Move MPC512x_FEC driver to drivers/net

Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

1 files changed, 794 insertions, 0 deletions

diff --git a/drivers/net/mpc512x_fec.c b/drivers/net/mpc512x_fec.c
new file mode 100644
index 0000000000..7caeeda653
--- /dev/null
+++ b/drivers/net/mpc512x_fec.c
@@ -0,0 +1,794 @@
+/*
+ * (C) Copyright 2003-2007
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * Derived from the MPC8xx FEC driver.
+ * Adapted for MPC512x by Grzegorz Bernacki <gjb@semihalf.com>
+ */
+
+#include <common.h>
+#include <mpc512x.h>
+#include <malloc.h>
+#include <net.h>
+#include <miiphy.h>
+#include "mpc512x_fec.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define DEBUG 0
+
+#if defined(CONFIG_CMD_NET) && defined(CONFIG_NET_MULTI) && \
+	defined(CONFIG_MPC512x_FEC)
+
+#if !(defined(CONFIG_MII) || defined(CONFIG_CMD_MII))
+#error "CONFIG_MII has to be defined!"
+#endif
+
+#if (DEBUG & 0x40)
+static uint32 local_crc32(char *string, unsigned int crc_value, int len);
+#endif
+
+int fec512x_miiphy_read(char *devname, uint8 phyAddr, uint8 regAddr, uint16 * retVal);
+int fec512x_miiphy_write(char *devname, uint8 phyAddr, uint8 regAddr, uint16 data);
+int mpc512x_fec_init_phy(struct eth_device *dev, bd_t * bis);
+
+static uchar rx_buff[FEC_BUFFER_SIZE];
+static int rx_buff_idx = 0;
+
+/********************************************************************/
+#if (DEBUG & 0x2)
+static void mpc512x_fec_phydump (char *devname)
+{
+	uint16 phyStatus, i;
+	uint8 phyAddr = CONFIG_PHY_ADDR;
+	uint8 reg_mask[] = {
+		/* regs to print: 0...8, 21,27,31 */
+		1, 1, 1, 1,  1, 1, 1, 1,     1, 0, 0, 0,  0, 0, 0, 0,
+		0, 0, 0, 0,  0, 1, 0, 0,     0, 0, 0, 1,  0, 0, 0, 1,
+	};
+
+	for (i = 0; i < 32; i++) {
+		if (reg_mask[i]) {
+			miiphy_read (devname, phyAddr, i, &phyStatus);
+			printf ("Mii reg %d: 0x%04x\n", i, phyStatus);
+		}
+	}
+}
+#endif
+
+/********************************************************************/
+static int mpc512x_fec_bd_init (mpc512x_fec_priv *fec)
+{
+	int ix;
+
+	/*
+	 * Receive BDs init
+	 */
+	for (ix = 0; ix < FEC_RBD_NUM; ix++) {
+		fec->bdBase->rbd[ix].dataPointer = (uint32)&fec->bdBase->recv_frames[ix];
+		fec->bdBase->rbd[ix].status = FEC_RBD_EMPTY;
+		fec->bdBase->rbd[ix].dataLength = 0;
+	}
+
+	/*
+	 * have the last RBD to close the ring
+	 */
+	fec->bdBase->rbd[ix - 1].status |= FEC_RBD_WRAP;
+	fec->rbdIndex = 0;
+
+	/*
+	 * Trasmit BDs init
+	 */
+	for (ix = 0; ix < FEC_TBD_NUM; ix++) {
+		fec->bdBase->tbd[ix].status = 0;
+	}
+
+	/*
+	 * Have the last TBD to close the ring
+	 */
+	fec->bdBase->tbd[ix - 1].status |= FEC_TBD_WRAP;
+
+	/*
+	 * Initialize some indices
+	 */
+	fec->tbdIndex = 0;
