[PATCH 2/2] mtd: m25p80: Add support for CAT25xxx serial EEPROMs
From: Anton Vorontsov
Date: Tue Aug 18 2009 - 17:46:38 EST
CAT25 chips (as manufactured by On Semiconductor, previously Catalyst
Semiconductor) are similar to the original M25Px0 chips, except:
- Address width can vary (1-2 bytes, in contrast to 3 bytes in M25P
chips). So, implement convenient m25p_addr2cmd() and m25p_cmdsz()
calls, and place address width information into flash_info struct;
- Page size can vary, therefore we shouldn't hardcode it, so get rid
of FLASH_PAGESIZE definition, and place the page size information
into flash_info struct;
- CAT25 EEPROMs don't need to be erased, so add NO_ERASE flag, and
propagate it to the mtd subsystem.
Signed-off-by: Anton Vorontsov <avorontsov@xxxxxxxxxxxxx>
---
drivers/mtd/devices/m25p80.c | 172 ++++++++++++++++++++++++------------------
1 files changed, 97 insertions(+), 75 deletions(-)
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index b75e319..8930266 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -29,9 +29,6 @@
#include <linux/spi/spi.h>
#include <linux/spi/flash.h>
-
-#define FLASH_PAGESIZE 256
-
/* Flash opcodes. */
#define OPCODE_WREN 0x06 /* Write enable */
#define OPCODE_RDSR 0x05 /* Read status register */
@@ -56,7 +53,7 @@
/* 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 CMD_SIZE 4
+#define MAX_CMD_SIZE 4
#ifdef CONFIG_M25PXX_USE_FAST_READ
#define OPCODE_READ OPCODE_FAST_READ
@@ -73,8 +70,10 @@ struct m25p {
struct mutex lock;
struct mtd_info mtd;
unsigned partitioned:1;
+ u16 page_size;
+ u16 addr_width;
u8 erase_opcode;
- u8 command[CMD_SIZE + FAST_READ_DUMMY_BYTE];
+ u8 command[MAX_CMD_SIZE + FAST_READ_DUMMY_BYTE];
};
static inline struct m25p *mtd_to_m25p(struct mtd_info *mtd)
@@ -184,6 +183,19 @@ static int erase_chip(struct m25p *flash)
return 0;
}
+static void m25p_addr2cmd(struct m25p *flash, unsigned int addr, u8 *cmd)
+{
+ /* opcode is in cmd[0] */
+ cmd[1] = addr >> (flash->addr_width * 8 - 8);
+ cmd[2] = addr >> (flash->addr_width * 8 - 16);
+ cmd[3] = addr >> (flash->addr_width * 8 - 24);
+}
+
+static int m25p_cmdsz(struct m25p *flash)
+{
+ return 1 + flash->addr_width;
+}
+
/*
* Erase one sector of flash memory at offset ``offset'' which is any
* address within the sector which should be erased.
@@ -205,11 +217,9 @@ static int erase_sector(struct m25p *flash, u32 offset)
/* Set up command buffer. */
flash->command[0] = flash->erase_opcode;
- flash->command[1] = offset >> 16;
- flash->command[2] = offset >> 8;
- flash->command[3] = offset;
+ m25p_addr2cmd(flash, offset, flash->command);
- spi_write(flash->spi, flash->command, CMD_SIZE);
+ spi_write(flash->spi, flash->command, m25p_cmdsz(flash));
return 0;
}
@@ -311,7 +321,7 @@ static int m25p80_read(struct mtd_info *mtd, loff_t from, size_t len,
* Should add 1 byte DUMMY_BYTE.
