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android_kernel_xiaomi_sm8350/drivers/mtd/maps/physmap.c
Kay Sievers 41d867c9ac [MTD] [MAPS] fix platform driver hotplug/coldplug 
Since 43cc71eed1, the platform modalias is
prefixed with "platform:".  Add MODULE_ALIAS() to the hotpluggable MTD mapping
platform drivers, to re-enable auto loading.

NOTE oddness with physmap ...  it's a legacy driver in some configs, which
means it can't always support hotplugging.  (Not that most of these mapping
drivers would often be used as modules...)

[dbrownell@users.sourceforge.net: bugfix, more drivers, registration fixes]
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2008-04-22 14:14:26 +01:00

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7.8 KiB
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/*
* $Id: physmap.c,v 1.39 2005/11/29 14:49:36 gleixner Exp $
*
* Normal mappings of chips in physical memory
*
* Copyright (C) 2003 MontaVista Software Inc.
* Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
*
* 031022 - [jsun] add run-time configure and partition setup
*/
#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/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/physmap.h>
#include <linux/mtd/concat.h>
#include <asm/io.h>
#define MAX_RESOURCES 4
struct physmap_flash_info {
struct mtd_info *mtd[MAX_RESOURCES];
struct mtd_info *cmtd;
struct map_info map[MAX_RESOURCES];
struct resource *res;
#ifdef CONFIG_MTD_PARTITIONS
int nr_parts;
struct mtd_partition *parts;
#endif
};
static int physmap_flash_remove(struct platform_device *dev)
{
struct physmap_flash_info *info;
struct physmap_flash_data *physmap_data;
int i;
info = platform_get_drvdata(dev);
if (info == NULL)
return 0;
platform_set_drvdata(dev, NULL);
physmap_data = dev->dev.platform_data;
#ifdef CONFIG_MTD_CONCAT
if (info->cmtd != info->mtd[0]) {
del_mtd_device(info->cmtd);
mtd_concat_destroy(info->cmtd);
}
#endif
for (i = 0; i < MAX_RESOURCES; i++) {
if (info->mtd[i] != NULL) {
#ifdef CONFIG_MTD_PARTITIONS
if (info->nr_parts) {
del_mtd_partitions(info->mtd[i]);
kfree(info->parts);
} else if (physmap_data->nr_parts) {
del_mtd_partitions(info->mtd[i]);
} else {
del_mtd_device(info->mtd[i]);
}
#else
del_mtd_device(info->mtd[i]);
#endif
map_destroy(info->mtd[i]);
}
if (info->map[i].virt != NULL)
iounmap(info->map[i].virt);
}
if (info->res != NULL) {
release_resource(info->res);
kfree(info->res);
}
return 0;
}
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
static int physmap_flash_probe(struct platform_device *dev)
{
struct physmap_flash_data *physmap_data;
struct physmap_flash_info *info;
const char **probe_type;
int err = 0;
int i;
int devices_found = 0;
physmap_data = dev->dev.platform_data;
if (physmap_data == NULL)
return -ENODEV;
info = kzalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
if (info == NULL) {
err = -ENOMEM;
goto err_out;
}
platform_set_drvdata(dev, info);
for (i = 0; i < dev->num_resources; i++) {
printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
(unsigned long long)(dev->resource[i].end - dev->resource[i].start + 1),
(unsigned long long)dev->resource[i].start);
info->res = request_mem_region(dev->resource[i].start,
dev->resource[i].end - dev->resource[i].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;
}
info->map[i].name = dev->dev.bus_id;
info->map[i].phys = dev->resource[i].start;
info->map[i].size = dev->resource[i].end - dev->resource[i].start + 1;
info->map[i].bankwidth = physmap_data->width;
info->map[i].set_vpp = physmap_data->set_vpp;
info->map[i].virt = ioremap(info->map[i].phys, info->map[i].size);
if (info->map[i].virt == NULL) {
dev_err(&dev->dev, "Failed to ioremap flash region\n");
err = EIO;
goto err_out;
}
simple_map_init(&info->map[i]);
probe_type = rom_probe_types;
for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
if (info->mtd[i] == NULL) {
dev_err(&dev->dev, "map_probe failed\n");
err = -ENXIO;
goto err_out;
} else {
devices_found++;
