274 lines
8.2 KiB
C
274 lines
8.2 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2004 by Linus Nielsen Feltzing
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "system.h"
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#include "kernel.h"
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#include "lcd.h"
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/*** definitions ***/
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/* LCD command codes */
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#define LCD_CNTL_POWER_CONTROL 0x25
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#define LCD_CNTL_VOLTAGE_SELECT 0x2b
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#define LCD_CNTL_LINE_INVERT_DRIVE 0x36
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#define LCD_CNTL_GRAY_SCALE_PATTERN 0x39
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#define LCD_CNTL_TEMP_GRADIENT_SELECT 0x4e
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#define LCD_CNTL_OSC_FREQUENCY 0x5f
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#define LCD_CNTL_ON_OFF 0xae
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#define LCD_CNTL_OSC_ON_OFF 0xaa
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#define LCD_CNTL_OFF_MODE 0xbe
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#define LCD_CNTL_REVERSE 0xa6
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#define LCD_CNTL_ALL_LIGHTING 0xa4
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#define LCD_CNTL_COMMON_OUTPUT_STATUS 0xc4
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#define LCD_CNTL_COLUMN_ADDRESS_DIR 0xa0
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#define LCD_CNTL_NLINE_ON_OFF 0xe4
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#define LCD_CNTL_DISPLAY_MODE 0x66
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#define LCD_CNTL_DUTY_SET 0x6d
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#define LCD_CNTL_ELECTRONIC_VOLUME 0x81
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#define LCD_CNTL_DATA_INPUT_DIR 0x84
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#define LCD_CNTL_DISPLAY_START_LINE 0x8a
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#define LCD_CNTL_AREA_SCROLL 0x10
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#define LCD_CNTL_PAGE 0xb1
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#define LCD_CNTL_COLUMN 0x13
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#define LCD_CNTL_DATA_WRITE 0x1d
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/*** shared semi-private declarations ***/
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extern const unsigned char lcd_dibits[16] ICONST_ATTR;
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/* lcd commands */
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static void lcd_send_data(unsigned byte)
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{
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while (LCD1_CONTROL & LCD1_BUSY_MASK); /* wait for LCD */
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LCD1_DATA = byte;
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}
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static void lcd_send_cmd(unsigned byte)
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{
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while (LCD1_CONTROL & LCD1_BUSY_MASK); /* wait for LCD */
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LCD1_CMD = byte;
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}
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static void lcd_write_reg(unsigned cmd, unsigned data)
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{
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lcd_send_cmd(cmd);
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lcd_send_data(data);
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}
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static void lcd_write_reg_ex(unsigned cmd, unsigned data0, unsigned data1)
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{
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lcd_send_cmd(cmd);
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lcd_send_data(data0);
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lcd_send_data(data1);
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}
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/*** hardware configuration ***/
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int lcd_default_contrast(void)
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{
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return DEFAULT_CONTRAST_SETTING;
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}
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void lcd_set_contrast(int val)
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{
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/* Keep val in acceptable hw range */
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if (val < 0)
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val = 0;
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else if (val > 127)
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val = 127;
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lcd_write_reg_ex(LCD_CNTL_ELECTRONIC_VOLUME, val, -1);
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}
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void lcd_set_invert_display(bool yesno)
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{
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lcd_send_cmd(LCD_CNTL_REVERSE | (yesno?1:0));
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}
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/* turn the display upside down (call lcd_update() afterwards) */
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void lcd_set_flip(bool yesno)
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{
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if (yesno)
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{
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lcd_send_cmd(LCD_CNTL_COLUMN_ADDRESS_DIR | 1);
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lcd_send_cmd(LCD_CNTL_COMMON_OUTPUT_STATUS | 1);
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lcd_write_reg_ex(LCD_CNTL_DUTY_SET, 0x1f, 1);
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}
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else
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{
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lcd_send_cmd(LCD_CNTL_COLUMN_ADDRESS_DIR | 0);
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lcd_send_cmd(LCD_CNTL_COMMON_OUTPUT_STATUS | 0);
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lcd_write_reg_ex(LCD_CNTL_DUTY_SET, 0x1f, 0);
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}
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}
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void lcd_init_device(void)
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{
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#if 0
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/* This is the init sequence from the yh820 OF bootloader */
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unsigned long tmp;
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DEV_INIT2 |= 0x400;
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DEV_INIT1 &= ~0x3000;
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tmp = DEV_INIT1;
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DEV_INIT1 = tmp;
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DEV_INIT2 &= ~0x400;
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LCD1_CONTROL &= ~0x4;
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udelay(15);
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LCD1_CONTROL |= 0x4;
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LCD1_CONTROL = 0x680;
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LCD1_CONTROL = 0x684;
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LCD1_CONTROL |= 0x1;
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lcd_send_cmd(LCD_CNTL_RESET);
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lcd_send_cmd(LCD_CNTL_DISCHARGE_ON_OFF | 0);
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lcd_send_cmd(LCD_CNTL_ON_OFF | 0); /* LCD OFF */
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lcd_send_cmd(LCD_CNTL_COLUMN_ADDRESS_DIR | 0); /* Normal */
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lcd_send_cmd(LCD_CNTL_COMMON_OUTPUT_STATUS | 0); /* Normal */
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lcd_send_cmd(LCD_CNTL_REVERSE | 0); /* Reverse OFF */
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lcd_send_cmd(LCD_CNTL_ALL_LIGHTING | 0); /* Normal */
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lcd_write_reg_ex(LCD_CNTL_DUTY_SET, 0x1f, 0x00);
