/* Copyright holders: Tenshi
   see COPYING for more details
*/
/*PRD format :
        
        word 0 - base address
        word 1 - bits 1 - 15 = byte count, bit 31 = end of transfer
*/
#include <string.h>

#include "ibm.h"
#include "ide.h"
#include "io.h"
#include "mem.h"
#include "pci.h"

#include "sio.h"

static uint8_t card_sio[256];

void sio_write(int func, int addr, uint8_t val, void *priv)
{
//        pclog("sio_write: func=%d addr=%02x val=%02x %04x:%08x\n", func, addr, val, CS, pc);

	if ((addr & 0xff) < 4)  return;

        if (func > 0)
           return;
        
        if (func == 0)
        {
                switch (addr)
                {
                        case 0x00: case 0x01: case 0x02: case 0x03:
                        case 0x08: case 0x09: case 0x0a: case 0x0b:
                        case 0x0e:
                        return;
                }
                card_sio[addr] = val;
		if (addr == 0x40)
		{
			if (!((val ^ card_sio[addr]) & 0x40))
			{
				return;
			}

			if (val & 0x40)
			{
				dma_alias_remove();
			}
			else
			{
				dma_alias_set();
			}
		}
		else if (addr == 0x4f)
		{
			if (!((val ^ card_sio[addr]) & 0x40))
			{
				return;
			}

			if (val & 0x40)
			{
				port_92_add();
			}
			else
			{
				port_92_remove();
			}
		}
        }
}

uint8_t sio_read(int func, int addr, void *priv)
{
//        pclog("sio_read: func=%d addr=%02x %04x:%08x\n", func, addr, CS, pc);

        if (func > 0)
           return 0xff;

	return card_sio[addr];
}

static int reset_reg = 0;

void sio_reset()
{
        memset(card_sio, 0, 256);
        card_sio[0x00] = 0x86; card_sio[0x01] = 0x80; /*Intel*/
        card_sio[0x02] = 0x84; card_sio[0x03] = 0x04; /*82378ZB (SIO)*/
        card_sio[0x04] = 0x07; card_sio[0x05] = 0x00;
       	card_sio[0x06] = 0x00; card_sio[0x07] = 0x02;
        card_sio[0x08] = 0x00; /*A0 stepping*/
	card_sio[0x40] = 0x20;
	card_sio[0x42] = 0x24;
	card_sio[0x45] = 0x10;
	card_sio[0x46] = 0x0F;
	card_sio[0x48] = 0x01;
	card_sio[0x4A] = 0x10;
	card_sio[0x4B] = 0x0F;
	card_sio[0x4C] = 0x56;
	card_sio[0x4D] = 0x40;
	card_sio[0x4E] = 0x07;
	card_sio[0x4F] = 0x4F;
	card_sio[0x60] = card_sio[0x61] = card_sio[0x62] = card_sio[0x63] = 0x80;
	card_sio[0x80] = 0x78;
	card_sio[0xA0] = 0x08;
	card_sio[0xA8] = 0x0F;
}

static uint8_t rc_read(uint16_t port, void *priv)
{
	return reset_reg & 0xfb;
}

static void rc_write(uint16_t port, uint8_t val, void *priv)
{
	if (!(reset_reg & 4) && (val & 4))
	{
		if (reset_reg & 2)
		{
			// pclog("SIO: Hard reset\n");
			resetpchard();
		}
		else
		{
			// pclog("SIO: Soft reset\n");
			sio_reset();
			resetide();
			softresetx86();
		}
	}
	reset_reg = val;
}

void sio_init(int card)
{
        pci_add_specific(card, sio_read, sio_write, NULL);

	sio_reset();        

	reset_reg = 0;

        io_sethandler(0x0cf9, 0x0001, rc_read, NULL, NULL, rc_write, NULL, NULL, NULL);

	port_92_reset();

        port_92_add();

	dma_alias_set();
}