blob: afcb00881e53202944b03539f22fa5d42324550c [file] [log] [blame]
/*
* 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/pwm.h>
#include <asm/arch/display.h>
#include <asm/arch-tegra/timer.h>
DECLARE_GLOBAL_DATA_PTR;
/* These are the stages we go throuh in enabling the LCD */
enum stage_t {
STAGE_START,
STAGE_PANEL_VDD,
STAGE_LVDS,
STAGE_BACKLIGHT_VDD,
STAGE_PWM,
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 */
/* Our LCD config, set up in handle_stage() */
static struct fdt_panel_config config;
struct fdt_disp_config *disp_config; /* Display controller config */
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_disp_config *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 type = DCACHE_OFF;
int size;
assert(disp_config);
lcd_base = (void *)disp_config->frame_buffer;
/* Make sure that we can acommodate the selected LCD */
assert(disp_config->width <= LCD_MAX_WIDTH);
assert(disp_config->height <= LCD_MAX_HEIGHT);
assert(disp_config->log2_bpp <= LCD_MAX_LOG2_BPP);
if (disp_config->width <= LCD_MAX_WIDTH
&& disp_config->height <= LCD_MAX_HEIGHT
&& disp_config->log2_bpp <= LCD_MAX_LOG2_BPP)
update_panel_size(disp_config);
size = lcd_get_size(&lcd_line_length);
/* Set up the LCD caching as requested */
if (config.cache_type & FDT_LCD_CACHE_WRITE_THROUGH)
type = DCACHE_WRITETHROUGH;
else if (config.cache_type & FDT_LCD_CACHE_WRITE_BACK)
type = DCACHE_WRITEBACK;
mmu_set_region_dcache_behaviour(disp_config->frame_buffer, size, type);
/* Enable flushing after LCD writes if requested */
lcd_set_flush_dcache(config.cache_type & FDT_LCD_CACHE_FLUSH);
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;
}
/**
* Decode the panel information from the fdt.
*
* @param blob fdt blob
* @param config structure to store fdt config into
* @return 0 if ok, -ve on error
*/
static int fdt_decode_lcd(const void *blob, struct fdt_panel_config *config)
{
int display_node;
disp_config = tegra_display_get_config();
if (!disp_config) {
debug("%s: Display controller is not configured\n", __func__);
return -1;
}
display_node = disp_config->panel_node;
if (display_node < 0) {
debug("%s: No panel configuration available\n", __func__);
return -1;
}
config->pwm_channel = pwm_request(blob, display_node, "nvidia,pwm");
if (config->pwm_channel < 0) {
debug("%s: Unable to request PWM channel\n", __func__);
return -1;
}
config->cache_type = fdtdec_get_int(blob, display_node,
"nvidia,cache-type",
FDT_LCD_CACHE_WRITE_BACK_FLUSH);
/* These GPIOs are all optional */
fdtdec_decode_gpio(blob, display_node, "nvidia,backlight-enable-gpios",
&config->backlight_en);
fdtdec_decode_gpio(blob, display_node, "nvidia,lvds-shutdown-gpios",
&config->lvds_shutdown);
fdtdec_decode_gpio(blob, display_node, "nvidia,backlight-vdd-gpios",
&config->backlight_vdd);
fdtdec_decode_gpio(blob, display_node, "nvidia,panel-vdd-gpios",
&config->panel_vdd);
return fdtdec_get_int_array(blob, display_node, "nvidia,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:
/* Initialize the Tegra display controller */
if (tegra_display_probe(gd->fdt_blob, (void *)gd->fb_base)) {
printf("%s: Failed to probe display driver\n",
__func__);
return -1;
}
/* get panel details */
if (fdt_decode_lcd(blob, &config)) {
printf("No valid 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.
*/
if (fdt_gpio_isvalid(&config.panel_vdd))
gpio_direction_output(config.panel_vdd.gpio, 0);
if (fdt_gpio_isvalid(&config.lvds_shutdown))
gpio_direction_output(config.lvds_shutdown.gpio, 0);
if (fdt_gpio_isvalid(&config.backlight_vdd))
gpio_direction_output(config.backlight_vdd.gpio, 0);
if (fdt_gpio_isvalid(&config.backlight_en))
gpio_direction_output(config.backlight_en.gpio, 0);
break;
case STAGE_PANEL_VDD:
if (fdt_gpio_isvalid(&config.panel_vdd))
gpio_direction_output(config.panel_vdd.gpio, 1);
break;
case STAGE_LVDS:
if (fdt_gpio_isvalid(&config.lvds_shutdown))
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_PWM:
/* Enable PWM at 15/16 high, 32768 Hz with divider 1 */
pinmux_set_func(PINGRP_GPU, PMUX_FUNC_PWM);
pinmux_tristate_disable(PINGRP_GPU);
pwm_enable(config.pwm_channel, 32768, 0xdf, 1);
break;
case STAGE_BACKLIGHT_EN:
if (fdt_gpio_isvalid(&config.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();
if (stage < FDT_LCD_TIMINGS)
timer_next += 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);
if (stage == STAGE_DONE)
debug("%s: LCD init complete\n", __func__);
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 (disp_config->log2_bpp != LCD_BPP) {
printf("%s: Error: LCD depth configured in FDT (%d = %dbpp)"
" must match setting of LCD_BPP (%d)\n", __func__,
disp_config->log2_bpp, disp_config->bpp, LCD_BPP);
}
}