/* -*- linux-c -*-
*
* drivers/char/viocons.c
*
* iSeries Virtual Terminal
*
* Authors: Dave Boutcher <boutcher@us.ibm.com>
* Ryan Arnold <ryanarn@us.ibm.com>
* Colin Devilbiss <devilbis@us.ibm.com>
* Stephen Rothwell <sfr@au1.ibm.com>
*
* (C) Copyright 2000, 2001, 2002, 2003, 2004 IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) anyu later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/errno.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/console.h>
#include <linux/module.h>
#include <asm/uaccess.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/spinlock.h>
#include <asm/ioctls.h>
#include <linux/kd.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/sysrq.h>
#include <asm/iseries/vio.h>
#include <asm/iseries/hv_lp_event.h>
#include <asm/iseries/hv_call_event.h>
#include <asm/iseries/hv_lp_config.h>
#include <asm/iseries/hv_call.h>
#ifdef CONFIG_VT
#error You must turn off CONFIG_VT to use CONFIG_VIOCONS
#endif
#define VIOTTY_MAGIC (0x0DCB)
#define VTTY_PORTS 10
#define VIOCONS_KERN_WARN KERN_WARNING "viocons: "
#define VIOCONS_KERN_INFO KERN_INFO "viocons: "
static DEFINE_SPINLOCK(consolelock);
static DEFINE_SPINLOCK(consoleloglock);
#ifdef CONFIG_MAGIC_SYSRQ
static int vio_sysrq_pressed;
extern int sysrq_enabled;
#endif
/*
* The structure of the events that flow between us and OS/400. You can't
* mess with this unless the OS/400 side changes too
*/
struct viocharlpevent {
struct HvLpEvent event;
u32 reserved;
u16 version;
u16 subtype_result_code;
u8 virtual_device;
u8 len;
u8 data[VIOCHAR_MAX_DATA];
};
#define VIOCHAR_WINDOW 10
#define VIOCHAR_HIGHWATERMARK 3
enum viocharsubtype {
viocharopen = 0x0001,
viocharclose = 0x0002,
viochardata = 0x0003,
viocharack = 0x0004,
viocharconfig = 0x0005
};
enum viochar_rc {
viochar_rc_ebusy = 1
};
#define VIOCHAR_NUM_BUF 16
/*
* Our port information. We store a pointer to one entry in the
* tty_driver_data
*/
static struct port_info {
int magic;
struct tty_struct *tty;
HvLpIndex lp;
u8 vcons;
u64 seq; /* sequence number of last HV send */
u64 ack; /* last ack from HV */
/*
* When we get writes faster than we can send it to the partition,
* buffer the data here. Note that used is a bit map of used buffers.
* It had better have enough bits to hold VIOCHAR_NUM_BUF the bitops assume
* it is a multiple of unsigned long
*/
unsigned long used;
u8 *buffer[VIOCHAR_NUM_BUF];
int bufferBytes[VIOCHAR_NUM_BUF];
int curbuf;
int bufferOverflow;
int overflowMessage;
} port_info[VTTY_PORTS];
#define viochar_is_console(pi) ((pi) == &port_info[0])
#define viochar_port(pi) ((pi) - &port_info[0])
static void initDataEvent(struct viocharlpevent *viochar, HvLpIndex lp);
static struct tty_driver *viotty_driver;
static void hvlog(char *fmt, ...)
{
int i;
unsigned long flags;
va_list args;
static char buf[256];
spin_lock_irqsave(&consoleloglock, flags);
va_start(args, fmt);
i = vscnprintf(buf, sizeof(buf) - 1, fmt, args);
va_end(args);
buf[i++] = '\r';
HvCall_writeLogBuffer(buf, i);
spin_unlock_irqrestore(&consoleloglock, flags);
}
static void hvlogOutput(const char *buf, int count)
{
unsigned long flags;
int begin;