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
hvc_tile_put_chars(uint32_t vt,const char * buf,int count)28 static 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
hvc_tile_get_chars(uint32_t vt,char * buf,int count)33 static 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
47 static 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
hvc_tile_console_init(void)52 static 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 }
60 console_initcall(hvc_tile_console_init);
61
hvc_tile_init(void)62 static 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 }
68 device_initcall(hvc_tile_init);
69