diff options
| -rw-r--r-- | drivers/s390/char/con3215.c | 205 |
1 files changed, 120 insertions, 85 deletions
diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c index 9ab06e0dad4..b79f31add39 100644 --- a/drivers/s390/char/con3215.c +++ b/drivers/s390/char/con3215.c @@ -1,14 +1,12 @@ /* - * 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> @@ -56,6 +54,7 @@ #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 */ @@ -111,8 +110,8 @@ static struct tty_driver *tty3215_driver; /* * 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; @@ -126,8 +125,8 @@ raw3215_alloc_req(void) { /* * 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) @@ -145,8 +144,7 @@ raw3215_free_req(struct raw3215_req *req) { * 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; @@ -174,8 +172,7 @@ raw3215_mk_read_req(struct raw3215_info *raw) * 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; @@ -251,8 +248,7 @@ raw3215_mk_write_req(struct raw3215_info *raw) /* * 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; @@ -290,8 +286,7 @@ raw3215_start_io(struct raw3215_info *raw) /* * 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; @@ -300,8 +295,10 @@ raw3215_timeout(unsigned long __data) 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); } @@ -312,10 +309,9 @@ raw3215_timeout(unsigned long __data) * 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); @@ -359,8 +355,8 @@ static void raw3215_next_io(struct raw3215_info *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; @@ -459,14 +455,40 @@ raw3215_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) } /* + * 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); @@ -488,8 +510,8 @@ raw3215_make_room(struct raw3215_info *raw, unsigned int length) /* * 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; @@ -529,8 +551,7 @@ raw3215_write(struct raw3215_info *raw, const char *str, unsigned int length) /* * 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; @@ -566,8 +587,7 @@ raw3215_putchar(struct raw3215_info *raw, unsigned char ch) * 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; @@ -583,8 +603,7 @@ raw3215_flush_buffer(struct raw3215_info *raw) /* * Fire up a 3215 device. */ -static int -raw3215_startup(struct raw3215_info *raw) +static int raw3215_startup(struct raw3215_info *raw) { unsigned long flags; @@ -602,8 +621,7 @@ raw3215_startup(struct raw3215_info *raw) /* * 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; @@ -628,8 +646,7 @@ raw3215_shutdown(struct raw3215_info *raw) 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; @@ -675,8 +692,7 @@ raw3215_probe (struct ccw_device *cdev) return 0; } -static void -raw3215_remove (struct ccw_device *cdev) +static void raw3215_remove (struct ccw_device *cdev) { struct raw3215_info *raw; @@ -689,8 +705,7 @@ raw3215_remove (struct ccw_device *cdev) } } -static int -raw3215_set_online (struct ccw_device *cdev) +static int raw3215_set_online (struct ccw_device *cdev) { struct raw3215_info *raw; @@ -701,8 +716,7 @@ raw3215_set_online (struct ccw_device *cdev) 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; @@ -715,6 +729,36 @@ raw3215_set_offline (struct ccw_device *cdev) 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 */ }, @@ -728,14 +772,17 @@ static struct ccw_driver raw3215_ccw_driver = { .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; @@ -768,13 +815,17 @@ static struct tty_driver *con3215_device(struct console *c, int *index) * 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); @@ -811,8 +862,7 @@ static struct console con3215 = { * 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; @@ -875,8 +925,7 @@ console_initcall(con3215_init); * * 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; @@ -909,8 +958,7 @@ tty3215_open(struct tty_struct *tty, struct file * filp) * 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; @@ -927,8 +975,7 @@ tty3215_close(struct tty_struct *tty, struct file * filp) /* * 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; @@ -944,9 +991,8 @@ tty3215_write_room(struct tty_struct *tty) /* * 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; @@ -960,8 +1006,7 @@ tty3215_write(struct tty_struct * tty, /* * 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; @@ -972,16 +1017,14 @@ tty3215_put_char(struct tty_struct *tty, unsigned char ch) 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; @@ -989,8 +1032,7 @@ tty3215_chars_in_buffer(struct tty_struct *tty) 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; @@ -1002,9 +1044,8 @@ tty3215_flush_buffer(struct tty_struct *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) +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; @@ -1019,8 +1060,7 @@ tty3215_ioctl(struct tty_struct *tty, struct file * file, /* * 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; @@ -1031,8 +1071,7 @@ tty3215_throttle(struct tty_struct * tty) /* * 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; @@ -1049,8 +1088,7 @@ tty3215_unthrottle(struct tty_struct * tty) /* * 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; @@ -1061,8 +1099,7 @@ tty3215_stop(struct tty_struct *tty) /* * 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; @@ -1096,8 +1133,7 @@ static const struct tty_operations tty3215_ops = { * 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; @@ -1142,8 +1178,7 @@ tty3215_init(void) return 0; } -static void __exit -tty3215_exit(void) +static void __exit tty3215_exit(void) { tty_unregister_driver(tty3215_driver); put_tty_driver(tty3215_driver); |