io.cc

Linux下比较早的基于命令行的DVD播放器

//
// Copyright (c) 2004 by Istv醤 V醨adi
//
// This file is part of dxr3Player, a DVD player written specifically 
// for the DXR3 (aka Hollywood+) decoder card, but now handles other
// hardware as well. These files contain a (mostly) user-space driver 
// for the Unichrome board found on Via's EPIA motherboards.
//
// The information for implementing this driver has been gathered
// from the following sources:
//
// - The DirectFB Unichrome driver
//   Copyright (c) 2003 Andreas Robinson, All rights reserved.
//
// - Andreas Robinson's MPEG-2 decoder for the Unichrome board.
//   Copyright (c) 2003 Andreas Robinson, All rights reserved.
//
// - Via's Unichrome Framebuffer driver
//   Copyright 1998-2003 VIA Technologies, Inc. All Rights Reserved.
//   Copyright 2001-2003 S3 Graphics, Inc. All Rights Reserved.

// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

//------------------------------------------------------------------------------

#include "IO.h"

#include "util/Log.h"

#include <cstdio>

#include <unistd.h>
#include <fcntl.h>

#include <sys/mman.h>

extern "C" {
#include <pci/pci.h>
}

//------------------------------------------------------------------------------

using unichrome::IO;

//------------------------------------------------------------------------------

IO::IO() :
    framebuffer(0),
    mmio(0),
    revision(0),
    sequencer(PORT_SEQUENCER),
    control(PORT_CONTROL),
    graphics(PORT_GRAPHICS),
    status(PORT_STATUS),
    attribute(PORT_ATTRIBUTE),
    miscOutput(PORT_MISC_OUTPUT),
    miscOutput2(PORT_MISC_OUTPUT2),
    miscInput(PORT_MISC_INPUT),
    i2c(*this)
{
    pci_access* pacc = pci_alloc();
    
    pci_init(pacc);
    pci_scan_bus(pacc);

    for(pci_dev* dev = pacc->devices; dev!=0; dev=dev->next) {
        pci_fill_info(dev, PCI_FILL_IDENT | PCI_FILL_BASES | PCI_FILL_SIZES);
        if (dev->vendor_id==VENDOR_ID && dev->device_id==DEVICE_ID) {
            // FIXME: POSIX::open
            int fd = open("/dev/mem", O_RDWR);
            if (fd<0) {
                perror("open(/dev/mem)");
                abort();
            }
            
            // FIXME: POSIX::mmap
            framebuffer = mmap(0, FRAMEBUFFER_SIZE, 
                               PROT_READ|PROT_WRITE, MAP_SHARED,
                               fd, dev->base_addr[BASEIDX_FRAMEBUFFER] & 
                               PCI_ADDR_MEM_MASK);
            if (framebuffer==MAP_FAILED) {
                perror("mmap(framebuffer)");
                abort();
            }

            mmioSize = dev->size[BASEIDX_MMIO];
            mmio = mmap(0, mmioSize,
                        PROT_READ|PROT_WRITE, MAP_SHARED,
                        fd, dev->base_addr[BASEIDX_MMIO] & PCI_ADDR_MEM_MASK);
            if (mmio==MAP_FAILED) {
                perror("mmap(mmio)");
                abort();
            }

            close(fd);

            Log::debug("Unichrome framebbufer @%p, mmio @%p\n", framebuffer, mmio);
        }
        if (dev->bus==0 && dev->dev==0 && dev->func==0) {
            revision = pci_read_byte(dev, 0xf6);
        }
    }

    pci_cleanup(pacc);

    if (framebuffer==0 || mmio==0) {
        Log::debug("Cannot find Unichrome device!\n");
        abort();
    } else {
        Log::debug("Unichrome revision %u\n", revision);
    }

    if (ioperm(0x3c0, 32, 1)<0) {
        perror("ioperm");
        abort();
    }
}

//------------------------------------------------------------------------------

IO::~IO()
{
    ioperm(0x3c0, 32, 0);

    munmap(mmio, mmioSize);
    munmap(framebuffer, FRAMEBUFFER_SIZE);
}

//------------------------------------------------------------------------------