forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
82 lines
1.3 KiB
82 lines
1.3 KiB
// SPDX-License-Identifier: GPL-2.0+ |
|
/* |
|
* udbg interface to hvc_console.c |
|
* |
|
* (C) Copyright David Gibson, IBM Corporation 2008. |
|
*/ |
|
|
|
#include <linux/console.h> |
|
#include <linux/delay.h> |
|
#include <linux/err.h> |
|
#include <linux/init.h> |
|
#include <linux/moduleparam.h> |
|
#include <linux/types.h> |
|
#include <linux/irq.h> |
|
|
|
#include <asm/udbg.h> |
|
|
|
#include "hvc_console.h" |
|
|
|
static struct hvc_struct *hvc_udbg_dev; |
|
|
|
static int hvc_udbg_put(uint32_t vtermno, const char *buf, int count) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < count && udbg_putc; i++) |
|
udbg_putc(buf[i]); |
|
|
|
return i; |
|
} |
|
|
|
static int hvc_udbg_get(uint32_t vtermno, char *buf, int count) |
|
{ |
|
int i, c; |
|
|
|
if (!udbg_getc_poll) |
|
return 0; |
|
|
|
for (i = 0; i < count; i++) { |
|
if ((c = udbg_getc_poll()) == -1) |
|
break; |
|
buf[i] = c; |
|
} |
|
|
|
return i; |
|
} |
|
|
|
static const struct hv_ops hvc_udbg_ops = { |
|
.get_chars = hvc_udbg_get, |
|
.put_chars = hvc_udbg_put, |
|
}; |
|
|
|
static int __init hvc_udbg_init(void) |
|
{ |
|
struct hvc_struct *hp; |
|
|
|
if (!udbg_putc) |
|
return -ENODEV; |
|
|
|
BUG_ON(hvc_udbg_dev); |
|
|
|
hp = hvc_alloc(0, 0, &hvc_udbg_ops, 16); |
|
if (IS_ERR(hp)) |
|
return PTR_ERR(hp); |
|
|
|
hvc_udbg_dev = hp; |
|
|
|
return 0; |
|
} |
|
device_initcall(hvc_udbg_init); |
|
|
|
static int __init hvc_udbg_console_init(void) |
|
{ |
|
if (!udbg_putc) |
|
return -ENODEV; |
|
|
|
hvc_instantiate(0, 0, &hvc_udbg_ops); |
|
add_preferred_console("hvc", 0, NULL); |
|
|
|
return 0; |
|
} |
|
console_initcall(hvc_udbg_console_init);
|
|
|