git.sur5r.net Git - u-boot/blob - 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_WREN       0x06    /* Write Enable */
  15 #define CMD_EN25Q128_WRDI       0x04    /* Write Disable */
  16 #define CMD_EN25Q128_RDSR       0x05    /* Read Status Register */
  17 #define CMD_EN25Q128_WRSR       0x01    /* Write Status Register */
  18 #define CMD_EN25Q128_READ       0x03    /* Read Data Bytes */
  19 #define CMD_EN25Q128_FAST_READ  0x0b    /* Read Data Bytes at Higher Speed */
  20 #define CMD_EN25Q128_PP         0x02    /* Page Program */
  21 #define CMD_EN25Q128_SE         0x20    /* Sector Erase */
  22 #define CMD_EN25Q128_BE         0xd8    /* Block Erase */
  23 #define CMD_EN25Q128_DP         0xb9    /* Deep Power-down */
  24 #define CMD_EN25Q128_RES        0xab    /* Release from DP, and Read Signature */
  25
  26 #define EON_ID_EN25Q128         0x18
  27
  28 struct eon_spi_flash_params {
  29         u8 idcode1;
  30         u16 page_size;
  31         u16 pages_per_sector;
  32         u16 sectors_per_block;
  33         u16 nr_sectors;
  34         const char *name;
  35 };
  36
  37 static const struct eon_spi_flash_params eon_spi_flash_table[] = {
  38         {
  39                 .idcode1 = EON_ID_EN25Q128,
  40                 .page_size = 256,
  41                 .pages_per_sector = 16,
  42                 .sectors_per_block = 16,
  43                 .nr_sectors = 4096,
  44                 .name = "EN25Q128",
  45         },
  46 };
  47
  48 static int eon_erase(struct spi_flash *flash, u32 offset, size_t len)
  49 {
  50         return spi_flash_cmd_erase(flash, CMD_EN25Q128_BE, offset, len);
  51 }
  52
  53 struct spi_flash *spi_flash_probe_eon(struct spi_slave *spi, u8 *idcode)
  54 {
  55         const struct eon_spi_flash_params *params;
  56         struct spi_flash *flash;
  57         unsigned int i;
  58
  59         for (i = 0; i < ARRAY_SIZE(eon_spi_flash_table); ++i) {
  60                 params = &eon_spi_flash_table[i];
  61                 if (params->idcode1 == idcode[2])
  62                         break;
  63         }
  64
  65         if (i == ARRAY_SIZE(eon_spi_flash_table)) {
  66                 debug("SF: Unsupported EON ID %02x\n", idcode[1]);
  67                 return NULL;
  68         }
  69
  70         flash = malloc(sizeof(*flash));
  71         if (!flash) {
  72                 debug("SF: Failed to allocate memory\n");
  73                 return NULL;
  74         }
  75
  76         flash->spi = spi;
  77         flash->name = params->name;
  78
  79         flash->write = spi_flash_cmd_write_multi;
  80         flash->erase = eon_erase;
  81         flash->read = spi_flash_cmd_read_fast;
  82         flash->page_size = params->page_size;
  83         flash->sector_size = params->page_size * params->pages_per_sector
  84             * params->sectors_per_block;
  85         flash->size = params->page_size * params->pages_per_sector
  86             * params->nr_sectors;
  87
  88         return flash;
  89 }