drivers/mtd/maps/ixp2000.c - kernel/msm - Gitiles

 /*
  * $Id: ixp2000.c,v 1.6 2005/03/18 14:07:46 gleixner Exp $
  *
  * drivers/mtd/maps/ixp2000.c
  *
  * Mapping for the Intel XScale IXP2000 based systems
  *
  * Copyright (C) 2002 Intel Corp.
  * Copyright (C) 2003-2004 MontaVista Software, Inc.
  *
  * Original Author: Naeem M Afzal <naeem.m.afzal@intel.com>
  * Maintainer: Deepak Saxena <dsaxena@plexity.net>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  */

 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/ioport.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 <asm/io.h>
 #include <asm/hardware.h>
 #include <asm/mach/flash.h>

 #include <linux/reboot.h>

 struct ixp2000_flash_info {
 	struct		mtd_info *mtd;
 	struct		map_info map;
 	struct		mtd_partition *partitions;
 	struct		resource *res;
 	int		nr_banks;
 };

 static inline unsigned long flash_bank_setup(struct map_info *map, unsigned long ofs)
 {
 	unsigned long (*set_bank)(unsigned long) =
 		(unsigned long(*)(unsigned long))map->map_priv_2;

 	return (set_bank ? set_bank(ofs) : ofs);
 }

 #ifdef __ARMEB__
 /*
  * Rev A0 and A1 of IXP2400 silicon have a broken addressing unit which
  * causes the lower address bits to be XORed with 0x11 on 8 bit accesses
  * and XORed with 0x10 on 16 bit accesses. See the spec update, erratum 44.
  */
 static int erratum44_workaround = 0;

 static inline unsigned long address_fix8_write(unsigned long addr)
 {
 	if (erratum44_workaround) {
 		return (addr ^ 3);
 	}
 	return addr;
 }
 #else

 #define address_fix8_write(x)	(x)
 #endif

 static map_word ixp2000_flash_read8(struct map_info *map, unsigned long ofs)
 {
 	map_word val;

 	val.x[0] =  *((u8 *)(map->map_priv_1 + flash_bank_setup(map, ofs)));
 	return val;
 }

 /*
  * We can't use the standard memcpy due to the broken SlowPort
  * address translation on rev A0 and A1 silicon and the fact that
  * we have banked flash.
  */
 static void ixp2000_flash_copy_from(struct map_info *map, void *to,
 			      unsigned long from, ssize_t len)
 {
 	from = flash_bank_setup(map, from);
 	while(len--)
 		*(__u8 *) to++ = *(__u8 *)(map->map_priv_1 + from++);
 }

 static void ixp2000_flash_write8(struct map_info *map, map_word d, unsigned long ofs)
 {
 	*(__u8 *) (address_fix8_write(map->map_priv_1 +
 				      flash_bank_setup(map, ofs))) = d.x[0];
 }

 static void ixp2000_flash_copy_to(struct map_info *map, unsigned long to,
 			    const void *from, ssize_t len)
 {
 	to = flash_bank_setup(map, to);
 	while(len--) {
 		unsigned long tmp = address_fix8_write(map->map_priv_1 + to++);
 		*(__u8 *)(tmp) = *(__u8 *)(from++);
 	}
 }


 static int ixp2000_flash_remove(struct device *_dev)
 {
 	struct platform_device *dev = to_platform_device(_dev);
 	struct flash_platform_data *plat = dev->dev.platform_data;
 	struct ixp2000_flash_info *info = dev_get_drvdata(&dev->dev);

 	dev_set_drvdata(&dev->dev, NULL);

 	if(!info)
 		return 0;

 	if (info->mtd) {
 		del_mtd_partitions(info->mtd);
 		map_destroy(info->mtd);
 	}
 	if (info->map.map_priv_1)
 		iounmap((void *) info->map.map_priv_1);

