File: [Development] / linux-2.4-xfs / drivers / s390 / char / con3215.c (download)
Revision 1.2, Thu Jan 20 13:59:19 2005 UTC (12 years, 8 months ago) by nathans.longdrop.melbourne.sgi.com
Branch: MAIN
CVS Tags: HEAD
Changes since 1.1: +2 -8
lines
Merge up to 2.4.29.
Merge of 2.4.x-xfs-melb:linux:21231a by kenmcd.
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/*
* drivers/s390/char/con3215.c
* 3215 line mode terminal driver.
*
* S390 version
* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
*
* Updated:
* Aug-2000: Added tab support
* Dan Morrison, IBM Corporation (dmorriso@cse.buffalo.edu)
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kdev_t.h>
#include <linux/tty.h>
#include <linux/vt_kern.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/bootmem.h>
#include <linux/devfs_fs_kernel.h>
#include <asm/io.h>
#include <asm/ebcdic.h>
#include <asm/uaccess.h>
#include <asm/delay.h>
#include <asm/cpcmd.h>
#include <asm/irq.h>
#include <asm/setup.h>
#include "ctrlchar.h"
#define NR_3215 1
#define NR_3215_REQ (4*NR_3215)
#define RAW3215_BUFFER_SIZE 65536 /* output buffer size */
#define RAW3215_INBUF_SIZE 256 /* input buffer size */
#define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */
#define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */
#define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */
#define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */
#define RAW3215_NR_CCWS 3
#define RAW3215_TIMEOUT HZ/10 /* time for delayed output */
#define RAW3215_FIXED 1 /* 3215 console device is not be freed */
#define RAW3215_ACTIVE 2 /* set if the device is in use */
#define RAW3215_WORKING 4 /* set if a request is being worked on */
#define RAW3215_THROTTLED 8 /* set if reading is disabled */
#define RAW3215_STOPPED 16 /* set if writing is disabled */
#define RAW3215_CLOSING 32 /* set while in close process */
#define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */
#define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */
#define RAW3215_BH_PENDING 256 /* indication for bh scheduling */
#define TAB_STOP_SIZE 8 /* tab stop size */
struct _raw3215_info; /* forward declaration ... */
int raw3215_condevice = -1; /* preset console device */
/*
* Request types for a 3215 device
*/
typedef enum {
RAW3215_FREE, RAW3215_READ, RAW3215_WRITE
} raw3215_type;
/*
* Request structure for a 3215 device
*/
typedef struct _raw3215_req {
raw3215_type type; /* type of the request */
int start, len; /* start index & len in output buffer */
int delayable; /* indication to wait for more data */
int residual; /* residual count for read request */
ccw1_t ccws[RAW3215_NR_CCWS]; /* space for the channel program */
struct _raw3215_info *info; /* pointer to main structure */
struct _raw3215_req *next; /* pointer to next request */
} raw3215_req __attribute__ ((aligned(8)));
typedef struct _raw3215_info {
int flags; /* state flags */
int irq; /* interrupt number to do_IO */
char *buffer; /* pointer to output buffer */
char *inbuf; /* pointer to input buffer */
int head; /* first free byte in output buffer */
int count; /* number of bytes in output buffer */
int written; /* number of bytes in write requests */
devstat_t devstat; /* device status structure for do_IO */
struct tty_struct *tty; /* pointer to tty structure if present */
struct tq_struct tqueue; /* task queue to bottom half */
raw3215_req *queued_read; /* pointer to queued read requests */
raw3215_req *queued_write; /* pointer to queued write requests */
wait_queue_head_t empty_wait; /* wait queue for flushing */
struct timer_list timer; /* timer for delayed output */
char *message; /* pending message from raw3215_irq */
int msg_dstat; /* dstat for pending message */
int msg_cstat; /* cstat for pending message */
int line_pos; /* position on the line (for tabs) */
} raw3215_info;
static raw3215_info *raw3215[NR_3215]; /* array of 3215 devices structures */
static raw3215_req *raw3215_freelist; /* list of free request structures */
static spinlock_t raw3215_freelist_lock;/* spinlock to protect free list */
static struct tty_driver tty3215_driver;
static struct tty_struct *tty3215_table[NR_3215];
static struct termios *tty3215_termios[NR_3215];
static struct termios *tty3215_termios_locked[NR_3215];
static int tty3215_refcount;
#ifndef MIN
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
/*
* Get a request structure from the free list
*/
static inline raw3215_req *raw3215_alloc_req(void) {
raw3215_req *req;
unsigned long flags;
spin_lock_irqsave(&raw3215_freelist_lock, flags);
req = raw3215_freelist;
raw3215_freelist = req->next;
spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
return req;
}
/*
* Put a request structure back to the free list
*/
static inline void raw3215_free_req(raw3215_req *req) {
unsigned long flags;
if (req->type == RAW3215_FREE)
return; /* don't free a free request */
req->type = RAW3215_FREE;
spin_lock_irqsave(&raw3215_freelist_lock, flags);
req->next = raw3215_freelist;
raw3215_freelist = req;
spin_unlock_irqrestore(&raw3215_freelist_lock, flags);
}
/*
* Set up a read request that reads up to 160 byte from the 3215 device.
