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/*
* This file is part of the coreboot project.
*
* Copyright 2014 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <device/mmio.h>
#include <assert.h>
#include <console/console.h>
#include <soc/addressmap.h>
#include <soc/clk_rst.h>
#include <soc/cpu.h>
#include <soc/secure_boot.h>
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);
setbits_le32(&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);
}
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