/* * Flash memory access on Alchemy Db1550 board *  * $Id: db1550-flash.c,v 1.2 2007/09/21 03:09:24 quy Exp $ * * (C) 2004 Embedded Edge, LLC, based on db1550-flash.c: * (C) 2003 Pete Popov <pete_popov@yahoo.com> *  */#include <linux/config.h>#include <linux/init.h>#include <linux/module.h>#include <linux/types.h>#include <linux/kernel.h>#include <linux/mtd/mtd.h>#include <linux/mtd/map.h>#include <linux/mtd/partitions.h>#include <asm/io.h>#include <asm/au1000.h>#ifdef 	DEBUG_RW#define	DBG(x...)	printk(x)#else#define	DBG(x...)	#endifstatic unsigned long window_addr;static unsigned long window_size;static struct map_info db1550_map = {	.name =	"Db1550 flash",};static unsigned char flash_bankwidth = 4;/*  * Support only 64MB NOR Flash parts */#if defined(CONFIG_MTD_DB1550_BOOT) && defined(CONFIG_MTD_DB1550_USER)#define DB1550_BOTH_BANKS#elif defined(CONFIG_MTD_DB1550_BOOT) && !defined(CONFIG_MTD_DB1550_USER)#define DB1550_BOOT_ONLY#elif !defined(CONFIG_MTD_DB1550_BOOT) && defined(CONFIG_MTD_DB1550_USER)#define DB1550_USER_ONLY#endif#ifdef DB1550_BOTH_BANKS/* both banks will be used. Combine the first bank and the first  * part of the second bank together into a single jffs/jffs2 * partition. */static struct mtd_partition db1550_partitions[] = {	/* assume boot[2:0]:swap is '0000' or '1000', which translates to:	 * 1C00 0000 1FFF FFFF CE0 64MB Boot NOR Flash	 * 1800 0000 1BFF FFFF CE0 64MB Param NOR Flash	 */        {                .name = "User FS",                .size =   (0x1FC00000 - 0x18000000),                .offset = 0x0000000        },{                .name = "yamon",                .size = 0x0100000,		.offset = MTDPART_OFS_APPEND,                .mask_flags = MTD_WRITEABLE        },{                .name = "raw kernel",		.size = (0x300000 - 0x40000), /* last 256KB is yamon env */		.offset = MTDPART_OFS_APPEND,        }};#elif defined(DB1550_BOOT_ONLY)static struct mtd_partition db1550_partitions[] = {	/* assume boot[2:0]:swap is '0000' or '1000', which translates to:	 * 1C00 0000 1FFF FFFF CE0 64MB Boot NOR Flash	 */        {                .name = "User FS",                .size =   0x03c00000,                .offset = 0x0000000        },{                .name = "yamon",                .size = 0x0100000,		.offset = MTDPART_OFS_APPEND,                .mask_flags = MTD_WRITEABLE        },{                .name = "raw kernel",		.size = (0x300000-0x40000), /* last 256KB is yamon env */		.offset = MTDPART_OFS_APPEND,        }};#elif defined(DB1550_USER_ONLY)static struct mtd_partition db1550_partitions[] = {	/* assume boot[2:0]:swap is '0000' or '1000', which translates to:	 * 1800 0000 1BFF FFFF CE0 64MB Param NOR Flash	 */        {                .name = "User FS",                .size = (0x4000000 - 0x200000), /* reserve 2MB for raw kernel */                .offset = 0x0000000        },{                .name = "raw kernel",		.size = MTDPART_SIZ_FULL,		.offset = MTDPART_OFS_APPEND,        }};#else#error MTD_DB1550 define combo error /* should never happen */#endif#define NB_OF(x)  (sizeof(x)/sizeof(x[0]))static struct mtd_info *mymtd;/* * Probe the flash density and setup window address and size * based on user CONFIG options. There are times when we don't * want the MTD driver to be probing the boot or user flash, * so having the option to enable only one bank is important. */int setup_flash_params(void){#if defined(DB1550_BOTH_BANKS)			window_addr = 0x18000000;			window_size = 0x8000000; #elif defined(DB1550_BOOT_ONLY)			window_addr = 0x1C000000;			window_size = 0x4000000; #else /* USER ONLY */			window_addr = 0x1E000000;			window_size = 0x4000000; #endif	return 0;}int __init db1550_mtd_init(void){	struct mtd_partition *parts;	int nb_parts = 0;		/* Default flash bankwidth */	db1550_map.bankwidth = flash_bankwidth;	if (setup_flash_params()) 		return -ENXIO;	/*	 * Static partition definition selection	 */	parts = db1550_partitions;	nb_parts = NB_OF(db1550_partitions);	db1550_map.size = window_size;	/*	 * Now let's probe for the actual flash.  Do it here since	 * specific machine settings might have been set above.	 */	printk(KERN_NOTICE "Pb1550 flash: probing %d-bit flash bus\n", 			db1550_map.bankwidth*8);	db1550_map.virt = 		(unsigned long)ioremap(window_addr, window_size);	mymtd = do_map_probe("cfi_probe", &db1550_map);	if (!mymtd) return -ENXIO;	mymtd->owner = THIS_MODULE;	add_mtd_partitions(mymtd, parts, nb_parts);	return 0;}static void __exit db1550_mtd_cleanup(void){	if (mymtd) {		del_mtd_partitions(mymtd);		map_destroy(mymtd);	}}module_init(db1550_mtd_init);module_exit(db1550_mtd_cleanup);MODULE_AUTHOR("Embedded Edge, LLC");MODULE_DESCRIPTION("Db1550 mtd map driver");MODULE_LICENSE("GPL");