*/
t[0].tx_buf = flash->command;
- t[0].len = CMD_SIZE + FAST_READ_DUMMY_BYTE;
+ t[0].len = m25p_cmdsz(flash) + FAST_READ_DUMMY_BYTE;
spi_message_add_tail(&t[0], &m);
t[1].rx_buf = buf;
@@ -338,13 +348,11 @@ static int m25p80_read(struct mtd_info *mtd, loff_t from, size_t len,
/* Set up the write data buffer. */
flash->command[0] = OPCODE_READ;
- flash->command[1] = from >> 16;
- flash->command[2] = from >> 8;
- flash->command[3] = from;
+ m25p_addr2cmd(flash, from, flash->command);
spi_sync(flash->spi, &m);
- *retlen = m.actual_length - CMD_SIZE - FAST_READ_DUMMY_BYTE;
+ *retlen = m.actual_length - m25p_cmdsz(flash) - FAST_READ_DUMMY_BYTE;
mutex_unlock(&flash->lock);
@@ -382,7 +390,7 @@ static int m25p80_write(struct mtd_info *mtd, loff_t to, size_t len,
memset(t, 0, (sizeof t));
t[0].tx_buf = flash->command;
- t[0].len = CMD_SIZE;
+ t[0].len = m25p_cmdsz(flash);
spi_message_add_tail(&t[0], &m);
t[1].tx_buf = buf;
@@ -400,41 +408,36 @@ static int m25p80_write(struct mtd_info *mtd, loff_t to, size_t len,
/* Set up the opcode in the write buffer. */
flash->command[0] = OPCODE_PP;
- flash->command[1] = to >> 16;
- flash->command[2] = to >> 8;
- flash->command[3] = to;
+ m25p_addr2cmd(flash, to, flash->command);
- /* what page do we start with? */
- page_offset = to % FLASH_PAGESIZE;
+ page_offset = to & (flash->page_size - 1);
/* do all the bytes fit onto one page? */
- if (page_offset + len <= FLASH_PAGESIZE) {
+ if (page_offset + len <= flash->page_size) {
t[1].len = len;
spi_sync(flash->spi, &m);
- *retlen = m.actual_length - CMD_SIZE;
+ *retlen = m.actual_length - m25p_cmdsz(flash);
} else {
u32 i;
/* the size of data remaining on the first page */
- page_size = FLASH_PAGESIZE - page_offset;
+ page_size = flash->page_size - page_offset;
t[1].len = page_size;
spi_sync(flash->spi, &m);
- *retlen = m.actual_length - CMD_SIZE;
+ *retlen = m.actual_length - m25p_cmdsz(flash);
- /* write everything in PAGESIZE chunks */
+ /* write everything in flash->page_size chunks */
for (i = page_size; i < len; i += page_size) {
page_size = len - i;
- if (page_size > FLASH_PAGESIZE)
- page_size = FLASH_PAGESIZE;
+ if (page_size > flash->page_size)
+ page_size = flash->page_size;
/* write the next page to flash */
- flash->command[1] = (to + i) >> 16;
- flash->command[2] = (to + i) >> 8;
- flash->command[3] = (to + i);
+ m25p_addr2cmd(flash, to + i, flash->command);
t[1].tx_buf = buf + i;
t[1].len = page_size;
@@ -446,7 +449,7 @@ static int m25p80_write(struct mtd_info *mtd, loff_t to, size_t len,
spi_sync(flash->spi, &m);
if (retlen)
- *retlen += m.actual_length - CMD_SIZE;
+ *retlen += m.actual_length - m25p_cmdsz(flash);
}
}
@@ -476,16 +479,23 @@ struct flash_info {
unsigned sector_size;
u16 n_sectors;
+ u16 page_size;
+ u16 addr_width;
+
u16 flags;
#define SECT_4K 0x01 /* OPCODE_BE_4K works uniformly */
+#define M25P_NO_ERASE 0x02 /* No erase command needed */
};
-#define INFO(_jedec_id, _ext_id, _sector_size, _n_sectors, _flags) \
+#define INFO(_jedec_id, _ext_id, _sector_size, _n_sectors, _page_size, \
+ _addr_width, _flags) \
((kernel_ulong_t)&(struct flash_info) { \
.jedec_id = (_jedec_id), \
.ext_id = (_ext_id), \
.sector_size = (_sector_size), \
.n_sectors = (_n_sectors), \
+ .page_size = (_page_size), \
+ .addr_width = (_addr_width), \
.flags = (_flags), \
})
@@ -495,63 +505,70 @@ struct flash_info {
*/
static const struct spi_device_id m25p_ids[] = {
/* Atmel -- some are (confusingly) marketed as "DataFlash" */
- { "at25fs010", INFO(0x1f6601, 0, 32 * 1024, 4, SECT_4K) },
- { "at25fs040", INFO(0x1f6604, 0, 64 * 1024, 8, SECT_4K) },
+ { "at25fs010", INFO(0x1f6601, 0, 32 * 1024, 4, 256, 3, SECT_4K) },
+ { "at25fs040", INFO(0x1f6604, 0, 64 * 1024, 8, 256, 3, SECT_4K) },
- { "at25df041a", INFO(0x1f4401, 0, 64 * 1024, 8, SECT_4K) },
- { "at25df641", INFO(0x1f4800, 0, 64 * 1024, 128, SECT_4K) },
+ { "at25df041a", INFO(0x1f4401, 0, 64 * 1024, 8, 256, 3, SECT_4K) },
+ { "at25df641", INFO(0x1f4800, 0, 64 * 1024, 128, 256, 3, SECT_4K) },
- { "at26f004", INFO(0x1f0400, 0, 64 * 1024, 8, SECT_4K) },
- { "at26df081a", INFO(0x1f4501, 0, 64 * 1024, 16, SECT_4K) },
- { "at26df161a", INFO(0x1f4601, 0, 64 * 1024, 32, SECT_4K) },
- { "at26df321", INFO(0x1f4701, 0, 64 * 1024, 64, SECT_4K) },
+ { "at26f004", INFO(0x1f0400, 0, 64 * 1024, 8, 256, 3, SECT_4K) },
+ { "at26df081a", INFO(0x1f4501, 0, 64 * 1024, 16, 256, 3, SECT_4K) },
+ { "at26df161a", INFO(0x1f4601, 0, 64 * 1024, 32, 256, 3, SECT_4K) },
+ { "at26df321", INFO(0x1f4701, 0, 64 * 1024, 64, 256, 3, SECT_4K) },
/* Macronix */
- { "mx25l12805d", INFO(0xc22018, 0, 64 * 1024, 256, 0) },
+ { "mx25l12805d", INFO(0xc22018, 0, 64 * 1024, 256, 256, 3, 0) },
/* Spansion -- single (large) sector size only, at least
* for the chips listed here (without boot sectors).
