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|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Rockbox driver for iPod LCDs
*
* Based on code from the ipodlinux project - http://ipodlinux.org/
* Adapted for Rockbox in November 2005
*
* Original file: linux/arch/armnommu/mach-ipod/fb.c
*
* Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org)
*
* 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 "cpu.h"
#include "lcd.h"
#include "kernel.h"
#include "system.h"
#include "hwcompat.h"
/* LCD command codes for HD66753 */
#define R_START_OSC 0x00
#define R_DRV_OUTPUT_CONTROL 0x01
#define R_DRV_WAVEFORM_CONTROL 0x02
#define R_POWER_CONTROL 0x03
#define R_CONTRAST_CONTROL 0x04
#define R_ENTRY_MODE 0x05
#define R_ROTATION 0x06
#define R_DISPLAY_CONTROL 0x07
#define R_CURSOR_CONTROL 0x08
#define R_HORIZONTAL_CURSOR_POS 0x0b
#define R_VERTICAL_CURSOR_POS 0x0c
#define R_1ST_SCR_DRV_POS 0x0d
#define R_2ND_SCR_DRV_POS 0x0e
#define R_RAM_WRITE_MASK 0x10
#define R_RAM_ADDR_SET 0x11
#define R_RAM_DATA 0x12
#ifdef HAVE_BACKLIGHT_INVERSION
/* The backlight makes the LCD appear negative on the 1st/2nd gen */
static bool lcd_inverted = false;
static bool lcd_backlit = false;
#if NUM_CORES > 1
/* invert_display() and the lcd_blit_* functions need to be corelocked */
static struct corelock cl IBSS_ATTR;
#endif
static void invert_display(void);
#endif
#if defined(IPOD_1G2G) || defined(IPOD_3G)
#define POWER_REG_H 0x1120 /* 1/7 Bias, 5x step-up @ clk/8 */
#else
#define POWER_REG_H 0x1200 /* 1/7 Bias, 6x step-up @ clk/32 */
#endif
#define CONTRAST_REG_H 0x400
#if defined(IPOD_1G2G)
#define DEFAULT_CONTRAST 45
#elif defined(IPOD_3G)
#define DEFAULT_CONTRAST 55
#elif defined(IPOD_MINI) || defined(IPOD_MINI2G)
#define DEFAULT_CONTRAST 42
#elif defined(IPOD_4G)
#define DEFAULT_CONTRAST 35
#endif
/* needed for flip */
static int addr_offset;
#if defined(IPOD_MINI) || defined(IPOD_MINI2G)
static int pix_offset;
void lcd_write_data_shifted(const fb_data* p_bytes, int count);
#endif
/* wait for LCD with timeout */
static inline void lcd_wait_write(void)
{
while (LCD1_CONTROL & LCD1_BUSY_MASK);
}
/* send LCD command */
static void lcd_prepare_cmd(unsigned cmd)
{
lcd_wait_write();
#ifdef IPOD_MINI2G
LCD1_CMD = cmd | 0x740000;
#else
LCD1_CMD = 0;
lcd_wait_write();
LCD1_CMD = cmd;
#endif
}
/* send LCD command and data */
static void lcd_cmd_and_data(unsigned cmd, unsigned data)
{
lcd_wait_write();
#ifdef IPOD_MINI2G
LCD1_CMD = cmd | 0x740000;
lcd_wait_write();
LCD1_CMD = data | 0x760000;
#else
LCD1_CMD = 0;
lcd_wait_write();
LCD1_CMD = cmd;
lcd_wait_write();
LCD1_DATA = data >> 8;
lcd_wait_write();
LCD1_DATA = data & 0xff;
#endif
}
/* LCD init */
void lcd_init_device(void)
{
#if (NUM_CORES > 1) && defined(HAVE_BACKLIGHT_INVERSION)
