drivers/net/designware.c - github/trini/u-boot - Gitiles

 /*
  * (C) Copyright 2010
  * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 /*
  * Designware ethernet IP driver for u-boot
  */

 #include <common.h>
 #include <miiphy.h>
 #include <malloc.h>
 #include <linux/compiler.h>
 #include <linux/err.h>
 #include <asm/io.h>
 #include "designware.h"

 #if !defined(CONFIG_PHYLIB)
 # error "DesignWare Ether MAC requires PHYLIB - missing CONFIG_PHYLIB"
 #endif

 static int dw_mdio_read(struct mii_dev *bus, int addr, int devad, int reg)
 {
 	struct eth_mac_regs *mac_p = bus->priv;
 	ulong start;
 	u16 miiaddr;
 	int timeout = CONFIG_MDIO_TIMEOUT;

 	miiaddr = ((addr << MIIADDRSHIFT) & MII_ADDRMSK) |
 		  ((reg << MIIREGSHIFT) & MII_REGMSK);

 	writel(miiaddr | MII_CLKRANGE_150_250M | MII_BUSY, &mac_p->miiaddr);

 	start = get_timer(0);
 	while (get_timer(start) < timeout) {
 		if (!(readl(&mac_p->miiaddr) & MII_BUSY))
 			return readl(&mac_p->miidata);
 		udelay(10);
 	};

 	return -1;
 }

 static int dw_mdio_write(struct mii_dev *bus, int addr, int devad, int reg,
 			u16 val)
 {
 	struct eth_mac_regs *mac_p = bus->priv;
 	ulong start;
 	u16 miiaddr;
 	int ret = -1, timeout = CONFIG_MDIO_TIMEOUT;

 	writel(val, &mac_p->miidata);
 	miiaddr = ((addr << MIIADDRSHIFT) & MII_ADDRMSK) |
 		  ((reg << MIIREGSHIFT) & MII_REGMSK) | MII_WRITE;

 	writel(miiaddr | MII_CLKRANGE_150_250M | MII_BUSY, &mac_p->miiaddr);

 	start = get_timer(0);
 	while (get_timer(start) < timeout) {
 		if (!(readl(&mac_p->miiaddr) & MII_BUSY)) {
 			ret = 0;
 			break;
 		}
 		udelay(10);
 	};

 	return ret;
 }

 static int dw_mdio_init(char *name, struct eth_mac_regs *mac_regs_p)
 {
 	struct mii_dev *bus = mdio_alloc();

 	if (!bus) {
 		printf("Failed to allocate MDIO bus\n");
 		return -1;
 	}

 	bus->read = dw_mdio_read;
 	bus->write = dw_mdio_write;
 	sprintf(bus->name, name);

 	bus->priv = (void *)mac_regs_p;

 	return mdio_register(bus);
 }

 static void tx_descs_init(struct eth_device *dev)
 {
 	struct dw_eth_dev *priv = dev->priv;
 	struct eth_dma_regs *dma_p = priv->dma_regs_p;
 	struct dmamacdescr *desc_table_p = &priv->tx_mac_descrtable[0];
 	char *txbuffs = &priv->txbuffs[0];
 	struct dmamacdescr *desc_p;
 	u32 idx;

 	for (idx = 0; idx < CONFIG_TX_DESCR_NUM; idx++) {
 		desc_p = &desc_table_p[idx];
 		desc_p->dmamac_addr = &txbuffs[idx * CONFIG_ETH_BUFSIZE];
 		desc_p->dmamac_next = &desc_table_p[idx + 1];

 #if defined(CONFIG_DW_ALTDESCRIPTOR)
 		desc_p->txrx_status &= ~(DESC_TXSTS_TXINT | DESC_TXSTS_TXLAST |
 				DESC_TXSTS_TXFIRST | DESC_TXSTS_TXCRCDIS | \
 				DESC_TXSTS_TXCHECKINSCTRL | \
 				DESC_TXSTS_TXRINGEND | DESC_TXSTS_TXPADDIS);

 		desc_p->txrx_status |= DESC_TXSTS_TXCHAIN;
 		desc_p->dmamac_cntl = 0;
 		desc_p->txrx_status &= ~(DESC_TXSTS_MSK | DESC_TXSTS_OWNBYDMA);
 #else
 		desc_p->dmamac_cntl = DESC_TXCTRL_TXCHAIN;
 		desc_p->txrx_status = 0;
 #endif
 	}

