2011-04-12 16:10:01 +00:00
|
|
|
/*
|
|
|
|
* 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.
|
|
|
|
*
|
|
|
|
* Copyright (C) 2004 Liu Peng Infineon IFAP DC COM CPE
|
|
|
|
* Copyright (C) 2010 John Crispin <blogic@openwrt.org>
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/types.h>
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/io.h>
|
|
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/mtd/mtd.h>
|
|
|
|
#include <linux/mtd/map.h>
|
|
|
|
#include <linux/mtd/partitions.h>
|
|
|
|
#include <linux/mtd/cfi.h>
|
|
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <linux/mtd/physmap.h>
|
|
|
|
|
|
|
|
#include <lantiq_soc.h>
|
|
|
|
#include <lantiq_platform.h>
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The NOR flash is connected to the same external bus unit (EBU) as PCI.
|
|
|
|
* To make PCI work we need to enable the endianness swapping for the address
|
|
|
|
* written to the EBU. This endianness swapping works for PCI correctly but
|
|
|
|
* fails for attached NOR devices. To workaround this we need to use a complex
|
|
|
|
* map. The workaround involves swapping all addresses whilst probing the chip.
|
|
|
|
* Once probing is complete we stop swapping the addresses but swizzle the
|
|
|
|
* unlock addresses to ensure that access to the NOR device works correctly.
|
|
|
|
*/
|
|
|
|
|
|
|
|
enum {
|
|
|
|
LTQ_NOR_PROBING,
|
|
|
|
LTQ_NOR_NORMAL
|
|
|
|
};
|
|
|
|
|
|
|
|
struct ltq_mtd {
|
|
|
|
struct resource *res;
|
|
|
|
struct mtd_info *mtd;
|
|
|
|
struct map_info *map;
|
|
|
|
};
|
|
|
|
|
|
|
|
static char ltq_map_name[] = "ltq_nor";
|
|
|
|
|
|
|
|
static map_word
|
|
|
|
ltq_read16(struct map_info *map, unsigned long adr)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
map_word temp;
|
|
|
|
|
|
|
|
if (map->map_priv_1 == LTQ_NOR_PROBING)
|
|
|
|
adr ^= 2;
|
|
|
|
spin_lock_irqsave(&ebu_lock, flags);
|
|
|
|
temp.x[0] = *(u16 *)(map->virt + adr);
|
|
|
|
spin_unlock_irqrestore(&ebu_lock, flags);
|
|
|
|
return temp;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
ltq_write16(struct map_info *map, map_word d, unsigned long adr)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
if (map->map_priv_1 == LTQ_NOR_PROBING)
|
|
|
|
adr ^= 2;
|
|
|
|
spin_lock_irqsave(&ebu_lock, flags);
|
|
|
|
*(u16 *)(map->virt + adr) = d.x[0];
|
|
|
|
spin_unlock_irqrestore(&ebu_lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The following 2 functions copy data between iomem and a cached memory
|
|
|
|
* section. As memcpy() makes use of pre-fetching we cannot use it here.
|
|
|
|
* The normal alternative of using memcpy_{to,from}io also makes use of
|
|
|
|
* memcpy() on MIPS so it is not applicable either. We are therefore stuck
|
|
|
|
* with having to use our own loop.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
ltq_copy_from(struct map_info *map, void *to,
|
|
|
|
unsigned long from, ssize_t len)
|
|
|
|
{
|
|
|
|
unsigned char *f = (unsigned char *)map->virt + from;
|
|
|
|
unsigned char *t = (unsigned char *)to;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&ebu_lock, flags);
|
|
|
|
while (len--)
|
|
|
|
*t++ = *f++;
|
|
|
|
spin_unlock_irqrestore(&ebu_lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
ltq_copy_to(struct map_info *map, unsigned long to,
|
|
|
|
const void *from, ssize_t len)
|
|
|
|
{
|
|
|
|
unsigned char *f = (unsigned char *)from;
|
|
|
|
unsigned char *t = (unsigned char *)map->virt + to;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&ebu_lock, flags);
|
|
|
|
while (len--)
|
|
|
|
*t++ = *f++;
|
|
|
|
spin_unlock_irqrestore(&ebu_lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static const char const *part_probe_types[] = { "cmdlinepart", NULL };
|
|
|
|
|
|
|
|
static int __init
|
|
|
|
ltq_mtd_probe(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct physmap_flash_data *ltq_mtd_data = dev_get_platdata(&pdev->dev);
|
|
|
|
struct ltq_mtd *ltq_mtd;
|
|
|
|
struct mtd_partition *parts;
|
|
|
|
struct resource *res;
