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Tom Rini83d290c2018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
Masahiro Yamada573a3812017-04-14 11:10:24 +09002/*
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
Masahiro Yamada573a3812017-04-14 11:10:24 +09007 */
8
9#include <common.h>
Simon Glass09140112020-05-10 11:40:03 -060010#include <command.h>
Simon Glass9d922452017-05-17 17:18:03 -060011#include <dm.h>
Etienne Carriereb1ff3992022-06-01 10:27:32 +020012#include <efi_loader.h>
Simon Glass36bf4462019-11-14 12:57:42 -070013#include <irq_func.h>
Etienne Carriere2fbe47b2022-06-01 10:27:33 +020014#include <linker_lists.h>
Simon Glassf7ae49f2020-05-10 11:40:05 -060015#include <log.h>
Igor Opaniukb7135b02021-04-01 02:01:53 +030016#include <sysreset.h>
Etienne Carriereb1ff3992022-06-01 10:27:32 +020017#include <asm/system.h>
Etienne Carriere2fbe47b2022-06-01 10:27:33 +020018#include <dm/device-internal.h>
Etienne Carriereb1ff3992022-06-01 10:27:32 +020019#include <dm/lists.h>
Masahiro Yamada573a3812017-04-14 11:10:24 +090020#include <linux/arm-smccc.h>
Etienne Carriereb1ff3992022-06-01 10:27:32 +020021#include <linux/delay.h>
Masahiro Yamada573a3812017-04-14 11:10:24 +090022#include <linux/errno.h>
Etienne Carriereb1ff3992022-06-01 10:27:32 +020023#include <linux/libfdt.h>
Masahiro Yamadaaf4e6d32017-11-29 15:04:40 +090024#include <linux/printk.h>
Masahiro Yamada573a3812017-04-14 11:10:24 +090025#include <linux/psci.h>
26
Heinrich Schuchardt81ea0082018-10-18 12:29:40 +020027#define DRIVER_NAME "psci"
Masahiro Yamada573a3812017-04-14 11:10:24 +090028
Heinrich Schuchardt81ea0082018-10-18 12:29:40 +020029#define PSCI_METHOD_HVC 1
30#define PSCI_METHOD_SMC 2
31
Igor Opaniukb7135b02021-04-01 02:01:53 +030032/*
33 * While a 64-bit OS can make calls with SMC32 calling conventions, for some
34 * calls it is necessary to use SMC64 to pass or return 64-bit values.
35 * For such calls PSCI_FN_NATIVE(version, name) will choose the appropriate
36 * (native-width) function ID.
37 */
38#if defined(CONFIG_ARM64)
39#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name
40#else
41#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN_##name
42#endif
43
Yann Gautier5cc7df72020-07-17 14:20:15 +020044#if CONFIG_IS_ENABLED(EFI_LOADER)
Heinrich Schuchardt81ea0082018-10-18 12:29:40 +020045int __efi_runtime_data psci_method;
Yann Gautier5cc7df72020-07-17 14:20:15 +020046#else
Marek BehĂșn236f2ec2021-05-20 13:23:52 +020047int psci_method __section(".data");
Yann Gautier5cc7df72020-07-17 14:20:15 +020048#endif
Heinrich Schuchardt81ea0082018-10-18 12:29:40 +020049
50unsigned long __efi_runtime invoke_psci_fn
51 (unsigned long function_id, unsigned long arg0,
52 unsigned long arg1, unsigned long arg2)
Masahiro Yamada573a3812017-04-14 11:10:24 +090053{
54 struct arm_smccc_res res;
55
Heinrich Schuchardt81ea0082018-10-18 12:29:40 +020056 /*
57 * In the __efi_runtime we need to avoid the switch statement. In some
58 * cases the compiler creates lookup tables to implement switch. These
59 * tables are not correctly relocated when SetVirtualAddressMap is
60 * called.
