Subject: [PATCH] net: add calxeda xgmac ethernet driver

From: Rob Herring <[email-masked]>
Date: Tue, 15 Nov 2011 20:46:51 -0600

From: Rob Herring <[email-masked]>

Add support for the XGMAC 10Gb ethernet device in the Calxeda Highbank
SOC.

Signed-off-by: Rob Herring <[email-masked]>
---
v3:
- add dma_unmap_page calls for skb frags
- use module_platform_driver
- rebase to 3.2-rc2

v2:
- use __le32 for descriptor fields and cpu_to_le32/le32_to_cpu to access
- use u32 instead of dma_addr_t for descriptor phys addresses
- improve allocation error handling for descriptor ring allocations
- convert all prints to netdev_XXX
- rebase to current Linus master
- move into drivers/net/ethernet

 .../devicetree/bindings/net/calxeda-xgmac.txt      |   16 +
 drivers/net/ethernet/Kconfig                       |    1 +
 drivers/net/ethernet/Makefile                      |    1 +
 drivers/net/ethernet/calxeda/Kconfig               |    7 +
 drivers/net/ethernet/calxeda/Makefile              |    2 +
 drivers/net/ethernet/calxeda/xgmac.c               | 1927 ++++++++++++++++++++
 6 files changed, 1954 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/net/calxeda-xgmac.txt
 create mode 100644 drivers/net/ethernet/calxeda/Kconfig
 create mode 100644 drivers/net/ethernet/calxeda/Makefile
 create mode 100644 drivers/net/ethernet/calxeda/xgmac.c

diff --git a/Documentation/devicetree/bindings/net/calxeda-xgmac.txt b/Documentation/devicetree/bindings/net/calxeda-xgmac.txt
new file mode 100644
index 0000000..c03a7bc
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/calxeda-xgmac.txt
@@ -0,0 +1,16 @@
+* Calxeda Highbank 10Gb XGMAC Ethernet
+
+Required properties:
+- compatible : Should be "calxeda,hb-xgmac"
+- reg : Address and length of the register set for the device
+- interrupts : Should contain 3 xgmac interrupts. The 1st is main interrupt.
+  The 2nd is pwr mgt interrupt. The 3rd is low power state interrupt.
+
+Example:
+
+ethernet@fff50000 {
+        compatible = "calxeda,hb-xgmac";
+        reg = <0xfff50000 0x1000>;
+        interrupts = <0 77 4  0 78 4  0 79 4>;
+};
+
diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index 597f4d4..3474a61 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -28,6 +28,7 @@ source "drivers/net/ethernet/cadence/Kconfig"
 source "drivers/net/ethernet/adi/Kconfig"
 source "drivers/net/ethernet/broadcom/Kconfig"
 source "drivers/net/ethernet/brocade/Kconfig"
+source "drivers/net/ethernet/calxeda/Kconfig"
 source "drivers/net/ethernet/chelsio/Kconfig"
 source "drivers/net/ethernet/cirrus/Kconfig"
 source "drivers/net/ethernet/cisco/Kconfig"
diff --git a/drivers/net/ethernet/Makefile b/drivers/net/ethernet/Makefile
index be5dde0..cd6d69a 100644
--- a/drivers/net/ethernet/Makefile
+++ b/drivers/net/ethernet/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_NET_ATMEL) += cadence/
 obj-$(CONFIG_NET_BFIN) += adi/
 obj-$(CONFIG_NET_VENDOR_BROADCOM) += broadcom/
 obj-$(CONFIG_NET_VENDOR_BROCADE) += brocade/
+obj-$(CONFIG_NET_CALXEDA_XGMAC) += calxeda/
 obj-$(CONFIG_NET_VENDOR_CHELSIO) += chelsio/
 obj-$(CONFIG_NET_VENDOR_CIRRUS) += cirrus/
 obj-$(CONFIG_NET_VENDOR_CISCO) += cisco/
diff --git a/drivers/net/ethernet/calxeda/Kconfig b/drivers/net/ethernet/calxeda/Kconfig
new file mode 100644
index 0000000..a52e725
--- /dev/null
+++ b/drivers/net/ethernet/calxeda/Kconfig
@@ -0,0 +1,7 @@
+config NET_CALXEDA_XGMAC
+	tristate "Calxeda 1G/10G XGMAC Ethernet driver"
+
+	select CRC32
+	help
+	  This is the driver for the XGMAC Ethernet IP block found on Calxeda
+	  Highbank platforms.
diff --git a/drivers/net/ethernet/calxeda/Makefile b/drivers/net/ethernet/calxeda/Makefile
new file mode 100644
index 0000000..5057cd2
--- /dev/null
+++ b/drivers/net/ethernet/calxeda/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_NET_CALXEDA_XGMAC) += xgmac.o
+
diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
new file mode 100644
index 0000000..dc23404
--- /dev/null
+++ b/drivers/net/ethernet/calxeda/xgmac.c
@@ -0,0 +1,1927 @@
+/*
+ * Copyright 2010-2011 Calxeda, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/circ_buf.h>
+#include <linux/interrupt.h>
+#include <linux/etherdevice.h>
+#include <linux/platform_device.h>
+#include <linux/skbuff.h>
+#include <linux/ethtool.h>
+#include <linux/if.h>
+#include <linux/crc32.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+
+/* XGMAC Register definitions */
+#define XGMAC_CONTROL		0x00000000	/* MAC Configuration */
+#define XGMAC_FRAME_FILTER	0x00000004	/* MAC Frame Filter */
+#define XGMAC_FLOW_CTRL		0x00000018	/* MAC Flow Control */
+#define XGMAC_VLAN_TAG		0x0000001C	/* VLAN Tags */
+#define XGMAC_VERSION		0x00000020	/* Version */
+#define XGMAC_VLAN_INCL		0x00000024	/* VLAN tag for tx frames */
+#define XGMAC_LPI_CTRL		0x00000028	/* LPI Control and Status */
+#define XGMAC_LPI_TIMER		0x0000002C	/* LPI Timers Control */
+#define XGMAC_TX_PACE		0x00000030	/* Transmit Pace and Stretch */
+#define XGMAC_VLAN_HASH		0x00000034	/* VLAN Hash Table */
+#define XGMAC_DEBUG		0x00000038	/* Debug */
+#define XGMAC_INT_STAT		0x0000003C	/* Interrupt and Control */
+#define XGMAC_ADDR_HIGH(reg)	(0x00000040+((reg) * 8))
+#define XGMAC_ADDR_LOW(reg)	(0x00000044+((reg) * 8))
+#define XGMAC_HASH(n)		(0x00000300 + (n) * 4) /* HASH table regs */
+#define XGMAC_NUM_HASH		16
+#define XGMAC_OMR		0x00000400
+#define XGMAC_REMOTE_WAKE	0x00000700	/* Remote Wake-Up Frm Filter */
+#define XGMAC_PMT		0x00000704	/* PMT Control and Status */
+#define XGMAC_MMC_CTRL		0x00000800	/* XGMAC MMC Control */
+#define XGMAC_MMC_INTR_RX	0x00000804	/* Recieve Interrupt */
+#define XGMAC_MMC_INTR_TX	0x00000808	/* Transmit Interrupt */
+#define XGMAC_MMC_INTR_MASK_RX	0x0000080c	/* Recieve Interrupt Mask */
+#define XGMAC_MMC_INTR_MASK_TX	0x00000810	/* Transmit Interrupt Mask */
+
+/* Hardware TX Statistics Counters */
+#define XGMAC_MMC_TXOCTET_GB_LO	0x00000814
+#define XGMAC_MMC_TXOCTET_GB_HI	0x00000818
+#define XGMAC_MMC_TXFRAME_GB_LO	0x0000081C
+#define XGMAC_MMC_TXFRAME_GB_HI	0x00000820
+#define XGMAC_MMC_TXBCFRAME_G	0x00000824
+#define XGMAC_MMC_TXMCFRAME_G	0x0000082C
+#define XGMAC_MMC_TXUCFRAME_GB	0x00000864
+#define XGMAC_MMC_TXMCFRAME_GB	0x0000086C
+#define XGMAC_MMC_TXBCFRAME_GB	0x00000874
+#define XGMAC_MMC_TXUNDERFLOW	0x0000087C
+#define XGMAC_MMC_TXOCTET_G_LO	0x00000884
+#define XGMAC_MMC_TXOCTET_G_HI	0x00000888
+#define XGMAC_MMC_TXFRAME_G_LO	0x0000088C
+#define XGMAC_MMC_TXFRAME_G_HI	0x00000890
+#define XGMAC_MMC_TXPAUSEFRAME	0x00000894
+#define XGMAC_MMC_TXVLANFRAME	0x0000089C
