drivers/mtd/maps/tqm8xxl.c - maze/linux - Git at Google

 /*
  * Handle mapping of the flash memory access routines
  * on TQM8xxL based devices.
  *
  * $Id: tqm8xxl.c,v 1.13 2004/10/20 22:21:53 dwmw2 Exp $
  *
  * based on rpxlite.c
  *
  * Copyright(C) 2001 Kirk Lee <kirk@hpc.ee.ntu.edu.tw>
  *
  * This code is GPLed
  *
  */

 /*
  * According to TQM8xxL hardware manual, TQM8xxL series have
  * following flash memory organisations:
  *	| capacity |	| chip type |	| bank0 |	| bank1 |
  *	    2MiB	   512Kx16	  2MiB		   0
  *	    4MiB	   1Mx16	  4MiB		   0
  *	    8MiB	   1Mx16	  4MiB		   4MiB
  * Thus, we choose CONFIG_MTD_CFI_I2 & CONFIG_MTD_CFI_B4 at
  * kernel configuration.
  */
 #include <linux/config.h>
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/slab.h>

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

 #include <asm/io.h>

 #define FLASH_ADDR 0x40000000
 #define FLASH_SIZE 0x00800000
 #define FLASH_BANK_MAX 4

 // trivial struct to describe partition information
 struct mtd_part_def
 {
 	int nums;
 	unsigned char *type;
 	struct mtd_partition* mtd_part;
 };

 //static struct mtd_info *mymtd;
 static struct mtd_info* mtd_banks[FLASH_BANK_MAX];
 static struct map_info* map_banks[FLASH_BANK_MAX];
 static struct mtd_part_def part_banks[FLASH_BANK_MAX];
 static unsigned long num_banks;
 static void __iomem *start_scan_addr;

 /*
  * Here are partition information for all known TQM8xxL series devices.
  * See include/linux/mtd/partitions.h for definition of the mtd_partition
  * structure.
  *
  * The *_max_flash_size is the maximum possible mapped flash size which
  * is not necessarily the actual flash size.  It must correspond to the
  * value specified in the mapping definition defined by the
  * "struct map_desc *_io_desc" for the corresponding machine.
  */

 #ifdef CONFIG_MTD_PARTITIONS
 /* Currently, TQM8xxL has upto 8MiB flash */
 static unsigned long tqm8xxl_max_flash_size = 0x00800000;

 /* partition definition for first flash bank
  * (cf. "drivers/char/flash_config.c")
  */
 static struct mtd_partition tqm8xxl_partitions[] = {
 	{
 	  .name = "ppcboot",
 	  .offset = 0x00000000,
 	  .size = 0x00020000,           /* 128KB           */
 	  .mask_flags = MTD_WRITEABLE,  /* force read-only */
 	},
 	{
 	  .name = "kernel",             /* default kernel image */
 	  .offset = 0x00020000,
 	  .size = 0x000e0000,
 	  .mask_flags = MTD_WRITEABLE,  /* force read-only */
 	},
 	{
 	  .name = "user",
 	  .offset = 0x00100000,
 	  .size = 0x00100000,
 	},
 	{
 	  .name = "initrd",
 	  .offset = 0x00200000,
 	  .size = 0x00200000,
 	}
 };
 /* partition definition for second flash bank */
 static struct mtd_partition tqm8xxl_fs_partitions[] = {
 	{
 	  .name = "cramfs",
 	  .offset = 0x00000000,
 	  .size = 0x00200000,
 	},
 	{
 	  .name = "jffs",
 	  .offset = 0x00200000,
 	  .size = 0x00200000,
 	  //.size = MTDPART_SIZ_FULL,
 	}
 };
 #endif

 int __init init_tqm_mtd(void)
 {
 	int idx = 0, ret = 0;
 	unsigned long flash_addr, flash_size, mtd_size = 0;
 	/* pointer to TQM8xxL board info data */
 	bd_t *bd = (bd_t *)__res;

 	flash_addr = bd->bi_flashstart;
 	flash_size = bd->bi_flashsize;

