| Message ID | 1389190924-26226-6-git-send-email-b.brezillon@overkiz.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Le 08/01/2014 15:22, Boris BREZILLON a écrit : > Add the sunxi NAND Flash Controller driver. > > Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com> > --- > drivers/mtd/nand/Kconfig | 6 + > drivers/mtd/nand/Makefile | 1 + > drivers/mtd/nand/sunxi_nfc.c | 700 ++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 707 insertions(+) > create mode 100644 drivers/mtd/nand/sunxi_nfc.c > > diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig > index 93ae6a6..784dd42 100644 > --- a/drivers/mtd/nand/Kconfig > +++ b/drivers/mtd/nand/Kconfig > @@ -510,4 +510,10 @@ config MTD_NAND_XWAY > Enables support for NAND Flash chips on Lantiq XWAY SoCs. NAND is attached > to the External Bus Unit (EBU). > > +config MTD_NAND_SUNXI > + tristate "Support for NAND on Allwinner SoCs" > + depends on ARCH_SUNXI > + help > + Enables support for NAND Flash chips on Allwinner SoCs. > + > endif # MTD_NAND > diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile > index 542b568..e8b210d 100644 > --- a/drivers/mtd/nand/Makefile > +++ b/drivers/mtd/nand/Makefile > @@ -49,5 +49,6 @@ obj-$(CONFIG_MTD_NAND_JZ4740) += jz4740_nand.o > obj-$(CONFIG_MTD_NAND_GPMI_NAND) += gpmi-nand/ > obj-$(CONFIG_MTD_NAND_XWAY) += xway_nand.o > obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH) += bcm47xxnflash/ > +obj-$(CONFIG_MTD_NAND_SUNXI) += sunxi_nfc.o > BTW, I recently was one of the sources of a merge issue in the clk subsystem because of unsorted Makefile lines. Shouldn't we try to sort this Makefile too ? > nand-objs := nand_base.o nand_bbt.o > diff --git a/drivers/mtd/nand/sunxi_nfc.c b/drivers/mtd/nand/sunxi_nfc.c > new file mode 100644 > index 0000000..1c7a511 > --- /dev/null > +++ b/drivers/mtd/nand/sunxi_nfc.c > @@ -0,0 +1,700 @@ > +/* > + * Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com> > + * > + * Derived from Qiang Yu work: > + * https://github.com/yuq/sunxi-nfc-mtd > + * Copyright (C) 2013 Qiang Yu <yuq825@gmail.com> > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or > + * (at your option) any later version. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + */ > + > +#include <linux/dma-mapping.h> > +#include <linux/slab.h> > +#include <linux/module.h> > +#include <linux/moduleparam.h> > +#include <linux/platform_device.h> > +#include <linux/of.h> > +#include <linux/of_device.h> > +#include <linux/of_gpio.h> > +#include <linux/of_mtd.h> > +#include <linux/mtd/mtd.h> > +#include <linux/mtd/nand.h> > +#include <linux/mtd/partitions.h> > +#include <linux/clk.h> > +#include <linux/delay.h> > +#include <linux/dmaengine.h> > +#include <linux/gpio.h> > +#include <linux/interrupt.h> > +#include <linux/io.h> > + > +#define NFC_REG_CTL 0x0000 > +#define NFC_REG_ST 0x0004 > +#define NFC_REG_INT 0x0008 > +#define NFC_REG_TIMING_CTL 0x000C > +#define NFC_REG_TIMING_CFG 0x0010 > +#define NFC_REG_ADDR_LOW 0x0014 > +#define NFC_REG_ADDR_HIGH 0x0018 > +#define NFC_REG_SECTOR_NUM 0x001C > +#define NFC_REG_CNT 0x0020 > +#define NFC_REG_CMD 0x0024 > +#define NFC_REG_RCMD_SET 0x0028 > +#define NFC_REG_WCMD_SET 0x002C > +#define NFC_REG_IO_DATA 0x0030 > +#define NFC_REG_ECC_CTL 0x0034 > +#define NFC_REG_ECC_ST 0x0038 > +#define NFC_REG_DEBUG 0x003C > +#define NFC_REG_ECC_CNT0 0x0040 > +#define NFC_REG_ECC_CNT1 0x0044 > +#define NFC_REG_ECC_CNT2 0x0048 > +#define NFC_REG_ECC_CNT3 0x004c > +#define NFC_REG_USER_DATA_BASE 0x0050 > +#define NFC_REG_SPARE_AREA 0x00A0 > +#define NFC_RAM0_BASE 0x0400 > +#define NFC_RAM1_BASE 0x0800 > + > +/*define bit use in NFC_CTL*/ > +#define NFC_EN (1 << 0) > +#define NFC_RESET (1 << 1) > +#define NFC_BUS_WIDYH (1 << 2) > +#define NFC_RB_SEL (1 << 3) > +#define NFC_CE_SEL (7 << 24) > +#define NFC_CE_CTL (1 << 6) > +#define NFC_CE_CTL1 (1 << 7) > +#define NFC_PAGE_SIZE (0xf << 8) > +#define NFC_SAM (1 << 12) > +#define NFC_RAM_METHOD (1 << 14) > +#define NFC_DEBUG_CTL (1 << 31) > + > +/*define bit use in NFC_ST*/ > +#define NFC_RB_B2R (1 << 0) > +#define NFC_CMD_INT_FLAG (1 << 1) > +#define NFC_DMA_INT_FLAG (1 << 2) > +#define NFC_CMD_FIFO_STATUS (1 << 3) > +#define NFC_STA (1 << 4) > +#define NFC_NATCH_INT_FLAG (1 << 5) > +#define NFC_RB_STATE0 (1 << 8) > +#define NFC_RB_STATE1 (1 << 9) > +#define NFC_RB_STATE2 (1 << 10) > +#define NFC_RB_STATE3 (1 << 11) > + > +/*define bit use in NFC_INT*/ > +#define NFC_B2R_INT_ENABLE (1 << 0) > +#define NFC_CMD_INT_ENABLE (1 << 1) > +#define NFC_DMA_INT_ENABLE (1 << 2) > +#define NFC_INT_MASK (NFC_B2R_INT_ENABLE | \ > + NFC_CMD_INT_ENABLE | \ > + NFC_DMA_INT_ENABLE) > + > + > +/*define bit use in NFC_CMD*/ > +#define NFC_CMD_LOW_BYTE (0xff << 0) > +#define NFC_CMD_HIGH_BYTE (0xff << 8) > +#define NFC_ADR_NUM (0x7 << 16) > +#define NFC_SEND_ADR (1 << 19) > +#define NFC_ACCESS_DIR (1 << 20) > +#define NFC_DATA_TRANS (1 << 21) > +#define NFC_SEND_CMD1 (1 << 22) > +#define NFC_WAIT_FLAG (1 << 23) > +#define NFC_SEND_CMD2 (1 << 24) > +#define NFC_SEQ (1 << 25) > +#define NFC_DATA_SWAP_METHOD (1 << 26) > +#define NFC_ROW_AUTO_INC (1 << 27) > +#define NFC_SEND_CMD3 (1 << 28) > +#define NFC_SEND_CMD4 (1 << 29) > +#define NFC_CMD_TYPE (3 << 30) > + > +/* define bit use in NFC_RCMD_SET*/ > +#define NFC_READ_CMD (0xff << 0) > +#define NFC_RANDOM_READ_CMD0 (0xff << 8) > +#define NFC_RANDOM_READ_CMD1 (0xff << 16) > + > +/*define bit use in NFC_WCMD_SET*/ > +#define NFC_PROGRAM_CMD (0xff << 0) > +#define NFC_RANDOM_WRITE_CMD (0xff << 8) > +#define NFC_READ_CMD0 (0xff << 16) > +#define NFC_READ_CMD1 (0xff << 24) > + > +/*define bit use in NFC_ECC_CTL*/ > +#define NFC_ECC_EN (1 << 0) > +#define NFC_ECC_PIPELINE (1 << 3) > +#define NFC_ECC_EXCEPTION (1 << 4) > +#define NFC_ECC_BLOCK_SIZE (1 << 5) > +#define NFC_RANDOM_EN (1 << 9) > +#define NFC_RANDOM_DIRECTION (1 << 10) > +#define NFC_ECC_MODE_SHIFT 12 > +#define NFC_ECC_MODE (0xf << NFC_ECC_MODE_SHIFT) > +#define NFC_RANDOM_SEED (0x7fff << 16) > + > + > + > +enum sunxi_nand_rb_type { > + RB_NONE, > + RB_NATIVE, > + RB_GPIO, > +}; > + > +struct sunxi_nand_rb { > + enum sunxi_nand_rb_type type; > + union { > + int gpio; > + int nativeid; > + } info; > +}; > + > +struct sunxi_nand_chip_sel { > + u8 cs; > + struct sunxi_nand_rb rb; > +}; > + > +#define DEFAULT_NAME_FORMAT "nand@%d" > +#define MAX_NAME_SIZE (sizeof("nand@") + 2) > + > +struct sunxi_nand_chip { > + struct list_head node; > + struct nand_chip nand; > + struct mtd_info mtd; > + char default_name[MAX_NAME_SIZE]; > + unsigned long clk_rate; > + int selected; > + int nsels; > + struct sunxi_nand_chip_sel sels[0]; > +}; > + > +static inline struct sunxi_nand_chip *to_sunxi_nand(struct mtd_info *mtd) > +{ > + return container_of(mtd, struct sunxi_nand_chip, mtd); > +} > + > +struct sunxi_nfc { > + struct nand_hw_control controller; > + void __iomem *regs; > + int irq; > + struct clk *ahb_clk; > + struct clk *sclk; > + unsigned long assigned_cs; > + struct list_head chips; > + struct completion complete; > +}; > + > +static inline struct sunxi_nfc *to_sunxi_nfc(struct nand_hw_control *ctrl) > +{ > + return container_of(ctrl, struct sunxi_nfc, controller); > +} > + > +static irqreturn_t sunxi_nfc_interrupt(int irq, void *dev_id) > +{ > + struct sunxi_nfc *nfc = dev_id; > + u32 st = readl(nfc->regs + NFC_REG_ST); > + u32 ien = readl(nfc->regs + NFC_REG_INT); > + > + if (!(ien & st)) > + return IRQ_NONE; > + > + if ((ien & st) == ien) > + complete(&nfc->complete); > + > + writel(st & NFC_INT_MASK, nfc->regs + NFC_REG_ST); > + writel(~st & ien & NFC_INT_MASK, nfc->regs + NFC_REG_INT); > + > + return IRQ_HANDLED; > +} > + > +static int sunxi_nfc_wait_int(struct sunxi_nfc *nfc, u32 flags, > + unsigned int timeout_ms) > +{ > + init_completion(&nfc->complete); > + > + writel(flags, nfc->regs + NFC_REG_INT); > + if (!timeout_ms) > + wait_for_completion(&nfc->complete); > + else if (!wait_for_completion_timeout(&nfc->complete, > + msecs_to_jiffies(timeout_ms))) > + return -ETIMEDOUT; > + > + return 0; > +} > + > +static int sunxi_nfc_dev_ready(struct mtd_info *mtd) > +{ > + struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(mtd); > + struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller); > + struct sunxi_nand_rb *rb; > + unsigned long timeo = (sunxi_nand->nand.state == FL_ERASING ? 400 : 20); > + int ret; > + > + if (sunxi_nand->selected < 0) > + return 0; > + > + rb = &sunxi_nand->sels[sunxi_nand->selected].rb; > + > + switch (rb->type) { > + case RB_NATIVE: > + ret = !!(readl(nfc->regs + NFC_REG_ST) & > + (NFC_RB_STATE0 << rb->info.nativeid)); > + if (ret) > + break; > + > + sunxi_nfc_wait_int(nfc, NFC_RB_B2R, timeo); > + ret = !!(readl(nfc->regs + NFC_REG_ST) & > + (NFC_RB_STATE0 << rb->info.nativeid)); > + break; > + case RB_GPIO: > + ret = gpio_get_value(rb->info.gpio); > + break; > + case RB_NONE: > + default: > + ret = 0; > + dev_err(&mtd->dev, "cannot check R/B NAND status!"); > + break; > + } > + > + return ret; > +} > + > +static void sunxi_nfc_select_chip(struct mtd_info *mtd, int chip) > +{ > + struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(mtd); > + struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller); > + struct sunxi_nand_chip_sel *sel; > + u32 ctl; > + > + if (chip > 0 && chip >= sunxi_nand->nsels) > + return; > + > + if (chip == sunxi_nand->selected) > + return; > + > + ctl = readl(nfc->regs + NFC_REG_CTL) & > + ~(NFC_CE_SEL | NFC_RB_SEL | NFC_EN); > + > + if (chip >= 0) { > + sel = &sunxi_nand->sels[chip]; > + > + ctl |= (sel->cs << 24) | NFC_EN | > + (((sunxi_nand->nand.page_shift - 10) & 0xf) << 8); > + if (sel->rb.type == RB_NONE) { > + sunxi_nand->nand.dev_ready = NULL; > + } else { > + sunxi_nand->nand.dev_ready = sunxi_nfc_dev_ready; > + if (sel->rb.type == RB_NATIVE) > + ctl |= (sel->rb.info.nativeid << 3); > + } > + } > + > + writel(ctl, nfc->regs + NFC_REG_CTL); > + clk_set_rate(nfc->sclk, sunxi_nand->clk_rate); > + > + sunxi_nand->selected = chip; > +} > + > +static void sunxi_nfc_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) > +{ > + struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(mtd); > + struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller); > + int cnt; > + int offs = 0; > + > + while (len > 0) { > + cnt = len > 1024 ? 