drivers/net/pch_gbe.c - filogic/uboot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
  *
  * Intel Platform Controller Hub EG20T (codename Topcliff) GMAC Driver
  */

 #include <cpu_func.h>
 #include <dm.h>
 #include <errno.h>
 #include <log.h>
 #include <malloc.h>
 #include <asm/io.h>
 #include <pci.h>
 #include <miiphy.h>
 #include <linux/delay.h>
 #include "pch_gbe.h"

 #if !defined(CONFIG_PHYLIB)
 # error "PCH Gigabit Ethernet driver requires PHYLIB - missing CONFIG_PHYLIB"
 #endif

 static struct pci_device_id supported[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_TCF_GBE) },
 	{ }
 };

 static void pch_gbe_mac_read(struct pch_gbe_regs *mac_regs, u8 *addr)
 {
 	u32 macid_hi, macid_lo;

 	macid_hi = readl(&mac_regs->mac_adr[0].high);
 	macid_lo = readl(&mac_regs->mac_adr[0].low) & 0xffff;
 	debug("pch_gbe: macid_hi %#x macid_lo %#x\n", macid_hi, macid_lo);

 	addr[0] = (u8)(macid_hi & 0xff);
 	addr[1] = (u8)((macid_hi >> 8) & 0xff);
 	addr[2] = (u8)((macid_hi >> 16) & 0xff);
 	addr[3] = (u8)((macid_hi >> 24) & 0xff);
 	addr[4] = (u8)(macid_lo & 0xff);
 	addr[5] = (u8)((macid_lo >> 8) & 0xff);
 }

 static int pch_gbe_mac_write(struct pch_gbe_regs *mac_regs, u8 *addr)
 {
 	u32 macid_hi, macid_lo;
 	ulong start;

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

 	writel(macid_hi, &mac_regs->mac_adr[0].high);
 	writel(macid_lo, &mac_regs->mac_adr[0].low);
 	writel(0xfffe, &mac_regs->addr_mask);

 	start = get_timer(0);
 	while (get_timer(start) < PCH_GBE_TIMEOUT) {
 		if (!(readl(&mac_regs->addr_mask) & PCH_GBE_BUSY))
 			return 0;

 		udelay(10);
 	}

 	return -ETIME;
 }

 static int pch_gbe_reset(struct udevice *dev)
 {
 	struct pch_gbe_priv *priv = dev_get_priv(dev);
 	struct eth_pdata *plat = dev_get_plat(dev);
 	struct pch_gbe_regs *mac_regs = priv->mac_regs;
 	ulong start;

 	priv->rx_idx = 0;
 	priv->tx_idx = 0;

 	writel(PCH_GBE_ALL_RST, &mac_regs->reset);

 	/*
 	 * Configure the MAC to RGMII mode after reset
 	 *
 	 * For some unknown reason, we must do the configuration here right
 	 * after resetting the whole MAC, otherwise the reset bit in the RESET
 	 * register will never be cleared by the hardware. And there is another
 	 * way of having the same magic, that is to configure the MODE register
 	 * to have the MAC work in MII/GMII mode, which is how current Linux
 	 * pch_gbe driver does. Since anyway we need program the MAC to RGMII
 	 * mode in the driver, we just do it here.
 	 *
 	 * Note: this behavior is not documented in the hardware manual.
 	 */
 	writel(PCH_GBE_RGMII_MODE_RGMII | PCH_GBE_CHIP_TYPE_INTERNAL,
 	       &mac_regs->rgmii_ctrl);

 	start = get_timer(0);
 	while (get_timer(start) < PCH_GBE_TIMEOUT) {
 		if (!(readl(&mac_regs->reset) & PCH_GBE_ALL_RST)) {
 			/*
 			 * Soft reset clears hardware MAC address registers,
 			 * so we have to reload MAC address here in order to
 			 * make linux pch_gbe driver happy.
 			 */
 			return pch_gbe_mac_write(mac_regs, plat->enetaddr);
 		}

 		udelay(10);
 	}

 	debug("pch_gbe: reset timeout\n");
 	return -ETIME;
 }

 static void pch_gbe_rx_descs_init(struct udevice *dev)
 {
 	struct pch_gbe_priv *priv = dev_get_priv(dev);
 	struct pch_gbe_regs *mac_regs = priv->mac_regs;
 	struct pch_gbe_rx_desc *rx_desc = &priv->rx_desc[0];
 	int i;

 	memset(rx_desc, 0, sizeof(struct pch_gbe_rx_desc) * PCH_GBE_DESC_NUM);
 	for (i = 0; i < PCH_GBE_DESC_NUM; i++)
 		rx_desc[i].buffer_addr = dm_pci_virt_to_mem(priv->dev,
 			priv->rx_buff[i]);

