synquacer: Enable PSCI framework

PSCI framework uses SCPI driver to communicate to SCP firmware for
various power management operations. Following PSCI operations are
supported:
- CPU ON
- CPU OFF
- CPU STANDBY
- SYSTEM RESET
- SYSTEM OFF

Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>

plat/socionext/synquacer/include/platform_def.h

@@ -15,6 +15,14 @@
 #define PLATFORM_CORE_COUNT		(PLAT_CLUSTER_COUNT *	\
 					 PLAT_MAX_CORES_PER_CLUSTER)
 
+#define PLAT_MAX_PWR_LVL		1
+#define PLAT_MAX_RET_STATE		1
+#define PLAT_MAX_OFF_STATE		2
+
+#define SQ_LOCAL_STATE_RUN		0
+#define SQ_LOCAL_STATE_RET		1
+#define SQ_LOCAL_STATE_OFF		2
+
 #define CACHE_WRITEBACK_SHIFT		6
 #define CACHE_WRITEBACK_GRANULE		(1 << CACHE_WRITEBACK_SHIFT)
 
@@ -68,4 +76,6 @@
 #define PLAT_SQ_GICD_BASE		0x30000000
 #define PLAT_SQ_GICR_BASE		0x30400000
 
+#define PLAT_SQ_GPIO_BASE		0x51000000
+
 #endif /* __PLATFORM_DEF_H__ */

plat/socionext/synquacer/sq_psci.c

@@ -0,0 +1,188 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch_helpers.h>
+#include <assert.h>
+#include <cassert.h>
+#include <debug.h>
+#include <delay_timer.h>
+#include <errno.h>
+#include <generic_delay_timer.h>
+#include <platform_def.h>
+#include <sq_common.h>
+#include "sq_scpi.h"
+#include <psci.h>
+
+/* Macros to read the SQ power domain state */
+#define SQ_PWR_LVL0	MPIDR_AFFLVL0
+#define SQ_PWR_LVL1	MPIDR_AFFLVL1
+#define SQ_PWR_LVL2	MPIDR_AFFLVL2
+
+#define SQ_CORE_PWR_STATE(state)	(state)->pwr_domain_state[SQ_PWR_LVL0]
+#define SQ_CLUSTER_PWR_STATE(state)	(state)->pwr_domain_state[SQ_PWR_LVL1]
+#define SQ_SYSTEM_PWR_STATE(state)	((PLAT_MAX_PWR_LVL > SQ_PWR_LVL1) ?\
+				(state)->pwr_domain_state[SQ_PWR_LVL2] : 0)
+
+uintptr_t sq_sec_entrypoint;
+
+int sq_pwr_domain_on(u_register_t mpidr)
+{
+	/*
+	 * SCP takes care of powering up parent power domains so we
+	 * only need to care about level 0
+	 */
+	scpi_set_sq_power_state(mpidr, scpi_power_on, scpi_power_on,
+				 scpi_power_on);
+
+	return PSCI_E_SUCCESS;
+}
+
+static void sq_pwr_domain_on_finisher_common(
+		const psci_power_state_t *target_state)
+{
+	assert(SQ_CORE_PWR_STATE(target_state) == SQ_LOCAL_STATE_OFF);
+
+	/*
+	 * Perform the common cluster specific operations i.e enable coherency
+	 * if this cluster was off.
+	 */
+	if (SQ_CLUSTER_PWR_STATE(target_state) == SQ_LOCAL_STATE_OFF)
+		plat_sq_interconnect_enter_coherency();
+}
+
+void sq_pwr_domain_on_finish(const psci_power_state_t *target_state)
+{
+	/* Assert that the system power domain need not be initialized */
+	assert(SQ_SYSTEM_PWR_STATE(target_state) == SQ_LOCAL_STATE_RUN);
+
+	sq_pwr_domain_on_finisher_common(target_state);
+
+	/* Program the gic per-cpu distributor or re-distributor interface */
+	sq_gic_pcpu_init();
+
+	/* Enable the gic cpu interface */
+	sq_gic_cpuif_enable();