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lcd_send_cmd(LCD_CNTL_OFF_MODE | 1); /* OFF -> VCC on drivers */
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lcd_write_reg(LCD_CNTL_VOLTAGE_SELECT, 0x03);
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lcd_write_reg(LCD_CNTL_ELECTRONIC_VOLUME, 0x40);
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lcd_write_reg(LCD_CNTL_TEMP_GRADIENT_SELECT, 0x00);
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lcd_write_reg(LCD_CNTL_LINE_INVERT_DRIVE, 0x1f);
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lcd_send_cmd(LCD_CNTL_NLINE_ON_OFF | 1); /* N-line ON */
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lcd_write_reg(LCD_CNTL_OSC_FREQUENCY, 0x00);
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lcd_send_cmd(LCD_CNTL_OSC_ON_OFF | 1); /* Oscillator ON */
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lcd_write_reg(LCD_CNTL_STEPUP_CK_FREQ, 0x03);
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lcd_write_reg(LCD_CNTL_POWER_CONTROL, 0x1c);
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lcd_write_reg(LCD_CNTL_POWER_CONTROL, 0x1e);
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lcd_write_reg(LCD_CNTL_DISPLAY_START_LINE, 0x00);
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lcd_send_cmd(LCD_CNTL_DATA_INPUT_DIR | 0); /* Column mode */
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lcd_send_cmd(LCD_CNTL_DISPLAY_MODE, 0); /* Greyscale mode */
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lcd_write_reg(LCD_CNTL_GRAY_SCALE_PATTERN, 0x52);
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lcd_send_cmd(LCD_CNTL_PARTIAL_DISPLAY_ON_OFF | 0);
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lcd_write_reg(LCD_CNTL_POWER_CONTROL, 0x1f);
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lcd_send_cmd(LCD_CNTL_ON_OFF | 1); /* LCD ON */
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#endif
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}
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/*** update functions ***/
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/* Performance function that works with an external buffer
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note that by and bheight are in 8-pixel units! */
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void lcd_blit_mono(const unsigned char *data, int x, int by, int width,
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int bheight, int stride)
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{
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const unsigned char *src, *src_end;
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unsigned char *dst_u, *dst_l;
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static unsigned char upper[LCD_WIDTH] IBSS_ATTR;
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static unsigned char lower[LCD_WIDTH] IBSS_ATTR;
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unsigned int byte;
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by *= 2;
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while (bheight--)
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{
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src = data;
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src_end = data + width;
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dst_u = upper;
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dst_l = lower;
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do
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{
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byte = *src++;
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*dst_u++ = lcd_dibits[byte & 0x0F];
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byte >>= 4;
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*dst_l++ = lcd_dibits[byte & 0x0F];
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}
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while (src < src_end);
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lcd_write_reg_ex(LCD_CNTL_PAGE, by++, -1);
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lcd_write_reg_ex(LCD_CNTL_COLUMN, x, -1);
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lcd_send_cmd(LCD_CNTL_DATA_WRITE);
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lcd_write_data(upper, width);
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lcd_write_reg_ex(LCD_CNTL_PAGE, by++, -1);
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lcd_write_reg_ex(LCD_CNTL_COLUMN, x, -1);
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lcd_send_cmd(LCD_CNTL_DATA_WRITE);
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lcd_write_data(lower, width);
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data += stride;
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}
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}
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/* Helper function for lcd_grey_phase_blit(). */
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void lcd_grey_data(unsigned char *values, unsigned char *phases, int count);
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/* Performance function that works with an external buffer
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note that by and bheight are in 4-pixel units! */
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void lcd_blit_grey_phase(unsigned char *values, unsigned char *phases,
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int x, int by, int width, int bheight, int stride)
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{
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stride <<= 2; /* 4 pixels per block */
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while (bheight--)
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{
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lcd_write_reg_ex(LCD_CNTL_PAGE, by++, -1);
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lcd_write_reg_ex(LCD_CNTL_COLUMN, x, -1);
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lcd_send_cmd(LCD_CNTL_DATA_WRITE);
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lcd_grey_data(values, phases, width);
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values += stride;
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phases += stride;
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}
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}
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/* Update a fraction of the display. */
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/* void lcd_update_rect(int, int, int, int) ICODE_ATTR; */
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void lcd_update_rect(int x, int y, int width, int height)
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{
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const fb_data *addr;
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int ymax;
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/* The Y coordinates have to work on even 8 pixel rows */
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ymax = (y + height-1) >> 2;
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y >>= 2;
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if(x + width > LCD_WIDTH)
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width = LCD_WIDTH - x;
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if (width <= 0)
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return; /* nothing left to do, 0 is harmful to lcd_write_data() */
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if(ymax >= LCD_FBHEIGHT)
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ymax = LCD_FBHEIGHT-1;
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/* Copy specified rectange bitmap to hardware */
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for (; y <= ymax; y++)
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{
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lcd_write_reg(LCD_CNTL_PAGE, y);
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lcd_write_reg(LCD_CNTL_COLUMN, x);
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addr = FBADDR(x,y);
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lcd_send_cmd(LCD_CNTL_DATA_WRITE);
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lcd_write_data(addr, width);
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}
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}
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/* Update the display.
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This must be called after all other LCD functions that change the display. */
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void lcd_update(void)
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{
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lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);
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}
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