| /* |
| * MTD SPI driver for ST M25Pxx (and similar) serial flash chips |
| * |
| * Author: Mike Lavender, mike@steroidmicros.com |
| * |
| * Copyright (c) 2005, Intec Automation Inc. |
| * |
| * Some parts are based on lart.c by Abraham Van Der Merwe |
| * |
| * Cleaned up and generalized based on mtd_dataflash.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/interrupt.h> |
| #include <linux/mutex.h> |
| #include <linux/math64.h> |
| #include <linux/sched.h> |
| #include <linux/mod_devicetable.h> |
| |
| #include <linux/mtd/mtd.h> |
| #include <linux/mtd/partitions.h> |
| |
| #include <linux/spi/spi.h> |
| #include <linux/spi/flash.h> |
| |
| /* Flash opcodes. */ |
| #define OPCODE_WREN 0x06 /* Write enable */ |
| #define OPCODE_RDSR 0x05 /* Read status register */ |
| #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_PP 0x02 /* Page program (up to 256 bytes) */ |
| #define OPCODE_BE_4K 0x20 /* Erase 4KiB block */ |
| #define OPCODE_BE_32K 0x52 /* Erase 32KiB block */ |
| #define OPCODE_CHIP_ERASE 0xc7 /* Erase whole flash chip */ |
| #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 */ |
| /* meaning of other SR_* bits may differ between vendors */ |
| #define SR_BP0 4 /* Block protect 0 */ |
| #define SR_BP1 8 /* Block protect 1 */ |
| #define SR_BP2 0x10 /* Block protect 2 */ |
| #define SR_SRWD 0x80 /* SR write protect */ |
| |
| /* 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 4 |
| |
| #ifdef CONFIG_M25PXX_USE_FAST_READ |
| #define OPCODE_READ OPCODE_FAST_READ |
| #define FAST_READ_DUMMY_BYTE 1 |
| #else |
| #define OPCODE_READ OPCODE_NORM_READ |
| #define FAST_READ_DUMMY_BYTE 0 |
| #endif |
| |
| /****************************************************************************/ |
| |
| struct m25p { |
| struct spi_device *spi; |
| struct mutex lock; |
| struct mtd_info mtd; |
| unsigned partitioned:1; |
| u16 page_size; |
| u16 addr_width; |
| u8 erase_opcode; |
| u8 *command; |
| }; |
| |
| static inline struct m25p *mtd_to_m25p(struct mtd_info *mtd) |
| { |
| return container_of(mtd, struct m25p, mtd); |
| } |
| |
| /****************************************************************************/ |
| |
| /* |
| * Internal helper functions |
| */ |
| |
| /* |
| * Read the status register, returning its value in the location |
| * Return the status register value. |
| * Returns negative if error occurred. |
| */ |
| static int read_sr(struct m25p *flash) |
| { |
| ssize_t retval; |
| u8 code = OPCODE_RDSR; |
| u8 val; |
| |
| retval = spi_write_then_read(flash->spi, &code, 1, &val, 1); |
| |
| if (retval < 0) { |
| dev_err(&flash->spi->dev, "error %d reading SR\n", |
| (int) retval); |
| return retval; |
| } |
| |
| return val; |
| } |
| |
| /* |
| * Write status register 1 byte |
| * Returns negative if error occurred. |
| */ |
| static int write_sr(struct m25p *flash, u8 val) |
| { |
| flash->command[0] = OPCODE_WRSR; |
| flash->command[1] = val; |
| |
| return spi_write(flash->spi, flash->command, 2); |
| } |
| |
| /* |
| * Set write enable latch with Write Enable command. |
| * Returns negative if error occurred. |
| */ |
| static inline int write_enable(struct m25p *flash) |
| { |
| u8 code = OPCODE_WREN; |
| |
| 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. |
| * Returns non-zero if error. |
| */ |
| static int wait_till_ready(struct m25p *flash) |
| { |
