drivers/net/mpc8xx_fec.c

/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

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

#include <phy.h>

DECLARE_GLOBAL_DATA_PTR;

/* define WANT_MII when MII support is required */
#if defined(CONFIG_SYS_DISCOVER_PHY) || defined(CONFIG_FEC1_PHY) || defined(CONFIG_FEC2_PHY)
#define WANT_MII
#else
#undef WANT_MII
#endif

#if defined(WANT_MII)
#include <miiphy.h>

#if !(defined(CONFIG_MII) || defined(CONFIG_CMD_MII))
#error "CONFIG_MII has to be defined!"
#endif

#endif

#if defined(CONFIG_RMII) && !defined(WANT_MII)
#error RMII support is unusable without a working PHY.
#endif

#ifdef CONFIG_SYS_DISCOVER_PHY
static int mii_discover_phy(struct eth_device *dev);
#endif

int fec8xx_miiphy_read(struct mii_dev *bus, int addr, int devad, int reg);
int fec8xx_miiphy_write(struct mii_dev *bus, int addr, int devad, int reg,
			u16 value);

static struct ether_fcc_info_s
{
	int ether_index;
	int fecp_offset;
	int phy_addr;
	int actual_phy_addr;
	int initialized;
}
	ether_fcc_info[] = {
#if defined(CONFIG_ETHER_ON_FEC1)
	{
		0,
		offsetof(immap_t, im_cpm.cp_fec1),
		CONFIG_FEC1_PHY,
		-1,
		0,

	},
#endif
#if defined(CONFIG_ETHER_ON_FEC2)
	{
		1,
		offsetof(immap_t, im_cpm.cp_fec2),
		CONFIG_FEC2_PHY,
		-1,
		0,
	},
#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

#ifdef __GNUC__
static char txbuf[DBUF_LENGTH] __aligned(8);
#else
#error txbuf must be aligned.
#endif

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
  */

struct common_buf_desc {
	cbd_t rxbd[PKTBUFSRX];		/* Rx BD */
	cbd_t txbd[TX_BUF_CNT];		/* Tx BD */
};

static struct common_buf_desc __iomem *rtx;

static int fec_send(struct eth_device *dev, void *packet, int length);
static int fec_recv(struct eth_device *dev);
static int fec_init(struct eth_device *dev, bd_t *bd);
static void fec_halt(struct eth_device *dev);
#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
static void __mii_init(void);
#endif

int fec_initialize(bd_t *bis)
{
	struct eth_device *dev;
	struct ether_fcc_info_s *efis;
	int             i;

	for (i = 0; i < ARRAY_SIZE(ether_fcc_info); i++) {
		dev = malloc(sizeof(*dev));
		if (dev == NULL)
			hang();

		memset(dev, 0, sizeof(*dev));

		/* for FEC1 make sure that the name of the interface is the same
		   as the old one for compatibility reasons */
		if (i == 0)
			strcpy(dev->name, "FEC");
		else
			sprintf(dev->name, "FEC%d",
				ether_fcc_info[i].ether_index + 1);

		efis = &ether_fcc_info[i];

		/*
		 * reset actual phy addr
		 */
		efis->actual_phy_addr = -1;

		dev->priv = efis;
		dev->init = fec_init;
		dev->halt = fec_halt;
		dev->send = fec_send;
		dev->recv = fec_recv;

		eth_register(dev);

#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
		int retval;
		struct mii_dev *mdiodev = mdio_alloc();
		if (!mdiodev)
			return -ENOMEM;
		strncpy(mdiodev->name, dev->name, MDIO_NAME_LEN);
		mdiodev->read = fec8xx_miiphy_read;
		mdiodev->write = fec8xx_miiphy_write;

		retval = mdio_register(mdiodev);
		if (retval < 0)
			return retval;
#endif
	}
	return 1;
}

static int fec_send(struct eth_device *dev, void *packet, int length)
{
	int j, rc;
	struct ether_fcc_info_s *efis = dev->priv;
	fec_t __iomem *fecp =
			(fec_t __iomem *)(CONFIG_SYS_IMMR + efis->fecp_offset);

