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
  64 void serial_register(struct serial_device *dev)
  65 {
  66 #ifdef CONFIG_NEEDS_MANUAL_RELOC
  67         dev->start += gd->reloc_off;
  68         dev->setbrg += gd->reloc_off;
  69         dev->getc += gd->reloc_off;
  70         dev->tstc += gd->reloc_off;
  71         dev->putc += gd->reloc_off;
  72         dev->puts += gd->reloc_off;
  73 #endif
  74
  75         dev->next = serial_devices;
  76         serial_devices = dev;
  77 }
  78
  79 void serial_initialize(void)
  80 {
  81         mpc8xx_serial_initialize();
  82         ns16550_serial_initialize();
  83         pxa_serial_initialize();
  84         s3c24xx_serial_initialize();
  85         s5p_serial_initialize();
  86         mpc512x_serial_initialize();
  87         bfin_serial_initialize();
  88         bfin_jtag_initialize();
  89         uartlite_serial_initialize();
  90         zynq_serial_initalize();
  91         au1x00_serial_initialize();
  92         asc_serial_initialize();
  93         jz_serial_initialize();
  94         mpc5xx_serial_initialize();
  95         mpc8220_serial_initialize();
  96         mpc8260_scc_serial_initialize();
  97         mpc8260_smc_serial_initialize();
  98         mpc85xx_serial_initialize();
  99         iop480_serial_initialize();
 100         leon2_serial_initialize();
 101
 102         serial_assign(default_serial_console()->name);
 103 }
 104
 105 void serial_stdio_init(void)
 106 {
 107         struct stdio_dev dev;
 108         struct serial_device *s = serial_devices;
 109
 110         while (s) {
 111                 memset(&dev, 0, sizeof(dev));
 112
 113                 strcpy(dev.name, s->name);
 114                 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
 115
 116                 dev.start = s->start;
 117                 dev.stop = s->stop;
 118                 dev.putc = s->putc;
 119                 dev.puts = s->puts;
 120                 dev.getc = s->getc;
 121                 dev.tstc = s->tstc;
 122
 123                 stdio_register(&dev);
 124
 125                 s = s->next;
 126         }
 127 }
 128
 129 int serial_assign(const char *name)
 130 {
 131         struct serial_device *s;
 132
 133         for (s = serial_devices; s; s = s->next) {
 134                 if (strcmp(s->name, name) == 0) {
 135                         serial_current = s;
 136                         return 0;
 137                 }
 138         }
 139
 140         return 1;
 141 }
 142
 143 void serial_reinit_all(void)
 144 {
 145         struct serial_device *s;
 146
 147         for (s = serial_devices; s; s = s->next)
 148                 s->start();
 149 }
 150
 151 static struct serial_device *get_current(void)
 152 {
 153         struct serial_device *dev;
 154
 155         if (!(gd->flags & GD_FLG_RELOC) || !serial_current) {
 156                 dev = default_serial_console();
 157
 158                 /* We must have a console device */
 159                 if (!dev)
 160                         panic("Cannot find console");
 161         } else
 162                 dev = serial_current;
 163         return dev;
 164 }
 165
 166 int serial_init(void)
 167 {
 168         return get_current()->start();
 169 }
 170
 171 void serial_setbrg(void)
 172 {
 173         get_current()->setbrg();
 174 }
 175
 176 int serial_getc(void)
 177 {
 178         return get_current()->getc();
 179 }
 180
 181 int serial_tstc(void)
 182 {
 183         return get_current()->tstc();
 184 }
 185
 186 void serial_putc(const char c)
 187 {
 188         get_current()->putc(c);
 189 }
 190
 191 void serial_puts(const char *s)
 192 {
 193         get_current()->puts(s);
 194 }
 195
 196 #if CONFIG_POST & CONFIG_SYS_POST_UART
 197 static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE;
 198
 199 /* Mark weak until post/cpu/.../uart.c migrate over */
 200 __weak
 201 int uart_post_test(int flags)
 202 {
 203         unsigned char c;
 204         int ret, saved_baud, b;
 205         struct serial_device *saved_dev, *s;
 206         bd_t *bd = gd->bd;
 207
 208         /* Save current serial state */
 209         ret = 0;
 210         saved_dev = serial_current;
 211         saved_baud = bd->bi_baudrate;
 212
 213         for (s = serial_devices; s; s = s->next) {
 214                 /* If this driver doesn't support loop back, skip it */
 215                 if (!s->loop)
 216                         continue;
 217
 218                 /* Test the next device */
 219                 serial_current = s;
 220
 221                 ret = serial_init();
 222                 if (ret)
 223                         goto done;
 224
 225                 /* Consume anything that happens to be queued */
 226                 while (serial_tstc())
 227                         serial_getc();
 228
 229                 /* Enable loop back */
 230                 s->loop(1);
 231
 232                 /* Test every available baud rate */
 233                 for (b = 0; b < ARRAY_SIZE(bauds); ++b) {
 234                         bd->bi_baudrate = bauds[b];
 235                         serial_setbrg();
 236
 237                         /*
 238                          * Stick to printable chars to avoid issues:
 239                          *  - terminal corruption
 240                          *  - serial program reacting to sequences and sending
 241                          *    back random extra data
 242                          *  - most serial drivers add in extra chars (like \r\n)
 243                          */
 244                         for (c = 0x20; c < 0x7f; ++c) {
 245                                 /* Send it out */
 246                                 serial_putc(c);
 247
 248                                 /* Make sure it's the same one */
 249                                 ret = (c != serial_getc());
 250                                 if (ret) {
 251                                         s->loop(0);
 252                                         goto done;
 253                                 }
 254
 255                                 /* Clean up the output in case it was sent */
 256                                 serial_putc('\b');
 257                                 ret = ('\b' != serial_getc());
 258                                 if (ret) {
 259                                         s->loop(0);
 260                                         goto done;
 261                                 }
 262                         }
 263                 }
 264
 265                 /* Disable loop back */
 266                 s->loop(0);
 267
 268                 /* XXX: There is no serial_stop() !? */
 269                 if (s->stop)
 270                         s->stop();
 271         }
 272
 273  done:
 274         /* Restore previous serial state */
 275         serial_current = saved_dev;
 276         bd->bi_baudrate = saved_baud;
 277         serial_reinit_all();
 278         serial_setbrg();
 279
 280         return ret;
 281 }
 282 #endif