 	if (info->partitions) {
 		kfree(info->partitions); }

 	if (info->res) {
 		release_resource(info->res);
 		kfree(info->res);
 	}

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

 	return 0;
 }


 static int ixp2000_flash_probe(struct device *_dev)
 {
 	static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
 	struct platform_device *dev = to_platform_device(_dev);
 	struct ixp2000_flash_data *ixp_data = dev->dev.platform_data;
 	struct flash_platform_data *plat;
 	struct ixp2000_flash_info *info;
 	unsigned long window_size;
 	int err = -1;

 	if (!ixp_data)
 		return -ENODEV;

 	plat = ixp_data->platform_data;
 	if (!plat)
 		return -ENODEV;

 	window_size = dev->resource->end - dev->resource->start + 1;
 	dev_info(_dev, "Probe of IXP2000 flash(%d banks x %dMiB)\n",
 			ixp_data->nr_banks, ((u32)window_size >> 20));

 	if (plat->width != 1) {
 		dev_err(_dev, "IXP2000 MTD map only supports 8-bit mode, asking for %d\n",
 				plat->width * 8);
 		return -EIO;
 	}

 	info = kmalloc(sizeof(struct ixp2000_flash_info), GFP_KERNEL);
 	if(!info) {
 		err = -ENOMEM;
 		goto Error;
 	}
 	memzero(info, sizeof(struct ixp2000_flash_info));

 	dev_set_drvdata(&dev->dev, info);

 	/*
 	 * Tell the MTD layer we're not 1:1 mapped so that it does
 	 * not attempt to do a direct access on us.
 	 */
 	info->map.phys = NO_XIP;

 	info->nr_banks = ixp_data->nr_banks;
 	info->map.size = ixp_data->nr_banks * window_size;
 	info->map.bankwidth = 1;

 	/*
  	 * map_priv_2 is used to store a ptr to to the bank_setup routine
  	 */
 	info->map.map_priv_2 = (void __iomem *) ixp_data->bank_setup;

 	info->map.name = dev->dev.bus_id;
 	info->map.read = ixp2000_flash_read8;
 	info->map.write = ixp2000_flash_write8;
 	info->map.copy_from = ixp2000_flash_copy_from;
 	info->map.copy_to = ixp2000_flash_copy_to;

 	info->res = request_mem_region(dev->resource->start,
 			dev->resource->end - dev->resource->start + 1,
 			dev->dev.bus_id);
 	if (!info->res) {
 		dev_err(_dev, "Could not reserve memory region\n");
 		err = -ENOMEM;
 		goto Error;
 	}

 	info->map.map_priv_1 = ioremap(dev->resource->start,
 			    	dev->resource->end - dev->resource->start + 1);
 	if (!info->map.map_priv_1) {
 		dev_err(_dev, "Failed to ioremap flash region\n");
 		err = -EIO;
 		goto Error;
 	}

 #if defined(__ARMEB__)
 	/*
 	 * Enable erratum 44 workaround for NPUs with broken slowport
 	 */

 	erratum44_workaround = ixp2000_has_broken_slowport();
 	dev_info(_dev, "Erratum 44 workaround %s\n",
 	       erratum44_workaround ? "enabled" : "disabled");
 #endif

 	info->mtd = do_map_probe(plat->map_name, &info->map);
 	if (!info->mtd) {
 		dev_err(_dev, "map_probe failed\n");
 		err = -ENXIO;
 		goto Error;
 	}
 	info->mtd->owner = THIS_MODULE;

 	err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
 	if (err > 0) {
 		err = add_mtd_partitions(info->mtd, info->partitions, err);
 		if(err)
 			dev_err(_dev, "Could not parse partitions\n");
 	}

 	if (err)
 		goto Error;

 	return 0;

