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
  68 void serial_register(struct serial_device *dev)
  69 {
  70 #ifdef CONFIG_NEEDS_MANUAL_RELOC
  71         dev->start += gd->reloc_off;
  72         dev->setbrg += gd->reloc_off;
  73         dev->getc += gd->reloc_off;
  74         dev->tstc += gd->reloc_off;
  75         dev->putc += gd->reloc_off;
  76         dev->puts += gd->reloc_off;
  77 #endif
  78
  79         dev->next = serial_devices;
  80         serial_devices = dev;
  81 }
  82
  83 void serial_initialize(void)
  84 {
  85         mpc8xx_serial_initialize();
  86         ns16550_serial_initialize();
  87         pxa_serial_initialize();
  88         s3c24xx_serial_initialize();
  89         s5p_serial_initialize();
  90         mpc512x_serial_initialize();
  91         bfin_serial_initialize();
  92         bfin_jtag_initialize();
  93         uartlite_serial_initialize();
  94         zynq_serial_initalize();
  95         au1x00_serial_initialize();
  96         asc_serial_initialize();
  97         jz_serial_initialize();
  98         mpc5xx_serial_initialize();
  99         mpc8220_serial_initialize();
 100         mpc8260_scc_serial_initialize();
 101         mpc8260_smc_serial_initialize();
 102         mpc85xx_serial_initialize();
 103         iop480_serial_initialize();
 104         leon2_serial_initialize();
 105         leon3_serial_initialize();
 106         marvell_serial_initialize();
 107         amirix_serial_initialize();
 108         bmw_serial_initialize();
 109
 110         serial_assign(default_serial_console()->name);
 111 }
 112
 113 void serial_stdio_init(void)
 114 {
 115         struct stdio_dev dev;
 116         struct serial_device *s = serial_devices;
 117
 118         while (s) {
 119                 memset(&dev, 0, sizeof(dev));
 120
 121                 strcpy(dev.name, s->name);
 122                 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
 123
 124                 dev.start = s->start;
 125                 dev.stop = s->stop;
 126                 dev.putc = s->putc;
 127                 dev.puts = s->puts;
 128                 dev.getc = s->getc;
 129                 dev.tstc = s->tstc;
 130
 131                 stdio_register(&dev);
 132
 133                 s = s->next;
 134         }
 135 }
 136
 137 int serial_assign(const char *name)
 138 {
 139         struct serial_device *s;
 140
 141         for (s = serial_devices; s; s = s->next) {
 142                 if (strcmp(s->name, name) == 0) {
 143                         serial_current = s;
 144                         return 0;
 145                 }
 146         }
 147
 148         return 1;
 149 }
 150
 151 void serial_reinit_all(void)
 152 {
 153         struct serial_device *s;
 154
 155         for (s = serial_devices; s; s = s->next)
 156                 s->start();
 157 }
 158
 159 static struct serial_device *get_current(void)
 160 {
 161         struct serial_device *dev;
 162
 163         if (!(gd->flags & GD_FLG_RELOC) || !serial_current) {
 164                 dev = default_serial_console();
 165
 166                 /* We must have a console device */
 167                 if (!dev)
 168                         panic("Cannot find console");
 169         } else
 170                 dev = serial_current;
 171         return dev;
 172 }
 173
 174 int serial_init(void)
 175 {
 176         return get_current()->start();
 177 }
 178
 179 void serial_setbrg(void)
 180 {
 181         get_current()->setbrg();
 182 }
 183
 184 int serial_getc(void)
 185 {
 186         return get_current()->getc();
 187 }
 188
 189 int serial_tstc(void)
 190 {
 191         return get_current()->tstc();
 192 }
 193
 194 void serial_putc(const char c)
 195 {
 196         get_current()->putc(c);
 197 }
 198
 199 void serial_puts(const char *s)
 200 {
 201         get_current()->puts(s);
 202 }
 203
 204 #if CONFIG_POST & CONFIG_SYS_POST_UART
 205 static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE;
 206
 207 /* Mark weak until post/cpu/.../uart.c migrate over */
 208 __weak
 209 int uart_post_test(int flags)
 210 {
 211         unsigned char c;
 212         int ret, saved_baud, b;
 213         struct serial_device *saved_dev, *s;
 214         bd_t *bd = gd->bd;
 215
 216         /* Save current serial state */
 217         ret = 0;
 218         saved_dev = serial_current;
 219         saved_baud = bd->bi_baudrate;
 220
 221         for (s = serial_devices; s; s = s->next) {
 222                 /* If this driver doesn't support loop back, skip it */
 223                 if (!s->loop)
 224                         continue;
 225
 226                 /* Test the next device */
 227                 serial_current = s;
 228
 229                 ret = serial_init();
 230                 if (ret)
 231                         goto done;
 232
 233                 /* Consume anything that happens to be queued */
 234                 while (serial_tstc())
 235                         serial_getc();
 236
 237                 /* Enable loop back */
 238                 s->loop(1);
 239
 240                 /* Test every available baud rate */
 241                 for (b = 0; b < ARRAY_SIZE(bauds); ++b) {
 242                         bd->bi_baudrate = bauds[b];
 243                         serial_setbrg();
 244
 245                         /*
 246                          * Stick to printable chars to avoid issues:
 247                          *  - terminal corruption
 248                          *  - serial program reacting to sequences and sending
 249                          *    back random extra data
 250                          *  - most serial drivers add in extra chars (like \r\n)
 251                          */
 252                         for (c = 0x20; c < 0x7f; ++c) {
 253                                 /* Send it out */
 254                                 serial_putc(c);
 255
 256                                 /* Make sure it's the same one */
 257                                 ret = (c != serial_getc());
 258                                 if (ret) {
 259                                         s->loop(0);
 260                                         goto done;
 261                                 }
 262
 263                                 /* Clean up the output in case it was sent */
 264                                 serial_putc('\b');
 265                                 ret = ('\b' != serial_getc());
 266                                 if (ret) {
 267                                         s->loop(0);
 268                                         goto done;
 269                                 }
 270                         }
 271                 }
 272
 273                 /* Disable loop back */
 274                 s->loop(0);
 275
 276                 /* XXX: There is no serial_stop() !? */
 277                 if (s->stop)
 278                         s->stop();
 279         }
 280
 281  done:
 282         /* Restore previous serial state */
 283         serial_current = saved_dev;
 284         bd->bi_baudrate = saved_baud;
 285         serial_reinit_all();
 286         serial_setbrg();
 287
 288         return ret;
 289 }
 290 #endif