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
  56 void serial_register(struct serial_device *dev)
  57 {
  58 #ifdef CONFIG_NEEDS_MANUAL_RELOC
  59         dev->start += gd->reloc_off;
  60         dev->setbrg += gd->reloc_off;
  61         dev->getc += gd->reloc_off;
  62         dev->tstc += gd->reloc_off;
  63         dev->putc += gd->reloc_off;
  64         dev->puts += gd->reloc_off;
  65 #endif
  66
  67         dev->next = serial_devices;
  68         serial_devices = dev;
  69 }
  70
  71 void serial_initialize(void)
  72 {
  73         mpc8xx_serial_initialize();
  74         ns16550_serial_initialize();
  75         pxa_serial_initialize();
  76         s3c24xx_serial_initialize();
  77         s5p_serial_initialize();
  78         mpc512x_serial_initialize();
  79         bfin_serial_initialize();
  80         bfin_jtag_initialize();
  81         uartlite_serial_initialize();
  82         zynq_serial_initalize();
  83         au1x00_serial_initialize();
  84         asc_serial_initialize();
  85
  86         serial_assign(default_serial_console()->name);
  87 }
  88
  89 void serial_stdio_init(void)
  90 {
  91         struct stdio_dev dev;
  92         struct serial_device *s = serial_devices;
  93
  94         while (s) {
  95                 memset(&dev, 0, sizeof(dev));
  96
  97                 strcpy(dev.name, s->name);
  98                 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
  99
 100                 dev.start = s->start;
 101                 dev.stop = s->stop;
 102                 dev.putc = s->putc;
 103                 dev.puts = s->puts;
 104                 dev.getc = s->getc;
 105                 dev.tstc = s->tstc;
 106
 107                 stdio_register(&dev);
 108
 109                 s = s->next;
 110         }
 111 }
 112
 113 int serial_assign(const char *name)
 114 {
 115         struct serial_device *s;
 116
 117         for (s = serial_devices; s; s = s->next) {
 118                 if (strcmp(s->name, name) == 0) {
 119                         serial_current = s;
 120                         return 0;
 121                 }
 122         }
 123
 124         return 1;
 125 }
 126
 127 void serial_reinit_all(void)
 128 {
 129         struct serial_device *s;
 130
 131         for (s = serial_devices; s; s = s->next)
 132                 s->start();
 133 }
 134
 135 static struct serial_device *get_current(void)
 136 {
 137         struct serial_device *dev;
 138
 139         if (!(gd->flags & GD_FLG_RELOC) || !serial_current) {
 140                 dev = default_serial_console();
 141
 142                 /* We must have a console device */
 143                 if (!dev)
 144                         panic("Cannot find console");
 145         } else
 146                 dev = serial_current;
 147         return dev;
 148 }
 149
 150 int serial_init(void)
 151 {
 152         return get_current()->start();
 153 }
 154
 155 void serial_setbrg(void)
 156 {
 157         get_current()->setbrg();
 158 }
 159
 160 int serial_getc(void)
 161 {
 162         return get_current()->getc();
 163 }
 164
 165 int serial_tstc(void)
 166 {
 167         return get_current()->tstc();
 168 }
 169
 170 void serial_putc(const char c)
 171 {
 172         get_current()->putc(c);
 173 }
 174
 175 void serial_puts(const char *s)
 176 {
 177         get_current()->puts(s);
 178 }
 179
 180 #if CONFIG_POST & CONFIG_SYS_POST_UART
 181 static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE;
 182
 183 /* Mark weak until post/cpu/.../uart.c migrate over */
 184 __weak
 185 int uart_post_test(int flags)
 186 {
 187         unsigned char c;
 188         int ret, saved_baud, b;
 189         struct serial_device *saved_dev, *s;
 190         bd_t *bd = gd->bd;
 191
 192         /* Save current serial state */
 193         ret = 0;
 194         saved_dev = serial_current;
 195         saved_baud = bd->bi_baudrate;
 196
 197         for (s = serial_devices; s; s = s->next) {
 198                 /* If this driver doesn't support loop back, skip it */
 199                 if (!s->loop)
 200                         continue;
 201
 202                 /* Test the next device */
 203                 serial_current = s;
 204
 205                 ret = serial_init();
 206                 if (ret)
 207                         goto done;
 208
 209                 /* Consume anything that happens to be queued */
 210                 while (serial_tstc())
 211                         serial_getc();
 212
 213                 /* Enable loop back */
 214                 s->loop(1);
 215
 216                 /* Test every available baud rate */
 217                 for (b = 0; b < ARRAY_SIZE(bauds); ++b) {
 218                         bd->bi_baudrate = bauds[b];
 219                         serial_setbrg();
 220
 221                         /*
 222                          * Stick to printable chars to avoid issues:
 223                          *  - terminal corruption
 224                          *  - serial program reacting to sequences and sending
 225                          *    back random extra data
 226                          *  - most serial drivers add in extra chars (like \r\n)
 227                          */
 228                         for (c = 0x20; c < 0x7f; ++c) {
 229                                 /* Send it out */
 230                                 serial_putc(c);
 231
 232                                 /* Make sure it's the same one */
 233                                 ret = (c != serial_getc());
 234                                 if (ret) {
 235                                         s->loop(0);
 236                                         goto done;
 237                                 }
 238
 239                                 /* Clean up the output in case it was sent */
 240                                 serial_putc('\b');
 241                                 ret = ('\b' != serial_getc());
 242                                 if (ret) {
 243                                         s->loop(0);
 244                                         goto done;
 245                                 }
 246                         }
 247                 }
 248
 249                 /* Disable loop back */
 250                 s->loop(0);
 251
 252                 /* XXX: There is no serial_stop() !? */
 253                 if (s->stop)
 254                         s->stop();
 255         }
 256
 257  done:
 258         /* Restore previous serial state */
 259         serial_current = saved_dev;
 260         bd->bi_baudrate = saved_baud;
 261         serial_reinit_all();
 262         serial_setbrg();
 263
 264         return ret;
 265 }
 266 #endif