drivers/serial/serial.c

   1 /*
   2  * (C) Copyright 2004
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   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 <common.h>
  25 #include <serial.h>
  26 #include <stdio_dev.h>
  27 #include <post.h>
  28 #include <linux/compiler.h>
  29 #include <errno.h>
  30
  31 DECLARE_GLOBAL_DATA_PTR;
  32
  33 static struct serial_device *serial_devices;
  34 static struct serial_device *serial_current;
  35
  36 static void serial_null(void)
  37 {
  38 }
  39
  40 #define serial_initfunc(name)                                   \
  41         void name(void)                                         \
  42                 __attribute__((weak, alias("serial_null")));
  43
  44 serial_initfunc(mpc8xx_serial_initialize);
  45 serial_initfunc(ns16550_serial_initialize);
  46 serial_initfunc(pxa_serial_initialize);
  47 serial_initfunc(s3c24xx_serial_initialize);
  48 serial_initfunc(s5p_serial_initialize);
  49 serial_initfunc(zynq_serial_initalize);
  50 serial_initfunc(bfin_serial_initialize);
  51 serial_initfunc(bfin_jtag_initialize);
  52 serial_initfunc(mpc512x_serial_initialize);
  53 serial_initfunc(uartlite_serial_initialize);
  54 serial_initfunc(au1x00_serial_initialize);
  55 serial_initfunc(asc_serial_initialize);
  56 serial_initfunc(jz_serial_initialize);
  57 serial_initfunc(mpc5xx_serial_initialize);
  58 serial_initfunc(mpc8220_serial_initialize);
  59 serial_initfunc(mpc8260_scc_serial_initialize);
  60 serial_initfunc(mpc8260_smc_serial_initialize);
  61 serial_initfunc(mpc85xx_serial_initialize);
  62 serial_initfunc(iop480_serial_initialize);
  63 serial_initfunc(leon2_serial_initialize);
  64 serial_initfunc(leon3_serial_initialize);
  65 serial_initfunc(marvell_serial_initialize);
  66 serial_initfunc(amirix_serial_initialize);
  67 serial_initfunc(bmw_serial_initialize);
  68 serial_initfunc(cogent_serial_initialize);
  69 serial_initfunc(cpci750_serial_initialize);
  70 serial_initfunc(evb64260_serial_initialize);
  71 serial_initfunc(ml2_serial_initialize);
  72 serial_initfunc(sconsole_serial_initialize);
  73 serial_initfunc(p3mx_serial_initialize);
  74 serial_initfunc(altera_jtag_serial_initialize);
  75 serial_initfunc(altera_serial_initialize);
  76 serial_initfunc(atmel_serial_initialize);
  77 serial_initfunc(lpc32xx_serial_initialize);
  78 serial_initfunc(mcf_serial_initialize);
  79 serial_initfunc(ns9750_serial_initialize);
  80 serial_initfunc(oc_serial_initialize);
  81 serial_initfunc(s3c4510b_serial_initialize);
  82 serial_initfunc(s3c64xx_serial_initialize);
  83 serial_initfunc(sandbox_serial_initialize);
  84 serial_initfunc(clps7111_serial_initialize);
  85 serial_initfunc(imx_serial_initialize);
  86 serial_initfunc(ixp_serial_initialize);
  87 serial_initfunc(ks8695_serial_initialize);
  88 serial_initfunc(lh7a40x_serial_initialize);
  89 serial_initfunc(lpc2292_serial_initialize);
  90 serial_initfunc(max3100_serial_initialize);
  91 serial_initfunc(mxc_serial_initialize);
  92 serial_initfunc(netarm_serial_initialize);
  93 serial_initfunc(pl01x_serial_initialize);
  94 serial_initfunc(s3c44b0_serial_initialize);
  95 serial_initfunc(sa1100_serial_initialize);
  96 serial_initfunc(sh_serial_initialize);
  97
  98 void serial_register(struct serial_device *dev)
  99 {
 100 #ifdef CONFIG_NEEDS_MANUAL_RELOC
 101         if (dev->start)
 102                 dev->start += gd->reloc_off;
 103         if (dev->stop)
 104                 dev->stop += gd->reloc_off;
 105         if (dev->setbrg)
 106                 dev->setbrg += gd->reloc_off;
 107         if (dev->getc)
 108                 dev->getc += gd->reloc_off;
 109         if (dev->tstc)
 110                 dev->tstc += gd->reloc_off;
 111         if (dev->putc)
 112                 dev->putc += gd->reloc_off;
 113         if (dev->puts)
 114                 dev->puts += gd->reloc_off;
 115 #endif
 116
 117         dev->next = serial_devices;
 118         serial_devices = dev;
 119 }
 120
 121 void serial_initialize(void)
 122 {
 123         mpc8xx_serial_initialize();
