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 spl_image_info *spl_image,
  24                              struct spi_flash *flash,
  25                              struct image_header *header)
  26 {
  27         int err;
  28
  29         /* Read for a header, parse or error out. */
  30         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS, 0x40,
  31                        (void *)header);
  32
  33         if (image_get_magic(header) != IH_MAGIC)
  34                 return -1;
  35
  36         err = spl_parse_image_header(spl_image, header);
  37         if (err)
  38                 return err;
  39
  40         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS,
  41                        spl_image->size, (void *)spl_image->load_addr);
  42
  43         /* Read device tree. */
  44         spi_flash_read(flash, CONFIG_SYS_SPI_ARGS_OFFS,
  45                        CONFIG_SYS_SPI_ARGS_SIZE,
  46                        (void *)CONFIG_SYS_SPL_ARGS_ADDR);
  47
  48         return 0;
  49 }
  50 #endif
  51
  52 static ulong spl_spi_fit_read(struct spl_load_info *load, ulong sector,
  53                               ulong count, void *buf)
  54 {
  55         struct spi_flash *flash = load->dev;
  56         ulong ret;
  57
  58         ret = spi_flash_read(flash, sector, count, buf);
  59         if (!ret)
  60                 return count;
  61         else
  62                 return 0;
  63 }
  64 /*
  65  * The main entry for SPI booting. It's necessary that SDRAM is already
  66  * configured and available since this code loads the main U-Boot image
  67  * from SPI into SDRAM and starts it from there.
  68  */
  69 static int spl_spi_load_image(struct spl_image_info *spl_image,
  70                               struct spl_boot_device *bootdev)
  71 {
  72         int err = 0;
  73         struct spi_flash *flash;
  74         struct image_header *header;
  75
  76         /*
  77          * Load U-Boot image from SPI flash into RAM
  78          */
  79
  80         flash = spi_flash_probe(CONFIG_SF_DEFAULT_BUS,
  81                                 CONFIG_SF_DEFAULT_CS,
  82                                 CONFIG_SF_DEFAULT_SPEED,
  83                                 CONFIG_SF_DEFAULT_MODE);
  84         if (!flash) {
  85                 puts("SPI probe failed.\n");
  86                 return -ENODEV;
  87         }
  88
  89         /* use CONFIG_SYS_TEXT_BASE as temporary storage area */
  90         header = (struct image_header *)(CONFIG_SYS_TEXT_BASE);
  91
  92 #ifdef CONFIG_SPL_OS_BOOT
  93         if (spl_start_uboot() || spi_load_image_os(spl_image, flash, header))
  94 #endif
  95         {
  96                 /* Load u-boot, mkimage header is 64 bytes. */
  97                 err = spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS, 0x40,
  98                                      (void *)header);
  99                 if (err)
 100                         return err;
 101
 102                 if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
 103                         image_get_magic(header) == FDT_MAGIC) {
 104                         struct spl_load_info load;
 105
 106                         debug("Found FIT\n");
 107                         load.dev = flash;
 108                         load.priv = NULL;
 109                         load.filename = NULL;
 110                         load.bl_len = 1;
 111                         load.read = spl_spi_fit_read;
 112                         err = spl_load_simple_fit(spl_image, &load,
 113                                                   CONFIG_SYS_SPI_U_BOOT_OFFS,
 114                                                   header);
 115                 } else {
 116                         err = spl_parse_image_header(spl_image, header);
 117                         if (err)
 118                                 return err;
 119                         err = spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS,
 120                                              spl_image->size,
 121                                              (void *)spl_image->load_addr);
 122                 }
 123         }
 124
 125         return err;
 126 }
 127 /* Use priorty 1 so that boards can override this */
 128 SPL_LOAD_IMAGE_METHOD(1, BOOT_DEVICE_SPI, spl_spi_load_image);