mediatek: mt8192: Add CPU hotplug and MCDI support

Implement PSCI platform OPs to support CPU hotplug and MCDI. Change-Id: I31abfc752b69ac40e70bc9e7a55163eb39776c44 Signed-off-by: James Liao <jamesjj.liao@mediatek.com>
4 years ago · 82c00c2ff5
3 changed files with 350 additions and 13 deletions
--- a/plat/mediatek/mt8192/include/platform_def.h
+++ b/plat/mediatek/mt8192/include/platform_def.h
@ -70,11 +70,12 @@
 ******************************************************************************/
 #define PLATFORM_STACK_SIZE    0x800

-#define PLAT_MAX_PWR_LVL        U(2)
+#define PLAT_MAX_PWR_LVL        U(3)
 #define PLAT_MAX_RET_STATE      U(1)
-#define PLAT_MAX_OFF_STATE      U(2)
+#define PLAT_MAX_OFF_STATE      U(9)

 #define PLATFORM_SYSTEM_COUNT           U(1)
+#define PLATFORM_MCUSYS_COUNT           U(1)
 #define PLATFORM_CLUSTER_COUNT          U(1)
 #define PLATFORM_CLUSTER0_CORE_COUNT    U(8)
 #define PLATFORM_CORE_COUNT             (PLATFORM_CLUSTER0_CORE_COUNT)
--- a/plat/mediatek/mt8192/plat_pm.c
+++ b/plat/mediatek/mt8192/plat_pm.c
@ -5,17 +5,335 @@
 */

 /* common headers */
+#include <assert.h>
+
 #include <arch_helpers.h>
 #include <common/debug.h>
 #include <drivers/gpio.h>
 #include <lib/psci/psci.h>

