[PATCH] [RFC] nor: Add SPI flash chips driver
Hubert Feurstein
h.feurstein at gmail.com
Sun Jul 31 11:46:34 EDT 2011
Hi Franck,
please fix the errors reported by ./scripts/checkpatch.pl.
Regards
Hubert
2011/7/30 <franck.jullien at gmail.com>:
> From: Franck Jullien <franck.jullien at gmail.com>
>
> This patch adds the m25p80 driver. It has been ported from
> Linux. MTD code has been removed. It has been tested with
> a m25p40 chip and the Altera SPI master driver.
>
> This driver has been placed in drivers/nor and CFI config
> has been moved to a submenu in Kconfig. Should I create a CFI
> folder in drivers/nor ?
>
> Signed-off-by: Franck Jullien <franck.jullien at gmail.com>
> ---
> drivers/nor/Kconfig | 41 +++-
> drivers/nor/Makefile | 1 +
> drivers/nor/m25p80.c | 829 ++++++++++++++++++++++++++++++++++++++++++++++++++
> drivers/nor/m25p80.h | 90 ++++++
> include/spi/flash.h | 30 ++
> 5 files changed, 986 insertions(+), 5 deletions(-)
> create mode 100644 drivers/nor/m25p80.c
> create mode 100644 drivers/nor/m25p80.h
> create mode 100644 include/spi/flash.h
>
> diff --git a/drivers/nor/Kconfig b/drivers/nor/Kconfig
> index 43a6b84..84ce0d0 100644
> --- a/drivers/nor/Kconfig
> +++ b/drivers/nor/Kconfig
> @@ -1,14 +1,16 @@
> menu "flash drivers "
>
> -config HAS_CFI
> - bool
> -
> -config DRIVER_CFI
> - bool "cfi flash driver"
> +menuconfig DRIVER_CFI
> + bool "CFI "
> help
> If you have NOR Flash devices connected to your system and wish
> to use them say yes here.
>
> +if DRIVER_CFI
> +
> +config HAS_CFI
> + bool
> +
> config DRIVER_CFI_INTEL
> default y
> depends on DRIVER_CFI
> @@ -55,4 +57,33 @@ config CFI_BUFFER_WRITE
> bool "use cfi driver with buffer write"
> depends on DRIVER_CFI || DRIVER_CFI
>
> +endif
> +
> +config MTD_M25P80
> + tristate "SPI Flash chips (AT26DF, M25P, W25X, ...)"
> + depends on SPI
> + help
> + This enables access to most modern SPI flash chips, used for
> + program and data storage. Series supported include Atmel AT26DF,
> + Spansion S25SL, SST 25VF, ST M25P, and Winbond W25X. Other chips
> + are supported as well. See the driver source for the current list,
> + or to add other chips.
> +
> + Note that the original DataFlash chips (AT45 series, not AT26DF),
> + need an entirely different driver.
> +
> + Set up your spi devices with the right board-specific platform data,
> + if you want to specify device partitioning or to use a device which
> + doesn't support the JEDEC ID instruction.
> +
> +config MTD_SST25L
> + tristate "Support SST25L (non JEDEC) SPI Flash chips"
> + depends on MTD_M25P80
> + help
> + This enables access to the non JEDEC SST25L SPI flash chips, used
> + for program and data storage.
> +
> + Set up your spi devices with the right board-specific platform data,
> + if you want to specify device partitioning.
