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authorLinus Torvalds <torvalds@linux-foundation.org>2009-09-23 21:07:49 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-23 21:07:49 +0400
commita7c367b95a9d8e65e0f0e7da31f700a556794efb (patch)
tree5b1bb202801e29e3237381aa7aad5aa288378d5b /drivers/mtd/devices
parent15f964bed054821d6d940d3752508c5f96a9ffd3 (diff)
parente1070211f7327a1f197d535aa886f721a241c32f (diff)
downloadlinux-a7c367b95a9d8e65e0f0e7da31f700a556794efb.tar.xz
Merge git://git.infradead.org/mtd-2.6
* git://git.infradead.org/mtd-2.6: (58 commits) mtd: jedec_probe: add PSD4256G6V id mtd: OneNand support for Nomadik 8815 SoC (on NHK8815 board) mtd: nand: driver for Nomadik 8815 SoC (on NHK8815 board) m25p80: Add Spansion S25FL129P serial flashes jffs2: Use SLAB_HWCACHE_ALIGN for jffs2_raw_{dirent,inode} slabs mtd: sh_flctl: register sh_flctl using platform_driver_probe() mtd: nand: txx9ndfmc: transfer 512 byte at a time if possible mtd: nand: fix tmio_nand ecc correction mtd: nand: add __nand_correct_data helper function mtd: cfi_cmdset_0002: add 0xFF intolerance for M29W128G mtd: inftl: fix fold chain block number mtd: jedec: fix compilation problem with I28F640C3B definition mtd: nand: fix ECC Correction bug for SMC ordering for NDFC driver mtd: ofpart: Check availability of reg property instead of name property driver/Makefile: Initialize "mtd" and "spi" before "net" mtd: omap: adding DMA mode support in nand prefetch/post-write mtd: omap: add support for nand prefetch-read and post-write mtd: add nand support for w90p910 (v2) mtd: maps: add mtd-ram support to physmap_of mtd: pxa3xx_nand: add single-bit error corrections reporting ...
Diffstat (limited to 'drivers/mtd/devices')
-rw-r--r--drivers/mtd/devices/Kconfig10
-rw-r--r--drivers/mtd/devices/Makefile1
-rw-r--r--drivers/mtd/devices/lart.c6
-rw-r--r--drivers/mtd/devices/m25p80.c137
-rw-r--r--drivers/mtd/devices/mtd_dataflash.c4
-rw-r--r--drivers/mtd/devices/phram.c25
-rw-r--r--drivers/mtd/devices/slram.c2
-rw-r--r--drivers/mtd/devices/sst25l.c512
8 files changed, 677 insertions, 20 deletions
diff --git a/drivers/mtd/devices/Kconfig b/drivers/mtd/devices/Kconfig
index 325fab92a62c..c222514bb70d 100644
--- a/drivers/mtd/devices/Kconfig
+++ b/drivers/mtd/devices/Kconfig
@@ -104,6 +104,16 @@ config M25PXX_USE_FAST_READ
help
This option enables FAST_READ access supported by ST M25Pxx.
+config MTD_SST25L
+ tristate "Support SST25L (non JEDEC) SPI Flash chips"
+ depends on SPI_MASTER
+ help
+ This enables access to the non JEDEC SST25L SPI flash chips, used
+ for program and data storage.
+
+ Set up your spi devices with the right board-specific platform data,
+ if you want to specify device partitioning.
+
config MTD_SLRAM
tristate "Uncached system RAM"
help
diff --git a/drivers/mtd/devices/Makefile b/drivers/mtd/devices/Makefile
index 0993d5cf3923..ab5c9b92ac82 100644
--- a/drivers/mtd/devices/Makefile
+++ b/drivers/mtd/devices/Makefile
@@ -16,3 +16,4 @@ obj-$(CONFIG_MTD_LART) += lart.o
obj-$(CONFIG_MTD_BLOCK2MTD) += block2mtd.o
obj-$(CONFIG_MTD_DATAFLASH) += mtd_dataflash.o
obj-$(CONFIG_MTD_M25P80) += m25p80.o
+obj-$(CONFIG_MTD_SST25L) += sst25l.o
diff --git a/drivers/mtd/devices/lart.c b/drivers/mtd/devices/lart.c
index 578de1c67bfe..f4359fe7150f 100644
--- a/drivers/mtd/devices/lart.c
+++ b/drivers/mtd/devices/lart.c
@@ -393,7 +393,8 @@ static int flash_erase (struct mtd_info *mtd,struct erase_info *instr)
* erase range is aligned with the erase size which is in
* effect here.
