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rockbox/firmware/target/arm/samsung/yh920/lcd-yh920.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2004 by Linus Nielsen Feltzing
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "system.h"
#include "kernel.h"
#include "lcd.h"
/*** definitions ***/
/* LCD command codes */
#define LCD_CNTL_POWER_CONTROL 0x25
#define LCD_CNTL_VOLTAGE_SELECT 0x2b
#define LCD_CNTL_LINE_INVERT_DRIVE 0x36
#define LCD_CNTL_GRAY_SCALE_PATTERN 0x39
#define LCD_CNTL_TEMP_GRADIENT_SELECT 0x4e
#define LCD_CNTL_OSC_FREQUENCY 0x5f
#define LCD_CNTL_ON_OFF 0xae
#define LCD_CNTL_OSC_ON_OFF 0xaa
#define LCD_CNTL_OFF_MODE 0xbe
#define LCD_CNTL_REVERSE 0xa6
#define LCD_CNTL_ALL_LIGHTING 0xa4
#define LCD_CNTL_COMMON_OUTPUT_STATUS 0xc4
#define LCD_CNTL_COLUMN_ADDRESS_DIR 0xa0
#define LCD_CNTL_NLINE_ON_OFF 0xe4
#define LCD_CNTL_DISPLAY_MODE 0x66
#define LCD_CNTL_DUTY_SET 0x6d
#define LCD_CNTL_ELECTRONIC_VOLUME 0x81
#define LCD_CNTL_DATA_INPUT_DIR 0x84
#define LCD_CNTL_DISPLAY_START_LINE 0x8a
#define LCD_CNTL_AREA_SCROLL 0x10
#define LCD_CNTL_PAGE 0xb1
#define LCD_CNTL_COLUMN 0x13
#define LCD_CNTL_DATA_WRITE 0x1d
/* lcd commands */
static void lcd_send_data(unsigned byte)
{
while (LCD1_CONTROL & LCD1_BUSY_MASK); /* wait for LCD */
LCD1_DATA = byte;
}
static void lcd_send_cmd(unsigned byte)
{
while (LCD1_CONTROL & LCD1_BUSY_MASK); /* wait for LCD */
LCD1_CMD = byte;
}
static void lcd_write_reg(unsigned cmd, unsigned data)
{
lcd_send_cmd(cmd);
lcd_send_data(data);
}
static void lcd_write_reg_ex(unsigned cmd, unsigned data0, unsigned data1)
{
lcd_send_cmd(cmd);
lcd_send_data(data0);
lcd_send_data(data1);
}
/*** hardware configuration ***/
int lcd_default_contrast(void)
{
return DEFAULT_CONTRAST_SETTING;
}
void lcd_set_contrast(int val)
{
/* Keep val in acceptable hw range */
if (val < 0)
val = 0;
else if (val > 127)
val = 127;
lcd_write_reg_ex(LCD_CNTL_ELECTRONIC_VOLUME, val, -1);
}
void lcd_set_invert_display(bool yesno)
{
lcd_send_cmd(LCD_CNTL_REVERSE | (yesno?1:0));
}
/* turn the display upside down (call lcd_update() afterwards) */
void lcd_set_flip(bool yesno)
{
if (yesno)
{
lcd_send_cmd(LCD_CNTL_COLUMN_ADDRESS_DIR | 1);
lcd_send_cmd(LCD_CNTL_COMMON_OUTPUT_STATUS | 0);
lcd_write_reg_ex(LCD_CNTL_DUTY_SET, 0x20, 0);
}
else
{
lcd_send_cmd(LCD_CNTL_COLUMN_ADDRESS_DIR | 0);
lcd_send_cmd(LCD_CNTL_COMMON_OUTPUT_STATUS | 1);
lcd_write_reg_ex(LCD_CNTL_DUTY_SET, 0x20, 1);
}
}
void lcd_init_device(void)
{
#if 0
/* This is the init sequence from the yh820 OF bootloader */
unsigned long tmp;
DEV_INIT2 |= 0x400;
DEV_INIT1 &= ~0x3000;
tmp = DEV_INIT1;
DEV_INIT1 = tmp;
DEV_INIT2 &= ~0x400;
LCD1_CONTROL &= ~0x4;
udelay(15);
LCD1_CONTROL |= 0x4;
LCD1_CONTROL = 0x680;
LCD1_CONTROL = 0x684;
LCD1_CONTROL |= 0x1;
lcd_send_cmd(LCD_CNTL_RESET);
lcd_send_cmd(LCD_CNTL_DISCHARGE_ON_OFF | 0);
lcd_send_cmd(LCD_CNTL_ON_OFF | 0); /* LCD OFF */
lcd_send_cmd(LCD_CNTL_COLUMN_ADDRESS_DIR | 0); /* Normal */
lcd_send_cmd(LCD_CNTL_COMMON_OUTPUT_STATUS | 0); /* Normal */
lcd_send_cmd(LCD_CNTL_REVERSE | 0); /* Reverse OFF */
lcd_send_cmd(LCD_CNTL_ALL_LIGHTING | 0); /* Normal */
lcd_write_reg_ex(LCD_CNTL_DUTY_SET, 0x1f, 0x00);
lcd_send_cmd(LCD_CNTL_OFF_MODE | 1); /* OFF -> VCC on drivers */
lcd_write_reg(LCD_CNTL_VOLTAGE_SELECT, 0x03);
lcd_write_reg(LCD_CNTL_ELECTRONIC_VOLUME, 0x40);
lcd_write_reg(LCD_CNTL_TEMP_GRADIENT_SELECT, 0x00);
lcd_write_reg(LCD_CNTL_LINE_INVERT_DRIVE, 0x1f);
lcd_send_cmd(LCD_CNTL_NLINE_ON_OFF | 1); /* N-line ON */
