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authorJoseph Lo <josephl@nvidia.com>2014-12-09 15:11:54 +0800
committerPatrick Georgi <pgeorgi@google.com>2015-05-18 13:16:26 +0200
commitb7d0ffd1edb358c089c0fe94711aac65eeb81d6a (patch)
tree972780c79afbc4312feed40f0742829bb6ed4a10 /src
parent2e0425986fb1b5d4d5b57b2e2b7f5442e9823b0c (diff)
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arm64: psci: add cpu_suspend support
Implement the cpu_suspend for the PSCI service in secmon. BRANCH=none BUG=chrome-os-partner:39620 TEST=test with CPU idle driver that invoke the cpu_suspend of PSCI Change-Id: I4cdfab88bf36bf432fb33c56c1ea114b384528f8 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: 90b3ea3fcb21cb393e30a8359f0328054961f6d5 Original-Change-Id: Ieb76abc017b9c3e074cc018903cef72020306a8f Original-Signed-off-by: Joseph Lo <josephl@nvidia.com> Original-Reviewed-on: https://chromium-review.googlesource.com/269115 Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/10171 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src')
-rw-r--r--src/arch/arm64/armv8/secmon/psci.c133
-rw-r--r--src/arch/arm64/include/arch/psci.h36
2 files changed, 166 insertions, 3 deletions
diff --git a/src/arch/arm64/armv8/secmon/psci.c b/src/arch/arm64/armv8/secmon/psci.c
index 70251b2b0..f57a3e98f 100644
--- a/src/arch/arm64/armv8/secmon/psci.c
+++ b/src/arch/arm64/armv8/secmon/psci.c
@@ -207,6 +207,34 @@ static int psci_schedule_cpu_on(struct psci_node *e)
return PSCI_RET_SUCCESS;
}
+static void psci_cpu_resume_prepare(struct psci_cmd *cmd,
+ const struct cpu_action *a)
+{
+ struct psci_node *ancestor;
+ struct psci_node *e;
+ int state = PSCI_STATE_ON_PENDING;
+
+ e = cmd->target;
+ e->cpu_state.resume = *a;
+ ancestor = psci_find_ancestor(e, PSCI_AFFINITY_LEVEL_HIGHEST, state);
+ e->cpu_state.ancestor = ancestor;
+ cmd->ancestor = ancestor;
+}
+
+static void psci_schedule_cpu_resume(struct psci_node *e)
+{
+ struct cpu_info *ci;
+ struct cpu_action *action;
+
+ if (e->cpu_state.resume.run == NULL)
+ return;
+
+ ci = e->cpu_state.ci;
+ action = &e->cpu_state.resume;
+
+ arch_run_on_cpu(ci->id, action);
+}
+
void psci_turn_on_self(const struct cpu_action *action)
{
struct psci_node *e = node_self();
@@ -233,13 +261,111 @@ void psci_turn_on_self(const struct cpu_action *action)
void psci_cpu_entry(void)
{
gic_enable();
+
/*
- * Just wait for an action to be performed. Only CPU_ON is supported
- * initially. i.e. no power down then wake.
+ * Just wait for an action to be performed.
*/
+ psci_schedule_cpu_resume(node_self());
secmon_wait_for_action();
}
+static void psci_cpu_resume(void *arg)
+{
+ uint64_t power_state = (uint64_t)arg;
+ struct psci_node *e;
+ struct psci_power_state state;
+ struct psci_cmd cmd = {
+ .type = PSCI_CMD_RESUME,
+ };
+
+ psci_power_state_unpack(power_state, &state);
+
+ psci_lock();
+
+ e = node_self();
+ /* clear the resume action after resume */
+ e->cpu_state.resume.run = NULL;
+ e->cpu_state.resume.arg = NULL;
+
+ cmd.target = e;
+ cmd.state = &state;
+ soc_psci_ops.cmd_prepare(&cmd);
+
+ psci_unlock();
+
+ soc_psci_ops.cmd_commit(&cmd);
+
+ psci_lock();
+ psci_set_hierarchy_state(e, e->cpu_state.ancestor, PSCI_STATE_ON);
+ psci_unlock();
+
+ psci_schedule_cpu_on(node_self());
+}
+
+static void psci_cpu_suspend(struct psci_func *pf)
+{
+ uint64_t power_state;
+ uint64_t entry;
+ uint64_t context_id;
+ struct psci_node *e;
+ struct psci_power_state state;
+ struct cpu_action action;
+ struct cpu_action resume_action;
+ struct psci_cmd cmd = {
+ .type = PSCI_CMD_SUSPEND,
+ };
+ int ret;
+
