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
  79 void serial_register(struct serial_device *dev)
  80 {
  81 #ifdef CONFIG_NEEDS_MANUAL_RELOC
  82         dev->start += gd->reloc_off;
  83         dev->setbrg += gd->reloc_off;
  84         dev->getc += gd->reloc_off;
  85         dev->tstc += gd->reloc_off;
  86         dev->putc += gd->reloc_off;
  87         dev->puts += gd->reloc_off;
  88 #endif
  89
  90         dev->next = serial_devices;
  91         serial_devices = dev;
  92 }
  93
  94 void serial_initialize(void)
  95 {
  96         mpc8xx_serial_initialize();
  97         ns16550_serial_initialize();
  98         pxa_serial_initialize();
  99         s3c24xx_serial_initialize();
 100         s5p_serial_initialize();
 101         mpc512x_serial_initialize();
 102         bfin_serial_initialize();
 103         bfin_jtag_initialize();
 104         uartlite_serial_initialize();
 105         zynq_serial_initalize();
 106         au1x00_serial_initialize();
 107         asc_serial_initialize();
 108         jz_serial_initialize();
 109         mpc5xx_serial_initialize();
 110         mpc8220_serial_initialize();
 111         mpc8260_scc_serial_initialize();
 112         mpc8260_smc_serial_initialize();
 113         mpc85xx_serial_initialize();
 114         iop480_serial_initialize();
 115         leon2_serial_initialize();
 116         leon3_serial_initialize();
 117         marvell_serial_initialize();
 118         amirix_serial_initialize();
 119         bmw_serial_initialize();
 120         cogent_serial_initialize();
 121         cpci750_serial_initialize();
 122         evb64260_serial_initialize();
 123         ml2_serial_initialize();
 124         sconsole_serial_initialize();
 125         p3mx_serial_initialize();
 126         altera_jtag_serial_initialize();
 127         altera_serial_initialize();
 128         atmel_serial_initialize();
 129         lpc32xx_serial_initialize();
 130         mcf_serial_initialize();
 131
 132         serial_assign(default_serial_console()->name);
 133 }
 134
 135 void serial_stdio_init(void)
 136 {
 137         struct stdio_dev dev;
 138         struct serial_device *s = serial_devices;
 139
 140         while (s) {
 141                 memset(&dev, 0, sizeof(dev));
 142
 143                 strcpy(dev.name, s->name);
 144                 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
 145
 146                 dev.start = s->start;
 147                 dev.stop = s->stop;
 148                 dev.putc = s->putc;
 149                 dev.puts = s->puts;
 150                 dev.getc = s->getc;
 151                 dev.tstc = s->tstc;
 152
 153                 stdio_register(&dev);
 154
 155                 s = s->next;
 156         }
 157 }
 158
 159 int serial_assign(const char *name)
 160 {
 161         struct serial_device *s;
 162
 163         for (s = serial_devices; s; s = s->next) {
 164                 if (strcmp(s->name, name) == 0) {
 165                         serial_current = s;
 166                         return 0;
 167                 }
 168         }
 169
 170         return 1;
 171 }
 172
 173 void serial_reinit_all(void)
 174 {
 175         struct serial_device *s;
 176
 177         for (s = serial_devices; s; s = s->next)
 178                 s->start();
 179 }
 180
 181 static struct serial_device *get_current(void)
 182 {
 183         struct serial_device *dev;
 184
 185         if (!(gd->flags & GD_FLG_RELOC) || !serial_current) {
 186                 dev = default_serial_console();
 187
 188                 /* We must have a console device */
 189                 if (!dev)
 190                         panic("Cannot find console");
 191         } else
 192                 dev = serial_current;
 193         return dev;
 194 }
 195
 196 int serial_init(void)
 197 {
 198         return get_current()->start();
 199 }
 200
 201 void serial_setbrg(void)
 202 {
 203         get_current()->setbrg();
 204 }
 205
 206 int serial_getc(void)
 207 {
 208         return get_current()->getc();
 209 }
 210
 211 int serial_tstc(void)
 212 {
 213         return get_current()->tstc();
 214 }
 215
 216 void serial_putc(const char c)
 217 {
 218         get_current()->putc(c);
 219 }
 220
 221 void serial_puts(const char *s)
 222 {
 223         get_current()->puts(s);
 224 }
 225
 226 #if CONFIG_POST & CONFIG_SYS_POST_UART
 227 static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE;
 228
 229 /* Mark weak until post/cpu/.../uart.c migrate over */
 230 __weak
 231 int uart_post_test(int flags)
 232 {
 233         unsigned char c;
 234         int ret, saved_baud, b;
 235         struct serial_device *saved_dev, *s;
 236         bd_t *bd = gd->bd;
 237
 238         /* Save current serial state */
 239         ret = 0;
 240         saved_dev = serial_current;
 241         saved_baud = bd->bi_baudrate;
 242
 243         for (s = serial_devices; s; s = s->next) {
 244                 /* If this driver doesn't support loop back, skip it */
 245                 if (!s->loop)
 246                         continue;
 247
 248                 /* Test the next device */
 249                 serial_current = s;
 250
 251                 ret = serial_init();
 252                 if (ret)
 253                         goto done;
 254
 255                 /* Consume anything that happens to be queued */
 256                 while (serial_tstc())
 257                         serial_getc();
 258
 259                 /* Enable loop back */
 260                 s->loop(1);
 261
 262                 /* Test every available baud rate */
 263                 for (b = 0; b < ARRAY_SIZE(bauds); ++b) {
 264                         bd->bi_baudrate = bauds[b];
 265                         serial_setbrg();
 266
 267                         /*
 268                          * Stick to printable chars to avoid issues:
 269                          *  - terminal corruption
 270                          *  - serial program reacting to sequences and sending
 271                          *    back random extra data
 272                          *  - most serial drivers add in extra chars (like \r\n)
 273                          */
 274                         for (c = 0x20; c < 0x7f; ++c) {
 275                                 /* Send it out */
 276                                 serial_putc(c);
 277
 278                                 /* Make sure it's the same one */
 279                                 ret = (c != serial_getc());
 280                                 if (ret) {
 281                                         s->loop(0);
 282                                         goto done;
 283                                 }
 284
 285                                 /* Clean up the output in case it was sent */
 286                                 serial_putc('\b');
 287                                 ret = ('\b' != serial_getc());
 288                                 if (ret) {
 289                                         s->loop(0);
 290                                         goto done;
 291                                 }
 292                         }
 293                 }
 294
 295                 /* Disable loop back */
 296                 s->loop(0);
 297
 298                 /* XXX: There is no serial_stop() !? */
 299                 if (s->stop)
 300                         s->stop();
 301         }
 302
 303  done:
 304         /* Restore previous serial state */
 305         serial_current = saved_dev;
 306         bd->bi_baudrate = saved_baud;
 307         serial_reinit_all();
 308         serial_setbrg();
 309
 310         return ret;
 311 }
 312 #endif