mtd: m25p80: use the SPI nor framework
Linux-MTD Mailing List
linux-mtd at lists.infradead.org
Tue Jun 10 23:59:03 PDT 2014
Gitweb: http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=03e296f613affcc2671c1e86d8c25ecad867204e
Commit: 03e296f613affcc2671c1e86d8c25ecad867204e
Parent: 1ef391084b22d75110171d34f565f57e4be9b2a6
Author: Brian Norris <computersforpeace at gmail.com>
AuthorDate: Thu Mar 20 05:00:12 2014 -0700
Committer: Brian Norris <computersforpeace at gmail.com>
CommitDate: Mon Apr 14 11:22:58 2014 -0700
mtd: m25p80: use the SPI nor framework
Use the new SPI nor framework, and rewrite the m25p80:
(0) remove all the NOR comands.
(1) change the m25p->command to an array.
(2) implement the necessary hooks, such as m25p80_read/m25p80_write.
Tested with the m25p32.
Signed-off-by: Huang Shijie <b32955 at freescale.com>
Acked-by: Marek Vasut <marex at denx.de>
[Brian: rebased]
Signed-off-by: Brian Norris <computersforpeace at gmail.com>
---
drivers/mtd/devices/Kconfig | 2 +-
drivers/mtd/devices/m25p80.c | 1623 +++++++-----------------------------------
2 files changed, 266 insertions(+), 1359 deletions(-)
diff --git a/drivers/mtd/devices/Kconfig b/drivers/mtd/devices/Kconfig
index 1210bc2..48aa1aa 100644
--- a/drivers/mtd/devices/Kconfig
+++ b/drivers/mtd/devices/Kconfig
@@ -80,7 +80,7 @@ config MTD_DATAFLASH_OTP
config MTD_M25P80
tristate "Support most SPI Flash chips (AT26DF, M25P, W25X, ...)"
- depends on SPI_MASTER
+ depends on SPI_MASTER && MTD_SPI_NOR_BASE
help
This enables access to most modern SPI flash chips, used for
program and data storage. Series supported include Atmel AT26DF,
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
dissimilarity index 92%
index 524dab3..4af6400 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -1,1358 +1,265 @@
-/*
- * MTD SPI driver for ST M25Pxx (and similar) serial flash chips
- *
- * Author: Mike Lavender, mike at 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/err.h>
-#include <linux/errno.h>
-#include <linux/module.h>
-#include <linux/device.h>
-#include <linux/interrupt.h>
-#include <linux/mutex.h>
-#include <linux/math64.h>
-#include <linux/slab.h>
-#include <linux/sched.h>
-#include <linux/mod_devicetable.h>
-
-#include <linux/mtd/cfi.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/partitions.h>
-#include <linux/of_platform.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_DUAL_READ 0x3b /* Read data bytes (Dual SPI) */
-#define OPCODE_QUAD_READ 0x6b /* Read data bytes (Quad SPI) */
-#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 */
-#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 */
-#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_DUAL_READ_4B 0x3c /* Read data bytes (Dual SPI) */
-#define OPCODE_QUAD_READ_4B 0x6c /* Read data bytes (Quad SPI) */
-#define OPCODE_PP_4B 0x12 /* Page program (up to 256 bytes) */
-#define OPCODE_SE_4B 0xdc /* Sector erase (usually 64KiB) */
-
-/* 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 */
-
-/* Used for Macronix and Winbond flashes. */
-#define OPCODE_EN4B 0xb7 /* Enter 4-byte mode */
-#define OPCODE_EX4B 0xe9 /* Exit 4-byte mode */
-
-/* Used for Spansion flashes only. */
-#define OPCODE_BRWR 0x17 /* Bank register write */
-
-/* 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 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
-
-#define JEDEC_MFR(_jedec_id) ((_jedec_id) >> 16)
-
-/****************************************************************************/
-
-enum read_type {
- M25P80_NORMAL = 0,
- M25P80_FAST,
- M25P80_DUAL,
- M25P80_QUAD,
-};
-
-struct m25p {
- struct spi_device *spi;
- struct mutex lock;
- struct mtd_info mtd;
- u16 page_size;
- u16 addr_width;
- u8 erase_opcode;
- u8 read_opcode;
- u8 program_opcode;
- u8 *command;
- enum read_type flash_read;
-};
-
-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;
-}
-
-/*
- * 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.
