333 lines
7.5 KiB
C
333 lines
7.5 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Copyright (C) 2012 ARM Limited
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*
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* Author: Will Deacon <will.deacon@arm.com>
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*/
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#define pr_fmt(fmt) "psci: " fmt
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/reboot.h>
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#include <linux/pm.h>
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#include <uapi/linux/psci.h>
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#include <asm/compiler.h>
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#include <asm/errno.h>
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#include <asm/opcodes-sec.h>
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#include <asm/opcodes-virt.h>
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#include <asm/psci.h>
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#include <asm/system_misc.h>
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struct psci_operations psci_ops;
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static int (*invoke_psci_fn)(u32, u32, u32, u32);
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typedef int (*psci_initcall_t)(const struct device_node *);
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enum psci_function {
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PSCI_FN_CPU_SUSPEND,
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PSCI_FN_CPU_ON,
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PSCI_FN_CPU_OFF,
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PSCI_FN_MIGRATE,
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PSCI_FN_AFFINITY_INFO,
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PSCI_FN_MIGRATE_INFO_TYPE,
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PSCI_FN_MAX,
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};
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static u32 psci_function_id[PSCI_FN_MAX];
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static int psci_to_linux_errno(int errno)
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{
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switch (errno) {
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case PSCI_RET_SUCCESS:
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return 0;
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case PSCI_RET_NOT_SUPPORTED:
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return -EOPNOTSUPP;
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case PSCI_RET_INVALID_PARAMS:
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return -EINVAL;
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case PSCI_RET_DENIED:
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return -EPERM;
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};
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return -EINVAL;
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}
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static u32 psci_power_state_pack(struct psci_power_state state)
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{
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return ((state.id << PSCI_0_2_POWER_STATE_ID_SHIFT)
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& PSCI_0_2_POWER_STATE_ID_MASK) |
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((state.type << PSCI_0_2_POWER_STATE_TYPE_SHIFT)
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& PSCI_0_2_POWER_STATE_TYPE_MASK) |
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((state.affinity_level << PSCI_0_2_POWER_STATE_AFFL_SHIFT)
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& PSCI_0_2_POWER_STATE_AFFL_MASK);
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}
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/*
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* The following two functions are invoked via the invoke_psci_fn pointer
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* and will not be inlined, allowing us to piggyback on the AAPCS.
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*/
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static noinline int __invoke_psci_fn_hvc(u32 function_id, u32 arg0, u32 arg1,
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u32 arg2)
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{
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asm volatile(
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__asmeq("%0", "r0")
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__asmeq("%1", "r1")
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__asmeq("%2", "r2")
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__asmeq("%3", "r3")
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__HVC(0)
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: "+r" (function_id)
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: "r" (arg0), "r" (arg1), "r" (arg2));
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return function_id;
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}
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static noinline int __invoke_psci_fn_smc(u32 function_id, u32 arg0, u32 arg1,
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u32 arg2)
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{
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asm volatile(
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__asmeq("%0", "r0")
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__asmeq("%1", "r1")
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__asmeq("%2", "r2")
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__asmeq("%3", "r3")
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__SMC(0)
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: "+r" (function_id)
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: "r" (arg0), "r" (arg1), "r" (arg2));
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return function_id;
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}
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static int psci_get_version(void)
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{
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int err;
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err = invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
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return err;
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}
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static int psci_cpu_suspend(struct psci_power_state state,
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unsigned long entry_point)
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{
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int err;
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u32 fn, power_state;
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fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
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power_state = psci_power_state_pack(state);
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err = invoke_psci_fn(fn, power_state, entry_point, 0);
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return psci_to_linux_errno(err);
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}
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static int psci_cpu_off(struct psci_power_state state)
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{
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int err;
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u32 fn, power_state;
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fn = psci_function_id[PSCI_FN_CPU_OFF];
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power_state = psci_power_state_pack(state);
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err = invoke_psci_fn(fn, power_state, 0, 0);
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return psci_to_linux_errno(err);
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}
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static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point)
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{
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int err;
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u32 fn;
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fn = psci_function_id[PSCI_FN_CPU_ON];
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err = invoke_psci_fn(fn, cpuid, entry_point, 0);
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return psci_to_linux_errno(err);
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}
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static int psci_migrate(unsigned long cpuid)
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{
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int err;
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u32 fn;
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fn = psci_function_id[PSCI_FN_MIGRATE];
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err = invoke_psci_fn(fn, cpuid, 0, 0);
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return psci_to_linux_errno(err);
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}
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static int psci_affinity_info(unsigned long target_affinity,
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unsigned long lowest_affinity_level)
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{
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int err;
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u32 fn;
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fn = psci_function_id[PSCI_FN_AFFINITY_INFO];
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err = invoke_psci_fn(fn, target_affinity, lowest_affinity_level, 0);
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return err;
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}
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static int psci_migrate_info_type(void)
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{
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int err;
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u32 fn;
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fn = psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE];
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err = invoke_psci_fn(fn, 0, 0, 0);
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return err;
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}
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static int get_set_conduit_method(struct device_node *np)
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{
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const char *method;
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pr_info("probing for conduit method from DT.\n");
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if (of_property_read_string(np, "method", &method)) {
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pr_warn("missing \"method\" property\n");
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return -ENXIO;
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}
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if (!strcmp("hvc", method)) {
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invoke_psci_fn = __invoke_psci_fn_hvc;
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} else if (!strcmp("smc", method)) {
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invoke_psci_fn = __invoke_psci_fn_smc;
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} else {
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pr_warn("invalid \"method\" property: %s\n", method);
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return -EINVAL;
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}
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return 0;
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}
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static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
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{
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invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
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}
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static void psci_sys_poweroff(void)
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{
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invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
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}
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/*
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* PSCI Function IDs for v0.2+ are well defined so use
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* standard values.