*/
- if (instr->addr & (mtd->eraseregions[i].erasesize - 1)) return (-EINVAL);
+ if (i < 0 || (instr->addr & (mtd->eraseregions[i].erasesize - 1)))
+ return -EINVAL;
/* Remember the erase region we start on */
first = i;
@@ -409,7 +410,8 @@ static int flash_erase (struct mtd_info *mtd,struct erase_info *instr)
i--;
/* is the end aligned on a block boundary? */
- if ((instr->addr + instr->len) & (mtd->eraseregions[i].erasesize - 1)) return (-EINVAL);
+ if (i < 0 || ((instr->addr + instr->len) & (mtd->eraseregions[i].erasesize - 1)))
+ return -EINVAL;
addr = instr->addr;
len = instr->len;
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index eb495d83064f..379c316f329e 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -44,6 +44,11 @@
#define OPCODE_SE 0xd8 /* Sector erase (usually 64KiB) */
#define OPCODE_RDID 0x9f /* Read JEDEC ID */
+/* Used for SST flashes only. */
+#define OPCODE_BP 0x02 /* Byte program */
+#define OPCODE_WRDI 0x04 /* Write disable */
+#define OPCODE_AAI_WP 0xad /* Auto address increment word program */
+
/* Status Register bits. */
#define SR_WIP 1 /* Write in progress */
#define SR_WEL 2 /* Write enable latch */
@@ -132,6 +137,15 @@ static inline int write_enable(struct m25p *flash)
return spi_write_then_read(flash->spi, &code, 1, NULL, 0);
}
+/*
+ * Send write disble instruction to the chip.
+ */
+static inline int write_disable(struct m25p *flash)
+{
+ u8 code = OPCODE_WRDI;
+
+ return spi_write_then_read(flash->spi, &code, 1, NULL, 0);
+}
/*
* Service routine to read status register until ready, or timeout occurs.
@@ -454,6 +468,111 @@ static int m25p80_write(struct mtd_info *mtd, loff_t to, size_t len,
return 0;
}
+static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf)
+{
+ struct m25p *flash = mtd_to_m25p(mtd);
+ struct spi_transfer t[2];
+ struct spi_message m;
+ size_t actual;
+ int cmd_sz, ret;
+
+ if (retlen)
+ *retlen = 0;
+
+ /* sanity checks */
+ if (!len)
+ return 0;
+
+ if (to + len > flash->mtd.size)
+ return -EINVAL;
+
+ spi_message_init(&m);
+ memset(t, 0, (sizeof t));
+
+ t[0].tx_buf = flash->command;
+ t[0].len = CMD_SIZE;
+ spi_message_add_tail(&t[0], &m);
+
+ t[1].tx_buf = buf;
+ spi_message_add_tail(&t[1], &m);
+
+ mutex_lock(&flash->lock);
+
+ /* Wait until finished previous write command. */
+ ret = wait_till_ready(flash);
+ if (ret)
+ goto time_out;
+
+ write_enable(flash);
+
+ actual = to % 2;
+ /* Start write from odd address. */
+ if (actual) {
+ flash->command[0] = OPCODE_BP;
+ flash->command[1] = to >> 16;
+ flash->command[2] = to >> 8;
+ flash->command[3] = to;
+
+ /* write one byte. */
+ t[1].len = 1;
+ spi_sync(flash->spi, &m);
+ ret = wait_till_ready(flash);
+ if (ret)
+ goto time_out;
+ *retlen += m.actual_length - CMD_SIZE;
+ }
+ to += actual;
+
+ flash->command[0] = OPCODE_AAI_WP;
+ flash->command[1] = to >> 16;
+ flash->command[2] = to >> 8;
+ flash->command[3] = to;
+
+ /* Write out most of the data here. */
+ cmd_sz = CMD_SIZE;
+ for (; actual < len - 1; actual += 2) {
