/*
 * (C) Copyright 2000-2004
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * 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 <common.h>
#include <malloc.h>
#include <asm/fec.h>

#ifdef	CONFIG_M5272
#include <asm/m5272.h>
#include <asm/immap_5272.h>
#endif

#ifdef	CONFIG_M5282
#include <asm/m5282.h>
#include <asm/immap_5282.h>
#endif

#include <net.h>
#include <command.h>

#ifdef	CONFIG_M5272
#define FEC_ADDR		(CFG_MBAR + 0x840)
#endif
#ifdef CONFIG_M5282
#define FEC_ADDR 		(CFG_MBAR + 0x1000)
#endif

#undef	ET_DEBUG
#undef	MII_DEBUG

#if (CONFIG_COMMANDS & CFG_CMD_NET) && defined(FEC_ENET)

#ifdef CFG_DISCOVER_PHY
#include <miiphy.h>
static void mii_discover_phy (void);
#endif

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

#define TX_BUF_CNT 2

#define TOUT_LOOP 100

#define PKT_MAXBUF_SIZE		1518
#define PKT_MINBUF_SIZE		64
#define PKT_MAXBLR_SIZE		1520


static char txbuf[DBUF_LENGTH];

static uint rxIdx;		/* index of the current RX buffer */
static uint txIdx;		/* index of the current TX buffer */

/*
  * FEC Ethernet Tx and Rx buffer descriptors allocated at the
  *  immr->udata_bd address on Dual-Port RAM
  * Provide for Double Buffering
  */

typedef volatile struct CommonBufferDescriptor {
	cbd_t rxbd[PKTBUFSRX];	/* Rx BD */
	cbd_t txbd[TX_BUF_CNT];	/* Tx BD */
} RTXBD;

static RTXBD *rtx = NULL;

int eth_send (volatile void *packet, int length)
{
	int j, rc;
	volatile fec_t *fecp = (fec_t *) (FEC_ADDR);

	/* section 16.9.23.3
	 * Wait for ready
	 */
	j = 0;
	while ((rtx->txbd[txIdx].cbd_sc & BD_ENET_TX_READY)
	       && (j < TOUT_LOOP)) {
		udelay (1);
		j++;
	}
	if (j >= TOUT_LOOP) {
		printf ("TX not ready\n");
	}

	rtx->txbd[txIdx].cbd_bufaddr = (uint) packet;
	rtx->txbd[txIdx].cbd_datlen = length;
	rtx->txbd[txIdx].cbd_sc |= BD_ENET_TX_READY | BD_ENET_TX_LAST;

	/* Activate transmit Buffer Descriptor polling */
	fecp->fec_x_des_active = 0x01000000;	/* Descriptor polling active    */

	j = 0;
	while ((rtx->txbd[txIdx].cbd_sc & BD_ENET_TX_READY)
	       && (j < TOUT_LOOP)) {
		udelay (1);
		j++;
	}
	if (j >= TOUT_LOOP) {
		printf ("TX timeout\n");
	}
#ifdef ET_DEBUG
	printf ("%s[%d] %s: cycles: %d    status: %x  retry cnt: %d\n",
		__FILE__, __LINE__, __FUNCTION__, j, rtx->txbd[txIdx].cbd_sc,
		(rtx->txbd[txIdx].cbd_sc & 0x003C) >> 2);
#endif

	/* return only status bits */ ;
	rc = (rtx->txbd[txIdx].cbd_sc & BD_ENET_TX_STATS);

	txIdx = (txIdx + 1) % TX_BUF_CNT;

	return rc;
}

int eth_rx (void)
{
	int length;
	volatile fec_t *fecp = (fec_t *) FEC_ADDR;

	for (;;) {
		/* section 16.9.23.2 */
		if (rtx->rxbd[rxIdx].cbd_sc & BD_ENET_RX_EMPTY) {
			length = -1;
			break;	/* nothing received - leave for() loop */
		}

		length = rtx->rxbd[rxIdx].cbd_datlen;

		if (rtx->rxbd[rxIdx].cbd_sc & 0x003f) {
#ifdef ET_DEBUG
			printf ("%s[%d] err: %x\n",
				__FUNCTION__, __LINE__,
				rtx->rxbd[rxIdx].cbd_sc);
#endif
		} else {
			/* Pass the packet up to the protocol layers. */
			NetReceive (NetRxPackets[rxIdx], length - 4);
		}

		/* Give the buffer back to the FEC. */
		rtx->rxbd[rxIdx].cbd_datlen = 0;

