wdog.c revision 1.8 1 1.8 thorpej /* $NetBSD: wdog.c,v 1.8 2002/09/27 02:24:23 thorpej Exp $ */
2 1.2 msaitoh
3 1.2 msaitoh /*-
4 1.2 msaitoh * Copyright (C) 2000 SAITOH Masanobu. All rights reserved.
5 1.2 msaitoh *
6 1.2 msaitoh * Redistribution and use in source and binary forms, with or without
7 1.2 msaitoh * modification, are permitted provided that the following conditions
8 1.2 msaitoh * are met:
9 1.2 msaitoh * 1. Redistributions of source code must retain the above copyright
10 1.2 msaitoh * notice, this list of conditions and the following disclaimer.
11 1.2 msaitoh * 2. Redistributions in binary form must reproduce the above copyright
12 1.2 msaitoh * notice, this list of conditions and the following disclaimer in the
13 1.2 msaitoh * documentation and/or other materials provided with the distribution.
14 1.2 msaitoh * 3. The name of the author may not be used to endorse or promote products
15 1.2 msaitoh * derived from this software without specific prior written permission.
16 1.2 msaitoh *
17 1.2 msaitoh * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 1.2 msaitoh * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 1.2 msaitoh * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 1.2 msaitoh * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 1.2 msaitoh * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 1.2 msaitoh * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 1.2 msaitoh * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 1.2 msaitoh * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 1.2 msaitoh * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 1.2 msaitoh * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 1.2 msaitoh */
28 1.2 msaitoh
29 1.1 msaitoh #include <sys/param.h>
30 1.1 msaitoh #include <sys/buf.h>
31 1.1 msaitoh #include <sys/systm.h>
32 1.1 msaitoh #include <sys/kernel.h>
33 1.1 msaitoh #include <sys/uio.h>
34 1.1 msaitoh #include <sys/device.h>
35 1.1 msaitoh #include <sys/fcntl.h>
36 1.1 msaitoh #include <sys/ioctl.h>
37 1.1 msaitoh #include <sys/malloc.h>
38 1.1 msaitoh #include <sys/proc.h>
39 1.1 msaitoh #include <sys/syslog.h>
40 1.7 gehenna #include <sys/conf.h>
41 1.1 msaitoh
42 1.1 msaitoh #include <machine/cpu.h>
43 1.6 uch #include <machine/intr.h>
44 1.6 uch
45 1.4 msaitoh #include <sh3/frame.h>
46 1.1 msaitoh #include <sh3/wdtreg.h>
47 1.1 msaitoh #include <sh3/wdogvar.h>
48 1.6 uch #include <sh3/exception.h>
49 1.1 msaitoh
50 1.1 msaitoh struct wdog_softc {
51 1.1 msaitoh struct device sc_dev; /* generic device structures */
52 1.1 msaitoh int flags;
53 1.1 msaitoh };
54 1.1 msaitoh
55 1.5 uch static int wdogmatch(struct device *, struct cfdata *, void *);
56 1.5 uch static void wdogattach(struct device *, struct device *, void *);
57 1.5 uch static int wdogintr(void *);
58 1.1 msaitoh
59 1.1 msaitoh struct cfattach wdog_ca = {
60 1.1 msaitoh sizeof(struct wdog_softc), wdogmatch, wdogattach
61 1.1 msaitoh };
62 1.1 msaitoh
63 1.1 msaitoh extern struct cfdriver wdog_cd;
64 1.7 gehenna
65 1.7 gehenna dev_type_open(wdogopen);
66 1.7 gehenna dev_type_close(wdogclose);
67 1.7 gehenna dev_type_ioctl(wdogioctl);
68 1.7 gehenna
69 1.7 gehenna const struct cdevsw wdog_cdevsw = {
70 1.7 gehenna wdogopen, wdogclose, noread, nowrite, wdogioctl,
71 1.7 gehenna nostop, notty, nopoll, nommap,
72 1.7 gehenna };
73 1.1 msaitoh
74 1.1 msaitoh void
75 1.5 uch wdog_wr_cnt(unsigned char x)
76 1.1 msaitoh {
77 1.1 msaitoh
78 1.1 msaitoh SHREG_WTCNT_W = WTCNT_W_M | (unsigned short) x;
79 1.1 msaitoh }
80 1.1 msaitoh
81 1.1 msaitoh void
82 1.5 uch wdog_wr_csr(unsigned char x)
83 1.1 msaitoh {
84 1.1 msaitoh
85 1.1 msaitoh SHREG_WTCSR_W = WTCSR_W_M | (unsigned short) x;
86 1.1 msaitoh }
87 1.1 msaitoh
88 1.1 msaitoh static int
89 1.5 uch wdogmatch(struct device *parent, struct cfdata *cfp, void *aux)
90 1.1 msaitoh {
91 1.1 msaitoh
92 1.8 thorpej if (strcmp(cfp->cf_name, "wdog"))
93 1.6 uch return (0);
94 1.1 msaitoh
95 1.1 msaitoh return (1);
96 1.1 msaitoh }
97 1.1 msaitoh
98 1.1 msaitoh /*
99 1.1 msaitoh * functions for probeing.