+ t[0].len = cmd_sz;
+ /* write two bytes. */
+ t[1].len = 2;
+ t[1].tx_buf = buf + actual;
+
+ spi_sync(flash->spi, &m);
+ ret = wait_till_ready(flash);
+ if (ret)
+ goto time_out;
+ *retlen += m.actual_length - cmd_sz;
+ cmd_sz = 1;
+ to += 2;
+ }
+ write_disable(flash);
+ ret = wait_till_ready(flash);
+ if (ret)
+ goto time_out;
+
+ /* Write out trailing byte if it exists. */
+ if (actual != len) {
+ write_enable(flash);
+ flash->command[0] = OPCODE_BP;
+ flash->command[1] = to >> 16;
+ flash->command[2] = to >> 8;
+ flash->command[3] = to;
+ t[0].len = CMD_SIZE;
+ t[1].len = 1;
+ t[1].tx_buf = buf + actual;
+
+ spi_sync(flash->spi, &m);
+ ret = wait_till_ready(flash);
+ if (ret)
+ goto time_out;
+ *retlen += m.actual_length - CMD_SIZE;
+ write_disable(flash);
+ }
+
+time_out:
+ mutex_unlock(&flash->lock);
+ return ret;
+}
/****************************************************************************/
@@ -501,7 +620,10 @@ static struct flash_info __devinitdata m25p_data [] = {
{ "at26df321", 0x1f4701, 0, 64 * 1024, 64, SECT_4K, },
/* Macronix */
+ { "mx25l3205d", 0xc22016, 0, 64 * 1024, 64, },
+ { "mx25l6405d", 0xc22017, 0, 64 * 1024, 128, },
{ "mx25l12805d", 0xc22018, 0, 64 * 1024, 256, },
+ { "mx25l12855e", 0xc22618, 0, 64 * 1024, 256, },
/* Spansion -- single (large) sector size only, at least
* for the chips listed here (without boot sectors).
@@ -511,14 +633,20 @@ static struct flash_info __devinitdata m25p_data [] = {
{ "s25sl016a", 0x010214, 0, 64 * 1024, 32, },
{ "s25sl032a", 0x010215, 0, 64 * 1024, 64, },
{ "s25sl064a", 0x010216, 0, 64 * 1024, 128, },
- { "s25sl12800", 0x012018, 0x0300, 256 * 1024, 64, },
+ { "s25sl12800", 0x012018, 0x0300, 256 * 1024, 64, },
{ "s25sl12801", 0x012018, 0x0301, 64 * 1024, 256, },
+ { "s25fl129p0", 0x012018, 0x4d00, 256 * 1024, 64, },
+ { "s25fl129p1", 0x012018, 0x4d01, 64 * 1024, 256, },
/* SST -- large erase sizes are "overlays", "sectors" are 4K */
{ "sst25vf040b", 0xbf258d, 0, 64 * 1024, 8, SECT_4K, },
{ "sst25vf080b", 0xbf258e, 0, 64 * 1024, 16, SECT_4K, },
{ "sst25vf016b", 0xbf2541, 0, 64 * 1024, 32, SECT_4K, },
{ "sst25vf032b", 0xbf254a, 0, 64 * 1024, 64, SECT_4K, },
+ { "sst25wf512", 0xbf2501, 0, 64 * 1024, 1, SECT_4K, },
+ { "sst25wf010", 0xbf2502, 0, 64 * 1024, 2, SECT_4K, },
+ { "sst25wf020", 0xbf2503, 0, 64 * 1024, 4, SECT_4K, },
+ { "sst25wf040", 0xbf2504, 0, 64 * 1024, 8, SECT_4K, },
/* ST Microelectronics -- newer production may have feature updates */
{ "m25p05", 0x202010, 0, 32 * 1024, 2, },
@@ -667,7 +795,12 @@ static int __devinit m25p_probe(struct spi_device *spi)
flash->mtd.size = info->sector_size * info->n_sectors;
flash->mtd.erase = m25p80_erase;
flash->mtd.read = m25p80_read;
- flash->mtd.write = m25p80_write;
+
+ /* sst flash chips use AAI word program */
+ if (info->jedec_id >> 16 == 0xbf)
+ flash->mtd.write = sst_write;
+ else
+ flash->mtd.write = m25p80_write;
/* prefer "small sector" erase if possible */
if (info->flags & SECT_4K) {
diff --git a/drivers/mtd/devices/mtd_dataflash.c b/drivers/mtd/devices/mtd_dataflash.c