* If there is a queued read request it is used, but that shouldn't happen
* because a 3215 terminal won't accept a new read before the old one is
* completed.
*/
static void raw3215_mk_read_req(raw3215_info *raw)
{
raw3215_req *req;
ccw1_t *ccw;
/* there can only be ONE read request at a time */
req = raw->queued_read;
if (req == NULL) {
/* no queued read request, use new req structure */
req = raw3215_alloc_req();
req->type = RAW3215_READ;
req->info = raw;
raw->queued_read = req;
}
ccw = req->ccws;
ccw->cmd_code = 0x0A; /* read inquiry */
ccw->flags = 0x20; /* ignore incorrect length */
ccw->count = 160;
ccw->cda = (__u32) __pa(raw->inbuf);
}
/*
* Set up a write request with the information from the main structure.
* A ccw chain is created that writes as much as possible from the output
* buffer to the 3215 device. If a queued write exists it is replaced by
* the new, probably lengthened request.
*/
static void raw3215_mk_write_req(raw3215_info *raw)
{
raw3215_req *req;
ccw1_t *ccw;
int len, count, ix, lines;
if (raw->count <= raw->written)
return;
/* check if there is a queued write request */
req = raw->queued_write;
if (req == NULL) {
/* no queued write request, use new req structure */
req = raw3215_alloc_req();
req->type = RAW3215_WRITE;
req->info = raw;
raw->queued_write = req;
} else {
raw->written -= req->len;
}
ccw = req->ccws;
req->start = (raw->head - raw->count + raw->written) &
(RAW3215_BUFFER_SIZE - 1);
/*
* now we have to count newlines. We can at max accept
* RAW3215_MAX_NEWLINE newlines in a single ssch due to
* a restriction in VM
*/
lines = 0;
ix = req->start;
while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) {
if (raw->buffer[ix] == 0x15)
lines++;
ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
}
len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1;
if (len > RAW3215_MAX_BYTES)
len = RAW3215_MAX_BYTES;
req->len = len;
raw->written += len;
/* set the indication if we should try to enlarge this request */
req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE);
ix = req->start;
while (len > 0) {
if (ccw > req->ccws)
ccw[-1].flags |= 0x40; /* use command chaining */
ccw->cmd_code = 0x01; /* write, auto carrier return */
ccw->flags = 0x20; /* ignore incorrect length ind. */
ccw->cda =
(__u32) __pa(raw->buffer + ix);
count = len;
if (ix + count > RAW3215_BUFFER_SIZE)
count = RAW3215_BUFFER_SIZE - ix;
ccw->count = count;
len -= count;
ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1);
ccw++;
}
/*
* Add a NOP to the channel program. 3215 devices are purely
* emulated and its much better to avoid the channel end
* interrupt in this case.
