Merge branch 'hisilicon-mdio-femac'

Dongpo Li says:

====================
Add Hisilicon MDIO bus driver and FEMAC driver

This patch set adds a Hisilicon MDIO bus driver and
a Fast Ethernet MAC(FEMAC) driver.
We also abstract a general interface "of_phy_get_and_connect"
for PHY connect. User will have no bother with getting
"phy-mode" and "phy-handle" any more.

Changes in v1:
- Pass private data structure instead of struct mii_bus
  in MDIO read and write operation.
- Return the error which devm_clk_get() gives when MDIO probe.
- Leave the clock unprepared and disabled on error when MDIO probe.
- Abstract a general interface "of_phy_get_and_connect" for PHY connect.
- Remove the "_reset" suffixes in "reset-names" property.
- Enable tx per-packet interrupt when tx fifo full.
- Remove pointless compatible and add SoC specific compatible.
- Declare only one clock in MAC dts documentation.
- Add standard unit suffixes for "phy-reset-delays".
- Use a smaller NAPI poll weight 16 for our Fast Ethernet MAC.
- Use phy_ethtool_{get|set}_link_ksettings for ethtool ops.
- Use phydev from struct net_device in MAC driver.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/hisilicon-femac-mdio.txt

+Hisilicon Fast Ethernet MDIO Controller interface
+
+Required properties:
+- compatible: should be "hisilicon,hisi-femac-mdio".
+- reg: address and length of the register set for the device.
+- clocks: A phandle to the reference clock for this device.
+
+- PHY subnode: inherits from phy binding [1]
+[1] Documentation/devicetree/bindings/net/phy.txt
+
+Example:
+mdio: mdio@10091100 {
+	compatible = "hisilicon,hisi-femac-mdio";
+	reg = <0x10091100 0x10>;
+	clocks = <&crg HI3516CV300_MDIO_CLK>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	phy0: phy@1 {
+		reg = <1>;
+	};
+};

Documentation/devicetree/bindings/net/hisilicon-femac.txt

+Hisilicon Fast Ethernet MAC controller
+
+Required properties:
+- compatible: should contain one of the following version strings:
+	* "hisilicon,hisi-femac-v1"
+	* "hisilicon,hisi-femac-v2"
+	and the soc string "hisilicon,hi3516cv300-femac".
+- reg: specifies base physical address(s) and size of the device registers.
+  The first region is the MAC core register base and size.
+  The second region is the global MAC control register.
+- interrupts: should contain the MAC interrupt.
+- clocks: A phandle to the MAC main clock.
+- resets: should contain the phandle to the MAC reset signal(required) and
+	the PHY reset signal(optional).
+- reset-names: should contain the reset signal name "mac"(required)
+	and "phy"(optional).
+- mac-address: see ethernet.txt [1].
+- phy-mode: see ethernet.txt [1].
+- phy-handle: see ethernet.txt [1].
+- hisilicon,phy-reset-delays-us: triplet of delays if PHY reset signal given.
+	The 1st cell is reset pre-delay in micro seconds.
+	The 2nd cell is reset pulse in micro seconds.
+	The 3rd cell is reset post-delay in micro seconds.
+
+[1] Documentation/devicetree/bindings/net/ethernet.txt
+
+Example:
+	hisi_femac: ethernet@10090000 {
+		compatible = "hisilicon,hi3516cv300-femac","hisilicon,hisi-femac-v2";
+		reg = <0x10090000 0x1000>,<0x10091300 0x200>;
+		interrupts = <12>;
+		clocks = <&crg HI3518EV200_ETH_CLK>;
+		resets = <&crg 0xec 0>,<&crg 0xec 3>;
+		reset-names = "mac","phy";
+		mac-address = [00 00 00 00 00 00];
+		phy-mode = "mii";
+		phy-handle = <&phy0>;
+		hisilicon,phy-reset-delays-us = <10000 20000 20000>;
+	};

drivers/net/ethernet/hisilicon/Kconfig

@@ -23,6 +23,18 @@ config HIX5HD2_GMAC
 	help
 	  This selects the hix5hd2 mac family network device.
 
+config HISI_FEMAC
+	tristate "Hisilicon Fast Ethernet MAC device support"
+	depends on HAS_IOMEM
+	select PHYLIB
+	select RESET_CONTROLLER
+	help
+	  This selects the Hisilicon Fast Ethernet MAC device(FEMAC).
+	  The FEMAC receives and transmits data over Ethernet
+	  ports at 10/100 Mbps in full-duplex or half-duplex mode.
+	  The FEMAC exchanges data with the CPU, and supports
+	  the energy efficient Ethernet (EEE).
+
 config HIP04_ETH
 	tristate "HISILICON P04 Ethernet support"
 	depends on HAS_IOMEM	# For MFD_SYSCON

drivers/net/ethernet/hisilicon/Makefile

@@ -6,3 +6,4 @@ obj-$(CONFIG_HIX5HD2_GMAC) += hix5hd2_gmac.o
 obj-$(CONFIG_HIP04_ETH) += hip04_eth.o
 obj-$(CONFIG_HNS_MDIO) += hns_mdio.o
 obj-$(CONFIG_HNS) += hns/
+obj-$(CONFIG_HISI_FEMAC) += hisi_femac.o

