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2bdd424f WD |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License version 2 as | |
4 | * published by the Free Software Foundation. | |
5 | * | |
6 | * This program is distributed in the hope that it will be useful, | |
7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9 | * GNU General Public License for more details. | |
10 | * | |
11 | * Copyright (C) 2012 ARM Limited | |
12 | * | |
13 | * Author: Will Deacon <will.deacon@arm.com> | |
14 | */ | |
15 | ||
16 | #define pr_fmt(fmt) "psci: " fmt | |
17 | ||
18 | #include <linux/init.h> | |
19 | #include <linux/of.h> | |
e71246a2 AC |
20 | #include <linux/reboot.h> |
21 | #include <linux/pm.h> | |
22 | #include <uapi/linux/psci.h> | |
2bdd424f WD |
23 | |
24 | #include <asm/compiler.h> | |
25 | #include <asm/errno.h> | |
26 | #include <asm/opcodes-sec.h> | |
27 | #include <asm/opcodes-virt.h> | |
28 | #include <asm/psci.h> | |
e71246a2 | 29 | #include <asm/system_misc.h> |
2bdd424f WD |
30 | |
31 | struct psci_operations psci_ops; | |
32 | ||
33 | static int (*invoke_psci_fn)(u32, u32, u32, u32); | |
e71246a2 | 34 | typedef int (*psci_initcall_t)(const struct device_node *); |
2bdd424f WD |
35 | |
36 | enum psci_function { | |
37 | PSCI_FN_CPU_SUSPEND, | |
38 | PSCI_FN_CPU_ON, | |
39 | PSCI_FN_CPU_OFF, | |
40 | PSCI_FN_MIGRATE, | |
e71246a2 AC |
41 | PSCI_FN_AFFINITY_INFO, |
42 | PSCI_FN_MIGRATE_INFO_TYPE, | |
2bdd424f WD |
43 | PSCI_FN_MAX, |
44 | }; | |
45 | ||
46 | static u32 psci_function_id[PSCI_FN_MAX]; | |
47 | ||
2bdd424f WD |
48 | static int psci_to_linux_errno(int errno) |
49 | { | |
50 | switch (errno) { | |
51 | case PSCI_RET_SUCCESS: | |
52 | return 0; | |
e71246a2 | 53 | case PSCI_RET_NOT_SUPPORTED: |
2bdd424f | 54 | return -EOPNOTSUPP; |
e71246a2 | 55 | case PSCI_RET_INVALID_PARAMS: |
2bdd424f | 56 | return -EINVAL; |
e71246a2 | 57 | case PSCI_RET_DENIED: |
2bdd424f WD |
58 | return -EPERM; |
59 | }; | |
60 | ||
61 | return -EINVAL; | |
62 | } | |
63 | ||
2bdd424f WD |
64 | static u32 psci_power_state_pack(struct psci_power_state state) |
65 | { | |
e71246a2 AC |
66 | return ((state.id << PSCI_0_2_POWER_STATE_ID_SHIFT) |
67 | & PSCI_0_2_POWER_STATE_ID_MASK) | | |
68 | ((state.type << PSCI_0_2_POWER_STATE_TYPE_SHIFT) | |
69 | & PSCI_0_2_POWER_STATE_TYPE_MASK) | | |
70 | ((state.affinity_level << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | |
71 | & PSCI_0_2_POWER_STATE_AFFL_MASK); | |
2bdd424f WD |
72 | } |
73 | ||
74 | /* | |
75 | * The following two functions are invoked via the invoke_psci_fn pointer | |
76 | * and will not be inlined, allowing us to piggyback on the AAPCS. | |
77 | */ | |
78 | static noinline int __invoke_psci_fn_hvc(u32 function_id, u32 arg0, u32 arg1, | |
79 | u32 arg2) | |
80 | { | |
81 | asm volatile( | |
82 | __asmeq("%0", "r0") | |
83 | __asmeq("%1", "r1") | |
84 | __asmeq("%2", "r2") | |
85 | __asmeq("%3", "r3") | |
86 | __HVC(0) | |
87 | : "+r" (function_id) | |
88 | : "r" (arg0), "r" (arg1), "r" (arg2)); | |
89 | ||
90 | return function_id; | |
91 | } | |
92 | ||
93 | static noinline int __invoke_psci_fn_smc(u32 function_id, u32 arg0, u32 arg1, | |
94 | u32 arg2) | |
95 | { | |
96 | asm volatile( | |
97 | __asmeq("%0", "r0") | |
98 | __asmeq("%1", "r1") | |
99 | __asmeq("%2", "r2") | |
100 | __asmeq("%3", "r3") | |
101 | __SMC(0) | |
102 | : "+r" (function_id) | |
103 | : "r" (arg0), "r" (arg1), "r" (arg2)); | |
104 | ||
105 | return function_id; | |
106 | } | |
107 | ||
e71246a2 AC |
108 | static int psci_get_version(void) |
109 | { | |
110 | int err; | |
111 | ||
