[linux-next RFC v7 4/6] mtd: m25p80: add support of dual and quad spi protocols to all commands
Cyrille Pitchen
cyrille.pitchen at atmel.com
Tue Sep 15 08:28:02 PDT 2015
Before this patch, m25p80_read() supported few SPI protocols:
- regular SPI 1-1-1
- SPI Dual Output 1-1-2
- SPI Quad Output 1-1-4
On the other hand, all other m25p80_*() hooks only supported SPI 1-1-1.
However once their Quad mode enabled, Micron and Macronix spi-nor memories
expect all commands to use the SPI 4-4-4 protocol.
Also, once their Dual mode enabled, Micron spi-nor memories expect all
commands to use the SPI-2-2-2 protocol.
So this patch adds support to all currently existing SPI protocols to
cover as many protocols as possible.
Signed-off-by: Cyrille Pitchen <cyrille.pitchen at atmel.com>
---
drivers/mtd/devices/m25p80.c | 254 ++++++++++++++++++++++++++++++++++++-------
1 file changed, 212 insertions(+), 42 deletions(-)
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 1457866a4930..96072b33b29f 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -27,22 +27,110 @@
#include <linux/spi/flash.h>
#include <linux/mtd/spi-nor.h>
-#define MAX_CMD_SIZE 6
+#define MAX_CMD_SIZE 8
struct m25p {
struct spi_device *spi;
struct spi_nor spi_nor;
u8 command[MAX_CMD_SIZE];
};
+static inline int m25p80_proto2nbits(enum spi_protocol proto,
+ unsigned *code_nbits,
+ unsigned *addr_nbits,
+ unsigned *data_nbits)
+{
+ unsigned code, addr, data;
+
+ switch (proto) {
+ case SPI_PROTO_1_1_1:
+ code = SPI_NBITS_SINGLE;
+ addr = SPI_NBITS_SINGLE;
+ data = SPI_NBITS_SINGLE;
+ break;
+
+ case SPI_PROTO_1_1_2:
+ code = SPI_NBITS_SINGLE;
+ addr = SPI_NBITS_SINGLE;
+ data = SPI_NBITS_DUAL;
+ break;
+
+ case SPI_PROTO_1_1_4:
+ code = SPI_NBITS_SINGLE;
+ addr = SPI_NBITS_SINGLE;
+ data = SPI_NBITS_QUAD;
+ break;
+
+ case SPI_PROTO_1_2_2:
+ code = SPI_NBITS_SINGLE;
+ addr = SPI_NBITS_DUAL;
+ data = SPI_NBITS_DUAL;
+ break;
+
+ case SPI_PROTO_1_4_4:
+ code = SPI_NBITS_SINGLE;
+ addr = SPI_NBITS_QUAD;
+ data = SPI_NBITS_QUAD;
+ break;
+
+ case SPI_PROTO_2_2_2:
+ code = SPI_NBITS_DUAL;
+ addr = SPI_NBITS_DUAL;
+ data = SPI_NBITS_DUAL;
+ break;
+
+ case SPI_PROTO_4_4_4:
+ code = SPI_NBITS_QUAD;
+ addr = SPI_NBITS_QUAD;
+ data = SPI_NBITS_QUAD;
+ break;
+
+ default:
+ return -EINVAL;
+
+ }
+
+ if (code_nbits)
+ *code_nbits = code;
+ if (addr_nbits)
+ *addr_nbits = addr;
+ if (data_nbits)
+ *data_nbits = data;
+
+ return 0;
+}
+
static int m25p80_read_reg(struct spi_nor *nor, u8 code, u8 *val, int len)
{
struct m25p *flash = nor->priv;
struct spi_device *spi = flash->spi;
+ unsigned code_nbits, data_nbits;
+ struct spi_transfer xfers[2];
int ret;
- ret = spi_write_then_read(spi, &code, 1, val, len);
+ /* Get transfer protocols (addr_nbits is not relevant here). */
+ ret = m25p80_proto2nbits(nor->reg_proto,
+ &code_nbits, NULL, &data_nbits);
+ if (ret < 0)
+ return ret;
+
+ /* Set up transfers. */
+ memset(xfers, 0, sizeof(xfers));
+
+ flash->command[0] = code;
+ xfers[0].len = 1;
+ xfers[0].tx_buf = flash->command;
+ xfers[0].tx_nbits = code_nbits;
+
+ xfers[1].len = len;
+ xfers[1].rx_buf = &flash->command[1];
+ xfers[1].rx_nbits = data_nbits;
+
+ /* Process command. */
