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rockbox/firmware/target/arm/as3525/sansa-fuze/lcd-fuze.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Dave Chapman
*
* LCD driver for the Sansa Fuze - controller unknown
*
* 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 "file.h"
#include "debug.h"
#include "system.h"
#include "clock-target.h"
/* The controller is unknown, but some registers appear to be the same as the
HD66789R */
#define R_ENTRY_MODE 0x03
#define R_RAM_ADDR_SET 0x21
#define R_WRITE_DATA_2_GRAM 0x22
#define R_ENTRY_MODE_HORZ 0x7030
#define R_ENTRY_MODE_VERT 0x7038
static unsigned lcd_yuv_options = 0;
static bool display_on = false; /* is the display turned on? */
static bool display_flipped = false;
static int xoffset = 20; /* needed for flip */
/* we need to write a red pixel for correct button reads
* (see lcd_button_support()),but that must not happen while the lcd is updating
* so block lcd_button_support the during updates */
static bool lcd_busy = false;
static inline void lcd_delay(int x)
{
do {
asm volatile ("nop\n");
} while (x--);
}
static void as3525_dbop_init(void)
{
CGU_DBOP = (1<<3) | AS3525_DBOP_DIV;
DBOP_TIMPOL_01 = 0xe167e167;
DBOP_TIMPOL_23 = 0xe167006e;
/* short count: 16 | output data width: 16 | readstrobe line */
DBOP_CTRL = (1<<18|1<<12|1<<3);
GPIOB_AFSEL = 0xfc;
GPIOC_AFSEL = 0xff;
DBOP_TIMPOL_23 = 0x6000e;
/* short count: 16|enable write|output data width: 16|read strobe line */
DBOP_CTRL = (1<<18|1<<16|1<<12|1<<3);
DBOP_TIMPOL_01 = 0x6e167;
DBOP_TIMPOL_23 = 0xa167e06f;
/* TODO: The OF calls some other functions here, but maybe not important */
}
static void lcd_write_value16(unsigned short value)
{
DBOP_CTRL &= ~(1<<14|1<<13);
lcd_delay(10);
DBOP_DOUT16 = value;
while ((DBOP_STAT & (1<<10)) == 0);
}
static void lcd_write_cmd(int cmd)
{
/* Write register */
DBOP_TIMPOL_23 = 0xa167006e;
lcd_write_value16(cmd);
/* Wait for fifo to empty */
while ((DBOP_STAT & (1<<10)) == 0);
/* This loop is unique to the Fuze */
lcd_delay(4);
DBOP_TIMPOL_23 = 0xa167e06f;
}
void lcd_write_data(const fb_data* p_bytes, int count)
{
const long *data;
if ((int)p_bytes & 0x3)
{ /* need to do a single 16bit write beforehand if the address is
* not word aligned*/
lcd_write_value16(*p_bytes);
count--;p_bytes++;
}
/* from here, 32bit transfers are save */
/* set it to transfer 4*(outputwidth) units at a time,
* if bit 12 is set it only does 2 halfwords though */
DBOP_CTRL |= (1<<13|1<<14);
lcd_delay(10);
data = (long*)p_bytes;
while (count > 1)
{
DBOP_DOUT32 = *data++;
count -= 2;
/* Wait if push fifo is full */
while ((DBOP_STAT & (1<<6)) != 0);
}
/* While push fifo is not empty */
while ((DBOP_STAT & (1<<10)) == 0);
/* due to the 32bit alignment requirement or uneven count,
* we possibly need to do a 16bit transfer at the end also */
if (count > 0)
lcd_write_value16(*(unsigned short*)data);
}
static void lcd_write_reg(int reg, int value)
{
unsigned short data = value;
lcd_write_cmd(reg);
lcd_write_value16(data);
