/*
* Normal mappings of chips in physical memory for OF devices
*
* Copyright (C) 2006 MontaVista Software Inc.
* Author: Vitaly Wool <vwool@ru.mvista.com>
*
* 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.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/physmap.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/of_device.h>
#include <asm/of_platform.h>
struct physmap_flash_info {
struct mtd_info *mtd;
struct map_info map;
struct resource *res;
#ifdef CONFIG_MTD_PARTITIONS
int nr_parts;
struct mtd_partition *parts;
#endif
};
static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
#ifdef CONFIG_MTD_PARTITIONS
static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
#endif
#ifdef CONFIG_MTD_PARTITIONS
static int parse_flash_partitions(struct device_node *node,
struct mtd_partition **parts)
{
int i, plen, retval = -ENOMEM;
const u32 *part;
const char *name;
part = of_get_property(node, "partitions", &plen);
if (part == NULL)
goto err;
retval = plen / (2 * sizeof(u32));
*parts = kzalloc(retval * sizeof(struct mtd_partition), GFP_KERNEL);
if (*parts == NULL) {
printk(KERN_ERR "Can't allocate the flash partition data!\n");
goto err;
}
name = of_get_property(node, "partition-names", &plen);
for (i = 0; i < retval; i++) {
(*parts)[i].offset = *part++;
(*parts)[i].size = *part & ~1;
if (*part++ & 1) /* bit 0 set signifies read only partition */
(*parts)[i].mask_flags = MTD_WRITEABLE;
if (name != NULL && plen > 0) {
int len = strlen(name) + 1;
(*parts)[i].name = (char *)name;
plen -= len;
name += len;
} else
(*parts)[i].name = "unnamed";
}
err:
return retval;
}
#endif
static int of_physmap_remove(struct of_device *dev)
{
struct physmap_flash_info *info;
info = dev_get_drvdata(&dev->dev);
if (info == NULL)
return 0;
dev_set_drvdata(&dev->dev, NULL);
if (info->mtd != NULL) {
#ifdef CONFIG_MTD_PARTITIONS
if (info->nr_parts) {
del_mtd_partitions(info->mtd);
kfree(info->parts);
} else {
del_mtd_device(info->mtd);
}
#else
del_mtd_device(info->mtd);
#endif
map_destroy(info->mtd);
}
if (info->map.virt != NULL)
iounmap(info->map.virt);
if (info->res != NULL) {
release_resource(info->res);
kfree(info->res);
}
return 0;
}
static int __devinit of_physmap_probe(struct of_device *dev, const struct of_device_id *match)
{
struct device_node *dp = dev->node;
struct resource res;
struct physmap_flash_info *info;
const char **probe_type;
const char *of_probe;
const u32 *width;
int err;
if (of_address_to_resource(dp, 0, &res)) {
dev_err(&dev->dev, "Can't get the flash mapping!\n");
err = -EINVAL;
goto err_out;
}
dev_dbg(&dev->dev, "physmap flash device: %.8llx at %.8llx\n",
(unsigned long long)res.end - res.start + 1,
(unsigned long long)res.start);
info = kzalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
if (info == NULL) {
err = -ENOMEM;
goto err_out;
}
memset(info, 0, sizeof(*info));
dev_set_drvdata(&dev->dev, info);
info->res = request_mem_region(res.start, res.end - res.start + 1,
dev->dev.bus_id);
if (info->res == NULL) {
dev_err(&dev->dev, "Could not reserve memory region\n");
err = -ENOMEM;
goto err_out;
}
width = of_get_property(dp, "bank-width", NULL);
if (width == NULL) {
dev_err(&dev->dev, "Can't get the flash bank width!\n");
err = -EINVAL;
goto err_out;
}
info->map.name = dev->dev.bus_id;
info->map.phys = res.start;
info->map.size = res.end - res.start + 1;
info->map.bankwidth = *width;
info->map.virt = ioremap(info->map.phys, info->map.size);
if (info->map.virt == NULL) {
dev_err(&dev->dev, "Failed to ioremap flash region\n");
err = EIO;
goto err_out;
}
simple_map_init(&info->map);
of_probe = of_get_property(dp, "probe-type", NULL);
if (of_probe == NULL) {
probe_type = rom_probe_types;
for (; info->mtd == NULL && *probe_type != NULL; probe_type++)
info->mtd = do_map_probe(*probe_type, &info->map);
} else if (!strcmp(of_probe, "CFI"))
info->mtd = do_map_probe("cfi_probe", &info->map);
else if (!strcmp(of_probe, "JEDEC"))
info->mtd = do_map_probe("jedec_probe", &info->map);
else {
if (strcmp(of_probe, "ROM"))
dev_dbg(&dev->dev, "map_probe: don't know probe type "
"'%s', mapping as rom\n");
info->mtd = do_map_probe("mtd_rom", &info->map);
}
if (info->mtd == NULL) {
dev_err(&dev->dev, "map_probe failed\n");
err = -ENXIO;
goto err_out;
}
info->mtd->owner = THIS_MODULE;
#ifdef CONFIG_MTD_PARTITIONS
err = parse_mtd_partitions(info->mtd, part_probe_types, &info->parts, 0);
if (err > 0) {
add_mtd_partitions(info->mtd, info->parts, err);
} else if ((err = parse_flash_partitions(dp, &info->parts)) > 0) {
dev_info(&dev->dev, "Using OF partition information\n");
add_mtd_partitions(info->mtd, info->parts, err);
info->nr_parts = err;
} else
#endif
add_mtd_device(info->mtd);
return 0;
err_out:
of_physmap_remove(dev);
return err;
return 0;
}
static struct of_device_id of_physmap_match[] = {
{
.type = "rom",
.compatible = "direct-mapped"
},
{ },
};
MODULE_DEVICE_TABLE(of, of_physmap_match);
static struct of_platform_driver of_physmap_flash_driver = {
.name = "physmap-flash",
.match_table = of_physmap_match,
.probe = of_physmap_probe,
.remove = of_physmap_remove,
};
static int __init of_physmap_init(void)
{
return of_register_platform_driver(&of_physmap_flash_driver);
}
static void __exit of_physmap_exit(void)
{
of_unregister_platform_driver(&of_physmap_flash_driver);
}
module_init(of_physmap_init);
module_exit(of_physmap_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Vitaly Wool <vwool@ru.mvista.com>");
MODULE_DESCRIPTION("Configurable MTD map driver for OF");
