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mtd: cfi_cmdset_0002: Invalidate cache after entering/exiting OTP memory

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When the one time programmable (OTP) memory region is entered by
issuing the 0xaa/0x55/0x88 command, the OTP memory occupies the
addresses which are normally used by the first sector of the regular
flash memory. This patch therefore invalidates cache for this
addresses after entering/exiting OTP memory.

This patch also moves the code into separate functions.

Signed-off-by: Christian Riesch <christian.riesch@omicron.at>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Christian Riesch 2013-04-26 21:10:28 +02:00 committed by Brian Norris
parent dc7e9ecdd6
commit feb8677935
1 changed files with 34 additions and 10 deletions
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44
drivers/mtd/chips/cfi_cmdset_0002.c
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@ -1152,11 +1152,42 @@ static int cfi_amdstd_read (struct mtd_info *mtd, loff_t from, size_t len, size_
typedef int (*otp_op_t)(struct map_info *map, struct flchip *chip,
loff_t adr, size_t len, u_char *buf);
static inline void otp_enter(struct map_info *map, struct flchip *chip,
loff_t adr, size_t len)
{
struct cfi_private *cfi = map->fldrv_priv;
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(0x88, cfi->addr_unlock1, chip->start, map, cfi,
cfi->device_type, NULL);
INVALIDATE_CACHED_RANGE(map, chip->start + adr, len);
}
static inline void otp_exit(struct map_info *map, struct flchip *chip,
loff_t adr, size_t len)
{
struct cfi_private *cfi = map->fldrv_priv;
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(0x90, cfi->addr_unlock1, chip->start, map, cfi,
cfi->device_type, NULL);
cfi_send_gen_cmd(0x00, cfi->addr_unlock1, chip->start, map, cfi,
cfi->device_type, NULL);
INVALIDATE_CACHED_RANGE(map, chip->start + adr, len);
}
static inline int do_read_secsi_onechip(struct map_info *map, struct flchip *chip, loff_t adr, size_t len, u_char *buf)
{
DECLARE_WAITQUEUE(wait, current);
unsigned long timeo = jiffies + HZ;
struct cfi_private *cfi = map->fldrv_priv;
retry:
mutex_lock(&chip->mutex);
@ -1178,16 +1209,9 @@ static inline int do_read_secsi_onechip(struct map_info *map, struct flchip *chi
chip->state = FL_READY;
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(0x88, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
otp_enter(map, chip, adr, len);
map_copy_from(map, buf, 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(0x90, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
cfi_send_gen_cmd(0x00, cfi->addr_unlock1, chip->start, map, cfi, cfi->device_type, NULL);
otp_exit(map, chip, adr, len);
wake_up(&chip->wq);
mutex_unlock(&chip->mutex);