1 /*-
2 * Copyright (c) 2003-2009 RMI Corporation
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of RMI Corporation, nor the names of its contributors,
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * RMI_BSD */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD: stable/9/sys/mips/rmi/dev/iic/ds1374u.c 216410 2010-12-13 17:53:38Z jchandra $");
33 /*
34 * RTC chip sitting on the I2C bus.
35 */
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/kernel.h>
39 #include <sys/module.h>
40 #include <sys/bus.h>
41 #include <sys/clock.h>
42 #include <sys/time.h>
43 #include <sys/resource.h>
44 #include <sys/rman.h>
45
46 #include <mips/include/bus.h>
47 #include <mips/include/cpu.h>
48 #include <mips/include/cpufunc.h>
49 #include <mips/include/frame.h>
50 #include <mips/include/resource.h>
51
52 #include <dev/iicbus/iiconf.h>
53 #include <dev/iicbus/iicbus.h>
54
55 #include "iicbus_if.h"
56 #include "clock_if.h"
57
58 #define DS1374_RTC_COUNTER 0 /* counter (bytes 0-3) */
59
60 struct ds1374u_softc {
61 uint32_t sc_addr;
62 device_t sc_dev;
63 };
64
65 static int
ds1374u_probe(device_t dev)66 ds1374u_probe(device_t dev)
67 {
68 device_set_desc(dev, "DS1374U-33 RTC");
69 return (0);
70 }
71
72 static int
ds1374u_attach(device_t dev)73 ds1374u_attach(device_t dev)
74 {
75 struct ds1374u_softc *sc = device_get_softc(dev);
76
77 if(sc==NULL) {
78 printf("ds1374u_attach device_get_softc failed\n");
79 return (0);
80 }
81 sc->sc_dev = dev;
82 sc->sc_addr = iicbus_get_addr(dev);
83
84 clock_register(dev, 1000);
85 return (0);
86 }
87
88 static int
ds1374u_settime(device_t dev,struct timespec * ts)89 ds1374u_settime(device_t dev, struct timespec *ts)
90 {
91 /* NB: register pointer precedes actual data */
92 uint8_t data[5] = { DS1374_RTC_COUNTER };
93 struct ds1374u_softc *sc = device_get_softc(dev);
94 struct iic_msg msgs[1] = {
95 { sc->sc_addr, IIC_M_WR, 5, data },
96 };
97
98 data[1] = (ts->tv_sec >> 0) & 0xff;
99 data[2] = (ts->tv_sec >> 8) & 0xff;
100 data[3] = (ts->tv_sec >> 16) & 0xff;
101 data[4] = (ts->tv_sec >> 24) & 0xff;
102
103 return iicbus_transfer(dev, msgs, 1);
104 }
105
106 static int
ds1374u_gettime(device_t dev,struct timespec * ts)107 ds1374u_gettime(device_t dev, struct timespec *ts)
108 {
109 struct ds1374u_softc *sc = device_get_softc(dev);
110 uint8_t addr[1] = { DS1374_RTC_COUNTER };
111 uint8_t secs[4];
112 struct iic_msg msgs[2] = {
113 { sc->sc_addr, IIC_M_WR, 1, addr },
114 { sc->sc_addr, IIC_M_RD, 4, secs },
115 };
116 int error;
117
118 error = iicbus_transfer(dev, msgs, 2);
119 if (error == 0) {
120 /* counter has seconds since epoch */
121 ts->tv_sec = (secs[3] << 24) | (secs[2] << 16)
122 | (secs[1] << 8) | (secs[0] << 0);
123 ts->tv_nsec = 0;
124 }
125 return error;
126 }
127
128 static device_method_t ds1374u_methods[] = {
129 DEVMETHOD(device_probe, ds1374u_probe),
130 DEVMETHOD(device_attach, ds1374u_attach),
131
132 DEVMETHOD(clock_gettime, ds1374u_gettime),
133 DEVMETHOD(clock_settime, ds1374u_settime),
134
135 {0, 0},
136 };
137
138 static driver_t ds1374u_driver = {
139 "ds1374u",
140 ds1374u_methods,
141 sizeof(struct ds1374u_softc),
142 };
143 static devclass_t ds1374u_devclass;
144
145 DRIVER_MODULE(ds1374u, iicbus, ds1374u_driver, ds1374u_devclass, 0, 0);
146 MODULE_VERSION(ds1374u, 1);
147 MODULE_DEPEND(ds1374u, iicbus, 1, 1, 1);
148