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