- */
-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);
-}
-
-/*
- * Enable/disable 4-byte addressing mode.
- */
-static inline int set_4byte(struct m25p *flash, u32 jedec_id, int enable)
-{
- int status;
- bool need_wren = false;
-
- switch (JEDEC_MFR(jedec_id)) {
- case CFI_MFR_ST: /* Micron, actually */
- /* Some Micron need WREN command; all will accept it */
- need_wren = true;
- case CFI_MFR_MACRONIX:
- case 0xEF /* winbond */:
- if (need_wren)
- write_enable(flash);
-
- flash->command[0] = enable ? OPCODE_EN4B : OPCODE_EX4B;
- status = spi_write(flash->spi, flash->command, 1);
-
- if (need_wren)
- write_disable(flash);
-
- return status;
- default:
- /* Spansion style */
- flash->command[0] = OPCODE_BRWR;
- flash->command[1] = enable << 7;
- return spi_write(flash->spi, flash->command, 2);
- }
-}
-
-/*
- * 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;
-}
-
-/*
- * 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.
- */
-static int erase_chip(struct m25p *flash)
-{
- pr_debug("%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);
- cmd[4] = addr >> (flash->addr_width * 8 - 32);
-}
-
-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)
-{
- pr_debug("%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;
-
- pr_debug("%s: %s at 0x%llx, len %lld\n", dev_name(&flash->spi->dev),
- __func__, (long long)instr->addr,
- (long long)instr->len);
-
- 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;
-}
-
-/*
- * 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_DUAL:
- 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_DUAL:
- return 2;
- 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.
- */
-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;
- uint8_t opcode;
- int dummy;
-
- pr_debug("%s: %s from 0x%08x, len %zd\n", dev_name(&flash->spi->dev),
- __func__, (u32)from, 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) + 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);
-
- 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;
- }
-
- /* Set up the write data buffer. */
- opcode = flash->read_opcode;
- flash->command[0] = opcode;
- m25p_addr2cmd(flash, from, flash->command);
-
- spi_sync(flash->spi, &m);
-
- *retlen = m.actual_length - m25p_cmdsz(flash) - dummy;
-
- 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;
-
- pr_debug("%s: %s to 0x%08x, len %zd\n", dev_name(&flash->spi->dev),
- __func__, (u32)to, len);
-
- 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] = flash->program_opcode;
- 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);
-
- *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;
-
- pr_debug("%s: %s to 0x%08x, len %zd\n", dev_name(&flash->spi->dev),
- __func__, (u32)to, len);
-
- 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;
-}
-
-static int m25p80_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
-{
- struct m25p *flash = mtd_to_m25p(mtd);
- uint32_t offset = ofs;
