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 /* spi_flash needs to be first so upper layers can free() it */
  38 struct eon_spi_flash {
  39         struct spi_flash flash;
  40         const struct eon_spi_flash_params *params;
  41 };
  42
  43 static inline struct eon_spi_flash *to_eon_spi_flash(struct spi_flash *flash)
  44 {
  45         return container_of(flash, struct eon_spi_flash, flash);
  46 }
  47
  48 static const struct eon_spi_flash_params eon_spi_flash_table[] = {
  49         {
  50                 .idcode1 = EON_ID_EN25Q128,
  51                 .page_size = 256,
  52                 .pages_per_sector = 16,
  53                 .sectors_per_block = 16,
  54                 .nr_sectors = 4096,
  55                 .name = "EN25Q128",
  56         },
  57 };
  58
  59 static int eon_erase(struct spi_flash *flash, u32 offset, size_t len)
  60 {
  61         return spi_flash_cmd_erase(flash, CMD_EN25Q128_BE, offset, len);
  62 }
  63
  64 struct spi_flash *spi_flash_probe_eon(struct spi_slave *spi, u8 *idcode)
  65 {
  66         const struct eon_spi_flash_params *params;
  67         struct eon_spi_flash *eon;
  68         unsigned int i;
  69
  70         for (i = 0; i < ARRAY_SIZE(eon_spi_flash_table); ++i) {
  71                 params = &eon_spi_flash_table[i];
  72                 if (params->idcode1 == idcode[2])
  73                         break;
  74         }
  75
  76         if (i == ARRAY_SIZE(eon_spi_flash_table)) {
  77                 debug("SF: Unsupported EON ID %02x\n", idcode[1]);
  78                 return NULL;
  79         }
  80
  81         eon = malloc(sizeof(*eon));
  82         if (!eon) {
  83                 debug("SF: Failed to allocate memory\n");
  84                 return NULL;
  85         }
  86
  87         eon->params = params;
  88         eon->flash.spi = spi;
  89         eon->flash.name = params->name;
  90
  91         eon->flash.write = spi_flash_cmd_write_multi;
  92         eon->flash.erase = eon_erase;
  93         eon->flash.read = spi_flash_cmd_read_fast;
  94         eon->flash.page_size = params->page_size;
  95         eon->flash.sector_size = params->page_size * params->pages_per_sector
  96             * params->sectors_per_block;
  97         eon->flash.size = params->page_size * params->pages_per_sector
  98             * params->nr_sectors;
  99
 100         return &eon->flash;
 101 }