1024 : len; > + while ((readl(nfc->regs + NFC_REG_ST) & NFC_CMD_FIFO_STATUS)) > + ; > + writel(cnt, nfc->regs + NFC_REG_CNT); > + writel(NFC_DATA_TRANS | NFC_DATA_SWAP_METHOD | NFC_SEQ, > + nfc->regs + NFC_REG_CMD); > + sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0); > + memcpy_fromio(buf + offs, nfc->regs + NFC_RAM0_BASE, cnt); > + offs += cnt; > + len -= cnt; > + } > +} > + > +static void sunxi_nfc_write_buf(struct mtd_info *mtd, const uint8_t *buf, > + int len) > +{ > + struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(mtd); > + struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller); > + int cnt; > + int offs = 0; > + > + while (len > 0) { > + cnt = len > 1024 ? 1024 : len; > + while ((readl(nfc->regs + NFC_REG_ST) & NFC_CMD_FIFO_STATUS)) > + ; > + writel(cnt, nfc->regs + NFC_REG_CNT); > + memcpy_toio(nfc->regs + NFC_RAM0_BASE, buf + offs, cnt); > + writel(NFC_DATA_TRANS | NFC_DATA_SWAP_METHOD | > + NFC_ACCESS_DIR | NFC_SEQ, nfc->regs + NFC_REG_CMD); > + sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0); > + offs += cnt; > + len -= cnt; > + } > +} > + > +static uint8_t sunxi_nfc_read_byte(struct mtd_info *mtd) > +{ > + uint8_t ret; > + > + sunxi_nfc_read_buf(mtd, &ret, 1); > + > + return ret; > +} > + > +static void sunxi_nfc_cmd_ctrl(struct mtd_info *mtd, int dat, > + unsigned int ctrl) > +{ > + struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(mtd); > + struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller); > + u32 tmp; > + > + while ((readl(nfc->regs + NFC_REG_ST) & NFC_CMD_FIFO_STATUS)) > + ; > + > + if (ctrl & NAND_CTRL_CHANGE) { > + tmp = readl(nfc->regs + NFC_REG_CTL); > + if (ctrl & NAND_NCE) > + tmp |= NFC_CE_CTL; > + else > + tmp &= ~NFC_CE_CTL; > + writel(tmp, nfc->regs + NFC_REG_CTL); > + } > + > + if (dat == NAND_CMD_NONE) > + return; > + > + if (ctrl & NAND_CLE) { > + writel(NFC_SEND_CMD1 | dat, nfc->regs + NFC_REG_CMD); > + } else { > + writel(dat, nfc->regs + NFC_REG_ADDR_LOW); > + writel(NFC_SEND_ADR, nfc->regs + NFC_REG_CMD); > + } > + > + sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0); > +} > + > +static int sunxi_nand_chip_init_timings(struct sunxi_nand_chip *chip, > + struct device_node *np) > +{ > + struct nand_timings timings; > + u32 min_clk_period = 0; > + int ret; > + > + ret = of_get_nand_timings(np, &timings); > + if (ret) > + return ret; > + > + /* NFC timings defined in Allwinner Datasheets */ > + > + /* T1 <=> tCLS */ > + if (timings.tCLS_min > min_clk_period) > + min_clk_period = timings.tCLS_min; > + > + /* T2 <=> tCLH */ > + if (timings.tCLH_min > min_clk_period) > + min_clk_period = timings.tCLH_min; > + > + /* T3 <=> tCS */ > + if (timings.tCS_min > min_clk_period) > + min_clk_period = timings.tCS_min; > + > + /* T4 <=> tCH */ > + if (timings.tCH_min > min_clk_period) > + min_clk_period = timings.tCH_min; > + > + /* T5 <=> tWP */ > + if (timings.tWP_min > min_clk_period) > + min_clk_period = timings.tWP_min; > + > + /* T6 <=> tWH */ > + if (timings.tWH_min > min_clk_period) > + min_clk_period = timings.tWH_min; > + > + /* T7 <=> tALS */ > + if (timings.tALS_min > min_clk_period) > + min_clk_period = timings.tALS_min; > + > + /* T8 <=> tDS */ > + if (timings.tDS_min > min_clk_period) > + min_clk_period = timings.tDS_min; > + > + /* T9 <=> tDH */ > + if (timings.tDH_min > min_clk_period) > + min_clk_period = timings.tDH_min; > + > + /* T10 <=> tRR */ > + if (timings.tRR_min > (min_clk_period * 3)) > + min_clk_period = (timings.tRR_min + 2) / 3; > + > + /* T11 <=> tALH */ > + if (timings.tALH_min > min_clk_period) > + min_clk_period = timings.tALH_min; > + > + /* T12 <=> tRP */ > + if (timings.tRP_min > min_clk_period) > + min_clk_period = timings.tRP_min; > + > + /* T13 <=> tREH */ > + if (timings.tREH_min > min_clk_period) > + min_clk_period = timings.tREH_min; > + > + /* T14 <=> tRC */ > + if (timings.tRC_min > (min_clk_period * 2)) > + min_clk_period = (timings.tRC_min + 1) / 2; > + > + /* T15 <=> tWC */ > + if (timings.tWC_min > (min_clk_period * 2)) > + min_clk_period = (timings.tWC_min + 1) / 2; > + > + > + /* min_clk_period = (NAND-clk-period * 2) */ > + if (!min_clk_period) > + chip->clk_rate = 20000000; > + else > + chip->clk_rate = (2 * 1000000000) / min_clk_period; > + > + /* TODO: configure T16-T19 */ > + > + return 0; > +} > + > +static int