/* SPDX-License-Identifier: GPL-2.0-only */ #include #include #include #include #include #include #include static void enable_core_clocks(int cpu) { const uint32_t cpu_clocks[] = { [0] = CRC_RST_CPUG_CLR_CPU0 | CRC_RST_CPUG_CLR_DBG0 | CRC_RST_CPUG_CLR_CORE0 | CRC_RST_CPUG_CLR_CX0, [1] = CRC_RST_CPUG_CLR_CPU1 | CRC_RST_CPUG_CLR_DBG1 | CRC_RST_CPUG_CLR_CORE1 | CRC_RST_CPUG_CLR_CX1, [2] = CRC_RST_CPUG_CLR_CPU2 | CRC_RST_CPUG_CLR_DBG2 | CRC_RST_CPUG_CLR_CORE2 | CRC_RST_CPUG_CLR_CX2, [3] = CRC_RST_CPUG_CLR_CPU3 | CRC_RST_CPUG_CLR_DBG3 | CRC_RST_CPUG_CLR_CORE3 | CRC_RST_CPUG_CLR_CX3, }; assert (cpu < CONFIG_MAX_CPUS); /* Clear reset of CPU components. */ write32(CLK_RST_REG(rst_cpug_cmplx_clr), cpu_clocks[cpu]); } void cpu_prepare_startup(void *entry_64) { struct tegra_secure_boot *sb = (struct tegra_secure_boot *)TEGRA_SB_BASE; /* * T210 TRM, section 12.4.4.2: "SB_AA64_RESET_LOW_0[0:0] is used to * decide between CPU boot up in AARCH32 (=0) or AARCH64 (=1) mode. * This bit .. is sampled only during 'cold reset of CPU'. Before the * CPU is powered up, the CPU reset vector is loaded in * EVP_CPU_REST_VECTOR_0 for 32-bit boot mode .... However, the CPU * decides to boot in 32-/64-bit mode based on * SB_AA64_RESET_LOW_0[0:0]. If this bit is set (=1), the CPU boots in * 64-bit mode using SB_AA64_RESET_* as the reset address. If this bit * is clear (=0), CPU boots in 32-bit mode using EVP_CPU_RESET_VECTOR." */ write32(&sb->sb_aa64_reset_low, (uintptr_t)entry_64); setbits32(&sb->sb_aa64_reset_low, 1); write32(&sb->sb_aa64_reset_high, 0); } void start_cpu_silent(int cpu, void *entry_64) { cpu_prepare_startup(entry_64); enable_core_clocks(cpu); } void start_cpu(int cpu, void *entry_64) { printk(BIOS_DEBUG, "Starting CPU%d @ %p.\n", cpu, entry_64); start_cpu_silent(cpu, entry_64); }