1// SPDX-License-Identifier: GPL-2.0+
 2/*
 3 * udbg interface to hvc_console.c
 4 *
 5 * (C) Copyright David Gibson, IBM Corporation 2008.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 6 */
 7
 8#include <linux/console.h>
 9#include <linux/delay.h>
10#include <linux/err.h>
11#include <linux/init.h>
12#include <linux/moduleparam.h>
13#include <linux/types.h>
14#include <linux/irq.h>
15
16#include <asm/udbg.h>
17
18#include "hvc_console.h"
19
20static struct hvc_struct *hvc_udbg_dev;
21
22static ssize_t hvc_udbg_put(uint32_t vtermno, const u8 *buf, size_t count)
23{
24	size_t i;
25
26	for (i = 0; i < count && udbg_putc; i++)
27		udbg_putc(buf[i]);
28
29	return i;
30}
31
32static ssize_t hvc_udbg_get(uint32_t vtermno, u8 *buf, size_t count)
33{
34	size_t i;
35	int c;
36
37	if (!udbg_getc_poll)
38		return 0;
39
40	for (i = 0; i < count; i++) {
41		if ((c = udbg_getc_poll()) == -1)
42			break;
43		buf[i] = c;
44	}
45
46	return i;
47}
48
49static const struct hv_ops hvc_udbg_ops = {
50	.get_chars = hvc_udbg_get,
51	.put_chars = hvc_udbg_put,
52};
53
54static int __init hvc_udbg_init(void)
55{
56	struct hvc_struct *hp;
57
58	if (!udbg_putc)
59		return -ENODEV;
60
61	BUG_ON(hvc_udbg_dev);
62
63	hp = hvc_alloc(0, 0, &hvc_udbg_ops, 16);
64	if (IS_ERR(hp))
65		return PTR_ERR(hp);
66
67	hvc_udbg_dev = hp;
68
69	return 0;
70}
71device_initcall(hvc_udbg_init);
72
73static int __init hvc_udbg_console_init(void)
74{
75	if (!udbg_putc)
76		return -ENODEV;
77
78	hvc_instantiate(0, 0, &hvc_udbg_ops);
79	add_preferred_console("hvc", 0, NULL);
80
81	return 0;
82}
83console_initcall(hvc_udbg_console_init);

 
 1/*
 2 * udbg interface to hvc_console.c
 3 *
 4 * (C) Copyright David Gibson, IBM Corporation 2008.
 5 *
 6 * This program is free software; you can redistribute it and/or modify
 7 * it under the terms of the GNU General Public License as published by
 8 * the Free Software Foundation; either version 2 of the License, or
 9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19 */
20
21#include <linux/console.h>
22#include <linux/delay.h>
23#include <linux/err.h>
24#include <linux/init.h>
25#include <linux/moduleparam.h>
26#include <linux/types.h>
27#include <linux/irq.h>
28
29#include <asm/udbg.h>
30
31#include "hvc_console.h"
32
33struct hvc_struct *hvc_udbg_dev;
34
35static int hvc_udbg_put(uint32_t vtermno, const char *buf, int count)
36{
37	int i;
38
39	for (i = 0; i < count && udbg_putc; i++)
40		udbg_putc(buf[i]);
41
42	return i;
43}
44
45static int hvc_udbg_get(uint32_t vtermno, char *buf, int count)
46{
47	int i, c;
 
48
49	if (!udbg_getc_poll)
50		return 0;
51
52	for (i = 0; i < count; i++) {
53		if ((c = udbg_getc_poll()) == -1)
54			break;
55		buf[i] = c;
56	}
57
58	return i;
59}
60
61static const struct hv_ops hvc_udbg_ops = {
62	.get_chars = hvc_udbg_get,
63	.put_chars = hvc_udbg_put,
64};
65
66static int __init hvc_udbg_init(void)
67{
68	struct hvc_struct *hp;
69
70	if (!udbg_putc)
71		return -ENODEV;
72
73	BUG_ON(hvc_udbg_dev);
74
75	hp = hvc_alloc(0, 0, &hvc_udbg_ops, 16);
76	if (IS_ERR(hp))
77		return PTR_ERR(hp);
78
79	hvc_udbg_dev = hp;
80
81	return 0;
82}
83device_initcall(hvc_udbg_init);
84
85static int __init hvc_udbg_console_init(void)
86{
87	if (!udbg_putc)
88		return -ENODEV;
89
90	hvc_instantiate(0, 0, &hvc_udbg_ops);
91	add_preferred_console("hvc", 0, NULL);
92
93	return 0;
94}
95console_initcall(hvc_udbg_console_init);