61 */
62 if (psci_method == PSCI_METHOD_SMC)
63 arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
64 else if (psci_method == PSCI_METHOD_HVC)
65 arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
66 else
67 res.a0 = PSCI_RET_DISABLED;
Masahiro Yamada573a3812017-04-14 11:10:24 +090068 return res.a0;
69}
70
Igor Opaniukeefa9d72021-05-06 17:34:27 +030071static int request_psci_features(u32 psci_func_id)
Igor Opaniukb7135b02021-04-01 02:01:53 +030072{
73 return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
74 psci_func_id, 0, 0);
75}
76
77static u32 psci_0_2_get_version(void)
78{
79 return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
80}
81
82static bool psci_is_system_reset2_supported(void)
83{
84 int ret;
85 u32 ver;
86
87 ver = psci_0_2_get_version();
88
89 if (PSCI_VERSION_MAJOR(ver) >= 1) {
Igor Opaniukeefa9d72021-05-06 17:34:27 +030090 ret = request_psci_features(PSCI_FN_NATIVE(1_1,
91 SYSTEM_RESET2));
Igor Opaniukb7135b02021-04-01 02:01:53 +030092
93 if (ret != PSCI_RET_NOT_SUPPORTED)
94 return true;
95 }
96
97 return false;
98}
99
Etienne Carriere2fbe47b2022-06-01 10:27:33 +0200100static void smccc_invoke_hvc(unsigned long a0, unsigned long a1,
101 unsigned long a2, unsigned long a3,
102 unsigned long a4, unsigned long a5,
103 unsigned long a6, unsigned long a7,
104 struct arm_smccc_res *res)
105{
106 arm_smccc_hvc(a0, a1, a2, a3, a4, a5, a6, a7, res);
107}
108
109static void smccc_invoke_smc(unsigned long a0, unsigned long a1,
110 unsigned long a2, unsigned long a3,
111 unsigned long a4, unsigned long a5,
112 unsigned long a6, unsigned long a7,
113 struct arm_smccc_res *res)
114{
115 arm_smccc_smc(a0, a1, a2, a3, a4, a5, a6, a7, res);
116}
117
118static int bind_smccc_features(struct udevice *dev, int psci_method)
119{
120 struct psci_plat_data *pdata = dev_get_plat(dev);
121 struct arm_smccc_feature *feature;
122 size_t feature_cnt, n;
123
124 if (!IS_ENABLED(CONFIG_ARM_SMCCC_FEATURES))
125 return 0;
126
127 /*
128 * SMCCC features discovery invoke SMCCC standard function ID
129 * ARM_SMCCC_ARCH_FEATURES but this sequence requires that this
130 * standard ARM_SMCCC_ARCH_FEATURES function ID itself is supported.
131 * It is queried here with invoking PSCI_FEATURES known available
132 * from PSCI 1.0.
133 */
134 if (!device_is_compatible(dev, "arm,psci-1.0") ||
135 PSCI_VERSION_MAJOR(psci_0_2_get_version()) == 0)
136 return 0;
137
138 if (request_psci_features(ARM_SMCCC_ARCH_FEATURES) ==
139 PSCI_RET_NOT_SUPPORTED)
140 return 0;
141
142 if (psci_method == PSCI_METHOD_HVC)
143 pdata->invoke_fn = smccc_invoke_hvc;
144 else
145 pdata->invoke_fn = smccc_invoke_smc;
146
147 feature_cnt = ll_entry_count(struct arm_smccc_feature, arm_smccc_feature);
148 feature = ll_entry_start(struct arm_smccc_feature, arm_smccc_feature);
149
150 for (n = 0; n < feature_cnt; n++, feature++) {
151 const char *drv_name = feature->driver_name;
152 struct udevice *dev2;
153 int ret;
154
155 if (!feature->is_supported || !feature->is_supported(pdata->invoke_fn))
156 continue;
157
158 ret = device_bind_driver(dev, drv_name, drv_name, &dev2);
159 if (ret) {
160 pr_warn("%s was not bound: %d, ignore\n", drv_name, ret);
161 continue;
162 }
163
164 dev_set_parent_plat(dev2, dev_get_plat(dev));
165 }
166
167 return 0;
168}
169
Masahiro Yamada573a3812017-04-14 11:10:24 +0900170static int psci_bind(struct udevice *dev)
171{
172 /* No SYSTEM_RESET support for PSCI 0.1 */
Simon Glass911f3ae2017-05-18 20:08:57 -0600173 if (device_is_compatible(dev, "arm,psci-0.2") ||
174 device_is_compatible(dev, "arm,psci-1.0")) {
Masahiro Yamada573a3812017-04-14 11:10:24 +0900175 int ret;
176
177 /* bind psci-sysreset optionally */
178 ret = device_bind_driver(dev, "psci-sysreset", "psci-sysreset",
179 NULL);
180 if (ret)
Masahiro Yamadaaf4e6d32017-11-29 15:04:40 +0900181 pr_debug("PSCI System Reset was not bound.\n");
Masahiro Yamada573a3812017-04-14 11:10:24 +0900182 }
183
Etienne Carriere2fbe47b2022-06-01 10:27:33 +0200184 /* From PSCI v1.0 onward we can discover services through ARM_SMCCC_FEATURE */
185 if (IS_ENABLED(CONFIG_ARM_SMCCC_FEATURES) && device_is_compatible(dev, "arm,psci-1.0"))
186 dev_or_flags(dev, DM_FLAG_PROBE_AFTER_BIND);
187
Masahiro Yamada573a3812017-04-14 11:10:24 +0900188 return 0;
189}
190
191static int psci_probe(struct udevice *dev)
192{
Masahiro Yamada573a3812017-04-14 11:10:24 +0900193 const char *method;
194
Michal Simek10e4d642020-08-13 12:43:22 +0200195#if defined(CONFIG_ARM64)
196 if (current_el() == 3)
197 return -EINVAL;
198#endif
199
Jon Hunterfb264ef2020-06-18 12:54:38 +0100200 method = ofnode_read_string(dev_ofnode(dev), "method");
Masahiro Yamada573a3812017-04-14 11:10:24 +0900201 if (!method) {
Masahiro Yamadaaf4e6d32017-11-29 15:04:40 +0900202 pr_warn("missing \"method\" property\n");
Masahiro Yamada573a3812017-04-14 11:10:24 +0900203 return -ENXIO;
204 }
205
206 if (!strcmp("hvc", method)) {
Heinrich Schuchardt81ea0082018-10-18 12:29:40 +0200207 psci_method = PSCI_METHOD_HVC;
Masahiro Yamada573a3812017-04-14 11:10:24 +0900208 } else if (!strcmp("smc", method)) {
Heinrich Schuchardt81ea0082018-10-18 12:29:40 +0200209 psci_method = PSCI_METHOD_SMC;
Masahiro Yamada573a3812017-04-14 11:10:24 +0900210 } else {
Masahiro Yamadaaf4e6d32017-11-29 15:04:40 +0900211 pr_warn("invalid \"method\" property: %s\n", method);
Masahiro Yamada573a3812017-04-14 11:10:24 +0900212 return -EINVAL;
213 }
214
Etienne Carriere2fbe47b2022-06-01 10:27:33 +0200215 return bind_smccc_features(dev, psci_method);
Masahiro Yamada573a3812017-04-14 11:10:24 +0900216}
217
Heinrich Schuchardt81ea0082018-10-18 12:29:40 +0200218/**
219 * void do_psci_probe() - probe PSCI firmware driver
220 *
221 * Ensure that psci_method is initialized.
