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PSCI: Add initial support for PSCIv0.2 functions
The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Ashwin Chaugule
parent
4447a208f7
commit
e71246a23a
@ -29,16 +29,19 @@ struct psci_operations {
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int (*cpu_off)(struct psci_power_state state);
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int (*cpu_on)(unsigned long cpuid, unsigned long entry_point);
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int (*migrate)(unsigned long cpuid);
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int (*affinity_info)(unsigned long target_affinity,
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unsigned long lowest_affinity_level);
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int (*migrate_info_type)(void);
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};
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extern struct psci_operations psci_ops;
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extern struct smp_operations psci_smp_ops;
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#ifdef CONFIG_ARM_PSCI
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void psci_init(void);
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int psci_init(void);
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bool psci_smp_available(void);
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#else
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static inline void psci_init(void) { }
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static inline int psci_init(void) { }
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static inline bool psci_smp_available(void) { return false; }
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#endif
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@ -17,63 +17,58 @@
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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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#define PSCI_RET_SUCCESS 0
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#define PSCI_RET_EOPNOTSUPP -1
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#define PSCI_RET_EINVAL -2
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#define PSCI_RET_EPERM -3
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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_EOPNOTSUPP:
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case PSCI_RET_NOT_SUPPORTED:
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return -EOPNOTSUPP;
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case PSCI_RET_EINVAL:
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case PSCI_RET_INVALID_PARAMS:
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return -EINVAL;
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case PSCI_RET_EPERM:
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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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#define PSCI_POWER_STATE_ID_MASK 0xffff
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#define PSCI_POWER_STATE_ID_SHIFT 0
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#define PSCI_POWER_STATE_TYPE_MASK 0x1
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#define PSCI_POWER_STATE_TYPE_SHIFT 16
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#define PSCI_POWER_STATE_AFFL_MASK 0x3
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#define PSCI_POWER_STATE_AFFL_SHIFT 24
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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_POWER_STATE_ID_MASK)
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<< PSCI_POWER_STATE_ID_SHIFT) |
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((state.type & PSCI_POWER_STATE_TYPE_MASK)
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<< PSCI_POWER_STATE_TYPE_SHIFT) |
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((state.affinity_level & PSCI_POWER_STATE_AFFL_MASK)
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<< PSCI_POWER_STATE_AFFL_SHIFT);
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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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@ -110,6 +105,14 @@ static noinline int __invoke_psci_fn_smc(u32 function_id, u32 arg0, u32 arg1,
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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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@ -153,26 +156,36 @@ static int psci_migrate(unsigned long cpuid)
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return psci_to_linux_errno(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", },
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{},
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};
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void __init psci_init(void)
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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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struct device_node *np;
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const char *method;
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u32 id;
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np = of_find_matching_node(NULL, psci_of_match);
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if (!np)
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return;
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pr_info("probing function IDs from device-tree\n");
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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_warning("missing \"method\" property\n");
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goto out_put_node;
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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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@ -180,9 +193,98 @@ void __init psci_init(void)
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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_warning("invalid \"method\" property: %s\n", method);
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goto out_put_node;
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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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@ -206,5 +308,25 @@ void __init psci_init(void)
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out_put_node:
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of_node_put(np);
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return;
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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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@ -14,6 +14,6 @@
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#ifndef __ASM_PSCI_H
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#define __ASM_PSCI_H
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void psci_init(void);
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int psci_init(void);
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#endif /* __ASM_PSCI_H */
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@ -18,12 +18,16 @@
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/smp.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/cpu_ops.h>
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#include <asm/errno.h>
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#include <asm/psci.h>
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#include <asm/smp_plat.h>
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#include <asm/system_misc.h>
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#define PSCI_POWER_STATE_TYPE_STANDBY 0
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#define PSCI_POWER_STATE_TYPE_POWER_DOWN 1
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@ -40,58 +44,52 @@ struct psci_operations {
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int (*cpu_off)(struct psci_power_state state);
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int (*cpu_on)(unsigned long cpuid, unsigned long entry_point);
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int (*migrate)(unsigned long cpuid);
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int (*affinity_info)(unsigned long target_affinity,
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unsigned long lowest_affinity_level);
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int (*migrate_info_type)(void);
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};
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static struct psci_operations psci_ops;
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static int (*invoke_psci_fn)(u64, u64, u64, u64);
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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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#define PSCI_RET_SUCCESS 0
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#define PSCI_RET_EOPNOTSUPP -1
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#define PSCI_RET_EINVAL -2
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#define PSCI_RET_EPERM -3
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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_EOPNOTSUPP:
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case PSCI_RET_NOT_SUPPORTED:
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return -EOPNOTSUPP;
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case PSCI_RET_EINVAL:
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case PSCI_RET_INVALID_PARAMS:
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return -EINVAL;
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case PSCI_RET_EPERM:
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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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#define PSCI_POWER_STATE_ID_MASK 0xffff
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#define PSCI_POWER_STATE_ID_SHIFT 0
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#define PSCI_POWER_STATE_TYPE_MASK 0x1
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#define PSCI_POWER_STATE_TYPE_SHIFT 16
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#define PSCI_POWER_STATE_AFFL_MASK 0x3
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#define PSCI_POWER_STATE_AFFL_SHIFT 24
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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_POWER_STATE_ID_MASK)
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<< PSCI_POWER_STATE_ID_SHIFT) |
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((state.type & PSCI_POWER_STATE_TYPE_MASK)
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<< PSCI_POWER_STATE_TYPE_SHIFT) |
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((state.affinity_level & PSCI_POWER_STATE_AFFL_MASK)
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<< PSCI_POWER_STATE_AFFL_SHIFT);
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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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@ -128,6 +126,14 @@ static noinline int __invoke_psci_fn_smc(u64 function_id, u64 arg0, u64 arg1,
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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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@ -171,26 +177,36 @@ static int psci_migrate(unsigned long cpuid)
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return psci_to_linux_errno(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", },
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{},
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};
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void __init psci_init(void)
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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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struct device_node *np;
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const char *method;
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u32 id;
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np = of_find_matching_node(NULL, psci_of_match);
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if (!np)
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return;
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|
||||
pr_info("probing function IDs from device-tree\n");
|
||||
pr_info("probing for conduit method from DT.\n");
|
||||
|
||||
if (of_property_read_string(np, "method", &method)) {
|
||||
pr_warning("missing \"method\" property\n");
|
||||
goto out_put_node;
|
||||
pr_warn("missing \"method\" property\n");
|
||||
return -ENXIO;
|
||||
}
|
||||
|
||||
if (!strcmp("hvc", method)) {
|
||||
@ -198,9 +214,98 @@ void __init psci_init(void)
|
||||
} else if (!strcmp("smc", method)) {
|
||||
invoke_psci_fn = __invoke_psci_fn_smc;
|
||||
} else {
|
||||
pr_warning("invalid \"method\" property: %s\n", method);
|
||||
goto out_put_node;
|
||||
pr_warn("invalid \"method\" property: %s\n", method);
|
||||
return -EINVAL;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
|
||||
{
|
||||
invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
|
||||
}
|
||||
|
||||
static void psci_sys_poweroff(void)
|
||||
{
|
||||
invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
|
||||
}
|
||||
|
||||
/*
|
||||
* PSCI Function IDs for v0.2+ are well defined so use
|
||||
* standard values.
