igc: Add HW initialization code

Add code for hardware initialization and reset
Add code for semaphore handling
Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/igc/Makefile

@@ -7,4 +7,4 @@
 
 obj-$(CONFIG_IGC) += igc.o
 
-igc-objs := igc_main.o igc_mac.o igc_base.o
+igc-objs := igc_main.o igc_mac.o igc_i225.o igc_base.o

drivers/net/ethernet/intel/igc/igc_base.c

@@ -5,6 +5,184 @@
 
 #include "igc_hw.h"
 #include "igc_i225.h"
+#include "igc_mac.h"
+#include "igc_base.h"
+#include "igc.h"
+
+/**
+ * igc_set_pcie_completion_timeout - set pci-e completion timeout
+ * @hw: pointer to the HW structure
+ */
+static s32 igc_set_pcie_completion_timeout(struct igc_hw *hw)
+{
+	u32 gcr = rd32(IGC_GCR);
+	u16 pcie_devctl2;
+	s32 ret_val = 0;
+
+	/* only take action if timeout value is defaulted to 0 */
+	if (gcr & IGC_GCR_CMPL_TMOUT_MASK)
+		goto out;
+
+	/* if capabilities version is type 1 we can write the
+	 * timeout of 10ms to 200ms through the GCR register
+	 */
+	if (!(gcr & IGC_GCR_CAP_VER2)) {
+		gcr |= IGC_GCR_CMPL_TMOUT_10ms;
+		goto out;
+	}
+
+	/* for version 2 capabilities we need to write the config space
+	 * directly in order to set the completion timeout value for
+	 * 16ms to 55ms
+	 */
+	ret_val = igc_read_pcie_cap_reg(hw, PCIE_DEVICE_CONTROL2,
+					&pcie_devctl2);
+	if (ret_val)
+		goto out;
+
+	pcie_devctl2 |= PCIE_DEVICE_CONTROL2_16ms;
+
+	ret_val = igc_write_pcie_cap_reg(hw, PCIE_DEVICE_CONTROL2,
+					 &pcie_devctl2);
+out:
+	/* disable completion timeout resend */
+	gcr &= ~IGC_GCR_CMPL_TMOUT_RESEND;
+
+	wr32(IGC_GCR, gcr);
+
+	return ret_val;
+}
+
+/**
+ * igc_reset_hw_base - Reset hardware
+ * @hw: pointer to the HW structure
+ *
+ * This resets the hardware into a known state.  This is a
+ * function pointer entry point called by the api module.
+ */
+static s32 igc_reset_hw_base(struct igc_hw *hw)
+{
+	s32 ret_val;
+	u32 ctrl;
+
+	/* Prevent the PCI-E bus from sticking if there is no TLP connection
+	 * on the last TLP read/write transaction when MAC is reset.
+	 */
+	ret_val = igc_disable_pcie_master(hw);
+	if (ret_val)
+		hw_dbg("PCI-E Master disable polling has failed.\n");
+
+	/* set the completion timeout for interface */
+	ret_val = igc_set_pcie_completion_timeout(hw);
+	if (ret_val)
+		hw_dbg("PCI-E Set completion timeout has failed.\n");
+
+	hw_dbg("Masking off all interrupts\n");
+	wr32(IGC_IMC, 0xffffffff);
+
+	wr32(IGC_RCTL, 0);
+	wr32(IGC_TCTL, IGC_TCTL_PSP);
+	wrfl();
+
+	usleep_range(10000, 20000);
+
+	ctrl = rd32(IGC_CTRL);
+
+	hw_dbg("Issuing a global reset to MAC\n");
+	wr32(IGC_CTRL, ctrl | IGC_CTRL_RST);
+
+	ret_val = igc_get_auto_rd_done(hw);
+	if (ret_val) {
+		/* When auto config read does not complete, do not
+		 * return with an error. This can happen in situations
+		 * where there is no eeprom and prevents getting link.
+		 */
+		hw_dbg("Auto Read Done did not complete\n");
+	}
+
+	/* Clear any pending interrupt events. */
+	wr32(IGC_IMC, 0xffffffff);
+	rd32(IGC_ICR);
+
+	return ret_val;
+}
+
+/**
+ * igc_init_mac_params_base - Init MAC func ptrs.
+ * @hw: pointer to the HW structure
+ */
+static s32 igc_init_mac_params_base(struct igc_hw *hw)
+{
+	struct igc_mac_info *mac = &hw->mac;
+
+	/* Set mta register count */
+	mac->mta_reg_count = 128;
+	mac->rar_entry_count = IGC_RAR_ENTRIES;
+
+	/* reset */
+	mac->ops.reset_hw = igc_reset_hw_base;
+
+	mac->ops.acquire_swfw_sync = igc_acquire_swfw_sync_i225;
+	mac->ops.release_swfw_sync = igc_release_swfw_sync_i225;
+
+	return 0;
+}
+
+static s32 igc_get_invariants_base(struct igc_hw *hw)
+{
+	u32 link_mode = 0;
+	u32 ctrl_ext = 0;
+	s32 ret_val = 0;
+
+	ctrl_ext = rd32(IGC_CTRL_EXT);
+	link_mode = ctrl_ext & IGC_CTRL_EXT_LINK_MODE_MASK;
+
+	/* mac initialization and operations */
+	ret_val = igc_init_mac_params_base(hw);
+	if (ret_val)
+		goto out;
+
+out:
+	return ret_val;
+}
+
+/**
+ * igc_init_hw_base - Initialize hardware
+ * @hw: pointer to the HW structure
+ *
+ * This inits the hardware readying it for operation.
+ */
+static s32 igc_init_hw_base(struct igc_hw *hw)
+{
+	struct igc_mac_info *mac = &hw->mac;
+	u16 i, rar_count = mac->rar_entry_count;
+	s32 ret_val = 0;
+
+	/* Setup the receive address */
+	igc_init_rx_addrs(hw, rar_count);
+
+	/* Zero out the Multicast HASH table */
+	hw_dbg("Zeroing the MTA\n");
+	for (i = 0; i < mac->mta_reg_count; i++)
+		array_wr32(IGC_MTA, i, 0);
+
+	/* Zero out the Unicast HASH table */
+	hw_dbg("Zeroing the UTA\n");
+	for (i = 0; i < mac->uta_reg_count; i++)
+		array_wr32(IGC_UTA, i, 0);
+
+	/* Setup link and flow control */
+	ret_val = igc_setup_link(hw);
+
+	/* Clear all of the statistics registers (clear on read).  It is
+	 * important that we do this after we have tried to establish link
+	 * because the symbol error count will increment wildly if there
+	 * is no link.
+	 */
+	igc_clear_hw_cntrs_base(hw);
+
+	return ret_val;
+}
 