index 211c27acd01e..93e3627be74c 100644
--- a/drivers/mtd/devices/mtd_dataflash.c
+++ b/drivers/mtd/devices/mtd_dataflash.c
@@ -401,7 +401,7 @@ static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len,
(void) dataflash_waitready(priv->spi);
-#ifdef CONFIG_MTD_DATAFLASH_VERIFY_WRITE
+#ifdef CONFIG_MTD_DATAFLASH_WRITE_VERIFY
/* (3) Compare to Buffer1 */
addr = pageaddr << priv->page_offset;
@@ -430,7 +430,7 @@ static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len,
} else
status = 0;
-#endif /* CONFIG_MTD_DATAFLASH_VERIFY_WRITE */
+#endif /* CONFIG_MTD_DATAFLASH_WRITE_VERIFY */
remaining = remaining - writelen;
pageaddr++;
diff --git a/drivers/mtd/devices/phram.c b/drivers/mtd/devices/phram.c
index 088fbb7595b5..1696bbecaa7e 100644
--- a/drivers/mtd/devices/phram.c
+++ b/drivers/mtd/devices/phram.c
@@ -14,6 +14,9 @@
* Example:
* phram=swap,64Mi,128Mi phram=test,900Mi,1Mi
*/
+
+#define pr_fmt(fmt) "phram: " fmt
+
#include <asm/io.h>
#include <linux/init.h>
#include <linux/kernel.h>
@@ -23,8 +26,6 @@
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
-#define ERROR(fmt, args...) printk(KERN_ERR "phram: " fmt , ## args)
-
struct phram_mtd_list {
struct mtd_info mtd;
struct list_head list;
@@ -132,7 +133,7 @@ static int register_device(char *name, unsigned long start, unsigned long len)
ret = -EIO;
new->mtd.priv = ioremap(start, len);
if (!new->mtd.priv) {
- ERROR("ioremap failed\n");
+ pr_err("ioremap failed\n");
goto out1;
}
@@ -152,7 +153,7 @@ static int register_device(char *name, unsigned long start, unsigned long len)
ret = -EAGAIN;
if (add_mtd_device(&new->mtd)) {
- ERROR("Failed to register new device\n");
+ pr_err("Failed to register new device\n");
goto out2;
}
@@ -227,8 +228,8 @@ static inline void kill_final_newline(char *str)
#define parse_err(fmt, args...) do { \
- ERROR(fmt , ## args); \
- return 0; \
+ pr_err(fmt , ## args); \
+ return 1; \
} while (0)
static int phram_setup(const char *val, struct kernel_param *kp)
@@ -256,12 +257,8 @@ static int phram_setup(const char *val, struct kernel_param *kp)
parse_err("not enough arguments\n");
ret = parse_name(&name, token[0]);
- if (ret == -ENOMEM)
- parse_err("out of memory\n");
- if (ret == -ENOSPC)
- parse_err("name too long\n");
if (ret)
- return 0;
+ return ret;
ret = parse_num32(&start, token[1]);
if (ret) {
@@ -275,9 +272,11 @@ static int phram_setup(const char *val, struct kernel_param *kp)
parse_err("illegal device length\n");
}
- register_device(name, start, len);
+ ret = register_device(name, start, len);
+ if (!ret)
+ pr_info("%s device: %#x at %#x\n", name, len, start);
- return 0;
+ return ret;
}
module_param_call(phram, phram_setup, NULL, NULL, 000);
diff --git a/drivers/mtd/devices/slram.c b/drivers/mtd/devices/slram.c
index 7d846e9173da..3aa05cd18ea1 100644
--- a/drivers/mtd/devices/slram.c
+++ b/drivers/mtd/devices/slram.c
@@ -341,7 +341,7 @@ static int __init init_slram(void)
#else
int count;
