/*  DEV9null
 *  Copyright (C) 2002-2010  PCSX2 Dev Team
 *
 *  PCSX2 is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU Lesser General Public License as published by the Free Software Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  PCSX2 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 PCSX2.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

// Note: I was using MegaDev9, dev9ghzdrk, and dev9linuz  for reference on memory locations.
// The ones I included were just some of the more important ones, so you may want to look
// at the plugins I mentioned if trying to create your own dev9 plugin.

// Additionally, there is a lot of information in the ps2drv drivers by Marcus R. Brown, so
// looking through its code would be a good starting point.

// Look under tags/plugins in svn for any older plugins that aren't included in pcsx2 any more.
// --arcum42


#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <string>

#include "DEV9.h"
#include "svnrev.h"
#include "null/config.inl"

const unsigned char version = PS2E_DEV9_VERSION;
const unsigned char revision = 0;
const unsigned char build = 5; // increase that with each version

static char libraryName[256];

// Our IRQ call.
void (*DEV9irq)(int);

__aligned16 s8 dev9regs[0x10000];

std::string s_strIniPath = "inis";
std::string s_strLogPath = "logs";

EXPORT_C_(void)
DEV9configure()
{
    const std::string ini_path = s_strIniPath + "/Dev9null.ini";
    LoadConfig(ini_path);
    ConfigureLogging();
    SaveConfig(ini_path);
}

void LogInit()
{
    const std::string LogFile(s_strLogPath + "/dev9null.log");
    g_plugin_log.Open(LogFile);
}

EXPORT_C_(void)
DEV9setLogDir(const char *dir)
{
    // Get the path to the log directory.
    s_strLogPath = (dir == NULL) ? "logs" : dir;

    // Reload the log file after updated the path
    g_plugin_log.Close();
    LogInit();
}

EXPORT_C_(u32)
PS2EgetLibType()
{
    return PS2E_LT_DEV9;
}

EXPORT_C_(const char *)
PS2EgetLibName()
{
    snprintf(libraryName, 255, "DEV9null Driver %lld%s", SVN_REV, SVN_MODS ? "m" : "");
    return libraryName;
}

EXPORT_C_(u32)
PS2EgetLibVersion2(u32 type)
{
    return (version << 16) | (revision << 8) | build;
}

EXPORT_C_(s32)
DEV9init()
{
    LoadConfig(s_strIniPath + "/Dev9null.ini");
    LogInit();
    g_plugin_log.WriteLn("dev9null plugin version %d,%d", revision, build);
    g_plugin_log.WriteLn("Initializing dev9null");
    // Initialize anything that needs to be initialized.
    memset(dev9regs, 0, sizeof(dev9regs));
    return 0;
}

EXPORT_C_(void)
DEV9shutdown()
{
    g_plugin_log.WriteLn("Shutting down Dev9null.");
    g_plugin_log.Close();
}

EXPORT_C_(s32)
DEV9open(void *pDsp)
{
    g_plugin_log.WriteLn("Opening Dev9null.");
    // Get anything ready we need to. Opening and creating hard
    // drive files, for example.
    return 0;
}

EXPORT_C_(void)
DEV9close()
{
    g_plugin_log.WriteLn("Closing Dev9null.");
    // Close files opened.
}

EXPORT_C_(u8)
DEV9read8(u32 addr)
{
    u8 value = 0;

    switch (addr) {
        //        case 0x1F80146E:		// DEV9 hardware type (0x32 for an expansion bay)
        case 0x10000038: /*value = dev9Ru8(addr);*/
            break;       // We need to have at least one case to avoid warnings.
        default:
            //value = dev9Ru8(addr);
            g_plugin_log.WriteLn("*Unknown 8 bit read at address %lx", addr);
            break;
    }
    return value;
}

EXPORT_C_(u16)
DEV9read16(u32 addr)
{
    u16 value = 0;

    switch (addr) {
        // Addresses you may want to catch here include:
        //			case 0x1F80146E:		// DEV9 hardware type (0x32 for an expansion bay)
        //			case 0x10000002:		// The Smart Chip revision. Should be 0x11
        //			case 0x10000004:		// More type info: bit 0 - smap; bit 1 - hd; bit 5 - flash
        //			case 0x1000000E:		// Similar to the last; bit 1 should be set if a hd is hooked up.
        //			case 0x10000028:			// intr_stat
        //			case 0x10000038:			// hard drives seem to like reading and writing the max dma size per transfer here.
        //			case 0x1000002A:			// intr_mask
        //			case 0x10000040:			// pio_data
        //			case 0x10000044:			// nsector
        //			case 0x10000046:			// sector
        //			case 0x10000048:			// lcyl
        //			case 0x1000004A:			// hcyl
        //			case 0x1000004C:			// select
        //			case 0x1000004E:			// status
        //			case 0x1000005C:			// status
        //			case 0x10000064:			// if_ctrl
        case 0x10000038: /*value = dev9Ru16(addr);*/
            break;
        default:
            //value = dev9Ru16(addr);
            g_plugin_log.WriteLn("*Unknown 16 bit read at address %lx", addr);
            break;
    }

    return value;
}

EXPORT_C_(u32)
DEV9read32(u32 addr)
{
    u32 value = 0;

    switch (addr) {
        case 0x10000038: /*value = dev9Ru32(addr);*/
            break;
        default:
            //value = dev9Ru32(addr);
            g_plugin_log.WriteLn("*Unknown 32 bit read at address %lx", addr);
            break;
    }

    return value;
}

EXPORT_C_(void)
DEV9write8(u32 addr, u8 value)
{
    switch (addr) {
        case 0x10000038: /*dev9Ru8(addr) = value;*/
            break;
        default:
            g_plugin_log.WriteLn("*Unknown 8 bit write; address %lx = %x", addr, value);
            //dev9Ru8(addr) = value;
            break;
    }
}

EXPORT_C_(void)
DEV9write16(u32 addr, u16 value)
{
    switch (addr) {
        // Remember that list on DEV9read16? You'll want to write to a
        // lot of them, too.
        case 0x10000038: /*dev9Ru16(addr) = value;*/
            break;
        default:
            g_plugin_log.WriteLn("*Unknown 16 bit write; address %lx = %x", addr, value);
            //dev9Ru16(addr) = value;
            break;
    }
}

EXPORT_C_(void)
DEV9write32(u32 addr, u32 value)
{
    switch (addr) {
        case 0x10000038: /*dev9Ru32(addr) = value;*/
            break;
        default:
            g_plugin_log.WriteLn("*Unknown 32 bit write; address %lx = %x", addr, value);
            //dev9Ru32(addr) = value;
            break;
    }
}

EXPORT_C_(s32)
DEV9dmaRead(s32 channel, u32 *data, u32 bytesLeft, u32 *bytesProcessed)
{
    // You'll want to put your own DMA8 reading code here.
    // Time to interact with your fake (or real) hardware.
    g_plugin_log.WriteLn("Reading DMA8 Mem.");
    *bytesProcessed = bytesLeft;
    return 0;
}

EXPORT_C_(s32)
DEV9dmaWrite(s32 channel, u32 *data, u32 bytesLeft, u32 *bytesProcessed)
{
    // See above.
    g_plugin_log.WriteLn("Writing DMA8 Mem.");
    *bytesProcessed = bytesLeft;
    return 0;
}

EXPORT_C_(void)
DEV9dmaInterrupt(s32 channel)
{
    // See above.
}

EXPORT_C_(void)
DEV9readDMA8Mem(u32 *pMem, int size)
{
    // You'll want to put your own DMA8 reading code here.
    // Time to interact with your fake (or real) hardware.
    g_plugin_log.WriteLn("Reading DMA8 Mem.");
}

EXPORT_C_(void)
DEV9writeDMA8Mem(u32 *pMem, int size)
{
    // See above.
    g_plugin_log.WriteLn("Writing DMA8 Mem.");
}

EXPORT_C_(void)
DEV9irqCallback(DEV9callback callback)
{
    // Setting our callback. You will call it with DEV9irq(cycles),
    // Where cycles is the number of cycles till the irq is triggered.
    DEV9irq = callback;
}

int _DEV9irqHandler(void)
{
    // And this gets called when the irq is triggered.
    return 0;
}

EXPORT_C_(DEV9handler)
DEV9irqHandler(void)
{
    // Pass it to pcsx2.
    return (DEV9handler)_DEV9irqHandler;
}

EXPORT_C_(void)
DEV9setSettingsDir(const char *dir)
{
    // Grab the ini directory.
    s_strIniPath = (dir == NULL) ? "inis" : dir;
}

// extended funcs

EXPORT_C_(s32)
DEV9test()
{
    return 0;
}

EXPORT_C_(s32)
DEV9freeze(int mode, freezeData *data)
{
    // This should store or retrieve any information, for if emulation
    // gets suspended, or for savestates.
    switch (mode) {
        case FREEZE_LOAD:
            // Load previously saved data.
            break;
        case FREEZE_SAVE:
            // Save data.
            break;
        case FREEZE_SIZE:
            // return the size of the data.
            break;
    }
    return 0;
}