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/* $OpenBSD: cardbus_exrom.c,v 1.5 2013/06/20 09:52:09 mpi Exp $ */
/* $NetBSD: cardbus_exrom.c,v 1.4 2000/02/03 06:47:31 thorpej Exp $ */
/*
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to
* The NetBSD Foundation by Johan Danielsson.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/queue.h>
#include <sys/malloc.h>
#include <machine/bus.h>
#include <dev/cardbus/cardbus_exrom.h>
#if defined(CARDBUS_DEBUG)
#define DPRINTF(a) printf a
#else
#define DPRINTF(a)
#endif
#define READ_INT16(T, H, O) \
(bus_space_read_1((T), (H), (O)) | \
(bus_space_read_1((T), (H), (O) + 1) << 8))
/*
* A PCI ROM is divided into a number of images. Each image has two
* data structures, a header located at the start of the image, and a
* `data structure' at some offset into it.
*
* The header is a 26 byte structure:
*
* Offset Length Description
* 0x00 1 signature byte 1 (0x55)
* 0x01 1 signature byte 2 (0xAA)
* 0x02 22 processor architecture data
* 0x18 2 pointer to the data structure
*
* The data structure is a 24 byte structure:
*
* Offset Length Description
* 0x00 4 signature (PCIR)
* 0x04 2 vendor id
* 0x06 2 device id
* 0x08 2 reserved
* 0x0A 2 data structure length
* 0x0C 1 data structure revision (0)
* 0x0D 3 class code
* 0x10 2 image length (in 512 byte blocks)
* 0x12 2 code revision level
* 0x14 1 code type
* 0x15 1 indicator (bit 7 indicates final image)
* 0x16 2 reserved
*
*/
/*
* Scan through a PCI expansion ROM, and create subregions for each
* ROM image. This function assumes that the ROM is mapped at
* (tag,handle), and that the expansion ROM address decoder is
* enabled. The PCI specification requires that no other BAR should
* be accessed while the ROM is enabled, so interrupts should be
* disabled.
*
* XXX This routine is way too pessimistic and returns as soon as it encounters
* a problem, although not being able to malloc or read a particular image
* may not prevent further images from being read successfully.
*/
int
cardbus_read_exrom(bus_space_tag_t romt, bus_space_handle_t romh,
struct cardbus_rom_image_head *head)
{
size_t addr = 0; /* offset of current rom image */
size_t dataptr;
unsigned int rom_image = 0;
size_t image_size;
struct cardbus_rom_image *image;
u_int16_t val;
SIMPLEQ_INIT(head);
do {
val = READ_INT16(romt, romh, addr + CARDBUS_EXROM_SIGNATURE);
if (val != 0xaa55) {
DPRINTF(("%s: bad header signature in ROM image "
"%u: 0x%04x\n", __func__, rom_image, val));
return (1);
}
dataptr = addr + READ_INT16(romt, romh,
addr + CARDBUS_EXROM_DATA_PTR);
/* get the ROM image size, in blocks */
image_size = READ_INT16(romt, romh,
dataptr + CARDBUS_EXROM_DATA_IMAGE_LENGTH);
/* XXX
* Some ROMs seem to have this as zero, can we assume
* this means 1 block?
*/
if (image_size == 0)
image_size = 1;
image_size <<= 9;
image = malloc(sizeof(*image), M_DEVBUF, M_NOWAIT);
if (image == NULL) {
DPRINTF(("%s: out of memory\n", __func__));
return (1);
}
image->rom_image = rom_image;
image->image_size = image_size;
image->romt = romt;
if (bus_space_subregion(romt, romh, addr,
image_size, &image->romh)) {
DPRINTF(("%s: bus_space_subregion failed", __func__));
free(image, M_DEVBUF);
return (1);
}
SIMPLEQ_INSERT_TAIL(head, image, next);
addr += image_size;
rom_image++;
} while ((bus_space_read_1(romt, romh,
dataptr + CARDBUS_EXROM_DATA_INDICATOR) & 0x80) == 0);
return (0);
}
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