- uint8_t status_old, status_new;
- int res = 0;
-
- mutex_lock(&flash->lock);
- /* Wait until finished previous command */
- if (wait_till_ready(flash)) {
- res = 1;
- goto err;
- }
-
- status_old = read_sr(flash);
-
- if (offset < flash->mtd.size-(flash->mtd.size/2))
- status_new = status_old | SR_BP2 | SR_BP1 | SR_BP0;
- else if (offset < flash->mtd.size-(flash->mtd.size/4))
- status_new = (status_old & ~SR_BP0) | SR_BP2 | SR_BP1;
- else if (offset < flash->mtd.size-(flash->mtd.size/8))
- status_new = (status_old & ~SR_BP1) | SR_BP2 | SR_BP0;
- else if (offset < flash->mtd.size-(flash->mtd.size/16))
- status_new = (status_old & ~(SR_BP0|SR_BP1)) | SR_BP2;
- else if (offset < flash->mtd.size-(flash->mtd.size/32))
- status_new = (status_old & ~SR_BP2) | SR_BP1 | SR_BP0;
- else if (offset < flash->mtd.size-(flash->mtd.size/64))
- status_new = (status_old & ~(SR_BP2|SR_BP0)) | SR_BP1;
- else
- status_new = (status_old & ~(SR_BP2|SR_BP1)) | SR_BP0;
-
- /* Only modify protection if it will not unlock other areas */
- if ((status_new&(SR_BP2|SR_BP1|SR_BP0)) >
- (status_old&(SR_BP2|SR_BP1|SR_BP0))) {
- write_enable(flash);
- if (write_sr(flash, status_new) < 0) {
- res = 1;
- goto err;
- }
- }
-
-err: mutex_unlock(&flash->lock);
- return res;
-}
-
-static int m25p80_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
-{
- struct m25p *flash = mtd_to_m25p(mtd);
- uint32_t offset = ofs;
- uint8_t status_old, status_new;
- int res = 0;
-
- mutex_lock(&flash->lock);
- /* Wait until finished previous command */
- if (wait_till_ready(flash)) {
- res = 1;
- goto err;
- }
-
- status_old = read_sr(flash);
-
- if (offset+len > flash->mtd.size-(flash->mtd.size/64))
- status_new = status_old & ~(SR_BP2|SR_BP1|SR_BP0);
- else if (offset+len > flash->mtd.size-(flash->mtd.size/32))
- status_new = (status_old & ~(SR_BP2|SR_BP1)) | SR_BP0;
- else if (offset+len > flash->mtd.size-(flash->mtd.size/16))
- status_new = (status_old & ~(SR_BP2|SR_BP0)) | SR_BP1;
- else if (offset+len > flash->mtd.size-(flash->mtd.size/8))
- status_new = (status_old & ~SR_BP2) | SR_BP1 | SR_BP0;
- else if (offset+len > flash->mtd.size-(flash->mtd.size/4))
- status_new = (status_old & ~(SR_BP0|SR_BP1)) | SR_BP2;
- else if (offset+len > flash->mtd.size-(flash->mtd.size/2))
- status_new = (status_old & ~SR_BP1) | SR_BP2 | SR_BP0;
- else
- status_new = (status_old & ~SR_BP0) | SR_BP2 | SR_BP1;
-
- /* Only modify protection if it will not lock other areas */
- if ((status_new&(SR_BP2|SR_BP1|SR_BP0)) <
- (status_old&(SR_BP2|SR_BP1|SR_BP0))) {
- write_enable(flash);
- if (write_sr(flash, status_new) < 0) {
- res = 1;
- goto err;
- }
- }
-
-err: mutex_unlock(&flash->lock);
- return res;
-}
-
-/****************************************************************************/
-
-/*
- * 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 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_DUAL_READ 0x20 /* Flash supports Dual Read */
