/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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_dphpd(); 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); } //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; 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); // XXX Turn on the LCD power here. // FIXME: should timeout 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); // XXX Turn on the backlight power here. 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__); // Uncomment to get excessive GPIO output: // 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, };