git.sur5r.net Git - u-boot/blob - drivers/mtd/spi/spi_spl_load.c

   1 /*
   2  * Copyright (C) 2011 OMICRON electronics GmbH
   3  *
   4  * based on drivers/mtd/nand/nand_spl_load.c
   5  *
   6  * Copyright (C) 2011
   7  * Heiko Schocher, DENX Software Engineering, hs@denx.de.
   8  *
   9  * SPDX-License-Identifier:     GPL-2.0+
  10  */
  11
  12 #include <common.h>
  13 #include <spi.h>
  14 #include <spi_flash.h>
  15 #include <errno.h>
  16 #include <spl.h>
  17
  18 #ifdef CONFIG_SPL_OS_BOOT
  19 /*
  20  * Load the kernel, check for a valid header we can parse, and if found load
  21  * the kernel and then device tree.
  22  */
  23 static int spi_load_image_os(struct spi_flash *flash,
  24                              struct image_header *header)
  25 {
  26         int err;
  27
  28         /* Read for a header, parse or error out. */
  29         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS, 0x40,
  30                        (void *)header);
  31
  32         if (image_get_magic(header) != IH_MAGIC)
  33                 return -1;
  34
  35         err = spl_parse_image_header(header);
  36         if (err)
  37                 return err;
  38
  39         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS,
  40                        spl_image.size, (void *)spl_image.load_addr);
  41
  42         /* Read device tree. */
  43         spi_flash_read(flash, CONFIG_SYS_SPI_ARGS_OFFS,
  44                        CONFIG_SYS_SPI_ARGS_SIZE,
  45                        (void *)CONFIG_SYS_SPL_ARGS_ADDR);
  46
  47         return 0;
  48 }
  49 #endif
  50
  51 /*
  52  * The main entry for SPI booting. It's necessary that SDRAM is already
  53  * configured and available since this code loads the main U-Boot image
  54  * from SPI into SDRAM and starts it from there.
  55  */
  56 int spl_spi_load_image(void)
  57 {
  58         int err = 0;
  59         struct spi_flash *flash;
  60         struct image_header *header;
  61
  62         /*
  63          * Load U-Boot image from SPI flash into RAM
  64          */
  65
  66         flash = spi_flash_probe(CONFIG_SF_DEFAULT_BUS,
  67                                 CONFIG_SF_DEFAULT_CS,
  68                                 CONFIG_SF_DEFAULT_SPEED,
  69                                 CONFIG_SF_DEFAULT_MODE);
  70         if (!flash) {
  71                 puts("SPI probe failed.\n");
  72                 return -ENODEV;
  73         }
  74
  75         /* use CONFIG_SYS_TEXT_BASE as temporary storage area */
  76         header = (struct image_header *)(CONFIG_SYS_TEXT_BASE);
  77
  78 #ifdef CONFIG_SPL_OS_BOOT
  79         if (spl_start_uboot() || spi_load_image_os(flash, header))
  80 #endif
  81         {
  82                 /* Load u-boot, mkimage header is 64 bytes. */
  83                 err = spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS, 0x40,
  84                                      (void *)header);
  85                 if (err)
  86                         return err;
  87
  88                 err = spl_parse_image_header(header);
  89                 if (err)
  90                         return err;
  91                 err = spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS,
  92                                spl_image.size, (void *)spl_image.load_addr);
  93         }
  94
  95         return err;
  96 }