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Achin Gupta4f6ad662013-10-25 09:08:21 +01001/*
Dan Handleye83b0ca2014-01-14 18:17:09 +00002 * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
Achin Gupta4f6ad662013-10-25 09:08:21 +01003 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * Redistributions of source code must retain the above copyright notice, this
8 * list of conditions and the following disclaimer.
9 *
10 * Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 *
14 * Neither the name of ARM nor the names of its contributors may be used
15 * to endorse or promote products derived from this software without specific
16 * prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
Achin Gupta4f6ad662013-10-25 09:08:21 +010031#include <arch_helpers.h>
Dan Handleyfb42b122014-06-20 09:43:15 +010032#include <arm_gic.h>
Dan Handley2bd4ef22014-04-09 13:14:54 +010033#include <assert.h>
Achin Gupta4f6ad662013-10-25 09:08:21 +010034#include <bakery_lock.h>
35#include <cci400.h>
Juan Castillo4dc4a472014-08-12 11:17:06 +010036#include <debug.h>
Dan Handley2bd4ef22014-04-09 13:14:54 +010037#include <mmio.h>
38#include <platform.h>
Dan Handley1c54d972014-06-20 12:02:01 +010039#include <plat_config.h>
Dan Handleyed6ff952014-05-14 17:44:19 +010040#include <platform_def.h>
Achin Gupta4f6ad662013-10-25 09:08:21 +010041#include <psci.h>
Achin Gupta85876392014-07-31 17:45:51 +010042#include <errno.h>
Dan Handley4d2e49d2014-04-11 11:52:12 +010043#include "drivers/pwrc/fvp_pwrc.h"
Dan Handleyed6ff952014-05-14 17:44:19 +010044#include "fvp_def.h"
45#include "fvp_private.h"
Achin Gupta4f6ad662013-10-25 09:08:21 +010046
47/*******************************************************************************
Achin Gupta85876392014-07-31 17:45:51 +010048 * Private FVP function to program the mailbox for a cpu before it is released
49 * from reset.
50 ******************************************************************************/
51static void fvp_program_mailbox(uint64_t mpidr, uint64_t address)
52{
53 uint64_t linear_id;
54 mailbox_t *fvp_mboxes;
55
56 linear_id = platform_get_core_pos(mpidr);
57 fvp_mboxes = (mailbox_t *)MBOX_BASE;
58 fvp_mboxes[linear_id].value = address;
59 flush_dcache_range((unsigned long) &fvp_mboxes[linear_id],
60 sizeof(unsigned long));
61}
62
63/*******************************************************************************
64 * Function which implements the common FVP specific operations to power down a
65 * cpu in response to a CPU_OFF or CPU_SUSPEND request.
66 ******************************************************************************/
Sandrine Bailleuxa64a8542015-03-05 10:54:34 +000067static void fvp_cpu_pwrdwn_common(void)
Achin Gupta85876392014-07-31 17:45:51 +010068{
Achin Gupta85876392014-07-31 17:45:51 +010069 /* Prevent interrupts from spuriously waking up this cpu */
70 arm_gic_cpuif_deactivate();
71
72 /* Program the power controller to power off this cpu. */
73 fvp_pwrc_write_ppoffr(read_mpidr_el1());
74}
75
76/*******************************************************************************
77 * Function which implements the common FVP specific operations to power down a
78 * cluster in response to a CPU_OFF or CPU_SUSPEND request.
79 ******************************************************************************/
Sandrine Bailleuxa64a8542015-03-05 10:54:34 +000080static void fvp_cluster_pwrdwn_common(void)
Achin Gupta85876392014-07-31 17:45:51 +010081{
82 uint64_t mpidr = read_mpidr_el1();
83
84 /* Disable coherency if this cluster is to be turned off */
85 if (get_plat_config()->flags & CONFIG_HAS_CCI)
86 cci_disable_cluster_coherency(mpidr);
87
88 /* Program the power controller to turn the cluster off */
89 fvp_pwrc_write_pcoffr(mpidr);
90}
91
92/*******************************************************************************
93 * Private FVP function which is used to determine if any platform actions
94 * should be performed for the specified affinity instance given its
95 * state. Nothing needs to be done if the 'state' is not off or if this is not
96 * the highest affinity level which will enter the 'state'.