-/* mediatek platform specific headers */
+/* platform specific headers */
+#include <mt_gic_v3.h>
+#include <mtspmc.h>
+#include <plat/common/platform.h>
+#include <plat_mtk_lpm.h>
 #include <plat_params.h>
+#include <plat_pm.h>
+
+/*
+ * Cluster state request:
+ * [0] : The CPU requires cluster power down
+ * [1] : The CPU requires cluster power on
+ */
+#define coordinate_cluster(onoff)	write_clusterpwrdn_el1(onoff)
+#define coordinate_cluster_pwron()	coordinate_cluster(1)
+#define coordinate_cluster_pwroff()	coordinate_cluster(0)
+
+/* platform secure entry point */
+static uintptr_t secure_entrypoint;
+/* per-CPU power state */
+static unsigned int plat_power_state[PLATFORM_CORE_COUNT];
+
+/* platform CPU power domain - ops */
+static const struct mt_lpm_tz *plat_mt_pm;
+
+#define plat_mt_pm_invoke(_name, _cpu, _state) ({ \
+	int ret = -1; \
+	if (plat_mt_pm != NULL && plat_mt_pm->_name != NULL) { \
+		ret = plat_mt_pm->_name(_cpu, _state); \
+	} \
+	ret; })
+
+#define plat_mt_pm_invoke_no_check(_name, _cpu, _state) ({ \
+	if (plat_mt_pm != NULL && plat_mt_pm->_name != NULL) { \
+		(void) plat_mt_pm->_name(_cpu, _state); \
+	} \
+	})
+
+/*
+ * Common MTK_platform operations to power on/off a
+ * CPU in response to a CPU_ON, CPU_OFF or CPU_SUSPEND request.
+ */
+
+static void plat_cpu_pwrdwn_common(unsigned int cpu,
+		const psci_power_state_t *state, unsigned int req_pstate)
+{
+	assert(cpu == plat_my_core_pos());
+
+	plat_mt_pm_invoke_no_check(pwr_cpu_dwn, cpu, state);
+
+	if ((psci_get_pstate_pwrlvl(req_pstate) >= MTK_AFFLVL_CLUSTER) ||
+			(req_pstate == 0U)) { /* hotplug off */
+		coordinate_cluster_pwroff();
+	}
+
+	/* Prevent interrupts from spuriously waking up this CPU */
+	mt_gic_rdistif_save();
+	gicv3_cpuif_disable(cpu);
+	gicv3_rdistif_off(cpu);
+}
+
+static void plat_cpu_pwron_common(unsigned int cpu,
+		const psci_power_state_t *state, unsigned int req_pstate)
+{
+	assert(cpu == plat_my_core_pos());
+
+	plat_mt_pm_invoke_no_check(pwr_cpu_on, cpu, state);
+
+	coordinate_cluster_pwron();
+
+	/* Enable the GIC CPU interface */
+	gicv3_rdistif_on(cpu);
+	gicv3_cpuif_enable(cpu);
+	mt_gic_rdistif_init();
+
+	/*
+	 * If mcusys does power down before then restore
+	 * all CPUs' GIC Redistributors
+	 */
+	if (IS_MCUSYS_OFF_STATE(state)) {
+		mt_gic_rdistif_restore_all();
+	} else {
+		mt_gic_rdistif_restore();
+	}
+}
+
+/*
+ * Common MTK_platform operations to power on/off a
+ * cluster in response to a CPU_ON, CPU_OFF or CPU_SUSPEND request.
+ */
+
+static void plat_cluster_pwrdwn_common(unsigned int cpu,
+		const psci_power_state_t *state, unsigned int req_pstate)
+{
+	assert(cpu == plat_my_core_pos());
+
+	if (plat_mt_pm_invoke(pwr_cluster_dwn, cpu, state) != 0) {
+		coordinate_cluster_pwron();
+
+		/* TODO: return on fail.
+		 *       Add a 'return' here before adding any code following
+		 *       the if-block.
+		 */
+	}
+}
+
+static void plat_cluster_pwron_common(unsigned int cpu,
+		const psci_power_state_t *state, unsigned int req_pstate)
+{
+	assert(cpu == plat_my_core_pos());
+
+	if (plat_mt_pm_invoke(pwr_cluster_on, cpu, state) != 0) {
+		/* TODO: return on fail.
+		 *       Add a 'return' here before adding any code following
+		 *       the if-block.
+		 */
+	}
+}
+
+/*
+ * Common MTK_platform operations to power on/off a
+ * mcusys in response to a CPU_ON, CPU_OFF or CPU_SUSPEND request.
+ */
+
+static void plat_mcusys_pwrdwn_common(unsigned int cpu,
+		const psci_power_state_t *state, unsigned int req_pstate)
+{
+	assert(cpu == plat_my_core_pos());
+
+	if (plat_mt_pm_invoke(pwr_mcusys_dwn, cpu, state) != 0) {
+		return;		/* return on fail */
+	}
+
+	mt_gic_distif_save();
+	gic_sgi_save_all();
+}
+
+static void plat_mcusys_pwron_common(unsigned int cpu,
+		const psci_power_state_t *state, unsigned int req_pstate)
+{
+	assert(cpu == plat_my_core_pos());
+
+	if (plat_mt_pm_invoke(pwr_mcusys_on, cpu, state) != 0) {
+		return;		/* return on fail */
+	}
+
+	mt_gic_init();
+	mt_gic_distif_restore();
+	gic_sgi_restore_all();
+
+	plat_mt_pm_invoke_no_check(pwr_mcusys_on_finished, cpu, state);
+}
+
+/*
+ * plat_psci_ops implementation
+ */
+
+static void plat_cpu_standby(plat_local_state_t cpu_state)
+{
+	uint64_t scr;
+
+	scr = read_scr_el3();
