1 /* $OpenBSD: pmc.c,v 1.5 2021/10/24 17:05:04 mpi Exp $ */
2
3 /*
4 * Copyright (c) 2007 Mark Kettenis
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 /*
20 * Driver for watchdog device on Blade 1000, Fire 280R, Fire V480 etc.
21 */
22
23 #include <sys/param.h>
24 #include <sys/kernel.h>
25 #include <sys/device.h>
26 #include <sys/malloc.h>
27 #include <sys/systm.h>
28
29 #include <machine/bus.h>
30 #include <machine/autoconf.h>
31
32 #include <sparc64/dev/ebusreg.h>
33 #include <sparc64/dev/ebusvar.h>
34
35 /*
36 * Register access is indirect, through an address and data port.
37 */
38
39 #define PMC_ADDR 0
40 #define PMC_DATA 1
41
42 /* Watchdog time-out register. */
43 #define PMC_WDTO 0x05
44
45 struct pmc_softc {
46 struct device sc_dv;
47 bus_space_tag_t sc_iot;
48 bus_space_handle_t sc_ioh;
49 };
50
51 int pmc_match(struct device *, void *, void *);
52 void pmc_attach(struct device *, struct device *, void *);
53 int pmc_activate(struct device *, int);
54 int pmc_wdog_cb(void *, int);
55
56 const struct cfattach pmc_ca = {
57 sizeof(struct pmc_softc), pmc_match, pmc_attach, NULL, pmc_activate
58 };
59
60 struct cfdriver pmc_cd = {
61 NULL, "pmc", DV_DULL
62 };
63
64 int
pmc_match(struct device * parent,void * cf,void * aux)65 pmc_match(struct device *parent, void *cf, void *aux)
66 {
67 struct ebus_attach_args *ea = aux;
68
69 if (strcmp("pmc", ea->ea_name) == 0)
70 return (1);
71 return (0);
72 }
73
74 void
pmc_attach(struct device * parent,struct device * self,void * aux)75 pmc_attach(struct device *parent, struct device *self, void *aux)
76 {
77 struct pmc_softc *sc = (void *)self;
78 struct ebus_attach_args *ea = aux;
79
80 /* Use prom address if available, otherwise map it. */
81 if (ea->ea_nvaddrs) {
82 if (bus_space_map(ea->ea_memtag, ea->ea_vaddrs[0], 0,
83 BUS_SPACE_MAP_PROMADDRESS, &sc->sc_ioh)) {
84 printf(": can't map PROM register space\n");
85 return;
86 }
87 sc->sc_iot = ea->ea_memtag;
88 } else if (ebus_bus_map(ea->ea_iotag, 0,
89 EBUS_PADDR_FROM_REG(&ea->ea_regs[0]),
90 ea->ea_regs[0].size, 0, 0, &sc->sc_ioh) == 0) {
91 sc->sc_iot = ea->ea_iotag;
92 } else if (ebus_bus_map(ea->ea_memtag, 0,
93 EBUS_PADDR_FROM_REG(&ea->ea_regs[0]),
94 ea->ea_regs[0].size, 0, 0, &sc->sc_ioh) == 0) {
95 sc->sc_iot = ea->ea_memtag;
96 } else {
97 printf(": can't map register space\n");
98 return;
99 }
100
101 printf("\n");
102
103 wdog_register(pmc_wdog_cb, sc);
104 }
105
106 int
pmc_activate(struct device * self,int act)107 pmc_activate(struct device *self, int act)
108 {
109 switch (act) {
110 case DVACT_POWERDOWN:
111 wdog_shutdown(self);
112 break;
113 }
114
115 return (0);
116 }
117
118 int
pmc_wdog_cb(void * arg,int period)119 pmc_wdog_cb(void *arg, int period)
120 {
121 struct pmc_softc *sc = arg;
122 int mins;
123
124 mins = (period + 59) / 60;
125 if (mins > 255)
126 mins = 255;
127
128 bus_space_write_1(sc->sc_iot, sc->sc_ioh, PMC_ADDR, PMC_WDTO);
129 bus_space_write_1(sc->sc_iot, sc->sc_ioh, PMC_DATA, mins);
130
131 return (mins * 60);
132 }
133