- for (count = 0; (map[count]) && (count < SLRAM_MAX_DEVICES_PARAMS);
+ for (count = 0; count < SLRAM_MAX_DEVICES_PARAMS && map[count];
count++) {
}
diff --git a/drivers/mtd/devices/sst25l.c b/drivers/mtd/devices/sst25l.c
new file mode 100644
index 000000000000..c2baf3353f84
--- /dev/null
+++ b/drivers/mtd/devices/sst25l.c
@@ -0,0 +1,512 @@
+/*
+ * sst25l.c
+ *
+ * Driver for SST25L SPI Flash chips
+ *
+ * Copyright © 2009 Bluewater Systems Ltd
+ * Author: Andre Renaud <andre@bluewatersys.com>
+ * Author: Ryan Mallon <ryan@bluewatersys.com>
+ *
+ * Based on m25p80.c
+ *
+ * This code is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/interrupt.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+
+#include <linux/spi/spi.h>
+#include <linux/spi/flash.h>
+
+/* Erases can take up to 3 seconds! */
+#define MAX_READY_WAIT_JIFFIES msecs_to_jiffies(3000)
+
+#define SST25L_CMD_WRSR 0x01 /* Write status register */
+#define SST25L_CMD_WRDI 0x04 /* Write disable */
+#define SST25L_CMD_RDSR 0x05 /* Read status register */
+#define SST25L_CMD_WREN 0x06 /* Write enable */
+#define SST25L_CMD_READ 0x03 /* High speed read */
+
+#define SST25L_CMD_EWSR 0x50 /* Enable write status register */
+#define SST25L_CMD_SECTOR_ERASE 0x20 /* Erase sector */
+#define SST25L_CMD_READ_ID 0x90 /* Read device ID */
+#define SST25L_CMD_AAI_PROGRAM 0xaf /* Auto address increment */
+
+#define SST25L_STATUS_BUSY (1 << 0) /* Chip is busy */
+#define SST25L_STATUS_WREN (1 << 1) /* Write enabled */
+#define SST25L_STATUS_BP0 (1 << 2) /* Block protection 0 */
+#define SST25L_STATUS_BP1 (1 << 3) /* Block protection 1 */
+
+struct sst25l_flash {
+ struct spi_device *spi;
+ struct mutex lock;
+ struct mtd_info mtd;
+
+ int partitioned;
+};
+
+struct flash_info {
+ const char *name;
+ uint16_t device_id;
+ unsigned page_size;
+ unsigned nr_pages;
+ unsigned erase_size;
+};
+
+#define to_sst25l_flash(x) container_of(x, struct sst25l_flash, mtd)
+
+static struct flash_info __initdata sst25l_flash_info[] = {
+ {"sst25lf020a", 0xbf43, 256, 1024, 4096},
+ {"sst25lf040a", 0xbf44, 256, 2048, 4096},
+};
+
+static int sst25l_status(struct sst25l_flash *flash, int *status)
+{
+ unsigned char command, response;
+ int err;
+
+ command = SST25L_CMD_RDSR;
+ err = spi_write_then_read(flash->spi, &command, 1, &response, 1);
+ if (err < 0)
+ return err;
+
+ *status = response;
+ return 0;
+}
+
+static int sst25l_write_enable(struct sst25l_flash *flash, int enable)
+{
+ unsigned char command[2];
+ int status, err;
+
+ command[0] = enable ? SST25L_CMD_WREN : SST25L_CMD_WRDI;
+ err = spi_write(flash->spi, command, 1);
+ if (err)
+ return err;
+
+ command[0] = SST25L_CMD_EWSR;
+ err = spi_write(flash->spi, command, 1);
+ if (err)
+ return err;
+
+ command[0] = SST25L_CMD_WRSR;
+ command[1] = enable ? 0 : SST25L_STATUS_BP0 | SST25L_STATUS_BP1;
+ err = spi_write(flash->spi, command, 2);
+ if (err)
+ return err;
+
+ if (enable) {
+ err = sst25l_status(flash, &status);
+ if (err)
+ return err;
+ if (!(status & SST25L_STATUS_WREN))
+ return -EROFS;