drivers/net/ethernet/hisilicon/hisi_femac.c

+/*
+ * Hisilicon Fast Ethernet MAC Driver
+ *
+ * Copyright (c) 2016 HiSilicon Technologies Co., Ltd.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/circ_buf.h>
+#include <linux/clk.h>
+#include <linux/etherdevice.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of_mdio.h>
+#include <linux/of_net.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+/* MAC control register list */
+#define MAC_PORTSEL			0x0200
+#define MAC_PORTSEL_STAT_CPU		BIT(0)
+#define MAC_PORTSEL_RMII		BIT(1)
+#define MAC_PORTSET			0x0208
+#define MAC_PORTSET_DUPLEX_FULL		BIT(0)
+#define MAC_PORTSET_LINKED		BIT(1)
+#define MAC_PORTSET_SPEED_100M		BIT(2)
+#define MAC_SET				0x0210
+#define MAX_FRAME_SIZE			1600
+#define MAX_FRAME_SIZE_MASK		GENMASK(10, 0)
+#define BIT_PAUSE_EN			BIT(18)
+#define RX_COALESCE_SET			0x0340
+#define RX_COALESCED_FRAME_OFFSET	24
+#define RX_COALESCED_FRAMES		8
+#define RX_COALESCED_TIMER		0x74
+#define QLEN_SET			0x0344
+#define RX_DEPTH_OFFSET			8
+#define MAX_HW_FIFO_DEPTH		64
+#define HW_TX_FIFO_DEPTH		12
+#define HW_RX_FIFO_DEPTH		(MAX_HW_FIFO_DEPTH - HW_TX_FIFO_DEPTH)
+#define IQFRM_DES			0x0354
+#define RX_FRAME_LEN_MASK		GENMASK(11, 0)
+#define IQ_ADDR				0x0358
+#define EQ_ADDR				0x0360
+#define EQFRM_LEN			0x0364
+#define ADDRQ_STAT			0x036C
+#define TX_CNT_INUSE_MASK		GENMASK(5, 0)
+#define BIT_TX_READY			BIT(24)
+#define BIT_RX_READY			BIT(25)
+/* global control register list */
+#define GLB_HOSTMAC_L32			0x0000
+#define GLB_HOSTMAC_H16			0x0004
+#define GLB_SOFT_RESET			0x0008
+#define SOFT_RESET_ALL			BIT(0)
+#define GLB_FWCTRL			0x0010
+#define FWCTRL_VLAN_ENABLE		BIT(0)
+#define FWCTRL_FW2CPU_ENA		BIT(5)
+#define FWCTRL_FWALL2CPU		BIT(7)
+#define GLB_MACTCTRL			0x0014
+#define MACTCTRL_UNI2CPU		BIT(1)
+#define MACTCTRL_MULTI2CPU		BIT(3)
+#define MACTCTRL_BROAD2CPU		BIT(5)
+#define MACTCTRL_MACT_ENA		BIT(7)
+#define GLB_IRQ_STAT			0x0030
+#define GLB_IRQ_ENA			0x0034
+#define IRQ_ENA_PORT0_MASK		GENMASK(7, 0)
+#define IRQ_ENA_PORT0			BIT(18)
+#define IRQ_ENA_ALL			BIT(19)
+#define GLB_IRQ_RAW			0x0038
+#define IRQ_INT_RX_RDY			BIT(0)
+#define IRQ_INT_TX_PER_PACKET		BIT(1)
+#define IRQ_INT_TX_FIFO_EMPTY		BIT(6)
+#define IRQ_INT_MULTI_RXRDY		BIT(7)
+#define DEF_INT_MASK			(IRQ_INT_MULTI_RXRDY | \
+					IRQ_INT_TX_PER_PACKET | \
+					IRQ_INT_TX_FIFO_EMPTY)
+#define GLB_MAC_L32_BASE		0x0100
+#define GLB_MAC_H16_BASE		0x0104
+#define MACFLT_HI16_MASK		GENMASK(15, 0)
+#define BIT_MACFLT_ENA			BIT(17)
+#define BIT_MACFLT_FW2CPU		BIT(21)
+#define GLB_MAC_H16(reg)		(GLB_MAC_H16_BASE + ((reg) * 0x8))
+#define GLB_MAC_L32(reg)		(GLB_MAC_L32_BASE + ((reg) * 0x8))
+#define MAX_MAC_FILTER_NUM		8
+#define MAX_UNICAST_ADDRESSES		2
+#define MAX_MULTICAST_ADDRESSES		(MAX_MAC_FILTER_NUM - \
+					MAX_UNICAST_ADDRESSES)
+/* software tx and rx queue number, should be power of 2 */
+#define TXQ_NUM				64
+#define RXQ_NUM				128
+#define FEMAC_POLL_WEIGHT		16
+
+#define PHY_RESET_DELAYS_PROPERTY	"hisilicon,phy-reset-delays-us"
+
+enum phy_reset_delays {
+	PRE_DELAY,
+	PULSE,
+	POST_DELAY,
+	DELAYS_NUM,
+};
+
+struct hisi_femac_queue {
+	struct sk_buff **skb;
+	dma_addr_t *dma_phys;
+	int num;
+	unsigned int head;
+	unsigned int tail;
+};
+
+struct hisi_femac_priv {
+	void __iomem *port_base;
+	void __iomem *glb_base;
+	struct clk *clk;
+	struct reset_control *mac_rst;
+	struct reset_control *phy_rst;
+	u32 phy_reset_delays[DELAYS_NUM];
+	u32 link_status;
+
+	struct device *dev;
+	struct net_device *ndev;
+
+	struct hisi_femac_queue txq;
+	struct hisi_femac_queue rxq;
+	u32 tx_fifo_used_cnt;
+	struct napi_struct napi;
+};
+
+static void hisi_femac_irq_enable(struct hisi_femac_priv *priv, int irqs)
+{
+	u32 val;
+
+	val = readl(priv->glb_base + GLB_IRQ_ENA);
+	writel(val | irqs, priv->glb_base + GLB_IRQ_ENA);
+}
+
+static void hisi_femac_irq_disable(struct hisi_femac_priv *priv, int irqs)
+{
+	u32 val;
+
+	val = readl(priv->glb_base + GLB_IRQ_ENA);
+	writel(val & (~irqs), priv->glb_base + GLB_IRQ_ENA);
+}
+
+static void hisi_femac_tx_dma_unmap(struct hisi_femac_priv *priv,
+				    struct sk_buff *skb, unsigned int pos)
+{
+	dma_addr_t dma_addr;
+
+	dma_addr = priv->txq.dma_phys[pos];
+	dma_unmap_single(priv->dev, dma_addr, skb->len, DMA_TO_DEVICE);