		/* wrap around buffer index when necessary */
		if ((rxIdx + 1) >= PKTBUFSRX) {
			rtx->rxbd[PKTBUFSRX - 1].cbd_sc =
				(BD_ENET_RX_WRAP | BD_ENET_RX_EMPTY);
			rxIdx = 0;
		} else {
			rtx->rxbd[rxIdx].cbd_sc = BD_ENET_RX_EMPTY;
			rxIdx++;
		}

		/* Try to fill Buffer Descriptors */
		fecp->fec_r_des_active = 0x01000000;	/* Descriptor polling active    */
	}

	return length;
}

/**************************************************************
 *
 * FEC Ethernet Initialization Routine
 *
 *************************************************************/
#define FEC_ECNTRL_ETHER_EN	0x00000002
#define FEC_ECNTRL_RESET	0x00000001

#define FEC_RCNTRL_BC_REJ	0x00000010
#define FEC_RCNTRL_PROM		0x00000008
#define FEC_RCNTRL_MII_MODE	0x00000004
#define FEC_RCNTRL_DRT		0x00000002
#define FEC_RCNTRL_LOOP		0x00000001

#define FEC_TCNTRL_FDEN		0x00000004
#define FEC_TCNTRL_HBC		0x00000002
#define FEC_TCNTRL_GTS		0x00000001

#define	FEC_RESET_DELAY		50000

int eth_init (bd_t * bd)
{

	int i;
	volatile fec_t *fecp = (fec_t *) (FEC_ADDR);

	/* Whack a reset.
	 * A delay is required between a reset of the FEC block and
	 * initialization of other FEC registers because the reset takes
	 * some time to complete. If you don't delay, subsequent writes
	 * to FEC registers might get killed by the reset routine which is
	 * still in progress.
	 */
	fecp->fec_ecntrl = FEC_ECNTRL_RESET;
	for (i = 0;
	     (fecp->fec_ecntrl & FEC_ECNTRL_RESET) && (i < FEC_RESET_DELAY);
	     ++i) {
		udelay (1);
	}
	if (i == FEC_RESET_DELAY) {
		printf ("FEC_RESET_DELAY timeout\n");
		return 0;
	}

	/* We use strictly polling mode only
	 */
	fecp->fec_imask = 0;

	/* Clear any pending interrupt */
	fecp->fec_ievent = 0xffffffff;

	/* Set station address   */
#define ea bd->bi_enetaddr
	fecp->fec_addr_low = (ea[0] << 24) | (ea[1] << 16) |
		(ea[2] << 8) | (ea[3]);
	fecp->fec_addr_high = (ea[4] << 24) | (ea[5] << 16);
#ifdef ET_DEBUG
	printf ("Eth Addrs: %02x:%02x:%02x:%02x:%02x:%02x\n",
		ea[0], ea[1], ea[2], ea[3], ea[4], ea[5]);
#endif
#undef ea

	/* Clear multicast address hash table
	 */
	fecp->fec_hash_table_high = 0;
	fecp->fec_hash_table_low = 0;

	/* Set maximum receive buffer size.
	 */
	fecp->fec_r_buff_size = PKT_MAXBLR_SIZE;

	/*
	 * Setup Buffers and Buffer Desriptors
	 */
	rxIdx = 0;
	txIdx = 0;

	if (!rtx) {
		rtx = (RTXBD *) CFG_ENET_BD_BASE;
	}

	/*
	 * Setup Receiver Buffer Descriptors (13.14.24.18)
	 * Settings:
	 *     Empty, Wrap
	 */
	for (i = 0; i < PKTBUFSRX; i++) {
		rtx->rxbd[i].cbd_sc = BD_ENET_RX_EMPTY;
		rtx->rxbd[i].cbd_datlen = 0;	/* Reset */
		rtx->rxbd[i].cbd_bufaddr = (uint) NetRxPackets[i];
	}
	rtx->rxbd[PKTBUFSRX - 1].cbd_sc |= BD_ENET_RX_WRAP;

	/*
	 * Setup Ethernet Transmitter Buffer Descriptors (13.14.24.19)
	 * Settings:
	 *    Last, Tx CRC
	 */
	for (i = 0; i < TX_BUF_CNT; i++) {
		rtx->txbd[i].cbd_sc = BD_ENET_TX_LAST | BD_ENET_TX_TC;
		rtx->txbd[i].cbd_datlen = 0;	/* Reset */
		rtx->txbd[i].cbd_bufaddr = (uint) (&txbuf[0]);
	}
	rtx->txbd[TX_BUF_CNT - 1].cbd_sc |= BD_ENET_TX_WRAP;

	/* Set receive and transmit descriptor base
	 */
	fecp->fec_r_des_start = (unsigned int) (&rtx->rxbd[0]);
	fecp->fec_x_des_start = (unsigned int) (&rtx->txbd[0]);