-#define M25P80_QUAD_READ 0x40 /* Flash supports Quad Read */
-};
-
-#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, \
- .flags = (_flags), \
- })
-
-#define CAT25_INFO(_sector_size, _n_sectors, _page_size, _addr_width, _flags) \
- ((kernel_ulong_t)&(struct flash_info) { \
- .sector_size = (_sector_size), \
- .n_sectors = (_n_sectors), \
- .page_size = (_page_size), \
- .addr_width = (_addr_width), \
- .flags = (_flags), \
- })
-
-/* 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) },
- { "at25df321a", INFO(0x1f4701, 0, 64 * 1024, 64, 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(0x1f4700, 0, 64 * 1024, 64, SECT_4K) },
-
- { "at45db081d", INFO(0x1f2500, 0, 64 * 1024, 16, SECT_4K) },
-
- /* EON -- en25xxx */
- { "en25f32", INFO(0x1c3116, 0, 64 * 1024, 64, SECT_4K) },
- { "en25p32", INFO(0x1c2016, 0, 64 * 1024, 64, 0) },
- { "en25q32b", INFO(0x1c3016, 0, 64 * 1024, 64, 0) },
- { "en25p64", INFO(0x1c2017, 0, 64 * 1024, 128, 0) },
- { "en25q64", INFO(0x1c3017, 0, 64 * 1024, 128, SECT_4K) },
- { "en25qh256", INFO(0x1c7019, 0, 64 * 1024, 512, 0) },
-
- /* ESMT */
- { "f25l32pa", INFO(0x8c2016, 0, 64 * 1024, 64, SECT_4K) },
-
- /* Everspin */
- { "mr25h256", CAT25_INFO( 32 * 1024, 1, 256, 2, M25P_NO_ERASE | M25P_NO_FR) },
- { "mr25h10", CAT25_INFO(128 * 1024, 1, 256, 3, M25P_NO_ERASE | M25P_NO_FR) },
-
- /* GigaDevice */
- { "gd25q32", INFO(0xc84016, 0, 64 * 1024, 64, SECT_4K) },
- { "gd25q64", INFO(0xc84017, 0, 64 * 1024, 128, SECT_4K) },
-
- /* Intel/Numonyx -- xxxs33b */
- { "160s33b", INFO(0x898911, 0, 64 * 1024, 32, 0) },
- { "320s33b", INFO(0x898912, 0, 64 * 1024, 64, 0) },
- { "640s33b", INFO(0x898913, 0, 64 * 1024, 128, 0) },
-
- /* Macronix */
- { "mx25l2005a", INFO(0xc22012, 0, 64 * 1024, 4, SECT_4K) },
- { "mx25l4005a", INFO(0xc22013, 0, 64 * 1024, 8, SECT_4K) },
- { "mx25l8005", INFO(0xc22014, 0, 64 * 1024, 16, 0) },
- { "mx25l1606e", INFO(0xc22015, 0, 64 * 1024, 32, SECT_4K) },
- { "mx25l3205d", INFO(0xc22016, 0, 64 * 1024, 64, 0) },
- { "mx25l3255e", INFO(0xc29e16, 0, 64 * 1024, 64, SECT_4K) },
- { "mx25l6405d", INFO(0xc22017, 0, 64 * 1024, 128, 0) },
- { "mx25l12805d", INFO(0xc22018, 0, 64 * 1024, 256, 0) },
- { "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, M25P80_QUAD_READ) },
- { "mx66l1g55g", INFO(0xc2261b, 0, 64 * 1024, 2048, M25P80_QUAD_READ) },
-
- /* Micron */
- { "n25q064", INFO(0x20ba17, 0, 64 * 1024, 128, 0) },
- { "n25q128a11", INFO(0x20bb18, 0, 64 * 1024, 256, 0) },
- { "n25q128a13", INFO(0x20ba18, 0, 64 * 1024, 256, 0) },
- { "n25q256a", INFO(0x20ba19, 0, 64 * 1024, 512, SECT_4K) },
- { "n25q512a", INFO(0x20bb20, 0, 64 * 1024, 1024, SECT_4K) },
-
- /* PMC */
- { "pm25lv512", INFO(0, 0, 32 * 1024, 2, SECT_4K_PMC) },
- { "pm25lv010", INFO(0, 0, 32 * 1024, 4, SECT_4K_PMC) },
- { "pm25lq032", INFO(0x7f9d46, 0, 64 * 1024, 64, SECT_4K) },
-
- /* Spansion -- single (large) sector size only, at least
- * for the chips listed here (without boot sectors).
