1/*
2 * console.c: Routines that deal with sending and receiving IO
3 *            to/from the current console device using the PROM.
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1998 Pete Zaitcev <zaitcev@yahoo.com>
7 */
8
9#include <linux/types.h>
10#include <linux/kernel.h>
11#include <linux/sched.h>
12#include <asm/openprom.h>
13#include <asm/oplib.h>
14#include <linux/string.h>
15
16extern void restore_current(void);
17
18/* Non blocking put character to console device, returns -1 if
19 * unsuccessful.
20 */
21static int prom_nbputchar(const char *buf)
22{
23	unsigned long flags;
24	int i = -1;
25
26	spin_lock_irqsave(&prom_lock, flags);
27	switch(prom_vers) {
28	case PROM_V0:
29		if ((*(romvec->pv_nbputchar))(*buf))
30			i = 1;
31		break;
32	case PROM_V2:
33	case PROM_V3:
34		if ((*(romvec->pv_v2devops).v2_dev_write)(*romvec->pv_v2bootargs.fd_stdout,
35							  buf, 0x1) == 1)
36			i = 1;
37		break;
38	default:
39		break;
40	}
41	restore_current();
42	spin_unlock_irqrestore(&prom_lock, flags);
43	return i; /* Ugh, we could spin forever on unsupported proms ;( */
44}
45
46void prom_console_write_buf(const char *buf, int len)
47{
48	while (len) {
49		int n = prom_nbputchar(buf);
50		if (n < 0)
51			continue;
52		len--;
53		buf++;
54	}
55}
56
57