 	flush_dcache_range((ulong)rx_desc, (ulong)&rx_desc[PCH_GBE_DESC_NUM]);

 	writel(dm_pci_virt_to_mem(priv->dev, rx_desc),
 	       &mac_regs->rx_dsc_base);
 	writel(sizeof(struct pch_gbe_rx_desc) * (PCH_GBE_DESC_NUM - 1),
 	       &mac_regs->rx_dsc_size);

 	writel(dm_pci_virt_to_mem(priv->dev, rx_desc + 1),
 	       &mac_regs->rx_dsc_sw_p);
 }

 static void pch_gbe_tx_descs_init(struct udevice *dev)
 {
 	struct pch_gbe_priv *priv = dev_get_priv(dev);
 	struct pch_gbe_regs *mac_regs = priv->mac_regs;
 	struct pch_gbe_tx_desc *tx_desc = &priv->tx_desc[0];

 	memset(tx_desc, 0, sizeof(struct pch_gbe_tx_desc) * PCH_GBE_DESC_NUM);

 	flush_dcache_range((ulong)tx_desc, (ulong)&tx_desc[PCH_GBE_DESC_NUM]);

 	writel(dm_pci_virt_to_mem(priv->dev, tx_desc),
 	       &mac_regs->tx_dsc_base);
 	writel(sizeof(struct pch_gbe_tx_desc) * (PCH_GBE_DESC_NUM - 1),
 	       &mac_regs->tx_dsc_size);
 	writel(dm_pci_virt_to_mem(priv->dev, tx_desc + 1),
 	       &mac_regs->tx_dsc_sw_p);
 }

 static void pch_gbe_adjust_link(struct pch_gbe_regs *mac_regs,
 				struct phy_device *phydev)
 {
 	if (!phydev->link) {
 		printf("%s: No link.\n", phydev->dev->name);
 		return;
 	}

 	clrbits_le32(&mac_regs->rgmii_ctrl,
 		     PCH_GBE_RGMII_RATE_2_5M | PCH_GBE_CRS_SEL);
 	clrbits_le32(&mac_regs->mode,
 		     PCH_GBE_MODE_GMII_ETHER | PCH_GBE_MODE_FULL_DUPLEX);

 	switch (phydev->speed) {
 	case 1000:
 		setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_RGMII_RATE_125M);
 		setbits_le32(&mac_regs->mode, PCH_GBE_MODE_GMII_ETHER);
 		break;
 	case 100:
 		setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_RGMII_RATE_25M);
 		setbits_le32(&mac_regs->mode, PCH_GBE_MODE_MII_ETHER);
 		break;
 	case 10:
 		setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_RGMII_RATE_2_5M);
 		setbits_le32(&mac_regs->mode, PCH_GBE_MODE_MII_ETHER);
 		break;
 	}

 	if (phydev->duplex) {
 		setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_CRS_SEL);
 		setbits_le32(&mac_regs->mode, PCH_GBE_MODE_FULL_DUPLEX);
 	}

 	printf("Speed: %d, %s duplex\n", phydev->speed,
 	       (phydev->duplex) ? "full" : "half");

 	return;
 }

 static int pch_gbe_start(struct udevice *dev)
 {
 	struct pch_gbe_priv *priv = dev_get_priv(dev);
 	struct pch_gbe_regs *mac_regs = priv->mac_regs;

 	if (pch_gbe_reset(dev))
 		return -1;

 	pch_gbe_rx_descs_init(dev);
 	pch_gbe_tx_descs_init(dev);

 	/* Enable frame bursting */
 	writel(PCH_GBE_MODE_FR_BST, &mac_regs->mode);
 	/* Disable TCP/IP accelerator */
 	writel(PCH_GBE_RX_TCPIPACC_OFF, &mac_regs->tcpip_acc);
 	/* Disable RX flow control */
 	writel(0, &mac_regs->rx_fctrl);
 	/* Configure RX/TX mode */
 	writel(PCH_GBE_RH_ALM_EMP_16 | PCH_GBE_RH_ALM_FULL_16 |
 	       PCH_GBE_RH_RD_TRG_32, &mac_regs->rx_mode);
 	writel(PCH_GBE_TM_TH_TX_STRT_32 | PCH_GBE_TM_TH_ALM_EMP_16 |
 	       PCH_GBE_TM_TH_ALM_FULL_32 | PCH_GBE_TM_ST_AND_FD |
 	       PCH_GBE_TM_SHORT_PKT, &mac_regs->tx_mode);

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

 	pch_gbe_adjust_link(mac_regs, priv->phydev);

