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
  77 void serial_register(struct serial_device *dev)
  78 {
  79 #ifdef CONFIG_NEEDS_MANUAL_RELOC
  80         dev->start += gd->reloc_off;
  81         dev->setbrg += gd->reloc_off;
  82         dev->getc += gd->reloc_off;
  83         dev->tstc += gd->reloc_off;
  84         dev->putc += gd->reloc_off;
  85         dev->puts += gd->reloc_off;
  86 #endif
  87
  88         dev->next = serial_devices;
  89         serial_devices = dev;
  90 }
  91
  92 void serial_initialize(void)
  93 {
  94         mpc8xx_serial_initialize();
  95         ns16550_serial_initialize();
  96         pxa_serial_initialize();
  97         s3c24xx_serial_initialize();
  98         s5p_serial_initialize();
  99         mpc512x_serial_initialize();
 100         bfin_serial_initialize();
 101         bfin_jtag_initialize();
 102         uartlite_serial_initialize();
 103         zynq_serial_initalize();
 104         au1x00_serial_initialize();
 105         asc_serial_initialize();
 106         jz_serial_initialize();
 107         mpc5xx_serial_initialize();
 108         mpc8220_serial_initialize();
 109         mpc8260_scc_serial_initialize();
 110         mpc8260_smc_serial_initialize();
 111         mpc85xx_serial_initialize();
 112         iop480_serial_initialize();
 113         leon2_serial_initialize();
 114         leon3_serial_initialize();
 115         marvell_serial_initialize();
 116         amirix_serial_initialize();
 117         bmw_serial_initialize();
 118         cogent_serial_initialize();
 119         cpci750_serial_initialize();
 120         evb64260_serial_initialize();
 121         ml2_serial_initialize();
 122         sconsole_serial_initialize();
 123         p3mx_serial_initialize();
 124         altera_jtag_serial_initialize();
 125         altera_serial_initialize();
 126         atmel_serial_initialize();
 127
 128         serial_assign(default_serial_console()->name);
 129 }
 130
 131 void serial_stdio_init(void)
 132 {
 133         struct stdio_dev dev;
 134         struct serial_device *s = serial_devices;
 135
 136         while (s) {
 137                 memset(&dev, 0, sizeof(dev));
 138
 139                 strcpy(dev.name, s->name);
 140                 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
 141
 142                 dev.start = s->start;
 143                 dev.stop = s->stop;
 144                 dev.putc = s->putc;
 145                 dev.puts = s->puts;
 146                 dev.getc = s->getc;
 147                 dev.tstc = s->tstc;
 148
 149                 stdio_register(&dev);
 150
 151                 s = s->next;
 152         }
 153 }
 154
 155 int serial_assign(const char *name)
 156 {
 157         struct serial_device *s;
 158
 159         for (s = serial_devices; s; s = s->next) {
 160                 if (strcmp(s->name, name) == 0) {
 161                         serial_current = s;
 162                         return 0;
 163                 }
 164         }
 165
 166         return 1;
 167 }
 168
 169 void serial_reinit_all(void)
 170 {
 171         struct serial_device *s;
 172
 173         for (s = serial_devices; s; s = s->next)
 174                 s->start();
 175 }
 176
 177 static struct serial_device *get_current(void)
 178 {
 179         struct serial_device *dev;
 180
 181         if (!(gd->flags & GD_FLG_RELOC) || !serial_current) {
 182                 dev = default_serial_console();
 183
 184                 /* We must have a console device */
 185                 if (!dev)
 186                         panic("Cannot find console");
 187         } else
 188                 dev = serial_current;
 189         return dev;
 190 }
 191
 192 int serial_init(void)
 193 {
 194         return get_current()->start();
 195 }
 196
 197 void serial_setbrg(void)
 198 {
 199         get_current()->setbrg();
 200 }
 201
 202 int serial_getc(void)
 203 {
 204         return get_current()->getc();
 205 }
 206
 207 int serial_tstc(void)
 208 {
 209         return get_current()->tstc();
 210 }
 211
 212 void serial_putc(const char c)
 213 {
 214         get_current()->putc(c);
 215 }
 216
 217 void serial_puts(const char *s)
 218 {
 219         get_current()->puts(s);
 220 }
 221
 222 #if CONFIG_POST & CONFIG_SYS_POST_UART
 223 static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE;
 224
 225 /* Mark weak until post/cpu/.../uart.c migrate over */
 226 __weak
 227 int uart_post_test(int flags)
 228 {
 229         unsigned char c;
 230         int ret, saved_baud, b;
 231         struct serial_device *saved_dev, *s;
 232         bd_t *bd = gd->bd;
 233
 234         /* Save current serial state */
 235         ret = 0;
 236         saved_dev = serial_current;
 237         saved_baud = bd->bi_baudrate;
 238
 239         for (s = serial_devices; s; s = s->next) {
 240                 /* If this driver doesn't support loop back, skip it */
 241                 if (!s->loop)
 242                         continue;
 243
 244                 /* Test the next device */
 245                 serial_current = s;
 246
 247                 ret = serial_init();
 248                 if (ret)
 249                         goto done;
 250
 251                 /* Consume anything that happens to be queued */
 252                 while (serial_tstc())
 253                         serial_getc();
 254
 255                 /* Enable loop back */
 256                 s->loop(1);
 257
 258                 /* Test every available baud rate */
 259                 for (b = 0; b < ARRAY_SIZE(bauds); ++b) {
 260                         bd->bi_baudrate = bauds[b];
 261                         serial_setbrg();
 262
 263                         /*
 264                          * Stick to printable chars to avoid issues:
 265                          *  - terminal corruption
 266                          *  - serial program reacting to sequences and sending
 267                          *    back random extra data
 268                          *  - most serial drivers add in extra chars (like \r\n)
 269                          */
 270                         for (c = 0x20; c < 0x7f; ++c) {
 271                                 /* Send it out */
 272                                 serial_putc(c);
 273
 274                                 /* Make sure it's the same one */
 275                                 ret = (c != serial_getc());
 276                                 if (ret) {
 277                                         s->loop(0);
 278                                         goto done;
 279                                 }
 280
 281                                 /* Clean up the output in case it was sent */
 282                                 serial_putc('\b');
 283                                 ret = ('\b' != serial_getc());
 284                                 if (ret) {
 285                                         s->loop(0);
 286                                         goto done;
 287                                 }
 288                         }
 289                 }
 290
 291                 /* Disable loop back */
 292                 s->loop(0);
 293
 294                 /* XXX: There is no serial_stop() !? */
 295                 if (s->stop)
 296                         s->stop();
 297         }
 298
 299  done:
 300         /* Restore previous serial state */
 301         serial_current = saved_dev;
 302         bd->bi_baudrate = saved_baud;
 303         serial_reinit_all();
 304         serial_setbrg();
 305
 306         return ret;
 307 }
 308 #endif