1 /* $NetBSD: pl031.c,v 1.1 2017/06/08 21:00:43 jmcneill Exp $ */
2
3 /*-
4 * Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
15 *
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 BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: pl031.c,v 1.1 2017/06/08 21:00:43 jmcneill Exp $");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/device.h>
35 #include <sys/kmem.h>
36 #include <sys/bus.h>
37
38 #include <dev/clock_subr.h>
39
40 #include <dev/ic/pl031var.h>
41
42 #define RTCDR 0x000
43 #define RTCLR 0x008
44 #define RTCCR 0x00c
45 #define RTCCR_START __BIT(0)
46
47 #define RTC_READ(sc, reg) \
48 bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
49 #define RTC_WRITE(sc, reg, val) \
50 bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
51
52 static int
plrtc_gettime(todr_chip_handle_t tch,struct timeval * tv)53 plrtc_gettime(todr_chip_handle_t tch, struct timeval *tv)
54 {
55 struct plrtc_softc * const sc = tch->cookie;
56
57 tv->tv_sec = RTC_READ(sc, RTCDR);
58 tv->tv_usec = 0;
59
60 return 0;
61 }
62
63 static int
plrtc_settime(todr_chip_handle_t tch,struct timeval * tv)64 plrtc_settime(todr_chip_handle_t tch, struct timeval *tv)
65 {
66 struct plrtc_softc * const sc = tch->cookie;
67
68 RTC_WRITE(sc, RTCLR, tv->tv_sec);
69
70 return 0;
71 }
72
73 void
plrtc_attach(struct plrtc_softc * sc)74 plrtc_attach(struct plrtc_softc *sc)
75 {
76 aprint_naive("\n");
77 aprint_normal(": RTC\n");
78
79 sc->sc_todr.todr_gettime = plrtc_gettime;
80 sc->sc_todr.todr_settime = plrtc_settime;
81 sc->sc_todr.cookie = sc;
82
83 RTC_WRITE(sc, RTCCR, RTCCR_START);
84 }
85