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

 	/* Enable TX & RX */
 	writel(PCH_GBE_RX_DMA_EN | PCH_GBE_TX_DMA_EN, &mac_regs->dma_ctrl);
 	writel(PCH_GBE_MRE_MAC_RX_EN, &mac_regs->mac_rx_en);

 	return 0;
 }

 static void pch_gbe_stop(struct udevice *dev)
 {
 	struct pch_gbe_priv *priv = dev_get_priv(dev);

 	pch_gbe_reset(dev);

 	phy_shutdown(priv->phydev);
 }

 static int pch_gbe_send(struct udevice *dev, void *packet, int length)
 {
 	struct pch_gbe_priv *priv = dev_get_priv(dev);
 	struct pch_gbe_regs *mac_regs = priv->mac_regs;
 	struct pch_gbe_tx_desc *tx_head, *tx_desc;
 	u16 frame_ctrl = 0;
 	u32 int_st;
 	ulong start;

 	flush_dcache_range((ulong)packet, (ulong)packet + length);

 	tx_head = &priv->tx_desc[0];
 	tx_desc = &priv->tx_desc[priv->tx_idx];

 	if (length < 64)
 		frame_ctrl |= PCH_GBE_TXD_CTRL_APAD;

 	tx_desc->buffer_addr = dm_pci_virt_to_mem(priv->dev, packet);
 	tx_desc->length = length;
 	tx_desc->tx_words_eob = length + 3;
 	tx_desc->tx_frame_ctrl = frame_ctrl;
 	tx_desc->dma_status = 0;
 	tx_desc->gbec_status = 0;

 	flush_dcache_range((ulong)tx_desc, (ulong)&tx_desc[1]);

 	/* Test the wrap-around condition */
 	if (++priv->tx_idx >= PCH_GBE_DESC_NUM)
 		priv->tx_idx = 0;

 	writel(dm_pci_virt_to_mem(priv->dev, tx_head + priv->tx_idx),
 	       &mac_regs->tx_dsc_sw_p);

 	start = get_timer(0);
 	while (get_timer(start) < PCH_GBE_TIMEOUT) {
 		int_st = readl(&mac_regs->int_st);
 		if (int_st & PCH_GBE_INT_TX_CMPLT)
 			return 0;

 		udelay(10);
 	}

 	debug("pch_gbe: sent failed\n");
 	return -ETIME;
 }

 static int pch_gbe_recv(struct udevice *dev, int flags, uchar **packetp)
 {
 	struct pch_gbe_priv *priv = dev_get_priv(dev);
 	struct pch_gbe_regs *mac_regs = priv->mac_regs;
 	struct pch_gbe_rx_desc *rx_desc;
 	ulong hw_desc, length;
 	void *buffer;

 	rx_desc = &priv->rx_desc[priv->rx_idx];

 	readl(&mac_regs->int_st);
 	hw_desc = readl(&mac_regs->rx_dsc_hw_p_hld);

 	/* Just return if not receiving any packet */
 	if (virt_to_phys(rx_desc) == hw_desc)
 		return -EAGAIN;

 	/* Invalidate the descriptor */
 	invalidate_dcache_range((ulong)rx_desc, (ulong)&rx_desc[1]);

 	length = rx_desc->rx_words_eob - 3 - ETH_FCS_LEN;
 	buffer = dm_pci_mem_to_virt(priv->dev, rx_desc->buffer_addr, length, 0);
 	invalidate_dcache_range((ulong)buffer, (ulong)buffer + length);
 	*packetp = (uchar *)buffer;

 	return length;
 }

 static int pch_gbe_free_pkt(struct udevice *dev, uchar *packet, int length)
 {
 	struct pch_gbe_priv *priv = dev_get_priv(dev);
 	struct pch_gbe_regs *mac_regs = priv->mac_regs;
 	struct pch_gbe_rx_desc *rx_head = &priv->rx_desc[0];
 	int rx_swp;

 	/* Test the wrap-around condition */
 	if (++priv->rx_idx >= PCH_GBE_DESC_NUM)
 		priv->rx_idx = 0;
 	rx_swp = priv->rx_idx;
 	if (++rx_swp >= PCH_GBE_DESC_NUM)
 		rx_swp = 0;

 	writel(dm_pci_virt_to_mem(priv->dev, rx_head + rx_swp),
 	       &mac_regs->rx_dsc_sw_p);

 	return 0;
 }

 static int pch_gbe_mdio_ready(struct pch_gbe_regs *mac_regs)
 {
 	ulong start = get_timer(0);

 	while (get_timer(start) < PCH_GBE_TIMEOUT) {
 		if (readl(&mac_regs->miim) & PCH_GBE_MIIM_OPER_READY)
 			return 0;