	/* section 16.9.23.3
	 * Wait for ready
	 */
	j = 0;
	while ((in_be16(&rtx->txbd[txIdx].cbd_sc) & BD_ENET_TX_READY) &&
	       (j < TOUT_LOOP)) {
		udelay(1);
		j++;
	}
	if (j >= TOUT_LOOP)
		printf("TX not ready\n");

	out_be32(&rtx->txbd[txIdx].cbd_bufaddr, (uint)packet);
	out_be16(&rtx->txbd[txIdx].cbd_datlen, length);
	setbits_be16(&rtx->txbd[txIdx].cbd_sc,
		     BD_ENET_TX_READY | BD_ENET_TX_LAST);

	/* Activate transmit Buffer Descriptor polling */
	/* Descriptor polling active	*/
	out_be32(&fecp->fec_x_des_active, 0x01000000);

	j = 0;
	while ((in_be16(&rtx->txbd[txIdx].cbd_sc) & BD_ENET_TX_READY) &&
	       (j < TOUT_LOOP)) {
		udelay(1);
		j++;
	}
	if (j >= TOUT_LOOP)
		printf("TX timeout\n");

	/* return only status bits */;
	rc = in_be16(&rtx->txbd[txIdx].cbd_sc) & BD_ENET_TX_STATS;

	txIdx = (txIdx + 1) % TX_BUF_CNT;

	return rc;
}

static int fec_recv(struct eth_device *dev)
{
	struct ether_fcc_info_s *efis = dev->priv;
	fec_t __iomem *fecp =
			(fec_t __iomem *)(CONFIG_SYS_IMMR + efis->fecp_offset);
	int length;

	for (;;) {
		/* section 16.9.23.2 */
		if (in_be16(&rtx->rxbd[rxIdx].cbd_sc) & BD_ENET_RX_EMPTY) {
			length = -1;
			break;	/* nothing received - leave for() loop */
		}

		length = in_be16(&rtx->rxbd[rxIdx].cbd_datlen);

		if (!(in_be16(&rtx->rxbd[rxIdx].cbd_sc) & 0x003f)) {
			uchar *rx = net_rx_packets[rxIdx];

			length -= 4;

#if defined(CONFIG_CMD_CDP)
			if ((rx[0] & 1) != 0 &&
			    memcmp((uchar *)rx, net_bcast_ethaddr, 6) != 0 &&
			    !is_cdp_packet((uchar *)rx))
				rx = NULL;
#endif
			/*
			 * Pass the packet up to the protocol layers.
			 */
			if (rx != NULL)
				net_process_received_packet(rx, length);
		}

		/* Give the buffer back to the FEC. */
		out_be16(&rtx->rxbd[rxIdx].cbd_datlen, 0);

		/* wrap around buffer index when necessary */
		if ((rxIdx + 1) >= PKTBUFSRX) {
			out_be16(&rtx->rxbd[PKTBUFSRX - 1].cbd_sc,
				 BD_ENET_RX_WRAP | BD_ENET_RX_EMPTY);
			rxIdx = 0;
		} else {
			out_be16(&rtx->rxbd[rxIdx].cbd_sc, BD_ENET_RX_EMPTY);
			rxIdx++;
		}

		/* Try to fill Buffer Descriptors */
		/* Descriptor polling active    */
		out_be32(&fecp->fec_r_des_active, 0x01000000);
	}

	return length;
}

/**************************************************************
 *
 * FEC Ethernet Initialization Routine
 *
 *************************************************************/

#define	FEC_ECNTRL_PINMUX	0x00000004
#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		50

#if defined(CONFIG_RMII)

static inline void fec_10Mbps(struct eth_device *dev)
{
	struct ether_fcc_info_s *efis = dev->priv;
	int fecidx = efis->ether_index;
	uint mask = (fecidx == 0) ? 0x0000010 : 0x0000008;
	immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;

	if ((unsigned int)fecidx >= 2)
		hang();

	setbits_be32(&immr->im_cpm.cp_cptr, mask);
}

static inline void fec_100Mbps(struct eth_device *dev)
{
	struct ether_fcc_info_s *efis = dev->priv;
	int fecidx = efis->ether_index;
	uint mask = (fecidx == 0) ? 0x0000010 : 0x0000008;
	immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;

