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1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * hvc_console.h
4 * Copyright (C) 2005 IBM Corporation
5 *
6 * Author(s):
7 * Ryan S. Arnold <rsa@us.ibm.com>
8 *
9 * hvc_console header information:
10 * moved here from arch/powerpc/include/asm/hvconsole.h
11 * and drivers/char/hvc_console.c
12 */
13
14#ifndef HVC_CONSOLE_H
15#define HVC_CONSOLE_H
16#include <linux/kref.h>
17#include <linux/tty.h>
18#include <linux/spinlock.h>
19
20/*
21 * This is the max number of console adapters that can/will be found as
22 * console devices on first stage console init. Any number beyond this range
23 * can't be used as a console device but is still a valid tty device.
24 */
25#define MAX_NR_HVC_CONSOLES 16
26
27/*
28 * The Linux TTY code does not support dynamic addition of tty derived devices
29 * so we need to know how many tty devices we might need when space is allocated
30 * for the tty device. Since this driver supports hotplug of vty adapters we
31 * need to make sure we have enough allocated.
32 */
33#define HVC_ALLOC_TTY_ADAPTERS 8
34
35struct hvc_struct {
36 struct tty_port port;
37 spinlock_t lock;
38 int index;
39 int do_wakeup;
40 int outbuf_size;
41 int n_outbuf;
42 uint32_t vtermno;
43 const struct hv_ops *ops;
44 int irq_requested;
45 int data;
46 struct winsize ws;
47 struct work_struct tty_resize;
48 struct list_head next;
49 unsigned long flags;
50 u8 outbuf[] __aligned(sizeof(long));
51};
52
53/* implemented by a low level driver */
54struct hv_ops {
55 ssize_t (*get_chars)(uint32_t vtermno, u8 *buf, size_t count);
56 ssize_t (*put_chars)(uint32_t vtermno, const u8 *buf, size_t count);
57 int (*flush)(uint32_t vtermno, bool wait);
58
59 /* Callbacks for notification. Called in open, close and hangup */
60 int (*notifier_add)(struct hvc_struct *hp, int irq);
61 void (*notifier_del)(struct hvc_struct *hp, int irq);
62 void (*notifier_hangup)(struct hvc_struct *hp, int irq);
63
64 /* tiocmget/set implementation */
65 int (*tiocmget)(struct hvc_struct *hp);
66 int (*tiocmset)(struct hvc_struct *hp, unsigned int set, unsigned int clear);
67
68 /* Callbacks to handle tty ports */
69 void (*dtr_rts)(struct hvc_struct *hp, bool active);
70};
71
72/* Register a vterm and a slot index for use as a console (console_init) */
73extern int hvc_instantiate(uint32_t vtermno, int index,
74 const struct hv_ops *ops);
75
76/* register a vterm for hvc tty operation (module_init or hotplug add) */
77extern struct hvc_struct * hvc_alloc(uint32_t vtermno, int data,
78 const struct hv_ops *ops, int outbuf_size);
79/* remove a vterm from hvc tty operation (module_exit or hotplug remove) */
80extern void hvc_remove(struct hvc_struct *hp);
81
82/* data available */
83int hvc_poll(struct hvc_struct *hp);
84void hvc_kick(void);
85
86/* Resize hvc tty terminal window */
87extern void __hvc_resize(struct hvc_struct *hp, struct winsize ws);
88
89static inline void hvc_resize(struct hvc_struct *hp, struct winsize ws)
90{
91 unsigned long flags;
92
93 spin_lock_irqsave(&hp->lock, flags);
94 __hvc_resize(hp, ws);
95 spin_unlock_irqrestore(&hp->lock, flags);
96}
97
98/* default notifier for irq based notification */
99extern int notifier_add_irq(struct hvc_struct *hp, int data);
100extern void notifier_del_irq(struct hvc_struct *hp, int data);
101extern void notifier_hangup_irq(struct hvc_struct *hp, int data);
102
103
104#if defined(CONFIG_XMON) && defined(CONFIG_SMP)
105#include <asm/xmon.h>
106#else
107static inline int cpus_are_in_xmon(void)
108{
109 return 0;
110}
111#endif
112
113#endif // HVC_CONSOLE_H
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#include <linux/spinlock.h>
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
48struct hvc_struct {
49 spinlock_t lock;
50 int index;
51 struct tty_struct *tty;
52 int count;
53 int do_wakeup;
54 char *outbuf;
55 int outbuf_size;
56 int n_outbuf;
57 uint32_t vtermno;
58 const struct hv_ops *ops;
59 int irq_requested;
60 int data;
61 struct winsize ws;
62 struct work_struct tty_resize;
63 struct list_head next;
64 struct kref kref; /* ref count & hvc_struct lifetime */
65};
66
67/* implemented by a low level driver */
68struct 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);
71
72 /* Callbacks for notification. Called in open, close and hangup */
73 int (*notifier_add)(struct hvc_struct *hp, int irq);
74 void (*notifier_del)(struct hvc_struct *hp, int irq);
75 void (*notifier_hangup)(struct hvc_struct *hp, int irq);
76
77 /* tiocmget/set implementation */
78 int (*tiocmget)(struct hvc_struct *hp);
79 int (*tiocmset)(struct hvc_struct *hp, unsigned int set, unsigned int clear);
80};
81
82/* Register a vterm and a slot index for use as a console (console_init) */
83extern int hvc_instantiate(uint32_t vtermno, int index,
84 const struct hv_ops *ops);
85
86/* register a vterm for hvc tty operation (module_init or hotplug add) */
87extern struct hvc_struct * hvc_alloc(uint32_t vtermno, int data,
88 const struct hv_ops *ops, int outbuf_size);
89/* remove a vterm from hvc tty operation (module_exit or hotplug remove) */
90extern int hvc_remove(struct hvc_struct *hp);
91
92/* data available */
93int hvc_poll(struct hvc_struct *hp);
94void hvc_kick(void);
95
96/* Resize hvc tty terminal window */
97extern void __hvc_resize(struct hvc_struct *hp, struct winsize ws);
98
99static inline void hvc_resize(struct hvc_struct *hp, struct winsize ws)
100{
101 unsigned long flags;
102
103 spin_lock_irqsave(&hp->lock, flags);
104 __hvc_resize(hp, ws);
105 spin_unlock_irqrestore(&hp->lock, flags);
106}
107
108/* default notifier for irq based notification */
109extern int notifier_add_irq(struct hvc_struct *hp, int data);
110extern void notifier_del_irq(struct hvc_struct *hp, int data);
111extern void notifier_hangup_irq(struct hvc_struct *hp, int data);
112
113
114#if defined(CONFIG_XMON) && defined(CONFIG_SMP)
115#include <asm/xmon.h>
116#else
117static inline int cpus_are_in_xmon(void)
118{
119 return 0;
120}
121#endif
122
123#endif // HVC_CONSOLE_H