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/*
* (C) Copyright 2005
* 2N Telekomunikace, a.s. <www.2n.cz>
* Ladislav Michl <michl@2n.cz>
*
* 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
* version 2 as published by the Free Software Foundation.
*
* 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.
*/
#include <common.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/mtd.h>
#include <init.h>
#include <xfuncs.h>
#include <driver.h>
#include <malloc.h>
#include <ioctl.h>
#include <nand.h>
#include <errno.h>
#include "mtd.h"
static LIST_HEAD(mtd_register_hooks);
static ssize_t mtd_read(struct cdev *cdev, void* buf, size_t count,
loff_t _offset, ulong flags)
{
struct mtd_info *mtd = cdev->priv;
size_t retlen;
int ret;
unsigned long offset = _offset;
debug("mtd_read: 0x%08lx 0x%08x\n", offset, count);
ret = mtd->read(mtd, offset, count, &retlen, buf);
if(ret) {
printf("err %d\n", ret);
return ret;
}
return retlen;
}
#define NOTALIGNED(x) (x & (mtd->writesize - 1)) != 0
#define MTDPGALG(x) ((x) & ~(mtd->writesize - 1))
#ifdef CONFIG_MTD_WRITE
static int all_ff(const void *buf, int len)
{
int i;
const uint8_t *p = buf;
for (i = 0; i < len; i++)
if (p[i] != 0xFF)
return 0;
return 1;
}
static ssize_t mtd_write(struct cdev* cdev, const void *buf, size_t _count,
loff_t _offset, ulong flags)
{
struct mtd_info *mtd = cdev->priv;
size_t retlen, now;
int ret = 0;
void *wrbuf = NULL;
size_t count = _count;
unsigned long offset = _offset;
if (NOTALIGNED(offset)) {
printf("offset 0x%0lx not page aligned\n", offset);
return -EINVAL;
}
dev_dbg(cdev->dev, "write: 0x%08lx 0x%08x\n", offset, count);
while (count) {
now = count > mtd->writesize ? mtd->writesize : count;
if (NOTALIGNED(now)) {
dev_dbg(cdev->dev, "not aligned: %d %ld\n",
mtd->writesize,
(offset % mtd->writesize));
wrbuf = xmalloc(mtd->writesize);
memset(wrbuf, 0xff, mtd->writesize);
memcpy(wrbuf + (offset % mtd->writesize), buf, now);
if (!all_ff(wrbuf, mtd->writesize))
ret = mtd->write(mtd, MTDPGALG(offset),
mtd->writesize, &retlen,
wrbuf);
free(wrbuf);
} else {
if (!all_ff(buf, mtd->writesize))
ret = mtd->write(mtd, offset, now, &retlen,
buf);
dev_dbg(cdev->dev,
"offset: 0x%08lx now: 0x%08x retlen: 0x%08x\n",
offset, now, retlen);
}
if (ret)
goto out;
offset += now;
count -= now;
buf += now;
}
out:
return ret ? ret : _count;
}
#endif
int mtd_ioctl(struct cdev *cdev, int request, void *buf)
{
int ret = 0;
struct mtd_info *mtd = cdev->priv;
struct mtd_info_user *user = buf;
#if (defined(CONFIG_NAND_ECC_HW) || defined(CONFIG_NAND_ECC_SOFT))
struct mtd_ecc_stats *ecc = buf;
#endif
struct region_info_user *reg = buf;
loff_t *offset = buf;
switch (request) {
case MEMGETBADBLOCK:
dev_dbg(cdev->dev, "MEMGETBADBLOCK: 0x%08llx\n", *offset);
ret = mtd->block_isbad(mtd, *offset);
break;
#ifdef CONFIG_MTD_WRITE
case MEMSETBADBLOCK:
dev_dbg(cdev->dev, "MEMSETBADBLOCK: 0x%08llx\n", *offset);
ret = mtd->block_markbad(mtd, *offset);
break;
#endif
case MEMGETINFO:
