amlogic: g12a: Add support for the S905X2 (G12A) platform
Introduce the preliminary support for the Amlogic S905X2 (G12A) SoC.
This port is a minimal implementation of BL31 capable of booting
mainline U-Boot and Linux. Tested on a SEI510 board.
Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Change-Id: Ife958f10e815a4530292c45446adb71239f3367f
diff --git a/plat/amlogic/g12a/g12a_pm.c b/plat/amlogic/g12a/g12a_pm.c
new file mode 100644
index 0000000..c9fe3e9
--- /dev/null
+++ b/plat/amlogic/g12a/g12a_pm.c
@@ -0,0 +1,215 @@
+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch_helpers.h>
+#include <assert.h>
+#include <common/debug.h>
+#include <drivers/arm/gicv2.h>
+#include <drivers/console.h>
+#include <errno.h>
+#include <lib/mmio.h>
+#include <lib/psci/psci.h>
+#include <plat/common/platform.h>
+#include <platform_def.h>
+
+#include "aml_private.h"
+
+#define SCPI_POWER_ON 0
+#define SCPI_POWER_RETENTION 1
+#define SCPI_POWER_OFF 3
+
+#define SCPI_SYSTEM_SHUTDOWN 0
+#define SCPI_SYSTEM_REBOOT 1
+
+static uintptr_t g12a_sec_entrypoint;
+static volatile uint32_t g12a_cpu0_go;
+
+static void g12a_pm_set_reset_addr(u_register_t mpidr, uint64_t value)
+{
+ unsigned int core = plat_calc_core_pos(mpidr);
+ uintptr_t cpu_mailbox_addr = AML_PSCI_MAILBOX_BASE + (core << 4);
+
+ mmio_write_64(cpu_mailbox_addr, value);
+}
+
+static void g12a_pm_reset(u_register_t mpidr)
+{
+ unsigned int core = plat_calc_core_pos(mpidr);
+ uintptr_t cpu_mailbox_addr = AML_PSCI_MAILBOX_BASE + (core << 4) + 8;
+
+ mmio_write_32(cpu_mailbox_addr, 0);
+}
+
+static void __dead2 g12a_system_reset(void)
+{
+ INFO("BL31: PSCI_SYSTEM_RESET\n");
+
+ u_register_t mpidr = read_mpidr_el1();
+ uint32_t status = mmio_read_32(AML_AO_RTI_STATUS_REG3);
+ int ret;
+
+ NOTICE("BL31: Reboot reason: 0x%x\n", status);
+
+ status &= 0xFFFF0FF0;
+
+ console_flush();
+
+ mmio_write_32(AML_AO_RTI_STATUS_REG3, status);
+
+ ret = aml_scpi_sys_power_state(SCPI_SYSTEM_REBOOT);
+
+ if (ret != 0) {
+ ERROR("BL31: PSCI_SYSTEM_RESET: SCP error: %i\n", ret);
+ panic();
+ }
+
+ g12a_pm_reset(mpidr);
+
+ wfi();
+
+ ERROR("BL31: PSCI_SYSTEM_RESET: Operation not handled\n");
+ panic();
+}
+
+static void __dead2 g12a_system_off(void)
+{
+ INFO("BL31: PSCI_SYSTEM_OFF\n");
+
+ u_register_t mpidr = read_mpidr_el1();
+ int ret;
+
+ ret = aml_scpi_sys_power_state(SCPI_SYSTEM_SHUTDOWN);
+
+ if (ret != 0) {
+ ERROR("BL31: PSCI_SYSTEM_OFF: SCP error %i\n", ret);
+ panic();
+ }
+
+ g12a_pm_set_reset_addr(mpidr, 0);
+ g12a_pm_reset(mpidr);
+
+ wfi();
+
+ ERROR("BL31: PSCI_SYSTEM_OFF: Operation not handled\n");
+ panic();
+}
+
+static int32_t g12a_pwr_domain_on(u_register_t mpidr)
+{
+ unsigned int core = plat_calc_core_pos(mpidr);
+
+ /* CPU0 can't be turned OFF */
