drivers/mtd/maps/integrator-flash.c - kernel/msm-4.9 - Gitiles

 /*======================================================================

     drivers/mtd/maps/integrator-flash.c: ARM Integrator flash map driver

     Copyright (C) 2000 ARM Limited
     Copyright (C) 2003 Deep Blue Solutions Ltd.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    This is access code for flashes using ARM's flash partitioning
    standards.

 ======================================================================*/

 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/ioport.h>
 #include <linux/platform_device.h>
 #include <linux/init.h>
 #include <linux/io.h>

 #include <linux/mtd/mtd.h>
 #include <linux/mtd/map.h>
 #include <linux/mtd/partitions.h>
 #include <linux/mtd/concat.h>

 #include <asm/mach/flash.h>
 #include <mach/hardware.h>
 #include <asm/system.h>

 #define SUBDEV_NAME_SIZE	(BUS_ID_SIZE + 2)

 struct armflash_subdev_info {
 	char			name[SUBDEV_NAME_SIZE];
 	struct mtd_info		*mtd;
 	struct map_info		map;
 	struct flash_platform_data *plat;
 };

 struct armflash_info {
 	struct resource		*res;
 	struct mtd_partition	*parts;
 	struct mtd_info		*mtd;
 	int			nr_subdev;
 	struct armflash_subdev_info subdev[0];
 };

 static void armflash_set_vpp(struct map_info *map, int on)
 {
 	struct armflash_subdev_info *info =
 		container_of(map, struct armflash_subdev_info, map);

 	if (info->plat && info->plat->set_vpp)
 		info->plat->set_vpp(on);
 }

 static const char *probes[] = { "cmdlinepart", "RedBoot", "afs", NULL };

 static int armflash_subdev_probe(struct armflash_subdev_info *subdev,
 				 struct resource *res)
 {
 	struct flash_platform_data *plat = subdev->plat;
 	resource_size_t size = res->end - res->start + 1;
 	void __iomem *base;
 	int err = 0;

 	if (!request_mem_region(res->start, size, subdev->name)) {
 		err = -EBUSY;
 		goto out;
 	}

 	base = ioremap(res->start, size);
 	if (!base) {
 		err = -ENOMEM;
 		goto no_mem;
 	}

 	/*
 	 * look for CFI based flash parts fitted to this board
 	 */
 	subdev->map.size	= size;
 	subdev->map.bankwidth	= plat->width;
 	subdev->map.phys	= res->start;
 	subdev->map.virt	= base;
 	subdev->map.name	= subdev->name;
 	subdev->map.set_vpp	= armflash_set_vpp;

 	simple_map_init(&subdev->map);

 	/*
 	 * Also, the CFI layer automatically works out what size
 	 * of chips we have, and does the necessary identification
 	 * for us automatically.
 	 */
 	subdev->mtd = do_map_probe(plat->map_name, &subdev->map);
 	if (!subdev->mtd) {
 		err = -ENXIO;
 		goto no_device;
 	}

 	subdev->mtd->owner = THIS_MODULE;

 	/* Successful? */
 	if (err == 0)
 		return err;

 	if (subdev->mtd)
 		map_destroy(subdev->mtd);
  no_device:
 	iounmap(base);
  no_mem:
 	release_mem_region(res->start, size);
  out:
 	return err;
 }

 static void armflash_subdev_remove(struct armflash_subdev_info *subdev)
 {
 	if (subdev->mtd)
 		map_destroy(subdev->mtd);
 	if (subdev->map.virt)
 		iounmap(subdev->map.virt);
 	release_mem_region(subdev->map.phys, subdev->map.size);
 }

 static int armflash_probe(struct platform_device *dev)
 {
 	struct flash_platform_data *plat = dev->dev.platform_data;
 	unsigned int size;
 	struct armflash_info *info;
 	int i, nr, err;

