203 lines
4.5 KiB
C
203 lines
4.5 KiB
C
/*
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* (C) Copyright 2005
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* 2N Telekomunikace, a.s. <www.2n.cz>
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* Ladislav Michl <michl@2n.cz>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <linux/mtd/nand.h>
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#include <linux/mtd/mtd.h>
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#include <init.h>
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#include <xfuncs.h>
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#include <driver.h>
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#include <malloc.h>
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#include <ioctl.h>
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#include <nand.h>
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static ssize_t nand_read(struct device_d *dev, void* buf, size_t count, ulong offset, ulong flags)
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{
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struct mtd_info *info = dev->priv;
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size_t retlen;
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int ret;
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debug("nand_read: 0x%08x 0x%08x\n", offset, count);
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ret = info->read(info, offset, count, &retlen, buf);
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if(ret)
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return ret;
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return retlen;
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}
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#define NOTALIGNED(x) (x & (info->writesize - 1)) != 0
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static ssize_t nand_write(struct device_d* dev, const void* buf, size_t _count, ulong offset, ulong flags)
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{
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struct mtd_info *info = dev->priv;
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size_t retlen, now;
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int ret;
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void *wrbuf = NULL;
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size_t count = _count;
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debug("write: 0x%08x 0x%08x\n", offset, count);
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while (count) {
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now = count > info->writesize ? info->writesize : count;
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if (NOTALIGNED(now) || NOTALIGNED(offset)) {
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debug("not aligned: %d %d\n", info->writesize, (offset % info->writesize));
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wrbuf = xmalloc(info->writesize);
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memset(wrbuf, 0xff, info->writesize);
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memcpy(wrbuf + (offset % info->writesize), buf, now);
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ret = info->write(info, offset & ~(info->writesize - 1), info->writesize, &retlen, wrbuf);
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} else {
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ret = info->write(info, offset, now, &retlen, buf);
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debug("offset: 0x%08x now: 0x%08x retlen: 0x%08x\n", offset, now, retlen);
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}
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if (ret)
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goto out;
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offset += now;
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count -= now;
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buf += now;
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}
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out:
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if (wrbuf)
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free(wrbuf);
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return ret ? ret : _count;
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}
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static int nand_ioctl(struct device_d *dev, int request, void *buf)
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{
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struct mtd_info *info = dev->priv;
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struct mtd_info_user *user = buf;
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switch (request) {
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case MEMGETBADBLOCK:
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debug("MEMGETBADBLOCK: 0x%08x\n", (off_t)buf);
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return info->block_isbad(info, (off_t)buf);
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case MEMGETINFO:
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user->type = info->type;
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user->flags = info->flags;
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user->size = info->size;
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user->erasesize = info->erasesize;
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user->oobsize = info->oobsize;
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/* The below fields are obsolete */
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user->ecctype = -1;
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user->eccsize = 0;
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return 0;
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}
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return 0;
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}
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static ssize_t nand_erase(struct device_d *dev, size_t count, unsigned long offset)
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{
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struct mtd_info *info = dev->priv;
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struct erase_info erase;
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int ret;
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memset(&erase, 0, sizeof(erase));
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erase.mtd = info;
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erase.addr = offset;
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erase.len = info->erasesize;
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while (count > 0) {
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debug("erase %d %d\n", erase.addr, erase.len);
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ret = info->block_isbad(info, erase.addr);
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if (ret > 0) {
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printf("Skipping bad block at 0x%08x\n", erase.addr);
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} else {
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ret = info->erase(info, &erase);
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if (ret)
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return ret;
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}
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erase.addr += info->erasesize;
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count -= count > info->erasesize ? info->erasesize : count;
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}
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return 0;
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}
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static int nand_device_probe(struct device_d *dev)
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{
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return 0;
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}
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static struct driver_d nand_device_driver = {
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.name = "nand_device",
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.probe = nand_device_probe,
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.read = nand_read,
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.write = nand_write,
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.ioctl = nand_ioctl,
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.open = dev_open_default,
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.close = dev_close_default,
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.lseek = dev_lseek_default,
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.erase = nand_erase,
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.type = DEVICE_TYPE_NAND,
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};
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static int nand_init(void)
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{
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register_driver(&nand_device_driver);
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return 0;
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}
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device_initcall(nand_init);
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int add_mtd_device(struct mtd_info *mtd) {
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struct device_d *dev;
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int ret;
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dev = xzalloc(sizeof(*dev));
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strcpy(dev->name, "nand_device");
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get_free_deviceid(dev->id, "nand");
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dev->size = mtd->size;
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dev->type = DEVICE_TYPE_NAND;
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dev->priv = mtd;
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mtd->dev = dev;
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ret = register_device(dev);
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if (ret)
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goto out;
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return 0;
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out:
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free(dev);
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return ret;
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}
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int del_mtd_device (struct mtd_info *mtd)
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{
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unregister_device(mtd->dev);
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free(mtd->dev);
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return 0;
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}
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