 	/* Correcting the last pointer of the chain */
 	desc_p->dmamac_next = &desc_table_p[0];

 	/* Flush all Tx buffer descriptors at once */
 	flush_dcache_range((unsigned int)priv->tx_mac_descrtable,
 			   (unsigned int)priv->tx_mac_descrtable +
 			   sizeof(priv->tx_mac_descrtable));

 	writel((ulong)&desc_table_p[0], &dma_p->txdesclistaddr);
 	priv->tx_currdescnum = 0;
 }

 static void rx_descs_init(struct eth_device *dev)
 {
 	struct dw_eth_dev *priv = dev->priv;
 	struct eth_dma_regs *dma_p = priv->dma_regs_p;
 	struct dmamacdescr *desc_table_p = &priv->rx_mac_descrtable[0];
 	char *rxbuffs = &priv->rxbuffs[0];
 	struct dmamacdescr *desc_p;
 	u32 idx;

 	/* Before passing buffers to GMAC we need to make sure zeros
 	 * written there right after "priv" structure allocation were
 	 * flushed into RAM.
 	 * Otherwise there's a chance to get some of them flushed in RAM when
 	 * GMAC is already pushing data to RAM via DMA. This way incoming from
 	 * GMAC data will be corrupted. */
 	flush_dcache_range((unsigned int)rxbuffs, (unsigned int)rxbuffs +
 			   RX_TOTAL_BUFSIZE);

 	for (idx = 0; idx < CONFIG_RX_DESCR_NUM; idx++) {
 		desc_p = &desc_table_p[idx];
 		desc_p->dmamac_addr = &rxbuffs[idx * CONFIG_ETH_BUFSIZE];
 		desc_p->dmamac_next = &desc_table_p[idx + 1];

 		desc_p->dmamac_cntl =
 			(MAC_MAX_FRAME_SZ & DESC_RXCTRL_SIZE1MASK) | \
 				      DESC_RXCTRL_RXCHAIN;

 		desc_p->txrx_status = DESC_RXSTS_OWNBYDMA;
 	}

 	/* Correcting the last pointer of the chain */
 	desc_p->dmamac_next = &desc_table_p[0];

 	/* Flush all Rx buffer descriptors at once */
 	flush_dcache_range((unsigned int)priv->rx_mac_descrtable,
 			   (unsigned int)priv->rx_mac_descrtable +
 			   sizeof(priv->rx_mac_descrtable));

 	writel((ulong)&desc_table_p[0], &dma_p->rxdesclistaddr);
 	priv->rx_currdescnum = 0;
 }

 static int dw_write_hwaddr(struct eth_device *dev)
 {
 	struct dw_eth_dev *priv = dev->priv;
 	struct eth_mac_regs *mac_p = priv->mac_regs_p;
 	u32 macid_lo, macid_hi;
 	u8 *mac_id = &dev->enetaddr[0];

 	macid_lo = mac_id[0] + (mac_id[1] << 8) + (mac_id[2] << 16) +
 		   (mac_id[3] << 24);
 	macid_hi = mac_id[4] + (mac_id[5] << 8);

 	writel(macid_hi, &mac_p->macaddr0hi);
 	writel(macid_lo, &mac_p->macaddr0lo);

 	return 0;
 }

 static void dw_adjust_link(struct eth_mac_regs *mac_p,
 			   struct phy_device *phydev)
 {
 	u32 conf = readl(&mac_p->conf) | FRAMEBURSTENABLE | DISABLERXOWN;

 	if (!phydev->link) {
 		printf("%s: No link.\n", phydev->dev->name);
 		return;
 	}

 	if (phydev->speed != 1000)
 		conf |= MII_PORTSELECT;

 	if (phydev->speed == 100)
 		conf |= FES_100;

 	if (phydev->duplex)
 		conf |= FULLDPLXMODE;

 	writel(conf, &mac_p->conf);

 	printf("Speed: %d, %s duplex%s\n", phydev->speed,
 	       (phydev->duplex) ? "full" : "half",
 	       (phydev->port == PORT_FIBRE) ? ", fiber mode" : "");
 }

 static void dw_eth_halt(struct eth_device *dev)
 {
 	struct dw_eth_dev *priv = dev->priv;
 	struct eth_mac_regs *mac_p = priv->mac_regs_p;
 	struct eth_dma_regs *dma_p = priv->dma_regs_p;

 	writel(readl(&mac_p->conf) & ~(RXENABLE | TXENABLE), &mac_p->conf);
 	writel(readl(&dma_p->opmode) & ~(RXSTART | TXSTART), &dma_p->opmode);

 	phy_shutdown(priv->phydev);
 }

 static int dw_eth_init(struct eth_device *dev, bd_t *bis)
 {
 	struct dw_eth_dev *priv = dev->priv;
 	struct eth_mac_regs *mac_p = priv->mac_regs_p;
 	struct eth_dma_regs *dma_p = priv->dma_regs_p;
 	unsigned int start;

 	writel(readl(&dma_p->busmode) | DMAMAC_SRST, &dma_p->busmode);

 	start = get_timer(0);
 	while (readl(&dma_p->busmode) & DMAMAC_SRST) {
 		if (get_timer(start) >= CONFIG_MACRESET_TIMEOUT)
 			return -1;

 		mdelay(100);
 	};

 	/* Soft reset above clears HW address registers.
 	 * So we have to set it here once again */
 	dw_write_hwaddr(dev);

 	rx_descs_init(dev);
 	tx_descs_init(dev);

 	writel(FIXEDBURST | PRIORXTX_41 | BURST_16, &dma_p->busmode);

 	writel(readl(&dma_p->opmode) | FLUSHTXFIFO | STOREFORWARD,
 	       &dma_p->opmode);

 	writel(readl(&dma_p->opmode) | RXSTART | TXSTART, &dma_p->opmode);

 	/* Start up the PHY */
 	if (phy_startup(priv->phydev)) {
 		printf("Could not initialize PHY %s\n",
 		       priv->phydev->dev->name);
 		return -1;
 	}

 	dw_adjust_link(mac_p, priv->phydev);

 	if (!priv->phydev->link)
 		return -1;

 	writel(readl(&mac_p->conf) | RXENABLE | TXENABLE, &mac_p->conf);

 	return 0;
 }

 static int dw_eth_send(struct eth_device *dev, void *packet, int length)
 {
 	struct dw_eth_dev *priv = dev->priv;
 	struct eth_dma_regs *dma_p = priv->dma_regs_p;
 	u32 desc_num = priv->tx_currdescnum;
 	struct dmamacdescr *desc_p = &priv->tx_mac_descrtable[desc_num];

 	/* Invalidate only "status" field for the following check */
 	invalidate_dcache_range((unsigned long)&desc_p->txrx_status,
 				(unsigned long)&desc_p->txrx_status +
 				sizeof(desc_p->txrx_status));

 	/* Check if the descriptor is owned by CPU */
 	if (desc_p->txrx_status & DESC_TXSTS_OWNBYDMA) {
 		printf("CPU not owner of tx frame\n");
 		return -1;
 	}

 	memcpy((void *)desc_p->dmamac_addr, packet, length);

 	/* Flush data to be sent */
 	flush_dcache_range((unsigned long)desc_p->dmamac_addr,
 			   (unsigned long)desc_p->dmamac_addr + length);

 #if defined(CONFIG_DW_ALTDESCRIPTOR)
 	desc_p->txrx_status |= DESC_TXSTS_TXFIRST | DESC_TXSTS_TXLAST;
 	desc_p->dmamac_cntl |= (length << DESC_TXCTRL_SIZE1SHFT) & \
 			       DESC_TXCTRL_SIZE1MASK;

 	desc_p->txrx_status &= ~(DESC_TXSTS_MSK);
 	desc_p->txrx_status |= DESC_TXSTS_OWNBYDMA;
 #else
 	desc_p->dmamac_cntl |= ((length << DESC_TXCTRL_SIZE1SHFT) & \
 			       DESC_TXCTRL_SIZE1MASK) | DESC_TXCTRL_TXLAST | \
 			       DESC_TXCTRL_TXFIRST;

 	desc_p->txrx_status = DESC_TXSTS_OWNBYDMA;
 #endif

 	/* Flush modified buffer descriptor */
 	flush_dcache_range((unsigned long)desc_p,
 			   (unsigned long)desc_p + sizeof(struct dmamacdescr));