 124         ns16550_serial_initialize();
 125         pxa_serial_initialize();
 126         s3c24xx_serial_initialize();
 127         s5p_serial_initialize();
 128         mpc512x_serial_initialize();
 129         bfin_serial_initialize();
 130         bfin_jtag_initialize();
 131         uartlite_serial_initialize();
 132         zynq_serial_initalize();
 133         au1x00_serial_initialize();
 134         asc_serial_initialize();
 135         jz_serial_initialize();
 136         mpc5xx_serial_initialize();
 137         mpc8220_serial_initialize();
 138         mpc8260_scc_serial_initialize();
 139         mpc8260_smc_serial_initialize();
 140         mpc85xx_serial_initialize();
 141         iop480_serial_initialize();
 142         leon2_serial_initialize();
 143         leon3_serial_initialize();
 144         marvell_serial_initialize();
 145         amirix_serial_initialize();
 146         bmw_serial_initialize();
 147         cogent_serial_initialize();
 148         cpci750_serial_initialize();
 149         evb64260_serial_initialize();
 150         ml2_serial_initialize();
 151         sconsole_serial_initialize();
 152         p3mx_serial_initialize();
 153         altera_jtag_serial_initialize();
 154         altera_serial_initialize();
 155         atmel_serial_initialize();
 156         lpc32xx_serial_initialize();
 157         mcf_serial_initialize();
 158         ns9750_serial_initialize();
 159         oc_serial_initialize();
 160         s3c4510b_serial_initialize();
 161         s3c64xx_serial_initialize();
 162         sandbox_serial_initialize();
 163         clps7111_serial_initialize();
 164         imx_serial_initialize();
 165         ixp_serial_initialize();
 166         ks8695_serial_initialize();
 167         lh7a40x_serial_initialize();
 168         lpc2292_serial_initialize();
 169         max3100_serial_initialize();
 170         mxc_serial_initialize();
 171         netarm_serial_initialize();
 172         pl01x_serial_initialize();
 173         s3c44b0_serial_initialize();
 174         sa1100_serial_initialize();
 175         sh_serial_initialize();
 176
 177         serial_assign(default_serial_console()->name);
 178 }
 179
 180 void serial_stdio_init(void)
 181 {
 182         struct stdio_dev dev;
 183         struct serial_device *s = serial_devices;
 184
 185         while (s) {
 186                 memset(&dev, 0, sizeof(dev));
 187
 188                 strcpy(dev.name, s->name);
 189                 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
 190
 191                 dev.start = s->start;
 192                 dev.stop = s->stop;
 193                 dev.putc = s->putc;
 194                 dev.puts = s->puts;
 195                 dev.getc = s->getc;
 196                 dev.tstc = s->tstc;
 197
 198                 stdio_register(&dev);
 199
 200                 s = s->next;
 201         }
 202 }
 203
 204 int serial_assign(const char *name)
 205 {
 206         struct serial_device *s;
 207
 208         for (s = serial_devices; s; s = s->next) {
 209                 if (strcmp(s->name, name))
 210                         continue;
 211                 serial_current = s;
 212                 return 0;
 213         }
 214
 215         return -EINVAL;
 216 }
 217
 218 void serial_reinit_all(void)
 219 {
 220         struct serial_device *s;
 221
 222         for (s = serial_devices; s; s = s->next)
 223                 s->start();
 224 }
 225
 226 static struct serial_device *get_current(void)
 227 {
 228         struct serial_device *dev;
 229
 230         if (!(gd->flags & GD_FLG_RELOC))
 231                 dev = default_serial_console();
 232         else if (!serial_current)
 233                 dev = default_serial_console();
 234         else
 235                 dev = serial_current;
 236
 237         /* We must have a console device */
 238         if (!dev) {
 239 #ifdef CONFIG_SPL_BUILD
 240                 puts("Cannot find console\n");
 241                 hang();
 242 #else
 243                 panic("Cannot find console\n");
 244 #endif
 245         }
 246
