1 files changed, 243 insertions, 0 deletions
diff --git a/plat/st/stm32mp1/stm32mp1_pm.c b/plat/st/stm32mp1/stm32mp1_pm.c
new file mode 100644
index 0000000..6e438c4
--- /dev/null
+++ b/plat/st/stm32mp1/stm32mp1_pm.c
@@ -0,0 +1,243 @@
+/*
+ * Copyright (c) 2015-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <errno.h>
+
+#include <arch_helpers.h>
+#include <bl32/sp_min/platform_sp_min.h>
+#include <common/debug.h>
+#include <drivers/arm/gic_common.h>
+#include <drivers/arm/gicv2.h>
+#include <drivers/clk.h>
+#include <dt-bindings/clock/stm32mp1-clks.h>
+#include <lib/mmio.h>
+#include <lib/psci/psci.h>
+#include <plat/common/platform.h>
+
+#include <platform_def.h>
+
+static uintptr_t stm32_sec_entrypoint;
+static uint32_t cntfrq_core0;
+
+/*******************************************************************************
+ * STM32MP1 handler called when a CPU is about to enter standby.
+ * call by core 1 to enter in wfi
+ ******************************************************************************/
+static void stm32_cpu_standby(plat_local_state_t cpu_state)
+{
+	uint32_t interrupt = GIC_SPURIOUS_INTERRUPT;
+
+	assert(cpu_state == ARM_LOCAL_STATE_RET);
+
+	/*
+	 * Enter standby state
+	 * dsb is good practice before using wfi to enter low power states
+	 */
+	isb();
+	dsb();
+	while (interrupt == GIC_SPURIOUS_INTERRUPT) {
+		wfi();
+
+		/* Acknoledge IT */
+		interrupt = gicv2_acknowledge_interrupt();
+		/* If Interrupt == 1022 it will be acknowledged by non secure */
+		if ((interrupt != PENDING_G1_INTID) &&
+		    (interrupt != GIC_SPURIOUS_INTERRUPT)) {
+			gicv2_end_of_interrupt(interrupt);
+		}
+	}
+}
+
+/*******************************************************************************
+ * STM32MP1 handler called when a power domain is about to be turned on. The
+ * mpidr determines the CPU to be turned on.
+ * call by core 0 to activate core 1
+ ******************************************************************************/
+static int stm32_pwr_domain_on(u_register_t mpidr)
+{
+	unsigned long current_cpu_mpidr = read_mpidr_el1();
+	uintptr_t bkpr_core1_addr =
+		tamp_bkpr(BOOT_API_CORE1_BRANCH_ADDRESS_TAMP_BCK_REG_IDX);
+	uintptr_t bkpr_core1_magic =
+		tamp_bkpr(BOOT_API_CORE1_MAGIC_NUMBER_TAMP_BCK_REG_IDX);
+
+	if (mpidr == current_cpu_mpidr) {
+		return PSCI_E_INVALID_PARAMS;
+	}
+
+	/* Only one valid entry point */
+	if (stm32_sec_entrypoint != (uintptr_t)&sp_min_warm_entrypoint) {
+		return PSCI_E_INVALID_ADDRESS;
+	}
+
+	clk_enable(RTCAPB);
+
+	cntfrq_core0 = read_cntfrq_el0();
+
+	/* Write entrypoint in backup RAM register */
+	mmio_write_32(bkpr_core1_addr, stm32_sec_entrypoint);
+
+	/* Write magic number in backup register */
+	mmio_write_32(bkpr_core1_magic, BOOT_API_A7_CORE1_MAGIC_NUMBER);
+
+	clk_disable(RTCAPB);
+
+	/* Generate an IT to core 1 */
+	gicv2_raise_sgi(ARM_IRQ_SEC_SGI_0, false, STM32MP_SECONDARY_CPU);
+
+	return PSCI_E_SUCCESS;
+}
+
+/*******************************************************************************
+ * STM32MP1 handler called when a power domain is about to be turned off. The
+ * target_state encodes the power state that each level should transition to.
+ ******************************************************************************/
+static void stm32_pwr_domain_off(const psci_power_state_t *target_state)
+{
+	/* Nothing to do */
+}
+
+/*******************************************************************************
+ * STM32MP1 handler called when a power domain is about to be suspended. The
+ * target_state encodes the power state that each level should transition to.
+ ******************************************************************************/
+static void stm32_pwr_domain_suspend(const psci_power_state_t *target_state)
+{
+	/* Nothing to do, power domain is not disabled */
+}
+
+/*******************************************************************************
+ * STM32MP1 handler called when a power domain has just been powered on after
+ * being turned off earlier. The target_state encodes the low power state that
+ * each level has woken up from.
