--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
+/*
+ * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
+ */
+
+#include <config.h>
+#include <common.h>
+#include <asm/armv7.h>
+#include <asm/gic.h>
+#include <asm/io.h>
+#include <asm/psci.h>
+#include <asm/secure.h>
+
+#define BOOT_API_A7_CORE0_MAGIC_NUMBER 0xCA7FACE0
+#define BOOT_API_A7_CORE1_MAGIC_NUMBER 0xCA7FACE1
+
+#define MPIDR_AFF0 GENMASK(7, 0)
+
+#define RCC_MP_GRSTCSETR (STM32_RCC_BASE + 0x0404)
+#define RCC_MP_GRSTCSETR_MPUP1RST BIT(5)
+#define RCC_MP_GRSTCSETR_MPUP0RST BIT(4)
+#define RCC_MP_GRSTCSETR_MPSYSRST BIT(0)
+
+#define STM32MP1_PSCI_NR_CPUS 2
+#if STM32MP1_PSCI_NR_CPUS > CONFIG_ARMV7_PSCI_NR_CPUS
+#error "invalid value for CONFIG_ARMV7_PSCI_NR_CPUS"
+#endif
+
+u8 psci_state[STM32MP1_PSCI_NR_CPUS] __secure_data = {
+ PSCI_AFFINITY_LEVEL_ON,
+ PSCI_AFFINITY_LEVEL_OFF};
+
+void __secure psci_set_state(int cpu, u8 state)
+{
+ psci_state[cpu] = state;
+ dsb();
+ isb();
+}
+
+static u32 __secure stm32mp_get_gicd_base_address(void)
+{
+ u32 periphbase;
+
+ /* get the GIC base address from the CBAR register */
+ asm("mrc p15, 4, %0, c15, c0, 0\n" : "=r" (periphbase));
+
+ return (periphbase & CBAR_MASK) + GIC_DIST_OFFSET;
+}
+
+static void __secure stm32mp_smp_kick_all_cpus(void)
+{
+ u32 gic_dist_addr;
+
+ gic_dist_addr = stm32mp_get_gicd_base_address();
+
+ /* kick all CPUs (except this one) by writing to GICD_SGIR */
+ writel(1U << 24, gic_dist_addr + GICD_SGIR);
+}
+
+void __secure psci_arch_cpu_entry(void)
+{
+ u32 cpu = psci_get_cpu_id();
+
+ psci_set_state(cpu, PSCI_AFFINITY_LEVEL_ON);
+}
+
+int __secure psci_features(u32 function_id, u32 psci_fid)
+{
+ switch (psci_fid) {
+ case ARM_PSCI_0_2_FN_PSCI_VERSION:
+ case ARM_PSCI_0_2_FN_CPU_OFF:
+ case ARM_PSCI_0_2_FN_CPU_ON:
+ case ARM_PSCI_0_2_FN_AFFINITY_INFO:
+ case ARM_PSCI_0_2_FN_MIGRATE_INFO_TYPE:
+ case ARM_PSCI_0_2_FN_SYSTEM_OFF:
+ case ARM_PSCI_0_2_FN_SYSTEM_RESET:
+ return 0x0;
+ }
+ return ARM_PSCI_RET_NI;
+}
+
+unsigned int __secure psci_version(u32 function_id)
+{
+ return ARM_PSCI_VER_1_0;
+}
+
+int __secure psci_affinity_info(u32 function_id, u32 target_affinity,
+ u32 lowest_affinity_level)
+{
+ u32 cpu = target_affinity & MPIDR_AFF0;
+
+ if (lowest_affinity_level > 0)
+ return ARM_PSCI_RET_INVAL;
+
+ if (target_affinity & ~MPIDR_AFF0)
+ return ARM_PSCI_RET_INVAL;
+
+ if (cpu >= STM32MP1_PSCI_NR_CPUS)
+ return ARM_PSCI_RET_INVAL;
+
+ return psci_state[cpu];
+}
+
+int __secure psci_migrate_info_type(u32 function_id)
+{
+ /* Trusted OS is either not present or does not require migration */
+ return 2;
+}
+
+int __secure psci_cpu_on(u32 function_id, u32 target_cpu, u32 pc,
+ u32 context_id)
+{
+ u32 cpu = target_cpu & MPIDR_AFF0;
+
+ if (target_cpu & ~MPIDR_AFF0)
+ return ARM_PSCI_RET_INVAL;
+
+ if (cpu >= STM32MP1_PSCI_NR_CPUS)
+ return ARM_PSCI_RET_INVAL;
+
+ if (psci_state[cpu] == PSCI_AFFINITY_LEVEL_ON)
+ return ARM_PSCI_RET_ALREADY_ON;
+
+ /* store target PC and context id*/
+ psci_save(cpu, pc, context_id);
+
+ /* write entrypoint in backup RAM register */
+ writel((u32)&psci_cpu_entry, TAMP_BACKUP_BRANCH_ADDRESS);
+ psci_set_state(cpu, PSCI_AFFINITY_LEVEL_ON_PENDING);
+
+ /* write magic number in backup register */
+ if (cpu == 0x01)
+ writel(BOOT_API_A7_CORE1_MAGIC_NUMBER,
+ TAMP_BACKUP_MAGIC_NUMBER);
+ else
+ writel(BOOT_API_A7_CORE0_MAGIC_NUMBER,
+ TAMP_BACKUP_MAGIC_NUMBER);
+
+ stm32mp_smp_kick_all_cpus();
+
+ return ARM_PSCI_RET_SUCCESS;
+}
+
+int __secure psci_cpu_off(u32 function_id)
+{
+ u32 cpu;
+
+ cpu = psci_get_cpu_id();
+
+ psci_cpu_off_common();
+ psci_set_state(cpu, PSCI_AFFINITY_LEVEL_OFF);
+
+ /* reset core: wfi is managed by BootRom */
+ if (cpu == 0x01)
+ writel(RCC_MP_GRSTCSETR_MPUP1RST, RCC_MP_GRSTCSETR);
+ else
+ writel(RCC_MP_GRSTCSETR_MPUP0RST, RCC_MP_GRSTCSETR);
+
+ /* just waiting reset */
+ while (1)
+ wfi();
+}
+
+void __secure psci_system_reset(u32 function_id)
+{
+ /* System reset */
+ writel(RCC_MP_GRSTCSETR_MPSYSRST, RCC_MP_GRSTCSETR);
+ /* just waiting reset */
+ while (1)
+ wfi();
+}
+
+void __secure psci_system_off(u32 function_id)
+{
+ /* System Off is not managed, waiting user power off
+ * TODO: handle I2C write in PMIC Main Control register bit 0 = SWOFF
+ */
+ while (1)
+ wfi();
+}
projects / u-boot / commitdiff