+	fec->usedTbdIndex = 0;
+	fec->cleanTbdNum = FEC_TBD_NUM;
+
+	return 0;
+}
+
+/********************************************************************/
+static void mpc512x_fec_rbd_clean (mpc512x_fec_priv *fec, volatile FEC_RBD * pRbd)
+{
+	/*
+	 * Reset buffer descriptor as empty
+	 */
+	if ((fec->rbdIndex) == (FEC_RBD_NUM - 1))
+		pRbd->status = (FEC_RBD_WRAP | FEC_RBD_EMPTY);
+	else
+		pRbd->status = FEC_RBD_EMPTY;
+
+	pRbd->dataLength = 0;
+
+	/*
+	 * Increment BD count
+	 */
+	fec->rbdIndex = (fec->rbdIndex + 1) % FEC_RBD_NUM;
+
+	/*
+	 * Now, we have an empty RxBD, notify FEC
+	 */
+	fec->eth->r_des_active = 0x01000000;	/* Descriptor polling active */
+}
+
+/********************************************************************/
+static void mpc512x_fec_tbd_scrub (mpc512x_fec_priv *fec)
+{
+	volatile FEC_TBD *pUsedTbd;
+
+#if (DEBUG & 0x1)
+	printf ("tbd_scrub: fec->cleanTbdNum = %d, fec->usedTbdIndex = %d\n",
+		fec->cleanTbdNum, fec->usedTbdIndex);
+#endif
+
+	/*
+	 * process all the consumed TBDs
+	 */
+	while (fec->cleanTbdNum < FEC_TBD_NUM) {
+		pUsedTbd = &fec->bdBase->tbd[fec->usedTbdIndex];
+		if (pUsedTbd->status & FEC_TBD_READY) {
+#if (DEBUG & 0x20)
+			printf ("Cannot clean TBD %d, in use\n", fec->usedTbdIndex);
+#endif
+			return;
+		}
+
+		/*
+		 * clean this buffer descriptor
+		 */
+		if (fec->usedTbdIndex == (FEC_TBD_NUM - 1))
+			pUsedTbd->status = FEC_TBD_WRAP;
+		else
+			pUsedTbd->status = 0;
+
+		/*
+		 * update some indeces for a correct handling of the TBD ring
+		 */
+		fec->cleanTbdNum++;
+		fec->usedTbdIndex = (fec->usedTbdIndex + 1) % FEC_TBD_NUM;
+	}
+}
+
+/********************************************************************/
+static void mpc512x_fec_set_hwaddr (mpc512x_fec_priv *fec, char *mac)
+{
+	uint8 currByte;			/* byte for which to compute the CRC */
+	int byte;			/* loop - counter */
+	int bit;			/* loop - counter */
+	uint32 crc = 0xffffffff;	/* initial value */
+
+	/*
+	 * The algorithm used is the following:
+	 * we loop on each of the six bytes of the provided address,
+	 * and we compute the CRC by left-shifting the previous
+	 * value by one position, so that each bit in the current
+	 * byte of the address may contribute the calculation. If
+	 * the latter and the MSB in the CRC are different, then
+	 * the CRC value so computed is also ex-ored with the
+	 * "polynomium generator". The current byte of the address
+	 * is also shifted right by one bit at each iteration.
+	 * This is because the CRC generatore in hardware is implemented
+	 * as a shift-register with as many ex-ores as the radixes
+	 * in the polynomium. This suggests that we represent the
+	 * polynomiumm itself as a 32-bit constant.
