diff options
Diffstat (limited to 'drivers/mtd/cfi_mtd.c')
| -rw-r--r-- | drivers/mtd/cfi_mtd.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/drivers/mtd/cfi_mtd.c b/drivers/mtd/cfi_mtd.c new file mode 100644 index 0000000000..cf82d92788 --- /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; +} |