[PATCH 10/21] net: thunderx: Add RGMII interface type support

[sunil.kovvuri@gmail.com]

From: Sunil Goutham <sgoutham@cavium.com>

This patch adds RGX/RGMII interface type support to BGX
driver. This type of interface is supported by 81xx SOC.

CN81XX VNIC has 8 VFs and max possible LMAC interfaces are 9,
hence RGMII interface will not work if all DLMs are in BGX mode
and all 8 LMACs are enabled

Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
---
 drivers/net/ethernet/cavium/Kconfig               |  10 +
 drivers/net/ethernet/cavium/thunder/Makefile      |   1 +
 drivers/net/ethernet/cavium/thunder/nic_main.c    |  14 +-
 drivers/net/ethernet/cavium/thunder/thunder_bgx.c |  97 ++++++---
 drivers/net/ethernet/cavium/thunder/thunder_bgx.h |   6 +-
 drivers/net/ethernet/cavium/thunder/thunder_xcv.c | 237 ++++++++++++++++++++++
 6 files changed, 332 insertions(+), 33 deletions(-)
 create mode 100644 drivers/net/ethernet/cavium/thunder/thunder_xcv.c

diff --git a/drivers/net/ethernet/cavium/Kconfig b/drivers/net/ethernet/cavium/Kconfig
index 0ef232d..e1b78b5 100644
--- a/drivers/net/ethernet/cavium/Kconfig
+++ b/drivers/net/ethernet/cavium/Kconfig
@@ -36,10 +36,20 @@ config	THUNDER_NIC_BGX
 	depends on 64BIT
 	select PHYLIB
 	select MDIO_THUNDER
+	select THUNDER_NIC_RGX
 	---help---
 	  This driver supports programming and controlling of MAC
 	  interface from NIC physical function driver.
 
+config	THUNDER_NIC_RGX
+	tristate "Thunder MAC interface driver (RGX)"
+	depends on 64BIT
+	select PHYLIB
+	select MDIO_THUNDER
+	---help---
+	  This driver supports configuring XCV block of RGX interface
+	  present on CN81XX chip.
+
 config LIQUIDIO
 	tristate "Cavium LiquidIO support"
 	depends on 64BIT
diff --git a/drivers/net/ethernet/cavium/thunder/Makefile b/drivers/net/ethernet/cavium/thunder/Makefile
index 5c4615c..6b4d4ad 100644
--- a/drivers/net/ethernet/cavium/thunder/Makefile
+++ b/drivers/net/ethernet/cavium/thunder/Makefile
@@ -2,6 +2,7 @@
 # Makefile for Cavium's Thunder ethernet device
 #
 
+obj-$(CONFIG_THUNDER_NIC_RGX) += thunder_xcv.o
 obj-$(CONFIG_THUNDER_NIC_BGX) += thunder_bgx.o
 obj-$(CONFIG_THUNDER_NIC_PF) += nicpf.o
 obj-$(CONFIG_THUNDER_NIC_VF) += nicvf.o
diff --git a/drivers/net/ethernet/cavium/thunder/nic_main.c b/drivers/net/ethernet/cavium/thunder/nic_main.c
index 955c522..91c575d 100644
--- a/drivers/net/ethernet/cavium/thunder/nic_main.c
+++ b/drivers/net/ethernet/cavium/thunder/nic_main.c
@@ -325,6 +325,14 @@ static void nic_set_lmac_vf_mapping(struct nicpf *nic)
 			nic_reg_write(nic,
 				      NIC_PF_LMAC_0_7_CREDIT + (lmac * 8),
 				      lmac_credit);
+
+		/* On CN81XX there are only 8 VFs but max possible no of
+		 * interfaces are 9.
+		 */
+		if (nic->num_vf_en >= pci_sriov_get_totalvfs(nic->pdev)) {
+			nic->num_vf_en = pci_sriov_get_totalvfs(nic->pdev);
+			break;
+		}
 	}
 }
 