- */
- { "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, M25P80_DUAL_READ | M25P80_QUAD_READ) },
- { "s25fl512s", INFO(0x010220, 0x4d00, 256 * 1024, 256, M25P80_DUAL_READ | 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) },
- { "s25fl129p0", INFO(0x012018, 0x4d00, 256 * 1024, 64, 0) },
- { "s25fl129p1", INFO(0x012018, 0x4d01, 64 * 1024, 256, 0) },
- { "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) },
- { "s25fl008k", INFO(0xef4014, 0, 64 * 1024, 16, SECT_4K) },
- { "s25fl016k", INFO(0xef4015, 0, 64 * 1024, 32, SECT_4K) },
- { "s25fl064k", INFO(0xef4017, 0, 64 * 1024, 128, SECT_4K) },
-
- /* SST -- large erase sizes are "overlays", "sectors" are 4K */
- { "sst25vf040b", INFO(0xbf258d, 0, 64 * 1024, 8, SECT_4K | SST_WRITE) },
- { "sst25vf080b", INFO(0xbf258e, 0, 64 * 1024, 16, SECT_4K | SST_WRITE) },
- { "sst25vf016b", INFO(0xbf2541, 0, 64 * 1024, 32, SECT_4K | SST_WRITE) },
- { "sst25vf032b", INFO(0xbf254a, 0, 64 * 1024, 64, SECT_4K | SST_WRITE) },
- { "sst25vf064c", INFO(0xbf254b, 0, 64 * 1024, 128, SECT_4K) },
- { "sst25wf512", INFO(0xbf2501, 0, 64 * 1024, 1, SECT_4K | SST_WRITE) },
- { "sst25wf010", INFO(0xbf2502, 0, 64 * 1024, 2, SECT_4K | SST_WRITE) },
- { "sst25wf020", INFO(0xbf2503, 0, 64 * 1024, 4, SECT_4K | SST_WRITE) },
- { "sst25wf040", INFO(0xbf2504, 0, 64 * 1024, 8, SECT_4K | SST_WRITE) },
-
- /* 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) },
- { "n25q032", INFO(0x20ba16, 0, 64 * 1024, 64, 0) },
-
- { "m25p05-nonjedec", INFO(0, 0, 32 * 1024, 2, 0) },
- { "m25p10-nonjedec", INFO(0, 0, 32 * 1024, 4, 0) },
- { "m25p20-nonjedec", INFO(0, 0, 64 * 1024, 4, 0) },
- { "m25p40-nonjedec", INFO(0, 0, 64 * 1024, 8, 0) },
- { "m25p80-nonjedec", INFO(0, 0, 64 * 1024, 16, 0) },
- { "m25p16-nonjedec", INFO(0, 0, 64 * 1024, 32, 0) },
- { "m25p32-nonjedec", INFO(0, 0, 64 * 1024, 64, 0) },
- { "m25p64-nonjedec", INFO(0, 0, 64 * 1024, 128, 0) },
- { "m25p128-nonjedec", INFO(0, 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) },
-
- { "m25pe20", INFO(0x208012, 0, 64 * 1024, 4, 0) },
- { "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) },
- { "m25px64", INFO(0x207117, 0, 64 * 1024, 128, 0) },
-
- /* 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) },
- { "w25q32", INFO(0xef4016, 0, 64 * 1024, 64, SECT_4K) },
- { "w25q32dw", INFO(0xef6016, 0, 64 * 1024, 64, SECT_4K) },
- { "w25x64", INFO(0xef3017, 0, 64 * 1024, 128, SECT_4K) },
- { "w25q64", INFO(0xef4017, 0, 64 * 1024, 128, SECT_4K) },
- { "w25q128", INFO(0xef4018, 0, 64 * 1024, 256, SECT_4K) },
- { "w25q80", INFO(0xef5014, 0, 64 * 1024, 16, SECT_4K) },
- { "w25q80bl", INFO(0xef4014, 0, 64 * 1024, 16, SECT_4K) },
- { "w25q128", INFO(0xef4018, 0, 64 * 1024, 256, SECT_4K) },
- { "w25q256", INFO(0xef4019, 0, 64 * 1024, 512, SECT_4K) },
-
- /* Catalyst / On Semiconductor -- non-JEDEC */
- { "cat25c11", CAT25_INFO( 16, 8, 16, 1, M25P_NO_ERASE | M25P_NO_FR) },
- { "cat25c03", CAT25_INFO( 32, 8, 16, 2, M25P_NO_ERASE | M25P_NO_FR) },
- { "cat25c09", CAT25_INFO( 128, 8, 32, 2, M25P_NO_ERASE | M25P_NO_FR) },
- { "cat25c17", CAT25_INFO( 256, 8, 32, 2, M25P_NO_ERASE | M25P_NO_FR) },
- { "cat25128", CAT25_INFO(2048, 8, 64, 2, M25P_NO_ERASE | M25P_NO_FR) },
- { },
-};
-MODULE_DEVICE_TABLE(spi, m25p_ids);
-
-static const struct spi_device_id *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) {
- pr_debug("%s: error %d reading JEDEC ID\n",
- dev_name(&spi->dev), tmp);
- return ERR_PTR(tmp);
- }
- jedec = id[0];
- jedec = jedec << 8;
- jedec |= id[1];
- jedec = jedec << 8;
- jedec |= id[2];
-
