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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 /*
     23  * Copyright (c) 1999-2000 by Sun Microsystems, Inc.
     24  * All rights reserved.
     25  */
     26 
     27 #ifndef _SYS_BBC_BEEP_H
     28 #define	_SYS_BBC_BEEP_H
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 #ifdef __cplusplus
     33 extern "C" {
     34 #endif
     35 
     36 /*
     37  * bbc_beep.h : BBC beep driver's header file.
     38  */
     39 
     40 /* Keyboard Beep Control Register values */
     41 #define	BBC_BEEP_ON		0x01
     42 #define	BBC_BEEP_OFF		0x00
     43 
     44 /*
     45  * Keyboard Beep Counter Register value :
     46  * The most significant of [18..10] selects the bit of
     47  * the BBC free running counter (updated on half the system
     48  * clock) that is used to generate the audio signal. So, bit[10]
     49  * generates a signal at 1/(2^12) the system frequency, and
     50  * bit[18], at 1/(2^20). So if s = system frequency(in MHz),
     51  * it can generate frequencies in the range (s >> 10) Hz to
     52  * (s >> 2) Hz.
     53  */
     54 #define	BBC_BEEP_MIN_SHIFT	20
     55 #define	BBC_BEEP_MAX_SHIFT	12
     56 #define	BBC_BEEP_MSBIT		18
     57 
     58 typedef volatile struct bbc_beep_regs {
     59 
     60 	/* Beep ON/OFF register */
     61 	uint8_t		bbc_beep_control;
     62 
     63 	/* Reserved */
     64 	uint8_t		reserved;
     65 
     66 	/* Register to set the frequency */
     67 	uint8_t		bbc_beep_counter[4];
     68 
     69 } bbc_beep_regs_t;
     70 
     71 /*
     72  * Beep driver state structure
     73  */
     74 typedef struct bbc_beep_state {
     75 
     76 	/* Dip of bbc_beep device */
     77 	dev_info_t		*bbc_beep_dip;
     78 
     79 	/* Beep registers */
     80 	bbc_beep_regs_t		*bbc_beep_regsp;
     81 
     82 	/* Register handle */
     83 	ddi_acc_handle_t	bbc_beep_regs_handle;
     84 
     85 	/* If beeper is active or not */
     86 	int			bbc_beep_mode;
     87 
     88 	} bbc_beep_state_t;
     89 
     90 #define	BEEP_WRITE_CTRL_REG(val) ddi_put8(bbc_beeptr->bbc_beep_regs_handle, \
     91 		((uint8_t *)&bbc_beeptr->bbc_beep_regsp->bbc_beep_control), \
     92 					((int8_t)(val)))
     93 #define	BEEP_WRITE_COUNTER_REG(no, val) \
     94 		ddi_put8(bbc_beeptr->bbc_beep_regs_handle, \
     95 	((uint8_t *)&bbc_beeptr->bbc_beep_regsp->bbc_beep_counter[no]), \
     96 					((int8_t)(val)))
     97 
     98 #define	BEEP_UNIT(dev)	(getminor((dev)))
     99 
    100 #ifdef __cplusplus
    101 }
    102 #endif
    103 
    104 #endif /* _SYS_BBC_BEEP_H */
    105