*/
if (ccw > req->ccws)
ccw[-1].flags |= 0x40; /* use command chaining */
ccw->cmd_code = 0x03; /* NOP */
ccw->flags = 0;
ccw->cda = 0;
ccw->count = 1;
}
/*
* Start a read or a write request
*/
static void raw3215_start_io(raw3215_info *raw)
{
raw3215_req *req;
int res;
req = raw->queued_read;
if (req != NULL &&
!(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) {
/* dequeue request */
raw->queued_read = NULL;
res = do_IO(raw->irq, req->ccws, (unsigned long) req, 0, 0);
if (res != 0) {
/* do_IO failed, put request back to queue */
raw->queued_read = req;
} else {
raw->flags |= RAW3215_WORKING;
}
}
req = raw->queued_write;
if (req != NULL &&
!(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) {
/* dequeue request */
raw->queued_write = NULL;
res = do_IO(raw->irq, req->ccws, (unsigned long) req, 0, 0);
if (res != 0) {
/* do_IO failed, put request back to queue */
raw->queued_write = req;
} else {
raw->flags |= RAW3215_WORKING;
}
}
}
/*
* Function to start a delayed output after RAW3215_TIMEOUT seconds
*/
static void raw3215_timeout(unsigned long __data)
{
raw3215_info *raw = (raw3215_info *) __data;
unsigned long flags;
s390irq_spin_lock_irqsave(raw->irq, flags);
if (raw->flags & RAW3215_TIMER_RUNS) {
del_timer(&raw->timer);
raw->flags &= ~RAW3215_TIMER_RUNS;
raw3215_mk_write_req(raw);
raw3215_start_io(raw);
}
s390irq_spin_unlock_irqrestore(raw->irq, flags);
}
/*
* Function to conditionally start an IO. A read is started immediatly,
* a write is only started immediatly if the flush flag is on or the
* amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
* done immediatly a timer is started with a delay of RAW3215_TIMEOUT.
*/
static inline void raw3215_try_io(raw3215_info *raw)
{
if (!(raw->flags & RAW3215_ACTIVE))
return;
if (raw->queued_read != NULL)
raw3215_start_io(raw);
else if (raw->queued_write != NULL) {
if ((raw->queued_write->delayable == 0) ||
(raw->flags & RAW3215_FLUSHING)) {
/* execute write requests bigger than minimum size */
raw3215_start_io(raw);
if (raw->flags & RAW3215_TIMER_RUNS) {
del_timer(&raw->timer);
raw->flags &= ~RAW3215_TIMER_RUNS;
}
} else if (!(raw->flags & RAW3215_TIMER_RUNS)) {
/* delay small writes */
init_timer(&raw->timer);
raw->timer.expires = RAW3215_TIMEOUT + jiffies;
raw->timer.data = (unsigned long) raw;
raw->timer.function = raw3215_timeout;
add_timer(&raw->timer);
raw->flags |= RAW3215_TIMER_RUNS;
}
}
}
/*
* The bottom half handler routine for 3215 devices. It tries to start
* the next IO and wakes up processes waiting on the tty.
*/
static void raw3215_softint(void *data)
{
raw3215_info *raw;
struct tty_struct *tty;
unsigned long flags;
raw = (raw3215_info *) data;
s390irq_spin_lock_irqsave(raw->irq, flags);
raw3215_mk_write_req(raw);
raw3215_try_io(raw);
raw->flags &= ~RAW3215_BH_PENDING;
s390irq_spin_unlock_irqrestore(raw->irq, flags);
/* Check for pending message from raw3215_irq */
if (raw->message != NULL) {
printk(raw->message, raw->irq, raw->msg_dstat, raw->msg_cstat);
raw->message = NULL;
}
tty = raw->tty;
if (tty != NULL &&
RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) {
tty_wakeup(tty);
}
}
/*
* Function to safely add raw3215_softint to tq_immediate.
* The s390irq spinlock must be held.
*/
static inline void raw3215_sched_bh(raw3215_info *raw)
{
if (raw->flags & RAW3215_BH_PENDING)
return; /* already pending */
raw->flags |= RAW3215_BH_PENDING;
INIT_LIST_HEAD(&raw->tqueue.list);
raw->tqueue.sync = 0;
raw->tqueue.routine = raw3215_softint;
raw->tqueue.data = raw;
queue_task(&raw->tqueue, &tq_immediate);
mark_bh(IMMEDIATE_BH);
}
/*
* Find the raw3215_info structure associated with irq
*/
static inline raw3215_info *raw3215_find_info(int irq) {
raw3215_info *raw;
