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 <spl.h>
  16
  17 #ifdef CONFIG_SPL_OS_BOOT
  18 /*
  19  * Load the kernel, check for a valid header we can parse, and if found load
  20  * the kernel and then device tree.
  21  */
  22 static int spi_load_image_os(struct spi_flash *flash,
  23                              struct image_header *header)
  24 {
  25         /* Read for a header, parse or error out. */
  26         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS, 0x40,
  27                        (void *)header);
  28
  29         if (image_get_magic(header) != IH_MAGIC)
  30                 return -1;
  31
  32         spl_parse_image_header(header);
  33
  34         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS,
  35                        spl_image.size, (void *)spl_image.load_addr);
  36
  37         /* Read device tree. */
  38         spi_flash_read(flash, CONFIG_SYS_SPI_ARGS_OFFS,
  39                        CONFIG_SYS_SPI_ARGS_SIZE,
  40                        (void *)CONFIG_SYS_SPL_ARGS_ADDR);
  41
  42         return 0;
  43 }
  44 #endif
  45
  46 /*
  47  * The main entry for SPI booting. It's necessary that SDRAM is already
  48  * configured and available since this code loads the main U-Boot image
  49  * from SPI into SDRAM and starts it from there.
  50  */
  51 void spl_spi_load_image(void)
  52 {
  53         struct spi_flash *flash;
  54         struct image_header *header;
  55
  56         /*
  57          * Load U-Boot image from SPI flash into RAM
  58          */
  59
  60         flash = spi_flash_probe(CONFIG_SF_DEFAULT_BUS,
  61                                 CONFIG_SF_DEFAULT_CS,
  62                                 CONFIG_SF_DEFAULT_SPEED,
  63                                 CONFIG_SF_DEFAULT_MODE);
  64         if (!flash) {
  65                 puts("SPI probe failed.\n");
  66                 hang();
  67         }
  68
  69         /* use CONFIG_SYS_TEXT_BASE as temporary storage area */
  70         header = (struct image_header *)(CONFIG_SYS_TEXT_BASE);
  71
  72 #ifdef CONFIG_SPL_OS_BOOT
  73         if (spl_start_uboot() || spi_load_image_os(flash, header))
  74 #endif
  75         {
  76                 /* Load u-boot, mkimage header is 64 bytes. */
  77                 spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS, 0x40,
  78                                (void *)header);
  79                 spl_parse_image_header(header);
  80                 spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS,
  81                                spl_image.size, (void *)spl_image.load_addr);
  82         }
  83 }