drivers/mtd/spi/spi_flash.c

   1 /*
   2  * SPI flash interface
   3  *
   4  * Copyright (C) 2008 Atmel Corporation
   5  * Copyright (C) 2010 Reinhard Meyer, EMK Elektronik
   6  *
   7  * Licensed under the GPL-2 or later.
   8  */
   9
  10 #include <common.h>
  11 #include <malloc.h>
  12 #include <spi.h>
  13 #include <spi_flash.h>
  14 #include <watchdog.h>
  15
  16 #include "spi_flash_internal.h"
  17
  18 static void spi_flash_addr(u32 addr, u8 *cmd)
  19 {
  20         /* cmd[0] is actual command */
  21         cmd[1] = addr >> 16;
  22         cmd[2] = addr >> 8;
  23         cmd[3] = addr >> 0;
  24 }
  25
  26 static int spi_flash_read_write(struct spi_slave *spi,
  27                                 const u8 *cmd, size_t cmd_len,
  28                                 const u8 *data_out, u8 *data_in,
  29                                 size_t data_len)
  30 {
  31         unsigned long flags = SPI_XFER_BEGIN;
  32         int ret;
  33
  34         if (data_len == 0)
  35                 flags |= SPI_XFER_END;
  36
  37         ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags);
  38         if (ret) {
  39                 debug("SF: Failed to send command (%zu bytes): %d\n",
  40                                 cmd_len, ret);
  41         } else if (data_len != 0) {
  42                 ret = spi_xfer(spi, data_len * 8, data_out, data_in, SPI_XFER_END);
  43                 if (ret)
  44                         debug("SF: Failed to transfer %zu bytes of data: %d\n",
  45                                         data_len, ret);
  46         }
  47
  48         return ret;
  49 }
  50
  51 int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len)
  52 {
  53         return spi_flash_cmd_read(spi, &cmd, 1, response, len);
  54 }
  55
  56 int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
  57                 size_t cmd_len, void *data, size_t data_len)
  58 {
  59         return spi_flash_read_write(spi, cmd, cmd_len, NULL, data, data_len);
  60 }
  61
  62 int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
  63                 const void *data, size_t data_len)
  64 {
  65         return spi_flash_read_write(spi, cmd, cmd_len, data, NULL, data_len);
  66 }
  67
  68 int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
  69                 size_t cmd_len, void *data, size_t data_len)
  70 {
  71         struct spi_slave *spi = flash->spi;
  72         int ret;
  73
  74         spi_claim_bus(spi);
  75         ret = spi_flash_cmd_read(spi, cmd, cmd_len, data, data_len);
  76         spi_release_bus(spi);
  77
  78         return ret;
  79 }
  80
  81 int spi_flash_cmd_read_fast(struct spi_flash *flash, u32 offset,
  82                 size_t len, void *data)
  83 {
  84         u8 cmd[5];
  85
  86         cmd[0] = CMD_READ_ARRAY_FAST;
  87         spi_flash_addr(offset, cmd);
  88         cmd[4] = 0x00;
  89
  90         return spi_flash_read_common(flash, cmd, sizeof(cmd), data, len);
  91 }
  92
  93 int spi_flash_cmd_poll_bit(struct spi_flash *flash, unsigned long timeout,
  94                            u8 cmd, u8 poll_bit)
  95 {
  96         struct spi_slave *spi = flash->spi;
  97         unsigned long timebase;
  98         int ret;
  99         u8 status;
 100
 101         ret = spi_xfer(spi, 8, &cmd, NULL, SPI_XFER_BEGIN);
 102         if (ret) {
 103                 debug("SF: Failed to send command %02x: %d\n", cmd, ret);
 104                 return ret;
 105         }
 106
 107         timebase = get_timer(0);
 108         do {
