1 files changed, 274 insertions, 0 deletions
diff --git a/plat/rpi/common/rpi3_pm.c b/plat/rpi/common/rpi3_pm.c
new file mode 100644
index 0000000..d98ac66
--- /dev/null
+++ b/plat/rpi/common/rpi3_pm.c
@@ -0,0 +1,274 @@
+/*
+ * Copyright (c) 2015-2018, 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/console.h>
+#include <lib/mmio.h>
+#include <lib/psci/psci.h>
+#include <plat/common/platform.h>
+
+#include <rpi_hw.h>
+
+#ifdef RPI_HAVE_GIC
+#include <drivers/arm/gicv2.h>
+#endif
+
+/* Make composite power state parameter till power level 0 */
+#if PSCI_EXTENDED_STATE_ID
+
+#define rpi3_make_pwrstate_lvl0(lvl0_state, pwr_lvl, type) \
+		(((lvl0_state) << PSTATE_ID_SHIFT) | \
+		 ((type) << PSTATE_TYPE_SHIFT))
+
+#else
+
+#define rpi3_make_pwrstate_lvl0(lvl0_state, pwr_lvl, type) \
+		(((lvl0_state) << PSTATE_ID_SHIFT) | \
+		 ((pwr_lvl) << PSTATE_PWR_LVL_SHIFT) | \
+		 ((type) << PSTATE_TYPE_SHIFT))
+
+#endif /* PSCI_EXTENDED_STATE_ID */
+
+#define rpi3_make_pwrstate_lvl1(lvl1_state, lvl0_state, pwr_lvl, type) \
+		(((lvl1_state) << PLAT_LOCAL_PSTATE_WIDTH) | \
+		 rpi3_make_pwrstate_lvl0(lvl0_state, pwr_lvl, type))
+
+/*
+ *  The table storing the valid idle power states. Ensure that the
+ *  array entries are populated in ascending order of state-id to
+ *  enable us to use binary search during power state validation.
+ *  The table must be terminated by a NULL entry.
+ */
+static const unsigned int rpi3_pm_idle_states[] = {
+	/* State-id - 0x01 */
+	rpi3_make_pwrstate_lvl1(PLAT_LOCAL_STATE_RUN, PLAT_LOCAL_STATE_RET,
+				MPIDR_AFFLVL0, PSTATE_TYPE_STANDBY),
+	/* State-id - 0x02 */
+	rpi3_make_pwrstate_lvl1(PLAT_LOCAL_STATE_RUN, PLAT_LOCAL_STATE_OFF,
+				MPIDR_AFFLVL0, PSTATE_TYPE_POWERDOWN),
+	/* State-id - 0x22 */
+	rpi3_make_pwrstate_lvl1(PLAT_LOCAL_STATE_OFF, PLAT_LOCAL_STATE_OFF,
+				MPIDR_AFFLVL1, PSTATE_TYPE_POWERDOWN),
+	0,
+};
+
+/*******************************************************************************
+ * Platform handler called to check the validity of the power state
+ * parameter. The power state parameter has to be a composite power state.
+ ******************************************************************************/
+static int rpi3_validate_power_state(unsigned int power_state,
+				     psci_power_state_t *req_state)
+{
+	unsigned int state_id;
+	int i;
+
+	assert(req_state != 0);
+
+	/*
+	 *  Currently we are using a linear search for finding the matching
+	 *  entry in the idle power state array. This can be made a binary
+	 *  search if the number of entries justify the additional complexity.
+	 */
+	for (i = 0; rpi3_pm_idle_states[i] != 0; i++) {
+		if (power_state == rpi3_pm_idle_states[i]) {
+			break;
+		}
+	}
+
+	/* Return error if entry not found in the idle state array */
+	if (!rpi3_pm_idle_states[i]) {
+		return PSCI_E_INVALID_PARAMS;
+	}
+
+	i = 0;
+	state_id = psci_get_pstate_id(power_state);
+
+	/* Parse the State ID and populate the state info parameter */
+	while (state_id) {
+		req_state->pwr_domain_state[i++] = state_id &
+						PLAT_LOCAL_PSTATE_MASK;
+		state_id >>= PLAT_LOCAL_PSTATE_WIDTH;
+	}
+
+	return PSCI_E_SUCCESS;
+}
+
+/*******************************************************************************
+ * Platform handler called when a CPU is about to enter standby.
+ ******************************************************************************/
+static void rpi3_cpu_standby(plat_local_state_t cpu_state)
+{
+	assert(cpu_state == PLAT_LOCAL_STATE_RET);
+
+	/*
+	 * Enter standby state.
+	 * dsb is good practice before using wfi to enter low power states
+	 */
+	dsb();
+	wfi();
+}
+
+static void rpi3_pwr_domain_off(const psci_power_state_t *target_state)
+{
+#ifdef RPI_HAVE_GIC
+	gicv2_cpuif_disable();
+#endif
+}
+
+/*******************************************************************************
+ * Platform handler called when a power domain is about to be turned on. The
+ * mpidr determines the CPU to be turned on.
