common/spl/spl_spi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2011 OMICRON electronics GmbH
   4  *
   5  * based on drivers/mtd/nand/raw/nand_spl_load.c
   6  *
   7  * Copyright (C) 2011
   8  * Heiko Schocher, DENX Software Engineering, hs@denx.de.
   9  */
  10
  11 #include <common.h>
  12 #include <image.h>
  13 #include <log.h>
  14 #include <spi.h>
  15 #include <spi_flash.h>
  16 #include <errno.h>
  17 #include <spl.h>
  18 #include <asm/global_data.h>
  19 #include <dm/ofnode.h>
  20
  21 #if CONFIG_IS_ENABLED(OS_BOOT)
  22 /*
  23  * Load the kernel, check for a valid header we can parse, and if found load
  24  * the kernel and then device tree.
  25  */
  26 static int spi_load_image_os(struct spl_image_info *spl_image,
  27                              struct spl_boot_device *bootdev,
  28                              struct spi_flash *flash,
  29                              struct image_header *header)
  30 {
  31         int err;
  32
  33         /* Read for a header, parse or error out. */
  34         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS, sizeof(*header),
  35                        (void *)header);
  36
  37         if (image_get_magic(header) != IH_MAGIC)
  38                 return -1;
  39
  40         err = spl_parse_image_header(spl_image, bootdev, header);
  41         if (err)
  42                 return err;
  43
  44         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS,
  45                        spl_image->size, (void *)spl_image->load_addr);
  46
  47         /* Read device tree. */
  48         spi_flash_read(flash, CONFIG_SYS_SPI_ARGS_OFFS,
  49                        CONFIG_SYS_SPI_ARGS_SIZE,
  50                        (void *)CONFIG_SYS_SPL_ARGS_ADDR);
  51
  52         return 0;
  53 }
  54 #endif
  55
  56 static ulong spl_spi_fit_read(struct spl_load_info *load, ulong sector,
  57                               ulong count, void *buf)
  58 {
  59         struct spi_flash *flash = load->dev;
  60         ulong ret;
  61
  62         ret = spi_flash_read(flash, sector, count, buf);
  63         if (!ret)
  64                 return count;
  65         else
  66                 return 0;
  67 }
  68
  69 unsigned int __weak spl_spi_get_uboot_offs(struct spi_flash *flash)
  70 {
  71         return CONFIG_SYS_SPI_U_BOOT_OFFS;
  72 }
  73
  74 u32 __weak spl_spi_boot_bus(void)
  75 {
  76         return CONFIG_SF_DEFAULT_BUS;
  77 }
  78
  79 u32 __weak spl_spi_boot_cs(void)
  80 {
  81         return CONFIG_SF_DEFAULT_CS;
  82 }
  83
  84 /*
  85  * The main entry for SPI booting. It's necessary that SDRAM is already
  86  * configured and available since this code loads the main U-Boot image
  87  * from SPI into SDRAM and starts it from there.
  88  */
  89 static int spl_spi_load_image(struct spl_image_info *spl_image,
  90                               struct spl_boot_device *bootdev)
  91 {
  92         int err = 0;
  93         unsigned int payload_offs;
  94         struct spi_flash *flash;
  95         struct image_header *header;
  96         unsigned int sf_bus = spl_spi_boot_bus();
  97         unsigned int sf_cs = spl_spi_boot_cs();
  98
  99         /*
 100          * Load U-Boot image from SPI flash into RAM
 101          * In DM mode: defaults speed and mode will be
 102          * taken from DT when available
 103          */
 104         flash = spi_flash_probe(sf_bus, sf_cs,
 105                                 CONFIG_SF_DEFAULT_SPEED,
 106                                 CONFIG_SF_DEFAULT_MODE);
 107         if (!flash) {
 108                 puts("SPI probe failed.\n");
 109                 return -ENODEV;
 110         }
 111
 112         payload_offs = spl_spi_get_uboot_offs(flash);
 113
 114         header = spl_get_load_buffer(-sizeof(*header), sizeof(*header));
 115
 116         if (CONFIG_IS_ENABLED(OF_REAL)) {
 117                 payload_offs = ofnode_conf_read_int("u-boot,spl-payload-offset",
 118                                                     payload_offs);
 119         }
 120
 121 #if CONFIG_IS_ENABLED(OS_BOOT)
 122         if (spl_start_uboot() || spi_load_image_os(spl_image, bootdev, flash, header))
 123 #endif
 124         {
 125                 /* Load u-boot, mkimage header is 64 bytes. */
 126                 err = spi_flash_read(flash, payload_offs, sizeof(*header),
 127                                      (void *)header);
 128                 if (err) {
 129                         debug("%s: Failed to read from SPI flash (err=%d)\n",
 130                               __func__, err);
 131                         return err;
 132                 }
 133
 134                 if (IS_ENABLED(CONFIG_SPL_LOAD_FIT_FULL) &&
 135                     image_get_magic(header) == FDT_MAGIC) {
 136                         err = spi_flash_read(flash, payload_offs,
 137                                              roundup(fdt_totalsize(header), 4),
 138                                              (void *)CONFIG_SYS_LOAD_ADDR);
 139                         if (err)
 140                                 return err;
 141                         err = spl_parse_image_header(spl_image, bootdev,
 142                                         (struct image_header *)CONFIG_SYS_LOAD_ADDR);
 143                 } else if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
 144                            image_get_magic(header) == FDT_MAGIC) {
 145                         struct spl_load_info load;
 146
 147                         debug("Found FIT\n");
 148                         load.dev = flash;
 149                         load.priv = NULL;
 150                         load.filename = NULL;
 151                         load.bl_len = 1;
 152                         load.read = spl_spi_fit_read;
 153                         err = spl_load_simple_fit(spl_image, &load,
 154                                                   payload_offs,
 155                                                   header);
 156                 } else if (IS_ENABLED(CONFIG_SPL_LOAD_IMX_CONTAINER)) {
 157                         struct spl_load_info load;
 158
 159                         load.dev = flash;
 160                         load.priv = NULL;
 161                         load.filename = NULL;
 162                         load.bl_len = 1;
 163                         load.read = spl_spi_fit_read;
 164
 165                         err = spl_load_imx_container(spl_image, &load,
 166                                                      payload_offs);
 167                 } else {
 168                         err = spl_parse_image_header(spl_image, bootdev, header);
 169                         if (err)
 170                                 return err;
 171                         err = spi_flash_read(flash, payload_offs + spl_image->offset,
 172                                              spl_image->size,
 173                                              (void *)spl_image->load_addr);
 174                 }
 175         }
 176
 177         return err;
 178 }
 179 /* Use priorty 1 so that boards can override this */
 180 SPL_LOAD_IMAGE_METHOD("SPI", 1, BOOT_DEVICE_SPI, spl_spi_load_image);