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

[Linux-MTD Mailing List]

Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=24fec651d1cc396e6e24631386e0d5dd5f329fbc
Commit:     24fec651d1cc396e6e24631386e0d5dd5f329fbc
Parent:     11d7f826639baa25e7930d2b34c84c2d67f85ddc
Author:     Lee Jones <lee.jones at linaro.org>
AuthorDate: Thu Mar 20 09:20:41 2014 +0000
Committer:  Brian Norris <computersforpeace at gmail.com>
CommitDate: Thu Mar 20 04:17:15 2014 -0700

    mtd: st_spi_fsm: Dynamically setup flash device based on JEDEC ID
    
    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 at st.com>
    Signed-off-by: Lee Jones <lee.jones at linaro.org>
    Signed-off-by: Brian Norris <computersforpeace at gmail.com>
---
 drivers/mtd/devices/st_spi_fsm.c | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
index 29da522..9467585 100644
--- a/drivers/mtd/devices/st_spi_fsm.c
+++ b/drivers/mtd/devices/st_spi_fsm.c
@@ -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);
 }