+ * call by core 1 just after wake up
+ ******************************************************************************/
+static void stm32_pwr_domain_on_finish(const psci_power_state_t *target_state)
+{
+	stm32mp1_gic_pcpu_init();
+
+	write_cntfrq_el0(cntfrq_core0);
+}
+
+/*******************************************************************************
+ * STM32MP1 handler called when a power domain has just been powered on after
+ * having been suspended earlier. The target_state encodes the low power state
+ * that each level has woken up from.
+ ******************************************************************************/
+static void stm32_pwr_domain_suspend_finish(const psci_power_state_t
+					    *target_state)
+{
+	/* Nothing to do, power domain is not disabled */
+}
+
+static void __dead2 stm32_pwr_domain_pwr_down_wfi(const psci_power_state_t
+						  *target_state)
+{
+	ERROR("stm32mpu1 Power Down WFI: operation not handled.\n");
+	panic();
+}
+
+static void __dead2 stm32_system_off(void)
+{
+	ERROR("stm32mpu1 System Off: operation not handled.\n");
+	panic();
+}
+
+static void __dead2 stm32_system_reset(void)
+{
+	mmio_setbits_32(stm32mp_rcc_base() + RCC_MP_GRSTCSETR,
+			RCC_MP_GRSTCSETR_MPSYSRST);
+
+	/* Loop in case system reset is not immediately caught */
+	for ( ; ; ) {
+		;
+	}
+}
+
+static int stm32_validate_power_state(unsigned int power_state,
+				      psci_power_state_t *req_state)
+{
+	int pstate = psci_get_pstate_type(power_state);
+
+	if (pstate != 0) {
+		return PSCI_E_INVALID_PARAMS;
+	}
+
+	if (psci_get_pstate_pwrlvl(power_state)) {
+		return PSCI_E_INVALID_PARAMS;
+	}
+
+	if (psci_get_pstate_id(power_state)) {
+		return PSCI_E_INVALID_PARAMS;
+	}
+
+	req_state->pwr_domain_state[0] = ARM_LOCAL_STATE_RET;
+	req_state->pwr_domain_state[1] = ARM_LOCAL_STATE_RUN;
+
+	return PSCI_E_SUCCESS;
+}
+
+static int stm32_validate_ns_entrypoint(uintptr_t entrypoint)
+{
+	/* The non-secure entry point must be in DDR */
+	if (entrypoint < STM32MP_DDR_BASE) {
+		return PSCI_E_INVALID_ADDRESS;
+	}
+
+	return PSCI_E_SUCCESS;
+}
+
+static int stm32_node_hw_state(u_register_t target_cpu,
+			       unsigned int power_level)
+{
+	/*
+	 * The format of 'power_level' is implementation-defined, but 0 must
+	 * mean a CPU. Only allow level 0.
+	 */
+	if (power_level != MPIDR_AFFLVL0) {
+		return PSCI_E_INVALID_PARAMS;
+	}
+
+	/*
+	 * From psci view the CPU 0 is always ON,
+	 * CPU 1 can be SUSPEND or RUNNING.
+	 * Therefore do not manage POWER OFF state and always return HW_ON.
+	 */
+
+	return (int)HW_ON;
+}
+
+/*******************************************************************************
+ * Export the platform handlers. The ARM Standard platform layer will take care
+ * of registering the handlers with PSCI.
+ ******************************************************************************/
+static const plat_psci_ops_t stm32_psci_ops = {
+	.cpu_standby = stm32_cpu_standby,
+	.pwr_domain_on = stm32_pwr_domain_on,
+	.pwr_domain_off = stm32_pwr_domain_off,
+	.pwr_domain_suspend = stm32_pwr_domain_suspend,
+	.pwr_domain_on_finish = stm32_pwr_domain_on_finish,
+	.pwr_domain_suspend_finish = stm32_pwr_domain_suspend_finish,
+	.pwr_domain_pwr_down_wfi = stm32_pwr_domain_pwr_down_wfi,
+	.system_off = stm32_system_off,
+	.system_reset = stm32_system_reset,
+	.validate_power_state = stm32_validate_power_state,
+	.validate_ns_entrypoint = stm32_validate_ns_entrypoint,
+	.get_node_hw_state = stm32_node_hw_state
+};
+
+/*******************************************************************************
+ * Export the platform specific power ops.
+ ******************************************************************************/
+int plat_setup_psci_ops(uintptr_t sec_entrypoint,
+			const plat_psci_ops_t **psci_ops)
+{
+	stm32_sec_entrypoint = sec_entrypoint;
+	*psci_ops = &stm32_psci_ops;
+
+	return 0;
+}