 109                 WATCHDOG_RESET();
 110
 111                 ret = spi_xfer(spi, 8, NULL, &status, 0);
 112                 if (ret)
 113                         return -1;
 114
 115                 if ((status & poll_bit) == 0)
 116                         break;
 117
 118         } while (get_timer(timebase) < timeout);
 119
 120         spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END);
 121
 122         if ((status & poll_bit) == 0)
 123                 return 0;
 124
 125         /* Timed out */
 126         debug("SF: time out!\n");
 127         return -1;
 128 }
 129
 130 int spi_flash_cmd_wait_ready(struct spi_flash *flash, unsigned long timeout)
 131 {
 132         return spi_flash_cmd_poll_bit(flash, timeout,
 133                 CMD_READ_STATUS, STATUS_WIP);
 134 }
 135
 136 int spi_flash_cmd_erase(struct spi_flash *flash, u8 erase_cmd,
 137                         u32 offset, size_t len)
 138 {
 139         u32 start, end, erase_size;
 140         int ret;
 141         u8 cmd[4];
 142
 143         erase_size = flash->sector_size;
 144         if (offset % erase_size || len % erase_size) {
 145                 debug("SF: Erase offset/length not multiple of erase size\n");
 146                 return -1;
 147         }
 148
 149         ret = spi_claim_bus(flash->spi);
 150         if (ret) {
 151                 debug("SF: Unable to claim SPI bus\n");
 152                 return ret;
 153         }
 154
 155         cmd[0] = erase_cmd;
 156         start = offset;
 157         end = start + len;
 158
 159         while (offset < end) {
 160                 spi_flash_addr(offset, cmd);
 161                 offset += erase_size;
 162
 163                 debug("SF: erase %2x %2x %2x %2x (%x)\n", cmd[0], cmd[1],
 164                       cmd[2], cmd[3], offset);
 165
 166                 ret = spi_flash_cmd(flash->spi, CMD_WRITE_ENABLE, NULL, 0);
 167                 if (ret)
 168                         goto out;
 169
 170                 ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), NULL, 0);
 171                 if (ret)
 172                         goto out;
 173
 174                 ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
 175                 if (ret)
 176                         goto out;
 177         }
 178
 179         debug("SF: Successfully erased %lu bytes @ %#x\n",
 180               len * erase_size, start);
 181
 182  out:
 183         spi_release_bus(flash->spi);
 184         return ret;
 185 }
 186
 187 /*
 188  * The following table holds all device probe functions
 189  *
 190  * shift:  number of continuation bytes before the ID
 191  * idcode: the expected IDCODE or 0xff for non JEDEC devices
 192  * probe:  the function to call
 193  *
 194  * Non JEDEC devices should be ordered in the table such that
 195  * the probe functions with best detection algorithms come first.
 196  *
 197  * Several matching entries are permitted, they will be tried
 198  * in sequence until a probe function returns non NULL.
 199  *
 200  * IDCODE_CONT_LEN may be redefined if a device needs to declare a
 201  * larger "shift" value.  IDCODE_PART_LEN generally shouldn't be
 202  * changed.  This is the max number of bytes probe functions may
 203  * examine when looking up part-specific identification info.
 204  *
 205  * Probe functions will be given the idcode buffer starting at their
 206  * manu id byte (the "idcode" in the table below).  In other words,
 207  * all of the continuation bytes will be skipped (the "shift" below).
