blob: 843998dfdcb8d256bbb5966761273e40805646c6 [file] [log] [blame]
Philipp Tomsich9b0bc592017-07-19 22:04:32 +02001/*
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)
Philipp Tomsichdbad01c2017-09-29 19:27:56 +020013/**
14 * spl_node_to_boot_device() - maps from a DT-node to a SPL boot device
15 * @node: of_offset of the node
16 *
17 * The SPL framework uses BOOT_DEVICE_... constants to identify its boot
18 * sources. These may take on a device-specific meaning, depending on
19 * what nodes are enabled in a DTS (e.g. BOOT_DEVICE_MMC1 may refer to
20 * different controllers/block-devices, depending on which SD/MMC controllers
21 * are enabled in any given DTS). This function maps from a DT-node back
22 * onto a BOOT_DEVICE_... constant, considering the currently active devices.
23 *
24 * Returns
25 * -ENOENT, if no device matching the node could be found
26 * -ENOSYS, if the device matching the node can not be mapped onto a
27 * SPL boot device (e.g. the third MMC device)
28 * -1, for unspecified failures
29 * a positive integer (from the BOOT_DEVICE_... family) on succes.
30 */
31
Philipp Tomsich9b0bc592017-07-19 22:04:32 +020032static int spl_node_to_boot_device(int node)
33{
34 struct udevice *parent;
35
36 /*
37 * This should eventually move into the SPL code, once SPL becomes
38 * aware of the block-device layer. Until then (and to avoid unneeded
39 * delays in getting this feature out, it lives at the board-level).
40 */
41 if (!uclass_get_device_by_of_offset(UCLASS_MMC, node, &parent)) {
42 struct udevice *dev;
43 struct blk_desc *desc = NULL;
44
45 for (device_find_first_child(parent, &dev);
46 dev;
47 device_find_next_child(&dev)) {
48 if (device_get_uclass_id(dev) == UCLASS_BLK) {
49 desc = dev_get_uclass_platdata(dev);
50 break;
51 }
52 }
53
54 if (!desc)
55 return -ENOENT;
56
57 switch (desc->devnum) {
58 case 0:
59 return BOOT_DEVICE_MMC1;
60 case 1:
61 return BOOT_DEVICE_MMC2;
62 default:
63 return -ENOSYS;
64 }
65 }
66
67 /*
68 * SPL doesn't differentiate SPI flashes, so we keep the detection
69 * brief and inaccurate... hopefully, the common SPL layer can be
70 * extended with awareness of the BLK layer (and matching OF_CONTROL)
71 * soon.
72 */
73 if (!uclass_get_device_by_of_offset(UCLASS_SPI_FLASH, node, &parent))
74 return BOOT_DEVICE_SPI;
75
76 return -1;
77}
78
Philipp Tomsich80e9f882017-09-29 19:27:57 +020079/**
80 * board_spl_was_booted_from() - retrieves the of-path the SPL was loaded from
81 *
82 * To support a 'same-as-spl' specification in the search-order for the next
83 * stage, we need a SoC- or board-specific way to handshake with what 'came
84 * before us' (either a BROM or TPL stage) and map the info retrieved onto
85 * a OF path.
86 *
87 * Returns
88 * NULL, on failure or if the device could not be identified
89 * a of_path (a string), on success
90 */
91__weak const char *board_spl_was_booted_from(void)
92{
93 debug("%s: no support for 'same-as-spl' for this board\n", __func__);
94 return NULL;
95}
96
Philipp Tomsich9b0bc592017-07-19 22:04:32 +020097void board_boot_order(u32 *spl_boot_list)
98{
99 const void *blob = gd->fdt_blob;
100 int chosen_node = fdt_path_offset(blob, "/chosen");
101 int idx = 0;
102 int elem;
103 int boot_device;
104 int node;
105 const char *conf;
106
107 if (chosen_node < 0) {
108 debug("%s: /chosen not found, using spl_boot_device()\n",
109 __func__);
110 spl_boot_list[0] = spl_boot_device();
111 return;
112 }
113
114 for (elem = 0;
115 (conf = fdt_stringlist_get(blob, chosen_node,
116 "u-boot,spl-boot-order", elem, NULL));
117 elem++) {
Philipp Tomsich80e9f882017-09-29 19:27:57 +0200118 const char *alias;
119
120 /* Handle the case of 'same device the SPL was loaded from' */
121 if (strncmp(conf, "same-as-spl", 11) == 0) {
122 conf = board_spl_was_booted_from();
123 if (!conf)
124 continue;
125 }
126
Philipp Tomsich9b0bc592017-07-19 22:04:32 +0200127 /* First check if the list element is an alias */
Philipp Tomsich80e9f882017-09-29 19:27:57 +0200128 alias = fdt_get_alias(blob, conf);
Philipp Tomsich9b0bc592017-07-19 22:04:32 +0200129 if (alias)
130 conf = alias;
131
132 /* Try to resolve the config item (or alias) as a path */
133 node = fdt_path_offset(blob, conf);
134 if (node < 0) {
135 debug("%s: could not find %s in FDT", __func__, conf);
136 continue;
137 }
138
139 /* Try to map this back onto SPL boot devices */
140 boot_device = spl_node_to_boot_device(node);
141 if (boot_device < 0) {
142 debug("%s: could not map node @%x to a boot-device\n",
143 __func__, node);
144 continue;
145 }
146
147 spl_boot_list[idx++] = boot_device;
148 }
149
150 /* If we had no matches, fall back to spl_boot_device */
151 if (idx == 0)
152 spl_boot_list[0] = spl_boot_device();
153}
154#endif