@@ -450,10 +458,8 @@ static void nic_config_cpi(struct nicpf *nic, struct cpi_cfg_msg *cfg)
 	lmac = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vnic]);
 
 	chan = (lmac * hw->chans_per_lmac) + (bgx * hw->chans_per_bgx);
-	cpi_base = (lmac * NIC_MAX_CPI_PER_LMAC) +
-		   (bgx * (hw->cpi_cnt / hw->bgx_cnt));
-	rssi_base = (lmac * hw->rss_ind_tbl_size) +
-		    (bgx * (hw->rssi_cnt / hw->bgx_cnt));
+	cpi_base = vnic * NIC_MAX_CPI_PER_LMAC;
+	rssi_base = vnic * hw->rss_ind_tbl_size;
 
 	/* Rx channel configuration */
 	nic_reg_write(nic, NIC_PF_CHAN_0_255_RX_BP_CFG | (chan << 3),
diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
index 0bf8d24..4ddc760 100644
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
@@ -48,9 +48,11 @@ struct bgx {
 	u8			bgx_id;
 	struct	lmac		lmac[MAX_LMAC_PER_BGX];
 	int			lmac_count;
+	u8			max_lmac;
 	void __iomem		*reg_base;
 	struct pci_dev		*pdev;
 	bool                    is_81xx;
+	bool                    is_rgx;
 };
 
 static struct bgx *bgx_vnic[MAX_BGX_THUNDER];
@@ -61,6 +63,7 @@ static int bgx_xaui_check_link(struct lmac *lmac);
 /* Supported devices */
 static const struct pci_device_id bgx_id_table[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, PCI_DEVICE_ID_THUNDER_BGX) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, PCI_DEVICE_ID_THUNDER_RGX) },
 	{ 0, }  /* end of table */
 };
 
@@ -124,7 +127,7 @@ unsigned bgx_get_map(int node)
 	int i;
 	unsigned map = 0;
 
-	for (i = 0; i < MAX_BGX_PER_CN88XX; i++) {
+	for (i = 0; i < MAX_BGX_PER_CN81XX; i++) {
 		if (bgx_vnic[(node * MAX_BGX_PER_CN88XX) + i])
 			map |= (1 << i);
 	}
@@ -189,10 +192,12 @@ EXPORT_SYMBOL(bgx_set_lmac_mac);
 void bgx_lmac_rx_tx_enable(int node, int bgx_idx, int lmacid, bool enable)
 {
 	struct bgx *bgx = bgx_vnic[(node * MAX_BGX_PER_CN88XX) + bgx_idx];
+	struct lmac *lmac;
 	u64 cfg;
 
 	if (!bgx)
 		return;
+	lmac = &bgx->lmac[lmacid];
 
 	cfg = bgx_reg_read(bgx, lmacid, BGX_CMRX_CFG);
 	if (enable)
@@ -200,6 +205,9 @@ void bgx_lmac_rx_tx_enable(int node, int bgx_idx, int lmacid, bool enable)
 	else
 		cfg &= ~(CMR_PKT_RX_EN | CMR_PKT_TX_EN);
 	bgx_reg_write(bgx, lmacid, BGX_CMRX_CFG, cfg);
+
+	if (bgx->is_rgx)
+		xcv_setup_link(enable ? lmac->link_up : 0, lmac->last_speed);
 }
 EXPORT_SYMBOL(bgx_lmac_rx_tx_enable);
 
@@ -266,9 +274,12 @@ static void bgx_sgmii_change_link_state(struct lmac *lmac)
 
 	port_cfg = bgx_reg_read(bgx, lmac->lmacid, BGX_GMP_GMI_PRTX_CFG);
 
