drivers/mtd/maps/tqm8xxl.c

   1 /*
   2  * Handle mapping of the flash memory access routines
   3  * on TQM8xxL based devices.
   4  *
   5  * based on rpxlite.c
   6  *
   7  * Copyright(C) 2001 Kirk Lee <kirk@hpc.ee.ntu.edu.tw>
   8  *
   9  * This code is GPLed
  10  *
  11  */
  12
  13 /*
  14  * According to TQM8xxL hardware manual, TQM8xxL series have
  15  * following flash memory organisations:
  16  *      | capacity |    | chip type |   | bank0 |       | bank1 |
  17  *          2MiB           512Kx16        2MiB             0
  18  *          4MiB           1Mx16          4MiB             0
  19  *          8MiB           1Mx16          4MiB             4MiB
  20  * Thus, we choose CONFIG_MTD_CFI_I2 & CONFIG_MTD_CFI_B4 at
  21  * kernel configuration.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/types.h>
  25 #include <linux/kernel.h>
  26 #include <linux/init.h>
  27 #include <linux/slab.h>
  28
  29 #include <linux/mtd/mtd.h>
  30 #include <linux/mtd/map.h>
  31 #include <linux/mtd/partitions.h>
  32
  33 #include <asm/io.h>
  34
  35 #define FLASH_ADDR 0x40000000
  36 #define FLASH_SIZE 0x00800000
  37 #define FLASH_BANK_MAX 4
  38
  39 // trivial struct to describe partition information
  40 struct mtd_part_def
  41 {
  42         int nums;
  43         unsigned char *type;
  44         struct mtd_partition* mtd_part;
  45 };
  46
  47 //static struct mtd_info *mymtd;
  48 static struct mtd_info* mtd_banks[FLASH_BANK_MAX];
  49 static struct map_info* map_banks[FLASH_BANK_MAX];
  50 static struct mtd_part_def part_banks[FLASH_BANK_MAX];
  51 static unsigned long num_banks;
  52 static void __iomem *start_scan_addr;
  53
  54 /*
  55  * Here are partition information for all known TQM8xxL series devices.
  56  * See include/linux/mtd/partitions.h for definition of the mtd_partition
  57  * structure.
  58  *
  59  * The *_max_flash_size is the maximum possible mapped flash size which
  60  * is not necessarily the actual flash size.  It must correspond to the
  61  * value specified in the mapping definition defined by the
  62  * "struct map_desc *_io_desc" for the corresponding machine.
  63  */
  64
  65 /* Currently, TQM8xxL has up to 8MiB flash */
  66 static unsigned long tqm8xxl_max_flash_size = 0x00800000;
  67
  68 /* partition definition for first flash bank
  69  * (cf. "drivers/char/flash_config.c")
  70  */
  71 static struct mtd_partition tqm8xxl_partitions[] = {
  72         {
  73           .name = "ppcboot",
  74           .offset = 0x00000000,
  75           .size = 0x00020000,           /* 128KB           */
  76           .mask_flags = MTD_WRITEABLE,  /* force read-only */
  77         },
  78         {
  79           .name = "kernel",             /* default kernel image */
  80           .offset = 0x00020000,
  81           .size = 0x000e0000,
  82           .mask_flags = MTD_WRITEABLE,  /* force read-only */
  83         },
  84         {
  85           .name = "user",
  86           .offset = 0x00100000,
  87           .size = 0x00100000,
  88         },
  89         {
  90           .name = "initrd",
  91           .offset = 0x00200000,
  92           .size = 0x00200000,
  93         }
  94 };
  95 /* partition definition for second flash bank */
  96 static struct mtd_partition tqm8xxl_fs_partitions[] = {
  97         {
  98           .name = "cramfs",
  99           .offset = 0x00000000,
 100           .size = 0x00200000,
 101         },
 102         {
 103           .name = "jffs",
 104           .offset = 0x00200000,
 105           .size = 0x00200000,
 106           //.size = MTDPART_SIZ_FULL,
 107         }
 108 };
 109
 110 static int __init init_tqm_mtd(void)
 111 {
 112         int idx = 0, ret = 0;
 113         unsigned long flash_addr, flash_size, mtd_size = 0;
 114         /* pointer to TQM8xxL board info data */
 115         bd_t *bd = (bd_t *)__res;
 116
 117         flash_addr = bd->bi_flashstart;
 118         flash_size = bd->bi_flashsize;
 119
 120         //request maximum flash size address space
 121         start_scan_addr = ioremap(flash_addr, flash_size);
 122         if (!start_scan_addr) {
 123                 printk(KERN_WARNING "%s:Failed to ioremap address:0x%x\n", __func__, flash_addr);
 124                 return -EIO;
 125         }
 126
 127         for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
 128                 if(mtd_size >= flash_size)
 129                         break;
 130
 131                 printk(KERN_INFO "%s: chip probing count %d\n", __func__, idx);
 132
 133                 map_banks[idx] = kzalloc(sizeof(struct map_info), GFP_KERNEL);
 134                 if(map_banks[idx] == NULL) {
 135                         ret = -ENOMEM;
 136                         /* FIXME: What if some MTD devices were probed already? */
 137                         goto error_mem;
 138                 }
 139
 140                 map_banks[idx]->name = kmalloc(16, GFP_KERNEL);
 141
 142                 if (!map_banks[idx]->name) {
 143                         ret = -ENOMEM;
 144                         /* FIXME: What if some MTD devices were probed already? */
 145                         goto error_mem;
 146                 }
 147                 sprintf(map_banks[idx]->name, "TQM8xxL%d", idx);
 148
 149                 map_banks[idx]->size = flash_size;
 150                 map_banks[idx]->bankwidth = 4;
 151
 152                 simple_map_init(map_banks[idx]);
 153
 154                 map_banks[idx]->virt = start_scan_addr;
 155                 map_banks[idx]->phys = flash_addr;
 156                 /* FIXME: This looks utterly bogus, but I'm trying to
 157                    preserve the behaviour of the original (shown here)...
 158
 159                 map_banks[idx]->map_priv_1 =
 160                 start_scan_addr + ((idx > 0) ?
 161                 (mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0);
 162                 */
 163
 164                 if (idx && mtd_banks[idx-1]) {
 165                         map_banks[idx]->virt += mtd_banks[idx-1]->size;
 166                         map_banks[idx]->phys += mtd_banks[idx-1]->size;
 167                 }
 168
 169                 //start to probe flash chips
 170                 mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]);
 171
 172                 if (mtd_banks[idx]) {
 173                         mtd_banks[idx]->owner = THIS_MODULE;
 174                         mtd_size += mtd_banks[idx]->size;
 175                         num_banks++;
 176
 177                         printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __func__, num_banks,
 178                         mtd_banks[idx]->name, mtd_banks[idx]->size);
 179                 }
 180         }
 181
 182         /* no supported flash chips found */
 183         if (!num_banks) {
 184                 printk(KERN_NOTICE "TQM8xxL: No support flash chips found!\n");
 185                 ret = -ENXIO;
 186                 goto error_mem;
 187         }
 188
 189         /*
 190          * Select Static partition definitions
 191          */
 192         part_banks[0].mtd_part = tqm8xxl_partitions;
 193         part_banks[0].type = "Static image";
 194         part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions);
 195
 196         part_banks[1].mtd_part = tqm8xxl_fs_partitions;
 197         part_banks[1].type = "Static file system";
 198         part_banks[1].nums = ARRAY_SIZE(tqm8xxl_fs_partitions);
 199
 200         for(idx = 0; idx < num_banks ; idx++) {
 201                 if (part_banks[idx].nums == 0)
 202                         printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx);
 203                 else
 204                         printk(KERN_NOTICE "TQM flash%d: Using %s partition definition\n",
 205                                         idx, part_banks[idx].type);
 206                 mtd_device_register(mtd_banks[idx], part_banks[idx].mtd_part,
 207                 part_banks[idx].nums);
 208         }
 209         return 0;
 210 error_mem:
 211         for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
 212                 if(map_banks[idx] != NULL) {
 213                         kfree(map_banks[idx]->name);
 214                         map_banks[idx]->name = NULL;
 215                         kfree(map_banks[idx]);
 216                         map_banks[idx] = NULL;
 217                 }
 218         }
 219 error:
 220         iounmap(start_scan_addr);
 221         return ret;
 222 }
 223
 224 static void __exit cleanup_tqm_mtd(void)
 225 {
 226         unsigned int idx = 0;
 227         for(idx = 0 ; idx < num_banks ; idx++) {
 228                 /* destroy mtd_info previously allocated */
 229                 if (mtd_banks[idx]) {
 230                         mtd_device_unregister(mtd_banks[idx]);
 231                         map_destroy(mtd_banks[idx]);
 232                 }
 233                 /* release map_info not used anymore */
 234                 kfree(map_banks[idx]->name);
 235                 kfree(map_banks[idx]);
 236         }
 237
 238         if (start_scan_addr) {
 239                 iounmap(start_scan_addr);
 240                 start_scan_addr = 0;
 241         }
 242 }
 243
 244 module_init(init_tqm_mtd);
 245 module_exit(cleanup_tqm_mtd);
 246
 247 MODULE_LICENSE("GPL");
 248 MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>");
 249 MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards");