cardbus_exrom.c revision 1.10
1/* $NetBSD: cardbus_exrom.c,v 1.10 2007/10/19 11:59:38 ad Exp $ */ 2 3/* 4 * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to 8 * The NetBSD Foundation by Johan Danielsson. 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 * 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * 3. Neither the name of The NetBSD Foundation nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38#include <sys/cdefs.h> 39__KERNEL_RCSID(0, "$NetBSD: cardbus_exrom.c,v 1.10 2007/10/19 11:59:38 ad Exp $"); 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/queue.h> 44#include <sys/malloc.h> 45 46#include <sys/bus.h> 47 48#include <dev/cardbus/cardbus_exrom.h> 49 50#define READ_INT16(T, H, O) \ 51 (bus_space_read_1((T), (H), (O)) | \ 52 (bus_space_read_1((T), (H), (O) + 1) << 8)) 53 54/* A PCI ROM is divided into a number of images. Each image has two 55 * data structures, a header located at the start of the image, and a 56 * `data structure' at some offset into it. 57 * 58 * The header is a 26 byte structure: 59 * 60 * Offset Length Description 61 * 0x00 1 signature byte 1 (0x55) 62 * 0x01 1 signature byte 2 (0xAA) 63 * 0x02 22 processor architecture data 64 * 0x18 2 pointer to the data structure 65 * 66 * The data structure is a 24 byte structure: 67 * 68 * Offset Length Description 69 * 0x00 4 signature (PCIR) 70 * 0x04 2 vendor id 71 * 0x06 2 device id 72 * 0x08 2 reserved 73 * 0x0A 2 data structure length 74 * 0x0C 1 data structure revision (0) 75 * 0x0D 3 class code 76 * 0x10 2 image length (in 512 byte blocks) 77 * 0x12 2 code revision level 78 * 0x14 1 code type 79 * 0x15 1 indicator (bit 7 indicates final image) 80 * 0x16 2 reserved 81 * 82 */ 83 84/* 85 * Scan through a PCI expansion ROM, and create subregions for each 86 * ROM image. This function assumes that the ROM is mapped at 87 * (tag,handle), and that the expansion ROM address decoder is 88 * enabled. The PCI specification requires that no other BAR should 89 * be accessed while the ROM is enabled, so interrupts should be 90 * disabled. 91 */ 92 93int 94cardbus_read_exrom(bus_space_tag_t romt, bus_space_handle_t romh, 95 struct cardbus_rom_image_head *head) 96{ 97 static const char thisfunc[] = "cardbus_read_exrom"; 98 size_t addr = 0; /* offset of current rom image */ 99 size_t dataptr; 100 unsigned int rom_image = 0; 101 102 SIMPLEQ_INIT(head); 103 do { 104 size_t image_size; 105 struct cardbus_rom_image *image; 106 u_int16_t val; 107 108 val = READ_INT16(romt, romh, addr + CARDBUS_EXROM_SIGNATURE); 109 if (val != 0xaa55) { 110 printf("%s: " 111 "bad header signature in ROM image %u: 0x%04x\n", 112 thisfunc, rom_image, val); 113 return 1; 114 } 115 dataptr = addr + 116 READ_INT16(romt, romh, addr + CARDBUS_EXROM_DATA_PTR); 117 /* get the ROM image size, in blocks */ 118 image_size = READ_INT16(romt, romh, 119 dataptr + CARDBUS_EXROM_DATA_IMAGE_LENGTH); 120 if (image_size == 0) 121 /* 122 * XXX some ROMs seem to have this as zero, 123 * can we assume this means 1 block? 124 */ 125 image_size = 1; 126 image_size <<= 9; 127 image = malloc(sizeof(*image), M_DEVBUF, M_NOWAIT); 128 if (image == NULL) { 129 printf("%s: out of memory\n", thisfunc); 130 return 1; 131 } 132 image->rom_image = rom_image; 133 image->image_size = image_size; 134 image->romt = romt; 135 if (bus_space_subregion(romt, romh, addr, 136 image_size, &image->romh)) { 137 printf("%s: bus_space_subregion failed", thisfunc); 138 free(image, M_DEVBUF); 139 return 1; 140 } 141 SIMPLEQ_INSERT_TAIL(head, image, next); 142 addr += image_size; 143 rom_image++; 144 } while ((bus_space_read_1(romt, romh, 145 dataptr + CARDBUS_EXROM_DATA_INDICATOR) & 0x80) == 0); 146 return 0; 147} 148 149 150#if 0 151struct cardbus_exrom_data_structure { 152 char signature[4]; 153 cardbusreg_t id; /* vendor & device id */ 154 u_int16_t structure_length; 155 u_int8_t structure_revision; 156 cardbusreg_t class; /* class code in upper 24 bits */ 157 u_int16_t image_length; 158 u_int16_t data_revision; 159 u_int8_t code_type; 160 u_int8_t indicator; 161}; 162 163void 164pci_exrom_parse_data_structure(bus_space_tag_t tag, 165 bus_space_handle_t handle, 166 struct pci_exrom_data_structure *ds) 167{ 168 unsigned char hdr[16]; 169 170 bus_space_read_region_1(tag, handle, dataptr, hdr, sizeof(hdr)); 171 memcpy(header->signature, hdr + PCI_EXROM_DATA_SIGNATURE, 4); 172#define LEINT16(B, O) ((B)[(O)] | ((B)[(O) + 1] << 8)) 173 header->id = LEINT16(hdr, PCI_EXROM_DATA_VENDOR_ID) | 174 (LEINT16(hdr, PCI_EXROM_DATA_DEVICE_ID) << 16); 175 header->structure_length = LEINT16(hdr, PCI_EXROM_DATA_LENGTH); 176 header->structure_rev = hdr[PCI_EXROM_DATA_REV]; 177 header->class = (hdr[PCI_EXROM_DATA_CLASS_CODE] << 8) | 178 (hdr[PCI_EXROM_DATA_CLASS_CODE + 1] << 16) | 179 (hdr[PCI_EXROM_DATA_CLASS_CODE + 2] << 24); 180 header->image_length = LEINT16(hdr, PCI_EXROM_DATA_IMAGE_LENGTH) << 16; 181 header->data_revision = LEINT16(hdr, PCI_EXROM_DATA_DATA_REV); 182 header->code_type = hdr[PCI_EXROM_DATA_CODE_TYPE]; 183 header->indicator = hdr[PCI_EXROM_DATA_INDICATOR]; 184 length = min(length, header->image_length - 0x18 - offset); 185 bus_space_read_region_1(tag, handle, dataptr + 0x18 + offset, 186 buf, length); 187 ret = length; 188} 189#endif 190