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(pxa_serial_initialize);
  45 serial_initfunc(s3c24xx_serial_initialize);
  46 serial_initfunc(s5p_serial_initialize);
  47 serial_initfunc(zynq_serial_initalize);
  48
  49 void serial_register(struct serial_device *dev)
  50 {
  51 #ifdef CONFIG_NEEDS_MANUAL_RELOC
  52         dev->start += gd->reloc_off;
  53         dev->setbrg += gd->reloc_off;
  54         dev->getc += gd->reloc_off;
  55         dev->tstc += gd->reloc_off;
  56         dev->putc += gd->reloc_off;
  57         dev->puts += gd->reloc_off;
  58 #endif
  59
  60         dev->next = serial_devices;
  61         serial_devices = dev;
  62 }
  63
  64 void serial_initialize(void)
  65 {
  66         mpc8xx_serial_initialize();
  67 #if defined(CONFIG_SYS_NS16550_SERIAL)
  68 #if defined(CONFIG_SYS_NS16550_COM1)
  69         serial_register(&eserial1_device);
  70 #endif
  71 #if defined(CONFIG_SYS_NS16550_COM2)
  72         serial_register(&eserial2_device);
  73 #endif
  74 #if defined(CONFIG_SYS_NS16550_COM3)
  75         serial_register(&eserial3_device);
  76 #endif
  77 #if defined(CONFIG_SYS_NS16550_COM4)
  78         serial_register(&eserial4_device);
  79 #endif
  80 #endif /* CONFIG_SYS_NS16550_SERIAL */
  81         pxa_serial_initialize();
  82         s3c24xx_serial_initialize();
  83         s5p_serial_initialize();
  84 #if defined(CONFIG_MPC512X)
  85 #if defined(CONFIG_SYS_PSC1)
  86         serial_register(&serial1_device);
  87 #endif
  88 #if defined(CONFIG_SYS_PSC3)
  89         serial_register(&serial3_device);
  90 #endif
  91 #if defined(CONFIG_SYS_PSC4)
  92         serial_register(&serial4_device);
  93 #endif
  94 #if defined(CONFIG_SYS_PSC6)
  95         serial_register(&serial6_device);
  96 #endif
  97 #endif
  98 #if defined(CONFIG_SYS_BFIN_UART)
  99         serial_register_bfin_uart();
 100 #endif
 101 #if defined(CONFIG_XILINX_UARTLITE)
 102 # ifdef XILINX_UARTLITE_BASEADDR
 103         serial_register(&uartlite_serial0_device);
 104 # endif /* XILINX_UARTLITE_BASEADDR */
 105 # ifdef XILINX_UARTLITE_BASEADDR1
 106         serial_register(&uartlite_serial1_device);
 107 # endif /* XILINX_UARTLITE_BASEADDR1 */
 108 # ifdef XILINX_UARTLITE_BASEADDR2
 109         serial_register(&uartlite_serial2_device);
 110 # endif /* XILINX_UARTLITE_BASEADDR2 */
 111 # ifdef XILINX_UARTLITE_BASEADDR3
 112         serial_register(&uartlite_serial3_device);
 113 # endif /* XILINX_UARTLITE_BASEADDR3 */
 114 #endif /* CONFIG_XILINX_UARTLITE */
 115         zynq_serial_initalize();
 116         serial_assign(default_serial_console()->name);
 117 }
 118
 119 void serial_stdio_init(void)
 120 {
 121         struct stdio_dev dev;
 122         struct serial_device *s = serial_devices;
 123
 124         while (s) {
 125                 memset(&dev, 0, sizeof(dev));
 126
 127                 strcpy(dev.name, s->name);
 128                 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
 129
 130                 dev.start = s->start;
 131                 dev.stop = s->stop;
 132                 dev.putc = s->putc;
 133                 dev.puts = s->puts;
 134                 dev.getc = s->getc;
 135                 dev.tstc = s->tstc;
 136
 137                 stdio_register(&dev);
 138
 139                 s = s->next;
 140         }
 141 }
 142
 143 int serial_assign(const char *name)
 144 {
 145         struct serial_device *s;
 146
 147         for (s = serial_devices; s; s = s->next) {
 148                 if (strcmp(s->name, name) == 0) {
 149                         serial_current = s;
 150                         return 0;
 151                 }
 152         }
 153
 154         return 1;
 155 }
 156
 157 void serial_reinit_all(void)
 158 {
 159         struct serial_device *s;
 160
 161         for (s = serial_devices; s; s = s->next)
 162                 s->start();
 163 }
 164
 165 static struct serial_device *get_current(void)
 166 {
 167         struct serial_device *dev;
 168
 169         if (!(gd->flags & GD_FLG_RELOC) || !serial_current) {
 170                 dev = default_serial_console();
 171
