Annotation of sys/dev/cardbus/cardbus_exrom.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: cardbus_exrom.c,v 1.4 2005/09/13 18:44:38 fgsch Exp $ */
2: /* $NetBSD: cardbus_exrom.c,v 1.4 2000/02/03 06:47:31 thorpej Exp $ */
3:
4: /*
5: * Copyright (c) 1999 The NetBSD Foundation, Inc.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to
9: * The NetBSD Foundation by Johan Danielsson.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: *
15: * 1. Redistributions of source code must retain the above copyright
16: * notice, this list of conditions and the following disclaimer.
17: *
18: * 2. Redistributions in binary form must reproduce the above copyright
19: * notice, this list of conditions and the following disclaimer in the
20: * documentation and/or other materials provided with the distribution.
21: *
22: * 3. Neither the name of The NetBSD Foundation nor the names of its
23: * contributors may be used to endorse or promote products derived
24: * from this software without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36: * POSSIBILITY OF SUCH DAMAGE.
37: */
38:
39: #include <sys/param.h>
40: #include <sys/systm.h>
41: #include <sys/queue.h>
42: #include <sys/malloc.h>
43:
44: #include <machine/bus.h>
45:
46: #include <dev/cardbus/cardbus_exrom.h>
47:
48: #if defined(CARDBUS_DEBUG)
49: #define DPRINTF(a) printf a
50: #else
51: #define DPRINTF(a)
52: #endif
53:
54: #define READ_INT16(T, H, O) \
55: (bus_space_read_1((T), (H), (O)) | \
56: (bus_space_read_1((T), (H), (O) + 1) << 8))
57:
58: /*
59: * A PCI ROM is divided into a number of images. Each image has two
60: * data structures, a header located at the start of the image, and a
61: * `data structure' at some offset into it.
62: *
63: * The header is a 26 byte structure:
64: *
65: * Offset Length Description
66: * 0x00 1 signature byte 1 (0x55)
67: * 0x01 1 signature byte 2 (0xAA)
68: * 0x02 22 processor architecture data
69: * 0x18 2 pointer to the data structure
70: *
71: * The data structure is a 24 byte structure:
72: *
73: * Offset Length Description
74: * 0x00 4 signature (PCIR)
75: * 0x04 2 vendor id
76: * 0x06 2 device id
77: * 0x08 2 reserved
78: * 0x0A 2 data structure length
79: * 0x0C 1 data structure revision (0)
80: * 0x0D 3 class code
81: * 0x10 2 image length (in 512 byte blocks)
82: * 0x12 2 code revision level
83: * 0x14 1 code type
84: * 0x15 1 indicator (bit 7 indicates final image)
85: * 0x16 2 reserved
86: *
87: */
88:
89: /*
90: * Scan through a PCI expansion ROM, and create subregions for each
91: * ROM image. This function assumes that the ROM is mapped at
92: * (tag,handle), and that the expansion ROM address decoder is
93: * enabled. The PCI specification requires that no other BAR should
94: * be accessed while the ROM is enabled, so interrupts should be
95: * disabled.
96: *
97: * XXX This routine is way too pessimistic and returns as soon as it encounters
98: * a problem, although not being able to malloc or read a particular image
99: * may not prevent further images from being read successfully.
100: */
101: int
102: cardbus_read_exrom(bus_space_tag_t romt, bus_space_handle_t romh,
103: struct cardbus_rom_image_head *head)
104: {
105: size_t addr = 0; /* offset of current rom image */
106: size_t dataptr;
107: unsigned int rom_image = 0;
108: size_t image_size;
109: struct cardbus_rom_image *image;
110: u_int16_t val;
111:
112: SIMPLEQ_INIT(head);
113: do {
114: val = READ_INT16(romt, romh, addr + CARDBUS_EXROM_SIGNATURE);
115: if (val != 0xaa55) {
116: DPRINTF(("%s: bad header signature in ROM image "
117: "%u: 0x%04x\n", __func__, rom_image, val));
118: return (1);
119: }
120: dataptr = addr + READ_INT16(romt, romh,
121: addr + CARDBUS_EXROM_DATA_PTR);
122:
123: /* get the ROM image size, in blocks */
124: image_size = READ_INT16(romt, romh,
125: dataptr + CARDBUS_EXROM_DATA_IMAGE_LENGTH);
126: /* XXX
127: * Some ROMs seem to have this as zero, can we assume
128: * this means 1 block?
129: */
130: if (image_size == 0)
131: image_size = 1;
132: image_size <<= 9;
133:
134: image = malloc(sizeof(*image), M_DEVBUF, M_NOWAIT);
135: if (image == NULL) {
136: DPRINTF(("%s: out of memory\n", __func__));
137: return (1);
138: }
139: image->rom_image = rom_image;
140: image->image_size = image_size;
141: image->romt = romt;
142: if (bus_space_subregion(romt, romh, addr,
143: image_size, &image->romh)) {
144: DPRINTF(("%s: bus_space_subregion failed", __func__));
145: free(image, M_DEVBUF);
146: return (1);
147: }
148: SIMPLEQ_INSERT_TAIL(head, image, next);
149: addr += image_size;
150: rom_image++;
151: } while ((bus_space_read_1(romt, romh,
152: dataptr + CARDBUS_EXROM_DATA_INDICATOR) & 0x80) == 0);
153:
154: return (0);
155: }
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