112 | err = invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0); | |
113 | return err; | |
114 | } | |
115 | ||
2bdd424f WD |
116 | static int psci_cpu_suspend(struct psci_power_state state, |
117 | unsigned long entry_point) | |
118 | { | |
119 | int err; | |
120 | u32 fn, power_state; | |
121 | ||
122 | fn = psci_function_id[PSCI_FN_CPU_SUSPEND]; | |
123 | power_state = psci_power_state_pack(state); | |
124 | err = invoke_psci_fn(fn, power_state, entry_point, 0); | |
125 | return psci_to_linux_errno(err); | |
126 | } | |
127 | ||
128 | static int psci_cpu_off(struct psci_power_state state) | |
129 | { | |
130 | int err; | |
131 | u32 fn, power_state; | |
132 | ||
133 | fn = psci_function_id[PSCI_FN_CPU_OFF]; | |
134 | power_state = psci_power_state_pack(state); | |
135 | err = invoke_psci_fn(fn, power_state, 0, 0); | |
136 | return psci_to_linux_errno(err); | |
137 | } | |
138 | ||
139 | static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point) | |
140 | { | |
141 | int err; | |
142 | u32 fn; | |
143 | ||
144 | fn = psci_function_id[PSCI_FN_CPU_ON]; | |
145 | err = invoke_psci_fn(fn, cpuid, entry_point, 0); | |
146 | return psci_to_linux_errno(err); | |
147 | } | |
148 | ||
149 | static int psci_migrate(unsigned long cpuid) | |
150 | { | |
151 | int err; | |
152 | u32 fn; | |
153 | ||
154 | fn = psci_function_id[PSCI_FN_MIGRATE]; | |
155 | err = invoke_psci_fn(fn, cpuid, 0, 0); | |
156 | return psci_to_linux_errno(err); | |
157 | } | |
158 | ||
e71246a2 AC |
159 | static int psci_affinity_info(unsigned long target_affinity, |
160 | unsigned long lowest_affinity_level) | |
161 | { | |
162 | int err; | |
163 | u32 fn; | |
164 | ||
165 | fn = psci_function_id[PSCI_FN_AFFINITY_INFO]; | |
166 | err = invoke_psci_fn(fn, target_affinity, lowest_affinity_level, 0); | |
167 | return err; | |
168 | } | |
2bdd424f | 169 | |
e71246a2 | 170 | static int psci_migrate_info_type(void) |
2bdd424f | 171 | { |
e71246a2 AC |
172 | int err; |
173 | u32 fn; | |
2bdd424f | 174 | |
e71246a2 AC |
175 | fn = psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE]; |
176 | err = invoke_psci_fn(fn, 0, 0, 0); | |
177 | return err; | |
178 | } | |
179 | ||
180 | static int get_set_conduit_method(struct device_node *np) | |
181 | { | |
182 | const char *method; | |
2bdd424f | 183 | |
e71246a2 | 184 | pr_info("probing for conduit method from DT.\n"); |
2bdd424f WD |
185 | |
186 | if (of_property_read_string(np, "method", &method)) { | |
e71246a2 AC |
187 | pr_warn("missing \"method\" property\n"); |
188 | return -ENXIO; | |
2bdd424f WD |
189 | } |
190 | ||
191 | if (!strcmp("hvc", method)) { | |
192 | invoke_psci_fn = __invoke_psci_fn_hvc; | |
193 | } else if (!strcmp("smc", method)) { | |
194 | invoke_psci_fn = __invoke_psci_fn_smc; | |
195 | } else { | |
e71246a2 AC |
196 | pr_warn("invalid \"method\" property: %s\n", method); |
197 | return -EINVAL; | |
198 | } | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd) | |
203 | { | |
204 | invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0); | |
205 | } | |
206 | ||
207 | static void psci_sys_poweroff(void) | |
208 | { | |
209 | invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0); | |
210 | } | |
211 | ||
212 | /* | |
213 | * PSCI Function IDs for v0.2+ are well defined so use | |
214 | * standard values. | |
215 | */ | |
216 | static int psci_0_2_init(struct device_node *np) | |
217 | { | |
218 | int err, ver; | |
219 | ||
220 | err = get_set_conduit_method(np); | |
221 | ||
222 | if (err) | |
223 | goto out_put_node; | |
224 | ||
225 | ver = psci_get_version(); | |
226 | ||
