diff mbox

[v5,03/14] mtd: nand: pxa3xx: Add bad block handling

Message ID 1384464339-6817-4-git-send-email-ezequiel.garcia@free-electrons.com (mailing list archive)
State New, archived
Headers show

Commit Message

Ezequiel Garcia Nov. 14, 2013, 9:25 p.m. UTC
Add support for flash-based bad block table using Marvell's
custom in-flash bad block table layout. The support is enabled
a 'flash_bbt' platform data or device tree parameter.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
---
 .../devicetree/bindings/mtd/pxa3xx-nand.txt        |  2 ++
 drivers/mtd/nand/pxa3xx_nand.c                     | 37 ++++++++++++++++++++++
 include/linux/platform_data/mtd-nand-pxa3xx.h      |  3 ++
 3 files changed, 42 insertions(+)

Comments

Brian Norris Nov. 14, 2013, 10:12 p.m. UTC | #1
On Thu, Nov 14, 2013 at 06:25:28PM -0300, Ezequiel Garcia wrote:
> --- a/Documentation/devicetree/bindings/mtd/pxa3xx-nand.txt
> +++ b/Documentation/devicetree/bindings/mtd/pxa3xx-nand.txt
> @@ -15,6 +15,8 @@ Optional properties:
>   - marvell,nand-keep-config:	Set to keep the NAND controller config as set
>  				by the bootloader
>   - num-cs:			Number of chipselect lines to usw
> + - nand-on-flash-bbt: 		boolean to enable on flash bbt option if
> +				not present false

It's not really your problem, but I just noticed that this binding
description is particularly badly worded! No need to change it in this
patch, since it's a copy-and-paste from the generic nand.txt, but it's
probably worth rewriting all of them sometime.

Brian
Ezequiel Garcia Nov. 14, 2013, 10:37 p.m. UTC | #2
On Thu, Nov 14, 2013 at 02:12:12PM -0800, Brian Norris wrote:
> On Thu, Nov 14, 2013 at 06:25:28PM -0300, Ezequiel Garcia wrote:
> > --- a/Documentation/devicetree/bindings/mtd/pxa3xx-nand.txt
> > +++ b/Documentation/devicetree/bindings/mtd/pxa3xx-nand.txt
> > @@ -15,6 +15,8 @@ Optional properties:
> >   - marvell,nand-keep-config:	Set to keep the NAND controller config as set
> >  				by the bootloader
> >   - num-cs:			Number of chipselect lines to usw
> > + - nand-on-flash-bbt: 		boolean to enable on flash bbt option if
> > +				not present false
> 
> It's not really your problem, but I just noticed that this binding
> description is particularly badly worded! No need to change it in this
> patch, since it's a copy-and-paste from the generic nand.txt, but it's
> probably worth rewriting all of them sometime.
> 

Indeed. And it's a bit embarrasing that I did such obviously mediocre
copy-paste.
diff mbox

Patch

diff --git a/Documentation/devicetree/bindings/mtd/pxa3xx-nand.txt b/Documentation/devicetree/bindings/mtd/pxa3xx-nand.txt
index bed8390..86e0a56 100644
--- a/Documentation/devicetree/bindings/mtd/pxa3xx-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/pxa3xx-nand.txt
@@ -15,6 +15,8 @@  Optional properties:
  - marvell,nand-keep-config:	Set to keep the NAND controller config as set
 				by the bootloader
  - num-cs:			Number of chipselect lines to usw
+ - nand-on-flash-bbt: 		boolean to enable on flash bbt option if
+				not present false
 
 Example:
 
diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index 8af4746..6293ff4 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -26,6 +26,7 @@ 
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/of_mtd.h>
 
 #if defined(CONFIG_ARCH_PXA) || defined(CONFIG_ARCH_MMP)
 #define ARCH_HAS_DMA
@@ -241,6 +242,29 @@  static struct pxa3xx_nand_flash builtin_flash_types[] = {
 { "256MiB 16-bit", 0xba20,  64, 2048, 16, 16, 2048, &timing[3] },
 };
 
+static u8 bbt_pattern[] = {'M', 'V', 'B', 'b', 't', '0' };
+static u8 bbt_mirror_pattern[] = {'1', 't', 'b', 'B', 'V', 'M' };
+
+static struct nand_bbt_descr bbt_main_descr = {
+	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
+		| NAND_BBT_2BIT | NAND_BBT_VERSION,
+	.offs =	8,
+	.len = 6,
+	.veroffs = 14,
+	.maxblocks = 8,		/* Last 8 blocks in each chip */
+	.pattern = bbt_pattern
+};
+
+static struct nand_bbt_descr bbt_mirror_descr = {
+	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
+		| NAND_BBT_2BIT | NAND_BBT_VERSION,
+	.offs =	8,
+	.len = 6,
+	.veroffs = 14,
+	.maxblocks = 8,		/* Last 8 blocks in each chip */
+	.pattern = bbt_mirror_pattern
+};
+
 /* Define a default flash type setting serve as flash detecting only */
 #define DEFAULT_FLASH_TYPE (&builtin_flash_types[0])
 
@@ -1126,6 +1150,18 @@  KEEP_CONFIG:
 
 	if (nand_scan_ident(mtd, 1, def))
 		return -ENODEV;
+
+	if (pdata->flash_bbt) {
+		/*
+		 * We'll use a bad block table stored in-flash and don't
+		 * allow writing the bad block marker to the flash.
+		 */
+		chip->bbt_options |= NAND_BBT_USE_FLASH |
+				     NAND_BBT_NO_OOB_BBM;
+		chip->bbt_td = &bbt_main_descr;
+		chip->bbt_md = &bbt_mirror_descr;
+	}
+
 	/* calculate addressing information */
 	if (mtd->writesize >= 2048)
 		host->col_addr_cycles = 2;
@@ -1320,6 +1356,7 @@  static int pxa3xx_nand_probe_dt(struct platform_device *pdev)
 	if (of_get_property(np, "marvell,nand-keep-config", NULL))
 		pdata->keep_config = 1;
 	of_property_read_u32(np, "num-cs", &pdata->num_cs);
+	pdata->flash_bbt = of_get_nand_on_flash_bbt(np);
 
 	pdev->dev.platform_data = pdata;
 
diff --git a/include/linux/platform_data/mtd-nand-pxa3xx.h b/include/linux/platform_data/mtd-nand-pxa3xx.h
index ffb8019..a941471 100644
--- a/include/linux/platform_data/mtd-nand-pxa3xx.h
+++ b/include/linux/platform_data/mtd-nand-pxa3xx.h
@@ -55,6 +55,9 @@  struct pxa3xx_nand_platform_data {
 	/* indicate how many chip selects will be used */
 	int	num_cs;
 
+	/* use an flash-based bad block table */
+	bool	flash_bbt;
+
 	const struct mtd_partition		*parts[NUM_CHIP_SELECT];
 	unsigned int				nr_parts[NUM_CHIP_SELECT];