	if ((unsigned int)fecidx >= 2)
		hang();

	clrbits_be32(&immr->im_cpm.cp_cptr, mask);
}

#endif

static inline void fec_full_duplex(struct eth_device *dev)
{
	struct ether_fcc_info_s *efis = dev->priv;
	fec_t __iomem *fecp =
			(fec_t __iomem *)(CONFIG_SYS_IMMR + efis->fecp_offset);

	clrbits_be32(&fecp->fec_r_cntrl, FEC_RCNTRL_DRT);
	setbits_be32(&fecp->fec_x_cntrl,  FEC_TCNTRL_FDEN);	/* FD enable */
}

static inline void fec_half_duplex(struct eth_device *dev)
{
	struct ether_fcc_info_s *efis = dev->priv;
	fec_t __iomem *fecp =
			(fec_t __iomem *)(CONFIG_SYS_IMMR + efis->fecp_offset);

	setbits_be32(&fecp->fec_r_cntrl, FEC_RCNTRL_DRT);
	clrbits_be32(&fecp->fec_x_cntrl,  FEC_TCNTRL_FDEN);	/* FD disable */
}

static void fec_pin_init(int fecidx)
{
	bd_t           *bd = gd->bd;
	immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;

	/*
	 * Set MII speed to 2.5 MHz or slightly below.
	 *
	 * According to the MPC860T (Rev. D) Fast ethernet controller user
	 * manual (6.2.14),
	 * the MII management interface clock must be less than or equal
	 * to 2.5 MHz.
	 * This MDC frequency is equal to system clock / (2 * MII_SPEED).
	 * Then MII_SPEED = system_clock / 2 * 2,5 MHz.
	 *
	 * All MII configuration is done via FEC1 registers:
	 */
	out_be32(&immr->im_cpm.cp_fec1.fec_mii_speed,
		 ((bd->bi_intfreq + 4999999) / 5000000) << 1);

#if defined(CONFIG_MPC885) && defined(WANT_MII)
	/* use MDC for MII */
	setbits_be16(&immr->im_ioport.iop_pdpar, 0x0080);
	clrbits_be16(&immr->im_ioport.iop_pddir, 0x0080);
#endif

	if (fecidx == 0) {
#if defined(CONFIG_ETHER_ON_FEC1)

#if defined(CONFIG_MPC885) /* MPC87x/88x have got 2 FECs and different pinout */

#if !defined(CONFIG_RMII)

		setbits_be16(&immr->im_ioport.iop_papar, 0xf830);
		setbits_be16(&immr->im_ioport.iop_padir, 0x0830);
		clrbits_be16(&immr->im_ioport.iop_padir, 0xf000);

		setbits_be32(&immr->im_cpm.cp_pbpar, 0x00001001);
		clrbits_be32(&immr->im_cpm.cp_pbdir, 0x00001001);

		setbits_be16(&immr->im_ioport.iop_pcpar, 0x000c);
		clrbits_be16(&immr->im_ioport.iop_pcdir, 0x000c);

		setbits_be32(&immr->im_cpm.cp_pepar, 0x00000003);
		setbits_be32(&immr->im_cpm.cp_pedir, 0x00000003);
		clrbits_be32(&immr->im_cpm.cp_peso, 0x00000003);

		clrbits_be32(&immr->im_cpm.cp_cptr, 0x00000100);

#else

#if !defined(CONFIG_FEC1_PHY_NORXERR)
		setbits_be16(&immr->im_ioport.iop_papar, 0x1000);
		clrbits_be16(&immr->im_ioport.iop_padir, 0x1000);
#endif
		setbits_be16(&immr->im_ioport.iop_papar, 0xe810);
		setbits_be16(&immr->im_ioport.iop_padir, 0x0810);
		clrbits_be16(&immr->im_ioport.iop_padir, 0xe000);

		setbits_be32(&immr->im_cpm.cp_pbpar, 0x00000001);
		clrbits_be32(&immr->im_cpm.cp_pbdir, 0x00000001);

		setbits_be32(&immr->im_cpm.cp_cptr, 0x00000100);
		clrbits_be32(&immr->im_cpm.cp_cptr, 0x00000050);

