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Diffstat (limited to 'board/mcc200/lcd.c')
| -rw-r--r-- | board/mcc200/lcd.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/board/mcc200/lcd.c b/board/mcc200/lcd.c new file mode 100644 index 0000000..b262516 --- /dev/null +++ b/board/mcc200/lcd.c @@ -0,0 +1,190 @@ +/* + * (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 */ |