blob: f25cd79c8a79f834f8d3e169684d20ee4ced08e6 [file] [log] [blame]
Mark Rutlandbff60792015-07-31 15:46:16 +01001/*
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) 2015 ARM Limited
12 */
13
14#define pr_fmt(fmt) "psci: " fmt
15
Jens Wiklandere6796602016-01-04 15:46:47 +010016#include <linux/arm-smccc.h>
Mark Rutlandbff60792015-07-31 15:46:16 +010017#include <linux/errno.h>
18#include <linux/linkage.h>
19#include <linux/of.h>
20#include <linux/pm.h>
21#include <linux/printk.h>
22#include <linux/psci.h>
23#include <linux/reboot.h>
Sudeep Hollafaf7ec42015-06-18 15:41:34 +010024#include <linux/suspend.h>
Mark Rutlandbff60792015-07-31 15:46:16 +010025
26#include <uapi/linux/psci.h>
27
28#include <asm/cputype.h>
29#include <asm/system_misc.h>
30#include <asm/smp_plat.h>
Sudeep Hollafaf7ec42015-06-18 15:41:34 +010031#include <asm/suspend.h>
Mark Rutlandbff60792015-07-31 15:46:16 +010032
33/*
Mark Rutland5211df02015-07-31 15:46:17 +010034 * While a 64-bit OS can make calls with SMC32 calling conventions, for some
Sudeep Holla029180b2015-06-18 15:41:33 +010035 * calls it is necessary to use SMC64 to pass or return 64-bit values.
36 * For such calls PSCI_FN_NATIVE(version, name) will choose the appropriate
37 * (native-width) function ID.
Mark Rutland5211df02015-07-31 15:46:17 +010038 */
39#ifdef CONFIG_64BIT
Sudeep Holla029180b2015-06-18 15:41:33 +010040#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name
Mark Rutland5211df02015-07-31 15:46:17 +010041#else
Sudeep Holla029180b2015-06-18 15:41:33 +010042#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN_##name
Mark Rutland5211df02015-07-31 15:46:17 +010043#endif
44
45/*
Mark Rutlandbff60792015-07-31 15:46:16 +010046 * The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF
47 * calls to its resident CPU, so we must avoid issuing those. We never migrate
48 * a Trusted OS even if it claims to be capable of migration -- doing so will
49 * require cooperation with a Trusted OS driver.
50 */
51static int resident_cpu = -1;
52
53bool psci_tos_resident_on(int cpu)
54{
55 return cpu == resident_cpu;
56}
57
58struct psci_operations psci_ops;
59
60typedef unsigned long (psci_fn)(unsigned long, unsigned long,
61 unsigned long, unsigned long);
Mark Rutlandbff60792015-07-31 15:46:16 +010062static psci_fn *invoke_psci_fn;
63
64enum psci_function {
65 PSCI_FN_CPU_SUSPEND,
66 PSCI_FN_CPU_ON,
67 PSCI_FN_CPU_OFF,
68 PSCI_FN_MIGRATE,
69 PSCI_FN_MAX,
70};
71
72static u32 psci_function_id[PSCI_FN_MAX];
73
Lorenzo Pieralisi068654c2015-05-26 16:49:01 +010074#define PSCI_0_2_POWER_STATE_MASK \
75 (PSCI_0_2_POWER_STATE_ID_MASK | \
76 PSCI_0_2_POWER_STATE_TYPE_MASK | \
77 PSCI_0_2_POWER_STATE_AFFL_MASK)
78
Lorenzo Pieralisia5c00bb2015-05-26 17:10:32 +010079#define PSCI_1_0_EXT_POWER_STATE_MASK \
80 (PSCI_1_0_EXT_POWER_STATE_ID_MASK | \
81 PSCI_1_0_EXT_POWER_STATE_TYPE_MASK)
82
83static u32 psci_cpu_suspend_feature;
84
85static inline bool psci_has_ext_power_state(void)
86{
87 return psci_cpu_suspend_feature &
88 PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK;
89}
90
Lorenzo Pieralisi068654c2015-05-26 16:49:01 +010091bool psci_power_state_loses_context(u32 state)
92{
Lorenzo Pieralisia5c00bb2015-05-26 17:10:32 +010093 const u32 mask = psci_has_ext_power_state() ?
