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1/* $OpenBSD: plrtc.c,v 1.4 2022/10/17 19:09:46 kettenis Exp $ */
2
3/*
4 * Copyright (c) 2015 Jonathan Gray <jsg@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <sys/param.h>
20#include <sys/device.h>
21#include <sys/malloc.h>
22#include <sys/systm.h>
23
24#include <machine/bus.h>
25#include <machine/fdt.h>
26#include <dev/clock_subr.h>
27
28#include <dev/ofw/openfirm.h>
29#include <dev/ofw/fdt.h>
30
31#define RTCDR 0x00
32#define RTCMR 0x04
33#define RTCLR 0x08
34#define RTCCR 0x0c
35#define RTCIMSC 0x10
36#define RTCRIS 0x14
37#define RTCMIS 0x18
38#define RTCICR 0x1c
39
40#define RTCCR_START (1 << 0)
41
42struct plrtc_softc {
43 struct device sc_dev;
44 bus_space_tag_t sc_iot;
45 bus_space_handle_t sc_ioh;
46};
47
48int plrtc_match(struct device *, void *, void *);
49void plrtc_attach(struct device *, struct device *, void *);
50int plrtc_gettime(struct todr_chip_handle *, struct timeval *);
51int plrtc_settime(struct todr_chip_handle *, struct timeval *);
52
53
54const struct cfattach plrtc_ca = {
55 sizeof(struct plrtc_softc), plrtc_match, plrtc_attach
56};
57
58struct cfdriver plrtc_cd = {
59 NULL, "plrtc", DV_DULL
60};
61
62int
63plrtc_gettime(todr_chip_handle_t handle, struct timeval *tv)
64{
65 struct plrtc_softc *sc = handle->cookie;
66 uint32_t tod;
67
68 tod = bus_space_read_4(sc->sc_iot, sc->sc_ioh, RTCDR);
69
70 tv->tv_sec = tod;
71 tv->tv_usec = 0;
72
73 return (0);
74}
75
76int
77plrtc_settime(todr_chip_handle_t handle, struct timeval *tv)
78{
79 struct plrtc_softc *sc = handle->cookie;
80
81 bus_space_write_4(sc->sc_iot, sc->sc_ioh, RTCLR, tv->tv_sec);
82
83 return (0);
84}
85
86int
87plrtc_match(struct device *parent, void *match, void *aux)
88{
89 struct fdt_attach_args *faa = aux;
90
91 return (OF_is_compatible(faa->fa_node, "arm,pl031"));
92}
93
94void
95plrtc_attach(struct device *parent, struct device *self, void *aux)
96{
97 struct fdt_attach_args *faa = aux;
98 struct plrtc_softc *sc = (struct plrtc_softc *) self;
99 todr_chip_handle_t handle;
100
101 if (faa->fa_nreg < 1) {
102 printf(": no register data\n");
103 return;
104 }
105
106 sc->sc_iot = faa->fa_iot;
107 if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
108 faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
109 printf(": failed to map mem space\n");
110 return;
111 }
112
113 handle = malloc(sizeof(struct todr_chip_handle), M_DEVBUF,
114 M_NOWAIT | M_ZERO);
115 if (handle == NULL)
116 panic("couldn't allocate todr_handle");
117
118 handle->cookie = sc;
119 handle->todr_gettime = plrtc_gettime;
120 handle->todr_settime = plrtc_settime;
121 handle->todr_quality = 0;
122 todr_attach(handle);
123
124 /* enable the rtc */
125 bus_space_write_4(sc->sc_iot, sc->sc_ioh, RTCCR, RTCCR_START);
126
127 printf("\n");
128}