| unsigned long deadline; |
| int sr; |
| |
| deadline = jiffies + MAX_READY_WAIT_JIFFIES; |
| |
| do { |
| if ((sr = read_sr(flash)) < 0) |
| break; |
| else if (!(sr & SR_WIP)) |
| return 0; |
| |
| cond_resched(); |
| |
| } while (!time_after_eq(jiffies, deadline)); |
| |
| return 1; |
| } |
| |
| /* |
| * Erase the whole flash memory |
| * |
| * Returns 0 if successful, non-zero otherwise. |
| */ |
| static int erase_chip(struct m25p *flash) |
| { |
| DEBUG(MTD_DEBUG_LEVEL3, "%s: %s %lldKiB\n", |
| dev_name(&flash->spi->dev), __func__, |
| (long long)(flash->mtd.size >> 10)); |
| |
| /* Wait until finished previous write command. */ |
| if (wait_till_ready(flash)) |
| return 1; |
| |
| /* Send write enable, then erase commands. */ |
| write_enable(flash); |
| |
| /* Set up command buffer. */ |
| flash->command[0] = OPCODE_CHIP_ERASE; |
| |
| spi_write(flash->spi, flash->command, 1); |
| |
| 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. |
| * |
| * Returns 0 if successful, non-zero otherwise. |
| */ |
| static int erase_sector(struct m25p *flash, u32 offset) |
| { |
| DEBUG(MTD_DEBUG_LEVEL3, "%s: %s %dKiB at 0x%08x\n", |
| dev_name(&flash->spi->dev), __func__, |
| flash->mtd.erasesize / 1024, offset); |
| |
| /* Wait until finished previous write command. */ |
| if (wait_till_ready(flash)) |
| return 1; |
| |
| /* Send write enable, then erase commands. */ |
| write_enable(flash); |
| |
| /* Set up command buffer. */ |
| flash->command[0] = flash->erase_opcode; |
| m25p_addr2cmd(flash, offset, flash->command); |
| |
| spi_write(flash->spi, flash->command, m25p_cmdsz(flash)); |
| |
| return 0; |
| } |
| |
| /****************************************************************************/ |
| |
| /* |
| * MTD implementation |
| */ |
| |
| /* |
| * Erase an address range on the flash chip. The address range may extend |
| * one or more erase sectors. Return an error is there is a problem erasing. |
| */ |
| static int m25p80_erase(struct mtd_info *mtd, struct erase_info *instr) |
| { |
| struct m25p *flash = mtd_to_m25p(mtd); |
| u32 addr,len; |
| uint32_t rem; |
| |
| DEBUG(MTD_DEBUG_LEVEL2, "%s: %s %s 0x%llx, len %lld\n", |
| dev_name(&flash->spi->dev), __func__, "at", |
| (long long)instr->addr, (long long)instr->len); |
| |
| /* sanity checks */ |
| if (instr->addr + instr->len > flash->mtd.size) |
| return -EINVAL; |
| div_u64_rem(instr->len, mtd->erasesize, &rem); |
| if (rem) |
| return -EINVAL; |
| |
| addr = instr->addr; |
| len = instr->len; |
| |
| mutex_lock(&flash->lock); |
| |
| /* whole-chip erase? */ |
| if (len == flash->mtd.size) { |
| if (erase_chip(flash)) { |
| instr->state = MTD_ERASE_FAILED; |
| mutex_unlock(&flash->lock); |
| return -EIO; |
| } |
| |
| /* REVISIT in some cases we could speed up erasing large regions |
| * by using OPCODE_SE instead of OPCODE_BE_4K. We may have set up |
| * to use "small sector erase", but that's not always optimal. |
| */ |
| |
| /* "sector"-at-a-time erase */ |
| } else { |
| while (len) { |
| if (erase_sector(flash, addr)) { |
| instr->state = MTD_ERASE_FAILED; |
| mutex_unlock(&flash->lock); |
| return -EIO; |
| } |
| |
| addr += mtd->erasesize; |
| len -= mtd->erasesize; |
| } |
| } |
| |
| mutex_unlock(&flash->lock); |
| |
| instr->state = MTD_ERASE_DONE; |
| mtd_erase_callback(instr); |
| |
| return 0; |
| } |
| |
| /* |
