1 /*-
2 * Copyright (c) 2015 Luiz Otavio O Souza <[email protected]>
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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/bus.h>
31 #include <sys/clock.h>
32 #include <sys/kernel.h>
33 #include <sys/lock.h>
34 #include <sys/module.h>
35 #include <sys/mutex.h>
36 #include <sys/rman.h>
37
38 #include <machine/bus.h>
39
40 #include <dev/ofw/ofw_bus.h>
41 #include <dev/ofw/ofw_bus_subr.h>
42 #include <arm/ti/ti_sysc.h>
43 #include <arm/ti/am335x/am335x_rtcvar.h>
44 #include <arm/ti/am335x/am335x_rtcreg.h>
45
46 #define RTC_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
47 #define RTC_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
48 #define RTC_LOCK_INIT(_sc) mtx_init(&(_sc)->sc_mtx, \
49 device_get_nameunit(_sc->sc_dev), "am335x_rtc", MTX_DEF)
50 #define RTC_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx)
51
52 #define RTC_READ4(_sc, reg) \
53 bus_read_4((_sc)->sc_mem_res, reg)
54 #define RTC_WRITE4(_sc, reg, value) \
55 bus_write_4((_sc)->sc_mem_res, reg, value)
56
57 #define RTC_MAXIRQS 2
58
59 struct am335x_rtc_softc {
60 device_t sc_dev;
61 struct mtx sc_mtx;
62 struct resource *sc_irq_res[RTC_MAXIRQS];
63 struct resource *sc_mem_res;
64 };
65
66 static struct am335x_rtc_softc *rtc_sc = NULL;
67 static struct resource_spec am335x_rtc_irq_spec[] = {
68 { SYS_RES_IRQ, 0, RF_ACTIVE },
69 { SYS_RES_IRQ, 1, RF_ACTIVE },
70 { -1, 0, 0 }
71 };
72
73 static int
am335x_rtc_probe(device_t dev)74 am335x_rtc_probe(device_t dev)
75 {
76
77 if (!ofw_bus_status_okay(dev))
78 return (ENXIO);
79 if (!ofw_bus_is_compatible(dev, "ti,da830-rtc"))
80 return (ENXIO);
81 device_set_desc(dev, "AM335x RTC (power management mode)");
82
83 return (BUS_PROBE_DEFAULT);
84 }
85
86 static int
am335x_rtc_attach(device_t dev)87 am335x_rtc_attach(device_t dev)
88 {
89 int rid;
90 struct am335x_rtc_softc *sc;
91 uint32_t rev;
92
93 if (rtc_sc != NULL)
94 return (ENXIO);
95 rtc_sc = sc = device_get_softc(dev);
96 sc->sc_dev = dev;
97 rid = 0;
98 sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
99 RF_ACTIVE);
100 if (!sc->sc_mem_res) {
101 device_printf(dev, "cannot allocate memory resources\n");
102 return (ENXIO);
103 }
104 if (bus_alloc_resources(dev, am335x_rtc_irq_spec, sc->sc_irq_res) != 0) {
105 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
106 device_printf(dev, "cannot allocate irq resources\n");
107 return (ENXIO);
108 }
109 RTC_LOCK_INIT(sc);
110
111 /* Enable the RTC module. */
112 ti_sysc_clock_enable(device_get_parent(dev));
113 rev = RTC_READ4(sc, RTC_REVISION);
114 device_printf(dev, "AM335X RTC v%d.%d.%d\n",
115 (rev >> 8) & 0x7, (rev >> 6) & 0x3, rev & 0x3f);
116 /* Unlock the RTC. */
117 RTC_WRITE4(sc, RTC_KICK0R, RTC_KICK0R_PASS);
118 RTC_WRITE4(sc, RTC_KICK1R, RTC_KICK1R_PASS);
119 /* Stop the RTC, we don't need it right now. */
120 RTC_WRITE4(sc, RTC_CTRL, 0);
121 /* Disable interrupts. */
122 RTC_WRITE4(sc, RTC_INTR, 0);
123 /* Ack any pending interrupt. */
124 RTC_WRITE4(sc, RTC_STATUS, RTC_STATUS_ALARM2 | RTC_STATUS_ALARM);
125 /* Enable external clock (xtal) and 32 kHz clock. */
126 RTC_WRITE4(sc, RTC_OSC, RTC_OSC_32KCLK_EN | RTC_OSC_32KCLK_SEL);
127 /* Enable pmic_pwr_enable. */
128 RTC_WRITE4(sc, RTC_PMIC, PMIC_PWR_ENABLE);
129
130 return (0);
131 }
132
133 static int
am335x_rtc_detach(device_t dev)134 am335x_rtc_detach(device_t dev)
135 {
136 struct am335x_rtc_softc *sc;
137
138 sc = device_get_softc(dev);
139 if (sc->sc_irq_res[0] != NULL)
140 bus_release_resources(dev, am335x_rtc_irq_spec, sc->sc_irq_res);
141 if (sc->sc_mem_res)
142 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
143 RTC_LOCK_DESTROY(sc);
144
145 return (0);
146 }
147
148 void
am335x_rtc_pmic_pwr_toggle(void)149 am335x_rtc_pmic_pwr_toggle(void)
150 {
151 int timeout;
152 struct clocktime ct;
153 struct timespec ts;
154
155 /*
156 * We stop the RTC so we don't need to check the STATUS.BUSY bit
157 * before update ALARM2 registers.