 	/* Test the wrap-around condition. */
 	if (++desc_num >= CONFIG_TX_DESCR_NUM)
 		desc_num = 0;

 	priv->tx_currdescnum = desc_num;

 	/* Start the transmission */
 	writel(POLL_DATA, &dma_p->txpolldemand);

 	return 0;
 }

 static int dw_eth_recv(struct eth_device *dev)
 {
 	struct dw_eth_dev *priv = dev->priv;
 	u32 status, desc_num = priv->rx_currdescnum;
 	struct dmamacdescr *desc_p = &priv->rx_mac_descrtable[desc_num];
 	int length = 0;

 	/* Invalidate entire buffer descriptor */
 	invalidate_dcache_range((unsigned long)desc_p,
 				(unsigned long)desc_p +
 				sizeof(struct dmamacdescr));

 	status = desc_p->txrx_status;

 	/* Check  if the owner is the CPU */
 	if (!(status & DESC_RXSTS_OWNBYDMA)) {

 		length = (status & DESC_RXSTS_FRMLENMSK) >> \
 			 DESC_RXSTS_FRMLENSHFT;

 		/* Invalidate received data */
 		invalidate_dcache_range((unsigned long)desc_p->dmamac_addr,
 					(unsigned long)desc_p->dmamac_addr +
 					length);

 		NetReceive(desc_p->dmamac_addr, length);

 		/*
 		 * Make the current descriptor valid again and go to
 		 * the next one
 		 */
 		desc_p->txrx_status |= DESC_RXSTS_OWNBYDMA;

 		/* Flush only status field - others weren't changed */
 		flush_dcache_range((unsigned long)&desc_p->txrx_status,
 				   (unsigned long)&desc_p->txrx_status +
 				   sizeof(desc_p->txrx_status));

 		/* Test the wrap-around condition. */
 		if (++desc_num >= CONFIG_RX_DESCR_NUM)
 			desc_num = 0;
 	}

 	priv->rx_currdescnum = desc_num;

 	return length;
 }

 static int dw_phy_init(struct eth_device *dev)
 {
 	struct dw_eth_dev *priv = dev->priv;
 	struct phy_device *phydev;
 	int mask = 0xffffffff;

 #ifdef CONFIG_PHY_ADDR
 	mask = 1 << CONFIG_PHY_ADDR;
 #endif

 	phydev = phy_find_by_mask(priv->bus, mask, priv->interface);
 	if (!phydev)
 		return -1;

 	phydev->supported &= PHY_GBIT_FEATURES;
 	phydev->advertising = phydev->supported;

 	priv->phydev = phydev;
 	phy_config(phydev);

 	return 1;
 }

 int designware_initialize(ulong base_addr, u32 interface)
 {
 	struct eth_device *dev;
 	struct dw_eth_dev *priv;

 	dev = (struct eth_device *) malloc(sizeof(struct eth_device));
 	if (!dev)
 		return -ENOMEM;

 	/*
 	 * Since the priv structure contains the descriptors which need a strict
 	 * buswidth alignment, memalign is used to allocate memory
 	 */
 	priv = (struct dw_eth_dev *) memalign(16, sizeof(struct dw_eth_dev));
 	if (!priv) {
 		free(dev);
 		return -ENOMEM;
 	}

 	memset(dev, 0, sizeof(struct eth_device));
 	memset(priv, 0, sizeof(struct dw_eth_dev));

 	sprintf(dev->name, "dwmac.%lx", base_addr);
 	dev->iobase = (int)base_addr;
 	dev->priv = priv;

 	priv->dev = dev;
 	priv->mac_regs_p = (struct eth_mac_regs *)base_addr;
 	priv->dma_regs_p = (struct eth_dma_regs *)(base_addr +
 			DW_DMA_BASE_OFFSET);

 	dev->init = dw_eth_init;
 	dev->send = dw_eth_send;
 	dev->recv = dw_eth_recv;
 	dev->halt = dw_eth_halt;
 	dev->write_hwaddr = dw_write_hwaddr;

 	eth_register(dev);

 	priv->interface = interface;

 	dw_mdio_init(dev->name, priv->mac_regs_p);
 	priv->bus = miiphy_get_dev_by_name(dev->name);

 	return dw_phy_init(dev);
 }
	/*
	* (C) Copyright 2010
	* Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	/*
	* Designware ethernet IP driver for u-boot
	*/

