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
42 struct plrtc_softc {
43 struct device sc_dev;
44 bus_space_tag_t sc_iot;
45 bus_space_handle_t sc_ioh;
46 };
47
48 int plrtc_match(struct device *, void *, void *);
49 void plrtc_attach(struct device *, struct device *, void *);
50 int plrtc_gettime(struct todr_chip_handle *, struct timeval *);
51 int plrtc_settime(struct todr_chip_handle *, struct timeval *);
52
53
54 const struct cfattach plrtc_ca = {
55 sizeof(struct plrtc_softc), plrtc_match, plrtc_attach
56 };
57
58 struct cfdriver plrtc_cd = {
59 NULL, "plrtc", DV_DULL
60 };
61
62 int
plrtc_gettime(todr_chip_handle_t handle,struct timeval * tv)63 plrtc_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
76 int
plrtc_settime(todr_chip_handle_t handle,struct timeval * tv)77 plrtc_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
86 int
plrtc_match(struct device * parent,void * match,void * aux)87 plrtc_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
94 void
plrtc_attach(struct device * parent,struct device * self,void * aux)95 plrtc_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 }
129