drivers/mtd/spi/fsl_espi_spl.c

   1 /*
   2  * Copyright 2013 Freescale Semiconductor, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of
   7  * the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  *
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  18  * MA 02111-1307 USA
  19  *
  20  */
  21
  22 #include <common.h>
  23 #include <spi_flash.h>
  24 #include <malloc.h>
  25
  26 #define ESPI_BOOT_IMAGE_SIZE    0x48
  27 #define ESPI_BOOT_IMAGE_ADDR    0x50
  28 #define CONFIG_CFG_DATA_SECTOR  0
  29
  30 /*
  31  * The main entry for SPI booting. It's necessary that SDRAM is already
  32  * configured and available since this code loads the main U-Boot image
  33  * from SPI into SDRAM and starts it from there.
  34  */
  35 void spi_boot(void)
  36 {
  37         void (*uboot)(void) __noreturn;
  38         u32 offset, code_len;
  39         unsigned char *buf = NULL;
  40         struct spi_flash *flash;
  41
  42         flash = spi_flash_probe(CONFIG_ENV_SPI_BUS, CONFIG_ENV_SPI_CS,
  43                         CONFIG_ENV_SPI_MAX_HZ, CONFIG_ENV_SPI_MODE);
  44         if (flash == NULL) {
  45                 puts("\nspi_flash_probe failed");
  46                 hang();
  47         }
  48
  49         /*
  50         * Load U-Boot image from SPI flash into RAM
  51         */
  52         buf = malloc(flash->page_size);
  53         if (buf == NULL) {
  54                 puts("\nmalloc failed");
  55                 hang();
  56         }
  57         memset(buf, 0, flash->page_size);
  58
  59         spi_flash_read(flash, CONFIG_CFG_DATA_SECTOR,
  60                        flash->page_size, (void *)buf);
  61         offset = *(u32 *)(buf + ESPI_BOOT_IMAGE_ADDR);
  62         /* Skip spl code */
  63         offset += CONFIG_SYS_SPI_FLASH_U_BOOT_OFFS;
  64         /* Get the code size from offset 0x48 */
  65         code_len = *(u32 *)(buf + ESPI_BOOT_IMAGE_SIZE);
  66         /* Skip spl code */
  67         code_len = code_len - CONFIG_SPL_MAX_SIZE;
  68         /* copy code to DDR */
  69         spi_flash_read(flash, offset, code_len,
  70                        (void *)CONFIG_SYS_SPI_FLASH_U_BOOT_DST);
  71         /*
  72         * Jump to U-Boot image
  73         */
  74         flush_cache(CONFIG_SYS_SPI_FLASH_U_BOOT_DST, code_len);
  75         uboot = (void *)CONFIG_SYS_SPI_FLASH_U_BOOT_START;
  76         (*uboot)();
  77 }