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1 /*-
2  * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@freebsd.org>
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 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/watchdog.h>
32 #include <sys/bus.h>
33 #include <sys/kernel.h>
34 #include <sys/lock.h>
35 #include <sys/module.h>
36 #include <sys/mutex.h>
37 #include <sys/rman.h>
38
39 #include <dev/fdt/fdt_common.h>
40 #include <dev/ofw/openfirm.h>
41 #include <dev/ofw/ofw_bus.h>
42 #include <dev/ofw/ofw_bus_subr.h>
43
44 #include <machine/bus.h>
45 #include <machine/cpufunc.h>
46 #include <machine/machdep.h>
47 #include <machine/fdt.h>
48
49 #include <arm/rockchip/rk30xx_wdog.h>
50
51 #ifndef RK30_WDT_BASE
52 #define RK30_WDT_BASE           0x2004c000
53 #define RK30_WDT_PSIZE          0x100
54 #endif
55
56 #define RK30_WDT_READ(_sc, _r)          bus_read_4((_sc)->res, (_r))
57 #define RK30_WDT_WRITE(_sc, _r, _v)     bus_write_4((_sc)->res, (_r), (_v))
58
59 #define WDOG_CTRL               0x00
60 #define WDOG_CTRL_EN            (1 << 0)
61 #define WDOG_CTRL_RSP_MODE      (1 << 1)
62 #define WDOG_CTRL_RST_PULSE     (4 << 2)
63 #define WDOG_CTRL_RST           0xa
64 #define WDOG_TORR               0x04
65 #define WDOG_TORR_INTVL_SHIFT   0
66 #define WDOG_CCVR               0x08
67 #define WDOG_CRR                0x0c
68 #define WDOG_CRR_PWD            0x76
69 #define WDOG_STAT               0x10
70 #define WDOG_EOI                0x14
71
72 static struct rk30_wd_softc *rk30_wd_sc = NULL;
73
74 struct rk30_wd_softc {
75         device_t                dev;
76         struct resource         *res;
77         struct mtx              mtx;
78         int                     freq;
79 };
80
81 static void rk30_wd_watchdog_fn(void *private, u_int cmd, int *error);
82
83 static int
84 rk30_wd_probe(device_t dev)
85 {
86
87         if (!ofw_bus_status_okay(dev))
88                 return (ENXIO);
89
90         if (ofw_bus_is_compatible(dev, "rockchip,rk30xx-wdt")) {
91                 device_set_desc(dev, "Rockchip RK30XX Watchdog");
92                 return (BUS_PROBE_DEFAULT);
93         }
94
95         return (ENXIO);
96 }
97
98 static int
99 rk30_wd_attach(device_t dev)
100 {
101         struct rk30_wd_softc *sc;
102         int rid;
103         phandle_t node;
104         pcell_t cell;
105
106         if (rk30_wd_sc != NULL)
107                 return (ENXIO);
108
109         sc = device_get_softc(dev);
110         sc->dev = dev;
111
112         node = ofw_bus_get_node(sc->dev);
113         if (OF_getencprop(node, "clock-frequency", &cell, sizeof(cell)) > 0)
114                 sc->freq = cell / 1000000;
115         else
116                 return (ENXIO);
117
118         rid = 0;
119         sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
120         if (sc->res == NULL) {
121                 device_printf(dev, "could not allocate memory resource\n");
122                 return (ENXIO);
123         }
124
125         rk30_wd_sc = sc;
126         mtx_init(&sc->mtx, "RK30XX Watchdog", "rk30_wd", MTX_DEF);
127         EVENTHANDLER_REGISTER(watchdog_list, rk30_wd_watchdog_fn, sc, 0);
128
129         return (0);
130 }
131
132 static void
133 rk30_wd_watchdog_fn(void *private, u_int cmd, int *error)
134 {
135         struct rk30_wd_softc *sc;
136         uint64_t ms, m, max;
137         int i;
138
139         sc = private;
140         mtx_lock(&sc->mtx);
141
142         cmd &= WD_INTERVAL;
143
144         if (cmd > 0) {
145                 ms = ((uint64_t)1 << (cmd & WD_INTERVAL)) / 1000000;
146                 m = 0xffff / sc->freq;
147                 max = 0x7fffffff / sc->freq + 1;
148                 i = 0;
149                 while (m < max && m < ms) {
150                         m <<= 1;
151                         i++;
152                 }
153                 if (m < max) {
154                         RK30_WDT_WRITE(sc, WDOG_TORR,
155                             i << WDOG_TORR_INTVL_SHIFT);
156                         RK30_WDT_WRITE(sc, WDOG_CTRL,
157                             WDOG_CTRL_EN | WDOG_CTRL_RSP_MODE |
158                             WDOG_CTRL_RST_PULSE);
159                         RK30_WDT_WRITE(sc, WDOG_CRR, WDOG_CRR_PWD);
160                         *error = 0;
161                 } else {
162                         device_printf(sc->dev, "Can not be disabled\n");
163                         mtx_unlock(&sc->mtx);
164                         RK30_WDT_WRITE(sc, WDOG_CTRL, WDOG_CTRL_RST);
165                         return;
166                 }
167         }
168         else
169                 RK30_WDT_WRITE(sc, WDOG_CTRL, WDOG_CTRL_RST);
170
171         mtx_unlock(&sc->mtx);
172 }
173
174 void
175 rk30_wd_watchdog_reset()
176 {
177         bus_space_handle_t bsh;
178
179         bus_space_map(fdtbus_bs_tag, RK30_WDT_BASE, RK30_WDT_PSIZE, 0, &bsh);
180         bus_space_write_4(fdtbus_bs_tag, bsh, WDOG_TORR, 0);
181         bus_space_write_4(fdtbus_bs_tag, bsh, WDOG_CTRL,
182             WDOG_CTRL_EN | WDOG_CTRL_RSP_MODE | WDOG_CTRL_RST_PULSE);
183
184         while (1);
185 }
186
187 static device_method_t rk30_wd_methods[] = {
188         DEVMETHOD(device_probe, rk30_wd_probe),
189         DEVMETHOD(device_attach, rk30_wd_attach),
190
191         DEVMETHOD_END
192 };
193
194 static driver_t rk30_wd_driver = {
195         "rk30_wd",
196         rk30_wd_methods,
197         sizeof(struct rk30_wd_softc),
198 };
199 static devclass_t rk30_wd_devclass;
200
201 DRIVER_MODULE(rk30_wd, simplebus, rk30_wd_driver, rk30_wd_devclass, 0, 0);