corelock_init(&cl);
#endif
#ifdef IPOD_MINI2G /* serial LCD hookup */
lcd_wait_write();
LCD1_CONTROL = 0x01730084; /* fastest setting */
#elif defined(IPOD_1G2G) || defined(IPOD_3G)
LCD1_CONTROL = (LCD1_CONTROL & 0x0002) | 0x0084;
/* fastest setting, keep backlight bit */
#else
LCD1_CONTROL = 0x0084; /* fastest setting */
#endif
lcd_cmd_and_data(R_DRV_WAVEFORM_CONTROL, 0x48);
/* C waveform, no EOR, 9 lines inversion */
lcd_cmd_and_data(R_POWER_CONTROL, POWER_REG_H | 0xc);
lcd_cmd_and_data(R_DISPLAY_CONTROL, 0x0019);
lcd_set_contrast(DEFAULT_CONTRAST);
#ifdef HAVE_BACKLIGHT_INVERSION
invert_display();
#endif
lcd_set_flip(false);
lcd_cmd_and_data(R_ENTRY_MODE, 0x0000);
}
/*** hardware configuration ***/
int lcd_default_contrast(void)
{
return DEFAULT_CONTRAST;
}
/* Rockbox stores the contrast as 0..63 - we add 64 to it */
void lcd_set_contrast(int val)
{
if (val < 0) val = 0;
else if (val > 63) val = 63;
lcd_cmd_and_data(R_CONTRAST_CONTROL, CONTRAST_REG_H | (val + 64));
}
#ifdef HAVE_BACKLIGHT_INVERSION
static void invert_display(void)
{
static bool last_invert = false;
bool new_invert = lcd_inverted ^ lcd_backlit;
if (new_invert != last_invert)
{
int oldlevel = disable_irq_save();
#if NUM_CORES > 1
corelock_lock(&cl);
lcd_cmd_and_data(R_DISPLAY_CONTROL, new_invert? 0x0027 : 0x0019);
corelock_unlock(&cl);
#else
lcd_cmd_and_data(R_DISPLAY_CONTROL, new_invert? 0x0027 : 0x0019);
#endif
restore_irq(oldlevel);
last_invert = new_invert;
}
}
void lcd_set_invert_display(bool yesno)
{
lcd_inverted = yesno;
invert_display();
}
void lcd_set_backlight_inversion(bool yesno)
{
lcd_backlit = yesno;
invert_display();
}
#else
void lcd_set_invert_display(bool yesno)
{
lcd_cmd_and_data(R_DISPLAY_CONTROL, yesno ? 0x0027 : 0x0019);
}
#endif
/* turn the display upside down (call lcd_update() afterwards) */
void lcd_set_flip(bool yesno)
{
#if defined(IPOD_MINI) || defined(IPOD_MINI2G)
if (yesno)
{ /* 168x112, inverse COM order */
lcd_cmd_and_data(R_DRV_OUTPUT_CONTROL, 0x020d);
lcd_cmd_and_data(R_1ST_SCR_DRV_POS, 0x8316); /* 22..131 */
addr_offset = (22 << 5) | (20 - 4);
pix_offset = -2;
}
else
{ /* 168x112, inverse SEG order */
lcd_cmd_and_data(R_DRV_OUTPUT_CONTROL, 0x010d);
lcd_cmd_and_data(R_1ST_SCR_DRV_POS, 0x6d00); /* 0..109 */
addr_offset = 20;
pix_offset = 0;
}
#else
if (yesno)
{ /* 168x128, inverse SEG & COM order */
lcd_cmd_and_data(R_DRV_OUTPUT_CONTROL, 0x030f);
lcd_cmd_and_data(R_1ST_SCR_DRV_POS, 0x8304); /* 4..131 */
addr_offset = (4 << 5) | (20 - 1);
}
else
{ /* 168x128 */
lcd_cmd_and_data(R_DRV_OUTPUT_CONTROL, 0x000f);
lcd_cmd_and_data(R_1ST_SCR_DRV_POS, 0x7f00); /* 0..127 */
addr_offset = 20;
}
#endif
}
#ifdef HAVE_LCD_ENABLE
void lcd_enable(bool on)
{
if (on)
{
