Ronald G. Minnich (rminnich@gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/3055
-gerrit
commit 4051d017e50efad2ecc1718d7172b200cea854b0 Author: Ronald G. Minnich rminnich@gmail.com Date: Tue Apr 9 14:39:34 2013 -0700
GOOGLE/SNOW: add edp support to ramstage
Add basic edp support to the ramstage. Not working.
Change-Id: I15086e03417edca7426c214e67b51719d8ed9341 Signed-off-by: Ronald G. Minnich rminnich@gmail.com --- src/mainboard/google/snow/ramstage.c | 203 ++++++++++++++++++++++++++++++++++- 1 file changed, 200 insertions(+), 3 deletions(-)
diff --git a/src/mainboard/google/snow/ramstage.c b/src/mainboard/google/snow/ramstage.c index 9081629..1739707 100644 --- a/src/mainboard/google/snow/ramstage.c +++ b/src/mainboard/google/snow/ramstage.c @@ -18,13 +18,20 @@ */
#include <console/console.h> +#include <device/device.h> +#include <device/i2c.h> /* FIXME: for backlight FET enable */ #include <cbmem.h> +#include <delay.h> +#include <arch/cache.h> #include <arch/exception.h> +#include <arch/gpio.h> #include <cpu/samsung/exynos5250/clk.h> #include <cpu/samsung/exynos5250/cpu.h> +#include <cpu/samsung/exynos5250/gpio.h> #include <cpu/samsung/exynos5250/power.h>
-#include <arch/cache.h> +#include <cpu/samsung/exynos5-common/s5p-dp-core.h> +
/* convenient shorthand (in MB) */ #define DRAM_START (CONFIG_SYS_SDRAM_BASE >> 20) @@ -35,7 +42,8 @@ void hardwaremain(int boot_complete); void main(void) { console_init(); - printk(BIOS_INFO, "hello from ramstage; now with deluxe exception handling.\n"); + printk(BIOS_INFO, + "hello from ramstage; now with deluxe exception handling.\n");
/* set up coreboot tables */ high_tables_size = CONFIG_COREBOOT_TABLES_SIZE; @@ -54,7 +62,8 @@ void main(void) dcache_invalidate_all(); dcache_mmu_enable();
- /* this is going to move, but we must have it now and we're not sure where */ + /* this is going to move, but we must have it now and we're + * not sure where */ exception_init();
const unsigned epll_hz = 192000000; @@ -68,3 +77,191 @@ void main(void)
hardwaremain(0); } + +/* 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, EXYNOS_GPIO_OUTPUT); + gpio_set_pull(dp_pd_l, EXYNOS_GPIO_PULL_NONE); + + gpio_set_value(dp_rst_l, 0); + gpio_cfg_pin(dp_rst_l, EXYNOS_GPIO_OUTPUT); + gpio_set_pull(dp_rst_l, EXYNOS_GPIO_PULL_NONE); + udelay(10); + gpio_set_value(dp_rst_l, 1); + + udelay(90000); /* FIXME: this might be unnecessary */ +} + +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); /* FIXME: this might be unnecessary */ +} + +static int exynos_dp_hotplug(void) +{ + /* Check HPD. If it's high, we're all good. */ + if (gpio_get_value(dp_hpd)) + return 0; + return -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); +} + +#define LCD_T5_DELAY_MS 10 +#define LCD_T6_DELAY_MS 10 + +static void snow_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 snow_backlight_en(void) +{ + /* * Configure GPIO for LCD_BL_EN */ + gpio_direction_output(GPIO_X30, 1); +} + +#define TPS69050_BUS 4 /* Snow-specific */ + +#define TPS69050_ADDR 0x48 +#define FET1_CTRL 0x0f +#define FET6_CTRL 0x14 + +static void snow_lcd_vdd(void) +{ + uint8_t val = 0xbb; + printk(BIOS_DEBUG, "%s: attempting to enable FET6\n", __func__); + i2c_set_bus_num(TPS69050_BUS); + i2c_read(TPS69050_ADDR, FET6_CTRL, 1, &val, sizeof(val)); + printk(BIOS_DEBUG, "%s: FET6_CTRL before: 0x%02x\n", __func__, val); + val |= 1; + i2c_write(TPS69050_ADDR, FET6_CTRL, 1, &val, sizeof(val)); + + i2c_read(TPS69050_ADDR, FET6_CTRL, 1, &val, sizeof(val)); + printk(BIOS_DEBUG, "%s: FET6_CTRL after: 0x%02x\n", __func__, val); +// return board_ldo_enable(6); /* Enable FET6, lcd panel */ +} + +static void snow_backlight_vdd(void) +{ + uint8_t val = 0xbb; +// return board_ldo_enable(1); /* Enable FET1, backlight */ + /* FIXME: implement more paranoid tps65090EXYNOS5250_DP1_ADDR + * fet routine + */ +// ret = tps65090_fet_enable(1); + printk(BIOS_DEBUG, "%s: attempting to enable FET1\n", __func__); + i2c_set_bus_num(TPS69050_BUS); + i2c_read(TPS69050_ADDR, FET1_CTRL, 1, &val, sizeof(val)); + printk(BIOS_DEBUG, "%s: FET1_CTRL before: 0x%02x\n", __func__, val); + val |= 1; + i2c_write(TPS69050_ADDR, FET1_CTRL, 1, &val, sizeof(val)); + udelay(LCD_T5_DELAY_MS * 1000); + + i2c_read(TPS69050_ADDR, FET1_CTRL, 1, &val, sizeof(val)); + printk(BIOS_DEBUG, "%s: FET1_CTRL after: 0x%02x\n", __func__, val); +} + +//static struct video_info smdk5250_dp_config = { +static struct video_info snow_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 EXYNOS5250_DP1_BASE 0x145b0000 +#define SNOW_MAX_DP_TRIES 5 + +static void mainboard_init(device_t dev) +{ + int dp_tries; + unsigned int wait_ms; + struct s5p_dp_device dp_device = { + .base = (struct exynos5_dp *)EXYNOS5250_DP1_BASE, + .video_info = &snow_dp_video_info, + }; + + /* this happens after cpu_init where exynos resources are set */ + /* Set the i2c register address base so i2c works before FDT */ + + /* FIXME: fix the braindead i2c crap leftover from u-boot */ + i2c_set_early_reg(0x12ca0000); + i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); + + snow_lcd_vdd(); + exynos_dp_bridge_setup(); + for (dp_tries = 1; dp_tries <= SNOW_MAX_DP_TRIES; dp_tries++) { + if (wait_ms) { + udelay(wait_ms); + wait_ms = 0; + } + + exynos_dp_bridge_init(); + if (exynos_dp_hotplug()) { + exynos_dp_reset(); + continue; + } + + if (dp_controller_init(&dp_device, &wait_ms)) + continue; + + snow_backlight_vdd(); + snow_backlight_pwm(); + snow_backlight_en(); + /* if we're here, we're successful */ + break; + } + + if (dp_tries > SNOW_MAX_DP_TRIES) + printk(BIOS_ERR, "%s: Failed to set up displayport\n", __func__); +} + +static void mainboard_enable(device_t dev) +{ + dev->ops->init = &mainboard_init; +} + +struct chip_operations mainboard_ops = { + .name = "Samsung/Google ARM Chromebook", + .enable_dev = mainboard_enable, +};
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Ronald G. Minnich