 	/* Count the number of devices */
 	for (nr = 0; ; nr++)
 		if (!platform_get_resource(dev, IORESOURCE_MEM, nr))
 			break;
 	if (nr == 0) {
 		err = -ENODEV;
 		goto out;
 	}

 	size = sizeof(struct armflash_info) +
 		sizeof(struct armflash_subdev_info) * nr;
 	info = kzalloc(size, GFP_KERNEL);
 	if (!info) {
 		err = -ENOMEM;
 		goto out;
 	}

 	if (plat && plat->init) {
 		err = plat->init();
 		if (err)
 			goto no_resource;
 	}

 	for (i = 0; i < nr; i++) {
 		struct armflash_subdev_info *subdev = &info->subdev[i];
 		struct resource *res;

 		res = platform_get_resource(dev, IORESOURCE_MEM, i);
 		if (!res)
 			break;

 		if (nr == 1)
 			/* No MTD concatenation, just use the default name */
 			snprintf(subdev->name, SUBDEV_NAME_SIZE, "%s",
 				 dev_name(&dev->dev));
 		else
 			snprintf(subdev->name, SUBDEV_NAME_SIZE, "%s-%d",
 				 dev_name(&dev->dev), i);
 		subdev->plat = plat;

 		err = armflash_subdev_probe(subdev, res);
 		if (err)
 			break;
 	}
 	info->nr_subdev = i;

 	if (err)
 		goto subdev_err;

 	if (info->nr_subdev == 1)
 		info->mtd = info->subdev[0].mtd;
 	else if (info->nr_subdev > 1) {
 #ifdef CONFIG_MTD_CONCAT
 		struct mtd_info *cdev[info->nr_subdev];

 		/*
 		 * We detected multiple devices.  Concatenate them together.
 		 */
 		for (i = 0; i < info->nr_subdev; i++)
 			cdev[i] = info->subdev[i].mtd;

 		info->mtd = mtd_concat_create(cdev, info->nr_subdev,
 					      dev_name(&dev->dev));
 		if (info->mtd == NULL)
 			err = -ENXIO;
 #else
 		printk(KERN_ERR "armflash: multiple devices found but "
 		       "MTD concat support disabled.\n");
 		err = -ENXIO;
 #endif
 	}

 	if (err < 0)
 		goto cleanup;

 	err = parse_mtd_partitions(info->mtd, probes, &info->parts, 0);
 	if (err > 0) {
 		err = add_mtd_partitions(info->mtd, info->parts, err);
 		if (err)
 			printk(KERN_ERR
 			       "mtd partition registration failed: %d\n", err);
 	}

 	if (err == 0) {
 		platform_set_drvdata(dev, info);
 		return err;
 	}

 	/*
 	 * We got an error, free all resources.
 	 */
  cleanup:
 	if (info->mtd) {
 		del_mtd_partitions(info->mtd);
 #ifdef CONFIG_MTD_CONCAT
 		if (info->mtd != info->subdev[0].mtd)
 			mtd_concat_destroy(info->mtd);
 #endif
 	}
 	kfree(info->parts);
  subdev_err:
 	for (i = info->nr_subdev - 1; i >= 0; i--)
 		armflash_subdev_remove(&info->subdev[i]);
  no_resource:
 	if (plat && plat->exit)
 		plat->exit();
 	kfree(info);
  out:
 	return err;
 }

 static int armflash_remove(struct platform_device *dev)
 {
 	struct armflash_info *info = platform_get_drvdata(dev);
 	struct flash_platform_data *plat = dev->dev.platform_data;
 	int i;

 	platform_set_drvdata(dev, NULL);

 	if (info) {
 		if (info->mtd) {
 			del_mtd_partitions(info->mtd);
 #ifdef CONFIG_MTD_CONCAT
 			if (info->mtd != info->subdev[0].mtd)
 				mtd_concat_destroy(info->mtd);
 #endif
 		}
 		kfree(info->parts);

 		for (i = info->nr_subdev - 1; i >= 0; i--)
 			armflash_subdev_remove(&info->subdev[i]);

 		if (plat && plat->exit)
 			plat->exit();

 		kfree(info);
 	}

 	return 0;
 }

 static struct platform_driver armflash_driver = {
 	.probe		= armflash_probe,
 	.remove		= armflash_remove,
 	.driver		= {
 		.name	= "armflash",
 		.owner	= THIS_MODULE,
 	},
 };

 static int __init armflash_init(void)
 {
 	return platform_driver_register(&armflash_driver);
 }

 static void __exit armflash_exit(void)
 {
 	platform_driver_unregister(&armflash_driver);
 }

 module_init(armflash_init);
 module_exit(armflash_exit);

 MODULE_AUTHOR("ARM Ltd");
 MODULE_DESCRIPTION("ARM Integrator CFI map driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:armflash");
	/*======================================================================

	drivers/mtd/maps/integrator-flash.c: ARM Integrator flash map driver

	Copyright (C) 2000 ARM Limited
	Copyright (C) 2003 Deep Blue Solutions Ltd.

