[v6,2/8] mtd: rawnand: rockchip: NFC drivers for RK3308, RK2928 and others

Commit Message

Yifeng Zhao June 9, 2020, 7:40 a.m. UTC

This driver supports Rockchip NFC (NAND Flash Controller) found on RK3308,
RK2928, RKPX30, RV1108 and other SOCs. The driver has been tested using
8-bit NAND interface on the ARM based RK3308 platform.

Support Rockchip SoCs and NFC versions:
- PX30 and RK3326(NFCv900).
	ECC: 16/40/60/70 bits/1KB.
	CLOCK: ahb and nfc.
- RK3308 and RV1108(NFCv800).
	ECC: 16 bits/1KB.
	CLOCK: ahb and nfc.
- RK3036 and RK3128(NFCv622).
	ECC: 16/24/40/60 bits/1KB.
	CLOCK: ahb and nfc.
- RK3066, RK3188 and RK2928(NFCv600).
	ECC: 16/24/40/60 bits/1KB.
	CLOCK: ahb.

Support feature:
- Read full page data by DMA.
- Support HW ECC(one step is 1KB).
- Support 2 - 32K page size.
- Support 4 CS(depend on Soc)

Limitations:
- Unsupport 512B ecc step.
- Raw page read and write without ecc redundancy code. So could not support
  raw data dump and restore.
- Untested on some SOCs.
- Unsupport subpage.
- Unsupport randomizer.
- The original bad block mask is not supported. It is recommended to use
  the BBT(bad block table).

Signed-off-by: Yifeng Zhao <[e-mail]>
---

Changes in v6:
- The mtd->name set by NAND label property.
- Add some comments.
- Fix compile error.

Changes in v5:
- Add boot blocks support  with different ecc for bootrom.
- Rename rockchip-nand.c to rockchip-nand-controller.c.
- Unification of other variable names.
- Remove some compatible define.

Changes in v4:
- Define platform data structure for the register offsets.
- The compatible define with rkxx_nfc.
- Use SET_SYSTEM_SLEEP_PM_OPS to define PM_OPS.
- Use exec_op instead of legacy hooks.

Changes in v3: None
Changes in v2:
- Fix compile error.
- Include header files sorted by file name.

 drivers/mtd/nand/raw/Kconfig                  |   21 +
 drivers/mtd/nand/raw/Makefile                 |    1 +
 .../mtd/nand/raw/rockchip-nand-controller.c   | 1393 +++++++++++++++++
 3 files changed, 1415 insertions(+)
 create mode 100644 drivers/mtd/nand/raw/rockchip-nand-controller.c

Comments

kernel test robot June 9, 2020, 9:23 a.m. UTC | #1

Hi Yifeng,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on rockchip/for-next]
[also build test WARNING on robh/for-next linus/master v5.7]
[cannot apply to next-20200608]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Yifeng-Zhao/Add-Rockchip-NFC-drivers-for-RK3308-and-others/20200609-155150
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip.git for-next
config: parisc-allyesconfig (attached as .config)
compiler: hppa-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[e-mail]>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

In file included from include/linux/mm.h:95,
from include/linux/scatterlist.h:8,
from include/linux/dma-mapping.h:11,
from drivers/mtd/nand/raw/rockchip-nand-controller.c:10:
include/asm-generic/pgtable.h: In function 'pte_clear_not_present_full':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 |   pte_t old_pte;              |         ^~~~~~~
arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at'
322 | #define pte_clear(mm, addr, xp)  set_pte_at(mm, addr, xp, __pte(0))
|                                  ^~~~~~~~~~
include/asm-generic/pgtable.h:202:2: note: in expansion of macro 'pte_clear'
202 |  pte_clear(mm, address, ptep);
|  ^~~~~~~~~
include/asm-generic/pgtable.h: In function '__ptep_modify_prot_commit':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 |   pte_t old_pte;              |         ^~~~~~~
include/asm-generic/pgtable.h:641:2: note: in expansion of macro 'set_pte_at'
641 |  set_pte_at(vma->vm_mm, addr, ptep, pte);
|  ^~~~~~~~~~
drivers/mtd/nand/raw/rockchip-nand-controller.c: At top level:
>> drivers/mtd/nand/raw/rockchip-nand-controller.c:1180:18: warning: initialized field overwritten [-Woverride-init]
1180 |   .bch_st_off  = 0x20,
|                  ^~~~
drivers/mtd/nand/raw/rockchip-nand-controller.c:1180:18: note: (near initialization for 'nfc_v8_cfg.bch_st_off')

vim +1180 drivers/mtd/nand/raw/rockchip-nand-controller.c

  1166	
  1167	static struct nfc_cfg nfc_v8_cfg = {
  1168			.type			= NFC_V8,
  1169			.ecc_strengths		= {16, 16, 16, 16},
  1170			.ecc_cfgs		= {
  1171				0x00000001, 0x00000001, 0x00000001, 0x00000001,
  1172			},
  1173			.flctl_off		= 0x08,
  1174			.bchctl_off		= 0x0C,
  1175			.dma_cfg_off		= 0x10,
  1176			.dma_data_buf_off	= 0x14,
  1177			.dma_oob_buf_off	= 0x18,
  1178			.dma_st_off		= 0x1C,
  1179			.bch_st_off		= 0x20,
> 1180			.bch_st_off		= 0x20,
  1181			.randmz_off		= 0x150,
  1182			.int_en_off		= 0x16C,
  1183			.int_clr_off		= 0x170,
  1184			.int_st_off		= 0x174,
  1185			.oob0_off		= 0x200,
  1186			.oob1_off		= 0x230,
  1187			.ecc0			= {
  1188				.err_flag_bit	= 2,
  1189				.low		= 3,
  1190				.low_mask	= 0x1F,
  1191				.low_bn		= 5,
  1192				.high		= 27,
  1193				.high_mask	= 0x1,
  1194			},
  1195			.ecc1			= {
  1196				.err_flag_bit	= 15,
  1197				.low		= 16,
  1198				.low_mask	= 0x1F,
  1199				.low_bn		= 5,
  1200				.high		= 29,
  1201				.high_mask	= 0x1,
  1202			},
  1203	};
  1204	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[e-mail]

kernel test robot June 9, 2020, 2:48 p.m. UTC | #2

Hi Yifeng,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on rockchip/for-next]
[also build test WARNING on robh/for-next linus/master v5.7]
[cannot apply to next-20200608]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Yifeng-Zhao/Add-Rockchip-NFC-drivers-for-RK3308-and-others/20200609-155150
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip.git for-next
config: x86_64-allyesconfig (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project bc2b70982be8f5250cd0082a7190f8b417bd4dfe)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[e-mail]>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> drivers/mtd/nand/raw/rockchip-nand-controller.c:1180:18: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
.bch_st_off             = 0x20,
^~~~
drivers/mtd/nand/raw/rockchip-nand-controller.c:1179:18: note: previous initialization is here
.bch_st_off             = 0x20,
^~~~
1 warning generated.

vim +1180 drivers/mtd/nand/raw/rockchip-nand-controller.c

  1166	
  1167	static struct nfc_cfg nfc_v8_cfg = {
  1168			.type			= NFC_V8,
  1169			.ecc_strengths		= {16, 16, 16, 16},
  1170			.ecc_cfgs		= {
  1171				0x00000001, 0x00000001, 0x00000001, 0x00000001,
  1172			},
  1173			.flctl_off		= 0x08,
  1174			.bchctl_off		= 0x0C,
  1175			.dma_cfg_off		= 0x10,
  1176			.dma_data_buf_off	= 0x14,
  1177			.dma_oob_buf_off	= 0x18,
  1178			.dma_st_off		= 0x1C,
  1179			.bch_st_off		= 0x20,
> 1180			.bch_st_off		= 0x20,
  1181			.randmz_off		= 0x150,
  1182			.int_en_off		= 0x16C,
  1183			.int_clr_off		= 0x170,
  1184			.int_st_off		= 0x174,
  1185			.oob0_off		= 0x200,
  1186			.oob1_off		= 0x230,
  1187			.ecc0			= {
  1188				.err_flag_bit	= 2,
  1189				.low		= 3,
  1190				.low_mask	= 0x1F,
  1191				.low_bn		= 5,
  1192				.high		= 27,
  1193				.high_mask	= 0x1,
  1194			},
  1195			.ecc1			= {
  1196				.err_flag_bit	= 15,
  1197				.low		= 16,
  1198				.low_mask	= 0x1F,
  1199				.low_bn		= 5,
  1200				.high		= 29,
  1201				.high_mask	= 0x1,
  1202			},
  1203	};
  1204	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[e-mail]

Johan Jonker June 9, 2020, 4:10 p.m. UTC | #3

Hi Yifeng,

Just a few comments (part1).

This patch doesn't apply without errors.
Use linux-next as base.

git clone --depth 1
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
linux-next

Before submitting use this script and fix all the warnings where possible.

./scripts/checkpatch.pl --strict

Use a spelling checker.

Code review is up to the MTD maintainers.

Kind regards,

Johan

On 6/9/20 9:40 AM, Yifeng Zhao wrote:
> This driver supports Rockchip NFC (NAND Flash Controller) found on RK3308,
> RK2928, RKPX30, RV1108 and other SOCs. The driver has been tested using
> 8-bit NAND interface on the ARM based RK3308 platform.
> 
> Support Rockchip SoCs and NFC versions:
> - PX30 and RK3326(NFCv900).
> 	ECC: 16/40/60/70 bits/1KB.
> 	CLOCK: ahb and nfc.
> - RK3308 and RV1108(NFCv800).
> 	ECC: 16 bits/1KB.
> 	CLOCK: ahb and nfc.
> - RK3036 and RK3128(NFCv622).
> 	ECC: 16/24/40/60 bits/1KB.
> 	CLOCK: ahb and nfc.
> - RK3066, RK3188 and RK2928(NFCv600).
> 	ECC: 16/24/40/60 bits/1KB.
> 	CLOCK: ahb.
> 

> Support feature:

Supported features:

> - Read full page data by DMA.
> - Support HW ECC(one step is 1KB).
> - Support 2 - 32K page size.
> - Support 4 CS(depend on Soc)

up to 8 now in v6

> 
> Limitations:
> - Unsupport 512B ecc step.

No support for 512B ecc steps?
Or did you mean 512B block size?

> - Raw page read and write without ecc redundancy code. So could not support

Use one form of ECC abbreviation and use that consistant.

>   raw data dump and restore.

So no support for raw data dump and restore.

> - Untested on some SOCs.

SoCs

> - Unsupport subpage.

No support for subpages.

> - Unsupport randomizer.

No support for the builtin randomizer.

> - The original bad block mask is not supported. It is recommended to use
>   the BBT(bad block table).
> 
> Signed-off-by: Yifeng Zhao <[e-mail]>
> ---
> 
> Changes in v6:
> - The mtd->name set by NAND label property.
> - Add some comments.
> - Fix compile error.
> 
> Changes in v5:
> - Add boot blocks support  with different ecc for bootrom.

ECC
boot ROM

> - Rename rockchip-nand.c to rockchip-nand-controller.c.
> - Unification of other variable names.
> - Remove some compatible define.
> 
> Changes in v4:
> - Define platform data structure for the register offsets.
> - The compatible define with rkxx_nfc.
> - Use SET_SYSTEM_SLEEP_PM_OPS to define PM_OPS.
> - Use exec_op instead of legacy hooks.
> 
> Changes in v3: None
> Changes in v2:
> - Fix compile error.
> - Include header files sorted by file name.
> 
>  drivers/mtd/nand/raw/Kconfig                  |   21 +
>  drivers/mtd/nand/raw/Makefile                 |    1 +
>  .../mtd/nand/raw/rockchip-nand-controller.c   | 1393 +++++++++++++++++
>  3 files changed, 1415 insertions(+)
>  create mode 100644 drivers/mtd/nand/raw/rockchip-nand-controller.c
> 
> diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
> index a80a46bb5b8b..59e6e2a48ab9 100644
> --- a/drivers/mtd/nand/raw/Kconfig
> +++ b/drivers/mtd/nand/raw/Kconfig
> @@ -433,6 +433,27 @@ config MTD_NAND_MESON
>  	  Enables support for NAND controller on Amlogic's Meson SoCs.
>  	  This controller is found on Meson SoCs.
>  

> +config MTD_NAND_ROCKCHIP

New entries go after the last one added.
Insert config MTD_NAND_ROCKCHIP after config MTD_NAND_ARASAN

> +	tristate "Rockchip NAND controller"
> +	depends on ARCH_ROCKCHIP || COMPILE_TEST
> +	depends on HAS_IOMEM
> +	help
> +	  Enables support for NAND controller on Rockchip SoCs.

> +	  There are four different versions of NAND FLASH Controllers,
> +	  including:
> +	  - PX30 and RK3326(NFCv900).
> +		ECC: 16/40/60/70 bits/1KB.
> +		CLOCK: ahb and nfc.
> +	  - RK3308 and RV1108(NFCv800).
> +		ECC: 16 bits/1KB.
> +		CLOCK: ahb and nfc.
> +	  - RK3036 and RK3128(NFCv622).
> +		ECC: 16/24/40/60 bits/1KB.
> +		CLOCK: ahb and nfc.
> +	  - RK3066, RK3188 and RK2928(NFCv600).
> +		ECC: 16/24/40/60 bits/1KB.
> +		CLOCK: ahb.
> +
Just add a list with version and SoC name only.
Don't start with '-'.
Use alphabetical order, so later more SoCs can be easier inserted like
RK3288.

         NFC v600: RK2928, RK3066, RK3188
         NFC v622: RK3036, RK3128
         NFC v800: RK3308, RV1108
         NFC v900: PX30, RK3326

>  config MTD_NAND_GPIO
>  	tristate "GPIO assisted NAND controller"
>  	depends on GPIOLIB || COMPILE_TEST
> diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile
> index 2d136b158fb7..a54aa85f49b1 100644
> --- a/drivers/mtd/nand/raw/Makefile
> +++ b/drivers/mtd/nand/raw/Makefile
> @@ -58,6 +58,7 @@ obj-$(CONFIG_MTD_NAND_TEGRA)		+= tegra_nand.o
>  obj-$(CONFIG_MTD_NAND_STM32_FMC2)	+= stm32_fmc2_nand.o
>  obj-$(CONFIG_MTD_NAND_MESON)		+= meson_nand.o
>  obj-$(CONFIG_MTD_NAND_CADENCE)		+= cadence-nand-controller.o

obj-$(CONFIG_MTD_NAND_ARASAN)		+= arasan-nand-controller.o

New entries go after the last one added.
Use linux-next.

> +obj-$(CONFIG_MTD_NAND_ROCKCHIP)		+= rockchip-nand-controller.o
>  
>  nand-objs := nand_base.o nand_legacy.o nand_bbt.o nand_timings.o nand_ids.o
>  nand-objs += nand_onfi.o
> diff --git a/drivers/mtd/nand/raw/rockchip-nand-controller.c b/drivers/mtd/nand/raw/rockchip-nand-controller.c
> new file mode 100644
> index 000000000000..3d6cbca3565a
> --- /dev/null
> +++ b/drivers/mtd/nand/raw/rockchip-nand-controller.c
> @@ -0,0 +1,1393 @@
> +// SPDX-License-Identifier: GPL-2.0 OR MIT
> +/*
> + * Rockchip NAND Flash controller driver.
> + * Copyright (C) 2020 Rockchip Inc.
> + * Author: Yifeng Zhao <[e-mail]>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/dmaengine.h>
> +#include <linux/interrupt.h>
> +#include <linux/iopoll.h>
> +#include <linux/module.h>
> +#include <linux/mtd/mtd.h>
> +#include <linux/mtd/rawnand.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +
> +/*
> + * NFC Page Data Layout:
> + *	1024 Bytes Data + 4Bytes sys data + 28Bytes~124Bytes ecc +
> + *	1024 Bytes Data + 4Bytes sys data + 28Bytes~124Bytes ecc +
> + *	......
> + * NAND Page Data Layout:
> + *	1024 * n Data + m Bytes oob
> + * Original Bad Block Mask Location:
> + *	First byte of oob(spare).
> + * nand_chip->oob_poi data layout:
> + *	4Bytes sys data + .... + 4Bytes sys data + ecc data.
> + */
> +
> +/* NAND controller register definition */
> +#define	NFC_READ		(0)
> +#define	NFC_WRITE		(1)
> +#define	NFC_FMCTL		(0x00)
> +#define		FMCTL_CE_SEL_M		0xFF
> +#define		FMCTL_CE_SEL(x)		(1 << (x))
> +#define		FMCTL_WP		BIT(8)
> +#define		FMCTL_RDY		BIT(9)
> +#define	NFC_FMWAIT		(0x04)
> +#define		FLCTL_RST		BIT(0)
> +#define		FLCTL_WR		(1)	/* 0: read, 1: write */
> +#define		FLCTL_XFER_ST		BIT(2)
> +#define		FLCTL_XFER_EN		BIT(3)
> +#define		FLCTL_ACORRECT		BIT(10) /* Auto correct error bits. */
> +#define		FLCTL_XFER_READY	BIT(20)
> +#define		FLCTL_XFER_SECTOR	(22)
> +#define		FLCTL_TOG_FIX		BIT(29)
> +#define		BCHCTL_BANK_M	(7 << 5)
> +#define		BCHCTL_BANK	(5)
> +#define		DMA_ST			BIT(0)
> +#define		DMA_WR			(1)	/* 0: write, 1: read */
> +#define		DMA_EN			BIT(2)
> +#define		DMA_AHB_SIZE		(3)	/* 0: 1, 1: 2, 2: 4 */
> +#define		DMA_BURST_SIZE		(6)	/* 0: 1, 3: 4, 5: 8, 7: 16 */
> +#define		DMA_INC_NUM		(9)	/* 1 - 16 */
> +#define		ECC_ERR_CNT(x, e) ((((x) >> (e).low) & (e).low_mask) \
> +			| (((x) >> (e).high) & (e).high_mask) << (e).low_bn)
> +#define		INT_DMA			BIT(0)
> +#define	NFC_BANK		(0x800)
> +#define	NFC_BANK_STEP		(0x100)
> +#define		BANK_DATA		(0x00)
> +#define		BANK_ADDR		(0x04)
> +#define		BANK_CMD		(0x08)
> +#define	NFC_SRAM0		(0x1000)
> +#define	NFC_SRAM1		(0x1400)
> +#define	NFC_SRAM_SIZE		(0x400)
> +#define	NFC_TIMEOUT		(500000)
> +#define	NFC_MAX_OOB_PER_STEP	128
> +#define	NFC_MIN_OOB_PER_STEP	64
> +#define	MAX_DATA_SIZE		0xFFFC
> +#define	MAX_ADDRESS_CYC		6
> +#define	NFC_ECC_MAX_MODES	4
> +#define	NFC_MAX_NSELS		(8) /* Some Socs only have 1 or 2 CSs. */
> +#define	NFC_SYS_DATA_SIZE	(4) /* 4 bytes sys data in oob pre 1024 data.*/
> +#define	RK_DEFAULT_CLOCK_RATE	(150 * 1000 * 1000) /* 150 Mhz */
> +#define	ACCTIMING(csrw, rwpw, rwcs) ((csrw) << 12 | (rwpw) << 5 | (rwcs))
> +
> +enum nfc_type {
> +	NFC_V6,
> +	NFC_V8,
> +	NFC_V9,
> +};
> +
> +/**
> + * struct rk_ecc_cnt_status: represent a ecc status data.
> + * @err_flag_bit: error flag bit index at register.
> + * @low: ecc count low bit index at register.
> + * @low_mask: mask bit.
> + * @low_bn: ecc count low bit number.
> + * @high: ecc count high bit index at register.
> + * @high_mask: mask bit
> + */
> +struct ecc_cnt_status {
> +	u8 err_flag_bit;
> +	u8 low;
> +	u8 low_mask;
> +	u8 low_bn;
> +	u8 high;
> +	u8 high_mask;
> +};
> +
> +/**
> + * @type: nfc version
> + * @ecc_strengths: ecc strengths
> + * @ecc_cfgs: ecc config values
> + * @flctl_off: FLCTL register offset
> + * @bchctl_off: BCHCTL register offset
> + * @dma_data_buf_off: DMA_DATA_BUF register offset
> + * @dma_oob_buf_off: DMA_OOB_BUF register offset
> + * @dma_cfg_off: DMA_CFG register offset
> + * @dma_st_off: DMA_ST register offset
> + * @bch_st_off: BCG_ST register offset
> + * @randmz_off: RANDMZ register offset
> + * @int_en_off: interrupt enable register offset
> + * @int_clr_off: interrupt clean register offset
> + * @int_st_off: interrupt status register offset
> + * @oob0_off: oob0 register offset
> + * @oob1_off: oob1 register offset
> + * @ecc0: represent ECC0 status data
> + * @ecc1: represent ECC1 status data
> + */
> +struct nfc_cfg {
> +	enum nfc_type type;
> +	u8 ecc_strengths[NFC_ECC_MAX_MODES];
> +	u32 ecc_cfgs[NFC_ECC_MAX_MODES];
> +	u32 flctl_off;
> +	u32 bchctl_off;
> +	u32 dma_cfg_off;
> +	u32 dma_data_buf_off;
> +	u32 dma_oob_buf_off;
> +	u32 dma_st_off;
> +	u32 bch_st_off;
> +	u32 randmz_off;
> +	u32 int_en_off;
> +	u32 int_clr_off;
> +	u32 int_st_off;
> +	u32 oob0_off;
> +	u32 oob1_off;
> +	struct ecc_cnt_status ecc0;
> +	struct ecc_cnt_status ecc1;
> +};
> +
> +struct rk_nfc_nand_chip {
> +	struct list_head node;
> +	struct nand_chip chip;
> +
> +	u32 spare_per_sector;
> +	u32 oob_buf_per_sector;
> +	u32 boot_blks;
> +	u32 boot_ecc;
> +
> +	int nsels;
> +	u8 sels[0];
> +	/* Nothing after this field. */
> +};
> +
> +struct rk_nfc_clk {
> +	int nfc_rate;
> +	struct clk *nfc_clk;
> +	struct clk *ahb_clk;
> +};
> +
> +struct rk_nfc {
> +	struct nand_controller controller;
> +	struct rk_nfc_clk clk;
> +
> +	struct device *dev;
> +	const struct nfc_cfg *cfg;
> +	void __iomem *regs;
> +
> +	int selected_bank;
> +	int band_offset;
> +
> +	struct completion done;
> +	struct list_head chips;
> +
> +	u8 *buffer;
> +	u8 *page_buf;
> +	u32 *oob_buf;
> +
> +	unsigned long assigned_cs;
> +};
> +
> +static inline struct rk_nfc_nand_chip *to_rk_nand(struct nand_chip *chip)
> +{
> +	return container_of(chip, struct rk_nfc_nand_chip, chip);
> +}
> +
> +static inline u8 *data_ptr(struct nand_chip *chip, const u8 *p, int i)
> +{
> +	return (u8 *)p + i * chip->ecc.size;
> +}
> +
> +static inline u8 *oob_ptr(struct nand_chip *chip, int i)
> +{
> +	u8 *poi;
> +
> +	poi = chip->oob_poi + i * NFC_SYS_DATA_SIZE;
> +
> +	return poi;
> +}
> +
> +static inline int rk_data_len(struct nand_chip *chip)
> +{
> +	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
> +
> +	return chip->ecc.size + rk_nand->spare_per_sector;
> +}
> +
> +static inline u8 *rk_data_ptr(struct nand_chip *chip,  int i)
> +{
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +
> +	return nfc->buffer + i * rk_data_len(chip);
> +}
> +
> +static inline u8 *rk_oob_ptr(struct nand_chip *chip, int i)
> +{
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +
> +	return nfc->buffer + i * rk_data_len(chip) + chip->ecc.size;
> +}
> +
> +static void rk_nfc_select_chip(struct nand_chip *chip, int cs)
> +{
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
> +	u32 val;
> +
> +	if (cs < 0) {
> +		nfc->selected_bank = -1;
> +		/* Deselect the currently selected target. */
> +		val = readl_relaxed(nfc->regs + NFC_FMCTL);
> +		val &= ~FMCTL_CE_SEL_M;
> +		writel(val, nfc->regs + NFC_FMCTL);
> +		return;
> +	}
> +
> +	nfc->selected_bank = rk_nand->sels[cs];
> +	nfc->band_offset = NFC_BANK + nfc->selected_bank * NFC_BANK_STEP;
> +
> +	val = readl_relaxed(nfc->regs + NFC_FMCTL);
> +	val &= ~FMCTL_CE_SEL_M;
> +	val |= FMCTL_CE_SEL(nfc->selected_bank);
> +
> +	writel(val, nfc->regs + NFC_FMCTL);
> +}
> +
> +static inline int rk_nfc_wait_ioready(struct rk_nfc *nfc)
> +{
> +	int rc;
> +	u32 val;
> +
> +	rc = readl_poll_timeout_atomic(nfc->regs + NFC_FMCTL, val,
> +				       val & FMCTL_RDY, 10, NFC_TIMEOUT);
> +
> +	return rc;
> +}
> +
> +static inline u8 rk_nfc_read_byte(struct nand_chip *chip)
> +{
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +
> +	return readb_relaxed(nfc->regs + nfc->band_offset + BANK_DATA);
> +}
> +
> +static void rk_nfc_read_buf(struct nand_chip *chip, u8 *buf, int len)
> +{
> +	int i;
> +
> +	for (i = 0; i < len; i++)
> +		buf[i] = rk_nfc_read_byte(chip);
> +}
> +
> +static void rk_nfc_write_byte(struct nand_chip *chip, u8 byte)
> +{
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +
> +	writeb(byte, nfc->regs + nfc->band_offset + BANK_DATA);
> +}
> +
> +static void rk_nfc_write_buf(struct nand_chip *chip, const u8 *buf, int len)
> +{
> +	int i;
> +
> +	for (i = 0; i < len; i++)
> +		rk_nfc_write_byte(chip, buf[i]);
> +}
> +
> +static int rk_nfc_cmd(struct nand_chip *chip,
> +		      const struct nand_subop *subop)
> +{
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +	unsigned int i, j, remaining, start;
> +	int reg_offset = nfc->band_offset;
> +	void __iomem *data_reg;
> +	u8 *inbuf = NULL;
> +	const u8 *outbuf;
> +	u32 cnt = 0;
> +	int ret = 0;

> +

> +

Too many empty lines.