int i;
for (i = 0; i < NR_3215; i++) {
raw = raw3215[i];
if (raw != NULL && raw->irq == irq &&
(raw->flags & RAW3215_ACTIVE))
break;
}
return (i >= NR_3215) ? NULL : raw;
}
/*
* Interrupt routine, called from Ingo's I/O layer
*/
static void raw3215_irq(int irq, void *int_parm, struct pt_regs *regs)
{
raw3215_info *raw;
raw3215_req *req;
struct tty_struct *tty;
devstat_t *stat;
int cstat, dstat;
int count, slen;
stat = (devstat_t *) int_parm;
req = (raw3215_req *) stat->intparm;
cstat = stat->cstat;
dstat = stat->dstat;
if (cstat != 0) {
raw = raw3215_find_info(irq);
if (raw != NULL) {
raw->message = KERN_WARNING
"Got nonzero channel status in raw3215_irq "
"(dev %i, dev sts 0x%2x, sch sts 0x%2x)";
raw->msg_dstat = dstat;
raw->msg_cstat = cstat;
raw3215_sched_bh(raw);
}
}
if (dstat & 0x01) { /* we got a unit exception */
dstat &= ~0x01; /* we can ignore it */
}
switch (dstat) {
case 0x80:
if (cstat != 0)
break;
/* Attention interrupt, someone hit the enter key */
if ((raw = raw3215_find_info(irq)) == NULL)
return; /* That shouldn't happen ... */
/* Setup a read request */
raw3215_mk_read_req(raw);
if (MACHINE_IS_P390)
memset(raw->inbuf, 0, RAW3215_INBUF_SIZE);
raw3215_sched_bh(raw);
break;
case 0x08:
case 0x0C:
/* Channel end interrupt. */
if ((raw = req->info) == NULL)
return; /* That shouldn't happen ... */
if (req->type == RAW3215_READ) {
/* store residual count, then wait for device end */
req->residual = stat->rescnt;
}
if (dstat == 0x08)
break;
case 0x04:
/* Device end interrupt. */
if ((raw = req->info) == NULL)
return; /* That shouldn't happen ... */
if (req->type == RAW3215_READ && raw->tty != NULL) {
unsigned int cchar;
tty = raw->tty;
count = 160 - req->residual;
if (MACHINE_IS_P390) {
slen = strnlen(raw->inbuf, RAW3215_INBUF_SIZE);
if (count > slen)
count = slen;
} else
if (count >= TTY_FLIPBUF_SIZE - tty->flip.count)
count = TTY_FLIPBUF_SIZE - tty->flip.count - 1;
EBCASC(raw->inbuf, count);
cchar = ctrlchar_handle(raw->inbuf, count, tty);
switch (cchar & CTRLCHAR_MASK) {
case CTRLCHAR_SYSRQ:
break;
case CTRLCHAR_CTRL:
tty->flip.count++;
*tty->flip.flag_buf_ptr++ = TTY_NORMAL;
*tty->flip.char_buf_ptr++ = cchar;
tty_flip_buffer_push(raw->tty);
break;
case CTRLCHAR_NONE:
memcpy(tty->flip.char_buf_ptr,
raw->inbuf, count);
if (count < 2 ||
(strncmp(raw->inbuf+count-2, "^n", 2) &&
strncmp(raw->inbuf+count-2, "\252n", 2)) ) {
/* don't add the auto \n */
tty->flip.char_buf_ptr[count] = '\n';
memset(tty->flip.flag_buf_ptr,
TTY_NORMAL, count + 1);
count++;
} else
count-=2;
tty->flip.char_buf_ptr += count;
tty->flip.flag_buf_ptr += count;
tty->flip.count += count;
tty_flip_buffer_push(raw->tty);
break;
}
} else if (req->type == RAW3215_WRITE) {
raw->count -= req->len;
raw->written -= req->len;
}
raw->flags &= ~RAW3215_WORKING;
raw3215_free_req(req);
/* check for empty wait */
if (waitqueue_active(&raw->empty_wait) &&
raw->queued_write == NULL &&
raw->queued_read == NULL) {
wake_up_interruptible(&raw->empty_wait);
}
raw3215_sched_bh(raw);
break;
default:
/* Strange interrupt, I'll do my best to clean up */
if ((raw = raw3215_find_info(irq)) == NULL)
return; /* That shouldn't happen ... */
if (raw == NULL) break;
if (req != NULL && req->type != RAW3215_FREE) {
if (req->type == RAW3215_WRITE) {
raw->count -= req->len;
raw->written -= req->len;
}
raw->flags &= ~RAW3215_WORKING;
raw3215_free_req(req);
}
raw->message = KERN_WARNING
"Spurious interrupt in in raw3215_irq "
"(dev %i, dev sts 0x%2x, sch sts 0x%2x)";
raw->msg_dstat = dstat;
raw->msg_cstat = cstat;
raw3215_sched_bh(raw);
}
return;
}
/*
* Wait until length bytes are available int the output buffer.
* Has to be called with the s390irq lock held. Can be called
* disabled.
