/* Only eth0 supported for now
 *
 * (C) Copyright 2003
 * Thomas.Lange@corelatus.se
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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 <config.h>

#ifdef CONFIG_AU1X00

#if defined(CFG_DISCOVER_PHY) || (CONFIG_COMMANDS & CFG_CMD_MII)
#error "PHY and MII not supported yet"
/* We just assume that we are running 100FD for now */
/* We all use switches, right? ;-) */
#endif

/* I assume ethernet behaves like au1000 */

#ifdef CONFIG_AU1000
/* Base address differ between cpu:s */
#define ETH0_BASE AU1000_ETH0_BASE
#define MAC0_ENABLE AU1000_MAC0_ENABLE
#else
#ifdef CONFIG_AU1100
#define ETH0_BASE AU1100_ETH0_BASE
#define MAC0_ENABLE AU1100_MAC0_ENABLE
#else
#ifdef CONFIG_AU1500
#define ETH0_BASE AU1500_ETH0_BASE
#define MAC0_ENABLE AU1500_MAC0_ENABLE
#else
#error "No valid cpu set"
#endif
#endif
#endif

#include <common.h>
#include <malloc.h>
#include <net.h>
#include <command.h>
#include <asm/io.h>
#include <asm/au1x00.h>

/* Ethernet Transmit and Receive Buffers */
#define DBUF_LENGTH  1520
#define PKT_MAXBUF_SIZE		1518

static char txbuf[DBUF_LENGTH];

static int next_tx;
static int next_rx;

/* 4 rx and 4 tx fifos */
#define NO_OF_FIFOS 4

typedef struct{
	u32 status;
	u32 addr;
	u32 len; /* Only used for tx */
	u32 not_used;
} mac_fifo_t;

mac_fifo_t mac_fifo[NO_OF_FIFOS];

#define MAX_WAIT 1000

static int au1x00_send(struct eth_device* dev, volatile void *packet, int length){
	volatile mac_fifo_t *fifo_tx =
		(volatile mac_fifo_t*)(MAC0_TX_DMA_ADDR+MAC_TX_BUFF0_STATUS);
	int i;
	int res;

	/* tx fifo should always be idle */
	fifo_tx[next_tx].len = length;
	fifo_tx[next_tx].addr = (virt_to_phys(packet))|TX_DMA_ENABLE;
	au_sync();

	udelay(1);
	i=0;
	while(!(fifo_tx[next_tx].addr&TX_T_DONE)){
		if(i>MAX_WAIT){
			printf("TX timeout\n");
			break;
		}
		udelay(1);
		i++;
	}

	/* Clear done bit */
	fifo_tx[next_tx].addr = 0;
	fifo_tx[next_tx].len = 0;
	au_sync();

	res = fifo_tx[next_tx].status;

	next_tx++;
	if(next_tx>=NO_OF_FIFOS){
		next_tx=0;
	}
	return(res);
}

static int au1x00_recv(struct eth_device* dev){
	volatile mac_fifo_t *fifo_rx =
		(volatile mac_fifo_t*)(MAC0_RX_DMA_ADDR+MAC_RX_BUFF0_STATUS);

	int length;
	u32 status;

	for(;;){
		if(!(fifo_rx[next_rx].addr&RX_T_DONE)){
			/* Nothing has been received */
			return(-1);
		}

		status = fifo_rx[next_rx].status;

		length = status&0x3FFF;

		if(status&RX_ERROR){
			printf("Rx error 0x%x\n", status);
		}
		else{
			/* Pass the packet up to the protocol layers. */
			NetReceive(NetRxPackets[next_rx], length - 4);
		}

		fifo_rx[next_rx].addr = (virt_to_phys(NetRxPackets[next_rx]))|RX_DMA_ENABLE;

		next_rx++;
		if(next_rx>=NO_OF_FIFOS){
			next_rx=0;
		}
	} /* for */

	return(0); /* Does anyone use this? */
}

static int au1x00_init(struct eth_device* dev, bd_t * bd){

	volatile u32 *macen = (volatile u32*)MAC0_ENABLE;
	volatile u32 *mac_ctrl = (volatile u32*)(ETH0_BASE+MAC_CONTROL);
	volatile u32 *mac_addr_high = (volatile u32*)(ETH0_BASE+MAC_ADDRESS_HIGH);
	volatile u32 *mac_addr_low = (volatile u32*)(ETH0_BASE+MAC_ADDRESS_LOW);
	volatile u32 *mac_mcast_high = (volatile u32*)(ETH0_BASE+MAC_MCAST_HIGH);
	volatile u32 *mac_mcast_low = (volatile u32*)(ETH0_BASE+MAC_MCAST_LOW);
	volatile mac_fifo_t *fifo_tx =
		(volatile mac_fifo_t*)(MAC0_TX_DMA_ADDR+MAC_TX_BUFF0_STATUS);
	volatile mac_fifo_t *fifo_rx =
		(volatile mac_fifo_t*)(MAC0_RX_DMA_ADDR+MAC_RX_BUFF0_STATUS);
	int i;

	next_tx = 0;
	next_rx = 0;

	/* We have to enable clocks before releasing reset */
	*macen = MAC_EN_CLOCK_ENABLE;
	udelay(10);

	/* Enable MAC0 */
	/* We have to release reset before accessing registers */
	*macen = MAC_EN_CLOCK_ENABLE|MAC_EN_RESET0|
		MAC_EN_RESET1|MAC_EN_RESET2;
	udelay(10);

	for(i=0;i<NO_OF_FIFOS;i++){
		fifo_tx[i].len = 0;
		fifo_tx[i].addr = virt_to_phys(&txbuf[0]);
		fifo_rx[i].addr = (virt_to_phys(NetRxPackets[i]))|RX_DMA_ENABLE;
	}

	/* Put mac addr in little endian */
#define ea eth_get_dev()->enetaddr
	*mac_addr_high  =	(ea[5] <<  8) | (ea[4]	    ) ;
	*mac_addr_low   =	(ea[3] << 24) | (ea[2] << 16) |
		(ea[1] <<  8) | (ea[0]      ) ;
#undef ea
	*mac_mcast_low = 0;
	*mac_mcast_high = 0;

	/* Make sure the MAC buffer is in the correct endian mode */
#ifdef __LITTLE_ENDIAN
	*mac_ctrl = MAC_FULL_DUPLEX;
	udelay(1);
	*mac_ctrl = MAC_FULL_DUPLEX|MAC_RX_ENABLE|MAC_TX_ENABLE;
#else
	*mac_ctrl = MAC_BIG_ENDIAN|MAC_FULL_DUPLEX;
	udelay(1);
	*mac_ctrl = MAC_BIG_ENDIAN|MAC_FULL_DUPLEX|MAC_RX_ENABLE|MAC_TX_ENABLE;
#endif

	return(1);
}

static void au1x00_halt(struct eth_device* dev){
}

int au1x00_enet_initialize(bd_t *bis){
	struct eth_device* dev;

	dev = (struct eth_device*) malloc(sizeof *dev);
	memset(dev, 0, sizeof *dev);

	sprintf(dev->name, "Au1X00 ETHERNET");
	dev->iobase = 0;
	dev->priv   = 0;
	dev->init   = au1x00_init;
	dev->halt   = au1x00_halt;
	dev->send   = au1x00_send;
	dev->recv   = au1x00_recv;

	eth_register(dev);

	return 1;
}

#endif /* CONFIG_AU1X00 */