}
/* turn the display upside down (call lcd_update() afterwards) */
void lcd_set_flip(bool yesno)
{
display_flipped = yesno;
xoffset = yesno ? 0 : 20; /* TODO: Implement flipped mode */
/* TODO */
}
static void _display_on(void)
{
/* Initialise in the same way as the original firmare */
lcd_write_reg(0x07, 0);
lcd_write_reg(0x13, 0);
lcd_write_reg(0x11, 0x3704);
lcd_write_reg(0x14, 0x1a1b);
lcd_write_reg(0x10, 0x3860);
lcd_write_reg(0x13, 0x40);
lcd_write_reg(0x13, 0x60);
lcd_write_reg(0x13, 0x70);
lcd_write_reg(0x01, 277);
lcd_write_reg(0x02, (7<<8));
lcd_write_reg(R_ENTRY_MODE, R_ENTRY_MODE_HORZ);
lcd_write_reg(0x08, 0x01);
lcd_write_reg(0x0b, (1<<10));
lcd_write_reg(0x0c, 0);
lcd_write_reg(0x30, 0x40);
lcd_write_reg(0x31, 0x0687);
lcd_write_reg(0x32, 0x0306);
lcd_write_reg(0x33, 0x104);
lcd_write_reg(0x34, 0x0585);
lcd_write_reg(0x35, 255+66);
lcd_write_reg(0x36, 0x0687+128);
lcd_write_reg(0x37, 259);
lcd_write_reg(0x38, 0);
lcd_write_reg(0x39, 0);
lcd_write_reg(0x42, (LCD_WIDTH - 1));
lcd_write_reg(0x43, 0);
lcd_write_reg(0x44, (LCD_WIDTH - 1));
lcd_write_reg(0x45, 0);
lcd_write_reg(0x46, (((LCD_WIDTH - 1) + xoffset) << 8) | xoffset);
lcd_write_reg(0x47, (LCD_HEIGHT - 1));
lcd_write_reg(0x48, 0x0);
lcd_write_reg(0x07, 0x11);
lcd_write_reg(0x07, 0x17);
display_on = true; /* must be done before calling lcd_update() */
lcd_update();
}
#if defined(HAVE_LCD_ENABLE)
void lcd_enable(bool on)
{
if (display_on == on)
return; /* nothing to do */
if(on)
{
lcd_write_reg(0, 1);
lcd_write_reg(0x10, 0);
lcd_write_reg(0x11, 0x3704);
lcd_write_reg(0x14, 0x1a1b);
lcd_write_reg(0x10, 0x3860);
lcd_write_reg(0x13, 0x40);
lcd_write_reg(0x13, 0x60);
lcd_write_reg(0x13, 112);
lcd_write_reg(0x07, 0x11);
lcd_write_reg(0x07, 0x17);
display_on = true;
lcd_update(); /* Resync display */
lcd_activation_call_hook();
sleep(0);
}
else
{
lcd_write_reg(0x07, 0x22);
lcd_write_reg(0x07, 0);
lcd_write_reg(0x10, 1);
display_on = false;
}
}
#endif
#if defined(HAVE_LCD_ENABLE) || defined(HAVE_LCD_SLEEP)
bool lcd_active(void)
{
return display_on;
}
#endif
/*** update functions ***/
/* Set horizontal window addresses */
static void lcd_window_x(int xmin, int xmax)
{
xmin += xoffset;
xmax += xoffset;
lcd_write_reg(0x46, (xmax << 8) | xmin);
lcd_write_reg(0x20, xmin);
}
/* Set vertical window addresses */
static void lcd_window_y(int ymin, int ymax)
{
lcd_write_reg(0x47, ymax);
lcd_write_reg(0x48, ymin);
lcd_write_reg(0x21, ymin);
}
void lcd_yuv_set_options(unsigned options)
{
lcd_yuv_options = options;
}
/* Line write helper function for lcd_yuv_blit. Write two lines of yuv420. */
extern void lcd_write_yuv420_lines(unsigned char const * const src[3],
int width,
int stride);
extern void lcd_write_yuv420_lines_odither(unsigned char const * const src[3],
int width,
int stride,
int x_screen, /* To align dither */
int y_screen); /* pattern */
/* Performance function to blit a YUV bitmap directly to the LCD */
void lcd_blit_yuv(unsigned char * const src[3],
int src_x, int src_y, int stride,
