drivers/mtd/maps/physmap.c - kernel/prism - Git at Google

 /*
  * 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>

 #define MAX_RESOURCES		4

 struct physmap_flash_info {
 	struct mtd_info		*mtd[MAX_RESOURCES];
 	struct mtd_info		*cmtd;
 	struct map_info		map[MAX_RESOURCES];
 #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;

 	if (info->cmtd) {
 #ifdef CONFIG_MTD_PARTITIONS
 		if (info->nr_parts || physmap_data->nr_parts)
 			del_mtd_partitions(info->cmtd);
 		else
 			del_mtd_device(info->cmtd);
 #else
 		del_mtd_device(info->cmtd);
 #endif
 	}
 #ifdef CONFIG_MTD_PARTITIONS
 	if (info->nr_parts)
 		kfree(info->parts);
 #endif

 #ifdef CONFIG_MTD_CONCAT
 	if (info->cmtd != info->mtd[0])
 		mtd_concat_destroy(info->cmtd);
 #endif

 	for (i = 0; i < MAX_RESOURCES; i++) {
 		if (info->mtd[i] != NULL)
 			map_destroy(info->mtd[i]);
 	}
 	return 0;
 }

 static const char *rom_probe_types[] = {
 					"cfi_probe",
 					"jedec_probe",
 					"qinfo_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 = devm_kzalloc(&dev->dev, 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);

 		if (!devm_request_mem_region(&dev->dev,
 			dev->resource[i].start,
 			dev->resource[i].end - dev->resource[i].start + 1,
 			dev_name(&dev->dev))) {
 			dev_err(&dev->dev, "Could not reserve memory region\n");
 			err = -ENOMEM;
 			goto err_out;
 		}

 		info->map[i].name = dev_name(&dev->dev);
 		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].pfow_base = physmap_data->pfow_base;

 		info->map[i].virt = devm_ioremap(&dev->dev, 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;
 		info->mtd[i]->dev.parent = &dev->dev;
 	}

 	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_name(&dev->dev));
 		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);
 		info->nr_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 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]->resume)
 			if (info->mtd[i]->suspend(info->mtd[i]) == 0)
 				info->mtd[i]->resume(info->mtd[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",
 		.owner	= THIS_MODULE,
 	},
 };


 #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,
 };

 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 CONFIG_MTD_PHYSMAP_COMPAT
 	if (err == 0)
 		platform_device_register(&physmap_flash);
 #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
	/*
	* 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>

	#define MAX_RESOURCES 4

	struct physmap_flash_info {
	struct mtd_info *mtd[MAX_RESOURCES];
	struct mtd_info *cmtd;
	struct map_info map[MAX_RESOURCES];
	#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;

	if (info->cmtd) {
	#ifdef CONFIG_MTD_PARTITIONS
	if (info->nr_parts \|\| physmap_data->nr_parts)
	del_mtd_partitions(info->cmtd);
	else
	del_mtd_device(info->cmtd);
	#else
	del_mtd_device(info->cmtd);
	#endif
	}
	#ifdef CONFIG_MTD_PARTITIONS
	if (info->nr_parts)
	kfree(info->parts);
	#endif

	#ifdef CONFIG_MTD_CONCAT
	if (info->cmtd != info->mtd[0])
	mtd_concat_destroy(info->cmtd);
	#endif

	for (i = 0; i < MAX_RESOURCES; i++) {
	if (info->mtd[i] != NULL)
	map_destroy(info->mtd[i]);
	}
	return 0;
	}

	static const char *rom_probe_types[] = {
	"cfi_probe",
	"jedec_probe",
	"qinfo_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 = devm_kzalloc(&dev->dev, 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);

	if (!devm_request_mem_region(&dev->dev,
	dev->resource[i].start,
	dev->resource[i].end - dev->resource[i].start + 1,
	dev_name(&dev->dev))) {
	dev_err(&dev->dev, "Could not reserve memory region\n");
	err = -ENOMEM;
	goto err_out;
	}

	info->map[i].name = dev_name(&dev->dev);
	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].pfow_base = physmap_data->pfow_base;

	info->map[i].virt = devm_ioremap(&dev->dev, 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;
	info->mtd[i]->dev.parent = &dev->dev;
	}

	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_name(&dev->dev));
	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);
	info->nr_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 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]->resume)
	if (info->mtd[i]->suspend(info->mtd[i]) == 0)
	info->mtd[i]->resume(info->mtd[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",
	.owner = THIS_MODULE,
	},
	};


	#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,
	};

	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 CONFIG_MTD_PHYSMAP_COMPAT
	if (err == 0)
	platform_device_register(&physmap_flash);
	#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