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Annotation of coherent/d/PS2_KERNEL/include/sys/poll_clk.h, revision 1.1.1.1

1.1       root        1: /* (-lgl
                      2:  *     COHERENT Driver Kit Version 1.1.0
                      3:  *     Copyright (c) 1982, 1990 by Mark Williams Company.
                      4:  *     All rights reserved. May not be copied without permission.
                      5:  -lgl) */
                      6: /*
                      7:  * poll_clk.h - include file for drivers using altclk_in()/altclk_out()
                      8:  *
                      9:  * $Log:       poll_clk.h,v $
                     10:  * Revision 1.1  92/07/31  16:07:22  root
                     11:  * Initial revision
                     12:  * 
                     13:  * Revision 1.4  91/12/10  07:57:01  hal
                     14:  * Add uart_type and has_irq usage fields.
                     15:  * Change in_use from boolean (:1) to short.
                     16:  * 
                     17:  * Revision 1.3  91/11/14  14:11:13  hal
                     18:  * Re-entrancy fix.  Make com_usage bit field.
                     19:  * 
                     20:  * Revision 1.2  91/06/04  14:36:10  hal
                     21:  * Imports are from support.c.
                     22:  * 
                     23:  * Revision 1.1  91/06/04  14:34:49  hal
                     24:  * Initial version - imported from tty.c.
                     25:  * 
                     26:  */
                     27: 
                     28: #ifndef        POLL_CLK_H
                     29: #define        POLL_CLK_H
                     30: 
                     31: #include <sys/silo.h>
                     32: /*
                     33:  * bit fields in com_usage[0..3]
                     34:  *   in_use is incremented each time open is attempted, and decremented
                     35:  *     when the open fails or the corresponding close completes
                     36:  *   irq is true when the port is in use (open or hanging) with interrupts
                     37:  *   has_irq is true when the irq vector for the port is usable;
                     38:  *     it is not ok to enable interrupts until this goes true!
                     39:  *   poll is true when the port is open for polling
                     40:  *   hcls is true while the port is doing last close
                     41:  *   ohlt is true while CTS flow control halts output
                     42:  */
                     43: typedef struct {
                     44:        short uart_type;        /* see US_* in ins8250.h */
                     45:        short in_use;
                     46:        int irq:1;
                     47:        int has_irq:1;
                     48:        int poll:1;
                     49:        int hcls:1;
                     50:        int ohlt:1;
                     51:        silo_t raw_in;
                     52:        silo_t raw_out;
                     53: } com_usage_t;
                     54: 
                     55: /* bits in poll_owner - at most one will be set at a time */
                     56: #define POLL_AL                1
                     57: #define POLL_HS                2
                     58: #define POLL_ASY       4
                     59: 
                     60: /*
                     61:  * The following variables are defined in support.c
                     62:  *
                     63:  * "poll_rate" is the polling rate in HZ, 0 if no polling being done
                     64:  * "poll_owner" is a bit array so only one driver at a time can
                     65:  *   use an alternate clock routine
                     66:  * "com_usage" is used only by al0/al1 drivers
                     67:  */
                     68: extern com_usage_t     com_usage[];    /* COM_UNUSED/COM_IRQ/COM_POLLED */
                     69: extern int     poll_rate;      /* used by "prate" command */
                     70: extern int     poll_owner;     /* checked during *open() of port */
                     71: #endif

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