	#include <common.h>
	#include <miiphy.h>
	#include <malloc.h>
	#include <linux/compiler.h>
	#include <linux/err.h>
	#include <asm/io.h>
	#include "designware.h"

	#if !defined(CONFIG_PHYLIB)
	# error "DesignWare Ether MAC requires PHYLIB - missing CONFIG_PHYLIB"
	#endif

	static int dw_mdio_read(struct mii_dev *bus, int addr, int devad, int reg)
	{
	struct eth_mac_regs *mac_p = bus->priv;
	ulong start;
	u16 miiaddr;
	int timeout = CONFIG_MDIO_TIMEOUT;

	miiaddr = ((addr << MIIADDRSHIFT) & MII_ADDRMSK) \|
	((reg << MIIREGSHIFT) & MII_REGMSK);

	writel(miiaddr \| MII_CLKRANGE_150_250M \| MII_BUSY, &mac_p->miiaddr);

	start = get_timer(0);
	while (get_timer(start) < timeout) {
	if (!(readl(&mac_p->miiaddr) & MII_BUSY))
	return readl(&mac_p->miidata);
	udelay(10);
	};

	return -1;
	}

	static int dw_mdio_write(struct mii_dev *bus, int addr, int devad, int reg,
	u16 val)
	{
	struct eth_mac_regs *mac_p = bus->priv;
	ulong start;
	u16 miiaddr;
	int ret = -1, timeout = CONFIG_MDIO_TIMEOUT;

	writel(val, &mac_p->miidata);
	miiaddr = ((addr << MIIADDRSHIFT) & MII_ADDRMSK) \|
	((reg << MIIREGSHIFT) & MII_REGMSK) \| MII_WRITE;

	writel(miiaddr \| MII_CLKRANGE_150_250M \| MII_BUSY, &mac_p->miiaddr);

	start = get_timer(0);
	while (get_timer(start) < timeout) {
	if (!(readl(&mac_p->miiaddr) & MII_BUSY)) {
	ret = 0;
	break;
	}
	udelay(10);
	};

	return ret;
	}

	static int dw_mdio_init(char name, struct eth_mac_regs mac_regs_p)
	{
	struct mii_dev *bus = mdio_alloc();

	if (!bus) {
	printf("Failed to allocate MDIO bus\n");
	return -1;
	}

	bus->read = dw_mdio_read;
	bus->write = dw_mdio_write;
	sprintf(bus->name, name);

	bus->priv = (void *)mac_regs_p;

	return mdio_register(bus);
	}

	static void tx_descs_init(struct eth_device *dev)
	{
	struct dw_eth_dev *priv = dev->priv;
	struct eth_dma_regs *dma_p = priv->dma_regs_p;
	struct dmamacdescr *desc_table_p = &priv->tx_mac_descrtable[0];
	char *txbuffs = &priv->txbuffs[0];
	struct dmamacdescr *desc_p;
	u32 idx;

	for (idx = 0; idx < CONFIG_TX_DESCR_NUM; idx++) {
	desc_p = &desc_table_p[idx];
	desc_p->dmamac_addr = &txbuffs[idx * CONFIG_ETH_BUFSIZE];
	desc_p->dmamac_next = &desc_table_p[idx + 1];

	#if defined(CONFIG_DW_ALTDESCRIPTOR)
	desc_p->txrx_status &= ~(DESC_TXSTS_TXINT \| DESC_TXSTS_TXLAST \|
	DESC_TXSTS_TXFIRST \| DESC_TXSTS_TXCRCDIS \| \
	DESC_TXSTS_TXCHECKINSCTRL \| \
	DESC_TXSTS_TXRINGEND \| DESC_TXSTS_TXPADDIS);

	desc_p->txrx_status \|= DESC_TXSTS_TXCHAIN;
	desc_p->dmamac_cntl = 0;
	desc_p->txrx_status &= ~(DESC_TXSTS_MSK \| DESC_TXSTS_OWNBYDMA);
	#else
	desc_p->dmamac_cntl = DESC_TXCTRL_TXCHAIN;
	desc_p->txrx_status = 0;
	#endif
	}