	/* Enable MII mode
	 */
#if 0				/* Full duplex mode */
	fecp->fec_r_cntrl = FEC_RCNTRL_MII_MODE;
	fecp->fec_x_cntrl = FEC_TCNTRL_FDEN;
#else  /* Half duplex mode */
	fecp->fec_r_cntrl = FEC_RCNTRL_MII_MODE | FEC_RCNTRL_DRT;
	fecp->fec_x_cntrl = 0;
#endif
	/* Set MII speed */
	fecp->fec_mii_speed = 0x0e;

	/* Configure port B for MII.
	 */
	/* port initialization was already made in cpu_init_f() */

	/* Now enable the transmit and receive processing
	 */
	fecp->fec_ecntrl = FEC_ECNTRL_ETHER_EN;

#ifdef CFG_DISCOVER_PHY
	/* wait for the PHY to wake up after reset */
	mii_discover_phy ();
#endif

	/* And last, try to fill Rx Buffer Descriptors */
	fecp->fec_r_des_active = 0x01000000;	/* Descriptor polling active    */

	return 1;
}

void eth_halt (void)
{
	volatile fec_t *fecp = (fec_t *) FEC_ADDR;

	fecp->fec_ecntrl = 0;
}


#if defined(CFG_DISCOVER_PHY) || (CONFIG_COMMANDS & CFG_CMD_MII)

static int phyaddr = -1;	/* didn't find a PHY yet */
static uint phytype;

/* Make MII read/write commands for the FEC.
*/

#define mk_mii_read(ADDR, REG)	(0x60020000 | ((ADDR << 23) | \
						(REG & 0x1f) << 18))

#define mk_mii_write(ADDR, REG, VAL)	(0x50020000 | ((ADDR << 23) | \
						(REG & 0x1f) << 18) | \
						(VAL & 0xffff))

/* Interrupt events/masks.
*/
#define FEC_ENET_HBERR	((uint)0x80000000)	/* Heartbeat error */
#define FEC_ENET_BABR	((uint)0x40000000)	/* Babbling receiver */
#define FEC_ENET_BABT	((uint)0x20000000)	/* Babbling transmitter */
#define FEC_ENET_GRA	((uint)0x10000000)	/* Graceful stop complete */
#define FEC_ENET_TXF	((uint)0x08000000)	/* Full frame transmitted */
#define FEC_ENET_TXB	((uint)0x04000000)	/* A buffer was transmitted */
#define FEC_ENET_RXF	((uint)0x02000000)	/* Full frame received */
#define FEC_ENET_RXB	((uint)0x01000000)	/* A buffer was received */
#define FEC_ENET_MII	((uint)0x00800000)	/* MII interrupt */
#define FEC_ENET_EBERR	((uint)0x00400000)	/* SDMA bus error */

/* PHY identification
 */
#define PHY_ID_LXT970		0x78100000	/* LXT970 */
#define PHY_ID_LXT971		0x001378e0	/* LXT971 and 972 */
#define PHY_ID_82555		0x02a80150	/* Intel 82555 */
#define PHY_ID_QS6612		0x01814400	/* QS6612 */
#define PHY_ID_AMD79C784	0x00225610	/* AMD 79C784 */
#define PHY_ID_LSI80225		0x0016f870	/* LSI 80225 */
#define PHY_ID_LSI80225B	0x0016f880	/* LSI 80225/B */

/* send command to phy using mii, wait for result */
static uint mii_send (uint mii_cmd)
{
	uint mii_reply;
	volatile fec_t *ep = (fec_t *) (FEC_ADDR);

	ep->fec_mii_data = mii_cmd;	/* command to phy */

	/* wait for mii complete */
	while (!(ep->fec_ievent & FEC_ENET_MII));	/* spin until done */
	mii_reply = ep->fec_mii_data;	/* result from phy */
	ep->fec_ievent = FEC_ENET_MII;	/* clear MII complete */
#ifdef ET_DEBUG
	printf ("%s[%d] %s: sent=0x%8.8x, reply=0x%8.8x\n",
		__FILE__, __LINE__, __FUNCTION__, mii_cmd, mii_reply);
#endif
	return (mii_reply & 0xffff);	/* data read from phy */
}
#endif /* CFG_DISCOVER_PHY || (CONFIG_COMMANDS & CFG_CMD_MII) */

