physmap.c 7.0 KB
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/*
 * 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>
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#include <linux/device.h>
#include <linux/platform_device.h>
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#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
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#include <linux/mtd/physmap.h>
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#include <linux/mtd/concat.h>
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#include <linux/io.h>
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#define MAX_RESOURCES		4

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struct physmap_flash_info {
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	struct mtd_info		*mtd[MAX_RESOURCES];
	struct mtd_info		*cmtd;
	struct map_info		map[MAX_RESOURCES];
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#ifdef CONFIG_MTD_PARTITIONS
	int			nr_parts;
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	struct mtd_partition	*parts;
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#endif
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};

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static int physmap_flash_remove(struct platform_device *dev)
{
	struct physmap_flash_info *info;
	struct physmap_flash_data *physmap_data;
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	int i;
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	info = platform_get_drvdata(dev);
	if (info == NULL)
		return 0;
	platform_set_drvdata(dev, NULL);

	physmap_data = dev->dev.platform_data;

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	if (info->cmtd) {
#ifdef CONFIG_MTD_PARTITIONS
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		if (info->nr_parts || physmap_data->nr_parts) {
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			del_mtd_partitions(info->cmtd);
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			if (info->nr_parts)
				kfree(info->parts);
		} else {
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			del_mtd_device(info->cmtd);
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		}
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#else
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		del_mtd_device(info->cmtd);
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#endif
		if (info->cmtd != info->mtd[0])
			mtd_concat_destroy(info->cmtd);
	}
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	for (i = 0; i < MAX_RESOURCES; i++) {
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		if (info->mtd[i] != NULL)
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			map_destroy(info->mtd[i]);
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	}
	return 0;
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}

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static const char *rom_probe_types[] = {
					"cfi_probe",
					"jedec_probe",
					"qinfo_probe",
					"map_rom",
					NULL };
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#ifdef CONFIG_MTD_PARTITIONS
static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
#endif

static int physmap_flash_probe(struct platform_device *dev)
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{
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	struct physmap_flash_data *physmap_data;
	struct physmap_flash_info *info;
	const char **probe_type;
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	int err = 0;
	int i;
	int devices_found = 0;
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	physmap_data = dev->dev.platform_data;
	if (physmap_data == NULL)
		return -ENODEV;

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	info = devm_kzalloc(&dev->dev, sizeof(struct physmap_flash_info),
			    GFP_KERNEL);
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	if (info == NULL) {
		err = -ENOMEM;
		goto err_out;
	}
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	platform_set_drvdata(dev, info);
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	for (i = 0; i < dev->num_resources; i++) {
		printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
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		       (unsigned long long)resource_size(&dev->resource[i]),
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		       (unsigned long long)dev->resource[i].start);

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		if (!devm_request_mem_region(&dev->dev,
			dev->resource[i].start,
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			resource_size(&dev->resource[i]),
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			dev_name(&dev->dev))) {
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			dev_err(&dev->dev, "Could not reserve memory region\n");
			err = -ENOMEM;
			goto err_out;
		}
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		info->map[i].name = dev_name(&dev->dev);
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		info->map[i].phys = dev->resource[i].start;
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		info->map[i].size = resource_size(&dev->resource[i]);
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		info->map[i].bankwidth = physmap_data->width;
		info->map[i].set_vpp = physmap_data->set_vpp;
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		info->map[i].pfow_base = physmap_data->pfow_base;
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		info->map[i].virt = devm_ioremap(&dev->dev, info->map[i].phys,
						 info->map[i].size);
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		if (info->map[i].virt == NULL) {
			dev_err(&dev->dev, "Failed to ioremap flash region\n");
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			err = -EIO;
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			goto err_out;
		}
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		simple_map_init(&info->map[i]);
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		probe_type = rom_probe_types;
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		if (physmap_data->probe_type == NULL) {
			for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
				info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
		} else
			info->mtd[i] = do_map_probe(physmap_data->probe_type, &info->map[i]);

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		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;
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		info->mtd[i]->dev.parent = &dev->dev;
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	}
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	if (devices_found == 1) {
		info->cmtd = info->mtd[0];
	} else if (devices_found > 1) {
		/*
		 * We detected multiple devices. Concatenate them together.
		 */
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		info->cmtd = mtd_concat_create(info->mtd, devices_found, dev_name(&dev->dev));
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		if (info->cmtd == NULL)
			err = -ENXIO;
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	}
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	if (err)
		goto err_out;
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#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);
		info->nr_parts = err;
		return 0;
	}
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	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;
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	}
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#endif
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	add_mtd_device(info->cmtd);
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	return 0;

err_out:
	physmap_flash_remove(dev);
	return err;
}

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#ifdef CONFIG_PM
static void physmap_flash_shutdown(struct platform_device *dev)
{
	struct physmap_flash_info *info = platform_get_drvdata(dev);
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	int i;

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	for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
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		if (info->mtd[i]->suspend && info->mtd[i]->resume)
			if (info->mtd[i]->suspend(info->mtd[i]) == 0)
				info->mtd[i]->resume(info->mtd[i]);
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}
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#else
#define physmap_flash_shutdown NULL
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#endif

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static struct platform_driver physmap_flash_driver = {
	.probe		= physmap_flash_probe,
	.remove		= physmap_flash_remove,
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	.shutdown	= physmap_flash_shutdown,
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	.driver		= {
		.name	= "physmap-flash",
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		.owner	= THIS_MODULE,
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	},
};
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#ifdef CONFIG_MTD_PHYSMAP_COMPAT
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static struct physmap_flash_data physmap_flash_data = {
	.width		= CONFIG_MTD_PHYSMAP_BANKWIDTH,
};
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static struct resource physmap_flash_resource = {
	.start		= CONFIG_MTD_PHYSMAP_START,
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	.end		= CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
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	.flags		= IORESOURCE_MEM,
};
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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))
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{
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	physmap_flash_resource.start = addr;
	physmap_flash_resource.end = addr + size - 1;
	physmap_flash_data.width = bankwidth;
	physmap_flash_data.set_vpp = set_vpp;
}

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#ifdef CONFIG_MTD_PARTITIONS
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void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
{
	physmap_flash_data.nr_parts = num_parts;
	physmap_flash_data.parts = parts;
}
#endif
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#endif

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static int __init physmap_init(void)
{
	int err;

	err = platform_driver_register(&physmap_flash_driver);
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	if (err == 0) {
		err = platform_device_register(&physmap_flash);
		if (err)
			platform_driver_unregister(&physmap_flash_driver);
	}
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#endif

	return err;
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}

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static void __exit physmap_exit(void)
{
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#ifdef CONFIG_MTD_PHYSMAP_COMPAT
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	platform_device_unregister(&physmap_flash);
#endif
	platform_driver_unregister(&physmap_flash_driver);
}
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module_init(physmap_init);
module_exit(physmap_exit);
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MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("Generic configurable MTD map driver");
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/* legacy platform drivers can't hotplug or coldplg */
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#ifndef CONFIG_MTD_PHYSMAP_COMPAT
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/* work with hotplug and coldplug */
MODULE_ALIAS("platform:physmap-flash");
#endif