mirror of https://gitee.com/openkylin/linux.git
145 lines
3.5 KiB
C
145 lines
3.5 KiB
C
/*
|
|
* Map driver for Intel XScale PXA2xx platforms.
|
|
*
|
|
* Author: Nicolas Pitre
|
|
* Copyright: (C) 2001 MontaVista Software Inc.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/map.h>
|
|
#include <linux/mtd/partitions.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <mach/hardware.h>
|
|
|
|
#include <asm/mach/flash.h>
|
|
|
|
#define CACHELINESIZE 32
|
|
|
|
static void pxa2xx_map_inval_cache(struct map_info *map, unsigned long from,
|
|
ssize_t len)
|
|
{
|
|
unsigned long start = (unsigned long)map->cached + from;
|
|
unsigned long end = start + len;
|
|
|
|
start &= ~(CACHELINESIZE - 1);
|
|
while (start < end) {
|
|
/* invalidate D cache line */
|
|
asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start));
|
|
start += CACHELINESIZE;
|
|
}
|
|
}
|
|
|
|
struct pxa2xx_flash_info {
|
|
struct mtd_info *mtd;
|
|
struct map_info map;
|
|
};
|
|
|
|
static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
|
|
|
|
static int pxa2xx_flash_probe(struct platform_device *pdev)
|
|
{
|
|
struct flash_platform_data *flash = dev_get_platdata(&pdev->dev);
|
|
struct pxa2xx_flash_info *info;
|
|
struct resource *res;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res)
|
|
return -ENODEV;
|
|
|
|
info = kzalloc(sizeof(struct pxa2xx_flash_info), GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
info->map.name = flash->name;
|
|
info->map.bankwidth = flash->width;
|
|
info->map.phys = res->start;
|
|
info->map.size = resource_size(res);
|
|
|
|
info->map.virt = ioremap(info->map.phys, info->map.size);
|
|
if (!info->map.virt) {
|
|
printk(KERN_WARNING "Failed to ioremap %s\n",
|
|
info->map.name);
|
|
return -ENOMEM;
|
|
}
|
|
info->map.cached =
|
|
ioremap_cache(info->map.phys, info->map.size);
|
|
if (!info->map.cached)
|
|
printk(KERN_WARNING "Failed to ioremap cached %s\n",
|
|
info->map.name);
|
|
info->map.inval_cache = pxa2xx_map_inval_cache;
|
|
simple_map_init(&info->map);
|
|
|
|
printk(KERN_NOTICE
|
|
"Probing %s at physical address 0x%08lx"
|
|
" (%d-bit bankwidth)\n",
|
|
info->map.name, (unsigned long)info->map.phys,
|
|
info->map.bankwidth * 8);
|
|
|
|
info->mtd = do_map_probe(flash->map_name, &info->map);
|
|
|
|
if (!info->mtd) {
|
|
iounmap((void *)info->map.virt);
|
|
if (info->map.cached)
|
|
iounmap(info->map.cached);
|
|
return -EIO;
|
|
}
|
|
info->mtd->owner = THIS_MODULE;
|
|
|
|
mtd_device_parse_register(info->mtd, probes, NULL, flash->parts,
|
|
flash->nr_parts);
|
|
|
|
platform_set_drvdata(pdev, info);
|
|
return 0;
|
|
}
|
|
|
|
static int pxa2xx_flash_remove(struct platform_device *dev)
|
|
{
|
|
struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
|
|
|
|
mtd_device_unregister(info->mtd);
|
|
|
|
map_destroy(info->mtd);
|
|
iounmap(info->map.virt);
|
|
if (info->map.cached)
|
|
iounmap(info->map.cached);
|
|
kfree(info);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static void pxa2xx_flash_shutdown(struct platform_device *dev)
|
|
{
|
|
struct pxa2xx_flash_info *info = platform_get_drvdata(dev);
|
|
|
|
if (info && mtd_suspend(info->mtd) == 0)
|
|
mtd_resume(info->mtd);
|
|
}
|
|
#else
|
|
#define pxa2xx_flash_shutdown NULL
|
|
#endif
|
|
|
|
static struct platform_driver pxa2xx_flash_driver = {
|
|
.driver = {
|
|
.name = "pxa2xx-flash",
|
|
},
|
|
.probe = pxa2xx_flash_probe,
|
|
.remove = pxa2xx_flash_remove,
|
|
.shutdown = pxa2xx_flash_shutdown,
|
|
};
|
|
|
|
module_platform_driver(pxa2xx_flash_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net>");
|
|
MODULE_DESCRIPTION("MTD map driver for Intel XScale PXA2xx");
|