Annotation of sys/dev/cardbus/cardbus_exrom.c, Revision 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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