/*
- * drivers/s390/char/con3215.c
- * 3215 line mode terminal driver.
+ * 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),
+ * Copyright IBM Corp. 1999, 2009
+ * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
*
- * Updated:
- * Aug-2000: Added tab support
- * Dan Morrison, IBM Corporation (dmorriso@cse.buffalo.edu)
+ * Updated:
+ * Aug-2000: Added tab support
+ * Dan Morrison, IBM Corporation <dmorriso@cse.buffalo.edu>
*/
#include <linux/module.h>
#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_FROZEN 256 /* set if 3215 is frozen for suspend */
#define TAB_STOP_SIZE 8 /* tab stop size */
/*
* Get a request structure from the free list
*/
-static inline struct raw3215_req *
-raw3215_alloc_req(void) {
+static inline struct raw3215_req *raw3215_alloc_req(void)
+{
struct raw3215_req *req;
unsigned long flags;
/*
* Put a request structure back to the free list
*/
-static inline void
-raw3215_free_req(struct raw3215_req *req) {
+static inline void raw3215_free_req(struct raw3215_req *req)
+{
unsigned long flags;
if (req->type == RAW3215_FREE)
* because a 3215 terminal won't accept a new read before the old one is
* completed.
*/
-static void
-raw3215_mk_read_req(struct raw3215_info *raw)
+static void raw3215_mk_read_req(struct raw3215_info *raw)
{
struct raw3215_req *req;
struct ccw1 *ccw;
* 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(struct raw3215_info *raw)
+static void raw3215_mk_write_req(struct raw3215_info *raw)
{
struct raw3215_req *req;
struct ccw1 *ccw;
/*
* Start a read or a write request
*/
-static void
-raw3215_start_io(struct raw3215_info *raw)
+static void raw3215_start_io(struct raw3215_info *raw)
{
struct raw3215_req *req;
int res;
/*
* Function to start a delayed output after RAW3215_TIMEOUT seconds
*/
-static void
-raw3215_timeout(unsigned long __data)
+static void raw3215_timeout(unsigned long __data)
{
struct raw3215_info *raw = (struct raw3215_info *) __data;
unsigned long 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);
+ if (!(raw->flags & RAW3215_FROZEN)) {
+ raw3215_mk_write_req(raw);
+ raw3215_start_io(raw);
+ }
}
spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
}
* amount of data is bigger than RAW3215_MIN_WRITE. If a write is not
* done immediately a timer is started with a delay of RAW3215_TIMEOUT.
*/
-static inline void
-raw3215_try_io(struct raw3215_info *raw)
+static inline void raw3215_try_io(struct raw3215_info *raw)
{
- if (!(raw->flags & RAW3215_ACTIVE))
+ if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FROZEN))
return;
if (raw->queued_read != NULL)
raw3215_start_io(raw);
/*
* Interrupt routine, called from common io layer
*/
-static void
-raw3215_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
+static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,
+ struct irb *irb)
{
struct raw3215_info *raw;
struct raw3215_req *req;
return;
}
+/*
+ * Drop the oldest line from the output buffer.
+ */
+static void raw3215_drop_line(struct raw3215_info *raw)
+{
+ int ix;
+ char ch;
+
+ BUG_ON(raw->written != 0);
+ ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1);
+ while (raw->count > 0) {
+ ch = raw->buffer[ix];
+ ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1);
+ raw->count--;
+ if (ch == 0x15)
+ break;
+ }
+ raw->head = ix;
+}
+
/*
* Wait until length bytes are available int the output buffer.
* Has to be called with the s390irq lock held. Can be called
* disabled.
*/
-static void
-raw3215_make_room(struct raw3215_info *raw, unsigned int length)
+static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
{
while (RAW3215_BUFFER_SIZE - raw->count < length) {
+ /* While console is frozen for suspend we have no other
+ * choice but to drop message from the buffer to make
+ * room for even more messages. */
+ if (raw->flags & RAW3215_FROZEN) {
+ raw3215_drop_line(raw);
+ continue;
+ }
/* there might be a request pending */
raw->flags |= RAW3215_FLUSHING;
raw3215_mk_write_req(raw);
/*
* String write routine for 3215 devices
*/
-static void
-raw3215_write(struct raw3215_info *raw, const char *str, unsigned int length)
+static void raw3215_write(struct raw3215_info *raw, const char *str,
+ unsigned int length)
{
unsigned long flags;
int c, count;
/*
* Put character routine for 3215 devices
*/
-static void
-raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
+static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch)
{
unsigned long flags;
unsigned int length, i;
* Flush routine, it simply sets the flush flag and tries to start
* pending IO.
*/
-static void
-raw3215_flush_buffer(struct raw3215_info *raw)
+static void raw3215_flush_buffer(struct raw3215_info *raw)
{
unsigned long flags;
/*
* Fire up a 3215 device.
*/
-static int
-raw3215_startup(struct raw3215_info *raw)
+static int raw3215_startup(struct raw3215_info *raw)
{
unsigned long flags;
/*
* Shutdown a 3215 device.