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

	This is access code for flashes using ARM's flash partitioning
	standards.

	======================================================================*/

	#include <linux/module.h>
	#include <linux/types.h>
	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/ioport.h>
	#include <linux/platform_device.h>
	#include <linux/init.h>
	#include <linux/io.h>

	#include <linux/mtd/mtd.h>
	#include <linux/mtd/map.h>
	#include <linux/mtd/partitions.h>
	#include <linux/mtd/concat.h>

	#include <asm/mach/flash.h>
	#include <mach/hardware.h>
	#include <asm/system.h>

	#define SUBDEV_NAME_SIZE (BUS_ID_SIZE + 2)

	struct armflash_subdev_info {
	char name[SUBDEV_NAME_SIZE];
	struct mtd_info *mtd;
	struct map_info map;
	struct flash_platform_data *plat;
	};

	struct armflash_info {
	struct resource *res;
	struct mtd_partition *parts;
	struct mtd_info *mtd;
	int nr_subdev;
	struct armflash_subdev_info subdev[0];
	};

	static void armflash_set_vpp(struct map_info *map, int on)
	{
	struct armflash_subdev_info *info =
	container_of(map, struct armflash_subdev_info, map);

	if (info->plat && info->plat->set_vpp)
	info->plat->set_vpp(on);
	}

	static const char *probes[] = { "cmdlinepart", "RedBoot", "afs", NULL };

	static int armflash_subdev_probe(struct armflash_subdev_info *subdev,
	struct resource *res)
	{
	struct flash_platform_data *plat = subdev->plat;
	resource_size_t size = res->end - res->start + 1;
	void __iomem *base;
	int err = 0;

	if (!request_mem_region(res->start, size, subdev->name)) {
	err = -EBUSY;
	goto out;
	}

	base = ioremap(res->start, size);
	if (!base) {
	err = -ENOMEM;
	goto no_mem;
	}

	/*
	* look for CFI based flash parts fitted to this board
	*/
	subdev->map.size = size;
	subdev->map.bankwidth = plat->width;
	subdev->map.phys = res->start;
	subdev->map.virt = base;
	subdev->map.name = subdev->name;
	subdev->map.set_vpp = armflash_set_vpp;

	simple_map_init(&subdev->map);

	/*
	* Also, the CFI layer automatically works out what size
	* of chips we have, and does the necessary identification
	* for us automatically.
	*/
	subdev->mtd = do_map_probe(plat->map_name, &subdev->map);
	if (!subdev->mtd) {
	err = -ENXIO;
	goto no_device;
	}

	subdev->mtd->owner = THIS_MODULE;

	/* Successful? */
	if (err == 0)
	return err;

	if (subdev->mtd)
	map_destroy(subdev->mtd);
	no_device:
	iounmap(base);
	no_mem:
	release_mem_region(res->start, size);
	out:
	return err;
	}

	static void armflash_subdev_remove(struct armflash_subdev_info *subdev)
	{
	if (subdev->mtd)
	map_destroy(subdev->mtd);
	if (subdev->map.virt)
	iounmap(subdev->map.virt);
	release_mem_region(subdev->map.phys, subdev->map.size);
	}

	static int armflash_probe(struct platform_device *dev)
	{
	struct flash_platform_data *plat = dev->dev.platform_data;
	unsigned int size;
	struct armflash_info *info;
	int i, nr, err;