 /**
  * igc_rx_fifo_flush_base - Clean rx fifo after Rx enable
@@ -81,3 +259,12 @@ void igc_rx_fifo_flush_base(struct igc_hw *hw)
 	rd32(IGC_RNBC);
 	rd32(IGC_MPC);
 }
+
+static struct igc_mac_operations igc_mac_ops_base = {
+	.init_hw		= igc_init_hw_base,
+};
+
+const struct igc_info igc_base_info = {
+	.get_invariants		= igc_get_invariants_base,
+	.mac_ops		= &igc_mac_ops_base,
+};

drivers/net/ethernet/intel/igc/igc_base.h

@@ -33,6 +33,8 @@ union igc_adv_tx_desc {
 #define IGC_ADVTXD_DCMD_TSE	0x80000000 /* TCP Seg enable */
 #define IGC_ADVTXD_PAYLEN_SHIFT	14 /* Adv desc PAYLEN shift */
 
+#define IGC_RAR_ENTRIES		16
+
 struct igc_adv_data_desc {
 	__le64 buffer_addr;    /* Address of the descriptor's data buffer */
 	union {

drivers/net/ethernet/intel/igc/igc_defines.h

@@ -10,6 +10,22 @@
 #define PCIE_DEVICE_CONTROL2		0x28
 #define PCIE_DEVICE_CONTROL2_16ms	0x0005
 
+/* Physical Func Reset Done Indication */
+#define IGC_CTRL_EXT_LINK_MODE_MASK	0x00C00000
+
+/* Number of 100 microseconds we wait for PCI Express master disable */
+#define MASTER_DISABLE_TIMEOUT		800
+/*Blocks new Master requests */
+#define IGC_CTRL_GIO_MASTER_DISABLE	0x00000004
+/* Status of Master requests. */
+#define IGC_STATUS_GIO_MASTER_ENABLE	0x00080000
+
+/* PCI Express Control */
+#define IGC_GCR_CMPL_TMOUT_MASK		0x0000F000
+#define IGC_GCR_CMPL_TMOUT_10ms		0x00001000
+#define IGC_GCR_CMPL_TMOUT_RESEND	0x00010000
+#define IGC_GCR_CAP_VER2		0x00040000
+
 /* Receive Address
  * Number of high/low register pairs in the RAR. The RAR (Receive Address
  * Registers) holds the directed and multicast addresses that we monitor.
@@ -28,10 +44,23 @@
 #define IGC_ERR_PARAM			4
 #define IGC_ERR_MAC_INIT		5
 #define IGC_ERR_RESET			9
+#define IGC_ERR_MASTER_REQUESTS_PENDING	10
+#define IGC_ERR_SWFW_SYNC		13
+
+/* Device Control */
+#define IGC_CTRL_RST		0x04000000  /* Global reset */
 