+
+/* Hardware RX Statistics Counters */
+#define XGMAC_MMC_RXFRAME_GB_LO	0x00000900
+#define XGMAC_MMC_RXFRAME_GB_HI	0x00000904
+#define XGMAC_MMC_RXOCTET_GB_LO	0x00000908
+#define XGMAC_MMC_RXOCTET_GB_HI	0x0000090C
+#define XGMAC_MMC_RXOCTET_G_LO	0x00000910
+#define XGMAC_MMC_RXOCTET_G_HI	0x00000914
+#define XGMAC_MMC_RXBCFRAME_G	0x00000918
+#define XGMAC_MMC_RXMCFRAME_G	0x00000920
+#define XGMAC_MMC_RXCRCERR	0x00000928
+#define XGMAC_MMC_RXRUNT	0x00000930
+#define XGMAC_MMC_RXJABBER	0x00000934
+#define XGMAC_MMC_RXUCFRAME_G	0x00000970
+#define XGMAC_MMC_RXLENGTHERR	0x00000978
+#define XGMAC_MMC_RXOVERFLOW	0x00000990
+#define XGMAC_MMC_RXPAUSEFRAME	0x00000988
+#define XGMAC_MMC_RXVLANFRAME	0x00000998
+
+/* DMA Control and Status Registers */
+#define XGMAC_DMA_BUS_MODE	0x00000f00	/* Bus Mode */
+#define XGMAC_DMA_TX_POLL	0x00000f04	/* Transmit Poll Demand */
+#define XGMAC_DMA_RX_POLL	0x00000f08	/* Received Poll Demand */
+#define XGMAC_DMA_RX_BASE_ADDR	0x00000f0c	/* Receive List Base */
+#define XGMAC_DMA_TX_BASE_ADDR	0x00000f10	/* Transmit List Base */
+#define XGMAC_DMA_STATUS	0x00000f14	/* Status Register */
+#define XGMAC_DMA_CONTROL	0x00000f18	/* Ctrl (Operational Mode) */
+#define XGMAC_DMA_INTR_ENA	0x00000f1c	/* Interrupt Enable */
+#define XGMAC_DMA_MISS_FRAME_CTR 0x00000f20	/* Missed Frame Counter */
+#define XGMAC_DMA_RI_WDOG_TIMER	0x00000f24	/* RX Intr Watchdog Timer */
+#define XGMAC_DMA_AXI_BUS	0x00000f28	/* AXI Bus Mode */
+#define XGMAC_DMA_AXI_STATUS	0x00000f2C	/* AXI Status */
+#define XGMAC_DMA_HW_FEATURE	0x00000f58	/* Enabled Hardware Features */
+
+#define XGMAC_ADDR_AE		0x80000000
+#define XGMAC_MAX_FILTER_ADDR	31
+
+/* PMT Control and Status */
+#define XGMAC_PMT_POINTER_RESET	0x80000000
+#define XGMAC_PMT_GLBL_UNICAST	0x00000200
+#define XGMAC_PMT_WAKEUP_RX_FRM	0x00000040
+#define XGMAC_PMT_MAGIC_PKT	0x00000020
+#define XGMAC_PMT_WAKEUP_FRM_EN	0x00000004
+#define XGMAC_PMT_MAGIC_PKT_EN	0x00000002
+#define XGMAC_PMT_POWERDOWN	0x00000001
+
+#define XGMAC_CONTROL_SPD	0x40000000	/* Speed control */
+#define XGMAC_CONTROL_SPD_MASK	0x60000000
+#define XGMAC_CONTROL_SPD_1G	0x60000000
+#define XGMAC_CONTROL_SPD_2_5G	0x40000000
+#define XGMAC_CONTROL_SPD_10G	0x00000000
+#define XGMAC_CONTROL_SARC	0x10000000	/* Source Addr Insert/Replace */
+#define XGMAC_CONTROL_SARK_MASK	0x18000000
+#define XGMAC_CONTROL_CAR	0x04000000	/* CRC Addition/Replacement */
+#define XGMAC_CONTROL_CAR_MASK	0x06000000
+#define XGMAC_CONTROL_DP	0x01000000	/* Disable Padding */
+#define XGMAC_CONTROL_WD	0x00800000	/* Disable Watchdog on rx */
+#define XGMAC_CONTROL_JD	0x00400000	/* Jabber disable */
+#define XGMAC_CONTROL_JE	0x00100000	/* Jumbo frame */
+#define XGMAC_CONTROL_LM	0x00001000	/* Loop-back mode */
+#define XGMAC_CONTROL_IPC	0x00000400	/* Checksum Offload */
+#define XGMAC_CONTROL_ACS	0x00000080	/* Automatic Pad/FCS Strip */
+#define XGMAC_CONTROL_DDIC	0x00000010	/* Disable Deficit Idle Count */
+#define XGMAC_CONTROL_TE	0x00000008	/* Transmitter Enable */
+#define XGMAC_CONTROL_RE	0x00000004	/* Receiver Enable */
+
+/* XGMAC Frame Filter defines */
+#define XGMAC_FRAME_FILTER_PR	0x00000001	/* Promiscuous Mode */
+#define XGMAC_FRAME_FILTER_HUC	0x00000002	/* Hash Unicast */
+#define XGMAC_FRAME_FILTER_HMC	0x00000004	/* Hash Multicast */
+#define XGMAC_FRAME_FILTER_DAIF	0x00000008	/* DA Inverse Filtering */
+#define XGMAC_FRAME_FILTER_PM	0x00000010	/* Pass all multicast */
+#define XGMAC_FRAME_FILTER_DBF	0x00000020	/* Disable Broadcast frames */
+#define XGMAC_FRAME_FILTER_SAIF	0x00000100	/* Inverse Filtering */
+#define XGMAC_FRAME_FILTER_SAF	0x00000200	/* Source Address Filter */
+#define XGMAC_FRAME_FILTER_HPF	0x00000400	/* Hash or perfect Filter */
+#define XGMAC_FRAME_FILTER_VHF	0x00000800	/* VLAN Hash Filter */
+#define XGMAC_FRAME_FILTER_VPF	0x00001000	/* VLAN Perfect Filter */
+#define XGMAC_FRAME_FILTER_RA	0x80000000	/* Receive all mode */
+
+/* XGMAC FLOW CTRL defines */
+#define XGMAC_FLOW_CTRL_PT_MASK	0xffff0000	/* Pause Time Mask */
+#define XGMAC_FLOW_CTRL_PT_SHIFT	16
+#define XGMAC_FLOW_CTRL_DZQP	0x00000080	/* Disable Zero-Quanta Phase */
+#define XGMAC_FLOW_CTRL_PLT	0x00000020	/* Pause Low Threshhold */
+#define XGMAC_FLOW_CTRL_PLT_MASK 0x00000030	/* PLT MASK */
+#define XGMAC_FLOW_CTRL_UP	0x00000008	/* Unicast Pause Frame Detect */
+#define XGMAC_FLOW_CTRL_RFE	0x00000004	/* Rx Flow Control Enable */
+#define XGMAC_FLOW_CTRL_TFE	0x00000002	/* Tx Flow Control Enable */
+#define XGMAC_FLOW_CTRL_FCB_BPA	0x00000001	/* Flow Control Busy ... */
+
+/* XGMAC_INT_STAT reg */
+#define XGMAC_INT_STAT_PMT	0x0080		/* PMT Interrupt Status */
+#define XGMAC_INT_STAT_LPI	0x0040		/* LPI Interrupt Status */
+
+/* DMA Bus Mode register defines */
+#define DMA_BUS_MODE_SFT_RESET	0x00000001	/* Software Reset */
+#define DMA_BUS_MODE_DSL_MASK	0x0000007c	/* Descriptor Skip Length */
+#define DMA_BUS_MODE_DSL_SHIFT	2		/* (in DWORDS) */
+#define DMA_BUS_MODE_ATDS	0x00000080	/* Alternate Descriptor Size */
+
+/* Programmable burst length */
+#define DMA_BUS_MODE_PBL_MASK	0x00003f00	/* Programmable Burst Len */
+#define DMA_BUS_MODE_PBL_SHIFT	8
+#define DMA_BUS_MODE_FB		0x00010000	/* Fixed burst */
+#define DMA_BUS_MODE_RPBL_MASK	0x003e0000	/* Rx-Programmable Burst Len */
+#define DMA_BUS_MODE_RPBL_SHIFT	17
+#define DMA_BUS_MODE_USP	0x00800000
+#define DMA_BUS_MODE_8PBL	0x01000000
+#define DMA_BUS_MODE_AAL	0x02000000
+
+/* DMA Bus Mode register defines */
+#define DMA_BUS_PR_RATIO_MASK	0x0000c000	/* Rx/Tx priority ratio */
+#define DMA_BUS_PR_RATIO_SHIFT	14
+#define DMA_BUS_FB		0x00010000	/* Fixed Burst */
+
+/* DMA Control register defines */
+#define DMA_CONTROL_ST		0x00002000	/* Start/Stop Transmission */
+#define DMA_CONTROL_SR		0x00000002	/* Start/Stop Receive */
+#define DMA_CONTROL_DFF		0x01000000	/* Disable flush of rx frames */
+
+/* DMA Normal interrupt */
+#define DMA_INTR_ENA_NIE	0x00010000	/* Normal Summary */
+#define DMA_INTR_ENA_AIE	0x00008000	/* Abnormal Summary */
+#define DMA_INTR_ENA_ERE	0x00004000	/* Early Receive */
+#define DMA_INTR_ENA_FBE	0x00002000	/* Fatal Bus Error */
+#define DMA_INTR_ENA_ETE	0x00000400	/* Early Transmit */
+#define DMA_INTR_ENA_RWE	0x00000200	/* Receive Watchdog */
+#define DMA_INTR_ENA_RSE	0x00000100	/* Receive Stopped */
+#define DMA_INTR_ENA_RUE	0x00000080	/* Receive Buffer Unavailable */
+#define DMA_INTR_ENA_RIE	0x00000040	/* Receive Interrupt */
+#define DMA_INTR_ENA_UNE	0x00000020	/* Tx Underflow */
+#define DMA_INTR_ENA_OVE	0x00000010	/* Receive Overflow */
