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/*
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* (C) Copyright IBM Corporation 2007
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* on the rights to use, copy, modify, merge, publish, distribute, sub
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* license, and/or sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file linux_devmem.c
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* Access PCI subsystem using Linux's the old /dev/mem interface.
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*
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* \note
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* This is currently just a skeleton. It only includes the /dev/mem based
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* function for reading the device ROM.
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*
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* \author Ian Romanick <idr@us.ibm.com>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <dirent.h>
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#include <errno.h>
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#include "pciaccess.h"
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#include "pciaccess_private.h"
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#include "linux_devmem.h"
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/**
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* Read a device's expansion ROM using /dev/mem.
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*
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* \note
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* This function could probably be used, as-is, on other platforms that have
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* a /dev/mem interface.
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*
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* \bugs
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* Before using the VGA special case code, this function should check that
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* VGA access are routed to the device. Right?
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*/
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_pci_hidden int
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pci_device_linux_devmem_read_rom(struct pci_device *dev, void *buffer)
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{
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struct pci_device_private *priv = (struct pci_device_private *) dev;
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int fd;
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int err = 0;
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uint32_t rom_base_tmp;
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pciaddr_t rom_base;
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pciaddr_t rom_size;
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int PCI_ROM;
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/* Handle some special cases of legacy devices.
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*/
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if (priv->base.rom_size == 0) {
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/* VGA ROMs are supposed to be at 0xC0000.
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*/
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if ((priv->base.device_class & 0x00ffff00) == 0x000030000) {
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rom_base = 0x000C0000;
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rom_size = 0x00010000;
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PCI_ROM = 0;
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}
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else {
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/* "Function not implemented."
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*/
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return ENOSYS;
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}
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}
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else {
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rom_base = priv->rom_base;
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rom_size = priv->base.rom_size;
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PCI_ROM = 1;
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}
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/* Enable the device's ROM.
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*/
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if (PCI_ROM) {
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err = pci_device_cfg_read_u32(& priv->base, & rom_base_tmp, 48);
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if (err) {
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return err;
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}
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if ((rom_base_tmp & 0x000000001) == 0) {
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err = pci_device_cfg_write_u32(& priv->base,
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rom_base_tmp | 1, 48);
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if (err) {
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return err;
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}
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}
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}
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/* Read the portion of /dev/mem that corresponds to the device's ROM.
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*/
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fd = open("/dev/mem", O_RDONLY, 0);
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if (fd < 0) {
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err = errno;
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}
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else {
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size_t bytes;
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for (bytes = 0; bytes < rom_size; /* empty */) {
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const ssize_t got = pread(fd, buffer, rom_size - bytes,
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rom_base + bytes);
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if (got == -1) {
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err = errno;
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break;
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}
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bytes += got;
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}
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close(fd);
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}
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/* Disable the device's ROM.
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*/
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if (PCI_ROM && ((rom_base_tmp & 0x000000001) == 0)) {
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const int tmp_err = pci_device_cfg_write_u32(& priv->base,
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rom_base_tmp, 48);
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/* Prefer to return the first error that occurred.
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*/
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if (err == 0) {
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err = tmp_err;
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}
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}
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return err;
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}
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