drivers/mtd/spi/sst.c

   1 /*
   2  * Driver for SST serial flashes
   3  *
   4  * (C) Copyright 2000-2002
   5  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   6  * Copyright 2008, Network Appliance Inc.
   7  * Jason McMullan <mcmullan@netapp.com>
   8  * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
   9  * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
  10  * Copyright (c) 2008-2009 Analog Devices Inc.
  11  *
  12  * Licensed under the GPL-2 or later.
  13  */
  14
  15 #include <common.h>
  16 #include <malloc.h>
  17 #include <spi_flash.h>
  18
  19 #include "spi_flash_internal.h"
  20
  21 #define CMD_SST_WREN            0x06    /* Write Enable */
  22 #define CMD_SST_WRDI            0x04    /* Write Disable */
  23 #define CMD_SST_RDSR            0x05    /* Read Status Register */
  24 #define CMD_SST_WRSR            0x01    /* Write Status Register */
  25 #define CMD_SST_READ            0x03    /* Read Data Bytes */
  26 #define CMD_SST_FAST_READ       0x0b    /* Read Data Bytes at Higher Speed */
  27 #define CMD_SST_BP              0x02    /* Byte Program */
  28 #define CMD_SST_AAI_WP          0xAD    /* Auto Address Increment Word Program */
  29 #define CMD_SST_SE              0x20    /* Sector Erase */
  30
  31 #define SST_SR_WIP              (1 << 0)        /* Write-in-Progress */
  32 #define SST_SR_WEL              (1 << 1)        /* Write enable */
  33 #define SST_SR_BP0              (1 << 2)        /* Block Protection 0 */
  34 #define SST_SR_BP1              (1 << 3)        /* Block Protection 1 */
  35 #define SST_SR_BP2              (1 << 4)        /* Block Protection 2 */
  36 #define SST_SR_AAI              (1 << 6)        /* Addressing mode */
  37 #define SST_SR_BPL              (1 << 7)        /* BP bits lock */
  38
  39 struct sst_spi_flash_params {
  40         u8 idcode1;
  41         u16 nr_sectors;
  42         const char *name;
  43 };
  44
  45 struct sst_spi_flash {
  46         struct spi_flash flash;
  47         const struct sst_spi_flash_params *params;
  48 };
  49
  50 static inline struct sst_spi_flash *to_sst_spi_flash(struct spi_flash *flash)
  51 {
  52         return container_of(flash, struct sst_spi_flash, flash);
  53 }
  54
  55 #define SST_SECTOR_SIZE (4 * 1024)
  56 static const struct sst_spi_flash_params sst_spi_flash_table[] = {
  57         {
  58                 .idcode1 = 0x8d,
  59                 .nr_sectors = 128,
  60                 .name = "SST25VF040B",
  61         },{
  62                 .idcode1 = 0x8e,
  63                 .nr_sectors = 256,
  64                 .name = "SST25VF080B",
  65         },{
  66                 .idcode1 = 0x41,
  67                 .nr_sectors = 512,
  68                 .name = "SST25VF016B",
  69         },{
  70                 .idcode1 = 0x4a,
  71                 .nr_sectors = 1024,
  72                 .name = "SST25VF032B",
  73         },{
  74                 .idcode1 = 0x4b,
  75                 .nr_sectors = 2048,
  76                 .name = "SST25VF064C",
  77         },{
  78                 .idcode1 = 0x01,
  79                 .nr_sectors = 16,
  80                 .name = "SST25WF512",
  81         },{
  82                 .idcode1 = 0x02,
  83                 .nr_sectors = 32,
  84                 .name = "SST25WF010",
  85         },{
  86                 .idcode1 = 0x03,
  87                 .nr_sectors = 64,
  88                 .name = "SST25WF020",
  89         },{
  90                 .idcode1 = 0x04,
  91                 .nr_sectors = 128,
  92                 .name = "SST25WF040",
  93         },
  94 };
  95
  96 static int
  97 sst_enable_writing(struct spi_flash *flash)
  98 {
  99         int ret = spi_flash_cmd_write_enable(flash);
 100         if (ret)
 101                 debug("SF: Enabling Write failed\n");
 102         return ret;
 103 }
 104
 105 static int
 106 sst_disable_writing(struct spi_flash *flash)
 107 {
 108         int ret = spi_flash_cmd(flash->spi, CMD_SST_WRDI, NULL, 0);
 109         if (ret)
 110                 debug("SF: Disabling Write failed\n");
 111         return ret;
 112 }
 113
 114 static int
 115 sst_byte_write(struct spi_flash *flash, u32 offset, const void *buf)
 116 {
 117         int ret;
 118         u8 cmd[4] = {
 119                 CMD_SST_BP,
 120                 offset >> 16,
 121                 offset >> 8,
 122                 offset,
 123         };
 124
 125         debug("BP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
 126                 spi_w8r8(flash->spi, CMD_SST_RDSR), buf, cmd[0], offset);
 127
 128         ret = sst_enable_writing(flash);