94 PSCI_1_0_EXT_POWER_STATE_TYPE_MASK :
95 PSCI_0_2_POWER_STATE_TYPE_MASK;
96
97 return state & mask;
Lorenzo Pieralisi068654c2015-05-26 16:49:01 +010098}
99
100bool psci_power_state_is_valid(u32 state)
101{
Lorenzo Pieralisia5c00bb2015-05-26 17:10:32 +0100102 const u32 valid_mask = psci_has_ext_power_state() ?
103 PSCI_1_0_EXT_POWER_STATE_MASK :
104 PSCI_0_2_POWER_STATE_MASK;
105
106 return !(state & ~valid_mask);
Lorenzo Pieralisi068654c2015-05-26 16:49:01 +0100107}
108
Jens Wiklandere6796602016-01-04 15:46:47 +0100109static unsigned long __invoke_psci_fn_hvc(unsigned long function_id,
110 unsigned long arg0, unsigned long arg1,
111 unsigned long arg2)
112{
113 struct arm_smccc_res res;
114
115 arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
116 return res.a0;
117}
118
119static unsigned long __invoke_psci_fn_smc(unsigned long function_id,
120 unsigned long arg0, unsigned long arg1,
121 unsigned long arg2)
122{
123 struct arm_smccc_res res;
124
125 arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
126 return res.a0;
127}
128
Mark Rutlandbff60792015-07-31 15:46:16 +0100129static int psci_to_linux_errno(int errno)
130{
131 switch (errno) {
132 case PSCI_RET_SUCCESS:
133 return 0;
134 case PSCI_RET_NOT_SUPPORTED:
135 return -EOPNOTSUPP;
136 case PSCI_RET_INVALID_PARAMS:
Lorenzo Pieralisi2217d7c2015-05-22 14:31:37 +0100137 case PSCI_RET_INVALID_ADDRESS:
Mark Rutlandbff60792015-07-31 15:46:16 +0100138 return -EINVAL;
139 case PSCI_RET_DENIED:
140 return -EPERM;
141 };
142
143 return -EINVAL;
144}
145
146static u32 psci_get_version(void)
147{
148 return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
149}
150
151static int psci_cpu_suspend(u32 state, unsigned long entry_point)
152{
153 int err;
154 u32 fn;
155
156 fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
157 err = invoke_psci_fn(fn, state, entry_point, 0);
158 return psci_to_linux_errno(err);
159}
160
161static int psci_cpu_off(u32 state)
162{
163 int err;
164 u32 fn;
165
166 fn = psci_function_id[PSCI_FN_CPU_OFF];
167 err = invoke_psci_fn(fn, state, 0, 0);
168 return psci_to_linux_errno(err);
169}
170
171static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point)
172{
173 int err;
174 u32 fn;
175
176 fn = psci_function_id[PSCI_FN_CPU_ON];
177 err = invoke_psci_fn(fn, cpuid, entry_point, 0);
178 return psci_to_linux_errno(err);
179}
180
181static int psci_migrate(unsigned long cpuid)
182{
183 int err;
184 u32 fn;
185
186 fn = psci_function_id[PSCI_FN_MIGRATE];
187 err = invoke_psci_fn(fn, cpuid, 0, 0);
188 return psci_to_linux_errno(err);
189}
190
191static int psci_affinity_info(unsigned long target_affinity,
192 unsigned long lowest_affinity_level)
193{
Sudeep Holla029180b2015-06-18 15:41:33 +0100194 return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO),
Mark Rutland5211df02015-07-31 15:46:17 +0100195 target_affinity, lowest_affinity_level, 0);
Mark Rutlandbff60792015-07-31 15:46:16 +0100196}
197
198static int psci_migrate_info_type(void)
199{
200 return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);
201}
202
203static unsigned long psci_migrate_info_up_cpu(void)
204{
Sudeep Holla029180b2015-06-18 15:41:33 +0100205 return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU),
Mark Rutland5211df02015-07-31 15:46:17 +0100206 0, 0, 0);
Mark Rutlandbff60792015-07-31 15:46:16 +0100207}
208
209static int get_set_conduit_method(struct device_node *np)
210{
211 const char *method;
212
213 pr_info("probing for conduit method from DT.\n");
214
215 if (of_property_read_string(np, "method", &method)) {
216 pr_warn("missing \"method\" property\n");
217 return -ENXIO;
218 }
219
220 if (!strcmp("hvc", method)) {
221 invoke_psci_fn = __invoke_psci_fn_hvc;
222 } else if (!strcmp("smc", method)) {
