arch/arm/mach-rockchip/spl-boot-order.c

   1 /*
   2  * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <mmc.h>
  10 #include <spl.h>
  11
  12 #if CONFIG_IS_ENABLED(OF_CONTROL)
  13 static int spl_node_to_boot_device(int node)
  14 {
  15         struct udevice *parent;
  16
  17         /*
  18          * This should eventually move into the SPL code, once SPL becomes
  19          * aware of the block-device layer.  Until then (and to avoid unneeded
  20          * delays in getting this feature out, it lives at the board-level).
  21          */
  22         if (!uclass_get_device_by_of_offset(UCLASS_MMC, node, &parent)) {
  23                 struct udevice *dev;
  24                 struct blk_desc *desc = NULL;
  25
  26                 for (device_find_first_child(parent, &dev);
  27                      dev;
  28                      device_find_next_child(&dev)) {
  29                         if (device_get_uclass_id(dev) == UCLASS_BLK) {
  30                                 desc = dev_get_uclass_platdata(dev);
  31                                 break;
  32                         }
  33                 }
  34
  35                 if (!desc)
  36                         return -ENOENT;
  37
  38                 switch (desc->devnum) {
  39                 case 0:
  40                         return BOOT_DEVICE_MMC1;
  41                 case 1:
  42                         return BOOT_DEVICE_MMC2;
  43                 default:
  44                         return -ENOSYS;
  45                 }
  46         }
  47
  48         /*
  49          * SPL doesn't differentiate SPI flashes, so we keep the detection
  50          * brief and inaccurate... hopefully, the common SPL layer can be
  51          * extended with awareness of the BLK layer (and matching OF_CONTROL)
  52          * soon.
  53          */
  54         if (!uclass_get_device_by_of_offset(UCLASS_SPI_FLASH, node, &parent))
  55                 return BOOT_DEVICE_SPI;
  56
  57         return -1;
  58 }
  59
  60 void board_boot_order(u32 *spl_boot_list)
  61 {
  62         const void *blob = gd->fdt_blob;
  63         int chosen_node = fdt_path_offset(blob, "/chosen");
  64         int idx = 0;
  65         int elem;
  66         int boot_device;
  67         int node;
  68         const char *conf;
  69
  70         if (chosen_node < 0) {
  71                 debug("%s: /chosen not found, using spl_boot_device()\n",
  72                       __func__);
  73                 spl_boot_list[0] = spl_boot_device();
  74                 return;
  75         }
  76
  77         for (elem = 0;
  78              (conf = fdt_stringlist_get(blob, chosen_node,
  79                                         "u-boot,spl-boot-order", elem, NULL));
  80              elem++) {
  81                 /* First check if the list element is an alias */
  82                 const char *alias = fdt_get_alias(blob, conf);
  83                 if (alias)
  84                         conf = alias;
  85
  86                 /* Try to resolve the config item (or alias) as a path */
  87                 node = fdt_path_offset(blob, conf);
  88                 if (node < 0) {
  89                         debug("%s: could not find %s in FDT", __func__, conf);
  90                         continue;
  91                 }
  92
  93                 /* Try to map this back onto SPL boot devices */
  94                 boot_device = spl_node_to_boot_device(node);
  95                 if (boot_device < 0) {
  96                         debug("%s: could not map node @%x to a boot-device\n",
  97                               __func__, node);
  98                         continue;
  99                 }
 100
 101                 spl_boot_list[idx++] = boot_device;
 102         }
 103
 104         /* If we had no matches, fall back to spl_boot_device */
 105         if (idx == 0)
 106                 spl_boot_list[0] = spl_boot_device();
 107 }
 108 #endif