blob: 81a72cc263f9ea0044a03ab39e65ae1214571c39 [file] [log] [blame]
Tom Rini10e47792018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
Philipp Tomsich5c360af2017-07-19 22:04:32 +02002/*
3 * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
Philipp Tomsich5c360af2017-07-19 22:04:32 +02004 */
5
6#include <common.h>
7#include <dm.h>
8#include <mmc.h>
9#include <spl.h>
10
11#if CONFIG_IS_ENABLED(OF_CONTROL)
Philipp Tomsich1c4f63a2017-09-29 19:27:56 +020012/**
13 * spl_node_to_boot_device() - maps from a DT-node to a SPL boot device
14 * @node: of_offset of the node
15 *
16 * The SPL framework uses BOOT_DEVICE_... constants to identify its boot
17 * sources. These may take on a device-specific meaning, depending on
18 * what nodes are enabled in a DTS (e.g. BOOT_DEVICE_MMC1 may refer to
19 * different controllers/block-devices, depending on which SD/MMC controllers
20 * are enabled in any given DTS). This function maps from a DT-node back
21 * onto a BOOT_DEVICE_... constant, considering the currently active devices.
22 *
23 * Returns
24 * -ENOENT, if no device matching the node could be found
25 * -ENOSYS, if the device matching the node can not be mapped onto a
26 * SPL boot device (e.g. the third MMC device)
27 * -1, for unspecified failures
28 * a positive integer (from the BOOT_DEVICE_... family) on succes.
29 */
30
Philipp Tomsich5c360af2017-07-19 22:04:32 +020031static int spl_node_to_boot_device(int node)
32{
33 struct udevice *parent;
34
35 /*
36 * This should eventually move into the SPL code, once SPL becomes
37 * aware of the block-device layer. Until then (and to avoid unneeded
38 * delays in getting this feature out, it lives at the board-level).
39 */
40 if (!uclass_get_device_by_of_offset(UCLASS_MMC, node, &parent)) {
41 struct udevice *dev;
42 struct blk_desc *desc = NULL;
43
44 for (device_find_first_child(parent, &dev);
45 dev;
46 device_find_next_child(&dev)) {
47 if (device_get_uclass_id(dev) == UCLASS_BLK) {
48 desc = dev_get_uclass_platdata(dev);
49 break;
50 }
51 }
52
53 if (!desc)
54 return -ENOENT;
55
56 switch (desc->devnum) {
57 case 0:
58 return BOOT_DEVICE_MMC1;
59 case 1:
60 return BOOT_DEVICE_MMC2;
61 default:
62 return -ENOSYS;
63 }
64 }
65
66 /*
67 * SPL doesn't differentiate SPI flashes, so we keep the detection
68 * brief and inaccurate... hopefully, the common SPL layer can be
69 * extended with awareness of the BLK layer (and matching OF_CONTROL)
70 * soon.
71 */
72 if (!uclass_get_device_by_of_offset(UCLASS_SPI_FLASH, node, &parent))
73 return BOOT_DEVICE_SPI;
74
75 return -1;
76}
77
Philipp Tomsichec83ff52017-09-29 19:27:57 +020078/**
79 * board_spl_was_booted_from() - retrieves the of-path the SPL was loaded from
80 *
81 * To support a 'same-as-spl' specification in the search-order for the next
82 * stage, we need a SoC- or board-specific way to handshake with what 'came
83 * before us' (either a BROM or TPL stage) and map the info retrieved onto
84 * a OF path.
85 *
86 * Returns
87 * NULL, on failure or if the device could not be identified
88 * a of_path (a string), on success
89 */
90__weak const char *board_spl_was_booted_from(void)
91{
92 debug("%s: no support for 'same-as-spl' for this board\n", __func__);
93 return NULL;
94}
95
Philipp Tomsich5c360af2017-07-19 22:04:32 +020096void board_boot_order(u32 *spl_boot_list)
97{
98 const void *blob = gd->fdt_blob;
99 int chosen_node = fdt_path_offset(blob, "/chosen");
100 int idx = 0;
101 int elem;
102 int boot_device;
103 int node;
104 const char *conf;
105
106 if (chosen_node < 0) {
107 debug("%s: /chosen not found, using spl_boot_device()\n",
108 __func__);
109 spl_boot_list[0] = spl_boot_device();
110 return;
111 }
112
113 for (elem = 0;
114 (conf = fdt_stringlist_get(blob, chosen_node,
115 "u-boot,spl-boot-order", elem, NULL));
116 elem++) {
Philipp Tomsichec83ff52017-09-29 19:27:57 +0200117 const char *alias;
118
119 /* Handle the case of 'same device the SPL was loaded from' */
120 if (strncmp(conf, "same-as-spl", 11) == 0) {
121 conf = board_spl_was_booted_from();
122 if (!conf)
123 continue;
124 }
125
Philipp Tomsich5c360af2017-07-19 22:04:32 +0200126 /* First check if the list element is an alias */
Philipp Tomsichec83ff52017-09-29 19:27:57 +0200127 alias = fdt_get_alias(blob, conf);
Philipp Tomsich5c360af2017-07-19 22:04:32 +0200128 if (alias)
129 conf = alias;
130
131 /* Try to resolve the config item (or alias) as a path */
132 node = fdt_path_offset(blob, conf);
133 if (node < 0) {
134 debug("%s: could not find %s in FDT", __func__, conf);
135 continue;
136 }
137
138 /* Try to map this back onto SPL boot devices */
139 boot_device = spl_node_to_boot_device(node);
140 if (boot_device < 0) {
141 debug("%s: could not map node @%x to a boot-device\n",
142 __func__, node);
143 continue;
144 }
145
146 spl_boot_list[idx++] = boot_device;
147 }
148
149 /* If we had no matches, fall back to spl_boot_device */
150 if (idx == 0)
151 spl_boot_list[0] = spl_boot_device();
152}
153#endif