 		udelay(10);
 	}

 	return -ETIME;
 }

 static int pch_gbe_mdio_read(struct mii_dev *bus, int addr, int devad, int reg)
 {
 	struct pch_gbe_regs *mac_regs = bus->priv;
 	u32 miim;

 	if (pch_gbe_mdio_ready(mac_regs))
 		return -ETIME;

 	miim = (addr << PCH_GBE_MIIM_PHY_ADDR_SHIFT) |
 	       (reg << PCH_GBE_MIIM_REG_ADDR_SHIFT) |
 	       PCH_GBE_MIIM_OPER_READ;
 	writel(miim, &mac_regs->miim);

 	if (pch_gbe_mdio_ready(mac_regs))
 		return -ETIME;

 	return readl(&mac_regs->miim) & 0xffff;
 }

 static int pch_gbe_mdio_write(struct mii_dev *bus, int addr, int devad,
 			      int reg, u16 val)
 {
 	struct pch_gbe_regs *mac_regs = bus->priv;
 	u32 miim;

 	if (pch_gbe_mdio_ready(mac_regs))
 		return -ETIME;

 	miim = (addr << PCH_GBE_MIIM_PHY_ADDR_SHIFT) |
 	       (reg << PCH_GBE_MIIM_REG_ADDR_SHIFT) |
 	       PCH_GBE_MIIM_OPER_WRITE | val;
 	writel(miim, &mac_regs->miim);

 	if (pch_gbe_mdio_ready(mac_regs))
 		return -ETIME;
 	else
 		return 0;
 }

 static int pch_gbe_mdio_init(const char *name, struct pch_gbe_regs *mac_regs)
 {
 	struct mii_dev *bus;

 	bus = mdio_alloc();
 	if (!bus) {
 		debug("pch_gbe: failed to allocate MDIO bus\n");
 		return -ENOMEM;
 	}

 	bus->read = pch_gbe_mdio_read;
 	bus->write = pch_gbe_mdio_write;
 	strcpy(bus->name, name);

 	bus->priv = (void *)mac_regs;

 	return mdio_register(bus);
 }

 static int pch_gbe_phy_init(struct udevice *dev)
 {
 	struct pch_gbe_priv *priv = dev_get_priv(dev);
 	struct eth_pdata *plat = dev_get_plat(dev);
 	struct phy_device *phydev;

 	phydev = phy_connect(priv->bus, -1, dev, plat->phy_interface);
 	if (!phydev) {
 		printf("pch_gbe: cannot find the phy\n");
 		return -1;
 	}

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

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

 	return 0;
 }

 static int pch_gbe_probe(struct udevice *dev)
 {
 	struct pch_gbe_priv *priv;
 	struct eth_pdata *plat = dev_get_plat(dev);
 	void *iobase;
 	int err;

 	/*
 	 * The priv structure contains the descriptors and frame buffers which
 	 * need a strict buswidth alignment (64 bytes). This is guaranteed by
 	 * DM_FLAG_ALLOC_PRIV_DMA flag in the U_BOOT_DRIVER.
 	 */
 	priv = dev_get_priv(dev);

 	priv->dev = dev;

 	iobase = dm_pci_map_bar(dev, PCI_BASE_ADDRESS_1, 0, 0, PCI_REGION_TYPE, PCI_REGION_MEM);

 	plat->iobase = (ulong)iobase;
 	priv->mac_regs = (struct pch_gbe_regs *)iobase;

 	/* Read MAC address from SROM and initialize dev->enetaddr with it */
 	pch_gbe_mac_read(priv->mac_regs, plat->enetaddr);

 	plat->phy_interface = PHY_INTERFACE_MODE_RGMII;
 	pch_gbe_mdio_init(dev->name, priv->mac_regs);
 	priv->bus = miiphy_get_dev_by_name(dev->name);

 	err = pch_gbe_reset(dev);
 	if (err)
 		return err;

 	return pch_gbe_phy_init(dev);
 }

 static int pch_gbe_remove(struct udevice *dev)
 {
 	struct pch_gbe_priv *priv = dev_get_priv(dev);

 	free(priv->phydev);
 	mdio_unregister(priv->bus);
 	mdio_free(priv->bus);

 	return 0;
 }

 static const struct eth_ops pch_gbe_ops = {
 	.start = pch_gbe_start,
 	.send = pch_gbe_send,
 	.recv = pch_gbe_recv,
 	.free_pkt = pch_gbe_free_pkt,
 	.stop = pch_gbe_stop,
 };

 static const struct udevice_id pch_gbe_ids[] = {
 	{ .compatible = "intel,pch-gbe" },
 	{ }
 };