	/* Correcting the last pointer of the chain */
	desc_p->dmamac_next = &desc_table_p[0];

	/* Flush all Tx buffer descriptors at once */
	flush_dcache_range((unsigned int)priv->tx_mac_descrtable,
	(unsigned int)priv->tx_mac_descrtable +
	sizeof(priv->tx_mac_descrtable));

	writel((ulong)&desc_table_p[0], &dma_p->txdesclistaddr);
	priv->tx_currdescnum = 0;
	}

	static void rx_descs_init(struct eth_device *dev)
	{
	struct dw_eth_dev *priv = dev->priv;
	struct eth_dma_regs *dma_p = priv->dma_regs_p;
	struct dmamacdescr *desc_table_p = &priv->rx_mac_descrtable[0];
	char *rxbuffs = &priv->rxbuffs[0];
	struct dmamacdescr *desc_p;
	u32 idx;

	/* Before passing buffers to GMAC we need to make sure zeros
	* written there right after "priv" structure allocation were
	* flushed into RAM.
	* Otherwise there's a chance to get some of them flushed in RAM when
	* GMAC is already pushing data to RAM via DMA. This way incoming from
	* GMAC data will be corrupted. */
	flush_dcache_range((unsigned int)rxbuffs, (unsigned int)rxbuffs +
	RX_TOTAL_BUFSIZE);

	for (idx = 0; idx < CONFIG_RX_DESCR_NUM; idx++) {
	desc_p = &desc_table_p[idx];
	desc_p->dmamac_addr = &rxbuffs[idx * CONFIG_ETH_BUFSIZE];
	desc_p->dmamac_next = &desc_table_p[idx + 1];

	desc_p->dmamac_cntl =
	(MAC_MAX_FRAME_SZ & DESC_RXCTRL_SIZE1MASK) \| \
	DESC_RXCTRL_RXCHAIN;

	desc_p->txrx_status = DESC_RXSTS_OWNBYDMA;
	}

	/* Correcting the last pointer of the chain */
	desc_p->dmamac_next = &desc_table_p[0];

	/* Flush all Rx buffer descriptors at once */
	flush_dcache_range((unsigned int)priv->rx_mac_descrtable,
	(unsigned int)priv->rx_mac_descrtable +
	sizeof(priv->rx_mac_descrtable));

	writel((ulong)&desc_table_p[0], &dma_p->rxdesclistaddr);
	priv->rx_currdescnum = 0;
	}

	static int dw_write_hwaddr(struct eth_device *dev)
	{
	struct dw_eth_dev *priv = dev->priv;
	struct eth_mac_regs *mac_p = priv->mac_regs_p;
	u32 macid_lo, macid_hi;
	u8 *mac_id = &dev->enetaddr[0];

	macid_lo = mac_id[0] + (mac_id[1] << 8) + (mac_id[2] << 16) +
	(mac_id[3] << 24);
	macid_hi = mac_id[4] + (mac_id[5] << 8);

	writel(macid_hi, &mac_p->macaddr0hi);
	writel(macid_lo, &mac_p->macaddr0lo);

	return 0;
	}

	static void dw_adjust_link(struct eth_mac_regs *mac_p,
	struct phy_device *phydev)
	{
	u32 conf = readl(&mac_p->conf) \| FRAMEBURSTENABLE \| DISABLERXOWN;

	if (!phydev->link) {
	printf("%s: No link.\n", phydev->dev->name);
	return;
	}

	if (phydev->speed != 1000)
	conf \|= MII_PORTSELECT;

	if (phydev->speed == 100)
	conf \|= FES_100;

	if (phydev->duplex)
	conf \|= FULLDPLXMODE;

	writel(conf, &mac_p->conf);