+	 */
+	for (byte = 0; byte < 6; byte++) {
+		currByte = mac[byte];
+		for (bit = 0; bit < 8; bit++) {
+			if ((currByte & 0x01) ^ (crc & 0x01)) {
+				crc >>= 1;
+				crc = crc ^ 0xedb88320;
+			} else {
+				crc >>= 1;
+			}
+			currByte >>= 1;
+		}
+	}
+
+	crc = crc >> 26;
+
+	/*
+	 * Set individual hash table register
+	 */
+	if (crc >= 32) {
+		fec->eth->iaddr1 = (1 << (crc - 32));
+		fec->eth->iaddr2 = 0;
+	} else {
+		fec->eth->iaddr1 = 0;
+		fec->eth->iaddr2 = (1 << crc);
+	}
+
+	/*
+	 * Set physical address
+	 */
+	fec->eth->paddr1 = (mac[0] << 24) + (mac[1] << 16) + (mac[2] << 8) + mac[3];
+	fec->eth->paddr2 = (mac[4] << 24) + (mac[5] << 16) + 0x8808;
+}
+
+/********************************************************************/
+static int mpc512x_fec_init (struct eth_device *dev, bd_t * bis)
+{
+	mpc512x_fec_priv *fec = (mpc512x_fec_priv *)dev->priv;
+
+#if (DEBUG & 0x1)
+	printf ("mpc512x_fec_init... Begin\n");
+#endif
+
+	/* Set interrupt mask register */
+	fec->eth->imask = 0x00000000;
+
+	/* Clear FEC-Lite interrupt event register(IEVENT) */
+	fec->eth->ievent = 0xffffffff;
+
+	/* Set transmit fifo watermark register(X_WMRK), default = 64 */
+	fec->eth->x_wmrk = 0x0;
+
+	/* Set Opcode/Pause Duration Register */
+	fec->eth->op_pause = 0x00010020;
+
+	/* Frame length=1522; MII mode */
+	fec->eth->r_cntrl = (FEC_MAX_FRAME_LEN << 16) | 0x24;
+
+	/* Half-duplex, heartbeat disabled */
+	fec->eth->x_cntrl = 0x00000000;
+
+	/* Enable MIB counters */
+	fec->eth->mib_control = 0x0;
+
+	/* Setup recv fifo start and buff size */
+	fec->eth->r_fstart = 0x500;
+	fec->eth->r_buff_size = FEC_BUFFER_SIZE;
+
+	/* Setup BD base addresses */
+	fec->eth->r_des_start = (uint32)fec->bdBase->rbd;
+	fec->eth->x_des_start = (uint32)fec->bdBase->tbd;
+
+	/* DMA Control */
+	fec->eth->dma_control = 0xc0000000;
+
+	/* Enable FEC */
+	fec->eth->ecntrl |= 0x00000006;
+
+	/* Initilize addresses and status words of BDs */
+	mpc512x_fec_bd_init (fec);
+
+	 /* Descriptor polling active */
+	fec->eth->r_des_active = 0x01000000;
+
+#if (DEBUG & 0x1)
+	printf("mpc512x_fec_init... Done \n");
+#endif
+	return 1;
+}
+
+/********************************************************************/
+int mpc512x_fec_init_phy (struct eth_device *dev, bd_t * bis)
+{
+	mpc512x_fec_priv *fec = (mpc512x_fec_priv *)dev->priv;
+	const uint8 phyAddr = CONFIG_PHY_ADDR;	/* Only one PHY */
+	int timeout = 1;
+	uint16 phyStatus;
+
+#if (DEBUG & 0x1)
+	printf ("mpc512x_fec_init_phy... Begin\n");
+#endif
+
+	/*
+	 * Clear FEC-Lite interrupt event register(IEVENT)
+	 */
+	fec->eth->ievent = 0xffffffff;
+
+	/*
+	 * Set interrupt mask register
+	 */
+	fec->eth->imask = 0x00000000;
+
+	if (fec->xcv_type != SEVENWIRE) {
+		/*
+		 * Set MII_SPEED = (1/(mii_speed * 2)) * System Clock
+		 * and do not drop the Preamble.
