1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2017 Masahiro Yamada <yamada.masahiro@socionext.com>
5 * Based on drivers/firmware/psci.c from Linux:
6 * Copyright (C) 2015 ARM Limited
15 #include <efi_loader.h>
16 #include <linux/delay.h>
17 #include <linux/libfdt.h>
18 #include <linux/arm-smccc.h>
19 #include <linux/errno.h>
20 #include <linux/printk.h>
21 #include <linux/psci.h>
23 #define DRIVER_NAME "psci"
25 #define PSCI_METHOD_HVC 1
26 #define PSCI_METHOD_SMC 2
28 int __efi_runtime_data psci_method;
30 unsigned long __efi_runtime invoke_psci_fn
31 (unsigned long function_id, unsigned long arg0,
32 unsigned long arg1, unsigned long arg2)
34 struct arm_smccc_res res;
37 * In the __efi_runtime we need to avoid the switch statement. In some
38 * cases the compiler creates lookup tables to implement switch. These
39 * tables are not correctly relocated when SetVirtualAddressMap is
42 if (psci_method == PSCI_METHOD_SMC)
43 arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
44 else if (psci_method == PSCI_METHOD_HVC)
45 arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
47 res.a0 = PSCI_RET_DISABLED;
51 static int psci_bind(struct udevice *dev)
53 /* No SYSTEM_RESET support for PSCI 0.1 */
54 if (device_is_compatible(dev, "arm,psci-0.2") ||
55 device_is_compatible(dev, "arm,psci-1.0")) {
58 /* bind psci-sysreset optionally */
59 ret = device_bind_driver(dev, "psci-sysreset", "psci-sysreset",
62 pr_debug("PSCI System Reset was not bound.\n");
68 static int psci_probe(struct udevice *dev)
70 DECLARE_GLOBAL_DATA_PTR;
73 method = fdt_stringlist_get(gd->fdt_blob, dev_of_offset(dev), "method",
76 pr_warn("missing \"method\" property\n");
80 if (!strcmp("hvc", method)) {
81 psci_method = PSCI_METHOD_HVC;
82 } else if (!strcmp("smc", method)) {
83 psci_method = PSCI_METHOD_SMC;
85 pr_warn("invalid \"method\" property: %s\n", method);
93 * void do_psci_probe() - probe PSCI firmware driver
95 * Ensure that psci_method is initialized.
97 static void __maybe_unused do_psci_probe(void)
101 uclass_get_device_by_name(UCLASS_FIRMWARE, DRIVER_NAME, &dev);
104 #if IS_ENABLED(CONFIG_EFI_LOADER) && IS_ENABLED(CONFIG_PSCI_RESET)
105 efi_status_t efi_reset_system_init(void)
111 void __efi_runtime EFIAPI efi_reset_system(enum efi_reset_type reset_type,
112 efi_status_t reset_status,
113 unsigned long data_size,
116 if (reset_type == EFI_RESET_COLD ||
117 reset_type == EFI_RESET_WARM ||
118 reset_type == EFI_RESET_PLATFORM_SPECIFIC) {
119 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
120 } else if (reset_type == EFI_RESET_SHUTDOWN) {
121 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
126 #endif /* IS_ENABLED(CONFIG_EFI_LOADER) && IS_ENABLED(CONFIG_PSCI_RESET) */
128 #ifdef CONFIG_PSCI_RESET
129 void reset_misc(void)
132 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
134 #endif /* CONFIG_PSCI_RESET */
136 #ifdef CONFIG_CMD_POWEROFF
137 int do_poweroff(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
141 puts("poweroff ...\n");
142 udelay(50000); /* wait 50 ms */
144 disable_interrupts();
145 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
148 log_err("Power off not supported on this platform\n");
149 return CMD_RET_FAILURE;
153 static const struct udevice_id psci_of_match[] = {
154 { .compatible = "arm,psci" },
155 { .compatible = "arm,psci-0.2" },
156 { .compatible = "arm,psci-1.0" },
160 U_BOOT_DRIVER(psci) = {
162 .id = UCLASS_FIRMWARE,
163 .of_match = psci_of_match,