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From 0add8e5c60961d2b99174610df8d3d9d6d192b74 Mon Sep 17 00:00:00 2001
From: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Date: Wed, 7 Nov 2012 14:16:11 +0100
Subject: sf: spansion: add support for 4-byte address mode
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
--- a/drivers/mtd/spi/spansion.c
+++ b/drivers/mtd/spi/spansion.c
@@ -31,6 +31,10 @@
#include "spi_flash_internal.h"
+#define S25FLXX_BRRD 0x16 /* Read Bank Register */
+#define S25FLXX_BRWR 0x17 /* Write Bank Register */
+#define S25FLXX_BAR_EXTADD (1 << 7) /* Extended address enable */
+
struct spansion_spi_flash_params {
u16 idcode1;
u16 idcode2;
@@ -112,6 +116,23 @@ static const struct spansion_spi_flash_p
},
};
+static __maybe_unused int spansion_set_4byte_mode(struct spi_flash *flash)
+{
+ struct spi_slave *spi = flash->spi;
+ u8 bar, cmd;
+ int err;
+
+ cmd = S25FLXX_BRRD;
+ err = spi_flash_cmd(spi, cmd, &bar, 1);
+ if (err)
+ return err;
+
+ bar |= S25FLXX_BAR_EXTADD;
+ cmd = S25FLXX_BRWR;
+
+ return spi_flash_cmd_write(spi, &cmd, 1, &bar, 1);
+}
+
int spi_flash_probe_spansion(struct spi_flash *flash, u8 *idcode)
{
const struct spansion_spi_flash_params *params;
@@ -144,5 +165,10 @@ int spi_flash_probe_spansion(struct spi_
flash->sector_size = 256 * params->pages_per_sector;
flash->size = flash->sector_size * params->nr_sectors;
+#ifdef CONFIG_SPI_FLASH_4BYTE_MODE
+ if (flash->size > (1 << 24))
+ flash->set_4byte_mode = spansion_set_4byte_mode;
+#endif
+
return 1;
}
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