> +	for (i = 0; i < subop->ninstrs; i++) {
> +		const struct nand_op_instr *instr = &subop->instrs[i];
> +
> +		switch (instr->type) {
> +		case NAND_OP_CMD_INSTR:
> +			writeb(instr->ctx.cmd.opcode,
> +			       nfc->regs + reg_offset + BANK_CMD);
> +			break;
> +
> +		case NAND_OP_ADDR_INSTR:
> +			remaining = nand_subop_get_num_addr_cyc(subop, i);
> +			start = nand_subop_get_addr_start_off(subop, i);
> +
> +			for (j = 0; j < 8 && j + start < remaining; j++)
> +				writeb(instr->ctx.addr.addrs[j + start],
> +				       nfc->regs + reg_offset + BANK_ADDR);
> +			break;
> +
> +		case NAND_OP_DATA_IN_INSTR:
> +		case NAND_OP_DATA_OUT_INSTR:
> +			start = nand_subop_get_data_start_off(subop, i);
> +			cnt = nand_subop_get_data_len(subop, i);
> +			data_reg = nfc->regs + nfc->band_offset + BANK_DATA;
> +
> +			if (instr->type == NAND_OP_DATA_OUT_INSTR) {
> +				outbuf = instr->ctx.data.buf.out + start;
> +				for (j = 0; j < cnt; j++)
> +					writeb(outbuf[j], data_reg);
> +			} else {
> +				inbuf = instr->ctx.data.buf.in + start;
> +				for (j = 0; j < cnt; j++)
> +					inbuf[j] = readb_relaxed(data_reg);
> +			}
> +			break;
> +
> +		case NAND_OP_WAITRDY_INSTR:
> +			if (rk_nfc_wait_ioready(nfc) < 0) {
> +				ret = -ETIMEDOUT;
> +				dev_err(nfc->dev, "IO not ready\n");
> +			}
> +			break;
> +		}
> +	}
> +
> +	return ret;
> +}
> +
> +static const struct nand_op_parser rk_nfc_op_parser = NAND_OP_PARSER(
> +	NAND_OP_PARSER_PATTERN(
> +		rk_nfc_cmd,
> +		NAND_OP_PARSER_PAT_CMD_ELEM(true),
> +		NAND_OP_PARSER_PAT_ADDR_ELEM(true, MAX_ADDRESS_CYC),
> +		NAND_OP_PARSER_PAT_CMD_ELEM(true),
> +		NAND_OP_PARSER_PAT_WAITRDY_ELEM(true),
> +		NAND_OP_PARSER_PAT_DATA_IN_ELEM(true, MAX_DATA_SIZE)),
> +	NAND_OP_PARSER_PATTERN(
> +		rk_nfc_cmd,
> +		NAND_OP_PARSER_PAT_CMD_ELEM(true),
> +		NAND_OP_PARSER_PAT_ADDR_ELEM(true, MAX_ADDRESS_CYC),
> +		NAND_OP_PARSER_PAT_DATA_OUT_ELEM(true, MAX_DATA_SIZE),
> +		NAND_OP_PARSER_PAT_CMD_ELEM(true),
> +		NAND_OP_PARSER_PAT_WAITRDY_ELEM(true)),
> +);
> +
> +static int rk_nfc_exec_op(struct nand_chip *chip,
> +			  const struct nand_operation *op,
> +			  bool check_only)
> +{
> +	rk_nfc_select_chip(chip, op->cs);
> +	return nand_op_parser_exec_op(chip, &rk_nfc_op_parser, op,
> +				      check_only);
> +}
> +
> +static int rk_nfc_setup_data_interface(struct nand_chip *chip, int csline,
> +				       const struct nand_data_interface *conf)
> +{
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +	const struct nand_sdr_timings *timings;
> +	u32 rate, tc2rw, trwpw, trw2c;
> +	u32 temp;
> +
> +	if (csline == NAND_DATA_IFACE_CHECK_ONLY)
> +		return 0;
> +

> +	/* Not onfi nand flash. */

Make a phrase with a verb.

> +	if (!chip->parameters.onfi)
> +		return 0;
> +
> +	timings = nand_get_sdr_timings(conf);
> +	if (IS_ERR(timings))

> +		return -ENOTSUPP;

WARNING: ENOTSUPP is not a SUSV4 error code, prefer EOPNOTSUPP

> +
> +	if (IS_ERR(nfc->clk.nfc_clk))
> +		rate = clk_get_rate(nfc->clk.ahb_clk);
> +	else
> +		rate = clk_get_rate(nfc->clk.nfc_clk);
> +
> +	/* Turn clock rate into KHz. */

kHz

> +	rate /= 1000;
> +
> +	tc2rw = 1;
> +	trw2c = 1;
> +
> +	trwpw = max(timings->tWC_min, timings->tRC_min) / 1000;
> +	trwpw = DIV_ROUND_UP(trwpw * rate, 1000000);
> +
> +	temp = timings->tREA_max / 1000;
> +	temp = DIV_ROUND_UP(temp * rate, 1000000);
> +
> +	if (trwpw < temp)
> +		trwpw = temp;
> +
> +	/*
> +	 * ACCON: access timing control register
> +	 * -------------------------------------
> +	 * 31:18: reserved
> +	 * 17:12: csrw, clock cycles from the falling edge of CSn to the
> +		 falling edge of RDn or WRn
> +	 * 11:11: reserved
> +	 * 10:05: rwpw, the width of RDn or WRn in processor clock cycles
> +	 * 04:00: rwcs, clock cycles from the rising edge of RDn or WRn to the
> +		 rising edge of CSn
> +	 */
> +	temp = ACCTIMING(tc2rw, trwpw, trw2c);
> +	writel(temp, nfc->regs + NFC_FMWAIT);
> +
> +	return 0;
> +}
> +
> +static int rk_nfc_hw_ecc_setup(struct nand_chip *chip,
> +			       struct nand_ecc_ctrl *ecc,
> +			       uint32_t strength)
> +{
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +	u32 reg, i;
> +
> +	for (i = 0; i < NFC_ECC_MAX_MODES; i++) {
> +		if (ecc->strength == nfc->cfg->ecc_strengths[i]) {
> +			reg = nfc->cfg->ecc_cfgs[i];
> +			break;
> +		}
> +	}
> +
> +	if (i >= NFC_ECC_MAX_MODES)
> +		return -EINVAL;
> +
> +	writel(reg, nfc->regs + nfc->cfg->bchctl_off);
> +
> +	return 0;
> +}
> +
> +static void rk_nfc_xfer_start(struct rk_nfc *nfc, u8 rw, u8 n_KB,
> +			      dma_addr_t dma_data, dma_addr_t dma_oob)
> +{
> +	u32 dma_reg, fl_reg, bch_reg;
> +
> +	dma_reg = DMA_ST | ((!rw) << DMA_WR)  | DMA_EN | (2 << DMA_AHB_SIZE) |
> +	      (7 << DMA_BURST_SIZE) | (16 << DMA_INC_NUM);
> +
> +	fl_reg = (rw << FLCTL_WR) | FLCTL_XFER_EN | FLCTL_ACORRECT |
> +		 (n_KB << FLCTL_XFER_SECTOR) | FLCTL_TOG_FIX;
> +
> +	if (nfc->cfg->type == NFC_V6 || nfc->cfg->type == NFC_V8) {
> +		bch_reg = readl_relaxed(nfc->regs + nfc->cfg->bchctl_off);
> +		bch_reg = (bch_reg & (~BCHCTL_BANK_M)) |
> +			  (nfc->selected_bank << BCHCTL_BANK);
> +		writel(bch_reg, nfc->regs + nfc->cfg->bchctl_off);
> +	}
> +
> +	writel(dma_reg, nfc->regs + nfc->cfg->dma_cfg_off);
> +	writel((u32)dma_data, nfc->regs + nfc->cfg->dma_data_buf_off);
> +	writel((u32)dma_oob, nfc->regs + nfc->cfg->dma_oob_buf_off);
> +	writel(fl_reg, nfc->regs + nfc->cfg->flctl_off);
> +	fl_reg |= FLCTL_XFER_ST;
> +	writel(fl_reg, nfc->regs + nfc->cfg->flctl_off);
> +}
> +
> +static int rk_nfc_wait_for_xfer_done(struct rk_nfc *nfc)
> +{
> +	void __iomem *ptr;
> +	int ret = 0;
> +	u32 reg;
> +
> +	ptr = nfc->regs + nfc->cfg->flctl_off;
> +
> +	ret = readl_poll_timeout_atomic(ptr, reg,
> +					reg & FLCTL_XFER_READY,
> +					10, NFC_TIMEOUT);
> +
> +	return ret;
> +}
> +
> +static int rk_nfc_write_page(struct mtd_info *mtd, struct nand_chip *chip,
> +			     const u8 *buf, int page, int raw)
> +{
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
> +	struct nand_ecc_ctrl *ecc = &chip->ecc;
> +	int oob_step = (ecc->bytes > 60) ? NFC_MAX_OOB_PER_STEP :
> +			NFC_MIN_OOB_PER_STEP;
> +	int pages_per_blk = mtd->erasesize / mtd->writesize;
> +	int ret = 0, i, boot_rom_mode = 0;
> +	dma_addr_t dma_data, dma_oob;
> +	u32 reg;
> +	u8 *oob;
> +
> +	nand_prog_page_begin_op(chip, page, 0, NULL, 0);
> +
> +	if (!raw) {
> +		memcpy(nfc->page_buf, buf, mtd->writesize);
> +		memset(nfc->oob_buf, 0xff, oob_step * ecc->steps);
> +

> +		/*
> +		 * The first 8(some devices are 4 or 16) blocks in use by

are in use by

> +		 * the boot ROM and the first 32 bits of oob need to link
> +		 * to the next page address in the same block.
> +		 * Config the ECC algorithm supported by the boot ROM.
> +		 */
> +		if (page < pages_per_blk * rk_nand->boot_blks &&
> +		    chip->options & NAND_IS_BOOT_MEDIUM) {
> +			boot_rom_mode = 1;
> +			if (rk_nand->boot_ecc != ecc->strength)
> +				rk_nfc_hw_ecc_setup(chip, ecc,
> +						    rk_nand->boot_ecc);
> +		}

Helper?

> +
> +		/*

> +		 * Swap the first oob with the seventh oob and bad block


Swap the first oob byte with the seventh oob byte.

> +		 * mask is saved at the seventh oob.

The bad block mask is stored at the seventh oob byte.

> +		 */
> +		swap(chip->oob_poi[0], chip->oob_poi[7]);
> +
> +		for (i = 0; i < ecc->steps; i++) {
> +			oob = chip->oob_poi + i * NFC_SYS_DATA_SIZE;
> +			reg = oob[0] | oob[1] << 8 | oob[2] << 16 |
> +			      oob[3] << 24;
> +			if (!i && boot_rom_mode)
> +				reg = (page & (pages_per_blk - 1)) * 4;
> +
> +			if (nfc->cfg->type == NFC_V6 ||
> +			    nfc->cfg->type == NFC_V8)
> +				nfc->oob_buf[i * oob_step / 4] = reg;
> +			else
> +				nfc->oob_buf[i] = reg;
> +		}
> +
> +		dma_data = dma_map_single(nfc->dev, (void *)nfc->page_buf,
> +					  mtd->writesize, DMA_TO_DEVICE);
> +		dma_oob = dma_map_single(nfc->dev, nfc->oob_buf,
> +					 ecc->steps * oob_step,
> +					 DMA_TO_DEVICE);
> +
> +		reinit_completion(&nfc->done);
> +		writel(INT_DMA, nfc->regs + nfc->cfg->int_en_off);
> +
> +		rk_nfc_xfer_start(nfc, NFC_WRITE, ecc->steps, dma_data,
> +				  dma_oob);
> +		ret = wait_for_completion_timeout(&nfc->done,
> +						  msecs_to_jiffies(100));
> +		if (!ret)
> +			dev_warn(nfc->dev, "write: wait dma done timeout.\n");
> +		/*
> +		 * Whether the DMA transfer is completed or not. The driver
> +		 * needs to check the NFC`s status register to see if the data
> +		 * transfer was completed.
> +		 */
> +		ret = rk_nfc_wait_for_xfer_done(nfc);
> +
> +		dma_unmap_single(nfc->dev, dma_data, mtd->writesize,
> +				 DMA_TO_DEVICE);
> +		dma_unmap_single(nfc->dev, dma_oob, ecc->steps * oob_step,
> +				 DMA_TO_DEVICE);
> +

> +		if (boot_rom_mode && rk_nand->boot_ecc != ecc->strength)
> +			rk_nfc_hw_ecc_setup(chip, ecc, ecc->strength);

Helper?

> +
> +		if (ret) {
> +			ret = -EIO;

> +			dev_err(nfc->dev,
> +				 "write: wait transfer done timeout.\n");

align

> +		}
> +	} else {
> +		rk_nfc_write_buf(chip, buf, mtd->writesize + + mtd->oobsize);
> +	}
> +
> +	if (ret)
> +		return ret;
> +
> +	ret = nand_prog_page_end_op(chip);
> +
> +	/* Deselect the currently selected target. */
> +	rk_nfc_select_chip(chip, -1);
> +
> +	return ret;
> +}
> +
> +static int rk_nfc_write_page_raw(struct nand_chip *chip, const u8 *buf,
> +				 int oob_on, int page)
> +{
> +	struct mtd_info *mtd = nand_to_mtd(chip);
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +	u32 i;
> +
> +	memset(nfc->buffer, 0xff, mtd->writesize + mtd->oobsize);
> +	swap(chip->oob_poi[0], chip->oob_poi[7]);
> +	for (i = 0; i < chip->ecc.steps; i++) {
> +		if (buf)
> +			memcpy(rk_data_ptr(chip, i), data_ptr(chip, buf, i),
> +			       chip->ecc.size);
> +
> +		memcpy(rk_oob_ptr(chip, i), oob_ptr(chip, i),
> +		       NFC_SYS_DATA_SIZE);
> +	}
> +
> +	return rk_nfc_write_page(mtd, chip, nfc->buffer, page, 1);
> +}
> +
> +static int rk_nfc_write_oob_std(struct nand_chip *chip, int page)
> +{
> +	return rk_nfc_write_page_raw(chip, NULL, 1, page);
> +}
> +
> +static int rk_nfc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
> +			    u32 data_offs, u32 readlen,
> +			    u8 *buf, int page, int raw)
> +{
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
> +	struct nand_ecc_ctrl *ecc = &chip->ecc;
> +	int oob_step = (ecc->bytes > 60) ? NFC_MAX_OOB_PER_STEP :
> +			NFC_MIN_OOB_PER_STEP;
> +	int pages_per_blk = mtd->erasesize / mtd->writesize;
> +	dma_addr_t dma_data, dma_oob;
> +	int ret = 0, i, boot_rom_mode = 0;
> +	int bitflips = 0, bch_st;
> +	u8 *oob;
> +	u32 tmp;
> +
> +	nand_read_page_op(chip, page, 0, NULL, 0);
> +	if (!raw) {
> +		dma_data = dma_map_single(nfc->dev, nfc->page_buf,
> +					  mtd->writesize,
> +					  DMA_FROM_DEVICE);
> +		dma_oob = dma_map_single(nfc->dev, nfc->oob_buf,
> +					 ecc->steps * oob_step,
> +					 DMA_FROM_DEVICE);
> +

> +		/*
> +		 * The first 8(some devices are 4 or 16) blocks in use by

are in use by

> +		 * the bootrom.

boot ROM

> +		 * Config the ECC algorithm supported by the boot ROM.
> +		 */
> +		if (page < pages_per_blk * rk_nand->boot_blks &&
> +		    chip->options & NAND_IS_BOOT_MEDIUM) {
> +			boot_rom_mode = 1;
> +			if (rk_nand->boot_ecc != ecc->strength)
> +				rk_nfc_hw_ecc_setup(chip, ecc,
> +						    rk_nand->boot_ecc);
> +		}

Helper?

> +
> +		reinit_completion(&nfc->done);
> +		writel(INT_DMA, nfc->regs + nfc->cfg->int_en_off);
> +		rk_nfc_xfer_start(nfc, NFC_READ, ecc->steps, dma_data,
> +				  dma_oob);
> +		ret = wait_for_completion_timeout(&nfc->done,
> +						  msecs_to_jiffies(100));
> +		if (!ret)
> +			dev_warn(nfc->dev, "read: wait dma done timeout.\n");
> +		/*
> +		 * Whether the DMA transfer is completed or not. The driver
> +		 * needs to check the NFC`s status register to see if the data
> +		 * transfer was completed.
> +		 */
> +		ret = rk_nfc_wait_for_xfer_done(nfc);
> +		dma_unmap_single(nfc->dev, dma_data, mtd->writesize,
> +				 DMA_FROM_DEVICE);
> +		dma_unmap_single(nfc->dev, dma_oob, ecc->steps * oob_step,
> +				 DMA_FROM_DEVICE);
> +
> +		if (ret) {
> +			bitflips = -EIO;

> +			dev_err(nfc->dev,
> +				 "read: wait transfer done timeout.\n");

align

> +			goto out;
> +		}
> +
> +		for (i = 0; i < ecc->steps; i++) {
> +			oob = chip->oob_poi + i * NFC_SYS_DATA_SIZE;
> +			if (nfc->cfg->type == NFC_V6 ||
> +			    nfc->cfg->type == NFC_V8)
> +				tmp = nfc->oob_buf[i * oob_step / 4];
> +			else
> +				tmp = nfc->oob_buf[i];
> +			*oob++ = (u8)tmp;
> +			*oob++ = (u8)(tmp >> 8);
> +			*oob++ = (u8)(tmp >> 16);
> +			*oob++ = (u8)(tmp >> 24);
> +		}
> +
> +		/*
> +		 * Swap the first oob with the seventh oob and bad block

Swap the first oob byte with the seventh oob byte.

> +		 * mask is saved at the seventh oob.

The bad block mask is stored at the seventh oob byte.

> +		 */
> +		swap(chip->oob_poi[0], chip->oob_poi[7]);
> +
> +		for (i = 0; i < ecc->steps / 2; i++) {
> +			bch_st = readl_relaxed(nfc->regs +
> +					       nfc->cfg->bch_st_off + i * 4);
> +			if (bch_st & BIT(nfc->cfg->ecc0.err_flag_bit) ||
> +			    bch_st & BIT(nfc->cfg->ecc1.err_flag_bit)) {
> +				mtd->ecc_stats.failed++;
> +				bitflips = -1;
> +			} else {
> +				ret = ECC_ERR_CNT(bch_st, nfc->cfg->ecc0);
> +				mtd->ecc_stats.corrected += ret;
> +				bitflips = max_t(u32, bitflips, ret);
> +
> +				ret = ECC_ERR_CNT(bch_st, nfc->cfg->ecc1);
> +				mtd->ecc_stats.corrected += ret;
> +				bitflips = max_t(u32, bitflips, ret);
> +			}
> +		}
> +out:
> +		memcpy(buf, nfc->page_buf, mtd->writesize);
> +

> +		if (boot_rom_mode && rk_nand->boot_ecc != ecc->strength)
> +			rk_nfc_hw_ecc_setup(chip, ecc, ecc->strength);

Helper?

> +
> +		if (bitflips < 0)
> +			dev_err(nfc->dev, "read page: %x ecc error!\n", page);
> +	} else {
> +		rk_nfc_read_buf(chip, buf, mtd->writesize + mtd->oobsize);
> +	}
> +	/* Deselect the currently selected target. */
> +	rk_nfc_select_chip(chip, -1);
> +
> +	return bitflips;
> +}
> +
> +static int rk_nfc_write_page_hwecc(struct nand_chip *chip, const u8 *buf,
> +				   int oob_on, int page)
> +{
> +	return rk_nfc_write_page(nand_to_mtd(chip), chip, buf, page, 0);
> +}
> +
> +static int rk_nfc_read_page_hwecc(struct nand_chip *chip, u8 *p, int oob_on,
> +				  int pg)
> +{
> +	struct mtd_info *mtd = nand_to_mtd(chip);
> +
> +	return rk_nfc_read_page(mtd, chip, 0, mtd->writesize, p, pg, 0);
> +}
> +
> +static int rk_nfc_read_page_raw(struct nand_chip *chip, u8 *buf, int oob_on,
> +				int page)
> +{
> +	struct mtd_info *mtd = nand_to_mtd(chip);
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +	int i, ret;
> +
> +	ret = rk_nfc_read_page(mtd, chip, 0, mtd->writesize, nfc->buffer,
> +			       page, 1);
> +	if (ret < 0)
> +		return ret;
> +
> +	for (i = 0; i < chip->ecc.steps; i++) {
> +		memcpy(oob_ptr(chip, i), rk_oob_ptr(chip, i),
> +		       NFC_SYS_DATA_SIZE);
> +
> +		if (buf)
> +			memcpy(data_ptr(chip, buf, i), rk_data_ptr(chip, i),
> +			       chip->ecc.size);
> +	}
> +	swap(chip->oob_poi[0], chip->oob_poi[7]);
> +
> +	return ret;
> +}
> +
> +static int rk_nfc_read_oob_std(struct nand_chip *chip, int page)
> +{
> +	return rk_nfc_read_page_raw(chip, NULL, 1, page);
> +}
> +
> +static inline void rk_nfc_hw_init(struct rk_nfc *nfc)
> +{
> +	/* Disable flash wp. */
> +	writel(FMCTL_WP, nfc->regs + NFC_FMCTL);
> +	/* Config default timing 40ns at 150 Mhz nfc clock. */
> +	writel(0x1081, nfc->regs + NFC_FMWAIT);
> +	/* Disable randomizer and DMA. */
> +	writel(0, nfc->regs + nfc->cfg->randmz_off);
> +	writel(0, nfc->regs + nfc->cfg->dma_cfg_off);
> +	writel(FLCTL_RST, nfc->regs + nfc->cfg->flctl_off);
> +}
> +
> +static irqreturn_t rk_nfc_irq(int irq, void *id)
> +{
> +	struct rk_nfc *nfc = id;
> +	u32 sta, ien;
> +
> +	sta = readl_relaxed(nfc->regs + nfc->cfg->int_st_off);
> +	ien = readl_relaxed(nfc->regs + nfc->cfg->int_en_off);
> +
> +	if (!(sta & ien))
> +		return IRQ_NONE;
> +
> +	writel(sta, nfc->regs + nfc->cfg->int_clr_off);
> +	writel(~sta & ien, nfc->regs + nfc->cfg->int_en_off);
> +
> +	complete(&nfc->done);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int rk_nfc_enable_clk(struct device *dev, struct rk_nfc_clk *clk)
> +{
> +	int ret;
> +
> +	if (!IS_ERR(clk->nfc_clk)) {
> +		ret = clk_prepare_enable(clk->nfc_clk);
> +		if (ret) {
> +			dev_err(dev, "failed to enable nfc clk\n");
> +			return ret;
> +		}
> +	}
> +
> +	ret = clk_prepare_enable(clk->ahb_clk);
> +	if (ret) {
> +		dev_err(dev, "failed to enable ahb clk\n");
> +		if (!IS_ERR(clk->nfc_clk))
> +			clk_disable_unprepare(clk->nfc_clk);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static void rk_nfc_disable_clk(struct rk_nfc_clk *clk)
> +{
> +	if (!IS_ERR(clk->nfc_clk))
> +		clk_disable_unprepare(clk->nfc_clk);
> +	clk_disable_unprepare(clk->ahb_clk);
> +}
> +
> +static int rk_nfc_ooblayout_free(struct mtd_info *mtd, int section,
> +				 struct mtd_oob_region *oob_region)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +
> +	if (section >= chip->ecc.steps)
> +		return -ERANGE;
> +
> +	if (!section) {

> +		/* The first byte is bad block mask flag. */

/* The first byte is the bad block mask flag. */

> +		oob_region->length = NFC_SYS_DATA_SIZE - 1;
> +		oob_region->offset = 1;
> +	} else {
> +		oob_region->length = NFC_SYS_DATA_SIZE;
> +		oob_region->offset = section * NFC_SYS_DATA_SIZE;
> +	}
> +
> +	return 0;
> +}
> +
> +static int rk_nfc_ooblayout_ecc(struct mtd_info *mtd, int section,
> +				struct mtd_oob_region *oob_region)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +
> +	if (section)
> +		return -ERANGE;
> +
> +	oob_region->offset = NFC_SYS_DATA_SIZE * chip->ecc.steps;
> +	oob_region->length = mtd->oobsize - oob_region->offset;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops rk_nfc_ooblayout_ops = {
> +	.free = rk_nfc_ooblayout_free,
> +	.ecc = rk_nfc_ooblayout_ecc,
> +};
> +
> +static int rk_nfc_ecc_init(struct device *dev, struct mtd_info *mtd)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +	struct nand_ecc_ctrl *ecc = &chip->ecc;
> +	const u8 *strengths = nfc->cfg->ecc_strengths;
> +	u8 max_strength, nfc_max_strength;
> +	int i;
> +
> +	nfc_max_strength = nfc->cfg->ecc_strengths[0];
> +	/* If optional dt settings not present. */
> +	if (!ecc->size || !ecc->strength ||
> +	    ecc->strength > nfc_max_strength) {
> +		/* Use datasheet requirements. */
> +		ecc->strength = chip->base.eccreq.strength;
> +		ecc->size = chip->base.eccreq.step_size;
> +
> +		/*

> +		 * Align eccstrength and eccsize.

Align ECC strength and ECC size.

> +		 * This controller only supports 512 and 1024 sizes.

What are sizes? Did you mean pages or blocks ....Fix phrase.

> +		 */
> +		if (chip->ecc.size < 1024) {
> +			if (mtd->writesize > 512) {
> +				chip->ecc.size = 1024;
> +				chip->ecc.strength <<= 1;
> +			} else {
> +				dev_err(dev, "ecc.size not supported\n");
> +				return -EINVAL;
> +			}
> +		} else {
> +			chip->ecc.size = 1024;
> +		}
> +
> +		ecc->steps = mtd->writesize / ecc->size;
> +
> +		/*

> +		 * HW ECC always request ECC bytes for 1024 bytes blocks.

