GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/trusted-firmware/trusted-firmware-a-2.8/plat/allwinner/common/sunxi_scpi_pm.c

@@ -0,0 +1,207 @@
+/*
+ * Copyright (c) 2017-2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+
+#include <platform_def.h>
+
+#include <arch_helpers.h>
+#include <common/debug.h>
+#include <drivers/arm/css/css_scpi.h>
+#include <drivers/arm/gicv2.h>
+#include <lib/mmio.h>
+#include <lib/psci/psci.h>
+
+#include <sunxi_mmap.h>
+#include <sunxi_private.h>
+
+/*
+ * The addresses for the SCP exception vectors are defined in the or1k
+ * architecture specification.
+ */
+#define OR1K_VEC_FIRST			0x01
+#define OR1K_VEC_LAST			0x0e
+#define OR1K_VEC_ADDR(n)		(0x100 * (n))
+
+/*
+ * This magic value is the little-endian representation of the or1k
+ * instruction "l.mfspr r2, r0, 0x12", which is guaranteed to be the
+ * first instruction in the SCP firmware.
+ */
+#define SCP_FIRMWARE_MAGIC		0xb4400012
+
+#define PLAT_LOCAL_PSTATE_WIDTH		U(4)
+#define PLAT_LOCAL_PSTATE_MASK		((U(1) << PLAT_LOCAL_PSTATE_WIDTH) - 1)
+
+#define CPU_PWR_LVL			MPIDR_AFFLVL0
+#define CLUSTER_PWR_LVL			MPIDR_AFFLVL1
+#define SYSTEM_PWR_LVL			MPIDR_AFFLVL2
+
+#define CPU_PWR_STATE(state) \
+	((state)->pwr_domain_state[CPU_PWR_LVL])
+#define CLUSTER_PWR_STATE(state) \
+	((state)->pwr_domain_state[CLUSTER_PWR_LVL])
+#define SYSTEM_PWR_STATE(state) \
+	((state)->pwr_domain_state[SYSTEM_PWR_LVL])
+
+static void sunxi_cpu_standby(plat_local_state_t cpu_state)
+{
+	u_register_t scr = read_scr_el3();
+
+	assert(is_local_state_retn(cpu_state));
+
+	write_scr_el3(scr | SCR_IRQ_BIT);
+	wfi();
+	write_scr_el3(scr);
+}
+
+static int sunxi_pwr_domain_on(u_register_t mpidr)
+{
+	scpi_set_css_power_state(mpidr,
+				 scpi_power_on,
+				 scpi_power_on,
+				 scpi_power_on);
+
+	return PSCI_E_SUCCESS;
+}
+
+static void sunxi_pwr_domain_off(const psci_power_state_t *target_state)
+{
+	plat_local_state_t cpu_pwr_state     = CPU_PWR_STATE(target_state);
+	plat_local_state_t cluster_pwr_state = CLUSTER_PWR_STATE(target_state);
+	plat_local_state_t system_pwr_state  = SYSTEM_PWR_STATE(target_state);
+
+	if (is_local_state_off(cpu_pwr_state)) {
+		gicv2_cpuif_disable();
+	}
+
+	scpi_set_css_power_state(read_mpidr(),
+				 cpu_pwr_state,
+				 cluster_pwr_state,
+				 system_pwr_state);
+}
+
+static void sunxi_pwr_domain_on_finish(const psci_power_state_t *target_state)
+{
+	if (is_local_state_off(SYSTEM_PWR_STATE(target_state))) {
+		gicv2_distif_init();
+	}
+	if (is_local_state_off(CPU_PWR_STATE(target_state))) {
+		gicv2_pcpu_distif_init();
+		gicv2_cpuif_enable();
+	}
+}
+
+static void __dead2 sunxi_system_off(void)
+{
+	uint32_t ret;
+
+	gicv2_cpuif_disable();
+
+	/* Send the power down request to the SCP. */
+	ret = scpi_sys_power_state(scpi_system_shutdown);
+	if (ret != SCP_OK) {