*/
void raw3215_make_room(raw3215_info *raw, unsigned int length)
{
while (RAW3215_BUFFER_SIZE - raw->count < length) {
/* there might be a request pending */
raw->flags |= RAW3215_FLUSHING;
raw3215_mk_write_req(raw);
raw3215_try_io(raw);
raw->flags &= ~RAW3215_FLUSHING;
if (wait_cons_dev(raw->irq) != 0) {
/* that shouldn't happen */
raw->count = 0;
raw->written = 0;
}
/* Enough room freed up ? */
if (RAW3215_BUFFER_SIZE - raw->count >= length)
break;
/* there might be another cpu waiting for the lock */
s390irq_spin_unlock(raw->irq);
udelay(100);
s390irq_spin_lock(raw->irq);
}
}
/*
* String write routine for 3215 devices
*/
static int
raw3215_write(raw3215_info *raw, const char *str,
int from_user, unsigned int length)
{
unsigned long flags;
int ret, c;
int count;
ret = 0;
while (length > 0) {
s390irq_spin_lock_irqsave(raw->irq, flags);
count = (length > RAW3215_BUFFER_SIZE) ?
RAW3215_BUFFER_SIZE : length;
length -= count;
raw3215_make_room(raw, count);
/* copy string to output buffer and convert it to EBCDIC */
if (from_user) {
while (1) {
c = MIN(count,
MIN(RAW3215_BUFFER_SIZE - raw->count,
RAW3215_BUFFER_SIZE - raw->head));
if (c <= 0)
break;
c -= copy_from_user(raw->buffer + raw->head,
str, c);
if (c == 0) {
if (!ret)
ret = -EFAULT;
break;
}
ASCEBC(raw->buffer + raw->head, c);
raw->head = (raw->head + c) &
(RAW3215_BUFFER_SIZE - 1);
raw->count += c;
raw->line_pos += c;
str += c;
count -= c;
ret += c;
}
} else {
while (1) {
c = MIN(count,
MIN(RAW3215_BUFFER_SIZE - raw->count,
RAW3215_BUFFER_SIZE - raw->head));
if (c <= 0)
break;
memcpy(raw->buffer + raw->head, str, c);
ASCEBC(raw->buffer + raw->head, c);
raw->head = (raw->head + c) &
(RAW3215_BUFFER_SIZE - 1);
raw->count += c;
raw->line_pos += c;
str += c;
count -= c;
ret += c;
}
}
if (!(raw->flags & RAW3215_WORKING)) {
raw3215_mk_write_req(raw);
/* start or queue request */
raw3215_try_io(raw);
}
s390irq_spin_unlock_irqrestore(raw->irq, flags);
}
return ret;
}
/*
* Put character routine for 3215 devices
*/
static void raw3215_putchar(raw3215_info *raw, unsigned char ch)
{
unsigned long flags;
unsigned int length, i;
s390irq_spin_lock_irqsave(raw->irq, flags);
if (ch == '\t') {
length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE);
raw->line_pos += length;
ch = ' ';
} else if (ch == '\n') {
length = 1;
raw->line_pos = 0;
} else {
length = 1;
raw->line_pos++;
}
raw3215_make_room(raw, length);
for (i = 0; i < length; i++) {
raw->buffer[raw->head] = (char) _ascebc[(int) ch];
raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);
raw->count++;
}
if (!(raw->flags & RAW3215_WORKING)) {
raw3215_mk_write_req(raw);
/* start or queue request */
raw3215_try_io(raw);
}
s390irq_spin_unlock_irqrestore(raw->irq, flags);
}
/*
* Flush routine, it simply sets the flush flag and tries to start
* pending IO.
*/
static void raw3215_flush_buffer(raw3215_info *raw)
{
unsigned long flags;
s390irq_spin_lock_irqsave(raw->irq, flags);
if (raw->count > 0) {
raw->flags |= RAW3215_FLUSHING;
raw3215_try_io(raw);
raw->flags &= ~RAW3215_FLUSHING;
}
s390irq_spin_unlock_irqrestore(raw->irq, flags);
}
/*
* Fire up a 3215 device.
*/
static int raw3215_startup(raw3215_info *raw)
{
unsigned long flags;
if (raw->flags & RAW3215_ACTIVE)
return 0;
if (request_irq(raw->irq, raw3215_irq, SA_INTERRUPT,
"3215 terminal driver", &raw->devstat) != 0)
return -1;
raw->line_pos = 0;
raw->flags |= RAW3215_ACTIVE;
s390irq_spin_lock_irqsave(raw->irq, flags);
set_cons_dev(raw->irq);
raw3215_try_io(raw);
s390irq_spin_unlock_irqrestore(raw->irq, flags);
return 0;
}
/*
* Shutdown a 3215 device.