+}
+
+static void hisi_femac_xmit_reclaim(struct net_device *dev)
+{
+	struct sk_buff *skb;
+	struct hisi_femac_priv *priv = netdev_priv(dev);
+	struct hisi_femac_queue *txq = &priv->txq;
+	unsigned int bytes_compl = 0, pkts_compl = 0;
+	u32 val;
+
+	netif_tx_lock(dev);
+
+	val = readl(priv->port_base + ADDRQ_STAT) & TX_CNT_INUSE_MASK;
+	while (val < priv->tx_fifo_used_cnt) {
+		skb = txq->skb[txq->tail];
+		if (unlikely(!skb)) {
+			netdev_err(dev, "xmitq_cnt_inuse=%d, tx_fifo_used=%d\n",
+				   val, priv->tx_fifo_used_cnt);
+			break;
+		}
+		hisi_femac_tx_dma_unmap(priv, skb, txq->tail);
+		pkts_compl++;
+		bytes_compl += skb->len;
+		dev_kfree_skb_any(skb);
+
+		priv->tx_fifo_used_cnt--;
+
+		val = readl(priv->port_base + ADDRQ_STAT) & TX_CNT_INUSE_MASK;
+		txq->skb[txq->tail] = NULL;
+		txq->tail = (txq->tail + 1) % txq->num;
+	}
+
+	netdev_completed_queue(dev, pkts_compl, bytes_compl);
+
+	if (unlikely(netif_queue_stopped(dev)) && pkts_compl)
+		netif_wake_queue(dev);
+
+	netif_tx_unlock(dev);
+}
+
+static void hisi_femac_adjust_link(struct net_device *dev)
+{
+	struct hisi_femac_priv *priv = netdev_priv(dev);
+	struct phy_device *phy = dev->phydev;
+	u32 status = 0;
+
+	if (phy->link)
+		status |= MAC_PORTSET_LINKED;
+	if (phy->duplex == DUPLEX_FULL)
+		status |= MAC_PORTSET_DUPLEX_FULL;
+	if (phy->speed == SPEED_100)
+		status |= MAC_PORTSET_SPEED_100M;
+
+	if ((status != priv->link_status) &&
+	    ((status | priv->link_status) & MAC_PORTSET_LINKED)) {
+		writel(status, priv->port_base + MAC_PORTSET);
+		priv->link_status = status;
+		phy_print_status(phy);
+	}
+}
+
+static void hisi_femac_rx_refill(struct hisi_femac_priv *priv)
+{
+	struct hisi_femac_queue *rxq = &priv->rxq;
+	struct sk_buff *skb;
+	u32 pos;
+	u32 len = MAX_FRAME_SIZE;
+	dma_addr_t addr;
+
+	pos = rxq->head;
+	while (readl(priv->port_base + ADDRQ_STAT) & BIT_RX_READY) {
+		if (!CIRC_SPACE(pos, rxq->tail, rxq->num))
+			break;
+		if (unlikely(rxq->skb[pos])) {
+			netdev_err(priv->ndev, "err skb[%d]=%p\n",
+				   pos, rxq->skb[pos]);
+			break;
+		}
+		skb = netdev_alloc_skb_ip_align(priv->ndev, len);
+		if (unlikely(!skb))
+			break;
+
+		addr = dma_map_single(priv->dev, skb->data, len,
+				      DMA_FROM_DEVICE);
+		if (dma_mapping_error(priv->dev, addr)) {
+			dev_kfree_skb_any(skb);
+			break;
+		}
+		rxq->dma_phys[pos] = addr;
+		rxq->skb[pos] = skb;
+		writel(addr, priv->port_base + IQ_ADDR);
+		pos = (pos + 1) % rxq->num;
+	}
+	rxq->head = pos;
+}
+
+static int hisi_femac_rx(struct net_device *dev, int limit)
+{
+	struct hisi_femac_priv *priv = netdev_priv(dev);
+	struct hisi_femac_queue *rxq = &priv->rxq;
+	struct sk_buff *skb;
+	dma_addr_t addr;
+	u32 rx_pkt_info, pos, len, rx_pkts_num = 0;
+
+	pos = rxq->tail;
+	while (readl(priv->glb_base + GLB_IRQ_RAW) & IRQ_INT_RX_RDY) {
+		rx_pkt_info = readl(priv->port_base + IQFRM_DES);
+		len = rx_pkt_info & RX_FRAME_LEN_MASK;
+		len -= ETH_FCS_LEN;
+
+		/* tell hardware we will deal with this packet */
+		writel(IRQ_INT_RX_RDY, priv->glb_base + GLB_IRQ_RAW);
+
+		rx_pkts_num++;
+
+		skb = rxq->skb[pos];
+		if (unlikely(!skb)) {
+			netdev_err(dev, "rx skb NULL. pos=%d\n", pos);
+			break;
+		}
+		rxq->skb[pos] = NULL;
+
+		addr = rxq->dma_phys[pos];
+		dma_unmap_single(priv->dev, addr, MAX_FRAME_SIZE,
+				 DMA_FROM_DEVICE);
+		skb_put(skb, len);
+		if (unlikely(skb->len > MAX_FRAME_SIZE)) {
+			netdev_err(dev, "rcv len err, len = %d\n", skb->len);
+			dev->stats.rx_errors++;
+			dev->stats.rx_length_errors++;
+			dev_kfree_skb_any(skb);
+			goto next;
+		}
+
+		skb->protocol = eth_type_trans(skb, dev);
+		napi_gro_receive(&priv->napi, skb);
+		dev->stats.rx_packets++;
+		dev->stats.rx_bytes += skb->len;
+next:
+		pos = (pos + 1) % rxq->num;
+		if (rx_pkts_num >= limit)
+			break;
+	}
+	rxq->tail = pos;
+
+	hisi_femac_rx_refill(priv);
+
+	return rx_pkts_num;
+}
+
+static int hisi_femac_poll(struct napi_struct *napi, int budget)
+{
+	struct hisi_femac_priv *priv = container_of(napi,
+					struct hisi_femac_priv, napi);
+	struct net_device *dev = priv->ndev;
+	int work_done = 0, task = budget;
+	int ints, num;
+
+	do {
+		hisi_femac_xmit_reclaim(dev);
+		num = hisi_femac_rx(dev, task);
+		work_done += num;
+		task -= num;
+		if (work_done >= budget)
+			break;
