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Annotation of coherent/f/usr/include.78/sys/poll_clk.h, revision 1.1.1.1

1.1       root        1: /* (-lgl
                      2:  *     COHERENT 386 Device Driver Kit release 2.0
                      3:  *     Copyright (c) 1982, 1992 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: 
                     10: #ifndef        __SYS_POLL_CLK_H__
                     11: #define        __SYS_POLL_CLK_H__
                     12: 
                     13: #include <sys/silo.h>
                     14: /*
                     15:  * bit fields in com_usage[0..3]
                     16:  *   in_use is incremented each time open is attempted, and decremented
                     17:  *     when the open fails or the corresponding close completes
                     18:  *   irq is true when the port is in use (open or hanging) with interrupts
                     19:  *   has_irq is true when the irq vector for the port is usable;
                     20:  *     it is not ok to enable interrupts until this goes true!
                     21:  *   poll is true when the port is open for polling
                     22:  *   hcls is true while the port is doing last close
                     23:  *   ohlt is true while CTS flow control halts output
                     24:  */
                     25: typedef struct {
                     26:        short uart_type;        /* see US_* in ins8250.h */
                     27:        short in_use;
                     28:        int irq:1;
                     29:        int has_irq:1;
                     30:        int poll:1;
                     31:        int hcls:1;
                     32:        int ohlt:1;
                     33:        silo_t raw_in;
                     34:        silo_t raw_out;
                     35: } com_usage_t;
                     36: 
                     37: /* bits in poll_owner - at most one will be set at a time */
                     38: #define POLL_AL                1
                     39: #define POLL_HS                2
                     40: #define POLL_ASY       4
                     41: 
                     42: /*
                     43:  * The following variables are defined in support.c
                     44:  *
                     45:  * "poll_rate" is the polling rate in HZ, 0 if no polling being done
                     46:  * "poll_owner" is a bit array so only one driver at a time can
                     47:  *   use an alternate clock routine
                     48:  * "com_usage" is used only by al0/al1 drivers
                     49:  */
                     50: extern com_usage_t     com_usage[];    /* COM_UNUSED/COM_IRQ/COM_POLLED */
                     51: extern int     poll_rate;      /* used by "prate" command */
                     52: extern int     poll_owner;     /* checked during *open() of port */
                     53: #endif

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