2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2002 by Thomas Moestl <tmm@FreeBSD.org>.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
25 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
33 #include <sys/malloc.h>
34 #include <sys/systm.h>
36 #include <sys/timetc.h>
38 #include <machine/bus.h>
39 #include <machine/bus_common.h>
41 #define COUNTER_MASK ((1 << 29) - 1)
42 #define COUNTER_FREQ 1000000
43 #define COUNTER_QUALITY 100
45 /* Bits in the limit register. */
46 #define CTLR_INTEN (1U << 31) /* Enable timer interrupts */
47 #define CTLR_RELOAD (1U << 30) /* Zero counter on write to limit reg */
48 #define CTLR_PERIODIC (1U << 29) /* Wrap to 0 if limit is reached */
50 /* Offsets of the registers for the two counters. */
54 /* Register offsets from the base address. */
55 #define CTR_COUNT 0x00
56 #define CTR_LIMIT 0x08
59 static timecounter_get_t counter_get_timecount;
62 bus_space_tag_t sc_tag;
63 bus_space_handle_t sc_handle;
69 * This is called from the psycho and sbus drivers. It does not directly
70 * attach to the nexus because it shares register space with the bridge in
74 sparc64_counter_init(const char *name, bus_space_tag_t tag,
75 bus_space_handle_t handle, bus_addr_t offset)
77 struct timecounter *tc;
80 printf("initializing counter-timer\n");
82 * Turn off interrupts from both counters. Set the limit to the
83 * maximum value (although that should not change anything with
84 * CTLR_INTEN and CTLR_PERIODIC off).
86 bus_space_write_8(tag, handle, offset + CTR_CT0 + CTR_LIMIT,
88 bus_space_write_8(tag, handle, offset + CTR_CT1 + CTR_LIMIT,
90 /* Register as a time counter. */
91 tc = malloc(sizeof(*tc), M_DEVBUF, M_WAITOK | M_ZERO);
92 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK);
94 sc->sc_handle = handle;
95 sc->sc_offset = offset + CTR_CT0;
96 tc->tc_get_timecount = counter_get_timecount;
97 tc->tc_counter_mask = COUNTER_MASK;
98 tc->tc_frequency = COUNTER_FREQ;
99 tc->tc_name = strdup(name, M_DEVBUF);
101 tc->tc_quality = COUNTER_QUALITY;
106 counter_get_timecount(struct timecounter *tc)
111 return (bus_space_read_8(sc->sc_tag, sc->sc_handle, sc->sc_offset));