100 1.1 msaitoh */
101 1.1 msaitoh /* ARGSUSED */
102 1.1 msaitoh static void
103 1.5 uch wdogattach(struct device *parent, struct device *self, void *aux)
104 1.1 msaitoh {
105 1.1 msaitoh struct wdog_softc *sc = (struct wdog_softc *)self;
106 1.1 msaitoh
107 1.1 msaitoh sc->flags = 0;
108 1.1 msaitoh
109 1.4 msaitoh wdog_wr_csr(WTCSR_WT | WTCSR_CKS_4096); /* default to wt mode */
110 1.4 msaitoh
111 1.6 uch intc_intr_establish(SH_INTEVT_WDT_ITI, IST_LEVEL, IPL_SOFTCLOCK,
112 1.6 uch wdogintr, 0);
113 1.4 msaitoh
114 1.1 msaitoh printf("\nwdog0: internal watchdog timer\n");
115 1.1 msaitoh }
116 1.1 msaitoh
117 1.1 msaitoh /*ARGSUSED*/
118 1.1 msaitoh int
119 1.5 uch wdogopen(dev_t dev, int flag, int mode, struct proc *p)
120 1.1 msaitoh {
121 1.1 msaitoh struct wdog_softc *sc = wdog_cd.cd_devs[0]; /* XXX */
122 1.1 msaitoh
123 1.1 msaitoh if (minor(dev) != 0)
124 1.1 msaitoh return (ENXIO);
125 1.1 msaitoh if (sc->flags & WDOGF_OPEN)
126 1.1 msaitoh return (EBUSY);
127 1.1 msaitoh sc->flags |= WDOGF_OPEN;
128 1.1 msaitoh return (0);
129 1.1 msaitoh }
130 1.1 msaitoh
131 1.1 msaitoh /*ARGSUSED*/
132 1.1 msaitoh int
133 1.5 uch wdogclose(dev_t dev, int flag, int mode, struct proc *p)
134 1.1 msaitoh {
135 1.1 msaitoh struct wdog_softc *sc = wdog_cd.cd_devs[0]; /* XXX */
136 1.1 msaitoh
137 1.1 msaitoh if (sc->flags & WDOGF_OPEN)
138 1.1 msaitoh sc->flags = 0;
139 1.1 msaitoh
140 1.1 msaitoh return (0);
141 1.1 msaitoh }
142 1.1 msaitoh
143 1.1 msaitoh extern unsigned int maxwdog;
144 1.1 msaitoh
145 1.1 msaitoh /*ARGSUSED*/
146 1.1 msaitoh int
147 1.5 uch wdogioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
148 1.1 msaitoh {
149 1.1 msaitoh int error = 0;
150 1.1 msaitoh int request;
151 1.1 msaitoh
152 1.1 msaitoh switch (cmd) {
153 1.4 msaitoh case SIOWDOGSETMODE:
154 1.4 msaitoh request = *(int *)data;
155 1.4 msaitoh
156 1.4 msaitoh switch (request) {
157 1.4 msaitoh case WDOGM_RESET:
158 1.4 msaitoh wdog_wr_csr(SHREG_WTCSR_R | WTCSR_WT);
159 1.4 msaitoh break;
160 1.4 msaitoh case WDOGM_INTR:
161 1.4 msaitoh wdog_wr_csr(SHREG_WTCSR_R & ~WTCSR_WT);
162 1.4 msaitoh break;
163 1.4 msaitoh default:
164 1.4 msaitoh error = EINVAL;
165 1.4 msaitoh break;
166 1.4 msaitoh }
167 1.4 msaitoh break;
168 1.1 msaitoh case SIORESETWDOG:
169 1.1 msaitoh wdog_wr_cnt(0); /* reset to zero */
170 1.1 msaitoh break;
171 1.1 msaitoh case SIOSTARTWDOG:
172 1.1 msaitoh wdog_wr_csr(WTCSR_WT | WTCSR_CKS_4096);
173 1.1 msaitoh wdog_wr_cnt(0); /* reset to zero */
174 1.1 msaitoh wdog_wr_csr(SHREG_WTCSR_R | WTCSR_TME); /* start!!! */
175 1.1 msaitoh break;
176 1.1 msaitoh case SIOSTOPWDOG:
177 1.1 msaitoh wdog_wr_csr(SHREG_WTCSR_R & ~WTCSR_TME); /* stop */
178 1.1 msaitoh break;
179 1.1 msaitoh case SIOSETWDOG:
180 1.1 msaitoh request = *(int *)data;
181 1.1 msaitoh
182 1.1 msaitoh if (request > 2) {
183 1.1 msaitoh error = EINVAL;
184 1.1 msaitoh break;
185 1.1 msaitoh }
186 1.1 msaitoh break;
187 1.1 msaitoh default:
188 1.1 msaitoh error = EINVAL;
189 1.1 msaitoh break;
190 1.1 msaitoh }
191 1.1 msaitoh
192 1.1 msaitoh return (error);
193 1.4 msaitoh }
194 1.4 msaitoh
195 1.4 msaitoh int
196 1.5 uch wdogintr(void *arg)
197 1.4 msaitoh {
198 1.4 msaitoh struct trapframe *frame = arg;
199 1.4 msaitoh
200 1.4 msaitoh wdog_wr_csr(SHREG_WTCSR_R & ~WTCSR_IOVF); /* clear overflow bit */
201 1.4 msaitoh wdog_wr_cnt(0); /* reset to zero */
202 1.4 msaitoh printf("wdog trapped: spc = %x\n", frame->tf_spc);
203 1.4 msaitoh
204 1.4 msaitoh return (0);
205 1.1 msaitoh }
206