*/
- { "s25sl004a", INFO(0x010212, 0, 64 * 1024, 8, 0) },
- { "s25sl008a", INFO(0x010213, 0, 64 * 1024, 16, 0) },
- { "s25sl016a", INFO(0x010214, 0, 64 * 1024, 32, 0) },
- { "s25sl032a", INFO(0x010215, 0, 64 * 1024, 64, 0) },
- { "s25sl064a", INFO(0x010216, 0, 64 * 1024, 128, 0) },
- { "s25sl12800", INFO(0x012018, 0x0300, 256 * 1024, 64, 0) },
- { "s25sl12801", INFO(0x012018, 0x0301, 64 * 1024, 256, 0) },
+ { "s25sl004a", INFO(0x010212, 0, 64 * 1024, 8, 256, 3, 0) },
+ { "s25sl008a", INFO(0x010213, 0, 64 * 1024, 16, 256, 3, 0) },
+ { "s25sl016a", INFO(0x010214, 0, 64 * 1024, 32, 256, 3, 0) },
+ { "s25sl032a", INFO(0x010215, 0, 64 * 1024, 64, 256, 3, 0) },
+ { "s25sl064a", INFO(0x010216, 0, 64 * 1024, 128, 256, 3, 0) },
+ { "s25sl12800", INFO(0x012018, 0x0300, 256 * 1024, 64, 256, 3, 0) },
+ { "s25sl12801", INFO(0x012018, 0x0301, 64 * 1024, 256, 256, 3, 0) },
/* SST -- large erase sizes are "overlays", "sectors" are 4K */
- { "sst25vf040b", INFO(0xbf258d, 0, 64 * 1024, 8, SECT_4K) },
- { "sst25vf080b", INFO(0xbf258e, 0, 64 * 1024, 16, SECT_4K) },
- { "sst25vf016b", INFO(0xbf2541, 0, 64 * 1024, 32, SECT_4K) },
- { "sst25vf032b", INFO(0xbf254a, 0, 64 * 1024, 64, SECT_4K) },
+ { "sst25vf040b", INFO(0xbf258d, 0, 64 * 1024, 8, 256, 3, SECT_4K) },
+ { "sst25vf080b", INFO(0xbf258e, 0, 64 * 1024, 16, 256, 3, SECT_4K) },
+ { "sst25vf016b", INFO(0xbf2541, 0, 64 * 1024, 32, 256, 3, SECT_4K) },
+ { "sst25vf032b", INFO(0xbf254a, 0, 64 * 1024, 64, 256, 3, SECT_4K) },
/* ST Microelectronics -- newer production may have feature updates */
- { "m25p05", INFO(0x202010, 0, 32 * 1024, 2, 0) },
- { "m25p10", INFO(0x202011, 0, 32 * 1024, 4, 0) },
- { "m25p20", INFO(0x202012, 0, 64 * 1024, 4, 0) },
- { "m25p40", INFO(0x202013, 0, 64 * 1024, 8, 0) },
- { "m25p80", INFO(0x202014, 0, 64 * 1024, 16, 0) },
- { "m25p16", INFO(0x202015, 0, 64 * 1024, 32, 0) },
- { "m25p32", INFO(0x202016, 0, 64 * 1024, 64, 0) },
- { "m25p64", INFO(0x202017, 0, 64 * 1024, 128, 0) },
- { "m25p128", INFO(0x202018, 0, 256 * 1024, 64, 0) },
-
- { "m45pe10", INFO(0x204011, 0, 64 * 1024, 2, 0) },
- { "m45pe80", INFO(0x204014, 0, 64 * 1024, 16, 0) },
- { "m45pe16", INFO(0x204015, 0, 64 * 1024, 32, 0) },
-
- { "m25pe80", INFO(0x208014, 0, 64 * 1024, 16, 0) },
- { "m25pe16", INFO(0x208015, 0, 64 * 1024, 32, SECT_4K) },
+ { "m25p05", INFO(0x202010, 0, 32 * 1024, 2, 256, 3, 0) },
+ { "m25p10", INFO(0x202011, 0, 32 * 1024, 4, 256, 3, 0) },
+ { "m25p20", INFO(0x202012, 0, 64 * 1024, 4, 256, 3, 0) },