- 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)
- return &m25p_ids[tmp];
- }
- }
- dev_err(&spi->dev, "unrecognized JEDEC id %06x\n", jedec);
- return ERR_PTR(-ENODEV);
-}
-
-
-/*
- * 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 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;
- 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
- * 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 = dev_get_platdata(&spi->dev);
- 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 (i < ARRAY_SIZE(m25p_ids) - 1)
- 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 (IS_ERR(jid)) {
- return PTR_ERR(jid);
- } 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 = devm_kzalloc(&spi->dev, sizeof(*flash), GFP_KERNEL);
- if (!flash)
- return -ENOMEM;
-
- flash->command = devm_kzalloc(&spi->dev, MAX_CMD_SIZE, GFP_KERNEL);
- if (!flash->command)
- return -ENOMEM;
-
- flash->spi = spi;
- mutex_init(&flash->lock);
- spi_set_drvdata(spi, flash);
-
- /*
- * Atmel, SST and Intel/Numonyx serial flash tend to power
- * up with the software protection bits set
- */
-
- if (JEDEC_MFR(info->jedec_id) == CFI_MFR_ATMEL ||
- JEDEC_MFR(info->jedec_id) == CFI_MFR_INTEL ||
- JEDEC_MFR(info->jedec_id) == CFI_MFR_SST) {
- 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;
-
- /* flash protection support for STmicro chips */
- if (JEDEC_MFR(info->jedec_id) == CFI_MFR_ST) {
- flash->mtd._lock = m25p80_lock;
- flash->mtd._unlock = m25p80_unlock;
- }
-
- /* sst flash chips use AAI word program */
- if (info->flags & SST_WRITE)
- 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 if (info->flags & SECT_4K_PMC) {
- flash->erase_opcode = OPCODE_BE_4K_PMC;
- 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;
-
- ppdata.of_node = spi->dev.of_node;
- flash->mtd.dev.parent = &spi->dev;
- flash->page_size = info->page_size;
- flash->mtd.writebufsize = flash->page_size;
-
- if (np) {
- /* If we were instantiated by DT, use it */
- 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->flash_read = M25P80_FAST;
- }
-
- /* Some devices cannot do fast-read, no matter what DT tells us */
- if (info->flags & M25P_NO_FR)
- flash->flash_read = M25P80_NORMAL;
-
- /* Quad/Dual-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;
- } else if (spi->mode & SPI_RX_DUAL && info->flags & M25P80_DUAL_READ) {
- flash->flash_read = M25P80_DUAL;
- }
-
- /* Default commands */
- switch (flash->flash_read) {
- case M25P80_QUAD:
- flash->read_opcode = OPCODE_QUAD_READ;
- break;
- case M25P80_DUAL:
- flash->read_opcode = OPCODE_DUAL_READ;
- break;
- case M25P80_FAST:
- flash->read_opcode = OPCODE_FAST_READ;
- 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;
-
- if (info->addr_width)
- flash->addr_width = info->addr_width;
- else if (flash->mtd.size > 0x1000000) {
- /* enable 4-byte addressing if the device exceeds 16MiB */
- flash->addr_width = 4;
- if (JEDEC_MFR(info->jedec_id) == CFI_MFR_AMD) {
- /* Dedicated 4-byte command set */
- switch (flash->flash_read) {
- case M25P80_QUAD:
- flash->read_opcode = OPCODE_QUAD_READ_4B;
- break;
- case M25P80_DUAL:
- flash->read_opcode = OPCODE_DUAL_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;
- flash->mtd.erasesize = info->sector_size;
- } else
- set_4byte(flash, info->jedec_id, 1);
- } else {
- flash->addr_width = 3;
- }
-
- dev_info(&spi->dev, "%s (%lld Kbytes)\n", id->name,
- (long long)flash->mtd.size >> 10);
-
- pr_debug("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++)
- pr_debug("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).
