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/* (-lgl
 * 	COHERENT Driver Kit Version 1.1.0
 * 	Copyright (c) 1982, 1990 by Mark Williams Company.
 * 	All rights reserved. May not be copied without permission.
 -lgl) */
/*
 * poll_clk.h - include file for drivers using altclk_in()/altclk_out()
 *
 * $Log: poll_clk.h.SAV,v $
 * Revision 1.1.1.1  2019/05/29 04:56:40  root
 * coherent
 *
 * Revision 1.4  91/12/10  07:57:01  hal
 * Add uart_type and has_irq usage fields.
 * Change in_use from boolean (:1) to short.
 * 
 * Revision 1.3  91/11/14  14:11:13  hal
 * Re-entrancy fix.  Make com_usage bit field.
 * 
 * Revision 1.2  91/06/04  14:36:10  hal
 * Imports are from support.c.
 * 
 * Revision 1.1  91/06/04  14:34:49  hal
 * Initial version - imported from tty.c.
 * 
 */

#ifndef	POLL_CLK_H
#define	POLL_CLK_H

/*
 * bit fields in com_usage[0..3]
 *   in_use is incremented each time open is attempted, and decremented
 *     when the open fails or the corresponding close completes
 *   irq is true when the port is in use (open or hanging) with interrupts
 *   has_irq is true when the irq vector for the port is usable;
 *     it is not ok to enable interrupts until this goes true!
 *   poll is true when the port is open for polling
 *   hcls is true while the port is doing last close
 *   ohlt is true while CTS flow control halts output
 */
typedef struct {
	short uart_type;	/* see US_* in ins8250.h */
	short in_use;
	int irq:1;
	int has_irq:1;
	int poll:1;
	int hcls:1;
	int ohlt:1;
} com_usage_t;

/* bits in poll_owner - at most one will be set at a time */
#define POLL_AL		1
#define POLL_HS		2

/*
 * The following variables are defined in support.c
 *
 * "poll_rate" is the polling rate in HZ, 0 if no polling being done
 * "poll_owner" is a bit array so only one driver at a time can
 *   use an alternate clock routine
 * "com_usage" is used only by al0/al1 drivers
 */
extern com_usage_t	com_usage[];    /* COM_UNUSED/COM_IRQ/COM_POLLED */
extern int	poll_rate;	/* used by "prate" command */
extern int	poll_owner;	/* checked during *open() of port */
#endif

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