*/
static void raw3215_shutdown(raw3215_info *raw)
{
DECLARE_WAITQUEUE(wait, current);
unsigned long flags;
if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED))
return;
/* Wait for outstanding requests, then free irq */
s390irq_spin_lock_irqsave(raw->irq, flags);
if ((raw->flags & RAW3215_WORKING) ||
raw->queued_write != NULL ||
raw->queued_read != NULL) {
raw->flags |= RAW3215_CLOSING;
add_wait_queue(&raw->empty_wait, &wait);
current->state = TASK_INTERRUPTIBLE;
s390irq_spin_unlock_irqrestore(raw->irq, flags);
schedule();
s390irq_spin_lock_irqsave(raw->irq, flags);
remove_wait_queue(&raw->empty_wait, &wait);
current->state = TASK_RUNNING;
raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING);
}
free_irq(raw->irq, NULL);
s390irq_spin_unlock_irqrestore(raw->irq, flags);
}
static int
raw3215_find_dev(int number)
{
s390_dev_info_t dinfo;
int irq;
int count;
irq = get_irq_first();
count = 0;
while (count <= number && irq != -ENODEV) {
if (get_dev_info(irq, &dinfo) == -ENODEV)
break;
if (dinfo.devno == console_device ||
dinfo.sid_data.cu_type == 0x3215) {
count++;
if (count > number)
return irq;
}
irq = get_irq_next(irq);
}
return -1; /* console not found */
}
#ifdef CONFIG_TN3215_CONSOLE
/*
* Write a string to the 3215 console
*/
static void
con3215_write(struct console *co, const char *str, unsigned int count)
{
raw3215_info *raw;
int i;
if (count <= 0)
return;
raw = raw3215[0]; /* console 3215 is the first one */
while (count > 0) {
for (i = 0; i < count; i++)
if (str[i] == '\t' || str[i] == '\n')
break;
raw3215_write(raw, str, 0, i);
count -= i;
str += i;
if (count > 0) {
raw3215_putchar(raw, *str);
count--;
str++;
}
}
}
kdev_t con3215_device(struct console *c)
{
return MKDEV(TTY_MAJOR, c->index + 64 );
}
/*
* panic() calls console_unblank before the system enters a
* disabled, endless loop.
*/
void con3215_unblank(void)
{
raw3215_info *raw;
unsigned long flags;
raw = raw3215[0]; /* console 3215 is the first one */
s390irq_spin_lock_irqsave(raw->irq, flags);
raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
s390irq_spin_unlock_irqrestore(raw->irq, flags);
}
static int __init con3215_consetup(struct console *co, char *options)
{
return 0;
}
/*
* The console structure for the 3215 console
*/
static struct console con3215 = {
name: "ttyS",
index: 0,
write: con3215_write,
device: con3215_device,
unblank: con3215_unblank,
setup: con3215_consetup,
flags: CON_PRINTBUFFER,
};
#endif
/*
* tty3215_open
*
* This routine is called whenever a 3215 tty is opened.
*/
static int tty3215_open(struct tty_struct *tty, struct file * filp)
{
raw3215_info *raw;
int retval, line;
line = MINOR(tty->device) - tty->driver.minor_start;
if ((line < 0) || (line >= NR_3215))
return -ENODEV;
raw = raw3215[line];
if (raw == NULL) {
raw = kmalloc(sizeof(raw3215_info) +
RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA);
if (raw == NULL)
return -ENOMEM;
raw->irq = raw3215_find_dev(line);
if (raw->irq == -1) {
kfree(raw);
return -ENODEV;
}
raw->inbuf = (char *) raw + sizeof(raw3215_info);
memset(raw, 0, sizeof(raw3215_info));
raw->buffer = (char *) kmalloc(RAW3215_BUFFER_SIZE,
GFP_KERNEL|GFP_DMA);
if (raw->buffer == NULL) {
kfree(raw);
return -ENOMEM;
}
raw->tqueue.routine = raw3215_softint;
raw->tqueue.data = raw;
init_waitqueue_head(&raw->empty_wait);
raw3215[line] = raw;
}
tty->driver_data = raw;
raw->tty = tty;
tty->low_latency = 0; /* don't use bottom half for pushing chars */
/*
* Start up 3215 device
*/
retval = raw3215_startup(raw);
if (retval)
return retval;
return 0;
}
/*
* tty3215_close()
*
* This routine is called when the 3215 tty is closed. We wait
* for the remaining request to be completed. Then we clean up.