+		 */
+		fec->eth->mii_speed = (((gd->ips_clk / 1000000) / 5) + 1) << 1;
+
+		/*
+		 * Reset PHY, then delay 300ns
+		 */
+		miiphy_write (dev->name, phyAddr, 0x0, 0x8000);
+		udelay (1000);
+
+		if (fec->xcv_type == MII10) {
+		/*
+		 * Force 10Base-T, FDX operation
+		 */
+#if (DEBUG & 0x2)
+			printf ("Forcing 10 Mbps ethernet link... ");
+#endif
+			miiphy_read (dev->name, phyAddr, 0x1, &phyStatus);
+
+			miiphy_write (dev->name, phyAddr, 0x0, 0x0180);
+
+			timeout = 20;
+			do {    /* wait for link status to go down */
+				udelay (10000);
+				if ((timeout--) == 0) {
+#if (DEBUG & 0x2)
+					printf ("hmmm, should not have waited...");
+#endif
+					break;
+				}
+				miiphy_read (dev->name, phyAddr, 0x1, &phyStatus);
+#if (DEBUG & 0x2)
+				printf ("=");
+#endif
+			} while ((phyStatus & 0x0004)); /* !link up */
+
+			timeout = 1000;
+			do {    /* wait for link status to come back up */
+				udelay (10000);
+				if ((timeout--) == 0) {
+					printf ("failed. Link is down.\n");
+					break;
+				}
+				miiphy_read (dev->name, phyAddr, 0x1, &phyStatus);
+#if (DEBUG & 0x2)
+				printf ("+");
+#endif
+			} while (!(phyStatus & 0x0004)); /* !link up */
+
+#if (DEBUG & 0x2)
+			printf ("done.\n");
+#endif
+		} else {	/* MII100 */
+			/*
+			 * Set the auto-negotiation advertisement register bits
+			 */
+			miiphy_write (dev->name, phyAddr, 0x4, 0x01e1);
+
+			/*
+			 * Set MDIO bit 0.12 = 1(&& bit 0.9=1?) to enable auto-negotiation
+			 */
+			miiphy_write (dev->name, phyAddr, 0x0, 0x1200);
+
+			/*
+			 * Wait for AN completion
+			 */
+			timeout = 50000;
+			do {
+				udelay (1000);
+
+				if ((timeout--) == 0) {
+#if (DEBUG & 0x2)
+					printf ("PHY auto neg 0 failed...\n");
+#endif
+					return -1;
+				}
+
+				if (miiphy_read (dev->name, phyAddr, 0x1, &phyStatus) != 0) {
+#if (DEBUG & 0x2)
+					printf ("PHY auto neg 1 failed 0x%04x...\n", phyStatus);
+#endif
+					return -1;
+				}
+			} while (!(phyStatus & 0x0004));
+
+#if (DEBUG & 0x2)
+			printf ("PHY auto neg complete! \n");
+#endif
+		}
+	}
+
+#if (DEBUG & 0x2)
+	if (fec->xcv_type != SEVENWIRE)
+		mpc512x_fec_phydump (dev->name);
+#endif
+
+#if (DEBUG & 0x1)
+	printf ("mpc512x_fec_init_phy... Done \n");
+#endif
+	return 1;
+}
+
+/********************************************************************/
+static void mpc512x_fec_halt (struct eth_device *dev)
+{
+	mpc512x_fec_priv *fec = (mpc512x_fec_priv *)dev->priv;
+	int counter = 0xffff;
+
+#if (DEBUG & 0x2)
+	if (fec->xcv_type != SEVENWIRE)
+		mpc512x_fec_phydump (dev->name);
+#endif
+
+	/*
+	 * mask FEC chip interrupts
+	 */
+	fec->eth->imask = 0;
+
+	/*
+	 * issue graceful stop command to the FEC transmitter if necessary
+	 */
+	fec->eth->x_cntrl |= 0x00000001;
+
+	/*
+	 * wait for graceful stop to register
+	 */
+	while ((counter--) && (!(fec->eth->ievent & 0x10000000))) ;
+
+	/*
+	 * Disable the Ethernet Controller
+	 */
+	fec->eth->ecntrl &= 0xfffffffd;
+
+	/*
+	 * Issue a reset command to the FEC chip
+	 */
+	fec->eth->ecntrl |= 0x1;
+
+	/*
+	 * wait at least 16 clock cycles
+	 */
+	udelay (10);
+#if (DEBUG & 0x3)
+	printf ("Ethernet task stopped\n");
+#endif
+}
+
+/********************************************************************/
+
+static int mpc512x_fec_send (struct eth_device *dev, volatile void *eth_data,
+		int data_length)
+{
+	/*
+	 * This routine transmits one frame.  This routine only accepts
+	 * 6-byte Ethernet addresses.
