leds.c revision 1.10 
1/*	$NetBSD: leds.c,v 1.10 2018/09/03 16:29:28 riastradh Exp $	*/
2
3/*-
4 * Copyright (c) 1997 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Gordon W. Ross and der Mouse.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * Functions to flash the LEDs with some pattern.
34 */
35
36#include <sys/cdefs.h>
37__KERNEL_RCSID(0, "$NetBSD: leds.c,v 1.10 2018/09/03 16:29:28 riastradh Exp $");
38
39#include <sys/param.h>
40#include <sys/systm.h>
41#include <sys/cpu.h>
42#include <sys/conf.h>
43#include <sys/device.h>
44#include <sys/malloc.h>
45#include <sys/proc.h>
46
47#include <machine/sid.h>
48#include <machine/leds.h>
49
50#include "opt_cputype.h"
51
52static volatile u_short *diagreg = 0;
53static u_char led_countdown = 0;
54static u_char led_px = 0;
55
56/*
57 * Initial value is the default pattern set.
58 */
59struct led_patterns ledpat = {
60	16,	/* divisor */
61	12,	/* patlen */
62	{	/* patterns */
63		0x03, 0x06, 0x0c, 0x18,
64		0x30, 0x60, 0xc0, 0x60,
65		0x30, 0x18, 0x0c, 0x06,
66	}
67};
68
69void
70ledsattach(int a)
71{
72	switch (vax_boardtype) {
73#if VAX46 || VAXANY
74	case VAX_BTYP_46: {
75		extern struct vs_cpu *ka46_cpu;
76		diagreg = (volatile u_short *)(&ka46_cpu->vc_diagdsp);
77		break;
78		}
79#endif
80#if VAX48 || VAXANY
81	case VAX_BTYP_48: {
82		extern struct vs_cpu *ka48_cpu;
83		diagreg = (volatile u_short *)(&ka48_cpu->vc_diagdsp);
84		break;
85		}
86#endif
87#if VAX49 || VAXANY
88	case VAX_BTYP_49:
89		diagreg = (volatile u_short *)vax_map_physmem(0x25800000, 1);
90		diagreg += 2;
91		break;
92#endif
93	default:
94		return;
95	}
96
97	/* Turn on some lights. */
98	leds_intr();
99}
100
101/*
102 * This is called by the clock interrupt.
103 */
104void
105leds_intr(void)
106{
107	register u_char i;
108
109	if (diagreg == 0)
110		return;
111
112	if (led_countdown) {
113		led_countdown--;
114		return;
115	}
116
117	led_countdown = ledpat.divisor - 1;
118	i = led_px;
119
120	*diagreg = ~ledpat.pat[i];
121
122	i = i+1;
123	if (i == ledpat.patlen)
124		i = 0;
125	led_px = i;
126}
127
128/*
129 * This is called by mem.c to handle /dev/leds
130 */
131int
132leds_uio(struct uio *uio)
133{
134	int cnt, error;
135	int off;	/* NOT off_t */
136	char *va;
137
138	off = uio->uio_offset;
139	if ((off < 0) || (off > sizeof(ledpat)))
140		return (EIO);
141
142	cnt = uimin(uio->uio_resid, (sizeof(ledpat) - off));
143	if (cnt == 0)
144		return (0); /* EOF */
145
146
147	va = (char *)&ledpat;
148	va = va + off;
149	error = uiomove(va, cnt, uio);
150
151	return (error);
152}
153
154