 U_BOOT_DRIVER(eth_pch_gbe) = {
 	.name = "pch_gbe",
 	.id = UCLASS_ETH,
 	.of_match = pch_gbe_ids,
 	.probe = pch_gbe_probe,
 	.remove = pch_gbe_remove,
 	.ops = &pch_gbe_ops,
 	.priv_auto	= sizeof(struct pch_gbe_priv),
 	.plat_auto	= sizeof(struct eth_pdata),
 	.flags = DM_FLAG_ALLOC_PRIV_DMA,
 };

 U_BOOT_PCI_DEVICE(eth_pch_gbe, supported);
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
	*
	* Intel Platform Controller Hub EG20T (codename Topcliff) GMAC Driver
	*/

	#include <cpu_func.h>
	#include <dm.h>
	#include <errno.h>
	#include <log.h>
	#include <malloc.h>
	#include <asm/io.h>
	#include <pci.h>
	#include <miiphy.h>
	#include <linux/delay.h>
	#include "pch_gbe.h"

	#if !defined(CONFIG_PHYLIB)
	# error "PCH Gigabit Ethernet driver requires PHYLIB - missing CONFIG_PHYLIB"
	#endif

	static struct pci_device_id supported[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_TCF_GBE) },
	{ }
	};

	static void pch_gbe_mac_read(struct pch_gbe_regs mac_regs, u8 addr)
	{
	u32 macid_hi, macid_lo;

	macid_hi = readl(&mac_regs->mac_adr[0].high);
	macid_lo = readl(&mac_regs->mac_adr[0].low) & 0xffff;
	debug("pch_gbe: macid_hi %#x macid_lo %#x\n", macid_hi, macid_lo);

	addr[0] = (u8)(macid_hi & 0xff);
	addr[1] = (u8)((macid_hi >> 8) & 0xff);
	addr[2] = (u8)((macid_hi >> 16) & 0xff);
	addr[3] = (u8)((macid_hi >> 24) & 0xff);
	addr[4] = (u8)(macid_lo & 0xff);
	addr[5] = (u8)((macid_lo >> 8) & 0xff);
	}

	static int pch_gbe_mac_write(struct pch_gbe_regs mac_regs, u8 addr)
	{
	u32 macid_hi, macid_lo;
	ulong start;

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

	writel(macid_hi, &mac_regs->mac_adr[0].high);
	writel(macid_lo, &mac_regs->mac_adr[0].low);
	writel(0xfffe, &mac_regs->addr_mask);

	start = get_timer(0);
	while (get_timer(start) < PCH_GBE_TIMEOUT) {
	if (!(readl(&mac_regs->addr_mask) & PCH_GBE_BUSY))
	return 0;

	udelay(10);
	}

	return -ETIME;
	}

	static int pch_gbe_reset(struct udevice *dev)
	{
	struct pch_gbe_priv *priv = dev_get_priv(dev);
	struct eth_pdata *plat = dev_get_plat(dev);
	struct pch_gbe_regs *mac_regs = priv->mac_regs;
	ulong start;

	priv->rx_idx = 0;
	priv->tx_idx = 0;

	writel(PCH_GBE_ALL_RST, &mac_regs->reset);

	/*
	* Configure the MAC to RGMII mode after reset
	*
	* For some unknown reason, we must do the configuration here right
	* after resetting the whole MAC, otherwise the reset bit in the RESET
	* register will never be cleared by the hardware. And there is another
	* way of having the same magic, that is to configure the MODE register
	* to have the MAC work in MII/GMII mode, which is how current Linux
	* pch_gbe driver does. Since anyway we need program the MAC to RGMII
	* mode in the driver, we just do it here.
	*
	* Note: this behavior is not documented in the hardware manual.
	*/
	writel(PCH_GBE_RGMII_MODE_RGMII \| PCH_GBE_CHIP_TYPE_INTERNAL,
	&mac_regs->rgmii_ctrl);

	start = get_timer(0);
	while (get_timer(start) < PCH_GBE_TIMEOUT) {
	if (!(readl(&mac_regs->reset) & PCH_GBE_ALL_RST)) {
	/*
	* Soft reset clears hardware MAC address registers,
	* so we have to reload MAC address here in order to
	* make linux pch_gbe driver happy.
	*/
	return pch_gbe_mac_write(mac_regs, plat->enetaddr);
	}

	udelay(10);
	}

	debug("pch_gbe: reset timeout\n");
	return -ETIME;
	}

	static void pch_gbe_rx_descs_init(struct udevice *dev)
	{
	struct pch_gbe_priv *priv = dev_get_priv(dev);
	struct pch_gbe_regs *mac_regs = priv->mac_regs;
	struct pch_gbe_rx_desc *rx_desc = &priv->rx_desc[0];
	int i;

