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path: root/drivers/mtd/devices/m25p80.c
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Diffstat (limited to 'drivers/mtd/devices/m25p80.c')
-rw-r--r--drivers/mtd/devices/m25p80.c226
1 files changed, 209 insertions, 17 deletions
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 7eda71dbc183..ad1913909702 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -41,6 +41,7 @@
#define OPCODE_WRSR 0x01 /* Write status register 1 byte */
#define OPCODE_NORM_READ 0x03 /* Read data bytes (low frequency) */
#define OPCODE_FAST_READ 0x0b /* Read data bytes (high frequency) */
+#define OPCODE_QUAD_READ 0x6b /* Read data bytes */
#define OPCODE_PP 0x02 /* Page program (up to 256 bytes) */
#define OPCODE_BE_4K 0x20 /* Erase 4KiB block */
#define OPCODE_BE_4K_PMC 0xd7 /* Erase 4KiB block on PMC chips */
@@ -48,10 +49,12 @@
#define OPCODE_CHIP_ERASE 0xc7 /* Erase whole flash chip */
#define OPCODE_SE 0xd8 /* Sector erase (usually 64KiB) */
#define OPCODE_RDID 0x9f /* Read JEDEC ID */
+#define OPCODE_RDCR 0x35 /* Read configuration register */
/* 4-byte address opcodes - used on Spansion and some Macronix flashes. */
#define OPCODE_NORM_READ_4B 0x13 /* Read data bytes (low frequency) */
#define OPCODE_FAST_READ_4B 0x0c /* Read data bytes (high frequency) */
+#define OPCODE_QUAD_READ_4B 0x6c /* Read data bytes */
#define OPCODE_PP_4B 0x12 /* Page program (up to 256 bytes) */
#define OPCODE_SE_4B 0xdc /* Sector erase (usually 64KiB) */
@@ -76,6 +79,11 @@
#define SR_BP2 0x10 /* Block protect 2 */
#define SR_SRWD 0x80 /* SR write protect */
+#define SR_QUAD_EN_MX 0x40 /* Macronix Quad I/O */
+
+/* Configuration Register bits. */
+#define CR_QUAD_EN_SPAN 0x2 /* Spansion Quad I/O */
+
/* Define max times to check status register before we give up. */
#define MAX_READY_WAIT_JIFFIES (40 * HZ) /* M25P16 specs 40s max chip erase */
#define MAX_CMD_SIZE 6
@@ -84,6 +92,12 @@
/****************************************************************************/
+enum read_type {
+ M25P80_NORMAL = 0,
+ M25P80_FAST,
+ M25P80_QUAD,
+};
+
struct m25p {
struct spi_device *spi;
struct mutex lock;
@@ -94,7 +108,7 @@ struct m25p {
u8 read_opcode;
u8 program_opcode;
u8 *command;
- bool fast_read;
+ enum read_type flash_read;
};
static inline struct m25p *mtd_to_m25p(struct mtd_info *mtd)
@@ -131,6 +145,26 @@ static int read_sr(struct m25p *flash)
}
/*
+ * Read configuration register, returning its value in the
+ * location. Return the configuration register value.
+ * Returns negative if error occured.
+ */
+static int read_cr(struct m25p *flash)
+{
+ u8 code = OPCODE_RDCR;
+ int ret;
+ u8 val;
+
+ ret = spi_write_then_read(flash->spi, &code, 1, &val, 1);
+ if (ret < 0) {
+ dev_err(&flash->spi->dev, "error %d reading CR\n", ret);
+ return ret;
+ }
+
+ return val;
+}
+
+/*
* Write status register 1 byte
* Returns negative if error occurred.
*/
@@ -220,6 +254,93 @@ static int wait_till_ready(struct m25p *flash)
}
/*
+ * Write status Register and configuration register with 2 bytes
+ * The first byte will be written to the status register, while the
+ * second byte will be written to the configuration register.
+ * Return negative if error occured.