|
|
|
|
int nr_parts = 0;
|
|
|
|
struct cfi_private *cfi;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
ltq_mtd = kzalloc(sizeof(struct ltq_mtd), GFP_KERNEL);
|
|
|
|
platform_set_drvdata(pdev, ltq_mtd);
|
|
|
|
|
|
|
|
ltq_mtd->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
|
if (!ltq_mtd->res) {
|
|
|
|
dev_err(&pdev->dev, "failed to get memory resource");
|
|
|
|
err = -ENOENT;
|
|
|
|
goto err_out;
|
|
|
|
}
|
|
|
|
|
|
|
|
res = devm_request_mem_region(&pdev->dev, ltq_mtd->res->start,
|
|
|
|
resource_size(ltq_mtd->res), dev_name(&pdev->dev));
|
|
|
|
if (!ltq_mtd->res) {
|
|
|
|
dev_err(&pdev->dev, "failed to request mem resource");
|
|
|
|
err = -EBUSY;
|
|
|
|
goto err_out;
|
|
|
|
}
|
|
|
|
|
|
|
|
ltq_mtd->map = kzalloc(sizeof(struct map_info), GFP_KERNEL);
|
|
|
|
ltq_mtd->map->phys = res->start;
|
|
|
|
ltq_mtd->map->size = resource_size(res);
|
|
|
|
ltq_mtd->map->virt = devm_ioremap_nocache(&pdev->dev,
|
|
|
|
ltq_mtd->map->phys, ltq_mtd->map->size);
|
|
|
|
if (!ltq_mtd->map->virt) {
|
|
|
|
dev_err(&pdev->dev, "failed to ioremap!\n");
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto err_free;
|
|
|
|
}
|
|
|
|
|
|
|
|
ltq_mtd->map->name = ltq_map_name;
|
|
|
|
ltq_mtd->map->bankwidth = 2;
|
|
|
|
ltq_mtd->map->read = ltq_read16;
|
|
|
|
ltq_mtd->map->write = ltq_write16;
|
|
|
|
ltq_mtd->map->copy_from = ltq_copy_from;
|
|
|
|
ltq_mtd->map->copy_to = ltq_copy_to;
|
|
|
|
|
|
|
|
ltq_mtd->map->map_priv_1 = LTQ_NOR_PROBING;
|
|
|
|
ltq_mtd->mtd = do_map_probe("cfi_probe", ltq_mtd->map);
|
|
|
|
ltq_mtd->map->map_priv_1 = LTQ_NOR_NORMAL;
|
|
|
|
|
|
|
|
if (!ltq_mtd->mtd) {
|
|
|
|
dev_err(&pdev->dev, "probing failed\n");
|
|
|
|
err = -ENXIO;
|
|
|
|
goto err_unmap;
|
|
|
|
}
|
|
|
|
|
|
|
|
ltq_mtd->mtd->owner = THIS_MODULE;
|
|
|
|
|
|
|
|
cfi = ltq_mtd->map->fldrv_priv;
|
|
|
|
cfi->addr_unlock1 ^= 1;
|
|
|
|
cfi->addr_unlock2 ^= 1;
|
|
|
|
|
|
|
|
nr_parts = parse_mtd_partitions(ltq_mtd->mtd,
|
|
|
|
part_probe_types, &parts, 0);
|
|
|
|
if (nr_parts > 0) {
|
|
|
|
dev_info(&pdev->dev,
|
|
|
|
"using %d partitions from cmdline", nr_parts);
|
|
|
|
} else {
|
|
|
|
nr_parts = ltq_mtd_data->nr_parts;
|
|
|
|
parts = ltq_mtd_data->parts;
|
|
|
|
}
|
|
|
|
|
2011-06-09 17:57:33 +00:00
|
|
|
err = mtd_device_register(ltq_mtd->mtd, parts, nr_parts);
|
2011-04-12 16:10:01 +00:00
|
|
|
if (err) {
|
|
|
|
dev_err(&pdev->dev, "failed to add partitions\n");
|
|
|
|
goto err_destroy;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
err_destroy:
|
|
|
|
map_destroy(ltq_mtd->mtd);
|
|
|
|
err_unmap:
|
|
|
|
iounmap(ltq_mtd->map->virt);
|
|
|
|
err_free:
|
|
|
|
kfree(ltq_mtd->map);
|
|
|
|
err_out:
|
|
|
|
kfree(ltq_mtd);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __devexit
|
|
|
|
ltq_mtd_remove(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct ltq_mtd *ltq_mtd = platform_get_drvdata(pdev);
|
|
|
|
|
|
|
|
if (ltq_mtd) {
|
|
|
|
if (ltq_mtd->mtd) {
|
2011-06-09 17:57:33 +00:00
|
|
|
mtd_device_unregister(ltq_mtd->mtd);
|
2011-04-12 16:10:01 +00:00
|
|
|
map_destroy(ltq_mtd->mtd);
|
|
|
|
}
|
|
|
|
if (ltq_mtd->map->virt)
|
|
|
|
iounmap(ltq_mtd->map->virt);
|
|
|
|
kfree(ltq_mtd->map);
|
|
|
|
kfree(ltq_mtd);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct platform_driver ltq_mtd_driver = {
|
|
|
|
.remove = __devexit_p(ltq_mtd_remove),
|
|
|
|
.driver = {
|
|
|
|
.name = "ltq_nor",
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init
|
|
|
|
init_ltq_mtd(void)
|
|
|
|
{
|
|
|
|
int ret = platform_driver_probe(<q_mtd_driver, ltq_mtd_probe);
|
|
|
|
|
|
|
|
if (ret)
|
|
|
|
pr_err("ltq_nor: error registering platform driver");
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit
|
|
|
|
exit_ltq_mtd(void)
|
|
|
|
{
|
|
|
|
platform_driver_unregister(<q_mtd_driver);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(init_ltq_mtd);
|
|
|
|
module_exit(exit_ltq_mtd);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
|
|
|
|
MODULE_DESCRIPTION("Lantiq SoC NOR");
|