+ ret = spi_sync_transfer(spi, xfers, 2);
if (ret < 0)
dev_err(&spi->dev, "error %d reading %x\n", ret, code);
+ else
+ memcpy(val, &flash->command[1], len);
return ret;
}
@@ -65,12 +153,38 @@ static int m25p80_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
{
struct m25p *flash = nor->priv;
struct spi_device *spi = flash->spi;
+ unsigned code_nbits, data_nbits, num_xfers = 1;
+ struct spi_transfer xfers[2];
+ int ret;
+
+ /* Get transfer protocols (addr_nbits is not relevant here). */
+ ret = m25p80_proto2nbits(nor->reg_proto,
+ &code_nbits, NULL, &data_nbits);
+ if (ret < 0)
+ return ret;
+
+ /* Set up transfer(s). */
+ memset(xfers, 0, sizeof(xfers));
flash->command[0] = opcode;
- if (buf)
+ xfers[0].len = 1;
+ xfers[0].tx_buf = flash->command;
+ xfers[0].tx_nbits = code_nbits;
+
+ if (buf) {
memcpy(&flash->command[1], buf, len);
+ if (data_nbits == code_nbits) {
+ xfers[0].len += len;
+ } else {
+ xfers[1].len = len;
+ xfers[1].tx_buf = &flash->command[1];
+ xfers[1].tx_nbits = data_nbits;
+ num_xfers++;
+ }
+ }
- return spi_write(spi, flash->command, len + 1);
+ /* Process command. */
+ return spi_sync_transfer(spi, xfers, num_xfers);
}
static void m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
@@ -78,43 +192,54 @@ static void m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
{
struct m25p *flash = nor->priv;
struct spi_device *spi = flash->spi;
- struct spi_transfer t[2] = {};
+ unsigned code_nbits, addr_nbits, data_nbits, num_xfers = 1;
+ struct spi_transfer xfers[3];
struct spi_message m;
- int cmd_sz = m25p_cmdsz(nor);
-
- spi_message_init(&m);
+ int ret, cmd_sz = m25p_cmdsz(nor);
if (nor->program_opcode == SPINOR_OP_AAI_WP && nor->sst_write_second)
cmd_sz = 1;
- flash->command[0] = nor->program_opcode;
- m25p_addr2cmd(nor, to, flash->command);
+ /* Get transfer protocols. */
+ ret = m25p80_proto2nbits(nor->write_proto,
+ &code_nbits, &addr_nbits, &data_nbits);
+ if (ret < 0) {
+ *retlen = 0;
+ return;
+ }
+
+ /* Set up transfers. */
+ memset(xfers, 0, sizeof(xfers));
- t[0].tx_buf = flash->command;
- t[0].len = cmd_sz;
- spi_message_add_tail(&t[0], &m);
+ flash->command[0] = nor->program_opcode;
+ xfers[0].len = 1;
+ xfers[0].tx_buf = flash->command;
+ xfers[0].tx_nbits = code_nbits;
+
+ if (cmd_sz > 1) {
+ m25p_addr2cmd(nor, to, flash->command);
+ if (addr_nbits == code_nbits) {
+ xfers[0].len += nor->addr_width;
+ } else {
+ xfers[1].len = nor->addr_width;
+ xfers[1].tx_buf = &flash->command[1];
+ xfers[1].tx_nbits = addr_nbits;
+ num_xfers++;
+ }
+ }
- t[1].tx_buf = buf;
- t[1].len = len;
- spi_message_add_tail(&t[1], &m);
+ xfers[num_xfers].len = len;
+ xfers[num_xfers].tx_buf = buf;
+ xfers[num_xfers].tx_nbits = data_nbits;
+ num_xfers++;
+ /* Process command. */
+ spi_message_init_with_transfers(&m, xfers, num_xfers);
spi_sync(spi, &m);
*retlen += m.actual_length - cmd_sz;
}
-static inline unsigned int m25p80_rx_nbits(struct spi_nor *nor)
-{
- switch (nor->flash_read) {
- case SPI_NOR_DUAL:
- return 2;
- case SPI_NOR_QUAD:
- return 4;
- default:
- return 0;
- }
-}
-
/*
* Read an address range from the nor chip. The address range
* may be any size provided it is within the physical boundaries.