+	 */
+	mpc512x_fec_priv *fec = (mpc512x_fec_priv *)dev->priv;
+	volatile FEC_TBD *pTbd;
+
+#if (DEBUG & 0x20)
+	printf("tbd status: 0x%04x\n", fec->tbdBase[fec->tbdIndex].status);
+#endif
+
+	/*
+	 * Clear Tx BD ring at first
+	 */
+	mpc512x_fec_tbd_scrub (fec);
+
+	/*
+	 * Check for valid length of data.
+	 */
+	if ((data_length > 1500) || (data_length <= 0)) {
+		return -1;
+	}
+
+	/*
+	 * Check the number of vacant TxBDs.
+	 */
+	if (fec->cleanTbdNum < 1) {
+#if (DEBUG & 0x20)
+		printf ("No available TxBDs ...\n");
+#endif
+		return -1;
+	}
+
+	/*
+	 * Get the first TxBD to send the mac header
+	 */
+	pTbd = &fec->bdBase->tbd[fec->tbdIndex];
+	pTbd->dataLength = data_length;
+	pTbd->dataPointer = (uint32)eth_data;
+	pTbd->status |= FEC_TBD_LAST | FEC_TBD_TC | FEC_TBD_READY;
+	fec->tbdIndex = (fec->tbdIndex + 1) % FEC_TBD_NUM;
+
+	/* Activate transmit Buffer Descriptor polling */
+	fec->eth->x_des_active = 0x01000000;	/* Descriptor polling active	*/
+
+#if (DEBUG & 0x8)
+	printf ( "+" );
+#endif
+
+	fec->cleanTbdNum -= 1;
+
+	/*
+	 * wait until frame is sent .
+	 */
+	while (pTbd->status & FEC_TBD_READY) {
+		udelay (10);
+#if (DEBUG & 0x8)
+		printf ("TDB status = %04x\n", pTbd->status);
+#endif
+	}
+
+	return 0;
+}
+
+
+/********************************************************************/
+static int mpc512x_fec_recv (struct eth_device *dev)
+{
+	/*
+	 * This command pulls one frame from the card
+	 */
+	mpc512x_fec_priv *fec = (mpc512x_fec_priv *)dev->priv;
+	volatile FEC_RBD *pRbd = &fec->bdBase->rbd[fec->rbdIndex];
+	unsigned long ievent;
+	int frame_length = 0;
+
+#if (DEBUG & 0x1)
+	printf ("mpc512x_fec_recv %d Start...\n", fec->rbdIndex);
+#endif
+#if (DEBUG & 0x8)
+	printf( "-" );
+#endif
+
+	/*
+	 * Check if any critical events have happened
+	 */
+	ievent = fec->eth->ievent;
+	fec->eth->ievent = ievent;
+	if (ievent & 0x20060000) {
+		/* BABT, Rx/Tx FIFO errors */
+		mpc512x_fec_halt (dev);
+		mpc512x_fec_init (dev, NULL);
+		return 0;
+	}
+	if (ievent & 0x80000000) {
+		/* Heartbeat error */
+		fec->eth->x_cntrl |= 0x00000001;
+	}
+	if (ievent & 0x10000000) {
+		/* Graceful stop complete */
+		if (fec->eth->x_cntrl & 0x00000001) {
+			mpc512x_fec_halt (dev);
+			fec->eth->x_cntrl &= ~0x00000001;
+			mpc512x_fec_init (dev, NULL);
+		}
+	}
+
+	if (!(pRbd->status & FEC_RBD_EMPTY)) {
+		if (!(pRbd->status & FEC_RBD_ERR) &&
+			((pRbd->dataLength - 4) > 14)) {
+
+			/*
+			 * Get buffer size
+			 */
+			if (pRbd->status & FEC_RBD_LAST)
+				frame_length = pRbd->dataLength - 4;