 Error:
 	ixp2000_flash_remove(_dev);
 	return err;
 }

 static struct device_driver ixp2000_flash_driver = {
 	.name		= "IXP2000-Flash",
 	.bus		= &platform_bus_type,
 	.probe		= &ixp2000_flash_probe,
 	.remove		= &ixp2000_flash_remove
 };

 static int __init ixp2000_flash_init(void)
 {
 	return driver_register(&ixp2000_flash_driver);
 }

 static void __exit ixp2000_flash_exit(void)
 {
 	driver_unregister(&ixp2000_flash_driver);
 }

 module_init(ixp2000_flash_init);
 module_exit(ixp2000_flash_exit);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
	/*
	* $Id: ixp2000.c,v 1.6 2005/03/18 14:07:46 gleixner Exp $
	*
	* drivers/mtd/maps/ixp2000.c
	*
	* Mapping for the Intel XScale IXP2000 based systems
	*
	* Copyright (C) 2002 Intel Corp.
	* Copyright (C) 2003-2004 MontaVista Software, Inc.
	*
	* Original Author: Naeem M Afzal <naeem.m.afzal@intel.com>
	* Maintainer: Deepak Saxena <dsaxena@plexity.net>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	*/

	#include <linux/module.h>
	#include <linux/types.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/string.h>
	#include <linux/slab.h>
	#include <linux/ioport.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 <asm/io.h>
	#include <asm/hardware.h>
	#include <asm/mach/flash.h>

	#include <linux/reboot.h>

	struct ixp2000_flash_info {
	struct mtd_info *mtd;
	struct map_info map;
	struct mtd_partition *partitions;
	struct resource *res;
	int nr_banks;
	};

	static inline unsigned long flash_bank_setup(struct map_info *map, unsigned long ofs)
	{
	unsigned long (*set_bank)(unsigned long) =
	(unsigned long(*)(unsigned long))map->map_priv_2;

	return (set_bank ? set_bank(ofs) : ofs);
	}

	#ifdef __ARMEB__
	/*
	* Rev A0 and A1 of IXP2400 silicon have a broken addressing unit which
	* causes the lower address bits to be XORed with 0x11 on 8 bit accesses
	* and XORed with 0x10 on 16 bit accesses. See the spec update, erratum 44.
	*/
	static int erratum44_workaround = 0;

	static inline unsigned long address_fix8_write(unsigned long addr)
	{
	if (erratum44_workaround) {
	return (addr ^ 3);
	}
	return addr;
	}
	#else

	#define address_fix8_write(x) (x)
	#endif

	static map_word ixp2000_flash_read8(struct map_info *map, unsigned long ofs)
	{
	map_word val;

	val.x[0] = ((u8 )(map->map_priv_1 + flash_bank_setup(map, ofs)));
	return val;
	}

	/*
	* We can't use the standard memcpy due to the broken SlowPort
	* address translation on rev A0 and A1 silicon and the fact that
	* we have banked flash.
	*/
	static void ixp2000_flash_copy_from(struct map_info map, void to,
	unsigned long from, ssize_t len)
	{
	from = flash_bank_setup(map, from);
	while(len--)
	(__u8 ) to++ = (__u8 )(map->map_priv_1 + from++);
	}

	static void ixp2000_flash_write8(struct map_info *map, map_word d, unsigned long ofs)
	{
	(__u8 ) (address_fix8_write(map->map_priv_1 +
	flash_bank_setup(map, ofs))) = d.x[0];
	}

	static void ixp2000_flash_copy_to(struct map_info *map, unsigned long to,
	const void *from, ssize_t len)
	{
	to = flash_bank_setup(map, to);
	while(len--) {
	unsigned long tmp = address_fix8_write(map->map_priv_1 + to++);
	(__u8 )(tmp) = (__u8 )(from++);
	}
	}


	static int ixp2000_flash_remove(struct device *_dev)
	{
	struct platform_device *dev = to_platform_device(_dev);
	struct flash_platform_data *plat = dev->dev.platform_data;
	struct ixp2000_flash_info *info = dev_get_drvdata(&dev->dev);

	dev_set_drvdata(&dev->dev, NULL);

	if(!info)
	return 0;

	if (info->mtd) {
	del_mtd_partitions(info->mtd);
	map_destroy(info->mtd);
	}
	if (info->map.map_priv_1)
	iounmap((void *) info->map.map_priv_1);

