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573a3811 MY |
1 | /* |
2 | * Copyright (C) 2017 Masahiro Yamada <yamada.masahiro@socionext.com> | |
3 | * | |
4 | * Based on drivers/firmware/psci.c from Linux: | |
5 | * Copyright (C) 2015 ARM Limited | |
6 | * | |
7 | * SPDX-License-Identifier: GPL-2.0+ | |
8 | */ | |
9 | ||
10 | #include <common.h> | |
9d922450 | 11 | #include <dm.h> |
573a3811 | 12 | #include <dm/lists.h> |
b08c8c48 | 13 | #include <linux/libfdt.h> |
573a3811 MY |
14 | #include <linux/arm-smccc.h> |
15 | #include <linux/errno.h> | |
af4e6d3a | 16 | #include <linux/printk.h> |
573a3811 MY |
17 | #include <linux/psci.h> |
18 | ||
19 | psci_fn *invoke_psci_fn; | |
20 | ||
21 | static unsigned long __invoke_psci_fn_hvc(unsigned long function_id, | |
22 | unsigned long arg0, unsigned long arg1, | |
23 | unsigned long arg2) | |
24 | { | |
25 | struct arm_smccc_res res; | |
26 | ||
27 | arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); | |
28 | return res.a0; | |
29 | } | |
30 | ||
31 | static unsigned long __invoke_psci_fn_smc(unsigned long function_id, | |
32 | unsigned long arg0, unsigned long arg1, | |
33 | unsigned long arg2) | |
34 | { | |
35 | struct arm_smccc_res res; | |
36 | ||
37 | arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); | |
38 | return res.a0; | |
39 | } | |
40 | ||
41 | static int psci_bind(struct udevice *dev) | |
42 | { | |
43 | /* No SYSTEM_RESET support for PSCI 0.1 */ | |
911f3aef SG |
44 | if (device_is_compatible(dev, "arm,psci-0.2") || |
45 | device_is_compatible(dev, "arm,psci-1.0")) { | |
573a3811 MY |
46 | int ret; |
47 | ||
48 | /* bind psci-sysreset optionally */ | |
49 | ret = device_bind_driver(dev, "psci-sysreset", "psci-sysreset", | |
50 | NULL); | |
51 | if (ret) | |
af4e6d3a | 52 | pr_debug("PSCI System Reset was not bound.\n"); |
573a3811 MY |
53 | } |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | static int psci_probe(struct udevice *dev) | |
59 | { | |
60 | DECLARE_GLOBAL_DATA_PTR; | |
61 | const char *method; | |
62 | ||
da409ccc SG |
63 | method = fdt_stringlist_get(gd->fdt_blob, dev_of_offset(dev), "method", |
64 | 0, NULL); | |
573a3811 | 65 | if (!method) { |
af4e6d3a | 66 | pr_warn("missing \"method\" property\n"); |
573a3811 MY |
67 | return -ENXIO; |
68 | } | |
69 | ||
70 | if (!strcmp("hvc", method)) { | |
71 | invoke_psci_fn = __invoke_psci_fn_hvc; | |
72 | } else if (!strcmp("smc", method)) { | |
73 | invoke_psci_fn = __invoke_psci_fn_smc; | |
74 | } else { | |
af4e6d3a | 75 | pr_warn("invalid \"method\" property: %s\n", method); |
573a3811 MY |
76 | return -EINVAL; |
77 | } | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | static const struct udevice_id psci_of_match[] = { | |
83 | { .compatible = "arm,psci" }, | |
84 | { .compatible = "arm,psci-0.2" }, | |
85 | { .compatible = "arm,psci-1.0" }, | |
86 | {}, | |
87 | }; | |
88 | ||
89 | U_BOOT_DRIVER(psci) = { | |
90 | .name = "psci", | |
91 | .id = UCLASS_FIRMWARE, | |
92 | .of_match = psci_of_match, | |
93 | .bind = psci_bind, | |
94 | .probe = psci_probe, | |
95 | }; |