HW ECC always requests the number of ECC bytes per 1024 byte blocks.

> +		 * 4 Bytes is oob for sys data.
> +		 */
> +		max_strength = ((mtd->oobsize / ecc->steps) - 4) * 8 /
> +				 fls(8 * 1024);
> +		if (max_strength > nfc_max_strength)
> +			max_strength = nfc_max_strength;
> +
> +		for (i = 0; i < 4; i++) {
> +			if (max_strength >= strengths[i])
> +				break;
> +		}
> +
> +		if (i >= 4) {
> +			dev_err(nfc->dev, "unsupported strength\n");

> +			return -ENOTSUPP;

WARNING: ENOTSUPP is not a SUSV4 error code, prefer EOPNOTSUPP

> +		}
> +
> +		ecc->strength = strengths[i];
> +	}
> +	ecc->steps = mtd->writesize / ecc->size;
> +	ecc->bytes = DIV_ROUND_UP(ecc->strength * fls(8 * 1024), 8);
> +	/* HW ECC always work with even numbers of ECC bytes. */
> +	ecc->bytes = ALIGN(ecc->bytes, 2);
> +
> +	rk_nfc_hw_ecc_setup(chip, ecc, ecc->strength);
> +
> +	return 0;
> +}
> +
> +static int rk_nfc_attach_chip(struct nand_chip *chip)
> +{
> +	struct mtd_info *mtd = nand_to_mtd(chip);
> +	struct device *dev = mtd->dev.parent;
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
> +	struct nand_ecc_ctrl *ecc = &chip->ecc;
> +	int len;
> +	int ret;
> +
> +	if (chip->options & NAND_BUSWIDTH_16) {
> +		dev_err(dev, "16 bits bus width not supported");
> +		return -EINVAL;
> +	}
> +
> +	if (ecc->mode != NAND_ECC_HW)
> +		return 0;
> +
> +	ret = rk_nfc_ecc_init(dev, mtd);
> +	if (ret)
> +		return ret;
> +	rk_nand->spare_per_sector = ecc->bytes + NFC_SYS_DATA_SIZE;
> +
> +	/* Check buffer first, avoid duplicate alloc buffer. */
> +	if (nfc->buffer)
> +		return 0;
> +
> +	len = mtd->writesize + mtd->oobsize;
> +	nfc->buffer = devm_kzalloc(dev, len, GFP_KERNEL | GFP_DMA);
> +	if (!nfc->buffer)
> +		return -ENOMEM;
> +
> +	nfc->page_buf = nfc->buffer;
> +	len = ecc->steps * NFC_MAX_OOB_PER_STEP;
> +	nfc->oob_buf = devm_kzalloc(dev, len, GFP_KERNEL | GFP_DMA);
> +	if (!nfc->oob_buf) {
> +		devm_kfree(dev, nfc->buffer);
> +		nfc->buffer = NULL;
> +		nfc->oob_buf = NULL;
> +		return -ENOMEM;
> +	}
> +
> +	chip->ecc.write_page_raw = rk_nfc_write_page_raw;
> +	chip->ecc.write_page = rk_nfc_write_page_hwecc;
> +	chip->ecc.write_oob_raw = rk_nfc_write_oob_std;
> +	chip->ecc.write_oob = rk_nfc_write_oob_std;
> +
> +	chip->ecc.read_page_raw = rk_nfc_read_page_raw;
> +	chip->ecc.read_page = rk_nfc_read_page_hwecc;
> +	chip->ecc.read_oob_raw = rk_nfc_read_oob_std;
> +	chip->ecc.read_oob = rk_nfc_read_oob_std;
> +
> +	return 0;
> +}
> +
> +static const struct nand_controller_ops rk_nfc_controller_ops = {
> +	.attach_chip = rk_nfc_attach_chip,
> +	.exec_op = rk_nfc_exec_op,
> +	.setup_data_interface = rk_nfc_setup_data_interface,
> +};
> +
> +static int rk_nfc_nand_chip_init(struct device *dev, struct rk_nfc *nfc,
> +				 struct device_node *np)
> +{
> +	struct rk_nfc_nand_chip *nand;
> +	struct nand_chip *chip;
> +	struct mtd_info *mtd;
> +	int nsels;
> +	u32 tmp;
> +	int ret;
> +	int i;
> +
> +	if (!of_get_property(np, "reg", &nsels))
> +		return -ENODEV;
> +	nsels /= sizeof(u32);
> +	if (!nsels || nsels > NFC_MAX_NSELS) {
> +		dev_err(dev, "invalid reg property size %d\n", nsels);
> +		return -EINVAL;
> +	}
> +
> +	nand = devm_kzalloc(dev, sizeof(*nand) + nsels * sizeof(u8),
> +			    GFP_KERNEL);
> +	if (!nand)
> +		return -ENOMEM;
> +
> +	nand->nsels = nsels;
> +	for (i = 0; i < nsels; i++) {
> +		ret = of_property_read_u32_index(np, "reg", i, &tmp);
> +		if (ret) {
> +			dev_err(dev, "reg property failure : %d\n", ret);
> +			return ret;
> +		}
> +
> +		if (tmp >= NFC_MAX_NSELS) {
> +			dev_err(dev, "invalid CS: %u\n", tmp);
> +			return -EINVAL;
> +		}
> +
> +		if (test_and_set_bit(tmp, &nfc->assigned_cs)) {
> +			dev_err(dev, "CS %u already assigned\n", tmp);
> +			return -EINVAL;
> +		}
> +
> +		nand->sels[i] = tmp;
> +	}
> +
> +	chip = &nand->chip;
> +	chip->controller = &nfc->controller;
> +
> +	nand_set_flash_node(chip, np);
> +
> +	nand_set_controller_data(chip, nfc);
> +
> +	chip->options |= NAND_USE_BOUNCE_BUFFER | NAND_NO_SUBPAGE_WRITE;
> +	chip->bbt_options = NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;
> +
> +	/* Set default mode in case dt entry is missing. */
> +	chip->ecc.mode = NAND_ECC_HW;
> +
> +	mtd = nand_to_mtd(chip);
> +	mtd->owner = THIS_MODULE;
> +	mtd->dev.parent = dev;
> +
> +	if (!mtd->name) {
> +		dev_err(nfc->dev, "NAND label property is mandatory\n");
> +		return -EINVAL;
> +	}
> +
> +	mtd_set_ooblayout(mtd, &rk_nfc_ooblayout_ops);
> +	rk_nfc_hw_init(nfc);
> +	ret = nand_scan(chip, nsels);
> +	if (ret)
> +		return ret;
> +
> +	if (chip->options & NAND_IS_BOOT_MEDIUM) {
> +		ret = of_property_read_u32(np, "rockchip,boot-blks", &tmp);
> +		nand->boot_blks = ret ? 0 : tmp;
> +
> +		ret = of_property_read_u32(np, "rockchip,boot-ecc-strength",
> +					   &tmp);
> +		nand->boot_ecc = ret ? chip->ecc.strength : tmp;
> +	}
> +
> +	ret = mtd_device_register(mtd, NULL, 0);
> +	if (ret) {
> +		dev_err(dev, "mtd parse partition error\n");
> +		nand_release(chip);
> +		return ret;
> +	}
> +
> +	list_add_tail(&nand->node, &nfc->chips);
> +
> +	return 0;
> +}
> +
> +static int rk_nfc_nand_chips_init(struct device *dev, struct rk_nfc *nfc)
> +{
> +	struct device_node *np = dev->of_node;
> +	struct device_node *nand_np;
> +	int ret = -EINVAL;
> +	int tmp;
> +
> +	for_each_child_of_node(np, nand_np) {
> +		tmp = rk_nfc_nand_chip_init(dev, nfc, nand_np);
> +		if (tmp) {
> +			of_node_put(nand_np);
> +			return ret;
> +		}
> +		/* At least one nand chip is initialized. */
> +		ret = 0;
> +	}
> +
> +	return ret;
> +}
> +
> +static struct nfc_cfg nfc_v6_cfg = {
> +		.type			= NFC_V6,
> +		.ecc_strengths		= {60, 40, 24, 16},
> +		.ecc_cfgs		= {
> +			0x00040011, 0x00040001, 0x00000011, 0x00000001,
> +		},
> +		.flctl_off		= 0x08,
> +		.bchctl_off		= 0x0C,
> +		.dma_cfg_off		= 0x10,
> +		.dma_data_buf_off	= 0x14,
> +		.dma_oob_buf_off	= 0x18,
> +		.dma_st_off		= 0x1C,
> +		.bch_st_off		= 0x20,
> +		.randmz_off		= 0x150,
> +		.int_en_off		= 0x16C,
> +		.int_clr_off		= 0x170,
> +		.int_st_off		= 0x174,
> +		.oob0_off		= 0x200,
> +		.oob1_off		= 0x230,
> +		.ecc0			= {
> +			.err_flag_bit	= 2,
> +			.low		= 3,
> +			.low_mask	= 0x1F,
> +			.low_bn		= 5,
> +			.high		= 27,
> +			.high_mask	= 0x1,
> +		},
> +		.ecc1			= {
> +			.err_flag_bit	= 15,
> +			.low		= 16,
> +			.low_mask	= 0x1F,
> +			.low_bn		= 5,
> +			.high		= 29,
> +			.high_mask	= 0x1,
> +		},
> +};
> +
> +static struct nfc_cfg nfc_v8_cfg = {
> +		.type			= NFC_V8,
> +		.ecc_strengths		= {16, 16, 16, 16},
> +		.ecc_cfgs		= {
> +			0x00000001, 0x00000001, 0x00000001, 0x00000001,
> +		},
> +		.flctl_off		= 0x08,
> +		.bchctl_off		= 0x0C,
> +		.dma_cfg_off		= 0x10,
> +		.dma_data_buf_off	= 0x14,
> +		.dma_oob_buf_off	= 0x18,
> +		.dma_st_off		= 0x1C,

> +		.bch_st_off		= 0x20,
> +		.bch_st_off		= 0x20,

Too many bch_st_off.

> +		.randmz_off		= 0x150,
> +		.int_en_off		= 0x16C,
> +		.int_clr_off		= 0x170,
> +		.int_st_off		= 0x174,
> +		.oob0_off		= 0x200,
> +		.oob1_off		= 0x230,
> +		.ecc0			= {
> +			.err_flag_bit	= 2,
> +			.low		= 3,
> +			.low_mask	= 0x1F,
> +			.low_bn		= 5,
> +			.high		= 27,
> +			.high_mask	= 0x1,
> +		},
> +		.ecc1			= {
> +			.err_flag_bit	= 15,
> +			.low		= 16,
> +			.low_mask	= 0x1F,
> +			.low_bn		= 5,
> +			.high		= 29,
> +			.high_mask	= 0x1,
> +		},
> +};
> +
> +static struct nfc_cfg nfc_v9_cfg = {
> +		.type			= NFC_V9,
> +		.ecc_strengths		= {70, 60, 40, 16},
> +		.ecc_cfgs		= {
> +			0x00000001, 0x06000001, 0x04000001, 0x02000001,
> +		},
> +		.flctl_off		= 0x10,
> +		.bchctl_off		= 0x20,
> +		.dma_cfg_off		= 0x30,
> +		.dma_data_buf_off	= 0x34,
> +		.dma_oob_buf_off	= 0x38,
> +		.dma_st_off		= 0x3C,
> +		.bch_st_off		= 0x150,
> +		.randmz_off		= 0x208,
> +		.int_en_off		= 0x120,
> +		.int_clr_off		= 0x124,
> +		.int_st_off		= 0x128,
> +		.oob0_off		= 0x200,
> +		.oob1_off		= 0x204,
> +		.ecc0			= {
> +			.err_flag_bit	= 2,
> +			.low		= 3,
> +			.low_mask	= 0x7F,
> +			.low_bn		= 7,
> +			.high		= 0,
> +			.high_mask	= 0x0,
> +		},
> +		.ecc1			= {
> +			.err_flag_bit	= 18,
> +			.low		= 19,
> +			.low_mask	= 0x7F,
> +			.low_bn		= 7,
> +			.high		= 0,
> +			.high_mask	= 0x0,
> +		},
> +};
> +
> +static const struct of_device_id rk_nfc_id_table[] = {
> +	{.compatible = "rockchip,px30-nfc",
> +		.data = &nfc_v9_cfg },
> +	{.compatible = "rockchip,rk2928-nfc",
> +		.data = &nfc_v6_cfg },
> +	{.compatible = "rockchip,rv1108-nfc",
> +		.data = &nfc_v8_cfg },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, rk_nfc_id_table);
> +
> +static int rk_nfc_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct rk_nfc *nfc;
> +	struct resource *res;
> +	int ret, irq;
> +
> +	nfc = devm_kzalloc(dev, sizeof(*nfc), GFP_KERNEL);
> +	if (!nfc)
> +		return -ENOMEM;
> +
> +	nand_controller_init(&nfc->controller);
> +	INIT_LIST_HEAD(&nfc->chips);
> +	nfc->controller.ops = &rk_nfc_controller_ops;
> +
> +	nfc->cfg = of_device_get_match_data(dev);
> +	nfc->dev = dev;
> +
> +	init_completion(&nfc->done);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	nfc->regs = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(nfc->regs)) {
> +		ret = PTR_ERR(nfc->regs);
> +		goto release_nfc;
> +	}
> +
> +	nfc->clk.nfc_clk = devm_clk_get(dev, "nfc");
> +	if (IS_ERR(nfc->clk.nfc_clk)) {
> +		dev_dbg(dev, "no nfc clk\n");

> +		/* Some old device, sush as rk3066, has no nfc clk. */

/* Some earlier models, such as rk3066, have no nfc clk. */

> +	}
> +
> +	nfc->clk.ahb_clk = devm_clk_get(dev, "ahb");
> +	if (IS_ERR(nfc->clk.ahb_clk)) {
> +		dev_err(dev, "no ahb clk\n");
> +		ret = PTR_ERR(nfc->clk.ahb_clk);
> +		goto release_nfc;
> +	}
> +
> +	ret = rk_nfc_enable_clk(dev, &nfc->clk);
> +	if (ret)
> +		goto release_nfc;
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0) {
> +		dev_err(dev, "no nfc irq resource\n");
> +		ret = -EINVAL;
> +		goto clk_disable;
> +	}
> +
> +	writel(0, nfc->regs + nfc->cfg->int_en_off);
> +	ret = devm_request_irq(dev, irq, rk_nfc_irq, 0x0, "rk-nand", nfc);
> +	if (ret) {
> +		dev_err(dev, "failed to request nfc irq\n");
> +		goto clk_disable;
> +	}
> +
> +	platform_set_drvdata(pdev, nfc);
> +
> +	ret = rk_nfc_nand_chips_init(dev, nfc);
> +	if (ret) {
> +		dev_err(dev, "failed to init nand chips\n");
> +		goto clk_disable;
> +	}
> +	return 0;
> +
> +clk_disable:
> +	rk_nfc_disable_clk(&nfc->clk);
> +release_nfc:
> +	return ret;
> +}
> +
> +static int rk_nfc_remove(struct platform_device *pdev)
> +{
> +	struct rk_nfc *nfc = platform_get_drvdata(pdev);
> +	struct rk_nfc_nand_chip *nand;
> +
> +	while (!list_empty(&nfc->chips)) {
> +		nand = list_first_entry(&nfc->chips, struct rk_nfc_nand_chip,
> +					node);
> +		nand_release(&nand->chip);
> +		list_del(&nand->node);
> +	}
> +
> +	rk_nfc_disable_clk(&nfc->clk);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused rk_nfc_suspend(struct device *dev)
> +{
> +	struct rk_nfc *nfc = dev_get_drvdata(dev);
> +
> +	rk_nfc_disable_clk(&nfc->clk);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused rk_nfc_resume(struct device *dev)
> +{
> +	struct rk_nfc *nfc = dev_get_drvdata(dev);
> +	struct rk_nfc_nand_chip *nand;
> +	struct nand_chip *chip;
> +	int ret;
> +	u32 i;
> +
> +	ret = rk_nfc_enable_clk(dev, &nfc->clk);
> +	if (ret)
> +		return ret;
> +
> +	/* Reset NAND chip if VCC was powered off. */
> +	list_for_each_entry(nand, &nfc->chips, node) {
> +		chip = &nand->chip;
> +		for (i = 0; i < nand->nsels; i++)
> +			nand_reset(chip, i);
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops rk_nfc_pm_ops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(rk_nfc_suspend, rk_nfc_resume)
> +};
> +
> +static struct platform_driver rk_nfc_driver = {
> +	.probe = rk_nfc_probe,
> +	.remove = rk_nfc_remove,
> +	.driver = {
> +		.name = "rockchip-nfc",
> +		.of_match_table = rk_nfc_id_table,
> +		.pm = &rk_nfc_pm_ops,
> +	},
> +};
> +
> +module_platform_driver(rk_nfc_driver);
> +
> +MODULE_LICENSE("Dual MIT/GPL");
> +MODULE_AUTHOR("Yifeng Zhao <[e-mail]>");
> +MODULE_DESCRIPTION("Rockchip Nand Flash Controller Driver");
> +MODULE_ALIAS("platform:rockchip-nand-controller");
>

Johan Jonker June 9, 2020, 8:18 p.m. UTC | #4

On 6/9/20 6:10 PM, Johan Jonker wrote:

> On 6/9/20 9:40 AM, Yifeng Zhao wrote:

[..]

>> +static int rk_nfc_write_page(struct mtd_info *mtd, struct nand_chip *chip,
>> +			     const u8 *buf, int page, int raw)
>> +{
>> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
>> +	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
>> +	struct nand_ecc_ctrl *ecc = &chip->ecc;
>> +	int oob_step = (ecc->bytes > 60) ? NFC_MAX_OOB_PER_STEP :
>> +			NFC_MIN_OOB_PER_STEP;
>> +	int pages_per_blk = mtd->erasesize / mtd->writesize;
>> +	int ret = 0, i, boot_rom_mode = 0;
>> +	dma_addr_t dma_data, dma_oob;
>> +	u32 reg;
>> +	u8 *oob;
>> +
>> +	nand_prog_page_begin_op(chip, page, 0, NULL, 0);
>> +
>> +	if (!raw) {
>> +		memcpy(nfc->page_buf, buf, mtd->writesize);
>> +		memset(nfc->oob_buf, 0xff, oob_step * ecc->steps);
>> +
> 
>> +		/*
>> +		 * The first 8(some devices are 4 or 16) blocks in use by
> 
> are in use by
> 
>> +		 * the boot ROM and the first 32 bits of oob need to link
>> +		 * to the next page address in the same block.
>> +		 * Config the ECC algorithm supported by the boot ROM.
>> +		 */
>> +		if (page < pages_per_blk * rk_nand->boot_blks &&
>> +		    chip->options & NAND_IS_BOOT_MEDIUM) {
>> +			boot_rom_mode = 1;
>> +			if (rk_nand->boot_ecc != ecc->strength)
>> +				rk_nfc_hw_ecc_setup(chip, ecc,
>> +						    rk_nand->boot_ecc);
>> +		}
> 
> Helper?
> 
>> +
>> +		/*
> 


>> +		 * Swap the first oob with the seventh oob and bad block
> 
> 
> Swap the first oob byte with the seventh oob byte.
> 
>> +		 * mask is saved at the seventh oob.
> 
> The bad block mask is stored at the seventh oob byte.

Just wondering bit or byte?
seventh or eight?

> 
>> +		 */
>> +		swap(chip->oob_poi[0], chip->oob_poi[7]);

uint8_t *oob_poi;

1: oob_poi points to a byte I think?

What was the swap puspose? A bit or a byte?
There's 4 bytes oob per step.
Could you explain?

2: oob_poi[7] counting starts at [0] #1, [7] is then #8 ?
Is that correct?

>> +
>> +		for (i = 0; i < ecc->steps; i++) {
>> +			oob = chip->oob_poi + i * NFC_SYS_DATA_SIZE;
>> +			reg = oob[0] | oob[1] << 8 | oob[2] << 16 |
>> +			      oob[3] << 24;
>> +			if (!i && boot_rom_mode)
>> +				reg = (page & (pages_per_blk - 1)) * 4;
>> +
>> +			if (nfc->cfg->type == NFC_V6 ||
>> +			    nfc->cfg->type == NFC_V8)
>> +				nfc->oob_buf[i * oob_step / 4] = reg;
>> +			else
>> +				nfc->oob_buf[i] = reg;
>> +		}
>> +
>> +		dma_data = dma_map_single(nfc->dev, (void *)nfc->page_buf,
>> +					  mtd->writesize, DMA_TO_DEVICE);
>> +		dma_oob = dma_map_single(nfc->dev, nfc->oob_buf,
>> +					 ecc->steps * oob_step,
>> +					 DMA_TO_DEVICE);
>> +
>> +		reinit_completion(&nfc->done);
>> +		writel(INT_DMA, nfc->regs + nfc->cfg->int_en_off);
>> +
>> +		rk_nfc_xfer_start(nfc, NFC_WRITE, ecc->steps, dma_data,
>> +				  dma_oob);
>> +		ret = wait_for_completion_timeout(&nfc->done,
>> +						  msecs_to_jiffies(100));
>> +		if (!ret)
>> +			dev_warn(nfc->dev, "write: wait dma done timeout.\n");
>> +		/*
>> +		 * Whether the DMA transfer is completed or not. The driver
>> +		 * needs to check the NFC`s status register to see if the data
>> +		 * transfer was completed.
>> +		 */
>> +		ret = rk_nfc_wait_for_xfer_done(nfc);
>> +
>> +		dma_unmap_single(nfc->dev, dma_data, mtd->writesize,
>> +				 DMA_TO_DEVICE);
>> +		dma_unmap_single(nfc->dev, dma_oob, ecc->steps * oob_step,
>> +				 DMA_TO_DEVICE);
>> +
> 
>> +		if (boot_rom_mode && rk_nand->boot_ecc != ecc->strength)
>> +			rk_nfc_hw_ecc_setup(chip, ecc, ecc->strength);
> 
> Helper?
> 
>> +
>> +		if (ret) {
>> +			ret = -EIO;
> 
>> +			dev_err(nfc->dev,
>> +				 "write: wait transfer done timeout.\n");
> 
> align
> 
>> +		}
>> +	} else {

>> +		rk_nfc_write_buf(chip, buf, mtd->writesize + + mtd->oobsize);

Too many +++ here?                                         ^ ^

>> +	}
>> +
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = nand_prog_page_end_op(chip);
>> +
>> +	/* Deselect the currently selected target. */
>> +	rk_nfc_select_chip(chip, -1);
>> +
>> +	return ret;
>> +}

Miquel Raynal June 11, 2020, 7:53 a.m. UTC | #5

Hi Yifeng,


[...]

> +static void rk_nfc_disable_clk(struct rk_nfc_clk *clk)
> +{
> +	if (!IS_ERR(clk->nfc_clk))
> +		clk_disable_unprepare(clk->nfc_clk);
> +	clk_disable_unprepare(clk->ahb_clk);
> +}
> +
> +static int rk_nfc_ooblayout_free(struct mtd_info *mtd, int section,
> +				 struct mtd_oob_region *oob_region)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +
> +	if (section >= chip->ecc.steps)
> +		return -ERANGE;
> +
> +	if (!section) {
> +		/* The first byte is bad block mask flag. */
> +		oob_region->length = NFC_SYS_DATA_SIZE - 1;
> +		oob_region->offset = 1;
> +	} else {
> +		oob_region->length = NFC_SYS_DATA_SIZE;
> +		oob_region->offset = section * NFC_SYS_DATA_SIZE;
> +	}
> +
> +	return 0;
> +}
> +
> +static int rk_nfc_ooblayout_ecc(struct mtd_info *mtd, int section,
> +				struct mtd_oob_region *oob_region)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +
> +	if (section)
> +		return -ERANGE;
> +
> +	oob_region->offset = NFC_SYS_DATA_SIZE * chip->ecc.steps;
> +	oob_region->length = mtd->oobsize - oob_region->offset;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops rk_nfc_ooblayout_ops = {
> +	.free = rk_nfc_ooblayout_free,
> +	.ecc = rk_nfc_ooblayout_ecc,
> +};

This looks like a copy of the core's nand_lp_ooblayout, better use the
generic one than creation your own.