-	/* renable lmac */
+	/* Re-enable lmac */
 	cmr_cfg |= CMR_EN;
 	bgx_reg_write(bgx, lmac->lmacid, BGX_CMRX_CFG, cmr_cfg);
+
+	if (bgx->is_rgx && (cmr_cfg & (CMR_PKT_RX_EN | CMR_PKT_TX_EN)))
+		xcv_setup_link(lmac->link_up, lmac->last_speed);
 }
 
 static void bgx_lmac_handler(struct net_device *netdev)
@@ -418,10 +429,12 @@ static int bgx_lmac_sgmii_init(struct bgx *bgx, struct lmac *lmac)
 		return 0;
 	}
 
-	if (bgx_poll_reg(bgx, lmacid, BGX_GMP_PCS_MRX_STATUS,
-			 PCS_MRX_STATUS_AN_CPT, false)) {
-		dev_err(&bgx->pdev->dev, "BGX AN_CPT not completed\n");
-		return -1;
+	if (lmac->lmac_type == BGX_MODE_SGMII) {
+		if (bgx_poll_reg(bgx, lmacid, BGX_GMP_PCS_MRX_STATUS,
+				 PCS_MRX_STATUS_AN_CPT, false)) {
+			dev_err(&bgx->pdev->dev, "BGX AN_CPT not completed\n");
+			return -1;
+		}
 	}
 
 	return 0;
@@ -663,6 +676,8 @@ static int phy_interface_mode(u8 lmac_type)
 {
 	if (lmac_type == BGX_MODE_QSGMII)
 		return PHY_INTERFACE_MODE_QSGMII;
+	if (lmac_type == BGX_MODE_RGMII)
+		return PHY_INTERFACE_MODE_RGMII;
 
 	return PHY_INTERFACE_MODE_SGMII;
 }
@@ -676,7 +691,8 @@ static int bgx_lmac_enable(struct bgx *bgx, u8 lmacid)
 	lmac->bgx = bgx;
 
 	if ((lmac->lmac_type == BGX_MODE_SGMII) ||
-	    (lmac->lmac_type == BGX_MODE_QSGMII)) {
+	    (lmac->lmac_type == BGX_MODE_QSGMII) ||
+	    (lmac->lmac_type == BGX_MODE_RGMII)) {
 		lmac->is_sgmii = 1;
 		if (bgx_lmac_sgmii_init(bgx, lmac))
 			return -1;
@@ -829,7 +845,7 @@ static void bgx_print_qlm_mode(struct bgx *bgx, u8 lmacid)
 	char str[20];
 	u8 dlm;
 
-	if (lmacid > MAX_LMAC_PER_BGX)
+	if (lmacid > bgx->max_lmac)
 		return;
 
 	lmac = &bgx->lmac[lmacid];
@@ -870,6 +886,9 @@ static void bgx_print_qlm_mode(struct bgx *bgx, u8 lmacid)
 			return;
 		dev_info(dev, "%s: QSGMII\n", (char *)str);
 		break;
+	case BGX_MODE_RGMII:
+		dev_info(dev, "%s: RGMII\n", (char *)str);
+		break;
 	case BGX_MODE_INVALID:
 		/* Nothing to do */
 		break;
@@ -885,6 +904,7 @@ static void lmac_set_lane2sds(struct bgx *bgx, struct lmac *lmac)
 		break;
 	case BGX_MODE_XAUI:
 	case BGX_MODE_XLAUI:
+	case BGX_MODE_RGMII:
 		lmac->lane_to_sds = 0xE4;
 		break;
 	case BGX_MODE_RXAUI:
@@ -904,6 +924,18 @@ static void lmac_set_lane2sds(struct bgx *bgx, struct lmac *lmac)
 	}
 }
 
+static void lmac_set_training(struct bgx *bgx, struct lmac *lmac, int lmacid)
+{
+	if ((lmac->lmac_type != BGX_MODE_10G_KR) &&
+	    (lmac->lmac_type != BGX_MODE_40G_KR)) {
+		lmac->use_training = 0;
+		return;
+	}
+
+	lmac->use_training = bgx_reg_read(bgx, lmacid, BGX_SPUX_BR_PMD_CRTL) &
+							SPU_PMD_CRTL_TRAIN_EN;
+}
+
 static void bgx_set_lmac_config(struct bgx *bgx, u8 idx)
 {
 	struct lmac *lmac;
@@ -914,15 +946,15 @@ static void bgx_set_lmac_config(struct bgx *bgx, u8 idx)
 
 	lmac = &bgx->lmac[idx];
 