223 invoke_psci_fn = __invoke_psci_fn_smc;
224 } else {
225 pr_warn("invalid \"method\" property: %s\n", method);
226 return -EINVAL;
227 }
228 return 0;
229}
230
231static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
232{
233 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
234}
235
236static void psci_sys_poweroff(void)
237{
238 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
239}
240
Lorenzo Pieralisi5f004e02015-05-26 17:06:21 +0100241static int __init psci_features(u32 psci_func_id)
242{
243 return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
244 psci_func_id, 0, 0);
245}
246
Sudeep Hollafaf7ec42015-06-18 15:41:34 +0100247static int psci_system_suspend(unsigned long unused)
248{
249 return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),
250 virt_to_phys(cpu_resume), 0, 0);
251}
252
253static int psci_system_suspend_enter(suspend_state_t state)
254{
255 return cpu_suspend(0, psci_system_suspend);
256}
257
258static const struct platform_suspend_ops psci_suspend_ops = {
259 .valid = suspend_valid_only_mem,
260 .enter = psci_system_suspend_enter,
261};
262
263static void __init psci_init_system_suspend(void)
264{
265 int ret;
266
267 if (!IS_ENABLED(CONFIG_SUSPEND))
268 return;
269
270 ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND));
271
272 if (ret != PSCI_RET_NOT_SUPPORTED)
273 suspend_set_ops(&psci_suspend_ops);
274}
275
Lorenzo Pieralisia5c00bb2015-05-26 17:10:32 +0100276static void __init psci_init_cpu_suspend(void)
277{
278 int feature = psci_features(psci_function_id[PSCI_FN_CPU_SUSPEND]);
279
280 if (feature != PSCI_RET_NOT_SUPPORTED)
281 psci_cpu_suspend_feature = feature;
282}
283
Mark Rutlandbff60792015-07-31 15:46:16 +0100284/*
285 * Detect the presence of a resident Trusted OS which may cause CPU_OFF to
286 * return DENIED (which would be fatal).
287 */
288static void __init psci_init_migrate(void)
289{
290 unsigned long cpuid;
291 int type, cpu = -1;
292
293 type = psci_ops.migrate_info_type();
294
295 if (type == PSCI_0_2_TOS_MP) {
296 pr_info("Trusted OS migration not required\n");
297 return;
298 }
299
300 if (type == PSCI_RET_NOT_SUPPORTED) {
301 pr_info("MIGRATE_INFO_TYPE not supported.\n");
302 return;
303 }
304
305 if (type != PSCI_0_2_TOS_UP_MIGRATE &&
306 type != PSCI_0_2_TOS_UP_NO_MIGRATE) {
307 pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
308 return;
309 }
310
311 cpuid = psci_migrate_info_up_cpu();
312 if (cpuid & ~MPIDR_HWID_BITMASK) {
313 pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",
314 cpuid);
315 return;
316 }
317
318 cpu = get_logical_index(cpuid);
319 resident_cpu = cpu >= 0 ? cpu : -1;
320
321 pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);
322}
323
324static void __init psci_0_2_set_functions(void)
325{
326 pr_info("Using standard PSCI v0.2 function IDs\n");
Sudeep Holla029180b2015-06-18 15:41:33 +0100327 psci_function_id[PSCI_FN_CPU_SUSPEND] =
328 PSCI_FN_NATIVE(0_2, CPU_SUSPEND);
Mark Rutlandbff60792015-07-31 15:46:16 +0100329 psci_ops.cpu_suspend = psci_cpu_suspend;
330
331 psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF;
332 psci_ops.cpu_off = psci_cpu_off;
333
Sudeep Holla029180b2015-06-18 15:41:33 +0100334 psci_function_id[PSCI_FN_CPU_ON] = PSCI_FN_NATIVE(0_2, CPU_ON);
Mark Rutlandbff60792015-07-31 15:46:16 +0100335 psci_ops.cpu_on = psci_cpu_on;
336
Sudeep Holla029180b2015-06-18 15:41:33 +0100337 psci_function_id[PSCI_FN_MIGRATE] = PSCI_FN_NATIVE(0_2, MIGRATE);
Mark Rutlandbff60792015-07-31 15:46:16 +0100338 psci_ops.migrate = psci_migrate;
339
340 psci_ops.affinity_info = psci_affinity_info;
341
342 psci_ops.migrate_info_type = psci_migrate_info_type;
343
344 arm_pm_restart = psci_sys_reset;
345
346 pm_power_off = psci_sys_poweroff;
