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/*
* Author: Sebastian Block <basti@linux-source.de>
* Copyright (c) 2014
*
* Some parts are based on mtdram.c found in Linux kernel
* by Alexander Larsson <alex@cendio.se>
* and Joern Engel <joern@wh.fh-wedel.de>.
*
* This code 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.
*
*/
#include <common.h>
#include <environment.h>
#include <errno.h>
#include <init.h>
#include <io.h>
#include <linux/mtd/mtd.h>
#include <malloc.h>
#include <of.h>
struct mtdram_priv_data {
struct mtd_info mtd;
void *base;
};
static int ram_erase(struct mtd_info *mtd, struct erase_info *instr)
{
memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
instr->state = MTD_ERASE_DONE;
mtd_erase_callback(instr);
return 0;
}
static int ram_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
{
memcpy((char*)mtd->priv + to, buf, len);
*retlen = len;
return 0;
}
static int ram_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
{
memcpy(buf, mtd->priv + from, len);
*retlen = len;
return 0;
}
static int mtdram_probe(struct device_d *dev)
{
struct resource *iores;
void __iomem *base;
int device_id;
struct mtd_info *mtd;
struct resource *res;
loff_t size;
int ret = 0;
mtd = xzalloc(sizeof(struct mtd_info));
device_id = DEVICE_ID_SINGLE;
if (dev->device_node) {
const char *alias = of_alias_get(dev->device_node);
if (alias)
mtd->name = xstrdup(alias);
}
if (!mtd->name) {
device_id = DEVICE_ID_DYNAMIC;
mtd->name = "mtdram";
}
iores = dev_request_mem_resource(dev, 0);
if (IS_ERR(iores)) {
ret = PTR_ERR(iores);
goto nobase;
}
base = IOMEM(iores->start);
res = dev_get_resource(dev, IORESOURCE_MEM, 0);
size = (unsigned long) resource_size(res);
mtd->priv = base;
mtd->type = MTD_RAM;
mtd->writesize = 1;
mtd->writebufsize = 64;
mtd->flags = MTD_CAP_RAM;
mtd->size = size;
mtd->read = ram_read;
mtd->write = ram_write;
mtd->erase = ram_erase;
mtd->erasesize = 1;
mtd->parent = dev;
ret = add_mtd_device(mtd, mtd->name, device_id);
return ret;
nobase:
kfree(mtd);
return ret;
}
static __maybe_unused struct of_device_id mtdram_dt_ids[] = {
{
.compatible = "mtd-ram",
}, {
/* sentinel */
}
};
static struct driver_d mtdram_driver = {
.name = "mtdram",
.probe = mtdram_probe,
.of_compatible = DRV_OF_COMPAT(mtdram_dt_ids),
};
device_platform_driver(mtdram_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Sebastian Block");
MODULE_DESCRIPTION("MTD RAM driver for NVRAMs");
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