board/mcc200/lcd.c

   1 /*
   2  * (C) Copyright 2006
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation; either version 2 of
   8  * the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  18  * MA 02111-1307 USA
  19  */
  20
  21 #include <common.h>
  22 #include <lcd.h>
  23 #include <mpc5xxx.h>
  24
  25 #ifdef CONFIG_LCD
  26
  27 #define SWAPPED_LCD
  28 /*
  29  *  The name of the device used for communication
  30  * with the PSoC.
  31  */
  32 #define PSOC_PSC        MPC5XXX_PSC2
  33 #define PSOC_BAUD       500000UL
  34
  35 #define RTS_ASSERT      1
  36 #define RTS_NEGATE      0
  37 #define CTS_ASSERT      1
  38 #define CTS_NEGATE      0
  39
  40 /*
  41  * Dimensions in pixels
  42  */
  43 #define LCD_WIDTH       160
  44 #define LCD_HEIGHT      100
  45
  46 /*
  47  * Dimensions in bytes
  48  */
  49 #define LCD_BUF_SIZE    ((LCD_WIDTH*LCD_HEIGHT)>>3)
  50
  51 #if LCD_BPP != LCD_MONOCHROME
  52 #error "MCC200 support only monochrome displays (1 bpp)!"
  53 #endif
  54
  55 #define PSOC_RETRIES    10      /* each of PSOC_WAIT_TIME */
  56 #define PSOC_WAIT_TIME  10      /* usec */
  57
  58 DECLARE_GLOBAL_DATA_PTR;
  59
  60 /*
  61  * LCD information
  62  */
  63 vidinfo_t panel_info = {
  64         LCD_WIDTH, LCD_HEIGHT, LCD_BPP
  65 };
  66
  67 int lcd_line_length;
  68
  69 int lcd_color_fg;
  70 int lcd_color_bg;
  71
  72 /*
  73  * Frame buffer memory information
  74  */
  75 void *lcd_base;                 /* Start of framebuffer memory  */
  76 void *lcd_console_address;      /* Start of console buffer      */
  77
  78 short console_col = 0;
  79 short console_row = 0;
  80
  81 /*
  82  *  The device we use to communicate with PSoC
  83  */
  84 int serial_inited = 0;
  85
  86 /*
  87  * Exported functions
  88  */
  89 void lcd_initcolregs (void);
  90 void lcd_ctrl_init (void *lcdbase);
  91 void lcd_enable (void);
  92
  93 /*
  94  *  Imported functions to support the PSoC protocol
  95  */
  96 extern int serial_init_dev (unsigned long dev_base);
  97 extern void serial_setrts_dev (unsigned long dev_base, int s);
  98 extern int serial_getcts_dev (unsigned long dev_base);
  99 extern void serial_putc_raw_dev(unsigned long dev_base, const char c);
 100
 101 /*
 102  *  Just stubs for our driver, needed for compiling compabilty with
 103  * the common LCD driver code.
 104  */
 105 void lcd_initcolregs (void)
 106 {
 107 }
 108
 109 void lcd_ctrl_init (void *lcdbase)
 110 {
 111 }
 112
 113 /*
 114  * Function sends the contents of the frame-buffer to the LCD
 115  */
 116 void lcd_enable (void)
 117 {
 118         int i, retries, fb_size;
 119
 120         if (!serial_inited) {
 121                 unsigned long baud;
 122
 123                 baud = gd->baudrate;
 124                 gd->baudrate = PSOC_BAUD;
 125                 serial_init_dev(PSOC_PSC);
 126                 gd->baudrate = baud;
 127                 serial_setrts_dev (PSOC_PSC, RTS_ASSERT);
 128                 serial_inited = 1;
 129         }
 130
 131         /*
 132          *  Implement PSoC communication protocol:
 133          * 1. Assert RTS, wait CTS assertion
 134          * 2. Transmit data
 135          * 3. Negate RTS, wait CTS negation
 136          */
 137
 138         /* 1 */
 139         serial_setrts_dev (PSOC_PSC, RTS_ASSERT);
 140         for (retries = PSOC_RETRIES; retries; retries--) {
 141                 if (serial_getcts_dev(PSOC_PSC) == CTS_ASSERT)
 142                         break;
 143                 udelay (PSOC_WAIT_TIME);
 144         }
 145         if (!retries) {
 146                 printf ("%s Error: PSoC doesn't respond on "
 147                         "RTS ASSERT\n", __FUNCTION__);
 148         }
 149
 150         /* 2 */
 151         fb_size = panel_info.vl_row * (panel_info.vl_col >> 3);
 152
 153 #if !defined(SWAPPED_LCD)
 154         for (i=0; i<fb_size; i++) {
 155                 serial_putc_raw_dev (PSOC_PSC, ((char *)lcd_base)[i]);
 156         }
 157 #else
 158     {
 159         int x, y, pwidth;
 160         char *p = (char *)lcd_base;
 161
 162         pwidth = ((panel_info.vl_col+7) >> 3);
 163         for (y=0; y<panel_info.vl_row; y++) {
 164                 i = y * pwidth;
 165                 for (x=0; x<pwidth; x+=5) {
 166                         serial_putc_raw_dev (PSOC_PSC, (p[i+x+2]<<4 & 0xF0) | (p[i+x+3]>>4 & 0x0F));
 167                         serial_putc_raw_dev (PSOC_PSC, (p[i+x+3]<<4 & 0xF0) | (p[i+x+4]>>4 & 0x0F));
 168                         serial_putc_raw_dev (PSOC_PSC, (p[i+x+4]<<4 & 0xF0) | (p[i+x]>>4 & 0x0F));
 169                         serial_putc_raw_dev (PSOC_PSC, (p[i+x]<<4 & 0xF0) | (p[i+x+1]>>4 & 0x0F));
 170                         serial_putc_raw_dev (PSOC_PSC, (p[i+x+1]<<4 & 0xF0) | (p[i+x+2]>>4 & 0x0F));
 171                 }
 172         }
 173     }
 174 #endif
 175
 176         /* 3 */
 177         serial_setrts_dev (PSOC_PSC, RTS_NEGATE);
 178         for (retries = PSOC_RETRIES; retries; retries--) {
 179                 if (serial_getcts_dev(PSOC_PSC) == CTS_NEGATE)
 180                         break;
 181                 udelay (PSOC_WAIT_TIME);
 182         }
 183         if (!retries) {
 184                 printf ("%s Error: PSoC doesn't respond on "
 185                         "RTS NEGATE\n", __FUNCTION__);
 186         }
 187
 188         return;
 189 }
 190 #endif /* CONFIG_LCD */