+		ERROR("PSCI: SCPI %s failed: %d\n", "shutdown", ret);
+	}
+
+	psci_power_down_wfi();
+}
+
+static void __dead2 sunxi_system_reset(void)
+{
+	uint32_t ret;
+
+	gicv2_cpuif_disable();
+
+	/* Send the system reset request to the SCP. */
+	ret = scpi_sys_power_state(scpi_system_reboot);
+	if (ret != SCP_OK) {
+		ERROR("PSCI: SCPI %s failed: %d\n", "reboot", ret);
+	}
+
+	psci_power_down_wfi();
+}
+
+static int sunxi_validate_power_state(unsigned int power_state,
+				      psci_power_state_t *req_state)
+{
+	unsigned int power_level = psci_get_pstate_pwrlvl(power_state);
+	unsigned int state_id = psci_get_pstate_id(power_state);
+	unsigned int type = psci_get_pstate_type(power_state);
+	unsigned int i;
+
+	assert(req_state != NULL);
+
+	if (power_level > PLAT_MAX_PWR_LVL) {
+		return PSCI_E_INVALID_PARAMS;
+	}
+
+	if (type == PSTATE_TYPE_STANDBY) {
+		return PSCI_E_INVALID_PARAMS;
+	}
+
+	/* Pass through the requested PSCI state as-is. */
+	for (i = 0; i <= power_level; ++i) {
+		unsigned int local_pstate = state_id & PLAT_LOCAL_PSTATE_MASK;
+
+		req_state->pwr_domain_state[i] = local_pstate;
+		state_id >>= PLAT_LOCAL_PSTATE_WIDTH;
+	}
+
+	/* Higher power domain levels should all remain running */
+	for (; i <= PLAT_MAX_PWR_LVL; ++i) {
+		req_state->pwr_domain_state[i] = PSCI_LOCAL_STATE_RUN;
+	}
+
+	return PSCI_E_SUCCESS;
+}
+
+static void sunxi_get_sys_suspend_power_state(psci_power_state_t *req_state)
+{
+	assert(req_state != NULL);
+
+	for (unsigned int i = 0; i <= PLAT_MAX_PWR_LVL; ++i) {
+		req_state->pwr_domain_state[i] = PLAT_MAX_OFF_STATE;
+	}
+}
+
+static const plat_psci_ops_t sunxi_scpi_psci_ops = {
+	.cpu_standby			= sunxi_cpu_standby,
+	.pwr_domain_on			= sunxi_pwr_domain_on,
+	.pwr_domain_off			= sunxi_pwr_domain_off,
+	.pwr_domain_suspend		= sunxi_pwr_domain_off,
+	.pwr_domain_on_finish		= sunxi_pwr_domain_on_finish,
+	.pwr_domain_suspend_finish	= sunxi_pwr_domain_on_finish,
+	.system_off			= sunxi_system_off,
+	.system_reset			= sunxi_system_reset,
+	.validate_power_state		= sunxi_validate_power_state,
+	.validate_ns_entrypoint		= sunxi_validate_ns_entrypoint,
+	.get_sys_suspend_power_state	= sunxi_get_sys_suspend_power_state,
+};
+
+int sunxi_set_scpi_psci_ops(const plat_psci_ops_t **psci_ops)
+{
+	*psci_ops = &sunxi_scpi_psci_ops;
+
+	/* Check for a valid SCP firmware. */
+	if (mmio_read_32(SUNXI_SCP_BASE) != SCP_FIRMWARE_MAGIC) {
+		return -1;
+	}
+
+	/* Program SCP exception vectors to the firmware entrypoint. */
+	for (unsigned int i = OR1K_VEC_FIRST; i <= OR1K_VEC_LAST; ++i) {
+		uint32_t vector = SUNXI_SRAM_A2_BASE + OR1K_VEC_ADDR(i);
+		uint32_t offset = SUNXI_SCP_BASE - vector;
+
+		mmio_write_32(vector, offset >> 2);
+	}
+
+	/* Take the SCP out of reset. */
+	mmio_setbits_32(SUNXI_R_CPUCFG_BASE, BIT(0));
+
+	/* Wait for the SCP firmware to boot. */
+	return scpi_wait_ready();
+}