sunxi_nand_chip_init(struct device *dev, struct sunxi_nfc *nfc, > + struct device_node *np) > +{ > + struct sunxi_nand_chip *chip; > + struct mtd_part_parser_data ppdata; > + struct mtd_info *mtd; > + struct nand_chip *nand; > + int nsels; > + int ret; > + int i; > + u32 tmp; > + > + if (!of_get_property(np, "reg", &nsels)) > + return -EINVAL; > + > + nsels /= sizeof(u32); > + if (!nsels) > + return -EINVAL; > + > + chip = devm_kzalloc(dev, > + sizeof(*chip) + > + (nsels * sizeof(struct sunxi_nand_chip_sel)), > + GFP_KERNEL); > + if (!chip) > + return -ENOMEM; > + > + chip->nsels = nsels; > + chip->selected = -1; > + > + for (i = 0; i < nsels; i++) { > + ret = of_property_read_u32_index(np, "reg", i, &tmp); > + if (ret) > + return ret; > + > + if (tmp > 7) > + return -EINVAL; > + > + if (test_and_set_bit(tmp, &nfc->assigned_cs)) > + return -EINVAL; > + > + chip->sels[i].cs = tmp; > + > + if (!of_property_read_u32_index(np, "allwinner,rb", i, &tmp) && > + tmp < 2) { > + chip->sels[i].rb.type = RB_NATIVE; > + chip->sels[i].rb.info.nativeid = tmp; > + } else { > + ret = of_get_named_gpio(np, "rb-gpios", i); > + if (ret >= 0) { > + chip->sels[i].rb.type = RB_GPIO; > + chip->sels[i].rb.info.gpio = tmp; > + ret = devm_gpio_request(dev, tmp, "nand-rb"); > + if (ret) > + return ret; > + } else { > + chip->sels[i].rb.type = RB_NONE; > + } > + } > + } > + > + ret = sunxi_nand_chip_init_timings(chip, np); > + if (ret) > + return ret; > + > + nand = &chip->nand; > + nand->IO_ADDR_R = nand->IO_ADDR_W = nfc->regs + NFC_REG_IO_DATA; > + nand->controller = &nfc->controller; > + nand->select_chip = sunxi_nfc_select_chip; > + nand->cmd_ctrl = sunxi_nfc_cmd_ctrl; > + nand->read_buf = sunxi_nfc_read_buf; > + nand->write_buf = sunxi_nfc_write_buf; > + nand->read_byte = sunxi_nfc_read_byte; > + > + nand->ecc.mode = of_get_nand_ecc_mode(np); > + if (of_get_nand_on_flash_bbt(np)) > + nand->bbt_options |= NAND_BBT_USE_FLASH; > + > + mtd = &chip->mtd; > + mtd->priv = nand; > + mtd->owner = THIS_MODULE; > + > + ret = nand_scan_ident(mtd, nsels, NULL); > + if (ret) > + return ret; > + > + if (nand->ecc.mode == NAND_ECC_SOFT_BCH) { > + nand->ecc.size = nand->ecc_step_ds; > + nand->ecc.bytes = (((nand->ecc_strength_ds * > + fls(8 * nand->ecc_step_ds)) + 7) / 8); > + } > + > + ret = nand_scan_tail(mtd); > + if (ret) > + return ret; > + > + if (of_property_read_string(np, "nand-name", &mtd->name)) { > + snprintf(chip->default_name, MAX_NAME_SIZE, > + DEFAULT_NAME_FORMAT, chip->sels[i].cs); > + mtd->name = chip->default_name; > + } > + > + ppdata.of_node = np; > + ret = mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0); > + if (!ret) > + return ret; > + > + list_add_tail(&chip->node, &nfc->chips); > + > + return 0; > +} > + > +static int sunxi_nand_chips_init(struct device *dev, struct sunxi_nfc *nfc) > +{ > + struct device_node *np = dev->of_node; > + struct device_node *nand_np; > + int nchips = of_get_child_count(np); > + int ret; > + > + if (nchips > 8) > + return -EINVAL; > + > + for_each_child_of_node(np, nand_np) { > + ret = sunxi_nand_chip_init(dev, nfc, nand_np); > + if (ret) > + return ret; > + } > + > + return 0; > +} > + > +static int sunxi_nfc_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct resource *r; > + struct sunxi_nfc *nfc; > + int ret; > + > + nfc = devm_kzalloc(dev, sizeof(*nfc), GFP_KERNEL); > + if (!nfc) { > + dev_err(dev, "failed to allocate NFC struct\n"); > + return -ENOMEM; > + } > + > + spin_lock_init(&nfc->controller.lock); > + init_waitqueue_head(&nfc->controller.wq); > + INIT_LIST_HEAD(&nfc->chips); > + > + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + nfc->regs = devm_ioremap_resource(dev, r); > + if (IS_ERR(nfc->regs)) { > + dev_err(dev, "failed to remap iomem\n"); > + return PTR_ERR(nfc->regs); > + } > + > + nfc->irq = platform_get_irq(pdev, 0); > + if (nfc->irq < 0) { > + dev_err(dev, "failed to retrieve irq\n"); > + return nfc->irq; > + } > + > + nfc->ahb_clk = devm_clk_get(dev, "ahb_clk"); > + if (IS_ERR(nfc->ahb_clk)) { > + dev_err(dev, "failed to retrieve ahb_clk\n"); > + return PTR_ERR(nfc->ahb_clk); > + } > + > + ret = clk_prepare_enable(nfc->ahb_clk); > + if (ret) > + return ret; > + > + nfc->sclk = devm_clk_get(dev, "sclk"); > + if (IS_ERR(nfc->sclk)) { > + dev_err(dev, "failed to retrieve nand_clk\n"); > + ret = PTR_ERR(nfc->sclk); > + goto out_ahb_clk_unprepare; > + } > + > + ret = clk_prepare_enable(nfc->sclk); > + if (ret) > + goto out_ahb_clk_unprepare; > + > + /* Reset NFC */ > + writel(readl(nfc->regs + NFC_REG_CTL) | NFC_RESET, > + nfc->regs + NFC_REG_CTL); > + while (readl(nfc->regs + NFC_REG_CTL) & NFC_RESET) > + ; > + > + writel(0, nfc->regs + NFC_REG_INT); > + ret = devm_request_irq(dev, nfc->irq, sunxi_nfc_interrupt, > + 0, "sunxi-nfc", nfc); > + if (ret) > + goto out_sclk_unprepare; > + > + platform_set_drvdata(pdev, nfc); > + > + writel(0x100, nfc->regs + NFC_REG_TIMING_CTL); > + writel(0x7ff, nfc->regs + NFC_REG_TIMING_CFG); > + > + ret = sunxi_nand_chips_init(dev, nfc); > + if (ret) { > + dev_err(dev, "failed to init nand chips\n"); > + goto out_sclk_unprepare; > + } > + > + return 0; > + > +out_sclk_unprepare: > + clk_disable_unprepare(nfc->sclk); > +out_ahb_clk_unprepare: > + clk_disable_unprepare(nfc->ahb_clk); > + > + return ret; > +} > + > +static const struct of_device_id sunxi_nfc_ids[] = { > + { .compatible = "allwinner,sun4i-nfc" }, > + { /* sentinel */ } > +}; > +MODULE_DEVICE_TABLE(of, sunxi_nfc_ids); > + > +static struct platform_driver sunxi_nfc_driver = { > + .driver = { > + .name = "sunxi_nfc", > + .owner = THIS_MODULE, > + .of_match_table = of_match_ptr(sunxi_nfc_ids), > + }, > + .probe = sunxi_nfc_probe, > +}; > +module_platform_driver(sunxi_nfc_driver); > + > +MODULE_LICENSE("GPL v2"); > +MODULE_AUTHOR("Boris BREZILLON"); > +MODULE_DESCRIPTION("Allwinner NAND Flash Controller driver"); > +MODULE_ALIAS("platform:sunxi_nfc");
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig index 93ae6a6..784dd42 100644 --- a/drivers/mtd/nand/Kconfig +++ b/drivers/mtd/nand/Kconfig @@ -510,4 +510,10 @@ config MTD_NAND_XWAY Enables support for NAND Flash chips on Lantiq XWAY SoCs. NAND is attached to the External Bus Unit (EBU). +config MTD_NAND_SUNXI + tristate "Support for NAND on Allwinner SoCs" + depends on ARCH_SUNXI + help + Enables support for NAND Flash chips on Allwinner SoCs. + endif # MTD_NAND diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile index 542b568..e8b210d 100644 --- a/drivers/mtd/nand/Makefile +++ b/drivers/mtd/nand/Makefile @@ -49,5 +49,6 @@ obj-$(CONFIG_MTD_NAND_JZ4740) += jz4740_nand.o obj-$(CONFIG_MTD_NAND_GPMI_NAND) += gpmi-nand/ obj-$(CONFIG_MTD_NAND_XWAY) += xway_nand.o obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH) += bcm47xxnflash/ +obj-$(CONFIG_MTD_NAND_SUNXI) += sunxi_nfc.o nand-objs := nand_base.o nand_bbt.o diff --git a/drivers/mtd/nand/sunxi_nfc.c b/drivers/mtd/nand/sunxi_nfc.c new file mode 100644 index 0000000..1c7a511 --- /dev/null +++ b/drivers/mtd/nand/sunxi_nfc.c @@ -0,0 +1,700 @@ +/* + * Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com> + * + * Derived from Qiang Yu work: + * https://github.com/yuq/sunxi-nfc-mtd + * Copyright (C) 2013 Qiang Yu <yuq825@gmail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/dma-mapping.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/platform_device.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_gpio.h> +#include <linux/of_mtd.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/nand.h> +#include <linux/mtd/partitions.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/gpio.h> +#include <linux/interrupt.h> +#include <linux/io.h> + +#define NFC_REG_CTL 0x0000 +#define NFC_REG_ST 0x0004 +#define NFC_REG_INT 0x0008 +#define NFC_REG_TIMING_CTL 0x000C +#define NFC_REG_TIMING_CFG 0x0010 +#define NFC_REG_ADDR_LOW 0x0014 +#define NFC_REG_ADDR_HIGH 0x0018 +#define NFC_REG_SECTOR_NUM 0x001C +#define NFC_REG_CNT 0x0020 +#define NFC_REG_CMD 0x0024 +#define NFC_REG_RCMD_SET 0x0028 +#define NFC_REG_WCMD_SET 0x002C +#define NFC_REG_IO_DATA 0x0030 +#define NFC_REG_ECC_CTL 0x0034 +#define NFC_REG_ECC_ST 0x0038 +#define NFC_REG_DEBUG 0x003C +#define NFC_REG_ECC_CNT0 0x0040 +#define NFC_REG_ECC_CNT1 0x0044 +#define NFC_REG_ECC_CNT2 0x0048 +#define NFC_REG_ECC_CNT3 0x004c +#define NFC_REG_USER_DATA_BASE 0x0050 +#define NFC_REG_SPARE_AREA 0x00A0 +#define NFC_RAM0_BASE 0x0400 +#define NFC_RAM1_BASE 0x0800 + +/*define bit use in NFC_CTL*/ +#define NFC_EN (1 << 0) +#define NFC_RESET (1 << 1) +#define NFC_BUS_WIDYH (1 << 2) +#define NFC_RB_SEL (1 << 3) +#define NFC_CE_SEL (7 << 24) +#define NFC_CE_CTL (1 << 6) +#define NFC_CE_CTL1 (1 << 7) +#define NFC_PAGE_SIZE (0xf << 8) +#define NFC_SAM (1 << 12) +#define NFC_RAM_METHOD (1 << 14) +#define NFC_DEBUG_CTL (1 << 31) + +/*define bit use in NFC_ST*/ +#define NFC_RB_B2R (1 << 0) +#define NFC_CMD_INT_FLAG (1 << 1) +#define NFC_DMA_INT_FLAG (1 << 2) +#define NFC_CMD_FIFO_STATUS (1 << 3) +#define NFC_STA (1 << 4) +#define NFC_NATCH_INT_FLAG (1 << 5) +#define NFC_RB_STATE0 (1 << 8) +#define NFC_RB_STATE1 (1 << 9) +#define NFC_RB_STATE2 (1 << 10) +#define NFC_RB_STATE3 (1 << 11) + +/*define bit use in NFC_INT*/ +#define NFC_B2R_INT_ENABLE (1 << 0) +#define NFC_CMD_INT_ENABLE (1 << 1) +#define NFC_DMA_INT_ENABLE (1 << 2) +#define NFC_INT_MASK (NFC_B2R_INT_ENABLE | \ + NFC_CMD_INT_ENABLE | \ + NFC_DMA_INT_ENABLE) + + +/*define bit use in NFC_CMD*/ +#define NFC_CMD_LOW_BYTE (0xff << 0) +#define NFC_CMD_HIGH_BYTE (0xff << 8) +#define NFC_ADR_NUM (0x7 << 16) +#define NFC_SEND_ADR (1 << 19) +#define NFC_ACCESS_DIR (1 << 20) +#define NFC_DATA_TRANS (1 << 21) +#define NFC_SEND_CMD1 (1 << 22) +#define NFC_WAIT_FLAG (1 << 23) +#define NFC_SEND_CMD2 (1 << 24) +#define NFC_SEQ (1 << 