134 lines
3.0 KiB
C
134 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* rbtx4939-flash (based on physmap.c)
|
|
*
|
|
* This is a simplified physmap driver with map_init callback function.
|
|
*
|
|
* Copyright (C) 2009 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.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 <asm/txx9/rbtx4939.h>
|
|
|
|
struct rbtx4939_flash_info {
|
|
struct mtd_info *mtd;
|
|
struct map_info map;
|
|
};
|
|
|
|
static int rbtx4939_flash_remove(struct platform_device *dev)
|
|
{
|
|
struct rbtx4939_flash_info *info;
|
|
|
|
info = platform_get_drvdata(dev);
|
|
if (!info)
|
|
return 0;
|
|
|
|
if (info->mtd) {
|
|
mtd_device_unregister(info->mtd);
|
|
map_destroy(info->mtd);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const char * const rom_probe_types[] = {
|
|
"cfi_probe", "jedec_probe", NULL };
|
|
|
|
static int rbtx4939_flash_probe(struct platform_device *dev)
|
|
{
|
|
struct rbtx4939_flash_data *pdata;
|
|
struct rbtx4939_flash_info *info;
|
|
struct resource *res;
|
|
const char * const *probe_type;
|
|
int err = 0;
|
|
unsigned long size;
|
|
|
|
pdata = dev_get_platdata(&dev->dev);
|
|
if (!pdata)
|
|
return -ENODEV;
|
|
|
|
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
|
|
if (!res)
|
|
return -ENODEV;
|
|
info = devm_kzalloc(&dev->dev, sizeof(struct rbtx4939_flash_info),
|
|
GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(dev, info);
|
|
|
|
size = resource_size(res);
|
|
pr_notice("rbtx4939 platform flash device: %pR\n", res);
|
|
|
|
if (!devm_request_mem_region(&dev->dev, res->start, size,
|
|
dev_name(&dev->dev)))
|
|
return -EBUSY;
|
|
|
|
info->map.name = dev_name(&dev->dev);
|
|
info->map.phys = res->start;
|
|
info->map.size = size;
|
|
info->map.bankwidth = pdata->width;
|
|
|
|
info->map.virt = devm_ioremap(&dev->dev, info->map.phys, size);
|
|
if (!info->map.virt)
|
|
return -EBUSY;
|
|
|
|
if (pdata->map_init)
|
|
(*pdata->map_init)(&info->map);
|
|
else
|
|
simple_map_init(&info->map);
|
|
|
|
probe_type = rom_probe_types;
|
|
for (; !info->mtd && *probe_type; probe_type++)
|
|
info->mtd = do_map_probe(*probe_type, &info->map);
|
|
if (!info->mtd) {
|
|
dev_err(&dev->dev, "map_probe failed\n");
|
|
err = -ENXIO;
|
|
goto err_out;
|
|
}
|
|
info->mtd->dev.parent = &dev->dev;
|
|
err = mtd_device_register(info->mtd, pdata->parts, pdata->nr_parts);
|
|
|
|
if (err)
|
|
goto err_out;
|
|
return 0;
|
|
|
|
err_out:
|
|
rbtx4939_flash_remove(dev);
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static void rbtx4939_flash_shutdown(struct platform_device *dev)
|
|
{
|
|
struct rbtx4939_flash_info *info = platform_get_drvdata(dev);
|
|
|
|
if (mtd_suspend(info->mtd) == 0)
|
|
mtd_resume(info->mtd);
|
|
}
|
|
#else
|
|
#define rbtx4939_flash_shutdown NULL
|
|
#endif
|
|
|
|
static struct platform_driver rbtx4939_flash_driver = {
|
|
.probe = rbtx4939_flash_probe,
|
|
.remove = rbtx4939_flash_remove,
|
|
.shutdown = rbtx4939_flash_shutdown,
|
|
.driver = {
|
|
.name = "rbtx4939-flash",
|
|
},
|
|
};
|
|
|
|
module_platform_driver(rbtx4939_flash_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("RBTX4939 MTD map driver");
|
|
MODULE_ALIAS("platform:rbtx4939-flash");
|