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mtd: st_spi_fsm: Dynamically setup flash device based on JEDEC ID

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Using previously added infrastructure we can now extract a device's JEDEC
ID, compare it to a list of known and supported devices and make assumptions
based on known characteristics of a given chip.

Acked-by Angus Clark <angus.clark@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Lee Jones 2014-03-20 09:20:41 +00:00 committed by Brian Norris
parent 11d7f82663
commit 24fec651d1
1 changed files with 25 additions and 1 deletions
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26
drivers/mtd/devices/st_spi_fsm.c
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@ -204,6 +204,7 @@ struct stfsm {
struct resource *region;
struct mtd_info mtd;
struct mutex lock;
struct flash_info *info;
uint32_t fifo_dir_delay;
};
@ -477,6 +478,7 @@ static void stfsm_read_jedec(struct stfsm *fsm, uint8_t *const jedec)
static struct flash_info *stfsm_jedec_probe(struct stfsm *fsm)
{
struct flash_info *info;
u16 ext_jedec;
u32 jedec;
u8 id[5];
@ -494,6 +496,15 @@ static struct flash_info *stfsm_jedec_probe(struct stfsm *fsm)
dev_dbg(fsm->dev, "JEDEC = 0x%08x [%02x %02x %02x %02x %02x]\n",
jedec, id[0], id[1], id[2], id[3], id[4]);
for (info = flash_types; info->name; info++) {
if (info->jedec_id == jedec) {
if (info->ext_id && info->ext_id != ext_jedec)
continue;
return info;
}
}
dev_err(fsm->dev, "Unrecognized JEDEC id %06x\n", jedec);
return NULL;
}
@ -588,6 +599,7 @@ static int stfsm_init(struct stfsm *fsm)
static int stfsm_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct flash_info *info;
struct resource *res;
struct stfsm *fsm;
int ret;
@ -627,13 +639,25 @@ static int stfsm_probe(struct platform_device *pdev)
}
/* Detect SPI FLASH device */
stfsm_jedec_probe(fsm);
info = stfsm_jedec_probe(fsm);
if (!info)
return -ENODEV;
fsm->info = info;
fsm->mtd.dev.parent = &pdev->dev;
fsm->mtd.type = MTD_NORFLASH;
fsm->mtd.writesize = 4;
fsm->mtd.writebufsize = fsm->mtd.writesize;
fsm->mtd.flags = MTD_CAP_NORFLASH;
fsm->mtd.size = info->sector_size * info->n_sectors;
fsm->mtd.erasesize = info->sector_size;
dev_err(&pdev->dev,
"Found serial flash device: %s\n"
" size = %llx (%lldMiB) erasesize = 0x%08x (%uKiB)\n",
info->name,
(long long)fsm->mtd.size, (long long)(fsm->mtd.size >> 20),
fsm->mtd.erasesize, (fsm->mtd.erasesize >> 10));
return mtd_device_parse_register(&fsm->mtd, NULL, NULL, NULL, 0);
}