@@ -124,28 +249,48 @@ static int m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
{
struct m25p *flash = nor->priv;
struct spi_device *spi = flash->spi;
- struct spi_transfer t[2];
- struct spi_message m;
+ unsigned code_nbits, addr_nbits, data_nbits, num_xfers = 1;
unsigned int dummy = nor->read_dummy;
+ struct spi_transfer xfers[3];
+ struct spi_message m;
+ int ret;
+
+ /* Get transfer protocols. */
+ ret = m25p80_proto2nbits(nor->read_proto,
+ &code_nbits, &addr_nbits, &data_nbits);
+ if (ret < 0) {
+ *retlen = 0;
+ return ret;
+ }
/* convert the dummy cycles to the number of bytes */
dummy /= 8;
- spi_message_init(&m);
- memset(t, 0, (sizeof t));
+ /* Set up transfers. */
+ memset(xfers, 0, sizeof(xfers));
flash->command[0] = nor->read_opcode;
- m25p_addr2cmd(nor, from, flash->command);
+ xfers[0].len = 1;
+ xfers[0].tx_buf = flash->command;
+ xfers[0].tx_nbits = code_nbits;
- t[0].tx_buf = flash->command;
- t[0].len = m25p_cmdsz(nor) + dummy;
- spi_message_add_tail(&t[0], &m);
+ m25p_addr2cmd(nor, from, flash->command);
+ if (addr_nbits == code_nbits) {
+ xfers[0].len += nor->addr_width + dummy;
+ } else {
+ xfers[1].len = nor->addr_width + dummy;
+ xfers[1].tx_buf = &flash->command[1];
+ xfers[1].tx_nbits = addr_nbits;
+ num_xfers++;
+ }
- t[1].rx_buf = buf;
- t[1].rx_nbits = m25p80_rx_nbits(nor);
- t[1].len = len;
- spi_message_add_tail(&t[1], &m);
+ xfers[num_xfers].len = len;
+ xfers[num_xfers].rx_buf = buf;
+ xfers[num_xfers].rx_nbits = data_nbits;
+ num_xfers++;
+ /* Process command. */
+ spi_message_init_with_transfers(&m, xfers, num_xfers);
spi_sync(spi, &m);
*retlen = m.actual_length - m25p_cmdsz(nor) - dummy;
@@ -155,15 +300,40 @@ static int m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
static int m25p80_erase(struct spi_nor *nor, loff_t offset)
{
struct m25p *flash = nor->priv;
+ struct spi_device *spi = flash->spi;
+ unsigned code_nbits, addr_nbits, num_xfers = 1;
+ struct spi_transfer xfers[2];
+ int ret;
dev_dbg(nor->dev, "%dKiB at 0x%08x\n",
flash->spi_nor.mtd.erasesize / 1024, (u32)offset);
- /* Set up command buffer. */
+ /* Get transfer protocols (data_nbits is not relevant here). */
+ ret = m25p80_proto2nbits(nor->erase_proto,
+ &code_nbits, &addr_nbits, NULL);
+ if (ret < 0)
+ return ret;
+
+ /* Set up transfers. */
+ memset(xfers, 0, sizeof(xfers));
+
flash->command[0] = nor->erase_opcode;
+ xfers[0].len = 1;
+ xfers[0].tx_buf = flash->command;
+ xfers[0].tx_nbits = code_nbits;
+
m25p_addr2cmd(nor, offset, flash->command);
+ if (code_nbits == addr_nbits) {
+ xfers[0].len += nor->addr_width;
+ } else {
+ xfers[1].len = nor->addr_width;
+ xfers[1].tx_buf = &flash->command[1];
+ xfers[1].tx_nbits = addr_nbits;
+ num_xfers++;
+ }
- spi_write(flash->spi, flash->command, m25p_cmdsz(nor));
+ /* Process command. */
+ spi_sync_transfer(spi, xfers, num_xfers);
return 0;
}
--
1.8.2.2
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