+ */
+static int write_sr_cr(struct m25p *flash, u16 val)
+{
+ flash->command[0] = OPCODE_WRSR;
+ flash->command[1] = val & 0xff;
+ flash->command[2] = (val >> 8);
+
+ return spi_write(flash->spi, flash->command, 3);
+}
+
+static int macronix_quad_enable(struct m25p *flash)
+{
+ int ret, val;
+ u8 cmd[2];
+ cmd[0] = OPCODE_WRSR;
+
+ val = read_sr(flash);
+ cmd[1] = val | SR_QUAD_EN_MX;
+ write_enable(flash);
+
+ spi_write(flash->spi, &cmd, 2);
+
+ if (wait_till_ready(flash))
+ return 1;
+
+ ret = read_sr(flash);
+ if (!(ret > 0 && (ret & SR_QUAD_EN_MX))) {
+ dev_err(&flash->spi->dev, "Macronix Quad bit not set\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int spansion_quad_enable(struct m25p *flash)
+{
+ int ret;
+ int quad_en = CR_QUAD_EN_SPAN << 8;
+
+ write_enable(flash);
+
+ ret = write_sr_cr(flash, quad_en);
+ if (ret < 0) {
+ dev_err(&flash->spi->dev,
+ "error while writing configuration register\n");
+ return -EINVAL;
+ }
+
+ /* read back and check it */
+ ret = read_cr(flash);
+ if (!(ret > 0 && (ret & CR_QUAD_EN_SPAN))) {
+ dev_err(&flash->spi->dev, "Spansion Quad bit not set\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int set_quad_mode(struct m25p *flash, u32 jedec_id)
+{
+ int status;
+
+ switch (JEDEC_MFR(jedec_id)) {
+ case CFI_MFR_MACRONIX:
+ status = macronix_quad_enable(flash);
+ if (status) {
+ dev_err(&flash->spi->dev,
+ "Macronix quad-read not enabled\n");
+ return -EINVAL;
+ }
+ return status;
+ default:
+ status = spansion_quad_enable(flash);
+ if (status) {
+ dev_err(&flash->spi->dev,
+ "Spansion quad-read not enabled\n");
+ return -EINVAL;
+ }
+ return status;
+ }
+}
+
+/*
* Erase the whole flash memory
*
* Returns 0 if successful, non-zero otherwise.
@@ -350,6 +471,35 @@ static int m25p80_erase(struct mtd_info *mtd, struct erase_info *instr)
}
/*
+ * Dummy Cycle calculation for different type of read.
+ * It can be used to support more commands with
+ * different dummy cycle requirements.
+ */
+static inline int m25p80_dummy_cycles_read(struct m25p *flash)
+{
+ switch (flash->flash_read) {
+ case M25P80_FAST:
+ case M25P80_QUAD:
+ return 1;
+ case M25P80_NORMAL:
+ return 0;
+ default:
+ dev_err(&flash->spi->dev, "No valid read type supported\n");
+ return -1;
+ }
+}
+
+static inline unsigned int m25p80_rx_nbits(const struct m25p *flash)
+{
+ switch (flash->flash_read) {
+ case M25P80_QUAD:
+ return 4;
+ default:
+ return 0;
+ }
+}
+
+/*
* Read an address range from the flash chip. The address range
* may be any size provided it is within the physical boundaries.
*/
@@ -360,6 +510,7 @@ static int m25p80_read(struct mtd_info *mtd, loff_t from, size_t len,
struct spi_transfer t[2];
struct spi_message m;
uint8_t opcode;
+ int dummy;
pr_debug("%s: %s from 0x%08x, len %zd\n", dev_name(&flash->spi->dev),
__func__, (u32)from, len);
@@ -367,11 +518,18 @@ static int m25p80_read(struct mtd_info *mtd, loff_t from, size_t len,
spi_message_init(&m);
memset(t, 0, (sizeof t));
+ dummy = m25p80_dummy_cycles_read(flash);
+ if (dummy < 0) {
+ dev_err(&flash->spi->dev, "No valid read command supported\n");
+ return -EINVAL;
+ }
+
t[0].tx_buf = flash->command;
- t[0].len = m25p_cmdsz(flash) + (flash->fast_read ? 1 : 0);
+ t[0].len = m25p_cmdsz(flash) + dummy;
spi_message_add_tail(&t[0], &m);
t[1].rx_buf = buf;
+ t[1].rx_nbits = m25p80_rx_nbits(flash);
t[1].len = len;
spi_message_add_tail(&t[1], &m);
@@ -391,8 +549,7 @@ static int m25p80_read(struct mtd_info *mtd, loff_t from, size_t len,
spi_sync(flash->spi, &m);
- *retlen = m.actual_length - m25p_cmdsz(flash) -
- (flash->fast_read ? 1 : 0);
+ *retlen = m.actual_length - m25p_cmdsz(flash) - dummy;
mutex_unlock(&flash->lock);
@@ -698,6 +855,7 @@ struct flash_info {
#define SST_WRITE 0x04 /* use SST byte programming */
#define M25P_NO_FR 0x08 /* Can't do fastread */
#define SECT_4K_PMC 0x10 /* OPCODE_BE_4K_PMC works uniformly */
+#define M25P80_QUAD_READ 0x20 /* Flash supports Quad Read */
};
#define INFO(_jedec_id, _ext_id, _sector_size, _n_sectors, _flags) \