+ }
+
+ return 0;
+}
+
+static int sst25l_wait_till_ready(struct sst25l_flash *flash)
+{
+ unsigned long deadline;
+ int status, err;
+
+ deadline = jiffies + MAX_READY_WAIT_JIFFIES;
+ do {
+ err = sst25l_status(flash, &status);
+ if (err)
+ return err;
+ if (!(status & SST25L_STATUS_BUSY))
+ return 0;
+
+ cond_resched();
+ } while (!time_after_eq(jiffies, deadline));
+
+ return -ETIMEDOUT;
+}
+
+static int sst25l_erase_sector(struct sst25l_flash *flash, uint32_t offset)
+{
+ unsigned char command[4];
+ int err;
+
+ err = sst25l_write_enable(flash, 1);
+ if (err)
+ return err;
+
+ command[0] = SST25L_CMD_SECTOR_ERASE;
+ command[1] = offset >> 16;
+ command[2] = offset >> 8;
+ command[3] = offset;
+ err = spi_write(flash->spi, command, 4);
+ if (err)
+ return err;
+
+ err = sst25l_wait_till_ready(flash);
+ if (err)
+ return err;
+
+ return sst25l_write_enable(flash, 0);
+}
+
+static int sst25l_erase(struct mtd_info *mtd, struct erase_info *instr)
+{
+ struct sst25l_flash *flash = to_sst25l_flash(mtd);
+ uint32_t addr, end;
+ int err;
+
+ /* Sanity checks */
+ if (instr->addr + instr->len > flash->mtd.size)
+ return -EINVAL;
+
+ if ((uint32_t)instr->len % mtd->erasesize)
+ return -EINVAL;
+
+ if ((uint32_t)instr->addr % mtd->erasesize)
+ return -EINVAL;
+
+ addr = instr->addr;
+ end = addr + instr->len;
+
+ mutex_lock(&flash->lock);
+
+ err = sst25l_wait_till_ready(flash);
+ if (err) {
+ mutex_unlock(&flash->lock);
+ return err;
+ }
+
+ while (addr < end) {
+ err = sst25l_erase_sector(flash, addr);
+ if (err) {
+ mutex_unlock(&flash->lock);
+ instr->state = MTD_ERASE_FAILED;
+ dev_err(&flash->spi->dev, "Erase failed\n");
+ return err;
+ }
+
+ addr += mtd->erasesize;
+ }
+
+ mutex_unlock(&flash->lock);
+
+ instr->state = MTD_ERASE_DONE;
+ mtd_erase_callback(instr);
+ return 0;
+}
+
+static int sst25l_read(struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, unsigned char *buf)
+{
+ struct sst25l_flash *flash = to_sst25l_flash(mtd);
+ struct spi_transfer transfer[2];
+ struct spi_message message;
+ unsigned char command[4];
+ int ret;
+
+ /* Sanity checking */
+ if (len == 0)
+ return 0;
+
+ if (from + len > flash->mtd.size)
+ return -EINVAL;
+
+ if (retlen)
+ *retlen = 0;
+
+ spi_message_init(&message);
+ memset(&transfer, 0, sizeof(transfer));
+
+ command[0] = SST25L_CMD_READ;
+ command[1] = from >> 16;
+ command[2] = from >> 8;
+ command[3] = from;
+
+ transfer[0].tx_buf = command;
+ transfer[0].len = sizeof(command);
+ spi_message_add_tail(&transfer[0], &message);
+
+ transfer[1].rx_buf = buf;
+ transfer[1].len = len;
+ spi_message_add_tail(&transfer[1], &message);
+
+ mutex_lock(&flash->lock);
+
+ /* Wait for previous write/erase to complete */
+ ret = sst25l_wait_till_ready(flash);
+ if (ret) {
+ mutex_unlock(&flash->lock);
+ return ret;
+ }
+
+ spi_sync(flash->spi, &message);
+
+ if (retlen && message.actual_length > sizeof(command))
+ *retlen += message.actual_length - sizeof(command);
+
+ mutex_unlock(&flash->lock);
+ return 0;
+}