| * Read an address range from the flash chip. The address range |
| * may be any size provided it is within the physical boundaries. |
| */ |
| static int m25p80_read(struct mtd_info *mtd, loff_t from, size_t len, |
| size_t *retlen, u_char *buf) |
| { |
| struct m25p *flash = mtd_to_m25p(mtd); |
| struct spi_transfer t[2]; |
| struct spi_message m; |
| |
| DEBUG(MTD_DEBUG_LEVEL2, "%s: %s %s 0x%08x, len %zd\n", |
| dev_name(&flash->spi->dev), __func__, "from", |
| (u32)from, len); |
| |
| /* sanity checks */ |
| if (!len) |
| return 0; |
| |
| if (from + len > flash->mtd.size) |
| return -EINVAL; |
| |
| spi_message_init(&m); |
| memset(t, 0, (sizeof t)); |
| |
| /* NOTE: |
| * OPCODE_FAST_READ (if available) is faster. |
| * Should add 1 byte DUMMY_BYTE. |
| */ |
| t[0].tx_buf = flash->command; |
| t[0].len = m25p_cmdsz(flash) + FAST_READ_DUMMY_BYTE; |
| spi_message_add_tail(&t[0], &m); |
| |
| t[1].rx_buf = buf; |
| t[1].len = len; |
| spi_message_add_tail(&t[1], &m); |
| |
| /* Byte count starts at zero. */ |
| if (retlen) |
| *retlen = 0; |
| |
| mutex_lock(&flash->lock); |
| |
| /* Wait till previous write/erase is done. */ |
| if (wait_till_ready(flash)) { |
| /* REVISIT status return?? */ |
| mutex_unlock(&flash->lock); |
| return 1; |
| } |
| |
| /* FIXME switch to OPCODE_FAST_READ. It's required for higher |
| * clocks; and at this writing, every chip this driver handles |
| * supports that opcode. |
| */ |
| |
| /* Set up the write data buffer. */ |
| flash->command[0] = OPCODE_READ; |
| m25p_addr2cmd(flash, from, flash->command); |
| |
| spi_sync(flash->spi, &m); |
| |
| *retlen = m.actual_length - m25p_cmdsz(flash) - FAST_READ_DUMMY_BYTE; |
| |
| mutex_unlock(&flash->lock); |
| |
| return 0; |
| } |
| |
| /* |
| * Write an address range to the flash chip. Data must be written in |
| * FLASH_PAGESIZE chunks. The address range may be any size provided |
| * it is within the physical boundaries. |
| */ |
| static int m25p80_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); |
| u32 page_offset, page_size; |
| struct spi_transfer t[2]; |
| struct spi_message m; |
| |
| DEBUG(MTD_DEBUG_LEVEL2, "%s: %s %s 0x%08x, len %zd\n", |
| dev_name(&flash->spi->dev), __func__, "to", |
| (u32)to, len); |
| |
| 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 = m25p_cmdsz(flash); |
| 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. */ |
| if (wait_till_ready(flash)) { |
| mutex_unlock(&flash->lock); |
| return 1; |
| } |
| |
| write_enable(flash); |
| |
| /* Set up the opcode in the write buffer. */ |
| flash->command[0] = OPCODE_PP; |
| m25p_addr2cmd(flash, to, flash->command); |
| |
| page_offset = to & (flash->page_size - 1); |
| |
| /* do all the bytes fit onto one page? */ |
| if (page_offset + len <= flash->page_size) { |
| t[1].len = len; |
| |
| spi_sync(flash->spi, &m); |
| |
| *retlen = m.actual_length - m25p_cmdsz(flash); |
| } else { |
| u32 i; |
| |
| /* the size of data remaining on the first page */ |
| page_size = flash->page_size - page_offset; |
| |
| t[1].len = page_size; |
| spi_sync(flash->spi, &m); |
| |
| *retlen = m.actual_length - m25p_cmdsz(flash); |
| |
| /* write everything in flash->page_size chunks */ |
| for (i = page_size; i < len; i += page_size) { |
| page_size = len - i; |
| if (page_size > flash->page_size) |
| page_size = flash->page_size; |
| |