> +
> +static int rk_nfc_ecc_init(struct device *dev, struct mtd_info *mtd)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +	struct nand_ecc_ctrl *ecc = &chip->ecc;
> +	const u8 *strengths = nfc->cfg->ecc_strengths;
> +	u8 max_strength, nfc_max_strength;
> +	int i;
> +
> +	nfc_max_strength = nfc->cfg->ecc_strengths[0];
> +	/* If optional dt settings not present. */
> +	if (!ecc->size || !ecc->strength ||
> +	    ecc->strength > nfc_max_strength) {
> +		/* Use datasheet requirements. */
> +		ecc->strength = chip->base.eccreq.strength;
> +		ecc->size = chip->base.eccreq.step_size;
> +
> +		/*
> +		 * Align eccstrength and eccsize.
> +		 * This controller only supports 512 and 1024 sizes.
> +		 */
> +		if (chip->ecc.size < 1024) {
> +			if (mtd->writesize > 512) {
> +				chip->ecc.size = 1024;
> +				chip->ecc.strength <<= 1;
> +			} else {
> +				dev_err(dev, "ecc.size not supported\n");
> +				return -EINVAL;
> +			}
> +		} else {
> +			chip->ecc.size = 1024;
> +		}
> +
> +		ecc->steps = mtd->writesize / ecc->size;
> +
> +		/*
> +		 * HW ECC always request ECC bytes for 1024 bytes blocks.
> +		 * 4 Bytes is oob for sys data.
> +		 */
> +		max_strength = ((mtd->oobsize / ecc->steps) - 4) * 8 /
> +				 fls(8 * 1024);
> +		if (max_strength > nfc_max_strength)
> +			max_strength = nfc_max_strength;
> +
> +		for (i = 0; i < 4; i++) {
> +			if (max_strength >= strengths[i])
> +				break;
> +		}
> +
> +		if (i >= 4) {
> +			dev_err(nfc->dev, "unsupported strength\n");
> +			return -ENOTSUPP;
> +		}
> +
> +		ecc->strength = strengths[i];
> +	}
> +	ecc->steps = mtd->writesize / ecc->size;
> +	ecc->bytes = DIV_ROUND_UP(ecc->strength * fls(8 * 1024), 8);
> +	/* HW ECC always work with even numbers of ECC bytes. */
> +	ecc->bytes = ALIGN(ecc->bytes, 2);
> +
> +	rk_nfc_hw_ecc_setup(chip, ecc, ecc->strength);
> +
> +	return 0;
> +}
> +
> +static int rk_nfc_attach_chip(struct nand_chip *chip)
> +{
> +	struct mtd_info *mtd = nand_to_mtd(chip);
> +	struct device *dev = mtd->dev.parent;
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
> +	struct nand_ecc_ctrl *ecc = &chip->ecc;
> +	int len;
> +	int ret;
> +
> +	if (chip->options & NAND_BUSWIDTH_16) {
> +		dev_err(dev, "16 bits bus width not supported");
> +		return -EINVAL;
> +	}
> +
> +	if (ecc->mode != NAND_ECC_HW)
> +		return 0;
> +
> +	ret = rk_nfc_ecc_init(dev, mtd);
> +	if (ret)
> +		return ret;
> +	rk_nand->spare_per_sector = ecc->bytes + NFC_SYS_DATA_SIZE;
> +
> +	/* Check buffer first, avoid duplicate alloc buffer. */
> +	if (nfc->buffer)
> +		return 0;
> +
> +	len = mtd->writesize + mtd->oobsize;
> +	nfc->buffer = devm_kzalloc(dev, len, GFP_KERNEL | GFP_DMA);
> +	if (!nfc->buffer)
> +		return -ENOMEM;
> +
> +	nfc->page_buf = nfc->buffer;
> +	len = ecc->steps * NFC_MAX_OOB_PER_STEP;
> +	nfc->oob_buf = devm_kzalloc(dev, len, GFP_KERNEL | GFP_DMA);
> +	if (!nfc->oob_buf) {
> +		devm_kfree(dev, nfc->buffer);

This is not needed I suppose and you should probably just return the
error.

> +		nfc->buffer = NULL;
> +		nfc->oob_buf = NULL;
> +		return -ENOMEM;
> +	}
> +
> +	chip->ecc.write_page_raw = rk_nfc_write_page_raw;
> +	chip->ecc.write_page = rk_nfc_write_page_hwecc;
> +	chip->ecc.write_oob_raw = rk_nfc_write_oob_std;
> +	chip->ecc.write_oob = rk_nfc_write_oob_std;
> +
> +	chip->ecc.read_page_raw = rk_nfc_read_page_raw;
> +	chip->ecc.read_page = rk_nfc_read_page_hwecc;
> +	chip->ecc.read_oob_raw = rk_nfc_read_oob_std;
> +	chip->ecc.read_oob = rk_nfc_read_oob_std;
> +
> +	return 0;
> +}
> +
> +static const struct nand_controller_ops rk_nfc_controller_ops = {
> +	.attach_chip = rk_nfc_attach_chip,
> +	.exec_op = rk_nfc_exec_op,
> +	.setup_data_interface = rk_nfc_setup_data_interface,
> +};
> +
> +static int rk_nfc_nand_chip_init(struct device *dev, struct rk_nfc *nfc,
> +				 struct device_node *np)
> +{
> +	struct rk_nfc_nand_chip *nand;

Could you call it rknand or something similar, just so that it is easy
to get the difference with the nand_chip structure.

> +	struct nand_chip *chip;
> +	struct mtd_info *mtd;
> +	int nsels;
> +	u32 tmp;
> +	int ret;
> +	int i;
> +
> +	if (!of_get_property(np, "reg", &nsels))
> +		return -ENODEV;
> +	nsels /= sizeof(u32);
> +	if (!nsels || nsels > NFC_MAX_NSELS) {
> +		dev_err(dev, "invalid reg property size %d\n", nsels);
> +		return -EINVAL;
> +	}
> +
> +	nand = devm_kzalloc(dev, sizeof(*nand) + nsels * sizeof(u8),
> +			    GFP_KERNEL);
> +	if (!nand)
> +		return -ENOMEM;
> +
> +	nand->nsels = nsels;
> +	for (i = 0; i < nsels; i++) {
> +		ret = of_property_read_u32_index(np, "reg", i, &tmp);
> +		if (ret) {
> +			dev_err(dev, "reg property failure : %d\n", ret);
> +			return ret;
> +		}
> +
> +		if (tmp >= NFC_MAX_NSELS) {
> +			dev_err(dev, "invalid CS: %u\n", tmp);
> +			return -EINVAL;
> +		}
> +
> +		if (test_and_set_bit(tmp, &nfc->assigned_cs)) {
> +			dev_err(dev, "CS %u already assigned\n", tmp);
> +			return -EINVAL;
> +		}
> +
> +		nand->sels[i] = tmp;
> +	}
> +
> +	chip = &nand->chip;
> +	chip->controller = &nfc->controller;
> +
> +	nand_set_flash_node(chip, np);
> +
> +	nand_set_controller_data(chip, nfc);
> +
> +	chip->options |= NAND_USE_BOUNCE_BUFFER | NAND_NO_SUBPAGE_WRITE;
> +	chip->bbt_options = NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;
> +
> +	/* Set default mode in case dt entry is missing. */
> +	chip->ecc.mode = NAND_ECC_HW;
> +
> +	mtd = nand_to_mtd(chip);
> +	mtd->owner = THIS_MODULE;
> +	mtd->dev.parent = dev;
> +
> +	if (!mtd->name) {
> +		dev_err(nfc->dev, "NAND label property is mandatory\n");
> +		return -EINVAL;
> +	}
> +
> +	mtd_set_ooblayout(mtd, &rk_nfc_ooblayout_ops);
> +	rk_nfc_hw_init(nfc);
> +	ret = nand_scan(chip, nsels);
> +	if (ret)
> +		return ret;
> +
> +	if (chip->options & NAND_IS_BOOT_MEDIUM) {
> +		ret = of_property_read_u32(np, "rockchip,boot-blks", &tmp);
> +		nand->boot_blks = ret ? 0 : tmp;
> +
> +		ret = of_property_read_u32(np, "rockchip,boot-ecc-strength",
> +					   &tmp);
> +		nand->boot_ecc = ret ? chip->ecc.strength : tmp;
> +	}
> +
> +	ret = mtd_device_register(mtd, NULL, 0);
> +	if (ret) {
> +		dev_err(dev, "mtd parse partition error\n");
> +		nand_release(chip);

nand_cleanup() here

> +		return ret;
> +	}
> +
> +	list_add_tail(&nand->node, &nfc->chips);
> +
> +	return 0;
> +}
> +
> +static int rk_nfc_nand_chips_init(struct device *dev, struct rk_nfc *nfc)
> +{
> +	struct device_node *np = dev->of_node;
> +	struct device_node *nand_np;
> +	int ret = -EINVAL;
> +	int tmp;
> +
> +	for_each_child_of_node(np, nand_np) {
> +		tmp = rk_nfc_nand_chip_init(dev, nfc, nand_np);
> +		if (tmp) {
> +			of_node_put(nand_np);
> +			return ret;
> +		}
> +		/* At least one nand chip is initialized. */
> +		ret = 0;

I think it's more readable if you count up the number of devices
initialized by browsing the list of chips handled by the controller
(list_is_empty() would work just fine).

> +	}
> +
> +	return ret;
> +}
> +
> +static struct nfc_cfg nfc_v6_cfg = {
> +		.type			= NFC_V6,
> +		.ecc_strengths		= {60, 40, 24, 16},
> +		.ecc_cfgs		= {
> +			0x00040011, 0x00040001, 0x00000011, 0x00000001,
> +		},
> +		.flctl_off		= 0x08,
> +		.bchctl_off		= 0x0C,
> +		.dma_cfg_off		= 0x10,
> +		.dma_data_buf_off	= 0x14,
> +		.dma_oob_buf_off	= 0x18,
> +		.dma_st_off		= 0x1C,
> +		.bch_st_off		= 0x20,
> +		.randmz_off		= 0x150,
> +		.int_en_off		= 0x16C,
> +		.int_clr_off		= 0x170,
> +		.int_st_off		= 0x174,
> +		.oob0_off		= 0x200,
> +		.oob1_off		= 0x230,
> +		.ecc0			= {
> +			.err_flag_bit	= 2,
> +			.low		= 3,
> +			.low_mask	= 0x1F,
> +			.low_bn		= 5,
> +			.high		= 27,
> +			.high_mask	= 0x1,
> +		},
> +		.ecc1			= {
> +			.err_flag_bit	= 15,
> +			.low		= 16,
> +			.low_mask	= 0x1F,
> +			.low_bn		= 5,
> +			.high		= 29,
> +			.high_mask	= 0x1,
> +		},
> +};
> +
> +static struct nfc_cfg nfc_v8_cfg = {
> +		.type			= NFC_V8,
> +		.ecc_strengths		= {16, 16, 16, 16},
> +		.ecc_cfgs		= {
> +			0x00000001, 0x00000001, 0x00000001, 0x00000001,
> +		},
> +		.flctl_off		= 0x08,
> +		.bchctl_off		= 0x0C,
> +		.dma_cfg_off		= 0x10,
> +		.dma_data_buf_off	= 0x14,
> +		.dma_oob_buf_off	= 0x18,
> +		.dma_st_off		= 0x1C,
> +		.bch_st_off		= 0x20,
> +		.bch_st_off		= 0x20,
> +		.randmz_off		= 0x150,
> +		.int_en_off		= 0x16C,
> +		.int_clr_off		= 0x170,
> +		.int_st_off		= 0x174,
> +		.oob0_off		= 0x200,
> +		.oob1_off		= 0x230,
> +		.ecc0			= {
> +			.err_flag_bit	= 2,
> +			.low		= 3,
> +			.low_mask	= 0x1F,
> +			.low_bn		= 5,
> +			.high		= 27,
> +			.high_mask	= 0x1,
> +		},
> +		.ecc1			= {
> +			.err_flag_bit	= 15,
> +			.low		= 16,
> +			.low_mask	= 0x1F,
> +			.low_bn		= 5,
> +			.high		= 29,
> +			.high_mask	= 0x1,
> +		},
> +};
> +
> +static struct nfc_cfg nfc_v9_cfg = {
> +		.type			= NFC_V9,
> +		.ecc_strengths		= {70, 60, 40, 16},
> +		.ecc_cfgs		= {
> +			0x00000001, 0x06000001, 0x04000001, 0x02000001,
> +		},
> +		.flctl_off		= 0x10,
> +		.bchctl_off		= 0x20,
> +		.dma_cfg_off		= 0x30,
> +		.dma_data_buf_off	= 0x34,
> +		.dma_oob_buf_off	= 0x38,
> +		.dma_st_off		= 0x3C,
> +		.bch_st_off		= 0x150,
> +		.randmz_off		= 0x208,
> +		.int_en_off		= 0x120,
> +		.int_clr_off		= 0x124,
> +		.int_st_off		= 0x128,
> +		.oob0_off		= 0x200,
> +		.oob1_off		= 0x204,
> +		.ecc0			= {
> +			.err_flag_bit	= 2,
> +			.low		= 3,
> +			.low_mask	= 0x7F,
> +			.low_bn		= 7,
> +			.high		= 0,
> +			.high_mask	= 0x0,
> +		},
> +		.ecc1			= {
> +			.err_flag_bit	= 18,
> +			.low		= 19,
> +			.low_mask	= 0x7F,
> +			.low_bn		= 7,
> +			.high		= 0,
> +			.high_mask	= 0x0,
> +		},
> +};
> +
> +static const struct of_device_id rk_nfc_id_table[] = {
> +	{.compatible = "rockchip,px30-nfc",
> +		.data = &nfc_v9_cfg },
> +	{.compatible = "rockchip,rk2928-nfc",
> +		.data = &nfc_v6_cfg },
> +	{.compatible = "rockchip,rv1108-nfc",
> +		.data = &nfc_v8_cfg },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, rk_nfc_id_table);
> +
> +static int rk_nfc_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct rk_nfc *nfc;
> +	struct resource *res;
> +	int ret, irq;
> +
> +	nfc = devm_kzalloc(dev, sizeof(*nfc), GFP_KERNEL);
> +	if (!nfc)
> +		return -ENOMEM;
> +
> +	nand_controller_init(&nfc->controller);
> +	INIT_LIST_HEAD(&nfc->chips);
> +	nfc->controller.ops = &rk_nfc_controller_ops;
> +
> +	nfc->cfg = of_device_get_match_data(dev);
> +	nfc->dev = dev;
> +
> +	init_completion(&nfc->done);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	nfc->regs = devm_ioremap_resource(dev, res);

There is a devm_platform_ioremap_resource for that

> +	if (IS_ERR(nfc->regs)) {
> +		ret = PTR_ERR(nfc->regs);
> +		goto release_nfc;
> +	}
> +
> +	nfc->clk.nfc_clk = devm_clk_get(dev, "nfc");
> +	if (IS_ERR(nfc->clk.nfc_clk)) {
> +		dev_dbg(dev, "no nfc clk\n");
> +		/* Some old device, sush as rk3066, has no nfc clk. */

I would drop the dbg trace and reining nfc_clk to NULL.

Also it might be worth checking the compatible here to ensure this is
allowed.

> +	}
> +
> +	nfc->clk.ahb_clk = devm_clk_get(dev, "ahb");
> +	if (IS_ERR(nfc->clk.ahb_clk)) {
> +		dev_err(dev, "no ahb clk\n");
> +		ret = PTR_ERR(nfc->clk.ahb_clk);
> +		goto release_nfc;
> +	}
> +
> +	ret = rk_nfc_enable_clk(dev, &nfc->clk);
> +	if (ret)
> +		goto release_nfc;
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0) {
> +		dev_err(dev, "no nfc irq resource\n");
> +		ret = -EINVAL;
> +		goto clk_disable;
> +	}
> +
> +	writel(0, nfc->regs + nfc->cfg->int_en_off);
> +	ret = devm_request_irq(dev, irq, rk_nfc_irq, 0x0, "rk-nand", nfc);
> +	if (ret) {
> +		dev_err(dev, "failed to request nfc irq\n");
> +		goto clk_disable;
> +	}
> +
> +	platform_set_drvdata(pdev, nfc);
> +
> +	ret = rk_nfc_nand_chips_init(dev, nfc);
> +	if (ret) {
> +		dev_err(dev, "failed to init nand chips\n");
> +		goto clk_disable;
> +	}
> +	return 0;
> +
> +clk_disable:
> +	rk_nfc_disable_clk(&nfc->clk);
> +release_nfc:
> +	return ret;
> +}
> +
> +static int rk_nfc_remove(struct platform_device *pdev)
> +{
> +	struct rk_nfc *nfc = platform_get_drvdata(pdev);
> +	struct rk_nfc_nand_chip *nand;
> +
> +	while (!list_empty(&nfc->chips)) {
> +		nand = list_first_entry(&nfc->chips, struct rk_nfc_nand_chip,
> +					node);
> +		nand_release(&nand->chip);

nand_release has been removed (in Linus' branch since this
week).

> +		list_del(&nand->node);
> +	}
> +
> +	rk_nfc_disable_clk(&nfc->clk);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused rk_nfc_suspend(struct device *dev)
> +{
> +	struct rk_nfc *nfc = dev_get_drvdata(dev);
> +
> +	rk_nfc_disable_clk(&nfc->clk);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused rk_nfc_resume(struct device *dev)
> +{
> +	struct rk_nfc *nfc = dev_get_drvdata(dev);
> +	struct rk_nfc_nand_chip *nand;
> +	struct nand_chip *chip;
> +	int ret;
> +	u32 i;
> +
> +	ret = rk_nfc_enable_clk(dev, &nfc->clk);
> +	if (ret)
> +		return ret;
> +
> +	/* Reset NAND chip if VCC was powered off. */
> +	list_for_each_entry(nand, &nfc->chips, node) {
> +		chip = &nand->chip;
> +		for (i = 0; i < nand->nsels; i++)
> +			nand_reset(chip, i);
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops rk_nfc_pm_ops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(rk_nfc_suspend, rk_nfc_resume)
> +};
> +
> +static struct platform_driver rk_nfc_driver = {
> +	.probe = rk_nfc_probe,
> +	.remove = rk_nfc_remove,
> +	.driver = {
> +		.name = "rockchip-nfc",
> +		.of_match_table = rk_nfc_id_table,
> +		.pm = &rk_nfc_pm_ops,
> +	},
> +};
> +
> +module_platform_driver(rk_nfc_driver);
> +
> +MODULE_LICENSE("Dual MIT/GPL");
> +MODULE_AUTHOR("Yifeng Zhao <[e-mail]>");
> +MODULE_DESCRIPTION("Rockchip Nand Flash Controller Driver");
> +MODULE_ALIAS("platform:rockchip-nand-controller");




Thanks,
Miquèl

Johan Jonker June 13, 2020, 1:31 p.m. UTC | #6

Hi Yifeng, Miquel,

Some more comments about swap();

On 6/9/20 9:40 AM, Yifeng Zhao wrote:

[..]

> +static int rk_nfc_ooblayout_free(struct mtd_info *mtd, int section,
> +				 struct mtd_oob_region *oob_region)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +

> +	if (section >= chip->ecc.steps)
> +		return -ERANGE;

Given:

NFC_SYS_DATA_SIZE = 4
chip->ecc.steps = 8
section [0..7]

Total free OOB size advertised to the MTD framework is:

ecc.steps * NFC_SYS_DATA_SIZE - 1 BBM
8 * 4 - 1 = 31 bytes

With link address in OOB byte [0..3] this become:
31 - 4 = 27 bytes

Does that give data lost?
Should we limit the number of free OOB bytes by 4 more to be save?
Is my calculation correct?

See further questions about this below.

> +
> +	if (!section) {
> +		/* The first byte is bad block mask flag. */
> +		oob_region->length = NFC_SYS_DATA_SIZE - 1;
> +		oob_region->offset = 1;
> +	} else {
> +		oob_region->length = NFC_SYS_DATA_SIZE;
> +		oob_region->offset = section * NFC_SYS_DATA_SIZE;
> +	}
> +
> +	return 0;
> +}
> +
> +static int rk_nfc_ooblayout_ecc(struct mtd_info *mtd, int section,
> +				struct mtd_oob_region *oob_region)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +

> +	if (section)
> +		return -ERANGE;

With the formule above a section > 0 does not alow ECC.

Just a question about the MTD inner working for Miquel:

With ooblayout_free using 8 steps and this just 1 does it still generate
the correct ECC? Does it calculate ECC over 1024B or over 8*1024B ?

Should we move the text that explains the layout closer to these
functions and add a little more text to explain why we choose this
particular layout?

/*
 * NFC Page Data Layout:
 *	1024 Bytes Data + 4Bytes sys data + 28Bytes~124Bytes ecc +
 *	1024 Bytes Data + 4Bytes sys data + 28Bytes~124Bytes ecc +
 *	......
 * NAND Page Data Layout:
 *	1024 * n Data + m Bytes oob
 * Original Bad Block Mask Location:
 *	First byte of oob(spare).
 * nand_chip->oob_poi data layout:
 *	4Bytes sys data + .... + 4Bytes sys data + ecc data.
 */

We expect now ECC data after n steps * 4 OOB bytes,
but are we still using it with HW ECC or only for raw?

> +
> +	oob_region->offset = NFC_SYS_DATA_SIZE * chip->ecc.steps;
> +	oob_region->length = mtd->oobsize - oob_region->offset;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops rk_nfc_ooblayout_ops = {
> +	.free = rk_nfc_ooblayout_free,
> +	.ecc = rk_nfc_ooblayout_ecc,
> +};

[..]

> +static int rk_nfc_write_page(struct mtd_info *mtd, struct nand_chip *chip,
> +			     const u8 *buf, int page, int raw)
> +{
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
> +	struct nand_ecc_ctrl *ecc = &chip->ecc;
> +	int oob_step = (ecc->bytes > 60) ? NFC_MAX_OOB_PER_STEP :
> +			NFC_MIN_OOB_PER_STEP;
> +	int pages_per_blk = mtd->erasesize / mtd->writesize;
> +	int ret = 0, i, boot_rom_mode = 0;
> +	dma_addr_t dma_data, dma_oob;
> +	u32 reg;
> +	u8 *oob;
> +
> +	nand_prog_page_begin_op(chip, page, 0, NULL, 0);
> +
> +	if (!raw) {
> +		memcpy(nfc->page_buf, buf, mtd->writesize);
> +		memset(nfc->oob_buf, 0xff, oob_step * ecc->steps);
> +
> +		/*
> +		 * The first 8(some devices are 4 or 16) blocks in use by
> +		 * the boot ROM and the first 32 bits of oob need to link
> +		 * to the next page address in the same block.
> +		 * Config the ECC algorithm supported by the boot ROM.
> +		 */
> +		if (page < pages_per_blk * rk_nand->boot_blks &&
> +		    chip->options & NAND_IS_BOOT_MEDIUM) {
> +			boot_rom_mode = 1;
> +			if (rk_nand->boot_ecc != ecc->strength)
> +				rk_nfc_hw_ecc_setup(chip, ecc,
> +						    rk_nand->boot_ecc);
> +		}
> +
> +		/*
> +		 * Swap the first oob with the seventh oob and bad block
> +		 * mask is saved at the seventh oob.
> +		 */
> +		swap(chip->oob_poi[0], chip->oob_poi[7]);

Add more info on why this is swapped.

LA[0..3] is a link address that the BBM shouldn't over write.
For Yifeng: Is there an other reason?

Before swap:

BBM  OOB1 OOB2 OOB3, OOB4 OOB5 OOB6 OOB7, OOB8 ....

After swap:

OOB7 OOB1 OOB2 OOB3, OOB4 OOB5 OOB6 BBM , OOB8 ....

If (!i && boot_rom_mode):

LA0  LA1  LA2  LA3 , OOB4 OOB5 OOB6 BBM , OOB8 ....

Read back after swap again:

BBM  LA1  LA2  LA3 , OOB4 OOB5 OOB6 LA0 , OOB8 ....

Question:
Are data OOB7 OOB1 OOB2 OOB3 lost now?
Is this correct?

#################################################
Proposal:
Should we reduce the free OOB size by 4
and shift everything 4 bytes to recover all bytes?
Replace the first 4 bytes with 0XFF or LA[0..3].

Normal:
0xFF 0XFF 0XFF 0xFF, BBM  OOB1 OOB2 OOB3, OOB4

If (!i && boot_rom_mode):
LA0  LA1  LA2  LA3 , BBM  OOB1 OOB2 OOB3, OOB4

Question for Miquel and Yifeng:
Does this work? Could you test?