+	write_scr_el3(scr | SCR_IRQ_BIT | SCR_FIQ_BIT);
+
+	isb();
+	dsb();
+	wfi();
+
+	write_scr_el3(scr);
+}
+
+static int plat_power_domain_on(u_register_t mpidr)
+{
+	unsigned int cpu = (unsigned int)plat_core_pos_by_mpidr(mpidr);
+	unsigned int cluster = 0U;
+
+	if (cpu >= PLATFORM_CORE_COUNT) {
+		return PSCI_E_INVALID_PARAMS;
+	}
+
+	if (!spm_get_cluster_powerstate(cluster)) {
+		spm_poweron_cluster(cluster);
+	}
+
+	/* init CPU reset arch as AARCH64 */
+	mcucfg_init_archstate(cluster, cpu, true);
+	mcucfg_set_bootaddr(cluster, cpu, secure_entrypoint);
+	spm_poweron_cpu(cluster, cpu);
+
+	return PSCI_E_SUCCESS;
+}
+
+static void plat_power_domain_on_finish(const psci_power_state_t *state)
+{
+	unsigned long mpidr = read_mpidr_el1();
+	unsigned int cpu = (unsigned int)plat_core_pos_by_mpidr(mpidr);
+
+	assert(cpu < PLATFORM_CORE_COUNT);
+
+	/* Allow IRQs to wakeup this core in IDLE flow */
+	mcucfg_enable_gic_wakeup(0U, cpu);
+
+	if (IS_CLUSTER_OFF_STATE(state)) {
+		plat_cluster_pwron_common(cpu, state, 0U);
+	}
+
+	plat_cpu_pwron_common(cpu, state, 0U);
+}
+
+static void plat_power_domain_off(const psci_power_state_t *state)
+{
+	unsigned long mpidr = read_mpidr_el1();
+	unsigned int cpu = (unsigned int)plat_core_pos_by_mpidr(mpidr);
+
+	assert(cpu < PLATFORM_CORE_COUNT);
+
+	plat_cpu_pwrdwn_common(cpu, state, 0U);
+	spm_poweroff_cpu(0U, cpu);
+
+	/* prevent unintended IRQs from waking up the hot-unplugged core */
+	mcucfg_disable_gic_wakeup(0U, cpu);
+
+	if (IS_CLUSTER_OFF_STATE(state)) {
+		plat_cluster_pwrdwn_common(cpu, state, 0U);
+	}
+}
+
+static void plat_power_domain_suspend(const psci_power_state_t *state)
+{
+	unsigned int cpu = plat_my_core_pos();
+
+	assert(cpu < PLATFORM_CORE_COUNT);
+
+	plat_mt_pm_invoke_no_check(pwr_prompt, cpu, state);
+
+	/* Perform the common CPU specific operations */
+	plat_cpu_pwrdwn_common(cpu, state, plat_power_state[cpu]);
+
+	if (IS_CLUSTER_OFF_STATE(state)) {
+		/* Perform the common cluster specific operations */
+		plat_cluster_pwrdwn_common(cpu, state, plat_power_state[cpu]);
+	}
+
+	if (IS_MCUSYS_OFF_STATE(state)) {
+		/* Perform the common mcusys specific operations */
+		plat_mcusys_pwrdwn_common(cpu, state, plat_power_state[cpu]);
+	}
+}
+
+static void plat_power_domain_suspend_finish(const psci_power_state_t *state)
+{
+	unsigned int cpu = plat_my_core_pos();
+
+	assert(cpu < PLATFORM_CORE_COUNT);
+
+	if (IS_MCUSYS_OFF_STATE(state)) {
+		/* Perform the common mcusys specific operations */
+		plat_mcusys_pwron_common(cpu, state, plat_power_state[cpu]);
+	}
+
+	if (IS_CLUSTER_OFF_STATE(state)) {
+		/* Perform the common cluster specific operations */
+		plat_cluster_pwron_common(cpu, state, plat_power_state[cpu]);
+	}
+
+	/* Perform the common CPU specific operations */
+	plat_cpu_pwron_common(cpu, state, plat_power_state[cpu]);
+
+	plat_mt_pm_invoke_no_check(pwr_reflect, cpu, state);
+}
+
+static int plat_validate_power_state(unsigned int power_state,
+					psci_power_state_t *req_state)
+{
+	unsigned int pstate = psci_get_pstate_type(power_state);
+	unsigned int aff_lvl = psci_get_pstate_pwrlvl(power_state);
+	unsigned int cpu = plat_my_core_pos();
+
+	if (aff_lvl > PLAT_MAX_PWR_LVL) {
+		return PSCI_E_INVALID_PARAMS;
+	}
+
+	if (pstate == PSTATE_TYPE_STANDBY) {
+		req_state->pwr_domain_state[0] = PLAT_MAX_RET_STATE;
+	} else {
+		unsigned int i;
+		unsigned int pstate_id = psci_get_pstate_id(power_state);
+		plat_local_state_t s = MTK_LOCAL_STATE_OFF;
+
+		/* Use pstate_id to be power domain state */
+		if (pstate_id > s) {
+			s = (plat_local_state_t)pstate_id;
+		}
+
+		for (i = 0U; i <= aff_lvl; i++) {
+			req_state->pwr_domain_state[i] = s;
+		}
+	}
+
+	plat_power_state[cpu] = power_state;
+	return PSCI_E_SUCCESS;
+}
+
+static void plat_get_sys_suspend_power_state(psci_power_state_t *req_state)
+{
+	unsigned int lv;
+	unsigned int cpu = plat_my_core_pos();
+
+	for (lv = PSCI_CPU_PWR_LVL; lv <= PLAT_MAX_PWR_LVL; lv++) {
+		req_state->pwr_domain_state[lv] = PLAT_MAX_OFF_STATE;
+	}
+
+	plat_power_state[cpu] =
+			psci_make_powerstate(
+				MT_PLAT_PWR_STATE_SYSTEM_SUSPEND,
+				PSTATE_TYPE_POWERDOWN, PLAT_MAX_PWR_LVL);
+
+	flush_dcache_range((uintptr_t)
+			&plat_power_state[cpu],
+			sizeof(plat_power_state[cpu]));
+}