> +
> endmenu
> diff --git a/drivers/nor/Makefile b/drivers/nor/Makefile
> index d255043..d676c55 100644
> --- a/drivers/nor/Makefile
> +++ b/drivers/nor/Makefile
> @@ -1,4 +1,5 @@
> obj-$(CONFIG_DRIVER_CFI) += cfi_flash.o
> obj-$(CONFIG_DRIVER_CFI_INTEL) += cfi_flash_intel.o
> obj-$(CONFIG_DRIVER_CFI_AMD) += cfi_flash_amd.o
> +obj-$(CONFIG_MTD_M25P80) += m25p80.o
>
> diff --git a/drivers/nor/m25p80.c b/drivers/nor/m25p80.c
> new file mode 100644
> index 0000000..9c57f16
> --- /dev/null
> +++ b/drivers/nor/m25p80.c
> @@ -0,0 +1,829 @@
> +/*
> + * MTD SPI driver for ST M25Pxx (and similar) serial flash chips
> + *
> + * Author: Mike Lavender, mike at steroidmicros.com
> + * Adapted to barebox : Franck JULLIEN <elec4fun at gmail.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 <common.h>
> +#include <init.h>
> +#include <driver.h>
> +#include <spi/spi.h>
> +#include <spi/flash.h>
> +#include <xfuncs.h>
> +#include <malloc.h>
> +#include <errno.h>
> +#include <linux/err.h>
> +#include <clock.h>
> +#include <linux/mtd/mtd.h>
> +#include <progress.h>
> +#include "m25p80.h"
> +
> +/****************************************************************************/
> +
> +/*
> + * 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);
> +}
> +
> +/*
> + * Enable/disable 4-byte addressing mode.
> + */
> +static inline int set_4byte(struct m25p *flash, int enable)
> +{
> + u8 code = enable ? OPCODE_EN4B : OPCODE_EX4B;
> +
> + 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)
> +{
> + int sr;
> + uint64_t timer_start;
> +
> + timer_start = get_time_ns();
> +
> + do {
> + if ((sr = read_sr(flash)) < 0)
> + break;
> + else if (!(sr & SR_WIP))
> + return 0;
> +
> + } while (!(is_timeout(timer_start, MAX_READY_WAIT * SECOND)));
> +
> + return 1;
> +}
> +
> +/*
> + * Erase the whole flash memory
> + *
> + * Returns 0 if successful, non-zero otherwise.
> + */
> +static int erase_chip(struct m25p *flash)
> +{
> + debug("%s: %s %lldKiB\n",
> + dev_name(&flash->spi->dev), __func__,
> + (long long)(flash->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)
> +{
> + debug("%s: %s %dKiB at 0x%08x\n",
> + dev_name(&flash->spi->dev), __func__,
> + flash->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;
> +}
> +
> +/*
> + * 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 ssize_t m25p80_erase(struct cdev *cdev, size_t count, unsigned long offset)
> +{
> + struct m25p *flash = cdev->priv;
> + u32 addr, len;
> + u32 start_sector;
> + u32 end_sector;
> + u32 progress = 0;
> +
> + debug("%s: %s %s 0x%llx, len %lld\n",
> + dev_name(&flash->spi->dev), __func__, "at",
> + (long long)offset, (long long)count);
> +
> + /* sanity checks */
> + if (offset + count > flash->size)
> + return -EINVAL;
> +
> + addr = offset;
> + len = count;
> +
> + start_sector = offset / flash->erasesize;
> + end_sector = (offset + count - 1) / flash->erasesize;
> + init_progression_bar(end_sector - start_sector);
> +
> + /* whole-chip erase? */
> + if (len == flash->size) {
> +
> + show_progress(start_sector);
> + if (erase_chip(flash))
> + return -EIO;
> + show_progress(end_sector);
> +
> + /* 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))
> + return -EIO;
> +
> + addr += flash->erasesize;
> + len -= flash->erasesize;
> + show_progress(progress++);
> + }
> + }
> +
> + printf("\n");
> +
> + return 0;
> +}
> +
> +ssize_t m25p80_read(struct cdev *cdev, void *buf, size_t count, ulong offset, ulong flags)
> +{
> + struct m25p *flash = cdev->priv;
> + struct spi_transfer t[2];
> + struct spi_message m;
> + ssize_t retlen;
> +
> + /* sanity checks */
> + if (!count)
> + return 0;
> +
> + if (offset + count > flash->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 = count;
> + spi_message_add_tail(&t[1], &m);
> +
> + /* Byte count starts at zero. */
> + retlen = 0;
> +
> + /* Wait till previous write/erase is done. */
> + if (wait_till_ready(flash))
> + return -ETIME;
> +
> + /* 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, offset, flash->command);
> +
> + spi_sync(flash->spi, &m);
> +
> + retlen = m.actual_length - m25p_cmdsz(flash) - FAST_READ_DUMMY_BYTE;
> +
> + return retlen;
> +}
> +
> +ssize_t m25p80_write(struct cdev *cdev, const void *buf, size_t count, ulong offset, ulong flags)
> +{
> + struct m25p *flash = cdev->priv;
> + struct spi_transfer t[2];
> + struct spi_message m;
> + ssize_t retlen = 0;
> + u32 page_offset, page_size;
> +
> + debug("m25p80_write %ld bytes at 0x%08lX\n", (unsigned long)count, offset);
> +
> + if (offset + count > flash->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);
> +
> + /* Wait until finished previous write command. */
> + if (wait_till_ready(flash))
> + return -ETIME;
> +
> + write_enable(flash);
> +
> + /* Set up the opcode in the write buffer. */
> + flash->command[0] = OPCODE_PP;
> + m25p_addr2cmd(flash, offset, flash->command);
> +
> + page_offset = offset & (flash->page_size - 1);
> +
> + /* do all the bytes fit onto one page? */
> + if (page_offset + count <= flash->page_size) {
> + t[1].len = count;
> +
> + 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 < count; i += page_size) {
> + page_size = count - i;
> + if (page_size > flash->page_size)
> + page_size = flash->page_size;
> +
> + /* write the next page to flash */
> + m25p_addr2cmd(flash, offset + 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);
> +
> + }
> + }
> +
> + return retlen;
> +}
> +#ifdef CONFIG_MTD_SST25L
> +ssize_t sst_write(struct cdev *cdev, const void *buf, size_t count, ulong offset, ulong flags)
> +{
> + struct m25p *flash = cdev->priv;
> + struct spi_transfer t[2];
> + struct spi_message m;
> + size_t actual;
> + ssize_t retlen;
> + int cmd_sz, ret;
> +
> + debug("sst_write %ld bytes at 0x%08lX\n", (unsigned long)count, offset);
> +
> + retlen = 0;
> +
> + /* sanity checks */
> + if (!count)
> + return 0;
> +
> + if (offset + count > flash->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);
> +
> + /* Wait until finished previous write command. */
> + ret = wait_till_ready(flash);
> + if (ret)
> + goto time_out;
> +
> + write_enable(flash);
> +
> + actual = offset % 2;
> + /* Start write from odd address. */
> + if (actual) {
> + flash->command[0] = OPCODE_BP;
> + m25p_addr2cmd(flash, offset, 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);
> + }
> + offset += actual;
> +
> + flash->command[0] = OPCODE_AAI_WP;
> + m25p_addr2cmd(flash, offset, flash->command);
> +
> + /* Write out most of the data here. */
> + cmd_sz = m25p_cmdsz(flash);
> + for (; actual < count - 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;
> + offset += 2;
> + }
> + write_disable(flash);
> + ret = wait_till_ready(flash);
> + if (ret)
> + goto time_out;
> +
> + /* Write out trailing byte if it exists. */
> + if (actual != count) {
> + write_enable(flash);
> + flash->command[0] = OPCODE_BP;
> + m25p_addr2cmd(flash, offset, 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:
> + return retlen;
> +}
> +#endif
> +
> +static void m25p80_info(struct device_d *dev)
> +{
> + struct m25p *flash = dev->priv;
> + struct flash_info *info = flash->info;
> +
> + printf("Flash type : %s\n", flash->name);
> + printf("Size : %lldKiB\n", (long long)flash->size / 1024);
> + printf("Number of sectors : %d\n", info->n_sectors);
> + printf("Sector size : %dKiB\n", info->sector_size / 1024);
> + printf("\n");
> +}
> +
> +
> +/****************************************************************************/
> +
> +/*
> + * SPI device driver setup and teardown
> + */
> +
> +#define INFO(_jedec_id, _ext_id, _sector_size, _n_sectors, _flags) \
> + ((unsigned long)&(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) \
> + ((unsigned long)&(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(0x1f4700, 0, 64 * 1024, 64, SECT_4K) },
> +
> + /* EON -- en25xxx */
> + { "en25f32", INFO(0x1c3116, 0, 64 * 1024, 64, SECT_4K) },
> + { "en25p32", INFO(0x1c2016, 0, 64 * 1024, 64, 0) },
> + { "en25p64", INFO(0x1c2017, 0, 64 * 1024, 128, 0) },
> +
> + /* 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 */
> + { "mx25l4005a", INFO(0xc22013, 0, 64 * 1024, 8, SECT_4K) },
> + { "mx25l8005", INFO(0xc22014, 0, 64 * 1024, 16, 0) },
> + { "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) },
> + { "mx25l25635e", INFO(0xc22019, 0, 64 * 1024, 512, 0) },
> + { "mx25l25655e", INFO(0xc22619, 0, 64 * 1024, 512, 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) },
> + { "s25sl032p", INFO(0x010215, 0x4d00, 64 * 1024, 64, SECT_4K) },
> + { "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) },
> + { "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) },
> + { "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) },
> +
> + { "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) },
> +
> + { "m25pe80", INFO(0x208014, 0, 64 * 1024, 16, 0) },
> + { "m25pe16", INFO(0x208015, 0, 64 * 1024, 32, 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) },
> + { "w25x64", INFO(0xef3017, 0, 64 * 1024, 128, SECT_4K) },
> + { "w25q64", INFO(0xef4017, 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) },
> + { },
> +};
> +
> +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.
> + */
> + spi_write_then_read(spi, &code, 1, id, 5);
> +
> + 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)
> + continue;
> + return &m25p_ids[tmp];
> + }
> + }
> + debug("unrecognized JEDEC id %06x\n", jedec);
> +
> + return NULL;
> +}
> +
> +
> +static struct file_operations m25p80_ops = {
> + .read = m25p80_read,
> + .write = m25p80_write,
> + .erase = m25p80_erase,
> + .lseek = dev_lseek_default,
> +};
> +
> +/*
> + * 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 device_d *dev)
> +{
> + struct spi_device *spi = (struct spi_device *)dev->type_data;
> + const struct spi_device_id *id = NULL;
> + struct flash_info *info = NULL;
> + struct flash_platform_data *data;
> + struct m25p *flash;
> + unsigned i;
> + unsigned do_jdec_probe = 1;
> +
> + /* 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->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 (i < ARRAY_SIZE(m25p_ids) - 1) {
> + id = plat_id;
> + info = (void *)id->driver_data;
> + /* If flash type is provided but the memory is not
> + * JEDEC compliant, don't try to probe the JEDEC id */
> + if (!info->jedec_id)
> + do_jdec_probe = 0;
> + } else
> + dev_warn(&spi->dev, "unrecognized id %s\n", data->type);
> + }
> +
> + if (do_jdec_probe) {
> + const struct spi_device_id *jid;
> +
> + jid = jedec_probe(spi);
> + if (!jid) {
> + return -ENODEV;
> + } 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.
> + */
> + if (id)
> + printf("%s: found %s, expected %s\n", dev->name,
> + jid->name, id->name);
> +
> + id = jid;
> + info = (void *)jid->driver_data;
> + }
> + }
> +
> + flash = xzalloc(sizeof *flash);
> + if (!flash)
> + return -ENOMEM;
> +
> + flash->command = xmalloc(MAX_CMD_SIZE + FAST_READ_DUMMY_BYTE);
> + if (!flash->command) {
> + free(flash);
> + return -ENOMEM;
> + }
> +
> + flash->spi = spi;
> + dev->priv = (void *)flash;
> + /*
> + * Atmel, SST and Intel/Numonyx serial flash tend to power
> + * up with the software protection bits set
> + */
> +
> + if (info->jedec_id >> 16 == 0x1f ||
> + info->jedec_id >> 16 == 0x89 ||
> + info->jedec_id >> 16 == 0xbf) {
> + write_enable(flash);
> + write_sr(flash, 0);
> + }
> +
> + flash->name = (char *)id->name;
> + flash->info = info;
> + flash->size = info->sector_size * info->n_sectors;
> + flash->erasesize = info->sector_size;
> + flash->cdev.size = info->sector_size * info->n_sectors;
> + flash->cdev.dev = dev;
> + flash->cdev.ops = &m25p80_ops;
> + flash->cdev.priv = flash;
> +
> + if (data && data->name)
> + flash->cdev.name = asprintf("%s%d", data->name, dev->id);
> + else
> + flash->cdev.name = asprintf("%s", (char *)dev_name(&spi->dev));
> +
> +#ifdef CONFIG_MTD_SST25L
> + /* sst flash chips use AAI word program */
> + if (info->jedec_id >> 16 == 0xbf)
> + m25p80_ops.write = sst_write;
> + else
> +#endif
> + m25p80_ops.write = m25p80_write;
> +
> + /* prefer "small sector" erase if possible */
> + if (info->flags & SECT_4K)
> + flash->erase_opcode = OPCODE_BE_4K;
> + else
> + flash->erase_opcode = OPCODE_SE;
> +
> + flash->page_size = info->page_size;
> +
> + if (info->addr_width)
