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Subject[PATCH 9/9] mtd: spi-nor: add support to SST sst26* QSPI memories
Date
This patch adds support to the SST sst26* QSPI memories.
It also adds a new SST_BLOCK_PROTECT flag so spi_nor_scan() sends
a SST Global Block Protection Unlock (98h) command once for all
otherwise later Sector Erase and Page Program commands would fail.

It was tested with sst26vf016b, sst26vf032b, sst26vf032ba and sst26vf064b
on a sama5d2 xplained board at 55.3MHz and 3.3V.

sst26wf040b and sst26wf080b were not tested since they are 1.8V memories
hence don't fit the sama5d2 xplained board requirements.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
drivers/mtd/spi-nor/spi-nor.c | 20 ++++++++++++++++++++
include/linux/mtd/spi-nor.h | 1 +
2 files changed, 21 insertions(+)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 031c6792a3fe..355824bd3587 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -81,6 +81,7 @@ struct flash_info {
* to support memory size above 128Mib.
*/
#define SPI_NOR_SKIP_SFDP BIT(11) /* Skip read of SFDP tables */
+#define SST_BLOCK_PROTECT BIT(12) /* use SST Unlock Block-Protection */
};

#define JEDEC_MFR(info) ((info)->id[0])
@@ -999,6 +1000,11 @@ static const struct flash_info spi_nor_ids[] = {
{ "sst25wf040b", INFO(0x621613, 0, 64 * 1024, 8, SECT_4K) },
{ "sst25wf040", INFO(0xbf2504, 0, 64 * 1024, 8, SECT_4K | SST_WRITE) },
{ "sst25wf080", INFO(0xbf2505, 0, 64 * 1024, 16, SECT_4K | SST_WRITE) },
+ { "sst26vf016b", INFO(0xbf2641, 0, 64 * 1024, 32, SECT_4K | SST_BLOCK_PROTECT) },
+ { "sst26vf032b", INFO(0xbf2642, 0, 64 * 1024, 64, SECT_4K | SST_BLOCK_PROTECT) },
+ { "sst26vf064b", INFO(0xbf2643, 0, 64 * 1024, 128, SECT_4K | SST_BLOCK_PROTECT) },
+ { "sst26wf040b", INFO(0xbf2654, 0, 64 * 1024, 8, SECT_4K | SST_BLOCK_PROTECT) },
+ { "sst26wf080b", INFO(0xbf2658, 0, 64 * 1024, 16, SECT_4K | SST_BLOCK_PROTECT) },

/* ST Microelectronics -- newer production may have feature updates */
{ "m25p05", INFO(0x202010, 0, 32 * 1024, 2, 0) },
@@ -1135,6 +1141,14 @@ static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len,
return ret;
}

+static int sst_unlock_block_protection(struct spi_nor *nor)
+{
+ int ret;
+
+ ret = write_enable(nor);
+ return ret ? ret : nor->write_reg(nor, SPINOR_OP_ULBPR, NULL, 0);
+}
+
static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
@@ -2308,6 +2322,12 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
return -EINVAL;
}

+ if (info->flags & SST_BLOCK_PROTECT) {
+ ret = sst_unlock_block_protection(nor);
+ if (ret)
+ return ret;
+ }
+
dev_info(dev, "%s (%lld Kbytes)\n", info->name,
(long long)mtd->size >> 10);

diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index ede7ad83c9c5..016b6c51e854 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -80,6 +80,7 @@
#define SPINOR_OP_BP 0x02 /* Byte program */
#define SPINOR_OP_WRDI 0x04 /* Write disable */
#define SPINOR_OP_AAI_WP 0xad /* Auto address increment word program */
+#define SPINOR_OP_ULBPR 0x98 /* Global Block Protection Unlock */

/* Used for Macronix and Winbond flashes. */
#define SPINOR_OP_EN4B 0xb7 /* Enter 4-byte mode */
--
2.7.4
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