 208  */
 209 #define IDCODE_CONT_LEN 0
 210 #define IDCODE_PART_LEN 5
 211 static const struct {
 212         const u8 shift;
 213         const u8 idcode;
 214         struct spi_flash *(*probe) (struct spi_slave *spi, u8 *idcode);
 215 } flashes[] = {
 216         /* Keep it sorted by define name */
 217 #ifdef CONFIG_SPI_FLASH_ATMEL
 218         { 0, 0x1f, spi_flash_probe_atmel, },
 219 #endif
 220 #ifdef CONFIG_SPI_FLASH_EON
 221         { 0, 0x1c, spi_flash_probe_eon, },
 222 #endif
 223 #ifdef CONFIG_SPI_FLASH_MACRONIX
 224         { 0, 0xc2, spi_flash_probe_macronix, },
 225 #endif
 226 #ifdef CONFIG_SPI_FLASH_SPANSION
 227         { 0, 0x01, spi_flash_probe_spansion, },
 228 #endif
 229 #ifdef CONFIG_SPI_FLASH_SST
 230         { 0, 0xbf, spi_flash_probe_sst, },
 231 #endif
 232 #ifdef CONFIG_SPI_FLASH_STMICRO
 233         { 0, 0x20, spi_flash_probe_stmicro, },
 234 #endif
 235 #ifdef CONFIG_SPI_FLASH_WINBOND
 236         { 0, 0xef, spi_flash_probe_winbond, },
 237 #endif
 238 #ifdef CONFIG_SPI_FRAM_RAMTRON
 239         { 6, 0xc2, spi_fram_probe_ramtron, },
 240 # undef IDCODE_CONT_LEN
 241 # define IDCODE_CONT_LEN 6
 242 #endif
 243         /* Keep it sorted by best detection */
 244 #ifdef CONFIG_SPI_FLASH_STMICRO
 245         { 0, 0xff, spi_flash_probe_stmicro, },
 246 #endif
 247 #ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC
 248         { 0, 0xff, spi_fram_probe_ramtron, },
 249 #endif
 250 };
 251 #define IDCODE_LEN (IDCODE_CONT_LEN + IDCODE_PART_LEN)
 252
 253 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 254                 unsigned int max_hz, unsigned int spi_mode)
 255 {
 256         struct spi_slave *spi;
 257         struct spi_flash *flash = NULL;
 258         int ret, i, shift;
 259         u8 idcode[IDCODE_LEN], *idp;
 260
 261         spi = spi_setup_slave(bus, cs, max_hz, spi_mode);
 262         if (!spi) {
 263                 printf("SF: Failed to set up slave\n");
 264                 return NULL;
 265         }
 266
 267         ret = spi_claim_bus(spi);
 268         if (ret) {
 269                 debug("SF: Failed to claim SPI bus: %d\n", ret);
 270                 goto err_claim_bus;
 271         }
 272
 273         /* Read the ID codes */
 274         ret = spi_flash_cmd(spi, CMD_READ_ID, idcode, sizeof(idcode));
 275         if (ret)
 276                 goto err_read_id;
 277
 278 #ifdef DEBUG
 279         printf("SF: Got idcodes\n");
 280         print_buffer(0, idcode, 1, sizeof(idcode), 0);
 281 #endif
 282
 283         /* count the number of continuation bytes */
 284         for (shift = 0, idp = idcode;
 285              shift < IDCODE_CONT_LEN && *idp == 0x7f;
 286              ++shift, ++idp)
 287                 continue;
 288
 289         /* search the table for matches in shift and id */
 290         for (i = 0; i < ARRAY_SIZE(flashes); ++i)
 291                 if (flashes[i].shift == shift && flashes[i].idcode == *idp) {
 292                         /* we have a match, call probe */
 293                         flash = flashes[i].probe(spi, idp);
 294                         if (flash)
 295                                 break;
 296                 }
 297
 298         if (!flash) {
 299                 printf("SF: Unsupported manufacturer %02x\n", *idp);
 300                 goto err_manufacturer_probe;
 301         }
 302
 303         printf("SF: Detected %s with page size ", flash->name);
 304         print_size(flash->sector_size, ", total ");
 305         print_size(flash->size, "\n");
 306
 307         spi_release_bus(spi);
 308
 309         return flash;
 310
 311 err_manufacturer_probe:
 312 err_read_id:
 313         spi_release_bus(spi);
 314 err_claim_bus:
 315         spi_free_slave(spi);
 316         return NULL;
 317 }
 318
 319 void spi_flash_free(struct spi_flash *flash)
 320 {
 321         spi_free_slave(flash->spi);
 322         free(flash);
 323 }