347}
348
349/*
350 * Probe function for PSCI firmware versions >= 0.2
351 */
352static int __init psci_probe(void)
353{
354 u32 ver = psci_get_version();
355
356 pr_info("PSCIv%d.%d detected in firmware.\n",
357 PSCI_VERSION_MAJOR(ver),
358 PSCI_VERSION_MINOR(ver));
359
360 if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {
361 pr_err("Conflicting PSCI version detected.\n");
362 return -EINVAL;
363 }
364
365 psci_0_2_set_functions();
366
367 psci_init_migrate();
368
Lorenzo Pieralisi79b04be2015-10-23 15:46:50 +0100369 if (PSCI_VERSION_MAJOR(ver) >= 1) {
370 psci_init_cpu_suspend();
371 psci_init_system_suspend();
372 }
Sudeep Hollafaf7ec42015-06-18 15:41:34 +0100373
Mark Rutlandbff60792015-07-31 15:46:16 +0100374 return 0;
375}
376
377typedef int (*psci_initcall_t)(const struct device_node *);
378
379/*
380 * PSCI init function for PSCI versions >=0.2
381 *
382 * Probe based on PSCI PSCI_VERSION function
383 */
384static int __init psci_0_2_init(struct device_node *np)
385{
386 int err;
387
388 err = get_set_conduit_method(np);
389
390 if (err)
391 goto out_put_node;
392 /*
393 * Starting with v0.2, the PSCI specification introduced a call
394 * (PSCI_VERSION) that allows probing the firmware version, so
395 * that PSCI function IDs and version specific initialization
396 * can be carried out according to the specific version reported
397 * by firmware
398 */
399 err = psci_probe();
400
401out_put_node:
402 of_node_put(np);
403 return err;
404}
405
406/*
407 * PSCI < v0.2 get PSCI Function IDs via DT.
408 */
409static int __init psci_0_1_init(struct device_node *np)
410{
411 u32 id;
412 int err;
413
414 err = get_set_conduit_method(np);
415
416 if (err)
417 goto out_put_node;
418
419 pr_info("Using PSCI v0.1 Function IDs from DT\n");
420
421 if (!of_property_read_u32(np, "cpu_suspend", &id)) {
422 psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
423 psci_ops.cpu_suspend = psci_cpu_suspend;
424 }
425
426 if (!of_property_read_u32(np, "cpu_off", &id)) {
427 psci_function_id[PSCI_FN_CPU_OFF] = id;
428 psci_ops.cpu_off = psci_cpu_off;
429 }
430
431 if (!of_property_read_u32(np, "cpu_on", &id)) {
432 psci_function_id[PSCI_FN_CPU_ON] = id;
433 psci_ops.cpu_on = psci_cpu_on;
434 }
435
436 if (!of_property_read_u32(np, "migrate", &id)) {
437 psci_function_id[PSCI_FN_MIGRATE] = id;
438 psci_ops.migrate = psci_migrate;
439 }
440
441out_put_node:
442 of_node_put(np);
443 return err;
444}
445
Linus Torvaldsc706c7e2015-09-03 16:27:01 -0700446static const struct of_device_id const psci_of_match[] __initconst = {
Mark Rutlandbff60792015-07-31 15:46:16 +0100447 { .compatible = "arm,psci", .data = psci_0_1_init},
448 { .compatible = "arm,psci-0.2", .data = psci_0_2_init},
Lorenzo Pieralisi0fc197c2015-05-26 13:06:57 +0100449 { .compatible = "arm,psci-1.0", .data = psci_0_2_init},
Mark Rutlandbff60792015-07-31 15:46:16 +0100450 {},
451};
452
453int __init psci_dt_init(void)
454{
455 struct device_node *np;
456 const struct of_device_id *matched_np;
457 psci_initcall_t init_fn;
458
459 np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
460
461 if (!np)
462 return -ENODEV;
463
464 init_fn = (psci_initcall_t)matched_np->data;
465 return init_fn(np);
466}
467
468#ifdef CONFIG_ACPI
469/*
470 * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
471 * explicitly clarified in SBBR
472 */
473int __init psci_acpi_init(void)
474{
475 if (!acpi_psci_present()) {
476 pr_info("is not implemented in ACPI.\n");
477 return -EOPNOTSUPP;
478 }
479
480 pr_info("probing for conduit method from ACPI.\n");
481
482 if (acpi_psci_use_hvc())
483 invoke_psci_fn = __invoke_psci_fn_hvc;
484 else
485 invoke_psci_fn = __invoke_psci_fn_smc;
486
487 return psci_probe();
488}
489#endif