+#define DMA_INTR_ENA_TJE	0x00000008	/* Transmit Jabber */
+#define DMA_INTR_ENA_TUE	0x00000004	/* Transmit Buffer Unavail */
+#define DMA_INTR_ENA_TSE	0x00000002	/* Transmit Stopped */
+#define DMA_INTR_ENA_TIE	0x00000001	/* Transmit Interrupt */
+
+#define DMA_INTR_NORMAL		(DMA_INTR_ENA_NIE | DMA_INTR_ENA_RIE | \
+				 DMA_INTR_ENA_TUE)
+
+#define DMA_INTR_ABNORMAL	(DMA_INTR_ENA_AIE | DMA_INTR_ENA_FBE | \
+				 DMA_INTR_ENA_RWE | DMA_INTR_ENA_RSE | \
+				 DMA_INTR_ENA_RUE | DMA_INTR_ENA_UNE | \
+				 DMA_INTR_ENA_OVE | DMA_INTR_ENA_TJE | \
+				 DMA_INTR_ENA_TSE)
+
+/* DMA default interrupt mask */
+#define DMA_INTR_DEFAULT_MASK	(DMA_INTR_NORMAL | DMA_INTR_ABNORMAL)
+
+/* DMA Status register defines */
+#define DMA_STATUS_GMI		0x08000000	/* MMC interrupt */
+#define DMA_STATUS_GLI		0x04000000	/* GMAC Line interface int */
+#define DMA_STATUS_EB_MASK	0x00380000	/* Error Bits Mask */
+#define DMA_STATUS_EB_TX_ABORT	0x00080000	/* Error Bits - TX Abort */
+#define DMA_STATUS_EB_RX_ABORT	0x00100000	/* Error Bits - RX Abort */
+#define DMA_STATUS_TS_MASK	0x00700000	/* Transmit Process State */
+#define DMA_STATUS_TS_SHIFT	20
+#define DMA_STATUS_RS_MASK	0x000e0000	/* Receive Process State */
+#define DMA_STATUS_RS_SHIFT	17
+#define DMA_STATUS_NIS		0x00010000	/* Normal Interrupt Summary */
+#define DMA_STATUS_AIS		0x00008000	/* Abnormal Interrupt Summary */
+#define DMA_STATUS_ERI		0x00004000	/* Early Receive Interrupt */
+#define DMA_STATUS_FBI		0x00002000	/* Fatal Bus Error Interrupt */
+#define DMA_STATUS_ETI		0x00000400	/* Early Transmit Interrupt */
+#define DMA_STATUS_RWT		0x00000200	/* Receive Watchdog Timeout */
+#define DMA_STATUS_RPS		0x00000100	/* Receive Process Stopped */
+#define DMA_STATUS_RU		0x00000080	/* Receive Buffer Unavailable */
+#define DMA_STATUS_RI		0x00000040	/* Receive Interrupt */
+#define DMA_STATUS_UNF		0x00000020	/* Transmit Underflow */
+#define DMA_STATUS_OVF		0x00000010	/* Receive Overflow */
+#define DMA_STATUS_TJT		0x00000008	/* Transmit Jabber Timeout */
+#define DMA_STATUS_TU		0x00000004	/* Transmit Buffer Unavail */
+#define DMA_STATUS_TPS		0x00000002	/* Transmit Process Stopped */
+#define DMA_STATUS_TI		0x00000001	/* Transmit Interrupt */
+
+/* Common MAC defines */
+#define MAC_ENABLE_TX		0x00000008	/* Transmitter Enable */
+#define MAC_ENABLE_RX		0x00000004	/* Receiver Enable */
+
+/* XGMAC Operation Mode Register */
+#define XGMAC_OMR_TSF		0x00200000	/* TX FIFO Store and Forward */
+#define XGMAC_OMR_FTF		0x00100000	/* Flush Transmit FIFO */
+#define XGMAC_OMR_TTC		0x00020000	/* Transmit Threshhold Ctrl */
+#define XGMAC_OMR_TTC_MASK	0x00030000
+#define XGMAC_OMR_RFD		0x00006000	/* FC Deactivation Threshhold */
+#define XGMAC_OMR_RFD_MASK	0x00007000	/* FC Deact Threshhold MASK */
+#define XGMAC_OMR_RFA		0x00000600	/* FC Activation Threshhold */
+#define XGMAC_OMR_RFA_MASK	0x00000E00	/* FC Act Threshhold MASK */
+#define XGMAC_OMR_EFC		0x00000100	/* Enable Hardware FC */
+#define XGMAC_OMR_FEF		0x00000080	/* Forward Error Frames */
+#define XGMAC_OMR_DT		0x00000040	/* Drop TCP/IP csum Errors */
+#define XGMAC_OMR_RSF		0x00000020	/* RX FIFO Store and Forward */
+#define XGMAC_OMR_RTC		0x00000010	/* RX Threshhold Ctrl */
+#define XGMAC_OMR_RTC_MASK	0x00000018	/* RX Threshhold Ctrl MASK */
+
+/* XGMAC HW Features Register */
+#define DMA_HW_FEAT_TXCOESEL	0x00010000	/* TX Checksum offload */
+
+/* XGMAC Descriptor Defines */
+#define MAX_DESC_BUF_SZ		(SZ_8K - 8)
+
+#define RXDESC_EXT_STATUS	0x00000001
+#define RXDESC_CRC_ERR		0x00000002
+#define RXDESC_RX_ERR		0x00000008
+#define RXDESC_RX_WDOG		0x00000010
+#define RXDESC_FRAME_TYPE	0x00000020
+#define RXDESC_GIANT_FRAME	0x00000080
+#define RXDESC_LAST_SEG		0x00000100
+#define RXDESC_FIRST_SEG	0x00000200
+#define RXDESC_VLAN_FRAME	0x00000400
+#define RXDESC_OVERFLOW_ERR	0x00000800
+#define RXDESC_LENGTH_ERR	0x00001000
+#define RXDESC_SA_FILTER_FAIL	0x00002000
+#define RXDESC_DESCRIPTOR_ERR	0x00004000
+#define RXDESC_ERROR_SUMMARY	0x00008000
+#define RXDESC_FRAME_LEN_OFFSET	16
+#define RXDESC_FRAME_LEN_MASK	0x3fff0000
+#define RXDESC_DA_FILTER_FAIL	0x40000000
+
+#define RXDESC1_END_RING	0x00008000
+
+#define RXDESC_IP_PAYLOAD_MASK	0x00000003
+#define RXDESC_IP_PAYLOAD_UDP	0x00000001
+#define RXDESC_IP_PAYLOAD_TCP	0x00000002
+#define RXDESC_IP_PAYLOAD_ICMP	0x00000003
+#define RXDESC_IP_HEADER_ERR	0x00000008
+#define RXDESC_IP_PAYLOAD_ERR	0x00000010
+#define RXDESC_IPV4_PACKET	0x00000040
+#define RXDESC_IPV6_PACKET	0x00000080
+#define TXDESC_UNDERFLOW_ERR	0x00000001
+#define TXDESC_JABBER_TIMEOUT	0x00000002
+#define TXDESC_LOCAL_FAULT	0x00000004
+#define TXDESC_REMOTE_FAULT	0x00000008
+#define TXDESC_VLAN_FRAME	0x00000010
+#define TXDESC_FRAME_FLUSHED	0x00000020
+#define TXDESC_IP_HEADER_ERR	0x00000040
+#define TXDESC_PAYLOAD_CSUM_ERR	0x00000080
+#define TXDESC_ERROR_SUMMARY	0x00008000
+#define TXDESC_SA_CTRL_INSERT	0x00040000
+#define TXDESC_SA_CTRL_REPLACE	0x00080000
+#define TXDESC_2ND_ADDR_CHAINED	0x00100000
+#define TXDESC_END_RING		0x00200000
+#define TXDESC_CSUM_IP		0x00400000
+#define TXDESC_CSUM_IP_PAYLD	0x00800000
+#define TXDESC_CSUM_ALL		0x00C00000
+#define TXDESC_CRC_EN_REPLACE	0x01000000
+#define TXDESC_CRC_EN_APPEND	0x02000000
+#define TXDESC_DISABLE_PAD	0x04000000
+#define TXDESC_FIRST_SEG	0x10000000
+#define TXDESC_LAST_SEG		0x20000000
+#define TXDESC_INTERRUPT	0x40000000
+
+#define DESC_OWN		0x80000000
+#define DESC_BUFFER1_SZ_MASK	0x00001fff
+#define DESC_BUFFER2_SZ_MASK	0x1fff0000
+#define DESC_BUFFER2_SZ_OFFSET	16
+
+struct xgmac_dma_desc {
+	__le32 flags;
+	__le32 buf_size;
+	__le32 buf1_addr;		/* Buffer 1 Address Pointer */
+	__le32 buf2_addr;		/* Buffer 2 Address Pointer */
+	__le32 ext_status;
+	__le32 res[3];
+};
+
+struct xgmac_extra_stats {
+	/* Transmit errors */
+	unsigned long tx_jabber;
+	unsigned long tx_frame_flushed;
+	unsigned long tx_payload_error;
+	unsigned long tx_ip_header_error;
+	unsigned long tx_local_fault;
+	unsigned long tx_remote_fault;
+	/* Receive errors */
+	unsigned long rx_watchdog;
+	unsigned long da_rx_filter_fail;
+	unsigned long sa_rx_filter_fail;
+	unsigned long rx_missed_cntr;
+	unsigned long rx_overflow_cntr;
+	unsigned long rx_payload_error;
+	unsigned long rx_ip_header_error;
+	/* Tx/Rx IRQ errors */
+	unsigned long tx_undeflow_irq;
+	unsigned long tx_process_stopped_irq;
+	unsigned long tx_jabber_irq;
+	unsigned long rx_overflow_irq;
+	unsigned long rx_buf_unav_irq;
+	unsigned long rx_process_stopped_irq;
+	unsigned long rx_watchdog_irq;
