Root/drivers/tty/hvc/hvc_tile.c

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

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