This driver supports driving a single LCD and providing a U-Boot console on it.
Signed-off-by: Simon Glass sjg@chromium.org --- drivers/video/Makefile | 1 + drivers/video/tegra.c | 379 ++++++++++++++++++++++++++++++++++++++++++++++++ include/fdtdec.h | 1 + lib/fdtdec.c | 1 + 4 files changed, 382 insertions(+), 0 deletions(-) create mode 100644 drivers/video/tegra.c
diff --git a/drivers/video/Makefile b/drivers/video/Makefile index 6252f6a..ff043a1 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -42,6 +42,7 @@ COBJS-$(CONFIG_VIDEO_OMAP3) += omap3_dss.o videomodes.o COBJS-$(CONFIG_VIDEO_SED13806) += sed13806.o COBJS-$(CONFIG_VIDEO_SM501) += sm501.o COBJS-$(CONFIG_VIDEO_SMI_LYNXEM) += smiLynxEM.o videomodes.o +COBJS-$(CONFIG_VIDEO_TEGRA) += tegra.o COBJS-$(CONFIG_VIDEO_VCXK) += bus_vcxk.o
COBJS := $(sort $(COBJS-y)) diff --git a/drivers/video/tegra.c b/drivers/video/tegra.c new file mode 100644 index 0000000..7622d2d --- /dev/null +++ b/drivers/video/tegra.c @@ -0,0 +1,379 @@ +/* + * Copyright (c) 2011 The Chromium OS Authors. + * See file CREDITS for list of people who contributed to this + * project. + * + * 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; either version 2 of + * the License, or (at your option) any later version. + * + * 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., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <fdtdec.h> +#include <lcd.h> + +#include <asm/system.h> +#include <asm/gpio.h> + +#include <asm/arch/clock.h> +#include <asm/arch/funcmux.h> +#include <asm/arch/pinmux.h> +#include <asm/arch/pwfm.h> +#include <asm/arch/display.h> +#include <asm/arch/timer.h> + +DECLARE_GLOBAL_DATA_PTR; + +/* These are the stages we go throuh in enabling the LCD */ +enum stage_t { + STAGE_START, + STAGE_LVDS, + STAGE_BACKLIGHT_VDD, + STAGE_PWFM, + STAGE_BACKLIGHT_EN, + STAGE_DONE, +}; + +static enum stage_t stage; /* Current stage we are at */ +static unsigned long timer_next; /* Time we can move onto next stage */ +static struct fdt_lcd config; /* Our LCD config, set up in handle_stage() */ + +enum { + /* Maximum LCD size we support */ + LCD_MAX_WIDTH = 1366, + LCD_MAX_HEIGHT = 768, + LCD_MAX_LOG2_BPP = 4, /* 2^4 = 16 bpp */ +}; + +int lcd_line_length; +int lcd_color_fg; +int lcd_color_bg; + +void *lcd_base; /* Start of framebuffer memory */ +void *lcd_console_address; /* Start of console buffer */ + +short console_col; +short console_row; + +vidinfo_t panel_info = { + /* Insert a value here so that we don't end up in the BSS */ + .vl_col = -1, +}; + +char lcd_cursor_enabled; + +ushort lcd_cursor_width; +ushort lcd_cursor_height; + +#ifndef CONFIG_OF_CONTROL +#error "You must enable CONFIG_OF_CONTROL to get Tegra LCD support" +#endif + +void lcd_cursor_size(ushort width, ushort height) +{ + lcd_cursor_width = width; + lcd_cursor_height = height; +} + +void lcd_toggle_cursor(void) +{ + ushort x, y; + uchar *dest; + ushort row; + + x = console_col * lcd_cursor_width; + y = console_row * lcd_cursor_height; + dest = (uchar *)(lcd_base + y * lcd_line_length + x * (1 << LCD_BPP) / + 8); + + for (row = 0; row < lcd_cursor_height; ++row, dest += lcd_line_length) { + ushort *d = (ushort *)dest; + ushort color; + int i; + + for (i = 0; i < lcd_cursor_width; ++i) { + color = *d; + color ^= lcd_color_fg; + *d = color; + ++d; + } + } +} + +void lcd_cursor_on(void) +{ + lcd_cursor_enabled = 1; + lcd_toggle_cursor(); +} +void lcd_cursor_off(void) +{ + lcd_cursor_enabled = 0; + lcd_toggle_cursor(); +} + +char lcd_is_cursor_enabled(void) +{ + return lcd_cursor_enabled; +} + +static void update_panel_size(struct fdt_lcd *config) +{ + panel_info.vl_col = config->width; + panel_info.vl_row = config->height; + panel_info.vl_bpix = config->log2_bpp; +} + +/* + * Main init function called by lcd driver. + * Inits and then prints test pattern if required. + */ + +void lcd_ctrl_init(void *lcdbase) +{ + int line_length, size; + + /* + * The framebuffer address should be specified in the device tree. + * This FDT value should be the same as the one defined in Linux kernel; + * otherwise, it causes screen flicker. The FDT value overrides the + * framebuffer allocated at the top of memory by board_init_f(). + * + * If the framebuffer address is not defined in the FDT, falls back to + * use the address allocated by board_init_f(). + */ + if (config.frame_buffer != FDT_ADDR_T_NONE) { + gd->fb_base = config.frame_buffer; + lcd_base = (void *)(gd->fb_base); + } else { + config.frame_buffer = (u32)lcd_base; + } + + /* Make sure that we can acommodate the selected LCD */ + assert(config.width <= LCD_MAX_WIDTH); + assert(config.height <= LCD_MAX_HEIGHT); + assert(config.log2_bpp <= LCD_MAX_LOG2_BPP); + if (config.width <= LCD_MAX_WIDTH && config.height <= LCD_MAX_HEIGHT && + config.log2_bpp <= LCD_MAX_LOG2_BPP) + update_panel_size(&config); + size = lcd_get_size(&line_length); + + /* Initialize the Tegra display controller */ + if (tegra2_display_register(&config)) { + printf("%s: Failed to register with display driver\n", + __func__); + return; + } + + debug("LCD frame buffer at %p\n", lcd_base); +} + +ulong calc_fbsize(void) +{ + return (panel_info.vl_col * panel_info.vl_row * + NBITS(panel_info.vl_bpix)) / 8; +} + +void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue) +{ +} + +void tegra_lcd_early_init(const void *blob) +{ + /* + * Go with the maximum size for now. We will fix this up after + * relocation. These values are only used for memory alocation. + */ + panel_info.vl_col = LCD_MAX_WIDTH; + panel_info.vl_row = LCD_MAX_HEIGHT; + panel_info.vl_bpix = LCD_MAX_LOG2_BPP; +} + +int fdt_decode_lcd(const void *blob, struct fdt_lcd *config) +{ + int err, bpp, bit; + int lcd_node, display_node; + + display_node = fdtdec_next_compatible(gd->fdt_blob, 0, + COMPAT_NVIDIA_TEGRA20_DISPLAY); + if (display_node < 0) + return display_node; + + lcd_node = fdt_next_node(blob, display_node, NULL); + if (lcd_node < 0) + return lcd_node; + + config->width = fdtdec_get_int(blob, lcd_node, "width", -1); + config->height = fdtdec_get_int(blob, lcd_node, "height", -1); + bpp = fdtdec_get_int(blob, lcd_node, "bits-per-pixel", -1); + bit = ffs(bpp) - 1; + if (bpp == (1 << bit)) + config->log2_bpp = bit; + else + config->log2_bpp = bpp; + config->bpp = bpp; + config->pixel_clock = fdtdec_get_int(blob, lcd_node, "pixel-clock", 0); + if (!config->pixel_clock || bpp == -1 || + config->width == -1 || config->height == -1) + return -FDT_ERR_NOTFOUND; + err = fdtdec_get_int_array(blob, lcd_node, "horiz-timing", + config->horiz_timing, FDT_LCD_TIMING_COUNT); + if (!err) + err = fdtdec_get_int_array(blob, lcd_node, "vert-timing", + config->vert_timing, FDT_LCD_TIMING_COUNT); + if (err) + return err; + + config->disp = (struct disp_ctlr *)fdtdec_get_addr(blob, + display_node, "reg"); + config->pwfm = fdtdec_lookup_phandle_reg(blob, display_node, "pwfm"); + if ((fdt_addr_t)config->disp == FDT_ADDR_T_NONE || + (fdt_addr_t)config->pwfm == FDT_ADDR_T_NONE) + return -1; + config->cache_type = fdtdec_get_int(blob, display_node, "cache-type", + FDT_LCD_CACHE_WRITE_BACK_FLUSH); + config->frame_buffer = fdtdec_get_addr(blob, display_node, + "frame-buffer"); + + err |= fdtdec_decode_gpio(blob, display_node, "backlight-enable-gpio", + &config->backlight_en); + err |= fdtdec_decode_gpio(blob, display_node, "lvds-shutdown-gpio", + &config->lvds_shutdown); + fdtdec_decode_gpio(blob, display_node, "backlight-vdd-gpio", + &config->backlight_vdd); + err |= fdtdec_decode_gpio(blob, display_node, "panel-vdd-gpio", + &config->panel_vdd); + if (err) + return -FDT_ERR_NOTFOUND; + + return fdtdec_get_int_array(blob, display_node, "panel-timings", + config->panel_timings, FDT_LCD_TIMINGS); +} + +/** + * Handle the next stage of device