#include "rtl8139.h"

#include "string.h"
#include "stdio.h"

#define DEBUG

/*
Offset (from IO base) 	Size 	Name
0x08 	8 	MAR0-7
0x30 	4 	RBSTART
0x37 	1 	CMD
0x3C 	2 	IMR
0x3E 	2 	ISR 
*/

static rtl8139_vtable_t const rtl8139_vtable = {
	{
	rtl8139_activate,
	rtl8139_deactivate,
	rtl8139_deinit,
	rtl8139_print_info
	}
};

// registers
#define REG_MAC0 0x00
#define REG_CMD 0x37

// commands for REG_CMD register
#define CR_RESET 0x08

void rtl8139_init( rtl8139_t *rtl8139, pci_device_descriptor_t *descriptor, interrupt_t *interrupt, void *context )
{
	memset( rtl8139, 0, sizeof( rtl8139_t ) );

	network_init( (network_t *)rtl8139, interrupt, context );

	puts( "Initializing driver for Realtek 8139 network card.." );

	for( int i = 0; i < NOF_MAC_REGISTERS; i++ ) {
		port8_init( &rtl8139->MAC_port[i], descriptor->port_base + REG_MAC0 + i );
	}
	port8_init( &rtl8139->CMD_port, descriptor->port_base + REG_CMD );

	// software reset
	port8_write( &rtl8139->CMD_port, CR_RESET );

	// get MAC
	for( int i = 0; i < NOF_MAC_REGISTERS; i++ ) {
		rtl8139->base.mac_address.byte[i] = port8_read( &rtl8139->MAC_port[i] );
	}

#ifdef DEBUG
	char buf[20];
	network_mac_to_string( rtl8139->base.mac_address, buf, 20 );
	printf( "rtl8139 NIC at I/O base 0x%X, interrupt 0x%X, MAC: %s\n",
		descriptor->port_base, descriptor->interrupt, buf
		 );
#endif

	interrupt_handler_init( &rtl8139->interrupt_handler, IRQ_BASE + descriptor->interrupt, interrupt, rtl8139_handle_interrupt, rtl8139 );
	interrupts_register_interrupt_handler( rtl8139->interrupt_handler );

	((driver_t *)rtl8139)->vtable = (driver_vtable_t *)&rtl8139_vtable;
}

void rtl8139_activate( void *obj )
{
	puts( "Activating driver for Realtek 8139 network card.." );

	rtl8139_t *rtl8139 = obj;
}

void rtl8139_deactivate( void *obj )
{
	puts( "Dectivating driver for Realtek 8139 network card.." );

	rtl8139_t *rtl8139 = obj;
}

void rtl8139_deinit( void *obj )
{
	// nothing to do
}

uint32_t rtl8139_handle_interrupt( interrupt_handler_t *handler, uint32_t esp )
{
	rtl8139_t *rtl8139 = (rtl8139_t *)handler->driver;

#ifdef DEBUG
	printf( "RTL INTERRUPT\n" );
#endif

	return esp;
}

void rtl8139_print_info( void *obj )
{
	puts( "Realtek 8139 network card driver" );
}