	memset(rx_desc, 0, sizeof(struct pch_gbe_rx_desc) * PCH_GBE_DESC_NUM);
	for (i = 0; i < PCH_GBE_DESC_NUM; i++)
	rx_desc[i].buffer_addr = dm_pci_virt_to_mem(priv->dev,
	priv->rx_buff[i]);

	flush_dcache_range((ulong)rx_desc, (ulong)&rx_desc[PCH_GBE_DESC_NUM]);

	writel(dm_pci_virt_to_mem(priv->dev, rx_desc),
	&mac_regs->rx_dsc_base);
	writel(sizeof(struct pch_gbe_rx_desc) * (PCH_GBE_DESC_NUM - 1),
	&mac_regs->rx_dsc_size);

	writel(dm_pci_virt_to_mem(priv->dev, rx_desc + 1),
	&mac_regs->rx_dsc_sw_p);
	}

	static void pch_gbe_tx_descs_init(struct udevice *dev)
	{
	struct pch_gbe_priv *priv = dev_get_priv(dev);
	struct pch_gbe_regs *mac_regs = priv->mac_regs;
	struct pch_gbe_tx_desc *tx_desc = &priv->tx_desc[0];

	memset(tx_desc, 0, sizeof(struct pch_gbe_tx_desc) * PCH_GBE_DESC_NUM);

	flush_dcache_range((ulong)tx_desc, (ulong)&tx_desc[PCH_GBE_DESC_NUM]);

	writel(dm_pci_virt_to_mem(priv->dev, tx_desc),
	&mac_regs->tx_dsc_base);
	writel(sizeof(struct pch_gbe_tx_desc) * (PCH_GBE_DESC_NUM - 1),
	&mac_regs->tx_dsc_size);
	writel(dm_pci_virt_to_mem(priv->dev, tx_desc + 1),
	&mac_regs->tx_dsc_sw_p);
	}

	static void pch_gbe_adjust_link(struct pch_gbe_regs *mac_regs,
	struct phy_device *phydev)
	{
	if (!phydev->link) {
	printf("%s: No link.\n", phydev->dev->name);
	return;
	}

	clrbits_le32(&mac_regs->rgmii_ctrl,
	PCH_GBE_RGMII_RATE_2_5M \| PCH_GBE_CRS_SEL);
	clrbits_le32(&mac_regs->mode,
	PCH_GBE_MODE_GMII_ETHER \| PCH_GBE_MODE_FULL_DUPLEX);

	switch (phydev->speed) {
	case 1000:
	setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_RGMII_RATE_125M);
	setbits_le32(&mac_regs->mode, PCH_GBE_MODE_GMII_ETHER);
	break;
	case 100:
	setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_RGMII_RATE_25M);
	setbits_le32(&mac_regs->mode, PCH_GBE_MODE_MII_ETHER);
	break;
	case 10:
	setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_RGMII_RATE_2_5M);
	setbits_le32(&mac_regs->mode, PCH_GBE_MODE_MII_ETHER);
	break;
	}

	if (phydev->duplex) {
	setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_CRS_SEL);
	setbits_le32(&mac_regs->mode, PCH_GBE_MODE_FULL_DUPLEX);
	}

	printf("Speed: %d, %s duplex\n", phydev->speed,
	(phydev->duplex) ? "full" : "half");

	return;
	}

	static int pch_gbe_start(struct udevice *dev)
	{
	struct pch_gbe_priv *priv = dev_get_priv(dev);
	struct pch_gbe_regs *mac_regs = priv->mac_regs;

	if (pch_gbe_reset(dev))
	return -1;

	pch_gbe_rx_descs_init(dev);
	pch_gbe_tx_descs_init(dev);

	/* Enable frame bursting */
	writel(PCH_GBE_MODE_FR_BST, &mac_regs->mode);
	/* Disable TCP/IP accelerator */
	writel(PCH_GBE_RX_TCPIPACC_OFF, &mac_regs->tcpip_acc);
	/* Disable RX flow control */
	writel(0, &mac_regs->rx_fctrl);
	/* Configure RX/TX mode */
	writel(PCH_GBE_RH_ALM_EMP_16 \| PCH_GBE_RH_ALM_FULL_16 \|
	PCH_GBE_RH_RD_TRG_32, &mac_regs->rx_mode);
	writel(PCH_GBE_TM_TH_TX_STRT_32 \| PCH_GBE_TM_TH_ALM_EMP_16 \|
	PCH_GBE_TM_TH_ALM_FULL_32 \| PCH_GBE_TM_ST_AND_FD \|
	PCH_GBE_TM_SHORT_PKT, &mac_regs->tx_mode);

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

	pch_gbe_adjust_link(mac_regs, priv->phydev);

