common/spl/spl_spi.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(&spl_image, 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 static ulong spl_spi_fit_read(struct spl_load_info *load, ulong sector,
  52                               ulong count, void *buf)
  53 {
  54         struct spi_flash *flash = load->dev;
  55         ulong ret;
  56
  57         ret = spi_flash_read(flash, sector, count, buf);
  58         if (!ret)
  59                 return count;
  60         else
  61                 return 0;
  62 }
  63 /*
  64  * The main entry for SPI booting. It's necessary that SDRAM is already
  65  * configured and available since this code loads the main U-Boot image
  66  * from SPI into SDRAM and starts it from there.
  67  */
  68 static int spl_spi_load_image(struct spl_boot_device *bootdev)
  69 {
  70         int err = 0;
  71         struct spi_flash *flash;
  72         struct image_header *header;
  73
  74         /*
  75          * Load U-Boot image from SPI flash into RAM
  76          */
  77
  78         flash = spi_flash_probe(CONFIG_SF_DEFAULT_BUS,
  79                                 CONFIG_SF_DEFAULT_CS,
  80                                 CONFIG_SF_DEFAULT_SPEED,
  81                                 CONFIG_SF_DEFAULT_MODE);
  82         if (!flash) {
  83                 puts("SPI probe failed.\n");
  84                 return -ENODEV;
  85         }
  86
  87         /* use CONFIG_SYS_TEXT_BASE as temporary storage area */
  88         header = (struct image_header *)(CONFIG_SYS_TEXT_BASE);
  89
  90 #ifdef CONFIG_SPL_OS_BOOT
  91         if (spl_start_uboot() || spi_load_image_os(flash, header))
  92 #endif
  93         {
  94                 /* Load u-boot, mkimage header is 64 bytes. */
  95                 err = spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS, 0x40,
  96                                      (void *)header);
  97                 if (err)
  98                         return err;
  99
 100                 if (IS_ENABLED(CONFIG_SPL_LOAD_FIT)) {
 101                         struct spl_load_info load;
 102
 103                         debug("Found FIT\n");
 104                         load.dev = flash;
 105                         load.priv = NULL;
 106                         load.filename = NULL;
 107                         load.bl_len = 1;
 108                         load.read = spl_spi_fit_read;
 109                         err = spl_load_simple_fit(&load,
 110                                                   CONFIG_SYS_SPI_U_BOOT_OFFS,
 111                                                   header);
 112                 } else {
 113                         err = spl_parse_image_header(&spl_image, header);
 114                         if (err)
 115                                 return err;
 116                         err = spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS,
 117                                              spl_image.size,
 118                                              (void *)spl_image.load_addr);
 119                 }
 120         }
 121
 122         return err;
 123 }
 124 /* Use priorty 1 so that boards can override this */
 125 SPL_LOAD_IMAGE_METHOD(1, BOOT_DEVICE_SPI, spl_spi_load_image);