common/console.c

   1 /*
   2  * (C) Copyright 2000
   3  * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <config.h>
  25 #include <common.h>
  26 #include <stdarg.h>
  27 #include <malloc.h>
  28 #include <param.h>
  29 #include <console.h>
  30 #include <driver.h>
  31 #include <fs.h>
  32 #include <reloc.h>
  33 #include <init.h>
  34 #include <clock.h>
  35 #include <kfifo.h>
  36 #include <module.h>
  37 #include <list.h>
  38
  39 LIST_HEAD(console_list);
  40 EXPORT_SYMBOL(console_list);
  41
  42 #define CONSOLE_UNINITIALIZED   0
  43 #define CONSOLE_INIT_EARLY      1
  44 #define CONSOLE_INIT_FULL       2
  45
  46 extern char version_string[];
  47
  48 static void display_banner (void)
  49 {
  50         printf (RELOC("\n\n%s\n\n"), RELOC_VAR(version_string));
  51         printf(RELOC("Board: " CONFIG_BOARDINFO "\n"));
  52 }
  53
  54 static int __initdata initialized = 0;
  55
  56 static int console_std_set(struct device_d *dev, struct param_d *param,
  57                 const char *val)
  58 {
  59         struct console_device *cdev = dev->type_data;
  60         unsigned int flag = 0, i = 0;
  61
  62         if (strchr(val, 'i') && cdev->f_caps & CONSOLE_STDIN) {
  63                 cdev->active[i++] = 'i';
  64                 flag |= CONSOLE_STDIN;
  65         }
  66
  67         if (strchr(val, 'o') && cdev->f_caps & CONSOLE_STDOUT) {
  68                 cdev->active[i++] = 'o';
  69                 flag |= CONSOLE_STDOUT;
  70         }
  71
  72         if (strchr(val, 'e') && cdev->f_caps & CONSOLE_STDERR) {
  73                 cdev->active[i++] = 'e';
  74                 flag |= CONSOLE_STDERR;
  75         }
  76
  77         cdev->active[i] = 0;
  78         cdev->f_active = flag;
  79
  80         return 0;
  81 }
  82
  83 static int console_baudrate_set(struct device_d *dev, struct param_d *param,
  84                 const char *val)
  85 {
  86         struct console_device *cdev = dev->type_data;
  87         int baudrate;
  88         unsigned char c;
  89
  90         baudrate = simple_strtoul(val, NULL, 10);
  91
  92         if (cdev->f_active) {
  93                 printf("## Switch baudrate to %d bps and press ENTER ...\n",
  94                         baudrate);
  95                 mdelay(50);
  96                 cdev->setbrg(cdev, baudrate);
  97                 mdelay(50);
  98                 do {
  99                         c = getc();
 100                 } while (c != '\r' && c != '\n');
 101         } else
 102                 cdev->setbrg(cdev, baudrate);
 103
 104         sprintf(cdev->baudrate_string, "%d", baudrate);
 105
 106         return 0;
 107 }
 108
 109 static struct kfifo *console_input_buffer;
 110 static struct kfifo *console_output_buffer;
 111
 112 int getc_buffer_flush(void)
 113 {
 114         console_input_buffer = kfifo_alloc(1024);
 115         console_output_buffer = kfifo_alloc(1024);
 116         return 0;
 117 }
 118
 119 postcore_initcall(getc_buffer_flush);
 120
 121 int console_register(struct console_device *newcdev)
 122 {
 123         struct device_d *dev = &newcdev->class_dev;
 124         int first = 0;
 125         char ch;
 126
 127         strcpy(dev->name, "cs");
 128         dev->type_data = newcdev;
 129         register_device(dev);
 130
 131         if (newcdev->setbrg) {
 132                 newcdev->baudrate_param.set = console_baudrate_set;
 133                 newcdev->baudrate_param.name = "baudrate";
 134                 sprintf(newcdev->baudrate_string, "%d",
 135                         CONFIG_BAUDRATE);
 136                 console_baudrate_set(dev, &newcdev->baudrate_param,
 137                         newcdev->baudrate_string);
 138                 newcdev->baudrate_param.value = newcdev->baudrate_string;
 139                 dev_add_param(dev, &newcdev->baudrate_param);
 140         }
 141
 142         newcdev->active_param.set = console_std_set;
 143         newcdev->active_param.name  = "active";
