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