| /* |
| * Copyright (c) 2013, ARM Limited and Contributors. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * Redistributions of source code must retain the above copyright notice, this |
| * list of conditions and the following disclaimer. |
| * |
| * Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * Neither the name of ARM nor the names of its contributors may be used |
| * to endorse or promote products derived from this software without specific |
| * prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <assert.h> |
| #include <arch_helpers.h> |
| #include <arm_gic.h> |
| #include <debug.h> |
| #include <cci400.h> |
| #include <errno.h> |
| #include <platform.h> |
| #include <platform_def.h> |
| #include <psci.h> |
| #include "juno_def.h" |
| #include "juno_private.h" |
| #include "scpi.h" |
| |
| /******************************************************************************* |
| * Private Juno function to program the mailbox for a cpu before it is released |
| * from reset. |
| ******************************************************************************/ |
| static void juno_program_mailbox(uint64_t mpidr, uint64_t address) |
| { |
| uint64_t linear_id; |
| uint64_t mbox; |
| |
| linear_id = platform_get_core_pos(mpidr); |
| mbox = TRUSTED_MAILBOXES_BASE + (linear_id << TRUSTED_MAILBOX_SHIFT); |
| *((uint64_t *) mbox) = address; |
| flush_dcache_range(mbox, sizeof(mbox)); |
| } |
| |
| /******************************************************************************* |
| * Private Juno function which is used to determine if any platform actions |
| * should be performed for the specified affinity instance given its |
| * state. Nothing needs to be done if the 'state' is not off or if this is not |
| * the highest affinity level which will enter the 'state'. |
| ******************************************************************************/ |
| static int32_t juno_do_plat_actions(uint32_t afflvl, uint32_t state) |
| { |
| uint32_t max_phys_off_afflvl; |
| |
| assert(afflvl <= MPIDR_AFFLVL1); |
| |
| if (state != PSCI_STATE_OFF) |
| return -EAGAIN; |
| |
| /* |
| * Find the highest affinity level which will be suspended and postpone |
| * all the platform specific actions until that level is hit. |
| */ |
| max_phys_off_afflvl = psci_get_max_phys_off_afflvl(); |
| assert(max_phys_off_afflvl != PSCI_INVALID_DATA); |
| assert(psci_get_suspend_afflvl() >= max_phys_off_afflvl); |
| if (afflvl != max_phys_off_afflvl) |
| return -EAGAIN; |
| |
| return 0; |
| } |
| |
| /******************************************************************************* |
| * Juno handler called when an affinity instance is about to be turned on. The |
| * level and mpidr determine the affinity instance. |
| ******************************************************************************/ |
| int32_t juno_affinst_on(uint64_t mpidr, |
| uint64_t sec_entrypoint, |
| uint64_t ns_entrypoint, |
| uint32_t afflvl, |
| uint32_t state) |
| { |
| /* |
| * SCP takes care of powering up higher affinity levels so we |
| * only need to care about level 0 |
| */ |
| if (afflvl != MPIDR_AFFLVL0) |
| return PSCI_E_SUCCESS; |
| |
| /* |
| * Setup mailbox with address for CPU entrypoint when it next powers up |
| */ |
| juno_program_mailbox(mpidr, sec_entrypoint); |
| |
| scpi_set_css_power_state(mpidr, scpi_power_on, scpi_power_on, |
| scpi_power_on); |
| |
| return PSCI_E_SUCCESS; |
| } |
| |
| /******************************************************************************* |
| * Juno handler called when an affinity instance has just been powered on after |
| * being turned off earlier. The level and mpidr determine the affinity |
| * instance. The 'state' arg. allows the platform to decide whether the cluster |
| * was turned off prior to wakeup and do what's necessary to setup it up |
| * correctly. |
| ******************************************************************************/ |
| int32_t juno_affinst_on_finish(uint64_t mpidr, uint32_t afflvl, uint32_t state) |
| { |
| /* Determine if any platform actions need to be executed. */ |
| if (juno_do_plat_actions(afflvl, state) == -EAGAIN) |
| return PSCI_E_SUCCESS; |
| |
| /* |
| * Perform the common cluster specific operations i.e enable coherency |
| * if this cluster was off. |
| */ |
| if (afflvl != MPIDR_AFFLVL0) |
| cci_enable_cluster_coherency(mpidr); |
| |
| |
| /* Enable the gic cpu interface */ |
| arm_gic_cpuif_setup(); |
| |
| /* Juno todo: Is this setup only needed after a cold boot? */ |
| arm_gic_pcpu_distif_setup(); |
| |
| /* Clear the mailbox for this cpu. */ |
| juno_program_mailbox(mpidr, 0); |
| |
| return PSCI_E_SUCCESS; |
| } |
| |
| /******************************************************************************* |
| * Common function called while turning a cpu off or suspending it. It is called |
| * from juno_off() or juno_suspend() when these functions in turn are called for |
| * the highest affinity level which will be powered down. It performs the |
| * actions common to the OFF and SUSPEND calls. |
| ******************************************************************************/ |
| static int32_t juno_power_down_common(uint32_t afflvl) |
| { |
| uint32_t cluster_state = scpi_power_on; |
| |
| /* Prevent interrupts from spuriously waking up this cpu */ |
| arm_gic_cpuif_deactivate(); |
| |
