mtd: m25p80: Add Spansion S25FL256S

These are 32MiB parts which use a slightly different 4-byte enable
sequence from Macronix.

Default to the Spansion 4-byte scheme in set_4byte(), as it is more
likely to be copied by other vendors.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 17 insertions, 5 deletions

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 16adfaa78018..e050cc8b3ee7 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -56,6 +56,9 @@
 #define OPCODE_EN4B             0xb7    /* Enter 4-byte mode */
 #define OPCODE_EX4B             0xe9    /* Exit 4-byte mode */
 
+/* Used for Spansion flashes only. */
+#define OPCODE_BRWR             0x17    /* Bank register write */
+
 /* Status Register bits. */
 #define SR_WIP                  1       /* Write in progress */
 #define SR_WEL                  2       /* Write enable latch */
@@ -161,11 +164,18 @@ static inline int write_disable(struct m25p *flash)
 /*
  * Enable/disable 4-byte addressing mode.
  */
-static inline int set_4byte(struct m25p *flash, int enable)
+static inline int set_4byte(struct m25p *flash, u32 jedec_id, int enable)
 {
-        u8      code = enable ? OPCODE_EN4B : OPCODE_EX4B;
-
-        return spi_write_then_read(flash->spi, &code, 1, NULL, 0);
+        switch (JEDEC_MFR(jedec_id)) {
+        case CFI_MFR_MACRONIX:
+                flash->command[0] = enable ? OPCODE_EN4B : OPCODE_EX4B;
+                return spi_write(flash->spi, flash->command, 1);
+        default:
+                /* Spansion style */
+                flash->command[0] = OPCODE_BRWR;
+                flash->command[1] = enable << 7;
+                return spi_write(flash->spi, flash->command, 2);
+        }
 }
 
 /*
@@ -688,6 +698,8 @@ static const struct spi_device_id m25p_ids[] = {
         { "s25sl032a",  INFO(0x010215,      0,  64 * 1024,  64, 0) },
         { "s25sl032p",  INFO(0x010215, 0x4d00,  64 * 1024,  64, SECT_4K) },
         { "s25sl064a",  INFO(0x010216,      0,  64 * 1024, 128, 0) },
+        { "s25fl256s0", INFO(0x010219, 0x4d00, 256 * 1024, 128, 0) },
+        { "s25fl256s1", INFO(0x010219, 0x4d01,  64 * 1024, 512, 0) },
         { "s25sl12800", INFO(0x012018, 0x0300, 256 * 1024,  64, 0) },
         { "s25sl12801", INFO(0x012018, 0x0301,  64 * 1024, 256, 0) },
         { "s25fl129p0", INFO(0x012018, 0x4d00, 256 * 1024,  64, 0) },
@@ -921,7 +933,7 @@ static int __devinit m25p_probe(struct spi_device *spi)
                 /* enable 4-byte addressing if the device exceeds 16MiB */
                 if (flash->mtd.size > 0x1000000) {
                         flash->addr_width = 4;
-                        set_4byte(flash, 1);
+                        set_4byte(flash, info->jedec_id, 1);
                 } else
                         flash->addr_width = 3;
         }