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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> |
45d607ed RA |
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 | ||
611e097d CB |
47 | struct hvc_struct { |
48 | spinlock_t lock; | |
49 | int index; | |
50 | struct tty_struct *tty; | |
51 | unsigned 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; | |
febde371 HB |
60 | struct winsize ws; |
61 | struct work_struct tty_resize; | |
611e097d CB |
62 | struct list_head next; |
63 | struct kref kref; /* ref count & hvc_struct lifetime */ | |
64 | }; | |
45d607ed RA |
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); | |
45d607ed | 70 | |
fc362e2e | 71 | /* Callbacks for notification. Called in open, close and hangup */ |
611e097d CB |
72 | int (*notifier_add)(struct hvc_struct *hp, int irq); |
73 | void (*notifier_del)(struct hvc_struct *hp, int irq); | |
fc362e2e | 74 | void (*notifier_hangup)(struct hvc_struct *hp, int irq); |
611e097d | 75 | }; |
45d607ed RA |
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) */ | |
611e097d | 81 | extern struct hvc_struct * __devinit hvc_alloc(uint32_t vtermno, int data, |
4e9e95a3 | 82 | struct hv_ops *ops, int outbuf_size); |
611e097d | 83 | /* remove a vterm from hvc tty operation (module_exit or hotplug remove) */ |
934752d8 | 84 | extern int hvc_remove(struct hvc_struct *hp); |
45d607ed | 85 | |
611e097d CB |
86 | /* data available */ |
87 | int hvc_poll(struct hvc_struct *hp); | |
88 | void hvc_kick(void); | |
89 | ||
febde371 HB |
90 | /* Resize hvc tty terminal window */ |
91 | extern void hvc_resize(struct hvc_struct *hp, struct winsize ws); | |
92 | ||
611e097d CB |
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); | |
fc362e2e | 96 | extern void notifier_hangup_irq(struct hvc_struct *hp, int data); |
611e097d | 97 | |
1c8950ff ME |
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 | ||
45d607ed | 108 | #endif // HVC_CONSOLE_H |