+			else
+				frame_length = pRbd->dataLength;
+#if (DEBUG & 0x20)
+			{
+				int i;
+				printf ("recv data length 0x%08x data hdr: ",
+					pRbd->dataLength);
+				for (i = 0; i < 14; i++)
+					printf ("%x ", *((uint8*)pRbd->dataPointer + i));
+				printf("\n");
+			}
+#endif
+			/*
+			 *  Fill the buffer and pass it to upper layers
+			 */
+			memcpy (&rx_buff[rx_buff_idx], (void*)pRbd->dataPointer,
+				frame_length - rx_buff_idx);
+			rx_buff_idx = frame_length;
+
+			if (pRbd->status & FEC_RBD_LAST) {
+				NetReceive ((uchar*)rx_buff, frame_length);
+				rx_buff_idx = 0;
+			}
+		}
+
+		/*
+		 * Reset buffer descriptor as empty
+		 */
+		mpc512x_fec_rbd_clean (fec, pRbd);
+	}
+
+	/* Try to fill Buffer Descriptors */
+	fec->eth->r_des_active = 0x01000000;	/* Descriptor polling active */
+	return frame_length;
+}
+
+/********************************************************************/
+int mpc512x_fec_initialize (bd_t * bis)
+{
+	mpc512x_fec_priv *fec;
+	struct eth_device *dev;
+	int i;
+	char *tmp, *end, env_enetaddr[6];
+	void * bd;
+
+	fec = (mpc512x_fec_priv *) malloc (sizeof(*fec));
+	dev = (struct eth_device *) malloc (sizeof(*dev));
+	memset (dev, 0, sizeof *dev);
+
+	fec->eth = (ethernet_regs *) MPC512X_FEC;
+
+# ifndef CONFIG_FEC_10MBIT
+	fec->xcv_type = MII100;
+# else
+	fec->xcv_type = MII10;
+# endif
+	dev->priv = (void *)fec;
+	dev->iobase = MPC512X_FEC;
+	dev->init = mpc512x_fec_init;
+	dev->halt = mpc512x_fec_halt;
+	dev->send = mpc512x_fec_send;
+	dev->recv = mpc512x_fec_recv;
+
+	sprintf (dev->name, "FEC ETHERNET");
+	eth_register (dev);
+
+#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
+	miiphy_register (dev->name,
+			fec512x_miiphy_read, fec512x_miiphy_write);
+#endif
+
+	/* Clean up space FEC's MIB and FIFO RAM ...*/
+	memset ((void *) MPC512X_FEC + 0x200, 0x00, 0x400);
+
+	/*
+	 * Malloc space for BDs  (must be quad word-aligned)
+	 * this pointer is lost, so cannot be freed
+	 */
+	bd = malloc (sizeof(mpc512x_buff_descs) + 0x1f);
+	fec->bdBase = (mpc512x_buff_descs*)((uint32)bd & 0xfffffff0);
+	memset ((void *) bd, 0x00, sizeof(mpc512x_buff_descs) + 0x1f);
+
+	/*
+	 * Set interrupt mask register
+	 */
+	fec->eth->imask = 0x00000000;
+
+	/*
+	 * Clear FEC-Lite interrupt event register(IEVENT)
+	 */
+	fec->eth->ievent = 0xffffffff;
+
+	/*
+	 * Try to set the mac address now. The fec mac address is
+	 * a garbage after reset. When not using fec for booting
+	 * the Linux fec driver will try to work with this garbage.