#endif /* !CONFIG_RMII */

#else
		/*
		 * Configure all of port D for MII.
		 */
		out_be16(&immr->im_ioport.iop_pdpar, 0x1fff);
		out_be16(&immr->im_ioport.iop_pddir, 0x1fff);

#if defined(CONFIG_TARGET_MCR3000)
		out_be16(&immr->im_ioport.iop_papar, 0xBBFF);
		out_be16(&immr->im_ioport.iop_padir, 0x04F0);
		out_be16(&immr->im_ioport.iop_paodr, 0x0000);

		out_be32(&immr->im_cpm.cp_pbpar, 0x000133FF);
		out_be32(&immr->im_cpm.cp_pbdir, 0x0003BF0F);
		out_be16(&immr->im_cpm.cp_pbodr, 0x0000);

		out_be16(&immr->im_ioport.iop_pcpar, 0x0400);
		out_be16(&immr->im_ioport.iop_pcdir, 0x0080);
		out_be16(&immr->im_ioport.iop_pcso , 0x0D53);
		out_be16(&immr->im_ioport.iop_pcint, 0x0000);

		out_be16(&immr->im_ioport.iop_pdpar, 0x03FE);
		out_be16(&immr->im_ioport.iop_pddir, 0x1C09);

		setbits_be32(&immr->im_ioport.utmode, 0x80);
#endif
#endif

#endif	/* CONFIG_ETHER_ON_FEC1 */
	} else if (fecidx == 1) {
#if defined(CONFIG_ETHER_ON_FEC2)

#if defined(CONFIG_MPC885) /* MPC87x/88x have got 2 FECs and different pinout */

#if !defined(CONFIG_RMII)
		setbits_be32(&immr->im_cpm.cp_pepar, 0x0003fffc);
		setbits_be32(&immr->im_cpm.cp_pedir, 0x0003fffc);
		clrbits_be32(&immr->im_cpm.cp_peso, 0x000087fc);
		setbits_be32(&immr->im_cpm.cp_peso, 0x00037800);

		clrbits_be32(&immr->im_cpm.cp_cptr, 0x00000080);
#else

#if !defined(CONFIG_FEC2_PHY_NORXERR)
		setbits_be32(&immr->im_cpm.cp_pepar, 0x00000010);
		setbits_be32(&immr->im_cpm.cp_pedir, 0x00000010);
		clrbits_be32(&immr->im_cpm.cp_peso, 0x00000010);
#endif
		setbits_be32(&immr->im_cpm.cp_pepar, 0x00039620);
		setbits_be32(&immr->im_cpm.cp_pedir, 0x00039620);
		setbits_be32(&immr->im_cpm.cp_peso, 0x00031000);
		clrbits_be32(&immr->im_cpm.cp_peso, 0x00008620);

		setbits_be32(&immr->im_cpm.cp_cptr, 0x00000080);
		clrbits_be32(&immr->im_cpm.cp_cptr, 0x00000028);
#endif /* CONFIG_RMII */

#endif /* CONFIG_MPC885 */

#endif /* CONFIG_ETHER_ON_FEC2 */
	}
}

static int fec_reset(fec_t __iomem *fecp)
{
	int i;

	/* 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.
	 */

	out_be32(&fecp->fec_ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_RESET);
	for (i = 0; (in_be32(&fecp->fec_ecntrl) & FEC_ECNTRL_RESET) &&
	     (i < FEC_RESET_DELAY); ++i)
		udelay(1);

	if (i == FEC_RESET_DELAY)
		return -1;

	return 0;
}

static int fec_init(struct eth_device *dev, bd_t *bd)
{
	struct ether_fcc_info_s *efis = dev->priv;
	immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;
	fec_t __iomem *fecp =
			(fec_t __iomem *)(CONFIG_SYS_IMMR + efis->fecp_offset);
	int i;

#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
	/* the MII interface is connected to FEC1
	 * so for the miiphy_xxx function to work we must
	 * call mii_init since fec_halt messes the thing up
	 */
	if (efis->ether_index != 0)
		__mii_init();
#endif

	if (fec_reset(fecp) < 0)
		printf("FEC_RESET_DELAY timeout\n");

	/* We use strictly polling mode only
	 */
	out_be32(&fecp->fec_imask, 0);