| /* write the next page to flash */ |
| m25p_addr2cmd(flash, to + i, flash->command); |
| |
| t[1].tx_buf = buf + i; |
| t[1].len = page_size; |
| |
| wait_till_ready(flash); |
| |
| write_enable(flash); |
| |
| spi_sync(flash->spi, &m); |
| |
| if (retlen) |
| *retlen += m.actual_length - m25p_cmdsz(flash); |
| } |
| } |
| |
| mutex_unlock(&flash->lock); |
| |
| 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 = m25p_cmdsz(flash); |
| 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; |
| m25p_addr2cmd(flash, to, flash->command); |
| |
| /* 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 - m25p_cmdsz(flash); |
| } |
| to += actual; |
| |
| flash->command[0] = OPCODE_AAI_WP; |
| m25p_addr2cmd(flash, to, flash->command); |
| |
| /* Write out most of the data here. */ |
| cmd_sz = m25p_cmdsz(flash); |
| 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; |
| m25p_addr2cmd(flash, to, flash->command); |
| t[0].len = m25p_cmdsz(flash); |
| 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 - m25p_cmdsz(flash); |
| write_disable(flash); |
| } |
| |
| time_out: |
| mutex_unlock(&flash->lock); |
| return ret; |
| } |
| |
| /****************************************************************************/ |
| |
| /* |
| * SPI device driver setup and teardown |
| */ |
| |
| struct flash_info { |
| /* JEDEC id zero means "no ID" (most older chips); otherwise it has |
| * a high byte of zero plus three data bytes: the manufacturer id, |
| * then a two byte device id. |
| */ |
| u32 jedec_id; |
| u16 ext_id; |
| |
| /* The size listed here is what works with OPCODE_SE, which isn't |
| * necessarily called a "sector" by the vendor. |
| */ |
| 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) \ |
| ((kernel_ulong_t)&(struct flash_info) { \ |
| .jedec_id = (_jedec_id), \ |
| .ext_id = (_ext_id), \ |
| .sector_size = (_sector_size), \ |
| .n_sectors = (_n_sectors), \ |
| .page_size = 256, \ |
| .addr_width = 3, \ |
| .flags = (_flags), \ |
| }) |
| |
| #define CAT25_INFO(_sector_size, _n_sectors, _page_size, _addr_width) \ |
| ((kernel_ulong_t)&(struct flash_info) { \ |
| .sector_size = (_sector_size), \ |
| .n_sectors = (_n_sectors), \ |
| .page_size = (_page_size), \ |
| .addr_width = (_addr_width), \ |
| .flags = M25P_NO_ERASE, \ |
| }) |
| |
| /* NOTE: double check command sets and memory organization when you add |
| * more flash chips. This current list focusses on newer chips, which |
| * have been converging on command sets which including JEDEC ID. |
| */ |
| 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) }, |
| |
| { "at25df041a", INFO(0x1f4401, 0, 64 * 1024, 8, SECT_4K) }, |
| { "at25df641", INFO(0x1f4800, 0, 64 * 1024, 128, 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) }, |
| |
| /* Macronix */ |
| { "mx25l4005a", INFO(0xc22013, 0, 64 * 1024, 8, SECT_4K) }, |
| { "mx25l3205d", INFO(0xc22016, 0, 64 * 1024, 64, 0) }, |
| { "mx25l6405d", INFO(0xc22017, 0, 64 * 1024, 128, 0) }, |
| { "mx25l12805d", INFO(0xc22018, 0, 64 * 1024, 256, 0) }, |
| { "mx25l12855e", INFO(0xc22618, 0, 64 * 1024, 256, 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) }, |
| { "s25fl129p0", INFO(0x012018, 0x4d00, 256 * 1024, 64, 0) }, |
| { "s25fl129p1", INFO(0x012018, 0x4d01, 64 * 1024, 256, 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) }, |
| { "sst25wf512", INFO(0xbf2501, 0, 64 * 1024, 1, SECT_4K) }, |
