1 /* $NetBSD: sbwdog.c,v 1.15 2017/07/24 09:56:46 mrg Exp $ */
2
3 /*
4 * Copyright (c) 2002 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Jason R. Thorpe and Simon Burge for Wasabi Systems, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed for the NetBSD Project by
20 * Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 * or promote products derived from this software without specific prior
23 * written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 /*
39 * Watchdog timer support for the Broadcom BCM1250 processor.
40 */
41
42 #include <sys/cdefs.h>
43 __KERNEL_RCSID(0, "$NetBSD: sbwdog.c,v 1.15 2017/07/24 09:56:46 mrg Exp $");
44
45 #include "locators.h"
46
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/device.h>
50 #include <sys/wdog.h>
51
52 #include <dev/sysmon/sysmonvar.h>
53
54 #include <mips/locore.h>
55
56 #include <mips/sibyte/include/sb1250_regs.h>
57 #include <mips/sibyte/include/sb1250_scd.h>
58 #include <mips/sibyte/dev/sbscdvar.h>
59
60 #include <evbmips/sbmips/systemsw.h>
61
62 #define SBWDOG_DEFAULT_PERIOD 5 /* Default to 5 seconds. */
63
64 struct sbwdog_softc {
65 device_t sc_dev;
66 struct sysmon_wdog sc_smw;
67 u_long sc_addr;
68 int sc_wdog_armed;
69 int sc_wdog_period;
70 };
71
72 static int sbwdog_match(device_t, cfdata_t, void *);
73 static void sbwdog_attach(device_t, device_t, void *);
74 static int sbwdog_tickle(struct sysmon_wdog *);
75 static int sbwdog_setmode(struct sysmon_wdog *);
76 static void sbwdog_intr(void *, uint32_t, vaddr_t);
77
78 CFATTACH_DECL_NEW(sbwdog, sizeof(struct sbwdog_softc),
79 sbwdog_match, sbwdog_attach, NULL, NULL);
80
81 #define READ_REG(rp) (mips3_ld((register_t)(rp)))
82 #define WRITE_REG(rp, val) (mips3_sd((register_t)(rp), (val)))
83
84 static int
sbwdog_match(device_t parent,cfdata_t cf,void * aux)85 sbwdog_match(device_t parent, cfdata_t cf, void *aux)
86 {
87 struct sbscd_attach_args *sa = aux;
88
89 if (sa->sa_locs.sa_type != SBSCD_DEVTYPE_WDOG)
90 return (0);
91
92 return (1);
93 }
94
95 static void
sbwdog_attach(device_t parent,device_t self,void * aux)96 sbwdog_attach(device_t parent, device_t self, void *aux)
97 {
98 struct sbwdog_softc *sc = device_private(self);
99 struct sbscd_attach_args *sa = aux;
100
101 sc->sc_dev = self;
102 sc->sc_wdog_period = SBWDOG_DEFAULT_PERIOD;
103 sc->sc_addr = MIPS_PHYS_TO_KSEG1(sa->sa_base + sa->sa_locs.sa_offset);
104
105 aprint_normal(": %d second period\n", sc->sc_wdog_period);
106
107 sc->sc_smw.smw_name = device_xname(sc->sc_dev);
108 sc->sc_smw.smw_cookie = sc;
109 sc->sc_smw.smw_setmode = sbwdog_setmode;
110 sc->sc_smw.smw_tickle = sbwdog_tickle;
111 sc->sc_smw.smw_period = sc->sc_wdog_period;
112
113 if (sysmon_wdog_register(&sc->sc_smw) != 0)
114 aprint_error_dev(self, "unable to register with sysmon\n");
115
116 if (sa->sa_locs.sa_intr[0] != SBOBIOCF_INTR_DEFAULT)
117 cpu_intr_establish(sa->sa_locs.sa_intr[0], IPL_HIGH,
118 sbwdog_intr, sc);
119 }
120
121 static int
sbwdog_tickle(struct sysmon_wdog * smw)122 sbwdog_tickle(struct sysmon_wdog *smw)
123 {
124 struct sbwdog_softc *sc = smw->smw_cookie;
125
126 WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, M_SCD_WDOG_ENABLE);
127 return (0);
128 }
129
130 static void
sbwdog_intr(void * v,uint32_t cause,vaddr_t pc)131 sbwdog_intr(void *v, uint32_t cause, vaddr_t pc)
132 {
133 struct sbwdog_softc *sc = v;
134
135 WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, M_SCD_WDOG_ENABLE);
136 WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, 0);
137 WRITE_REG(sc->sc_addr + R_SCD_WDOG_INIT,
138 sc->sc_wdog_period * V_SCD_WDOG_FREQ);
139 WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, M_SCD_WDOG_ENABLE);
140 }
141
142
143 static int
sbwdog_setmode(struct sysmon_wdog * smw)144 sbwdog_setmode(struct sysmon_wdog *smw)
145 {
146 struct sbwdog_softc *sc = smw->smw_cookie;
147
148 if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
149 if (sc->sc_wdog_armed)
150 WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, 0);
151 } else {
152 if (smw->smw_period == WDOG_PERIOD_DEFAULT) {
153 sc->sc_wdog_period = SBWDOG_DEFAULT_PERIOD;
154 smw->smw_period = SBWDOG_DEFAULT_PERIOD; /* XXX needed?? */
155 } else if (smw->smw_period > 8) {
156 /* Maximum of 2^23 usec watchdog period. */
157 return (EINVAL);
158 }
159 sc->sc_wdog_period = smw->smw_period;
160 sc->sc_wdog_armed = 1;
161 WRITE_REG(sc->sc_addr + R_SCD_WDOG_INIT,
162 sc->sc_wdog_period * V_SCD_WDOG_FREQ);
163
164 /* Watchdog is armed by tickling it. */
165 sbwdog_tickle(smw);
166 }
167 return (0);
168 }
169