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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: | |
9 | * moved here from include/asm-powerpc/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 | |
611e097d | 29 | #include <linux/kref.h> |
45d607ed RA |
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 | ||
611e097d CB |
46 | struct 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 | }; | |
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62 | |
63 | /* implemented by a low level driver */ | |
64 | struct 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); | |
45d607ed | 67 | |
611e097d CB |
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 | }; | |
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72 | |
73 | /* Register a vterm and a slot index for use as a console (console_init) */ | |
74 | extern 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) */ | |
611e097d | 77 | extern struct hvc_struct * __devinit hvc_alloc(uint32_t vtermno, int data, |
4e9e95a3 | 78 | struct hv_ops *ops, int outbuf_size); |
611e097d | 79 | /* remove a vterm from hvc tty operation (module_exit or hotplug remove) */ |
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80 | extern int __devexit hvc_remove(struct hvc_struct *hp); |
81 | ||
611e097d CB |
82 | /* data available */ |
83 | int hvc_poll(struct hvc_struct *hp); | |
84 | void hvc_kick(void); | |
85 | ||
86 | /* default notifier for irq based notification */ | |
87 | extern int notifier_add_irq(struct hvc_struct *hp, int data); | |
88 | extern void notifier_del_irq(struct hvc_struct *hp, int data); | |
89 | ||
1c8950ff ME |
90 | |
91 | #if defined(CONFIG_XMON) && defined(CONFIG_SMP) | |
92 | #include <asm/xmon.h> | |
93 | #else | |
94 | static inline int cpus_are_in_xmon(void) | |
95 | { | |
96 | return 0; | |
97 | } | |
98 | #endif | |
99 | ||
45d607ed | 100 | #endif // HVC_CONSOLE_H |