int x, int y, int width, int height)
{
unsigned char const * yuv_src[3];
off_t z;
lcd_busy = true;
lcd_write_reg(R_ENTRY_MODE, R_ENTRY_MODE_VERT);
/* Sorry, but width and height must be >= 2 or else */
width &= ~1;
height >>= 1;
z = stride*src_y;
yuv_src[0] = src[0] + z + src_x;
yuv_src[1] = src[1] + (z >> 2) + (src_x >> 1);
yuv_src[2] = src[2] + (yuv_src[1] - src[1]);
lcd_window_x(x, x + width - 1);
if (lcd_yuv_options & LCD_YUV_DITHER)
{
do
{
lcd_window_y(y, y + 1);
/* Start write to GRAM */
lcd_write_cmd(R_WRITE_DATA_2_GRAM);
lcd_write_yuv420_lines_odither(yuv_src, width, stride, x, y);
yuv_src[0] += stride << 1; /* Skip down two luma lines */
yuv_src[1] += stride >> 1; /* Skip down one chroma line */
yuv_src[2] += stride >> 1;
y += 2;
}
while (--height > 0);
}
else
{
do
{
lcd_window_y(y, y + 1);
/* Start write to GRAM */
lcd_write_cmd(R_WRITE_DATA_2_GRAM);
lcd_write_yuv420_lines(yuv_src, width, stride);
yuv_src[0] += stride << 1; /* Skip down two luma lines */
yuv_src[1] += stride >> 1; /* Skip down one chroma line */
yuv_src[2] += stride >> 1;
y += 2;
}
while (--height > 0);
}
lcd_busy = false;
}
void lcd_init_device()
{
as3525_dbop_init();
GPIOA_DIR |= (1<<5|1<<4|1<<3);
GPIOA_PIN(5) = 0;
GPIOA_PIN(3) = (1<<3);
GPIOA_PIN(4) = 0;
GPIOA_PIN(5) = (1<<5);
_display_on();
}
/* Update the display.
This must be called after all other LCD functions that change the display. */
void lcd_update(void)
{
if (!display_on)
return;
lcd_write_reg(R_ENTRY_MODE, R_ENTRY_MODE_HORZ);
lcd_busy = true;
lcd_window_x(0, LCD_WIDTH - 1);
lcd_window_y(0, LCD_HEIGHT - 1);
/* Start write to GRAM */
lcd_write_cmd(R_WRITE_DATA_2_GRAM);
/* Write data */
lcd_write_data((unsigned short *)lcd_framebuffer, LCD_WIDTH*LCD_HEIGHT);
lcd_busy = false;
}
/* Update a fraction of the display. */
void lcd_update_rect(int x, int y, int width, int height)
{
int xmax, ymax;
const fb_data *ptr;
if (!display_on)
return;
xmax = x + width;
if (xmax >= LCD_WIDTH)
xmax = LCD_WIDTH - 1; /* Clip right */
if (x < 0)
x = 0; /* Clip left */
if (x >= xmax)
return; /* nothing left to do */
width = xmax - x + 1; /* Fix width */
ymax = y + height;
if (ymax >= LCD_HEIGHT)
ymax = LCD_HEIGHT - 1; /* Clip bottom */
if (y < 0)
y = 0; /* Clip top */
if (y >= ymax)
return; /* nothing left to do */
lcd_write_reg(R_ENTRY_MODE, R_ENTRY_MODE_HORZ);
lcd_busy = true;
lcd_window_x(x, xmax);
lcd_window_y(y, ymax);
/* Start write to GRAM */
lcd_write_cmd(R_WRITE_DATA_2_GRAM);
ptr = &lcd_framebuffer[y][x];
do
{
lcd_write_data(ptr, width);
ptr += LCD_WIDTH;
}
while (++y <= ymax);
lcd_busy = false;
}
/* writes one read pixel outside the visible area, needed for correct dbop reads */
bool lcd_button_support(void)
{
fb_data data = 0xf<<12;
if (lcd_busy)
return false;
lcd_write_reg(R_ENTRY_MODE, R_ENTRY_MODE_HORZ);
/* Set start position and window */
lcd_window_x(-1, 0);
lcd_window_y(-1, 0);
lcd_write_cmd(R_WRITE_DATA_2_GRAM);
lcd_write_value16(data);
return true;
}
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