[PATCH 7/9] MTD: add few workarounds to nand system for SmartMedia/xD chips.

Maxim Levitsky
2010-01-08T15:10:33Z

>From 4ade18c0eff30b0a5aa7360651448ec4efff761f Mon Sep 17 00:00:00 2001
From: Maxim Levitsky <maximlevitsky@gmail.com>
Date: Fri, 8 Jan 2010 16:03:10 +0200
Subject: [PATCH 7/9] MTD: add few workarounds to nand system for SmartMedia/xD chips.

* Add an option NAND_SMARTMEDIA that can be set by nand driver
If set, it will cause separate ID table to be used, which includes
mask rom devices and new xD cards

* Workaround for wrong write protect status on some xD cards

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
---
drivers/mtd/nand/nand_base.c | 29 +++++++++++++++++++++--------
drivers/mtd/nand/nand_ids.c | 38 ++++++++++++++++++++++++++++++++++++++
drivers/mtd/sm_common.c | 2 +-
include/linux/mtd/nand.h | 11 +++++++++++
4 files changed, 71 insertions(+), 9 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 8e31245..a4a9284 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -398,9 +398,17 @@ static int nand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
static int nand_check_wp(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd->priv;
+ int wp;
+
/* Check the WP bit */
chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
- return (chip->read_byte(mtd) & NAND_STATUS_WP) ? 0 : 1;
+ wp = (chip->read_byte(mtd) & NAND_STATUS_WP) ? 0 : 1;
+
+ /* broken xD cards report WP despite beeing writable */
+ if (chip->options & NAND_BROKEN_XD)
+ return 0;
+
+ return wp;
}

/**
@@ -2624,14 +2632,18 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
}

/* Lookup the flash id */
- for (i = 0; nand_flash_ids[i].name != NULL; i++) {
- if (dev_id == nand_flash_ids[i].id) {
- type = &nand_flash_ids[i];
+#ifdef CONFIG_MTD_NAND_SMARTMEDIA
+ if (chip->options & NAND_SMARTMEDIA)
+ type = nand_smartmedia_flash_ids;
+ else
+#endif
+ type = nand_flash_ids;
+
+ for (i = 0; type->name != NULL; type++)
+ if (dev_id == type->id)
break;
- }
- }

- if (!type)
+ if (!type->name)
return ERR_PTR(-ENODEV);

if (!mtd->name)
@@ -2988,7 +3000,8 @@ int nand_scan_tail(struct mtd_info *mtd)

/* Fill in remaining MTD driver data */
mtd->type = MTD_NANDFLASH;
- mtd->flags = MTD_CAP_NANDFLASH;
+ mtd->flags = chip->options & NAND_ROM ? MTD_CAP_ROM :
+ MTD_CAP_NANDFLASH;
mtd->erase = nand_erase;
mtd->point = NULL;
mtd->unpoint = NULL;
diff --git a/drivers/mtd/nand/nand_ids.c b/drivers/mtd/nand/nand_ids.c
index 69ee2c9..7ac7538 100644
--- a/drivers/mtd/nand/nand_ids.c
+++ b/drivers/mtd/nand/nand_ids.c
@@ -127,6 +127,44 @@ struct nand_flash_dev nand_flash_ids[] = {
{NULL,}
};

+#ifdef CONFIG_MTD_NAND_SMARTMEDIA
+struct nand_flash_dev nand_smartmedia_flash_ids[] = {
+
+ /* SmartMedia */
+ {"SmartMedia 1MiB 5V", 0x6e, 256, 1, 0x1000, 0},
+ {"SmartMedia 1MiB 3,3V", 0xe8, 256, 1, 0x1000, 0},
+ {"SmartMedia 1MiB 3,3V", 0xec, 256, 1, 0x1000, 0},
+ {"SmartMedia 2MiB 3,3V", 0xea, 256, 2, 0x1000, 0},
+ {"SmartMedia 2MiB 5V", 0x64, 256, 2, 0x1000, 0},
+ {"SmartMedia 2MiB 3,3V ROM", 0x5d, 512, 2, 0x2000, NAND_ROM},
+ {"SmartMedia 4MiB 3,3V", 0xe3, 512, 4, 0x2000, 0},
+ {"SmartMedia 4MiB 3,3/5V", 0xe5, 512, 4, 0x2000, 0},
+ {"SmartMedia 4MiB 5V", 0x6b, 512, 4, 0x2000, 0},
+ {"SmartMedia 4MiB 3,3V ROM", 0xd5, 512, 4, 0x2000, NAND_ROM},
+ {"SmartMedia 8MiB 3,3V", 0xe6, 512, 8, 0x2000, 0},
+ {"SmartMedia 8MiB 3,3V ROM", 0xd6, 512, 8, 0x2000, NAND_ROM},
+
+ /* xD / SmartMedia */
+ {"SmartMedia/xD 16MiB 3,3V", 0x73, 512, 16, 0x4000, 0},
+ {"SmartMedia 16MiB 3,3V ROM", 0x57, 512, 16, 0x4000, NAND_ROM},
+ {"SmartMedia/xD 32MiB 3,3V", 0x75, 512, 32, 0x4000, 0},
+ {"SmartMedia 32MiB 3,3V ROM", 0x58, 512, 32, 0x4000, NAND_ROM},
+ {"SmartMedia/xD 64MiB 3,3V", 0x76, 512, 64, 0x4000, 0},
+ {"SmartMedia 64MiB 3,3V ROM", 0xd9, 512, 64, 0x4000, NAND_ROM},
+ {"SmartMedia/xD 128MiB 3,3V", 0x79, 512, 128, 0x4000, 0},
+ {"SmartMedia 128MiB 3,3V ROM", 0xda, 512, 128, 0x4000, NAND_ROM},
+ {"SmartMedia/xD 256MiB 3,3V", 0x71, 512, 256, 0x4000, NAND_BROKEN_XD},
+ {"SmartMedia 256MiB 3,3V ROM", 0x5b, 512, 256, 0x4000, NAND_ROM},
+
+ /* xD only */
+ {"xD 512MiB 3,3V", 0xDC, 512, 512, 0x4000, NAND_BROKEN_XD},
+ {"xD 1GiB 3,3V", 0xD3, 512, 1024, 0x4000, NAND_BROKEN_XD},
+ {"xD 2GiB 3,3V", 0xD5, 512, 2048, 0x4000, NAND_BROKEN_XD},
+ {NULL,}
+};
+EXPORT_SYMBOL(nand_smartmedia_flash_ids);
+#endif
+
/*
* Manufacturer ID list
*/
diff --git a/drivers/mtd/sm_common.c b/drivers/mtd/sm_common.c
index 45b577f..6234482 100644
--- a/drivers/mtd/sm_common.c
+++ b/drivers/mtd/sm_common.c
@@ -186,7 +186,7 @@ int sm_register_device(struct mtd_info *mtd)
struct nand_chip *chip = (struct nand_chip *)mtd->priv;
int ret;

- chip->options |= NAND_SKIP_BBTSCAN | NAND_NO_AUTOINCR;
+ chip->options |= NAND_SKIP_BBTSCAN | NAND_SMARTMEDIA | NAND_NO_AUTOINCR;

/* Scan for card properties */
ret = nand_scan_ident(mtd, 1);
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 75575fb..a3670c1 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -170,6 +170,12 @@ typedef enum {
/* Chip does not allow subpage writes */
#define NAND_NO_SUBPAGE_WRITE 0x00000200

+/* Device is one of 'new' xD cards that expose fake nand command set */
+#define NAND_BROKEN_XD 0x00000400
+
+/* Device behaves just like nand, but is readonly */
+#define NAND_ROM 0x00000800
+
/* Options valid for Samsung large page devices */
#define NAND_SAMSUNG_LP_OPTIONS \
(NAND_NO_PADDING | NAND_CACHEPRG | NAND_COPYBACK)
@@ -195,9 +201,13 @@ typedef enum {
/* This option is defined if the board driver allocates its own buffers
(e.g. because it needs them DMA-coherent */
#define NAND_OWN_BUFFERS 0x00040000
+
/* Chip may not exist, so silence any errors in scan */
#define NAND_SCAN_SILENT_NODEV 0x00080000

+/* controller supports only xD/SmartMedia cards*/
+#define NAND_SMARTMEDIA 0x00100000
+
/* Options set by nand scan */
/* Nand scan has allocated controller struct */
#define NAND_CONTROLLER_ALLOC 0x80000000
@@ -458,6 +468,7 @@ struct nand_manufacturers {
};

extern struct nand_flash_dev nand_flash_ids[];
+extern struct nand_flash_dev nand_smartmedia_flash_ids[];
extern struct nand_manufacturers nand_manuf_ids[];

extern int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd);
--
1.6.3.3