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