lcd_write_reg(LCD_CNTL_OSC_FREQUENCY, 0x00);
lcd_send_cmd(LCD_CNTL_OSC_ON_OFF | 1); /* Oscillator ON */
lcd_write_reg(LCD_CNTL_STEPUP_CK_FREQ, 0x03);
lcd_write_reg(LCD_CNTL_POWER_CONTROL, 0x1c);
lcd_write_reg(LCD_CNTL_POWER_CONTROL, 0x1e);
lcd_write_reg(LCD_CNTL_DISPLAY_START_LINE, 0x00);
lcd_send_cmd(LCD_CNTL_DATA_INPUT_DIR | 0); /* Column mode */
lcd_send_cmd(LCD_CNTL_DISPLAY_MODE, 0); /* Greyscale mode */
lcd_write_reg(LCD_CNTL_GRAY_SCALE_PATTERN, 0x52);
lcd_send_cmd(LCD_CNTL_PARTIAL_DISPLAY_ON_OFF | 0);
lcd_write_reg(LCD_CNTL_POWER_CONTROL, 0x1f);
lcd_send_cmd(LCD_CNTL_ON_OFF | 1); /* LCD ON */
#endif
}
/*** update functions ***/
/* Performance function that works with an external buffer
note that by and bheight are in 8-pixel units! */
void lcd_blit_mono(const unsigned char *data, int x, int by, int width,
int bheight, int stride)
{
(void)data;
(void)x;
(void)by;
(void)width;
(void)bheight;
(void)stride;
#if 0
/* This is from the h100 lcd code, perhaps we can adapt */
const unsigned char *src, *src_end;
unsigned char *dst_u, *dst_l;
static unsigned char upper[LCD_WIDTH] IBSS_ATTR;
static unsigned char lower[LCD_WIDTH] IBSS_ATTR;
unsigned int byte;
by *= 2;
while (bheight--)
{
src = data;
src_end = data + width;
dst_u = upper;
dst_l = lower;
do
{
byte = *src++;
*dst_u++ = lcd_dibits[byte & 0x0F];
byte >>= 4;
*dst_l++ = lcd_dibits[byte & 0x0F];
}
while (src < src_end);
lcd_write_reg_ex(LCD_CNTL_PAGE, by++, -1);
lcd_write_reg_ex(LCD_CNTL_COLUMN, x, -1);
lcd_send_cmd(LCD_CNTL_DATA_WRITE);
lcd_write_data(upper, width);
lcd_write_reg_ex(LCD_CNTL_PAGE, by++, -1);
lcd_write_reg_ex(LCD_CNTL_COLUMN, x, -1);
lcd_send_cmd(LCD_CNTL_DATA_WRITE);
lcd_write_data(lower, width);
data += stride;
}
#endif
}
/* Helper function for lcd_grey_phase_blit(). */
/* void lcd_grey_data(unsigned char *values, unsigned char *phases, int count); */
/* Performance function that works with an external buffer
note that by and bheight are in 4-pixel units! */
void lcd_blit_grey_phase(unsigned char *values, unsigned char *phases,
int x, int by, int width, int bheight, int stride)
{
(void)values;
(void)phases;
(void)x;
(void)by;
(void)width;
(void)bheight;
(void)stride;
#if 0
/* This is from the h100 lcd code, perhaps we can adapt */
stride <<= 2; /* 4 pixels per block */
while (bheight--)
{
lcd_write_reg_ex(LCD_CNTL_PAGE, by++, -1);
lcd_write_reg_ex(LCD_CNTL_COLUMN, x, -1);
lcd_send_cmd(LCD_CNTL_DATA_WRITE);
lcd_grey_data(values, phases, width);
values += stride;
phases += stride;
}
#endif
}
/* Update a fraction of the display. */
/* void lcd_update_rect(int, int, int, int) ICODE_ATTR; */
void lcd_update_rect(int x0, int y, int width, int height)
{
const fb_data *addr;
int ymax;
int x = x0;
/* The Y coordinates have to work on even 8 pixel rows */
ymax = (y + height-1) >> 2;
y >>= 2;
if(x + width > LCD_WIDTH)
width = LCD_WIDTH - x;
if (width <= 0)
return; /* nothing left to do, 0 is harmful to lcd_write_data() */
if(ymax >= LCD_FBHEIGHT)
ymax = LCD_FBHEIGHT-1;
/* Copy specified rectange bitmap to hardware */
for (; y <= ymax; y++)
{
lcd_write_reg(LCD_CNTL_PAGE, y);
lcd_write_reg(LCD_CNTL_COLUMN, x0);
addr = &lcd_framebuffer[y][x0];
lcd_send_cmd(LCD_CNTL_DATA_WRITE);
for (x = x0; x < width; x++)
lcd_send_data(*addr++);
}
}
/* Update the display.
This must be called after all other LCD functions that change the display. */
void lcd_update(void)
{
lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);
}
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