	/* Clear any pending interrupt
	 */
	out_be32(&fecp->fec_ievent, 0xffc0);

	/* No need to set the IVEC register */

	/* Set station address
	 */
#define ea dev->enetaddr
	out_be32(&fecp->fec_addr_low, (ea[0] << 24) | (ea[1] << 16) |
				      (ea[2] << 8) | ea[3]);
	out_be16(&fecp->fec_addr_high, (ea[4] << 8) | ea[5]);
#undef ea

#if defined(CONFIG_CMD_CDP)
	/*
	 * Turn on multicast address hash table
	 */
	out_be32(&fecp->fec_hash_table_high, 0xffffffff);
	out_be32(&fecp->fec_hash_table_low, 0xffffffff);
#else
	/* Clear multicast address hash table
	 */
	out_be32(&fecp->fec_hash_table_high, 0);
	out_be32(&fecp->fec_hash_table_low, 0);
#endif

	/* Set maximum receive buffer size.
	 */
	out_be32(&fecp->fec_r_buff_size, PKT_MAXBLR_SIZE);

	/* Set maximum frame length
	 */
	out_be32(&fecp->fec_r_hash, PKT_MAXBUF_SIZE);

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

	if (!rtx)
		rtx = (struct common_buf_desc __iomem *)
		      (immr->im_cpm.cp_dpmem + CPM_FEC_BASE);
	/*
	 * Setup Receiver Buffer Descriptors (13.14.24.18)
	 * Settings:
	 *     Empty, Wrap
	 */
	for (i = 0; i < PKTBUFSRX; i++) {
		out_be16(&rtx->rxbd[i].cbd_sc, BD_ENET_RX_EMPTY);
		out_be16(&rtx->rxbd[i].cbd_datlen, 0);	/* Reset */
		out_be32(&rtx->rxbd[i].cbd_bufaddr, (uint)net_rx_packets[i]);
	}
	setbits_be16(&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++) {
		out_be16(&rtx->txbd[i].cbd_sc, BD_ENET_TX_LAST | BD_ENET_TX_TC);
		out_be16(&rtx->txbd[i].cbd_datlen, 0);	/* Reset */
		out_be32(&rtx->txbd[i].cbd_bufaddr, (uint)txbuf);
	}
	setbits_be16(&rtx->txbd[TX_BUF_CNT - 1].cbd_sc, BD_ENET_TX_WRAP);

	/* Set receive and transmit descriptor base
	 */
	out_be32(&fecp->fec_r_des_start, (__force unsigned int)rtx->rxbd);
	out_be32(&fecp->fec_x_des_start, (__force unsigned int)rtx->txbd);

	/* Enable MII mode
	 */
	/* Half duplex mode */
	out_be32(&fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE | FEC_RCNTRL_DRT);
	out_be32(&fecp->fec_x_cntrl, 0);

	/* Enable big endian and don't care about SDMA FC.
	 */
	out_be32(&fecp->fec_fun_code, 0x78000000);

	/*
	 * Setup the pin configuration of the FEC
	 */
	fec_pin_init(efis->ether_index);

	rxIdx = 0;
	txIdx = 0;

	/*
	 * Now enable the transmit and receive processing
	 */
	out_be32(&fecp->fec_ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);

	if (efis->phy_addr == -1) {
#ifdef CONFIG_SYS_DISCOVER_PHY
		/*
		 * wait for the PHY to wake up after reset
		 */
		efis->actual_phy_addr = mii_discover_phy(dev);

		if (efis->actual_phy_addr == -1) {
			printf("Unable to discover phy!\n");
			return -1;
		}
#else
		efis->actual_phy_addr = -1;
#endif
	} else {
		efis->actual_phy_addr = efis->phy_addr;
	}

#if defined(CONFIG_MII) && defined(CONFIG_RMII)
	/*
	 * adapt the RMII speed to the speed of the phy
	 */
	if (miiphy_speed(dev->name, efis->actual_phy_addr) == _100BASET)
		fec_100Mbps(dev);
	else
		fec_10Mbps(dev);
#endif