init + */ +static int handle_stage(const void *blob) +{ + debug("%s: stage %d\n", __func__, stage); + + /* do the things for this stage */ + switch (stage) { + case STAGE_START: + /* get panel details */ + if (fdt_decode_lcd(blob, &config)) { + printf("No LCD information in device tree\n"); + return -1; + } + + /* + * It is possible that the FDT has requested that the LCD be + * disabled. We currently don't support this. It would require + * changes to U-Boot LCD subsystem to have LCD support + * compiled in but not used. An easier option might be to + * still have a frame buffer, but leave the backlight off and + * remove all mention of lcd in the stdout environment + * variable. + */ + + funcmux_select(PERIPH_ID_DISP1, FUNCMUX_DEFAULT); + + fdtdec_setup_gpio(&config.panel_vdd); + fdtdec_setup_gpio(&config.lvds_shutdown); + fdtdec_setup_gpio(&config.backlight_vdd); + fdtdec_setup_gpio(&config.backlight_en); + + /* + * TODO: If fdt includes output flag we can omit this code + * since fdtdec_setup_gpio will do it for us. + */ + gpio_direction_output(config.panel_vdd.gpio, 1); + gpio_direction_output(config.lvds_shutdown.gpio, 0); + gpio_direction_output(config.backlight_vdd.gpio, 0); + gpio_direction_output(config.backlight_en.gpio, 0); + break; + + case STAGE_LVDS: + gpio_set_value(config.lvds_shutdown.gpio, 1); + break; + + case STAGE_BACKLIGHT_VDD: + if (fdt_gpio_isvalid(&config.backlight_vdd)) + gpio_set_value(config.backlight_vdd.gpio, 1); + break; + + case STAGE_PWFM: + /* Enable PWM at 15/16 high, 32768 Hz with divider 1 */ + pinmux_set_func(PINGRP_GPU, PMUX_FUNC_PWM); + pinmux_tristate_disable(PINGRP_GPU); + pwfm_enable(config.pwfm, 32768, 0xdf, 1); + break; + + case STAGE_BACKLIGHT_EN: + gpio_set_value(config.backlight_en.gpio, 1); + break; + + case STAGE_DONE: + break; + } + + /* set up timer for next stage */ + timer_next = timer_get_us() + config.panel_timings[stage] * 1000; + + /* move to next stage */ + stage++; + return 0; +} + +int tegra_lcd_check_next_stage(const void *blob, int wait) +{ + if (stage == STAGE_DONE) + return 0; + + do { + /* wait if we need to */ + debug("%s: stage %d\n", __func__, stage); + if (stage != STAGE_START) { + int delay = timer_next - timer_get_us(); + + if (delay > 0) { + if (wait) + udelay(delay); + else + return 0; + } + } + + if (handle_stage(blob)) + return -1; + } while (wait && stage != STAGE_DONE); + return 0; +} + +void lcd_enable(void) +{ + /* + * Backlight and power init will be done separately in + * tegra_lcd_check_next_stage(), which should be called in + * board_late_init(). + * + * U-Boot code supports only colour depth, selected at compile time. + * The device tree setting should match this. Otherwise the display + * will not look right, and U-Boot may crash. + */ + if (config.log2_bpp != LCD_BPP) { + printf("%s: Error: LCD depth configured in FDT (%d = %dbpp)" + " must match setting of LCD_BPP (%d)\n", __func__, + config.log2_bpp, config.bpp, LCD_BPP); + } +} diff --git a/include/fdtdec.h b/include/fdtdec.h index f60c969..d8bc80e 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -66,6 +66,7 @@ enum fdt_compat_id { COMPAT_NVIDIA_TEGRA20_EMC_TABLE, /* Tegra2 memory timing table */ COMPAT_NVIDIA_TEGRA20_NAND, /* Tegra2 NAND controller */ COMPAT_NVIDIA_TEGRA20_KBC, /* Tegra2 Keyboard */ + COMPAT_NVIDIA_TEGRA20_DISPLAY, /* Tegra 2 Display controller */
COMPAT_COUNT, }; diff --git a/lib/fdtdec.c b/lib/fdtdec.c index f7d0c95..82dcbbd 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -44,6 +44,7 @@ static const char * const compat_names[COMPAT_COUNT] = { COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"), COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"), COMPAT(NVIDIA_TEGRA20_KBC, "nvidia,tegra20-kbc"), + COMPAT(NVIDIA_TEGRA20_DISPLAY, "nvidia,tegra20-display"), };
const char *fdtdec_get_compatible(enum fdt_compat_id id)