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_flash.h>
  14 #include <spl.h>
  15
  16 #ifdef CONFIG_SPL_OS_BOOT
  17 /*
  18  * Load the kernel, check for a valid header we can parse, and if found load
  19  * the kernel and then device tree.
  20  */
  21 static int spi_load_image_os(struct spi_flash *flash,
  22                              struct image_header *header)
  23 {
  24         /* Read for a header, parse or error out. */
  25         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS, 0x40,
  26                        (void *)header);
  27
  28         if (image_get_magic(header) != IH_MAGIC)
  29                 return -1;
  30
  31         spl_parse_image_header(header);
  32
  33         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS,
  34                        spl_image.size, (void *)spl_image.load_addr);
  35
  36         /* Read device tree. */
  37         spi_flash_read(flash, CONFIG_SYS_SPI_ARGS_OFFS,
  38                        CONFIG_SYS_SPI_ARGS_SIZE,
  39                        (void *)CONFIG_SYS_SPL_ARGS_ADDR);
  40
  41         return 0;
  42 }
  43 #endif
  44
  45 /*
  46  * The main entry for SPI booting. It's necessary that SDRAM is already
  47  * configured and available since this code loads the main U-Boot image
  48  * from SPI into SDRAM and starts it from there.
  49  */
  50 void spl_spi_load_image(void)
  51 {
  52         struct spi_flash *flash;
  53         struct image_header *header;
  54
  55         /*
  56          * Load U-Boot image from SPI flash into RAM
  57          */
  58
  59         flash = spi_flash_probe(CONFIG_SPL_SPI_BUS, CONFIG_SPL_SPI_CS,
  60                                 CONFIG_SF_DEFAULT_SPEED, SPI_MODE_3);
  61         if (!flash) {
  62                 puts("SPI probe failed.\n");
  63                 hang();
  64         }
  65
  66         /* use CONFIG_SYS_TEXT_BASE as temporary storage area */
  67         header = (struct image_header *)(CONFIG_SYS_TEXT_BASE);
  68
  69 #ifdef CONFIG_SPL_OS_BOOT
  70         if (spl_start_uboot() || spi_load_image_os(flash, header))
  71 #endif
  72         {
  73                 /* Load u-boot, mkimage header is 64 bytes. */
  74                 spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS, 0x40,
  75                                (void *)header);
  76                 spl_parse_image_header(header);
  77                 spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS,
  78                                spl_image.size, (void *)spl_image.load_addr);
  79         }
  80 }