+	unsigned long tx_early_irq;
+	unsigned long fatal_bus_error_irq;
+};
+
+struct xgmac_priv {
+	struct xgmac_dma_desc *dma_rx;
+	struct sk_buff **rx_skbuff;
+	unsigned int rx_tail;
+	unsigned int rx_head;
+
+	struct xgmac_dma_desc *dma_tx;
+	struct sk_buff **tx_skbuff;
+	unsigned int tx_head;
+	unsigned int tx_tail;
+
+	void __iomem *base;
+	struct sk_buff_head rx_recycle;
+	unsigned int dma_buf_sz;
+	dma_addr_t dma_rx_phy;
+	dma_addr_t dma_tx_phy;
+
+	struct net_device *dev;
+	struct device *device;
+	struct napi_struct napi;
+
+	struct xgmac_extra_stats xstats;
+
+	int pmt_irq;
+	char rx_pause;
+	char tx_pause;
+	int wolopts;
+};
+
+/* XGMAC Configuration Settings */
+#define MAX_MTU			9000
+#define PAUSE_TIME		0x400
+
+#define DMA_RX_RING_SZ		256
+#define DMA_TX_RING_SZ		128
+/* minimum number of free TX descriptors required to wake up TX process */
+#define TX_THRESH		(DMA_TX_RING_SZ/4)
+
+/* DMA descriptor ring helpers */
+#define dma_ring_incr(n, s)	(((n) + 1) & ((s) - 1))
+#define dma_ring_space(h, t, s)	CIRC_SPACE(h, t, s)
+#define dma_ring_cnt(h, t, s)	CIRC_CNT(h, t, s)
+
+/* XGMAC Descriptor Access Helpers */
+static inline void desc_set_buf_len(struct xgmac_dma_desc *p, u32 buf_sz)
+{
+	if (buf_sz > MAX_DESC_BUF_SZ)
+		p->buf_size = cpu_to_le32(MAX_DESC_BUF_SZ |
+			(buf_sz - MAX_DESC_BUF_SZ) << DESC_BUFFER2_SZ_OFFSET);
+	else
+		p->buf_size = cpu_to_le32(buf_sz);
+}
+
+static inline int desc_get_buf_len(struct xgmac_dma_desc *p)
+{
+	u32 len = cpu_to_le32(p->flags);
+	return (len & DESC_BUFFER1_SZ_MASK) +
+		((len & DESC_BUFFER2_SZ_MASK) >> DESC_BUFFER2_SZ_OFFSET);
+}
+
+static inline void desc_init_rx_desc(struct xgmac_dma_desc *p, int ring_size,
+				     int buf_sz)
+{
+	struct xgmac_dma_desc *end = p + ring_size - 1;
+
+	memset(p, 0, sizeof(*p) * ring_size);
+
+	for (; p <= end; p++)
+		desc_set_buf_len(p, buf_sz);
+
+	end->buf_size |= cpu_to_le32(RXDESC1_END_RING);
+}
+
+static inline void desc_init_tx_desc(struct xgmac_dma_desc *p, u32 ring_size)
+{
+	memset(p, 0, sizeof(*p) * ring_size);
+	p[ring_size - 1].flags = cpu_to_le32(TXDESC_END_RING);
+}
+
+static inline int desc_get_owner(struct xgmac_dma_desc *p)
+{
+	return le32_to_cpu(p->flags) & DESC_OWN;
+}
+
+static inline void desc_set_rx_owner(struct xgmac_dma_desc *p)
+{
+	/* Clear all fields and set the owner */
+	p->flags = cpu_to_le32(DESC_OWN);
+}
+
+static inline void desc_set_tx_owner(struct xgmac_dma_desc *p, u32 flags)
+{
+	u32 tmpflags = le32_to_cpu(p->flags);
+	tmpflags &= TXDESC_END_RING;
+	tmpflags |= flags | DESC_OWN;
+	p->flags = cpu_to_le32(tmpflags);
+}
+
+static inline int desc_get_tx_ls(struct xgmac_dma_desc *p)
+{
+	return le32_to_cpu(p->flags) & TXDESC_LAST_SEG;
+}
+
+static inline u32 desc_get_buf_addr(struct xgmac_dma_desc *p)
+{
+	return le32_to_cpu(p->buf1_addr);
+}
+
+static inline void desc_set_buf_addr(struct xgmac_dma_desc *p,
+				     u32 paddr, int len)
+{
+	p->buf1_addr = cpu_to_le32(paddr);
+	if (len > MAX_DESC_BUF_SZ)
+		p->buf2_addr = cpu_to_le32(paddr + MAX_DESC_BUF_SZ);
+}
+
+static inline void desc_set_buf_addr_and_size(struct xgmac_dma_desc *p,
+					      u32 paddr, int len)
+{
+	desc_set_buf_len(p, len);
+	desc_set_buf_addr(p, paddr, len);
+}
+
+static inline int desc_get_rx_frame_len(struct xgmac_dma_desc *p)
+{
+	u32 data = le32_to_cpu(p->flags);
+	u32 len = (data & RXDESC_FRAME_LEN_MASK) >> RXDESC_FRAME_LEN_OFFSET;
+	if (data & RXDESC_FRAME_TYPE)
+		len -= ETH_FCS_LEN;
+
+	return len;
+}
+
+static void xgmac_dma_flush_tx_fifo(void __iomem *ioaddr)
+{
+	int timeout = 1000;
+	u32 reg = readl(ioaddr + XGMAC_OMR);
+	writel(reg | XGMAC_OMR_FTF, ioaddr + XGMAC_OMR);
+
+	while ((timeout-- > 0) && readl(ioaddr + XGMAC_OMR) & XGMAC_OMR_FTF)
+		udelay(1);
+}
+
+static int desc_get_tx_status(struct xgmac_priv *priv, struct xgmac_dma_desc *p)
+{
+	struct xgmac_extra_stats *x = &priv->xstats;
+	u32 status = le32_to_cpu(p->flags);
+
+	if (!(status & TXDESC_ERROR_SUMMARY))
+		return 0;
+
+	netdev_dbg(priv->dev, "tx desc error = 0x%08x\n", status);
+	if (status & TXDESC_JABBER_TIMEOUT)
+		x->tx_jabber++;
+	if (status & TXDESC_FRAME_FLUSHED)
+		x->tx_frame_flushed++;
+	if (status & TXDESC_UNDERFLOW_ERR)
+		xgmac_dma_flush_tx_fifo(priv->base);
+	if (status & TXDESC_IP_HEADER_ERR)
+		x->tx_ip_header_error++;
+	if (status & TXDESC_LOCAL_FAULT)
+		x->tx_local_fault++;
+	if (status & TXDESC_REMOTE_FAULT)
+		x->tx_remote_fault++;
+	if (status & TXDESC_PAYLOAD_CSUM_ERR)
+		x->tx_payload_error++;
+
+	return -1;
+}
+
+static int desc_get_rx_status(struct xgmac_priv *priv, struct xgmac_dma_desc *p)
+{
+	struct xgmac_extra_stats *x = &priv->xstats;
+	int ret = CHECKSUM_UNNECESSARY;
+	u32 status = le32_to_cpu(p->flags);
+	u32 ext_status = le32_to_cpu(p->ext_status);
+
+	if (status & RXDESC_DA_FILTER_FAIL) {
+		netdev_dbg(priv->dev, "XGMAC RX : Dest Address filter fail\n");
+		x->da_rx_filter_fail++;
+		return -1;
+	}
+
+	/* Check if packet has checksum already */
+	if ((status & RXDESC_FRAME_TYPE) && (status & RXDESC_EXT_STATUS) &&
+		!(ext_status & RXDESC_IP_PAYLOAD_MASK))
+		ret = CHECKSUM_NONE;
+
+	netdev_dbg(priv->dev, "rx status - frame type=%d, csum = %d, ext stat %08x\n",
+		   (status & RXDESC_FRAME_TYPE) ? 1 : 0, ret, ext_status);
+
+	if (!(status & RXDESC_ERROR_SUMMARY))
+		return ret;
+
+	/* Handle any errors */
+	if (status & (RXDESC_DESCRIPTOR_ERR | RXDESC_OVERFLOW_ERR |
+		RXDESC_GIANT_FRAME | RXDESC_LENGTH_ERR | RXDESC_CRC_ERR))
+		return -1;
+
+	if (status & RXDESC_EXT_STATUS) {
+		if (ext_status & RXDESC_IP_HEADER_ERR)
+			x->rx_ip_header_error++;
+		if (ext_status & RXDESC_IP_PAYLOAD_ERR)
+			x->rx_payload_error++;
+		netdev_dbg(priv->dev, "IP checksum error - stat %08x\n",
+			   ext_status);
+		return -1;
+	}
+
+	return ret;
+}
+
+static inline void xgmac_mac_enable(void __iomem *ioaddr)
+{
+	u32 value = readl(ioaddr + XGMAC_CONTROL);
+	value |= MAC_ENABLE_RX | MAC_ENABLE_TX;
+	writel(value, ioaddr + XGMAC_CONTROL);
+
+	value = readl(ioaddr + XGMAC_DMA_CONTROL);
+	value |= DMA_CONTROL_ST | DMA_CONTROL_SR;
+	writel(value, ioaddr + XGMAC_DMA_CONTROL);
+}
+
+static inline void xgmac_mac_disable(void __iomem *ioaddr)
+{
+	u32 value = readl(ioaddr + XGMAC_DMA_CONTROL);
+	value &= ~(DMA_CONTROL_ST | DMA_CONTROL_SR);
+	writel(value, ioaddr + XGMAC_DMA_CONTROL);
+
+	value = readl(ioaddr + XGMAC_CONTROL);
+	value &= ~(MAC_ENABLE_TX | MAC_ENABLE_RX);
+	writel(value, ioaddr + XGMAC_CONTROL);
+}
+
+static void xgmac_set_mac_addr(void __iomem *ioaddr, unsigned char *addr,
+			       int num)