25) +#define NFC_DATA_SWAP_METHOD (1 << 26) +#define NFC_ROW_AUTO_INC (1 << 27) +#define NFC_SEND_CMD3 (1 << 28) +#define NFC_SEND_CMD4 (1 << 29) +#define NFC_CMD_TYPE (3 << 30) + +/* define bit use in NFC_RCMD_SET*/ +#define NFC_READ_CMD (0xff << 0) +#define NFC_RANDOM_READ_CMD0 (0xff << 8) +#define NFC_RANDOM_READ_CMD1 (0xff << 16) + +/*define bit use in NFC_WCMD_SET*/ +#define NFC_PROGRAM_CMD (0xff << 0) +#define NFC_RANDOM_WRITE_CMD (0xff << 8) +#define NFC_READ_CMD0 (0xff << 16) +#define NFC_READ_CMD1 (0xff << 24) + +/*define bit use in NFC_ECC_CTL*/ +#define NFC_ECC_EN (1 << 0) +#define NFC_ECC_PIPELINE (1 << 3) +#define NFC_ECC_EXCEPTION (1 << 4) +#define NFC_ECC_BLOCK_SIZE (1 << 5) +#define NFC_RANDOM_EN (1 << 9) +#define NFC_RANDOM_DIRECTION (1 << 10) +#define NFC_ECC_MODE_SHIFT 12 +#define NFC_ECC_MODE (0xf << NFC_ECC_MODE_SHIFT) +#define NFC_RANDOM_SEED (0x7fff << 16) + + + +enum sunxi_nand_rb_type { + RB_NONE, + RB_NATIVE, + RB_GPIO, +}; + +struct sunxi_nand_rb { + enum sunxi_nand_rb_type type; + union { + int gpio; + int nativeid; + } info; +}; + +struct sunxi_nand_chip_sel { + u8 cs; + struct sunxi_nand_rb rb; +}; + +#define DEFAULT_NAME_FORMAT "nand@%d" +#define MAX_NAME_SIZE (sizeof("nand@") + 2) + +struct sunxi_nand_chip { + struct list_head node; + struct nand_chip nand; + struct mtd_info mtd; + char default_name[MAX_NAME_SIZE]; + unsigned long clk_rate; + int selected; + int nsels; + struct sunxi_nand_chip_sel sels[0]; +}; + +static inline struct sunxi_nand_chip *to_sunxi_nand(struct mtd_info *mtd) +{ + return container_of(mtd, struct sunxi_nand_chip, mtd); +} + +struct sunxi_nfc { + struct nand_hw_control controller; + void __iomem *regs; + int irq; + struct clk *ahb_clk; + struct clk *sclk; + unsigned long assigned_cs; + struct list_head chips; + struct completion complete; +}; + +static inline struct sunxi_nfc *to_sunxi_nfc(struct nand_hw_control *ctrl) +{ + return container_of(ctrl, struct sunxi_nfc, controller); +} + +static irqreturn_t sunxi_nfc_interrupt(int irq, void *dev_id) +{ + struct sunxi_nfc *nfc = dev_id; + u32 st = readl(nfc->regs + NFC_REG_ST); + u32 ien = readl(nfc->regs + NFC_REG_INT); + + if (!(ien & st)) + return IRQ_NONE; + + if ((ien & st) == ien) + complete(&nfc->complete); + + writel(st & NFC_INT_MASK, nfc->regs + NFC_REG_ST); + writel(~st & ien & NFC_INT_MASK, nfc->regs + NFC_REG_INT); + + return IRQ_HANDLED; +} + +static int sunxi_nfc_wait_int(struct sunxi_nfc *nfc, u32 flags, + unsigned int timeout_ms) +{ + init_completion(&nfc->complete); + + writel(flags, nfc->regs + NFC_REG_INT); + if (!timeout_ms) + wait_for_completion(&nfc->complete); + else if (!wait_for_completion_timeout(&nfc->complete, + msecs_to_jiffies(timeout_ms))) + return -ETIMEDOUT; + + return 0; +} + +static int sunxi_nfc_dev_ready(struct mtd_info *mtd) +{ + struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(mtd); + struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller); + struct sunxi_nand_rb *rb; + unsigned long timeo = (sunxi_nand->nand.state == FL_ERASING ? 400 : 20); + int ret; + + if (sunxi_nand->selected < 0) + return 0; + + rb = &sunxi_nand->sels[sunxi_nand->selected].rb; + + switch (rb->type) { + case RB_NATIVE: + ret = !!(readl(nfc->regs + NFC_REG_ST) & + (NFC_RB_STATE0 << rb->info.nativeid)); + if (ret) + break; + + sunxi_nfc_wait_int(nfc, NFC_RB_B2R, timeo); + ret = !!(readl(nfc->regs + NFC_REG_ST) & + (NFC_RB_STATE0 << rb->info.nativeid)); + break; + case RB_GPIO: + ret = gpio_get_value(rb->info.gpio); + break; + case RB_NONE: + default: + ret = 0; + dev_err(&mtd->dev, "cannot check R/B NAND status!"); + break; + } + + return ret; +} + +static void sunxi_nfc_select_chip(struct mtd_info *mtd, int chip) +{ + struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(mtd); + struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller); + struct sunxi_nand_chip_sel *sel; + u32 ctl; + + if (chip > 0 && chip >= sunxi_nand->nsels) + return; + + if (chip == sunxi_nand->selected) + return; + + ctl = readl(nfc->regs + NFC_REG_CTL) & + ~(NFC_CE_SEL | NFC_RB_SEL | NFC_EN); + + if (chip >= 0) { + sel = &sunxi_nand->sels[chip]; + + ctl |= (sel->cs << 24) | NFC_EN | + (((sunxi_nand->nand.page_shift - 10) & 0xf) << 8); + if (sel->rb.type == RB_NONE) { + sunxi_nand->nand.dev_ready = NULL; + } else { + sunxi_nand->nand.dev_ready = sunxi_nfc_dev_ready; + if (sel->rb.type == RB_NATIVE) + ctl |= (sel->rb.info.nativeid << 3); + } + } + + writel(ctl, nfc->regs + NFC_REG_CTL); + clk_set_rate(nfc->sclk, sunxi_nand->clk_rate); + + sunxi_nand->selected = chip; +} + +static void sunxi_nfc_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) +{ + struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(mtd); + struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller); + int cnt; + int offs = 0; + + while (len > 0) { + cnt = len > 1024 ? 