/*
   //*************************************************************************
   //
   //                  P H I L I P S   P R O P R I E T A R Y
   //
   //           COPYRIGHT (c)   1997 BY PHILIPS SINGAPORE.
   //                     --  ALL RIGHTS RESERVED  --
   //
   // File Name:	ISR.C
   // Author:		Wenkai Du
   // Created:		19 Dec 97
   // Modified:
   // Revision:		3.0
   //
   //*************************************************************************
   //
   // 98/11/25 		Added I/O mode Main endpoints access. (WK)
   //*************************************************************************
   */
#include <stdio.h>
#include <string.h>

#include <reg51.h>                /* special function register declarations   */

#include "epphal.h"
#include "d12ci.h"
#include "mainloop.h"
#include "usb100.h"

extern void bus_reset(void);

extern void ep0_txdone(void);
extern void ep0_rxdone(void);

extern void ep1_txdone(void);
extern void ep1_rxdone(void);

extern void main_txdone(void);
extern void main_rxdone(void);

extern void dma_eot(void);

/*
//*************************************************************************
//  Public static data
//*************************************************************************
*/

EPPFLAGS bEPPflags;

/* Control endpoint TX/RX buffers */
extern CONTROL_XFER ControlData;

/* ISR static vars */
unsigned char idata GenEpBuf[EP1_PACKET_SIZE];
unsigned char idata EpBuf[EP2_PACKET_SIZE];
IO_REQUEST idata ioRequest;
unsigned char ioSize, ioCount;

unsigned long ClockTicks = 0;
unsigned char xdata MainEpBuf[256];

extern BOOL bNoRAM;

timer_isr() interrupt 1
{
	DISABLE;
	ClockTicks++;
	bEPPflags.bits.timer = 1;
	ENABLE;
}


usb_isr() interrupt 0
{
	DISABLE;
	fn_usb_isr();
	ENABLE;
}

void fn_usb_isr()
{
	unsigned int i_st;

	bEPPflags.bits.in_isr = 1;

	i_st = D12_ReadInterruptRegister();

	if(i_st != 0) {
		if(i_st & D12_INT_BUSRESET) {
			bus_reset();
			bEPPflags.bits.bus_reset = 1;
		}

		if(i_st & D12_INT_EOT)
			dma_eot();

		if(i_st & D12_INT_SUSPENDCHANGE)
			bEPPflags.bits.suspend = 1;

		if(i_st & D12_INT_ENDP0IN)
			ep0_txdone();
		if(i_st & D12_INT_ENDP0OUT)
			ep0_rxdone();
		if(i_st & D12_INT_ENDP1IN)
			ep1_txdone();
		if(i_st & D12_INT_ENDP1OUT)
			ep1_rxdone();
		if(i_st & D12_INT_ENDP2IN)
			main_txdone();
		if(i_st & D12_INT_ENDP2OUT)
			main_rxdone();
	}

	bEPPflags.bits.in_isr = 0;
}

void bus_reset(void)
{
}

void ep0_rxdone(void)
{
	unsigned char ep_last, i;

	ep_last = D12_ReadLastTransactionStatus(0); // Clear interrupt flag

	if (ep_last & D12_SETUPPACKET) {

		ControlData.wLength = 0;
		ControlData.wCount = 0;

		if( D12_ReadEndpoint(0, sizeof(ControlData.DeviceRequest),
			(unsigned char *)(&(ControlData.DeviceRequest))) != sizeof(DEVICE_REQUEST) ) {

			D12_SetEndpointStatus(0, 1);
			D12_SetEndpointStatus(1, 1);
			bEPPflags.bits.control_state = USB_IDLE;
			
			return;
		}

		ControlData.DeviceRequest.wValue = SWAP(ControlData.DeviceRequest.wValue);
		ControlData.DeviceRequest.wIndex = SWAP(ControlData.DeviceRequest.wIndex);
		ControlData.DeviceRequest.wLength = SWAP(ControlData.DeviceRequest.wLength);

		// Acknowledge setup here to unlock in/out endp
		D12_AcknowledgeEndpoint(0);
		D12_AcknowledgeEndpoint(1);

		ControlData.wLength = ControlData.DeviceRequest.wLength;
		ControlData.wCount = 0;

		if (ControlData.DeviceRequest.bmRequestType & (unsigned char)USB_ENDPOINT_DIRECTION_MASK) {
			bEPPflags.bits.setup_packet = 1;
			bEPPflags.bits.control_state = USB_IDLE;		/* get command */
		}
		else {
			if (ControlData.DeviceRequest.wLength == 0) {
				bEPPflags.bits.setup_packet = 1;
				bEPPflags.bits.control_state = USB_IDLE;		/* set command */
			}
			else {
				if(ControlData.DeviceRequest.wLength > MAX_CONTROLDATA_SIZE) {
					bEPPflags.bits.control_state = USB_IDLE;
					D12_SetEndpointStatus(0, 1);
					D12_SetEndpointStatus(1, 1);
				}
				else {
					bEPPflags.bits.control_state = USB_RECEIVE;	/* set command with OUT token */
				}
			} // set command with data
		} // else set command
	} // if setup packet

	else if (bEPPflags.bits.control_state == USB_RECEIVE) {
		i =	D12_ReadEndpoint(0, EP0_PACKET_SIZE,
			ControlData.dataBuffer + ControlData.wCount);

		ControlData.wCount += i;
		if( i != EP0_PACKET_SIZE || ControlData.wCount >= ControlData.wLength) {
			bEPPflags.bits.setup_packet = 1;
			bEPPflags.bits.control_state = USB_IDLE;
		}
	}

	else {
		bEPPflags.bits.control_state = USB_IDLE;
	}
}

void ep0_txdone(void)
{
	short i = ControlData.wLength - ControlData.wCount;

	D12_ReadLastTransactionStatus(1); // Clear interrupt flag

	if (bEPPflags.bits.control_state != USB_TRANSMIT) 
		return;

	if( i >= EP0_PACKET_SIZE) {
		D12_WriteEndpoint(1, EP0_PACKET_SIZE, ControlData.pData + ControlData.wCount);
		ControlData.wCount += EP0_PACKET_SIZE;

		bEPPflags.bits.control_state = USB_TRANSMIT;
	}
	else if( i != 0) {
		D12_WriteEndpoint(1, i, ControlData.pData + ControlData.wCount);
		ControlData.wCount += i;

		bEPPflags.bits.control_state = USB_IDLE;
	}
	else if (i == 0){
		D12_WriteEndpoint(1, 0, 0); // Send zero packet at the end ???

		bEPPflags.bits.control_state = USB_IDLE;
	}
}

void dma_eot(void)
{
}

void ep1_txdone(void)
{
	D12_ReadLastTransactionStatus(3); /* Clear interrupt flag */
}

void ep1_rxdone(void)
{
	unsigned char len;

	D12_ReadLastTransactionStatus(2); /* Clear interrupt flag */

	len = D12_ReadEndpoint(2, sizeof(GenEpBuf), GenEpBuf);

	if(len != 0)
		bEPPflags.bits.ep1_rxdone = 1;
}

void main_txdone(void)
{
	unsigned char len;

	D12_ReadLastTransactionStatus(5); /* Clear interrupt flag */

	len = ioSize - ioCount;
	if(len == 0) {
		if(bEPPflags.bits.dma_state == DMA_PENDING)
			bEPPflags.bits.setup_dma ++;
		else
			bEPPflags.bits.dma_state = DMA_IDLE;
	}
	else {
		if(len > 64)
			len = 64;
		if(bNoRAM)
			len = D12_WriteEndpoint(5, len, EpBuf + ioCount);
		else
			len = D12_WriteEndpoint(5, len, MainEpBuf + ioCount);
		ioCount += len;
	}
}

void main_rxdone(void)
{
	unsigned char len;

	D12_ReadLastTransactionStatus(4); /* Clear interrupt flag */

	if(bNoRAM)
		len = D12_ReadEndpoint(4, 64, EpBuf + ioCount);
	else
		len = D12_ReadEndpoint(4, 64, MainEpBuf + ioCount);
	ioCount += len;
	if(bNoRAM)
		len = D12_ReadEndpoint(4, 64, EpBuf + ioCount);
	else
		len = D12_ReadEndpoint(4, 64, MainEpBuf + ioCount);
	ioCount += len;
	if(ioCount >= ioSize) {
		if(bEPPflags.bits.dma_state == DMA_PENDING)
			bEPPflags.bits.setup_dma ++;
		else
			bEPPflags.bits.dma_state = DMA_IDLE;
	}
}