drivers/mtd/spi/eon.c

   1 /*
   2  * (C) Copyright 2010, ucRobotics Inc.
   3  * Author: Chong Huang <chuang@ucrobotics.com>
   4  * Licensed under the GPL-2 or later.
   5  */
   6
   7 #include <common.h>
   8 #include <malloc.h>
   9 #include <spi_flash.h>
  10
  11 #include "spi_flash_internal.h"
  12
  13 /* EN25Q128-specific commands */
  14 #define CMD_EN25Q128_SE         0x20    /* Sector Erase */
  15 #define CMD_EN25Q128_BE         0xd8    /* Block Erase */
  16
  17 struct eon_spi_flash_params {
  18         u8 idcode1;
  19         u16 nr_sectors;
  20         const char *name;
  21 };
  22
  23 static const struct eon_spi_flash_params eon_spi_flash_table[] = {
  24         {
  25                 .idcode1 = 0x16,
  26                 .nr_sectors = 1024,
  27                 .name = "EN25Q32B",
  28         },
  29         {
  30                 .idcode1 = 0x18,
  31                 .nr_sectors = 4096,
  32                 .name = "EN25Q128",
  33         },
  34         {
  35                 .idcode1 = 0x16,
  36                 .nr_sectors = 1024,
  37                 .name = "EN25Q32B",
  38         },
  39 };
  40
  41 static int eon_erase(struct spi_flash *flash, u32 offset, size_t len)
  42 {
  43         return spi_flash_cmd_erase(flash, CMD_EN25Q128_BE, offset, len);
  44 }
  45
  46 struct spi_flash *spi_flash_probe_eon(struct spi_slave *spi, u8 *idcode)
  47 {
  48         const struct eon_spi_flash_params *params;
  49         struct spi_flash *flash;
  50         unsigned int i;
  51
  52         for (i = 0; i < ARRAY_SIZE(eon_spi_flash_table); ++i) {
  53                 params = &eon_spi_flash_table[i];
  54                 if (params->idcode1 == idcode[2])
  55                         break;
  56         }
  57
  58         if (i == ARRAY_SIZE(eon_spi_flash_table)) {
  59                 debug("SF: Unsupported EON ID %02x\n", idcode[1]);
  60                 return NULL;
  61         }
  62
  63         flash = malloc(sizeof(*flash));
  64         if (!flash) {
  65                 debug("SF: Failed to allocate memory\n");
  66                 return NULL;
  67         }
  68
  69         flash->spi = spi;
  70         flash->name = params->name;
  71
  72         flash->write = spi_flash_cmd_write_multi;
  73         flash->erase = eon_erase;
  74         flash->read = spi_flash_cmd_read_fast;
  75         flash->page_size = 256;
  76         flash->sector_size = 256 * 16 * 16;
  77         flash->size = 256 * 16
  78             * params->nr_sectors;
  79
  80         return flash;
  81 }