Dan Handley | 9df4804 | 2015-03-19 18:58:55 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
| 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 | |
| 31 | #include <assert.h> |
| 32 | #include <arch_helpers.h> |
| 33 | #include <arm_gic.h> |
| 34 | #include <cci.h> |
| 35 | #include <css_def.h> |
| 36 | #include <debug.h> |
| 37 | #include <errno.h> |
| 38 | #include <plat_arm.h> |
| 39 | #include <platform.h> |
| 40 | #include <platform_def.h> |
| 41 | #include <psci.h> |
| 42 | #include "css_scpi.h" |
| 43 | |
| 44 | /******************************************************************************* |
| 45 | * Private function to program the mailbox for a cpu before it is released |
| 46 | * from reset. |
| 47 | ******************************************************************************/ |
| 48 | static void css_program_mailbox(uint64_t mpidr, uint64_t address) |
| 49 | { |
| 50 | uint64_t linear_id; |
| 51 | uint64_t mbox; |
| 52 | |
| 53 | linear_id = platform_get_core_pos(mpidr); |
| 54 | mbox = TRUSTED_MAILBOXES_BASE + (linear_id << TRUSTED_MAILBOX_SHIFT); |
| 55 | *((uint64_t *) mbox) = address; |
| 56 | flush_dcache_range(mbox, sizeof(mbox)); |
| 57 | } |
| 58 | |
| 59 | /******************************************************************************* |
| 60 | * Handler called when an affinity instance is about to be turned on. The |
| 61 | * level and mpidr determine the affinity instance. |
| 62 | ******************************************************************************/ |
| 63 | int32_t css_affinst_on(uint64_t mpidr, |
| 64 | uint64_t sec_entrypoint, |
| 65 | uint32_t afflvl, |
| 66 | uint32_t state) |
| 67 | { |
| 68 | /* |
| 69 | * SCP takes care of powering up higher affinity levels so we |
| 70 | * only need to care about level 0 |
| 71 | */ |
| 72 | if (afflvl != MPIDR_AFFLVL0) |
| 73 | return PSCI_E_SUCCESS; |
| 74 | |
| 75 | /* |
| 76 | * Setup mailbox with address for CPU entrypoint when it next powers up |
| 77 | */ |
| 78 | css_program_mailbox(mpidr, sec_entrypoint); |
| 79 | |
| 80 | scpi_set_css_power_state(mpidr, scpi_power_on, scpi_power_on, |
| 81 | scpi_power_on); |
| 82 | |
| 83 | return PSCI_E_SUCCESS; |
| 84 | } |
| 85 | |
| 86 | /******************************************************************************* |
| 87 | * Handler called when an affinity instance has just been powered on after |
| 88 | * being turned off earlier. The level and mpidr determine the affinity |
| 89 | * instance. The 'state' arg. allows the platform to decide whether the cluster |
| 90 | * was turned off prior to wakeup and do what's necessary to setup it up |
| 91 | * correctly. |
| 92 | ******************************************************************************/ |
| 93 | void css_affinst_on_finish(uint32_t afflvl, uint32_t state) |
| 94 | { |
| 95 | unsigned long mpidr; |
| 96 | |
| 97 | /* Determine if any platform actions need to be executed. */ |
| 98 | if (arm_do_affinst_actions(afflvl, state) == -EAGAIN) |
| 99 | return; |
| 100 | |
| 101 | /* Get the mpidr for this cpu */ |
| 102 | mpidr = read_mpidr_el1(); |
| 103 | |
| 104 | /* |
| 105 | * Perform the common cluster specific operations i.e enable coherency |
| 106 | * if this cluster was off. |
| 107 | */ |
| 108 | if (afflvl != MPIDR_AFFLVL0) |
| 109 | cci_enable_snoop_dvm_reqs(MPIDR_AFFLVL1_VAL(mpidr)); |
| 110 | |
| 111 | /* Enable the gic cpu interface */ |
| 112 | arm_gic_cpuif_setup(); |
| 113 | |
| 114 | /* todo: Is this setup only needed after a cold boot? */ |
| 115 | arm_gic_pcpu_distif_setup(); |
| 116 | |
| 117 | /* Clear the mailbox for this cpu. */ |
| 118 | css_program_mailbox(mpidr, 0); |
| 119 | } |
| 120 | |
| 121 | /******************************************************************************* |