158 */
159 timeout = 10;
160 RTC_WRITE4(rtc_sc, RTC_CTRL, 0);
161 while (--timeout && RTC_READ4(rtc_sc, RTC_STATUS) & RTC_STATUS_RUN)
162 DELAY(100);
163 if (timeout == 0) {
164 device_printf(rtc_sc->sc_dev, "RTC does not stop.\n");
165 return;
166 }
167 /* Program the ALARM2 to fire in 2 seconds. */
168 ct.dow = 0;
169 ct.nsec = 0;
170 ct.sec = FROMBCD(RTC_READ4(rtc_sc, RTC_SECONDS) & 0x7f);
171 ct.min = FROMBCD(RTC_READ4(rtc_sc, RTC_MINUTES) & 0x7f);
172 ct.hour = FROMBCD(RTC_READ4(rtc_sc, RTC_HOURS) & 0x3f);
173 ct.day = FROMBCD(RTC_READ4(rtc_sc, RTC_DAYS) & 0x3f);
174 ct.mon = FROMBCD(RTC_READ4(rtc_sc, RTC_MONTHS) & 0x1f);
175 ct.year = FROMBCD(RTC_READ4(rtc_sc, RTC_YEARS) & 0xff);
176 ct.year += POSIX_BASE_YEAR;
177 clock_ct_to_ts(&ct, &ts);
178 ts.tv_sec += 2;
179 clock_ts_to_ct(&ts, &ct);
180 RTC_WRITE4(rtc_sc, RTC_ALARM2_SECONDS, TOBCD(ct.sec));
181 RTC_WRITE4(rtc_sc, RTC_ALARM2_MINUTES, TOBCD(ct.min));
182 RTC_WRITE4(rtc_sc, RTC_ALARM2_HOURS, TOBCD(ct.hour));
183 RTC_WRITE4(rtc_sc, RTC_ALARM2_DAYS, TOBCD(ct.day));
184 RTC_WRITE4(rtc_sc, RTC_ALARM2_MONTHS, TOBCD(ct.mon));
185 RTC_WRITE4(rtc_sc, RTC_ALARM2_YEARS, TOBCD(ct.year - POSIX_BASE_YEAR));
186 /* Enable ALARM2 interrupt. */
187 RTC_WRITE4(rtc_sc, RTC_INTR, RTC_INTR_ALARM2);
188 /* Start count. */
189 RTC_WRITE4(rtc_sc, RTC_CTRL, RTC_CTRL_RUN);
190 }
191
192 static device_method_t am335x_rtc_methods[] = {
193 DEVMETHOD(device_probe, am335x_rtc_probe),
194 DEVMETHOD(device_attach, am335x_rtc_attach),
195 DEVMETHOD(device_detach, am335x_rtc_detach),
196
197 DEVMETHOD_END
198 };
199
200 static driver_t am335x_rtc_driver = {
201 "am335x_rtc",
202 am335x_rtc_methods,
203 sizeof(struct am335x_rtc_softc),
204 };
205
206 DRIVER_MODULE(am335x_rtc, simplebus, am335x_rtc_driver, 0, 0);
207 MODULE_VERSION(am335x_rtc, 1);
208 MODULE_DEPEND(am335x_rtc, simplebus, 1, 1, 1);
209 MODULE_DEPEND(am335x_rtc, ti_sysc, 1, 1, 1);
210