 129         if (ret)
 130                 return ret;
 131
 132         ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), buf, 1);
 133         if (ret)
 134                 return ret;
 135
 136         return spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
 137 }
 138
 139 static int
 140 sst_write(struct spi_flash *flash, u32 offset, size_t len, const void *buf)
 141 {
 142         size_t actual, cmd_len;
 143         int ret;
 144         u8 cmd[4];
 145
 146         ret = spi_claim_bus(flash->spi);
 147         if (ret) {
 148                 debug("SF: Unable to claim SPI bus\n");
 149                 return ret;
 150         }
 151
 152         /* If the data is not word aligned, write out leading single byte */
 153         actual = offset % 2;
 154         if (actual) {
 155                 ret = sst_byte_write(flash, offset, buf);
 156                 if (ret)
 157                         goto done;
 158         }
 159         offset += actual;
 160
 161         ret = sst_enable_writing(flash);
 162         if (ret)
 163                 goto done;
 164
 165         cmd_len = 4;
 166         cmd[0] = CMD_SST_AAI_WP;
 167         cmd[1] = offset >> 16;
 168         cmd[2] = offset >> 8;
 169         cmd[3] = offset;
 170
 171         for (; actual < len - 1; actual += 2) {
 172                 debug("WP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
 173                      spi_w8r8(flash->spi, CMD_SST_RDSR), buf + actual, cmd[0],
 174                      offset);
 175
 176                 ret = spi_flash_cmd_write(flash->spi, cmd, cmd_len,
 177                                           buf + actual, 2);
 178                 if (ret) {
 179                         debug("SF: sst word program failed\n");
 180                         break;
 181                 }
 182
 183                 ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
 184                 if (ret)
 185                         break;
 186
 187                 cmd_len = 1;
 188                 offset += 2;
 189         }
 190
 191         if (!ret)
 192                 ret = sst_disable_writing(flash);
 193
 194         /* If there is a single trailing byte, write it out */
 195         if (!ret && actual != len)
 196                 ret = sst_byte_write(flash, offset, buf + actual);
 197
 198  done:
 199         debug("SF: sst: program %s %zu bytes @ 0x%zx\n",
 200               ret ? "failure" : "success", len, offset - actual);
 201
 202         spi_release_bus(flash->spi);
 203         return ret;
 204 }
 205
 206 static int sst_erase(struct spi_flash *flash, u32 offset, size_t len)
 207 {
 208         return spi_flash_cmd_erase(flash, CMD_SST_SE, offset, len);
 209 }
 210
 211 static int
 212 sst_unlock(struct spi_flash *flash)
 213 {
 214         int ret;
 215         u8 cmd, status;
 216
 217         ret = sst_enable_writing(flash);
 218         if (ret)
 219                 return ret;
 220
 221         cmd = CMD_SST_WRSR;
 222         status = 0;
 223         ret = spi_flash_cmd_write(flash->spi, &cmd, 1, &status, 1);
 224         if (ret)
 225                 debug("SF: Unable to set status byte\n");
 226
 227         debug("SF: sst: status = %x\n", spi_w8r8(flash->spi, CMD_SST_RDSR));
 228
 229         return ret;
 230 }
 231
 232 struct spi_flash *
 233 spi_flash_probe_sst(struct spi_slave *spi, u8 *idcode)
 234 {
 235         const struct sst_spi_flash_params *params;
 236         struct sst_spi_flash *stm;
 237         size_t i;
 238
 239         for (i = 0; i < ARRAY_SIZE(sst_spi_flash_table); ++i) {
 240                 params = &sst_spi_flash_table[i];
 241                 if (params->idcode1 == idcode[2])
 242                         break;
 243         }
 244
 245         if (i == ARRAY_SIZE(sst_spi_flash_table)) {
 246                 debug("SF: Unsupported SST ID %02x\n", idcode[1]);
 247                 return NULL;
 248         }
 249
 250         stm = malloc(sizeof(*stm));
 251         if (!stm) {
 252                 debug("SF: Failed to allocate memory\n");
 253                 return NULL;
 254         }
 255
 256         stm->params = params;
 257         stm->flash.spi = spi;
 258         stm->flash.name = params->name;
 259
 260         stm->flash.write = sst_write;
 261         stm->flash.erase = sst_erase;
 262         stm->flash.read = spi_flash_cmd_read_fast;
 263         stm->flash.sector_size = SST_SECTOR_SIZE;
 264         stm->flash.size = stm->flash.sector_size * params->nr_sectors;
 265
 266         /* Flash powers up read-only, so clear BP# bits */
 267         sst_unlock(&stm->flash);
 268
 269         return &stm->flash;
 270 }