97 ******************************************************************************/
98static int32_t fvp_do_plat_actions(unsigned int afflvl, unsigned int state)
99{
100 unsigned int max_phys_off_afflvl;
101
102 assert(afflvl <= MPIDR_AFFLVL1);
103
104 if (state != PSCI_STATE_OFF)
105 return -EAGAIN;
106
107 /*
108 * Find the highest affinity level which will be suspended and postpone
109 * all the platform specific actions until that level is hit.
110 */
111 max_phys_off_afflvl = psci_get_max_phys_off_afflvl();
112 assert(max_phys_off_afflvl != PSCI_INVALID_DATA);
113 if (afflvl != max_phys_off_afflvl)
114 return -EAGAIN;
115
116 return 0;
117}
118
119/*******************************************************************************
Vikram Kanigiri3b7c59b2014-03-21 11:57:10 +0000120 * FVP handler called when an affinity instance is about to enter standby.
121 ******************************************************************************/
Soby Mathew74e52a72014-10-02 16:56:51 +0100122void fvp_affinst_standby(unsigned int power_state)
Vikram Kanigiri3b7c59b2014-03-21 11:57:10 +0000123{
Andrew Thoelke42e75a72014-04-28 12:28:39 +0100124 /*
125 * Enter standby state
126 * dsb is good practice before using wfi to enter low power states
127 */
128 dsb();
Vikram Kanigiri3b7c59b2014-03-21 11:57:10 +0000129 wfi();
Vikram Kanigiri3b7c59b2014-03-21 11:57:10 +0000130}
131
132/*******************************************************************************
Achin Gupta4f6ad662013-10-25 09:08:21 +0100133 * FVP handler called when an affinity instance is about to be turned on. The
134 * level and mpidr determine the affinity instance.
135 ******************************************************************************/
136int fvp_affinst_on(unsigned long mpidr,
137 unsigned long sec_entrypoint,
Achin Gupta4f6ad662013-10-25 09:08:21 +0100138 unsigned int afflvl,
139 unsigned int state)
140{
141 int rc = PSCI_E_SUCCESS;
Achin Gupta4f6ad662013-10-25 09:08:21 +0100142 unsigned int psysr;
143
Achin Gupta4f6ad662013-10-25 09:08:21 +0100144 /*
145 * It's possible to turn on only affinity level 0 i.e. a cpu
146 * on the FVP. Ignore any other affinity level.
147 */
148 if (afflvl != MPIDR_AFFLVL0)
Achin Gupta85876392014-07-31 17:45:51 +0100149 return rc;
Achin Gupta4f6ad662013-10-25 09:08:21 +0100150
151 /*
152 * Ensure that we do not cancel an inflight power off request
153 * for the target cpu. That would leave it in a zombie wfi.
154 * Wait for it to power off, program the jump address for the
155 * target cpu and then program the power controller to turn
156 * that cpu on
157 */
158 do {
159 psysr = fvp_pwrc_read_psysr(mpidr);
160 } while (psysr & PSYSR_AFF_L0);
161
Achin Gupta85876392014-07-31 17:45:51 +0100162 fvp_program_mailbox(mpidr, sec_entrypoint);
Achin Gupta4f6ad662013-10-25 09:08:21 +0100163 fvp_pwrc_write_pponr(mpidr);
164
Achin Gupta4f6ad662013-10-25 09:08:21 +0100165 return rc;
166}
167
168/*******************************************************************************
169 * FVP handler called when an affinity instance is about to be turned off. The
170 * level and mpidr determine the affinity instance. The 'state' arg. allows the
171 * platform to decide whether the cluster is being turned off and take apt
172 * actions.