| { "sst25wf010", INFO(0xbf2502, 0, 64 * 1024, 2, SECT_4K) }, |
| { "sst25wf020", INFO(0xbf2503, 0, 64 * 1024, 4, SECT_4K) }, |
| { "sst25wf040", INFO(0xbf2504, 0, 64 * 1024, 8, 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) }, |
| |
| /* 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) }, |
| |
| /* Catalyst / On Semiconductor -- non-JEDEC */ |
| { "cat25c11", CAT25_INFO( 16, 8, 16, 1) }, |
| { "cat25c03", CAT25_INFO( 32, 8, 16, 2) }, |
| { "cat25c09", CAT25_INFO( 128, 8, 32, 2) }, |
| { "cat25c17", CAT25_INFO( 256, 8, 32, 2) }, |
| { "cat25128", CAT25_INFO(2048, 8, 64, 2) }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(spi, m25p_ids); |
| |
| static const struct spi_device_id *__devinit jedec_probe(struct spi_device *spi) |
| { |
| int tmp; |
| u8 code = OPCODE_RDID; |
| u8 id[5]; |
| u32 jedec; |
| u16 ext_jedec; |
| struct flash_info *info; |
| |
| /* JEDEC also defines an optional "extended device information" |
| * string for after vendor-specific data, after the three bytes |
| * we use here. Supporting some chips might require using it. |
| */ |
| tmp = spi_write_then_read(spi, &code, 1, id, 5); |
| if (tmp < 0) { |
| DEBUG(MTD_DEBUG_LEVEL0, "%s: error %d reading JEDEC ID\n", |
| dev_name(&spi->dev), tmp); |
| return NULL; |
| } |
| jedec = id[0]; |
| jedec = jedec << 8; |
| jedec |= id[1]; |
| jedec = jedec << 8; |
| jedec |= id[2]; |
| |
| /* |
| * Some chips (like Numonyx M25P80) have JEDEC and non-JEDEC variants, |
| * which depend on technology process. Officially RDID command doesn't |
| * exist for non-JEDEC chips, but for compatibility they return ID 0. |
| */ |
| if (jedec == 0) |
| return NULL; |
| |
| ext_jedec = id[3] << 8 | id[4]; |
| |
| for (tmp = 0; tmp < ARRAY_SIZE(m25p_ids) - 1; tmp++) { |
| info = (void *)m25p_ids[tmp].driver_data; |
| if (info->jedec_id == jedec) { |
| if (info->ext_id != 0 && info->ext_id != ext_jedec) |
| continue; |
| return &m25p_ids[tmp]; |
| } |
| } |
| return NULL; |
| } |
| |
| |
| /* |
| * board specific setup should have ensured the SPI clock used here |
| * matches what the READ command supports, at least until this driver |
| * understands FAST_READ (for clocks over 25 MHz). |
| */ |
| static int __devinit m25p_probe(struct spi_device *spi) |
| { |
| const struct spi_device_id *id = spi_get_device_id(spi); |
| struct flash_platform_data *data; |
| struct m25p *flash; |
| struct flash_info *info; |
| unsigned i; |
| |
| /* Platform data helps sort out which chip type we have, as |
| * well as how this board partitions it. If we don't have |
| * a chip ID, try the JEDEC id commands; they'll work for most |
| * newer chips, even if we don't recognize the particular chip. |
| */ |
| data = spi->dev.platform_data; |
| if (data && data->type) { |
| const struct spi_device_id *plat_id; |
| |
| for (i = 0; i < ARRAY_SIZE(m25p_ids) - 1; i++) { |
| plat_id = &m25p_ids[i]; |
| if (strcmp(data->type, plat_id->name)) |
| continue; |
| break; |
| } |
| |
| if (plat_id) |
| id = plat_id; |
| else |
| dev_warn(&spi->dev, "unrecognized id %s\n", data->type); |
| } |
| |
| info = (void *)id->driver_data; |
| |
| if (info->jedec_id) { |
| const struct spi_device_id *jid; |
| |
| jid = jedec_probe(spi); |
| if (!jid) { |
| dev_info(&spi->dev, "non-JEDEC variant of %s\n", |
| id->name); |
| } else if (jid != id) { |
| /* |