|
||||
*/
|
||||
static int psci_0_2_init(struct device_node *np)
|
||||
{
|
||||
int err, ver;
|
||||
|
||||
err = get_set_conduit_method(np);
|
||||
|
||||
if (err)
|
||||
goto out_put_node;
|
||||
|
||||
ver = psci_get_version();
|
||||
|
||||
if (ver == PSCI_RET_NOT_SUPPORTED) {
|
||||
/* PSCI v0.2 mandates implementation of PSCI_ID_VERSION. */
|
||||
pr_err("PSCI firmware does not comply with the v0.2 spec.\n");
|
||||
err = -EOPNOTSUPP;
|
||||
goto out_put_node;
|
||||
} else {
|
||||
pr_info("PSCIv%d.%d detected in firmware.\n",
|
||||
PSCI_VERSION_MAJOR(ver),
|
||||
PSCI_VERSION_MINOR(ver));
|
||||
|
||||
if (PSCI_VERSION_MAJOR(ver) == 0 &&
|
||||
PSCI_VERSION_MINOR(ver) < 2) {
|
||||
err = -EINVAL;
|
||||
pr_err("Conflicting PSCI version detected.\n");
|
||||
goto out_put_node;
|
||||
}
|
||||
}
|
||||
|
||||
pr_info("Using standard PSCI v0.2 function IDs\n");
|
||||
psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_0_2_FN64_CPU_SUSPEND;
|
||||
psci_ops.cpu_suspend = psci_cpu_suspend;
|
||||
|
||||
psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF;
|
||||
psci_ops.cpu_off = psci_cpu_off;
|
||||
|
||||
psci_function_id[PSCI_FN_CPU_ON] = PSCI_0_2_FN64_CPU_ON;
|
||||
psci_ops.cpu_on = psci_cpu_on;
|
||||
|
||||
psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN64_MIGRATE;
|
||||
psci_ops.migrate = psci_migrate;
|
||||
|
||||
psci_function_id[PSCI_FN_AFFINITY_INFO] = PSCI_0_2_FN64_AFFINITY_INFO;
|
||||
psci_ops.affinity_info = psci_affinity_info;
|
||||
|
||||
psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE] =
|
||||
PSCI_0_2_FN_MIGRATE_INFO_TYPE;
|
||||
psci_ops.migrate_info_type = psci_migrate_info_type;
|
||||
|
||||
arm_pm_restart = psci_sys_reset;
|
||||
|
||||
pm_power_off = psci_sys_poweroff;
|
||||
|
||||
out_put_node:
|
||||
of_node_put(np);
|
||||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
* PSCI < v0.2 get PSCI Function IDs via DT.
|
||||
*/
|
||||
static int psci_0_1_init(struct device_node *np)
|
||||
{
|
||||
u32 id;
|
||||
int err;
|
||||
|
||||
err = get_set_conduit_method(np);
|
||||
|
||||
if (err)
|
||||
goto out_put_node;
|
||||
|
||||
pr_info("Using PSCI v0.1 Function IDs from DT\n");
|
||||
|
||||
if (!of_property_read_u32(np, "cpu_suspend", &id)) {
|
||||
psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
|
||||
@ -224,7 +329,28 @@ void __init psci_init(void)
|
||||
|
||||
out_put_node:
|
||||
of_node_put(np);
|
||||
return;
|
||||
return err;
|
||||
}
|
||||
|
||||
static const struct of_device_id psci_of_match[] __initconst = {
|
||||
{ .compatible = "arm,psci", .data = psci_0_1_init},
|
||||
{ .compatible = "arm,psci-0.2", .data = psci_0_2_init},
|
||||
{},
|
||||
};
|
||||
|
||||
int __init psci_init(void)
|
||||
{
|
||||
struct device_node *np;
|
||||
const struct of_device_id *matched_np;
|
||||
psci_initcall_t init_fn;
|
||||
|
||||
np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
|
||||
|
||||
if (!np)
|
||||
return -ENODEV;
|
||||
|
||||
init_fn = (psci_initcall_t)matched_np->data;
|
||||
return init_fn(np);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
|
||||
Loading…
Reference in New Issue
Block a user