*/
static void tty3215_close(struct tty_struct *tty, struct file * filp)
{
raw3215_info *raw;
raw = (raw3215_info *) tty->driver_data;
if (raw == NULL || tty->count > 1)
return;
tty->closing = 1;
/* Shutdown the terminal */
raw3215_shutdown(raw);
tty->closing = 0;
raw->tty = NULL;
}
/*
* Returns the amount of free space in the output buffer.
*/
static int tty3215_write_room(struct tty_struct *tty)
{
raw3215_info *raw;
raw = (raw3215_info *) tty->driver_data;
/* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */
if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)
return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;
else
return 0;
}
/*
* String write routine for 3215 ttys
*/
static int tty3215_write(struct tty_struct * tty, int from_user,
const unsigned char *buf, int count)
{
raw3215_info *raw;
int ret = 0;
if (!tty)
return 0;
raw = (raw3215_info *) tty->driver_data;
ret = raw3215_write(raw, buf, from_user, count);
return ret;
}
/*
* Put character routine for 3215 ttys
*/
static void tty3215_put_char(struct tty_struct *tty, unsigned char ch)
{
raw3215_info *raw;
if (!tty)
return;
raw = (raw3215_info *) tty->driver_data;
raw3215_putchar(raw, ch);
}
static void tty3215_flush_chars(struct tty_struct *tty)
{
}
/*
* Returns the number of characters in the output buffer
*/
static int tty3215_chars_in_buffer(struct tty_struct *tty)
{
raw3215_info *raw;
raw = (raw3215_info *) tty->driver_data;
return raw->count;
}
static void tty3215_flush_buffer(struct tty_struct *tty)
{
raw3215_info *raw;
raw = (raw3215_info *) tty->driver_data;
raw3215_flush_buffer(raw);
tty_wakeup(tty);
}
/*
* Currently we don't have any io controls for 3215 ttys
*/
static int tty3215_ioctl(struct tty_struct *tty, struct file * file,
unsigned int cmd, unsigned long arg)
{
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
switch (cmd) {
default:
return -ENOIOCTLCMD;
}
return 0;
}
/*
* Disable reading from a 3215 tty
*/
static void tty3215_throttle(struct tty_struct * tty)
{
raw3215_info *raw;
raw = (raw3215_info *) tty->driver_data;
raw->flags |= RAW3215_THROTTLED;
}
/*
* Enable reading from a 3215 tty
*/
static void tty3215_unthrottle(struct tty_struct * tty)
{
raw3215_info *raw;
unsigned long flags;
raw = (raw3215_info *) tty->driver_data;
if (raw->flags & RAW3215_THROTTLED) {
s390irq_spin_lock_irqsave(raw->irq, flags);
raw->flags &= ~RAW3215_THROTTLED;
raw3215_try_io(raw);
s390irq_spin_unlock_irqrestore(raw->irq, flags);
}
}
/*
* Disable writing to a 3215 tty
*/
static void tty3215_stop(struct tty_struct *tty)
{
raw3215_info *raw;
raw = (raw3215_info *) tty->driver_data;
raw->flags |= RAW3215_STOPPED;
}
/*
* Enable writing to a 3215 tty
*/
static void tty3215_start(struct tty_struct *tty)
{
raw3215_info *raw;
unsigned long flags;
raw = (raw3215_info *) tty->driver_data;
if (raw->flags & RAW3215_STOPPED) {
s390irq_spin_lock_irqsave(raw->irq, flags);
raw->flags &= ~RAW3215_STOPPED;
raw3215_try_io(raw);
s390irq_spin_unlock_irqrestore(raw->irq, flags);
}
}
/*
* 3215 console initialization code called from console_init().
* NOTE: This is called before kmalloc is available.