1024 : len; + while ((readl(nfc->regs + NFC_REG_ST) & NFC_CMD_FIFO_STATUS)) + ; + writel(cnt, nfc->regs + NFC_REG_CNT); + writel(NFC_DATA_TRANS | NFC_DATA_SWAP_METHOD | NFC_SEQ, + nfc->regs + NFC_REG_CMD); + sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0); + memcpy_fromio(buf + offs, nfc->regs + NFC_RAM0_BASE, cnt); + offs += cnt; + len -= cnt; + } +} + +static void sunxi_nfc_write_buf(struct mtd_info *mtd, const uint8_t *buf, + int len) +{ + struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(mtd); + struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller); + int cnt; + int offs = 0; + + while (len > 0) { + cnt = len > 1024 ? 1024 : len; + while ((readl(nfc->regs + NFC_REG_ST) & NFC_CMD_FIFO_STATUS)) + ; + writel(cnt, nfc->regs + NFC_REG_CNT); + memcpy_toio(nfc->regs + NFC_RAM0_BASE, buf + offs, cnt); + writel(NFC_DATA_TRANS | NFC_DATA_SWAP_METHOD | + NFC_ACCESS_DIR | NFC_SEQ, nfc->regs + NFC_REG_CMD); + sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0); + offs += cnt; + len -= cnt; + } +} + +static uint8_t sunxi_nfc_read_byte(struct mtd_info *mtd) +{ + uint8_t ret; + + sunxi_nfc_read_buf(mtd, &ret, 1); + + return ret; +} + +static void sunxi_nfc_cmd_ctrl(struct mtd_info *mtd, int dat, + unsigned int ctrl) +{ + struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(mtd); + struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller); + u32 tmp; + + while ((readl(nfc->regs + NFC_REG_ST) & NFC_CMD_FIFO_STATUS)) + ; + + if (ctrl & NAND_CTRL_CHANGE) { + tmp = readl(nfc->regs + NFC_REG_CTL); + if (ctrl & NAND_NCE) + tmp |= NFC_CE_CTL; + else + tmp &= ~NFC_CE_CTL; + writel(tmp, nfc->regs + NFC_REG_CTL); + } + + if (dat == NAND_CMD_NONE) + return; + + if (ctrl & NAND_CLE) { + writel(NFC_SEND_CMD1 | dat, nfc->regs + NFC_REG_CMD); + } else { + writel(dat, nfc->regs + NFC_REG_ADDR_LOW); + writel(NFC_SEND_ADR, nfc->regs + NFC_REG_CMD); + } + + sunxi_nfc_wait_int(nfc, NFC_CMD_INT_FLAG, 0); +} + +static int sunxi_nand_chip_init_timings(struct sunxi_nand_chip *chip, + struct device_node *np) +{ + struct nand_timings timings; + u32 min_clk_period = 0; + int ret; + + ret = of_get_nand_timings(np, &timings); + if (ret) + return ret; + + /* NFC timings defined in Allwinner Datasheets */ + + /* T1 <=> tCLS */ + if (timings.tCLS_min > min_clk_period) + min_clk_period = timings.tCLS_min; + + /* T2 <=> tCLH */ + if (timings.tCLH_min > min_clk_period) + min_clk_period = timings.tCLH_min; + + /* T3 <=> tCS */ + if (timings.tCS_min > min_clk_period) + min_clk_period = timings.tCS_min; + + /* T4 <=> tCH */ + if (timings.tCH_min > min_clk_period) + min_clk_period = timings.tCH_min; + + /* T5 <=> tWP */ + if (timings.tWP_min > min_clk_period) + min_clk_period = timings.tWP_min; + + /* T6 <=> tWH */ + if (timings.tWH_min > min_clk_period) + min_clk_period = timings.tWH_min; + + /* T7 <=> tALS */ + if (timings.tALS_min > min_clk_period) + min_clk_period = timings.tALS_min; + + /* T8 <=> tDS */ + if (timings.tDS_min > min_clk_period) + min_clk_period = timings.tDS_min; + + /* T9 <=> tDH */ + if (timings.tDH_min > min_clk_period) + min_clk_period = timings.tDH_min; + + /* T10 <=> tRR */ + if (timings.tRR_min > (min_clk_period * 3)) + min_clk_period = (timings.tRR_min + 2) / 3; + + /* T11 <=> tALH */ + if (timings.tALH_min > min_clk_period) + min_clk_period = timings.tALH_min; + + /* T12 <=> tRP */ + if (timings.tRP_min > min_clk_period) + min_clk_period = timings.tRP_min; + + /* T13 <=> tREH */ + if (timings.tREH_min > min_clk_period) + min_clk_period = timings.tREH_min; + + /* T14 <=> tRC */ + if (timings.tRC_min > (min_clk_period * 2)) + min_clk_period = (timings.tRC_min + 1) / 2; + + /* T15 <=> tWC */ + if (timings.tWC_min > (min_clk_period * 2)) + min_clk_period = (timings.tWC_min + 1) / 2; + + + /* min_clk_period = (NAND-clk-period * 2) */ + if (!min_clk_period) + chip->clk_rate = 20000000; + else + chip->clk_rate = (2 * 1000000000) / min_clk_period; + + /* TODO: configure T16-T19 */ + + return 0; +} + +static int sunxi_nand_chip_init(struct device *dev, struct sunxi_nfc *nfc, + struct device_node *np) +{ + struct sunxi_nand_chip *chip; + struct mtd_part_parser_data ppdata; + struct mtd_info *mtd; + struct nand_chip *nand; + int nsels; + int ret; + int i; + u32 tmp; + + if (!of_get_property(np, "reg", &nsels)) + return -EINVAL; + + nsels /= sizeof(u32); + if (!nsels) + return -EINVAL; + + chip = devm_kzalloc(dev, + sizeof(*chip) + + (nsels * sizeof(struct sunxi_nand_chip_sel)), + GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->nsels = nsels; + chip->selected = -1; + + for (i = 0; i < nsels; i++) { + ret = of_property_read_u32_index(np, "reg", i, &tmp); + if (ret) + return ret; + + if (tmp > 7) + return -EINVAL; + + if (test_and_set_bit(tmp, &nfc->assigned_cs)) + return -EINVAL; + + chip->sels[i].cs = tmp; + + if (!of_property_read_u32_index(np, "allwinner,rb", i, &tmp) && + tmp < 