arch/ia64/hp/sim/hpsim_console.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Platform dependent support for HP simulator.
   4  *
   5  * Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co
   6  *      David Mosberger-Tang <davidm@hpl.hp.com>
   7  * Copyright (C) 1999 Vijay Chander <vijay@engr.sgi.com>
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/param.h>
  13 #include <linux/string.h>
  14 #include <linux/types.h>
  15 #include <linux/tty.h>
  16 #include <linux/kdev_t.h>
  17 #include <linux/console.h>
  18
  19 #include <asm/delay.h>
  20 #include <asm/irq.h>
  21 #include <asm/pal.h>
  22 #include <asm/machvec.h>
  23 #include <asm/pgtable.h>
  24 #include <asm/sal.h>
  25 #include <asm/hpsim.h>
  26
  27 #include "hpsim_ssc.h"
  28
  29 static int simcons_init (struct console *, char *);
  30 static void simcons_write (struct console *, const char *, unsigned);
  31 static struct tty_driver *simcons_console_device (struct console *, int *);
  32
  33 static struct console hpsim_cons = {
  34         .name =         "simcons",
  35         .write =        simcons_write,
  36         .device =       simcons_console_device,
  37         .setup =        simcons_init,
  38         .flags =        CON_PRINTBUFFER,
  39         .index =        -1,
  40 };
  41
  42 static int
  43 simcons_init (struct console *cons, char *options)
  44 {
  45         return 0;
  46 }
  47
  48 static void
  49 simcons_write (struct console *cons, const char *buf, unsigned count)
  50 {
  51         unsigned long ch;
  52
  53         while (count-- > 0) {
  54                 ch = *buf++;
  55                 ia64_ssc(ch, 0, 0, 0, SSC_PUTCHAR);
  56                 if (ch == '\n')
  57                   ia64_ssc('\r', 0, 0, 0, SSC_PUTCHAR);
  58         }
  59 }
  60
  61 static struct tty_driver *simcons_console_device (struct console *c, int *index)
  62 {
  63         *index = c->index;
  64         return hp_simserial_driver;
  65 }
  66
  67 int simcons_register(void)
  68 {
  69         if (!ia64_platform_is("hpsim"))
  70                 return 1;
  71
  72         if (hpsim_cons.flags & CON_ENABLED)
  73                 return 1;
  74
  75         register_console(&hpsim_cons);
  76         return 0;
  77 }