drivers/mtd/maps/ixp4xx.c - maze/linux - Git at Google

 /*
  * drivers/mtd/maps/ixp4xx.c
  *
  * MTD Map file for IXP4XX based systems. Please do not make per-board
  * changes in here. If your board needs special setup, do it in your
  * platform level code in arch/arm/mach-ixp4xx/board-setup.c
  *
  * Original Author: Intel Corporation
  * Maintainer: Deepak Saxena <dsaxena@mvista.com>
  *
  * Copyright (C) 2002 Intel Corporation
  * Copyright (C) 2003-2004 MontaVista Software, Inc.
  *
  */

 #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/mach/flash.h>

 #include <linux/reboot.h>

 /*
  * Read/write a 16 bit word from flash address 'addr'.
  *
  * When the cpu is in little-endian mode it swizzles the address lines
  * ('address coherency') so we need to undo the swizzling to ensure commands
  * and the like end up on the correct flash address.
  *
  * To further complicate matters, due to the way the expansion bus controller
  * handles 32 bit reads, the byte stream ABCD is stored on the flash as:
  *     D15    D0
  *     +---+---+
  *     | A | B | 0
  *     +---+---+
  *     | C | D | 2
  *     +---+---+
  * This means that on LE systems each 16 bit word must be swapped. Note that
  * this requires CONFIG_MTD_CFI_BE_BYTE_SWAP to be enabled to 'unswap' the CFI
  * data and other flash commands which are always in D7-D0.
  */
 #ifndef __ARMEB__
 #ifndef CONFIG_MTD_CFI_BE_BYTE_SWAP
 #  error CONFIG_MTD_CFI_BE_BYTE_SWAP required
 #endif

 static inline u16 flash_read16(void __iomem *addr)
 {
 	return be16_to_cpu(__raw_readw((void __iomem *)((unsigned long)addr ^ 0x2)));
 }

 static inline void flash_write16(u16 d, void __iomem *addr)
 {
 	__raw_writew(cpu_to_be16(d), (void __iomem *)((unsigned long)addr ^ 0x2));
 }

 #define	BYTE0(h)	((h) & 0xFF)
 #define	BYTE1(h)	(((h) >> 8) & 0xFF)

 #else

 static inline u16 flash_read16(const void __iomem *addr)
 {
 	return __raw_readw(addr);
 }

 static inline void flash_write16(u16 d, void __iomem *addr)
 {
 	__raw_writew(d, addr);
 }

 #define	BYTE0(h)	(((h) >> 8) & 0xFF)
 #define	BYTE1(h)	((h) & 0xFF)
 #endif

 static map_word ixp4xx_read16(struct map_info *map, unsigned long ofs)
 {
 	map_word val;
 	val.x[0] = flash_read16(map->virt + ofs);
 	return val;
 }

 /*
  * The IXP4xx expansion bus only allows 16-bit wide acceses
  * when attached to a 16-bit wide device (such as the 28F128J3A),
  * so we can't just memcpy_fromio().
  */
 static void ixp4xx_copy_from(struct map_info *map, void *to,
 			     unsigned long from, ssize_t len)
 {
 	u8 *dest = (u8 *) to;
 	void __iomem *src = map->virt + from;

 	if (len <= 0)
 		return;

 	if (from & 1) {
 		*dest++ = BYTE1(flash_read16(src-1));
 		src++;
 		--len;
 	}

 	while (len >= 2) {
 		u16 data = flash_read16(src);
 		*dest++ = BYTE0(data);
 		*dest++ = BYTE1(data);
 		src += 2;
 		len -= 2;
 	}

 	if (len > 0)
 		*dest++ = BYTE0(flash_read16(src));
 }

 /*
  * Unaligned writes are ignored, causing the 8-bit
  * probe to fail and proceed to the 16-bit probe (which succeeds).
  */
 static void ixp4xx_probe_write16(struct map_info *map, map_word d, unsigned long adr)
 {
 	if (!(adr & 1))
 		flash_write16(d.x[0], map->virt + adr);
 }

 /*
  * Fast write16 function without the probing check above
  */
 static void ixp4xx_write16(struct map_info *map, map_word d, unsigned long adr)
 {
 	flash_write16(d.x[0], map->virt + adr);
 }

 struct ixp4xx_flash_info {
 	struct mtd_info *mtd;
 	struct map_info map;
 	struct resource *res;
 };

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

 static int ixp4xx_flash_remove(struct platform_device *dev)
 {
 	struct flash_platform_data *plat = dev_get_platdata(&dev->dev);
 	struct ixp4xx_flash_info *info = platform_get_drvdata(dev);

 	if(!info)
 		return 0;

 	if (info->mtd) {
 		mtd_device_unregister(info->mtd);
 		map_destroy(info->mtd);
 	}
 	if (info->map.virt)
 		iounmap(info->map.virt);