 172                 /* We must have a console device */
 173                 if (!dev)
 174                         panic("Cannot find console");
 175         } else
 176                 dev = serial_current;
 177         return dev;
 178 }
 179
 180 int serial_init(void)
 181 {
 182         return get_current()->start();
 183 }
 184
 185 void serial_setbrg(void)
 186 {
 187         get_current()->setbrg();
 188 }
 189
 190 int serial_getc(void)
 191 {
 192         return get_current()->getc();
 193 }
 194
 195 int serial_tstc(void)
 196 {
 197         return get_current()->tstc();
 198 }
 199
 200 void serial_putc(const char c)
 201 {
 202         get_current()->putc(c);
 203 }
 204
 205 void serial_puts(const char *s)
 206 {
 207         get_current()->puts(s);
 208 }
 209
 210 #if CONFIG_POST & CONFIG_SYS_POST_UART
 211 static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE;
 212
 213 /* Mark weak until post/cpu/.../uart.c migrate over */
 214 __weak
 215 int uart_post_test(int flags)
 216 {
 217         unsigned char c;
 218         int ret, saved_baud, b;
 219         struct serial_device *saved_dev, *s;
 220         bd_t *bd = gd->bd;
 221
 222         /* Save current serial state */
 223         ret = 0;
 224         saved_dev = serial_current;
 225         saved_baud = bd->bi_baudrate;
 226
 227         for (s = serial_devices; s; s = s->next) {
 228                 /* If this driver doesn't support loop back, skip it */
 229                 if (!s->loop)
 230                         continue;
 231
 232                 /* Test the next device */
 233                 serial_current = s;
 234
 235                 ret = serial_init();
 236                 if (ret)
 237                         goto done;
 238
 239                 /* Consume anything that happens to be queued */
 240                 while (serial_tstc())
 241                         serial_getc();
 242
 243                 /* Enable loop back */
 244                 s->loop(1);
 245
 246                 /* Test every available baud rate */
 247                 for (b = 0; b < ARRAY_SIZE(bauds); ++b) {
 248                         bd->bi_baudrate = bauds[b];
 249                         serial_setbrg();
 250
 251                         /*
 252                          * Stick to printable chars to avoid issues:
 253                          *  - terminal corruption
 254                          *  - serial program reacting to sequences and sending
 255                          *    back random extra data
 256                          *  - most serial drivers add in extra chars (like \r\n)
 257                          */
 258                         for (c = 0x20; c < 0x7f; ++c) {
 259                                 /* Send it out */
 260                                 serial_putc(c);
 261
 262                                 /* Make sure it's the same one */
 263                                 ret = (c != serial_getc());
 264                                 if (ret) {
 265                                         s->loop(0);
 266                                         goto done;
 267                                 }
 268
 269                                 /* Clean up the output in case it was sent */
 270                                 serial_putc('\b');
 271                                 ret = ('\b' != serial_getc());
 272                                 if (ret) {
 273                                         s->loop(0);
 274                                         goto done;
 275                                 }
 276                         }
 277                 }
 278
 279                 /* Disable loop back */
 280                 s->loop(0);
 281
 282                 /* XXX: There is no serial_stop() !? */
 283                 if (s->stop)
 284                         s->stop();
 285         }
 286
 287  done:
 288         /* Restore previous serial state */
 289         serial_current = saved_dev;
 290         bd->bi_baudrate = saved_baud;
 291         serial_reinit_all();
 292         serial_setbrg();
 293
 294         return ret;
 295 }
 296 #endif