-	if (!bgx->is_81xx) {
+	if (!bgx->is_81xx || bgx->is_rgx) {
 		/* Read LMAC0 type to figure out QLM mode
 		 * This is configured by low level firmware
 		 */
 		cmr_cfg = bgx_reg_read(bgx, 0, BGX_CMRX_CFG);
 		lmac->lmac_type = (cmr_cfg >> 8) & 0x07;
-		lmac->use_training =
-			bgx_reg_read(bgx, 0, BGX_SPUX_BR_PMD_CRTL) &
-				SPU_PMD_CRTL_TRAIN_EN;
+		if (bgx->is_rgx)
+			lmac->lmac_type = BGX_MODE_RGMII;
+		lmac_set_training(bgx, lmac, 0);
 		lmac_set_lane2sds(bgx, lmac);
 		return;
 	}
@@ -939,17 +971,13 @@ static void bgx_set_lmac_config(struct bgx *bgx, u8 idx)
 			lmac->lmac_type = BGX_MODE_INVALID;
 		else
 			lmac->lmac_type = lmac_type;
-		lmac->use_training =
-			bgx_reg_read(bgx, idx, BGX_SPUX_BR_PMD_CRTL) &
-				SPU_PMD_CRTL_TRAIN_EN;
+		lmac_set_training(bgx, lmac, lmac->lmacid);
 		lmac_set_lane2sds(bgx, lmac);
 
 		/* Set LMAC type of other lmac on same DLM i.e LMAC 1/3 */
 		olmac = &bgx->lmac[idx + 1];
 		olmac->lmac_type = lmac->lmac_type;
-		olmac->use_training =
-		bgx_reg_read(bgx, idx + 1, BGX_SPUX_BR_PMD_CRTL) &
-			SPU_PMD_CRTL_TRAIN_EN;
+		lmac_set_training(bgx, olmac, olmac->lmacid);
 		lmac_set_lane2sds(bgx, olmac);
 	}
 }
@@ -976,21 +1004,22 @@ static void bgx_get_qlm_mode(struct bgx *bgx)
 	u8  idx;
 
 	/* Init all LMAC's type to invalid */
-	for (idx = 0; idx < MAX_LMAC_PER_BGX; idx++) {
+	for (idx = 0; idx < bgx->max_lmac; idx++) {
 		lmac = &bgx->lmac[idx];
-		lmac->lmac_type = BGX_MODE_INVALID;
 		lmac->lmacid = idx;
+		lmac->lmac_type = BGX_MODE_INVALID;
+		lmac->use_training = false;
 	}
 
 	/* It is assumed that low level firmware sets this value */
 	bgx->lmac_count = bgx_reg_read(bgx, 0, BGX_CMR_RX_LMACS) & 0x7;
-	if (bgx->lmac_count > MAX_LMAC_PER_BGX)
-		bgx->lmac_count = MAX_LMAC_PER_BGX;
+	if (bgx->lmac_count > bgx->max_lmac)
+		bgx->lmac_count = bgx->max_lmac;
 
-	for (idx = 0; idx < MAX_LMAC_PER_BGX; idx++)
+	for (idx = 0; idx < bgx->max_lmac; idx++)
 		bgx_set_lmac_config(bgx, idx);
 
