linux/drivers/bcma/driver_chipcommon_sflash.c
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   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 <linux/platform_device.h>
   9#include <linux/bcma/bcma.h>
  10
  11#include "bcma_private.h"
  12
  13static 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
  20struct platform_device bcma_sflash_dev = {
  21        .name           = "bcma_sflash",
  22        .resource       = &bcma_sflash_resource,
  23        .num_resources  = 1,
  24};
  25
  26struct bcma_sflash_tbl_e {
  27        char *name;
  28        u32 id;
  29        u32 blocksize;
  30        u16 numblocks;
  31};
  32
  33static 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        { 0 },
  42};
  43
  44static 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        { 0 },
  60};
  61
  62static 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        { 0 },
  71};
  72
  73static 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 */
  88int 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        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}
 166
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