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