	if (info->partitions) {
	kfree(info->partitions); }

	if (info->res) {
	release_resource(info->res);
	kfree(info->res);
	}

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

	return 0;
	}


	static int ixp2000_flash_probe(struct device *_dev)
	{
	static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
	struct platform_device *dev = to_platform_device(_dev);
	struct ixp2000_flash_data *ixp_data = dev->dev.platform_data;
	struct flash_platform_data *plat;
	struct ixp2000_flash_info *info;
	unsigned long window_size;
	int err = -1;

	if (!ixp_data)
	return -ENODEV;

	plat = ixp_data->platform_data;
	if (!plat)
	return -ENODEV;

	window_size = dev->resource->end - dev->resource->start + 1;
	dev_info(_dev, "Probe of IXP2000 flash(%d banks x %dMiB)\n",
	ixp_data->nr_banks, ((u32)window_size >> 20));

	if (plat->width != 1) {
	dev_err(_dev, "IXP2000 MTD map only supports 8-bit mode, asking for %d\n",
	plat->width * 8);
	return -EIO;
	}

	info = kmalloc(sizeof(struct ixp2000_flash_info), GFP_KERNEL);
	if(!info) {
	err = -ENOMEM;
	goto Error;
	}
	memzero(info, sizeof(struct ixp2000_flash_info));

	dev_set_drvdata(&dev->dev, info);

	/*
	* Tell the MTD layer we're not 1:1 mapped so that it does
	* not attempt to do a direct access on us.
	*/
	info->map.phys = NO_XIP;

	info->nr_banks = ixp_data->nr_banks;
	info->map.size = ixp_data->nr_banks * window_size;
	info->map.bankwidth = 1;

	/*
	* map_priv_2 is used to store a ptr to to the bank_setup routine
	*/
	info->map.map_priv_2 = (void __iomem *) ixp_data->bank_setup;

	info->map.name = dev->dev.bus_id;
	info->map.read = ixp2000_flash_read8;
	info->map.write = ixp2000_flash_write8;
	info->map.copy_from = ixp2000_flash_copy_from;
	info->map.copy_to = ixp2000_flash_copy_to;

	info->res = request_mem_region(dev->resource->start,
	dev->resource->end - dev->resource->start + 1,
	dev->dev.bus_id);
	if (!info->res) {
	dev_err(_dev, "Could not reserve memory region\n");
	err = -ENOMEM;
	goto Error;
	}

	info->map.map_priv_1 = ioremap(dev->resource->start,
	dev->resource->end - dev->resource->start + 1);
	if (!info->map.map_priv_1) {
	dev_err(_dev, "Failed to ioremap flash region\n");
	err = -EIO;
	goto Error;
	}

	#if defined(__ARMEB__)
	/*
	* Enable erratum 44 workaround for NPUs with broken slowport
	*/

	erratum44_workaround = ixp2000_has_broken_slowport();
	dev_info(_dev, "Erratum 44 workaround %s\n",
	erratum44_workaround ? "enabled" : "disabled");
	#endif

	info->mtd = do_map_probe(plat->map_name, &info->map);
	if (!info->mtd) {
	dev_err(_dev, "map_probe failed\n");
	err = -ENXIO;
	goto Error;
	}
	info->mtd->owner = THIS_MODULE;

	err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
	if (err > 0) {
	err = add_mtd_partitions(info->mtd, info->partitions, err);
	if(err)
	dev_err(_dev, "Could not parse partitions\n");
	}

	if (err)
	goto Error;

	return 0;

	Error:
	ixp2000_flash_remove(_dev);
	return err;
	}

	static struct device_driver ixp2000_flash_driver = {
	.name = "IXP2000-Flash",
	.bus = &platform_bus_type,
	.probe = &ixp2000_flash_probe,
	.remove = &ixp2000_flash_remove
	};

	static int __init ixp2000_flash_init(void)
	{
	return driver_register(&ixp2000_flash_driver);
	}

	static void __exit ixp2000_flash_exit(void)
	{
	driver_unregister(&ixp2000_flash_driver);
	}

	module_init(ixp2000_flash_init);
	module_exit(ixp2000_flash_exit);
	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");