114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0+ */
|
||
|
|
/*
|
||
|
|
* hvc_console.h
|
||
|
|
* Copyright (C) 2005 IBM Corporation
|
||
|
|
*
|
||
|
|
* Author(s):
|
||
|
|
* Ryan S. Arnold <rsa@us.ibm.com>
|
||
|
|
*
|
||
|
|
* hvc_console header information:
|
||
|
|
* moved here from arch/powerpc/include/asm/hvconsole.h
|
||
|
|
* and drivers/char/hvc_console.c
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef HVC_CONSOLE_H
|
||
|
|
#define HVC_CONSOLE_H
|
||
|
|
#include <linux/kref.h>
|
||
|
|
#include <linux/tty.h>
|
||
|
|
#include <linux/spinlock.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This is the max number of console adapters that can/will be found as
|
||
|
|
* console devices on first stage console init. Any number beyond this range
|
||
|
|
* can't be used as a console device but is still a valid tty device.
|
||
|
|
*/
|
||
|
|
#define MAX_NR_HVC_CONSOLES 16
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The Linux TTY code does not support dynamic addition of tty derived devices
|
||
|
|
* so we need to know how many tty devices we might need when space is allocated
|
||
|
|
* for the tty device. Since this driver supports hotplug of vty adapters we
|
||
|
|
* need to make sure we have enough allocated.
|
||
|
|
*/
|
||
|
|
#define HVC_ALLOC_TTY_ADAPTERS 8
|
||
|
|
|
||
|
|
struct hvc_struct {
|
||
|
|
struct tty_port port;
|
||
|
|
spinlock_t lock;
|
||
|
|
int index;
|
||
|
|
int do_wakeup;
|
||
|
|
char *outbuf;
|
||
|
|
int outbuf_size;
|
||
|
|
int n_outbuf;
|
||
|
|
uint32_t vtermno;
|
||
|
|
const struct hv_ops *ops;
|
||
|
|
int irq_requested;
|
||
|
|
int data;
|
||
|
|
struct winsize ws;
|
||
|
|
struct work_struct tty_resize;
|
||
|
|
struct list_head next;
|
||
|
|
unsigned long flags;
|
||
|
|
};
|
||
|
|
|
||
|
|
/* implemented by a low level driver */
|
||
|
|
struct hv_ops {
|
||
|
|
int (*get_chars)(uint32_t vtermno, char *buf, int count);
|
||
|
|
int (*put_chars)(uint32_t vtermno, const char *buf, int count);
|
||
|
|
int (*flush)(uint32_t vtermno, bool wait);
|
||
|
|
|
||
|
|
/* Callbacks for notification. Called in open, close and hangup */
|
||
|
|
int (*notifier_add)(struct hvc_struct *hp, int irq);
|
||
|
|
void (*notifier_del)(struct hvc_struct *hp, int irq);
|
||
|
|
void (*notifier_hangup)(struct hvc_struct *hp, int irq);
|
||
|
|
|
||
|
|
/* tiocmget/set implementation */
|
||
|
|
int (*tiocmget)(struct hvc_struct *hp);
|
||
|
|
int (*tiocmset)(struct hvc_struct *hp, unsigned int set, unsigned int clear);
|
||
|
|
|
||
|
|
/* Callbacks to handle tty ports */
|
||
|
|
void (*dtr_rts)(struct hvc_struct *hp, int raise);
|
||
|
|
};
|
||
|
|
|
||
|
|
/* Register a vterm and a slot index for use as a console (console_init) */
|
||
|
|
extern int hvc_instantiate(uint32_t vtermno, int index,
|
||
|
|
const struct hv_ops *ops);
|
||
|
|
|
||
|
|
/* register a vterm for hvc tty operation (module_init or hotplug add) */
|
||
|
|
extern struct hvc_struct * hvc_alloc(uint32_t vtermno, int data,
|
||
|
|
const struct hv_ops *ops, int outbuf_size);
|
||
|
|
/* remove a vterm from hvc tty operation (module_exit or hotplug remove) */
|
||
|
|
extern int hvc_remove(struct hvc_struct *hp);
|
||
|
|
|
||
|
|
/* data available */
|
||
|
|
int hvc_poll(struct hvc_struct *hp);
|
||
|
|
void hvc_kick(void);
|
||
|
|
|
||
|
|
/* Resize hvc tty terminal window */
|
||
|
|
extern void __hvc_resize(struct hvc_struct *hp, struct winsize ws);
|
||
|
|
|
||
|
|
static inline void hvc_resize(struct hvc_struct *hp, struct winsize ws)
|
||
|
|
{
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&hp->lock, flags);
|
||
|
|
__hvc_resize(hp, ws);
|
||
|
|
spin_unlock_irqrestore(&hp->lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* default notifier for irq based notification */
|
||
|
|
extern int notifier_add_irq(struct hvc_struct *hp, int data);
|
||
|
|
extern void notifier_del_irq(struct hvc_struct *hp, int data);
|
||
|
|
extern void notifier_hangup_irq(struct hvc_struct *hp, int data);
|
||
|
|
|
||
|
|
|
||
|
|
#if defined(CONFIG_XMON) && defined(CONFIG_SMP)
|
||
|
|
#include <asm/xmon.h>
|
||
|
|
#else
|
||
|
|
static inline int cpus_are_in_xmon(void)
|
||
|
|
{
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif // HVC_CONSOLE_H
|