#include <linux/init.h>
#include <linux/of.h>
#include <linux/string.h>
-#include <linux/reboot.h>
-#include <linux/pm.h>
-#include <uapi/linux/psci.h>
#include <asm/compiler.h>
#include <asm/errno.h>
#include <asm/opcodes-sec.h>
#include <asm/opcodes-virt.h>
#include <asm/psci.h>
-#include <asm/system_misc.h>
struct psci_operations psci_ops;
#define PSCI_SUP_DISABLED 0
#define PSCI_SUP_ENABLED 1
+static unsigned int psci;
static int (*invoke_psci_fn)(u32, u32, u32, u32);
-typedef int (*psci_initcall_t)(const struct device_node *);
enum psci_function {
PSCI_FN_CPU_SUSPEND,
PSCI_FN_CPU_ON,
PSCI_FN_CPU_OFF,
PSCI_FN_MIGRATE,
- PSCI_FN_AFFINITY_INFO,
- PSCI_FN_MIGRATE_INFO_TYPE,
PSCI_FN_MAX,
};
static u32 psci_function_id[PSCI_FN_MAX];
+#define PSCI_RET_SUCCESS 0
+#define PSCI_RET_EOPNOTSUPP -1
+#define PSCI_RET_EINVAL -2
+#define PSCI_RET_EPERM -3
+#define PSCI_RET_EALREADYON -4
+
static int psci_to_linux_errno(int errno)
{
switch (errno) {
case PSCI_RET_SUCCESS:
return 0;
- case PSCI_RET_NOT_SUPPORTED:
+ case PSCI_RET_EOPNOTSUPP:
return -EOPNOTSUPP;
- case PSCI_RET_INVALID_PARAMS:
+ case PSCI_RET_EINVAL:
return -EINVAL;
- case PSCI_RET_DENIED:
+ case PSCI_RET_EPERM:
return -EPERM;
- case PSCI_RET_ALREADY_ON:
+ case PSCI_RET_EALREADYON:
return -EAGAIN;
};
return -EINVAL;
}
+#define PSCI_POWER_STATE_ID_MASK 0xffff
+#define PSCI_POWER_STATE_ID_SHIFT 0
+#define PSCI_POWER_STATE_TYPE_MASK 0x1
+#define PSCI_POWER_STATE_TYPE_SHIFT 16
+#define PSCI_POWER_STATE_AFFL_MASK 0x3
+#define PSCI_POWER_STATE_AFFL_SHIFT 24
+
static u32 psci_power_state_pack(struct psci_power_state state)
{
- return ((state.id << PSCI_0_2_POWER_STATE_ID_SHIFT)
- & PSCI_0_2_POWER_STATE_ID_MASK) |
- ((state.type << PSCI_0_2_POWER_STATE_TYPE_SHIFT)
- & PSCI_0_2_POWER_STATE_TYPE_MASK) |
- ((state.affinity_level << PSCI_0_2_POWER_STATE_AFFL_SHIFT)
- & PSCI_0_2_POWER_STATE_AFFL_MASK);
+ return ((state.id & PSCI_POWER_STATE_ID_MASK)
+ << PSCI_POWER_STATE_ID_SHIFT) |
+ ((state.type & PSCI_POWER_STATE_TYPE_MASK)
+ << PSCI_POWER_STATE_TYPE_SHIFT) |
+ ((state.affinity_level & PSCI_POWER_STATE_AFFL_MASK)
+ << PSCI_POWER_STATE_AFFL_SHIFT);
}
/*
return function_id;
}
-static int psci_get_version(void)
-{
- int err;
-
- err = invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
- return err;
-}
-
static int psci_cpu_suspend(struct psci_power_state state,
unsigned long entry_point)
{
return psci_to_linux_errno(err);
}
-static int psci_affinity_info(unsigned long target_affinity,
- unsigned long lowest_affinity_level)
-{
- int err;
- u32 fn;
-
- fn = psci_function_id[PSCI_FN_AFFINITY_INFO];
- err = invoke_psci_fn(fn, target_affinity, lowest_affinity_level, 0);
- return err;
-}
+static const struct of_device_id psci_of_match[] __initconst = {
+ { .compatible = "arm,psci", },
+ {},
+};
-static int psci_migrate_info_type(void)
+void __init psci_init(void)
{
- int err;
- u32 fn;
+ struct device_node *np;
+ const char *method;
+ u32 id;
- fn = psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE];
- err = invoke_psci_fn(fn, 0, 0, 0);
- return err;
-}
+ if (psci == PSCI_SUP_DISABLED)
+ return;
-static int get_set_conduit_method(struct device_node *np)
-{
- const char *method;
+ np = of_find_matching_node(NULL, psci_of_match);
+ if (!np)
+ return;
- pr_info("probing for conduit method from DT.\n");
+ pr_info("probing function IDs from device-tree\n");
if (of_property_read_string(np, "method", &method)) {
- pr_warn("missing \"method\" property\n");
- return -ENXIO;
+ pr_warning("missing \"method\" property\n");
+ goto out_put_node;
}
if (!strcmp("hvc", method)) {
} else if (!strcmp("smc", method)) {
invoke_psci_fn = __invoke_psci_fn_smc;
} else {
- 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)
+ pr_warning("invalid \"method\" property: %s\n", method);
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_FN_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_FN_CPU_ON;
- psci_ops.cpu_on = psci_cpu_on;
-
- psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN_MIGRATE;
- psci_ops.migrate = psci_migrate;
-
- psci_function_id[PSCI_FN_AFFINITY_INFO] = PSCI_0_2_FN_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;
psci_ops.cpu_suspend = psci_cpu_suspend;
out_put_node:
of_node_put(np);
- return err;
+ return;
}
-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)
+int __init psci_probe(void)
{
struct device_node *np;
- const struct of_device_id *matched_np;
- psci_initcall_t init_fn;
+ int ret = -ENODEV;
- np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
- if (!np)
- return -ENODEV;
+ if (psci == PSCI_SUP_ENABLED) {
+ np = of_find_matching_node(NULL, psci_of_match);
+ if (np)
+ ret = 0;
+ }
+
+ of_node_put(np);
+ return ret;
+}
+
+static int __init early_psci(char *val)
+{
+ int ret = 0;
+
+ if (strcmp(val, "enable") == 0)
+ psci = PSCI_SUP_ENABLED;
+ else if (strcmp(val, "disable") == 0)
+ psci = PSCI_SUP_DISABLED;
+ else
+ ret = -EINVAL;
- init_fn = (psci_initcall_t)matched_np->data;
- return init_fn(np);
+ return ret;
}
+early_param("psci", early_psci);
projects / firefly-linux-kernel-4.4.55.git / commitdiff