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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.
*
* 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/io.h>
#include <arch/stages.h>
#include <device/device.h>
#include <cbfs.h>
#include <cbmem.h>
#include <console/console.h>
#include "sdram_configs.h"
#include <soc/nvidia/tegra/i2c.h>
#include <soc/nvidia/tegra124/chip.h>
#include <soc/nvidia/tegra124/clk_rst.h>
#include <soc/nvidia/tegra124/sdram.h>
#include <soc/addressmap.h>
#include <soc/clock.h>
#include <soc/display.h>
#include <timestamp.h>
static struct clk_rst_ctlr *clk_rst = (void *)TEGRA_CLK_RST_BASE;
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);
}
static void setup_pinmux(void)
{
// Write protect.
gpio_input_pullup(GPIO(R1));
// Recovery mode.
gpio_input_pullup(GPIO(Q7));
// Lid switch.
gpio_input_pullup(GPIO(R4));
// Power switch.
gpio_input_pullup(GPIO(Q0));
// Developer mode.
gpio_input_pullup(GPIO(Q6));
// EC in RW.
gpio_input_pullup(GPIO(U4));
// SOC and TPM reset GPIO, active low.
gpio_output(GPIO(I5), 1);
// SPI1 MOSI
pinmux_set_config(PINMUX_ULPI_CLK_INDEX, PINMUX_ULPI_CLK_FUNC_SPI1 |
PINMUX_PULL_NONE |
PINMUX_INPUT_ENABLE);
// SPI1 MISO
pinmux_set_config(PINMUX_ULPI_DIR_INDEX, PINMUX_ULPI_DIR_FUNC_SPI1 |
PINMUX_PULL_NONE |
PINMUX_INPUT_ENABLE);
// SPI1 SCLK
pinmux_set_config(PINMUX_ULPI_NXT_INDEX, PINMUX_ULPI_NXT_FUNC_SPI1 |
PINMUX_PULL_NONE |
PINMUX_INPUT_ENABLE);
// SPI1 CS0
pinmux_set_config(PINMUX_ULPI_STP_INDEX, PINMUX_ULPI_STP_FUNC_SPI1 |
PINMUX_PULL_NONE |
PINMUX_INPUT_ENABLE);
// I2C3 (cam) clock.
pinmux_set_config(PINMUX_CAM_I2C_SCL_INDEX,
PINMUX_CAM_I2C_SCL_FUNC_I2C3 | PINMUX_INPUT_ENABLE);
// I2C3 (cam) data.
pinmux_set_config(PINMUX_CAM_I2C_SDA_INDEX,
PINMUX_CAM_I2C_SDA_FUNC_I2C3 | PINMUX_INPUT_ENABLE);
// switch unused pin to GPIO
gpio_set_mode(GPIO(X3), GPIO_MODE_GPIO);
gpio_set_mode(GPIO(X4), GPIO_MODE_GPIO);
gpio_set_mode(GPIO(X5), GPIO_MODE_GPIO);
gpio_set_mode(GPIO(X6), GPIO_MODE_GPIO);
gpio_set_mode(GPIO(X7), GPIO_MODE_GPIO);
gpio_set_mode(GPIO(W3), GPIO_MODE_GPIO);
}
static void configure_ec_spi_bus(void)
{
clock_configure_source(sbc1, PLLP, 5000);
}
static void configure_tpm_i2c_bus(void)
{
/*
* The TPM is on I2C3 and can theoretically run at 400 KHz but doesn't
* seem to work above around 40 KHz. It's set to run at 100 KHz in the
* kernel.
*/
clock_configure_i2c_scl_freq(i2c3, PLLP, 40);
i2c_init(2);
}
static void __attribute__((noinline)) romstage(void)
{
#if CONFIG_COLLECT_TIMESTAMPS
uint64_t romstage_start_time = timestamp_get();
#endif
configure_l2ctlr();
configure_l2actlr();
console_init();
exception_init();
sdram_init(get_sdram_config());
/* used for MMU and CBMEM setup, in MB */
u32 dram_start = (CONFIG_SYS_SDRAM_BASE >> 20);
u32 dram_end = sdram_max_addressable_mb(); /* plus one... */
u32 dram_size = dram_end - dram_start;
mmu_init();
/* Device memory below DRAM is uncached. */
mmu_config_range(0, dram_start, DCACHE_OFF);
/* SRAM is cached. Round the size up to 2MB, the LPAE page size. */
mmu_config_range(0x40000000 >> 20, 2, DCACHE_WRITEBACK);
/* DRAM is cached. */
mmu_config_range(dram_start, dram_size, DCACHE_WRITEBACK);
/* A window for DMA is uncached. */
mmu_config_range(CONFIG_DRAM_DMA_START >> 20,
CONFIG_DRAM_DMA_SIZE >> 20, DCACHE_OFF);
/* The space above DRAM is uncached. */
if (dram_end < 4096)
mmu_config_range(dram_end, 4096 - dram_end, DCACHE_OFF);
mmu_disable_range(0, 1);
dcache_mmu_enable();
/* For quality of the user experience, 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. The only thing setup_display does is manage
* 4 GPIOs, under control of the config struct members.
* In general, it is safe to enable panel power, and disable
* anything related to the backlight. If we get something wrong,
* we can easily fix it in ramstage by further GPIO manipulation,
* so we feel it is ok to do some setting at this point.
*/
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();
#if CONFIG_COLLECT_TIMESTAMPS
timestamp_init(0);
timestamp_add(TS_START_ROMSTAGE, romstage_start_time);
timestamp_add(TS_START_COPYRAM, timestamp_get());
#endif
// Enable additional peripherals we need for ROM stage.
clock_enable_clear_reset(0, CLK_H_SBC1, CLK_U_I2C3, 0, 0, 0);
setup_pinmux();
configure_ec_spi_bus();
configure_tpm_i2c_bus();
void *entry = cbfs_load_stage(CBFS_DEFAULT_MEDIA,
"fallback/coreboot_ram");
#if CONFIG_COLLECT_TIMESTAMPS
timestamp_add(TS_END_COPYRAM, timestamp_get());
#endif
stage_exit(entry);
}
/* Stub to force arm_init_caches to the top, before any stack/memory accesses */
void main(void)
{
asm volatile ("bl arm_init_caches"
::: "r0","r1","r2","r3","r4","r5","ip");
romstage();
}
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