#if defined(CFG_DISCOVER_PHY)
static void mii_discover_phy (void)
{
#define MAX_PHY_PASSES 11
	uint phyno;
	int pass;

	phyaddr = -1;		/* didn't find a PHY yet */
	for (pass = 1; pass <= MAX_PHY_PASSES && phyaddr < 0; ++pass) {
		if (pass > 1) {
			/* PHY may need more time to recover from reset.
			 * The LXT970 needs 50ms typical, no maximum is
			 * specified, so wait 10ms before try again.
			 * With 11 passes this gives it 100ms to wake up.
			 */
			udelay (10000);	/* wait 10ms */
		}
		for (phyno = 0; phyno < 32 && phyaddr < 0; ++phyno) {
			phytype = mii_send (mk_mii_read (phyno, PHY_PHYIDR1));
#ifdef ET_DEBUG
			printf ("PHY type 0x%x pass %d type ", phytype, pass);
#endif
			if (phytype != 0xffff) {
				phyaddr = phyno;
				phytype <<= 16;
				phytype |= mii_send (mk_mii_read (phyno,
								  PHY_PHYIDR2));

#ifdef ET_DEBUG
				printf ("PHY @ 0x%x pass %d type ", phyno,
					pass);
				switch (phytype & 0xfffffff0) {
				case PHY_ID_LXT970:
					printf ("LXT970\n");
					break;
				case PHY_ID_LXT971:
					printf ("LXT971\n");
					break;
				case PHY_ID_82555:
					printf ("82555\n");
					break;
				case PHY_ID_QS6612:
					printf ("QS6612\n");
					break;
				case PHY_ID_AMD79C784:
					printf ("AMD79C784\n");
					break;
				case PHY_ID_LSI80225B:
					printf ("LSI L80225/B\n");
					break;
				default:
					printf ("0x%08x\n", phytype);
					break;
				}
#endif
			}
		}
	}
	if (phyaddr < 0) {
		printf ("No PHY device found.\n");
	}
}
#endif /* CFG_DISCOVER_PHY */

#if (CONFIG_COMMANDS & CFG_CMD_MII) && !defined(CONFIG_BITBANGMII)

static int mii_init_done = 0;

/****************************************************************************
 * mii_init -- Initialize the MII for MII command without ethernet
 * This function is a subset of eth_init
 ****************************************************************************
 */
void mii_init (void)
{
	volatile fec_t *fecp = (fec_t *) (FEC_ADDR);

	int i;

	if (mii_init_done != 0) {
		return;
	}

	/* Whack a reset.
	 * A delay is required between a reset of the FEC block and
	 * initialization of other FEC registers because the reset takes
	 * some time to complete. If you don't delay, subsequent writes
	 * to FEC registers might get killed by the reset routine which is
	 * still in progress.
	 */

	fecp->fec_ecntrl = FEC_ECNTRL_RESET;
	for (i = 0;
	     (fecp->fec_ecntrl & FEC_ECNTRL_RESET) && (i < FEC_RESET_DELAY);
	     ++i) {
		udelay (1);
	}
	if (i == FEC_RESET_DELAY) {
		printf ("FEC_RESET_DELAY timeout\n");
		return;
	}

	/* We use strictly polling mode only
	 */
	fecp->fec_imask = 0;

	/* Clear any pending interrupt
	 */
	fecp->fec_ievent = 0xffffffff;

	/* Set MII speed */
	fecp->fec_mii_speed = 0x0e;

	/* Configure port B for MII.
	 */
	/* port initialization was already made in cpu_init_f() */

	/* Now enable the transmit and receive processing */
	fecp->fec_ecntrl = FEC_ECNTRL_ETHER_EN;

	mii_init_done = 1;
}

/*****************************************************************************
 * Read and write a MII PHY register, routines used by MII Utilities
 *
 * FIXME: These routines are expected to return 0 on success, but mii_send
 *	  does _not_ return an error code. Maybe 0xFFFF means error, i.e.
 *	  no PHY connected...
 *	  For now always return 0.
 * FIXME: These routines only work after calling eth_init() at least once!
 *	  Otherwise they hang in mii_send() !!! Sorry!
 *****************************************************************************/

int miiphy_read (unsigned char addr, unsigned char reg, unsigned short *value)
{
	short rdreg;		/* register working value */

#ifdef MII_DEBUG
	printf ("miiphy_read(0x%x) @ 0x%x = ", reg, addr);
#endif
	rdreg = mii_send (mk_mii_read (addr, reg));

	*value = rdreg;

#ifdef MII_DEBUG
	printf ("0x%04x\n", *value);
#endif

	return 0;
}

int miiphy_write (unsigned char addr, unsigned char reg, unsigned short value)
{
	short rdreg;		/* register working value */

#ifdef MII_DEBUG
	printf ("miiphy_write(0x%x) @ 0x%x = ", reg, addr);
#endif

	rdreg = mii_send (mk_mii_write (addr, reg, value));

#ifdef MII_DEBUG
	printf ("0x%04x\n", value);
#endif

	return 0;
}
#endif /* (CONFIG_COMMANDS & CFG_CMD_MII) && !defined(CONFIG_BITBANGMII) */

#endif /* CFG_CMD_NET, FEC_ENET */