+{
+	u32 data;
+
+	data = (addr[5] << 8) | addr[4] | (num ? XGMAC_ADDR_AE : 0);
+	writel(data, ioaddr + XGMAC_ADDR_HIGH(num));
+	data = (addr[3] << 24) | (addr[2] << 16) | (addr[1] << 8) | addr[0];
+	writel(data, ioaddr + XGMAC_ADDR_LOW(num));
+}
+
+static void xgmac_get_mac_addr(void __iomem *ioaddr, unsigned char *addr,
+			       int num)
+{
+	u32 hi_addr, lo_addr;
+
+	/* Read the MAC address from the hardware */
+	hi_addr = readl(ioaddr + XGMAC_ADDR_HIGH(num));
+	lo_addr = readl(ioaddr + XGMAC_ADDR_LOW(num));
+
+	/* Extract the MAC address from the high and low words */
+	addr[0] = lo_addr & 0xff;
+	addr[1] = (lo_addr >> 8) & 0xff;
+	addr[2] = (lo_addr >> 16) & 0xff;
+	addr[3] = (lo_addr >> 24) & 0xff;
+	addr[4] = hi_addr & 0xff;
+	addr[5] = (hi_addr >> 8) & 0xff;
+}
+
+static int xgmac_set_flow_ctrl(struct xgmac_priv *priv, int rx, int tx)
+{
+	u32 reg;
+	unsigned int flow = 0;
+
+	priv->rx_pause = rx;
+	priv->tx_pause = tx;
+
+	if (rx || tx) {
+		if (rx)
+			flow |= XGMAC_FLOW_CTRL_RFE;
+		if (tx)
+			flow |= XGMAC_FLOW_CTRL_TFE;
+
+		flow |= XGMAC_FLOW_CTRL_PLT | XGMAC_FLOW_CTRL_UP;
+		flow |= (PAUSE_TIME << XGMAC_FLOW_CTRL_PT_SHIFT);
+
+		writel(flow, priv->base + XGMAC_FLOW_CTRL);
+
+		reg = readl(priv->base + XGMAC_OMR);
+		reg |= XGMAC_OMR_EFC;
+		writel(reg, priv->base + XGMAC_OMR);
+	} else {
+		writel(0, priv->base + XGMAC_FLOW_CTRL);
+
+		reg = readl(priv->base + XGMAC_OMR);
+		reg &= ~XGMAC_OMR_EFC;
+		writel(reg, priv->base + XGMAC_OMR);
+	}
+
+	return 0;
+}
+
+static void xgmac_rx_refill(struct xgmac_priv *priv)
+{
+	struct xgmac_dma_desc *p;
+	dma_addr_t paddr;
+
+	while (dma_ring_space(priv->rx_head, priv->rx_tail, DMA_RX_RING_SZ) > 1) {
+		int entry = priv->rx_head;
+		struct sk_buff *skb;
+
+		p = priv->dma_rx + entry;
+
+		if (priv->rx_skbuff[entry] != NULL)
+			continue;
+
+		skb = __skb_dequeue(&priv->rx_recycle);
+		if (skb == NULL)
+			skb = netdev_alloc_skb(priv->dev, priv->dma_buf_sz);
+		if (unlikely(skb == NULL))
+			break;
+
+		priv->rx_skbuff[entry] = skb;
+		paddr = dma_map_single(priv->device, skb->data,
+					 priv->dma_buf_sz, DMA_FROM_DEVICE);
+		desc_set_buf_addr(p, paddr, priv->dma_buf_sz);
+
+		netdev_dbg(priv->dev, "rx ring: head %d, tail %d\n",
+			priv->rx_head, priv->rx_tail);
+
+		priv->rx_head = dma_ring_incr(priv->rx_head, DMA_RX_RING_SZ);
+		/* Ensure descriptor is in memory before handing to h/w */
+		wmb();
+		desc_set_rx_owner(p);
+	}
+}
+
+/**
+ * init_xgmac_dma_desc_rings - init the RX/TX descriptor rings
+ * @dev: net device structure
+ * Description:  this function initializes the DMA RX/TX descriptors
+ * and allocates the socket buffers.
+ */
+static int xgmac_dma_desc_rings_init(struct net_device *dev)
+{
+	struct xgmac_priv *priv = netdev_priv(dev);
+	unsigned int bfsize;
+
+	/* Set the Buffer size according to the MTU;
+	 * indeed, in case of jumbo we need to bump-up the buffer sizes.
+	 */
+	bfsize = ALIGN(dev->mtu + ETH_HLEN + ETH_FCS_LEN + NET_IP_ALIGN + 64,
+		       64);
+
+	netdev_dbg(priv->dev, "mtu [%d] bfsize [%d]\n", dev->mtu, bfsize);
+
+	priv->rx_skbuff = kzalloc(sizeof(struct sk_buff *) * DMA_RX_RING_SZ,
+				  GFP_KERNEL);
+	if (!priv->rx_skbuff)
+		return -ENOMEM;
+
+	priv->dma_rx = dma_alloc_coherent(priv->device,
+					  DMA_RX_RING_SZ *
+					  sizeof(struct xgmac_dma_desc),
+					  &priv->dma_rx_phy,
+					  GFP_KERNEL);
+	if (!priv->dma_rx)
+		goto err_dma_rx;
+
+	priv->tx_skbuff = kzalloc(sizeof(struct sk_buff *) * DMA_TX_RING_SZ,
+				  GFP_KERNEL);
+	if (!priv->tx_skbuff)
+		goto err_tx_skb;
+
+	priv->dma_tx = dma_alloc_coherent(priv->device,
+					  DMA_TX_RING_SZ *
+					  sizeof(struct xgmac_dma_desc),
+					  &priv->dma_tx_phy,
+					  GFP_KERNEL);
+	if (!priv->dma_tx)
+		goto err_dma_tx;
+
+	netdev_dbg(priv->dev, "DMA desc rings: virt addr (Rx %p, "
+	    "Tx %p)\n\tDMA phy addr (Rx 0x%08x, Tx 0x%08x)\n",
+	    priv->dma_rx, priv->dma_tx,
+	    (unsigned int)priv->dma_rx_phy, (unsigned int)priv->dma_tx_phy);
+
+	priv->rx_tail = 0;
+	priv->rx_head = 0;
+	priv->dma_buf_sz = bfsize;
+	desc_init_rx_desc(priv->dma_rx, DMA_RX_RING_SZ, priv->dma_buf_sz);
+	xgmac_rx_refill(priv);
+
+	priv->tx_tail = 0;
+	priv->tx_head = 0;
+	desc_init_tx_desc(priv->dma_tx, DMA_TX_RING_SZ);
+
+	/* The base address of the RX/TX descriptor lists must be written into
+	 * DMA CSR3 and CSR4, respectively. */
+	writel(priv->dma_tx_phy, priv->base + XGMAC_DMA_TX_BASE_ADDR);
+	writel(priv->dma_rx_phy, priv->base + XGMAC_DMA_RX_BASE_ADDR);
+
+	return 0;
+
+err_dma_tx:
+	kfree(priv->tx_skbuff);
+err_tx_skb:
+	dma_free_coherent(priv->device,
+			  DMA_RX_RING_SZ * sizeof(struct xgmac_dma_desc),
+			  priv->dma_rx, priv->dma_rx_phy);
+err_dma_rx:
+	kfree(priv->rx_skbuff);
+	return -ENOMEM;
+}
+
+static void xgmac_free_rx_skbufs(struct xgmac_priv *priv)
+{
+	int i;
+	struct xgmac_dma_desc *p;
+
+	for (i = 0; i < DMA_RX_RING_SZ; i++) {
+		if (priv->rx_skbuff[i] == NULL)
+			continue;
+
+		p = priv->dma_rx + i;
+		dma_unmap_single(priv->device, desc_get_buf_addr(p),
+				 priv->dma_buf_sz, DMA_FROM_DEVICE);
+		dev_kfree_skb_any(priv->rx_skbuff[i]);
+		priv->rx_skbuff[i] = NULL;
+	}
+}
+
+static void xgmac_free_tx_skbufs(struct xgmac_priv *priv)
+{
+	int i, f;
+	struct xgmac_dma_desc *p;
+
+	for (i = 0; i < DMA_TX_RING_SZ; i++) {
+		if (priv->tx_skbuff[i] == NULL)
+			continue;
+
+		p = priv->dma_tx + i;
+		dma_unmap_single(priv->device, desc_get_buf_addr(p),
+				 desc_get_buf_len(p), DMA_TO_DEVICE);
+
+		for (f = 0; f < skb_shinfo(priv->tx_skbuff[i])->nr_frags; f++) {
+			p = priv->dma_tx + i++;
+			dma_unmap_page(priv->device, desc_get_buf_addr(p),
+				       desc_get_buf_len(p), DMA_TO_DEVICE);
+		}
+
+		dev_kfree_skb_any(priv->tx_skbuff[i]);
+		priv->tx_skbuff[i] = NULL;
+	}
+}
+
+static void xgmac_free_dma_desc_rings(struct xgmac_priv *priv)
+{
+	/* Release the DMA TX/RX socket buffers */
+	xgmac_free_rx_skbufs(priv);
+	xgmac_free_tx_skbufs(priv);
+
+	/* Free the consistent memory allocated for descriptor rings */
+	dma_free_coherent(priv->device,
+			  DMA_TX_RING_SZ * sizeof(struct xgmac_dma_desc),
+			  priv->dma_tx, priv->dma_tx_phy);
+	priv->dma_tx = NULL;
+	dma_free_coherent(priv->device,
+			  DMA_RX_RING_SZ * sizeof(struct xgmac_dma_desc),
+			  priv->dma_rx, priv->dma_rx_phy);
+	priv->dma_rx = NULL;
+
+	kfree(priv->rx_skbuff);
+	priv->rx_skbuff = NULL;
+	kfree(priv->tx_skbuff);
+	priv->tx_skbuff = NULL;
+}
+
+/**
+ * xgmac_tx:
+ * @priv: private driver structure
+ * Description: it reclaims resources after transmission completes.