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

	/* Enable TX & RX */
	writel(PCH_GBE_RX_DMA_EN \| PCH_GBE_TX_DMA_EN, &mac_regs->dma_ctrl);
	writel(PCH_GBE_MRE_MAC_RX_EN, &mac_regs->mac_rx_en);

	return 0;
	}

	static void pch_gbe_stop(struct udevice *dev)
	{
	struct pch_gbe_priv *priv = dev_get_priv(dev);

	pch_gbe_reset(dev);

	phy_shutdown(priv->phydev);
	}

	static int pch_gbe_send(struct udevice dev, void packet, int length)
	{
	struct pch_gbe_priv *priv = dev_get_priv(dev);
	struct pch_gbe_regs *mac_regs = priv->mac_regs;
	struct pch_gbe_tx_desc tx_head, tx_desc;
	u16 frame_ctrl = 0;
	u32 int_st;
	ulong start;

	flush_dcache_range((ulong)packet, (ulong)packet + length);

	tx_head = &priv->tx_desc[0];
	tx_desc = &priv->tx_desc[priv->tx_idx];

	if (length < 64)
	frame_ctrl \|= PCH_GBE_TXD_CTRL_APAD;

	tx_desc->buffer_addr = dm_pci_virt_to_mem(priv->dev, packet);
	tx_desc->length = length;
	tx_desc->tx_words_eob = length + 3;
	tx_desc->tx_frame_ctrl = frame_ctrl;
	tx_desc->dma_status = 0;
	tx_desc->gbec_status = 0;

	flush_dcache_range((ulong)tx_desc, (ulong)&tx_desc[1]);

	/* Test the wrap-around condition */
	if (++priv->tx_idx >= PCH_GBE_DESC_NUM)
	priv->tx_idx = 0;

	writel(dm_pci_virt_to_mem(priv->dev, tx_head + priv->tx_idx),
	&mac_regs->tx_dsc_sw_p);

	start = get_timer(0);
	while (get_timer(start) < PCH_GBE_TIMEOUT) {
	int_st = readl(&mac_regs->int_st);
	if (int_st & PCH_GBE_INT_TX_CMPLT)
	return 0;

	udelay(10);
	}

	debug("pch_gbe: sent failed\n");
	return -ETIME;
	}

	static int pch_gbe_recv(struct udevice dev, int flags, uchar *packetp)
	{
	struct pch_gbe_priv *priv = dev_get_priv(dev);
	struct pch_gbe_regs *mac_regs = priv->mac_regs;
	struct pch_gbe_rx_desc *rx_desc;
	ulong hw_desc, length;
	void *buffer;

	rx_desc = &priv->rx_desc[priv->rx_idx];

	readl(&mac_regs->int_st);
	hw_desc = readl(&mac_regs->rx_dsc_hw_p_hld);

	/* Just return if not receiving any packet */
	if (virt_to_phys(rx_desc) == hw_desc)
	return -EAGAIN;

	/* Invalidate the descriptor */
	invalidate_dcache_range((ulong)rx_desc, (ulong)&rx_desc[1]);

	length = rx_desc->rx_words_eob - 3 - ETH_FCS_LEN;
	buffer = dm_pci_mem_to_virt(priv->dev, rx_desc->buffer_addr, length, 0);
	invalidate_dcache_range((ulong)buffer, (ulong)buffer + length);
	packetp = (uchar )buffer;

	return length;
	}

	static int pch_gbe_free_pkt(struct udevice dev, uchar packet, int length)
	{
	struct pch_gbe_priv *priv = dev_get_priv(dev);
	struct pch_gbe_regs *mac_regs = priv->mac_regs;
	struct pch_gbe_rx_desc *rx_head = &priv->rx_desc[0];
	int rx_swp;

	/* Test the wrap-around condition */
	if (++priv->rx_idx >= PCH_GBE_DESC_NUM)
	priv->rx_idx = 0;
	rx_swp = priv->rx_idx;
	if (++rx_swp >= PCH_GBE_DESC_NUM)
	rx_swp = 0;

	writel(dm_pci_virt_to_mem(priv->dev, rx_head + rx_swp),
	&mac_regs->rx_dsc_sw_p);

	return 0;
	}

	static int pch_gbe_mdio_ready(struct pch_gbe_regs *mac_regs)
	{
	ulong start = get_timer(0);

	while (get_timer(start) < PCH_GBE_TIMEOUT) {
	if (readl(&mac_regs->miim) & PCH_GBE_MIIM_OPER_READY)
	return 0;

	udelay(10);
	}

	return -ETIME;
	}

	static int pch_gbe_mdio_read(struct mii_dev *bus, int addr, int devad, int reg)
	{
	struct pch_gbe_regs *mac_regs = bus->priv;
	u32 miim;

	if (pch_gbe_mdio_ready(mac_regs))
	return -ETIME;

	miim = (addr << PCH_GBE_MIIM_PHY_ADDR_SHIFT) \|
	(reg << PCH_GBE_MIIM_REG_ADDR_SHIFT) \|
	PCH_GBE_MIIM_OPER_READ;
	writel(miim, &mac_regs->miim);

	if (pch_gbe_mdio_ready(mac_regs))
	return -ETIME;

	return readl(&mac_regs->miim) & 0xffff;
	}

	static int pch_gbe_mdio_write(struct mii_dev *bus, int addr, int devad,
	int reg, u16 val)
	{
	struct pch_gbe_regs *mac_regs = bus->priv;
	u32 miim;

	if (pch_gbe_mdio_ready(mac_regs))
	return -ETIME;

	miim = (addr << PCH_GBE_MIIM_PHY_ADDR_SHIFT) \|
	(reg << PCH_GBE_MIIM_REG_ADDR_SHIFT) \|
	PCH_GBE_MIIM_OPER_WRITE \| val;
	writel(miim, &mac_regs->miim);

	if (pch_gbe_mdio_ready(mac_regs))
	return -ETIME;
	else
	return 0;
	}

	static int pch_gbe_mdio_init(const char name, struct pch_gbe_regs mac_regs)
	{
	struct mii_dev *bus;

	bus = mdio_alloc();
	if (!bus) {
	debug("pch_gbe: failed to allocate MDIO bus\n");
	return -ENOMEM;
	}

	bus->read = pch_gbe_mdio_read;
	bus->write = pch_gbe_mdio_write;
	strcpy(bus->name, name);

	bus->priv = (void *)mac_regs;

	return mdio_register(bus);
	}

	static int pch_gbe_phy_init(struct udevice *dev)
	{
	struct pch_gbe_priv *priv = dev_get_priv(dev);
	struct eth_pdata *plat = dev_get_plat(dev);
	struct phy_device *phydev;

	phydev = phy_connect(priv->bus, -1, dev, plat->phy_interface);
	if (!phydev) {
	printf("pch_gbe: cannot find the phy\n");
	return -1;
	}

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

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

	return 0;
	}

	static int pch_gbe_probe(struct udevice *dev)
	{
	struct pch_gbe_priv *priv;
	struct eth_pdata *plat = dev_get_plat(dev);
	void *iobase;
	int err;

	/*
	* The priv structure contains the descriptors and frame buffers which
	* need a strict buswidth alignment (64 bytes). This is guaranteed by
	* DM_FLAG_ALLOC_PRIV_DMA flag in the U_BOOT_DRIVER.
	*/
	priv = dev_get_priv(dev);

	priv->dev = dev;

	iobase = dm_pci_map_bar(dev, PCI_BASE_ADDRESS_1, 0, 0, PCI_REGION_TYPE, PCI_REGION_MEM);

	plat->iobase = (ulong)iobase;
	priv->mac_regs = (struct pch_gbe_regs *)iobase;

	/* Read MAC address from SROM and initialize dev->enetaddr with it */
	pch_gbe_mac_read(priv->mac_regs, plat->enetaddr);

	plat->phy_interface = PHY_INTERFACE_MODE_RGMII;
	pch_gbe_mdio_init(dev->name, priv->mac_regs);
	priv->bus = miiphy_get_dev_by_name(dev->name);

	err = pch_gbe_reset(dev);
	if (err)
	return err;

	return pch_gbe_phy_init(dev);
	}

	static int pch_gbe_remove(struct udevice *dev)
	{
	struct pch_gbe_priv *priv = dev_get_priv(dev);

	free(priv->phydev);
	mdio_unregister(priv->bus);
	mdio_free(priv->bus);

	return 0;
	}

	static const struct eth_ops pch_gbe_ops = {
	.start = pch_gbe_start,
	.send = pch_gbe_send,
	.recv = pch_gbe_recv,
	.free_pkt = pch_gbe_free_pkt,
	.stop = pch_gbe_stop,
	};

	static const struct udevice_id pch_gbe_ids[] = {
	{ .compatible = "intel,pch-gbe" },
	{ }
	};

	U_BOOT_DRIVER(eth_pch_gbe) = {
	.name = "pch_gbe",
	.id = UCLASS_ETH,
	.of_match = pch_gbe_ids,
	.probe = pch_gbe_probe,
	.remove = pch_gbe_remove,
	.ops = &pch_gbe_ops,
	.priv_auto = sizeof(struct pch_gbe_priv),
	.plat_auto = sizeof(struct eth_pdata),
	.flags = DM_FLAG_ALLOC_PRIV_DMA,
	};

	U_BOOT_PCI_DEVICE(eth_pch_gbe, supported);