board/cogent/lcd.c

   1 /* most of this is taken from the file */
   2 /* hal/powerpc/cogent/current/src/hal_diag.c in the */
   3 /* Cygnus eCos source. Here is the copyright notice: */
   4 /* */
   5 /*============================================================================= */
   6 /* */
   7 /*      hal_diag.c */
   8 /* */
   9 /*      HAL diagnostic output code */
  10 /* */
  11 /*============================================================================= */
  12 /*####COPYRIGHTBEGIN#### */
  13 /* */
  14 /* ------------------------------------------- */
  15 /* The contents of this file are subject to the Cygnus eCos Public License */
  16 /* Version 1.0 (the "License"); you may not use this file except in */
  17 /* compliance with the License.  You may obtain a copy of the License at */
  18 /* http://sourceware.cygnus.com/ecos */
  19 /* */
  20 /* Software distributed under the License is distributed on an "AS IS" */
  21 /* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the */
  22 /* License for the specific language governing rights and limitations under */
  23 /* the License. */
  24 /* */
  25 /* The Original Code is eCos - Embedded Cygnus Operating System, released */
  26 /* September 30, 1998. */
  27 /* */
  28 /* The Initial Developer of the Original Code is Cygnus.  Portions created */
  29 /* by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions.  All Rights Reserved. */
  30 /* ------------------------------------------- */
  31 /* */
  32 /*####COPYRIGHTEND#### */
  33 /*============================================================================= */
  34 /*#####DESCRIPTIONBEGIN#### */
  35 /* */
  36 /* Author(s):    nickg, jskov */
  37 /* Contributors: nickg, jskov */
  38 /* Date:         1999-03-23 */
  39 /* Purpose:      HAL diagnostic output */
  40 /* Description:  Implementations of HAL diagnostic output support. */
  41 /* */
  42 /*####DESCRIPTIONEND#### */
  43 /* */
  44 /*============================================================================= */
  45
  46 /*----------------------------------------------------------------------------- */
  47 /* Cogent board specific LCD code */
  48
  49 #include <common.h>
  50 #include <stdarg.h>
  51 #include <board/cogent/lcd.h>
  52
  53 static char lines[2][LCD_LINE_LENGTH+1];
  54 static int curline;
  55 static int linepos;
  56 static int heartbeat_active;
  57 /* make the next two strings exactly LCD_LINE_LENGTH (16) chars long */
  58 /* pad to the right with spaces if necessary */
  59 static char init_line0[LCD_LINE_LENGTH+1] = "U-Boot Cogent  ";
  60 static char init_line1[LCD_LINE_LENGTH+1] = "mjj, 11 Aug 2000";
  61
  62 static inline unsigned char
  63 lcd_read_status(cma_mb_lcd *clp)
  64 {
  65     /* read the Busy Status Register */
  66     return (cma_mb_reg_read(&clp->lcd_bsr));
  67 }
  68
  69 static inline void
  70 lcd_wait_not_busy(cma_mb_lcd *clp)
  71 {
  72     /*
  73      * wait for not busy
  74      * Note: It seems that the LCD isn't quite ready to process commands
  75      * when it clears the BUSY flag. Reading the status address an extra
  76      * time seems to give it enough breathing room.
