/* * Copyright (c) 2013-2014, 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 #include #include #include #include #include #include #include #include #include #include "drivers/pwrc/fvp_pwrc.h" #include "fvp_def.h" #include "fvp_private.h" /******************************************************************************* * FVP handler called when an affinity instance is about to enter standby. ******************************************************************************/ int fvp_affinst_standby(unsigned int power_state) { unsigned int target_afflvl; /* Sanity check the requested state */ target_afflvl = psci_get_pstate_afflvl(power_state); /* * It's possible to enter standby only on affinity level 0 i.e. a cpu * on the FVP. Ignore any other affinity level. */ if (target_afflvl != MPIDR_AFFLVL0) return PSCI_E_INVALID_PARAMS; /* * Enter standby state * dsb is good practice before using wfi to enter low power states */ dsb(); wfi(); return PSCI_E_SUCCESS; } /******************************************************************************* * FVP handler called when an affinity instance is about to be turned on. The * level and mpidr determine the affinity instance. ******************************************************************************/ int fvp_affinst_on(unsigned long mpidr, unsigned long sec_entrypoint, unsigned long ns_entrypoint, unsigned int afflvl, unsigned int state) { int rc = PSCI_E_SUCCESS; unsigned long linear_id; mailbox_t *fvp_mboxes; unsigned int psysr; /* * It's possible to turn on only affinity level 0 i.e. a cpu * on the FVP. Ignore any other affinity level. */ if (afflvl != MPIDR_AFFLVL0) goto exit; /* * Ensure that we do not cancel an inflight power off request * for the target cpu. That would leave it in a zombie wfi. * Wait for it to power off, program the jump address for the * target cpu and then program the power controller to turn * that cpu on */ do { psysr = fvp_pwrc_read_psysr(mpidr); } while (psysr & PSYSR_AFF_L0); linear_id = platform_get_core_pos(mpidr); fvp_mboxes = (mailbox_t *)MBOX_BASE; fvp_mboxes[linear_id].value = sec_entrypoint; flush_dcache_range((unsigned long) &fvp_mboxes[linear_id], sizeof(unsigned long)); fvp_pwrc_write_pponr(mpidr); exit: return rc; } /******************************************************************************* * FVP 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 apt * 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. ******************************************************************************/ int fvp_affinst_off(unsigned long mpidr, unsigned int afflvl, unsigned int state) { int rc = PSCI_E_SUCCESS; unsigned int ectlr; switch (afflvl) { case MPIDR_AFFLVL1: if (state == PSCI_STATE_OFF) { /* * Disable coherency if this cluster is to be * turned off */ if (get_plat_config()->flags & CONFIG_HAS_CCI) cci_disable_coherency(mpidr); /* * Program the power controller to turn the * cluster off */ fvp_pwrc_write_pcoffr(mpidr); } break; case MPIDR_AFFLVL0: if (state == PSCI_STATE_OFF) { /* * Take this cpu out of intra-cluster coherency if * the FVP flavour supports the SMP bit. */ if (get_plat_config()->flags & CONFIG_CPUECTLR_SMP_BIT) { ectlr = read_cpuectlr(); ectlr &= ~CPUECTLR_SMP_BIT; write_cpuectlr(ectlr); } /* * Prevent interrupts from spuriously waking up * this cpu */ arm_gic_cpuif_deactivate(); /* * Program the power controller to power this * cpu off */ fvp_pwrc_write_ppoffr(mpidr); } break; default: assert(0); } return rc; } /******************************************************************************* * FVP 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. * * 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. ******************************************************************************/ int fvp_affinst_suspend(unsigned long mpidr, unsigned long sec_entrypoint, unsigned long ns_entrypoint, unsigned int afflvl, unsigned int state) { int rc = PSCI_E_SUCCESS; unsigned int ectlr; unsigned long linear_id; mailbox_t *fvp_mboxes; switch (afflvl) { case MPIDR_AFFLVL1: if (state == PSCI_STATE_OFF) { /* * Disable coherency if this cluster is to be * turned off */ if (get_plat_config()->flags & CONFIG_HAS_CCI) cci_disable_coherency(mpidr); /* * Program the power controller to turn the * cluster off */ fvp_pwrc_write_pcoffr(mpidr); } break; case MPIDR_AFFLVL0: if (state == PSCI_STATE_OFF) { /* * Take this cpu out of intra-cluster coherency if * the FVP flavour supports the SMP bit. */ if (get_plat_config()->flags & CONFIG_CPUECTLR_SMP_BIT) { ectlr = read_cpuectlr(); ectlr &= ~CPUECTLR_SMP_BIT; write_cpuectlr(ectlr); } /* Program the jump address for the target cpu */ linear_id = platform_get_core_pos(mpidr); fvp_mboxes = (mailbox_t *)MBOX_BASE; fvp_mboxes[linear_id].value = sec_entrypoint; flush_dcache_range((unsigned long) &fvp_mboxes[linear_id], sizeof(unsigned long)); /* * Prevent interrupts from spuriously waking up * this cpu */ arm_gic_cpuif_deactivate(); /* * Program the power controller to power this * cpu off and enable wakeup interrupts. */ fvp_pwrc_set_wen(mpidr); fvp_pwrc_write_ppoffr(mpidr); } break; default: assert(0); } return rc; } /******************************************************************************* * FVP 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. ******************************************************************************/ int fvp_affinst_on_finish(unsigned long mpidr, unsigned int afflvl, unsigned int state) { int rc = PSCI_E_SUCCESS; unsigned long linear_id; mailbox_t *fvp_mboxes; unsigned int ectlr; switch (afflvl) { case MPIDR_AFFLVL1: /* Enable coherency if this cluster was off */ if (state == PSCI_STATE_OFF) { /* * This CPU might have woken up whilst the * cluster was attempting to power down. In * this case the FVP power controller will * have a pending cluster power off request * which needs to be cleared by writing to the * PPONR register. This prevents the power * controller from interpreting a subsequent * entry of this cpu into a simple wfi as a * power down request. */ fvp_pwrc_write_pponr(mpidr); fvp_cci_setup(); } break; case MPIDR_AFFLVL0: /* * Ignore the state passed for a cpu. It could only have * been off if we are here. */ /* * Turn on intra-cluster coherency if the FVP flavour supports * it. */ if (get_plat_config()->flags & CONFIG_CPUECTLR_SMP_BIT) { ectlr = read_cpuectlr(); ectlr |= CPUECTLR_SMP_BIT; write_cpuectlr(ectlr); } /* * Clear PWKUPR.WEN bit to ensure interrupts do not interfere * with a cpu power down unless the bit is set again */ fvp_pwrc_clr_wen(mpidr); /* Zero the jump address in the mailbox for this cpu */ fvp_mboxes = (mailbox_t *)MBOX_BASE; linear_id = platform_get_core_pos(mpidr); fvp_mboxes[linear_id].value = 0; flush_dcache_range((unsigned long) &fvp_mboxes[linear_id], sizeof(unsigned long)); /* Enable the gic cpu interface */ arm_gic_cpuif_setup(); /* TODO: This setup is needed only after a cold boot */ arm_gic_pcpu_distif_setup(); break; default: assert(0); } return rc; } /******************************************************************************* * FVP 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. ******************************************************************************/ int fvp_affinst_suspend_finish(unsigned long mpidr, unsigned int afflvl, unsigned int state) { return fvp_affinst_on_finish(mpidr, afflvl, state); } /******************************************************************************* * Export the platform handlers to enable psci to invoke them ******************************************************************************/ static const plat_pm_ops_t fvp_plat_pm_ops = { fvp_affinst_standby, fvp_affinst_on, fvp_affinst_off, fvp_affinst_suspend, fvp_affinst_on_finish, fvp_affinst_suspend_finish, }; /******************************************************************************* * Export the platform specific power ops & initialize the fvp power controller ******************************************************************************/ int platform_setup_pm(const plat_pm_ops_t **plat_ops) { *plat_ops = &fvp_plat_pm_ops; return 0; }