227 | if (ver == PSCI_RET_NOT_SUPPORTED) { | |
228 | /* PSCI v0.2 mandates implementation of PSCI_ID_VERSION. */ | |
229 | pr_err("PSCI firmware does not comply with the v0.2 spec.\n"); | |
230 | err = -EOPNOTSUPP; | |
2bdd424f | 231 | goto out_put_node; |
e71246a2 AC |
232 | } else { |
233 | pr_info("PSCIv%d.%d detected in firmware.\n", | |
234 | PSCI_VERSION_MAJOR(ver), | |
235 | PSCI_VERSION_MINOR(ver)); | |
236 | ||
237 | if (PSCI_VERSION_MAJOR(ver) == 0 && | |
238 | PSCI_VERSION_MINOR(ver) < 2) { | |
239 | err = -EINVAL; | |
240 | pr_err("Conflicting PSCI version detected.\n"); | |
241 | goto out_put_node; | |
242 | } | |
2bdd424f WD |
243 | } |
244 | ||
e71246a2 AC |
245 | pr_info("Using standard PSCI v0.2 function IDs\n"); |
246 | psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_0_2_FN_CPU_SUSPEND; | |
247 | psci_ops.cpu_suspend = psci_cpu_suspend; | |
248 | ||
249 | psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF; | |
250 | psci_ops.cpu_off = psci_cpu_off; | |
251 | ||
252 | psci_function_id[PSCI_FN_CPU_ON] = PSCI_0_2_FN_CPU_ON; | |
253 | psci_ops.cpu_on = psci_cpu_on; | |
254 | ||
255 | psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN_MIGRATE; | |
256 | psci_ops.migrate = psci_migrate; | |
257 | ||
258 | psci_function_id[PSCI_FN_AFFINITY_INFO] = PSCI_0_2_FN_AFFINITY_INFO; | |
259 | psci_ops.affinity_info = psci_affinity_info; | |
260 | ||
261 | psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE] = | |
262 | PSCI_0_2_FN_MIGRATE_INFO_TYPE; | |
263 | psci_ops.migrate_info_type = psci_migrate_info_type; | |
264 | ||
265 | arm_pm_restart = psci_sys_reset; | |
266 | ||
267 | pm_power_off = psci_sys_poweroff; | |
268 | ||
269 | out_put_node: | |
270 | of_node_put(np); | |
271 | return err; | |
272 | } | |
273 | ||
274 | /* | |
275 | * PSCI < v0.2 get PSCI Function IDs via DT. | |
276 | */ | |
277 | static int psci_0_1_init(struct device_node *np) | |
278 | { | |
279 | u32 id; | |
280 | int err; | |
281 | ||
282 | err = get_set_conduit_method(np); | |
283 | ||
284 | if (err) | |
285 | goto out_put_node; | |
286 | ||
287 | pr_info("Using PSCI v0.1 Function IDs from DT\n"); | |
288 | ||
2bdd424f WD |
289 | if (!of_property_read_u32(np, "cpu_suspend", &id)) { |
290 | psci_function_id[PSCI_FN_CPU_SUSPEND] = id; | |
291 | psci_ops.cpu_suspend = psci_cpu_suspend; | |
292 | } | |
293 | ||
294 | if (!of_property_read_u32(np, "cpu_off", &id)) { | |
295 | psci_function_id[PSCI_FN_CPU_OFF] = id; | |
296 | psci_ops.cpu_off = psci_cpu_off; | |
297 | } | |
298 | ||
299 | if (!of_property_read_u32(np, "cpu_on", &id)) { | |
300 | psci_function_id[PSCI_FN_CPU_ON] = id; | |
301 | psci_ops.cpu_on = psci_cpu_on; | |
302 | } | |
303 | ||
304 | if (!of_property_read_u32(np, "migrate", &id)) { | |
305 | psci_function_id[PSCI_FN_MIGRATE] = id; | |
306 | psci_ops.migrate = psci_migrate; | |
307 | } | |
308 | ||
309 | out_put_node: | |
310 | of_node_put(np); | |
e71246a2 AC |
311 | return err; |
312 | } | |
313 | ||
314 | static const struct of_device_id psci_of_match[] __initconst = { | |
315 | { .compatible = "arm,psci", .data = psci_0_1_init}, | |
316 | { .compatible = "arm,psci-0.2", .data = psci_0_2_init}, | |
317 | {}, | |
318 | }; | |
319 | ||
320 | int __init psci_init(void) | |
321 | { | |
322 | struct device_node *np; | |
323 | const struct of_device_id *matched_np; | |
324 | psci_initcall_t init_fn; | |
325 | ||
326 | np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np); | |
327 | if (!np) | |
328 | return -ENODEV; | |
329 | ||
330 | init_fn = (psci_initcall_t)matched_np->data; | |
331 | return init_fn(np); | |
2bdd424f | 332 | } |