+
+		ints = readl(priv->glb_base + GLB_IRQ_RAW);
+		writel(ints & DEF_INT_MASK,
+		       priv->glb_base + GLB_IRQ_RAW);
+	} while (ints & DEF_INT_MASK);
+
+	if (work_done < budget) {
+		napi_complete(napi);
+		hisi_femac_irq_enable(priv, DEF_INT_MASK &
+					(~IRQ_INT_TX_PER_PACKET));
+	}
+
+	return work_done;
+}
+
+static irqreturn_t hisi_femac_interrupt(int irq, void *dev_id)
+{
+	int ints;
+	struct net_device *dev = (struct net_device *)dev_id;
+	struct hisi_femac_priv *priv = netdev_priv(dev);
+
+	ints = readl(priv->glb_base + GLB_IRQ_RAW);
+
+	if (likely(ints & DEF_INT_MASK)) {
+		writel(ints & DEF_INT_MASK,
+		       priv->glb_base + GLB_IRQ_RAW);
+		hisi_femac_irq_disable(priv, DEF_INT_MASK);
+		napi_schedule(&priv->napi);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int hisi_femac_init_queue(struct device *dev,
+				 struct hisi_femac_queue *queue,
+				 unsigned int num)
+{
+	queue->skb = devm_kcalloc(dev, num, sizeof(struct sk_buff *),
+				  GFP_KERNEL);
+	if (!queue->skb)
+		return -ENOMEM;
+
+	queue->dma_phys = devm_kcalloc(dev, num, sizeof(dma_addr_t),
+				       GFP_KERNEL);
+	if (!queue->dma_phys)
+		return -ENOMEM;
+
+	queue->num = num;
+	queue->head = 0;
+	queue->tail = 0;
+
+	return 0;
+}
+
+static int hisi_femac_init_tx_and_rx_queues(struct hisi_femac_priv *priv)
+{
+	int ret;
+
+	ret = hisi_femac_init_queue(priv->dev, &priv->txq, TXQ_NUM);
+	if (ret)
+		return ret;
+
+	ret = hisi_femac_init_queue(priv->dev, &priv->rxq, RXQ_NUM);
+	if (ret)
+		return ret;
+
+	priv->tx_fifo_used_cnt = 0;
+
+	return 0;
+}
+
+static void hisi_femac_free_skb_rings(struct hisi_femac_priv *priv)
+{
+	struct hisi_femac_queue *txq = &priv->txq;
+	struct hisi_femac_queue *rxq = &priv->rxq;
+	struct sk_buff *skb;
+	dma_addr_t dma_addr;
+	u32 pos;
+
+	pos = rxq->tail;
+	while (pos != rxq->head) {
+		skb = rxq->skb[pos];
+		if (unlikely(!skb)) {
+			netdev_err(priv->ndev, "NULL rx skb. pos=%d, head=%d\n",
+				   pos, rxq->head);
+			continue;
+		}
+
+		dma_addr = rxq->dma_phys[pos];
+		dma_unmap_single(priv->dev, dma_addr, MAX_FRAME_SIZE,
+				 DMA_FROM_DEVICE);
+
+		dev_kfree_skb_any(skb);
+		rxq->skb[pos] = NULL;
+		pos = (pos + 1) % rxq->num;
+	}
+	rxq->tail = pos;
+
+	pos = txq->tail;
+	while (pos != txq->head) {
+		skb = txq->skb[pos];
+		if (unlikely(!skb)) {
+			netdev_err(priv->ndev, "NULL tx skb. pos=%d, head=%d\n",
+				   pos, txq->head);
+			continue;
+		}
+		hisi_femac_tx_dma_unmap(priv, skb, pos);
+		dev_kfree_skb_any(skb);
+		txq->skb[pos] = NULL;
+		pos = (pos + 1) % txq->num;
+	}
+	txq->tail = pos;
+	priv->tx_fifo_used_cnt = 0;
+}
+
+static int hisi_femac_set_hw_mac_addr(struct hisi_femac_priv *priv,
+				      unsigned char *mac)
+{
+	u32 reg;
+
+	reg = mac[1] | (mac[0] << 8);
+	writel(reg, priv->glb_base + GLB_HOSTMAC_H16);
+
+	reg = mac[5] | (mac[4] << 8) | (mac[3] << 16) | (mac[2] << 24);
+	writel(reg, priv->glb_base + GLB_HOSTMAC_L32);
+
+	return 0;
+}
+
+static int hisi_femac_port_reset(struct hisi_femac_priv *priv)
+{
+	u32 val;
+
+	val = readl(priv->glb_base + GLB_SOFT_RESET);
+	val |= SOFT_RESET_ALL;
+	writel(val, priv->glb_base + GLB_SOFT_RESET);
+
+	usleep_range(500, 800);
+
+	val &= ~SOFT_RESET_ALL;
+	writel(val, priv->glb_base + GLB_SOFT_RESET);
+
+	return 0;
+}
+
+static int hisi_femac_net_open(struct net_device *dev)
+{
+	struct hisi_femac_priv *priv = netdev_priv(dev);
+
+	hisi_femac_port_reset(priv);
+	hisi_femac_set_hw_mac_addr(priv, dev->dev_addr);
+	hisi_femac_rx_refill(priv);
+
+	netif_carrier_off(dev);
+	netdev_reset_queue(dev);
+	netif_start_queue(dev);
+	napi_enable(&priv->napi);
+
+	priv->link_status = 0;
+	if (dev->phydev)
+		phy_start(dev->phydev);
+
+	writel(IRQ_ENA_PORT0_MASK, priv->glb_base + GLB_IRQ_RAW);
+	hisi_femac_irq_enable(priv, IRQ_ENA_ALL | IRQ_ENA_PORT0 | DEF_INT_MASK);
+
+	return 0;
+}
+
+static int hisi_femac_net_close(struct net_device *dev)
+{
+	struct hisi_femac_priv *priv = netdev_priv(dev);
+
+	hisi_femac_irq_disable(priv, IRQ_ENA_PORT0);
+
+	if (dev->phydev)
+		phy_stop(dev->phydev);
+
+	netif_stop_queue(dev);
+	napi_disable(&priv->napi);
+
+	hisi_femac_free_skb_rings(priv);
+
+	return 0;
+}
+
+static netdev_tx_t hisi_femac_net_xmit(struct sk_buff *skb,
+				       struct net_device *dev)
+{
+	struct hisi_femac_priv *priv = netdev_priv(dev);