+ */
+static void xgmac_tx_complete(struct xgmac_priv *priv)
+{
+	int i;
+	void __iomem *ioaddr = priv->base;
+
+	writel(DMA_STATUS_TU | DMA_STATUS_NIS, ioaddr + XGMAC_DMA_STATUS);
+
+	while (dma_ring_cnt(priv->tx_head, priv->tx_tail, DMA_TX_RING_SZ)) {
+		unsigned int entry = priv->tx_tail;
+		struct sk_buff *skb = priv->tx_skbuff[entry];
+		struct xgmac_dma_desc *p = priv->dma_tx + entry;
+
+		/* Check if the descriptor is owned by the DMA. */
+		if (desc_get_owner(p))
+			break;
+
+		/* Verify tx error by looking at the last segment */
+		if (desc_get_tx_ls(p))
+			desc_get_tx_status(priv, p);
+
+		netdev_dbg(priv->dev, "tx ring: curr %d, dirty %d\n",
+			priv->tx_head, priv->tx_tail);
+
+		dma_unmap_single(priv->device, desc_get_buf_addr(p),
+				 desc_get_buf_len(p), DMA_TO_DEVICE);
+
+		priv->tx_skbuff[entry] = NULL;
+		priv->tx_tail = dma_ring_incr(entry, DMA_TX_RING_SZ);
+
+		if (!skb) {
+			continue;
+		}
+
+		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+			entry = priv->tx_tail = dma_ring_incr(priv->tx_tail,
+							      DMA_TX_RING_SZ);
+			p = priv->dma_tx + priv->tx_tail;
+
+			dma_unmap_page(priv->device, desc_get_buf_addr(p),
+				       desc_get_buf_len(p), DMA_TO_DEVICE);
+		}
+
+		/*
+		 * If there's room in the queue (limit it to size)
+		 * we add this skb back into the pool,
+		 * if it's the right size.
+		 */
+		if ((skb_queue_len(&priv->rx_recycle) <
+			DMA_RX_RING_SZ) &&
+			skb_recycle_check(skb, priv->dma_buf_sz))
+			__skb_queue_head(&priv->rx_recycle, skb);
+		else
+			dev_kfree_skb(skb);
+	}
+
+	if (dma_ring_space(priv->tx_head, priv->tx_tail, DMA_TX_RING_SZ) >
+	    TX_THRESH)
+		netif_wake_queue(priv->dev);
+}
+
+/**
+ * xgmac_tx_err:
+ * @priv: pointer to the private device structure
+ * Description: it cleans the descriptors and restarts the transmission
+ * in case of errors.
+ */
+static void xgmac_tx_err(struct xgmac_priv *priv)
+{
+	u32 reg, value, inten;
+
+	netif_stop_queue(priv->dev);
+
+	inten = readl(priv->base + XGMAC_DMA_INTR_ENA);
+	writel(0, priv->base + XGMAC_DMA_INTR_ENA);
+
+	reg = readl(priv->base + XGMAC_DMA_CONTROL);
+	writel(reg & ~DMA_CONTROL_ST, priv->base + XGMAC_DMA_CONTROL);
+	do {
+		value = readl(priv->base + XGMAC_DMA_STATUS) & 0x700000;
+	} while (value && (value != 0x600000));
+
+	xgmac_free_tx_skbufs(priv);
+	desc_init_tx_desc(priv->dma_tx, DMA_TX_RING_SZ);
+	priv->tx_tail = 0;
+	priv->tx_head = 0;
+	writel(reg | DMA_CONTROL_ST, priv->base + XGMAC_DMA_CONTROL);
+
+	writel(DMA_STATUS_TU | DMA_STATUS_TPS | DMA_STATUS_NIS | DMA_STATUS_AIS,
+		priv->base + XGMAC_DMA_STATUS);
+	writel(inten, priv->base + XGMAC_DMA_INTR_ENA);
+
+	netif_wake_queue(priv->dev);
+}
+
+static int xgmac_hw_init(struct net_device *dev)
+{
+	u32 value, ctrl;
+	int limit;
+	struct xgmac_priv *priv = netdev_priv(dev);
+	void __iomem *ioaddr = priv->base;
+
+	/* Save the ctrl register value */
+	ctrl = readl(ioaddr + XGMAC_CONTROL) & XGMAC_CONTROL_SPD_MASK;
+
+	/* SW reset */
+	value = DMA_BUS_MODE_SFT_RESET;
+	writel(value, ioaddr + XGMAC_DMA_BUS_MODE);
+	limit = 15000;
+	while (limit-- &&
+		(readl(ioaddr + XGMAC_DMA_BUS_MODE) & DMA_BUS_MODE_SFT_RESET))
+		cpu_relax();
+	if (limit < 0)
+		return -EBUSY;
+
+	value = (0x10 << DMA_BUS_MODE_PBL_SHIFT) |
+		(0x10 << DMA_BUS_MODE_RPBL_SHIFT) |
+		DMA_BUS_MODE_FB | DMA_BUS_MODE_ATDS | DMA_BUS_MODE_AAL;
+	writel(value, ioaddr + XGMAC_DMA_BUS_MODE);
+
+	/* Enable interrupts */
+	writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_STATUS);
+	writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_INTR_ENA);
+
+	/* XGMAC requires AXI bus init. This is a 'magic number' for now */
+	writel(0x000100E, ioaddr + XGMAC_DMA_AXI_BUS);
+
+	ctrl |= XGMAC_CONTROL_DDIC | XGMAC_CONTROL_JE | XGMAC_CONTROL_ACS |
+		XGMAC_CONTROL_CAR;
+	if (dev->features & NETIF_F_RXCSUM)
+		ctrl |= XGMAC_CONTROL_IPC;
+	writel(ctrl, ioaddr + XGMAC_CONTROL);
+
+	value = DMA_CONTROL_DFF;
+	writel(value, ioaddr + XGMAC_DMA_CONTROL);
+
+	/* Set the HW DMA mode and the COE */
+	writel(XGMAC_OMR_TSF | XGMAC_OMR_RSF | XGMAC_OMR_RFD | XGMAC_OMR_RFA,
+		ioaddr + XGMAC_OMR);
+
+	/* Reset the MMC counters */
+	writel(1, ioaddr + XGMAC_MMC_CTRL);
+	return 0;
+}
+
+/**
+ *  xgmac_open - open entry point of the driver
+ *  @dev : pointer to the device structure.
+ *  Description:
+ *  This function is the open entry point of the driver.
+ *  Return value:
+ *  0 on success and an appropriate (-)ve integer as defined in errno.h
+ *  file on failure.
