1 /* $NetBSD: nvram.c,v 1.20 2014/07/25 08:10:34 dholland Exp $ */
2
3 /*-
4 * Copyright (C) 1998 Internet Research Institute, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by
18 * Internet Research Institute, Inc.
19 * 4. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include <sys/cdefs.h>
35 __KERNEL_RCSID(0, "$NetBSD: nvram.c,v 1.20 2014/07/25 08:10:34 dholland Exp $");
36
37 #include <sys/types.h>
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/conf.h>
41 #include <sys/kernel.h>
42 #include <sys/device.h>
43 #include <sys/malloc.h>
44 #include <sys/event.h>
45
46 #include <machine/autoconf.h>
47 #include <machine/pio.h>
48
49 #define NVRAM_NONE 0
50 #define NVRAM_IOMEM 1
51 #define NVRAM_PORT 2
52
53 #define NVRAM_SIZE 0x2000
54
55 static void nvram_attach(device_t, device_t, void *);
56 static int nvram_match(device_t, cfdata_t, void *);
57
58 struct nvram_softc {
59 int nv_type;
60 char *nv_port;
61 char *nv_data;
62 };
63
64 CFATTACH_DECL_NEW(nvram, sizeof(struct nvram_softc),
65 nvram_match, nvram_attach, NULL, NULL);
66
67 extern struct cfdriver nvram_cd;
68
69 dev_type_read(nvramread);
70 dev_type_write(nvramwrite);
71 dev_type_mmap(nvrammmap);
72
73 const struct cdevsw nvram_cdevsw = {
74 .d_open = nullopen,
75 .d_close = nullclose,
76 .d_read = nvramread,
77 .d_write = nvramwrite,
78 .d_ioctl = noioctl,
79 .d_stop = nostop,
80 .d_tty = notty,
81 .d_poll = nopoll,
82 .d_mmap = nvrammmap,
83 .d_kqfilter = nokqfilter,
84 .d_discard = nodiscard,
85 .d_flag = 0
86 };
87
88 int
nvram_match(device_t parent,cfdata_t cf,void * aux)89 nvram_match(device_t parent, cfdata_t cf, void *aux)
90 {
91 struct confargs *ca = aux;
92
93 if (strcmp(ca->ca_name, "nvram") != 0)
94 return 0;
95
96 if (ca->ca_nreg == 0)
97 return 0;
98
99 return 1;
100 }
101
102 void
nvram_attach(device_t parent,device_t self,void * aux)103 nvram_attach(device_t parent, device_t self, void *aux)
104 {
105 struct nvram_softc *sc = device_private(self);
106 struct confargs *ca = aux;
107 int *reg = ca->ca_reg;
108
109 printf("\n");
110
111 switch (ca->ca_nreg) {
112
113 case 8: /* untested */
114 sc->nv_type = NVRAM_IOMEM;
115 sc->nv_data = mapiodev(ca->ca_baseaddr + reg[0], reg[1], false);
116 break;
117
118 case 16:
119 sc->nv_type = NVRAM_PORT;
120 sc->nv_port = mapiodev(ca->ca_baseaddr + reg[0], reg[1], false);
121 sc->nv_data = mapiodev(ca->ca_baseaddr + reg[2], reg[3], false);
122 break;
123
124 case 0:
125 default:
126 sc->nv_type = NVRAM_NONE;
127 return;
128 }
129 }
130
131 int
nvramread(dev_t dev,struct uio * uio,int flag)132 nvramread(dev_t dev, struct uio *uio, int flag)
133 {
134 struct nvram_softc *sc;
135 u_int off, cnt;
136 int i;
137 int error = 0;
138 char *buf;
139
140 sc = device_lookup_private(&nvram_cd, 0);
141
142 off = uio->uio_offset;
143 cnt = uio->uio_resid;
144
145 if (off > NVRAM_SIZE || cnt > NVRAM_SIZE)
146 return EFAULT;
147
148 if (off + cnt > NVRAM_SIZE)
149 cnt = NVRAM_SIZE - off;
150
151 buf = malloc(NVRAM_SIZE, M_DEVBUF, M_WAITOK);
152 if (buf == NULL) {
153 error = EAGAIN;
154 goto out;
155 }
156
157 switch (sc->nv_type) {
158
159 case NVRAM_IOMEM:
160 for (i = 0; i < NVRAM_SIZE; i++)
161 buf[i] = sc->nv_data[i * 16];
162
163 break;
164
165 case NVRAM_PORT:
166 for (i = 0; i < NVRAM_SIZE; i += 32) {
167 int j;
168
169 out8(sc->nv_port, i / 32);
170 for (j = 0; j < 32; j++) {
171 buf[i + j] = sc->nv_data[j * 16];
172 }
173 }
174 break;
175
176 default:
177 goto out;
178 }
179
180 error = uiomove(buf + off, cnt, uio);
181
182 out:
183 if (buf)
184 free(buf, M_DEVBUF);
185
186 return error;
187 }
188
189 int
nvramwrite(dev_t dev,struct uio * uio,int flag)190 nvramwrite(dev_t dev, struct uio *uio, int flag)
191 {
192 return ENXIO;
193 }
194
195 paddr_t
nvrammmap(dev_t dev,off_t off,int prot)196 nvrammmap(dev_t dev, off_t off, int prot)
197 {
198 return -1;
199 }
200