173 *
Achin Gupta9c60d802014-06-26 11:12:37 +0100174 * CAUTION: There is no guarantee that caches will remain turned on across calls
175 * to this function as each affinity level is dealt with. So do not write & read
176 * global variables across calls. It will be wise to do flush a write to the
177 * global to prevent unpredictable results.
Achin Gupta4f6ad662013-10-25 09:08:21 +0100178 ******************************************************************************/
Soby Mathew74e52a72014-10-02 16:56:51 +0100179void fvp_affinst_off(unsigned int afflvl,
Achin Gupta4f6ad662013-10-25 09:08:21 +0100180 unsigned int state)
181{
Achin Gupta85876392014-07-31 17:45:51 +0100182 /* Determine if any platform actions need to be executed */
183 if (fvp_do_plat_actions(afflvl, state) == -EAGAIN)
Soby Mathew74e52a72014-10-02 16:56:51 +0100184 return;
Achin Gupta4f6ad662013-10-25 09:08:21 +0100185
Achin Gupta85876392014-07-31 17:45:51 +0100186 /*
187 * If execution reaches this stage then this affinity level will be
188 * suspended. Perform at least the cpu specific actions followed the
189 * cluster specific operations if applicable.
190 */
191 fvp_cpu_pwrdwn_common();
Achin Gupta4f6ad662013-10-25 09:08:21 +0100192
Achin Gupta85876392014-07-31 17:45:51 +0100193 if (afflvl != MPIDR_AFFLVL0)
194 fvp_cluster_pwrdwn_common();
Achin Gupta4f6ad662013-10-25 09:08:21 +0100195
Achin Gupta4f6ad662013-10-25 09:08:21 +0100196}
197
198/*******************************************************************************
199 * FVP handler called when an affinity instance is about to be suspended. The
200 * level and mpidr determine the affinity instance. The 'state' arg. allows the
201 * platform to decide whether the cluster is being turned off and take apt
202 * actions.
203 *
Achin Gupta9c60d802014-06-26 11:12:37 +0100204 * CAUTION: There is no guarantee that caches will remain turned on across calls
205 * to this function as each affinity level is dealt with. So do not write & read
206 * global variables across calls. It will be wise to do flush a write to the
207 * global to prevent unpredictable results.
Achin Gupta4f6ad662013-10-25 09:08:21 +0100208 ******************************************************************************/
Soby Mathew74e52a72014-10-02 16:56:51 +0100209void fvp_affinst_suspend(unsigned long sec_entrypoint,
Achin Gupta4f6ad662013-10-25 09:08:21 +0100210 unsigned int afflvl,
211 unsigned int state)
212{
Soby Mathewffb4ab12014-09-26 15:08:52 +0100213 unsigned long mpidr;
214
Achin Gupta85876392014-07-31 17:45:51 +0100215 /* Determine if any platform actions need to be executed. */
216 if (fvp_do_plat_actions(afflvl, state) == -EAGAIN)
Soby Mathew74e52a72014-10-02 16:56:51 +0100217 return;
Achin Gupta4f6ad662013-10-25 09:08:21 +0100218
Soby Mathewffb4ab12014-09-26 15:08:52 +0100219 /* Get the mpidr for this cpu */
220 mpidr = read_mpidr_el1();
221
222 /* Program the jump address for the this cpu */
223 fvp_program_mailbox(mpidr, sec_entrypoint);
Achin Gupta4f6ad662013-10-25 09:08:21 +0100224
Achin Gupta85876392014-07-31 17:45:51 +0100225 /* Program the power controller to enable wakeup interrupts. */
226 fvp_pwrc_set_wen(mpidr);
Achin Gupta4f6ad662013-10-25 09:08:21 +0100227
Achin Gupta85876392014-07-31 17:45:51 +0100228 /* Perform the common cpu specific operations */
229 fvp_cpu_pwrdwn_common();
Achin Gupta4f6ad662013-10-25 09:08:21 +0100230
Achin Gupta85876392014-07-31 17:45:51 +0100231 /* Perform the common cluster specific operations */
232 if (afflvl != MPIDR_AFFLVL0)
233 fvp_cluster_pwrdwn_common();
Achin Gupta4f6ad662013-10-25 09:08:21 +0100234}
235
236/*******************************************************************************
237 * FVP handler called when an affinity instance has just been powered on after
238 * being turned off earlier. The level and mpidr determine the affinity
239 * instance. The 'state' arg. allows the platform to decide whether the cluster
240 * was turned off prior to wakeup and do what's necessary to setup it up
241 * correctly.
