drivers/ssb/driver_chipcommon_sflash.c

   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
  12 struct ssb_sflash_tbl_e {
  13         char *name;
  14         u32 id;
  15         u32 blocksize;
  16         u16 numblocks;
  17 };
  18
  19 static struct ssb_sflash_tbl_e ssb_sflash_st_tbl[] = {
  20         { "M25P20", 0x11, 0x10000, 4, },
  21         { "M25P40", 0x12, 0x10000, 8, },
  22
  23         { "M25P16", 0x14, 0x10000, 32, },
  24         { "M25P32", 0x15, 0x10000, 64, },
  25         { "M25P64", 0x16, 0x10000, 128, },
  26         { "M25FL128", 0x17, 0x10000, 256, },
  27         { 0 },
  28 };
  29
  30 static struct ssb_sflash_tbl_e ssb_sflash_sst_tbl[] = {
  31         { "SST25WF512", 1, 0x1000, 16, },
  32         { "SST25VF512", 0x48, 0x1000, 16, },
  33         { "SST25WF010", 2, 0x1000, 32, },
  34         { "SST25VF010", 0x49, 0x1000, 32, },
  35         { "SST25WF020", 3, 0x1000, 64, },
  36         { "SST25VF020", 0x43, 0x1000, 64, },
  37         { "SST25WF040", 4, 0x1000, 128, },
  38         { "SST25VF040", 0x44, 0x1000, 128, },
  39         { "SST25VF040B", 0x8d, 0x1000, 128, },
  40         { "SST25WF080", 5, 0x1000, 256, },
  41         { "SST25VF080B", 0x8e, 0x1000, 256, },
  42         { "SST25VF016", 0x41, 0x1000, 512, },
  43         { "SST25VF032", 0x4a, 0x1000, 1024, },
  44         { "SST25VF064", 0x4b, 0x1000, 2048, },
  45         { 0 },
  46 };
  47
  48 static struct ssb_sflash_tbl_e ssb_sflash_at_tbl[] = {
  49         { "AT45DB011", 0xc, 256, 512, },
  50         { "AT45DB021", 0x14, 256, 1024, },
  51         { "AT45DB041", 0x1c, 256, 2048, },
  52         { "AT45DB081", 0x24, 256, 4096, },
  53         { "AT45DB161", 0x2c, 512, 4096, },
  54         { "AT45DB321", 0x34, 512, 8192, },
  55         { "AT45DB642", 0x3c, 1024, 8192, },
  56         { 0 },
  57 };
  58
  59 static void ssb_sflash_cmd(struct ssb_chipcommon *cc, u32 opcode)
  60 {
  61         int i;
  62         chipco_write32(cc, SSB_CHIPCO_FLASHCTL,
  63                        SSB_CHIPCO_FLASHCTL_START | opcode);
  64         for (i = 0; i < 1000; i++) {
  65                 if (!(chipco_read32(cc, SSB_CHIPCO_FLASHCTL) &
  66                       SSB_CHIPCO_FLASHCTL_BUSY))
  67                         return;
  68                 cpu_relax();
  69         }
  70         pr_err("SFLASH control command failed (timeout)!\n");
  71 }
  72
  73 /* Initialize serial flash access */
  74 int ssb_sflash_init(struct ssb_chipcommon *cc)
  75 {
  76         struct ssb_sflash_tbl_e *e;
  77         u32 id, id2;
  78
  79         switch (cc->capabilities & SSB_CHIPCO_CAP_FLASHT) {
  80         case SSB_CHIPCO_FLASHT_STSER:
  81                 ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_DP);
  82
  83                 chipco_write32(cc, SSB_CHIPCO_FLASHADDR, 0);
  84                 ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_RES);
  85                 id = chipco_read32(cc, SSB_CHIPCO_FLASHDATA);
  86
  87                 chipco_write32(cc, SSB_CHIPCO_FLASHADDR, 1);
  88                 ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_ST_RES);
  89                 id2 = chipco_read32(cc, SSB_CHIPCO_FLASHDATA);
  90
  91                 switch (id) {
  92                 case 0xbf:
  93                         for (e = ssb_sflash_sst_tbl; e->name; e++) {
  94                                 if (e->id == id2)
  95                                         break;
  96                         }
  97                         break;
  98                 case 0x13:
  99                         return -ENOTSUPP;
 100                 default:
 101                         for (e = ssb_sflash_st_tbl; e->name; e++) {
 102                                 if (e->id == id)
 103                                         break;
 104                         }
 105                         break;
 106                 }
 107                 if (!e->name) {
 108                         pr_err("Unsupported ST serial flash (id: 0x%X, id2: 0x%X)\n",
 109                                id, id2);
 110                         return -ENOTSUPP;
 111                 }
 112
 113                 break;
 114         case SSB_CHIPCO_FLASHT_ATSER:
 115                 ssb_sflash_cmd(cc, SSB_CHIPCO_FLASHCTL_AT_STATUS);
 116                 id = chipco_read32(cc, SSB_CHIPCO_FLASHDATA) & 0x3c;
 117
 118                 for (e = ssb_sflash_at_tbl; e->name; e++) {
 119                         if (e->id == id)
 120                                 break;
 121                 }
 122                 if (!e->name) {
 123                         pr_err("Unsupported Atmel serial flash (id: 0x%X)\n",
 124                                id);
 125                         return -ENOTSUPP;
 126                 }
 127
 128                 break;
 129         default:
 130                 pr_err("Unsupported flash type\n");
 131                 return -ENOTSUPP;
 132         }
 133
 134         pr_info("Found %s serial flash (blocksize: 0x%X, blocks: %d)\n",
 135                 e->name, e->blocksize, e->numblocks);
 136
 137         pr_err("Serial flash support is not implemented yet!\n");
 138
 139         return -ENOTSUPP;
 140 }