+ ******************************************************************************/
+static int rpi3_pwr_domain_on(u_register_t mpidr)
+{
+	int rc = PSCI_E_SUCCESS;
+	unsigned int pos = plat_core_pos_by_mpidr(mpidr);
+	uintptr_t hold_base = PLAT_RPI3_TM_HOLD_BASE;
+
+	assert(pos < PLATFORM_CORE_COUNT);
+
+	hold_base += pos * PLAT_RPI3_TM_HOLD_ENTRY_SIZE;
+
+	mmio_write_64(hold_base, PLAT_RPI3_TM_HOLD_STATE_GO);
+	/* No cache maintenance here, hold_base is mapped as device memory. */
+
+	/* Make sure that the write has completed */
+	dsb();
+	isb();
+
+	sev();
+
+	return rc;
+}
+
+/*******************************************************************************
+ * Platform 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.
+ ******************************************************************************/
+static void rpi3_pwr_domain_on_finish(const psci_power_state_t *target_state)
+{
+	assert(target_state->pwr_domain_state[MPIDR_AFFLVL0] ==
+					PLAT_LOCAL_STATE_OFF);
+
+#ifdef RPI_HAVE_GIC
+	gicv2_pcpu_distif_init();
+	gicv2_cpuif_enable();
+#endif
+}
+
+static void __dead2 rpi3_pwr_down_wfi(
+		const psci_power_state_t *target_state)
+{
+	uintptr_t hold_base = PLAT_RPI3_TM_HOLD_BASE;
+	unsigned int pos = plat_my_core_pos();
+
+	if (pos == 0) {
+		/*
+		 * The secondaries will always be in a wait
+		 * for warm boot on reset, but the BSP needs
+		 * to be able to distinguish between waiting
+		 * for warm boot (e.g. after psci_off, waiting
+		 * for psci_on) and a cold boot.
+		 */
+		mmio_write_64(hold_base, PLAT_RPI3_TM_HOLD_STATE_BSP_OFF);
+		/* No cache maintenance here, we run with caches off already. */
+		dsb();
+		isb();
+	}
+
+	write_rmr_el3(RMR_EL3_RR_BIT | RMR_EL3_AA64_BIT);
+
+	while (1) {
+		wfi();
+	}
+}
+
+/*******************************************************************************
+ * Platform handlers for system reset and system off.
+ ******************************************************************************/
+
+/* 10 ticks (Watchdog timer = Timer clock / 16) */
+#define RESET_TIMEOUT	U(10)
+
+static void __dead2 rpi3_watchdog_reset(void)
+{
+	uint32_t rstc;
+
+	console_flush();
+
+	dsbsy();
+	isb();
+
+	mmio_write_32(RPI3_PM_BASE + RPI3_PM_WDOG_OFFSET,
+		      RPI3_PM_PASSWORD | RESET_TIMEOUT);
+
+	rstc = mmio_read_32(RPI3_PM_BASE + RPI3_PM_RSTC_OFFSET);
+	rstc &= ~RPI3_PM_RSTC_WRCFG_MASK;
+	rstc |= RPI3_PM_PASSWORD | RPI3_PM_RSTC_WRCFG_FULL_RESET;
+	mmio_write_32(RPI3_PM_BASE + RPI3_PM_RSTC_OFFSET, rstc);
+
+	for (;;) {
+		wfi();
+	}
+}
+
+static void __dead2 rpi3_system_reset(void)
+{
+	INFO("rpi3: PSCI_SYSTEM_RESET: Invoking watchdog reset\n");
+
+	rpi3_watchdog_reset();
+}
+
+static void __dead2 rpi3_system_off(void)
+{
+	uint32_t rsts;
+
+	INFO("rpi3: PSCI_SYSTEM_OFF: Invoking watchdog reset\n");
+
+	/*
+	 * This function doesn't actually make the Raspberry Pi turn itself off,
+	 * the hardware doesn't allow it. It simply reboots it and the RSTS
+	 * value tells the bootcode.bin firmware not to continue the regular
+	 * bootflow and to stay in a low power mode.
+	 */
+
+	rsts = mmio_read_32(RPI3_PM_BASE + RPI3_PM_RSTS_OFFSET);
+	rsts |= RPI3_PM_PASSWORD | RPI3_PM_RSTS_WRCFG_HALT;
+	mmio_write_32(RPI3_PM_BASE + RPI3_PM_RSTS_OFFSET, rsts);
+
+	rpi3_watchdog_reset();
+}
+
+/*******************************************************************************
+ * Platform handlers and setup function.
+ ******************************************************************************/
+static const plat_psci_ops_t plat_rpi3_psci_pm_ops = {
+	.cpu_standby = rpi3_cpu_standby,
+	.pwr_domain_off = rpi3_pwr_domain_off,
+	.pwr_domain_on = rpi3_pwr_domain_on,
+	.pwr_domain_on_finish = rpi3_pwr_domain_on_finish,
+	.pwr_domain_pwr_down_wfi = rpi3_pwr_down_wfi,
+	.system_off = rpi3_system_off,
+	.system_reset = rpi3_system_reset,
+	.validate_power_state = rpi3_validate_power_state,
+};
+
+int plat_setup_psci_ops(uintptr_t sec_entrypoint,
+			const plat_psci_ops_t **psci_ops)
+{
+	uintptr_t *entrypoint = (void *) PLAT_RPI3_TM_ENTRYPOINT;
+
+	*entrypoint = sec_entrypoint;
+	*psci_ops = &plat_rpi3_psci_pm_ops;
+
+	return 0;
+}