 /* PBA constants */
 #define IGC_PBA_34K		0x0022
 
+/* SW Semaphore Register */
+#define IGC_SWSM_SMBI		0x00000001 /* Driver Semaphore bit */
+#define IGC_SWSM_SWESMBI	0x00000002 /* FW Semaphore bit */
+
+/* Number of milliseconds for NVM auto read done after MAC reset. */
+#define AUTO_READ_DONE_TIMEOUT		10
+#define IGC_EECD_AUTO_RD		0x00000200  /* NVM Auto Read done */
+
 /* Device Status */
 #define IGC_STATUS_FD		0x00000001      /* Full duplex.0=half,1=full */
 #define IGC_STATUS_LU		0x00000002      /* Link up.0=no,1=link */
@@ -118,6 +147,13 @@
 #define IGC_CT_SHIFT			4
 #define IGC_COLLISION_THRESHOLD		15
 
+/* Flow Control Constants */
+#define FLOW_CONTROL_ADDRESS_LOW	0x00C28001
+#define FLOW_CONTROL_ADDRESS_HIGH	0x00000100
+#define FLOW_CONTROL_TYPE		0x8808
+/* Enable XON frame transmission */
+#define IGC_FCRTL_XONE			0x80000000
+
 /* Management Control */
 #define IGC_MANC_RCV_TCO_EN	0x00020000 /* Receive TCO Packets Enabled */
 

drivers/net/ethernet/intel/igc/igc_hw.h

@@ -6,6 +6,8 @@
 
 #include <linux/types.h>
 #include <linux/if_ether.h>
+#include <linux/netdevice.h>
+
 #include "igc_regs.h"
 #include "igc_defines.h"
 #include "igc_mac.h"
@@ -17,6 +19,16 @@
 
 /* Function pointers for the MAC. */
 struct igc_mac_operations {
+	s32 (*check_for_link)(struct igc_hw *hw);
+	s32 (*reset_hw)(struct igc_hw *hw);
+	s32 (*init_hw)(struct igc_hw *hw);
+	s32 (*setup_physical_interface)(struct igc_hw *hw);
+	void (*rar_set)(struct igc_hw *hw, u8 *address, u32 index);
+	s32 (*read_mac_addr)(struct igc_hw *hw);
+	s32 (*get_speed_and_duplex)(struct igc_hw *hw, u16 *speed,
+				    u16 *duplex);
+	s32 (*acquire_swfw_sync)(struct igc_hw *hw, u16 mask);
+	void (*release_swfw_sync)(struct igc_hw *hw, u16 mask);
 };
 
 enum igc_mac_type {
@@ -31,6 +43,19 @@ enum igc_phy_type {
 	igc_phy_i225,
 };
 
+enum igc_nvm_type {
+	igc_nvm_unknown = 0,
+	igc_nvm_flash_hw,
+	igc_nvm_invm,
+};
+
+struct igc_info {
+	s32 (*get_invariants)(struct igc_hw *hw);
+	struct igc_mac_operations *mac_ops;
+	const struct igc_phy_operations *phy_ops;
+	struct igc_nvm_operations *nvm_ops;
+};
+
 struct igc_mac_info {
 	struct igc_mac_operations ops;
 
@@ -63,11 +88,61 @@ struct igc_mac_info {
 	bool get_link_status;
 };
 
+struct igc_nvm_operations {
+	s32 (*acquire)(struct igc_hw *hw);
+	s32 (*read)(struct igc_hw *hw, u16 offset, u16 i, u16 *data);
+	void (*release)(struct igc_hw *hw);
+	s32 (*write)(struct igc_hw *hw, u16 offset, u16 i, u16 *data);
+	s32 (*update)(struct igc_hw *hw);
+	s32 (*validate)(struct igc_hw *hw);
+	s32 (*valid_led_default)(struct igc_hw *hw, u16 *data);
+};
+
+struct igc_nvm_info {
+	struct igc_nvm_operations ops;
+	enum igc_nvm_type type;
+
+	u32 flash_bank_size;
+	u32 flash_base_addr;
+
+	u16 word_size;
+	u16 delay_usec;
+	u16 address_bits;
+	u16 opcode_bits;
+	u16 page_size;
+};
+
 struct igc_bus_info {
 	u16 func;
 	u16 pci_cmd_word;
 };
 
