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/*
* This file is part of the coreboot project.
*
* Copyright 2013 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <arch/cache.h>
#include <arch/cpu.h>
#include <arch/exception.h>
#include <arch/stages.h>
#include <device/device.h>
#include <cbfs.h>
#include <cbmem.h>
#include <console/console.h>
#include "soc/nvidia/tegra124/chip.h"
#include <soc/display.h>
// Convenient shorthand (in MB)
#define DRAM_START (CONFIG_SYS_SDRAM_BASE >> 20)
#define DRAM_SIZE CONFIG_DRAM_SIZE_MB
#define DRAM_END (DRAM_START + DRAM_SIZE) /* plus one... */
enum {
L2CTLR_ECC_PARITY = 0x1 << 21,
L2CTLR_TAG_RAM_LATENCY_MASK = 0x7 << 6,
L2CTLR_TAG_RAM_LATENCY_CYCLES_3 = 2 << 6,
L2CTLR_DATA_RAM_LATENCY_MASK = 0x7 << 0,
L2CTLR_DATA_RAM_LATENCY_CYCLES_3 = 2 << 0
};
enum {
L2ACTLR_FORCE_L2_LOGIC_CLOCK_ENABLE_ACTIVE = 0x1 << 27,
L2ACTLR_ENABLE_HAZARD_DETECT_TIMEOUT = 0x1 << 7,
L2ACTLR_DISABLE_CLEAN_EVICT_PUSH_EXTERNAL = 0x1 << 3
};
/* Configures L2 Control Register to use 3 cycles for DATA/TAG RAM latency. */
static void configure_l2ctlr(void)
{
uint32_t val;
val = read_l2ctlr();
val &= ~(L2CTLR_DATA_RAM_LATENCY_MASK | L2CTLR_TAG_RAM_LATENCY_MASK);
val |= (L2CTLR_DATA_RAM_LATENCY_CYCLES_3 | L2CTLR_TAG_RAM_LATENCY_CYCLES_3 |
L2CTLR_ECC_PARITY);
write_l2ctlr(val);
}
/* Configures L2 Auxiliary Control Register for Cortex A15. */
static void configure_l2actlr(void)
{
uint32_t val;
val = read_l2actlr();
val |= (L2ACTLR_DISABLE_CLEAN_EVICT_PUSH_EXTERNAL |
L2ACTLR_ENABLE_HAZARD_DETECT_TIMEOUT |
L2ACTLR_FORCE_L2_LOGIC_CLOCK_ENABLE_ACTIVE);
write_l2actlr(val);
}
void main(void)
{
// Globally disable MMU, caches and branch prediction (these should
// already be disabled by default on reset).
uint32_t sctlr = read_sctlr();
sctlr &= ~(SCTLR_M | SCTLR_C | SCTLR_Z | SCTLR_I);
write_sctlr(sctlr);
arm_invalidate_caches();
// Renable icache and branch prediction.
sctlr = read_sctlr();
sctlr |= SCTLR_Z | SCTLR_I;
write_sctlr(sctlr);
configure_l2ctlr();
configure_l2actlr();
mmu_init();
mmu_config_range(0, DRAM_START, DCACHE_OFF);
mmu_config_range(DRAM_START, DRAM_SIZE, DCACHE_WRITEBACK);
mmu_config_range(CONFIG_DRAM_DMA_START >> 20,
CONFIG_DRAM_DMA_SIZE >> 20, DCACHE_OFF);
mmu_config_range(DRAM_END, 4096 - DRAM_END, DCACHE_OFF);
mmu_disable_range(0, 1);
dcache_invalidate_all();
dcache_mmu_enable();
exception_init();
/* for quality of the user interface, it's important to get
* the video going ASAP. Because there are long delays in some
* of the powerup steps, we do some very early setup here in
* romstage. We don't do this in the bootblock because video
* setup is finicky and subject to change; hence, we do it as
* early as we can in the RW stage, but never in the RO stage.
*/
const struct device *soc = dev_find_slot(DEVICE_PATH_CPU_CLUSTER, 0);
printk(BIOS_SPEW, "s%s: soc is %p\n", __func__, soc);
if (soc && soc->chip_info) {
const struct soc_nvidia_tegra124_config *config =
soc->chip_info;
setup_display((struct soc_nvidia_tegra124_config *)config);
}
cbmem_initialize_empty();
void *entry = cbfs_load_stage(CBFS_DEFAULT_MEDIA,
"fallback/coreboot_ram");
stage_exit(entry);
}
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