 	//request maximum flash size address space
 	start_scan_addr = ioremap(flash_addr, flash_size);
 	if (!start_scan_addr) {
 		printk(KERN_WARNING "%s:Failed to ioremap address:0x%x\n", __FUNCTION__, flash_addr);
 		return -EIO;
 	}

 	for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
 		if(mtd_size >= flash_size)
 			break;

 		printk(KERN_INFO "%s: chip probing count %d\n", __FUNCTION__, idx);

 		map_banks[idx] = (struct map_info *)kmalloc(sizeof(struct map_info), GFP_KERNEL);
 		if(map_banks[idx] == NULL) {
 			ret = -ENOMEM;
 			/* FIXME: What if some MTD devices were probed already? */
 			goto error_mem;
 		}

 		memset((void *)map_banks[idx], 0, sizeof(struct map_info));
 		map_banks[idx]->name = (char *)kmalloc(16, GFP_KERNEL);

 		if (!map_banks[idx]->name) {
 			ret = -ENOMEM;
 			/* FIXME: What if some MTD devices were probed already? */
 			goto error_mem;
 		}
 		sprintf(map_banks[idx]->name, "TQM8xxL%d", idx);

 		map_banks[idx]->size = flash_size;
 		map_banks[idx]->bankwidth = 4;

 		simple_map_init(map_banks[idx]);

 		map_banks[idx]->virt = start_scan_addr;
 		map_banks[idx]->phys = flash_addr;
 		/* FIXME: This looks utterly bogus, but I'm trying to
 		   preserve the behaviour of the original (shown here)...

 		map_banks[idx]->map_priv_1 =
 		start_scan_addr + ((idx > 0) ?
 		(mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0);
 		*/

 		if (idx && mtd_banks[idx-1]) {
 			map_banks[idx]->virt += mtd_banks[idx-1]->size;
 			map_banks[idx]->phys += mtd_banks[idx-1]->size;
 		}

 		//start to probe flash chips
 		mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]);

 		if (mtd_banks[idx]) {
 			mtd_banks[idx]->owner = THIS_MODULE;
 			mtd_size += mtd_banks[idx]->size;
 			num_banks++;

 			printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __FUNCTION__, num_banks,
 			mtd_banks[idx]->name, mtd_banks[idx]->size);
 		}
 	}

 	/* no supported flash chips found */
 	if (!num_banks) {
 		printk(KERN_NOTICE "TQM8xxL: No support flash chips found!\n");
 		ret = -ENXIO;
 		goto error_mem;
 	}

 #ifdef CONFIG_MTD_PARTITIONS
 	/*
 	 * Select Static partition definitions
 	 */
 	part_banks[0].mtd_part = tqm8xxl_partitions;
 	part_banks[0].type = "Static image";
 	part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions);

 	part_banks[1].mtd_part = tqm8xxl_fs_partitions;
 	part_banks[1].type = "Static file system";
 	part_banks[1].nums = ARRAY_SIZE(tqm8xxl_fs_partitions);

 	for(idx = 0; idx < num_banks ; idx++) {
 		if (part_banks[idx].nums == 0) {
 			printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx);
 			add_mtd_device(mtd_banks[idx]);
 		} else {
 			printk(KERN_NOTICE "TQM flash%d: Using %s partition definition\n",
 					idx, part_banks[idx].type);
 			add_mtd_partitions(mtd_banks[idx], part_banks[idx].mtd_part,
 								part_banks[idx].nums);
 		}
 	}
 #else
 	printk(KERN_NOTICE "TQM flash: registering %d whole flash banks at once\n", num_banks);
 	for(idx = 0 ; idx < num_banks ; idx++)
 		add_mtd_device(mtd_banks[idx]);
 #endif
 	return 0;
 error_mem:
 	for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
 		if(map_banks[idx] != NULL) {
 			if(map_banks[idx]->name != NULL) {
 				kfree(map_banks[idx]->name);
 				map_banks[idx]->name = NULL;
 			}
 			kfree(map_banks[idx]);
 			map_banks[idx] = NULL;
 		}
 	}
 error:
 	iounmap(start_scan_addr);
 	return ret;
 }

 static void __exit cleanup_tqm_mtd(void)
 {
 	unsigned int idx = 0;
 	for(idx = 0 ; idx < num_banks ; idx++) {
 		/* destroy mtd_info previously allocated */
 		if (mtd_banks[idx]) {
 			del_mtd_partitions(mtd_banks[idx]);
 			map_destroy(mtd_banks[idx]);
 		}
 		/* release map_info not used anymore */
 		kfree(map_banks[idx]->name);
 		kfree(map_banks[idx]);
 	}