+enum igc_fc_mode {
+	igc_fc_none = 0,
+	igc_fc_rx_pause,
+	igc_fc_tx_pause,
+	igc_fc_full,
+	igc_fc_default = 0xFF
+};
+
+struct igc_fc_info {
+	u32 high_water;     /* Flow control high-water mark */
+	u32 low_water;      /* Flow control low-water mark */
+	u16 pause_time;     /* Flow control pause timer */
+	bool send_xon;      /* Flow control send XON */
+	bool strict_ieee;   /* Strict IEEE mode */
+	enum igc_fc_mode current_mode; /* Type of flow control */
+	enum igc_fc_mode requested_mode;
+};
+
+struct igc_dev_spec_base {
+	bool global_device_reset;
+	bool eee_disable;
+	bool clear_semaphore_once;
+	bool module_plugged;
+	u8 media_port;
+};
+
 struct igc_hw {
 	void *back;
 
@@ -75,9 +150,15 @@ struct igc_hw {
 	unsigned long io_base;
 
 	struct igc_mac_info  mac;
+	struct igc_fc_info   fc;
+	struct igc_nvm_info  nvm;
 
 	struct igc_bus_info bus;
 
+	union {
+		struct igc_dev_spec_base	_base;
+	} dev_spec;
+
 	u16 device_id;
 	u16 subsystem_vendor_id;
 	u16 subsystem_device_id;
@@ -170,6 +251,10 @@ struct igc_hw_stats {
 	u64 b2ogprc;
 };
 
+struct net_device *igc_get_hw_dev(struct igc_hw *hw);
+#define hw_dbg(format, arg...) \
+	netdev_dbg(igc_get_hw_dev(hw), format, ##arg)
+
 s32  igc_read_pcie_cap_reg(struct igc_hw *hw, u32 reg, u16 *value);
 s32  igc_write_pcie_cap_reg(struct igc_hw *hw, u32 reg, u16 *value);
 void igc_read_pci_cfg(struct igc_hw *hw, u32 reg, u16 *value);

drivers/net/ethernet/intel/igc/igc_i225.c

+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c)  2018 Intel Corporation */
+
+#include <linux/delay.h>
+
+#include "igc_hw.h"
+
+/**
+ * igc_get_hw_semaphore_i225 - Acquire hardware semaphore
+ * @hw: pointer to the HW structure
+ *
+ * Acquire the HW semaphore to access the PHY or NVM
+ */
+static s32 igc_get_hw_semaphore_i225(struct igc_hw *hw)
+{
+	s32 timeout = hw->nvm.word_size + 1;
+	s32 i = 0;
+	u32 swsm;
+
+	/* Get the SW semaphore */
+	while (i < timeout) {
+		swsm = rd32(IGC_SWSM);
+		if (!(swsm & IGC_SWSM_SMBI))
+			break;
+
+		usleep_range(500, 600);
+		i++;
+	}
+
+	if (i == timeout) {
+		/* In rare circumstances, the SW semaphore may already be held
+		 * unintentionally. Clear the semaphore once before giving up.
+		 */
+		if (hw->dev_spec._base.clear_semaphore_once) {
+			hw->dev_spec._base.clear_semaphore_once = false;
+			igc_put_hw_semaphore(hw);
+			for (i = 0; i < timeout; i++) {
+				swsm = rd32(IGC_SWSM);
+				if (!(swsm & IGC_SWSM_SMBI))
+					break;
+
+				usleep_range(500, 600);
+			}
+		}
+
+		/* If we do not have the semaphore here, we have to give up. */
+		if (i == timeout) {
+			hw_dbg("Driver can't access device - SMBI bit is set.\n");
+			return -IGC_ERR_NVM;
+		}
+	}
+
+	/* Get the FW semaphore. */
+	for (i = 0; i < timeout; i++) {
+		swsm = rd32(IGC_SWSM);
+		wr32(IGC_SWSM, swsm | IGC_SWSM_SWESMBI);
+
+		/* Semaphore acquired if bit latched */
+		if (rd32(IGC_SWSM) & IGC_SWSM_SWESMBI)
+			break;
+
+		usleep_range(500, 600);
+	}
+
+	if (i == timeout) {
+		/* Release semaphores */
+		igc_put_hw_semaphore(hw);
+		hw_dbg("Driver can't access the NVM\n");
+		return -IGC_ERR_NVM;
+	}
+
+	return 0;
+}
+
+/**
+ * igc_acquire_swfw_sync_i225 - Acquire SW/FW semaphore
+ * @hw: pointer to the HW structure
+ * @mask: specifies which semaphore to acquire
+ *
+ * Acquire the SW/FW semaphore to access the PHY or NVM.  The mask
+ * will also specify which port we're acquiring the lock for.
+ */
+s32 igc_acquire_swfw_sync_i225(struct igc_hw *hw, u16 mask)
+{
+	s32 i = 0, timeout = 200;
+	u32 fwmask = mask << 16;
+	u32 swmask = mask;
+	s32 ret_val = 0;
+	u32 swfw_sync;
+
+	while (i < timeout) {
+		if (igc_get_hw_semaphore_i225(hw)) {
+			ret_val = -IGC_ERR_SWFW_SYNC;
+			goto out;
+		}
+
+		swfw_sync = rd32(IGC_SW_FW_SYNC);
+		if (!(swfw_sync & (fwmask | swmask)))
+			break;
+
+		/* Firmware currently using resource (fwmask) */
+		igc_put_hw_semaphore(hw);
+		mdelay(5);
+		i++;
+	}
+
+	if (i == timeout) {
+		hw_dbg("Driver can't access resource, SW_FW_SYNC timeout.\n");
+		ret_val = -IGC_ERR_SWFW_SYNC;
+		goto out;
+	}
+
+	swfw_sync |= swmask;
+	wr32(IGC_SW_FW_SYNC, swfw_sync);
+
+	igc_put_hw_semaphore(hw);
+out:
+	return ret_val;
+}
+
+/**
+ * igc_release_swfw_sync_i225 - Release SW/FW semaphore
+ * @hw: pointer to the HW structure
+ * @mask: specifies which semaphore to acquire
+ *
+ * Release the SW/FW semaphore used to access the PHY or NVM.  The mask
+ * will also specify which port we're releasing the lock for.
+ */
+void igc_release_swfw_sync_i225(struct igc_hw *hw, u16 mask)
+{
+	u32 swfw_sync;
+
+	while (igc_get_hw_semaphore_i225(hw))
+		; /* Empty */
+
+	swfw_sync = rd32(IGC_SW_FW_SYNC);
+	swfw_sync &= ~mask;
+	wr32(IGC_SW_FW_SYNC, swfw_sync);
+
+	igc_put_hw_semaphore(hw);
+}