#if defined(CONFIG_MII)
	/*
	 * adapt to the half/full speed settings
	 */
	if (miiphy_duplex(dev->name, efis->actual_phy_addr) == FULL)
		fec_full_duplex(dev);
	else
		fec_half_duplex(dev);
#endif

	/* And last, try to fill Rx Buffer Descriptors */
	/* Descriptor polling active    */
	out_be32(&fecp->fec_r_des_active, 0x01000000);

	efis->initialized = 1;

	return 0;
}


static void fec_halt(struct eth_device *dev)
{
	struct ether_fcc_info_s *efis = dev->priv;
	fec_t __iomem *fecp =
			(fec_t __iomem *)(CONFIG_SYS_IMMR + efis->fecp_offset);
	int i;

	/* avoid halt if initialized; mii gets stuck otherwise */
	if (!efis->initialized)
		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.
	 */

	out_be32(&fecp->fec_ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_RESET);
	for (i = 0; (in_be32(&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;
	}

	efis->initialized = 0;
}

#if defined(CONFIG_SYS_DISCOVER_PHY) || defined(CONFIG_MII) || defined(CONFIG_CMD_MII)

/* 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 */

/* send command to phy using mii, wait for result */
static uint
mii_send(uint mii_cmd)
{
	uint mii_reply;
	fec_t __iomem *ep;
	int cnt;
	immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;

	ep = &immr->im_cpm.cp_fec;

	out_be32(&ep->fec_mii_data, mii_cmd);	/* command to phy */

	/* wait for mii complete */
	cnt = 0;
	while (!(in_be32(&ep->fec_ievent) & FEC_ENET_MII)) {
		if (++cnt > 1000) {
			printf("mii_send STUCK!\n");
			break;
		}
	}
	mii_reply = in_be32(&ep->fec_mii_data);		/* result from phy */
	out_be32(&ep->fec_ievent, FEC_ENET_MII);	/* clear MII complete */
	return mii_reply & 0xffff;		/* data read from phy */
}
#endif

#if defined(CONFIG_SYS_DISCOVER_PHY)
static int mii_discover_phy(struct eth_device *dev)
{
#define MAX_PHY_PASSES 11
	uint phyno;
	int  pass;
	uint phytype;
	int phyaddr;

	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, MII_PHYSID2));
			if (phytype != 0xffff) {
				phyaddr = phyno;
				phytype |= mii_send(mk_mii_read(phyno,
								MII_PHYSID1)) << 16;
			}
		}
	}
	if (phyaddr < 0)
		printf("No PHY device found.\n");

	return phyaddr;
}
#endif	/* CONFIG_SYS_DISCOVER_PHY */

#if (defined(CONFIG_MII) || defined(CONFIG_CMD_MII)) && !defined(CONFIG_BITBANGMII)

/****************************************************************************
 * mii_init -- Initialize the MII via FEC 1 for MII command without ethernet
 * This function is a subset of eth_init
 ****************************************************************************
 */
static void __mii_init(void)
{
	immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;
	fec_t __iomem *fecp = &immr->im_cpm.cp_fec;

	if (fec_reset(fecp) < 0)
		printf("FEC_RESET_DELAY timeout\n");

	/* We use strictly polling mode only
	 */
	out_be32(&fecp->fec_imask, 0);

	/* Clear any pending interrupt
	 */
	out_be32(&fecp->fec_ievent, 0xffc0);

	/* Now enable the transmit and receive processing
	 */
	out_be32(&fecp->fec_ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
}

void mii_init(void)
{
	int i;

	__mii_init();

	/* Setup the pin configuration of the FEC(s)
	*/
	for (i = 0; i < ARRAY_SIZE(ether_fcc_info); i++)
		fec_pin_init(ether_fcc_info[i].ether_index);
}

/*****************************************************************************
 * 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 fec8xx_miiphy_read(struct mii_dev *bus, int addr, int devad, int reg)
{
	unsigned short value = 0;
	short rdreg;    /* register working value */

	rdreg = mii_send(mk_mii_read(addr, reg));

	value = rdreg;
	return value;
}

int fec8xx_miiphy_write(struct mii_dev *bus, int addr, int devad, int reg,
			u16 value)
{
	(void)mii_send(mk_mii_write(addr, reg, value));

	return 0;
}
#endif