  77      */
  78
  79     while (lcd_read_status(clp) & LCD_STAT_BUSY)
  80         ;
  81
  82     (void)lcd_read_status(clp);
  83 }
  84
  85 static inline void
  86 lcd_write_command(cma_mb_lcd *clp, unsigned char cmd)
  87 {
  88     lcd_wait_not_busy(clp);
  89
  90     /* write the Command Register */
  91     cma_mb_reg_write(&clp->lcd_cmd, cmd);
  92 }
  93
  94 static inline void
  95 lcd_write_data(cma_mb_lcd *clp, unsigned char data)
  96 {
  97     lcd_wait_not_busy(clp);
  98
  99     /* write the Current Character Register */
 100     cma_mb_reg_write(&clp->lcd_ccr, data);
 101 }
 102
 103 static inline void
 104 lcd_dis(int addr, char *string)
 105 {
 106     cma_mb_lcd *clp = (cma_mb_lcd *)CMA_MB_LCD_BASE;
 107     int pos, linelen;
 108
 109     linelen = LCD_LINE_LENGTH;
 110     if (heartbeat_active && addr == LCD_LINE0)
 111         linelen--;
 112
 113     lcd_write_command(clp, LCD_CMD_ADD + addr);
 114     for (pos = 0; *string != '\0' && pos < linelen; pos++)
 115         lcd_write_data(clp, *string++);
 116 }
 117
 118 void
 119 lcd_init(void)
 120 {
 121     cma_mb_lcd *clp = (cma_mb_lcd *)CMA_MB_LCD_BASE;
 122     int i;
 123
 124     /* configure the lcd for 8 bits/char, 2 lines and 5x7 dot matrix */
 125     lcd_write_command(clp, LCD_CMD_MODE);
 126
 127     /* turn the LCD display on */
 128     lcd_write_command(clp, LCD_CMD_DON);
 129
 130     curline = 0;
 131     linepos = 0;
 132
 133     for (i = 0; i < LCD_LINE_LENGTH; i++) {
 134         lines[0][i] = init_line0[i];
 135         lines[1][i] = init_line1[i];
 136     }
 137
 138     lines[0][LCD_LINE_LENGTH] = lines[1][LCD_LINE_LENGTH] = 0;
 139
 140     lcd_dis(LCD_LINE0, lines[0]);
 141     lcd_dis(LCD_LINE1, lines[1]);
 142
 143     printf("HD44780 2 line x %d char display\n", LCD_LINE_LENGTH);
 144 }
 145
 146 void
 147 lcd_write_char(const char c)
 148 {
 149     int i, linelen;
 150
 151     /* ignore CR */
 152     if (c == '\r')
 153         return;
 154
 155     linelen = LCD_LINE_LENGTH;
 156     if (heartbeat_active && curline == 0)
 157         linelen--;
 158
 159     if (c == '\n') {
 160         lcd_dis(LCD_LINE0, &lines[curline^1][0]);
 161         lcd_dis(LCD_LINE1, &lines[curline][0]);
 162
 163         /* Do a line feed */
 164         curline ^= 1;
 165         linelen = LCD_LINE_LENGTH;
 166         if (heartbeat_active && curline == 0)
 167             linelen--;
 168         linepos = 0;
 169
 170         for (i = 0; i < linelen; i++)
 171             lines[curline][i] = ' ';
 172
 173         return;
 174     }
 175
 176     /* Only allow to be output if there is room on the LCD line */
 177     if (linepos < linelen)
 178         lines[curline][linepos++] = c;
 179 }
 180
 181 void
 182 lcd_flush(void)
 183 {
 184     lcd_dis(LCD_LINE1, &lines[curline][0]);
 185 }
 186
 187 void
 188 lcd_write_string(const char *s)
 189 {
 190     char *p;
 191
 192     for (p = (char *)s; *p != '\0'; p++)
 193         lcd_write_char(*p);
 194 }
 195
 196 void
 197 lcd_printf(const char *fmt, ...)
 198 {
 199     va_list args;
 200     char buf[CFG_PBSIZE];
 201
 202     va_start(args, fmt);
 203     (void)vsprintf(buf, fmt, args);
 204     va_end(args);
 205
 206     lcd_write_string(buf);
 207 }
 208
 209 void
 210 lcd_heartbeat(void)
 211 {
 212     cma_mb_lcd *clp = (cma_mb_lcd *)CMA_MB_LCD_BASE;
 213 #if 0
 214     static char rotchars[] = { '|', '/', '-', '\\' };
 215 #else
 216     /* HD44780 Rom Code A00 has no backslash */
 217     static char rotchars[] = { '|', '/', '-', '\315' };
 218 #endif
 219     static int rotator_index = 0;
 220
 221     heartbeat_active = 1;
 222
 223     /* write the address */
 224     lcd_write_command(clp, LCD_CMD_ADD + LCD_LINE0 + (LCD_LINE_LENGTH - 1));
 225
 226     /* write the next char in the sequence */
 227     lcd_write_data(clp, rotchars[rotator_index]);
 228
 229     if (++rotator_index >= (sizeof rotchars / sizeof rotchars[0]))
 230         rotator_index = 0;
 231 }
 232
 233 #ifdef CONFIG_SHOW_ACTIVITY
 234 void board_show_activity (ulong timestamp)
 235 {
 236 #ifdef CONFIG_STATUS_LED
 237         if ((timestamp % (CFG_HZ / 2) == 0)
 238                 lcd_heartbeat ();
 239 #endif
 240 }
 241
 242 void show_activity(int arg)
 243 {
 244 }
 245 #endif