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         /* Read for a header, parse or error out. */
  27         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS, 0x40,
  28                        (void *)header);
  29
  30         if (image_get_magic(header) != IH_MAGIC)
  31                 return -1;
  32
  33         spl_parse_image_header(header);
  34
  35         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS,
  36                        spl_image.size, (void *)spl_image.load_addr);
  37
  38         /* Read device tree. */
  39         spi_flash_read(flash, CONFIG_SYS_SPI_ARGS_OFFS,
  40                        CONFIG_SYS_SPI_ARGS_SIZE,
  41                        (void *)CONFIG_SYS_SPL_ARGS_ADDR);
  42
  43         return 0;
  44 }
  45 #endif
  46
  47 /*
  48  * The main entry for SPI booting. It's necessary that SDRAM is already
  49  * configured and available since this code loads the main U-Boot image
  50  * from SPI into SDRAM and starts it from there.
  51  */
  52 int spl_spi_load_image(void)
  53 {
  54         int err = 0;
  55         struct spi_flash *flash;
  56         struct image_header *header;
  57
  58         /*
  59          * Load U-Boot image from SPI flash into RAM
  60          */
  61
  62         flash = spi_flash_probe(CONFIG_SF_DEFAULT_BUS,
  63                                 CONFIG_SF_DEFAULT_CS,
  64                                 CONFIG_SF_DEFAULT_SPEED,
  65                                 CONFIG_SF_DEFAULT_MODE);
  66         if (!flash) {
  67                 puts("SPI probe failed.\n");
  68                 return -ENODEV;
  69         }
  70
  71         /* use CONFIG_SYS_TEXT_BASE as temporary storage area */
  72         header = (struct image_header *)(CONFIG_SYS_TEXT_BASE);
  73
  74 #ifdef CONFIG_SPL_OS_BOOT
  75         if (spl_start_uboot() || spi_load_image_os(flash, header))
  76 #endif
  77         {
  78                 /* Load u-boot, mkimage header is 64 bytes. */
  79                 err = spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS, 0x40,
  80                                      (void *)header);
  81                 if (err)
  82                         return err;
  83
  84                 spl_parse_image_header(header);
  85                 err = spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS,
  86                                spl_image.size, (void *)spl_image.load_addr);
  87         }
  88
  89         return err;
  90 }