1 /* $NetBSD: dev_tape.c,v 1.13 2014/03/30 15:20:54 christos Exp $ */
2
3 /*-
4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Paul Kranenburg.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * This module implements a "raw device" interface suitable for
34 * use by the stand-alone I/O library UFS file-system code, and
35 * possibly for direct access (i.e. boot from tape).
36 */
37
38 #include <sys/types.h>
39 #include <machine/prom.h>
40
41 #include <lib/libkern/libkern.h>
42
43 #include <lib/libsa/stand.h>
44 #include "libsa.h"
45 #include "dev_tape.h"
46
47 extern int debug;
48
49 struct mvmeprom_dskio tape_ioreq;
50
51 static int hackprom_diskrd(struct mvmeprom_dskio *);
52
53 /*
54 * This is a special version of devopen() for tape boot.
55 * In this version, the file name is a numeric string of
56 * one digit, which is passed to the device open so it
57 * can open the appropriate tape segment.
58 */
59 int
devopen(struct open_file * f,const char * fname,char ** file)60 devopen(struct open_file *f, const char *fname, char **file)
61 {
62 struct devsw *dp;
63
64 *file = (char *)fname;
65 dp = &devsw[0];
66 f->f_dev = dp;
67
68 /* The following will call tape_open() */
69 return dp->dv_open(f, fname);
70 }
71
72 int
tape_open(struct open_file * f,...)73 tape_open(struct open_file *f, ...)
74 {
75 char *fname; /* partition number, i.e. "1" */
76 int part;
77 struct mvmeprom_dskio *ti;
78 va_list ap;
79
80 va_start(ap, f);
81 fname = va_arg(ap, char *);
82 va_end(ap);
83
84 /*
85 * Set the tape segment number to the one indicated
86 * by the single digit fname passed in above.
87 */
88 if ((fname[0] < '0') && (fname[0] > '9')) {
89 return ENOENT;
90 }
91 part = fname[0] - '0';
92
93 /*
94 * Setup our part of the saioreq.
95 * (determines what gets opened)
96 */
97 ti = &tape_ioreq;
98 memset((void *)ti, 0, sizeof(*ti));
99
100 ti->ctrl_lun = bugargs.ctrl_lun;
101 ti->dev_lun = bugargs.dev_lun;
102 ti->status = 0;
103 ti->pbuffer = NULL;
104 ti->blk_num = part;
105 ti->blk_cnt = 0;
106 ti->flag = 0;
107 ti->addr_mod = 0;
108
109 f->f_devdata = ti;
110
111 return 0;
112 }
113
114 int
tape_close(struct open_file * f)115 tape_close(struct open_file *f)
116 {
117 f->f_devdata = NULL;
118 return 0;
119 }
120
121 #define MVMEPROM_SCALE (512/MVMEPROM_BLOCK_SIZE)
122
123 int
tape_strategy(void * devdata,int flag,daddr_t dblk,u_int size,void * buf,u_int * rsize)124 tape_strategy(void *devdata, int flag, daddr_t dblk, u_int size, void *buf,
125 u_int *rsize)
126 {
127 struct mvmeprom_dskio *ti;
128 int ret;
129
130 ti = devdata;
131
132 if (flag != F_READ)
133 return EROFS;
134
135 ti->status = 0;
136 ti->pbuffer = buf;
137 /* don't change block #, set in open */
138 ti->blk_cnt = size / (512 / MVMEPROM_SCALE);
139
140 /* work around for stupid '147 prom bug */
141 if (bugargs.cputyp == 0x147)
142 ret = hackprom_diskrd(ti);
143 else
144 ret = mvmeprom_diskrd(ti);
145
146 if (ret != 0)
147 return EIO;
148
149 *rsize = (ti->blk_cnt / MVMEPROM_SCALE) * 512;
150 ti->flag |= IGNORE_FILENUM; /* ignore next time */
151
152 return 0;
153 }
154
155 int
tape_ioctl(struct open_file * f,u_long cmd,void * data)156 tape_ioctl(struct open_file *f, u_long cmd, void *data)
157 {
158
159 return EIO;
160 }
161
162 static int
hackprom_diskrd(struct mvmeprom_dskio * ti)163 hackprom_diskrd(struct mvmeprom_dskio *ti)
164 {
165 static int blkoffset = 0;
166
167 #define hackload_addr ((char *)0x080000) /* Load tape segment here */
168 #define hackload_blocks 0x3000 /* 3Mb worth */
169
170 if ((ti->flag & IGNORE_FILENUM) == 0) {
171 /*
172 * First time through. Load the whole tape segment...
173 */
174 struct mvmeprom_dskio nti;
175 int ret;
176
177 nti = *ti;
178
179 nti.pbuffer = hackload_addr;
180 nti.blk_cnt = hackload_blocks;
181 nti.flag |= END_OF_FILE;
182
183 ret = mvmeprom_diskrd(&nti);
184
185 /*
186 * PROM returns 1 on end-of-file. This isn't an
187 * error in this instance, just in case you're wondering! ;-)
188 */
189 if (ret < 0 || ret > 1)
190 return ret;
191
192 blkoffset = 0;
193 }
194
195 /*
196 * Grab the required number of block(s)
197 */
198 memcpy(ti->pbuffer, &(hackload_addr[blkoffset]),
199 ti->blk_cnt * MVMEPROM_BLOCK_SIZE);
200
201 blkoffset += (ti->blk_cnt * MVMEPROM_BLOCK_SIZE);
202
203 return 0;
204 }
205