1 /* $OpenBSD: mvdog.c,v 1.2 2021/10/24 17:52:26 mpi Exp $ */
2 /*
3 * Copyright (c) 2019 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 #include <machine/bus.h>
22 #include <machine/fdt.h>
23
24 #include <dev/ofw/openfirm.h>
25 #include <dev/ofw/ofw_misc.h>
26 #include <dev/ofw/fdt.h>
27
28 #define CNTR_RETRIGGER 0
29 #define CNTR_WDOG 1
30
31 #define CNTR_CTRL(x) ((x) * 0x10)
32 #define CNTR_CTRL_ENABLE (1 << 0)
33
34 #define WDT_TIMER_SELECT 0x64
35
36 #define HREAD4(sc, reg) \
37 (bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)))
38 #define HWRITE4(sc, reg, val) \
39 bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
40 #define HSET4(sc, reg, bits) \
41 HWRITE4((sc), (reg), HREAD4((sc), (reg)) | (bits))
42 #define HCLR4(sc, reg, bits) \
43 HWRITE4((sc), (reg), HREAD4((sc), (reg)) & ~(bits))
44
45 struct mvdog_softc {
46 struct device sc_dev;
47 bus_space_tag_t sc_iot;
48 bus_space_handle_t sc_ioh;
49 struct regmap *sc_rm;
50 };
51
52 int mvdog_match(struct device *, void *, void *);
53 void mvdog_attach(struct device *, struct device *, void *);
54
55 const struct cfattach mvdog_ca = {
56 sizeof (struct mvdog_softc), mvdog_match, mvdog_attach
57 };
58
59 struct cfdriver mvdog_cd = {
60 NULL, "mvdog", DV_DULL
61 };
62
63 int
mvdog_match(struct device * parent,void * cfdata,void * aux)64 mvdog_match(struct device *parent, void *cfdata, void *aux)
65 {
66 struct fdt_attach_args *faa = aux;
67
68 return OF_is_compatible(faa->fa_node, "marvell,armada-3700-wdt");
69 }
70
71 void
mvdog_attach(struct device * parent,struct device * self,void * aux)72 mvdog_attach(struct device *parent, struct device *self, void *aux)
73 {
74 struct mvdog_softc *sc = (struct mvdog_softc *)self;
75 struct fdt_attach_args *faa = aux;
76
77 if (faa->fa_nreg < 1) {
78 printf(": no registers\n");
79 return;
80 }
81
82 sc->sc_iot = faa->fa_iot;
83 if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
84 faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
85 printf(": can't map registers\n");
86 return;
87 }
88
89 sc->sc_rm = regmap_byphandle(OF_getpropint(faa->fa_node,
90 "marvell,system-controller", 0));
91 if (sc->sc_rm == NULL) {
92 printf(": can't get regmap\n");
93 return;
94 }
95
96 printf("\n");
97
98 /* Disable watchdog timer. */
99 HCLR4(sc, CNTR_CTRL(CNTR_WDOG), CNTR_CTRL_ENABLE);
100 HCLR4(sc, CNTR_CTRL(CNTR_RETRIGGER), CNTR_CTRL_ENABLE);
101 regmap_write_4(sc->sc_rm, WDT_TIMER_SELECT, 0);
102 }
103