+
+static int sst25l_write(struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const unsigned char *buf)
+{
+ struct sst25l_flash *flash = to_sst25l_flash(mtd);
+ int i, j, ret, bytes, copied = 0;
+ unsigned char command[5];
+
+ /* Sanity checks */
+ if (!len)
+ return 0;
+
+ if (to + len > flash->mtd.size)
+ return -EINVAL;
+
+ if ((uint32_t)to % mtd->writesize)
+ return -EINVAL;
+
+ mutex_lock(&flash->lock);
+
+ ret = sst25l_write_enable(flash, 1);
+ if (ret)
+ goto out;
+
+ for (i = 0; i < len; i += mtd->writesize) {
+ ret = sst25l_wait_till_ready(flash);
+ if (ret)
+ goto out;
+
+ /* Write the first byte of the page */
+ command[0] = SST25L_CMD_AAI_PROGRAM;
+ command[1] = (to + i) >> 16;
+ command[2] = (to + i) >> 8;
+ command[3] = (to + i);
+ command[4] = buf[i];
+ ret = spi_write(flash->spi, command, 5);
+ if (ret < 0)
+ goto out;
+ copied++;
+
+ /*
+ * Write the remaining bytes using auto address
+ * increment mode
+ */
+ bytes = min_t(uint32_t, mtd->writesize, len - i);
+ for (j = 1; j < bytes; j++, copied++) {
+ ret = sst25l_wait_till_ready(flash);
+ if (ret)
+ goto out;
+
+ command[1] = buf[i + j];
+ ret = spi_write(flash->spi, command, 2);
+ if (ret)
+ goto out;
+ }
+ }
+
+out:
+ ret = sst25l_write_enable(flash, 0);
+
+ if (retlen)
+ *retlen = copied;
+
+ mutex_unlock(&flash->lock);
+ return ret;
+}
+
+static struct flash_info *__init sst25l_match_device(struct spi_device *spi)
+{
+ struct flash_info *flash_info = NULL;
+ unsigned char command[4], response;
+ int i, err;
+ uint16_t id;
+
+ command[0] = SST25L_CMD_READ_ID;
+ command[1] = 0;
+ command[2] = 0;
+ command[3] = 0;
+ err = spi_write_then_read(spi, command, sizeof(command), &response, 1);
+ if (err < 0) {
+ dev_err(&spi->dev, "error reading device id msb\n");
+ return NULL;
+ }
+
+ id = response << 8;
+
+ command[0] = SST25L_CMD_READ_ID;
+ command[1] = 0;
+ command[2] = 0;
+ command[3] = 1;
+ err = spi_write_then_read(spi, command, sizeof(command), &response, 1);
+ if (err < 0) {
+ dev_err(&spi->dev, "error reading device id lsb\n");
+ return NULL;
+ }
+
+ id |= response;
+
+ for (i = 0; i < ARRAY_SIZE(sst25l_flash_info); i++)
+ if (sst25l_flash_info[i].device_id == id)
+ flash_info = &sst25l_flash_info[i];
+
+ if (!flash_info)
+ dev_err(&spi->dev, "unknown id %.4x\n", id);
+
+ return flash_info;
+}
+
+static int __init sst25l_probe(struct spi_device *spi)
+{
+ struct flash_info *flash_info;
+ struct sst25l_flash *flash;
+ struct flash_platform_data *data;
+ int ret, i;
+
+ flash_info = sst25l_match_device(spi);
+ if (!flash_info)
+ return -ENODEV;
+
+ flash = kzalloc(sizeof(struct sst25l_flash), GFP_KERNEL);
+ if (!flash)
+ return -ENOMEM;
+
+ flash->spi = spi;
+ mutex_init(&flash->lock);
+ dev_set_drvdata(&spi->dev, flash);
+
+ data = spi->dev.platform_data;
+ if (data && data->name)
+ flash->mtd.name = data->name;
+ else
+ flash->mtd.name = dev_name(&spi->dev);
+
+ flash->mtd.type = MTD_NORFLASH;
+ flash->mtd.flags = MTD_CAP_NORFLASH;
+ flash->mtd.erasesize = flash_info->erase_size;