+	struct hisi_femac_queue *txq = &priv->txq;
+	dma_addr_t addr;
+	u32 val;
+
+	val = readl(priv->port_base + ADDRQ_STAT);
+	val &= BIT_TX_READY;
+	if (!val) {
+		hisi_femac_irq_enable(priv, IRQ_INT_TX_PER_PACKET);
+		dev->stats.tx_dropped++;
+		dev->stats.tx_fifo_errors++;
+		netif_stop_queue(dev);
+		return NETDEV_TX_BUSY;
+	}
+
+	if (unlikely(!CIRC_SPACE(txq->head, txq->tail,
+				 txq->num))) {
+		hisi_femac_irq_enable(priv, IRQ_INT_TX_PER_PACKET);
+		dev->stats.tx_dropped++;
+		dev->stats.tx_fifo_errors++;
+		netif_stop_queue(dev);
+		return NETDEV_TX_BUSY;
+	}
+
+	addr = dma_map_single(priv->dev, skb->data,
+			      skb->len, DMA_TO_DEVICE);
+	if (unlikely(dma_mapping_error(priv->dev, addr))) {
+		dev_kfree_skb_any(skb);
+		dev->stats.tx_dropped++;
+		return NETDEV_TX_OK;
+	}
+	txq->dma_phys[txq->head] = addr;
+
+	txq->skb[txq->head] = skb;
+	txq->head = (txq->head + 1) % txq->num;
+
+	writel(addr, priv->port_base + EQ_ADDR);
+	writel(skb->len + ETH_FCS_LEN, priv->port_base + EQFRM_LEN);
+
+	priv->tx_fifo_used_cnt++;
+
+	dev->stats.tx_packets++;
+	dev->stats.tx_bytes += skb->len;
+	netdev_sent_queue(dev, skb->len);
+
+	return NETDEV_TX_OK;
+}
+
+static int hisi_femac_set_mac_address(struct net_device *dev, void *p)
+{
+	struct hisi_femac_priv *priv = netdev_priv(dev);
+	struct sockaddr *skaddr = p;
+
+	if (!is_valid_ether_addr(skaddr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	memcpy(dev->dev_addr, skaddr->sa_data, dev->addr_len);
+	dev->addr_assign_type &= ~NET_ADDR_RANDOM;
+
+	hisi_femac_set_hw_mac_addr(priv, dev->dev_addr);
+
+	return 0;
+}
+
+static void hisi_femac_enable_hw_addr_filter(struct hisi_femac_priv *priv,
+					     unsigned int reg_n, bool enable)
+{
+	u32 val;
+
+	val = readl(priv->glb_base + GLB_MAC_H16(reg_n));
+	if (enable)
+		val |= BIT_MACFLT_ENA;
+	else
+		val &= ~BIT_MACFLT_ENA;
+	writel(val, priv->glb_base + GLB_MAC_H16(reg_n));
+}
+
+static void hisi_femac_set_hw_addr_filter(struct hisi_femac_priv *priv,
+					  unsigned char *addr,
+					  unsigned int reg_n)
+{
+	unsigned int high, low;
+	u32 val;
+
+	high = GLB_MAC_H16(reg_n);
+	low = GLB_MAC_L32(reg_n);
+
+	val = (addr[2] << 24) | (addr[3] << 16) | (addr[4] << 8) | addr[5];
+	writel(val, priv->glb_base + low);
+
+	val = readl(priv->glb_base + high);
+	val &= ~MACFLT_HI16_MASK;
+	val |= ((addr[0] << 8) | addr[1]);
+	val |= (BIT_MACFLT_ENA | BIT_MACFLT_FW2CPU);
+	writel(val, priv->glb_base + high);
+}
+
+static void hisi_femac_set_promisc_mode(struct hisi_femac_priv *priv,
+					bool promisc_mode)
+{
+	u32 val;
+
+	val = readl(priv->glb_base + GLB_FWCTRL);
+	if (promisc_mode)
+		val |= FWCTRL_FWALL2CPU;
+	else
+		val &= ~FWCTRL_FWALL2CPU;
+	writel(val, priv->glb_base + GLB_FWCTRL);
+}
+
+/* Handle multiple multicast addresses (perfect filtering)*/
+static void hisi_femac_set_mc_addr_filter(struct hisi_femac_priv *priv)
+{
+	struct net_device *dev = priv->ndev;
+	u32 val;
+
+	val = readl(priv->glb_base + GLB_MACTCTRL);
+	if ((netdev_mc_count(dev) > MAX_MULTICAST_ADDRESSES) ||
+	    (dev->flags & IFF_ALLMULTI)) {
+		val |= MACTCTRL_MULTI2CPU;
+	} else {
+		int reg = MAX_UNICAST_ADDRESSES;
+		int i;
+		struct netdev_hw_addr *ha;
+
+		for (i = reg; i < MAX_MAC_FILTER_NUM; i++)
+			hisi_femac_enable_hw_addr_filter(priv, i, false);
+
+		netdev_for_each_mc_addr(ha, dev) {
+			hisi_femac_set_hw_addr_filter(priv, ha->addr, reg);
+			reg++;
+		}
+		val &= ~MACTCTRL_MULTI2CPU;
+	}
+	writel(val, priv->glb_base + GLB_MACTCTRL);
+}
+
+/* Handle multiple unicast addresses (perfect filtering)*/
+static void hisi_femac_set_uc_addr_filter(struct hisi_femac_priv *priv)
+{
+	struct net_device *dev = priv->ndev;
+	u32 val;
+
+	val = readl(priv->glb_base + GLB_MACTCTRL);
+	if (netdev_uc_count(dev) > MAX_UNICAST_ADDRESSES) {
+		val |= MACTCTRL_UNI2CPU;
+	} else {
+		int reg = 0;
+		int i;
+		struct netdev_hw_addr *ha;
+
+		for (i = reg; i < MAX_UNICAST_ADDRESSES; i++)
+			hisi_femac_enable_hw_addr_filter(priv, i, false);
+
+		netdev_for_each_uc_addr(ha, dev) {
+			hisi_femac_set_hw_addr_filter(priv, ha->addr, reg);
+			reg++;
+		}
+		val &= ~MACTCTRL_UNI2CPU;
+	}
+	writel(val, priv->glb_base + GLB_MACTCTRL);
+}
+
+static void hisi_femac_net_set_rx_mode(struct net_device *dev)
+{