+ power_state = psci64_arg(pf, PSCI_PARAM_0);
+ entry = psci64_arg(pf, PSCI_PARAM_1);
+ context_id = psci64_arg(pf, PSCI_PARAM_2);
+ psci_power_state_unpack(power_state, &state);
+
+ psci_lock();
+
+ e = node_self();
+ cmd.target = e;
+ cmd.state = &state;
+ action.run = (void *)entry;
+ action.arg = (void *)context_id;
+ resume_action.run = &psci_cpu_resume;
+ resume_action.arg = (void*)power_state;
+
+ psci_cpu_on_prepare(&cmd, &action);
+ psci_cpu_resume_prepare(&cmd, &resume_action);
+
+ ret = soc_psci_ops.cmd_prepare(&cmd);
+
+ if (ret == PSCI_RET_SUCCESS)
+ psci_set_hierarchy_state(e, cmd.ancestor, PSCI_STATE_OFF);
+
+ psci_unlock();
+
+ if (ret != PSCI_RET_SUCCESS)
+ return psci32_return(pf, ret);
+
+ gic_disable();
+
+ ret = soc_psci_ops.cmd_commit(&cmd);
+
+ /* PSCI_POWER_STATE_TYPE_STANDBY mode only */
+
+ psci_lock();
+ resume_action.run = NULL;
+ resume_action.arg = NULL;
+ psci_cpu_resume_prepare(&cmd, &resume_action);
+ psci_unlock();
+
+ if (ret != PSCI_RET_SUCCESS)
+ return psci32_return(pf, ret);
+
+ psci_lock();
+ psci_set_hierarchy_state(e, e->cpu_state.ancestor, PSCI_STATE_ON);
+ psci_unlock();
+
+ psci32_return(pf, PSCI_RET_SUCCESS);
+}
+
static void psci_cpu_on(struct psci_func *pf)
{
uint64_t entry;
@@ -369,6 +495,9 @@ static int psci_handler(struct smc_call *smc)
psci_func_init(pf, smc);
switch (pf->id) {
+ case PSCI_CPU_SUSPEND64:
+ psci_cpu_suspend(pf);
+ break;
case PSCI_CPU_ON64:
psci_cpu_on(pf);
break;
diff --git a/src/arch/arm64/include/arch/psci.h b/src/arch/arm64/include/arch/psci.h
index 47c902828..1c28dc45d 100644
--- a/src/arch/arm64/include/arch/psci.h
+++ b/src/arch/arm64/include/arch/psci.h
@@ -24,6 +24,25 @@
#include <arch/cpu.h>
#include <arch/smc.h>
+/* PSCI v0.2 power state encoding for CPU_SUSPEND function */
+#define PSCI_0_2_POWER_STATE_ID_MASK 0xffff
+#define PSCI_0_2_POWER_STATE_ID_SHIFT 0
+#define PSCI_0_2_POWER_STATE_TYPE_SHIFT 16
+#define PSCI_0_2_POWER_STATE_TYPE_MASK \
+ (0x1 << PSCI_0_2_POWER_STATE_TYPE_SHIFT)
+#define PSCI_0_2_POWER_STATE_AFFL_SHIFT 24
+#define PSCI_0_2_POWER_STATE_AFFL_MASK \
+ (0x3 << PSCI_0_2_POWER_STATE_AFFL_SHIFT)
+
+#define PSCI_POWER_STATE_TYPE_STANDBY 0
+#define PSCI_POWER_STATE_TYPE_POWER_DOWN 1
+
+struct psci_power_state {
+ u16 id;
+ u8 type;
+ u8 affinity_level;
+};
+
/* Return Values */
enum {
PSCI_RET_SUCCESS = 0,
@@ -64,6 +83,7 @@ struct psci_node;
struct psci_cpu_state {
struct cpu_info *ci;
struct cpu_action startup;
+ struct cpu_action resume;
/* Ancestor of target to update state in CPU_ON case. */
struct psci_node *ancestor;
};
@@ -107,7 +127,8 @@ static inline int psci_root_node(const struct psci_node *n)
enum {
PSCI_CMD_ON,
PSCI_CMD_OFF,
- PSCI_CMD_STANDBY,
+ PSCI_CMD_SUSPEND,
+ PSCI_CMD_RESUME,
};
/*
@@ -127,6 +148,7 @@ struct psci_cmd {
* A value of -1 indicates a CPU_OFF request.
*/
int state_id;
+ struct psci_power_state *state;
/*
* target is the command's target, but it can affect up to the
* ancestor entity. If target == ancestor then it only affects
@@ -184,6 +206,18 @@ struct psci_func {
struct smc_call *smc;
};
+static inline void psci_power_state_unpack(uint32_t power_state,
+ struct psci_power_state *state)
+{
+ state->id = (power_state & PSCI_0_2_POWER_STATE_ID_MASK) >>
+ PSCI_0_2_POWER_STATE_ID_SHIFT;
+ state->type = (power_state & PSCI_0_2_POWER_STATE_TYPE_MASK) >>
+ PSCI_0_2_POWER_STATE_TYPE_SHIFT;
+ state->affinity_level =
+ (power_state & PSCI_0_2_POWER_STATE_AFFL_MASK) >>
+ PSCI_0_2_POWER_STATE_AFFL_SHIFT;
+}
+
static inline void psci_func_init(struct psci_func *pf, struct smc_call *smc)
{
pf->id = smc_function_id(smc);