 247         return dev;
 248 }
 249
 250 int serial_init(void)
 251 {
 252         return get_current()->start();
 253 }
 254
 255 void serial_setbrg(void)
 256 {
 257         get_current()->setbrg();
 258 }
 259
 260 int serial_getc(void)
 261 {
 262         return get_current()->getc();
 263 }
 264
 265 int serial_tstc(void)
 266 {
 267         return get_current()->tstc();
 268 }
 269
 270 void serial_putc(const char c)
 271 {
 272         get_current()->putc(c);
 273 }
 274
 275 void serial_puts(const char *s)
 276 {
 277         get_current()->puts(s);
 278 }
 279
 280 void default_serial_puts(const char *s)
 281 {
 282         struct serial_device *dev = get_current();
 283         while (*s)
 284                 dev->putc(*s++);
 285 }
 286
 287 #if CONFIG_POST & CONFIG_SYS_POST_UART
 288 static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE;
 289
 290 /* Mark weak until post/cpu/.../uart.c migrate over */
 291 __weak
 292 int uart_post_test(int flags)
 293 {
 294         unsigned char c;
 295         int ret, saved_baud, b;
 296         struct serial_device *saved_dev, *s;
 297         bd_t *bd = gd->bd;
 298
 299         /* Save current serial state */
 300         ret = 0;
 301         saved_dev = serial_current;
 302         saved_baud = bd->bi_baudrate;
 303
 304         for (s = serial_devices; s; s = s->next) {
 305                 /* If this driver doesn't support loop back, skip it */
 306                 if (!s->loop)
 307                         continue;
 308
 309                 /* Test the next device */
 310                 serial_current = s;
 311
 312                 ret = serial_init();
 313                 if (ret)
 314                         goto done;
 315
 316                 /* Consume anything that happens to be queued */
 317                 while (serial_tstc())
 318                         serial_getc();
 319
 320                 /* Enable loop back */
 321                 s->loop(1);
 322
 323                 /* Test every available baud rate */
 324                 for (b = 0; b < ARRAY_SIZE(bauds); ++b) {
 325                         bd->bi_baudrate = bauds[b];
 326                         serial_setbrg();
 327
 328                         /*
 329                          * Stick to printable chars to avoid issues:
 330                          *  - terminal corruption
 331                          *  - serial program reacting to sequences and sending
 332                          *    back random extra data
 333                          *  - most serial drivers add in extra chars (like \r\n)
 334                          */
 335                         for (c = 0x20; c < 0x7f; ++c) {
 336                                 /* Send it out */
 337                                 serial_putc(c);
 338
 339                                 /* Make sure it's the same one */
 340                                 ret = (c != serial_getc());
 341                                 if (ret) {
 342                                         s->loop(0);
 343                                         goto done;
 344                                 }
 345
 346                                 /* Clean up the output in case it was sent */
 347                                 serial_putc('\b');
 348                                 ret = ('\b' != serial_getc());
 349                                 if (ret) {
 350                                         s->loop(0);
 351                                         goto done;
 352                                 }
 353                         }
 354                 }
 355
 356                 /* Disable loop back */
 357                 s->loop(0);
 358
 359                 /* XXX: There is no serial_stop() !? */
 360                 if (s->stop)
 361                         s->stop();
 362         }
 363
 364  done:
 365         /* Restore previous serial state */
 366         serial_current = saved_dev;
 367         bd->bi_baudrate = saved_baud;
 368         serial_reinit_all();
 369         serial_setbrg();
 370
 371         return ret;
 372 }
 373 #endif