-	if (!bgx->is_81xx) {
+	if (!bgx->is_81xx || bgx->is_rgx) {
 		bgx_print_qlm_mode(bgx, 0);
 		return;
 	}
@@ -1140,7 +1169,7 @@ static int bgx_init_of_phy(struct bgx *bgx)
 		}
 
 		lmac++;
-		if (lmac == MAX_LMAC_PER_BGX) {
+		if (lmac == bgx->max_lmac) {
 			of_node_put(node);
 			break;
 		}
@@ -1218,10 +1247,22 @@ static int bgx_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		err = -ENOMEM;
 		goto err_release_regions;
 	}
-	bgx->bgx_id = (pci_resource_start(pdev, PCI_CFG_REG_BAR_NUM) >> 24) & 1;
-	bgx->bgx_id += nic_get_node_id(pdev) * MAX_BGX_PER_CN88XX;
 
-	bgx_vnic[bgx->bgx_id] = bgx;
+	pci_read_config_word(pdev, PCI_DEVICE_ID, &sdevid);
+	if (sdevid != PCI_DEVICE_ID_THUNDER_RGX) {
+		bgx->bgx_id =
+		    (pci_resource_start(pdev, PCI_CFG_REG_BAR_NUM) >> 24) & 1;
+		bgx->bgx_id += nic_get_node_id(pdev) * MAX_BGX_PER_CN88XX;
+		bgx->max_lmac = MAX_LMAC_PER_BGX;
+		bgx_vnic[bgx->bgx_id] = bgx;
+	} else {
+		bgx->is_rgx = true;
+		bgx->max_lmac = 1;
+		bgx->bgx_id = MAX_BGX_PER_CN81XX - 1;
+		bgx_vnic[bgx->bgx_id] = bgx;
+		xcv_init_hw();
+	}
+
 	bgx_get_qlm_mode(bgx);
 
 	err = bgx_init_phy(bgx);
diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.h b/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
index 0705863..6225ff4 100644
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
@@ -11,6 +11,7 @@
 
 /* PCI device ID */
 #define	PCI_DEVICE_ID_THUNDER_BGX		0xA026
+#define	PCI_DEVICE_ID_THUNDER_RGX		0xA054
 
 /* Subsystem device IDs */
 #define PCI_SUBSYS_DEVID_88XX_BGX		0xA126
@@ -19,7 +20,7 @@
 