> +
> +		for (i = 0; i < ecc->steps; i++) {

Just a proposel:

		if (!i && boot_rom_mode)
			reg = (page & (pages_per_blk - 1)) * 4;
		else if (!i)
			reg = 0xFFFFFFFF;
		else	
			oob = chip->oob_poi + (i-1) * NFC_SYS_DATA_SIZE;
			reg = oob[0] | oob[1] << 8 | oob[2] << 16 |
			      oob[3] << 24;

> +
> +			if (nfc->cfg->type == NFC_V6 ||
> +			    nfc->cfg->type == NFC_V8)
> +				nfc->oob_buf[i * oob_step / 4] = reg;
> +			else
> +				nfc->oob_buf[i] = reg;
> +		}
> +
> +		dma_data = dma_map_single(nfc->dev, (void *)nfc->page_buf,
> +					  mtd->writesize, DMA_TO_DEVICE);
> +		dma_oob = dma_map_single(nfc->dev, nfc->oob_buf,
> +					 ecc->steps * oob_step,
> +					 DMA_TO_DEVICE);
> +
> +		reinit_completion(&nfc->done);
> +		writel(INT_DMA, nfc->regs + nfc->cfg->int_en_off);
> +
> +		rk_nfc_xfer_start(nfc, NFC_WRITE, ecc->steps, dma_data,
> +				  dma_oob);
> +		ret = wait_for_completion_timeout(&nfc->done,
> +						  msecs_to_jiffies(100));
> +		if (!ret)
> +			dev_warn(nfc->dev, "write: wait dma done timeout.\n");
> +		/*
> +		 * Whether the DMA transfer is completed or not. The driver
> +		 * needs to check the NFC`s status register to see if the data
> +		 * transfer was completed.
> +		 */
> +		ret = rk_nfc_wait_for_xfer_done(nfc);
> +
> +		dma_unmap_single(nfc->dev, dma_data, mtd->writesize,
> +				 DMA_TO_DEVICE);
> +		dma_unmap_single(nfc->dev, dma_oob, ecc->steps * oob_step,
> +				 DMA_TO_DEVICE);
> +
> +		if (boot_rom_mode && rk_nand->boot_ecc != ecc->strength)
> +			rk_nfc_hw_ecc_setup(chip, ecc, ecc->strength);
> +
> +		if (ret) {
> +			ret = -EIO;
> +			dev_err(nfc->dev,
> +				 "write: wait transfer done timeout.\n");
> +		}
> +	} else {
> +		rk_nfc_write_buf(chip, buf, mtd->writesize + + mtd->oobsize);

Remove a '+'

> +	}
> +
> +	if (ret)
> +		return ret;
> +
> +	ret = nand_prog_page_end_op(chip);
> +
> +	/* Deselect the currently selected target. */
> +	rk_nfc_select_chip(chip, -1);
> +
> +	return ret;
> +}
> +
> +static int rk_nfc_write_page_raw(struct nand_chip *chip, const u8 *buf,
> +				 int oob_on, int page)
> +{
> +	struct mtd_info *mtd = nand_to_mtd(chip);
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +	u32 i;
> +
> +	memset(nfc->buffer, 0xff, mtd->writesize + mtd->oobsize);
> +	swap(chip->oob_poi[0], chip->oob_poi[7]);
> +	for (i = 0; i < chip->ecc.steps; i++) {
> +		if (buf)
> +			memcpy(rk_data_ptr(chip, i), data_ptr(chip, buf, i),
> +			       chip->ecc.size);
> +
> +		memcpy(rk_oob_ptr(chip, i), oob_ptr(chip, i),
> +		       NFC_SYS_DATA_SIZE);
> +	}
> +
> +	return rk_nfc_write_page(mtd, chip, nfc->buffer, page, 1);
> +}
> +
> +static int rk_nfc_write_oob_std(struct nand_chip *chip, int page)
> +{
> +	return rk_nfc_write_page_raw(chip, NULL, 1, page);
> +}
> +
> +static int rk_nfc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
> +			    u32 data_offs, u32 readlen,
> +			    u8 *buf, int page, int raw)
> +{
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
> +	struct nand_ecc_ctrl *ecc = &chip->ecc;
> +	int oob_step = (ecc->bytes > 60) ? NFC_MAX_OOB_PER_STEP :
> +			NFC_MIN_OOB_PER_STEP;
> +	int pages_per_blk = mtd->erasesize / mtd->writesize;
> +	dma_addr_t dma_data, dma_oob;
> +	int ret = 0, i, boot_rom_mode = 0;
> +	int bitflips = 0, bch_st;
> +	u8 *oob;
> +	u32 tmp;
> +
> +	nand_read_page_op(chip, page, 0, NULL, 0);
> +	if (!raw) {
> +		dma_data = dma_map_single(nfc->dev, nfc->page_buf,
> +					  mtd->writesize,
> +					  DMA_FROM_DEVICE);
> +		dma_oob = dma_map_single(nfc->dev, nfc->oob_buf,
> +					 ecc->steps * oob_step,
> +					 DMA_FROM_DEVICE);
> +
> +		/*
> +		 * The first 8(some devices are 4 or 16) blocks in use by
> +		 * the bootrom.
> +		 * Config the ECC algorithm supported by the boot ROM.
> +		 */
> +		if (page < pages_per_blk * rk_nand->boot_blks &&
> +		    chip->options & NAND_IS_BOOT_MEDIUM) {
> +			boot_rom_mode = 1;
> +			if (rk_nand->boot_ecc != ecc->strength)
> +				rk_nfc_hw_ecc_setup(chip, ecc,
> +						    rk_nand->boot_ecc);
> +		}
> +
> +		reinit_completion(&nfc->done);
> +		writel(INT_DMA, nfc->regs + nfc->cfg->int_en_off);
> +		rk_nfc_xfer_start(nfc, NFC_READ, ecc->steps, dma_data,
> +				  dma_oob);
> +		ret = wait_for_completion_timeout(&nfc->done,
> +						  msecs_to_jiffies(100));
> +		if (!ret)
> +			dev_warn(nfc->dev, "read: wait dma done timeout.\n");
> +		/*
> +		 * Whether the DMA transfer is completed or not. The driver
> +		 * needs to check the NFC`s status register to see if the data
> +		 * transfer was completed.
> +		 */
> +		ret = rk_nfc_wait_for_xfer_done(nfc);
> +		dma_unmap_single(nfc->dev, dma_data, mtd->writesize,
> +				 DMA_FROM_DEVICE);
> +		dma_unmap_single(nfc->dev, dma_oob, ecc->steps * oob_step,
> +				 DMA_FROM_DEVICE);
> +
> +		if (ret) {
> +			bitflips = -EIO;
> +			dev_err(nfc->dev,
> +				 "read: wait transfer done timeout.\n");
> +			goto out;
> +		}
> +
> +		for (i = 0; i < ecc->steps; i++) {
> +			oob = chip->oob_poi + i * NFC_SYS_DATA_SIZE;
> +			if (nfc->cfg->type == NFC_V6 ||
> +			    nfc->cfg->type == NFC_V8)
> +				tmp = nfc->oob_buf[i * oob_step / 4];
> +			else
> +				tmp = nfc->oob_buf[i];
> +			*oob++ = (u8)tmp;
> +			*oob++ = (u8)(tmp >> 8);
> +			*oob++ = (u8)(tmp >> 16);
> +			*oob++ = (u8)(tmp >> 24);
> +		}
> +
> +		/*
> +		 * Swap the first oob with the seventh oob and bad block
> +		 * mask is saved at the seventh oob.
> +		 */
> +		swap(chip->oob_poi[0], chip->oob_poi[7]);
> +
> +		for (i = 0; i < ecc->steps / 2; i++) {
> +			bch_st = readl_relaxed(nfc->regs +
> +					       nfc->cfg->bch_st_off + i * 4);
> +			if (bch_st & BIT(nfc->cfg->ecc0.err_flag_bit) ||
> +			    bch_st & BIT(nfc->cfg->ecc1.err_flag_bit)) {
> +				mtd->ecc_stats.failed++;
> +				bitflips = -1;
> +			} else {
> +				ret = ECC_ERR_CNT(bch_st, nfc->cfg->ecc0);
> +				mtd->ecc_stats.corrected += ret;
> +				bitflips = max_t(u32, bitflips, ret);
> +
> +				ret = ECC_ERR_CNT(bch_st, nfc->cfg->ecc1);
> +				mtd->ecc_stats.corrected += ret;
> +				bitflips = max_t(u32, bitflips, ret);
> +			}
> +		}
> +out:
> +		memcpy(buf, nfc->page_buf, mtd->writesize);
> +
> +		if (boot_rom_mode && rk_nand->boot_ecc != ecc->strength)
> +			rk_nfc_hw_ecc_setup(chip, ecc, ecc->strength);
> +
> +		if (bitflips < 0)
> +			dev_err(nfc->dev, "read page: %x ecc error!\n", page);
> +	} else {
> +		rk_nfc_read_buf(chip, buf, mtd->writesize + mtd->oobsize);
> +	}
> +	/* Deselect the currently selected target. */
> +	rk_nfc_select_chip(chip, -1);
> +
> +	return bitflips;
> +}
> +
> +static int rk_nfc_write_page_hwecc(struct nand_chip *chip, const u8 *buf,
> +				   int oob_on, int page)
> +{
> +	return rk_nfc_write_page(nand_to_mtd(chip), chip, buf, page, 0);
> +}
> +
> +static int rk_nfc_read_page_hwecc(struct nand_chip *chip, u8 *p, int oob_on,
> +				  int pg)
> +{
> +	struct mtd_info *mtd = nand_to_mtd(chip);
> +
> +	return rk_nfc_read_page(mtd, chip, 0, mtd->writesize, p, pg, 0);
> +}
> +
> +static int rk_nfc_read_page_raw(struct nand_chip *chip, u8 *buf, int oob_on,
> +				int page)
> +{
> +	struct mtd_info *mtd = nand_to_mtd(chip);
> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> +	int i, ret;
> +
> +	ret = rk_nfc_read_page(mtd, chip, 0, mtd->writesize, nfc->buffer,
> +			       page, 1);
> +	if (ret < 0)
> +		return ret;
> +
> +	for (i = 0; i < chip->ecc.steps; i++) {
> +		memcpy(oob_ptr(chip, i), rk_oob_ptr(chip, i),
> +		       NFC_SYS_DATA_SIZE);
> +
> +		if (buf)
> +			memcpy(data_ptr(chip, buf, i), rk_data_ptr(chip, i),
> +			       chip->ecc.size);
> +	}
> +	swap(chip->oob_poi[0], chip->oob_poi[7]);
> +
> +	return ret;
> +}

[..]

Miquel Raynal June 15, 2020, 7:47 a.m. UTC | #7

Hi Johan,

Johan Jonker <[e-mail]> wrote on Sat, 13 Jun 2020 15:31:52
+0200:

> Hi Yifeng, Miquel,
> 
> Some more comments about swap();
> 
> On 6/9/20 9:40 AM, Yifeng Zhao wrote:
> 
> [..]
> 
> > +static int rk_nfc_ooblayout_free(struct mtd_info *mtd, int section,
> > +				 struct mtd_oob_region *oob_region)
> > +{
> > +	struct nand_chip *chip = mtd_to_nand(mtd);
> > +  
> 
> > +	if (section >= chip->ecc.steps)
> > +		return -ERANGE;  
> 
> Given:
> 
> NFC_SYS_DATA_SIZE = 4
> chip->ecc.steps = 8
> section [0..7]
> 
> Total free OOB size advertised to the MTD framework is:
> 
> ecc.steps * NFC_SYS_DATA_SIZE - 1 BBM
> 8 * 4 - 1 = 31 bytes
> 
> With link address in OOB byte [0..3] this become:
> 31 - 4 = 27 bytes
> 
> Does that give data lost?
> Should we limit the number of free OOB bytes by 4 more to be save?
> Is my calculation correct?

I don't know what link address is, but yes if it's an area used by the
controller for whatever reason it should be left alone, neither "free"
nor "ecc".

> 
> See further questions about this below.
> 
> > +
> > +	if (!section) {
> > +		/* The first byte is bad block mask flag. */
> > +		oob_region->length = NFC_SYS_DATA_SIZE - 1;
> > +		oob_region->offset = 1;
> > +	} else {
> > +		oob_region->length = NFC_SYS_DATA_SIZE;
> > +		oob_region->offset = section * NFC_SYS_DATA_SIZE;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int rk_nfc_ooblayout_ecc(struct mtd_info *mtd, int section,
> > +				struct mtd_oob_region *oob_region)
> > +{
> > +	struct nand_chip *chip = mtd_to_nand(mtd);
> > +  
> 
> > +	if (section)
> > +		return -ERANGE;  
> 
> With the formule above a section > 0 does not alow ECC.
> 
> Just a question about the MTD inner working for Miquel:
> 
> With ooblayout_free using 8 steps and this just 1 does it still generate
> the correct ECC? Does it calculate ECC over 1024B or over 8*1024B ?

These functions do not generate anything and it's just a helper to
retrieve the ECC or free bytes, meaning that if you have 4 ECC bytes
per step, all concatenated, you will end with with an unique  ECC
section of 8 * 4 ECC bytes, this is perfectly fine.

> 
> Should we move the text that explains the layout closer to these
> functions and add a little more text to explain why we choose this
> particular layout?

Yes please.

> 
> /*
>  * NFC Page Data Layout:
>  *	1024 Bytes Data + 4Bytes sys data + 28Bytes~124Bytes ecc +
>  *	1024 Bytes Data + 4Bytes sys data + 28Bytes~124Bytes ecc +
>  *	......
>  * NAND Page Data Layout:
>  *	1024 * n Data + m Bytes oob
>  * Original Bad Block Mask Location:
>  *	First byte of oob(spare).
>  * nand_chip->oob_poi data layout:
>  *	4Bytes sys data + .... + 4Bytes sys data + ecc data.
>  */
> 
> We expect now ECC data after n steps * 4 OOB bytes,

fine

> but are we still using it with HW ECC or only for raw?

both, you need to ensure reading a raw pages gives you a regular
data+ecc organization instead of the NFC's layout.

> 
> > +
> > +	oob_region->offset = NFC_SYS_DATA_SIZE * chip->ecc.steps;
> > +	oob_region->length = mtd->oobsize - oob_region->offset;
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct mtd_ooblayout_ops rk_nfc_ooblayout_ops = {
> > +	.free = rk_nfc_ooblayout_free,
> > +	.ecc = rk_nfc_ooblayout_ecc,
> > +};  
> 
> [..]
> 
> > +static int rk_nfc_write_page(struct mtd_info *mtd, struct nand_chip *chip,
> > +			     const u8 *buf, int page, int raw)
> > +{
> > +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> > +	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
> > +	struct nand_ecc_ctrl *ecc = &chip->ecc;
> > +	int oob_step = (ecc->bytes > 60) ? NFC_MAX_OOB_PER_STEP :
> > +			NFC_MIN_OOB_PER_STEP;
> > +	int pages_per_blk = mtd->erasesize / mtd->writesize;
> > +	int ret = 0, i, boot_rom_mode = 0;
> > +	dma_addr_t dma_data, dma_oob;
> > +	u32 reg;
> > +	u8 *oob;
> > +
> > +	nand_prog_page_begin_op(chip, page, 0, NULL, 0);
> > +
> > +	if (!raw) {
> > +		memcpy(nfc->page_buf, buf, mtd->writesize);
> > +		memset(nfc->oob_buf, 0xff, oob_step * ecc->steps);
> > +
> > +		/*
> > +		 * The first 8(some devices are 4 or 16) blocks in use by
> > +		 * the boot ROM and the first 32 bits of oob need to link
> > +		 * to the next page address in the same block.
> > +		 * Config the ECC algorithm supported by the boot ROM.
> > +		 */
> > +		if (page < pages_per_blk * rk_nand->boot_blks &&
> > +		    chip->options & NAND_IS_BOOT_MEDIUM) {
> > +			boot_rom_mode = 1;
> > +			if (rk_nand->boot_ecc != ecc->strength)
> > +				rk_nfc_hw_ecc_setup(chip, ecc,
> > +						    rk_nand->boot_ecc);
> > +		}
> > +
> > +		/*
> > +		 * Swap the first oob with the seventh oob and bad block
> > +		 * mask is saved at the seventh oob.
> > +		 */
> > +		swap(chip->oob_poi[0], chip->oob_poi[7]);  
> 
> Add more info on why this is swapped.
> 
> LA[0..3] is a link address that the BBM shouldn't over write.
> For Yifeng: Is there an other reason?
> 
> Before swap:
> 
> BBM  OOB1 OOB2 OOB3, OOB4 OOB5 OOB6 OOB7, OOB8 ....
> 
> After swap:
> 
> OOB7 OOB1 OOB2 OOB3, OOB4 OOB5 OOB6 BBM , OOB8 ....
> 
> If (!i && boot_rom_mode):
> 
> LA0  LA1  LA2  LA3 , OOB4 OOB5 OOB6 BBM , OOB8 ....
> 
> Read back after swap again:
> 
> BBM  LA1  LA2  LA3 , OOB4 OOB5 OOB6 LA0 , OOB8 ....
> 
> Question:
> Are data OOB7 OOB1 OOB2 OOB3 lost now?
> Is this correct?
> 
> #################################################
> Proposal:
> Should we reduce the free OOB size by 4
> and shift everything 4 bytes to recover all bytes?
> Replace the first 4 bytes with 0XFF or LA[0..3].
> 
> Normal:
> 0xFF 0XFF 0XFF 0xFF, BBM  OOB1 OOB2 OOB3, OOB4
> 
> If (!i && boot_rom_mode):
> LA0  LA1  LA2  LA3 , BBM  OOB1 OOB2 OOB3, OOB4
> 
> Question for Miquel and Yifeng:
> Does this work? Could you test?
> 
> > +
> > +		for (i = 0; i < ecc->steps; i++) {  
> 
> Just a proposel:
> 
> 		if (!i && boot_rom_mode)
> 			reg = (page & (pages_per_blk - 1)) * 4;
> 		else if (!i)
> 			reg = 0xFFFFFFFF;
> 		else	
> 			oob = chip->oob_poi + (i-1) * NFC_SYS_DATA_SIZE;
> 			reg = oob[0] | oob[1] << 8 | oob[2] << 16 |
> 			      oob[3] << 24;
> 
> > +
> > +			if (nfc->cfg->type == NFC_V6 ||
> > +			    nfc->cfg->type == NFC_V8)
> > +				nfc->oob_buf[i * oob_step / 4] = reg;
> > +			else
> > +				nfc->oob_buf[i] = reg;
> > +		}
> > +
> > +		dma_data = dma_map_single(nfc->dev, (void *)nfc->page_buf,
> > +					  mtd->writesize, DMA_TO_DEVICE);
> > +		dma_oob = dma_map_single(nfc->dev, nfc->oob_buf,
> > +					 ecc->steps * oob_step,
> > +					 DMA_TO_DEVICE);
> > +
> > +		reinit_completion(&nfc->done);
> > +		writel(INT_DMA, nfc->regs + nfc->cfg->int_en_off);
> > +
> > +		rk_nfc_xfer_start(nfc, NFC_WRITE, ecc->steps, dma_data,
> > +				  dma_oob);
> > +		ret = wait_for_completion_timeout(&nfc->done,
> > +						  msecs_to_jiffies(100));
> > +		if (!ret)
> > +			dev_warn(nfc->dev, "write: wait dma done timeout.\n");
> > +		/*
> > +		 * Whether the DMA transfer is completed or not. The driver
> > +		 * needs to check the NFC`s status register to see if the data
> > +		 * transfer was completed.
> > +		 */
> > +		ret = rk_nfc_wait_for_xfer_done(nfc);
> > +
> > +		dma_unmap_single(nfc->dev, dma_data, mtd->writesize,
> > +				 DMA_TO_DEVICE);
> > +		dma_unmap_single(nfc->dev, dma_oob, ecc->steps * oob_step,
> > +				 DMA_TO_DEVICE);
> > +
> > +		if (boot_rom_mode && rk_nand->boot_ecc != ecc->strength)
> > +			rk_nfc_hw_ecc_setup(chip, ecc, ecc->strength);
> > +
> > +		if (ret) {
> > +			ret = -EIO;
> > +			dev_err(nfc->dev,
> > +				 "write: wait transfer done timeout.\n");
> > +		}
> > +	} else {
> > +		rk_nfc_write_buf(chip, buf, mtd->writesize + + mtd->oobsize);  
> 
> Remove a '+'
> 
> > +	}
> > +
> > +	if (ret)
> > +		return ret;
> > +
> > +	ret = nand_prog_page_end_op(chip);
> > +
> > +	/* Deselect the currently selected target. */
> > +	rk_nfc_select_chip(chip, -1);
> > +
> > +	return ret;
> > +}
> > +
> > +static int rk_nfc_write_page_raw(struct nand_chip *chip, const u8 *buf,
> > +				 int oob_on, int page)
> > +{
> > +	struct mtd_info *mtd = nand_to_mtd(chip);
> > +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> > +	u32 i;
> > +
> > +	memset(nfc->buffer, 0xff, mtd->writesize + mtd->oobsize);
> > +	swap(chip->oob_poi[0], chip->oob_poi[7]);
> > +	for (i = 0; i < chip->ecc.steps; i++) {
> > +		if (buf)
> > +			memcpy(rk_data_ptr(chip, i), data_ptr(chip, buf, i),
> > +			       chip->ecc.size);
> > +
> > +		memcpy(rk_oob_ptr(chip, i), oob_ptr(chip, i),
> > +		       NFC_SYS_DATA_SIZE);
> > +	}
> > +
> > +	return rk_nfc_write_page(mtd, chip, nfc->buffer, page, 1);
> > +}
> > +
> > +static int rk_nfc_write_oob_std(struct nand_chip *chip, int page)
> > +{
> > +	return rk_nfc_write_page_raw(chip, NULL, 1, page);
> > +}
> > +
> > +static int rk_nfc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
> > +			    u32 data_offs, u32 readlen,
> > +			    u8 *buf, int page, int raw)
> > +{
> > +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> > +	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
> > +	struct nand_ecc_ctrl *ecc = &chip->ecc;
> > +	int oob_step = (ecc->bytes > 60) ? NFC_MAX_OOB_PER_STEP :
> > +			NFC_MIN_OOB_PER_STEP;
> > +	int pages_per_blk = mtd->erasesize / mtd->writesize;
> > +	dma_addr_t dma_data, dma_oob;
> > +	int ret = 0, i, boot_rom_mode = 0;
> > +	int bitflips = 0, bch_st;
> > +	u8 *oob;
> > +	u32 tmp;
> > +
> > +	nand_read_page_op(chip, page, 0, NULL, 0);
> > +	if (!raw) {
> > +		dma_data = dma_map_single(nfc->dev, nfc->page_buf,
> > +					  mtd->writesize,
> > +					  DMA_FROM_DEVICE);
> > +		dma_oob = dma_map_single(nfc->dev, nfc->oob_buf,
> > +					 ecc->steps * oob_step,
> > +					 DMA_FROM_DEVICE);
> > +
> > +		/*
> > +		 * The first 8(some devices are 4 or 16) blocks in use by
> > +		 * the bootrom.
> > +		 * Config the ECC algorithm supported by the boot ROM.
> > +		 */
> > +		if (page < pages_per_blk * rk_nand->boot_blks &&
> > +		    chip->options & NAND_IS_BOOT_MEDIUM) {
> > +			boot_rom_mode = 1;
> > +			if (rk_nand->boot_ecc != ecc->strength)
> > +				rk_nfc_hw_ecc_setup(chip, ecc,
> > +						    rk_nand->boot_ecc);
> > +		}
> > +
> > +		reinit_completion(&nfc->done);
> > +		writel(INT_DMA, nfc->regs + nfc->cfg->int_en_off);
> > +		rk_nfc_xfer_start(nfc, NFC_READ, ecc->steps, dma_data,
> > +				  dma_oob);
> > +		ret = wait_for_completion_timeout(&nfc->done,
> > +						  msecs_to_jiffies(100));
> > +		if (!ret)
> > +			dev_warn(nfc->dev, "read: wait dma done timeout.\n");
> > +		/*
> > +		 * Whether the DMA transfer is completed or not. The driver
> > +		 * needs to check the NFC`s status register to see if the data
> > +		 * transfer was completed.
> > +		 */
> > +		ret = rk_nfc_wait_for_xfer_done(nfc);
> > +		dma_unmap_single(nfc->dev, dma_data, mtd->writesize,
> > +				 DMA_FROM_DEVICE);
> > +		dma_unmap_single(nfc->dev, dma_oob, ecc->steps * oob_step,
> > +				 DMA_FROM_DEVICE);
> > +
> > +		if (ret) {
> > +			bitflips = -EIO;
> > +			dev_err(nfc->dev,
> > +				 "read: wait transfer done timeout.\n");
> > +			goto out;
> > +		}
> > +
> > +		for (i = 0; i < ecc->steps; i++) {
> > +			oob = chip->oob_poi + i * NFC_SYS_DATA_SIZE;
> > +			if (nfc->cfg->type == NFC_V6 ||
> > +			    nfc->cfg->type == NFC_V8)
> > +				tmp = nfc->oob_buf[i * oob_step / 4];
> > +			else
> > +				tmp = nfc->oob_buf[i];
> > +			*oob++ = (u8)tmp;
> > +			*oob++ = (u8)(tmp >> 8);
> > +			*oob++ = (u8)(tmp >> 16);
> > +			*oob++ = (u8)(tmp >> 24);
> > +		}
> > +
> > +		/*
> > +		 * Swap the first oob with the seventh oob and bad block
> > +		 * mask is saved at the seventh oob.
> > +		 */
> > +		swap(chip->oob_poi[0], chip->oob_poi[7]);
> > +
> > +		for (i = 0; i < ecc->steps / 2; i++) {
> > +			bch_st = readl_relaxed(nfc->regs +
> > +					       nfc->cfg->bch_st_off + i * 4);
> > +			if (bch_st & BIT(nfc->cfg->ecc0.err_flag_bit) ||
> > +			    bch_st & BIT(nfc->cfg->ecc1.err_flag_bit)) {
> > +				mtd->ecc_stats.failed++;
> > +				bitflips = -1;
> > +			} else {
> > +				ret = ECC_ERR_CNT(bch_st, nfc->cfg->ecc0);
> > +				mtd->ecc_stats.corrected += ret;
> > +				bitflips = max_t(u32, bitflips, ret);
> > +
> > +				ret = ECC_ERR_CNT(bch_st, nfc->cfg->ecc1);
> > +				mtd->ecc_stats.corrected += ret;
> > +				bitflips = max_t(u32, bitflips, ret);
> > +			}
> > +		}
> > +out:
> > +		memcpy(buf, nfc->page_buf, mtd->writesize);
> > +
> > +		if (boot_rom_mode && rk_nand->boot_ecc != ecc->strength)
> > +			rk_nfc_hw_ecc_setup(chip, ecc, ecc->strength);
> > +
> > +		if (bitflips < 0)
> > +			dev_err(nfc->dev, "read page: %x ecc error!\n", page);
> > +	} else {
> > +		rk_nfc_read_buf(chip, buf, mtd->writesize + mtd->oobsize);
> > +	}
> > +	/* Deselect the currently selected target. */
> > +	rk_nfc_select_chip(chip, -1);
> > +
> > +	return bitflips;
> > +}
> > +
> > +static int rk_nfc_write_page_hwecc(struct nand_chip *chip, const u8 *buf,
> > +				   int oob_on, int page)
> > +{
> > +	return rk_nfc_write_page(nand_to_mtd(chip), chip, buf, page, 0);
> > +}
> > +
> > +static int rk_nfc_read_page_hwecc(struct nand_chip *chip, u8 *p, int oob_on,
> > +				  int pg)
> > +{
> > +	struct mtd_info *mtd = nand_to_mtd(chip);
> > +
> > +	return rk_nfc_read_page(mtd, chip, 0, mtd->writesize, p, pg, 0);
> > +}
> > +
> > +static int rk_nfc_read_page_raw(struct nand_chip *chip, u8 *buf, int oob_on,
> > +				int page)
> > +{
> > +	struct mtd_info *mtd = nand_to_mtd(chip);
> > +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> > +	int i, ret;
> > +
> > +	ret = rk_nfc_read_page(mtd, chip, 0, mtd->writesize, nfc->buffer,
> > +			       page, 1);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	for (i = 0; i < chip->ecc.steps; i++) {
> > +		memcpy(oob_ptr(chip, i), rk_oob_ptr(chip, i),
> > +		       NFC_SYS_DATA_SIZE);
> > +
> > +		if (buf)
> > +			memcpy(data_ptr(chip, buf, i), rk_data_ptr(chip, i),
> > +			       chip->ecc.size);
> > +	}
> > +	swap(chip->oob_poi[0], chip->oob_poi[7]);
> > +
> > +	return ret;
> > +}  
> 
> [..]