drivers/net/ethernet/intel/igc/igc_mac.c

@@ -2,4 +2,319 @@
 /* Copyright (c)  2018 Intel Corporation */
 
 #include <linux/pci.h>
+#include <linux/delay.h>
+
+#include "igc_mac.h"
 #include "igc_hw.h"
+
+/* forward declaration */
+static s32 igc_set_default_fc(struct igc_hw *hw);
+static s32 igc_set_fc_watermarks(struct igc_hw *hw);
+
+/**
+ * igc_disable_pcie_master - Disables PCI-express master access
+ * @hw: pointer to the HW structure
+ *
+ * Returns 0 (0) if successful, else returns -10
+ * (-IGC_ERR_MASTER_REQUESTS_PENDING) if master disable bit has not caused
+ * the master requests to be disabled.
+ *
+ * Disables PCI-Express master access and verifies there are no pending
+ * requests.
+ */
+s32 igc_disable_pcie_master(struct igc_hw *hw)
+{
+	s32 timeout = MASTER_DISABLE_TIMEOUT;
+	s32 ret_val = 0;
+	u32 ctrl;
+
+	ctrl = rd32(IGC_CTRL);
+	ctrl |= IGC_CTRL_GIO_MASTER_DISABLE;
+	wr32(IGC_CTRL, ctrl);
+
+	while (timeout) {
+		if (!(rd32(IGC_STATUS) &
+		    IGC_STATUS_GIO_MASTER_ENABLE))
+			break;
+		usleep_range(2000, 3000);
+		timeout--;
+	}
+
+	if (!timeout) {
+		hw_dbg("Master requests are pending.\n");
+		ret_val = -IGC_ERR_MASTER_REQUESTS_PENDING;
+		goto out;
+	}
+
+out:
+	return ret_val;
+}
+
+/**
+ * igc_init_rx_addrs - Initialize receive addresses
+ * @hw: pointer to the HW structure
+ * @rar_count: receive address registers
+ *
+ * Setup the receive address registers by setting the base receive address
+ * register to the devices MAC address and clearing all the other receive
+ * address registers to 0.
+ */
+void igc_init_rx_addrs(struct igc_hw *hw, u16 rar_count)
+{
+	u8 mac_addr[ETH_ALEN] = {0};
+	u32 i;
+
+	/* Setup the receive address */
+	hw_dbg("Programming MAC Address into RAR[0]\n");
+
+	hw->mac.ops.rar_set(hw, hw->mac.addr, 0);
+
+	/* Zero out the other (rar_entry_count - 1) receive addresses */
+	hw_dbg("Clearing RAR[1-%u]\n", rar_count - 1);
+	for (i = 1; i < rar_count; i++)
+		hw->mac.ops.rar_set(hw, mac_addr, i);
+}
+
+/**
+ * igc_setup_link - Setup flow control and link settings
+ * @hw: pointer to the HW structure
+ *
+ * Determines which flow control settings to use, then configures flow
+ * control.  Calls the appropriate media-specific link configuration
+ * function.  Assuming the adapter has a valid link partner, a valid link
+ * should be established.  Assumes the hardware has previously been reset
+ * and the transmitter and receiver are not enabled.
+ */
+s32 igc_setup_link(struct igc_hw *hw)
+{
+	s32 ret_val = 0;
+
+	/* In the case of the phy reset being blocked, we already have a link.
+	 * We do not need to set it up again.
+	 */