+ */
+static int xgmac_open(struct net_device *dev)
+{
+	int ret;
+	struct xgmac_priv *priv = netdev_priv(dev);
+	void __iomem *ioaddr = priv->base;
+
+	/* Check that the MAC address is valid.  If its not, refuse
+	 * to bring the device up. The user must specify an
+	 * address using the following linux command:
+	 *      ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx  */
+	if (!is_valid_ether_addr(dev->dev_addr)) {
+		random_ether_addr(dev->dev_addr);
+		netdev_dbg(priv->dev, "generated random MAC address %pM\n",
+			dev->dev_addr);
+	}
+
+	skb_queue_head_init(&priv->rx_recycle);
+	memset(&priv->xstats, 0, sizeof(struct xgmac_extra_stats));
+
+	/* Initialize the XGMAC and descriptors */
+	xgmac_hw_init(dev);
+	xgmac_set_mac_addr(ioaddr, dev->dev_addr, 0);
+	xgmac_set_flow_ctrl(priv, priv->rx_pause, priv->tx_pause);
+
+	ret = xgmac_dma_desc_rings_init(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Enable the MAC Rx/Tx */
+	xgmac_mac_enable(ioaddr);
+
+	napi_enable(&priv->napi);
+	netif_start_queue(dev);
+
+	enable_irq(dev->irq);
+
+	return 0;
+}
+
+/**
+ *  xgmac_release - close entry point of the driver
+ *  @dev : device pointer.
+ *  Description:
+ *  This is the stop entry point of the driver.
+ */
+static int xgmac_release(struct net_device *dev)
+{
+	struct xgmac_priv *priv = netdev_priv(dev);
+
+	netif_stop_queue(dev);
+
+	disable_irq(dev->irq);
+	napi_disable(&priv->napi);
+	skb_queue_purge(&priv->rx_recycle);
+
+	/* Disable the MAC core */
+	xgmac_mac_disable(priv->base);
+
+	/* Release and free the Rx/Tx resources */
+	xgmac_free_dma_desc_rings(priv);
+
+	return 0;
+}
+
+/**
+ *  xgmac_xmit:
+ *  @skb : the socket buffer
+ *  @dev : device pointer
+ *  Description : Tx entry point of the driver.
+ */
+static netdev_tx_t xgmac_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct xgmac_priv *priv = netdev_priv(dev);
+	unsigned int entry;
+	int i;
+	int nfrags = skb_shinfo(skb)->nr_frags;
+	struct xgmac_dma_desc *desc, *first;
+	unsigned int desc_flags;
+	unsigned int len;
+	dma_addr_t paddr;
+
+	if (dma_ring_space(priv->tx_head, priv->tx_tail, DMA_TX_RING_SZ) <
+	    (nfrags + 1)) {
+		writel(DMA_INTR_DEFAULT_MASK | DMA_INTR_ENA_TIE,
+			priv->base + XGMAC_DMA_INTR_ENA);
+		netif_stop_queue(dev);
+		return NETDEV_TX_BUSY;
+	}
+
+	desc_flags = (skb->ip_summed == CHECKSUM_PARTIAL) ?
+		TXDESC_CSUM_ALL : 0;
+	entry = priv->tx_head;
+	desc = priv->dma_tx + entry;
+	first = desc;
+
+	priv->tx_skbuff[entry] = skb;
+	len = skb_headlen(skb);
+	paddr = dma_map_single(priv->device, skb->data, len, DMA_TO_DEVICE);
+	desc_set_buf_addr_and_size(desc, paddr, len);
+
+	for (i = 0; i < nfrags; i++) {
+		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+
+		len = frag->size;
+		entry = dma_ring_incr(entry, DMA_TX_RING_SZ);
+		desc = priv->dma_tx + entry;
+
+		paddr = dma_map_page(priv->device, frag->page.p,
+				frag->page_offset, len, DMA_TO_DEVICE);
+		priv->tx_skbuff[entry] = NULL;
+
+		desc_set_buf_addr_and_size(desc, paddr, len);
+		if (i < (nfrags - 1))
+			desc_set_tx_owner(desc, desc_flags);
+	}
+
+	/* Interrupt on completition only for the latest segment */
+	if (desc != first)
+		desc_set_tx_owner(desc, desc_flags |
+			TXDESC_LAST_SEG | TXDESC_INTERRUPT);
+	else
+		desc_flags |= TXDESC_LAST_SEG | TXDESC_INTERRUPT;
+
+	/* Set owner on first desc last to avoid race condition */
+	wmb();
+	desc_set_tx_owner(first, desc_flags | TXDESC_FIRST_SEG);
+
+	priv->tx_head = dma_ring_incr(entry, DMA_TX_RING_SZ);
+
+	writel(1, priv->base + XGMAC_DMA_TX_POLL);
+
+	return NETDEV_TX_OK;
+}
+
+static int xgmac_rx(struct xgmac_priv *priv, int limit)
+{
+	unsigned int entry;
+	unsigned int count = 0;
+	struct xgmac_dma_desc *p;
+
+	while (count < limit) {
+		int ip_checksum;
+		struct sk_buff *skb;
+		int frame_len;
+
+		writel(DMA_STATUS_RI | DMA_STATUS_NIS,
+		       priv->base + XGMAC_DMA_STATUS);
+
+		entry = priv->rx_tail;
+		p = priv->dma_rx + entry;
+		if (desc_get_owner(p))
+			break;
+
+		count++;
+		priv->rx_tail = dma_ring_incr(priv->rx_tail, DMA_RX_RING_SZ);
+
+		/* read the status of the incoming frame */
+		ip_checksum = desc_get_rx_status(priv, p);
+		if (ip_checksum < 0)
+			continue;
+
+		skb = priv->rx_skbuff[entry];
+		if (unlikely(!skb)) {
+			netdev_err(priv->dev, "Inconsistent Rx descriptor chain\n");
+			break;
+		}
+		priv->rx_skbuff[entry] = NULL;
+
+		frame_len = desc_get_rx_frame_len(p);
+		netdev_dbg(priv->dev, "RX frame size %d, COE status: %d\n",
+			frame_len, ip_checksum);
+
+		skb_put(skb, frame_len);
+		dma_unmap_single(priv->device, desc_get_buf_addr(p),
+				 frame_len, DMA_FROM_DEVICE);
+
+		skb->protocol = eth_type_trans(skb, priv->dev);
+		skb->ip_summed = ip_checksum;
+		if (ip_checksum == CHECKSUM_NONE)
+			netif_receive_skb(skb);
+		else
+			napi_gro_receive(&priv->napi, skb);
+	}
+
+	xgmac_rx_refill(priv);
+
+	writel(1, priv->base + XGMAC_DMA_RX_POLL);
+
+	return count;
+}
+
+/**
+ *  xgmac_poll - xgmac poll method (NAPI)
+ *  @napi : pointer to the napi structure.
+ *  @budget : maximum number of packets that the current CPU can receive from
+ *	      all interfaces.
+ *  Description :
+ *   This function implements the the reception process.
+ *   Also it runs the TX completion thread
+ */
+static int xgmac_poll(struct napi_struct *napi, int budget)
+{
+	struct xgmac_priv *priv = container_of(napi,
+				       struct xgmac_priv, napi);
+	int work_done = 0;
+
+	xgmac_tx_complete(priv);
+	work_done = xgmac_rx(priv, budget);
+
+	if (work_done < budget) {
+		napi_complete(napi);
+		writel(DMA_INTR_DEFAULT_MASK, priv->base + XGMAC_DMA_INTR_ENA);
+	}
+	return work_done;
+}
+
+/**
+ *  xgmac_tx_timeout
+ *  @dev : Pointer to net device structure
+ *  Description: this function is called when a packet transmission fails to
+ *   complete within a reasonable tmrate. The driver will mark the error in the
+ *   netdev structure and arrange for the device to be reset to a sane state
+ *   in order to transmit a new packet.
+ */
+static void xgmac_tx_timeout(struct net_device *dev)
+{
+	struct xgmac_priv *priv = netdev_priv(dev);
+
+	/* Clear Tx resources and restart transmitting again */
+	xgmac_tx_err(priv);
+}
+
+/**
+ *  xgmac_set_rx_mode - entry point for multicast addressing
+ *  @dev : pointer to the device structure
+ *  Description:
+ *  This function is a driver entry point which gets called by the kernel
+ *  whenever multicast addresses must be enabled/disabled.
+ *  Return value:
+ *  void.