222 */
223static void __maybe_unused do_psci_probe(void)
224{
225 struct udevice *dev;
226
227 uclass_get_device_by_name(UCLASS_FIRMWARE, DRIVER_NAME, &dev);
228}
229
230#if IS_ENABLED(CONFIG_EFI_LOADER) && IS_ENABLED(CONFIG_PSCI_RESET)
231efi_status_t efi_reset_system_init(void)
232{
233 do_psci_probe();
234 return EFI_SUCCESS;
235}
236
237void __efi_runtime EFIAPI efi_reset_system(enum efi_reset_type reset_type,
238 efi_status_t reset_status,
239 unsigned long data_size,
240 void *reset_data)
241{
242 if (reset_type == EFI_RESET_COLD ||
243 reset_type == EFI_RESET_WARM ||
244 reset_type == EFI_RESET_PLATFORM_SPECIFIC) {
245 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
246 } else if (reset_type == EFI_RESET_SHUTDOWN) {
247 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
248 }
249 while (1)
250 ;
251}
252#endif /* IS_ENABLED(CONFIG_EFI_LOADER) && IS_ENABLED(CONFIG_PSCI_RESET) */
253
254#ifdef CONFIG_PSCI_RESET
255void reset_misc(void)
256{
257 do_psci_probe();
258 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
259}
260#endif /* CONFIG_PSCI_RESET */
261
Igor Opaniukb7135b02021-04-01 02:01:53 +0300262void psci_sys_reset(u32 type)
263{
264 bool reset2_supported;
265
266 do_psci_probe();
267
268 reset2_supported = psci_is_system_reset2_supported();
269
270 if (type == SYSRESET_WARM && reset2_supported) {
271 /*
272 * reset_type[31] = 0 (architectural)
273 * reset_type[30:0] = 0 (SYSTEM_WARM_RESET)
274 * cookie = 0 (ignored by the implementation)
275 */
276 invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);
277 } else {
278 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
279 }
280}
281
282void psci_sys_poweroff(void)
283{
284 do_psci_probe();
285
286 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
287}
288
Michal Simekbfc05d72021-07-13 16:53:46 +0200289#if IS_ENABLED(CONFIG_CMD_POWEROFF) && !IS_ENABLED(CONFIG_SYSRESET_CMD_POWEROFF)
Simon Glass09140112020-05-10 11:40:03 -0600290int do_poweroff(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
Heinrich Schuchardt81ea0082018-10-18 12:29:40 +0200291{
292 do_psci_probe();
293
294 puts("poweroff ...\n");
295 udelay(50000); /* wait 50 ms */
296
297 disable_interrupts();
298 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
299 enable_interrupts();
300
301 log_err("Power off not supported on this platform\n");
302 return CMD_RET_FAILURE;
303}
304#endif
305
Masahiro Yamada573a3812017-04-14 11:10:24 +0900306static const struct udevice_id psci_of_match[] = {
307 { .compatible = "arm,psci" },
308 { .compatible = "arm,psci-0.2" },
309 { .compatible = "arm,psci-1.0" },
310 {},
311};
312
313U_BOOT_DRIVER(psci) = {
Heinrich Schuchardt81ea0082018-10-18 12:29:40 +0200314 .name = DRIVER_NAME,
Masahiro Yamada573a3812017-04-14 11:10:24 +0900315 .id = UCLASS_FIRMWARE,
316 .of_match = psci_of_match,
317 .bind = psci_bind,
318 .probe = psci_probe,
Etienne Carriere2fbe47b2022-06-01 10:27:33 +0200319#ifdef CONFIG_ARM_SMCCC_FEATURES
320 .plat_auto = sizeof(struct psci_plat_data),
321#endif
Peng Fan1bd790b2023-04-06 18:23:17 +0800322 .flags = DM_FLAG_PRE_RELOC,
Masahiro Yamada573a3812017-04-14 11:10:24 +0900323};