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Diffstat (limited to 'src/mainboard/google/pit/mainboard.c')
| -rw-r--r-- | src/mainboard/google/pit/mainboard.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/src/mainboard/google/pit/mainboard.c b/src/mainboard/google/pit/mainboard.c new file mode 100644 index 0000000000..11b72c59e0 --- /dev/null +++ b/src/mainboard/google/pit/mainboard.c @@ -0,0 +1,273 @@ +/* + * 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 <console/console.h> +#include <device/device.h> +#include <device/i2c.h> +#include <drivers/ti/tps65090/tps65090.h> +#include <cbmem.h> +#include <delay.h> +#include <edid.h> +#include <vbe.h> +#include <boot/coreboot_tables.h> +#include <arch/cache.h> +#include <arch/exception.h> +#include <cpu/samsung/exynos5420/tmu.h> +#include <cpu/samsung/exynos5420/clk.h> +#include <cpu/samsung/exynos5420/cpu.h> +#include <cpu/samsung/exynos5420/gpio.h> +#include <cpu/samsung/exynos5420/power.h> +#include <cpu/samsung/exynos5420/i2c.h> +#include <cpu/samsung/exynos5420/dp-core.h> + +#include "exynos5420.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... */ + +static struct edid edid = { + .ha = 1366, + .va = 768, + .bpp = 16, +}; + +/* TODO: transplanted DP stuff, clean up once we have something that works */ +static enum exynos5_gpio_pin dp_pd_l = GPIO_Y25; /* active low */ +static enum exynos5_gpio_pin dp_rst_l = GPIO_X15; /* active low */ +static enum exynos5_gpio_pin dp_hpd = GPIO_X07; /* active high */ + +static void exynos_dp_bridge_setup(void) +{ + exynos_pinmux_config(PERIPH_ID_DPHPD, 0); + + gpio_set_value(dp_pd_l, 1); + gpio_cfg_pin(dp_pd_l, GPIO_OUTPUT); + gpio_set_pull(dp_pd_l, GPIO_PULL_NONE); + + gpio_set_value(dp_rst_l, 0); + gpio_cfg_pin(dp_rst_l, GPIO_OUTPUT); + gpio_set_pull(dp_rst_l, GPIO_PULL_NONE); + udelay(10); + gpio_set_value(dp_rst_l, 1); +} + +static void exynos_dp_bridge_init(void) +{ + /* De-assert PD (and possibly RST) to power up the bridge */ + gpio_set_value(dp_pd_l, 1); + gpio_set_value(dp_rst_l, 1); + + /* + * We need to wait for 90ms after bringing up the bridge since + * there is a phantom "high" on the HPD chip during its + * bootup. The phantom high comes within 7ms of de-asserting + * PD and persists for at least 15ms. The real high comes + * roughly 50ms after PD is de-asserted. The phantom high + * makes it hard for us to know when the NXP chip is up. + */ + udelay(90000); +} + +static int exynos_dp_hotplug(void) +{ + /* Check HPD. If it's high, we're all good. */ + return gpio_get_value(dp_hpd) ? 0 : 1; +} + +static void exynos_dp_reset(void) +{ + gpio_set_value(dp_pd_l, 0); + gpio_set_value(dp_rst_l, 0); + /* paranoid delay period (300ms) */ + udelay(300 * 1000); +} + +/* + * This delay is T3 in the LCD timing spec (defined as >200ms). We set + * this down to 60ms since that's the approximate maximum amount of time + * it'll take a bridge to start outputting LVDS data. The delay of + * >200ms is just a conservative value to avoid turning on the backlight + * when there's random LCD data on the screen. Shaving 140ms off the + * boot is an acceptable trade-off. + */ +#define LCD_T3_DELAY_MS 60 + +#define LCD_T5_DELAY_MS 10 +#define LCD_T6_DELAY_MS 10 + +static void backlight_pwm(void) +{ + /*Configure backlight PWM as a simple output high (100% brightness) */ + gpio_direction_output(GPIO_B20, 1); + udelay(LCD_T6_DELAY_MS * 1000); +} + +static void backlight_en(void) +{ + /* Configure GPIO for LCD_BL_EN */ + gpio_direction_output(GPIO_X30, 1); +} + +#define TPS69050_BUS 4 /* Pit-specific */ + +#define FET1_CTRL 0x0f +#define FET6_CTRL 0x14 + +static void lcd_vdd(void) +{ + /* Enable FET6, lcd panel */ + tps65090_fet_enable(TPS69050_BUS, FET6_CTRL); +} + +static void backlight_vdd(void) +{ + /* Enable FET1, backlight */ + tps65090_fet_enable(TPS69050_BUS, FET1_CTRL); + udelay(LCD_T5_DELAY_MS * 1000); +} + +//static struct video_info smdk5420_dp_config = { +static struct video_info dp_video_info = { + /* FIXME: fix video_info struct to use const for name */ + .name = (char *)"eDP-LVDS NXP PTN3460", + + .h_sync_polarity = 0, + .v_sync_polarity = 0, + .interlaced = 0, + + .color_space = COLOR_RGB, + .dynamic_range = VESA, + .ycbcr_coeff = COLOR_YCBCR601, + .color_depth = COLOR_8, + + .link_rate = LINK_RATE_2_70GBPS, + .lane_count = LANE_COUNT2, +}; + +/* FIXME: move some place more appropriate */ +#define EXYNOS5420_DP1_BASE 0x145b0000 +#define MAX_DP_TRIES 5 + +/* + * This function disables the USB3.0 PLL to save power + */ +static void disable_usb30_pll(void) +{ + enum exynos5_gpio_pin usb3_pll_l = GPIO_Y11; + + gpio_direction_output(usb3_pll_l, 0); +} + +/* this happens after cpu_init where exynos resources are set */ +static void mainboard_init(device_t dev) +{ + int dp_tries; + struct s5p_dp_device dp_device = { + .base = (struct exynos5_dp *)EXYNOS5420_DP1_BASE, + .video_info = &dp_video_info, + }; + void *fb_addr; + + i2c_init(TPS69050_BUS, I2C_0_SPEED, I2C_SLAVE); + i2c_init(7, I2C_0_SPEED, I2C_SLAVE); + + tmu_init(&exynos5420_tmu_info); + + /* Clock Gating all the unused IP's to save power */ + clock_gate(); + + /* Disable USB3.0 PLL to save 250mW of power */ + disable_usb30_pll(); + + fb_addr = cbmem_find(CBMEM_ID_CONSOLE); + set_vbe_mode_info_valid(&edid, (uintptr_t)(fb_addr) + 64*KiB); + + lcd_vdd(); + do { + udelay(50); + } while (!exynos_dp_hotplug()); + + exynos_dp_bridge_setup(); + for (dp_tries = 1; dp_tries <= MAX_DP_TRIES; dp_tries++) { + exynos_dp_bridge_init(); + if (exynos_dp_hotplug()) { + exynos_dp_reset(); + continue; + } + + if (dp_controller_init(&dp_device)) + continue; + + udelay(LCD_T3_DELAY_MS * 1000); + + backlight_vdd(); + backlight_pwm(); + backlight_en(); + /* if we're here, we're successful */ + break; + } + + if (dp_tries > MAX_DP_TRIES) + printk(BIOS_ERR, "%s: Failed to set up displayport\n", __func__); + + gpio_info(); +} + +static void mainboard_enable(device_t dev) +{ + dev->ops->init = &mainboard_init; + + /* set up coreboot tables */ + /* FIXME: this should happen somewhere else */ + high_tables_size = CONFIG_COREBOOT_TABLES_SIZE; + high_tables_base = CONFIG_SYS_SDRAM_BASE + + ((unsigned)CONFIG_DRAM_SIZE_MB << 20ULL) - + CONFIG_COREBOOT_TABLES_SIZE; + cbmem_init(high_tables_base, high_tables_size); + + /* set up dcache and MMU */ + /* FIXME: this should happen via resource allocator */ + exynos5420_config_l2_cache(); + mmu_init(); + mmu_config_range(0, DRAM_START, DCACHE_OFF); + mmu_config_range(DRAM_START, DRAM_SIZE, DCACHE_WRITEBACK); + mmu_config_range(DRAM_END, 4096 - DRAM_END, DCACHE_OFF); + dcache_invalidate_all(); + dcache_mmu_enable(); + + /* this is going to move, but we must have it now and we're + * not sure where */ + exception_init(); + + const unsigned epll_hz = 192000000; + const unsigned sample_rate = 48000; + const unsigned lr_frame_size = 256; + clock_epll_set_rate(epll_hz); + clock_select_i2s_clk_source(); + clock_set_i2s_clk_prescaler(epll_hz, sample_rate * lr_frame_size); + + power_enable_xclkout(); +} + +struct chip_operations mainboard_ops = { + .name = "Samsung/Google ARM Chromebook", + .enable_dev = mainboard_enable, +}; |