+
+	/* If requested flow control is set to default, set flow control
+	 * based on the EEPROM flow control settings.
+	 */
+	if (hw->fc.requested_mode == igc_fc_default) {
+		ret_val = igc_set_default_fc(hw);
+		if (ret_val)
+			goto out;
+	}
+
+	/* We want to save off the original Flow Control configuration just
+	 * in case we get disconnected and then reconnected into a different
+	 * hub or switch with different Flow Control capabilities.
+	 */
+	hw->fc.current_mode = hw->fc.requested_mode;
+
+	hw_dbg("After fix-ups FlowControl is now = %x\n", hw->fc.current_mode);
+
+	/* Call the necessary media_type subroutine to configure the link. */
+	ret_val = hw->mac.ops.setup_physical_interface(hw);
+	if (ret_val)
+		goto out;
+
+	/* Initialize the flow control address, type, and PAUSE timer
+	 * registers to their default values.  This is done even if flow
+	 * control is disabled, because it does not hurt anything to
+	 * initialize these registers.
+	 */
+	hw_dbg("Initializing the Flow Control address, type and timer regs\n");
+	wr32(IGC_FCT, FLOW_CONTROL_TYPE);
+	wr32(IGC_FCAH, FLOW_CONTROL_ADDRESS_HIGH);
+	wr32(IGC_FCAL, FLOW_CONTROL_ADDRESS_LOW);
+
+	wr32(IGC_FCTTV, hw->fc.pause_time);
+
+	ret_val = igc_set_fc_watermarks(hw);
+
+out:
+	return ret_val;
+}
+
+/**
+ * igc_set_default_fc - Set flow control default values
+ * @hw: pointer to the HW structure
+ *
+ * Read the EEPROM for the default values for flow control and store the
+ * values.
+ */
+static s32 igc_set_default_fc(struct igc_hw *hw)
+{
+	return 0;
+}
+
+/**
+ * igc_set_fc_watermarks - Set flow control high/low watermarks
+ * @hw: pointer to the HW structure
+ *
+ * Sets the flow control high/low threshold (watermark) registers.  If
+ * flow control XON frame transmission is enabled, then set XON frame
+ * transmission as well.
+ */
+static s32 igc_set_fc_watermarks(struct igc_hw *hw)
+{
+	u32 fcrtl = 0, fcrth = 0;
+
+	/* Set the flow control receive threshold registers.  Normally,
+	 * these registers will be set to a default threshold that may be
+	 * adjusted later by the driver's runtime code.  However, if the
+	 * ability to transmit pause frames is not enabled, then these
+	 * registers will be set to 0.
+	 */
+	if (hw->fc.current_mode & igc_fc_tx_pause) {
+		/* We need to set up the Receive Threshold high and low water
+		 * marks as well as (optionally) enabling the transmission of
+		 * XON frames.
+		 */
+		fcrtl = hw->fc.low_water;
+		if (hw->fc.send_xon)
+			fcrtl |= IGC_FCRTL_XONE;
+
+		fcrth = hw->fc.high_water;
+	}
+	wr32(IGC_FCRTL, fcrtl);
+	wr32(IGC_FCRTH, fcrth);
+
+	return 0;
+}
+
+/**