+ if (core == AML_PRIMARY_CPU) {
+ VERBOSE("BL31: Releasing CPU0 from wait loop...\n");
+
+ g12a_cpu0_go = 1;
+ flush_dcache_range((uintptr_t)&g12a_cpu0_go,
+ sizeof(g12a_cpu0_go));
+ dsb();
+ isb();
+
+ sev();
+
+ return PSCI_E_SUCCESS;
+ }
+
+ g12a_pm_set_reset_addr(mpidr, g12a_sec_entrypoint);
+ aml_scpi_set_css_power_state(mpidr,
+ SCPI_POWER_ON, SCPI_POWER_ON, SCPI_POWER_ON);
+ dmbsy();
+ sev();
+
+ return PSCI_E_SUCCESS;
+}
+
+static void g12a_pwr_domain_on_finish(const psci_power_state_t *target_state)
+{
+ unsigned int core = plat_calc_core_pos(read_mpidr_el1());
+
+ assert(target_state->pwr_domain_state[MPIDR_AFFLVL0] ==
+ PLAT_LOCAL_STATE_OFF);
+
+ if (core == AML_PRIMARY_CPU) {
+ g12a_cpu0_go = 0;
+ flush_dcache_range((uintptr_t)&g12a_cpu0_go,
+ sizeof(g12a_cpu0_go));
+ dsb();
+ isb();
+ }
+
+ gicv2_pcpu_distif_init();
+ gicv2_cpuif_enable();
+}
+
+static void g12a_pwr_domain_off(const psci_power_state_t *target_state)
+{
+ u_register_t mpidr = read_mpidr_el1();
+ unsigned int core = plat_calc_core_pos(mpidr);
+
+ gicv2_cpuif_disable();
+
+ /* CPU0 can't be turned OFF */
+ if (core == AML_PRIMARY_CPU)
+ return;
+
+ aml_scpi_set_css_power_state(mpidr,
+ SCPI_POWER_OFF, SCPI_POWER_ON,
+ SCPI_POWER_ON);
+}
+
+static void __dead2 g12a_pwr_domain_pwr_down_wfi(const psci_power_state_t
+ *target_state)
+{
+ u_register_t mpidr = read_mpidr_el1();
+ unsigned int core = plat_calc_core_pos(mpidr);
+
+ /* CPU0 can't be turned OFF, emulate it with a WFE loop */
+ if (core == AML_PRIMARY_CPU) {
+ VERBOSE("BL31: CPU0 entering wait loop...\n");
+
+ while (g12a_cpu0_go == 0)
+ wfe();
+
+ VERBOSE("BL31: CPU0 resumed.\n");
+
+ /*
+ * Because setting CPU0's warm reset entrypoint through PSCI
+ * mailbox and/or mmio mapped RVBAR (0xda834650) does not seem
+ * to work, jump to it manually.
+ * In order to avoid an assert, MMU has to be disabled.
+ */
+ disable_mmu_el3();
+ ((void(*)(void))g12a_sec_entrypoint)();
+ }
+
+ dsbsy();
+ g12a_pm_set_reset_addr(mpidr, 0);
+ g12a_pm_reset(mpidr);
+
+ for (;;)
+ wfi();
+}
+
+/*******************************************************************************
+ * Platform handlers and setup function.
+ ******************************************************************************/
+static const plat_psci_ops_t g12a_ops = {
+ .pwr_domain_on = g12a_pwr_domain_on,
+ .pwr_domain_on_finish = g12a_pwr_domain_on_finish,
+ .pwr_domain_off = g12a_pwr_domain_off,
+ .pwr_domain_pwr_down_wfi = g12a_pwr_domain_pwr_down_wfi,
+ .system_off = g12a_system_off,
+ .system_reset = g12a_system_reset
+};
+
+int plat_setup_psci_ops(uintptr_t sec_entrypoint,
+ const plat_psci_ops_t **psci_ops)
+{
+ g12a_sec_entrypoint = sec_entrypoint;
+ *psci_ops = &g12a_ops;
+ g12a_cpu0_go = 0;
+ return 0;
+}