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