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// SPDX-License-Identifier: GPL-2.0+
/*
* 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 <linux/io.h>
struct physmap_flash_info {
unsigned int nmaps;
struct mtd_info **mtds;
struct mtd_info *cmtd;
struct map_info *maps;
spinlock_t vpp_lock;
int vpp_refcnt;
};
static int physmap_flash_remove(struct platform_device *dev)
{
struct physmap_flash_info *info;
struct physmap_flash_data *physmap_data;
int i, err;
info = platform_get_drvdata(dev);
if (!info)
return 0;
physmap_data = dev_get_platdata(&dev->dev);
if (info->cmtd) {
err = mtd_device_unregister(info->cmtd);
if (err)
return err;
if (info->cmtd != info->mtds[0])
mtd_concat_destroy(info->cmtd);
}
for (i = 0; i < info->nmaps; i++) {
if (info->mtds[i])
map_destroy(info->mtds[i]);
}
if (physmap_data->exit)
physmap_data->exit(dev);
return 0;
}
static void physmap_set_vpp(struct map_info *map, int state)
{
struct platform_device *pdev;
struct physmap_flash_data *physmap_data;
struct physmap_flash_info *info;
unsigned long flags;
pdev = (struct platform_device *)map->map_priv_1;
physmap_data = dev_get_platdata(&pdev->dev);
if (!physmap_data->set_vpp)
return;
info = platform_get_drvdata(pdev);
spin_lock_irqsave(&info->vpp_lock, flags);
if (state) {
if (++info->vpp_refcnt == 1) /* first nested 'on' */
physmap_data->set_vpp(pdev, 1);
} else {
if (--info->vpp_refcnt == 0) /* last nested 'off' */
physmap_data->set_vpp(pdev, 0);
}
spin_unlock_irqrestore(&info->vpp_lock, flags);
}
static const char * const rom_probe_types[] = {
"cfi_probe", "jedec_probe", "qinfo_probe", "map_rom", NULL
};
static const char * const part_probe_types[] = {
"cmdlinepart", "RedBoot", "afs", NULL
};
static int physmap_flash_probe(struct platform_device *dev)
{
struct physmap_flash_data *physmap_data;
struct physmap_flash_info *info;
const char * const *probe_type;
const char * const *part_types;
int err = 0;
int i;
physmap_data = dev_get_platdata(&dev->dev);
if (!physmap_data)
return -ENODEV;
info = devm_kzalloc(&dev->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
while (platform_get_resource(dev, IORESOURCE_MEM, info->nmaps))
info->nmaps++;
if (!info->nmaps)
return -ENODEV;
info->maps = devm_kzalloc(&dev->dev,
sizeof(*info->maps) * info->nmaps,
GFP_KERNEL);
if (!info->maps)
return -ENOMEM;
info->mtds = devm_kzalloc(&dev->dev,
sizeof(*info->mtds) * info->nmaps,
GFP_KERNEL);
if (!info->mtds)
return -ENOMEM;
if (physmap_data->init) {
err = physmap_data->init(dev);
if (err)
goto err_out;
}
platform_set_drvdata(dev, info);
for (i = 0; i < info->nmaps; i++) {
struct resource *res;
res = platform_get_resource(dev, IORESOURCE_MEM, i);
info->maps[i].virt = devm_ioremap_resource(&dev->dev, res);
if (IS_ERR(info->maps[i].virt)) {
err = PTR_ERR(info->maps[i].virt);
goto err_out;
}
dev_notice(&dev->dev, "physmap platform flash device: %pR\n",
res);
info->maps[i].name = dev_name(&dev->dev);
info->maps[i].phys = res->start;
info->maps[i].size = resource_size(res);
info->maps[i].bankwidth = physmap_data->width;
info->maps[i].set_vpp = physmap_set_vpp;
info->maps[i].pfow_base = physmap_data->pfow_base;
info->maps[i].map_priv_1 = (unsigned long)dev;
simple_map_init(&info->maps[i]);
probe_type = rom_probe_types;
if (!physmap_data->probe_type) {
for (; !info->mtds[i] && *probe_type; probe_type++)
info->mtds[i] = do_map_probe(*probe_type,
&info->maps[i]);
} else {
info->mtds[i] = do_map_probe(physmap_data->probe_type,
&info->maps[i]);
}
if (!info->mtds[i]) {
dev_err(&dev->dev, "map_probe failed\n");
err = -ENXIO;
goto err_out;
}
info->mtds[i]->dev.parent = &dev->dev;
}
if (info->nmaps == 1) {
info->cmtd = info->mtds[0];
} else {
/*
* We detected multiple devices. Concatenate them together.
*/
info->cmtd = mtd_concat_create(info->mtds, info->nmaps,
dev_name(&dev->dev));
if (!info->cmtd)
err = -ENXIO;
}
if (err)
goto err_out;
spin_lock_init(&info->vpp_lock);
part_types = physmap_data->part_probe_types ? : part_probe_types;
err = mtd_device_parse_register(info->cmtd, part_types, NULL,
physmap_data->parts,
physmap_data->nr_parts);
if (err)
goto err_out;
return 0;
err_out:
physmap_flash_remove(dev);
return err;
}
#ifdef CONFIG_PM
static void physmap_flash_shutdown(struct platform_device *dev)
{
struct physmap_flash_info *info = platform_get_drvdata(dev);
int i;
for (i = 0; i < info->nmaps && info->mtds[i]; i++)
if (mtd_suspend(info->mtds[i]) == 0)
mtd_resume(info->mtds[i]);
}
#else
#define physmap_flash_shutdown NULL
#endif
static struct platform_driver physmap_flash_driver = {
.probe = physmap_flash_probe,
.remove = physmap_flash_remove,
.shutdown = physmap_flash_shutdown,
.driver = {
.name = "physmap-flash",
},
};
#ifdef CONFIG_MTD_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,
};
#endif
static int __init physmap_init(void)
{
int err;
err = platform_driver_register(&physmap_flash_driver);
#ifdef CONFIG_MTD_PHYSMAP_COMPAT
if (err == 0) {
err = platform_device_register(&physmap_flash);
if (err)
platform_driver_unregister(&physmap_flash_driver);
}
#endif
return err;
}
static void __exit physmap_exit(void)
{
#ifdef CONFIG_MTD_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 CONFIG_MTD_PHYSMAP_COMPAT
/* work with hotplug and coldplug */
MODULE_ALIAS("platform:physmap-flash");
#endif
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