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

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

 	return 0;
 }

 static int ixp4xx_flash_probe(struct platform_device *dev)
 {
 	struct flash_platform_data *plat = dev_get_platdata(&dev->dev);
 	struct ixp4xx_flash_info *info;
 	struct mtd_part_parser_data ppdata = {
 		.origin = dev->resource->start,
 	};
 	int err = -1;

 	if (!plat)
 		return -ENODEV;

 	if (plat->init) {
 		err = plat->init();
 		if (err)
 			return err;
 	}

 	info = kzalloc(sizeof(struct ixp4xx_flash_info), GFP_KERNEL);
 	if(!info) {
 		err = -ENOMEM;
 		goto Error;
 	}

 	platform_set_drvdata(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->map.size = resource_size(dev->resource);

 	/*
 	 * We only support 16-bit accesses for now. If and when
 	 * any board use 8-bit access, we'll fixup the driver to
 	 * handle that.
 	 */
 	info->map.bankwidth = 2;
 	info->map.name = dev_name(&dev->dev);
 	info->map.read = ixp4xx_read16;
 	info->map.write = ixp4xx_probe_write16;
 	info->map.copy_from = ixp4xx_copy_from;

 	info->res = request_mem_region(dev->resource->start,
 			resource_size(dev->resource),
 			"IXP4XXFlash");
 	if (!info->res) {
 		printk(KERN_ERR "IXP4XXFlash: Could not reserve memory region\n");
 		err = -ENOMEM;
 		goto Error;
 	}

 	info->map.virt = ioremap(dev->resource->start,
 				 resource_size(dev->resource));
 	if (!info->map.virt) {
 		printk(KERN_ERR "IXP4XXFlash: Failed to ioremap region\n");
 		err = -EIO;
 		goto Error;
 	}

 	info->mtd = do_map_probe(plat->map_name, &info->map);
 	if (!info->mtd) {
 		printk(KERN_ERR "IXP4XXFlash: map_probe failed\n");
 		err = -ENXIO;
 		goto Error;
 	}
 	info->mtd->owner = THIS_MODULE;

 	/* Use the fast version */
 	info->map.write = ixp4xx_write16;

 	err = mtd_device_parse_register(info->mtd, probes, &ppdata,
 			plat->parts, plat->nr_parts);
 	if (err) {
 		printk(KERN_ERR "Could not parse partitions\n");
 		goto Error;
 	}

 	return 0;

 Error:
 	ixp4xx_flash_remove(dev);
 	return err;
 }

 static struct platform_driver ixp4xx_flash_driver = {
 	.probe		= ixp4xx_flash_probe,
 	.remove		= ixp4xx_flash_remove,
 	.driver		= {
 		.name	= "IXP4XX-Flash",
 		.owner	= THIS_MODULE,
 	},
 };

 module_platform_driver(ixp4xx_flash_driver);

 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("MTD map driver for Intel IXP4xx systems");
 MODULE_AUTHOR("Deepak Saxena");
 MODULE_ALIAS("platform:IXP4XX-Flash");
	/*
	* drivers/mtd/maps/ixp4xx.c
	*
	* MTD Map file for IXP4XX based systems. Please do not make per-board
	* changes in here. If your board needs special setup, do it in your
	* platform level code in arch/arm/mach-ixp4xx/board-setup.c
	*
	* Original Author: Intel Corporation
	* Maintainer: Deepak Saxena <dsaxena@mvista.com>
	*
	* Copyright (C) 2002 Intel Corporation
	* Copyright (C) 2003-2004 MontaVista Software, Inc.
	*
	*/

	#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/mach/flash.h>

	#include <linux/reboot.h>

	/*
	* Read/write a 16 bit word from flash address 'addr'.
	*
	* When the cpu is in little-endian mode it swizzles the address lines
	* ('address coherency') so we need to undo the swizzling to ensure commands
	* and the like end up on the correct flash address.
	*
	* To further complicate matters, due to the way the expansion bus controller
	* handles 32 bit reads, the byte stream ABCD is stored on the flash as:
	* D15 D0
	* +---+---+
	* \| A \| B \| 0
	* +---+---+
	* \| C \| D \| 2
	* +---+---+
	* This means that on LE systems each 16 bit word must be swapped. Note that
	* this requires CONFIG_MTD_CFI_BE_BYTE_SWAP to be enabled to 'unswap' the CFI
	* data and other flash commands which are always in D7-D0.
	*/
	#ifndef __ARMEB__
	#ifndef CONFIG_MTD_CFI_BE_BYTE_SWAP
	# error CONFIG_MTD_CFI_BE_BYTE_SWAP required
	#endif

	static inline u16 flash_read16(void __iomem *addr)
	{
	return be16_to_cpu(__raw_readw((void __iomem *)((unsigned long)addr ^ 0x2)));
	}

	static inline void flash_write16(u16 d, void __iomem *addr)
	{
	__raw_writew(cpu_to_be16(d), (void __iomem *)((unsigned long)addr ^ 0x2));
	}

	#define BYTE0(h) ((h) & 0xFF)
	#define BYTE1(h) (((h) >> 8) & 0xFF)

	#else

	static inline u16 flash_read16(const void __iomem *addr)
	{
	return __raw_readw(addr);
	}

	static inline void flash_write16(u16 d, void __iomem *addr)
	{
	__raw_writew(d, addr);
	}

