LXR linux/drivers/tty/hvc/hvc

   1/*
   2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3 *
   4 *   This program is free software; you can redistribute it and/or
   5 *   modify it under the terms of the GNU General Public License
   6 *   as published by the Free Software Foundation, version 2.
   7 *
   8 *   This program is distributed in the hope that it will be useful, but
   9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11 *   NON INFRINGEMENT.  See the GNU General Public License for
  12 *   more details.
  13 *
  14 * Tilera TILE Processor hypervisor console
  15 */
  16
  17#include <linux/console.h>
  18#include <linux/delay.h>
  19#include <linux/err.h>
  20#include <linux/init.h>
  21#include <linux/moduleparam.h>
  22#include <linux/types.h>
  23
  24#include <hv/hypervisor.h>
  25
  26#include "hvc_console.h"
  27
  28static int hvc_tile_put_chars(uint32_t vt, const char *buf, int count)
  29{
  30        return hv_console_write((HV_VirtAddr)buf, count);
  31}
  32
  33static int hvc_tile_get_chars(uint32_t vt, char *buf, int count)
  34{
  35        int i, c;
  36
  37        for (i = 0; i < count; ++i) {
  38                c = hv_console_read_if_ready();
  39                if (c < 0)
  40                        break;
  41                buf[i] = c;
  42        }
  43
  44        return i;
  45}
  46
  47static const struct hv_ops hvc_tile_get_put_ops = {
  48        .get_chars = hvc_tile_get_chars,
  49        .put_chars = hvc_tile_put_chars,
  50};
  51
  52static int __init hvc_tile_console_init(void)
  53{
  54        extern void disable_early_printk(void);
  55        hvc_instantiate(0, 0, &hvc_tile_get_put_ops);
  56        add_preferred_console("hvc", 0, NULL);
  57        disable_early_printk();
  58        return 0;
  59}
  60console_initcall(hvc_tile_console_init);
  61
  62static int __init hvc_tile_init(void)
  63{
  64        struct hvc_struct *s;
  65        s = hvc_alloc(0, 0, &hvc_tile_get_put_ops, 128);
  66        return IS_ERR(s) ? PTR_ERR(s) : 0;
  67}
  68device_initcall(hvc_tile_init);
  69