| 122 | * Common function called while turning a cpu off or suspending it. It is called |
| 123 | * from css_off() or css_suspend() when these functions in turn are called for |
| 124 | * the highest affinity level which will be powered down. It performs the |
| 125 | * actions common to the OFF and SUSPEND calls. |
| 126 | ******************************************************************************/ |
| 127 | static void css_power_down_common(uint32_t afflvl) |
| 128 | { |
| 129 | uint32_t cluster_state = scpi_power_on; |
| 130 | |
| 131 | /* Prevent interrupts from spuriously waking up this cpu */ |
| 132 | arm_gic_cpuif_deactivate(); |
| 133 | |
| 134 | /* Cluster is to be turned off, so disable coherency */ |
| 135 | if (afflvl > MPIDR_AFFLVL0) { |
| 136 | cci_disable_snoop_dvm_reqs(MPIDR_AFFLVL1_VAL(read_mpidr())); |
| 137 | cluster_state = scpi_power_off; |
| 138 | } |
| 139 | |
| 140 | /* |
| 141 | * Ask the SCP to power down the appropriate components depending upon |
| 142 | * their state. |
| 143 | */ |
| 144 | scpi_set_css_power_state(read_mpidr_el1(), |
| 145 | scpi_power_off, |
| 146 | cluster_state, |
| 147 | scpi_power_on); |
| 148 | } |
| 149 | |
| 150 | /******************************************************************************* |
| 151 | * Handler called when an affinity instance is about to be turned off. The |
| 152 | * level and mpidr determine the affinity instance. The 'state' arg. allows the |
| 153 | * platform to decide whether the cluster is being turned off and take |
| 154 | * appropriate actions. |
| 155 | * |
| 156 | * CAUTION: There is no guarantee that caches will remain turned on across calls |
| 157 | * to this function as each affinity level is dealt with. So do not write & read |
| 158 | * global variables across calls. It will be wise to do flush a write to the |
| 159 | * global to prevent unpredictable results. |
| 160 | ******************************************************************************/ |
| 161 | static void css_affinst_off(uint32_t afflvl, uint32_t state) |
| 162 | { |
| 163 | /* Determine if any platform actions need to be executed */ |
| 164 | if (arm_do_affinst_actions(afflvl, state) == -EAGAIN) |
| 165 | return; |
| 166 | |
| 167 | css_power_down_common(afflvl); |
| 168 | } |
| 169 | |
| 170 | /******************************************************************************* |
| 171 | * Handler called when an affinity instance is about to be suspended. The |
| 172 | * level and mpidr determine the affinity instance. The 'state' arg. allows the |
| 173 | * platform to decide whether the cluster is being turned off and take apt |
| 174 | * actions. The 'sec_entrypoint' determines the address in BL3-1 from where |
| 175 | * execution should resume. |
| 176 | * |
| 177 | * CAUTION: There is no guarantee that caches will remain turned on across calls |
| 178 | * to this function as each affinity level is dealt with. So do not write & read |
| 179 | * global variables across calls. It will be wise to do flush a write to the |
| 180 | * global to prevent unpredictable results. |
| 181 | ******************************************************************************/ |
| 182 | static void css_affinst_suspend(uint64_t sec_entrypoint, |
| 183 | uint32_t afflvl, |
| 184 | uint32_t state) |
| 185 | { |
| 186 | /* Determine if any platform actions need to be executed */ |
| 187 | if (arm_do_affinst_actions(afflvl, state) == -EAGAIN) |
| 188 | return; |
| 189 | |
| 190 | /* |
| 191 | * Setup mailbox with address for CPU entrypoint when it next powers up. |
| 192 | */ |
| 193 | css_program_mailbox(read_mpidr_el1(), sec_entrypoint); |
| 194 | |
| 195 | css_power_down_common(afflvl); |
| 196 | } |
| 197 | |
| 198 | /******************************************************************************* |
