u-boot/drivers/mtd/cfi_mtd.c
Ladislav Michl f3dec798d9 CFI: fix eraseregions numblocks
eraseregions numblocks was sometimes one less than actual, possibly producing
erase regions with zero blocks. As MTD code touches eraseregions only if
numeraseregions is greater that zero, allocate eraseregions only for non
uniform erase size flash.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Stefan Roese <sr@denx.de>
2010-02-02 08:22:00 +01:00

284 lines
6.5 KiB
C

/*
* (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 <malloc.h>
#include <asm/errno.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/concat.h>
/* use CONFIG_SYS_MAX_FLASH_BANKS_DETECT if defined */
#ifdef CONFIG_SYS_MAX_FLASH_BANKS_DETECT
# define CFI_MAX_FLASH_BANKS CONFIG_SYS_MAX_FLASH_BANKS_DETECT
#else
# define CFI_MAX_FLASH_BANKS CONFIG_SYS_MAX_FLASH_BANKS
#endif
extern flash_info_t flash_info[];
static struct mtd_info cfi_mtd_info[CFI_MAX_FLASH_BANKS];
static char cfi_mtd_names[CFI_MAX_FLASH_BANKS][16];
#ifdef CONFIG_MTD_CONCAT
static char c_mtd_name[16];
#endif
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; sect++) {
if (a_start == fi->start[sect])
s_first = sect;
if (sect < fi->sector_count - 1) {
if (a_end == fi->start[sect + 1]) {
s_last = sect;
break;
}
} else {
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, uint64_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, uint64_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_size_old = 0;
int sect;
int regions = 0;
int numblocks = 0;
ulong offset;
ulong base_addr;
/*
* First detect the number of eraseregions so that we can allocate
* the array of eraseregions correctly
*/
for (sect = 0; sect < fi->sector_count; sect++) {
if (sect_size_old != flash_sector_size(fi, sect))
regions++;
sect_size_old = flash_sector_size(fi, sect);
}
switch (regions) {
case 0:
return 1;
case 1: /* flash has uniform erase size */
mtd->numeraseregions = 0;
mtd->erasesize = sect_size_old;
return 0;
}
mtd->numeraseregions = regions;
mtd->eraseregions = malloc(sizeof(struct mtd_erase_region_info) * regions);
/*
* Now detect the largest sector and fill the eraseregions
*/
regions = 0;
base_addr = offset = fi->start[0];
sect_size_old = flash_sector_size(fi, 0);
for (sect = 0; sect < fi->sector_count; sect++) {
if (sect_size_old != flash_sector_size(fi, sect)) {
mtd->eraseregions[regions].offset = offset - base_addr;
mtd->eraseregions[regions].erasesize = sect_size_old;
mtd->eraseregions[regions].numblocks = numblocks;
/* Now start counting the next eraseregions */
numblocks = 0;
regions++;
offset = fi->start[sect];
}
numblocks++;
/*
* Select the largest sector size as erasesize (e.g. for UBI)
*/
if (flash_sector_size(fi, sect) > sect_size)
sect_size = flash_sector_size(fi, sect);
sect_size_old = flash_sector_size(fi, sect);
}
/*
* Set the last region
*/
mtd->eraseregions[regions].offset = offset - base_addr;
mtd->eraseregions[regions].erasesize = sect_size_old;
mtd->eraseregions[regions].numblocks = numblocks;
mtd->erasesize = sect_size;
return 0;
}
int cfi_mtd_init(void)
{
struct mtd_info *mtd;
flash_info_t *fi;
int error, i;
int devices_found = 0;
struct mtd_info *mtd_list[CONFIG_SYS_MAX_FLASH_BANKS];
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;
sprintf(cfi_mtd_names[i], "nor%d", i);
mtd->name = cfi_mtd_names[i];
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;
mtd_list[devices_found++] = mtd;
}
#ifdef CONFIG_MTD_CONCAT
if (devices_found > 1) {
/*
* We detected multiple devices. Concatenate them together.
*/
sprintf(c_mtd_name, "nor%d", devices_found);
mtd = mtd_concat_create(mtd_list, devices_found, c_mtd_name);
if (mtd == NULL)
return -ENXIO;
if (add_mtd_device(mtd))
return -ENOMEM;
}
#endif /* CONFIG_MTD_CONCAT */
return 0;
}