	#define BYTE0(h) (((h) >> 8) & 0xFF)
	#define BYTE1(h) ((h) & 0xFF)
	#endif

	static map_word ixp4xx_read16(struct map_info *map, unsigned long ofs)
	{
	map_word val;
	val.x[0] = flash_read16(map->virt + ofs);
	return val;
	}

	/*
	* The IXP4xx expansion bus only allows 16-bit wide acceses
	* when attached to a 16-bit wide device (such as the 28F128J3A),
	* so we can't just memcpy_fromio().
	*/
	static void ixp4xx_copy_from(struct map_info map, void to,
	unsigned long from, ssize_t len)
	{
	u8 dest = (u8 ) to;
	void __iomem *src = map->virt + from;

	if (len <= 0)
	return;

	if (from & 1) {
	*dest++ = BYTE1(flash_read16(src-1));
	src++;
	--len;
	}

	while (len >= 2) {
	u16 data = flash_read16(src);
	*dest++ = BYTE0(data);
	*dest++ = BYTE1(data);
	src += 2;
	len -= 2;
	}

	if (len > 0)
	*dest++ = BYTE0(flash_read16(src));
	}

	/*
	* Unaligned writes are ignored, causing the 8-bit
	* probe to fail and proceed to the 16-bit probe (which succeeds).
	*/
	static void ixp4xx_probe_write16(struct map_info *map, map_word d, unsigned long adr)
	{
	if (!(adr & 1))
	flash_write16(d.x[0], map->virt + adr);
	}

	/*
	* Fast write16 function without the probing check above
	*/
	static void ixp4xx_write16(struct map_info *map, map_word d, unsigned long adr)
	{
	flash_write16(d.x[0], map->virt + adr);
	}

	struct ixp4xx_flash_info {
	struct mtd_info *mtd;
	struct map_info map;
	struct resource *res;
	};

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

	static int ixp4xx_flash_remove(struct platform_device *dev)
	{
	struct flash_platform_data *plat = dev_get_platdata(&dev->dev);
	struct ixp4xx_flash_info *info = platform_get_drvdata(dev);

	if(!info)
	return 0;

	if (info->mtd) {
	mtd_device_unregister(info->mtd);
	map_destroy(info->mtd);
	}
	if (info->map.virt)
	iounmap(info->map.virt);

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

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

	return 0;
	}

	static int ixp4xx_flash_probe(struct platform_device *dev)
	{
	struct flash_platform_data *plat = dev_get_platdata(&dev->dev);
	struct ixp4xx_flash_info *info;
	struct mtd_part_parser_data ppdata = {
	.origin = dev->resource->start,
	};
	int err = -1;

	if (!plat)
	return -ENODEV;

	if (plat->init) {
	err = plat->init();
	if (err)
	return err;
	}

	info = kzalloc(sizeof(struct ixp4xx_flash_info), GFP_KERNEL);
	if(!info) {
	err = -ENOMEM;
	goto Error;
	}

	platform_set_drvdata(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->map.size = resource_size(dev->resource);

	/*
	* We only support 16-bit accesses for now. If and when
	* any board use 8-bit access, we'll fixup the driver to
	* handle that.
	*/
	info->map.bankwidth = 2;
	info->map.name = dev_name(&dev->dev);
	info->map.read = ixp4xx_read16;
	info->map.write = ixp4xx_probe_write16;
	info->map.copy_from = ixp4xx_copy_from;

	info->res = request_mem_region(dev->resource->start,
	resource_size(dev->resource),
	"IXP4XXFlash");
	if (!info->res) {
	printk(KERN_ERR "IXP4XXFlash: Could not reserve memory region\n");
	err = -ENOMEM;
	goto Error;
	}

	info->map.virt = ioremap(dev->resource->start,
	resource_size(dev->resource));
	if (!info->map.virt) {
	printk(KERN_ERR "IXP4XXFlash: Failed to ioremap region\n");
	err = -EIO;
	goto Error;
	}

	info->mtd = do_map_probe(plat->map_name, &info->map);
	if (!info->mtd) {
	printk(KERN_ERR "IXP4XXFlash: map_probe failed\n");
	err = -ENXIO;
	goto Error;
	}
	info->mtd->owner = THIS_MODULE;

	/* Use the fast version */
	info->map.write = ixp4xx_write16;

	err = mtd_device_parse_register(info->mtd, probes, &ppdata,
	plat->parts, plat->nr_parts);
	if (err) {
	printk(KERN_ERR "Could not parse partitions\n");
	goto Error;
	}

	return 0;

	Error:
	ixp4xx_flash_remove(dev);
	return err;
	}

	static struct platform_driver ixp4xx_flash_driver = {
	.probe = ixp4xx_flash_probe,
	.remove = ixp4xx_flash_remove,
	.driver = {
	.name = "IXP4XX-Flash",
	.owner = THIS_MODULE,
	},
	};

	module_platform_driver(ixp4xx_flash_driver);

	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("MTD map driver for Intel IXP4xx systems");
	MODULE_AUTHOR("Deepak Saxena");
	MODULE_ALIAS("platform:IXP4XX-Flash");