drivers/mtd/vmax301.c

   1 // $Id: vmax301.c,v 1.13 2000/07/03 10:01:38 dwmw2 Exp $
   2 /* ######################################################################
   3
   4    Tempustech VMAX SBC301 MTD Driver.
   5
   6    The VMAx 301 is a SBC based on . It
   7    comes with three builtin AMD 29F016B flash chips and a socket for SRAM or
   8    more flash. Each unit has it's own 8k mapping into a settable region
   9    (0xD8000). There are two 8k mappings for each MTD, the first is always set
  10    to the lower 8k of the device the second is paged. Writing a 16 bit page
  11    value to anywhere in the first 8k will cause the second 8k to page around.
  12
  13    To boot the device a bios extension must be installed into the first 8k
  14    of flash that is smart enough to copy itself down, page in the rest of
  15    itself and begin executing.
  16
  17    ##################################################################### */
  18
  19 #include <linux/module.h>
  20 #include <linux/malloc.h>
  21 #include <linux/ioport.h>
  22 #include <linux/init.h>
  23 #include <asm/spinlock.h>
  24 #include <asm/io.h>
  25
  26 #include <linux/mtd/map.h>
  27
  28
  29 #define WINDOW_START 0xd8000
  30 #define WINDOW_LENGTH 0x2000
  31 #define WINDOW_SHIFT 25
  32 #define WINDOW_MASK 0x1FFF
  33
  34 /* Actually we could use two spinlocks, but we'd have to have
  35    more private space in the struct map_info. We lose a little
  36    performance like this, but we'd probably lose more by having
  37    the extra indirection from having one of the map->map_priv
  38    fields pointing to yet another private struct.
  39 */
  40 static spinlock_t vmax301_spin = SPIN_LOCK_UNLOCKED;
  41
  42 static void __vmax301_page(struct map_info *map, unsigned long page)
  43 {
  44         writew(page, map->map_priv_2 - WINDOW_LENGTH);
  45         map->map_priv_1 = page;
  46 }
  47
  48 static inline void vmax301_page(struct map_info *map,
  49                                   unsigned long ofs)
  50 {
  51         unsigned long page = (ofs >> WINDOW_SHIFT);
  52         if (map->map_priv_1 != page)
  53                 __vmax301_page(map, page);
  54 }
  55
  56 static __u8 vmax301_read8(struct map_info *map, unsigned long ofs)
  57 {
  58         __u8 ret;
  59         spin_lock(&vmax301_spin);
  60         vmax301_page(map, ofs);
  61         ret = readb(map->map_priv_2 + (ofs & WINDOW_MASK));
  62         spin_unlock(&vmax301_spin);
  63         return ret;
  64 }
  65
  66 static __u16 vmax301_read16(struct map_info *map, unsigned long ofs)
  67 {
  68         __u16 ret;
  69         spin_lock(&vmax301_spin);
  70         vmax301_page(map, ofs);
  71         ret = readw(map->map_priv_2 + (ofs & WINDOW_MASK));
  72         spin_unlock(&vmax301_spin);
  73         return ret;
  74 }
  75
  76 static __u32 vmax301_read32(struct map_info *map, unsigned long ofs)
  77 {
  78         __u32 ret;
  79         spin_lock(&vmax301_spin);
  80         vmax301_page(map, ofs);
  81         ret =  readl(map->map_priv_2 + (ofs & WINDOW_MASK));
  82         spin_unlock(&vmax301_spin);
  83         return ret;
  84 }
  85
  86 static void vmax301_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
  87 {
  88         while(len) {
  89                 unsigned long thislen = len;
  90                 if (len > (WINDOW_LENGTH - (from & WINDOW_MASK)))
  91                         thislen = WINDOW_LENGTH-(from & WINDOW_MASK);
  92                 spin_lock(&vmax301_spin);
  93                 vmax301_page(map, from);
  94                 memcpy_fromio(to, map->map_priv_2 + from, thislen);
  95                 spin_unlock(&vmax301_spin);
  96                 to += thislen;
  97                 from += thislen;
  98                 len -= thislen;
  99         }
 100 }
 101
 102 static void vmax301_write8(struct map_info *map, __u8 d, unsigned long adr)
 103 {
 104         spin_lock(&vmax301_spin);
 105         vmax301_page(map, adr);
 106         writeb(d, map->map_priv_2 + (adr & WINDOW_MASK));
 107         spin_unlock(&vmax301_spin);
 108 }
 109
 110 static void vmax301_write16(struct map_info *map, __u16 d, unsigned long adr)
 111 {
 112         spin_lock(&vmax301_spin);
 113         vmax301_page(map, adr);
 114         writew(d, map->map_priv_2 + (adr & WINDOW_MASK));
 115         spin_unlock(&vmax301_spin);
 116 }
 117