	printf("Speed: %d, %s duplex%s\n", phydev->speed,
	(phydev->duplex) ? "full" : "half",
	(phydev->port == PORT_FIBRE) ? ", fiber mode" : "");
	}

	static void dw_eth_halt(struct eth_device *dev)
	{
	struct dw_eth_dev *priv = dev->priv;
	struct eth_mac_regs *mac_p = priv->mac_regs_p;
	struct eth_dma_regs *dma_p = priv->dma_regs_p;

	writel(readl(&mac_p->conf) & ~(RXENABLE \| TXENABLE), &mac_p->conf);
	writel(readl(&dma_p->opmode) & ~(RXSTART \| TXSTART), &dma_p->opmode);

	phy_shutdown(priv->phydev);
	}

	static int dw_eth_init(struct eth_device dev, bd_t bis)
	{
	struct dw_eth_dev *priv = dev->priv;
	struct eth_mac_regs *mac_p = priv->mac_regs_p;
	struct eth_dma_regs *dma_p = priv->dma_regs_p;
	unsigned int start;

	writel(readl(&dma_p->busmode) \| DMAMAC_SRST, &dma_p->busmode);

	start = get_timer(0);
	while (readl(&dma_p->busmode) & DMAMAC_SRST) {
	if (get_timer(start) >= CONFIG_MACRESET_TIMEOUT)
	return -1;

	mdelay(100);
	};

	/* Soft reset above clears HW address registers.
	* So we have to set it here once again */
	dw_write_hwaddr(dev);

	rx_descs_init(dev);
	tx_descs_init(dev);

	writel(FIXEDBURST \| PRIORXTX_41 \| BURST_16, &dma_p->busmode);

	writel(readl(&dma_p->opmode) \| FLUSHTXFIFO \| STOREFORWARD,
	&dma_p->opmode);

	writel(readl(&dma_p->opmode) \| RXSTART \| TXSTART, &dma_p->opmode);

	/* Start up the PHY */
	if (phy_startup(priv->phydev)) {
	printf("Could not initialize PHY %s\n",
	priv->phydev->dev->name);
	return -1;
	}

	dw_adjust_link(mac_p, priv->phydev);

	if (!priv->phydev->link)
	return -1;

	writel(readl(&mac_p->conf) \| RXENABLE \| TXENABLE, &mac_p->conf);

	return 0;
	}

	static int dw_eth_send(struct eth_device dev, void packet, int length)
	{
	struct dw_eth_dev *priv = dev->priv;
	struct eth_dma_regs *dma_p = priv->dma_regs_p;
	u32 desc_num = priv->tx_currdescnum;
	struct dmamacdescr *desc_p = &priv->tx_mac_descrtable[desc_num];

	/* Invalidate only "status" field for the following check */
	invalidate_dcache_range((unsigned long)&desc_p->txrx_status,
	(unsigned long)&desc_p->txrx_status +
	sizeof(desc_p->txrx_status));

	/* Check if the descriptor is owned by CPU */
	if (desc_p->txrx_status & DESC_TXSTS_OWNBYDMA) {
	printf("CPU not owner of tx frame\n");
	return -1;
	}

	memcpy((void *)desc_p->dmamac_addr, packet, length);

	/* Flush data to be sent */
	flush_dcache_range((unsigned long)desc_p->dmamac_addr,
	(unsigned long)desc_p->dmamac_addr + length);

	#if defined(CONFIG_DW_ALTDESCRIPTOR)
	desc_p->txrx_status \|= DESC_TXSTS_TXFIRST \| DESC_TXSTS_TXLAST;
	desc_p->dmamac_cntl \|= (length << DESC_TXCTRL_SIZE1SHFT) & \
	DESC_TXCTRL_SIZE1MASK;

	desc_p->txrx_status &= ~(DESC_TXSTS_MSK);
	desc_p->txrx_status \|= DESC_TXSTS_OWNBYDMA;
	#else
	desc_p->dmamac_cntl \|= ((length << DESC_TXCTRL_SIZE1SHFT) & \
	DESC_TXCTRL_SIZE1MASK) \| DESC_TXCTRL_TXLAST \| \
	DESC_TXCTRL_TXFIRST;

	desc_p->txrx_status = DESC_TXSTS_OWNBYDMA;
	#endif

	/* Flush modified buffer descriptor */
	flush_dcache_range((unsigned long)desc_p,
	(unsigned long)desc_p + sizeof(struct dmamacdescr));

