/* * Copyright (c) 2013-2015, 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. */ /* * APU specific definition of processors in the subsystem as well as functions * for getting information about and changing state of the APU. */ #include #include #include #include #include "pm_api_sys.h" #include "pm_client.h" #include "pm_ipi.h" #include "../zynqmp_def.h" #define OCM_BANK_0 0xFFFC0000 #define OCM_BANK_1 (OCM_BANK_0 + 0x10000) #define OCM_BANK_2 (OCM_BANK_1 + 0x10000) #define OCM_BANK_3 (OCM_BANK_2 + 0x10000) #define UNDEFINED_CPUID (~0) DEFINE_BAKERY_LOCK(pm_client_secure_lock); /* Declaration of linker defined symbol */ extern unsigned long __BL31_END__; extern const struct pm_ipi apu_ipi; /* Order in pm_procs_all array must match cpu ids */ static const struct pm_proc const pm_procs_all[] = { { .node_id = NODE_APU_0, .pwrdn_mask = APU_0_PWRCTL_CPUPWRDWNREQ_MASK, .ipi = &apu_ipi, }, { .node_id = NODE_APU_1, .pwrdn_mask = APU_1_PWRCTL_CPUPWRDWNREQ_MASK, .ipi = &apu_ipi, }, { .node_id = NODE_APU_2, .pwrdn_mask = APU_2_PWRCTL_CPUPWRDWNREQ_MASK, .ipi = &apu_ipi, }, { .node_id = NODE_APU_3, .pwrdn_mask = APU_3_PWRCTL_CPUPWRDWNREQ_MASK, .ipi = &apu_ipi, }, }; /** * set_ocm_retention() - Configure OCM memory banks for retention * * APU specific requirements for suspend action: * OCM has to enter retention state in order to preserve saved * context after suspend request. OCM banks are determined by * __BL31_END__ linker symbol. * * Return: Returns status, either success or error+reason */ enum pm_ret_status set_ocm_retention(void) { enum pm_ret_status ret; /* OCM_BANK_0 will always be occupied */ ret = pm_set_requirement(NODE_OCM_BANK_0, PM_CAP_CONTEXT, 0, REQ_ACK_NO); /* Check for other OCM banks */ if ((unsigned long)&__BL31_END__ >= OCM_BANK_1) ret = pm_set_requirement(NODE_OCM_BANK_1, PM_CAP_CONTEXT, 0, REQ_ACK_NO); if ((unsigned long)&__BL31_END__ >= OCM_BANK_2) ret = pm_set_requirement(NODE_OCM_BANK_2, PM_CAP_CONTEXT, 0, REQ_ACK_NO); if ((unsigned long)&__BL31_END__ >= OCM_BANK_3) ret = pm_set_requirement(NODE_OCM_BANK_3, PM_CAP_CONTEXT, 0, REQ_ACK_NO); return ret; } /** * pm_get_proc() - returns pointer to the proc structure * @cpuid: id of the cpu whose proc struct pointer should be returned * * Return: pointer to a proc structure if proc is found, otherwise NULL */ const struct pm_proc *pm_get_proc(unsigned int cpuid) { if (cpuid < ARRAY_SIZE(pm_procs_all)) return &pm_procs_all[cpuid]; return NULL; } /** * pm_get_proc_by_node() - returns pointer to the proc structure * @nid: node id of the processor * * Return: pointer to a proc structure if proc is found, otherwise NULL */ const struct pm_proc *pm_get_proc_by_node(enum pm_node_id nid) { for (size_t i = 0; i < ARRAY_SIZE(pm_procs_all); i++) { if (nid == pm_procs_all[i].node_id) return &pm_procs_all[i]; } return NULL; } /** * pm_get_cpuid() - get the local cpu ID for a global node ID * @nid: node id of the processor * * Return: the cpu ID (starting from 0) for the subsystem */ static unsigned int pm_get_cpuid(enum pm_node_id nid) { for (size_t i = 0; i < ARRAY_SIZE(pm_procs_all); i++) { if (pm_procs_all[i].node_id == nid) return i; } return UNDEFINED_CPUID; } const struct pm_proc *primary_proc = &pm_procs_all[0]; /** * pm_client_suspend() - Client-specific suspend actions * * This function should contain any PU-specific actions * required prior to sending suspend request to PMU */ void pm_client_suspend(const struct pm_proc *proc) { bakery_lock_get(&pm_client_secure_lock); /* Set powerdown request */ mmio_write_32(APU_PWRCTL, mmio_read_32(APU_PWRCTL) | proc->pwrdn_mask); bakery_lock_release(&pm_client_secure_lock); } /** * pm_client_abort_suspend() - Client-specific abort-suspend actions * * This function should contain any PU-specific actions * required for aborting a prior suspend request */ void pm_client_abort_suspend(void) { /* Enable interrupts at processor level (for current cpu) */ gicv2_cpuif_enable(); bakery_lock_get(&pm_client_secure_lock); /* Clear powerdown request */ mmio_write_32(APU_PWRCTL, mmio_read_32(APU_PWRCTL) & ~primary_proc->pwrdn_mask); bakery_lock_release(&pm_client_secure_lock); } /** * pm_client_wakeup() - Client-specific wakeup actions * * This function should contain any PU-specific actions * required for waking up another APU core */ void pm_client_wakeup(const struct pm_proc *proc) { unsigned int cpuid = pm_get_cpuid(proc->node_id); if (cpuid == UNDEFINED_CPUID) return; bakery_lock_get(&pm_client_secure_lock); /* clear powerdown bit for affected cpu */ uint32_t val = mmio_read_32(APU_PWRCTL); val &= ~(proc->pwrdn_mask); mmio_write_32(APU_PWRCTL, val); bakery_lock_release(&pm_client_secure_lock); }