}
info->mtd[i]->owner = THIS_MODULE;
}
if (devices_found == 1) {
info->cmtd = info->mtd[0];
} else if (devices_found > 1) {
/*
* We detected multiple devices. Concatenate them together.
*/
#ifdef CONFIG_MTD_CONCAT
info->cmtd = mtd_concat_create(info->mtd, devices_found, dev->dev.bus_id);
if (info->cmtd == NULL)
err = -ENXIO;
#else
printk(KERN_ERR "physmap-flash: multiple devices "
"found but MTD concat support disabled.\n");
err = -ENXIO;
#endif
}
if (err)
goto err_out;
#ifdef CONFIG_MTD_PARTITIONS
err = parse_mtd_partitions(info->cmtd, part_probe_types, &info->parts, 0);
if (err > 0) {
add_mtd_partitions(info->cmtd, info->parts, err);
return 0;
}
if (physmap_data->nr_parts) {
printk(KERN_NOTICE "Using physmap partition information\n");
add_mtd_partitions(info->cmtd, physmap_data->parts,
physmap_data->nr_parts);
return 0;
}
#endif
add_mtd_device(info->cmtd);
return 0;
err_out:
physmap_flash_remove(dev);
return err;
}
#ifdef CONFIG_PM
static int physmap_flash_suspend(struct platform_device *dev, pm_message_t state)
{
struct physmap_flash_info *info = platform_get_drvdata(dev);
int ret = 0;
int i;
for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
ret |= info->mtd[i]->suspend(info->mtd[i]);
return ret;
}
static int physmap_flash_resume(struct platform_device *dev)
{
struct physmap_flash_info *info = platform_get_drvdata(dev);
int i;
for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
info->mtd[i]->resume(info->mtd[i]);
return 0;
}
static void physmap_flash_shutdown(struct platform_device *dev)
{
struct physmap_flash_info *info = platform_get_drvdata(dev);
int i;
for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
if (info->mtd[i]->suspend(info->mtd[i]) == 0)
info->mtd[i]->resume(info->mtd[i]);
}
#else
#define physmap_flash_suspend NULL
#define physmap_flash_resume NULL
#define physmap_flash_shutdown NULL
#endif
static struct platform_driver physmap_flash_driver = {
.probe = physmap_flash_probe,
.remove = physmap_flash_remove,
.suspend = physmap_flash_suspend,
.resume = physmap_flash_resume,
.shutdown = physmap_flash_shutdown,
.driver = {
.name = "physmap-flash",
.owner = THIS_MODULE,
},
};
#ifdef CONFIG_MTD_PHYSMAP_LEN
#if CONFIG_MTD_PHYSMAP_LEN != 0
#warning using PHYSMAP compat code
#define PHYSMAP_COMPAT
#endif
#endif
#ifdef PHYSMAP_COMPAT
static struct physmap_flash_data physmap_flash_data = {
.width = CONFIG_MTD_PHYSMAP_BANKWIDTH,
};
static struct resource physmap_flash_resource = {
.start = CONFIG_MTD_PHYSMAP_START,
.end = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
.flags = IORESOURCE_MEM,
};
static struct platform_device physmap_flash = {
.name = "physmap-flash",
.id = 0,
.dev = {
.platform_data = &physmap_flash_data,
},
.num_resources = 1,
.resource = &physmap_flash_resource,
};
void physmap_configure(unsigned long addr, unsigned long size,
int bankwidth, void (*set_vpp)(struct map_info *, int))
{
physmap_flash_resource.start = addr;
physmap_flash_resource.end = addr + size - 1;
physmap_flash_data.width = bankwidth;
physmap_flash_data.set_vpp = set_vpp;
}
#ifdef CONFIG_MTD_PARTITIONS
void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
{
physmap_flash_data.nr_parts = num_parts;
physmap_flash_data.parts = parts;
}
#endif
#endif
static int __init physmap_init(void)
{
int err;
err = platform_driver_register(&physmap_flash_driver);
#ifdef PHYSMAP_COMPAT
if (err == 0)
platform_device_register(&physmap_flash);
#endif
return err;
}
static void __exit physmap_exit(void)
{
#ifdef PHYSMAP_COMPAT
platform_device_unregister(&physmap_flash);
#endif
platform_driver_unregister(&physmap_flash_driver);
}
module_init(physmap_init);
module_exit(physmap_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("Generic configurable MTD map driver");
/* legacy platform drivers can't hotplug or coldplg */
#ifndef PHYSMAP_COMPAT
/* work with hotplug and coldplug */
MODULE_ALIAS("platform:physmap-flash");
#endif
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