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/*
* (C) Copyright 2006
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* 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 <lcd.h>
#include <mpc5xxx.h>
#ifdef CONFIG_LCD
#define SWAPPED_LCD
/*
* The name of the device used for communication
* with the PSoC.
*/
#define PSOC_PSC MPC5XXX_PSC2
#define PSOC_BAUD 500000UL
#define RTS_ASSERT 1
#define RTS_NEGATE 0
#define CTS_ASSERT 1
#define CTS_NEGATE 0
/*
* Dimensions in pixels
*/
#define LCD_WIDTH 160
#define LCD_HEIGHT 100
/*
* Dimensions in bytes
*/
#define LCD_BUF_SIZE ((LCD_WIDTH*LCD_HEIGHT)>>3)
#if LCD_BPP != LCD_MONOCHROME
#error "MCC200 support only monochrome displays (1 bpp)!"
#endif
#define PSOC_RETRIES 10 /* each of PSOC_WAIT_TIME */
#define PSOC_WAIT_TIME 10 /* usec */
DECLARE_GLOBAL_DATA_PTR;
/*
* LCD information
*/
vidinfo_t panel_info = {
LCD_WIDTH, LCD_HEIGHT, LCD_BPP
};
int lcd_line_length;
int lcd_color_fg;
int lcd_color_bg;
/*
* Frame buffer memory information
*/
void *lcd_base; /* Start of framebuffer memory */
void *lcd_console_address; /* Start of console buffer */
short console_col = 0;
short console_row = 0;
/*
* The device we use to communicate with PSoC
*/
int serial_inited = 0;
/*
* Exported functions
*/
void lcd_initcolregs (void);
void lcd_ctrl_init (void *lcdbase);
void lcd_enable (void);
/*
* Imported functions to support the PSoC protocol
*/
extern int serial_init_dev (unsigned long dev_base);
extern void serial_setrts_dev (unsigned long dev_base, int s);
extern int serial_getcts_dev (unsigned long dev_base);
extern void serial_putc_raw_dev(unsigned long dev_base, const char c);
/*
* Just stubs for our driver, needed for compiling compabilty with
* the common LCD driver code.
*/
void lcd_initcolregs (void)
{
}
void lcd_ctrl_init (void *lcdbase)
{
}
/*
* Function sends the contents of the frame-buffer to the LCD
*/
void lcd_enable (void)
{
int i, retries, fb_size;
if (!serial_inited) {
unsigned long baud;
baud = gd->baudrate;
gd->baudrate = PSOC_BAUD;
serial_init_dev(PSOC_PSC);
gd->baudrate = baud;
serial_setrts_dev (PSOC_PSC, RTS_ASSERT);
serial_inited = 1;
}
/*
* Implement PSoC communication protocol:
* 1. Assert RTS, wait CTS assertion
* 2. Transmit data
* 3. Negate RTS, wait CTS negation
*/
/* 1 */
serial_setrts_dev (PSOC_PSC, RTS_ASSERT);
for (retries = PSOC_RETRIES; retries; retries--) {
if (serial_getcts_dev(PSOC_PSC) == CTS_ASSERT)
break;
udelay (PSOC_WAIT_TIME);
}
if (!retries) {
printf ("%s Error: PSoC doesn't respond on "
"RTS ASSERT\n", __FUNCTION__);
}
/* 2 */
fb_size = panel_info.vl_row * (panel_info.vl_col >> 3);
#if !defined(SWAPPED_LCD)
for (i=0; i<fb_size; i++) {
serial_putc_raw_dev (PSOC_PSC, ((char *)lcd_base)[i]);
}
#else
{
int x, y, pwidth;
char *p = (char *)lcd_base;
pwidth = ((panel_info.vl_col+7) >> 3);
for (y=0; y<panel_info.vl_row; y++) {
i = y * pwidth;
for (x=0; x<pwidth; x+=5) {
serial_putc_raw_dev (PSOC_PSC, (p[i+x+2]<<4 & 0xF0) | (p[i+x+3]>>4 & 0x0F));
serial_putc_raw_dev (PSOC_PSC, (p[i+x+3]<<4 & 0xF0) | (p[i+x+4]>>4 & 0x0F));
serial_putc_raw_dev (PSOC_PSC, (p[i+x+4]<<4 & 0xF0) | (p[i+x]>>4 & 0x0F));
serial_putc_raw_dev (PSOC_PSC, (p[i+x]<<4 & 0xF0) | (p[i+x+1]>>4 & 0x0F));
serial_putc_raw_dev (PSOC_PSC, (p[i+x+1]<<4 & 0xF0) | (p[i+x+2]>>4 & 0x0F));
}
}
}
#endif
/* 3 */
serial_setrts_dev (PSOC_PSC, RTS_NEGATE);
for (retries = PSOC_RETRIES; retries; retries--) {
if (serial_getcts_dev(PSOC_PSC) == CTS_NEGATE)
break;
udelay (PSOC_WAIT_TIME);
}
if (!retries) {
printf ("%s Error: PSoC doesn't respond on "
"RTS NEGATE\n", __FUNCTION__);
}
return;
}
#endif /* CONFIG_LCD */
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