242 ******************************************************************************/
Soby Mathew74e52a72014-10-02 16:56:51 +0100243void fvp_affinst_on_finish(unsigned int afflvl,
Achin Gupta4f6ad662013-10-25 09:08:21 +0100244 unsigned int state)
245{
Soby Mathewffb4ab12014-09-26 15:08:52 +0100246 unsigned long mpidr;
Achin Gupta4f6ad662013-10-25 09:08:21 +0100247
Achin Gupta85876392014-07-31 17:45:51 +0100248 /* Determine if any platform actions need to be executed. */
249 if (fvp_do_plat_actions(afflvl, state) == -EAGAIN)
Soby Mathew74e52a72014-10-02 16:56:51 +0100250 return;
Achin Gupta4f6ad662013-10-25 09:08:21 +0100251
Soby Mathewffb4ab12014-09-26 15:08:52 +0100252 /* Get the mpidr for this cpu */
253 mpidr = read_mpidr_el1();
254
Achin Gupta85876392014-07-31 17:45:51 +0100255 /* Perform the common cluster specific operations */
256 if (afflvl != MPIDR_AFFLVL0) {
Achin Gupta4f6ad662013-10-25 09:08:21 +0100257 /*
Achin Gupta85876392014-07-31 17:45:51 +0100258 * This CPU might have woken up whilst the cluster was
259 * attempting to power down. In this case the FVP power
260 * controller will have a pending cluster power off request
261 * which needs to be cleared by writing to the PPONR register.
262 * This prevents the power controller from interpreting a
263 * subsequent entry of this cpu into a simple wfi as a power
264 * down request.
Achin Gupta4f6ad662013-10-25 09:08:21 +0100265 */
Achin Gupta85876392014-07-31 17:45:51 +0100266 fvp_pwrc_write_pponr(mpidr);
Achin Gupta4f6ad662013-10-25 09:08:21 +0100267
Achin Gupta85876392014-07-31 17:45:51 +0100268 /* Enable coherency if this cluster was off */
269 fvp_cci_enable();
270 }
Achin Guptab127cdb2013-11-12 16:40:00 +0000271
Achin Gupta85876392014-07-31 17:45:51 +0100272 /*
Achin Gupta85876392014-07-31 17:45:51 +0100273 * Clear PWKUPR.WEN bit to ensure interrupts do not interfere
274 * with a cpu power down unless the bit is set again
275 */
276 fvp_pwrc_clr_wen(mpidr);
Achin Gupta4f6ad662013-10-25 09:08:21 +0100277
Achin Gupta85876392014-07-31 17:45:51 +0100278 /* Zero the jump address in the mailbox for this cpu */
Soby Mathewffb4ab12014-09-26 15:08:52 +0100279 fvp_program_mailbox(mpidr, 0);
Achin Gupta4f6ad662013-10-25 09:08:21 +0100280
Achin Gupta85876392014-07-31 17:45:51 +0100281 /* Enable the gic cpu interface */
282 arm_gic_cpuif_setup();
Achin Gupta4f6ad662013-10-25 09:08:21 +0100283
Achin Gupta85876392014-07-31 17:45:51 +0100284 /* TODO: This setup is needed only after a cold boot */
285 arm_gic_pcpu_distif_setup();
Achin Gupta4f6ad662013-10-25 09:08:21 +0100286}
287
288/*******************************************************************************
289 * FVP handler called when an affinity instance has just been powered on after
290 * having been suspended earlier. The level and mpidr determine the affinity
291 * instance.
292 * TODO: At the moment we reuse the on finisher and reinitialize the secure
293 * context. Need to implement a separate suspend finisher.
