/* * Handle mapping of the flash memory access routines  * on TQM8xxL based devices. * * $Id: tqm8xxl.c,v 1.2 2007/09/21 03:09:24 quy 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 <asm/io.h>#include <linux/mtd/mtd.h>#include <linux/mtd/map.h>#include <linux/mtd/partitions.h>#define FLASH_ADDR 0x40000000#define FLASH_SIZE 0x00800000#define FLASH_BANK_MAX 4// trivial struct to describe partition informationstruct 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 unsigned long 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,	}};#endifint __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 = (unsigned long)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((void *)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((void *)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");