+	struct hisi_femac_priv *priv = netdev_priv(dev);
+
+	if (dev->flags & IFF_PROMISC) {
+		hisi_femac_set_promisc_mode(priv, true);
+	} else {
+		hisi_femac_set_promisc_mode(priv, false);
+		hisi_femac_set_mc_addr_filter(priv);
+		hisi_femac_set_uc_addr_filter(priv);
+	}
+}
+
+static int hisi_femac_net_ioctl(struct net_device *dev,
+				struct ifreq *ifreq, int cmd)
+{
+	if (!netif_running(dev))
+		return -EINVAL;
+
+	if (!dev->phydev)
+		return -EINVAL;
+
+	return phy_mii_ioctl(dev->phydev, ifreq, cmd);
+}
+
+static struct ethtool_ops hisi_femac_ethtools_ops = {
+	.get_link		= ethtool_op_get_link,
+	.get_link_ksettings	= phy_ethtool_get_link_ksettings,
+	.set_link_ksettings	= phy_ethtool_set_link_ksettings,
+};
+
+static const struct net_device_ops hisi_femac_netdev_ops = {
+	.ndo_open		= hisi_femac_net_open,
+	.ndo_stop		= hisi_femac_net_close,
+	.ndo_start_xmit		= hisi_femac_net_xmit,
+	.ndo_do_ioctl		= hisi_femac_net_ioctl,
+	.ndo_set_mac_address	= hisi_femac_set_mac_address,
+	.ndo_set_rx_mode	= hisi_femac_net_set_rx_mode,
+	.ndo_change_mtu		= eth_change_mtu,
+};
+
+static void hisi_femac_core_reset(struct hisi_femac_priv *priv)
+{
+	reset_control_assert(priv->mac_rst);
+	reset_control_deassert(priv->mac_rst);
+}
+
+static void hisi_femac_sleep_us(u32 time_us)
+{
+	u32 time_ms;
+
+	if (!time_us)
+		return;
+
+	time_ms = DIV_ROUND_UP(time_us, 1000);
+	if (time_ms < 20)
+		usleep_range(time_us, time_us + 500);
+	else
+		msleep(time_ms);
+}
+
+static void hisi_femac_phy_reset(struct hisi_femac_priv *priv)
+{
+	/* To make sure PHY hardware reset success,
+	 * we must keep PHY in deassert state first and
+	 * then complete the hardware reset operation
+	 */
+	reset_control_deassert(priv->phy_rst);
+	hisi_femac_sleep_us(priv->phy_reset_delays[PRE_DELAY]);
+
+	reset_control_assert(priv->phy_rst);
+	/* delay some time to ensure reset ok,
+	 * this depends on PHY hardware feature
+	 */
+	hisi_femac_sleep_us(priv->phy_reset_delays[PULSE]);
+	reset_control_deassert(priv->phy_rst);
+	/* delay some time to ensure later MDIO access */
+	hisi_femac_sleep_us(priv->phy_reset_delays[POST_DELAY]);
+}
+
+static void hisi_femac_port_init(struct hisi_femac_priv *priv)
+{
+	u32 val;
+
+	/* MAC gets link status info and phy mode by software config */
+	val = MAC_PORTSEL_STAT_CPU;
+	if (priv->ndev->phydev->interface == PHY_INTERFACE_MODE_RMII)
+		val |= MAC_PORTSEL_RMII;
+	writel(val, priv->port_base + MAC_PORTSEL);
+
+	/*clear all interrupt status */
+	writel(IRQ_ENA_PORT0_MASK, priv->glb_base + GLB_IRQ_RAW);
+	hisi_femac_irq_disable(priv, IRQ_ENA_PORT0_MASK | IRQ_ENA_PORT0);
+
+	val = readl(priv->glb_base + GLB_FWCTRL);
+	val &= ~(FWCTRL_VLAN_ENABLE | FWCTRL_FWALL2CPU);
+	val |= FWCTRL_FW2CPU_ENA;
+	writel(val, priv->glb_base + GLB_FWCTRL);
+
+	val = readl(priv->glb_base + GLB_MACTCTRL);
+	val |= (MACTCTRL_BROAD2CPU | MACTCTRL_MACT_ENA);
+	writel(val, priv->glb_base + GLB_MACTCTRL);
+
+	val = readl(priv->port_base + MAC_SET);
+	val &= ~MAX_FRAME_SIZE_MASK;
+	val |= MAX_FRAME_SIZE;
+	writel(val, priv->port_base + MAC_SET);
+
+	val = RX_COALESCED_TIMER |
+		(RX_COALESCED_FRAMES << RX_COALESCED_FRAME_OFFSET);
+	writel(val, priv->port_base + RX_COALESCE_SET);
+
+	val = (HW_RX_FIFO_DEPTH << RX_DEPTH_OFFSET) | HW_TX_FIFO_DEPTH;
+	writel(val, priv->port_base + QLEN_SET);
+}
+
+static int hisi_femac_drv_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *node = dev->of_node;
+	struct resource *res;
+	struct net_device *ndev;
+	struct hisi_femac_priv *priv;
+	struct phy_device *phy;
+	const char *mac_addr;
+	int ret;
+
+	ndev = alloc_etherdev(sizeof(*priv));
+	if (!ndev)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, ndev);
+
+	priv = netdev_priv(ndev);
+	priv->dev = dev;
+	priv->ndev = ndev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	priv->port_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(priv->port_base)) {
+		ret = PTR_ERR(priv->port_base);
+		goto out_free_netdev;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	priv->glb_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(priv->glb_base)) {
+		ret = PTR_ERR(priv->glb_base);
+		goto out_free_netdev;
+	}
+
+	priv->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(priv->clk)) {
+		dev_err(dev, "failed to get clk\n");
+		ret = -ENODEV;
+		goto out_free_netdev;