- */
- return mtd_device_parse_register(&flash->mtd, NULL, &ppdata,
- data ? data->parts : NULL,
- data ? data->nr_parts : 0);
-}
-
-
-static int m25p_remove(struct spi_device *spi)
-{
- struct m25p *flash = spi_get_drvdata(spi);
-
- /* Clean up MTD stuff. */
- return mtd_device_unregister(&flash->mtd);
-}
-
-
-static struct spi_driver m25p80_driver = {
- .driver = {
- .name = "m25p80",
- .owner = THIS_MODULE,
- },
- .id_table = m25p_ids,
- .probe = m25p_probe,
- .remove = 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...
- */
-};
-
-module_spi_driver(m25p80_driver);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Mike Lavender");
-MODULE_DESCRIPTION("MTD SPI driver for ST M25Pxx flash chips");
+/*
+ * MTD SPI driver for ST M25Pxx (and similar) serial flash chips
+ *
+ * Author: Mike Lavender, mike at 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/err.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/device.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+
+#include <linux/spi/spi.h>
+#include <linux/spi/flash.h>
+#include <linux/mtd/spi-nor.h>
+
+#define MAX_CMD_SIZE 6
+struct m25p {
+ struct spi_device *spi;
+ struct spi_nor spi_nor;
+ struct mtd_info mtd;
+ u8 command[MAX_CMD_SIZE];
+};
+
+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;
+ int ret;
+
+ ret = spi_write_then_read(spi, &code, 1, val, len);
+ if (ret < 0)
+ dev_err(&spi->dev, "error %d reading %x\n", ret, code);
+
+ return ret;
+}
+
+static void m25p_addr2cmd(struct spi_nor *nor, unsigned int addr, u8 *cmd)
+{
+ /* opcode is in cmd[0] */
+ cmd[1] = addr >> (nor->addr_width * 8 - 8);
+ cmd[2] = addr >> (nor->addr_width * 8 - 16);
+ cmd[3] = addr >> (nor->addr_width * 8 - 24);
+ cmd[4] = addr >> (nor->addr_width * 8 - 32);
+}
+
+static int m25p_cmdsz(struct spi_nor *nor)
+{
+ return 1 + nor->addr_width;
+}
+
+static int m25p80_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len,
+ int wr_en)
+{
+ struct m25p *flash = nor->priv;
+ struct spi_device *spi = flash->spi;
+
+ flash->command[0] = opcode;
+ if (buf)
+ memcpy(&flash->command[1], buf, len);
+
+ return spi_write(spi, flash->command, len + 1);
+}
+
+static void m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf)
+{
+ struct m25p *flash = nor->priv;
+ struct spi_device *spi = flash->spi;
+ struct spi_transfer t[2] = {};
+ struct spi_message m;
+ int cmd_sz = m25p_cmdsz(nor);
+
+ spi_message_init(&m);
+
+ if (nor->program_opcode == OPCODE_AAI_WP && nor->sst_write_second)
+ cmd_sz = 1;
+
+ flash->command[0] = nor->program_opcode;
+ m25p_addr2cmd(nor, to, flash->command);
+
+ t[0].tx_buf = flash->command;
+ t[0].len = cmd_sz;
+ spi_message_add_tail(&t[0], &m);
+
+ t[1].tx_buf = buf;
+ t[1].len = len;
+ spi_message_add_tail(&t[1], &m);
+
+ 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.
