linux/drivers/ssb/driver_chipcommon_sflash.c
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   1/*
   2 * Sonics Silicon Backplane
   3 * ChipCommon serial flash interface
   4 *
   5 * Licensed under the GNU/GPL. See COPYING for details.
   6 */
   7
   8#include <linux/ssb/ssb.h>
   9
  10#include "ssb_private.h"
  11
  12static struct resource ssb_sflash_resource = {
  13        .name   = "ssb_sflash",
  14        .start  = SSB_FLASH2,
  15        .end    = 0,
  16        .flags  = IORESOURCE_MEM | IORESOURCE_READONLY,
  17};
  18
  19struct platform_device ssb_sflash_dev = {
  20        .name           = "ssb_sflash",
  21        .resource       = &ssb_sflash_resource,
  22        .num_resources  = 1,
  23};
  24
  25struct ssb_sflash_tbl_e {
  26        char *name;
  27        u32 id;
  28        u32 blocksize;
  29        u16 numblocks;
  30};
  31
  32static const struct ssb_sflash_tbl_e ssb_sflash_st_tbl[] = {
  33        { "M25P20", 0x11, 0x10000, 4, },
  34        { "M25P40", 0x12, 0x10000, 8, },
  35
  36        { "M25P16", 0x14, 0x10000, 32, },
  37        { "M25P32", 0x15, 0x10000, 64, },
  38        { "M25P64", 0x16, 0x10000, 128, },
  39        { "M25FL128", 0x17, 0x10000, 256, },
  40        { 0 },
  41};
  42
  43static const struct ssb_sflash_tbl_e ssb_sflash_sst_tbl[] = {
  44        { "SST25WF512", 1, 0x1000, 16, },
  45        { "SST25VF512", 0x48, 0x1000, 16, },
  46        { "SST25WF010", 2, 0x1000, 32, },
  47        { "SST25VF010", 0x49, 0x1000, 32, },
  48        { "SST25WF020", 3, 0x1000, 64, },
  49        { "SST25VF020", 0x43, 0x1000, 64, },
  50        { "SST25WF040", 4, 0x1000, 128, },
  51        { "SST25VF040", 0x44, 0x1000, 128, },
  52        { "SST25VF040B", 0x8d, 0x1000, 128, },
  53        { "SST25WF080", 5, 0x1000, 256, },
  54        { "SST25VF080B", 0x8e, 0x1000, 256, },
  55        { "SST25VF016", 0x41, 0x1000, 512, },
  56        { "SST25VF032", 0x4a, 0x1000, 1024, },
  57        { "SST25VF064", 0x4b, 0x1000, 2048, },
  58        { 0 },
  59};
  60
  61static const struct ssb_sflash_tbl_e ssb_sflash_at_tbl[] = {
  62        { "AT45DB011", 0xc, 256, 512, },
  63        { "AT45DB021", 0x14, 256, 1024, },
  64        { "AT45DB041", 0x1c, 256, 2048, },
  65        { "AT45DB081", 0x24, 256, 4096, },
  66        { "AT45DB161", 0x2c, 512, 4096, },
  67        { "AT45DB321", 0x34, 512, 8192, },
  68        { "AT45DB642", 0x3c, 1024, 8192, },
  69        { 0 },
  70};
  71
  72static void ssb_sflash_cmd(struct ssb_chipcommon *cc, u32 opcode)
  73{
  74        int i;
  75        chipco_write32(cc, SSB_CHIPCO_FLASHCTL,
  76                       SSB_CHIPCO_FLASHCTL_START | opcode);
  77        for (i = 0; i < 1000; i++) {
  78                if (!(chipco_read32(cc, SSB_CHIPCO_FLASHCTL) &
  79                      SSB_CHIPCO_FLASHCTL_BUSY))
  80                        return;
  81                cpu_relax();
  82        }
  83        pr_err("SFLASH control command failed (timeout)!\n");
  84}
  85
  86/* Initialize serial flash access */
  87int ssb_sflash_init(struct ssb_chipcommon *cc)
  88{
  89        struct ssb_sflash *sflash = &cc->dev->bus->mipscore.sflash;
  90        const struct ssb_sflash_tbl_e *e;
  91        u32 id, id2;
  92
  93        switch (cc->capabilities & SSB_CHIPCO_CAP_FLASHT) {
  94        case SSB_CHIPCO_FLASHT_STSER:
  95                ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_DP);
  96
  97                chipco_write32(cc, SSB_CHIPCO_FLASHADDR, 0);
  98                ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_RES);
  99                id = chipco_read32(cc, SSB_CHIPCO_FLASHDATA);
 100
 101                chipco_write32(cc, SSB_CHIPCO_FLASHADDR, 1);
 102                ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_RES);
 103                id2 = chipco_read32(cc, SSB_CHIPCO_FLASHDATA);
 104
 105                switch (id) {
 106                case 0xbf:
 107                        for (e = ssb_sflash_sst_tbl; e->name; e++) {
 108                                if (e->id == id2)
 109                                        break;
 110                        }
 111                        break;
 112                case 0x13:
 113                        return -ENOTSUPP;
 114                default:
 115                        for (e = ssb_sflash_st_tbl; e->name; e++) {
 116                                if (e->id == id)
 117                                        break;
 118                        }
 119                        break;
 120                }
 121                if (!e->name) {
 122                        pr_err("Unsupported ST serial flash (id: 0x%X, id2: 0x%X)\n",
 123                               id, id2);
 124                        return -ENOTSUPP;
 125                }
 126
 127                break;
 128        case SSB_CHIPCO_FLASHT_ATSER:
 129                ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_AT_STATUS);
 130                id = chipco_read32(cc, SSB_CHIPCO_FLASHDATA) & 0x3c;
 131
 132                for (e = ssb_sflash_at_tbl; e->name; e++) {
 133                        if (e->id == id)
 134                                break;
 135                }
 136                if (!e->name) {
 137                        pr_err("Unsupported Atmel serial flash (id: 0x%X)\n",
 138                               id);
 139                        return -ENOTSUPP;
 140                }
 141
 142                break;
 143        default:
 144                pr_err("Unsupported flash type\n");
 145                return -ENOTSUPP;
 146        }
 147
 148        sflash->window = SSB_FLASH2;
 149        sflash->blocksize = e->blocksize;
 150        sflash->numblocks = e->numblocks;
 151        sflash->size = sflash->blocksize * sflash->numblocks;
 152        sflash->present = true;
 153
 154        pr_info("Found %s serial flash (blocksize: 0x%X, blocks: %d)\n",
 155                e->name, e->blocksize, e->numblocks);
 156
 157        /* Prepare platform device, but don't register it yet. It's too early,
 158         * malloc (required by device_private_init) is not available yet. */
 159        ssb_sflash_dev.resource[0].end = ssb_sflash_dev.resource[0].start +
 160                                         sflash->size;
 161        ssb_sflash_dev.dev.platform_data = sflash;
 162
 163        pr_err("Serial flash support is not implemented yet!\n");
 164
 165        return -ENOTSUPP;
 166}
 167
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