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