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
  76 void serial_register(struct serial_device *dev)
  77 {
  78 #ifdef CONFIG_NEEDS_MANUAL_RELOC
  79         dev->start += gd->reloc_off;
  80         dev->setbrg += gd->reloc_off;
  81         dev->getc += gd->reloc_off;
  82         dev->tstc += gd->reloc_off;
  83         dev->putc += gd->reloc_off;
  84         dev->puts += gd->reloc_off;
  85 #endif
  86
  87         dev->next = serial_devices;
  88         serial_devices = dev;
  89 }
  90
  91 void serial_initialize(void)
  92 {
  93         mpc8xx_serial_initialize();
  94         ns16550_serial_initialize();
  95         pxa_serial_initialize();
  96         s3c24xx_serial_initialize();
  97         s5p_serial_initialize();
  98         mpc512x_serial_initialize();
  99         bfin_serial_initialize();
 100         bfin_jtag_initialize();
 101         uartlite_serial_initialize();
 102         zynq_serial_initalize();
 103         au1x00_serial_initialize();
 104         asc_serial_initialize();
 105         jz_serial_initialize();
 106         mpc5xx_serial_initialize();
 107         mpc8220_serial_initialize();
 108         mpc8260_scc_serial_initialize();
 109         mpc8260_smc_serial_initialize();
 110         mpc85xx_serial_initialize();
 111         iop480_serial_initialize();
 112         leon2_serial_initialize();
 113         leon3_serial_initialize();
 114         marvell_serial_initialize();
 115         amirix_serial_initialize();
 116         bmw_serial_initialize();
 117         cogent_serial_initialize();
 118         cpci750_serial_initialize();
 119         evb64260_serial_initialize();
 120         ml2_serial_initialize();
 121         sconsole_serial_initialize();
 122         p3mx_serial_initialize();
 123         altera_jtag_serial_initialize();
 124         altera_serial_initialize();
 125
 126         serial_assign(default_serial_console()->name);
 127 }
 128
 129 void serial_stdio_init(void)
 130 {
 131         struct stdio_dev dev;
 132         struct serial_device *s = serial_devices;
 133
 134         while (s) {
 135                 memset(&dev, 0, sizeof(dev));
 136
 137                 strcpy(dev.name, s->name);
 138                 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
 139
 140                 dev.start = s->start;
 141                 dev.stop = s->stop;
 142                 dev.putc = s->putc;
 143                 dev.puts = s->puts;
 144                 dev.getc = s->getc;
 145                 dev.tstc = s->tstc;
 146
 147                 stdio_register(&dev);
 148
 149                 s = s->next;
 150         }
 151 }
 152
 153 int serial_assign(const char *name)
 154 {
 155         struct serial_device *s;
 156
 157         for (s = serial_devices; s; s = s->next) {
 158                 if (strcmp(s->name, name) == 0) {
 159                         serial_current = s;
 160                         return 0;
 161                 }
 162         }
 163
 164         return 1;
 165 }
 166
 167 void serial_reinit_all(void)
 168 {
 169         struct serial_device *s;
 170
 171         for (s = serial_devices; s; s = s->next)
 172                 s->start();
 173 }
 174
 175 static struct serial_device *get_current(void)
 176 {
 177         struct serial_device *dev;
 178
 179         if (!(gd->flags & GD_FLG_RELOC) || !serial_current) {
 180                 dev = default_serial_console();
 181
 182                 /* We must have a console device */
 183                 if (!dev)
 184                         panic("Cannot find console");
 185         } else
 186                 dev = serial_current;
 187         return dev;
 188 }
 189
 190 int serial_init(void)
 191 {
 192         return get_current()->start();
 193 }
 194
 195 void serial_setbrg(void)
 196 {
 197         get_current()->setbrg();
 198 }
 199
 200 int serial_getc(void)
 201 {
 202         return get_current()->getc();
 203 }
 204
 205 int serial_tstc(void)
 206 {
 207         return get_current()->tstc();
 208 }
 209
 210 void serial_putc(const char c)
 211 {
 212         get_current()->putc(c);
 213 }
 214
 215 void serial_puts(const char *s)
 216 {
 217         get_current()->puts(s);
 218 }
 219
 220 #if CONFIG_POST & CONFIG_SYS_POST_UART
 221 static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE;
 222
 223 /* Mark weak until post/cpu/.../uart.c migrate over */
 224 __weak
 225 int uart_post_test(int flags)
 226 {
 227         unsigned char c;
 228         int ret, saved_baud, b;
 229         struct serial_device *saved_dev, *s;
 230         bd_t *bd = gd->bd;
 231
 232         /* Save current serial state */
 233         ret = 0;
 234         saved_dev = serial_current;
 235         saved_baud = bd->bi_baudrate;
 236
 237         for (s = serial_devices; s; s = s->next) {
 238                 /* If this driver doesn't support loop back, skip it */
 239                 if (!s->loop)
 240                         continue;
 241
 242                 /* Test the next device */
 243                 serial_current = s;
 244
 245                 ret = serial_init();
 246                 if (ret)
 247                         goto done;
 248
 249                 /* Consume anything that happens to be queued */
 250                 while (serial_tstc())
 251                         serial_getc();
 252
 253                 /* Enable loop back */
 254                 s->loop(1);
 255
 256                 /* Test every available baud rate */
 257                 for (b = 0; b < ARRAY_SIZE(bauds); ++b) {
 258                         bd->bi_baudrate = bauds[b];
 259                         serial_setbrg();
 260
 261                         /*
 262                          * Stick to printable chars to avoid issues:
 263                          *  - terminal corruption
 264                          *  - serial program reacting to sequences and sending
 265                          *    back random extra data
 266                          *  - most serial drivers add in extra chars (like \r\n)
 267                          */
 268                         for (c = 0x20; c < 0x7f; ++c) {
 269                                 /* Send it out */
 270                                 serial_putc(c);
 271
 272                                 /* Make sure it's the same one */
 273                                 ret = (c != serial_getc());
 274                                 if (ret) {
 275                                         s->loop(0);
 276                                         goto done;
 277                                 }
 278
 279                                 /* Clean up the output in case it was sent */
 280                                 serial_putc('\b');
 281                                 ret = ('\b' != serial_getc());
 282                                 if (ret) {
 283                                         s->loop(0);
 284                                         goto done;
 285                                 }
 286                         }
 287                 }
 288
 289                 /* Disable loop back */
 290                 s->loop(0);
 291
 292                 /* XXX: There is no serial_stop() !? */
 293                 if (s->stop)
 294                         s->stop();
 295         }
 296
 297  done:
 298         /* Restore previous serial state */
 299         serial_current = saved_dev;
 300         bd->bi_baudrate = saved_baud;
 301         serial_reinit_all();
 302         serial_setbrg();
 303
 304         return ret;
 305 }
 306 #endif