| * JEDEC knows better, so overwrite platform ID. We |
| * can't trust partitions any longer, but we'll let |
| * mtd apply them anyway, since some partitions may be |
| * marked read-only, and we don't want to lose that |
| * information, even if it's not 100% accurate. |
| */ |
| dev_warn(&spi->dev, "found %s, expected %s\n", |
| jid->name, id->name); |
| id = jid; |
| info = (void *)jid->driver_data; |
| } |
| } |
| |
| flash = kzalloc(sizeof *flash, GFP_KERNEL); |
| if (!flash) |
| return -ENOMEM; |
| flash->command = kmalloc(MAX_CMD_SIZE + FAST_READ_DUMMY_BYTE, GFP_KERNEL); |
| if (!flash->command) { |
| kfree(flash); |
| return -ENOMEM; |
| } |
| |
| flash->spi = spi; |
| mutex_init(&flash->lock); |
| dev_set_drvdata(&spi->dev, flash); |
| |
| /* |
| * Atmel and SST serial flash tend to power |
| * up with the software protection bits set |
| */ |
| |
| if (info->jedec_id >> 16 == 0x1f || |
| info->jedec_id >> 16 == 0xbf) { |
| write_enable(flash); |
| write_sr(flash, 0); |
| } |
| |
| if (data && data->name) |
| flash->mtd.name = data->name; |
| else |
| flash->mtd.name = dev_name(&spi->dev); |
| |
| flash->mtd.type = MTD_NORFLASH; |
| flash->mtd.writesize = 1; |
| flash->mtd.flags = MTD_CAP_NORFLASH; |
| flash->mtd.size = info->sector_size * info->n_sectors; |
| flash->mtd.erase = m25p80_erase; |
| flash->mtd.read = m25p80_read; |
| |
| /* 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) { |
| flash->erase_opcode = OPCODE_BE_4K; |
| flash->mtd.erasesize = 4096; |
| } else { |
| flash->erase_opcode = OPCODE_SE; |
| 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); |
| |
| 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); |
| |
| |
| /* partitions should match sector boundaries; and it may be good to |
| * use readonly partitions for writeprotected sectors (BP2..BP0). |
| */ |
| 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 && data->nr_parts) |
| dev_warn(&spi->dev, "ignoring %d default partitions on %s\n", |
| data->nr_parts, data->name); |
| |
| return add_mtd_device(&flash->mtd) == 1 ? -ENODEV : 0; |
| } |
| |
| |
| static int __devexit m25p_remove(struct spi_device *spi) |
| { |
| struct m25p *flash = dev_get_drvdata(&spi->dev); |
| int status; |
| |
| /* Clean up MTD stuff. */ |
| if (mtd_has_partitions() && flash->partitioned) |
| status = del_mtd_partitions(&flash->mtd); |
| else |
| status = del_mtd_device(&flash->mtd); |
| if (status == 0) { |
| kfree(flash->command); |
| kfree(flash); |
| } |
| return 0; |
| } |
| |
| |
| static struct spi_driver m25p80_driver = { |
| .driver = { |
| .name = "m25p80", |
| .bus = &spi_bus_type, |
| .owner = THIS_MODULE, |
| }, |
| .id_table = m25p_ids, |
| .probe = m25p_probe, |
| .remove = __devexit_p(m25p_remove), |
| |
| /* REVISIT: many of these chips have deep power-down modes, which |
| * should clearly be entered on suspend() to minimize power use. |
| * And also when they're otherwise idle... |
| */ |
| }; |
| |
| |
| static int __init m25p80_init(void) |
| { |
| return spi_register_driver(&m25p80_driver); |
| } |
| |
| |
| static void __exit m25p80_exit(void) |
| { |
| spi_unregister_driver(&m25p80_driver); |
| } |
| |
| |
| module_init(m25p80_init); |
| module_exit(m25p80_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Mike Lavender"); |
| MODULE_DESCRIPTION("MTD SPI driver for ST M25Pxx flash chips"); |