 118 static void vmax301_write32(struct map_info *map, __u32 d, unsigned long adr)
 119 {
 120         spin_lock(&vmax301_spin);
 121         vmax301_page(map, adr);
 122         writel(d, map->map_priv_2 + (adr & WINDOW_MASK));
 123         spin_unlock(&vmax301_spin);
 124 }
 125
 126 static void vmax301_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
 127 {
 128         while(len) {
 129                 unsigned long thislen = len;
 130                 if (len > (WINDOW_LENGTH - (to & WINDOW_MASK)))
 131                         thislen = WINDOW_LENGTH-(to & WINDOW_MASK);
 132
 133                 spin_lock(&vmax301_spin);
 134                 vmax301_page(map, to);
 135                 memcpy_toio(map->map_priv_2 + to, from, thislen);
 136                 spin_unlock(&vmax301_spin);
 137                 to += thislen;
 138                 from += thislen;
 139                 len -= thislen;
 140         }
 141 }
 142
 143 static struct map_info vmax_map[2] = {
 144         {
 145                 "VMAX301 Internal Flash",
 146                 3*2*1024*1024,
 147                 1,
 148                 vmax301_read8,
 149                 vmax301_read16,
 150                 vmax301_read32,
 151                 vmax301_copy_from,
 152                 vmax301_write8,
 153                 vmax301_write16,
 154                 vmax301_write32,
 155                 vmax301_copy_to,
 156                 WINDOW_START + WINDOW_LENGTH,
 157                 0xFFFFFFFF
 158         },
 159         {
 160                 "VMAX301 Socket",
 161                 0,
 162                 1,
 163                 vmax301_read8,
 164                 vmax301_read16,
 165                 vmax301_read32,
 166                 vmax301_copy_from,
 167                 vmax301_write8,
 168                 vmax301_write16,
 169                 vmax301_write32,
 170                 vmax301_copy_to,
 171                 WINDOW_START + (3*WINDOW_LENGTH),
 172                 0xFFFFFFFF
 173         }
 174 };
 175
 176 static struct mtd_info *vmax_mtd[2] = {NULL, NULL};
 177
 178 #if LINUX_VERSION_CODE < 0x20300
 179 #ifdef MODULE
 180 #define init_vmax301 init_module
 181 #define cleanup_vmax301 cleanup_module
 182 #endif
 183 #define __exit
 184 #endif
 185
 186 static void __exit cleanup_vmax301(void)
 187 {
 188         int i;
 189
 190         for (i=0; i<2; i++) {
 191                 if (vmax_mtd[i]) {
 192                         del_mtd_device(vmax_mtd[i]);
 193                         map_destroy(vmax_mtd[i]);
 194                 }
 195         }
 196         iounmap((void *)vmax_map[0].map_priv_1 - WINDOW_START);
 197 }
 198
 199 int __init init_vmax301(void)
 200 {
 201         int i;
 202         unsigned long iomapadr;
 203         // Print out our little header..
 204         printk("Tempustech VMAX 301 MEM:0x%x-0x%x\n",WINDOW_START,
 205                WINDOW_START+4*WINDOW_LENGTH);
 206
 207         iomapadr = (unsigned long)ioremap(WINDOW_START, WINDOW_LENGTH*4);
 208         if (!iomapadr) {
 209                 printk("Failed to ioremap memory region\n");
 210                 return -EIO;
 211         }
 212         /* Put the address in the map's private data area.
 213            We store the actual MTD IO address rather than the
 214            address of the first half, because it's used more
 215            often.
 216         */
 217         vmax_map[0].map_priv_1 = iomapadr + WINDOW_START;
 218         vmax_map[1].map_priv_1 = iomapadr + (3*WINDOW_START);
 219
 220         for (i=0; i<2; i++) {
 221                 vmax_mtd[i] = do_cfi_probe(&vmax_map[i]);
 222                 if (!vmax_mtd[i])
 223                         vmax_mtd[i] = do_jedec_probe(&vmax_map[i]);
 224                 if (!vmax_mtd[i])
 225                         vmax_mtd[i] = do_ram_probe(&vmax_map[i]);
 226                 if (!vmax_mtd[i])
 227                         vmax_mtd[i] = do_rom_probe(&vmax_map[i]);
 228                 if (vmax_mtd[i]) {
 229                         vmax_mtd[i]->module = THIS_MODULE;
 230                         add_mtd_device(vmax_mtd[i]);
 231                 }
 232         }
 233
 234         if (!vmax_mtd[1] && !vmax_mtd[2])
 235                 return -ENXIO;
 236
 237         return 0;
 238 }
 239
 240 #if LINUX_VERSION_CODE > 0x20300
 241 module_init(init_vmax301);
 242 module_exit(cleanup_vmax301);
 243 #endif