> + flash->addr_width = info->addr_width;
> + else {
> + /* enable 4-byte addressing if the device exceeds 16MiB */
> + if (flash->size > 0x1000000) {
> + flash->addr_width = 4;
> + set_4byte(flash, 1);
> + } else
> + flash->addr_width = 3;
> + }
> +
> + printf("%s: %s (%lld Kbytes)\n", flash->cdev.name, id->name,
> + (long long)flash->size >> 10);
> +
> + devfs_create(&flash->cdev);
> +
> + return 0;
> +}
> +
> +static struct driver_d epcs_flash_driver = {
> + .name = "m25p",
> + .probe = m25p_probe,
> + .info = m25p80_info,
> +};
> +
> +static int epcs_init(void)
> +{
> + register_driver(&epcs_flash_driver);
> + return 0;
> +}
> +
> +device_initcall(epcs_init);
> +
> diff --git a/drivers/nor/m25p80.h b/drivers/nor/m25p80.h
> new file mode 100644
> index 0000000..3f9dd9c
> --- /dev/null
> +++ b/drivers/nor/m25p80.h
> @@ -0,0 +1,90 @@
> +#ifndef _M25P80_H_
> +#define _M25P80_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 */
> +
> +/* Used for Macronix flashes only. */
> +#define OPCODE_EN4B 0xb7 /* Enter 4-byte mode */
> +#define OPCODE_EX4B 0xe9 /* Exit 4-byte mode */
> +
> +/* 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 40 /* M25P16 specs 40s max chip erase */
> +#define MAX_CMD_SIZE 5
> +
> +#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
> +
> +#define SPI_NAME_SIZE 32
> +
> +struct spi_device_id {
> + char name[SPI_NAME_SIZE];
> + unsigned long driver_data;
> +};
> +
> +struct m25p {
> + struct spi_device *spi;
> + struct flash_info *info;
> + struct mtd_info mtd;
> + struct cdev cdev;
> + char *name;
> + u32 erasesize;
> + u16 page_size;
> + u16 addr_width;
> + u8 erase_opcode;
> + u8 *command;
> + u32 size;
> +};
> +
> +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 */
> +};
> +
> +#endif
> diff --git a/include/spi/flash.h b/include/spi/flash.h
> new file mode 100644
> index 0000000..cbd0203
> --- /dev/null
> +++ b/include/spi/flash.h
> @@ -0,0 +1,30 @@
> +#ifndef LINUX_SPI_FLASH_H
> +#define LINUX_SPI_FLASH_H
> +
> +struct mtd_partition;
> +
> +/**
> + * struct flash_platform_data: board-specific flash data
> + * @name: optional flash device name (eg, as used with mtdparts=)
> + * @parts: optional array of mtd_partitions for static partitioning
> + * @nr_parts: number of mtd_partitions for static partitoning
> + * @type: optional flash device type (e.g. m25p80 vs m25p64), for use
> + * with chips that can't be queried for JEDEC or other IDs
> + *
> + * Board init code (in arch/.../mach-xxx/board-yyy.c files) can
> + * provide information about SPI flash parts (such as DataFlash) to
> + * help set up the device and its appropriate default partitioning.
> + *
> + * Note that for DataFlash, sizes for pages, blocks, and sectors are
> + * rarely powers of two; and partitions should be sector-aligned.
> + */
> +struct flash_platform_data {
> + char *name;
> + struct mtd_partition *parts;
> + unsigned int nr_parts;
> + char *type;
> +
> + /* we'll likely add more ... use JEDEC IDs, etc */
> +};
> +
> +#endif
> --
> 1.7.6
>
>
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