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45d607ed RA |
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: | |
b8b572e1 | 9 | * moved here from arch/powerpc/include/asm/hvconsole.h |
45d607ed RA |
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 | |
611e097d | 29 | #include <linux/kref.h> |
febde371 | 30 | #include <linux/tty.h> |
254be490 | 31 | #include <linux/spinlock.h> |
45d607ed RA |
32 | |
33 | /* | |
34 | * This is the max number of console adapters that can/will be found as | |
35 | * console devices on first stage console init. Any number beyond this range | |
36 | * can't be used as a console device but is still a valid tty device. | |
37 | */ | |
38 | #define MAX_NR_HVC_CONSOLES 16 | |
39 | ||
40 | /* | |
41 | * The Linux TTY code does not support dynamic addition of tty derived devices | |
42 | * so we need to know how many tty devices we might need when space is allocated | |
43 | * for the tty device. Since this driver supports hotplug of vty adapters we | |
44 | * need to make sure we have enough allocated. | |
45 | */ | |
46 | #define HVC_ALLOC_TTY_ADAPTERS 8 | |
47 | ||
611e097d CB |
48 | struct hvc_struct { |
49 | spinlock_t lock; | |
50 | int index; | |
51 | struct tty_struct *tty; | |
3d26825e | 52 | int count; |
611e097d CB |
53 | int do_wakeup; |
54 | char *outbuf; | |
55 | int outbuf_size; | |
56 | int n_outbuf; | |
57 | uint32_t vtermno; | |
b5113068 | 58 | const struct hv_ops *ops; |
611e097d CB |
59 | int irq_requested; |
60 | int data; | |
febde371 HB |
61 | struct winsize ws; |
62 | struct work_struct tty_resize; | |
611e097d CB |
63 | struct list_head next; |
64 | struct kref kref; /* ref count & hvc_struct lifetime */ | |
65 | }; | |
45d607ed RA |
66 | |
67 | /* implemented by a low level driver */ | |
68 | struct hv_ops { | |
69 | int (*get_chars)(uint32_t vtermno, char *buf, int count); | |
70 | int (*put_chars)(uint32_t vtermno, const char *buf, int count); | |
45d607ed | 71 | |
fc362e2e | 72 | /* Callbacks for notification. Called in open, close and hangup */ |
611e097d CB |
73 | int (*notifier_add)(struct hvc_struct *hp, int irq); |
74 | void (*notifier_del)(struct hvc_struct *hp, int irq); | |
fc362e2e | 75 | void (*notifier_hangup)(struct hvc_struct *hp, int irq); |
611e097d | 76 | }; |
45d607ed RA |
77 | |
78 | /* Register a vterm and a slot index for use as a console (console_init) */ | |
b5113068 RR |
79 | extern int hvc_instantiate(uint32_t vtermno, int index, |
80 | const struct hv_ops *ops); | |
45d607ed RA |
81 | |
82 | /* register a vterm for hvc tty operation (module_init or hotplug add) */ | |
119ea109 AS |
83 | extern struct hvc_struct * hvc_alloc(uint32_t vtermno, int data, |
84 | const struct hv_ops *ops, int outbuf_size); | |
611e097d | 85 | /* remove a vterm from hvc tty operation (module_exit or hotplug remove) */ |
934752d8 | 86 | extern int hvc_remove(struct hvc_struct *hp); |
45d607ed | 87 | |
611e097d CB |
88 | /* data available */ |
89 | int hvc_poll(struct hvc_struct *hp); | |
90 | void hvc_kick(void); | |
91 | ||
febde371 | 92 | /* Resize hvc tty terminal window */ |
254be490 HB |
93 | extern void __hvc_resize(struct hvc_struct *hp, struct winsize ws); |
94 | ||
95 | static inline void hvc_resize(struct hvc_struct *hp, struct winsize ws) | |
96 | { | |
97 | unsigned long flags; | |
98 | ||
99 | spin_lock_irqsave(&hp->lock, flags); | |
100 | __hvc_resize(hp, ws); | |
101 | spin_unlock_irqrestore(&hp->lock, flags); | |
102 | } | |
febde371 | 103 | |
611e097d CB |
104 | /* default notifier for irq based notification */ |
105 | extern int notifier_add_irq(struct hvc_struct *hp, int data); | |
106 | extern void notifier_del_irq(struct hvc_struct *hp, int data); | |
fc362e2e | 107 | extern void notifier_hangup_irq(struct hvc_struct *hp, int data); |
611e097d | 108 | |
1c8950ff ME |
109 | |
110 | #if defined(CONFIG_XMON) && defined(CONFIG_SMP) | |
111 | #include <asm/xmon.h> | |
112 | #else | |
113 | static inline int cpus_are_in_xmon(void) | |
114 | { | |
115 | return 0; | |
116 | } | |
117 | #endif | |
118 | ||
45d607ed | 119 | #endif // HVC_CONSOLE_H |