drivers/bcma/driver_chipcommon_sflash.c

   1 /*
   2  * Broadcom specific AMBA
   3  * ChipCommon serial flash interface
   4  *
   5  * Licensed under the GNU/GPL. See COPYING for details.
   6  */
   7
   8 #include "bcma_private.h"
   9
  10 #include <linux/platform_device.h>
  11 #include <linux/bcma/bcma.h>
  12
  13 static struct resource bcma_sflash_resource = {
  14         .name   = "bcma_sflash",
  15         .start  = BCMA_SOC_FLASH2,
  16         .end    = 0,
  17         .flags  = IORESOURCE_MEM | IORESOURCE_READONLY,
  18 };
  19
  20 struct platform_device bcma_sflash_dev = {
  21         .name           = "bcma_sflash",
  22         .resource       = &bcma_sflash_resource,
  23         .num_resources  = 1,
  24 };
  25
  26 struct bcma_sflash_tbl_e {
  27         char *name;
  28         u32 id;
  29         u32 blocksize;
  30         u16 numblocks;
  31 };
  32
  33 static const struct bcma_sflash_tbl_e bcma_sflash_st_tbl[] = {
  34         { "M25P20", 0x11, 0x10000, 4, },
  35         { "M25P40", 0x12, 0x10000, 8, },
  36
  37         { "M25P16", 0x14, 0x10000, 32, },
  38         { "M25P32", 0x15, 0x10000, 64, },
  39         { "M25P64", 0x16, 0x10000, 128, },
  40         { "M25FL128", 0x17, 0x10000, 256, },
  41         { NULL },
  42 };
  43
  44 static const struct bcma_sflash_tbl_e bcma_sflash_sst_tbl[] = {
  45         { "SST25WF512", 1, 0x1000, 16, },
  46         { "SST25VF512", 0x48, 0x1000, 16, },
  47         { "SST25WF010", 2, 0x1000, 32, },
  48         { "SST25VF010", 0x49, 0x1000, 32, },
  49         { "SST25WF020", 3, 0x1000, 64, },
  50         { "SST25VF020", 0x43, 0x1000, 64, },
  51         { "SST25WF040", 4, 0x1000, 128, },
  52         { "SST25VF040", 0x44, 0x1000, 128, },
  53         { "SST25VF040B", 0x8d, 0x1000, 128, },
  54         { "SST25WF080", 5, 0x1000, 256, },
  55         { "SST25VF080B", 0x8e, 0x1000, 256, },
  56         { "SST25VF016", 0x41, 0x1000, 512, },
  57         { "SST25VF032", 0x4a, 0x1000, 1024, },
  58         { "SST25VF064", 0x4b, 0x1000, 2048, },
  59         { NULL },
  60 };
  61
  62 static const struct bcma_sflash_tbl_e bcma_sflash_at_tbl[] = {
  63         { "AT45DB011", 0xc, 256, 512, },
  64         { "AT45DB021", 0x14, 256, 1024, },
  65         { "AT45DB041", 0x1c, 256, 2048, },
  66         { "AT45DB081", 0x24, 256, 4096, },
  67         { "AT45DB161", 0x2c, 512, 4096, },
  68         { "AT45DB321", 0x34, 512, 8192, },
  69         { "AT45DB642", 0x3c, 1024, 8192, },
  70         { NULL },
  71 };
  72
  73 static void bcma_sflash_cmd(struct bcma_drv_cc *cc, u32 opcode)
  74 {
  75         int i;
  76         bcma_cc_write32(cc, BCMA_CC_FLASHCTL,
  77                         BCMA_CC_FLASHCTL_START | opcode);
  78         for (i = 0; i < 1000; i++) {
  79                 if (!(bcma_cc_read32(cc, BCMA_CC_FLASHCTL) &
  80                       BCMA_CC_FLASHCTL_BUSY))
  81                         return;
  82                 cpu_relax();
  83         }
  84         bcma_err(cc->core->bus, "SFLASH control command failed (timeout)!\n");
  85 }
  86
  87 /* Initialize serial flash access */
  88 int bcma_sflash_init(struct bcma_drv_cc *cc)
  89 {
  90         struct bcma_bus *bus = cc->core->bus;
  91         struct bcma_sflash *sflash = &cc->sflash;
  92         const struct bcma_sflash_tbl_e *e;
  93         u32 id, id2;
  94
  95         switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
  96         case BCMA_CC_FLASHT_STSER:
  97                 bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_DP);
  98
  99                 bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 0);
 100                 bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
 101                 id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
 102
 103                 bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 1);
 104                 bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
 105                 id2 = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
 106
 107                 switch (id) {
 108                 case 0xbf:
 109                         for (e = bcma_sflash_sst_tbl; e->name; e++) {
 110                                 if (e->id == id2)
 111                                         break;
 112                         }
 113                         break;
 114                 case 0x13:
 115                         return -ENOTSUPP;
 116                 default:
 117                         for (e = bcma_sflash_st_tbl; e->name; e++) {
 118                                 if (e->id == id)
 119                                         break;
 120                         }
 121                         break;
 122                 }
 123                 if (!e->name) {
 124                         bcma_err(bus, "Unsupported ST serial flash (id: 0x%X, id2: 0x%X)\n", id, id2);
 125                         return -ENOTSUPP;
 126                 }
 127
 128                 break;
 129         case BCMA_CC_FLASHT_ATSER:
 130                 bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_STATUS);
 131                 id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA) & 0x3c;
 132
 133                 for (e = bcma_sflash_at_tbl; e->name; e++) {
 134                         if (e->id == id)
 135                                 break;
 136                 }
 137                 if (!e->name) {
 138                         bcma_err(bus, "Unsupported Atmel serial flash (id: 0x%X)\n", id);
 139                         return -ENOTSUPP;
 140                 }
 141
 142                 break;
 143         default:
 144                 bcma_err(bus, "Unsupported flash type\n");
 145                 return -ENOTSUPP;
 146         }
 147
 148         sflash->window = BCMA_SOC_FLASH2;
 149         sflash->blocksize = e->blocksize;
 150         sflash->numblocks = e->numblocks;
 151         sflash->size = sflash->blocksize * sflash->numblocks;
 152         sflash->present = true;
 153
 154         bcma_info(bus, "Found %s serial flash (size: %dKiB, blocksize: 0x%X, blocks: %d)\n",
 155                   e->name, sflash->size / 1024, sflash->blocksize,
 156                   sflash->numblocks);
 157
 158         /* Prepare platform device, but don't register it yet. It's too early,
 159          * malloc (required by device_private_init) is not available yet. */
 160         bcma_sflash_dev.resource[0].end = bcma_sflash_dev.resource[0].start +
 161                                           sflash->size;
 162         bcma_sflash_dev.dev.platform_data = sflash;
 163
 164         return 0;
 165 }