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>
17 #include <linux/delay.h>
18 #include <linux/libfdt.h>
19 #include <linux/arm-smccc.h>
20 #include <linux/errno.h>
21 #include <linux/printk.h>
22 #include <linux/psci.h>
23 #include <asm/system.h>
25 #define DRIVER_NAME "psci"
27 #define PSCI_METHOD_HVC 1
28 #define PSCI_METHOD_SMC 2
31 * While a 64-bit OS can make calls with SMC32 calling conventions, for some
32 * calls it is necessary to use SMC64 to pass or return 64-bit values.
33 * For such calls PSCI_FN_NATIVE(version, name) will choose the appropriate
34 * (native-width) function ID.
36 #if defined(CONFIG_ARM64)
37 #define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name
39 #define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN_##name
42 #if CONFIG_IS_ENABLED(EFI_LOADER)
43 int __efi_runtime_data psci_method;
45 int psci_method __section(".data");
48 unsigned long __efi_runtime invoke_psci_fn
49 (unsigned long function_id, unsigned long arg0,
50 unsigned long arg1, unsigned long arg2)
52 struct arm_smccc_res res;
55 * In the __efi_runtime we need to avoid the switch statement. In some
56 * cases the compiler creates lookup tables to implement switch. These
57 * tables are not correctly relocated when SetVirtualAddressMap is
60 if (psci_method == PSCI_METHOD_SMC)
61 arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
62 else if (psci_method == PSCI_METHOD_HVC)
63 arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
65 res.a0 = PSCI_RET_DISABLED;
69 static int request_psci_features(u32 psci_func_id)
71 return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
75 static u32 psci_0_2_get_version(void)
77 return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
80 static bool psci_is_system_reset2_supported(void)
85 ver = psci_0_2_get_version();
87 if (PSCI_VERSION_MAJOR(ver) >= 1) {
88 ret = request_psci_features(PSCI_FN_NATIVE(1_1,
91 if (ret != PSCI_RET_NOT_SUPPORTED)
98 static int psci_bind(struct udevice *dev)
100 /* No SYSTEM_RESET support for PSCI 0.1 */
101 if (device_is_compatible(dev, "arm,psci-0.2") ||
102 device_is_compatible(dev, "arm,psci-1.0")) {
105 /* bind psci-sysreset optionally */
106 ret = device_bind_driver(dev, "psci-sysreset", "psci-sysreset",
109 pr_debug("PSCI System Reset was not bound.\n");
115 static int psci_probe(struct udevice *dev)
119 #if defined(CONFIG_ARM64)
120 if (current_el() == 3)
124 method = ofnode_read_string(dev_ofnode(dev), "method");
126 pr_warn("missing \"method\" property\n");
130 if (!strcmp("hvc", method)) {
131 psci_method = PSCI_METHOD_HVC;
132 } else if (!strcmp("smc", method)) {
133 psci_method = PSCI_METHOD_SMC;
135 pr_warn("invalid \"method\" property: %s\n", method);
143 * void do_psci_probe() - probe PSCI firmware driver
145 * Ensure that psci_method is initialized.
147 static void __maybe_unused do_psci_probe(void)
151 uclass_get_device_by_name(UCLASS_FIRMWARE, DRIVER_NAME, &dev);
154 #if IS_ENABLED(CONFIG_EFI_LOADER) && IS_ENABLED(CONFIG_PSCI_RESET)
155 efi_status_t efi_reset_system_init(void)
161 void __efi_runtime EFIAPI efi_reset_system(enum efi_reset_type reset_type,
162 efi_status_t reset_status,
163 unsigned long data_size,
166 if (reset_type == EFI_RESET_COLD ||
167 reset_type == EFI_RESET_WARM ||
168 reset_type == EFI_RESET_PLATFORM_SPECIFIC) {
169 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
170 } else if (reset_type == EFI_RESET_SHUTDOWN) {
171 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
176 #endif /* IS_ENABLED(CONFIG_EFI_LOADER) && IS_ENABLED(CONFIG_PSCI_RESET) */
178 #ifdef CONFIG_PSCI_RESET
179 void reset_misc(void)
182 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
184 #endif /* CONFIG_PSCI_RESET */
186 void psci_sys_reset(u32 type)
188 bool reset2_supported;
192 reset2_supported = psci_is_system_reset2_supported();
194 if (type == SYSRESET_WARM && reset2_supported) {
196 * reset_type[31] = 0 (architectural)
197 * reset_type[30:0] = 0 (SYSTEM_WARM_RESET)
198 * cookie = 0 (ignored by the implementation)
200 invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);
202 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
206 void psci_sys_poweroff(void)
210 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
213 #if IS_ENABLED(CONFIG_CMD_POWEROFF) && !IS_ENABLED(CONFIG_SYSRESET_CMD_POWEROFF)
214 int do_poweroff(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
218 puts("poweroff ...\n");
219 udelay(50000); /* wait 50 ms */
221 disable_interrupts();
222 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
225 log_err("Power off not supported on this platform\n");
226 return CMD_RET_FAILURE;
230 static const struct udevice_id psci_of_match[] = {
231 { .compatible = "arm,psci" },
232 { .compatible = "arm,psci-0.2" },
233 { .compatible = "arm,psci-1.0" },
237 U_BOOT_DRIVER(psci) = {
239 .id = UCLASS_FIRMWARE,
240 .of_match = psci_of_match,