@@ -775,7 +933,7 @@ static const struct spi_device_id m25p_ids[] = {
{ "mx25l12855e", INFO(0xc22618, 0, 64 * 1024, 256, 0) },
{ "mx25l25635e", INFO(0xc22019, 0, 64 * 1024, 512, 0) },
{ "mx25l25655e", INFO(0xc22619, 0, 64 * 1024, 512, 0) },
- { "mx66l51235l", INFO(0xc2201a, 0, 64 * 1024, 1024, 0) },
+ { "mx66l51235l", INFO(0xc2201a, 0, 64 * 1024, 1024, M25P80_QUAD_READ) },
/* Micron */
{ "n25q064", INFO(0x20ba17, 0, 64 * 1024, 128, 0) },
@@ -795,8 +953,8 @@ static const struct spi_device_id m25p_ids[] = {
{ "s25sl032p", INFO(0x010215, 0x4d00, 64 * 1024, 64, 0) },
{ "s25sl064p", INFO(0x010216, 0x4d00, 64 * 1024, 128, 0) },
{ "s25fl256s0", INFO(0x010219, 0x4d00, 256 * 1024, 128, 0) },
- { "s25fl256s1", INFO(0x010219, 0x4d01, 64 * 1024, 512, 0) },
- { "s25fl512s", INFO(0x010220, 0x4d00, 256 * 1024, 256, 0) },
+ { "s25fl256s1", INFO(0x010219, 0x4d01, 64 * 1024, 512, M25P80_QUAD_READ) },
+ { "s25fl512s", INFO(0x010220, 0x4d00, 256 * 1024, 256, M25P80_QUAD_READ) },
{ "s70fl01gs", INFO(0x010221, 0x4d00, 256 * 1024, 256, 0) },
{ "s25sl12800", INFO(0x012018, 0x0300, 256 * 1024, 64, 0) },
{ "s25sl12801", INFO(0x012018, 0x0301, 64 * 1024, 256, 0) },
@@ -851,6 +1009,7 @@ static const struct spi_device_id m25p_ids[] = {
{ "m25pe80", INFO(0x208014, 0, 64 * 1024, 16, 0) },
{ "m25pe16", INFO(0x208015, 0, 64 * 1024, 32, SECT_4K) },
+ { "m25px16", INFO(0x207115, 0, 64 * 1024, 32, SECT_4K) },
{ "m25px32", INFO(0x207116, 0, 64 * 1024, 64, SECT_4K) },
{ "m25px32-s0", INFO(0x207316, 0, 64 * 1024, 64, SECT_4K) },
{ "m25px32-s1", INFO(0x206316, 0, 64 * 1024, 64, SECT_4K) },
@@ -937,6 +1096,7 @@ static int m25p_probe(struct spi_device *spi)
unsigned i;
struct mtd_part_parser_data ppdata;
struct device_node *np = spi->dev.of_node;
+ int ret;
/* Platform data helps sort out which chip type we have, as
* well as how this board partitions it. If we don't have
@@ -1051,22 +1211,46 @@ static int m25p_probe(struct spi_device *spi)
flash->page_size = info->page_size;
flash->mtd.writebufsize = flash->page_size;
- if (np)
+ if (np) {
/* If we were instantiated by DT, use it */
- flash->fast_read = of_property_read_bool(np, "m25p,fast-read");
- else
+ if (of_property_read_bool(np, "m25p,fast-read"))
+ flash->flash_read = M25P80_FAST;
+ else
+ flash->flash_read = M25P80_NORMAL;
+ } else {
/* If we weren't instantiated by DT, default to fast-read */
- flash->fast_read = true;
+ flash->flash_read = M25P80_FAST;
+ }
/* Some devices cannot do fast-read, no matter what DT tells us */
if (info->flags & M25P_NO_FR)
- flash->fast_read = false;
+ flash->flash_read = M25P80_NORMAL;
+
+ /* Quad-read mode takes precedence over fast/normal */
+ if (spi->mode & SPI_RX_QUAD && info->flags & M25P80_QUAD_READ) {
+ ret = set_quad_mode(flash, info->jedec_id);
+ if (ret) {
+ dev_err(&flash->spi->dev, "quad mode not supported\n");
+ return ret;
+ }
+ flash->flash_read = M25P80_QUAD;
+ }
/* Default commands */
- if (flash->fast_read)
+ switch (flash->flash_read) {
+ case M25P80_QUAD:
+ flash->read_opcode = OPCODE_QUAD_READ;
+ break;
+ case M25P80_FAST:
flash->read_opcode = OPCODE_FAST_READ;
- else
+ break;
+ case M25P80_NORMAL:
flash->read_opcode = OPCODE_NORM_READ;
+ break;
+ default:
+ dev_err(&flash->spi->dev, "No Read opcode defined\n");
+ return -EINVAL;
+ }
flash->program_opcode = OPCODE_PP;
@@ -1077,9 +1261,17 @@ static int m25p_probe(struct spi_device *spi)
flash->addr_width = 4;
if (JEDEC_MFR(info->jedec_id) == CFI_MFR_AMD) {
/* Dedicated 4-byte command set */
- flash->read_opcode = flash->fast_read ?
- OPCODE_FAST_READ_4B :
- OPCODE_NORM_READ_4B;
+ switch (flash->flash_read) {
+ case M25P80_QUAD:
+ flash->read_opcode = OPCODE_QUAD_READ_4B;
+ break;
+ case M25P80_FAST:
+ flash->read_opcode = OPCODE_FAST_READ_4B;
+ break;
+ case M25P80_NORMAL:
+ flash->read_opcode = OPCODE_NORM_READ_4B;
+ break;
+ }
flash->program_opcode = OPCODE_PP_4B;
/* No small sector erase for 4-byte command set */
flash->erase_opcode = OPCODE_SE_4B;
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-28 00:58:21 +0300