user->type = mtd->type;
user->flags = mtd->flags;
user->size = mtd->size;
user->erasesize = mtd->erasesize;
user->oobsize = mtd->oobsize;
user->mtd = mtd;
/* The below fields are obsolete */
user->ecctype = -1;
user->eccsize = 0;
break;
#if (defined(CONFIG_NAND_ECC_HW) || defined(CONFIG_NAND_ECC_SOFT))
case ECCGETSTATS:
ecc->corrected = mtd->ecc_stats.corrected;
ecc->failed = mtd->ecc_stats.failed;
ecc->badblocks = mtd->ecc_stats.badblocks;
ecc->bbtblocks = mtd->ecc_stats.bbtblocks;
break;
#endif
case MEMGETREGIONINFO:
if (cdev->mtd) {
unsigned long size = cdev->size;
reg->offset = cdev->offset;
reg->erasesize = cdev->mtd->erasesize;
reg->numblocks = size / reg->erasesize;
reg->regionindex = cdev->mtd->index;
}
break;
default:
ret = -EINVAL;
}
return ret;
}
#ifdef CONFIG_MTD_WRITE
static ssize_t mtd_erase(struct cdev *cdev, size_t count, loff_t offset)
{
struct mtd_info *mtd = cdev->priv;
struct erase_info erase;
int ret;
memset(&erase, 0, sizeof(erase));
erase.mtd = mtd;
erase.addr = offset;
erase.len = mtd->erasesize;
while (count > 0) {
dev_dbg(cdev->dev, "erase %d %d\n", erase.addr, erase.len);
ret = mtd->block_isbad(mtd, erase.addr);
if (ret > 0) {
printf("Skipping bad block at 0x%08x\n", erase.addr);
} else {
ret = mtd->erase(mtd, &erase);
if (ret)
return ret;
}
erase.addr += mtd->erasesize;
count -= count > mtd->erasesize ? mtd->erasesize : count;
}
return 0;
}
#endif
static struct file_operations mtd_ops = {
.read = mtd_read,
#ifdef CONFIG_MTD_WRITE
.write = mtd_write,
.erase = mtd_erase,
#endif
.ioctl = mtd_ioctl,
.lseek = dev_lseek_default,
};
int add_mtd_device(struct mtd_info *mtd, char *devname)
{
char str[16];
struct mtddev_hook *hook;
if (!devname)
devname = "mtd";
strcpy(mtd->class_dev.name, devname);
mtd->class_dev.id = DEVICE_ID_DYNAMIC;
register_device(&mtd->class_dev);
mtd->cdev.ops = &mtd_ops;
mtd->cdev.size = mtd->size;
mtd->cdev.name = asprintf("%s%d", devname, mtd->class_dev.id);
mtd->cdev.priv = mtd;
mtd->cdev.dev = &mtd->class_dev;
mtd->cdev.mtd = mtd;
if (IS_ENABLED(CONFIG_PARAMETER)) {
sprintf(str, "%u", mtd->size);
dev_add_param_fixed(&mtd->class_dev, "size", str);
sprintf(str, "%u", mtd->erasesize);
dev_add_param_fixed(&mtd->class_dev, "erasesize", str);
sprintf(str, "%u", mtd->writesize);
dev_add_param_fixed(&mtd->class_dev, "writesize", str);
sprintf(str, "%u", mtd->oobsize);
dev_add_param_fixed(&mtd->class_dev, "oobsize", str);
}
devfs_create(&mtd->cdev);
list_for_each_entry(hook, &mtd_register_hooks, hook)
if (hook->add_mtd_device)
hook->add_mtd_device(mtd, devname);
return 0;
}
int del_mtd_device (struct mtd_info *mtd)
{
struct mtddev_hook *hook;
list_for_each_entry(hook, &mtd_register_hooks, hook)
if (hook->del_mtd_device)
hook->del_mtd_device(mtd);
unregister_device(&mtd->class_dev);
free(mtd->param_size.value);
free(mtd->cdev.name);
return 0;
}
void mtdcore_add_hook(struct mtddev_hook *hook)
{
list_add(&hook->hook, &mtd_register_hooks);
}
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