 144         newcdev->active_param.value = newcdev->active;
 145         dev_add_param(dev, &newcdev->active_param);
 146
 147         initialized = CONSOLE_INIT_FULL;
 148 #ifdef CONFIG_CONSOLE_ACTIVATE_ALL
 149         console_std_set(dev, &newcdev->active_param, "ioe");
 150 #endif
 151 #ifdef CONFIG_CONSOLE_ACTIVATE_FIRST
 152         if (list_empty(&console_list)) {
 153                 first = 1;
 154                 console_std_set(dev, &newcdev->active_param, "ioe");
 155         }
 156 #endif
 157
 158         list_add_tail(&newcdev->list, &console_list);
 159
 160         if (console_output_buffer) {
 161                 while (kfifo_getc(console_output_buffer, &ch) == 0)
 162                         console_putc(CONSOLE_STDOUT, ch);
 163                 kfifo_free(console_output_buffer);
 164                 console_output_buffer = NULL;
 165         }
 166
 167 #ifndef CONFIG_HAS_EARLY_INIT
 168         if (first)
 169                 display_banner();
 170 #endif
 171
 172         return 0;
 173 }
 174 EXPORT_SYMBOL(console_register);
 175
 176 static int getc_raw(void)
 177 {
 178         struct console_device *cdev;
 179         int active = 0;
 180
 181         while (1) {
 182                 for_each_console(cdev) {
 183                         if (!(cdev->f_active & CONSOLE_STDIN))
 184                                 continue;
 185                         active = 1;
 186                         if (cdev->tstc(cdev))
 187                                 return cdev->getc(cdev);
 188                 }
 189                 if (!active)
 190                         /* no active console found. bail out */
 191                         return -1;
 192         }
 193 }
 194
 195 int getc(void)
 196 {
 197         unsigned char ch;
 198         uint64_t start;
 199
 200         /*
 201          * For 100us we read the characters from the serial driver
 202          * into a kfifo. This helps us not to lose characters
 203          * in small hardware fifos.
 204          */
 205         start = get_time_ns();
 206         while (1) {
 207                 if (tstc()) {
 208                         kfifo_putc(console_input_buffer, getc_raw());
 209
 210                         start = get_time_ns();
 211                 }
 212                 if (is_timeout(start, 100 * USECOND) &&
 213                                 kfifo_len(console_input_buffer))
 214                         break;
 215         }
 216
 217         kfifo_getc(console_input_buffer, &ch);
 218         return ch;
 219 }
 220 EXPORT_SYMBOL(getc);
 221
 222 int fgetc(int fd)
 223 {
 224         char c;
 225
 226         if (!fd)
 227                 return getc();
 228         return read(fd, &c, 1);
 229 }
 230 EXPORT_SYMBOL(fgetc);
 231
 232 int tstc(void)
 233 {
 234         struct console_device *cdev;
 235
 236         for_each_console(cdev) {
 237                 if (!(cdev->f_active & CONSOLE_STDIN))
 238                         continue;
 239                 if (cdev->tstc(cdev))
 240                         return 1;
 241         }
 242
 243         return 0;
 244 }
 245 EXPORT_SYMBOL(tstc);
 246
 247 void __initdata *early_console_base;
 248
 249 void console_putc(unsigned int ch, char c)
 250 {
 251         struct console_device *cdev;
 252         int init = INITDATA(initialized);
 253
 254         switch (init) {
 255         case CONSOLE_UNINITIALIZED:
 256                 kfifo_putc(console_output_buffer, c);
 257                 return;
 258
 259 #ifdef CONFIG_HAS_EARLY_INIT
 260         case CONSOLE_INIT_EARLY:
 261                 early_console_putc(INITDATA(early_console_base), c);
 262                 return;
 263 #endif
 264
 265         case CONSOLE_INIT_FULL:
 266                 for_each_console(cdev) {
 267                         if (cdev->f_active & ch) {
 268                                 if (c == '\n')
 269                                         cdev->putc(cdev, '\r');
