/* * Handle mapping of the flash memory access routines * on TQM8xxL based devices. * * $Id: tqm8xxl.c,v 1.15 2005/11/07 11:14:28 gleixner 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) { 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");