1 /* $OpenBSD: qcrtc.c,v 1.4 2024/05/13 01:15:50 jsg Exp $ */
2 /*
3 * Copyright (c) 2022 Patrick Wildt <patrick@blueri.se>
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
22 #include <machine/bus.h>
23 #include <machine/fdt.h>
24
25 #include <dev/fdt/spmivar.h>
26
27 #include <dev/ofw/openfirm.h>
28 #include <dev/ofw/ofw_misc.h>
29 #include <dev/ofw/fdt.h>
30
31 #include <dev/clock_subr.h>
32
33 /* Registers. */
34 #define RTC_WRITE 0x40
35 #define RTC_CTRL 0x46
36 #define RTC_CTRL_EN (1U << 7)
37 #define RTC_READ 0x48
38
39 struct qcrtc_softc {
40 struct device sc_dev;
41 int sc_node;
42 spmi_tag_t sc_tag;
43 int8_t sc_sid;
44 uint16_t sc_addr;
45
46 struct todr_chip_handle sc_todr;
47 };
48
49 int qcrtc_match(struct device *, void *, void *);
50 void qcrtc_attach(struct device *, struct device *, void *);
51
52 const struct cfattach qcrtc_ca = {
53 sizeof (struct qcrtc_softc), qcrtc_match, qcrtc_attach
54 };
55
56 struct cfdriver qcrtc_cd = {
57 NULL, "qcrtc", DV_DULL
58 };
59
60 int qcrtc_gettime(struct todr_chip_handle *, struct timeval *);
61 int qcrtc_settime(struct todr_chip_handle *, struct timeval *);
62
63 extern int qcscm_uefi_rtc_get(uint32_t *);
64 extern int qcscm_uefi_rtc_set(uint32_t);
65
66 int
qcrtc_match(struct device * parent,void * match,void * aux)67 qcrtc_match(struct device *parent, void *match, void *aux)
68 {
69 struct spmi_attach_args *saa = aux;
70
71 return OF_is_compatible(saa->sa_node, "qcom,pmk8350-rtc");
72 }
73
74 void
qcrtc_attach(struct device * parent,struct device * self,void * aux)75 qcrtc_attach(struct device *parent, struct device *self, void *aux)
76 {
77 struct qcrtc_softc *sc = (struct qcrtc_softc *)self;
78 struct spmi_attach_args *saa = aux;
79 uint32_t reg[2];
80
81 if (OF_getpropintarray(saa->sa_node, "reg",
82 reg, sizeof(reg)) != sizeof(reg)) {
83 printf(": can't find registers\n");
84 return;
85 }
86
87 sc->sc_node = saa->sa_node;
88 sc->sc_tag = saa->sa_tag;
89 sc->sc_sid = saa->sa_sid;
90 sc->sc_addr = reg[0];
91
92 printf("\n");
93
94 sc->sc_todr.cookie = sc;
95 sc->sc_todr.todr_gettime = qcrtc_gettime;
96 sc->sc_todr.todr_settime = qcrtc_settime;
97 sc->sc_todr.todr_quality = 0;
98 todr_attach(&sc->sc_todr);
99 }
100
101 int
qcrtc_gettime(struct todr_chip_handle * handle,struct timeval * tv)102 qcrtc_gettime(struct todr_chip_handle *handle, struct timeval *tv)
103 {
104 struct qcrtc_softc *sc = handle->cookie;
105 uint32_t reg, off;
106 int error;
107
108 /* Read current counting RTC value. */
109 error = spmi_cmd_read(sc->sc_tag, sc->sc_sid, SPMI_CMD_EXT_READL,
110 sc->sc_addr + RTC_READ, ®, sizeof(reg));
111 if (error) {
112 printf("%s: error reading RTC\n", sc->sc_dev.dv_xname);
113 return error;
114 }
115
116 /* Retrieve RTC offset from either NVRAM or UEFI. */
117 error = nvmem_read_cell(sc->sc_node, "offset", &off, sizeof(off));
118 if (error == ENXIO || (!error && off == 0))
119 error = qcscm_uefi_rtc_get(&off);
120 if (error)
121 return error;
122
123 tv->tv_sec = off + reg;
124 tv->tv_usec = 0;
125 return 0;
126 }
127
128 int
qcrtc_settime(struct todr_chip_handle * handle,struct timeval * tv)129 qcrtc_settime(struct todr_chip_handle *handle, struct timeval *tv)
130 {
131 struct qcrtc_softc *sc = handle->cookie;
132 uint32_t reg, off;
133 int error;
134
135 error = spmi_cmd_read(sc->sc_tag, sc->sc_sid, SPMI_CMD_EXT_READL,
136 sc->sc_addr + RTC_READ, ®, sizeof(reg));
137 if (error) {
138 printf("%s: error reading RTC\n", sc->sc_dev.dv_xname);
139 return error;
140 }
141
142 /* Store RTC offset in either NVRAM or UEFI. */
143 off = tv->tv_sec - reg;
144 error = nvmem_write_cell(sc->sc_node, "offset", &off, sizeof(off));
145 if (error == ENXIO)
146 error = qcscm_uefi_rtc_set(off);
147
148 return error;
149 }
150