+	}
+
+	ret = clk_prepare_enable(priv->clk);
+	if (ret) {
+		dev_err(dev, "failed to enable clk %d\n", ret);
+		goto out_free_netdev;
+	}
+
+	priv->mac_rst = devm_reset_control_get(dev, "mac");
+	if (IS_ERR(priv->mac_rst)) {
+		ret = PTR_ERR(priv->mac_rst);
+		goto out_disable_clk;
+	}
+	hisi_femac_core_reset(priv);
+
+	priv->phy_rst = devm_reset_control_get(dev, "phy");
+	if (IS_ERR(priv->phy_rst)) {
+		priv->phy_rst = NULL;
+	} else {
+		ret = of_property_read_u32_array(node,
+						 PHY_RESET_DELAYS_PROPERTY,
+						 priv->phy_reset_delays,
+						 DELAYS_NUM);
+		if (ret)
+			goto out_disable_clk;
+		hisi_femac_phy_reset(priv);
+	}
+
+	phy = of_phy_get_and_connect(ndev, node, hisi_femac_adjust_link);
+	if (!phy) {
+		dev_err(dev, "connect to PHY failed!\n");
+		ret = -ENODEV;
+		goto out_disable_clk;
+	}
+
+	phy_attached_print(phy, "phy_id=0x%.8lx, phy_mode=%s\n",
+			   (unsigned long)phy->phy_id,
+			   phy_modes(phy->interface));
+
+	mac_addr = of_get_mac_address(node);
+	if (mac_addr)
+		ether_addr_copy(ndev->dev_addr, mac_addr);
+	if (!is_valid_ether_addr(ndev->dev_addr)) {
+		eth_hw_addr_random(ndev);
+		dev_warn(dev, "using random MAC address %pM\n",
+			 ndev->dev_addr);
+	}
+
+	ndev->watchdog_timeo = 6 * HZ;
+	ndev->priv_flags |= IFF_UNICAST_FLT;
+	ndev->netdev_ops = &hisi_femac_netdev_ops;
+	ndev->ethtool_ops = &hisi_femac_ethtools_ops;
+	netif_napi_add(ndev, &priv->napi, hisi_femac_poll, FEMAC_POLL_WEIGHT);
+	SET_NETDEV_DEV(ndev, &pdev->dev);
+
+	hisi_femac_port_init(priv);
+
+	ret = hisi_femac_init_tx_and_rx_queues(priv);
+	if (ret)
+		goto out_disconnect_phy;
+
+	ndev->irq = platform_get_irq(pdev, 0);
+	if (ndev->irq <= 0) {
+		dev_err(dev, "No irq resource\n");
+		ret = -ENODEV;
+		goto out_disconnect_phy;
+	}
+
+	ret = devm_request_irq(dev, ndev->irq, hisi_femac_interrupt,
+			       IRQF_SHARED, pdev->name, ndev);
+	if (ret) {
+		dev_err(dev, "devm_request_irq %d failed!\n", ndev->irq);
+		goto out_disconnect_phy;
+	}
+
+	ret = register_netdev(ndev);
+	if (ret) {
+		dev_err(dev, "register_netdev failed!\n");
+		goto out_disconnect_phy;
+	}
+
+	return ret;
+
+out_disconnect_phy:
+	netif_napi_del(&priv->napi);
+	phy_disconnect(phy);
+out_disable_clk:
+	clk_disable_unprepare(priv->clk);
+out_free_netdev:
+	free_netdev(ndev);
+
+	return ret;
+}
+
+static int hisi_femac_drv_remove(struct platform_device *pdev)
+{
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct hisi_femac_priv *priv = netdev_priv(ndev);
+
+	netif_napi_del(&priv->napi);
+	unregister_netdev(ndev);
+
+	phy_disconnect(ndev->phydev);
+	clk_disable_unprepare(priv->clk);
+	free_netdev(ndev);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+int hisi_femac_drv_suspend(struct platform_device *pdev,
+			   pm_message_t state)
+{
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct hisi_femac_priv *priv = netdev_priv(ndev);
+
+	disable_irq(ndev->irq);
+	if (netif_running(ndev)) {
+		hisi_femac_net_close(ndev);
+		netif_device_detach(ndev);
+	}
+
+	clk_disable_unprepare(priv->clk);
+
+	return 0;
+}
+
+int hisi_femac_drv_resume(struct platform_device *pdev)
+{
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct hisi_femac_priv *priv = netdev_priv(ndev);
+
+	clk_prepare_enable(priv->clk);
+	if (priv->phy_rst)
+		hisi_femac_phy_reset(priv);
+
+	if (netif_running(ndev)) {
+		hisi_femac_port_init(priv);
+		hisi_femac_net_open(ndev);
+		netif_device_attach(ndev);
+	}
+	enable_irq(ndev->irq);
+
+	return 0;
+}
+#endif
+
+static const struct of_device_id hisi_femac_match[] = {
+	{.compatible = "hisilicon,hisi-femac-v1",},
+	{.compatible = "hisilicon,hisi-femac-v2",},
+	{.compatible = "hisilicon,hi3516cv300-femac",},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, hisi_femac_match);
+
+static struct platform_driver hisi_femac_driver = {
+	.driver = {
+		.name = "hisi-femac",
+		.of_match_table = hisi_femac_match,
+	},
+	.probe = hisi_femac_drv_probe,
+	.remove = hisi_femac_drv_remove,
+#ifdef CONFIG_PM
+	.suspend = hisi_femac_drv_suspend,
+	.resume = hisi_femac_drv_resume,
+#endif
+};
+
+module_platform_driver(hisi_femac_driver);
+
+MODULE_DESCRIPTION("Hisilicon Fast Ethernet MAC driver");
+MODULE_AUTHOR("Dongpo Li <lidongpo@hisilicon.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:hisi-femac");

drivers/net/phy/Kconfig

@@ -294,6 +294,13 @@ config INTEL_XWAY_PHY
 	  PEF 7061, PEF 7071 and PEF 7072 or integrated into the Intel
 	  SoCs xRX200, xRX300, xRX330, xRX350 and xRX550.
 
+config MDIO_HISI_FEMAC
+	tristate "Hisilicon FEMAC MDIO bus controller"
+	depends on HAS_IOMEM && OF_MDIO
+	help
+	  This module provides a driver for the MDIO busses found in the
+	  Hisilicon SoC that have an Fast Ethernet MAC.
+
 endif # PHYLIB
 
 config MICREL_KS8995MA

drivers/net/phy/Makefile

@@ -47,3 +47,4 @@ obj-$(CONFIG_MDIO_BCM_UNIMAC)	+= mdio-bcm-unimac.o
 obj-$(CONFIG_MICROCHIP_PHY)	+= microchip.o
 obj-$(CONFIG_MDIO_BCM_IPROC)	+= mdio-bcm-iproc.o
 obj-$(CONFIG_INTEL_XWAY_PHY)	+= intel-xway.o
+obj-$(CONFIG_MDIO_HISI_FEMAC)	+= mdio-hisi-femac.o

drivers/net/phy/mdio-hisi-femac.c

+/*
+ * Hisilicon Fast Ethernet MDIO Bus Driver
+ *
+ * Copyright (c) 2016 HiSilicon Technologies Co., Ltd.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_mdio.h>
+#include <linux/platform_device.h>
+
+#define MDIO_RWCTRL		0x00
+#define MDIO_RO_DATA		0x04
+#define MDIO_WRITE		BIT(13)
+#define MDIO_RW_FINISH		BIT(15)
+#define BIT_PHY_ADDR_OFFSET	8
+#define BIT_WR_DATA_OFFSET	16
+
+struct hisi_femac_mdio_data {
+	struct clk *clk;
+	void __iomem *membase;
+};
+
+static int hisi_femac_mdio_wait_ready(struct hisi_femac_mdio_data *data)
+{
+	u32 val;
+
+	return readl_poll_timeout(data->membase + MDIO_RWCTRL,
+				  val, val & MDIO_RW_FINISH, 20, 10000);
+}
+
+static int hisi_femac_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
+{
+	struct hisi_femac_mdio_data *data = bus->priv;
+	int ret;
+
+	ret = hisi_femac_mdio_wait_ready(data);
+	if (ret)
+		return ret;
+
+	writel((mii_id << BIT_PHY_ADDR_OFFSET) | regnum,
+	       data->membase + MDIO_RWCTRL);
+
+	ret = hisi_femac_mdio_wait_ready(data);
+	if (ret)
+		return ret;
+
+	return readl(data->membase + MDIO_RO_DATA) & 0xFFFF;
+}
+
+static int hisi_femac_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
+				 u16 value)
+{
+	struct hisi_femac_mdio_data *data = bus->priv;
+	int ret;
+
+	ret = hisi_femac_mdio_wait_ready(data);
+	if (ret)
+		return ret;
+
+	writel(MDIO_WRITE | (value << BIT_WR_DATA_OFFSET) |
+	       (mii_id << BIT_PHY_ADDR_OFFSET) | regnum,
+	       data->membase + MDIO_RWCTRL);
+
+	return hisi_femac_mdio_wait_ready(data);
+}
+
+static int hisi_femac_mdio_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct mii_bus *bus;
+	struct hisi_femac_mdio_data *data;
+	struct resource *res;
+	int ret;
+
+	bus = mdiobus_alloc_size(sizeof(*data));
+	if (!bus)
+		return -ENOMEM;
+
+	bus->name = "hisi_femac_mii_bus";
+	bus->read = &hisi_femac_mdio_read;
+	bus->write = &hisi_femac_mdio_write;
+	snprintf(bus->id, MII_BUS_ID_SIZE, "%s", pdev->name);
+	bus->parent = &pdev->dev;
+
+	data = bus->priv;
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	data->membase = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(data->membase)) {
+		ret = PTR_ERR(data->membase);
+		goto err_out_free_mdiobus;
+	}
+
+	data->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(data->clk)) {
+		ret = PTR_ERR(data->clk);
+		goto err_out_free_mdiobus;
+	}
+
+	ret = clk_prepare_enable(data->clk);
+	if (ret)
+		goto err_out_free_mdiobus;
+
+	ret = of_mdiobus_register(bus, np);
+	if (ret)
+		goto err_out_disable_clk;
+
+	platform_set_drvdata(pdev, bus);
+
+	return 0;
+
+err_out_disable_clk:
+	clk_disable_unprepare(data->clk);
+err_out_free_mdiobus:
+	mdiobus_free(bus);
+	return ret;
+}
+
+static int hisi_femac_mdio_remove(struct platform_device *pdev)
+{
+	struct mii_bus *bus = platform_get_drvdata(pdev);
+	struct hisi_femac_mdio_data *data = bus->priv;
+
+	mdiobus_unregister(bus);
+	clk_disable_unprepare(data->clk);
+	mdiobus_free(bus);
+
+	return 0;
+}
+
+static const struct of_device_id hisi_femac_mdio_dt_ids[] = {
+	{ .compatible = "hisilicon,hisi-femac-mdio" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, hisi_femac_mdio_dt_ids);
+
+static struct platform_driver hisi_femac_mdio_driver = {
+	.probe = hisi_femac_mdio_probe,
+	.remove = hisi_femac_mdio_remove,
+	.driver = {
+		.name = "hisi-femac-mdio",
+		.of_match_table = hisi_femac_mdio_dt_ids,
+	},
+};
+
+module_platform_driver(hisi_femac_mdio_driver);
+
+MODULE_DESCRIPTION("Hisilicon Fast Ethernet MAC MDIO interface driver");
+MODULE_AUTHOR("Dongpo Li <lidongpo@hisilicon.com>");
+MODULE_LICENSE("GPL v2");

drivers/of/of_mdio.c

@@ -19,6 +19,7 @@
 #include <linux/of_gpio.h>
 #include <linux/of_irq.h>
 #include <linux/of_mdio.h>
+#include <linux/of_net.h>
 #include <linux/module.h>
 
 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
@@ -331,6 +332,41 @@ struct phy_device *of_phy_connect(struct net_device *dev,
 }
 EXPORT_SYMBOL(of_phy_connect);
 
+/**
+ * of_phy_get_and_connect
+ * - Get phy node and connect to the phy described in the device tree
+ * @dev: pointer to net_device claiming the phy
+ * @np: Pointer to device tree node for the net_device claiming the phy
+ * @hndlr: Link state callback for the network device
+ *
+ * If successful, returns a pointer to the phy_device with the embedded
+ * struct device refcount incremented by one, or NULL on failure. The
+ * refcount must be dropped by calling phy_disconnect() or phy_detach().
+ */
+struct phy_device *of_phy_get_and_connect(struct net_device *dev,
+					  struct device_node *np,
+					  void (*hndlr)(struct net_device *))
+{
+	phy_interface_t iface;
+	struct device_node *phy_np;
+	struct phy_device *phy;
+
+	iface = of_get_phy_mode(np);
+	if (iface < 0)
+		return NULL;
+
+	phy_np = of_parse_phandle(np, "phy-handle", 0);
+	if (!phy_np)
+		return NULL;
+
+	phy = of_phy_connect(dev, phy_np, hndlr, 0, iface);
+
+	of_node_put(phy_np);
+
+	return phy;
+}
+EXPORT_SYMBOL(of_phy_get_and_connect);
+
 /**
  * of_phy_attach - Attach to a PHY without starting the state machine
  * @dev: pointer to net_device claiming the phy

include/linux/of_mdio.h

@@ -19,6 +19,9 @@ extern struct phy_device *of_phy_connect(struct net_device *dev,
 					 struct device_node *phy_np,
 					 void (*hndlr)(struct net_device *),
 					 u32 flags, phy_interface_t iface);
+extern struct phy_device *
+of_phy_get_and_connect(struct net_device *dev, struct device_node *np,
+		       void (*hndlr)(struct net_device *));
 struct phy_device *of_phy_attach(struct net_device *dev,
 				 struct device_node *phy_np, u32 flags,
 				 phy_interface_t iface);
@@ -52,6 +55,13 @@ static inline struct phy_device *of_phy_connect(struct net_device *dev,
 	return NULL;
 }
 
+static inline struct phy_device *
+of_phy_get_and_connect(struct net_device *dev, struct device_node *np,
+		       void (*hndlr)(struct net_device *))
+{
+	return NULL;
+}
+
 static inline struct phy_device *of_phy_attach(struct net_device *dev,
 					       struct device_node *phy_np,
 					       u32 flags, phy_interface_t iface)