+ { "m25p40", INFO(0x202013, 0, 64 * 1024, 8, 256, 3, 0) },
+ { "m25p80", INFO(0x202014, 0, 64 * 1024, 16, 256, 3, 0) },
+ { "m25p16", INFO(0x202015, 0, 64 * 1024, 32, 256, 3, 0) },
+ { "m25p32", INFO(0x202016, 0, 64 * 1024, 64, 256, 3, 0) },
+ { "m25p64", INFO(0x202017, 0, 64 * 1024, 128, 256, 3, 0) },
+ { "m25p128", INFO(0x202018, 0, 256 * 1024, 64, 256, 3, 0) },
+
+ { "m45pe10", INFO(0x204011, 0, 64 * 1024, 2, 256, 3, 0) },
+ { "m45pe80", INFO(0x204014, 0, 64 * 1024, 16, 256, 3, 0) },
+ { "m45pe16", INFO(0x204015, 0, 64 * 1024, 32, 256, 3, 0) },
+
+ { "m25pe80", INFO(0x208014, 0, 64 * 1024, 16, 256, 3, 0) },
+ { "m25pe16", INFO(0x208015, 0, 64 * 1024, 32, 256, 3, SECT_4K) },
/* Winbond -- w25x "blocks" are 64K, "sectors" are 4KiB */
- { "w25x10", INFO(0xef3011, 0, 64 * 1024, 2, SECT_4K) },
- { "w25x20", INFO(0xef3012, 0, 64 * 1024, 4, SECT_4K) },
- { "w25x40", INFO(0xef3013, 0, 64 * 1024, 8, SECT_4K) },
- { "w25x80", INFO(0xef3014, 0, 64 * 1024, 16, SECT_4K) },
- { "w25x16", INFO(0xef3015, 0, 64 * 1024, 32, SECT_4K) },
- { "w25x32", INFO(0xef3016, 0, 64 * 1024, 64, SECT_4K) },
- { "w25x64", INFO(0xef3017, 0, 64 * 1024, 128, SECT_4K) },
+ { "w25x10", INFO(0xef3011, 0, 64 * 1024, 2, 256, 3, SECT_4K) },
+ { "w25x20", INFO(0xef3012, 0, 64 * 1024, 4, 256, 3, SECT_4K) },
+ { "w25x40", INFO(0xef3013, 0, 64 * 1024, 8, 256, 3, SECT_4K) },
+ { "w25x80", INFO(0xef3014, 0, 64 * 1024, 16, 256, 3, SECT_4K) },
+ { "w25x16", INFO(0xef3015, 0, 64 * 1024, 32, 256, 3, SECT_4K) },
+ { "w25x32", INFO(0xef3016, 0, 64 * 1024, 64, 256, 3, SECT_4K) },
+ { "w25x64", INFO(0xef3017, 0, 64 * 1024, 128, 256, 3, SECT_4K) },
+
+ /* Catalyst / On Semiconductor -- non-JEDEC */
+ { "cat25c11", INFO(0x0, 0, 16, 8, 16, 1, M25P_NO_ERASE) },
+ { "cat25c03", INFO(0x0, 0, 32, 8, 16, 2, M25P_NO_ERASE) },
+ { "cat25c09", INFO(0x0, 0, 128, 8, 32, 2, M25P_NO_ERASE) },
+ { "cat25c17", INFO(0x0, 0, 256, 8, 32, 2, M25P_NO_ERASE) },
+ { "cat25128", INFO(0x0, 0, 2048, 8, 64, 2, M25P_NO_ERASE) },
{ },
};
MODULE_DEVICE_TABLE(spi, m25p_ids);
@@ -702,7 +719,12 @@ static int __devinit m25p_probe(struct spi_device *spi)
flash->mtd.erasesize = info->sector_size;
}
+ if (info->flags & M25P_NO_ERASE)
+ flash->mtd.flags |= MTD_NO_ERASE;
+
flash->mtd.dev.parent = &spi->dev;
+ flash->page_size = info->page_size;
+ flash->addr_width = info->addr_width;
dev_info(&spi->dev, "%s (%lld Kbytes)\n", id->name,
(long long)flash->mtd.size >> 10);
--
1.6.3.3
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