 #define    MAX_BGX_THUNDER			8 /* Max 4 nodes, 2 per node */
 #define    MAX_BGX_PER_CN88XX			2
-#define    MAX_BGX_PER_CN81XX			2
+#define    MAX_BGX_PER_CN81XX			3 /* 2 BGXs + 1 RGX */
 #define    MAX_BGX_PER_CN83XX			4
 #define    MAX_LMAC_PER_BGX			4
 #define    MAX_BGX_CHANS_PER_LMAC		16
@@ -205,6 +206,9 @@ void bgx_set_lmac_mac(int node, int bgx_idx, int lmacid, const u8 *mac);
 void bgx_get_lmac_link_state(int node, int bgx_idx, int lmacid, void *status);
 void bgx_lmac_internal_loopback(int node, int bgx_idx,
 				int lmac_idx, bool enable);
+void xcv_init_hw(void);
+void xcv_setup_link(bool link_up, int link_speed);
+
 u64 bgx_get_rx_stats(int node, int bgx_idx, int lmac, int idx);
 u64 bgx_get_tx_stats(int node, int bgx_idx, int lmac, int idx);
 #define BGX_RX_STATS_COUNT 11
diff --git a/drivers/net/ethernet/cavium/thunder/thunder_xcv.c b/drivers/net/ethernet/cavium/thunder/thunder_xcv.c
new file mode 100644
index 0000000..9210d04
--- /dev/null
+++ b/drivers/net/ethernet/cavium/thunder/thunder_xcv.c
@@ -0,0 +1,237 @@
+/*
+ * Copyright (C) 2016 Cavium, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ */
+
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/phy.h>
+#include <linux/of.h>
+#include <linux/of_mdio.h>
+#include <linux/of_net.h>
+
+#include "nic.h"
+#include "thunder_bgx.h"
+
+#define DRV_NAME	"thunder-xcv"
+#define DRV_VERSION	"1.0"
+
+/* Register offsets */
+#define XCV_RESET		0x00
+#define   PORT_EN		BIT_ULL(63)
+#define   CLK_RESET		BIT_ULL(15)
+#define   DLL_RESET		BIT_ULL(11)
+#define   COMP_EN		BIT_ULL(7)
+#define   TX_PKT_RESET		BIT_ULL(3)
+#define   TX_DATA_RESET		BIT_ULL(2)
+#define   RX_PKT_RESET		BIT_ULL(1)
+#define   RX_DATA_RESET		BIT_ULL(0)
+#define XCV_DLL_CTL		0x10
+#define   CLKRX_BYP		BIT_ULL(23)
+#define   CLKTX_BYP		BIT_ULL(15)
+#define XCV_COMP_CTL		0x20
+#define   DRV_BYP		BIT_ULL(63)
+#define XCV_CTL			0x30
+#define XCV_INT			0x40
+#define XCV_INT_W1S		0x48
+#define XCV_INT_ENA_W1C		0x50
+#define XCV_INT_ENA_W1S		0x58
+#define XCV_INBND_STATUS	0x80
+#define XCV_BATCH_CRD_RET	0x100
+
+struct xcv {
+	void __iomem		*reg_base;
+	struct pci_dev		*pdev;
+};
+
+static struct xcv *xcv;
+
+/* Supported devices */
+static const struct pci_device_id xcv_id_table[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xA056) },
+	{ 0, }  /* end of table */
+};
+
+MODULE_AUTHOR("Cavium Inc");
+MODULE_DESCRIPTION("Cavium Thunder RGX/XCV Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION(DRV_VERSION);
+MODULE_DEVICE_TABLE(pci, xcv_id_table);
+
+void xcv_init_hw(void)
+{
+	u64  cfg;
+
+	/* Take DLL out of reset */
+	cfg = readq_relaxed(xcv->reg_base + XCV_RESET);
+	cfg &= ~DLL_RESET;
+	writeq_relaxed(cfg, xcv->reg_base + XCV_RESET);
+
+	/* Take clock tree out of reset */
+	cfg = readq_relaxed(xcv->reg_base + XCV_RESET);
+	cfg &= ~CLK_RESET;
+	writeq_relaxed(cfg, xcv->reg_base + XCV_RESET);
+	/* Wait for DLL to lock */
+	msleep(1);
+
+	/* Configure DLL - enable or bypass
+	 * TX no bypass, RX bypass
+	 */
+	cfg = readq_relaxed(xcv->reg_base + XCV_DLL_CTL);
+	cfg &= ~0xFF03;
+	cfg |= CLKRX_BYP;
+	writeq_relaxed(cfg, xcv->reg_base + XCV_DLL_CTL);
+
+	/* Enable compensation controller and force the
+	 * write to be visible to HW by readig back.
+	 */
+	cfg = readq_relaxed(xcv->reg_base + XCV_RESET);
+	cfg |= COMP_EN;
