tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/*
2 * hvc_console.h
3 * Copyright (C) 2005 IBM Corporation
4 *
5 * Author(s):
6 * Ryan S. Arnold <rsa@us.ibm.com>
7 *
8 * hvc_console header information:
9 * moved here from arch/powerpc/include/asm/hvconsole.h
10 * and drivers/char/hvc_console.c
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 */
26
27#ifndef HVC_CONSOLE_H
28#define HVC_CONSOLE_H
29#include <linux/kref.h>
30
31/*
32 * This is the max number of console adapters that can/will be found as
33 * console devices on first stage console init. Any number beyond this range
34 * can't be used as a console device but is still a valid tty device.
35 */
36#define MAX_NR_HVC_CONSOLES 16
37
38/*
39 * The Linux TTY code does not support dynamic addition of tty derived devices
40 * so we need to know how many tty devices we might need when space is allocated
41 * for the tty device. Since this driver supports hotplug of vty adapters we
42 * need to make sure we have enough allocated.
43 */
44#define HVC_ALLOC_TTY_ADAPTERS 8
45
46struct hvc_struct {
47 spinlock_t lock;
48 int index;
49 struct tty_struct *tty;
50 unsigned int count;
51 int do_wakeup;
52 char *outbuf;
53 int outbuf_size;
54 int n_outbuf;
55 uint32_t vtermno;
56 struct hv_ops *ops;
57 int irq_requested;
58 int data;
59 struct list_head next;
60 struct kref kref; /* ref count & hvc_struct lifetime */
61};
62
63/* implemented by a low level driver */
64struct hv_ops {
65 int (*get_chars)(uint32_t vtermno, char *buf, int count);
66 int (*put_chars)(uint32_t vtermno, const char *buf, int count);
67
68 /* Callbacks for notification. Called in open and close */
69 int (*notifier_add)(struct hvc_struct *hp, int irq);
70 void (*notifier_del)(struct hvc_struct *hp, int irq);
71};
72
73/* Register a vterm and a slot index for use as a console (console_init) */
74extern int hvc_instantiate(uint32_t vtermno, int index, struct hv_ops *ops);
75
76/* register a vterm for hvc tty operation (module_init or hotplug add) */
77extern struct hvc_struct * __devinit hvc_alloc(uint32_t vtermno, int data,
78 struct hv_ops *ops, int outbuf_size);
79/* remove a vterm from hvc tty operation (module_exit or hotplug remove) */
80extern int __devexit hvc_remove(struct hvc_struct *hp);
81
82/* data available */
83int hvc_poll(struct hvc_struct *hp);
84void hvc_kick(void);
85
86/* default notifier for irq based notification */
87extern int notifier_add_irq(struct hvc_struct *hp, int data);
88extern void notifier_del_irq(struct hvc_struct *hp, int data);
89
90
91#if defined(CONFIG_XMON) && defined(CONFIG_SMP)
92#include <asm/xmon.h>
93#else
94static inline int cpus_are_in_xmon(void)
95{
96 return 0;
97}
98#endif
99
100#endif // HVC_CONSOLE_H