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