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 DECLARE_GLOBAL_DATA_PTR;
  19
  20 #ifdef CONFIG_SPL_OS_BOOT
  21 /*
  22  * Load the kernel, check for a valid header we can parse, and if found load
  23  * the kernel and then device tree.
  24  */
  25 static int spi_load_image_os(struct spl_image_info *spl_image,
  26                              struct spi_flash *flash,
  27                              struct image_header *header)
  28 {
  29         int err;
  30
  31         /* Read for a header, parse or error out. */
  32         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS, 0x40,
  33                        (void *)header);
  34
  35         if (image_get_magic(header) != IH_MAGIC)
  36                 return -1;
  37
  38         err = spl_parse_image_header(spl_image, header);
  39         if (err)
  40                 return err;
  41
  42         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS,
  43                        spl_image->size, (void *)spl_image->load_addr);
  44
  45         /* Read device tree. */
  46         spi_flash_read(flash, CONFIG_SYS_SPI_ARGS_OFFS,
  47                        CONFIG_SYS_SPI_ARGS_SIZE,
  48                        (void *)CONFIG_SYS_SPL_ARGS_ADDR);
  49
  50         return 0;
  51 }
  52 #endif
  53
  54 static ulong spl_spi_fit_read(struct spl_load_info *load, ulong sector,
  55                               ulong count, void *buf)
  56 {
  57         struct spi_flash *flash = load->dev;
  58         ulong ret;
  59
  60         ret = spi_flash_read(flash, sector, count, buf);
  61         if (!ret)
  62                 return count;
  63         else
  64                 return 0;
  65 }
  66 /*
  67  * The main entry for SPI booting. It's necessary that SDRAM is already
  68  * configured and available since this code loads the main U-Boot image
  69  * from SPI into SDRAM and starts it from there.
  70  */
  71 static int spl_spi_load_image(struct spl_image_info *spl_image,
  72                               struct spl_boot_device *bootdev)
  73 {
  74         int err = 0;
  75         unsigned payload_offs = CONFIG_SYS_SPI_U_BOOT_OFFS;
  76         struct spi_flash *flash;
  77         struct image_header *header;
  78
  79         /*
  80          * Load U-Boot image from SPI flash into RAM
  81          */
  82
  83         flash = spi_flash_probe(CONFIG_SF_DEFAULT_BUS,
  84                                 CONFIG_SF_DEFAULT_CS,
  85                                 CONFIG_SF_DEFAULT_SPEED,
  86                                 CONFIG_SF_DEFAULT_MODE);
  87         if (!flash) {
  88                 puts("SPI probe failed.\n");
  89                 return -ENODEV;
  90         }
  91
  92         /* use CONFIG_SYS_TEXT_BASE as temporary storage area */
  93         header = (struct image_header *)(CONFIG_SYS_TEXT_BASE);
  94
  95 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
  96         payload_offs = fdtdec_get_config_int(gd->fdt_blob,
  97                                              "u-boot,spl-payload-offset",
  98                                              payload_offs);
  99 #endif
 100
 101 #ifdef CONFIG_SPL_OS_BOOT
 102         if (spl_start_uboot() || spi_load_image_os(spl_image, flash, header))
 103 #endif
 104         {
 105                 /* Load u-boot, mkimage header is 64 bytes. */
 106                 err = spi_flash_read(flash, payload_offs, 0x40,
 107                                      (void *)header);
 108                 if (err) {
 109                         debug("%s: Failed to read from SPI flash (err=%d)\n",
 110                               __func__, err);
 111                         return err;
 112                 }
 113
 114                 if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
 115                         image_get_magic(header) == FDT_MAGIC) {
 116                         struct spl_load_info load;
 117
 118                         debug("Found FIT\n");
 119                         load.dev = flash;
 120                         load.priv = NULL;
 121                         load.filename = NULL;
 122                         load.bl_len = 1;
 123                         load.read = spl_spi_fit_read;
 124                         err = spl_load_simple_fit(spl_image, &load,
 125                                                   payload_offs,
 126                                                   header);
 127                 } else {
 128                         err = spl_parse_image_header(spl_image, header);
 129                         if (err)
 130                                 return err;
 131                         err = spi_flash_read(flash, payload_offs,
 132                                              spl_image->size,
 133                                              (void *)spl_image->load_addr);
 134                 }
 135         }
 136
 137         return err;
 138 }
 139 /* Use priorty 1 so that boards can override this */
 140 SPL_LOAD_IMAGE_METHOD("SPI", 1, BOOT_DEVICE_SPI, spl_spi_load_image);