+ flash->mtd.writesize = flash_info->page_size;
+ flash->mtd.size = flash_info->page_size * flash_info->nr_pages;
+ flash->mtd.erase = sst25l_erase;
+ flash->mtd.read = sst25l_read;
+ flash->mtd.write = sst25l_write;
+
+ dev_info(&spi->dev, "%s (%lld KiB)\n", flash_info->name,
+ (long long)flash->mtd.size >> 10);
+
+ DEBUG(MTD_DEBUG_LEVEL2,
+ "mtd .name = %s, .size = 0x%llx (%lldMiB) "
+ ".erasesize = 0x%.8x (%uKiB) .numeraseregions = %d\n",
+ flash->mtd.name,
+ (long long)flash->mtd.size, (long long)(flash->mtd.size >> 20),
+ flash->mtd.erasesize, flash->mtd.erasesize / 1024,
+ flash->mtd.numeraseregions);
+
+ if (flash->mtd.numeraseregions)
+ for (i = 0; i < flash->mtd.numeraseregions; i++)
+ DEBUG(MTD_DEBUG_LEVEL2,
+ "mtd.eraseregions[%d] = { .offset = 0x%llx, "
+ ".erasesize = 0x%.8x (%uKiB), "
+ ".numblocks = %d }\n",
+ i, (long long)flash->mtd.eraseregions[i].offset,
+ flash->mtd.eraseregions[i].erasesize,
+ flash->mtd.eraseregions[i].erasesize / 1024,
+ flash->mtd.eraseregions[i].numblocks);
+
+ if (mtd_has_partitions()) {
+ struct mtd_partition *parts = NULL;
+ int nr_parts = 0;
+
+ if (mtd_has_cmdlinepart()) {
+ static const char *part_probes[] =
+ {"cmdlinepart", NULL};
+
+ nr_parts = parse_mtd_partitions(&flash->mtd,
+ part_probes,
+ &parts, 0);
+ }
+
+ if (nr_parts <= 0 && data && data->parts) {
+ parts = data->parts;
+ nr_parts = data->nr_parts;
+ }
+
+ if (nr_parts > 0) {
+ for (i = 0; i < nr_parts; i++) {
+ DEBUG(MTD_DEBUG_LEVEL2, "partitions[%d] = "
+ "{.name = %s, .offset = 0x%llx, "
+ ".size = 0x%llx (%lldKiB) }\n",
+ i, parts[i].name,
+ (long long)parts[i].offset,
+ (long long)parts[i].size,
+ (long long)(parts[i].size >> 10));
+ }
+
+ flash->partitioned = 1;
+ return add_mtd_partitions(&flash->mtd,
+ parts, nr_parts);
+ }
+
+ } else if (data->nr_parts) {
+ dev_warn(&spi->dev, "ignoring %d default partitions on %s\n",
+ data->nr_parts, data->name);
+ }
+
+ ret = add_mtd_device(&flash->mtd);
+ if (ret == 1) {
+ kfree(flash);
+ dev_set_drvdata(&spi->dev, NULL);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int __exit sst25l_remove(struct spi_device *spi)
+{
+ struct sst25l_flash *flash = dev_get_drvdata(&spi->dev);
+ int ret;
+
+ if (mtd_has_partitions() && flash->partitioned)
+ ret = del_mtd_partitions(&flash->mtd);
+ else
+ ret = del_mtd_device(&flash->mtd);
+ if (ret == 0)
+ kfree(flash);
+ return ret;
+}
+
+static struct spi_driver sst25l_driver = {
+ .driver = {
+ .name = "sst25l",
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+ .probe = sst25l_probe,
+ .remove = __exit_p(sst25l_remove),
+};
+
+static int __init sst25l_init(void)
+{
+ return spi_register_driver(&sst25l_driver);
+}
+
+static void __exit sst25l_exit(void)
+{
+ spi_unregister_driver(&sst25l_driver);
+}
+
+module_init(sst25l_init);
+module_exit(sst25l_exit);
+
+MODULE_DESCRIPTION("MTD SPI driver for SST25L Flash chips");
+MODULE_AUTHOR("Andre Renaud <andre@bluewatersys.com>, "
+ "Ryan Mallon <ryan@bluewatersys.com>");
+MODULE_LICENSE("GPL");