Thanks,
Miquèl

Yifeng Zhao June 15, 2020, 9:34 a.m. UTC | #8

Hi Johan,

Johan Jonker <[e-mail]> wrote on Sat, 13 Jun 2020 15:31:52
+0200:
>Hi Yifeng, Miquel,
>
>Some more comments about swap();
>
>On 6/9/20 9:40 AM, Yifeng Zhao wrote:
>
>[..]
>
>> +static int rk_nfc_ooblayout_free(struct mtd_info *mtd, int section,
>> +	struct mtd_oob_region *oob_region)
>> +{
>> +	struct nand_chip *chip = mtd_to_nand(mtd);
>> +
>
>> +	if (section >= chip->ecc.steps)
>> +	return -ERANGE;
>
>Given:
>
>NFC_SYS_DATA_SIZE = 4
>chip->ecc.steps = 8
>section [0..7]
>
>Total free OOB size advertised to the MTD framework is:
>
>ecc.steps * NFC_SYS_DATA_SIZE - 1 BBM
>8 * 4 - 1 = 31 bytes
>
>With link address in OOB byte [0..3] this become:
>31 - 4 = 27 bytes
>
>Does that give data lost?
>Should we limit the number of free OOB bytes by 4 more to be save?
>Is my calculation correct?
>See further questions about this below.
>
>> +
>> +	if (!section) {
>> +	/* The first byte is bad block mask flag. */
>> +	oob_region->length = NFC_SYS_DATA_SIZE - 1;
>> +	oob_region->offset = 1;
>> +	} else {
>> +	oob_region->length = NFC_SYS_DATA_SIZE;
>> +	oob_region->offset = section * NFC_SYS_DATA_SIZE;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int rk_nfc_ooblayout_ecc(struct mtd_info *mtd, int section,
>> +	struct mtd_oob_region *oob_region)
>> +{
>> +	struct nand_chip *chip = mtd_to_nand(mtd);
>> +
>
>> +	if (section)
>> +	return -ERANGE;
>
>With the formule above a section > 0 does not alow ECC.
>
>Just a question about the MTD inner working for Miquel:
>
>With ooblayout_free using 8 steps and this just 1 does it still generate
>the correct ECC? Does it calculate ECC over 1024B or over 8*1024B ?
>
>Should we move the text that explains the layout closer to these
>functions and add a little more text to explain why we choose this
>particular layout?
>
>/*
> * NFC Page Data Layout:
> *	1024 Bytes Data + 4Bytes sys data + 28Bytes~124Bytes ecc +
> *	1024 Bytes Data + 4Bytes sys data + 28Bytes~124Bytes ecc +
> *	......
> * NAND Page Data Layout:
> *	1024 * n Data + m Bytes oob
> * Original Bad Block Mask Location:
> *	First byte of oob(spare).
> * nand_chip->oob_poi data layout:
> *	4Bytes sys data + .... + 4Bytes sys data + ecc data.
> */
>
>We expect now ECC data after n steps * 4 OOB bytes,
>but are we still using it with HW ECC or only for raw?
>
>> +
>> +	oob_region->offset = NFC_SYS_DATA_SIZE * chip->ecc.steps;
>> +	oob_region->length = mtd->oobsize - oob_region->offset;
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct mtd_ooblayout_ops rk_nfc_ooblayout_ops = {
>> +	.free = rk_nfc_ooblayout_free,
>> +	.ecc = rk_nfc_ooblayout_ecc,
>> +};
>
>[..]
>
>> +static int rk_nfc_write_page(struct mtd_info *mtd, struct nand_chip *chip,
>> +	     const u8 *buf, int page, int raw)
>> +{
>> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
>> +	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
>> +	struct nand_ecc_ctrl *ecc = &chip->ecc;
>> +	int oob_step = (ecc->bytes > 60) ? NFC_MAX_OOB_PER_STEP :
>> +	NFC_MIN_OOB_PER_STEP;
>> +	int pages_per_blk = mtd->erasesize / mtd->writesize;
>> +	int ret = 0, i, boot_rom_mode = 0;
>> +	dma_addr_t dma_data, dma_oob;
>> +	u32 reg;
>> +	u8 *oob;
>> +
>> +	nand_prog_page_begin_op(chip, page, 0, NULL, 0);
>> +
>> +	if (!raw) {
>> +	memcpy(nfc->page_buf, buf, mtd->writesize);
>> +	memset(nfc->oob_buf, 0xff, oob_step * ecc->steps);
>> +
>> +	/*
>> +	* The first 8(some devices are 4 or 16) blocks in use by
>> +	* the boot ROM and the first 32 bits of oob need to link
>> +	* to the next page address in the same block.
>> +	* Config the ECC algorithm supported by the boot ROM.
>> +	*/
>> +	if (page < pages_per_blk * rk_nand->boot_blks &&
>> +	    chip->options & NAND_IS_BOOT_MEDIUM) {
>> +	boot_rom_mode = 1;
>> +	if (rk_nand->boot_ecc != ecc->strength)
>> +	rk_nfc_hw_ecc_setup(chip, ecc,
>> +	    rk_nand->boot_ecc);
>> +	}
>> +
>> +	/*
>> +	* Swap the first oob with the seventh oob and bad block
>> +	* mask is saved at the seventh oob.
>> +	*/
>> +	swap(chip->oob_poi[0], chip->oob_poi[7]);
>
>Add more info on why this is swapped.
>
>LA[0..3] is a link address that the BBM shouldn't over write.
>For Yifeng: Is there an other reason?

No other reason，this swap ops only for the link address.

>Before swap:
>
>BBM  OOB1 OOB2 OOB3, OOB4 OOB5 OOB6 OOB7, OOB8 ....
>
>After swap:
>
>OOB7 OOB1 OOB2 OOB3, OOB4 OOB5 OOB6 BBM , OOB8 ....
>
>If (!i && boot_rom_mode):
>
>LA0  LA1  LA2  LA3 , OOB4 OOB5 OOB6 BBM , OOB8 ....
>
>Read back after swap again:
>
>BBM  LA1  LA2  LA3 , OOB4 OOB5 OOB6 LA0 , OOB8 ....
>
>Question:
>Are data OOB7 OOB1 OOB2 OOB3 lost now?
>Is this correct?

Yes, the data OOB7 OOB1 OOB2 OOB3 will lost in the blocks which used for the boot ROM.

>#################################################
>Proposal:
>Should we reduce the free OOB size by 4
>and shift everything 4 bytes to recover all bytes?
>Replace the first 4 bytes with 0XFF or LA[0..3].
>
>Normal:
>0xFF 0XFF 0XFF 0xFF, BBM  OOB1 OOB2 OOB3, OOB4
>
>If (!i && boot_rom_mode):
>LA0  LA1  LA2  LA3 , BBM  OOB1 OOB2 OOB3, OOB4
>
>Question for Miquel and Yifeng:
>Does this work? Could you test?

I want to modify the drivers in next version:
The data swap ops only done for the blocks which used for the boot ROM，In this way,
the specially processed code will not affect the rest blocks.
For Miquel and Yifeng:
Is this OK？

>> +
>> +	for (i = 0; i < ecc->steps; i++) {
>
>Just a proposel:
>
>	if (!i && boot_rom_mode)
>	reg = (page & (pages_per_blk - 1)) * 4;
>	else if (!i)
>	reg = 0xFFFFFFFF;
>	else
>	oob = chip->oob_poi + (i-1) * NFC_SYS_DATA_SIZE;
>	reg = oob[0] | oob[1] << 8 | oob[2] << 16 |
>	      oob[3] << 24;
>
>> +
>> +	if (nfc->cfg->type == NFC_V6 ||
>> +	    nfc->cfg->type == NFC_V8)
>> +	nfc->oob_buf[i * oob_step / 4] = reg;
>> +	else
>> +	nfc->oob_buf[i] = reg;
>> +	}
>> +
>> +	dma_data = dma_map_single(nfc->dev, (void *)nfc->page_buf,
>> +	  mtd->writesize, DMA_TO_DEVICE);
>> +	dma_oob = dma_map_single(nfc->dev, nfc->oob_buf,
>> +	ecc->steps * oob_step,
>> +	DMA_TO_DEVICE);
>> +
>> +	reinit_completion(&nfc->done);
>> +	writel(INT_DMA, nfc->regs + nfc->cfg->int_en_off);
>> +
>> +	rk_nfc_xfer_start(nfc, NFC_WRITE, ecc->steps, dma_data,
>> +	  dma_oob);
>> +	ret = wait_for_completion_timeout(&nfc->done,
>> +	  msecs_to_jiffies(100));
>> +	if (!ret)
>> +	dev_warn(nfc->dev, "write: wait dma done timeout.\n");
>> +	/*
>> +	* Whether the DMA transfer is completed or not. The driver
>> +	* needs to check the NFC`s status register to see if the data
>> +	* transfer was completed.
>> +	*/
>> +	ret = rk_nfc_wait_for_xfer_done(nfc);
>> +
>> +	dma_unmap_single(nfc->dev, dma_data, mtd->writesize,
>> +	DMA_TO_DEVICE);
>> +	dma_unmap_single(nfc->dev, dma_oob, ecc->steps * oob_step,
>> +	DMA_TO_DEVICE);
>> +
>> +	if (boot_rom_mode && rk_nand->boot_ecc != ecc->strength)
>> +	rk_nfc_hw_ecc_setup(chip, ecc, ecc->strength);
>> +
>> +	if (ret) {
>> +	ret = -EIO;
>> +	dev_err(nfc->dev,
>> +	"write: wait transfer done timeout.\n");
>> +	}
>> +	} else {
>> +	rk_nfc_write_buf(chip, buf, mtd->writesize + + mtd->oobsize);
>
>Remove a '+'
>
>> +	}
>> +
>> +	if (ret)
>> +	return ret;
>> +
>> +	ret = nand_prog_page_end_op(chip);
>> +
>> +	/* Deselect the currently selected target. */
>> +	rk_nfc_select_chip(chip, -1);
>> +
>> +	return ret;
>> +}
>> +
>> +static int rk_nfc_write_page_raw(struct nand_chip *chip, const u8 *buf,
>> +	int oob_on, int page)
>> +{
>> +	struct mtd_info *mtd = nand_to_mtd(chip);
>> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
>> +	u32 i;
>> +
>> +	memset(nfc->buffer, 0xff, mtd->writesize + mtd->oobsize);
>> +	swap(chip->oob_poi[0], chip->oob_poi[7]);
>> +	for (i = 0; i < chip->ecc.steps; i++) {
>> +	if (buf)
>> +	memcpy(rk_data_ptr(chip, i), data_ptr(chip, buf, i),
>> +	       chip->ecc.size);
>> +
>> +	memcpy(rk_oob_ptr(chip, i), oob_ptr(chip, i),
>> +	       NFC_SYS_DATA_SIZE);
>> +	}
>> +
>> +	return rk_nfc_write_page(mtd, chip, nfc->buffer, page, 1);
>> +}
>> +
>> +static int rk_nfc_write_oob_std(struct nand_chip *chip, int page)
>> +{
>> +	return rk_nfc_write_page_raw(chip, NULL, 1, page);
>> +}
>> +
>> +static int rk_nfc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>> +	    u32 data_offs, u32 readlen,
>> +	    u8 *buf, int page, int raw)
>> +{
>> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
>> +	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
>> +	struct nand_ecc_ctrl *ecc = &chip->ecc;
>> +	int oob_step = (ecc->bytes > 60) ? NFC_MAX_OOB_PER_STEP :
>> +	NFC_MIN_OOB_PER_STEP;
>> +	int pages_per_blk = mtd->erasesize / mtd->writesize;
>> +	dma_addr_t dma_data, dma_oob;
>> +	int ret = 0, i, boot_rom_mode = 0;
>> +	int bitflips = 0, bch_st;
>> +	u8 *oob;
>> +	u32 tmp;
>> +
>> +	nand_read_page_op(chip, page, 0, NULL, 0);
>> +	if (!raw) {
>> +	dma_data = dma_map_single(nfc->dev, nfc->page_buf,
>> +	  mtd->writesize,
>> +	  DMA_FROM_DEVICE);
>> +	dma_oob = dma_map_single(nfc->dev, nfc->oob_buf,
>> +	ecc->steps * oob_step,
>> +	DMA_FROM_DEVICE);
>> +
>> +	/*
>> +	* The first 8(some devices are 4 or 16) blocks in use by
>> +	* the bootrom.
>> +	* Config the ECC algorithm supported by the boot ROM.
>> +	*/
>> +	if (page < pages_per_blk * rk_nand->boot_blks &&
>> +	    chip->options & NAND_IS_BOOT_MEDIUM) {
>> +	boot_rom_mode = 1;
>> +	if (rk_nand->boot_ecc != ecc->strength)
>> +	rk_nfc_hw_ecc_setup(chip, ecc,
>> +	    rk_nand->boot_ecc);
>> +	}
>> +
>> +	reinit_completion(&nfc->done);
>> +	writel(INT_DMA, nfc->regs + nfc->cfg->int_en_off);
>> +	rk_nfc_xfer_start(nfc, NFC_READ, ecc->steps, dma_data,
>> +	  dma_oob);
>> +	ret = wait_for_completion_timeout(&nfc->done,
>> +	  msecs_to_jiffies(100));
>> +	if (!ret)
>> +	dev_warn(nfc->dev, "read: wait dma done timeout.\n");
>> +	/*
>> +	* Whether the DMA transfer is completed or not. The driver
>> +	* needs to check the NFC`s status register to see if the data
>> +	* transfer was completed.
>> +	*/
>> +	ret = rk_nfc_wait_for_xfer_done(nfc);
>> +	dma_unmap_single(nfc->dev, dma_data, mtd->writesize,
>> +	DMA_FROM_DEVICE);
>> +	dma_unmap_single(nfc->dev, dma_oob, ecc->steps * oob_step,
>> +	DMA_FROM_DEVICE);
>> +
>> +	if (ret) {
>> +	bitflips = -EIO;
>> +	dev_err(nfc->dev,
>> +	"read: wait transfer done timeout.\n");
>> +	goto out;
>> +	}
>> +
>> +	for (i = 0; i < ecc->steps; i++) {
>> +	oob = chip->oob_poi + i * NFC_SYS_DATA_SIZE;
>> +	if (nfc->cfg->type == NFC_V6 ||
>> +	    nfc->cfg->type == NFC_V8)
>> +	tmp = nfc->oob_buf[i * oob_step / 4];
>> +	else
>> +	tmp = nfc->oob_buf[i];
>> +	*oob++ = (u8)tmp;
>> +	*oob++ = (u8)(tmp >> 8);
>> +	*oob++ = (u8)(tmp >> 16);
>> +	*oob++ = (u8)(tmp >> 24);
>> +	}
>> +
>> +	/*
>> +	* Swap the first oob with the seventh oob and bad block
>> +	* mask is saved at the seventh oob.
>> +	*/
>> +	swap(chip->oob_poi[0], chip->oob_poi[7]);
>> +
>> +	for (i = 0; i < ecc->steps / 2; i++) {
>> +	bch_st = readl_relaxed(nfc->regs +
>> +	       nfc->cfg->bch_st_off + i * 4);
>> +	if (bch_st & BIT(nfc->cfg->ecc0.err_flag_bit) ||
>> +	    bch_st & BIT(nfc->cfg->ecc1.err_flag_bit)) {
>> +	mtd->ecc_stats.failed++;
>> +	bitflips = -1;
>> +	} else {
>> +	ret = ECC_ERR_CNT(bch_st, nfc->cfg->ecc0);
>> +	mtd->ecc_stats.corrected += ret;
>> +	bitflips = max_t(u32, bitflips, ret);
>> +
>> +	ret = ECC_ERR_CNT(bch_st, nfc->cfg->ecc1);
>> +	mtd->ecc_stats.corrected += ret;
>> +	bitflips = max_t(u32, bitflips, ret);
>> +	}
>> +	}
>> +out:
>> +	memcpy(buf, nfc->page_buf, mtd->writesize);
>> +
>> +	if (boot_rom_mode && rk_nand->boot_ecc != ecc->strength)
>> +	rk_nfc_hw_ecc_setup(chip, ecc, ecc->strength);
>> +
>> +	if (bitflips < 0)
>> +	dev_err(nfc->dev, "read page: %x ecc error!\n", page);
>> +	} else {
>> +	rk_nfc_read_buf(chip, buf, mtd->writesize + mtd->oobsize);
>> +	}
>> +	/* Deselect the currently selected target. */
>> +	rk_nfc_select_chip(chip, -1);
>> +
>> +	return bitflips;
>> +}
>> +
>> +static int rk_nfc_write_page_hwecc(struct nand_chip *chip, const u8 *buf,
>> +	   int oob_on, int page)
>> +{
>> +	return rk_nfc_write_page(nand_to_mtd(chip), chip, buf, page, 0);
>> +}
>> +
>> +static int rk_nfc_read_page_hwecc(struct nand_chip *chip, u8 *p, int oob_on,
>> +	  int pg)
>> +{
>> +	struct mtd_info *mtd = nand_to_mtd(chip);
>> +
>> +	return rk_nfc_read_page(mtd, chip, 0, mtd->writesize, p, pg, 0);
>> +}
>> +
>> +static int rk_nfc_read_page_raw(struct nand_chip *chip, u8 *buf, int oob_on,
>> +	int page)
>> +{
>> +	struct mtd_info *mtd = nand_to_mtd(chip);
>> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
>> +	int i, ret;
>> +
>> +	ret = rk_nfc_read_page(mtd, chip, 0, mtd->writesize, nfc->buffer,
>> +	       page, 1);
>> +	if (ret < 0)
>> +	return ret;
>> +
>> +	for (i = 0; i < chip->ecc.steps; i++) {
>> +	memcpy(oob_ptr(chip, i), rk_oob_ptr(chip, i),
>> +	       NFC_SYS_DATA_SIZE);
>> +
>> +	if (buf)
>> +	memcpy(data_ptr(chip, buf, i), rk_data_ptr(chip, i),
>> +	       chip->ecc.size);
>> +	}
>> +	swap(chip->oob_poi[0], chip->oob_poi[7]);
>> +
>> +	return ret;
>> +}
>
>[..]
>
>
>

Miquel Raynal June 15, 2020, 10:18 a.m. UTC | #9

Hi 赵仪峰,

赵仪峰 <[e-mail]> wrote on Mon, 15 Jun 2020 17:34:14
+0800:

> Hi Johan,
> 
> Johan Jonker <[e-mail]> wrote on Sat, 13 Jun 2020 15:31:52
> +0200:
> >Hi Yifeng, Miquel,
> >
> >Some more comments about swap();
> >
> >On 6/9/20 9:40 AM, Yifeng Zhao wrote:
> >
> >[..]
> >  
> >> +static int rk_nfc_ooblayout_free(struct mtd_info *mtd, int section,
> >> +	struct mtd_oob_region *oob_region)
> >> +{
> >> +	struct nand_chip *chip = mtd_to_nand(mtd);
> >> +  
> >  
> >> +	if (section >= chip->ecc.steps)
> >> +	return -ERANGE;  
> >
> >Given:
> >
> >NFC_SYS_DATA_SIZE = 4
> >chip->ecc.steps = 8
> >section [0..7]
> >
> >Total free OOB size advertised to the MTD framework is:
> >
> >ecc.steps * NFC_SYS_DATA_SIZE - 1 BBM
> >8 * 4 - 1 = 31 bytes
> >
> >With link address in OOB byte [0..3] this become:
> >31 - 4 = 27 bytes
> >
> >Does that give data lost?
> >Should we limit the number of free OOB bytes by 4 more to be save?
> >Is my calculation correct?
> >See further questions about this below.
> >  
> >> +
> >> +	if (!section) {
> >> +	/* The first byte is bad block mask flag. */
> >> +	oob_region->length = NFC_SYS_DATA_SIZE - 1;
> >> +	oob_region->offset = 1;
> >> +	} else {
> >> +	oob_region->length = NFC_SYS_DATA_SIZE;
> >> +	oob_region->offset = section * NFC_SYS_DATA_SIZE;
> >> +	}
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +static int rk_nfc_ooblayout_ecc(struct mtd_info *mtd, int section,
> >> +	struct mtd_oob_region *oob_region)
> >> +{
> >> +	struct nand_chip *chip = mtd_to_nand(mtd);
> >> +  
> >  
> >> +	if (section)
> >> +	return -ERANGE;  
> >
> >With the formule above a section > 0 does not alow ECC.
> >
> >Just a question about the MTD inner working for Miquel:
> >
> >With ooblayout_free using 8 steps and this just 1 does it still generate
> >the correct ECC? Does it calculate ECC over 1024B or over 8*1024B ?
> >
> >Should we move the text that explains the layout closer to these
> >functions and add a little more text to explain why we choose this
> >particular layout?
> >
> >/*
> > * NFC Page Data Layout:
> > *	1024 Bytes Data + 4Bytes sys data + 28Bytes~124Bytes ecc +
> > *	1024 Bytes Data + 4Bytes sys data + 28Bytes~124Bytes ecc +
> > *	......
> > * NAND Page Data Layout:
> > *	1024 * n Data + m Bytes oob
> > * Original Bad Block Mask Location:
> > *	First byte of oob(spare).
> > * nand_chip->oob_poi data layout:
> > *	4Bytes sys data + .... + 4Bytes sys data + ecc data.
> > */
> >
> >We expect now ECC data after n steps * 4 OOB bytes,
> >but are we still using it with HW ECC or only for raw?
> >  
> >> +
> >> +	oob_region->offset = NFC_SYS_DATA_SIZE * chip->ecc.steps;
> >> +	oob_region->length = mtd->oobsize - oob_region->offset;
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +static const struct mtd_ooblayout_ops rk_nfc_ooblayout_ops = {
> >> +	.free = rk_nfc_ooblayout_free,
> >> +	.ecc = rk_nfc_ooblayout_ecc,
> >> +};  
> >
> >[..]
> >  
> >> +static int rk_nfc_write_page(struct mtd_info *mtd, struct nand_chip *chip,
> >> +	     const u8 *buf, int page, int raw)
> >> +{
> >> +	struct rk_nfc *nfc = nand_get_controller_data(chip);
> >> +	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
> >> +	struct nand_ecc_ctrl *ecc = &chip->ecc;
> >> +	int oob_step = (ecc->bytes > 60) ? NFC_MAX_OOB_PER_STEP :
> >> +	NFC_MIN_OOB_PER_STEP;
> >> +	int pages_per_blk = mtd->erasesize / mtd->writesize;
> >> +	int ret = 0, i, boot_rom_mode = 0;
> >> +	dma_addr_t dma_data, dma_oob;
> >> +	u32 reg;
> >> +	u8 *oob;
> >> +
> >> +	nand_prog_page_begin_op(chip, page, 0, NULL, 0);
> >> +
> >> +	if (!raw) {
> >> +	memcpy(nfc->page_buf, buf, mtd->writesize);
> >> +	memset(nfc->oob_buf, 0xff, oob_step * ecc->steps);
> >> +
> >> +	/*
> >> +	* The first 8(some devices are 4 or 16) blocks in use by
> >> +	* the boot ROM and the first 32 bits of oob need to link
> >> +	* to the next page address in the same block.
> >> +	* Config the ECC algorithm supported by the boot ROM.
> >> +	*/
> >> +	if (page < pages_per_blk * rk_nand->boot_blks &&
> >> +	    chip->options & NAND_IS_BOOT_MEDIUM) {
> >> +	boot_rom_mode = 1;
> >> +	if (rk_nand->boot_ecc != ecc->strength)
> >> +	rk_nfc_hw_ecc_setup(chip, ecc,
> >> +	    rk_nand->boot_ecc);
> >> +	}
> >> +
> >> +	/*
> >> +	* Swap the first oob with the seventh oob and bad block
> >> +	* mask is saved at the seventh oob.
> >> +	*/
> >> +	swap(chip->oob_poi[0], chip->oob_poi[7]);  
> >
> >Add more info on why this is swapped.
> >
> >LA[0..3] is a link address that the BBM shouldn't over write.
> >For Yifeng: Is there an other reason?  
> 
> No other reason，this swap ops only for the link address.
> 
> >Before swap:
> >
> >BBM  OOB1 OOB2 OOB3, OOB4 OOB5 OOB6 OOB7, OOB8 ....
> >
> >After swap:
> >
> >OOB7 OOB1 OOB2 OOB3, OOB4 OOB5 OOB6 BBM , OOB8 ....
> >
> >If (!i && boot_rom_mode):
> >
> >LA0  LA1  LA2  LA3 , OOB4 OOB5 OOB6 BBM , OOB8 ....
> >
> >Read back after swap again:
> >
> >BBM  LA1  LA2  LA3 , OOB4 OOB5 OOB6 LA0 , OOB8 ....
> >
> >Question:
> >Are data OOB7 OOB1 OOB2 OOB3 lost now?
> >Is this correct?  
> 
> Yes, the data OOB7 OOB1 OOB2 OOB3 will lost in the blocks which used for the boot ROM.
> 
> >#################################################
> >Proposal:
> >Should we reduce the free OOB size by 4
> >and shift everything 4 bytes to recover all bytes?
> >Replace the first 4 bytes with 0XFF or LA[0..3].
> >
> >Normal:
> >0xFF 0XFF 0XFF 0xFF, BBM  OOB1 OOB2 OOB3, OOB4
> >
> >If (!i && boot_rom_mode):
> >LA0  LA1  LA2  LA3 , BBM  OOB1 OOB2 OOB3, OOB4
> >
> >Question for Miquel and Yifeng:
> >Does this work? Could you test?  
> 
> I want to modify the drivers in next version:
> The data swap ops only done for the blocks which used for the boot ROM，In this way,
> the specially processed code will not affect the rest blocks.
> For Miquel and Yifeng:
> Is this OK？

So I guess this linking property is only for the BootROM? I am not sure
what is best but I guess keeping the same layout everywhere is better.
Johan proposal would be good to try.

Thanks,
Miquèl

Patch

diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index a80a46bb5b8b..59e6e2a48ab9 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -433,6 +433,27 @@  config MTD_NAND_MESON
 	  Enables support for NAND controller on Amlogic's Meson SoCs.
 	  This controller is found on Meson SoCs.
 