-/*******************************************************************************
- * MTK handlers to shutdown/reboot the system
- ******************************************************************************/
 static void __dead2 plat_mtk_system_reset(void)
 {
 	struct bl_aux_gpio_info *gpio_reset = plat_get_mtk_gpio_reset();
@ -29,18 +347,34 @@ static void __dead2 plat_mtk_system_reset(void)
 	panic();
 }

-/*******************************************************************************
- * MTK_platform handler called when an affinity instance is about to be turned
- * on. The level and mpidr determine the affinity instance.
- ******************************************************************************/
-static const plat_psci_ops_t plat_plat_pm_ops = {
-	.system_reset         = plat_mtk_system_reset,
+static const plat_psci_ops_t plat_psci_ops = {
+	.system_reset			= plat_mtk_system_reset,
+	.cpu_standby			= plat_cpu_standby,
+	.pwr_domain_on			= plat_power_domain_on,
+	.pwr_domain_on_finish		= plat_power_domain_on_finish,
+	.pwr_domain_off			= plat_power_domain_off,
+	.pwr_domain_suspend		= plat_power_domain_suspend,
+	.pwr_domain_suspend_finish	= plat_power_domain_suspend_finish,
+	.validate_power_state		= plat_validate_power_state,
+	.get_sys_suspend_power_state	= plat_get_sys_suspend_power_state
 };

 int plat_setup_psci_ops(uintptr_t sec_entrypoint,
 			const plat_psci_ops_t **psci_ops)
 {
-	*psci_ops = &plat_plat_pm_ops;
+	*psci_ops = &plat_psci_ops;
+	secure_entrypoint = sec_entrypoint;
+
+	/*
+	 * init the warm reset config for boot CPU
+	 * reset arch as AARCH64
+	 * reset addr as function bl31_warm_entrypoint()
+	 */
+	mcucfg_init_archstate(0U, 0U, true);
+	mcucfg_set_bootaddr(0U, 0U, secure_entrypoint);
+
+	spmc_init();
+	plat_mt_pm = mt_plat_cpu_pm_init();

 	return 0;
 }
--- a/plat/mediatek/mt8192/plat_topology.c
+++ b/plat/mediatek/mt8192/plat_topology.c
@ -17,6 +17,8 @@ const unsigned char mtk_power_domain_tree_desc[] = {
 	/* Number of root nodes */
 	PLATFORM_SYSTEM_COUNT,
 	/* Number of children for the root node */
+	PLATFORM_MCUSYS_COUNT,
+	/* Number of children for the mcusys node */
 	PLATFORM_CLUSTER_COUNT,
 	/* Number of children for the first cluster node */
 	PLATFORM_CLUSTER0_CORE_COUNT,