294 ******************************************************************************/
Soby Mathew74e52a72014-10-02 16:56:51 +0100295void fvp_affinst_suspend_finish(unsigned int afflvl,
Achin Gupta4f6ad662013-10-25 09:08:21 +0100296 unsigned int state)
297{
Soby Mathew74e52a72014-10-02 16:56:51 +0100298 fvp_affinst_on_finish(afflvl, state);
Achin Gupta4f6ad662013-10-25 09:08:21 +0100299}
300
Juan Castillo4dc4a472014-08-12 11:17:06 +0100301/*******************************************************************************
302 * FVP handlers to shutdown/reboot the system
303 ******************************************************************************/
304static void __dead2 fvp_system_off(void)
305{
306 /* Write the System Configuration Control Register */
307 mmio_write_32(VE_SYSREGS_BASE + V2M_SYS_CFGCTRL,
308 CFGCTRL_START | CFGCTRL_RW | CFGCTRL_FUNC(FUNC_SHUTDOWN));
309 wfi();
310 ERROR("FVP System Off: operation not handled.\n");
311 panic();
312}
313
314static void __dead2 fvp_system_reset(void)
315{
316 /* Write the System Configuration Control Register */
317 mmio_write_32(VE_SYSREGS_BASE + V2M_SYS_CFGCTRL,
318 CFGCTRL_START | CFGCTRL_RW | CFGCTRL_FUNC(FUNC_REBOOT));
319 wfi();
320 ERROR("FVP System Reset: operation not handled.\n");
321 panic();
322}
Achin Gupta4f6ad662013-10-25 09:08:21 +0100323
324/*******************************************************************************
Soby Mathew74e52a72014-10-02 16:56:51 +0100325 * FVP handler called to check the validity of the power state parameter.
326 ******************************************************************************/
327int fvp_validate_power_state(unsigned int power_state)
328{
329 /* Sanity check the requested state */
330 if (psci_get_pstate_type(power_state) == PSTATE_TYPE_STANDBY) {
331 /*
332 * It's possible to enter standby only on affinity level 0
333 * i.e. a cpu on the fvp. Ignore any other affinity level.
334 */
335 if (psci_get_pstate_afflvl(power_state) != MPIDR_AFFLVL0)
336 return PSCI_E_INVALID_PARAMS;
337 }
338
339 /*
340 * We expect the 'state id' to be zero.
341 */
342 if (psci_get_pstate_id(power_state))
343 return PSCI_E_INVALID_PARAMS;
344
345 return PSCI_E_SUCCESS;
346}
347
348/*******************************************************************************
Achin Gupta4f6ad662013-10-25 09:08:21 +0100349 * Export the platform handlers to enable psci to invoke them
350 ******************************************************************************/
Dan Handleya4cb68e2014-04-23 13:47:06 +0100351static const plat_pm_ops_t fvp_plat_pm_ops = {
Juan Castillo4dc4a472014-08-12 11:17:06 +0100352 .affinst_standby = fvp_affinst_standby,
353 .affinst_on = fvp_affinst_on,
354 .affinst_off = fvp_affinst_off,
355 .affinst_suspend = fvp_affinst_suspend,
356 .affinst_on_finish = fvp_affinst_on_finish,
357 .affinst_suspend_finish = fvp_affinst_suspend_finish,
358 .system_off = fvp_system_off,
Soby Mathew74e52a72014-10-02 16:56:51 +0100359 .system_reset = fvp_system_reset,
360 .validate_power_state = fvp_validate_power_state
Achin Gupta4f6ad662013-10-25 09:08:21 +0100361};
362
363/*******************************************************************************
364 * Export the platform specific power ops & initialize the fvp power controller
365 ******************************************************************************/
Dan Handleya4cb68e2014-04-23 13:47:06 +0100366int platform_setup_pm(const plat_pm_ops_t **plat_ops)
Achin Gupta4f6ad662013-10-25 09:08:21 +0100367{
368 *plat_ops = &fvp_plat_pm_ops;
369 return 0;
370}