1/* 2 * Handle mapping of the flash memory access routines 3 * on TQM8xxL based devices. 4 * 5 * $Id: tqm8xxl.c,v 1.1.1.1 2007/08/03 18:52:44 Exp $ 6 * 7 * based on rpxlite.c 8 * 9 * Copyright(C) 2001 Kirk Lee <kirk@hpc.ee.ntu.edu.tw> 10 * 11 * This code is GPLed 12 * 13 */ 14 15/* 16 * According to TQM8xxL hardware manual, TQM8xxL series have 17 * following flash memory organisations: 18 * | capacity | | chip type | | bank0 | | bank1 | 19 * 2MiB 512Kx16 2MiB 0 20 * 4MiB 1Mx16 4MiB 0 21 * 8MiB 1Mx16 4MiB 4MiB 22 * Thus, we choose CONFIG_MTD_CFI_I2 & CONFIG_MTD_CFI_B4 at 23 * kernel configuration. 24 */ 25#include <linux/module.h> 26#include <linux/types.h> 27#include <linux/kernel.h> 28#include <linux/init.h> 29#include <linux/slab.h> 30 31#include <linux/mtd/mtd.h> 32#include <linux/mtd/map.h> 33#include <linux/mtd/partitions.h> 34 35#include <asm/io.h> 36 37#define FLASH_ADDR 0x40000000 38#define FLASH_SIZE 0x00800000 39#define FLASH_BANK_MAX 4 40 41// trivial struct to describe partition information 42struct mtd_part_def 43{ 44 int nums; 45 unsigned char *type; 46 struct mtd_partition* mtd_part; 47}; 48 49//static struct mtd_info *mymtd; 50static struct mtd_info* mtd_banks[FLASH_BANK_MAX]; 51static struct map_info* map_banks[FLASH_BANK_MAX]; 52static struct mtd_part_def part_banks[FLASH_BANK_MAX]; 53static unsigned long num_banks; 54static void __iomem *start_scan_addr; 55 56/* 57 * Here are partition information for all known TQM8xxL series devices. 58 * See include/linux/mtd/partitions.h for definition of the mtd_partition 59 * structure. 60 * 61 * The *_max_flash_size is the maximum possible mapped flash size which 62 * is not necessarily the actual flash size. It must correspond to the 63 * value specified in the mapping definition defined by the 64 * "struct map_desc *_io_desc" for the corresponding machine. 65 */ 66 67#ifdef CONFIG_MTD_PARTITIONS 68/* Currently, TQM8xxL has upto 8MiB flash */ 69static unsigned long tqm8xxl_max_flash_size = 0x00800000; 70 71/* partition definition for first flash bank 72 * (cf. "drivers/char/flash_config.c") 73 */ 74static struct mtd_partition tqm8xxl_partitions[] = { 75 { 76 .name = "ppcboot", 77 .offset = 0x00000000, 78 .size = 0x00020000, /* 128KB */ 79 .mask_flags = MTD_WRITEABLE, /* force read-only */ 80 }, 81 { 82 .name = "kernel", /* default kernel image */ 83 .offset = 0x00020000, 84 .size = 0x000e0000, 85 .mask_flags = MTD_WRITEABLE, /* force read-only */ 86 }, 87 { 88 .name = "user", 89 .offset = 0x00100000, 90 .size = 0x00100000, 91 }, 92 { 93 .name = "initrd", 94 .offset = 0x00200000, 95 .size = 0x00200000, 96 } 97}; 98/* partition definition for second flash bank */ 99static struct mtd_partition tqm8xxl_fs_partitions[] = { 100 { 101 .name = "cramfs", 102 .offset = 0x00000000, 103 .size = 0x00200000, 104 }, 105 { 106 .name = "jffs", 107 .offset = 0x00200000, 108 .size = 0x00200000, 109 //.size = MTDPART_SIZ_FULL, 110 } 111}; 112#endif 113 114int __init init_tqm_mtd(void) 115{ 116 int idx = 0, ret = 0; 117 unsigned long flash_addr, flash_size, mtd_size = 0; 118 /* pointer to TQM8xxL board info data */ 119 bd_t *bd = (bd_t *)__res; 120 121 flash_addr = bd->bi_flashstart; 122 flash_size = bd->bi_flashsize; 123 124 //request maximum flash size address space 125 start_scan_addr = ioremap(flash_addr, flash_size); 126 if (!start_scan_addr) { 127 printk(KERN_WARNING "%s:Failed to ioremap address:0x%x\n", __FUNCTION__, flash_addr); 128 return -EIO; 129 } 130 131 for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) { 132 if(mtd_size >= flash_size) 133 break; 134 135 printk(KERN_INFO "%s: chip probing count %d\n", __FUNCTION__, idx); 136 137 map_banks[idx] = kzalloc(sizeof(struct map_info), GFP_KERNEL); 138 if(map_banks[idx] == NULL) { 139 ret = -ENOMEM; 140 goto error_mem; 141 } 142 143 map_banks[idx]->name = (char *)kmalloc(16, GFP_KERNEL); 144 145 if (!map_banks[idx]->name) { 146 ret = -ENOMEM; 147 goto error_mem; 148 } 149 sprintf(map_banks[idx]->name, "TQM8xxL%d", idx); 150 151 map_banks[idx]->size = flash_size; 152 map_banks[idx]->bankwidth = 4; 153 154 simple_map_init(map_banks[idx]); 155 156 map_banks[idx]->virt = start_scan_addr; 157 map_banks[idx]->phys = flash_addr; 158 159 if (idx && mtd_banks[idx-1]) { 160 map_banks[idx]->virt += mtd_banks[idx-1]->size; 161 map_banks[idx]->phys += mtd_banks[idx-1]->size; 162 } 163 164 //start to probe flash chips 165 mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]); 166 167 if (mtd_banks[idx]) { 168 mtd_banks[idx]->owner = THIS_MODULE; 169 mtd_size += mtd_banks[idx]->size; 170 num_banks++; 171 172 printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __FUNCTION__, num_banks, 173 mtd_banks[idx]->name, mtd_banks[idx]->size); 174 } 175 } 176 177 /* no supported flash chips found */ 178 if (!num_banks) { 179 printk(KERN_NOTICE "TQM8xxL: No support flash chips found!\n"); 180 ret = -ENXIO; 181 goto error_mem; 182 } 183 184#ifdef CONFIG_MTD_PARTITIONS 185 /* 186 * Select Static partition definitions 187 */ 188 part_banks[0].mtd_part = tqm8xxl_partitions; 189 part_banks[0].type = "Static image"; 190 part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions); 191 192 part_banks[1].mtd_part = tqm8xxl_fs_partitions; 193 part_banks[1].type = "Static file system"; 194 part_banks[1].nums = ARRAY_SIZE(tqm8xxl_fs_partitions); 195 196 for(idx = 0; idx < num_banks ; idx++) { 197 if (part_banks[idx].nums == 0) { 198 printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx); 199 add_mtd_device(mtd_banks[idx]); 200 } else { 201 printk(KERN_NOTICE "TQM flash%d: Using %s partition definition\n", 202 idx, part_banks[idx].type); 203 add_mtd_partitions(mtd_banks[idx], part_banks[idx].mtd_part, 204 part_banks[idx].nums); 205 } 206 } 207#else 208 printk(KERN_NOTICE "TQM flash: registering %d whole flash banks at once\n", num_banks); 209 for(idx = 0 ; idx < num_banks ; idx++) 210 add_mtd_device(mtd_banks[idx]); 211#endif 212 return 0; 213error_mem: 214 for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) { 215 if(map_banks[idx] != NULL) { 216 kfree(map_banks[idx]->name); 217 map_banks[idx]->name = NULL; 218 kfree(map_banks[idx]); 219 map_banks[idx] = NULL; 220 } 221 } 222error: 223 iounmap(start_scan_addr); 224 return ret; 225} 226 227static void __exit cleanup_tqm_mtd(void) 228{ 229 unsigned int idx = 0; 230 for(idx = 0 ; idx < num_banks ; idx++) { 231 /* destroy mtd_info previously allocated */ 232 if (mtd_banks[idx]) { 233 del_mtd_partitions(mtd_banks[idx]); 234 map_destroy(mtd_banks[idx]); 235 } 236 /* release map_info not used anymore */ 237 kfree(map_banks[idx]->name); 238 kfree(map_banks[idx]); 239 } 240 241 if (start_scan_addr) { 242 iounmap(start_scan_addr); 243 start_scan_addr = 0; 244 } 245} 246 247module_init(init_tqm_mtd); 248module_exit(cleanup_tqm_mtd); 249 250MODULE_LICENSE("GPL"); 251MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>"); 252MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards"); 253