1 /* $NetBSD: timer_hb.c,v 1.21 2024/01/15 20:21:50 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 1996 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
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 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: timer_hb.c,v 1.21 2024/01/15 20:21:50 thorpej Exp $");
34
35 #include <sys/param.h>
36 #include <sys/kernel.h>
37 #include <sys/systm.h>
38 #include <sys/device.h>
39 #include <sys/intr.h>
40
41 #include <uvm/uvm_extern.h>
42
43 #include <machine/cpu.h>
44 #include <machine/bus.h>
45 #include <machine/vectors.h>
46
47 #include <dev/clock_subr.h>
48
49 #include <news68k/news68k/isr.h>
50 #include <news68k/news68k/clockvar.h>
51
52 #include <news68k/dev/hbvar.h>
53
54 #include "ioconf.h"
55
56 /*
57 * interrupt level for clock
58 */
59
60 #define TIMER_LEVEL 6
61 #define TIMER_SIZE 8 /* XXX */
62
63 static int timer_hb_match(device_t, cfdata_t, void *);
64 static void timer_hb_attach(device_t, device_t, void *);
65 static void timer_hb_initclocks(int, int);
66 void clock_intr(struct clockframe);
67
68 static inline void leds_intr(void);
69
70 extern void _isr_clock(void); /* locore.s */
71
72 CFATTACH_DECL_NEW(timer_hb, 0,
73 timer_hb_match, timer_hb_attach, NULL, NULL);
74
75 static volatile uint8_t *ctrl_timer; /* XXX */
76
77 extern volatile u_char *ctrl_led; /* XXX */
78
79 static int
timer_hb_match(device_t parent,cfdata_t cf,void * aux)80 timer_hb_match(device_t parent, cfdata_t cf, void *aux)
81 {
82 struct hb_attach_args *ha = aux;
83 static int timer_hb_matched;
84
85 /* Only one timer, please. */
86 if (timer_hb_matched)
87 return 0;
88
89 if (strcmp(ha->ha_name, timer_cd.cd_name))
90 return 0;
91
92 if (ha->ha_ipl == -1)
93 ha->ha_ipl = TIMER_LEVEL;
94
95 ha->ha_size = TIMER_SIZE;
96
97 timer_hb_matched = 1;
98
99 return 1;
100 }
101
102 static void
timer_hb_attach(device_t parent,device_t self,void * aux)103 timer_hb_attach(device_t parent, device_t self, void *aux)
104 {
105 struct hb_attach_args *ha = aux;
106
107 if (ha->ha_ipl != TIMER_LEVEL)
108 panic("clock_hb_attach: wrong interrupt level");
109
110 ctrl_timer = (uint8_t *)(ha->ha_address); /* XXX needs bus_space */
111
112 printf("\n");
113
114 timer_config(timer_hb_initclocks);
115
116 #if 0 /* XXX this will be done in timer_hb_initclocks() */
117 vec_set_entry(VECI_INTRAV0 + ha->ha_ipl, _isr_clock);
118 #endif
119 }
120
121 /*
122 * Set up the interval timer (enable clock interrupts).
123 * Leave stathz 0 since there is no secondary clock available.
124 * Note that clock interrupts MUST STAY DISABLED until here.
125 */
126 static void
timer_hb_initclocks(int prof,int stat)127 timer_hb_initclocks(int prof, int stat)
128 {
129 int s;
130
131 s = splhigh();
132
133 /* Install isr (in locore.s) that calls clock_intr(). */
134 vec_set_entry(VECI_INTRAV0 + TIMER_LEVEL, _isr_clock);
135
136 /* enable the clock */
137 *ctrl_timer = 1;
138 splx(s);
139 }
140
141 /*
142 * Clock interrupt handler.
143 * This is called by the "custom" interrupt handler.
144 *
145 * from sun3/sun3x/clock.c -tsutsui
146 */
147 void
clock_intr(struct clockframe cf)148 clock_intr(struct clockframe cf)
149 {
150 #ifdef LED_IDLE_CHECK
151 extern char _Idle[]; /* locore.s */
152 #endif
153
154 /* Pulse the clock intr. enable low. */
155 *ctrl_timer = 0;
156 *ctrl_timer = 1;
157
158 m68k_count_intr(TIMER_LEVEL);
159
160 /* Entertainment! */
161 #ifdef LED_IDLE_CHECK
162 if (cf.cf_pc == (long)_Idle)
163 #endif
164 leds_intr();
165
166 /* Call common clock interrupt handler. */
167 hardclock(&cf);
168 }
169
170 /* heartbeat LED */
171 #define LED0 0x01
172 #define LED1 0x02
173
174 static inline void
leds_intr(void)175 leds_intr(void)
176 {
177 static u_char led_countdown, led_stat;
178 u_char i;
179
180 if (led_countdown) {
181 led_countdown--;
182 return;
183 }
184
185 i = led_stat ^ LED0;
186 *ctrl_led = i;
187 led_stat = i;
188 led_countdown = hz;
189 }
190
191