+	 */
+	tmp = getenv ("ethaddr");
+	if (tmp) {
+		for (i=0; i<6; i++) {
+			env_enetaddr[i] = tmp ? simple_strtoul (tmp, &end, 16) : 0;
+			if (tmp)
+				tmp = (*end) ? end+1 : end;
+		}
+		mpc512x_fec_set_hwaddr (fec, env_enetaddr);
+		fec->eth->gaddr1 = 0x00000000;
+		fec->eth->gaddr2 = 0x00000000;
+	}
+
+	mpc512x_fec_init_phy (dev, bis);
+
+	return 1;
+}
+
+/* MII-interface related functions */
+/********************************************************************/
+int fec512x_miiphy_read (char *devname, uint8 phyAddr, uint8 regAddr, uint16 * retVal)
+{
+	ethernet_regs *eth = (ethernet_regs *) MPC512X_FEC;
+	uint32 reg;		/* convenient holder for the PHY register */
+	uint32 phy;		/* convenient holder for the PHY */
+	int timeout = 0xffff;
+
+	/*
+	 * reading from any PHY's register is done by properly
+	 * programming the FEC's MII data register.
+	 */
+	reg = regAddr << FEC_MII_DATA_RA_SHIFT;
+	phy = phyAddr << FEC_MII_DATA_PA_SHIFT;
+
+	eth->mii_data = (FEC_MII_DATA_ST | FEC_MII_DATA_OP_RD | FEC_MII_DATA_TA | phy | reg);
+
+	/*
+	 * wait for the related interrupt
+	 */
+	while ((timeout--) && (!(eth->ievent & 0x00800000))) ;
+
+	if (timeout == 0) {
+#if (DEBUG & 0x2)
+		printf ("Read MDIO failed...\n");
+#endif
+		return -1;
+	}
+
+	/*
+	 * clear mii interrupt bit
+	 */
+	eth->ievent = 0x00800000;
+
+	/*
+	 * it's now safe to read the PHY's register
+	 */
+	*retVal = (uint16) eth->mii_data;
+
+	return 0;
+}
+
+/********************************************************************/
+int fec512x_miiphy_write (char *devname, uint8 phyAddr, uint8 regAddr, uint16 data)
+{
+	ethernet_regs *eth = (ethernet_regs *) MPC512X_FEC;
+	uint32 reg;		/* convenient holder for the PHY register */
+	uint32 phy;		/* convenient holder for the PHY */
+	int timeout = 0xffff;
+
+	reg = regAddr << FEC_MII_DATA_RA_SHIFT;
+	phy = phyAddr << FEC_MII_DATA_PA_SHIFT;
+
+	eth->mii_data = (FEC_MII_DATA_ST | FEC_MII_DATA_OP_WR |
+			FEC_MII_DATA_TA | phy | reg | data);
+
+	/*
+	 * wait for the MII interrupt
+	 */
+	while ((timeout--) && (!(eth->ievent & 0x00800000))) ;
+
+	if (timeout == 0) {
+#if (DEBUG & 0x2)
+		printf ("Write MDIO failed...\n");
+#endif
+		return -1;
+	}
+
+	/*
+	 * clear MII interrupt bit
+	 */
+	eth->ievent = 0x00800000;
+
+	return 0;
+}
+
+#if (DEBUG & 0x40)
+static uint32 local_crc32 (char *string, unsigned int crc_value, int len)
+{
+	int i;
+	char c;
+	unsigned int crc, count;
+
+	/*
+	 * crc32 algorithm
+	 */
+	/*
+	 * crc = 0xffffffff; * The initialized value should be 0xffffffff
+	 */
+	crc = crc_value;
+
+	for (i = len; --i >= 0;) {
+		c = *string++;
+		for (count = 0; count < 8; count++) {
+			if ((c & 0x01) ^ (crc & 0x01)) {
+				crc >>= 1;
+				crc = crc ^ 0xedb88320;
+			} else {
+				crc >>= 1;
+			}
+			c >>= 1;
+		}
+	}
+
+	/*
+	 * In big endian system, do byte swaping for crc value
+	 */
+	 /**/ return crc;
+}
+#endif	/* DEBUG */
+
+#endif /* CONFIG_MPC512x_FEC */