+}
+
+static void sq_power_down_common(const psci_power_state_t *target_state)
+{
+	uint32_t cluster_state = scpi_power_on;
+	uint32_t system_state = scpi_power_on;
+
+	/* Prevent interrupts from spuriously waking up this cpu */
+	sq_gic_cpuif_disable();
+
+	/* Check if power down at system power domain level is requested */
+	if (SQ_SYSTEM_PWR_STATE(target_state) == SQ_LOCAL_STATE_OFF)
+		system_state = scpi_power_retention;
+
+	/* Cluster is to be turned off, so disable coherency */
+	if (SQ_CLUSTER_PWR_STATE(target_state) == SQ_LOCAL_STATE_OFF) {
+		plat_sq_interconnect_exit_coherency();
+		cluster_state = scpi_power_off;
+	}
+
+	/*
+	 * Ask the SCP to power down the appropriate components depending upon
+	 * their state.
+	 */
+	scpi_set_sq_power_state(read_mpidr_el1(),
+				 scpi_power_off,
+				 cluster_state,
+				 system_state);
+}
+
+void sq_pwr_domain_off(const psci_power_state_t *target_state)
+{
+	sq_power_down_common(target_state);
+}
+
+void __dead2 sq_system_off(void)
+{
+	volatile uint32_t *gpio = (uint32_t *)PLAT_SQ_GPIO_BASE;
+
+	/* set PD[9] high to power off the system */
+	gpio[5] |= 0x2;		/* set output */
+	gpio[1] |= 0x2;		/* set high */
+	dmbst();
+
+	generic_delay_timer_init();
+
+	mdelay(1);
+
+	while (1) {
+		gpio[1] &= ~0x2;	/* set low */
+		dmbst();
+
+		mdelay(1);
+
+		gpio[1] |= 0x2;		/* set high */
+		dmbst();
+
+		mdelay(100);
+	}
+
+	wfi();
+	ERROR("SQ System Off: operation not handled.\n");
+	panic();
+}
+
+void __dead2 sq_system_reset(void)
+{
+	uint32_t response;
+
+	/* Send the system reset request to the SCP */
+	response = scpi_sys_power_state(scpi_system_reboot);
+
+	if (response != SCP_OK) {
+		ERROR("SQ System Reset: SCP error %u.\n", response);
+		panic();
+	}
+	wfi();
+	ERROR("SQ System Reset: operation not handled.\n");
+	panic();
+}
+
+void sq_cpu_standby(plat_local_state_t cpu_state)
+{
+	unsigned int scr;
+
+	assert(cpu_state == SQ_LOCAL_STATE_RET);
+
+	scr = read_scr_el3();
+	/* Enable PhysicalIRQ bit for NS world to wake the CPU */
+	write_scr_el3(scr | SCR_IRQ_BIT);
+	isb();
+	dsb();
+	wfi();
+
+	/*
+	 * Restore SCR to the original value, synchronisation of scr_el3 is
+	 * done by eret while el3_exit to save some execution cycles.
+	 */
+	write_scr_el3(scr);
+}
+
+const plat_psci_ops_t sq_psci_ops = {
+	.pwr_domain_on		= sq_pwr_domain_on,
+	.pwr_domain_off		= sq_pwr_domain_off,
+	.pwr_domain_on_finish	= sq_pwr_domain_on_finish,
+	.cpu_standby		= sq_cpu_standby,
+	.system_off		= sq_system_off,
+	.system_reset		= sq_system_reset,
+};
+
+int plat_setup_psci_ops(uintptr_t sec_entrypoint,
+			const struct plat_psci_ops **psci_ops)
+{
+	sq_sec_entrypoint = sec_entrypoint;
+	flush_dcache_range((uint64_t)&sq_sec_entrypoint,
+			   sizeof(sq_sec_entrypoint));
+
+	*psci_ops = &sq_psci_ops;
+
+	return 0;
+}