| 199 | * Handler called when an affinity instance has just been powered on after |
| 200 | * having been suspended earlier. The level and mpidr determine the affinity |
| 201 | * instance. |
| 202 | * TODO: At the moment we reuse the on finisher and reinitialize the secure |
| 203 | * context. Need to implement a separate suspend finisher. |
| 204 | ******************************************************************************/ |
| 205 | static void css_affinst_suspend_finish(uint32_t afflvl, |
| 206 | uint32_t state) |
| 207 | { |
| 208 | css_affinst_on_finish(afflvl, state); |
| 209 | } |
| 210 | |
| 211 | /******************************************************************************* |
| 212 | * Handlers to shutdown/reboot the system |
| 213 | ******************************************************************************/ |
| 214 | static void __dead2 css_system_off(void) |
| 215 | { |
| 216 | uint32_t response; |
| 217 | |
| 218 | /* Send the power down request to the SCP */ |
| 219 | response = scpi_sys_power_state(scpi_system_shutdown); |
| 220 | |
| 221 | if (response != SCP_OK) { |
| 222 | ERROR("CSS System Off: SCP error %u.\n", response); |
| 223 | panic(); |
| 224 | } |
| 225 | wfi(); |
| 226 | ERROR("CSS System Off: operation not handled.\n"); |
| 227 | panic(); |
| 228 | } |
| 229 | |
| 230 | static void __dead2 css_system_reset(void) |
| 231 | { |
| 232 | uint32_t response; |
| 233 | |
| 234 | /* Send the system reset request to the SCP */ |
| 235 | response = scpi_sys_power_state(scpi_system_reboot); |
| 236 | |
| 237 | if (response != SCP_OK) { |
| 238 | ERROR("CSS System Reset: SCP error %u.\n", response); |
| 239 | panic(); |
| 240 | } |
| 241 | wfi(); |
| 242 | ERROR("CSS System Reset: operation not handled.\n"); |
| 243 | panic(); |
| 244 | } |
| 245 | |
| 246 | /******************************************************************************* |
| 247 | * Handler called when an affinity instance is about to enter standby. |
| 248 | ******************************************************************************/ |
| 249 | void css_affinst_standby(unsigned int power_state) |
| 250 | { |
| 251 | unsigned int scr; |
| 252 | |
| 253 | scr = read_scr_el3(); |
| 254 | /* Enable PhysicalIRQ bit for NS world to wake the CPU */ |
| 255 | write_scr_el3(scr | SCR_IRQ_BIT); |
| 256 | isb(); |
| 257 | dsb(); |
| 258 | wfi(); |
| 259 | |
| 260 | /* |
| 261 | * Restore SCR to the original value, synchronisation of scr_el3 is |
| 262 | * done by eret while el3_exit to save some execution cycles. |
| 263 | */ |
| 264 | write_scr_el3(scr); |
| 265 | } |
| 266 | |
| 267 | /******************************************************************************* |
| 268 | * Export the platform handlers to enable psci to invoke them |
| 269 | ******************************************************************************/ |
| 270 | static const plat_pm_ops_t css_ops = { |
| 271 | .affinst_on = css_affinst_on, |
| 272 | .affinst_on_finish = css_affinst_on_finish, |
| 273 | .affinst_off = css_affinst_off, |
| 274 | .affinst_standby = css_affinst_standby, |
| 275 | .affinst_suspend = css_affinst_suspend, |
| 276 | .affinst_suspend_finish = css_affinst_suspend_finish, |
| 277 | .system_off = css_system_off, |
| 278 | .system_reset = css_system_reset, |
| 279 | .validate_power_state = arm_validate_power_state |
| 280 | }; |
| 281 | |
| 282 | /******************************************************************************* |
| 283 | * Export the platform specific power ops. |
| 284 | ******************************************************************************/ |
| 285 | int32_t platform_setup_pm(const plat_pm_ops_t **plat_ops) |
| 286 | { |
| 287 | *plat_ops = &css_ops; |
| 288 | return 0; |
| 289 | } |