+ * igc_clear_hw_cntrs_base - Clear base hardware counters
+ * @hw: pointer to the HW structure
+ *
+ * Clears the base hardware counters by reading the counter registers.
+ */
+void igc_clear_hw_cntrs_base(struct igc_hw *hw)
+{
+	rd32(IGC_CRCERRS);
+	rd32(IGC_SYMERRS);
+	rd32(IGC_MPC);
+	rd32(IGC_SCC);
+	rd32(IGC_ECOL);
+	rd32(IGC_MCC);
+	rd32(IGC_LATECOL);
+	rd32(IGC_COLC);
+	rd32(IGC_DC);
+	rd32(IGC_SEC);
+	rd32(IGC_RLEC);
+	rd32(IGC_XONRXC);
+	rd32(IGC_XONTXC);
+	rd32(IGC_XOFFRXC);
+	rd32(IGC_XOFFTXC);
+	rd32(IGC_FCRUC);
+	rd32(IGC_GPRC);
+	rd32(IGC_BPRC);
+	rd32(IGC_MPRC);
+	rd32(IGC_GPTC);
+	rd32(IGC_GORCL);
+	rd32(IGC_GORCH);
+	rd32(IGC_GOTCL);
+	rd32(IGC_GOTCH);
+	rd32(IGC_RNBC);
+	rd32(IGC_RUC);
+	rd32(IGC_RFC);
+	rd32(IGC_ROC);
+	rd32(IGC_RJC);
+	rd32(IGC_TORL);
+	rd32(IGC_TORH);
+	rd32(IGC_TOTL);
+	rd32(IGC_TOTH);
+	rd32(IGC_TPR);
+	rd32(IGC_TPT);
+	rd32(IGC_MPTC);
+	rd32(IGC_BPTC);
+
+	rd32(IGC_PRC64);
+	rd32(IGC_PRC127);
+	rd32(IGC_PRC255);
+	rd32(IGC_PRC511);
+	rd32(IGC_PRC1023);
+	rd32(IGC_PRC1522);
+	rd32(IGC_PTC64);
+	rd32(IGC_PTC127);
+	rd32(IGC_PTC255);
+	rd32(IGC_PTC511);
+	rd32(IGC_PTC1023);
+	rd32(IGC_PTC1522);
+
+	rd32(IGC_ALGNERRC);
+	rd32(IGC_RXERRC);
+	rd32(IGC_TNCRS);
+	rd32(IGC_CEXTERR);
+	rd32(IGC_TSCTC);
+	rd32(IGC_TSCTFC);
+
+	rd32(IGC_MGTPRC);
+	rd32(IGC_MGTPDC);
+	rd32(IGC_MGTPTC);
+
+	rd32(IGC_IAC);
+	rd32(IGC_ICRXOC);
+
+	rd32(IGC_ICRXPTC);
+	rd32(IGC_ICRXATC);
+	rd32(IGC_ICTXPTC);
+	rd32(IGC_ICTXATC);
+	rd32(IGC_ICTXQEC);
+	rd32(IGC_ICTXQMTC);
+	rd32(IGC_ICRXDMTC);
+
+	rd32(IGC_CBTMPC);
+	rd32(IGC_HTDPMC);
+	rd32(IGC_CBRMPC);
+	rd32(IGC_RPTHC);
+	rd32(IGC_HGPTC);
+	rd32(IGC_HTCBDPC);
+	rd32(IGC_HGORCL);
+	rd32(IGC_HGORCH);
+	rd32(IGC_HGOTCL);
+	rd32(IGC_HGOTCH);
+	rd32(IGC_LENERRS);
+}
+
+/**
+ * igc_get_auto_rd_done - Check for auto read completion
+ * @hw: pointer to the HW structure
+ *
+ * Check EEPROM for Auto Read done bit.
+ */
+s32 igc_get_auto_rd_done(struct igc_hw *hw)
+{
+	s32 ret_val = 0;
+	s32 i = 0;
+
+	while (i < AUTO_READ_DONE_TIMEOUT) {
+		if (rd32(IGC_EECD) & IGC_EECD_AUTO_RD)
+			break;
+		usleep_range(1000, 2000);
+		i++;
+	}
+
+	if (i == AUTO_READ_DONE_TIMEOUT) {
+		hw_dbg("Auto read by HW from NVM has not completed.\n");
+		ret_val = -IGC_ERR_RESET;
+		goto out;
+	}
+
+out:
+	return ret_val;
+}
+
+/**
+ * igc_put_hw_semaphore - Release hardware semaphore
+ * @hw: pointer to the HW structure
+ *
+ * Release hardware semaphore used to access the PHY or NVM
+ */
+void igc_put_hw_semaphore(struct igc_hw *hw)
+{
+	u32 swsm;
+
+	swsm = rd32(IGC_SWSM);
+
+	swsm &= ~(IGC_SWSM_SMBI | IGC_SWSM_SWESMBI);
+
+	wr32(IGC_SWSM, swsm);
+}