+	writeq_relaxed(cfg, xcv->reg_base + XCV_RESET);
+	readq_relaxed(xcv->reg_base + XCV_RESET);
+	/* Wait for compensation state machine to lock */
+	msleep(10);
+
+	/* enable the XCV block */
+	cfg = readq_relaxed(xcv->reg_base + XCV_RESET);
+	cfg |= PORT_EN;
+	writeq_relaxed(cfg, xcv->reg_base + XCV_RESET);
+
+	cfg = readq_relaxed(xcv->reg_base + XCV_RESET);
+	cfg |= CLK_RESET;
+	writeq_relaxed(cfg, xcv->reg_base + XCV_RESET);
+}
+EXPORT_SYMBOL(xcv_init_hw);
+
+void xcv_setup_link(bool link_up, int link_speed)
+{
+	u64  cfg;
+	int speed = 2;
+
+	if (!xcv) {
+		dev_err(&xcv->pdev->dev,
+			"XCV init not done, probe may have failed\n");
+		return;
+	}
+
+	if (link_speed == 100)
+		speed = 1;
+	else if (link_speed == 10)
+		speed = 0;
+
+	if (link_up) {
+		/* set operating speed */
+		cfg = readq_relaxed(xcv->reg_base + XCV_CTL);
+		cfg &= ~0x03;
+		cfg |= speed;
+		writeq_relaxed(cfg, xcv->reg_base + XCV_CTL);
+
+		/* Reset datapaths */
+		cfg = readq_relaxed(xcv->reg_base + XCV_RESET);
+		cfg |= TX_DATA_RESET | RX_DATA_RESET;
+		writeq_relaxed(cfg, xcv->reg_base + XCV_RESET);
+
+		/* Enable the packet flow */
+		cfg = readq_relaxed(xcv->reg_base + XCV_RESET);
+		cfg |= TX_PKT_RESET | RX_PKT_RESET;
+		writeq_relaxed(cfg, xcv->reg_base + XCV_RESET);
+
+		/* Return credits to RGX */
+		writeq_relaxed(0x01, xcv->reg_base + XCV_BATCH_CRD_RET);
+	} else {
+		/* Disable packet flow */
+		cfg = readq_relaxed(xcv->reg_base + XCV_RESET);
+		cfg &= ~(TX_PKT_RESET | RX_PKT_RESET);
+		writeq_relaxed(cfg, xcv->reg_base + XCV_RESET);
+		readq_relaxed(xcv->reg_base + XCV_RESET);
+	}
+}
+EXPORT_SYMBOL(xcv_setup_link);
+
+static int xcv_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	int err;
+	struct device *dev = &pdev->dev;
+
+	xcv = devm_kzalloc(dev, sizeof(struct xcv), GFP_KERNEL);
+	if (!xcv)
+		return -ENOMEM;
+	xcv->pdev = pdev;
+
+	pci_set_drvdata(pdev, xcv);
+
+	err = pci_enable_device(pdev);
+	if (err) {
+		dev_err(dev, "Failed to enable PCI device\n");
+		goto err_kfree;
+	}
+
+	err = pci_request_regions(pdev, DRV_NAME);
+	if (err) {
+		dev_err(dev, "PCI request regions failed 0x%x\n", err);
+		goto err_disable_device;
+	}
+
+	/* MAP configuration registers */
+	xcv->reg_base = pcim_iomap(pdev, PCI_CFG_REG_BAR_NUM, 0);
+	if (!xcv->reg_base) {
+		dev_err(dev, "XCV: Cannot map CSR memory space, aborting\n");
+		err = -ENOMEM;
+		goto err_release_regions;
+	}
+
+	return 0;
+
+err_release_regions:
+	pci_release_regions(pdev);
+err_disable_device:
+	pci_disable_device(pdev);
+err_kfree:
+	pci_set_drvdata(pdev, NULL);
+	devm_kfree(dev, xcv);
+	xcv = NULL;
+	return err;
+}
+
+static void xcv_remove(struct pci_dev *pdev)
+{
+	struct device *dev = &pdev->dev;
+
+	if (xcv) {
+		devm_kfree(dev, xcv);
+		xcv = NULL;
+	}
+
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+	pci_set_drvdata(pdev, NULL);
+}
+
+static struct pci_driver xcv_driver = {
+	.name = DRV_NAME,
+	.id_table = xcv_id_table,
+	.probe = xcv_probe,
+	.remove = xcv_remove,
+};
+
+static int __init xcv_init_module(void)
+{
+	pr_info("%s, ver %s\n", DRV_NAME, DRV_VERSION);
+
+	return pci_register_driver(&xcv_driver);
+}
+
+static void __exit xcv_cleanup_module(void)
+{
+	pci_unregister_driver(&xcv_driver);
+}
+
+module_init(xcv_init_module);
+module_exit(xcv_cleanup_module);
-- 
2.7.4