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(mpc512x_serial_initialize);
  50 serial_initfunc(uartlite_serial_initialize);
  51
  52 void serial_register(struct serial_device *dev)
  53 {
  54 #ifdef CONFIG_NEEDS_MANUAL_RELOC
  55         dev->start += gd->reloc_off;
  56         dev->setbrg += gd->reloc_off;
  57         dev->getc += gd->reloc_off;
  58         dev->tstc += gd->reloc_off;
  59         dev->putc += gd->reloc_off;
  60         dev->puts += gd->reloc_off;
  61 #endif
  62
  63         dev->next = serial_devices;
  64         serial_devices = dev;
  65 }
  66
  67 void serial_initialize(void)
  68 {
  69         mpc8xx_serial_initialize();
  70         ns16550_serial_initialize();
  71         pxa_serial_initialize();
  72         s3c24xx_serial_initialize();
  73         s5p_serial_initialize();
  74         mpc512x_serial_initialize();
  75 #if defined(CONFIG_SYS_BFIN_UART)
  76         serial_register_bfin_uart();
  77 #endif
  78         uartlite_serial_initialize();
  79         zynq_serial_initalize();
  80         serial_assign(default_serial_console()->name);
  81 }
  82
  83 void serial_stdio_init(void)
  84 {
  85         struct stdio_dev dev;
  86         struct serial_device *s = serial_devices;
  87
  88         while (s) {
  89                 memset(&dev, 0, sizeof(dev));
  90
  91                 strcpy(dev.name, s->name);
  92                 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
  93
  94                 dev.start = s->start;
  95                 dev.stop = s->stop;
  96                 dev.putc = s->putc;
  97                 dev.puts = s->puts;
  98                 dev.getc = s->getc;
  99                 dev.tstc = s->tstc;
 100
 101                 stdio_register(&dev);
 102
 103                 s = s->next;
 104         }
 105 }
 106
 107 int serial_assign(const char *name)
 108 {
 109         struct serial_device *s;
 110
 111         for (s = serial_devices; s; s = s->next) {
 112                 if (strcmp(s->name, name) == 0) {
 113                         serial_current = s;
 114                         return 0;
 115                 }
 116         }
 117
 118         return 1;
 119 }
 120
 121 void serial_reinit_all(void)
 122 {
 123         struct serial_device *s;
 124
 125         for (s = serial_devices; s; s = s->next)
 126                 s->start();
 127 }
 128
 129 static struct serial_device *get_current(void)
 130 {
 131         struct serial_device *dev;
 132
 133         if (!(gd->flags & GD_FLG_RELOC) || !serial_current) {
 134                 dev = default_serial_console();
 135
 136                 /* We must have a console device */
 137                 if (!dev)
 138                         panic("Cannot find console");
 139         } else
 140                 dev = serial_current;
 141         return dev;
 142 }
 143
 144 int serial_init(void)
 145 {
 146         return get_current()->start();
 147 }
 148
 149 void serial_setbrg(void)
 150 {
 151         get_current()->setbrg();
 152 }
 153
 154 int serial_getc(void)
 155 {
 156         return get_current()->getc();
 157 }
 158
 159 int serial_tstc(void)
 160 {
 161         return get_current()->tstc();
 162 }
 163
 164 void serial_putc(const char c)
 165 {
 166         get_current()->putc(c);
 167 }
 168
 169 void serial_puts(const char *s)
 170 {
 171         get_current()->puts(s);
 172 }
 173
 174 #if CONFIG_POST & CONFIG_SYS_POST_UART
 175 static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE;
 176
 177 /* Mark weak until post/cpu/.../uart.c migrate over */
 178 __weak
 179 int uart_post_test(int flags)
 180 {
 181         unsigned char c;
 182         int ret, saved_baud, b;
 183         struct serial_device *saved_dev, *s;
 184         bd_t *bd = gd->bd;
 185
 186         /* Save current serial state */
 187         ret = 0;
 188         saved_dev = serial_current;
 189         saved_baud = bd->bi_baudrate;
 190
 191         for (s = serial_devices; s; s = s->next) {
 192                 /* If this driver doesn't support loop back, skip it */
 193                 if (!s->loop)
 194                         continue;
 195
 196                 /* Test the next device */
 197                 serial_current = s;
 198
 199                 ret = serial_init();
 200                 if (ret)
 201                         goto done;
 202
 203                 /* Consume anything that happens to be queued */
 204                 while (serial_tstc())
 205                         serial_getc();
 206
 207                 /* Enable loop back */
 208                 s->loop(1);
 209
 210                 /* Test every available baud rate */
 211                 for (b = 0; b < ARRAY_SIZE(bauds); ++b) {
 212                         bd->bi_baudrate = bauds[b];
 213                         serial_setbrg();
 214
 215                         /*
 216                          * Stick to printable chars to avoid issues:
 217                          *  - terminal corruption
 218                          *  - serial program reacting to sequences and sending
 219                          *    back random extra data
 220                          *  - most serial drivers add in extra chars (like \r\n)
 221                          */
 222                         for (c = 0x20; c < 0x7f; ++c) {
 223                                 /* Send it out */
 224                                 serial_putc(c);
 225
 226                                 /* Make sure it's the same one */
 227                                 ret = (c != serial_getc());
 228                                 if (ret) {
 229                                         s->loop(0);
 230                                         goto done;
 231                                 }
 232
 233                                 /* Clean up the output in case it was sent */
 234                                 serial_putc('\b');
 235                                 ret = ('\b' != serial_getc());
 236                                 if (ret) {
 237                                         s->loop(0);
 238                                         goto done;
 239                                 }
 240                         }
 241                 }
 242
 243                 /* Disable loop back */
 244                 s->loop(0);
 245
 246                 /* XXX: There is no serial_stop() !? */
 247                 if (s->stop)
 248                         s->stop();
 249         }
 250
 251  done:
 252         /* Restore previous serial state */
 253         serial_current = saved_dev;
 254         bd->bi_baudrate = saved_baud;
 255         serial_reinit_all();
 256         serial_setbrg();
 257
 258         return ret;
 259 }
 260 #endif