+config MTD_NAND_ROCKCHIP
+	tristate "Rockchip NAND controller"
+	depends on ARCH_ROCKCHIP || COMPILE_TEST
+	depends on HAS_IOMEM
+	help
+	  Enables support for NAND controller on Rockchip SoCs.
+	  There are four different versions of NAND FLASH Controllers,
+	  including:
+	  - PX30 and RK3326(NFCv900).
+		ECC: 16/40/60/70 bits/1KB.
+		CLOCK: ahb and nfc.
+	  - RK3308 and RV1108(NFCv800).
+		ECC: 16 bits/1KB.
+		CLOCK: ahb and nfc.
+	  - RK3036 and RK3128(NFCv622).
+		ECC: 16/24/40/60 bits/1KB.
+		CLOCK: ahb and nfc.
+	  - RK3066, RK3188 and RK2928(NFCv600).
+		ECC: 16/24/40/60 bits/1KB.
+		CLOCK: ahb.
+
 config MTD_NAND_GPIO
 	tristate "GPIO assisted NAND controller"
 	depends on GPIOLIB || COMPILE_TEST
diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile
index 2d136b158fb7..a54aa85f49b1 100644
--- a/drivers/mtd/nand/raw/Makefile
+++ b/drivers/mtd/nand/raw/Makefile
@@ -58,6 +58,7 @@  obj-$(CONFIG_MTD_NAND_TEGRA)		+= tegra_nand.o
 obj-$(CONFIG_MTD_NAND_STM32_FMC2)	+= stm32_fmc2_nand.o
 obj-$(CONFIG_MTD_NAND_MESON)		+= meson_nand.o
 obj-$(CONFIG_MTD_NAND_CADENCE)		+= cadence-nand-controller.o
+obj-$(CONFIG_MTD_NAND_ROCKCHIP)		+= rockchip-nand-controller.o
 