+ */
+static int m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ struct m25p *flash = nor->priv;
+ struct spi_device *spi = flash->spi;
+ struct spi_transfer t[2];
+ struct spi_message m;
+ int dummy = nor->read_dummy;
+ int ret;
+
+ /* Wait till previous write/erase is done. */
+ ret = nor->wait_till_ready(nor);
+ if (ret)
+ return ret;
+
+ spi_message_init(&m);
+ memset(t, 0, (sizeof t));
+
+ flash->command[0] = nor->read_opcode;
+ m25p_addr2cmd(nor, from, flash->command);
+
+ t[0].tx_buf = flash->command;
+ t[0].len = m25p_cmdsz(nor) + dummy;
+ spi_message_add_tail(&t[0], &m);
+
+ t[1].rx_buf = buf;
+ t[1].rx_nbits = m25p80_rx_nbits(nor);
+ t[1].len = len;
+ spi_message_add_tail(&t[1], &m);
+
+ spi_sync(spi, &m);
+
+ *retlen = m.actual_length - m25p_cmdsz(nor) - dummy;
+ return 0;
+}
+
+static int m25p80_erase(struct spi_nor *nor, loff_t offset)
+{
+ struct m25p *flash = nor->priv;
+ int ret;
+
+ dev_dbg(nor->dev, "%dKiB at 0x%08x\n",
+ flash->mtd.erasesize / 1024, (u32)offset);
+
+ /* Wait until finished previous write command. */
+ ret = nor->wait_till_ready(nor);
+ if (ret)
+ return ret;
+
+ /* Send write enable, then erase commands. */
+ ret = nor->write_reg(nor, OPCODE_WREN, NULL, 0, 0);
+ if (ret)
+ return ret;
+
+ /* Set up command buffer. */
+ flash->command[0] = nor->erase_opcode;
+ m25p_addr2cmd(nor, offset, flash->command);
+
+ spi_write(flash->spi, flash->command, m25p_cmdsz(nor));
+
+ return 0;
+}
+
+/*
+ * 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 m25p_probe(struct spi_device *spi)
+{
+ struct mtd_part_parser_data ppdata;
+ struct flash_platform_data *data;
+ struct m25p *flash;
+ struct spi_nor *nor;
+ enum read_mode mode = SPI_NOR_NORMAL;
+ int ret;
+
+ flash = devm_kzalloc(&spi->dev, sizeof(*flash), GFP_KERNEL);
+ if (!flash)
+ return -ENOMEM;
+
+ nor = &flash->spi_nor;
+
+ /* install the hooks */
+ nor->read = m25p80_read;
+ nor->write = m25p80_write;
+ nor->erase = m25p80_erase;
+ nor->write_reg = m25p80_write_reg;
+ nor->read_reg = m25p80_read_reg;
+
+ nor->dev = &spi->dev;
+ nor->mtd = &flash->mtd;
+ nor->priv = flash;
+
+ spi_set_drvdata(spi, flash);
+ flash->mtd.priv = nor;
+ flash->spi = spi;
+
+ if (spi->mode & SPI_RX_QUAD)
+ mode = SPI_NOR_QUAD;
+ ret = spi_nor_scan(nor, spi_get_device_id(spi), mode);
+ if (ret)
+ return ret;
+
+ data = dev_get_platdata(&spi->dev);
+ ppdata.of_node = spi->dev.of_node;
+
+ return mtd_device_parse_register(&flash->mtd, NULL, &ppdata,
+ data ? data->parts : NULL,
+ data ? data->nr_parts : 0);
+}
+
+
+static int m25p_remove(struct spi_device *spi)
+{
+ struct m25p *flash = spi_get_drvdata(spi);
+
+ /* Clean up MTD stuff. */
+ return mtd_device_unregister(&flash->mtd);
+}
+
+
+static struct spi_driver m25p80_driver = {
+ .driver = {
+ .name = "m25p80",
+ .owner = THIS_MODULE,
+ },
+ .id_table = spi_nor_ids,
+ .probe = m25p_probe,
+ .remove = 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...
+ */
+};
+
+module_spi_driver(m25p80_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mike Lavender");
+MODULE_DESCRIPTION("MTD SPI driver for ST M25Pxx flash chips");
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