[PATCH v1 1/3] net: ath79: add ag71xx Ethernet driver

[Oleksij Rempel <linux@rempel-privat.de>]

From: Yegor Yefremov <yegorslists@googlemail.com>

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/mips/mach-ath79/include/mach/ar71xx_regs.h |  12 +
 drivers/net/Kconfig                             |   7 +
 drivers/net/Makefile                            |   1 +
 drivers/net/ag71xx.c                            | 530 ++++++++++++++++++++++++
 4 files changed, 550 insertions(+)
 create mode 100644 drivers/net/ag71xx.c

diff --git a/arch/mips/mach-ath79/include/mach/ar71xx_regs.h b/arch/mips/mach-ath79/include/mach/ar71xx_regs.h
index f56c3f724..31d33b3c4 100644
--- a/arch/mips/mach-ath79/include/mach/ar71xx_regs.h
+++ b/arch/mips/mach-ath79/include/mach/ar71xx_regs.h
@@ -102,6 +102,8 @@
 #define AR933X_PLL_CLOCK_CTRL_REG	0x08
 #define AR933X_PLL_DITHER_FRAC_REG	0x10
 #define AR933X_PLL_DITHER_REG		0x14
+#define AR933X_ETHSW_CLOCK_CONTROL_REG	0x24
+#define AR933X_ETH_XMII_CONTROL_REG	0x2c
 
 #define AR933X_PLL_CPU_CONFIG_NINT_SHIFT	10
 #define AR933X_PLL_CPU_CONFIG_NINT_MASK		0x3f
@@ -125,6 +127,16 @@
 #define AR933X_RESET_REG_RESET_MODULE		0x1c
 #define AR933X_RESET_REG_BOOTSTRAP		0xac
 
+#define AR933X_RESET_GE1_MDIO           BIT(23)
+#define AR933X_RESET_GE0_MDIO           BIT(22)
+#define AR933X_RESET_GE1_MAC            BIT(13)
+#define AR933X_RESET_WMAC               BIT(11)
+#define AR933X_RESET_GE0_MAC            BIT(9)
+#define AR933X_RESET_SWITCH             BIT(8)
+#define AR933X_RESET_USB_HOST           BIT(5)
+#define AR933X_RESET_USB_PHY            BIT(4)
+#define AR933X_RESET_USBSUS_OVERRIDE    BIT(3)
+
 #define AR71XX_RESET_FULL_CHIP		BIT(24)
 
 #define AR933X_BOOTSTRAP_REF_CLK_40	BIT(0)
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index c3980e78f..9d69b6aeb 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -204,6 +204,13 @@ config DRIVER_NET_EFI_SNP
 	bool "EFI SNP ethernet driver"
 	depends on EFI_BOOTUP
 
+config DRIVER_NET_AG71XX
+	bool "Atheros AG71xx ethernet driver"
+	depends on MACH_MIPS_ATH79
+	select PHYLIB
+	help
+	  This option enables support for Atheros AG71XX ethernet chip.
+
 config DRIVER_NET_TSE
 	depends on NIOS2
 	bool "Altera TSE ethernet driver"
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 42ea208e3..86c8ac32f 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -30,3 +30,4 @@ obj-$(CONFIG_DRIVER_NET_SMC91111)	+= smc91111.o
 obj-$(CONFIG_DRIVER_NET_TAP)		+= tap.o
 obj-$(CONFIG_DRIVER_NET_TSE)		+= altera_tse.o
 obj-$(CONFIG_DRIVER_NET_EFI_SNP)	+= efi-snp.o
+obj-$(CONFIG_DRIVER_NET_AG71XX)		+= ag71xx.o
diff --git a/drivers/net/ag71xx.c b/drivers/net/ag71xx.c
new file mode 100644
index 000000000..b2e066be3
--- /dev/null
+++ b/drivers/net/ag71xx.c
@@ -0,0 +1,530 @@
+/*
+ *  Atheros AR71xx built-in ethernet mac driver
+ *
+ *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
+ *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ *
+ *  Based on Atheros' AG7100 driver
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ */
+
+#include <common.h>
+#include <net.h>
+#include <dma.h>
+#include <init.h>
+#include <io.h>
+#include <linux/err.h>
+#include <linux/phy.h>
+#include <of_net.h>
+#include <of_address.h>
+
+#include <mach/ath79.h>
+
+/* Register offsets */
+#define AG71XX_REG_MAC_CFG1	0x0000
+#define AG71XX_REG_MAC_CFG2	0x0004
+#define AG71XX_REG_MAC_IPG	0x0008
+#define AG71XX_REG_MAC_HDX	0x000c
+#define AG71XX_REG_MAC_MFL	0x0010
+#define AG71XX_REG_MII_CFG	0x0020
+#define AG71XX_REG_MII_CMD	0x0024
+#define AG71XX_REG_MII_ADDR	0x0028
+#define AG71XX_REG_MII_CTRL	0x002c
+#define AG71XX_REG_MII_STATUS	0x0030
+#define AG71XX_REG_MII_IND	0x0034
+#define AG71XX_REG_MAC_IFCTL	0x0038
+#define AG71XX_REG_MAC_ADDR1	0x0040
+#define AG71XX_REG_MAC_ADDR2	0x0044
+#define AG71XX_REG_FIFO_CFG0	0x0048
+#define AG71XX_REG_FIFO_CFG1	0x004c
+#define AG71XX_REG_FIFO_CFG2	0x0050
+#define AG71XX_REG_FIFO_CFG3	0x0054
+#define AG71XX_REG_FIFO_CFG4	0x0058
+#define AG71XX_REG_FIFO_CFG5	0x005c
+#define AG71XX_REG_FIFO_RAM0	0x0060
+#define AG71XX_REG_FIFO_RAM1	0x0064
+#define AG71XX_REG_FIFO_RAM2	0x0068
+#define AG71XX_REG_FIFO_RAM3	0x006c
+#define AG71XX_REG_FIFO_RAM4	0x0070
+#define AG71XX_REG_FIFO_RAM5	0x0074
+#define AG71XX_REG_FIFO_RAM6	0x0078
+#define AG71XX_REG_FIFO_RAM7	0x007c
+
+#define AG71XX_REG_TX_CTRL	0x0180
+#define AG71XX_REG_TX_DESC	0x0184
+#define AG71XX_REG_TX_STATUS	0x0188
+#define AG71XX_REG_RX_CTRL	0x018c
+#define AG71XX_REG_RX_DESC	0x0190
+#define AG71XX_REG_RX_STATUS	0x0194
+#define AG71XX_REG_INT_ENABLE	0x0198
+#define AG71XX_REG_INT_STATUS	0x019c
+
+#define AG71XX_REG_FIFO_DEPTH	0x01a8
+#define AG71XX_REG_RX_SM	0x01b0
+#define AG71XX_REG_TX_SM	0x01b4
+
+#define MAC_CFG1_TXE		BIT(0)	/* Tx Enable */
+#define MAC_CFG1_STX		BIT(1)	/* Synchronize Tx Enable */
+#define MAC_CFG1_RXE		BIT(2)	/* Rx Enable */
+#define MAC_CFG1_SRX		BIT(3)	/* Synchronize Rx Enable */
+#define MAC_CFG1_TFC		BIT(4)	/* Tx Flow Control Enable */
+#define MAC_CFG1_RFC		BIT(5)	/* Rx Flow Control Enable */
+#define MAC_CFG1_LB		BIT(8)	/* Loopback mode */
+#define MAC_CFG1_TX_RST		BIT(18)	/* Tx Reset */
+#define MAC_CFG1_RX_RST		BIT(19)	/* Rx Reset */
+#define MAC_CFG1_SR		BIT(31)	/* Soft Reset */
+
+#define MAC_CFG2_FDX		BIT(0)
+#define MAC_CFG2_CRC_EN		BIT(1)
+#define MAC_CFG2_PAD_CRC_EN	BIT(2)
+#define MAC_CFG2_LEN_CHECK	BIT(4)
+#define MAC_CFG2_HUGE_FRAME_EN	BIT(5)
+#define MAC_CFG2_IF_1000	BIT(9)
+#define MAC_CFG2_IF_10_100	BIT(8)
+
+#define FIFO_CFG0_WTM		BIT(0)	/* Watermark Module */
+#define FIFO_CFG0_RXS		BIT(1)	/* Rx System Module */
+#define FIFO_CFG0_RXF		BIT(2)	/* Rx Fabric Module */
+#define FIFO_CFG0_TXS		BIT(3)	/* Tx System Module */
+#define FIFO_CFG0_TXF		BIT(4)	/* Tx Fabric Module */
+#define FIFO_CFG0_ALL	(FIFO_CFG0_WTM | FIFO_CFG0_RXS | FIFO_CFG0_RXF \
+			| FIFO_CFG0_TXS | FIFO_CFG0_TXF)
+
+#define FIFO_CFG0_ENABLE_SHIFT	8
+
+#define FIFO_CFG4_DE		BIT(0)	/* Drop Event */
+#define FIFO_CFG4_DV		BIT(1)	/* RX_DV Event */
+#define FIFO_CFG4_FC		BIT(2)	/* False Carrier */
+#define FIFO_CFG4_CE		BIT(3)	/* Code Error */
+#define FIFO_CFG4_CR		BIT(4)	/* CRC error */
+#define FIFO_CFG4_LM		BIT(5)	/* Length Mismatch */
+#define FIFO_CFG4_LO		BIT(6)	/* Length out of range */
+#define FIFO_CFG4_OK		BIT(7)	/* Packet is OK */
+#define FIFO_CFG4_MC		BIT(8)	/* Multicast Packet */
+#define FIFO_CFG4_BC		BIT(9)	/* Broadcast Packet */
+#define FIFO_CFG4_DR		BIT(10)	/* Dribble */
+#define FIFO_CFG4_LE		BIT(11)	/* Long Event */
+#define FIFO_CFG4_CF		BIT(12)	/* Control Frame */
+#define FIFO_CFG4_PF		BIT(13)	/* Pause Frame */
+#define FIFO_CFG4_UO		BIT(14)	/* Unsupported Opcode */
+#define FIFO_CFG4_VT		BIT(15)	/* VLAN tag detected */
+#define FIFO_CFG4_FT		BIT(16)	/* Frame Truncated */
+#define FIFO_CFG4_UC		BIT(17)	/* Unicast Packet */
+
+#define FIFO_CFG5_DE		BIT(0)	/* Drop Event */
+#define FIFO_CFG5_DV		BIT(1)	/* RX_DV Event */
+#define FIFO_CFG5_FC		BIT(2)	/* False Carrier */
+#define FIFO_CFG5_CE		BIT(3)	/* Code Error */
+#define FIFO_CFG5_LM		BIT(4)	/* Length Mismatch */
+#define FIFO_CFG5_LO		BIT(5)	/* Length Out of Range */
+#define FIFO_CFG5_OK		BIT(6)	/* Packet is OK */
+#define FIFO_CFG5_MC		BIT(7)	/* Multicast Packet */
+#define FIFO_CFG5_BC		BIT(8)	/* Broadcast Packet */
+#define FIFO_CFG5_DR		BIT(9)	/* Dribble */
+#define FIFO_CFG5_CF		BIT(10)	/* Control Frame */
+#define FIFO_CFG5_PF		BIT(11)	/* Pause Frame */
+#define FIFO_CFG5_UO		BIT(12)	/* Unsupported Opcode */
+#define FIFO_CFG5_VT		BIT(13)	/* VLAN tag detected */
+#define FIFO_CFG5_LE		BIT(14)	/* Long Event */
+#define FIFO_CFG5_FT		BIT(15)	/* Frame Truncated */
+#define FIFO_CFG5_16		BIT(16)	/* unknown */
+#define FIFO_CFG5_17		BIT(17)	/* unknown */
+#define FIFO_CFG5_SF		BIT(18)	/* Short Frame */
+#define FIFO_CFG5_BM		BIT(19)	/* Byte Mode */
+
+#define AG71XX_INT_TX_PS	BIT(0)
+#define AG71XX_INT_TX_UR	BIT(1)
+#define AG71XX_INT_TX_BE	BIT(3)
+#define AG71XX_INT_RX_PR	BIT(4)
+#define AG71XX_INT_RX_OF	BIT(6)
+#define AG71XX_INT_RX_BE	BIT(7)
+
+#define MAC_IFCTL_SPEED		BIT(16)
+
+#define MII_CFG_CLK_DIV_4	0
+#define MII_CFG_CLK_DIV_6	2
+#define MII_CFG_CLK_DIV_8	3
+#define MII_CFG_CLK_DIV_10	4
+#define MII_CFG_CLK_DIV_14	5
+#define MII_CFG_CLK_DIV_20	6
+#define MII_CFG_CLK_DIV_28	7
+#define MII_CFG_CLK_DIV_34	8
+#define MII_CFG_CLK_DIV_42	9
+#define MII_CFG_CLK_DIV_50	10
+#define MII_CFG_CLK_DIV_58	11
+#define MII_CFG_CLK_DIV_66	12
+#define MII_CFG_CLK_DIV_74	13
+#define MII_CFG_CLK_DIV_82	14
+#define MII_CFG_CLK_DIV_98	15
+#define MII_CFG_RESET		BIT(31)
+
+#define MII_CMD_WRITE		0x0
+#define MII_CMD_READ		0x1
+#define MII_ADDR_SHIFT		8
+#define MII_IND_BUSY		BIT(0)
+#define MII_IND_INVALID		BIT(2)
+
+#define TX_CTRL_TXE		BIT(0)	/* Tx Enable */
+
+#define TX_STATUS_PS		BIT(0)	/* Packet Sent */
+#define TX_STATUS_UR		BIT(1)	/* Tx Underrun */
+#define TX_STATUS_BE		BIT(3)	/* Bus Error */
+
+#define RX_CTRL_RXE		BIT(0)	/* Rx Enable */
+
+#define RX_STATUS_PR		BIT(0)	/* Packet Received */
+#define RX_STATUS_OF		BIT(2)	/* Rx Overflow */
+#define RX_STATUS_BE		BIT(3)	/* Bus Error */
+
+/*
+ * GMAC register macros
+ */
+#define AG71XX_ETH_CFG_RGMII_GE0        (1<<0)
+#define AG71XX_ETH_CFG_MII_GE0_SLAVE    (1<<4)
+
+/*
+ * h/w descriptor
+ */
+typedef struct {
+	uint32_t    pkt_start_addr;
+
+	uint32_t    is_empty       :  1;
+	uint32_t    res1           : 10;
+	uint32_t    ftpp_override  :  5;
+	uint32_t    res2           :  4;
+	uint32_t    pkt_size       : 12;
+
+	uint32_t    next_desc      ;
+} ag7240_desc_t;
+
+#define NO_OF_TX_FIFOS  8
+#define NO_OF_RX_FIFOS  8
+#define TX_RING_SZ (NO_OF_TX_FIFOS * sizeof(ag7240_desc_t))
+#define MAX_RBUFF_SZ	0x600		/* 1518 rounded up */
+
+#define MAX_WAIT        1000
+
+struct ag71xx {
+	struct device_d *dev;
+	struct eth_device netdev;
+	void __iomem *regs;
+	void __iomem *regs_gmac;
+	struct mii_bus miibus;
+
+	void *rx_buffer;
+
+	unsigned char *rx_pkt[NO_OF_RX_FIFOS];
+	ag7240_desc_t *fifo_tx;
+	ag7240_desc_t *fifo_rx;
+
+	int next_tx;
+	int next_rx;
+};
+
+static inline void ag71xx_check_reg_offset(struct ag71xx *priv, int reg)
+{
+	switch (reg) {
+	case AG71XX_REG_MAC_CFG1 ... AG71XX_REG_MAC_MFL:
+	case AG71XX_REG_MAC_IFCTL ... AG71XX_REG_TX_SM:
+	case AG71XX_REG_MII_CFG:
+		break;
+
+	default:
+		BUG();
+	}
+}
+
+static inline u32 ag71xx_gmac_rr(struct ag71xx *dev, int reg)
+{
+	return __raw_readl(dev->regs_gmac + reg);
+}
+
+static inline void ag71xx_gmac_wr(struct ag71xx *dev, int reg, u32 val)
+{
+	__raw_writel(val, dev->regs_gmac + reg);
+}
+
+static inline u32 ag71xx_rr(struct ag71xx *priv, int reg)
+{
+	ag71xx_check_reg_offset(priv, reg);
+
+	return __raw_readl(priv->regs + reg);
+}
+
+static inline void ag71xx_wr(struct ag71xx *priv, int reg, u32 val)
+{
+	ag71xx_check_reg_offset(priv, reg);
+
+	__raw_writel(val, priv->regs + reg);
+	/* flush write */
+	(void)__raw_readl(priv->regs + reg);
+}
+
+static int ag71xx_ether_mii_read(struct mii_bus *miidev, int addr, int reg)
+{
+	return 0xffff;
+}
+
+static int ag71xx_ether_mii_write(struct mii_bus *miidev, int addr, int reg, u16 val)
+{
+	return 0;
+}
+
+static int ag71xx_ether_set_ethaddr(struct eth_device *edev, const unsigned char *adr)
+{
+	return 0;
+}
+
+static int ag71xx_ether_get_ethaddr(struct eth_device *edev, unsigned char *adr)
+{
+	/* We have no eeprom */
+	return -1;
+}
+
+static void ag71xx_ether_halt(struct eth_device *edev)
+{
+	struct ag71xx *priv = edev->priv;
+
+	ag71xx_wr(priv, AG71XX_REG_RX_CTRL, 0);
+	while (ag71xx_rr(priv, AG71XX_REG_RX_CTRL))
+		;
+}
+
+static int ag71xx_ether_rx(struct eth_device *edev)
+{
+	struct ag71xx *priv = edev->priv;
+	ag7240_desc_t *f;
+	unsigned int work_done;
+
+	for (work_done = 0; work_done < NO_OF_RX_FIFOS; work_done++) {
+		unsigned int pktlen;
+		unsigned char *rx_pkt;
+
+		f = &priv->fifo_rx[priv->next_rx];
+
+		if (f->is_empty)
+			break;
+
+		pktlen = f->pkt_size;
+		rx_pkt = priv->rx_pkt[priv->next_rx];
+
+		/* invalidate */
+		dma_sync_single_for_cpu((unsigned long)rx_pkt, pktlen,
+						DMA_FROM_DEVICE);
+
+		net_receive(edev, rx_pkt, pktlen - 4);
+
+		f->is_empty = 1;
+
+		priv->next_rx = (priv->next_rx + 1) % NO_OF_RX_FIFOS;
+	}
+
+	if (!(ag71xx_rr(priv, AG71XX_REG_RX_CTRL) & RX_CTRL_RXE)) {
+		f = &priv->fifo_rx[priv->next_rx];
+		ag71xx_wr(priv, AG71XX_REG_RX_DESC, virt_to_phys(f));
+		ag71xx_wr(priv, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
+	}
+
+	return work_done;
+}
+
+static int ag71xx_ether_send(struct eth_device *edev, void *packet, int length)
+{
+	struct ag71xx *priv = edev->priv;
+	struct device_d *dev = priv->dev;
+	ag7240_desc_t *f = &priv->fifo_tx[priv->next_tx];
+	int i;
+
+	/* flush */
+	dma_sync_single_for_device((unsigned long)packet, length, DMA_TO_DEVICE);
+
+	f->pkt_start_addr = virt_to_phys(packet);
+	f->res1 = 0;
+	f->pkt_size = length;
+	f->is_empty = 0;
+	ag71xx_wr(priv, AG71XX_REG_TX_DESC, virt_to_phys(f));
+	ag71xx_wr(priv, AG71XX_REG_TX_CTRL, TX_CTRL_TXE);
+
+	/* flush again?! */
+	dma_sync_single_for_cpu((unsigned long)packet, length, DMA_TO_DEVICE);
+
+	for (i = 0; i < MAX_WAIT; i++) {
+		udelay(100);
+		if (f->is_empty) {
+			break;
+		}
+	}
+
+	if (i == MAX_WAIT) {
+		dev_err(dev, "Tx Timed out\n");
+	}
+
+	f->pkt_start_addr = 0;
+	f->pkt_size = 0;
+
+	priv->next_tx = (priv->next_tx + 1) % NO_OF_TX_FIFOS;
+
+	return 0;
+}
+
+static int ag71xx_ether_open(struct eth_device *edev)
+{
+	return 0;
+}
+
+static int ag71xx_ether_init(struct eth_device *edev)
+{
+	struct ag71xx *priv = edev->priv;
+	int i;
+	void *rxbuf = priv->rx_buffer;
+
+	priv->next_rx = 0;
+
+	for (i = 0; i < NO_OF_RX_FIFOS; i++) {
+		ag7240_desc_t *fr = &priv->fifo_rx[i];
+
+		priv->rx_pkt[i] = rxbuf;
+		fr->pkt_start_addr = virt_to_phys(rxbuf);
+		fr->pkt_size = MAX_RBUFF_SZ;
+		fr->is_empty = 1;
+		fr->next_desc = virt_to_phys(&priv->fifo_rx[(i + 1) % NO_OF_RX_FIFOS]);
+
+		/* invalidate */
+		dma_sync_single_for_device((unsigned long)rxbuf, MAX_RBUFF_SZ,
+					DMA_FROM_DEVICE);
+
+		rxbuf += MAX_RBUFF_SZ;
+	}
+
+	/* Clean Tx BD's */
+	memset(priv->fifo_tx, 0, TX_RING_SZ);
+
+	ag71xx_wr(priv, AG71XX_REG_RX_DESC, virt_to_phys(priv->fifo_rx));
+	ag71xx_wr(priv, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
+
+	return 1;
+}
+
+static int ag71xx_mii_setup(struct ag71xx *priv)
+{
+	u32 rd;
+
+	rd = ag71xx_gmac_rr(priv, 0);
+	rd |= AG71XX_ETH_CFG_MII_GE0_SLAVE;
+	ag71xx_gmac_wr(priv, 0, rd);
+
+	return 0;
+}
+
+static int ag71xx_probe(struct device_d *dev)
+{
+	void __iomem *regs, *regs_gmac;
+	struct mii_bus *miibus;
+	struct eth_device *edev;
+	struct ag71xx *priv;
+	u32 mac_h, mac_l;
+	u32 rd;
+
+	regs_gmac = dev_request_mem_region_by_name(dev, "gmac");
+	if (IS_ERR(regs_gmac))
+		return PTR_ERR(regs_gmac);
+
+	regs = dev_request_mem_region_by_name(dev, "ge0");
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+
+	priv = xzalloc(sizeof(struct ag71xx));
+	edev = &priv->netdev;
+	miibus = &priv->miibus;
+	edev->priv = priv;
+
+	edev->init = ag71xx_ether_init;
+	edev->open = ag71xx_ether_open;
+	edev->send = ag71xx_ether_send;
+	edev->recv = ag71xx_ether_rx;
+	edev->halt = ag71xx_ether_halt;
+	edev->get_ethaddr = ag71xx_ether_get_ethaddr;
+	edev->set_ethaddr = ag71xx_ether_set_ethaddr;
+
+	priv->dev = dev;
+	priv->regs = regs;
+	priv->regs_gmac = regs_gmac;
+
+	miibus->read = ag71xx_ether_mii_read;
+	miibus->write = ag71xx_ether_mii_write;
+	miibus->priv = priv;
+
+	/* enable switch core */
+	rd = __raw_readl((char *)KSEG1ADDR(AR71XX_PLL_BASE + AR933X_ETHSW_CLOCK_CONTROL_REG)) & ~(0x1f);
+	rd |= 0x10;
+	__raw_writel(rd, (char *)KSEG1ADDR(AR71XX_PLL_BASE + AR933X_ETHSW_CLOCK_CONTROL_REG));
+
+	if (ath79_reset_rr(AR933X_RESET_REG_RESET_MODULE) != 0)
+		ath79_reset_wr(AR933X_RESET_REG_RESET_MODULE, 0);
+
+	/* reset GE0 MAC and MDIO */
+	rd = ath79_reset_rr(AR933X_RESET_REG_RESET_MODULE);
+	rd |= AR933X_RESET_GE0_MAC | AR933X_RESET_GE0_MDIO | AR933X_RESET_SWITCH;
+	ath79_reset_wr(AR933X_RESET_REG_RESET_MODULE, rd);
+	mdelay(100);
+
+	rd = ath79_reset_rr(AR933X_RESET_REG_RESET_MODULE);
+	rd &= ~(AR933X_RESET_GE0_MAC | AR933X_RESET_GE0_MDIO | AR933X_RESET_SWITCH);
+	ath79_reset_wr(AR933X_RESET_REG_RESET_MODULE, rd);
+	mdelay(100);
+
+	ag71xx_wr(priv, AG71XX_REG_MAC_CFG1, (MAC_CFG1_SR | MAC_CFG1_TX_RST | MAC_CFG1_RX_RST));
+	ag71xx_wr(priv, AG71XX_REG_MAC_CFG1, (MAC_CFG1_RXE | MAC_CFG1_TXE));
+
+	rd = ag71xx_rr(priv, AG71XX_REG_MAC_CFG2);
+	rd |= (MAC_CFG2_PAD_CRC_EN | MAC_CFG2_LEN_CHECK | MAC_CFG2_IF_10_100);
+	ag71xx_wr(priv, AG71XX_REG_MAC_CFG2, rd);
+
+	/* config FIFOs */
+	ag71xx_wr(priv, AG71XX_REG_FIFO_CFG0, 0x1f00);
+
+	ag71xx_mii_setup(priv);
+
+	ag71xx_wr(priv, AG71XX_REG_FIFO_CFG1, 0x10ffff);
+	ag71xx_wr(priv, AG71XX_REG_FIFO_CFG2, 0xAAA0555);
+
+	ag71xx_wr(priv, AG71XX_REG_FIFO_CFG4, 0x3ffff);
+	ag71xx_wr(priv, AG71XX_REG_FIFO_CFG5, 0x66b82);
+	ag71xx_wr(priv, AG71XX_REG_FIFO_CFG3, 0x1f00140);
+
+	priv->rx_buffer = xmemalign(PAGE_SIZE, NO_OF_RX_FIFOS * MAX_RBUFF_SZ);
+	priv->fifo_tx = dma_alloc_coherent(NO_OF_TX_FIFOS * sizeof(ag7240_desc_t), DMA_ADDRESS_BROKEN);
+	priv->fifo_rx = dma_alloc_coherent(NO_OF_RX_FIFOS * sizeof(ag7240_desc_t), DMA_ADDRESS_BROKEN);
+	priv->next_tx = 0;
+
+	mac_l = 0x3344;
+	mac_h = 0x0004d980;
+
+	ag71xx_wr(priv, AG71XX_REG_MAC_ADDR1, mac_l);
+	ag71xx_wr(priv, AG71XX_REG_MAC_ADDR2, mac_h);
+
+	mdiobus_register(miibus);
+	eth_register(edev);
+
+	dev_info(dev, "network device registered\n");
+
+	return 0;
+}
+
+static __maybe_unused struct of_device_id ag71xx_dt_ids[] = {
+	{
+		.compatible = "qca,ar7100-gmac",
+	}, {
+		/* sentinel */
+	}
+};
+
+static struct driver_d ag71xx_driver = {
+	.name	= "ag71xx-gmac",
+	.probe		= ag71xx_probe,
+	.of_compatible = DRV_OF_COMPAT(ag71xx_dt_ids),
+};
+device_platform_driver(ag71xx_driver);
-- 
2.11.0


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