 nand-objs := nand_base.o nand_legacy.o nand_bbt.o nand_timings.o nand_ids.o
 nand-objs += nand_onfi.o
diff --git a/drivers/mtd/nand/raw/rockchip-nand-controller.c b/drivers/mtd/nand/raw/rockchip-nand-controller.c
new file mode 100644
index 000000000000..3d6cbca3565a
--- /dev/null
+++ b/drivers/mtd/nand/raw/rockchip-nand-controller.c
@@ -0,0 +1,1393 @@ 
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/*
+ * Rockchip NAND Flash controller driver.
+ * Copyright (C) 2020 Rockchip Inc.
+ * Author: Yifeng Zhao <[e-mail]>
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/interrupt.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/rawnand.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+
+/*
+ * NFC Page Data Layout:
+ *	1024 Bytes Data + 4Bytes sys data + 28Bytes~124Bytes ecc +
+ *	1024 Bytes Data + 4Bytes sys data + 28Bytes~124Bytes ecc +
+ *	......
+ * NAND Page Data Layout:
+ *	1024 * n Data + m Bytes oob
+ * Original Bad Block Mask Location:
+ *	First byte of oob(spare).
+ * nand_chip->oob_poi data layout:
+ *	4Bytes sys data + .... + 4Bytes sys data + ecc data.
+ */
+
+/* NAND controller register definition */
+#define	NFC_READ		(0)
+#define	NFC_WRITE		(1)
+#define	NFC_FMCTL		(0x00)
+#define		FMCTL_CE_SEL_M		0xFF
+#define		FMCTL_CE_SEL(x)		(1 << (x))
+#define		FMCTL_WP		BIT(8)
+#define		FMCTL_RDY		BIT(9)
+#define	NFC_FMWAIT		(0x04)
+#define		FLCTL_RST		BIT(0)
+#define		FLCTL_WR		(1)	/* 0: read, 1: write */
+#define		FLCTL_XFER_ST		BIT(2)
+#define		FLCTL_XFER_EN		BIT(3)
+#define		FLCTL_ACORRECT		BIT(10) /* Auto correct error bits. */
+#define		FLCTL_XFER_READY	BIT(20)
+#define		FLCTL_XFER_SECTOR	(22)
+#define		FLCTL_TOG_FIX		BIT(29)
+#define		BCHCTL_BANK_M	(7 << 5)
+#define		BCHCTL_BANK	(5)
+#define		DMA_ST			BIT(0)
+#define		DMA_WR			(1)	/* 0: write, 1: read */
+#define		DMA_EN			BIT(2)
+#define		DMA_AHB_SIZE		(3)	/* 0: 1, 1: 2, 2: 4 */
+#define		DMA_BURST_SIZE		(6)	/* 0: 1, 3: 4, 5: 8, 7: 16 */
+#define		DMA_INC_NUM		(9)	/* 1 - 16 */
+#define		ECC_ERR_CNT(x, e) ((((x) >> (e).low) & (e).low_mask) \
+			| (((x) >> (e).high) & (e).high_mask) << (e).low_bn)
+#define		INT_DMA			BIT(0)
+#define	NFC_BANK		(0x800)
+#define	NFC_BANK_STEP		(0x100)
+#define		BANK_DATA		(0x00)
+#define		BANK_ADDR		(0x04)
+#define		BANK_CMD		(0x08)
+#define	NFC_SRAM0		(0x1000)
+#define	NFC_SRAM1		(0x1400)
+#define	NFC_SRAM_SIZE		(0x400)
+#define	NFC_TIMEOUT		(500000)
+#define	NFC_MAX_OOB_PER_STEP	128
+#define	NFC_MIN_OOB_PER_STEP	64
+#define	MAX_DATA_SIZE		0xFFFC
+#define	MAX_ADDRESS_CYC		6
+#define	NFC_ECC_MAX_MODES	4
+#define	NFC_MAX_NSELS		(8) /* Some Socs only have 1 or 2 CSs. */
+#define	NFC_SYS_DATA_SIZE	(4) /* 4 bytes sys data in oob pre 1024 data.*/
+#define	RK_DEFAULT_CLOCK_RATE	(150 * 1000 * 1000) /* 150 Mhz */
+#define	ACCTIMING(csrw, rwpw, rwcs) ((csrw) << 12 | (rwpw) << 5 | (rwcs))
+
+enum nfc_type {
+	NFC_V6,
+	NFC_V8,
+	NFC_V9,
+};
+
+/**
+ * struct rk_ecc_cnt_status: represent a ecc status data.
+ * @err_flag_bit: error flag bit index at register.
+ * @low: ecc count low bit index at register.
+ * @low_mask: mask bit.
+ * @low_bn: ecc count low bit number.
+ * @high: ecc count high bit index at register.
+ * @high_mask: mask bit
+ */
+struct ecc_cnt_status {
+	u8 err_flag_bit;
+	u8 low;
+	u8 low_mask;
+	u8 low_bn;
+	u8 high;
+	u8 high_mask;
+};
+
+/**
+ * @type: nfc version
+ * @ecc_strengths: ecc strengths
+ * @ecc_cfgs: ecc config values
+ * @flctl_off: FLCTL register offset
+ * @bchctl_off: BCHCTL register offset
+ * @dma_data_buf_off: DMA_DATA_BUF register offset
+ * @dma_oob_buf_off: DMA_OOB_BUF register offset
+ * @dma_cfg_off: DMA_CFG register offset
+ * @dma_st_off: DMA_ST register offset
+ * @bch_st_off: BCG_ST register offset
+ * @randmz_off: RANDMZ register offset
+ * @int_en_off: interrupt enable register offset
+ * @int_clr_off: interrupt clean register offset
+ * @int_st_off: interrupt status register offset
+ * @oob0_off: oob0 register offset
+ * @oob1_off: oob1 register offset
+ * @ecc0: represent ECC0 status data
+ * @ecc1: represent ECC1 status data
+ */
+struct nfc_cfg {
+	enum nfc_type type;
+	u8 ecc_strengths[NFC_ECC_MAX_MODES];
+	u32 ecc_cfgs[NFC_ECC_MAX_MODES];
+	u32 flctl_off;
+	u32 bchctl_off;
+	u32 dma_cfg_off;
+	u32 dma_data_buf_off;
+	u32 dma_oob_buf_off;
+	u32 dma_st_off;
+	u32 bch_st_off;
+	u32 randmz_off;
+	u32 int_en_off;
+	u32 int_clr_off;
+	u32 int_st_off;
+	u32 oob0_off;
+	u32 oob1_off;
+	struct ecc_cnt_status ecc0;
+	struct ecc_cnt_status ecc1;
+};
+
+struct rk_nfc_nand_chip {
+	struct list_head node;
+	struct nand_chip chip;
+
+	u32 spare_per_sector;
+	u32 oob_buf_per_sector;
+	u32 boot_blks;
+	u32 boot_ecc;
+
+	int nsels;
+	u8 sels[0];
+	/* Nothing after this field. */
+};
+
+struct rk_nfc_clk {
+	int nfc_rate;
+	struct clk *nfc_clk;
+	struct clk *ahb_clk;
+};
+
+struct rk_nfc {
+	struct nand_controller controller;
+	struct rk_nfc_clk clk;
+
+	struct device *dev;
+	const struct nfc_cfg *cfg;
+	void __iomem *regs;
+
+	int selected_bank;
+	int band_offset;
+
+	struct completion done;
+	struct list_head chips;
+
+	u8 *buffer;
+	u8 *page_buf;
+	u32 *oob_buf;
+
+	unsigned long assigned_cs;
+};
+
+static inline struct rk_nfc_nand_chip *to_rk_nand(struct nand_chip *chip)
+{
+	return container_of(chip, struct rk_nfc_nand_chip, chip);
+}
+
+static inline u8 *data_ptr(struct nand_chip *chip, const u8 *p, int i)
+{
+	return (u8 *)p + i * chip->ecc.size;
+}
+
+static inline u8 *oob_ptr(struct nand_chip *chip, int i)
+{
+	u8 *poi;
+
+	poi = chip->oob_poi + i * NFC_SYS_DATA_SIZE;
+
+	return poi;
+}
+
+static inline int rk_data_len(struct nand_chip *chip)
+{
+	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
+
+	return chip->ecc.size + rk_nand->spare_per_sector;
+}
+
+static inline u8 *rk_data_ptr(struct nand_chip *chip,  int i)
+{
+	struct rk_nfc *nfc = nand_get_controller_data(chip);
+
+	return nfc->buffer + i * rk_data_len(chip);
+}
+
+static inline u8 *rk_oob_ptr(struct nand_chip *chip, int i)
+{
+	struct rk_nfc *nfc = nand_get_controller_data(chip);
+
+	return nfc->buffer + i * rk_data_len(chip) + chip->ecc.size;
+}
+
+static void rk_nfc_select_chip(struct nand_chip *chip, int cs)
+{
+	struct rk_nfc *nfc = nand_get_controller_data(chip);
+	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
+	u32 val;
+
+	if (cs < 0) {
+		nfc->selected_bank = -1;
+		/* Deselect the currently selected target. */
+		val = readl_relaxed(nfc->regs + NFC_FMCTL);
+		val &= ~FMCTL_CE_SEL_M;
+		writel(val, nfc->regs + NFC_FMCTL);
+		return;
+	}
+
+	nfc->selected_bank = rk_nand->sels[cs];
+	nfc->band_offset = NFC_BANK + nfc->selected_bank * NFC_BANK_STEP;
+
+	val = readl_relaxed(nfc->regs + NFC_FMCTL);
+	val &= ~FMCTL_CE_SEL_M;
+	val |= FMCTL_CE_SEL(nfc->selected_bank);
+
+	writel(val, nfc->regs + NFC_FMCTL);
+}
+
+static inline int rk_nfc_wait_ioready(struct rk_nfc *nfc)
+{
+	int rc;
+	u32 val;
+
+	rc = readl_poll_timeout_atomic(nfc->regs + NFC_FMCTL, val,
+				       val & FMCTL_RDY, 10, NFC_TIMEOUT);
+
+	return rc;
+}
+
+static inline u8 rk_nfc_read_byte(struct nand_chip *chip)
+{
+	struct rk_nfc *nfc = nand_get_controller_data(chip);
+
+	return readb_relaxed(nfc->regs + nfc->band_offset + BANK_DATA);
+}
+
+static void rk_nfc_read_buf(struct nand_chip *chip, u8 *buf, int len)
+{
+	int i;
+
+	for (i = 0; i < len; i++)
+		buf[i] = rk_nfc_read_byte(chip);
+}
+
+static void rk_nfc_write_byte(struct nand_chip *chip, u8 byte)
+{
+	struct rk_nfc *nfc = nand_get_controller_data(chip);
+
+	writeb(byte, nfc->regs + nfc->band_offset + BANK_DATA);
+}
+
+static void rk_nfc_write_buf(struct nand_chip *chip, const u8 *buf, int len)
+{
+	int i;
+
+	for (i = 0; i < len; i++)
+		rk_nfc_write_byte(chip, buf[i]);
+}
+
+static int rk_nfc_cmd(struct nand_chip *chip,
+		      const struct nand_subop *subop)
+{
+	struct rk_nfc *nfc = nand_get_controller_data(chip);
+	unsigned int i, j, remaining, start;
+	int reg_offset = nfc->band_offset;
+	void __iomem *data_reg;
+	u8 *inbuf = NULL;
+	const u8 *outbuf;
+	u32 cnt = 0;
+	int ret = 0;
+
+
+	for (i = 0; i < subop->ninstrs; i++) {
+		const struct nand_op_instr *instr = &subop->instrs[i];
+
+		switch (instr->type) {
+		case NAND_OP_CMD_INSTR:
+			writeb(instr->ctx.cmd.opcode,
+			       nfc->regs + reg_offset + BANK_CMD);
+			break;
+
+		case NAND_OP_ADDR_INSTR:
+			remaining = nand_subop_get_num_addr_cyc(subop, i);
+			start = nand_subop_get_addr_start_off(subop, i);
+
+			for (j = 0; j < 8 && j + start < remaining; j++)
+				writeb(instr->ctx.addr.addrs[j + start],
+				       nfc->regs + reg_offset + BANK_ADDR);
+			break;
+
+		case NAND_OP_DATA_IN_INSTR:
+		case NAND_OP_DATA_OUT_INSTR:
+			start = nand_subop_get_data_start_off(subop, i);
+			cnt = nand_subop_get_data_len(subop, i);
+			data_reg = nfc->regs + nfc->band_offset + BANK_DATA;
+
+			if (instr->type == NAND_OP_DATA_OUT_INSTR) {
+				outbuf = instr->ctx.data.buf.out + start;
+				for (j = 0; j < cnt; j++)
+					writeb(outbuf[j], data_reg);
+			} else {
+				inbuf = instr->ctx.data.buf.in + start;
+				for (j = 0; j < cnt; j++)
+					inbuf[j] = readb_relaxed(data_reg);
+			}
+			break;
+
+		case NAND_OP_WAITRDY_INSTR:
+			if (rk_nfc_wait_ioready(nfc) < 0) {
+				ret = -ETIMEDOUT;
+				dev_err(nfc->dev, "IO not ready\n");
+			}
+			break;
+		}
+	}
+
+	return ret;
+}
+
+static const struct nand_op_parser rk_nfc_op_parser = NAND_OP_PARSER(
+	NAND_OP_PARSER_PATTERN(
+		rk_nfc_cmd,
+		NAND_OP_PARSER_PAT_CMD_ELEM(true),
+		NAND_OP_PARSER_PAT_ADDR_ELEM(true, MAX_ADDRESS_CYC),
+		NAND_OP_PARSER_PAT_CMD_ELEM(true),
+		NAND_OP_PARSER_PAT_WAITRDY_ELEM(true),
+		NAND_OP_PARSER_PAT_DATA_IN_ELEM(true, MAX_DATA_SIZE)),
+	NAND_OP_PARSER_PATTERN(
+		rk_nfc_cmd,
+		NAND_OP_PARSER_PAT_CMD_ELEM(true),
+		NAND_OP_PARSER_PAT_ADDR_ELEM(true, MAX_ADDRESS_CYC),
+		NAND_OP_PARSER_PAT_DATA_OUT_ELEM(true, MAX_DATA_SIZE),
+		NAND_OP_PARSER_PAT_CMD_ELEM(true),
+		NAND_OP_PARSER_PAT_WAITRDY_ELEM(true)),
+);
+
+static int rk_nfc_exec_op(struct nand_chip *chip,
+			  const struct nand_operation *op,
+			  bool check_only)
+{
+	rk_nfc_select_chip(chip, op->cs);
+	return nand_op_parser_exec_op(chip, &rk_nfc_op_parser, op,
+				      check_only);
+}
+
+static int rk_nfc_setup_data_interface(struct nand_chip *chip, int csline,
+				       const struct nand_data_interface *conf)
+{
+	struct rk_nfc *nfc = nand_get_controller_data(chip);
+	const struct nand_sdr_timings *timings;
+	u32 rate, tc2rw, trwpw, trw2c;
+	u32 temp;
+
+	if (csline == NAND_DATA_IFACE_CHECK_ONLY)
+		return 0;
+
+	/* Not onfi nand flash. */
+	if (!chip->parameters.onfi)
+		return 0;
+
+	timings = nand_get_sdr_timings(conf);
+	if (IS_ERR(timings))
+		return -ENOTSUPP;
+
+	if (IS_ERR(nfc->clk.nfc_clk))
+		rate = clk_get_rate(nfc->clk.ahb_clk);
+	else
+		rate = clk_get_rate(nfc->clk.nfc_clk);
+
+	/* Turn clock rate into KHz. */
+	rate /= 1000;
+
+	tc2rw = 1;
+	trw2c = 1;
+
+	trwpw = max(timings->tWC_min, timings->tRC_min) / 1000;
+	trwpw = DIV_ROUND_UP(trwpw * rate, 1000000);
+
+	temp = timings->tREA_max / 1000;
+	temp = DIV_ROUND_UP(temp * rate, 1000000);
+
+	if (trwpw < temp)
+		trwpw = temp;
+
+	/*
+	 * ACCON: access timing control register
+	 * -------------------------------------
+	 * 31:18: reserved
+	 * 17:12: csrw, clock cycles from the falling edge of CSn to the
+		 falling edge of RDn or WRn
+	 * 11:11: reserved
+	 * 10:05: rwpw, the width of RDn or WRn in processor clock cycles
+	 * 04:00: rwcs, clock cycles from the rising edge of RDn or WRn to the
+		 rising edge of CSn
+	 */
+	temp = ACCTIMING(tc2rw, trwpw, trw2c);
+	writel(temp, nfc->regs + NFC_FMWAIT);
+
+	return 0;
+}
+
+static int rk_nfc_hw_ecc_setup(struct nand_chip *chip,
+			       struct nand_ecc_ctrl *ecc,
+			       uint32_t strength)
+{
+	struct rk_nfc *nfc = nand_get_controller_data(chip);
+	u32 reg, i;
+
+	for (i = 0; i < NFC_ECC_MAX_MODES; i++) {
+		if (ecc->strength == nfc->cfg->ecc_strengths[i]) {
+			reg = nfc->cfg->ecc_cfgs[i];
+			break;
+		}
+	}
+
+	if (i >= NFC_ECC_MAX_MODES)
+		return -EINVAL;
+
+	writel(reg, nfc->regs + nfc->cfg->bchctl_off);
+
+	return 0;
+}
+
+static void rk_nfc_xfer_start(struct rk_nfc *nfc, u8 rw, u8 n_KB,
+			      dma_addr_t dma_data, dma_addr_t dma_oob)
+{
+	u32 dma_reg, fl_reg, bch_reg;
+
+	dma_reg = DMA_ST | ((!rw) << DMA_WR)  | DMA_EN | (2 << DMA_AHB_SIZE) |
+	      (7 << DMA_BURST_SIZE) | (16 << DMA_INC_NUM);
+
+	fl_reg = (rw << FLCTL_WR) | FLCTL_XFER_EN | FLCTL_ACORRECT |
+		 (n_KB << FLCTL_XFER_SECTOR) | FLCTL_TOG_FIX;
+
+	if (nfc->cfg->type == NFC_V6 || nfc->cfg->type == NFC_V8) {
+		bch_reg = readl_relaxed(nfc->regs + nfc->cfg->bchctl_off);
+		bch_reg = (bch_reg & (~BCHCTL_BANK_M)) |
+			  (nfc->selected_bank << BCHCTL_BANK);
+		writel(bch_reg, nfc->regs + nfc->cfg->bchctl_off);
+	}
+
+	writel(dma_reg, nfc->regs + nfc->cfg->dma_cfg_off);
+	writel((u32)dma_data, nfc->regs + nfc->cfg->dma_data_buf_off);
+	writel((u32)dma_oob, nfc->regs + nfc->cfg->dma_oob_buf_off);
+	writel(fl_reg, nfc->regs + nfc->cfg->flctl_off);
+	fl_reg |= FLCTL_XFER_ST;
+	writel(fl_reg, nfc->regs + nfc->cfg->flctl_off);
+}
+
+static int rk_nfc_wait_for_xfer_done(struct rk_nfc *nfc)
+{
+	void __iomem *ptr;
+	int ret = 0;
+	u32 reg;
+
+	ptr = nfc->regs + nfc->cfg->flctl_off;
+
+	ret = readl_poll_timeout_atomic(ptr, reg,
+					reg & FLCTL_XFER_READY,
+					10, NFC_TIMEOUT);
+
+	return ret;
+}
+
+static int rk_nfc_write_page(struct mtd_info *mtd, struct nand_chip *chip,
+			     const u8 *buf, int page, int raw)
+{
+	struct rk_nfc *nfc = nand_get_controller_data(chip);
+	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+	int oob_step = (ecc->bytes > 60) ? NFC_MAX_OOB_PER_STEP :
+			NFC_MIN_OOB_PER_STEP;
+	int pages_per_blk = mtd->erasesize / mtd->writesize;
+	int ret = 0, i, boot_rom_mode = 0;
+	dma_addr_t dma_data, dma_oob;
+	u32 reg;
+	u8 *oob;
+
+	nand_prog_page_begin_op(chip, page, 0, NULL, 0);
+
+	if (!raw) {
+		memcpy(nfc->page_buf, buf, mtd->writesize);
+		memset(nfc->oob_buf, 0xff, oob_step * ecc->steps);
+
+		/*
+		 * The first 8(some devices are 4 or 16) blocks in use by
+		 * the boot ROM and the first 32 bits of oob need to link
+		 * to the next page address in the same block.
+		 * Config the ECC algorithm supported by the boot ROM.
+		 */
+		if (page < pages_per_blk * rk_nand->boot_blks &&
+		    chip->options & NAND_IS_BOOT_MEDIUM) {
+			boot_rom_mode = 1;
+			if (rk_nand->boot_ecc != ecc->strength)
+				rk_nfc_hw_ecc_setup(chip, ecc,
+						    rk_nand->boot_ecc);
+		}
+
+		/*
+		 * Swap the first oob with the seventh oob and bad block
+		 * mask is saved at the seventh oob.
+		 */
+		swap(chip->oob_poi[0], chip->oob_poi[7]);
+
+		for (i = 0; i < ecc->steps; i++) {
+			oob = chip->oob_poi + i * NFC_SYS_DATA_SIZE;
+			reg = oob[0] | oob[1] << 8 | oob[2] << 16 |
+			      oob[3] << 24;
+			if (!i && boot_rom_mode)
+				reg = (page & (pages_per_blk - 1)) * 4;
+
+			if (nfc->cfg->type == NFC_V6 ||
+			    nfc->cfg->type == NFC_V8)
+				nfc->oob_buf[i * oob_step / 4] = reg;
+			else
+				nfc->oob_buf[i] = reg;
+		}
+
+		dma_data = dma_map_single(nfc->dev, (void *)nfc->page_buf,
+					  mtd->writesize, DMA_TO_DEVICE);
+		dma_oob = dma_map_single(nfc->dev, nfc->oob_buf,
+					 ecc->steps * oob_step,
+					 DMA_TO_DEVICE);
+
+		reinit_completion(&nfc->done);
+		writel(INT_DMA, nfc->regs + nfc->cfg->int_en_off);
+
+		rk_nfc_xfer_start(nfc, NFC_WRITE, ecc->steps, dma_data,
+				  dma_oob);
+		ret = wait_for_completion_timeout(&nfc->done,
+						  msecs_to_jiffies(100));
+		if (!ret)
+			dev_warn(nfc->dev, "write: wait dma done timeout.\n");
+		/*
+		 * Whether the DMA transfer is completed or not. The driver
+		 * needs to check the NFC`s status register to see if the data
+		 * transfer was completed.
+		 */
+		ret = rk_nfc_wait_for_xfer_done(nfc);
+
+		dma_unmap_single(nfc->dev, dma_data, mtd->writesize,
+				 DMA_TO_DEVICE);
+		dma_unmap_single(nfc->dev, dma_oob, ecc->steps * oob_step,
+				 DMA_TO_DEVICE);
+
+		if (boot_rom_mode && rk_nand->boot_ecc != ecc->strength)
+			rk_nfc_hw_ecc_setup(chip, ecc, ecc->strength);
+
+		if (ret) {
+			ret = -EIO;
+			dev_err(nfc->dev,
+				 "write: wait transfer done timeout.\n");
+		}
+	} else {
+		rk_nfc_write_buf(chip, buf, mtd->writesize + + mtd->oobsize);
+	}
+
+	if (ret)
+		return ret;
+
+	ret = nand_prog_page_end_op(chip);
+
+	/* Deselect the currently selected target. */
+	rk_nfc_select_chip(chip, -1);
+
+	return ret;
+}
+
+static int rk_nfc_write_page_raw(struct nand_chip *chip, const u8 *buf,
+				 int oob_on, int page)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	struct rk_nfc *nfc = nand_get_controller_data(chip);
+	u32 i;
+
+	memset(nfc->buffer, 0xff, mtd->writesize + mtd->oobsize);
+	swap(chip->oob_poi[0], chip->oob_poi[7]);
+	for (i = 0; i < chip->ecc.steps; i++) {
+		if (buf)
+			memcpy(rk_data_ptr(chip, i), data_ptr(chip, buf, i),
+			       chip->ecc.size);
+
+		memcpy(rk_oob_ptr(chip, i), oob_ptr(chip, i),
+		       NFC_SYS_DATA_SIZE);
+	}
+
+	return rk_nfc_write_page(mtd, chip, nfc->buffer, page, 1);
+}
+
+static int rk_nfc_write_oob_std(struct nand_chip *chip, int page)
+{
+	return rk_nfc_write_page_raw(chip, NULL, 1, page);
+}
+
+static int rk_nfc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
+			    u32 data_offs, u32 readlen,
+			    u8 *buf, int page, int raw)
+{
+	struct rk_nfc *nfc = nand_get_controller_data(chip);
+	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+	int oob_step = (ecc->bytes > 60) ? NFC_MAX_OOB_PER_STEP :
+			NFC_MIN_OOB_PER_STEP;
+	int pages_per_blk = mtd->erasesize / mtd->writesize;
+	dma_addr_t dma_data, dma_oob;
+	int ret = 0, i, boot_rom_mode = 0;
+	int bitflips = 0, bch_st;
+	u8 *oob;
+	u32 tmp;
+
+	nand_read_page_op(chip, page, 0, NULL, 0);
+	if (!raw) {
+		dma_data = dma_map_single(nfc->dev, nfc->page_buf,
+					  mtd->writesize,
+					  DMA_FROM_DEVICE);
+		dma_oob = dma_map_single(nfc->dev, nfc->oob_buf,
+					 ecc->steps * oob_step,
+					 DMA_FROM_DEVICE);
+
+		/*
+		 * The first 8(some devices are 4 or 16) blocks in use by
+		 * the bootrom.
+		 * Config the ECC algorithm supported by the boot ROM.
+		 */
+		if (page < pages_per_blk * rk_nand->boot_blks &&
+		    chip->options & NAND_IS_BOOT_MEDIUM) {
+			boot_rom_mode = 1;
+			if (rk_nand->boot_ecc != ecc->strength)
+				rk_nfc_hw_ecc_setup(chip, ecc,
+						    rk_nand->boot_ecc);
+		}
+
+		reinit_completion(&nfc->done);
+		writel(INT_DMA, nfc->regs + nfc->cfg->int_en_off);
+		rk_nfc_xfer_start(nfc, NFC_READ, ecc->steps, dma_data,
+				  dma_oob);
+		ret = wait_for_completion_timeout(&nfc->done,
+						  msecs_to_jiffies(100));
+		if (!ret)
+			dev_warn(nfc->dev, "read: wait dma done timeout.\n");
+		/*
+		 * Whether the DMA transfer is completed or not. The driver
+		 * needs to check the NFC`s status register to see if the data
+		 * transfer was completed.
+		 */
+		ret = rk_nfc_wait_for_xfer_done(nfc);
+		dma_unmap_single(nfc->dev, dma_data, mtd->writesize,
+				 DMA_FROM_DEVICE);
+		dma_unmap_single(nfc->dev, dma_oob, ecc->steps * oob_step,
+				 DMA_FROM_DEVICE);
+
+		if (ret) {
+			bitflips = -EIO;
+			dev_err(nfc->dev,
+				 "read: wait transfer done timeout.\n");
+			goto out;
+		}
+
+		for (i = 0; i < ecc->steps; i++) {
+			oob = chip->oob_poi + i * NFC_SYS_DATA_SIZE;
+			if (nfc->cfg->type == NFC_V6 ||
+			    nfc->cfg->type == NFC_V8)
+				tmp = nfc->oob_buf[i * oob_step / 4];
+			else
+				tmp = nfc->oob_buf[i];
+			*oob++ = (u8)tmp;
+			*oob++ = (u8)(tmp >> 8);
+			*oob++ = (u8)(tmp >> 16);
+			*oob++ = (u8)(tmp >> 24);
+		}
+
+		/*
+		 * Swap the first oob with the seventh oob and bad block
+		 * mask is saved at the seventh oob.
+		 */
+		swap(chip->oob_poi[0], chip->oob_poi[7]);
+
+		for (i = 0; i < ecc->steps / 2; i++) {
+			bch_st = readl_relaxed(nfc->regs +
+					       nfc->cfg->bch_st_off + i * 4);
+			if (bch_st & BIT(nfc->cfg->ecc0.err_flag_bit) ||
+			    bch_st & BIT(nfc->cfg->ecc1.err_flag_bit)) {
+				mtd->ecc_stats.failed++;
+				bitflips = -1;
+			} else {
+				ret = ECC_ERR_CNT(bch_st, nfc->cfg->ecc0);
+				mtd->ecc_stats.corrected += ret;
+				bitflips = max_t(u32, bitflips, ret);
+
+				ret = ECC_ERR_CNT(bch_st, nfc->cfg->ecc1);
+				mtd->ecc_stats.corrected += ret;
+				bitflips = max_t(u32, bitflips, ret);
+			}
+		}
+out:
+		memcpy(buf, nfc->page_buf, mtd->writesize);
+
+		if (boot_rom_mode && rk_nand->boot_ecc != ecc->strength)
+			rk_nfc_hw_ecc_setup(chip, ecc, ecc->strength);
+
+		if (bitflips < 0)
+			dev_err(nfc->dev, "read page: %x ecc error!\n", page);
+	} else {
+		rk_nfc_read_buf(chip, buf, mtd->writesize + mtd->oobsize);
+	}
+	/* Deselect the currently selected target. */
+	rk_nfc_select_chip(chip, -1);
+
+	return bitflips;
+}
+
+static int rk_nfc_write_page_hwecc(struct nand_chip *chip, const u8 *buf,
+				   int oob_on, int page)
+{
+	return rk_nfc_write_page(nand_to_mtd(chip), chip, buf, page, 0);
+}
+
+static int rk_nfc_read_page_hwecc(struct nand_chip *chip, u8 *p, int oob_on,
+				  int pg)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	return rk_nfc_read_page(mtd, chip, 0, mtd->writesize, p, pg, 0);
+}
+
+static int rk_nfc_read_page_raw(struct nand_chip *chip, u8 *buf, int oob_on,
+				int page)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	struct rk_nfc *nfc = nand_get_controller_data(chip);
+	int i, ret;
+
+	ret = rk_nfc_read_page(mtd, chip, 0, mtd->writesize, nfc->buffer,
+			       page, 1);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < chip->ecc.steps; i++) {
+		memcpy(oob_ptr(chip, i), rk_oob_ptr(chip, i),
+		       NFC_SYS_DATA_SIZE);
+
+		if (buf)
+			memcpy(data_ptr(chip, buf, i), rk_data_ptr(chip, i),
+			       chip->ecc.size);
+	}
+	swap(chip->oob_poi[0], chip->oob_poi[7]);
+
+	return ret;
+}
+
+static int rk_nfc_read_oob_std(struct nand_chip *chip, int page)
+{
+	return rk_nfc_read_page_raw(chip, NULL, 1, page);
+}
+
+static inline void rk_nfc_hw_init(struct rk_nfc *nfc)
+{
+	/* Disable flash wp. */
+	writel(FMCTL_WP, nfc->regs + NFC_FMCTL);
+	/* Config default timing 40ns at 150 Mhz nfc clock. */
+	writel(0x1081, nfc->regs + NFC_FMWAIT);
+	/* Disable randomizer and DMA. */
+	writel(0, nfc->regs + nfc->cfg->randmz_off);
+	writel(0, nfc->regs + nfc->cfg->dma_cfg_off);
+	writel(FLCTL_RST, nfc->regs + nfc->cfg->flctl_off);
+}
+
+static irqreturn_t rk_nfc_irq(int irq, void *id)
+{
+	struct rk_nfc *nfc = id;
+	u32 sta, ien;
+
+	sta = readl_relaxed(nfc->regs + nfc->cfg->int_st_off);
+	ien = readl_relaxed(nfc->regs + nfc->cfg->int_en_off);
+
+	if (!(sta & ien))
+		return IRQ_NONE;
+
+	writel(sta, nfc->regs + nfc->cfg->int_clr_off);
+	writel(~sta & ien, nfc->regs + nfc->cfg->int_en_off);
+
+	complete(&nfc->done);
+
+	return IRQ_HANDLED;
+}
+
+static int rk_nfc_enable_clk(struct device *dev, struct rk_nfc_clk *clk)
+{
+	int ret;
+
+	if (!IS_ERR(clk->nfc_clk)) {
+		ret = clk_prepare_enable(clk->nfc_clk);
+		if (ret) {
+			dev_err(dev, "failed to enable nfc clk\n");
+			return ret;
+		}
+	}
+
+	ret = clk_prepare_enable(clk->ahb_clk);
+	if (ret) {
+		dev_err(dev, "failed to enable ahb clk\n");
+		if (!IS_ERR(clk->nfc_clk))
+			clk_disable_unprepare(clk->nfc_clk);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void rk_nfc_disable_clk(struct rk_nfc_clk *clk)
+{
+	if (!IS_ERR(clk->nfc_clk))
+		clk_disable_unprepare(clk->nfc_clk);
+	clk_disable_unprepare(clk->ahb_clk);
+}
+
+static int rk_nfc_ooblayout_free(struct mtd_info *mtd, int section,
+				 struct mtd_oob_region *oob_region)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section >= chip->ecc.steps)
+		return -ERANGE;
+
+	if (!section) {
+		/* The first byte is bad block mask flag. */
+		oob_region->length = NFC_SYS_DATA_SIZE - 1;
+		oob_region->offset = 1;
+	} else {
+		oob_region->length = NFC_SYS_DATA_SIZE;
+		oob_region->offset = section * NFC_SYS_DATA_SIZE;
+	}
+
+	return 0;
+}
+
+static int rk_nfc_ooblayout_ecc(struct mtd_info *mtd, int section,
+				struct mtd_oob_region *oob_region)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	if (section)
+		return -ERANGE;
+
+	oob_region->offset = NFC_SYS_DATA_SIZE * chip->ecc.steps;
+	oob_region->length = mtd->oobsize - oob_region->offset;
+
+	return 0;
+}
+
+static const struct mtd_ooblayout_ops rk_nfc_ooblayout_ops = {
+	.free = rk_nfc_ooblayout_free,
+	.ecc = rk_nfc_ooblayout_ecc,
+};
+
+static int rk_nfc_ecc_init(struct device *dev, struct mtd_info *mtd)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct rk_nfc *nfc = nand_get_controller_data(chip);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+	const u8 *strengths = nfc->cfg->ecc_strengths;
+	u8 max_strength, nfc_max_strength;
+	int i;
+
+	nfc_max_strength = nfc->cfg->ecc_strengths[0];
+	/* If optional dt settings not present. */
+	if (!ecc->size || !ecc->strength ||
+	    ecc->strength > nfc_max_strength) {
+		/* Use datasheet requirements. */
+		ecc->strength = chip->base.eccreq.strength;
+		ecc->size = chip->base.eccreq.step_size;
+
+		/*
+		 * Align eccstrength and eccsize.
+		 * This controller only supports 512 and 1024 sizes.
+		 */
+		if (chip->ecc.size < 1024) {
+			if (mtd->writesize > 512) {
+				chip->ecc.size = 1024;
+				chip->ecc.strength <<= 1;
+			} else {
+				dev_err(dev, "ecc.size not supported\n");
+				return -EINVAL;
+			}
+		} else {
+			chip->ecc.size = 1024;
+		}
+
+		ecc->steps = mtd->writesize / ecc->size;
+
+		/*
+		 * HW ECC always request ECC bytes for 1024 bytes blocks.
+		 * 4 Bytes is oob for sys data.
+		 */
+		max_strength = ((mtd->oobsize / ecc->steps) - 4) * 8 /
+				 fls(8 * 1024);
+		if (max_strength > nfc_max_strength)
+			max_strength = nfc_max_strength;
+
+		for (i = 0; i < 4; i++) {
+			if (max_strength >= strengths[i])
+				break;
+		}
+
+		if (i >= 4) {
+			dev_err(nfc->dev, "unsupported strength\n");
+			return -ENOTSUPP;
+		}
+
+		ecc->strength = strengths[i];
+	}
+	ecc->steps = mtd->writesize / ecc->size;
+	ecc->bytes = DIV_ROUND_UP(ecc->strength * fls(8 * 1024), 8);
+	/* HW ECC always work with even numbers of ECC bytes. */
+	ecc->bytes = ALIGN(ecc->bytes, 2);
+
+	rk_nfc_hw_ecc_setup(chip, ecc, ecc->strength);
+
+	return 0;
+}
+
+static int rk_nfc_attach_chip(struct nand_chip *chip)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	struct device *dev = mtd->dev.parent;
+	struct rk_nfc *nfc = nand_get_controller_data(chip);
+	struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+	int len;
+	int ret;
+
+	if (chip->options & NAND_BUSWIDTH_16) {
+		dev_err(dev, "16 bits bus width not supported");
+		return -EINVAL;
+	}
+
+	if (ecc->mode != NAND_ECC_HW)
+		return 0;
+
+	ret = rk_nfc_ecc_init(dev, mtd);
+	if (ret)
+		return ret;
+	rk_nand->spare_per_sector = ecc->bytes + NFC_SYS_DATA_SIZE;
+
+	/* Check buffer first, avoid duplicate alloc buffer. */
+	if (nfc->buffer)
+		return 0;
+
+	len = mtd->writesize + mtd->oobsize;
+	nfc->buffer = devm_kzalloc(dev, len, GFP_KERNEL | GFP_DMA);
+	if (!nfc->buffer)
+		return -ENOMEM;
+
+	nfc->page_buf = nfc->buffer;
+	len = ecc->steps * NFC_MAX_OOB_PER_STEP;
+	nfc->oob_buf = devm_kzalloc(dev, len, GFP_KERNEL | GFP_DMA);
+	if (!nfc->oob_buf) {
+		devm_kfree(dev, nfc->buffer);
+		nfc->buffer = NULL;
+		nfc->oob_buf = NULL;
+		return -ENOMEM;
+	}
+
+	chip->ecc.write_page_raw = rk_nfc_write_page_raw;
+	chip->ecc.write_page = rk_nfc_write_page_hwecc;
+	chip->ecc.write_oob_raw = rk_nfc_write_oob_std;
+	chip->ecc.write_oob = rk_nfc_write_oob_std;
+
+	chip->ecc.read_page_raw = rk_nfc_read_page_raw;
+	chip->ecc.read_page = rk_nfc_read_page_hwecc;
+	chip->ecc.read_oob_raw = rk_nfc_read_oob_std;
+	chip->ecc.read_oob = rk_nfc_read_oob_std;
+
+	return 0;
+}
+
+static const struct nand_controller_ops rk_nfc_controller_ops = {
+	.attach_chip = rk_nfc_attach_chip,
+	.exec_op = rk_nfc_exec_op,
+	.setup_data_interface = rk_nfc_setup_data_interface,
+};
+
+static int rk_nfc_nand_chip_init(struct device *dev, struct rk_nfc *nfc,
+				 struct device_node *np)
+{
+	struct rk_nfc_nand_chip *nand;
+	struct nand_chip *chip;
+	struct mtd_info *mtd;
+	int nsels;
+	u32 tmp;
+	int ret;
+	int i;
+
+	if (!of_get_property(np, "reg", &nsels))
+		return -ENODEV;
+	nsels /= sizeof(u32);
+	if (!nsels || nsels > NFC_MAX_NSELS) {
+		dev_err(dev, "invalid reg property size %d\n", nsels);
+		return -EINVAL;
+	}
+
+	nand = devm_kzalloc(dev, sizeof(*nand) + nsels * sizeof(u8),
+			    GFP_KERNEL);
+	if (!nand)
+		return -ENOMEM;
+
+	nand->nsels = nsels;
+	for (i = 0; i < nsels; i++) {
+		ret = of_property_read_u32_index(np, "reg", i, &tmp);
+		if (ret) {
+			dev_err(dev, "reg property failure : %d\n", ret);
+			return ret;
+		}
+
+		if (tmp >= NFC_MAX_NSELS) {
+			dev_err(dev, "invalid CS: %u\n", tmp);
+			return -EINVAL;
+		}
+
+		if (test_and_set_bit(tmp, &nfc->assigned_cs)) {
+			dev_err(dev, "CS %u already assigned\n", tmp);
+			return -EINVAL;
+		}
+
+		nand->sels[i] = tmp;
+	}
+
+	chip = &nand->chip;
+	chip->controller = &nfc->controller;
+
+	nand_set_flash_node(chip, np);
+
+	nand_set_controller_data(chip, nfc);
+
+	chip->options |= NAND_USE_BOUNCE_BUFFER | NAND_NO_SUBPAGE_WRITE;
+	chip->bbt_options = NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;
+
+	/* Set default mode in case dt entry is missing. */
+	chip->ecc.mode = NAND_ECC_HW;
+
+	mtd = nand_to_mtd(chip);
+	mtd->owner = THIS_MODULE;
+	mtd->dev.parent = dev;
+
+	if (!mtd->name) {
+		dev_err(nfc->dev, "NAND label property is mandatory\n");
+		return -EINVAL;
+	}
+
+	mtd_set_ooblayout(mtd, &rk_nfc_ooblayout_ops);
+	rk_nfc_hw_init(nfc);
+	ret = nand_scan(chip, nsels);
+	if (ret)
+		return ret;
+
+	if (chip->options & NAND_IS_BOOT_MEDIUM) {
+		ret = of_property_read_u32(np, "rockchip,boot-blks", &tmp);
+		nand->boot_blks = ret ? 0 : tmp;
+
+		ret = of_property_read_u32(np, "rockchip,boot-ecc-strength",
+					   &tmp);
+		nand->boot_ecc = ret ? chip->ecc.strength : tmp;
+	}
+
+	ret = mtd_device_register(mtd, NULL, 0);
+	if (ret) {
+		dev_err(dev, "mtd parse partition error\n");
+		nand_release(chip);
+		return ret;
+	}
+
+	list_add_tail(&nand->node, &nfc->chips);
+
+	return 0;
+}
+
+static int rk_nfc_nand_chips_init(struct device *dev, struct rk_nfc *nfc)
+{
+	struct device_node *np = dev->of_node;
+	struct device_node *nand_np;
+	int ret = -EINVAL;
+	int tmp;
+
+	for_each_child_of_node(np, nand_np) {
+		tmp = rk_nfc_nand_chip_init(dev, nfc, nand_np);
+		if (tmp) {
+			of_node_put(nand_np);
+			return ret;
+		}
+		/* At least one nand chip is initialized. */
+		ret = 0;
+	}
+
+	return ret;
+}
+
+static struct nfc_cfg nfc_v6_cfg = {
+		.type			= NFC_V6,
+		.ecc_strengths		= {60, 40, 24, 16},
+		.ecc_cfgs		= {
+			0x00040011, 0x00040001, 0x00000011, 0x00000001,
+		},
+		.flctl_off		= 0x08,
+		.bchctl_off		= 0x0C,
+		.dma_cfg_off		= 0x10,
+		.dma_data_buf_off	= 0x14,
+		.dma_oob_buf_off	= 0x18,
+		.dma_st_off		= 0x1C,
+		.bch_st_off		= 0x20,
+		.randmz_off		= 0x150,
+		.int_en_off		= 0x16C,
+		.int_clr_off		= 0x170,
+		.int_st_off		= 0x174,
+		.oob0_off		= 0x200,
+		.oob1_off		= 0x230,
+		.ecc0			= {
+			.err_flag_bit	= 2,
+			.low		= 3,
+			.low_mask	= 0x1F,
+			.low_bn		= 5,
+			.high		= 27,
+			.high_mask	= 0x1,
+		},
+		.ecc1			= {
+			.err_flag_bit	= 15,
+			.low		= 16,
+			.low_mask	= 0x1F,
+			.low_bn		= 5,
+			.high		= 29,
+			.high_mask	= 0x1,
+		},
+};
+
+static struct nfc_cfg nfc_v8_cfg = {
+		.type			= NFC_V8,
+		.ecc_strengths		= {16, 16, 16, 16},
+		.ecc_cfgs		= {
+			0x00000001, 0x00000001, 0x00000001, 0x00000001,
+		},
+		.flctl_off		= 0x08,
+		.bchctl_off		= 0x0C,
+		.dma_cfg_off		= 0x10,
+		.dma_data_buf_off	= 0x14,
+		.dma_oob_buf_off	= 0x18,
+		.dma_st_off		= 0x1C,
+		.bch_st_off		= 0x20,
+		.bch_st_off		= 0x20,
+		.randmz_off		= 0x150,
+		.int_en_off		= 0x16C,
+		.int_clr_off		= 0x170,
+		.int_st_off		= 0x174,
+		.oob0_off		= 0x200,
+		.oob1_off		= 0x230,
+		.ecc0			= {
+			.err_flag_bit	= 2,
+			.low		= 3,
+			.low_mask	= 0x1F,
+			.low_bn		= 5,
+			.high		= 27,
+			.high_mask	= 0x1,
+		},
+		.ecc1			= {
+			.err_flag_bit	= 15,
+			.low		= 16,
+			.low_mask	= 0x1F,
+			.low_bn		= 5,
+			.high		= 29,
+			.high_mask	= 0x1,
+		},
+};
+
+static struct nfc_cfg nfc_v9_cfg = {
+		.type			= NFC_V9,
+		.ecc_strengths		= {70, 60, 40, 16},
+		.ecc_cfgs		= {
+			0x00000001, 0x06000001, 0x04000001, 0x02000001,
+		},
+		.flctl_off		= 0x10,
+		.bchctl_off		= 0x20,
+		.dma_cfg_off		= 0x30,
+		.dma_data_buf_off	= 0x34,
+		.dma_oob_buf_off	= 0x38,
+		.dma_st_off		= 0x3C,
+		.bch_st_off		= 0x150,
+		.randmz_off		= 0x208,
+		.int_en_off		= 0x120,
+		.int_clr_off		= 0x124,
+		.int_st_off		= 0x128,
+		.oob0_off		= 0x200,
+		.oob1_off		= 0x204,
+		.ecc0			= {
+			.err_flag_bit	= 2,
+			.low		= 3,
+			.low_mask	= 0x7F,
+			.low_bn		= 7,
+			.high		= 0,
+			.high_mask	= 0x0,
+		},
+		.ecc1			= {
+			.err_flag_bit	= 18,
+			.low		= 19,
+			.low_mask	= 0x7F,
+			.low_bn		= 7,
+			.high		= 0,
+			.high_mask	= 0x0,
+		},
+};
+
+static const struct of_device_id rk_nfc_id_table[] = {
+	{.compatible = "rockchip,px30-nfc",
+		.data = &nfc_v9_cfg },
+	{.compatible = "rockchip,rk2928-nfc",
+		.data = &nfc_v6_cfg },
+	{.compatible = "rockchip,rv1108-nfc",
+		.data = &nfc_v8_cfg },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rk_nfc_id_table);
+
+static int rk_nfc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct rk_nfc *nfc;
+	struct resource *res;
+	int ret, irq;
+
+	nfc = devm_kzalloc(dev, sizeof(*nfc), GFP_KERNEL);
+	if (!nfc)
+		return -ENOMEM;
+
+	nand_controller_init(&nfc->controller);
+	INIT_LIST_HEAD(&nfc->chips);
+	nfc->controller.ops = &rk_nfc_controller_ops;
+
+	nfc->cfg = of_device_get_match_data(dev);
+	nfc->dev = dev;
+
+	init_completion(&nfc->done);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	nfc->regs = devm_ioremap_resource(dev, res);
+	if (IS_ERR(nfc->regs)) {
+		ret = PTR_ERR(nfc->regs);
+		goto release_nfc;
+	}
+
+	nfc->clk.nfc_clk = devm_clk_get(dev, "nfc");
+	if (IS_ERR(nfc->clk.nfc_clk)) {
+		dev_dbg(dev, "no nfc clk\n");
+		/* Some old device, sush as rk3066, has no nfc clk. */
+	}
+
+	nfc->clk.ahb_clk = devm_clk_get(dev, "ahb");
+	if (IS_ERR(nfc->clk.ahb_clk)) {
+		dev_err(dev, "no ahb clk\n");
+		ret = PTR_ERR(nfc->clk.ahb_clk);
+		goto release_nfc;
+	}
+
+	ret = rk_nfc_enable_clk(dev, &nfc->clk);
+	if (ret)
+		goto release_nfc;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(dev, "no nfc irq resource\n");
+		ret = -EINVAL;
+		goto clk_disable;
+	}
+
+	writel(0, nfc->regs + nfc->cfg->int_en_off);
+	ret = devm_request_irq(dev, irq, rk_nfc_irq, 0x0, "rk-nand", nfc);
+	if (ret) {
+		dev_err(dev, "failed to request nfc irq\n");
+		goto clk_disable;
+	}
+
+	platform_set_drvdata(pdev, nfc);
+
+	ret = rk_nfc_nand_chips_init(dev, nfc);
+	if (ret) {
+		dev_err(dev, "failed to init nand chips\n");
+		goto clk_disable;
+	}
+	return 0;
+
+clk_disable:
+	rk_nfc_disable_clk(&nfc->clk);
+release_nfc:
+	return ret;
+}
+
+static int rk_nfc_remove(struct platform_device *pdev)
+{
+	struct rk_nfc *nfc = platform_get_drvdata(pdev);
+	struct rk_nfc_nand_chip *nand;
+
+	while (!list_empty(&nfc->chips)) {
+		nand = list_first_entry(&nfc->chips, struct rk_nfc_nand_chip,
+					node);
+		nand_release(&nand->chip);
+		list_del(&nand->node);
+	}
+
+	rk_nfc_disable_clk(&nfc->clk);
+
+	return 0;
+}
+
+static int __maybe_unused rk_nfc_suspend(struct device *dev)
+{
+	struct rk_nfc *nfc = dev_get_drvdata(dev);
+
+	rk_nfc_disable_clk(&nfc->clk);
+
+	return 0;
+}
+
+static int __maybe_unused rk_nfc_resume(struct device *dev)
+{
+	struct rk_nfc *nfc = dev_get_drvdata(dev);
+	struct rk_nfc_nand_chip *nand;
+	struct nand_chip *chip;
+	int ret;
+	u32 i;
+
+	ret = rk_nfc_enable_clk(dev, &nfc->clk);
+	if (ret)
+		return ret;
+
+	/* Reset NAND chip if VCC was powered off. */
+	list_for_each_entry(nand, &nfc->chips, node) {
+		chip = &nand->chip;
+		for (i = 0; i < nand->nsels; i++)
+			nand_reset(chip, i);
+	}
+
+	return 0;
+}
+
+static const struct dev_pm_ops rk_nfc_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(rk_nfc_suspend, rk_nfc_resume)
+};
+
+static struct platform_driver rk_nfc_driver = {
+	.probe = rk_nfc_probe,
+	.remove = rk_nfc_remove,
+	.driver = {
+		.name = "rockchip-nfc",
+		.of_match_table = rk_nfc_id_table,
+		.pm = &rk_nfc_pm_ops,
+	},
+};
+
+module_platform_driver(rk_nfc_driver);
+
+MODULE_LICENSE("Dual MIT/GPL");
+MODULE_AUTHOR("Yifeng Zhao <[e-mail]>");
+MODULE_DESCRIPTION("Rockchip Nand Flash Controller Driver");
+MODULE_ALIAS("platform:rockchip-nand-controller");