 	if (start_scan_addr) {
 		iounmap(start_scan_addr);
 		start_scan_addr = 0;
 	}
 }

 module_init(init_tqm_mtd);
 module_exit(cleanup_tqm_mtd);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>");
 MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards");
	/*
	* Handle mapping of the flash memory access routines
	* on TQM8xxL based devices.
	*
	* $Id: tqm8xxl.c,v 1.13 2004/10/20 22:21:53 dwmw2 Exp $
	*
	* based on rpxlite.c
	*
	* Copyright(C) 2001 Kirk Lee <kirk@hpc.ee.ntu.edu.tw>
	*
	* This code is GPLed
	*
	*/

	/*
	* According to TQM8xxL hardware manual, TQM8xxL series have
	* following flash memory organisations:
	* \| capacity \| \| chip type \| \| bank0 \| \| bank1 \|
	* 2MiB 512Kx16 2MiB 0
	* 4MiB 1Mx16 4MiB 0
	* 8MiB 1Mx16 4MiB 4MiB
	* Thus, we choose CONFIG_MTD_CFI_I2 & CONFIG_MTD_CFI_B4 at
	* kernel configuration.
	*/
	#include <linux/config.h>
	#include <linux/module.h>
	#include <linux/types.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/slab.h>

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

	#include <asm/io.h>

	#define FLASH_ADDR 0x40000000
	#define FLASH_SIZE 0x00800000
	#define FLASH_BANK_MAX 4

	// trivial struct to describe partition information
	struct mtd_part_def
	{
	int nums;
	unsigned char *type;
	struct mtd_partition* mtd_part;
	};

	//static struct mtd_info *mymtd;
	static struct mtd_info* mtd_banks[FLASH_BANK_MAX];
	static struct map_info* map_banks[FLASH_BANK_MAX];
	static struct mtd_part_def part_banks[FLASH_BANK_MAX];
	static unsigned long num_banks;
	static void __iomem *start_scan_addr;

	/*
	* Here are partition information for all known TQM8xxL series devices.
	* See include/linux/mtd/partitions.h for definition of the mtd_partition
	* structure.
	*
	* The *_max_flash_size is the maximum possible mapped flash size which
	* is not necessarily the actual flash size. It must correspond to the
	* value specified in the mapping definition defined by the
	* "struct map_desc *_io_desc" for the corresponding machine.
	*/

	#ifdef CONFIG_MTD_PARTITIONS
	/* Currently, TQM8xxL has upto 8MiB flash */
	static unsigned long tqm8xxl_max_flash_size = 0x00800000;

	/* partition definition for first flash bank
	* (cf. "drivers/char/flash_config.c")
	*/
	static struct mtd_partition tqm8xxl_partitions[] = {
	{
	.name = "ppcboot",
	.offset = 0x00000000,
	.size = 0x00020000, /* 128KB */
	.mask_flags = MTD_WRITEABLE, /* force read-only */
	},
	{
	.name = "kernel", /* default kernel image */
	.offset = 0x00020000,
	.size = 0x000e0000,
	.mask_flags = MTD_WRITEABLE, /* force read-only */
	},
	{
	.name = "user",
	.offset = 0x00100000,
	.size = 0x00100000,
	},
	{
	.name = "initrd",
	.offset = 0x00200000,
	.size = 0x00200000,
	}
	};
	/* partition definition for second flash bank */
	static struct mtd_partition tqm8xxl_fs_partitions[] = {
	{
	.name = "cramfs",
	.offset = 0x00000000,
	.size = 0x00200000,
	},
	{
	.name = "jffs",
	.offset = 0x00200000,
	.size = 0x00200000,
	//.size = MTDPART_SIZ_FULL,
	}
	};
	#endif

	int __init init_tqm_mtd(void)
	{
	int idx = 0, ret = 0;
	unsigned long flash_addr, flash_size, mtd_size = 0;
	/* pointer to TQM8xxL board info data */
	bd_t bd = (bd_t )__res;

	flash_addr = bd->bi_flashstart;
	flash_size = bd->bi_flashsize;

