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   1 /*
   2  * Handle mapping of the flash memory access routines
   3  * on TQM8xxL based devices.
   4  *
   5  * $Id: tqm8xxl.c,v 1.13 2004/10/20 22:21:53 dwmw2 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/config.h>
  26 #include <linux/module.h>
  27 #include <linux/types.h>
  28 #include <linux/kernel.h>
  29 #include <linux/init.h>
  30 #include <linux/slab.h>
  31
  32 #include <linux/mtd/mtd.h>
  33 #include <linux/mtd/map.h>
  34 #include <linux/mtd/partitions.h>
  35
  36 #include <asm/io.h>
  37
  38 #define FLASH_ADDR 0x40000000
  39 #define FLASH_SIZE 0x00800000
  40 #define FLASH_BANK_MAX 4
  41
  42 // trivial struct to describe partition information
  43 struct mtd_part_def
  44 {
  45         int nums;
  46         unsigned char *type;
  47         struct mtd_partition* mtd_part;
  48 };
  49
  50 //static struct mtd_info *mymtd;
  51 static struct mtd_info* mtd_banks[FLASH_BANK_MAX];
  52 static struct map_info* map_banks[FLASH_BANK_MAX];
  53 static struct mtd_part_def part_banks[FLASH_BANK_MAX];
  54 static unsigned long num_banks;
  55 static void __iomem *start_scan_addr;
  56
  57 /*
  58  * Here are partition information for all known TQM8xxL series devices.
  59  * See include/linux/mtd/partitions.h for definition of the mtd_partition
  60  * structure.
  61  *
  62  * The *_max_flash_size is the maximum possible mapped flash size which
  63  * is not necessarily the actual flash size.  It must correspond to the
  64  * value specified in the mapping definition defined by the
  65  * "struct map_desc *_io_desc" for the corresponding machine.
  66  */
  67
  68 #ifdef CONFIG_MTD_PARTITIONS
  69 /* Currently, TQM8xxL has upto 8MiB flash */
  70 static unsigned long tqm8xxl_max_flash_size = 0x00800000;
  71
  72 /* partition definition for first flash bank
  73  * (cf. "drivers/char/flash_config.c")
  74  */
  75 static struct mtd_partition tqm8xxl_partitions[] = {
  76         {
  77           .name = "ppcboot",
  78           .offset = 0x00000000,
  79           .size = 0x00020000,           /* 128KB           */
  80           .mask_flags = MTD_WRITEABLE,  /* force read-only */
  81         },
  82         {
  83           .name = "kernel",             /* default kernel image */
  84           .offset = 0x00020000,
  85           .size = 0x000e0000,
  86           .mask_flags = MTD_WRITEABLE,  /* force read-only */
  87         },
  88         {
  89           .name = "user",
  90           .offset = 0x00100000,
  91           .size = 0x00100000,
  92         },
  93         {
  94           .name = "initrd",
  95           .offset = 0x00200000,
  96           .size = 0x00200000,
  97         }
  98 };
  99 /* partition definition for second flash bank */
 100 static struct mtd_partition tqm8xxl_fs_partitions[] = {
 101         {
 102           .name = "cramfs",
 103           .offset = 0x00000000,
 104           .size = 0x00200000,
 105         },
 106         {
 107           .name = "jffs",
 108           .offset = 0x00200000,
 109           .size = 0x00200000,
 110           //.size = MTDPART_SIZ_FULL,
 111         }
 112 };
 113 #endif
 114
 115 int __init init_tqm_mtd(void)
 116 {
 117         int idx = 0, ret = 0;
 118         unsigned long flash_addr, flash_size, mtd_size = 0;
 119         /* pointer to TQM8xxL board info data */
 120         bd_t *bd = (bd_t *)__res;
 121
 122         flash_addr = bd->bi_flashstart;
 123         flash_size = bd->bi_flashsize;
 124
 125         //request maximum flash size address space
 126         start_scan_addr = ioremap(flash_addr, flash_size);
 127         if (!start_scan_addr) {
 128                 printk(KERN_WARNING "%s:Failed to ioremap address:0x%x\n", __FUNCTION__, flash_addr);
 129                 return -EIO;
 130         }
 131
 132         for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
 133                 if(mtd_size >= flash_size)
 134                         break;
 135
 136                 printk(KERN_INFO "%s: chip probing count %d\n", __FUNCTION__, idx);
 137
 138                 map_banks[idx] = (struct map_info *)kmalloc(sizeof(struct map_info), GFP_KERNEL);
 139                 if(map_banks[idx] == NULL) {
 140                         ret = -ENOMEM;
 141                         /* FIXME: What if some MTD devices were probed already? */
 142                         goto error_mem;
 143                 }
 144
 145                 memset((void *)map_banks[idx], 0, sizeof(struct map_info));
 146                 map_banks[idx]->name = (char *)kmalloc(16, GFP_KERNEL);
 147
 148                 if (!map_banks[idx]->name) {
 149                         ret = -ENOMEM;
 150                         /* FIXME: What if some MTD devices were probed already? */
 151                         goto error_mem;
 152                 }
 153                 sprintf(map_banks[idx]->name, "TQM8xxL%d", idx);
 154
 155                 map_banks[idx]->size = flash_size;
 156                 map_banks[idx]->bankwidth = 4;
 157
 158                 simple_map_init(map_banks[idx]);
 159
 160                 map_banks[idx]->virt = start_scan_addr;
 161                 map_banks[idx]->phys = flash_addr;
 162                 /* FIXME: This looks utterly bogus, but I'm trying to
 163                    preserve the behaviour of the original (shown here)...
