The AT49BV6416 is locked by default, so we really need to provide
at least the unlock() operation for write and erase to work. This
patch implements both ->lock() and ->unlock() and provides a fixup
to install them when an AT49BV6416 chip is detected.
These functions are probably valid on more Atmel chips, but I don't
know exactly which ones. I can find out and add them if anyone cares.
Signed-off-by: Haavard Skinnemoen <[email protected]>
---
Now, I'm not quite sure how to use this to make the flash usable for
jffs2, etc. At the moment, it works if I unlock the flash using the
flash_unlock utility before mounting a jffs2 file system, but this
obviously won't work when using jffs2 as a root file system.
What's the best way to do this? Unlock the flash in the board-specific
mapping driver perhaps?
Haavard
drivers/mtd/chips/cfi_cmdset_0002.c | 90 +++++++++++++++++++++++++++++++++++
1 files changed, 90 insertions(+), 0 deletions(-)
diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
index 9885726..70ad7cf 100644
--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -45,9 +45,11 @@ #define FORCE_WORD_WRITE 0
#define MAX_WORD_RETRIES 3
#define MANUFACTURER_AMD 0x0001
+#define MANUFACTURER_ATMEL 0x001F
#define MANUFACTURER_SST 0x00BF
#define SST49LF004B 0x0060
#define SST49LF008A 0x005a
+#define AT49BV6416 0x00d6
static int cfi_amdstd_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int cfi_amdstd_write_words(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
@@ -68,6 +70,9 @@ static int get_chip(struct map_info *map
static void put_chip(struct map_info *map, struct flchip *chip, unsigned long adr);
#include "fwh_lock.h"
+static int cfi_atmel_lock(struct mtd_info *mtd, loff_t ofs, size_t len);
+static int cfi_atmel_unlock(struct mtd_info *mtd, loff_t ofs, size_t len);
+
static struct mtd_chip_driver cfi_amdstd_chipdrv = {
.probe = NULL, /* Not usable directly */
.destroy = cfi_amdstd_destroy,
@@ -179,6 +184,16 @@ static void fixup_use_erase_chip(struct
}
+/*
+ * Some Atmel chips (e.g. the AT49BV6416) power-up with all sectors
+ * locked by default.
+ */
+static void fixup_use_atmel_lock(struct mtd_info *mtd, void *param)
+{
+ mtd->lock = cfi_atmel_lock;
+ mtd->unlock = cfi_atmel_unlock;
+}
+
static struct cfi_fixup cfi_fixup_table[] = {
#ifdef AMD_BOOTLOC_BUG
{ CFI_MFR_AMD, CFI_ID_ANY, fixup_amd_bootblock, NULL },
@@ -197,6 +212,7 @@ #endif
static struct cfi_fixup jedec_fixup_table[] = {
{ MANUFACTURER_SST, SST49LF004B, fixup_use_fwh_lock, NULL, },
{ MANUFACTURER_SST, SST49LF008A, fixup_use_fwh_lock, NULL, },
+ { MANUFACTURER_ATMEL, AT49BV6416, fixup_use_atmel_lock, NULL },
{ 0, 0, NULL, NULL }
};
@@ -1607,6 +1623,80 @@ static int cfi_amdstd_erase_chip(struct
return 0;
}
+static int do_atmel_lock(struct map_info *map, struct flchip *chip,
+ unsigned long adr, int len, void *thunk)
+{
+ struct cfi_private *cfi = map->fldrv_priv;
+ int ret;
+
+ spin_lock(chip->mutex);
+ ret = get_chip(map, chip, adr + chip->start, FL_LOCKING);
+ if (ret)
+ goto out_unlock;
+ chip->state = FL_LOCKING;
+
+ DEBUG(MTD_DEBUG_LEVEL3, "MTD %s(): adr 0x%08lx len %d\n",
+ __func__, adr, len);
+
+ cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi,
+ cfi->device_type, NULL);
+ cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi,
+ cfi->device_type, NULL);
+ cfi_send_gen_cmd(0x80, cfi->addr_unlock1, chip->start, map, cfi,
+ cfi->device_type, NULL);
+ cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi,
+ cfi->device_type, NULL);
+ cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi,
+ cfi->device_type, NULL);
+ map_write(map, CMD(0x40), chip->start + adr);
+
+ chip->state = FL_READY;
+ put_chip(map, chip, adr + chip->start);
+ ret = 0;
+
+out_unlock:
+ spin_unlock(chip->mutex);
+ return ret;
+}
+
+static int do_atmel_unlock(struct map_info *map, struct flchip *chip,
+ unsigned long adr, int len, void *thunk)
+{
+ struct cfi_private *cfi = map->fldrv_priv;
+ int ret;
+
+ spin_lock(chip->mutex);
+ ret = get_chip(map, chip, adr + chip->start, FL_UNLOCKING);
+ if (ret)
+ goto out_unlock;
+ chip->state = FL_UNLOCKING;
+
+ DEBUG(MTD_DEBUG_LEVEL3, "MTD %s(): adr 0x%08lx len %d\n",
+ __func__, adr, len);
+
+ cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi,
+ cfi->device_type, NULL);
+ map_write(map, CMD(0x70), adr);
+
+ chip->state = FL_READY;
+ put_chip(map, chip, adr + chip->start);
+ ret = 0;
+
+out_unlock:
+ spin_unlock(chip->mutex);
+ return ret;
+}
+
+static int cfi_atmel_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
+{
+ return cfi_varsize_frob(mtd, do_atmel_lock, ofs, len, NULL);
+}
+
+static int cfi_atmel_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
+{
+ return cfi_varsize_frob(mtd, do_atmel_unlock, ofs, len, NULL);
+}
+
static void cfi_amdstd_sync (struct mtd_info *mtd)
{
--
1.4.0
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