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 #include <linux/tty.h>
31
32 /*
33 * This is the max number of console adapters that can/will be found as
34 * console devices on first stage console init. Any number beyond this range
35 * can't be used as a console device but is still a valid tty device.
36 */
37 #define MAX_NR_HVC_CONSOLES 16
38
39 /*
40 * The Linux TTY code does not support dynamic addition of tty derived devices
41 * so we need to know how many tty devices we might need when space is allocated
42 * for the tty device. Since this driver supports hotplug of vty adapters we
43 * need to make sure we have enough allocated.
44 */
45 #define HVC_ALLOC_TTY_ADAPTERS 8
46
47 struct hvc_struct {
48 spinlock_t lock;
49 int index;
50 struct tty_struct *tty;
51 int count;
52 int do_wakeup;
53 char *outbuf;
54 int outbuf_size;
55 int n_outbuf;
56 uint32_t vtermno;
57 struct hv_ops *ops;
58 int irq_requested;
59 int data;
60 struct winsize ws;
61 struct work_struct tty_resize;
62 struct list_head next;
63 struct kref kref; /* ref count & hvc_struct lifetime */
64 };
65
66 /* implemented by a low level driver */
67 struct hv_ops {
68 int (*get_chars)(uint32_t vtermno, char *buf, int count);
69 int (*put_chars)(uint32_t vtermno, const char *buf, int count);
70
71 /* Callbacks for notification. Called in open, close and hangup */
72 int (*notifier_add)(struct hvc_struct *hp, int irq);
73 void (*notifier_del)(struct hvc_struct *hp, int irq);
74 void (*notifier_hangup)(struct hvc_struct *hp, int irq);
75 };
76
77 /* Register a vterm and a slot index for use as a console (console_init) */
78 extern int hvc_instantiate(uint32_t vtermno, int index, struct hv_ops *ops);
79
80 /* register a vterm for hvc tty operation (module_init or hotplug add) */
81 extern struct hvc_struct * __devinit hvc_alloc(uint32_t vtermno, int data,
82 struct hv_ops *ops, int outbuf_size);
83 /* remove a vterm from hvc tty operation (module_exit or hotplug remove) */
84 extern int hvc_remove(struct hvc_struct *hp);
85
86 /* data available */
87 int hvc_poll(struct hvc_struct *hp);
88 void hvc_kick(void);
89
90 /* Resize hvc tty terminal window */
91 extern void hvc_resize(struct hvc_struct *hp, struct winsize ws);
92
93 /* default notifier for irq based notification */
94 extern int notifier_add_irq(struct hvc_struct *hp, int data);
95 extern void notifier_del_irq(struct hvc_struct *hp, int data);
96 extern void notifier_hangup_irq(struct hvc_struct *hp, int data);
97
98
99 #if defined(CONFIG_XMON) && defined(CONFIG_SMP)
100 #include <asm/xmon.h>
101 #else
102 static inline int cpus_are_in_xmon(void)
103 {
104 return 0;
105 }
106 #endif
107
108 #endif // HVC_CONSOLE_H
109
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