lcd_cmd_and_data(R_START_OSC, 1); /* start oscillation */
sleep(HZ/10); /* wait 10ms */
lcd_cmd_and_data(R_POWER_CONTROL, POWER_REG_H); /*clear standby mode */
lcd_cmd_and_data(R_POWER_CONTROL, POWER_REG_H | 0xc);
/* enable opamp & booster */
}
else
{
lcd_cmd_and_data(R_POWER_CONTROL, POWER_REG_H);
/* switch off opamp & booster */
lcd_cmd_and_data(R_POWER_CONTROL, POWER_REG_H | 0x1);
/* enter standby mode */
}
}
#endif /* HAVE_LCD_ENABLE */
/*** update functions ***/
/* Helper function. */
void lcd_mono_data(const unsigned char *data, int count);
/* Performance function that works with an external buffer
note that x, bwidtht and stride are in 8-pixel units! */
void lcd_blit_mono(const unsigned char *data, int bx, int y, int bwidth,
int height, int stride)
{
#if (NUM_CORES > 1) && defined(HAVE_BACKLIGHT_INVERSION)
corelock_lock(&cl);
#endif
while (height--)
{
lcd_cmd_and_data(R_RAM_ADDR_SET, (y++ << 5) + addr_offset - bx);
lcd_prepare_cmd(R_RAM_DATA);
lcd_mono_data(data, bwidth);
data += stride;
}
#if (NUM_CORES > 1) && defined(HAVE_BACKLIGHT_INVERSION)
corelock_unlock(&cl);
#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 bx and bwidth are in 8-pixel units! */
void lcd_blit_grey_phase(unsigned char *values, unsigned char *phases,
int bx, int y, int bwidth, int height, int stride)
{
#if (NUM_CORES > 1) && defined(HAVE_BACKLIGHT_INVERSION)
corelock_lock(&cl);
#endif
while (height--)
{
lcd_cmd_and_data(R_RAM_ADDR_SET, (y++ << 5) + addr_offset - bx);
lcd_prepare_cmd(R_RAM_DATA);
lcd_grey_data(values, phases, bwidth);
values += stride;
phases += stride;
}
#if (NUM_CORES > 1) && defined(HAVE_BACKLIGHT_INVERSION)
corelock_unlock(&cl);
#endif
}
void lcd_update_rect(int x, int y, int width, int height)
{
int xmax, ymax;
if (x + width > LCD_WIDTH)
width = LCD_WIDTH - x;
if (width <= 0)
return;
ymax = y + height - 1;
if (ymax >= LCD_HEIGHT)
ymax = LCD_HEIGHT - 1;
#if defined(IPOD_MINI) || defined(IPOD_MINI2G)
x += pix_offset;
#endif
/* writing is done in 16-bit units (8 pixels) */
xmax = (x + width - 1) >> 3;
x >>= 3;
width = xmax - x + 1;
for (; y <= ymax; y++)
{
lcd_cmd_and_data(R_RAM_ADDR_SET, (y << 5) + addr_offset - x);
lcd_prepare_cmd(R_RAM_DATA);
#if defined(IPOD_MINI) || defined(IPOD_MINI2G)
if (pix_offset == -2)
lcd_write_data_shifted(&lcd_framebuffer[y][2*x], width);
else
#endif
lcd_write_data(&lcd_framebuffer[y][2*x], width);
}
}
/* Update the display. */
void lcd_update(void)
{
lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);
}
#ifdef HAVE_LCD_SHUTDOWN
/* LCD powerdown */
void lcd_shutdown(void)
{
lcd_cmd_and_data(R_POWER_CONTROL, POWER_REG_H | 0x00); /* Turn off op amp power */
lcd_cmd_and_data(R_POWER_CONTROL, POWER_REG_H | 0x02); /* Put LCD driver in standby */
}
#endif
|
