tegra: Add SOC support for display/lcd
Add support for the LCD peripheral at the Tegra2 SOC level. A separate
LCD driver will use this functionality to configure the display.
Signed-off-by: Mayuresh Kulkarni <mkulkarni@nvidia.com>
Mayuresh Kulkarni:
- changes to remove bitfields and clean up for submission
Signed-off-by: Simon Glass <sjg@chromium.org>
Simon Glass:
- simplify code, move clock control into here, clean-up
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/arch/arm/include/asm/arch-tegra20/display.h b/arch/arm/include/asm/arch-tegra20/display.h
new file mode 100644
index 0000000..c870959
--- /dev/null
+++ b/arch/arm/include/asm/arch-tegra20/display.h
@@ -0,0 +1,152 @@
+/*
+ * (C) Copyright 2010
+ * NVIDIA Corporation <www.nvidia.com>
+ *
+ * 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
+ */
+
+#ifndef __ASM_ARCH_TEGRA_DISPLAY_H
+#define __ASM_ARCH_TEGRA_DISPLAY_H
+
+#include <asm/arch/dc.h>
+#include <fdtdec.h>
+
+/* This holds information about a window which can be displayed */
+struct disp_ctl_win {
+ enum win_color_depth_id fmt; /* Color depth/format */
+ unsigned bpp; /* Bits per pixel */
+ phys_addr_t phys_addr; /* Physical address in memory */
+ unsigned x; /* Horizontal address offset (bytes) */
+ unsigned y; /* Veritical address offset (bytes) */
+ unsigned w; /* Width of source window */
+ unsigned h; /* Height of source window */
+ unsigned stride; /* Number of bytes per line */
+ unsigned out_x; /* Left edge of output window (col) */
+ unsigned out_y; /* Top edge of output window (row) */
+ unsigned out_w; /* Width of output window in pixels */
+ unsigned out_h; /* Height of output window in pixels */
+};
+
+#define FDT_LCD_TIMINGS 4
+
+enum {
+ FDT_LCD_TIMING_REF_TO_SYNC,
+ FDT_LCD_TIMING_SYNC_WIDTH,
+ FDT_LCD_TIMING_BACK_PORCH,
+ FDT_LCD_TIMING_FRONT_PORCH,
+
+ FDT_LCD_TIMING_COUNT,
+};
+
+enum lcd_cache_t {
+ FDT_LCD_CACHE_OFF = 0,
+ FDT_LCD_CACHE_WRITE_THROUGH = 1 << 0,
+ FDT_LCD_CACHE_WRITE_BACK = 1 << 1,
+ FDT_LCD_CACHE_FLUSH = 1 << 2,
+ FDT_LCD_CACHE_WRITE_BACK_FLUSH = FDT_LCD_CACHE_WRITE_BACK |
+ FDT_LCD_CACHE_FLUSH,
+};
+
+/* Information about the display controller */
+struct fdt_disp_config {
+ int valid; /* config is valid */
+ int width; /* width in pixels */
+ int height; /* height in pixels */
+ int bpp; /* number of bits per pixel */
+
+ /*
+ * log2 of number of bpp, in general, unless it bpp is 24 in which
+ * case this field holds 24 also! This is a U-Boot thing.
+ */
+ int log2_bpp;
+ struct disp_ctlr *disp; /* Display controller to use */
+ fdt_addr_t frame_buffer; /* Address of frame buffer */
+ unsigned pixel_clock; /* Pixel clock in Hz */
+ uint horiz_timing[FDT_LCD_TIMING_COUNT]; /* Horizontal timing */
+ uint vert_timing[FDT_LCD_TIMING_COUNT]; /* Vertical timing */
+ int panel_node; /* node offset of panel information */
+};
+
+/* Information about the LCD panel */
+struct fdt_panel_config {
+ int pwm_channel; /* PWM channel to use for backlight */
+ enum lcd_cache_t cache_type;
+
+ struct fdt_gpio_state backlight_en; /* GPIO for backlight enable */
+ struct fdt_gpio_state lvds_shutdown; /* GPIO for lvds shutdown */
+ struct fdt_gpio_state backlight_vdd; /* GPIO for backlight vdd */
+ struct fdt_gpio_state panel_vdd; /* GPIO for panel vdd */
+ /*
+ * Panel required timings
+ * Timing 1: delay between panel_vdd-rise and data-rise
+ * Timing 2: delay between data-rise and backlight_vdd-rise
+ * Timing 3: delay between backlight_vdd and pwm-rise
+ * Timing 4: delay between pwm-rise and backlight_en-rise
+ */
+ uint panel_timings[FDT_LCD_TIMINGS];
+};
+
+/**
+ * Register a new display based on device tree configuration.
+ *
+ * The frame buffer can be positioned by U-Boot or overriden by the fdt.
+ * You should pass in the U-Boot address here, and check the contents of
+ * struct fdt_disp_config to see what was actually chosen.
+ *
+ * @param blob Device tree blob
+ * @param default_lcd_base Default address of LCD frame buffer
+ * @return 0 if ok, -1 on error (unsupported bits per pixel)
+ */
+int tegra_display_probe(const void *blob, void *default_lcd_base);
+
+/**
+ * Return the current display configuration
+ *
+ * @return pointer to display configuration, or NULL if there is no valid
+ * config
+ */
+struct fdt_disp_config *tegra_display_get_config(void);
+
+/**
+ * Perform the next stage of the LCD init if it is time to do so.
+ *
+ * LCD init can be time-consuming because of the number of delays we need
+ * while waiting for the backlight power supply, etc. This function can
+ * be called at various times during U-Boot operation to advance the
+ * initialization of the LCD to the next stage if sufficient time has
+ * passed since the last stage. It keeps track of what stage it is up to
+ * and the time that it is permitted to move to the next stage.
+ *
+ * The final call should have wait=1 to complete the init.
+ *
+ * @param blob fdt blob containing LCD information
+ * @param wait 1 to wait until all init is complete, and then return
+ * 0 to return immediately, potentially doing nothing if it is
+ * not yet time for the next init.
+ */
+int tegra_lcd_check_next_stage(const void *blob, int wait);
+
+/**
+ * Set up the maximum LCD size so we can size the frame buffer.
+ *
+ * @param blob fdt blob containing LCD information
+ */
+void tegra_lcd_early_init(const void *blob);
+
+#endif /*__ASM_ARCH_TEGRA_DISPLAY_H*/