	/* Count the number of devices */
	for (nr = 0; ; nr++)
	if (!platform_get_resource(dev, IORESOURCE_MEM, nr))
	break;
	if (nr == 0) {
	err = -ENODEV;
	goto out;
	}

	size = sizeof(struct armflash_info) +
	sizeof(struct armflash_subdev_info) * nr;
	info = kzalloc(size, GFP_KERNEL);
	if (!info) {
	err = -ENOMEM;
	goto out;
	}

	if (plat && plat->init) {
	err = plat->init();
	if (err)
	goto no_resource;
	}

	for (i = 0; i < nr; i++) {
	struct armflash_subdev_info *subdev = &info->subdev[i];
	struct resource *res;

	res = platform_get_resource(dev, IORESOURCE_MEM, i);
	if (!res)
	break;

	if (nr == 1)
	/* No MTD concatenation, just use the default name */
	snprintf(subdev->name, SUBDEV_NAME_SIZE, "%s",
	dev_name(&dev->dev));
	else
	snprintf(subdev->name, SUBDEV_NAME_SIZE, "%s-%d",
	dev_name(&dev->dev), i);
	subdev->plat = plat;

	err = armflash_subdev_probe(subdev, res);
	if (err)
	break;
	}
	info->nr_subdev = i;

	if (err)
	goto subdev_err;

	if (info->nr_subdev == 1)
	info->mtd = info->subdev[0].mtd;
	else if (info->nr_subdev > 1) {
	#ifdef CONFIG_MTD_CONCAT
	struct mtd_info *cdev[info->nr_subdev];

	/*
	* We detected multiple devices. Concatenate them together.
	*/
	for (i = 0; i < info->nr_subdev; i++)
	cdev[i] = info->subdev[i].mtd;

	info->mtd = mtd_concat_create(cdev, info->nr_subdev,
	dev_name(&dev->dev));
	if (info->mtd == NULL)
	err = -ENXIO;
	#else
	printk(KERN_ERR "armflash: multiple devices found but "
	"MTD concat support disabled.\n");
	err = -ENXIO;
	#endif
	}

	if (err < 0)
	goto cleanup;

	err = parse_mtd_partitions(info->mtd, probes, &info->parts, 0);
	if (err > 0) {
	err = add_mtd_partitions(info->mtd, info->parts, err);
	if (err)
	printk(KERN_ERR
	"mtd partition registration failed: %d\n", err);
	}

	if (err == 0) {
	platform_set_drvdata(dev, info);
	return err;
	}

	/*
	* We got an error, free all resources.
	*/
	cleanup:
	if (info->mtd) {
	del_mtd_partitions(info->mtd);
	#ifdef CONFIG_MTD_CONCAT
	if (info->mtd != info->subdev[0].mtd)
	mtd_concat_destroy(info->mtd);
	#endif
	}
	kfree(info->parts);
	subdev_err:
	for (i = info->nr_subdev - 1; i >= 0; i--)
	armflash_subdev_remove(&info->subdev[i]);
	no_resource:
	if (plat && plat->exit)
	plat->exit();
	kfree(info);
	out:
	return err;
	}

	static int armflash_remove(struct platform_device *dev)
	{
	struct armflash_info *info = platform_get_drvdata(dev);
	struct flash_platform_data *plat = dev->dev.platform_data;
	int i;

	platform_set_drvdata(dev, NULL);

	if (info) {
	if (info->mtd) {
	del_mtd_partitions(info->mtd);
	#ifdef CONFIG_MTD_CONCAT
	if (info->mtd != info->subdev[0].mtd)
	mtd_concat_destroy(info->mtd);
	#endif
	}
	kfree(info->parts);

	for (i = info->nr_subdev - 1; i >= 0; i--)
	armflash_subdev_remove(&info->subdev[i]);

	if (plat && plat->exit)
	plat->exit();

	kfree(info);
	}

	return 0;
	}

	static struct platform_driver armflash_driver = {
	.probe = armflash_probe,
	.remove = armflash_remove,
	.driver = {
	.name = "armflash",
	.owner = THIS_MODULE,
	},
	};

	static int __init armflash_init(void)
	{
	return platform_driver_register(&armflash_driver);
	}

	static void __exit armflash_exit(void)
	{
	platform_driver_unregister(&armflash_driver);
	}

	module_init(armflash_init);
	module_exit(armflash_exit);

	MODULE_AUTHOR("ARM Ltd");
	MODULE_DESCRIPTION("ARM Integrator CFI map driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:armflash");