 164
 165                 map_banks[idx]->map_priv_1 =
 166                 start_scan_addr + ((idx > 0) ?
 167                 (mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0);
 168                 */
 169
 170                 if (idx && mtd_banks[idx-1]) {
 171                         map_banks[idx]->virt += mtd_banks[idx-1]->size;
 172                         map_banks[idx]->phys += mtd_banks[idx-1]->size;
 173                 }
 174
 175                 //start to probe flash chips
 176                 mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]);
 177
 178                 if (mtd_banks[idx]) {
 179                         mtd_banks[idx]->owner = THIS_MODULE;
 180                         mtd_size += mtd_banks[idx]->size;
 181                         num_banks++;
 182
 183                         printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __FUNCTION__, num_banks,
 184                         mtd_banks[idx]->name, mtd_banks[idx]->size);
 185                 }
 186         }
 187
 188         /* no supported flash chips found */
 189         if (!num_banks) {
 190                 printk(KERN_NOTICE "TQM8xxL: No support flash chips found!\n");
 191                 ret = -ENXIO;
 192                 goto error_mem;
 193         }
 194
 195 #ifdef CONFIG_MTD_PARTITIONS
 196         /*
 197          * Select Static partition definitions
 198          */
 199         part_banks[0].mtd_part = tqm8xxl_partitions;
 200         part_banks[0].type = "Static image";
 201         part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions);
 202
 203         part_banks[1].mtd_part = tqm8xxl_fs_partitions;
 204         part_banks[1].type = "Static file system";
 205         part_banks[1].nums = ARRAY_SIZE(tqm8xxl_fs_partitions);
 206
 207         for(idx = 0; idx < num_banks ; idx++) {
 208                 if (part_banks[idx].nums == 0) {
 209                         printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx);
 210                         add_mtd_device(mtd_banks[idx]);
 211                 } else {
 212                         printk(KERN_NOTICE "TQM flash%d: Using %s partition definition\n",
 213                                         idx, part_banks[idx].type);
 214                         add_mtd_partitions(mtd_banks[idx], part_banks[idx].mtd_part,
 215                                                                 part_banks[idx].nums);
 216                 }
 217         }
 218 #else
 219         printk(KERN_NOTICE "TQM flash: registering %d whole flash banks at once\n", num_banks);
 220         for(idx = 0 ; idx < num_banks ; idx++)
 221                 add_mtd_device(mtd_banks[idx]);
 222 #endif
 223         return 0;
 224 error_mem:
 225         for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
 226                 if(map_banks[idx] != NULL) {
 227                         if(map_banks[idx]->name != NULL) {
 228                                 kfree(map_banks[idx]->name);
 229                                 map_banks[idx]->name = NULL;
 230                         }
 231                         kfree(map_banks[idx]);
 232                         map_banks[idx] = NULL;
 233                 }
 234         }
 235 error:
 236         iounmap(start_scan_addr);
 237         return ret;
 238 }
 239
 240 static void __exit cleanup_tqm_mtd(void)
 241 {
 242         unsigned int idx = 0;
 243         for(idx = 0 ; idx < num_banks ; idx++) {
 244                 /* destroy mtd_info previously allocated */
 245                 if (mtd_banks[idx]) {
 246                         del_mtd_partitions(mtd_banks[idx]);
 247                         map_destroy(mtd_banks[idx]);
 248                 }
 249                 /* release map_info not used anymore */
 250                 kfree(map_banks[idx]->name);
 251                 kfree(map_banks[idx]);
 252         }
 253
 254         if (start_scan_addr) {
 255                 iounmap(start_scan_addr);
 256                 start_scan_addr = 0;
 257         }
 258 }
 259
 260 module_init(init_tqm_mtd);
 261 module_exit(cleanup_tqm_mtd);
 262
 263 MODULE_LICENSE("GPL");
 264 MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>");
 265 MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards");