Date:   Fri, 5 Oct 2018 10:24:55 +0000
From:   Igor Russkikh <Igor.Russkikh@...antia.com>
To:     "David S . Miller" <davem@...emloft.net>
CC:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Igor Russkikh <Igor.Russkikh@...antia.com>,
        Dmitry Bezrukov <Dmitry.Bezrukov@...antia.com>
Subject: [PATCH net-next 06/19] net: usb: aqc111: Introduce link management

From: Dmitry Bezrukov <dmitry.bezrukov@...antia.com>

Add full hardware initialization sequence and link configuration logic

Signed-off-by: Dmitry Bezrukov <dmitry.bezrukov@...antia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@...antia.com>
---
 drivers/net/usb/aqc111.c | 330 +++++++++++++++++++++++++++++++++++++++++++++++
 drivers/net/usb/aqc111.h |  51 ++++++++
 2 files changed, 381 insertions(+)

diff --git a/drivers/net/usb/aqc111.c b/drivers/net/usb/aqc111.c
index 30219bb6ddfd..1d366f4a1c51 100644
--- a/drivers/net/usb/aqc111.c
+++ b/drivers/net/usb/aqc111.c
@@ -150,6 +150,122 @@ static int aq_mdio_write_cmd(struct usbnet *dev, u16 value, u16 index,
 	return aqc111_write_cmd(dev, AQ_PHY_CMD, value, index, size, data);
 }
 
+static void aqc111_set_phy_speed_fw_iface(struct usbnet *dev,
+					  struct aqc111_data *aqc111_data)
+{
+	aqc111_write_cmd(dev, AQ_PHY_OPS, 0, 0, 4, &aqc111_data->phy_ops);
+}
+
+static void aqc111_set_phy_speed_direct(struct usbnet *dev,
+					struct aqc111_data *aqc111_data)
+{
+	u16 reg16_1 = 0;
+	u16 reg16_2 = 0;
+	u16 reg16_3 = 0;
+
+	/* Disable auto-negotiation */
+	reg16_1 = AQ_ANEG_EX_PAGE_CTRL;
+	aq_mdio_write_cmd(dev, AQ_AUTONEG_STD_CTRL_REG, AQ_PHY_AUTONEG_ADDR,
+			  2, &reg16_1);
+
+	reg16_1 = AQ_ANEG_EX_PHY_ID | AQ_ANEG_ADV_AQRATE;
+	if (aqc111_data->phy_ops.downshift) {
+		reg16_1 |= AQ_ANEG_EN_DSH;
+		reg16_1 |= aqc111_data->phy_ops.dsh_ret_cnt & 0x0F;
+	}
+
+	reg16_2 = AQ_ANEG_ADV_LT;
+	if (aqc111_data->phy_ops.pause)
+		reg16_3 |= AQ_ANEG_PAUSE;
+
+	if (aqc111_data->phy_ops.asym_pause)
+		reg16_3 |= AQ_ANEG_ASYM_PAUSE;
+
+	if (aqc111_data->phy_ops.adv_5G) {
+		reg16_1 |= AQ_ANEG_ADV_5G_N;
+		reg16_2 |= AQ_ANEG_ADV_5G_T;
+	}
+	if (aqc111_data->phy_ops.adv_2G5) {
+		reg16_1 |= AQ_ANEG_ADV_2G5_N;
+		reg16_2 |= AQ_ANEG_ADV_2G5_T;
+	}
+	if (aqc111_data->phy_ops.adv_1G)
+		reg16_1 |= AQ_ANEG_ADV_1G;
+
+	if (aqc111_data->phy_ops.adv_5G)
+		reg16_3 |= AQ_ANEG_100M;
+
+	aq_mdio_write_cmd(dev, AQ_AUTONEG_VEN_PROV1_REG,
+			  AQ_PHY_AUTONEG_ADDR, 2, &reg16_1);
+	aq_mdio_write_cmd(dev, AQ_AUTONEG_10GT_CTRL_REG,
+			  AQ_PHY_AUTONEG_ADDR, 2, &reg16_2);
+
+	aq_mdio_read_cmd(dev, AQ_AUTONEG_ADV_REG, AQ_PHY_AUTONEG_ADDR,
+			 2, &reg16_1);
+	reg16_1 &= ~AQ_ANEG_ABILITY_MASK;
+	reg16_1 |= reg16_3;
+	aq_mdio_write_cmd(dev, AQ_AUTONEG_ADV_REG, AQ_PHY_AUTONEG_ADDR,
+			  2, &reg16_1);
+
+	/* Restart auto-negotiation */
+	reg16_1 = AQ_ANEG_EX_PAGE_CTRL | AQ_ANEG_EN_ANEG |
+		  AQ_ANEG_RESTART_ANEG;
+
+	aq_mdio_write_cmd(dev, AQ_AUTONEG_STD_CTRL_REG,
+			  AQ_PHY_AUTONEG_ADDR, 2, &reg16_1);
+}
+
+static void aqc111_set_phy_speed(struct usbnet *dev, u8 autoneg, u16 speed)
+{
+	struct aqc111_data *aqc111_data = (struct aqc111_data *)dev->data[0];
+
+	aqc111_data->phy_ops.advertising = 0;
+	aqc111_data->phy_ops.pause = 1;
+	aqc111_data->phy_ops.asym_pause = 1;
+	aqc111_data->phy_ops.downshift = 1;
+	aqc111_data->phy_ops.dsh_ret_cnt = 3;
+	if (autoneg == AUTONEG_ENABLE) {
+		switch (speed) {
+		case SPEED_5000:
+			aqc111_data->phy_ops.adv_5G = 1;
+		case SPEED_2500:
+			aqc111_data->phy_ops.adv_2G5 = 1;
+		case SPEED_1000:
+			aqc111_data->phy_ops.adv_1G = 1;
+		case SPEED_100:
+			aqc111_data->phy_ops.adv_100M = 1;
+		}
+	} else {
+		switch (speed) {
+		case SPEED_5000:
+		{
+			aqc111_data->phy_ops.adv_5G = 1;
+			break;
+		}
+		case SPEED_2500:
+		{
+			aqc111_data->phy_ops.adv_2G5 = 1;
+			break;
+		}
+		case SPEED_1000:
+		{
+			aqc111_data->phy_ops.adv_1G = 1;
+			break;
+		}
+		case SPEED_100:
+		{
+			aqc111_data->phy_ops.adv_100M = 1;
+			break;
+		}
+		}
+	}
+
+	if (aqc111_data->dpa)
+		aqc111_set_phy_speed_direct(dev, aqc111_data);
+	else
+		aqc111_set_phy_speed_fw_iface(dev, aqc111_data);
+}
+
 static const struct net_device_ops aqc111_netdev_ops = {
 	.ndo_open		= usbnet_open,
 	.ndo_stop		= usbnet_stop,
@@ -176,6 +292,7 @@ static int aqc111_bind(struct usbnet *dev, struct usb_interface *intf)
 	int ret;
 	struct usb_device *udev = interface_to_usbdev(intf);
 	struct aqc111_data *aqc111_data;
+	enum usb_device_speed usb_speed = dev->udev->speed;
 
 	/* Check if vendor configuration */
 	if (udev->actconfig->desc.bConfigurationValue != 1) {
@@ -202,6 +319,9 @@ static int aqc111_bind(struct usbnet *dev, struct usb_interface *intf)
 	dev->net->netdev_ops = &aqc111_netdev_ops;
 
 	aqc111_read_fw_version(dev, aqc111_data);
+	aqc111_data->autoneg = AUTONEG_ENABLE;
+	aqc111_data->advertised_speed = (usb_speed == USB_SPEED_SUPER) ?
+					 SPEED_5000 : SPEED_1000;
 
 	return 0;
 }
@@ -227,6 +347,7 @@ static void aqc111_unbind(struct usbnet *dev, struct usb_interface *intf)
 		aqc111_write_cmd_nopm(dev, AQ_PHY_POWER, 0,
 				      0, 1, &reg8);
 	} else {
+		aqc111_data->phy_ops.advertising = 0;
 		aqc111_data->phy_ops.low_power = 1;
 		aqc111_data->phy_ops.phy_power = 0;
 		aqc111_write_cmd_nopm(dev, AQ_PHY_OPS, 0, 0,
@@ -236,13 +357,212 @@ static void aqc111_unbind(struct usbnet *dev, struct usb_interface *intf)
 	kfree(aqc111_data);
 }
 
+static void aqc111_status(struct usbnet *dev, struct urb *urb)
+{
+	struct aqc111_int_data *event = NULL;
+	struct aqc111_data *aqc111_data = (struct aqc111_data *)dev->data[0];
+	int link = 0;
+
+	if (urb->actual_length < 8)
+		return;
+
+	event = urb->transfer_buffer;
+
+	if (event->link_status)
+		link = 1;
+	else
+		link = 0;
+
+	aqc111_data->link_speed = event->link_speed;
+	aqc111_data->link = link;
+
+	if (netif_carrier_ok(dev->net) != link)
+		usbnet_defer_kevent(dev, EVENT_LINK_RESET);
+}
+
+static void aqc111_configure_rx(struct usbnet *dev,
+				struct aqc111_data *aqc111_data)
+{
+	u8 reg8 = 0;
+	u8 queue_num = 0;
+	u16 reg16 = 0;
+	u16 link_speed = 0, usb_host = 0;
+	u8 buf[5] = { 0 };
+	enum usb_device_speed usb_speed = dev->udev->speed;
+
+	buf[0] = 0x00;
+	buf[1] = 0xF8;
+	buf[2] = 0x07;
+	switch (aqc111_data->link_speed) {
+	case AQ_INT_SPEED_5G:
+	{
+		link_speed = 5000;
+		reg8 = 0x05;
+		reg16 = 0x001F;
+		break;
+	}
+	case AQ_INT_SPEED_2_5G:
+	{
+		link_speed = 2500;
+		reg16 = 0x003F;
+		break;
+	}
+	case AQ_INT_SPEED_1G:
+	{
+		link_speed = 1000;
+		reg16 = 0x009F;
+		break;
+	}
+	case AQ_INT_SPEED_100M:
+	{
+		link_speed = 100;
+		queue_num = 1;
+		reg16 = 0x063F;
+		buf[1] = 0xFB;
+		buf[2] = 0x4;
+		break;
+	}
+	}
+
+	if (aqc111_data->dpa) {
+		/* Set Phy Flow control */
+		aq_mdio_write_cmd(dev, AQ_GLB_ING_PAUSE_CTRL_REG,
+				  AQ_PHY_AUTONEG_ADDR, 2, &reg16);
+		aq_mdio_write_cmd(dev, AQ_GLB_EGR_PAUSE_CTRL_REG,
+				  AQ_PHY_AUTONEG_ADDR, 2, &reg16);
+	}
+
+	aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_INTER_PACKET_GAP_0,
+			 1, 1, &reg8);
+
+	aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_TX_PAUSE_RESEND_T, 3, 3, buf);
+
+	switch (usb_speed) {
+	case USB_SPEED_SUPER:
+	{
+		usb_host = 3;
+		break;
+	}
+	case USB_SPEED_HIGH:
+	{
+		usb_host = 2;
+		break;
+	}
+	case USB_SPEED_FULL:
+	case USB_SPEED_LOW:
+	{
+		usb_host = 1;
+		queue_num = 0;
+		break;
+	}
+	default:
+	{
+		usb_host = 0;
+		break;
+	}
+	}
+
+	memcpy(buf, &AQC111_BULKIN_SIZE[queue_num], 5);
+	/* RX bulk configuration */
+	aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_RX_BULKIN_QCTRL, 5, 5, buf);
+
+	/* Set high low water level */
+	reg16 = 0x0810;
+
+	aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_PAUSE_WATERLVL_LOW,
+			 2, 2, &reg16);
+	netdev_info(dev->net, "Link Speed %d, USB %d", link_speed, usb_host);
+}
+
+static int aqc111_link_reset(struct usbnet *dev)
+{
+	u8 reg8 = 0;
+	u16 reg16 = 0;
+	struct aqc111_data *aqc111_data = (struct aqc111_data *)dev->data[0];
+
+	if (aqc111_data->link == 1) { /* Link up */
+		aqc111_configure_rx(dev, aqc111_data);
+
+		/* Vlan Tag Filter */
+		reg8 = SFR_VLAN_CONTROL_VSO;
+
+		aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_VLAN_ID_CONTROL,
+				 1, 1, &reg8);
+
+		reg8 = 0x0;
+		aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_BMRX_DMA_CONTROL,
+				 1, 1, &reg8);
+
+		aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_BMTX_DMA_CONTROL,
+				 1, 1, &reg8);
+
+		aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_ARC_CTRL, 1, 1, &reg8);
+
+		reg16 = SFR_RX_CTL_IPE | SFR_RX_CTL_AB;
+		aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_RX_CTL, 2, 2, &reg16);
+
+		reg8 = SFR_RX_PATH_READY;
+		aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_ETH_MAC_PATH,
+				 1, 1, &reg8);
+
+		reg8 = SFR_BULK_OUT_EFF_EN;
+		aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_BULK_OUT_CTRL,
+				 1, 1, &reg8);
+
+		reg16 = 0;
+		aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_MEDIUM_STATUS_MODE,
+				 2, 2, &reg16);
+
+		reg16 = SFR_MEDIUM_XGMIIMODE | SFR_MEDIUM_FULL_DUPLEX;
+		aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_MEDIUM_STATUS_MODE,
+				 2, 2, &reg16);
+
+		aqc111_read_cmd(dev, AQ_ACCESS_MAC, SFR_MEDIUM_STATUS_MODE,
+				2, 2, &reg16);
+
+		reg16 |= SFR_MEDIUM_RECEIVE_EN | SFR_MEDIUM_RXFLOW_CTRLEN |
+			 SFR_MEDIUM_TXFLOW_CTRLEN;
+		aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_MEDIUM_STATUS_MODE,
+				 2, 2, &reg16);
+
+		reg16 = SFR_RX_CTL_IPE | SFR_RX_CTL_AB | SFR_RX_CTL_START;
+		aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_RX_CTL, 2, 2, &reg16);
+
+		netif_carrier_on(dev->net);
+	} else {
+		aqc111_read_cmd(dev, AQ_ACCESS_MAC, SFR_MEDIUM_STATUS_MODE,
+				2, 2, &reg16);
+		reg16 &= ~SFR_MEDIUM_RECEIVE_EN;
+		aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_MEDIUM_STATUS_MODE,
+				 2, 2, &reg16);
+
+		aqc111_read_cmd(dev, AQ_ACCESS_MAC, SFR_RX_CTL, 2, 2, &reg16);
+		reg16 &= ~SFR_RX_CTL_START;
+		aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_RX_CTL, 2, 2, &reg16);
+
+		reg8 = SFR_BULK_OUT_FLUSH_EN | SFR_BULK_OUT_EFF_EN;
+		aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_BULK_OUT_CTRL,
+				 1, 1, &reg8);
+		reg8 = SFR_BULK_OUT_EFF_EN;
+		aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_BULK_OUT_CTRL,
+				 1, 1, &reg8);
+
+		netif_carrier_off(dev->net);
+	}
+	return 0;
+}
+
 static int aqc111_reset(struct usbnet *dev)
 {
 	u8 reg8 = 0;
 	u16 reg16 = 0;
+	enum usb_device_speed usb_speed;
 	struct aqc111_data *aqc111_data = (struct aqc111_data *)dev->data[0];
 
+	usb_speed = dev->udev->speed;
+
 	/* Power up ethernet PHY */
+	aqc111_data->phy_ops.advertising = 0;
 	aqc111_data->phy_ops.phy_ctrl1 = 0;
 	aqc111_data->phy_ops.phy_ctrl2 = 0;
 
@@ -279,6 +599,12 @@ static int aqc111_reset(struct usbnet *dev)
 		  SFR_MONITOR_MODE_RW_FLAG);
 	aqc111_write_cmd(dev, AQ_ACCESS_MAC, SFR_MONITOR_MODE, 1, 1, &reg8);
 
+	netif_carrier_off(dev->net);
+
+	/* Phy advertise */
+	aqc111_set_phy_speed(dev, aqc111_data->autoneg,
+			     aqc111_data->advertised_speed);
+
 	return 0;
 }
 
@@ -307,6 +633,8 @@ static int aqc111_stop(struct usbnet *dev)
 				 4, &aqc111_data->phy_ops);
 	}
 
+	netif_carrier_off(dev->net);
+
 	return 0;
 }
 
@@ -314,6 +642,8 @@ static const struct driver_info aqc111_info = {
 	.description	= "Aquantia AQtion USB to 5GbE Controller",
 	.bind		= aqc111_bind,
 	.unbind		= aqc111_unbind,
+	.status		= aqc111_status,
+	.link_reset	= aqc111_link_reset,
 	.reset		= aqc111_reset,
 	.stop		= aqc111_stop,
 };
diff --git a/drivers/net/usb/aqc111.h b/drivers/net/usb/aqc111.h
index 8738d2c4ae90..5c5602e6d236 100644
--- a/drivers/net/usb/aqc111.h
+++ b/drivers/net/usb/aqc111.h
@@ -18,12 +18,44 @@
 #define AQC111_PHY_ID			0x00
 #define AQ_PHY_ADDR(mmd)		((AQC111_PHY_ID << 8) | mmd)
 
+#define AQ_PHY_AUTONEG_MMD		0x07
+#define AQ_PHY_AUTONEG_ADDR		AQ_PHY_ADDR(AQ_PHY_AUTONEG_MMD)
+
+#define AQ_AUTONEG_STD_CTRL_REG		0x0000
+	#define AQ_ANEG_EX_PAGE_CTRL		0x2000
+	#define AQ_ANEG_EN_ANEG			0x1000
+	#define AQ_ANEG_RESTART_ANEG		0x0200
+
+#define AQ_AUTONEG_ADV_REG		0x0010
+	#define AQ_ANEG_100M			0x0100
+	#define AQ_ANEG_PAUSE			0x0400
+	#define AQ_ANEG_ASYM_PAUSE		0x0800
+	#define AQ_ANEG_ABILITY_MASK		0x0FE0
+
+#define AQ_AUTONEG_10GT_CTRL_REG	0x0020
+	#define AQ_ANEG_ADV_10G_T		0x1000
+	#define AQ_ANEG_ADV_5G_T		0x0100
+	#define AQ_ANEG_ADV_2G5_T		0x0080
+	#define AQ_ANEG_ADV_LT			0x0001
+
+#define AQ_AUTONEG_VEN_PROV1_REG	0xC400
+	#define AQ_ANEG_ADV_1G			0x8000
+	#define AQ_ANEG_ADV_AQRATE		0x1000
+	#define AQ_ANEG_ADV_5G_N		0x0800
+	#define AQ_ANEG_ADV_2G5_N		0x0400
+	#define AQ_ANEG_EX_PHY_ID		0x0040
+	#define AQ_ANEG_EN_DSH			0x0010
+	#define AQ_ANEG_DSH_RETRY		0x0003
+
 #define AQ_PHY_GLOBAL_MMD		0x1E
 #define AQ_PHY_GLOBAL_ADDR		AQ_PHY_ADDR(AQ_PHY_GLOBAL_MMD)
 
 #define AQ_GLB_STD_CTRL_REG		0x0000
 	#define AQ_PHY_LOW_POWER_MODE		0x0800
 
+#define AQ_GLB_ING_PAUSE_CTRL_REG	0x7148
+#define AQ_GLB_EGR_PAUSE_CTRL_REG	0x4148
+
 #define AQ_USB_PHY_SET_TIMEOUT		10000
 #define AQ_USB_SET_TIMEOUT		4000
 
@@ -163,6 +195,10 @@ struct aqc111_phy_options {
 };
 
 struct aqc111_data {
+	u8 link_speed;
+	u8 link;
+	u8 autoneg;
+	u32 advertised_speed;
 	struct {
 		u8 major;
 		u8 minor;
@@ -172,6 +208,21 @@ struct aqc111_data {
 	struct aqc111_phy_options phy_ops;
 } __packed;
 
+struct aqc111_int_data {
+	u8 res1;
+	u8 link_speed: 7;
+	u8 link_status: 1;
+	__le16 res2;
+	__le16 res3;
+	__le16 res4;
+} __packed;
+
+#define AQ_INT_SPEED_10G	0x0E
+#define AQ_INT_SPEED_5G		0x0F
+#define AQ_INT_SPEED_2_5G	0x10
+#define AQ_INT_SPEED_1G		0x11
+#define AQ_INT_SPEED_100M	0x13
+
 static struct {
 	unsigned char ctrl;
 	unsigned char timer_l;
-- 
2.7.4

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