1 /* $OpenBSD: exrtc.c,v 1.5 2022/10/17 19:09:46 kettenis Exp $ */
2 /*
3 * Copyright (c) 2017 Mark Kettenis <kettenis@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #include <sys/param.h>
19 #include <sys/systm.h>
20 #include <sys/device.h>
21 #include <sys/time.h>
22
23 #include <machine/bus.h>
24 #include <machine/fdt.h>
25
26 #include <dev/ofw/openfirm.h>
27 #include <dev/ofw/fdt.h>
28
29 #include <dev/clock_subr.h>
30
31 #define RTCCTRL 0x40
32 #define RTCCTRL_RTCEN (1 << 0)
33
34 #define RTCSEC 0x70
35 #define RTCMIN 0x74
36 #define RTCHOUR 0x78
37 #define RTCDAY 0x7c
38 #define RTCMON 0x84
39 #define RTCYEAR 0x88
40
41 #define HREAD4(sc, reg) \
42 (bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)))
43 #define HWRITE4(sc, reg, val) \
44 bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
45
46 struct exrtc_softc {
47 struct device sc_dev;
48 bus_space_tag_t sc_iot;
49 bus_space_handle_t sc_ioh;
50 struct todr_chip_handle sc_todr;
51 };
52
53 int exrtc_match(struct device *, void *, void *);
54 void exrtc_attach(struct device *, struct device *, void *);
55
56 const struct cfattach exrtc_ca = {
57 sizeof(struct exrtc_softc), exrtc_match, exrtc_attach
58 };
59
60 struct cfdriver exrtc_cd = {
61 NULL, "exrtc", DV_DULL
62 };
63
64 int exrtc_gettime(todr_chip_handle_t, struct timeval *);
65 int exrtc_settime(todr_chip_handle_t, struct timeval *);
66
67 int
exrtc_match(struct device * parent,void * match,void * aux)68 exrtc_match(struct device *parent, void *match, void *aux)
69 {
70 struct fdt_attach_args *faa = aux;
71
72 return OF_is_compatible(faa->fa_node, "samsung,s3c6410-rtc");
73 }
74
75 void
exrtc_attach(struct device * parent,struct device * self,void * aux)76 exrtc_attach(struct device *parent, struct device *self, void *aux)
77 {
78 struct exrtc_softc *sc = (struct exrtc_softc *)self;
79 struct fdt_attach_args *faa = aux;
80
81 sc->sc_iot = faa->fa_iot;
82
83 if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
84 faa->fa_reg[0].size, 0, &sc->sc_ioh))
85 panic("%s: bus_space_map failed!", __func__);
86
87 printf("\n");
88
89 sc->sc_todr.cookie = sc;
90 sc->sc_todr.todr_gettime = exrtc_gettime;
91 sc->sc_todr.todr_settime = exrtc_settime;
92 sc->sc_todr.todr_quality = 0;
93 todr_attach(&sc->sc_todr);
94 }
95
96 int
exrtc_gettime(todr_chip_handle_t handle,struct timeval * tv)97 exrtc_gettime(todr_chip_handle_t handle, struct timeval *tv)
98 {
99 struct exrtc_softc *sc = handle->cookie;
100 struct clock_ymdhms dt;
101 int retried = 0;
102
103 retry:
104 dt.dt_sec = FROMBCD(HREAD4(sc, RTCSEC));
105 dt.dt_min = FROMBCD(HREAD4(sc, RTCMIN));
106 dt.dt_hour = FROMBCD(HREAD4(sc, RTCHOUR));
107 dt.dt_day = FROMBCD(HREAD4(sc, RTCDAY));
108 dt.dt_mon = FROMBCD(HREAD4(sc, RTCMON));
109 dt.dt_year = FROMBCD(HREAD4(sc, RTCYEAR)) + 1900;
110
111 /* If the second counter rolled over, retry. */
112 if (dt.dt_sec > FROMBCD(HREAD4(sc, RTCSEC)) && !retried) {
113 retried = 1;
114 goto retry;
115 }
116
117 if (dt.dt_sec > 59 || dt.dt_min > 59 || dt.dt_hour > 23 ||
118 dt.dt_day > 31 || dt.dt_day == 0 ||
119 dt.dt_mon > 12 || dt.dt_mon == 0 ||
120 dt.dt_year < POSIX_BASE_YEAR)
121 return 1;
122
123 tv->tv_sec = clock_ymdhms_to_secs(&dt);
124 tv->tv_usec = 0;
125 return 0;
126 }
127
128 int
exrtc_settime(todr_chip_handle_t handle,struct timeval * tv)129 exrtc_settime(todr_chip_handle_t handle, struct timeval *tv)
130 {
131 struct exrtc_softc *sc = handle->cookie;
132 struct clock_ymdhms dt;
133 uint32_t val;
134
135 clock_secs_to_ymdhms(tv->tv_sec, &dt);
136
137 HWRITE4(sc, RTCSEC, TOBCD(dt.dt_sec));
138 HWRITE4(sc, RTCMIN, TOBCD(dt.dt_min));
139 HWRITE4(sc, RTCHOUR, TOBCD(dt.dt_hour));
140 HWRITE4(sc, RTCDAY, TOBCD(dt.dt_day));
141 HWRITE4(sc, RTCMON, TOBCD(dt.dt_mon));
142 HWRITE4(sc, RTCYEAR, TOBCD(dt.dt_year - 1900));
143
144 val = HREAD4(sc, RTCCTRL);
145 HWRITE4(sc, RTCCTRL, val | RTCCTRL_RTCEN);
146
147 return 0;
148 }
149