Add cfi-mtd driver, which exports CFI flash to MTD layer. This allows CFI flash devices to be used from MTD layer.
Building of the new driver is controlled by CONFIG_FLASH_CFI_MTD option. Initialization is done by calling cfi_mtd_init() from flash_init().
Signed-off-by: Piotr Ziecik kosmo@semihalf.com --- This patch requires following (already posted) patches: - flash: Exported flash_sector_size() function. - flash: Added interface for flash verbosity control.
README | 5 + drivers/mtd/Makefile | 1 + drivers/mtd/cfi_flash.c | 5 + drivers/mtd/cfi_mtd.c | 202 +++++++++++++++++++++++++++++++++++++++++++++++ include/flash.h | 8 ++ 5 files changed, 221 insertions(+), 0 deletions(-) create mode 100644 drivers/mtd/cfi_mtd.c
diff --git a/README b/README index ebee20f..e43dbb1 100644 --- a/README +++ b/README @@ -2155,6 +2155,11 @@ Configuration Settings: This option also enables the building of the cfi_flash driver in the drivers directory
+- CONFIG_FLASH_CFI_MTD + This option enables the building of the cfi_mtd driver + in the drivers directory. The driver exports CFI flash + to the MTD layer. + - CONFIG_SYS_FLASH_USE_BUFFER_WRITE Use buffered writes to flash.
diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile index d225a68..b665a97 100644 --- a/drivers/mtd/Makefile +++ b/drivers/mtd/Makefile @@ -28,6 +28,7 @@ LIB := $(obj)libmtd.a COBJS-$(CONFIG_CMD_UBI) += mtdcore.o mtdpart.o COBJS-$(CONFIG_HAS_DATAFLASH) += at45.o COBJS-$(CONFIG_FLASH_CFI_DRIVER) += cfi_flash.o +COBJS-$(CONFIG_FLASH_CFI_MTD) += cfi_mtd.o COBJS-$(CONFIG_HAS_DATAFLASH) += dataflash.o COBJS-$(CONFIG_FLASH_CFI_LEGACY) += jedec_flash.o COBJS-$(CONFIG_MW_EEPROM) += mw_eeprom.o diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c index d828e77..13dc320 100644 --- a/drivers/mtd/cfi_flash.c +++ b/drivers/mtd/cfi_flash.c @@ -2068,5 +2068,10 @@ unsigned long flash_init (void) flash_get_info(apl[i].start)); } #endif + +#ifdef CONFIG_FLASH_CFI_MTD + cfi_mtd_init(); +#endif + return (size); } diff --git a/drivers/mtd/cfi_mtd.c b/drivers/mtd/cfi_mtd.c new file mode 100644 index 0000000..cf82d92 --- /dev/null +++ b/drivers/mtd/cfi_mtd.c @@ -0,0 +1,202 @@ +/* + * (C) Copyright 2008 Semihalf + * + * Written by: Piotr Ziecik kosmo@semihalf.com + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + * + */ + +#include <common.h> +#include <flash.h> + +#include <asm/errno.h> +#include <linux/mtd/mtd.h> + +extern flash_info_t flash_info[]; + +static struct mtd_info cfi_mtd_info[CONFIG_SYS_MAX_FLASH_BANKS]; + +static int cfi_mtd_erase(struct mtd_info *mtd, struct erase_info *instr) +{ + flash_info_t *fi = mtd->priv; + size_t a_start = fi->start[0] + instr->addr; + size_t a_end = a_start + instr->len; + int s_first = -1; + int s_last = -1; + int error, sect; + + for (sect = 0; sect < fi->sector_count - 1; sect++) { + if (a_start == fi->start[sect]) + s_first = sect; + + if (a_end == fi->start[sect + 1]) { + s_last = sect; + break; + } + } + + if (s_first >= 0 && s_first <= s_last) { + instr->state = MTD_ERASING; + + flash_set_verbose(0); + error = flash_erase(fi, s_first, s_last); + flash_set_verbose(1); + + if (error) { + instr->state = MTD_ERASE_FAILED; + return -EIO; + } + + instr->state = MTD_ERASE_DONE; + mtd_erase_callback(instr); + return 0; + } + + return -EINVAL; +} + +static int cfi_mtd_read(struct mtd_info *mtd, loff_t from, size_t len, + size_t *retlen, u_char *buf) +{ + flash_info_t *fi = mtd->priv; + u_char *f = (u_char*)(fi->start[0]) + from; + + memcpy(buf, f, len); + *retlen = len; + + return 0; +} + +static int cfi_mtd_write(struct mtd_info *mtd, loff_t to, size_t len, + size_t *retlen, const u_char *buf) +{ + flash_info_t *fi = mtd->priv; + u_long t = fi->start[0] + to; + int error; + + flash_set_verbose(0); + error = write_buff(fi, (u_char*)buf, t, len); + flash_set_verbose(1); + + if (!error) { + *retlen = len; + return 0; + } + + return -EIO; +} + +static void cfi_mtd_sync(struct mtd_info *mtd) +{ + /* + * This function should wait until all pending operations + * finish. However this driver is fully synchronous, so + * this function returns immediately + */ +} + +static int cfi_mtd_lock(struct mtd_info *mtd, loff_t ofs, size_t len) +{ + flash_info_t *fi = mtd->priv; + + flash_set_verbose(0); + flash_protect(FLAG_PROTECT_SET, fi->start[0] + ofs, + fi->start[0] + ofs + len - 1, fi); + flash_set_verbose(1); + + return 0; +} + +static int cfi_mtd_unlock(struct mtd_info *mtd, loff_t ofs, size_t len) +{ + flash_info_t *fi = mtd->priv; + + flash_set_verbose(0); + flash_protect(FLAG_PROTECT_CLEAR, fi->start[0] + ofs, + fi->start[0] + ofs + len - 1, fi); + flash_set_verbose(1); + + return 0; +} + +static int cfi_mtd_set_erasesize(struct mtd_info *mtd, flash_info_t *fi) +{ + int sect_size = 0; + int sect; + + for (sect = 0; sect < fi->sector_count; sect++) { + if (!sect_size) { + sect_size = flash_sector_size(fi, sect); + continue; + } + + if (sect_size != flash_sector_size(fi, sect)) { + sect_size = 0; + break; + } + } + + if (!sect_size) { + puts("cfi-mtd: devices with multiple sector sizes are" + "not supported\n"); + return -EINVAL; + } + + mtd->erasesize = sect_size; + + return 0; +} + +int cfi_mtd_init(void) +{ + struct mtd_info *mtd; + flash_info_t *fi; + int error, i; + + for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) { + fi = &flash_info[i]; + mtd = &cfi_mtd_info[i]; + + memset(mtd, 0, sizeof(struct mtd_info)); + + error = cfi_mtd_set_erasesize(mtd, fi); + if (error) + continue; + + mtd->name = CFI_MTD_DEV_NAME; + mtd->type = MTD_NORFLASH; + mtd->flags = MTD_CAP_NORFLASH; + mtd->size = fi->size; + mtd->writesize = 1; + + mtd->erase = cfi_mtd_erase; + mtd->read = cfi_mtd_read; + mtd->write = cfi_mtd_write; + mtd->sync = cfi_mtd_sync; + mtd->lock = cfi_mtd_lock; + mtd->unlock = cfi_mtd_unlock; + mtd->priv = fi; + + if (add_mtd_device(mtd)) + return -ENOMEM; + } + + return 0; +} diff --git a/include/flash.h b/include/flash.h index 05fa572..6e2981c 100644 --- a/include/flash.h +++ b/include/flash.h @@ -86,6 +86,9 @@ typedef unsigned long flash_sect_t;
/* convert between bit value and numeric value */ #define CFI_FLASH_SHIFT_WIDTH 3 + +/* cfi-mtd device name */ +#define CFI_MTD_DEV_NAME "cfi-mtd" /* Prototypes */
extern unsigned long flash_init (void); @@ -103,6 +106,11 @@ extern int flash_write (char *, ulong, ulong); extern flash_info_t *addr2info (ulong); extern int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt);
+/* drivers/mtd/cfi_mtd.c */ +#ifdef CONFIG_FLASH_CFI_MTD +extern int cfi_mtd_init(void); +#endif + /* board/?/flash.c */ #if defined(CONFIG_SYS_FLASH_PROTECTION) extern int flash_real_protect(flash_info_t *info, long sector, int prot);