*/
void __init con3215_init(void)
{
raw3215_info *raw;
raw3215_req *req;
int irq;
int i;
/* Check if 3215 is to be the console */
if (!CONSOLE_IS_3215)
return;
irq = raw3215_find_dev(0);
/* Set the console mode for VM */
if (MACHINE_IS_VM) {
cpcmd("TERM CONMODE 3215", NULL, 0);
cpcmd("TERM AUTOCR OFF", NULL, 0);
}
/* allocate 3215 request structures */
raw3215_freelist = NULL;
spin_lock_init(&raw3215_freelist_lock);
for (i = 0; i < NR_3215_REQ; i++) {
req = (raw3215_req *) alloc_bootmem_low(sizeof(raw3215_req));
req->next = raw3215_freelist;
raw3215_freelist = req;
}
ctrlchar_init();
#ifdef CONFIG_TN3215_CONSOLE
raw3215[0] = raw = (raw3215_info *)
alloc_bootmem_low(sizeof(raw3215_info));
memset(raw, 0, sizeof(raw3215_info));
raw->buffer = (char *) alloc_bootmem_low(RAW3215_BUFFER_SIZE);
raw->inbuf = (char *) alloc_bootmem_low(RAW3215_INBUF_SIZE);
/* Find the first console */
raw->irq = raw3215_find_dev(0);
raw->flags |= RAW3215_FIXED;
raw->tqueue.routine = raw3215_softint;
raw->tqueue.data = raw;
init_waitqueue_head(&raw->empty_wait);
/* Request the console irq */
if ( raw3215_startup(raw) != 0 )
raw->irq = -1;
if (raw->irq != -1) {
register_console(&con3215);
} else {
free_bootmem((unsigned long) raw->inbuf, RAW3215_INBUF_SIZE);
free_bootmem((unsigned long) raw->buffer, RAW3215_BUFFER_SIZE);
free_bootmem((unsigned long) raw, sizeof(raw3215_info));
raw3215[0] = NULL;
printk("Couldn't find a 3215 console device\n");
}
#endif
}
/*
* 3215 tty registration code called from tty_init().
* Most kernel services (incl. kmalloc) are available at this poimt.
*/
void __init tty3215_init(void)
{
/* Don't bother registering the tty if we already skipped the console */
if (!CONSOLE_IS_3215)
return;
/*
* Initialize the tty_driver structure
* Entries in tty3215_driver that are NOT initialized:
* proc_entry, set_termios, flush_buffer, set_ldisc, write_proc
*/
memset(&tty3215_driver, 0, sizeof(struct tty_driver));
tty3215_driver.magic = TTY_DRIVER_MAGIC;
tty3215_driver.driver_name = "tty3215";
tty3215_driver.name = "ttyS";
tty3215_driver.name_base = 0;
tty3215_driver.major = TTY_MAJOR;
tty3215_driver.minor_start = 64;
tty3215_driver.num = NR_3215;
tty3215_driver.type = TTY_DRIVER_TYPE_SYSTEM;
tty3215_driver.subtype = SYSTEM_TYPE_TTY;
tty3215_driver.init_termios = tty_std_termios;
tty3215_driver.init_termios.c_iflag = IGNBRK | IGNPAR;
tty3215_driver.init_termios.c_oflag = ONLCR | XTABS;
tty3215_driver.init_termios.c_lflag = ISIG;
tty3215_driver.flags = TTY_DRIVER_REAL_RAW;
tty3215_driver.refcount = &tty3215_refcount;
tty3215_driver.table = tty3215_table;
tty3215_driver.termios = tty3215_termios;
tty3215_driver.termios_locked = tty3215_termios_locked;
tty3215_driver.open = tty3215_open;
tty3215_driver.close = tty3215_close;
tty3215_driver.write = tty3215_write;
tty3215_driver.put_char = tty3215_put_char;
tty3215_driver.flush_chars = tty3215_flush_chars;
tty3215_driver.write_room = tty3215_write_room;
tty3215_driver.chars_in_buffer = tty3215_chars_in_buffer;
tty3215_driver.flush_buffer = tty3215_flush_buffer;
tty3215_driver.ioctl = tty3215_ioctl;
tty3215_driver.throttle = tty3215_throttle;
tty3215_driver.unthrottle = tty3215_unthrottle;
tty3215_driver.send_xchar = NULL;
tty3215_driver.set_termios = NULL;
tty3215_driver.stop = tty3215_stop;
tty3215_driver.start = tty3215_start;
tty3215_driver.hangup = NULL;
tty3215_driver.break_ctl = NULL;
tty3215_driver.wait_until_sent = NULL;
tty3215_driver.read_proc = NULL;
if (tty_register_driver(&tty3215_driver))
panic("Couldn't register tty3215 driver\n");
}
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