	//request maximum flash size address space
	start_scan_addr = ioremap(flash_addr, flash_size);
	if (!start_scan_addr) {
	printk(KERN_WARNING "%s:Failed to ioremap address:0x%x\n", __FUNCTION__, flash_addr);
	return -EIO;
	}

	for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
	if(mtd_size >= flash_size)
	break;

	printk(KERN_INFO "%s: chip probing count %d\n", __FUNCTION__, idx);

	map_banks[idx] = (struct map_info *)kmalloc(sizeof(struct map_info), GFP_KERNEL);
	if(map_banks[idx] == NULL) {
	ret = -ENOMEM;
	/* FIXME: What if some MTD devices were probed already? */
	goto error_mem;
	}

	memset((void *)map_banks[idx], 0, sizeof(struct map_info));
	map_banks[idx]->name = (char *)kmalloc(16, GFP_KERNEL);

	if (!map_banks[idx]->name) {
	ret = -ENOMEM;
	/* FIXME: What if some MTD devices were probed already? */
	goto error_mem;
	}
	sprintf(map_banks[idx]->name, "TQM8xxL%d", idx);

	map_banks[idx]->size = flash_size;
	map_banks[idx]->bankwidth = 4;

	simple_map_init(map_banks[idx]);

	map_banks[idx]->virt = start_scan_addr;
	map_banks[idx]->phys = flash_addr;
	/* FIXME: This looks utterly bogus, but I'm trying to
	preserve the behaviour of the original (shown here)...

	map_banks[idx]->map_priv_1 =
	start_scan_addr + ((idx > 0) ?
	(mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0);
	*/

	if (idx && mtd_banks[idx-1]) {
	map_banks[idx]->virt += mtd_banks[idx-1]->size;
	map_banks[idx]->phys += mtd_banks[idx-1]->size;
	}

	//start to probe flash chips
	mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]);

	if (mtd_banks[idx]) {
	mtd_banks[idx]->owner = THIS_MODULE;
	mtd_size += mtd_banks[idx]->size;
	num_banks++;

	printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __FUNCTION__, num_banks,
	mtd_banks[idx]->name, mtd_banks[idx]->size);
	}
	}

	/* no supported flash chips found */
	if (!num_banks) {
	printk(KERN_NOTICE "TQM8xxL: No support flash chips found!\n");
	ret = -ENXIO;
	goto error_mem;
	}

	#ifdef CONFIG_MTD_PARTITIONS
	/*
	* Select Static partition definitions
	*/
	part_banks[0].mtd_part = tqm8xxl_partitions;
	part_banks[0].type = "Static image";
	part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions);

	part_banks[1].mtd_part = tqm8xxl_fs_partitions;
	part_banks[1].type = "Static file system";
	part_banks[1].nums = ARRAY_SIZE(tqm8xxl_fs_partitions);

	for(idx = 0; idx < num_banks ; idx++) {
	if (part_banks[idx].nums == 0) {
	printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx);
	add_mtd_device(mtd_banks[idx]);
	} else {
	printk(KERN_NOTICE "TQM flash%d: Using %s partition definition\n",
	idx, part_banks[idx].type);
	add_mtd_partitions(mtd_banks[idx], part_banks[idx].mtd_part,
	part_banks[idx].nums);
	}
	}
	#else
	printk(KERN_NOTICE "TQM flash: registering %d whole flash banks at once\n", num_banks);
	for(idx = 0 ; idx < num_banks ; idx++)
	add_mtd_device(mtd_banks[idx]);
	#endif
	return 0;
	error_mem:
	for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
	if(map_banks[idx] != NULL) {
	if(map_banks[idx]->name != NULL) {
	kfree(map_banks[idx]->name);
	map_banks[idx]->name = NULL;
	}
	kfree(map_banks[idx]);
	map_banks[idx] = NULL;
	}
	}
	error:
	iounmap(start_scan_addr);
	return ret;
	}

	static void __exit cleanup_tqm_mtd(void)
	{
	unsigned int idx = 0;
	for(idx = 0 ; idx < num_banks ; idx++) {
	/* destroy mtd_info previously allocated */
	if (mtd_banks[idx]) {
	del_mtd_partitions(mtd_banks[idx]);
	map_destroy(mtd_banks[idx]);
	}
	/* release map_info not used anymore */
	kfree(map_banks[idx]->name);
	kfree(map_banks[idx]);
	}

	if (start_scan_addr) {
	iounmap(start_scan_addr);
	start_scan_addr = 0;
	}
	}

	module_init(init_tqm_mtd);
	module_exit(cleanup_tqm_mtd);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>");
	MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards");