[PATCH] cyclades async driver update

This patch is the first of several planned fixes for the cyclades
multiserial cards driver.

Its mostly a sync with in-house driver:

- Prevent users from opening non-existing Z ports
- Implement special XON/XOFF character handling in Z cards
- Prevent data-loss on Z cards
- Throttling fix for Z card
- Only throttle if CTS/RTS are set
- Fix accounting of received data

Kudos to Cyclades R&D

include/linux/cyclades.h

@@ -7,6 +7,10 @@
  *
  * This file contains the general definitions for the cyclades.c driver
  *$Log: cyclades.h,v $
+ *Revision 3.1  2002/01/29 11:36:16  henrique
+ *added throttle field on struct cyclades_port to indicate whether the
+ *port is throttled or not
+ *
  *Revision 3.1  2000/04/19 18:52:52  ivan
  *converted address fields to unsigned long and added fields for physical
  *addresses on cyclades_card structure;
@@ -141,7 +145,7 @@ struct CYZ_BOOT_CTRL {
 /****************** ****************** *******************/
 /*
  *	The data types defined below are used in all ZFIRM interface
- *	data structures. They accommodate differences between HW
+ *	data structures. They accomodate differences between HW
  *	architectures and compilers.
  */
 
@@ -604,6 +608,7 @@ struct cyclades_port {
 	wait_queue_head_t       close_wait;
 	wait_queue_head_t       shutdown_wait;
 	wait_queue_head_t       delta_msr_wait;
+	int throttle;
 };
 
 /*