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
  67 void serial_register(struct serial_device *dev)
  68 {
  69 #ifdef CONFIG_NEEDS_MANUAL_RELOC
  70         dev->start += gd->reloc_off;
  71         dev->setbrg += gd->reloc_off;
  72         dev->getc += gd->reloc_off;
  73         dev->tstc += gd->reloc_off;
  74         dev->putc += gd->reloc_off;
  75         dev->puts += gd->reloc_off;
  76 #endif
  77
  78         dev->next = serial_devices;
  79         serial_devices = dev;
  80 }
  81
  82 void serial_initialize(void)
  83 {
  84         mpc8xx_serial_initialize();
  85         ns16550_serial_initialize();
  86         pxa_serial_initialize();
  87         s3c24xx_serial_initialize();
  88         s5p_serial_initialize();
  89         mpc512x_serial_initialize();
  90         bfin_serial_initialize();
  91         bfin_jtag_initialize();
  92         uartlite_serial_initialize();
  93         zynq_serial_initalize();
  94         au1x00_serial_initialize();
  95         asc_serial_initialize();
  96         jz_serial_initialize();
  97         mpc5xx_serial_initialize();
  98         mpc8220_serial_initialize();
  99         mpc8260_scc_serial_initialize();
 100         mpc8260_smc_serial_initialize();
 101         mpc85xx_serial_initialize();
 102         iop480_serial_initialize();
 103         leon2_serial_initialize();
 104         leon3_serial_initialize();
 105         marvell_serial_initialize();
 106         amirix_serial_initialize();
 107
 108         serial_assign(default_serial_console()->name);
 109 }
 110
 111 void serial_stdio_init(void)
 112 {
 113         struct stdio_dev dev;
 114         struct serial_device *s = serial_devices;
 115
 116         while (s) {
 117                 memset(&dev, 0, sizeof(dev));
 118
 119                 strcpy(dev.name, s->name);
 120                 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
 121
 122                 dev.start = s->start;
 123                 dev.stop = s->stop;
 124                 dev.putc = s->putc;
 125                 dev.puts = s->puts;
 126                 dev.getc = s->getc;
 127                 dev.tstc = s->tstc;
 128
 129                 stdio_register(&dev);
 130
 131                 s = s->next;
 132         }
 133 }
 134
 135 int serial_assign(const char *name)
 136 {
 137         struct serial_device *s;
 138
 139         for (s = serial_devices; s; s = s->next) {
 140                 if (strcmp(s->name, name) == 0) {
 141                         serial_current = s;
 142                         return 0;
 143                 }
 144         }
 145
 146         return 1;
 147 }
 148
 149 void serial_reinit_all(void)
 150 {
 151         struct serial_device *s;
 152
 153         for (s = serial_devices; s; s = s->next)
 154                 s->start();
 155 }
 156
 157 static struct serial_device *get_current(void)
 158 {
 159         struct serial_device *dev;
 160
 161         if (!(gd->flags & GD_FLG_RELOC) || !serial_current) {
 162                 dev = default_serial_console();
 163
 164                 /* We must have a console device */
 165                 if (!dev)
 166                         panic("Cannot find console");
 167         } else
 168                 dev = serial_current;
 169         return dev;
 170 }
 171
 172 int serial_init(void)
 173 {
 174         return get_current()->start();
 175 }
 176
 177 void serial_setbrg(void)
 178 {
 179         get_current()->setbrg();
 180 }
 181
 182 int serial_getc(void)
 183 {
 184         return get_current()->getc();
 185 }
 186
 187 int serial_tstc(void)
 188 {
 189         return get_current()->tstc();
 190 }
 191
 192 void serial_putc(const char c)
 193 {
 194         get_current()->putc(c);
 195 }
 196
 197 void serial_puts(const char *s)
 198 {
 199         get_current()->puts(s);
 200 }
 201
 202 #if CONFIG_POST & CONFIG_SYS_POST_UART
 203 static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE;
 204
 205 /* Mark weak until post/cpu/.../uart.c migrate over */
 206 __weak
 207 int uart_post_test(int flags)
 208 {
 209         unsigned char c;
 210         int ret, saved_baud, b;
 211         struct serial_device *saved_dev, *s;
 212         bd_t *bd = gd->bd;
 213
 214         /* Save current serial state */
 215         ret = 0;
 216         saved_dev = serial_current;
 217         saved_baud = bd->bi_baudrate;
 218
 219         for (s = serial_devices; s; s = s->next) {
 220                 /* If this driver doesn't support loop back, skip it */
 221                 if (!s->loop)
 222                         continue;
 223
 224                 /* Test the next device */
 225                 serial_current = s;
 226
 227                 ret = serial_init();
 228                 if (ret)
 229                         goto done;
 230
 231                 /* Consume anything that happens to be queued */
 232                 while (serial_tstc())
 233                         serial_getc();
 234
 235                 /* Enable loop back */
 236                 s->loop(1);
 237
 238                 /* Test every available baud rate */
 239                 for (b = 0; b < ARRAY_SIZE(bauds); ++b) {
 240                         bd->bi_baudrate = bauds[b];
 241                         serial_setbrg();
 242
 243                         /*
 244                          * Stick to printable chars to avoid issues:
 245                          *  - terminal corruption
 246                          *  - serial program reacting to sequences and sending
 247                          *    back random extra data
 248                          *  - most serial drivers add in extra chars (like \r\n)
 249                          */
 250                         for (c = 0x20; c < 0x7f; ++c) {
 251                                 /* Send it out */
 252                                 serial_putc(c);
 253
 254                                 /* Make sure it's the same one */
 255                                 ret = (c != serial_getc());
 256                                 if (ret) {
 257                                         s->loop(0);
 258                                         goto done;
 259                                 }
 260
 261                                 /* Clean up the output in case it was sent */
 262                                 serial_putc('\b');
 263                                 ret = ('\b' != serial_getc());
 264                                 if (ret) {
 265                                         s->loop(0);
 266                                         goto done;
 267                                 }
 268                         }
 269                 }
 270
 271                 /* Disable loop back */
 272                 s->loop(0);
 273
 274                 /* XXX: There is no serial_stop() !? */
 275                 if (s->stop)
 276                         s->stop();
 277         }
 278
 279  done:
 280         /* Restore previous serial state */
 281         serial_current = saved_dev;
 282         bd->bi_baudrate = saved_baud;
 283         serial_reinit_all();
 284         serial_setbrg();
 285
 286         return ret;
 287 }
 288 #endif