*/
-static void
-raw3215_shutdown(struct raw3215_info *raw)
+static void raw3215_shutdown(struct raw3215_info *raw)
{
DECLARE_WAITQUEUE(wait, current);
unsigned long flags;
spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
}
-static int
-raw3215_probe (struct ccw_device *cdev)
+static int raw3215_probe (struct ccw_device *cdev)
{
struct raw3215_info *raw;
int line;
return 0;
}
-static void
-raw3215_remove (struct ccw_device *cdev)
+static void raw3215_remove (struct ccw_device *cdev)
{
struct raw3215_info *raw;
}
}
-static int
-raw3215_set_online (struct ccw_device *cdev)
+static int raw3215_set_online (struct ccw_device *cdev)
{
struct raw3215_info *raw;
return raw3215_startup(raw);
}
-static int
-raw3215_set_offline (struct ccw_device *cdev)
+static int raw3215_set_offline (struct ccw_device *cdev)
{
struct raw3215_info *raw;
return 0;
}
+static int raw3215_pm_stop(struct ccw_device *cdev)
+{
+ struct raw3215_info *raw;
+ unsigned long flags;
+
+ /* Empty the output buffer, then prevent new I/O. */
+ raw = cdev->dev.driver_data;
+ spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
+ raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
+ raw->flags |= RAW3215_FROZEN;
+ spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
+ return 0;
+}
+
+static int raw3215_pm_start(struct ccw_device *cdev)
+{
+ struct raw3215_info *raw;
+ unsigned long flags;
+
+ /* Allow I/O again and flush output buffer. */
+ raw = cdev->dev.driver_data;
+ spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
+ raw->flags &= ~RAW3215_FROZEN;
+ raw->flags |= RAW3215_FLUSHING;
+ raw3215_try_io(raw);
+ raw->flags &= ~RAW3215_FLUSHING;
+ spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
+ return 0;
+}
+
static struct ccw_device_id raw3215_id[] = {
{ CCW_DEVICE(0x3215, 0) },
{ /* end of list */ },
.remove = &raw3215_remove,
.set_online = &raw3215_set_online,
.set_offline = &raw3215_set_offline,
+ .freeze = &raw3215_pm_stop,
+ .thaw = &raw3215_pm_start,
+ .restore = &raw3215_pm_start,
};
#ifdef CONFIG_TN3215_CONSOLE
/*
* Write a string to the 3215 console
*/
-static void
-con3215_write(struct console *co, const char *str, unsigned int count)
+static void con3215_write(struct console *co, const char *str,
+ unsigned int count)
{
struct raw3215_info *raw;
int i;
* panic() calls con3215_flush through a panic_notifier
* before the system enters a disabled, endless loop.
*/
-static void
-con3215_flush(void)
+static void con3215_flush(void)
{
struct raw3215_info *raw;
unsigned long flags;
raw = raw3215[0]; /* console 3215 is the first one */
+ if (raw->flags & RAW3215_FROZEN)
+ /* The console is still frozen for suspend. */
+ if (ccw_device_force_console())
+ /* Forcing didn't work, no panic message .. */
+ return;
spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
* 3215 console initialization code called from console_init().
* NOTE: This is called before kmalloc is available.
*/
-static int __init
-con3215_init(void)
+static int __init con3215_init(void)
{
struct ccw_device *cdev;
struct raw3215_info *raw;
*
* This routine is called whenever a 3215 tty is opened.
*/
-static int
-tty3215_open(struct tty_struct *tty, struct file * filp)
+static int tty3215_open(struct tty_struct *tty, struct file * filp)
{
struct raw3215_info *raw;
int retval, line;
* 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)
+static void tty3215_close(struct tty_struct *tty, struct file * filp)
{
struct raw3215_info *raw;
/*
* Returns the amount of free space in the output buffer.
*/
-static int
-tty3215_write_room(struct tty_struct *tty)
+static int tty3215_write_room(struct tty_struct *tty)
{
struct raw3215_info *raw;
/*
* String write routine for 3215 ttys
*/
-static int
-tty3215_write(struct tty_struct * tty,
- const unsigned char *buf, int count)
+static int tty3215_write(struct tty_struct * tty,
+ const unsigned char *buf, int count)
{
struct raw3215_info *raw;
/*
* Put character routine for 3215 ttys
*/
-static int
-tty3215_put_char(struct tty_struct *tty, unsigned char ch)
+static int tty3215_put_char(struct tty_struct *tty, unsigned char ch)
{
struct raw3215_info *raw;
return 1;
}
-static void
-tty3215_flush_chars(struct tty_struct *tty)
+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)
+static int tty3215_chars_in_buffer(struct tty_struct *tty)
{
struct raw3215_info *raw;
return raw->count;
}
-static void
-tty3215_flush_buffer(struct tty_struct *tty)
+static void tty3215_flush_buffer(struct tty_struct *tty)
{
struct raw3215_info *raw;
/*
* 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)
+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;
/*
* Disable reading from a 3215 tty
*/
-static void
-tty3215_throttle(struct tty_struct * tty)
+static void tty3215_throttle(struct tty_struct * tty)
{
struct raw3215_info *raw;
/*
* Enable reading from a 3215 tty
*/
-static void
-tty3215_unthrottle(struct tty_struct * tty)
+static void tty3215_unthrottle(struct tty_struct * tty)
{
struct raw3215_info *raw;
unsigned long flags;
/*
* Disable writing to a 3215 tty
*/
-static void
-tty3215_stop(struct tty_struct *tty)
+static void tty3215_stop(struct tty_struct *tty)
{
struct raw3215_info *raw;
/*
* Enable writing to a 3215 tty
*/
-static void
-tty3215_start(struct tty_struct *tty)
+static void tty3215_start(struct tty_struct *tty)
{
struct raw3215_info *raw;
unsigned long flags;
* 3215 tty registration code called from tty_init().
* Most kernel services (incl. kmalloc) are available at this poimt.
*/
-static int __init
-tty3215_init(void)
+static int __init tty3215_init(void)
{
struct tty_driver *driver;
int ret;
return 0;
}
-static void __exit
-tty3215_exit(void)
+static void __exit tty3215_exit(void)
{
tty_unregister_driver(tty3215_driver);
put_tty_driver(tty3215_driver);
git.samba.org / sfrench / cifs-2.6.git / blobdiff