drivers/mtd/maps/physmap.c - kernel/quantenna - 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];
 	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;

 	info = platform_get_drvdata(dev);
 	if (info == NULL)
 		return 0;

 	physmap_data = dev_get_platdata(&dev->dev);

 	if (info->cmtd) {
 		mtd_device_unregister(info->cmtd);
 		if (info->cmtd != info->mtd[0])
 			mtd_concat_destroy(info->cmtd);
 	}

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

 	physmap_data = dev_get_platdata(&dev->dev);
 	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;
 	}

 	if (physmap_data->init) {
 		err = physmap_data->init(dev);
 		if (err)
 			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)resource_size(&dev->resource[i]),
 		       (unsigned long long)dev->resource[i].start);

 		if (!devm_request_mem_region(&dev->dev,
 			dev->resource[i].start,
 			resource_size(&dev->resource[i]),
 			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 = resource_size(&dev->resource[i]);
 		info->map[i].bankwidth = physmap_data->width;
 		info->map[i].set_vpp = physmap_set_vpp;
 		info->map[i].pfow_base = physmap_data->pfow_base;
 		info->map[i].map_priv_1 = (unsigned long)dev;

 		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;
 		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]);

 		if (info->mtd[i] == NULL) {
 			dev_err(&dev->dev, "map_probe failed\n");
 			err = -ENXIO;
 			goto err_out;
 		} else {
 			devices_found++;
 		}
 		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.
 		 */
 		info->cmtd = mtd_concat_create(info->mtd, devices_found, dev_name(&dev->dev));
 		if (info->cmtd == NULL)
 			err = -ENXIO;
 	}
 	if (err)
 		goto err_out;

 	spin_lock_init(&info->vpp_lock);

 	part_types = physmap_data->part_probe_types ? : part_probe_types;

 	mtd_device_parse_register(info->cmtd, part_types, NULL,
 				  physmap_data->parts, physmap_data->nr_parts);
 	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 (mtd_suspend(info->mtd[i]) == 0)
 			mtd_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",
 	},
 };


 #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
	/*
	* 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];
	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;

	info = platform_get_drvdata(dev);
	if (info == NULL)
	return 0;

	physmap_data = dev_get_platdata(&dev->dev);

	if (info->cmtd) {
	mtd_device_unregister(info->cmtd);
	if (info->cmtd != info->mtd[0])
	mtd_concat_destroy(info->cmtd);
	}

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

	physmap_data = dev_get_platdata(&dev->dev);
	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;
	}

	if (physmap_data->init) {
	err = physmap_data->init(dev);
	if (err)
	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)resource_size(&dev->resource[i]),
	(unsigned long long)dev->resource[i].start);

	if (!devm_request_mem_region(&dev->dev,
	dev->resource[i].start,
	resource_size(&dev->resource[i]),
	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 = resource_size(&dev->resource[i]);
	info->map[i].bankwidth = physmap_data->width;
	info->map[i].set_vpp = physmap_set_vpp;
	info->map[i].pfow_base = physmap_data->pfow_base;
	info->map[i].map_priv_1 = (unsigned long)dev;

	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;
	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]);

	if (info->mtd[i] == NULL) {
	dev_err(&dev->dev, "map_probe failed\n");
	err = -ENXIO;
	goto err_out;
	} else {
	devices_found++;
	}
	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.
	*/
	info->cmtd = mtd_concat_create(info->mtd, devices_found, dev_name(&dev->dev));
	if (info->cmtd == NULL)
	err = -ENXIO;
	}
	if (err)
	goto err_out;

	spin_lock_init(&info->vpp_lock);

	part_types = physmap_data->part_probe_types ? : part_probe_types;

	mtd_device_parse_register(info->cmtd, part_types, NULL,
	physmap_data->parts, physmap_data->nr_parts);
	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 (mtd_suspend(info->mtd[i]) == 0)
	mtd_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",
	},
	};


	#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