	/* Test the wrap-around condition. */
	if (++desc_num >= CONFIG_TX_DESCR_NUM)
	desc_num = 0;

	priv->tx_currdescnum = desc_num;

	/* Start the transmission */
	writel(POLL_DATA, &dma_p->txpolldemand);

	return 0;
	}

	static int dw_eth_recv(struct eth_device *dev)
	{
	struct dw_eth_dev *priv = dev->priv;
	u32 status, desc_num = priv->rx_currdescnum;
	struct dmamacdescr *desc_p = &priv->rx_mac_descrtable[desc_num];
	int length = 0;

	/* Invalidate entire buffer descriptor */
	invalidate_dcache_range((unsigned long)desc_p,
	(unsigned long)desc_p +
	sizeof(struct dmamacdescr));

	status = desc_p->txrx_status;

	/* Check if the owner is the CPU */
	if (!(status & DESC_RXSTS_OWNBYDMA)) {

	length = (status & DESC_RXSTS_FRMLENMSK) >> \
	DESC_RXSTS_FRMLENSHFT;

	/* Invalidate received data */
	invalidate_dcache_range((unsigned long)desc_p->dmamac_addr,
	(unsigned long)desc_p->dmamac_addr +
	length);

	NetReceive(desc_p->dmamac_addr, length);

	/*
	* Make the current descriptor valid again and go to
	* the next one
	*/
	desc_p->txrx_status \|= DESC_RXSTS_OWNBYDMA;

	/* Flush only status field - others weren't changed */
	flush_dcache_range((unsigned long)&desc_p->txrx_status,
	(unsigned long)&desc_p->txrx_status +
	sizeof(desc_p->txrx_status));

	/* Test the wrap-around condition. */
	if (++desc_num >= CONFIG_RX_DESCR_NUM)
	desc_num = 0;
	}

	priv->rx_currdescnum = desc_num;

	return length;
	}

	static int dw_phy_init(struct eth_device *dev)
	{
	struct dw_eth_dev *priv = dev->priv;
	struct phy_device *phydev;
	int mask = 0xffffffff;

	#ifdef CONFIG_PHY_ADDR
	mask = 1 << CONFIG_PHY_ADDR;
	#endif

	phydev = phy_find_by_mask(priv->bus, mask, priv->interface);
	if (!phydev)
	return -1;

	phydev->supported &= PHY_GBIT_FEATURES;
	phydev->advertising = phydev->supported;

	priv->phydev = phydev;
	phy_config(phydev);

	return 1;
	}

	int designware_initialize(ulong base_addr, u32 interface)
	{
	struct eth_device *dev;
	struct dw_eth_dev *priv;

	dev = (struct eth_device *) malloc(sizeof(struct eth_device));
	if (!dev)
	return -ENOMEM;

	/*
	* Since the priv structure contains the descriptors which need a strict
	* buswidth alignment, memalign is used to allocate memory
	*/
	priv = (struct dw_eth_dev *) memalign(16, sizeof(struct dw_eth_dev));
	if (!priv) {
	free(dev);
	return -ENOMEM;
	}

	memset(dev, 0, sizeof(struct eth_device));
	memset(priv, 0, sizeof(struct dw_eth_dev));

	sprintf(dev->name, "dwmac.%lx", base_addr);
	dev->iobase = (int)base_addr;
	dev->priv = priv;

	priv->dev = dev;
	priv->mac_regs_p = (struct eth_mac_regs *)base_addr;
	priv->dma_regs_p = (struct eth_dma_regs *)(base_addr +
	DW_DMA_BASE_OFFSET);

	dev->init = dw_eth_init;
	dev->send = dw_eth_send;
	dev->recv = dw_eth_recv;
	dev->halt = dw_eth_halt;
	dev->write_hwaddr = dw_write_hwaddr;

	eth_register(dev);

	priv->interface = interface;

	dw_mdio_init(dev->name, priv->mac_regs_p);
	priv->bus = miiphy_get_dev_by_name(dev->name);

	return dw_phy_init(dev);
	}