Wolfgang Denk
19 years ago
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0fd30252c8
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e8143e72e1
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/*
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* (C) Copyright 2006 |
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
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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 as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
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* MA 02111-1307 USA |
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*/ |
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#include <common.h> |
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#include <lcd.h> |
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#include <mpc5xxx.h> |
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#ifdef CONFIG_LCD |
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#define SWAPPED_LCD |
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/*
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* The name of the device used for communication |
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* with the PSoC. |
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*/ |
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#define PSOC_PSC MPC5XXX_PSC2 |
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#define PSOC_BAUD 500000UL |
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#define RTS_ASSERT 1 |
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#define RTS_NEGATE 0 |
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#define CTS_ASSERT 1 |
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#define CTS_NEGATE 0 |
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/*
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* Dimensions in pixels |
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*/ |
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#define LCD_WIDTH 160 |
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#define LCD_HEIGHT 100 |
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/*
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* Dimensions in bytes |
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*/ |
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#define LCD_BUF_SIZE ((LCD_WIDTH*LCD_HEIGHT)>>3) |
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#if LCD_BPP != LCD_MONOCHROME |
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#error "MCC200 support only monochrome displays (1 bpp)!" |
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#endif |
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#define PSOC_RETRIES 10 /* each of PSOC_WAIT_TIME */ |
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#define PSOC_WAIT_TIME 10 /* usec */ |
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DECLARE_GLOBAL_DATA_PTR; |
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/*
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* LCD information |
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*/ |
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vidinfo_t panel_info = { |
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LCD_WIDTH, LCD_HEIGHT, LCD_BPP |
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}; |
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int lcd_line_length; |
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int lcd_color_fg; |
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int lcd_color_bg; |
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/*
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* Frame buffer memory information |
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*/ |
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void *lcd_base; /* Start of framebuffer memory */ |
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void *lcd_console_address; /* Start of console buffer */ |
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short console_col = 0; |
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short console_row = 0; |
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/*
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* The device we use to communicate with PSoC |
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*/ |
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int serial_inited = 0; |
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/*
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* Exported functions |
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*/ |
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void lcd_initcolregs (void); |
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void lcd_ctrl_init (void *lcdbase); |
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void lcd_enable (void); |
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/*
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* Imported functions to support the PSoC protocol |
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*/ |
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extern int serial_init_dev (unsigned long dev_base); |
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extern void serial_setrts_dev (unsigned long dev_base, int s); |
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extern int serial_getcts_dev (unsigned long dev_base); |
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extern void serial_putc_raw_dev(unsigned long dev_base, const char c); |
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/*
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* Just stubs for our driver, needed for compiling compabilty with |
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* the common LCD driver code. |
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*/ |
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void lcd_initcolregs (void) |
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{ |
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} |
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void lcd_ctrl_init (void *lcdbase) |
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{ |
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} |
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/*
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* Function sends the contents of the frame-buffer to the LCD |
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*/ |
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void lcd_enable (void) |
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{ |
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int i, retries, fb_size; |
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if (!serial_inited) { |
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unsigned long baud; |
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baud = gd->baudrate; |
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gd->baudrate = PSOC_BAUD; |
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serial_init_dev(PSOC_PSC); |
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gd->baudrate = baud; |
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serial_setrts_dev (PSOC_PSC, RTS_ASSERT); |
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serial_inited = 1; |
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} |
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/*
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* Implement PSoC communication protocol: |
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* 1. Assert RTS, wait CTS assertion |
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* 2. Transmit data |
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* 3. Negate RTS, wait CTS negation |
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*/ |
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/* 1 */ |
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serial_setrts_dev (PSOC_PSC, RTS_ASSERT); |
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for (retries = PSOC_RETRIES; retries; retries--) { |
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if (serial_getcts_dev(PSOC_PSC) == CTS_ASSERT) |
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break; |
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udelay (PSOC_WAIT_TIME); |
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} |
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if (!retries) { |
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printf ("%s Error: PSoC doesn't respond on " |
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"RTS ASSERT\n", __FUNCTION__); |
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} |
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/* 2 */ |
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fb_size = panel_info.vl_row * (panel_info.vl_col >> 3); |
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#if !defined(SWAPPED_LCD) |
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for (i=0; i<fb_size; i++) { |
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serial_putc_raw_dev (PSOC_PSC, ((char *)lcd_base)[i]); |
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} |
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#else |
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{ |
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int x, y, pwidth; |
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char *p = (char *)lcd_base; |
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pwidth = ((panel_info.vl_col+7) >> 3); |
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for (y=0; y<panel_info.vl_row; y++) { |
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i = y * pwidth; |
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for (x=0; x<pwidth; x+=5) { |
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serial_putc_raw_dev (PSOC_PSC, (p[i+x+2]<<4 & 0xF0) | (p[i+x+3]>>4 & 0x0F)); |
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serial_putc_raw_dev (PSOC_PSC, (p[i+x+3]<<4 & 0xF0) | (p[i+x+4]>>4 & 0x0F)); |
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serial_putc_raw_dev (PSOC_PSC, (p[i+x+4]<<4 & 0xF0) | (p[i+x]>>4 & 0x0F)); |
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serial_putc_raw_dev (PSOC_PSC, (p[i+x]<<4 & 0xF0) | (p[i+x+1]>>4 & 0x0F)); |
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serial_putc_raw_dev (PSOC_PSC, (p[i+x+1]<<4 & 0xF0) | (p[i+x+2]>>4 & 0x0F)); |
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} |
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} |
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} |
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#endif |
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/* 3 */ |
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serial_setrts_dev (PSOC_PSC, RTS_NEGATE); |
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for (retries = PSOC_RETRIES; retries; retries--) { |
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if (serial_getcts_dev(PSOC_PSC) == CTS_NEGATE) |
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break; |
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udelay (PSOC_WAIT_TIME); |
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} |
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if (!retries) { |
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printf ("%s Error: PSoC doesn't respond on " |
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"RTS NEGATE\n", __FUNCTION__); |
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} |
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return; |
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} |
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#endif /* CONFIG_LCD */ |
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