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*/
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static int psci_0_2_init(struct device_node *np)
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{
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int err, ver;
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err = get_set_conduit_method(np);
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if (err)
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goto out_put_node;
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ver = psci_get_version();
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if (ver == PSCI_RET_NOT_SUPPORTED) {
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/* PSCI v0.2 mandates implementation of PSCI_ID_VERSION. */
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pr_err("PSCI firmware does not comply with the v0.2 spec.\n");
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err = -EOPNOTSUPP;
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goto out_put_node;
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} else {
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pr_info("PSCIv%d.%d detected in firmware.\n",
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PSCI_VERSION_MAJOR(ver),
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PSCI_VERSION_MINOR(ver));
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if (PSCI_VERSION_MAJOR(ver) == 0 &&
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PSCI_VERSION_MINOR(ver) < 2) {
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err = -EINVAL;
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pr_err("Conflicting PSCI version detected.\n");
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goto out_put_node;
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}
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}
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pr_info("Using standard PSCI v0.2 function IDs\n");
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psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_0_2_FN_CPU_SUSPEND;
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psci_ops.cpu_suspend = psci_cpu_suspend;
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psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF;
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psci_ops.cpu_off = psci_cpu_off;
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psci_function_id[PSCI_FN_CPU_ON] = PSCI_0_2_FN_CPU_ON;
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psci_ops.cpu_on = psci_cpu_on;
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psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN_MIGRATE;
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psci_ops.migrate = psci_migrate;
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psci_function_id[PSCI_FN_AFFINITY_INFO] = PSCI_0_2_FN_AFFINITY_INFO;
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psci_ops.affinity_info = psci_affinity_info;
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psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE] =
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PSCI_0_2_FN_MIGRATE_INFO_TYPE;
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psci_ops.migrate_info_type = psci_migrate_info_type;
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arm_pm_restart = psci_sys_reset;
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pm_power_off = psci_sys_poweroff;
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out_put_node:
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of_node_put(np);
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return err;
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}
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/*
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* PSCI < v0.2 get PSCI Function IDs via DT.
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*/
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static int psci_0_1_init(struct device_node *np)
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{
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u32 id;
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int err;
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err = get_set_conduit_method(np);
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if (err)
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goto out_put_node;
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pr_info("Using PSCI v0.1 Function IDs from DT\n");
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if (!of_property_read_u32(np, "cpu_suspend", &id)) {
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psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
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psci_ops.cpu_suspend = psci_cpu_suspend;
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}
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if (!of_property_read_u32(np, "cpu_off", &id)) {
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psci_function_id[PSCI_FN_CPU_OFF] = id;
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psci_ops.cpu_off = psci_cpu_off;
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}
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if (!of_property_read_u32(np, "cpu_on", &id)) {
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psci_function_id[PSCI_FN_CPU_ON] = id;
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psci_ops.cpu_on = psci_cpu_on;
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}
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if (!of_property_read_u32(np, "migrate", &id)) {
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psci_function_id[PSCI_FN_MIGRATE] = id;
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psci_ops.migrate = psci_migrate;
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}
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out_put_node:
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of_node_put(np);
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return err;
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}
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static const struct of_device_id psci_of_match[] __initconst = {
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{ .compatible = "arm,psci", .data = psci_0_1_init},
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{ .compatible = "arm,psci-0.2", .data = psci_0_2_init},
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{},
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};
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int __init psci_init(void)
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{
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struct device_node *np;
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const struct of_device_id *matched_np;
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psci_initcall_t init_fn;
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np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
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if (!np)
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return -ENODEV;
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init_fn = (psci_initcall_t)matched_np->data;
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return init_fn(np);
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}
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