drivers/net/ethernet/intel/igc/igc_mac.h

@@ -4,8 +4,19 @@
 #ifndef _IGC_MAC_H_
 #define _IGC_MAC_H_
 
+#include "igc_hw.h"
+#include "igc_defines.h"
+
 #ifndef IGC_REMOVED
 #define IGC_REMOVED(a) (0)
 #endif /* IGC_REMOVED */
 
+/* forward declaration */
+s32 igc_disable_pcie_master(struct igc_hw *hw);
+void igc_init_rx_addrs(struct igc_hw *hw, u16 rar_count);
+s32 igc_setup_link(struct igc_hw *hw);
+void igc_clear_hw_cntrs_base(struct igc_hw *hw);
+s32 igc_get_auto_rd_done(struct igc_hw *hw);
+void igc_put_hw_semaphore(struct igc_hw *hw);
+
 #endif

drivers/net/ethernet/intel/igc/igc_main.c

@@ -64,6 +64,14 @@ enum latency_range {
 
 static void igc_reset(struct igc_adapter *adapter)
 {
+	struct pci_dev *pdev = adapter->pdev;
+	struct igc_hw *hw = &adapter->hw;
+
+	hw->mac.ops.reset_hw(hw);
+
+	if (hw->mac.ops.init_hw(hw))
+		dev_err(&pdev->dev, "Hardware Error\n");
+
 	if (!netif_running(adapter->netdev))
 		igc_power_down_link(adapter);
 }
@@ -3555,6 +3563,19 @@ static int igc_sw_init(struct igc_adapter *adapter)
 	return 0;
 }
 
+/**
+ * igc_get_hw_dev - return device
+ * @hw: pointer to hardware structure
+ *
+ * used by hardware layer to print debugging information
+ */
+struct net_device *igc_get_hw_dev(struct igc_hw *hw)
+{
+	struct igc_adapter *adapter = hw->back;
+
+	return adapter->netdev;
+}
+
 /**
  * igc_init_module - Driver Registration Routine
  *

drivers/net/ethernet/intel/igc/igc_regs.h

@@ -7,6 +7,7 @@
 /* General Register Descriptions */
 #define IGC_CTRL		0x00000  /* Device Control - RW */
 #define IGC_STATUS		0x00008  /* Device Status - RO */
+#define IGC_EECD		0x00010  /* EEPROM/Flash Control - RW */
 #define IGC_CTRL_EXT		0x00018  /* Extended Device Control - RW */
 #define IGC_MDIC		0x00020  /* MDI Control - RW */
 #define IGC_MDICNFG		0x00E04  /* MDC/MDIO Configuration - RW */
@@ -56,6 +57,23 @@
 #define IGC_IVAR_MISC		0x01740  /* IVAR for "other" causes - RW */
 #define IGC_GPIE		0x01514  /* General Purpose Intr Enable - RW */
 
+/* Interrupt Cause */
+#define IGC_ICRXPTC		0x04104  /* Rx Packet Timer Expire Count */
+#define IGC_ICRXATC		0x04108  /* Rx Absolute Timer Expire Count */
+#define IGC_ICTXPTC		0x0410C  /* Tx Packet Timer Expire Count */
+#define IGC_ICTXATC		0x04110  /* Tx Absolute Timer Expire Count */
+#define IGC_ICTXQEC		0x04118  /* Tx Queue Empty Count */
+#define IGC_ICTXQMTC		0x0411C  /* Tx Queue Min Threshold Count */
+#define IGC_ICRXDMTC		0x04120  /* Rx Descriptor Min Threshold Count */
+#define IGC_ICRXOC		0x04124  /* Receiver Overrun Count */
+
+#define IGC_CBTMPC		0x0402C  /* Circuit Breaker TX Packet Count */
+#define IGC_HTDPMC		0x0403C  /* Host Transmit Discarded Packets */
+#define IGC_CBRMPC		0x040FC  /* Circuit Breaker RX Packet Count */
+#define IGC_RPTHC		0x04104  /* Rx Packets To Host */
+#define IGC_HGPTC		0x04118  /* Host Good Packets TX Count */
+#define IGC_HTCBDPC		0x04124  /* Host TX Circ.Breaker Drop Count */
+
 /* MSI-X Table Register Descriptions */
 #define IGC_PBACL		0x05B68  /* MSIx PBA Clear - R/W 1 to clear */
 
@@ -73,6 +91,8 @@
 #define IGC_RXCSUM		0x05000  /* Rx Checksum Control - RW */
 #define IGC_RLPML		0x05004  /* Rx Long Packet Max Length */
 #define IGC_RFCTL		0x05008  /* Receive Filter Control*/
+#define IGC_MTA			0x05200  /* Multicast Table Array - RW Array */
+#define IGC_UTA			0x0A000  /* Unicast Table Array - RW */
 #define IGC_RAL(_n)		(0x05400 + ((_n) * 0x08))
 #define IGC_RAH(_n)		(0x05404 + ((_n) * 0x08))