 270                                 cdev->putc(cdev, c);
 271                         }
 272                 }
 273                 return;
 274         default:
 275                 /* If we have problems inititalizing our data
 276                  * get them early
 277                  */
 278                 hang();
 279         }
 280 }
 281 EXPORT_SYMBOL(console_putc);
 282
 283 int fputc(int fd, char c)
 284 {
 285         if(list_empty(&console_list)) {
 286                 if(!fd)
 287                         console_putc(0, c);
 288                 return 0;
 289         }
 290
 291         if (fd == 1)
 292                 putchar(c);
 293         else if (fd == 2)
 294                 eputc(c);
 295         else
 296                 return write(fd, &c, 1);
 297         return 0;
 298 }
 299 EXPORT_SYMBOL(fputc);
 300
 301 void console_puts(unsigned int ch, const char *str)
 302 {
 303         const char *s = str;
 304         while (*s) {
 305                 if (*s == '\n')
 306                         console_putc(ch, '\r');
 307                 console_putc(ch, *s);
 308                 s++;
 309         }
 310 }
 311 EXPORT_SYMBOL(console_puts);
 312
 313 int fputs(int fd, const char *s)
 314 {
 315         if (fd == 1)
 316                 puts(s);
 317         else if (fd == 2)
 318                 eputs(s);
 319         else
 320                 return write(fd, s, strlen(s));
 321         return 0;
 322 }
 323 EXPORT_SYMBOL(fputs);
 324
 325 void console_flush(void)
 326 {
 327         struct console_device *cdev;
 328
 329         for_each_console(cdev) {
 330                 if (cdev->flush)
 331                         cdev->flush(cdev);
 332         }
 333 }
 334 EXPORT_SYMBOL(console_flush);
 335
 336 void fprintf (int file, const char *fmt, ...)
 337 {
 338         va_list args;
 339         uint i;
 340         char printbuffer[CFG_PBSIZE];
 341
 342         va_start (args, fmt);
 343
 344         /* For this to work, printbuffer must be larger than
 345          * anything we ever want to print.
 346          */
 347         i = vsprintf (printbuffer, fmt, args);
 348         va_end (args);
 349
 350         /* Print the string */
 351         fputs (file, printbuffer);
 352 }
 353 EXPORT_SYMBOL(fprintf);
 354
 355 int printf (const char *fmt, ...)
 356 {
 357         va_list args;
 358         uint i;
 359         char printbuffer[CFG_PBSIZE];
 360
 361         va_start (args, fmt);
 362
 363         /* For this to work, printbuffer must be larger than
 364          * anything we ever want to print.
 365          */
 366         i = vsprintf (printbuffer, fmt, args);
 367         va_end (args);
 368
 369         /* Print the string */
 370         puts (printbuffer);
 371
 372         return i;
 373 }
 374 EXPORT_SYMBOL(printf);
 375
 376 int vprintf (const char *fmt, va_list args)
 377 {
 378         uint i;
 379         char printbuffer[CFG_PBSIZE];
 380
 381         /* For this to work, printbuffer must be larger than
 382          * anything we ever want to print.
 383          */
 384         i = vsprintf (printbuffer, fmt, args);
 385
 386         /* Print the string */
 387         puts (printbuffer);
 388
 389         return i;
 390 }
 391 EXPORT_SYMBOL(vprintf);
 392
 393 #ifndef ARCH_HAS_CTRLC
 394 /* test if ctrl-c was pressed */
 395 int ctrlc (void)
 396 {
 397         if (tstc() && getc() == 3)
 398                 return 1;
 399         return 0;
 400 }
 401 EXPORT_SYMBOL(ctrlc);
 402 #endif /* ARCH_HAS_CTRC */
 403
 404 #ifdef CONFIG_HAS_EARLY_INIT
 405
 406 void early_console_start(const char *name, int baudrate)
 407 {
 408         void *base = get_early_console_base(name);
 409
 410         if (base) {
 411                 early_console_init(base, baudrate);
 412                 INITDATA(initialized) = CONSOLE_INIT_EARLY;
 413                 INITDATA(early_console_base) = base;
 414                 display_banner();
 415         }
 416 }
 417
 418 #endif