| /* Cluster is to be turned off, so disable coherency */ |
| if (afflvl > MPIDR_AFFLVL0) { |
| cci_disable_cluster_coherency(read_mpidr_el1()); |
| cluster_state = scpi_power_off; |
| } |
| |
| /* |
| * Ask the SCP to power down the appropriate components depending upon |
| * their state. |
| */ |
| scpi_set_css_power_state(read_mpidr_el1(), |
| scpi_power_off, |
| cluster_state, |
| scpi_power_on); |
| |
| return PSCI_E_SUCCESS; |
| } |
| |
| /******************************************************************************* |
| * Handler called when an affinity instance is about to be turned off. The |
| * level and mpidr determine the affinity instance. The 'state' arg. allows the |
| * platform to decide whether the cluster is being turned off and take |
| * appropriate actions. |
| * |
| * CAUTION: There is no guarantee that caches will remain turned on across calls |
| * to this function as each affinity level is dealt with. So do not write & read |
| * global variables across calls. It will be wise to do flush a write to the |
| * global to prevent unpredictable results. |
| ******************************************************************************/ |
| static int32_t juno_affinst_off(uint64_t mpidr, uint32_t afflvl, uint32_t state) |
| { |
| /* Determine if any platform actions need to be executed */ |
| if (juno_do_plat_actions(afflvl, state) == -EAGAIN) |
| return PSCI_E_SUCCESS; |
| |
| return juno_power_down_common(afflvl); |
| } |
| |
| /******************************************************************************* |
| * Handler called when an affinity instance is about to be suspended. The |
| * level and mpidr determine the affinity instance. The 'state' arg. allows the |
| * platform to decide whether the cluster is being turned off and take apt |
| * actions. The 'sec_entrypoint' determines the address in BL3-1 from where |
| * execution should resume. |
| * |
| * CAUTION: There is no guarantee that caches will remain turned on across calls |
| * to this function as each affinity level is dealt with. So do not write & read |
| * global variables across calls. It will be wise to do flush a write to the |
| * global to prevent unpredictable results. |
| ******************************************************************************/ |
| static int32_t juno_affinst_suspend(uint64_t mpidr, |
| uint64_t sec_entrypoint, |
| uint64_t ns_entrypoint, |
| uint32_t afflvl, |
| uint32_t state) |
| { |
| /* Determine if any platform actions need to be executed */ |
| if (juno_do_plat_actions(afflvl, state) == -EAGAIN) |
| return PSCI_E_SUCCESS; |
| |
| /* |
| * Setup mailbox with address for CPU entrypoint when it next powers up. |
| */ |
| juno_program_mailbox(mpidr, sec_entrypoint); |
| |
| return juno_power_down_common(afflvl); |
| } |
| |
| /******************************************************************************* |
| * Juno handler called when an affinity instance has just been powered on after |
| * having been suspended earlier. The level and mpidr determine the affinity |
| * instance. |
| * TODO: At the moment we reuse the on finisher and reinitialize the secure |
| * context. Need to implement a separate suspend finisher. |
| ******************************************************************************/ |
| static int32_t juno_affinst_suspend_finish(uint64_t mpidr, |
| uint32_t afflvl, |
| uint32_t state) |
| { |
| return juno_affinst_on_finish(mpidr, afflvl, state); |
| } |
| |
| /******************************************************************************* |
| * Juno handlers to shutdown/reboot the system |
| ******************************************************************************/ |
| static void __dead2 juno_system_off(void) |
| { |
| uint32_t response; |
| |
| /* Send the power down request to the SCP */ |
| response = scpi_sys_power_state(scpi_system_shutdown); |
| |
| if (response != SCP_OK) { |
| ERROR("Juno System Off: SCP error %u.\n", response); |
| panic(); |
| } |
| wfi(); |
| ERROR("Juno System Off: operation not handled.\n"); |
| panic(); |
| } |
| |
| static void __dead2 juno_system_reset(void) |
| { |
| uint32_t response; |
| |
| /* Send the system reset request to the SCP */ |
| response = scpi_sys_power_state(scpi_system_reboot); |
| |
| if (response != SCP_OK) { |
| ERROR("Juno System Reset: SCP error %u.\n", response); |
| panic(); |
| } |
| wfi(); |
| ERROR("Juno System Reset: operation not handled.\n"); |
| panic(); |
| } |
| |
| /******************************************************************************* |
| * Export the platform handlers to enable psci to invoke them |
| ******************************************************************************/ |
| static const plat_pm_ops_t juno_ops = { |
| .affinst_on = juno_affinst_on, |
| .affinst_on_finish = juno_affinst_on_finish, |
| .affinst_off = juno_affinst_off, |
| .affinst_suspend = juno_affinst_suspend, |
| .affinst_suspend_finish = juno_affinst_suspend_finish, |
| .system_off = juno_system_off, |
| .system_reset = juno_system_reset |
| }; |
| |
| /******************************************************************************* |
| * Export the platform specific power ops. |
| ******************************************************************************/ |
| int32_t platform_setup_pm(const plat_pm_ops_t **plat_ops) |
| { |
| *plat_ops = &juno_ops; |
| return 0; |
| } |