2) { + chip->sels[i].rb.type = RB_NATIVE; + chip->sels[i].rb.info.nativeid = tmp; + } else { + ret = of_get_named_gpio(np, "rb-gpios", i); + if (ret >= 0) { + chip->sels[i].rb.type = RB_GPIO; + chip->sels[i].rb.info.gpio = tmp; + ret = devm_gpio_request(dev, tmp, "nand-rb"); + if (ret) + return ret; + } else { + chip->sels[i].rb.type = RB_NONE; + } + } + } + + ret = sunxi_nand_chip_init_timings(chip, np); + if (ret) + return ret; + + nand = &chip->nand; + nand->IO_ADDR_R = nand->IO_ADDR_W = nfc->regs + NFC_REG_IO_DATA; + nand->controller = &nfc->controller; + nand->select_chip = sunxi_nfc_select_chip; + nand->cmd_ctrl = sunxi_nfc_cmd_ctrl; + nand->read_buf = sunxi_nfc_read_buf; + nand->write_buf = sunxi_nfc_write_buf; + nand->read_byte = sunxi_nfc_read_byte; + + nand->ecc.mode = of_get_nand_ecc_mode(np); + if (of_get_nand_on_flash_bbt(np)) + nand->bbt_options |= NAND_BBT_USE_FLASH; + + mtd = &chip->mtd; + mtd->priv = nand; + mtd->owner = THIS_MODULE; + + ret = nand_scan_ident(mtd, nsels, NULL); + if (ret) + return ret; + + if (nand->ecc.mode == NAND_ECC_SOFT_BCH) { + nand->ecc.size = nand->ecc_step_ds; + nand->ecc.bytes = (((nand->ecc_strength_ds * + fls(8 * nand->ecc_step_ds)) + 7) / 8); + } + + ret = nand_scan_tail(mtd); + if (ret) + return ret; + + if (of_property_read_string(np, "nand-name", &mtd->name)) { + snprintf(chip->default_name, MAX_NAME_SIZE, + DEFAULT_NAME_FORMAT, chip->sels[i].cs); + mtd->name = chip->default_name; + } + + ppdata.of_node = np; + ret = mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0); + if (!ret) + return ret; + + list_add_tail(&chip->node, &nfc->chips); + + return 0; +} + +static int sunxi_nand_chips_init(struct device *dev, struct sunxi_nfc *nfc) +{ + struct device_node *np = dev->of_node; + struct device_node *nand_np; + int nchips = of_get_child_count(np); + int ret; + + if (nchips > 8) + return -EINVAL; + + for_each_child_of_node(np, nand_np) { + ret = sunxi_nand_chip_init(dev, nfc, nand_np); + if (ret) + return ret; + } + + return 0; +} + +static int sunxi_nfc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct resource *r; + struct sunxi_nfc *nfc; + int ret; + + nfc = devm_kzalloc(dev, sizeof(*nfc), GFP_KERNEL); + if (!nfc) { + dev_err(dev, "failed to allocate NFC struct\n"); + return -ENOMEM; + } + + spin_lock_init(&nfc->controller.lock); + init_waitqueue_head(&nfc->controller.wq); + INIT_LIST_HEAD(&nfc->chips); + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + nfc->regs = devm_ioremap_resource(dev, r); + if (IS_ERR(nfc->regs)) { + dev_err(dev, "failed to remap iomem\n"); + return PTR_ERR(nfc->regs); + } + + nfc->irq = platform_get_irq(pdev, 0); + if (nfc->irq < 0) { + dev_err(dev, "failed to retrieve irq\n"); + return nfc->irq; + } + + nfc->ahb_clk = devm_clk_get(dev, "ahb_clk"); + if (IS_ERR(nfc->ahb_clk)) { + dev_err(dev, "failed to retrieve ahb_clk\n"); + return PTR_ERR(nfc->ahb_clk); + } + + ret = clk_prepare_enable(nfc->ahb_clk); + if (ret) + return ret; + + nfc->sclk = devm_clk_get(dev, "sclk"); + if (IS_ERR(nfc->sclk)) { + dev_err(dev, "failed to retrieve nand_clk\n"); + ret = PTR_ERR(nfc->sclk); + goto out_ahb_clk_unprepare; + } + + ret = clk_prepare_enable(nfc->sclk); + if (ret) + goto out_ahb_clk_unprepare; + + /* Reset NFC */ + writel(readl(nfc->regs + NFC_REG_CTL) | NFC_RESET, + nfc->regs + NFC_REG_CTL); + while (readl(nfc->regs + NFC_REG_CTL) & NFC_RESET) + ; + + writel(0, nfc->regs + NFC_REG_INT); + ret = devm_request_irq(dev, nfc->irq, sunxi_nfc_interrupt, + 0, "sunxi-nfc", nfc); + if (ret) + goto out_sclk_unprepare; + + platform_set_drvdata(pdev, nfc); + + writel(0x100, nfc->regs + NFC_REG_TIMING_CTL); + writel(0x7ff, nfc->regs + NFC_REG_TIMING_CFG); + + ret = sunxi_nand_chips_init(dev, nfc); + if (ret) { + dev_err(dev, "failed to init nand chips\n"); + goto out_sclk_unprepare; + } + + return 0; + +out_sclk_unprepare: + clk_disable_unprepare(nfc->sclk); +out_ahb_clk_unprepare: + clk_disable_unprepare(nfc->ahb_clk); + + return ret; +} + +static const struct of_device_id sunxi_nfc_ids[] = { + { .compatible = "allwinner,sun4i-nfc" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, sunxi_nfc_ids); + +static struct platform_driver sunxi_nfc_driver = { + .driver = { + .name = "sunxi_nfc", + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(sunxi_nfc_ids), + }, + .probe = sunxi_nfc_probe, +}; +module_platform_driver(sunxi_nfc_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Boris BREZILLON"); +MODULE_DESCRIPTION("Allwinner NAND Flash Controller driver"); +MODULE_ALIAS("platform:sunxi_nfc");
Add the sunxi NAND Flash Controller driver. Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com> --- drivers/mtd/nand/Kconfig | 6 + drivers/mtd/nand/Makefile | 1 + drivers/mtd/nand/sunxi_nfc.c | 700 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 707 insertions(+) create mode 100644 drivers/mtd/nand/sunxi_nfc.c