+ */
+static void xgmac_set_rx_mode(struct net_device *dev)
+{
+	int i;
+	struct xgmac_priv *priv = netdev_priv(dev);
+	void __iomem *ioaddr = priv->base;
+	unsigned int value = 0;
+	u32 mc_filter[XGMAC_NUM_HASH];
+	int reg = 1;
+	struct netdev_hw_addr *ha;
+	bool use_hash = false;
+
+	netdev_dbg(priv->dev, "# mcasts %d, # unicast %d\n",
+		 netdev_mc_count(dev), netdev_uc_count(dev));
+
+	if (dev->flags & IFF_PROMISC) {
+		writel(XGMAC_FRAME_FILTER_PR, ioaddr + XGMAC_FRAME_FILTER);
+		return;
+	}
+
+	memset(mc_filter, 0, sizeof(mc_filter));
+
+	if (netdev_uc_count(dev) > XGMAC_MAX_FILTER_ADDR) {
+		use_hash = true;
+		value |= XGMAC_FRAME_FILTER_HUC | XGMAC_FRAME_FILTER_HPF;
+	}
+	netdev_for_each_uc_addr(ha, dev) {
+		if (use_hash) {
+			u32 bit_nr = ~ether_crc(ETH_ALEN, ha->addr) >> 23;
+
+			/* The most significant 4 bits determine the register to
+			 * use (H/L) while the other 5 bits determine the bit
+			 * within the register. */
+			mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
+		} else {
+			xgmac_set_mac_addr(ioaddr, ha->addr, reg);
+			reg++;
+		}
+	}
+
+	if (dev->flags & IFF_ALLMULTI) {
+		value |= XGMAC_FRAME_FILTER_PM;
+		goto out;
+	}
+
+	if ((netdev_mc_count(dev) + reg - 1) > XGMAC_MAX_FILTER_ADDR) {
+		use_hash = true;
+		value |= XGMAC_FRAME_FILTER_HMC | XGMAC_FRAME_FILTER_HPF;
+	}
+	netdev_for_each_mc_addr(ha, dev) {
+		if (use_hash) {
+			u32 bit_nr = ~ether_crc(ETH_ALEN, ha->addr) >> 23;
+
+			/* The most significant 4 bits determine the register to
+			 * use (H/L) while the other 5 bits determine the bit
+			 * within the register. */
+			mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
+		} else {
+			xgmac_set_mac_addr(ioaddr, ha->addr, reg);
+			reg++;
+		}
+	}
+
+out:
+	for (i = 0; i < XGMAC_NUM_HASH; i++)
+		writel(mc_filter[i], ioaddr + XGMAC_HASH(i));
+
+	writel(value, ioaddr + XGMAC_FRAME_FILTER);
+}
+
+/**
+ *  xgmac_change_mtu - entry point to change MTU size for the device.
+ *  @dev : device pointer.
+ *  @new_mtu : the new MTU size for the device.
+ *  Description: the Maximum Transfer Unit (MTU) is used by the network layer
+ *  to drive packet transmission. Ethernet has an MTU of 1500 octets
+ *  (ETH_DATA_LEN). This value can be changed with ifconfig.
+ *  Return value:
+ *  0 on success and an appropriate (-)ve integer as defined in errno.h
+ *  file on failure.
+ */
+static int xgmac_change_mtu(struct net_device *dev, int new_mtu)
+{
+	struct xgmac_priv *priv = netdev_priv(dev);
+	int old_mtu;
+
+	if ((new_mtu < 46) || (new_mtu > MAX_MTU)) {
+		netdev_err(priv->dev, "invalid MTU, max MTU is: %d\n", MAX_MTU);
+		return -EINVAL;
+	}
+
+	old_mtu = dev->mtu;
+	dev->mtu = new_mtu;
+
+	/* return early if the buffer sizes will not change */
+	if (old_mtu <= ETH_DATA_LEN && new_mtu <= ETH_DATA_LEN)
+		return 0;
+	if (old_mtu == new_mtu)
+		return 0;
+
+	/* Stop everything, get ready to change the MTU */
+	if (!netif_running(dev))
+		return 0;
+
+	/* Bring the interface down and then back up */
+	xgmac_release(dev);
+	xgmac_open(dev);
+
+	return 0;
+}
+
+static irqreturn_t xgmac_pmt_interrupt(int irq, void *dev_id)
+{
+	u32 intr_status;
+	struct net_device *dev = (struct net_device *)dev_id;
+	struct xgmac_priv *priv = netdev_priv(dev);
+	void __iomem *ioaddr = priv->base;
+
+	intr_status = readl(ioaddr + XGMAC_INT_STAT);
+	if (intr_status & XGMAC_INT_STAT_PMT) {
+		netdev_dbg(priv->dev, "received Magic frame\n");
+		/* clear the PMT bits 5 and 6 by reading the PMT */
+		readl(ioaddr + XGMAC_PMT);
+	}
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t xgmac_interrupt(int irq, void *dev_id)
+{
+	u32 intr_status;
+	bool tx_err = false;
+	struct net_device *dev = (struct net_device *)dev_id;
+	struct xgmac_priv *priv = netdev_priv(dev);
+	struct xgmac_extra_stats *x = &priv->xstats;
+
+	/* read the status register (CSR5) */
+	intr_status = readl(priv->base + XGMAC_DMA_STATUS);
+	intr_status &= readl(priv->base + XGMAC_DMA_INTR_ENA);
+	writel(intr_status, priv->base + XGMAC_DMA_STATUS);
+
+	/* It displays the DMA process states (CSR5 register) */
+	/* ABNORMAL interrupts */
+	if (unlikely(intr_status & DMA_STATUS_AIS)) {
+		if (intr_status & DMA_STATUS_UNF) {
+			netdev_err(priv->dev, "transmit underflow\n");
+			tx_err = true;
+			x->tx_undeflow_irq++;
+		}
+		if (intr_status & DMA_STATUS_TJT) {
+			netdev_err(priv->dev, "transmit jabber\n");
+			x->tx_jabber_irq++;
+		}
+		if (intr_status & DMA_STATUS_OVF) {
+			netdev_err(priv->dev, "recv overflow\n");
+			x->rx_overflow_irq++;
+		}
+		if (intr_status & DMA_STATUS_RU)
+			x->rx_buf_unav_irq++;
+		if (intr_status & DMA_STATUS_RPS) {
+			netdev_err(priv->dev, "receive process stopped\n");
+			x->rx_process_stopped_irq++;
+		}
+		if (intr_status & DMA_STATUS_RWT) {
+			netdev_err(priv->dev, "receive watchdog\n");
+			x->rx_watchdog_irq++;
+		}
+		if (intr_status & DMA_STATUS_ETI) {
+			netdev_err(priv->dev, "transmit early interrupt\n");
+			x->tx_early_irq++;
+		}
+		if (intr_status & DMA_STATUS_TPS) {
+			netdev_err(priv->dev, "transmit process stopped\n");
+			x->tx_process_stopped_irq++;
+			tx_err = true;
+		}
+		if (intr_status & DMA_STATUS_FBI) {
+			netdev_err(priv->dev, "fatal bus error\n");
+			x->fatal_bus_error_irq++;
+			tx_err = true;
+		}
+
+		if (tx_err)
+			xgmac_tx_err(priv);
+	}
+
+	/* TX/RX NORMAL interrupts */
+	if (intr_status & (DMA_STATUS_RI | DMA_STATUS_TU)) {
+		writel(DMA_INTR_ABNORMAL, priv->base + XGMAC_DMA_INTR_ENA);
+		napi_schedule(&priv->napi);
+	}
+
+	return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/* Polling receive - used by NETCONSOLE and other diagnostic tools
+ * to allow network I/O with interrupts disabled. */
+static void xgmac_poll_controller(struct net_device *dev)
+{
+	disable_irq(dev->irq);
+	xgmac_interrupt(dev->irq, dev);
+	enable_irq(dev->irq);
+}
+#endif
+
+struct rtnl_link_stats64 *
+xgmac_get_stats64(struct net_device *dev,
+		       struct rtnl_link_stats64 *storage)
+{
+	struct xgmac_priv *priv = netdev_priv(dev);
+	void __iomem *base = priv->base;
+	u64 count;
+
+	storage->rx_packets = readl(base + XGMAC_MMC_RXFRAME_GB_LO);
+	storage->rx_packets |=
+		(u64)(readl(base + XGMAC_MMC_RXFRAME_GB_HI)) << 32;
+	storage->rx_bytes = readl(base + XGMAC_MMC_RXOCTET_G_LO);
+	storage->rx_bytes |= (u64)(readl(base + XGMAC_MMC_RXOCTET_G_HI)) << 32;
+
+	storage->multicast = readl(base + XGMAC_MMC_RXMCFRAME_G);
+	storage->rx_crc_errors = readl(base + XGMAC_MMC_RXCRCERR);
+	storage->rx_length_errors = readl(base + XGMAC_MMC_RXLENGTHERR);
+	storage->rx_missed_errors = readl(base + XGMAC_MMC_RXOVERFLOW);
+
+	storage->tx_packets = readl(base + XGMAC_MMC_TXFRAME_GB_LO);
+	storage->tx_packets |=
+		(u64)(readl(base + XGMAC_MMC_TXFRAME_GB_HI)) << 32;
+	storage->tx_bytes = readl(base + XGMAC_MMC_TXOCTET_G_LO);
+	storage->tx_bytes |= (u64)(readl(base + XGMAC_MMC_TXOCTET_G_HI)) << 32;
+
+	count = readl(base + XGMAC_MMC_TXFRAME_G_LO);
+	count |= (__u64)(readl(base + XGMAC_MMC_TXFRAME_G_HI)) << 32;
+	storage->tx_errors = storage->tx_packets - count;
+
+	storage->tx_fifo_errors = readl(base + XGMAC_MMC_TXUNDERFLOW);
+
+	return storage;
+}
+
+static int xgmac_set_mac_address(struct net_device *dev, void *p)
+{
+	struct xgmac_priv *priv = netdev_priv(dev);
+	void __iomem *ioaddr = priv->base;
+	struct sockaddr *addr = p;
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
+
+	xgmac_set_mac_addr(ioaddr, dev->dev_addr, 0);
+
+	return 0;
+}
+
+static int xgmac_set_features(struct net_device *dev, u32 features)
+{
+	u32 ctrl;
+	struct xgmac_priv *priv = netdev_priv(dev);
+	void __iomem *ioaddr = priv->base;
+	u32 changed = dev->features ^ features;
+
+	if (!(changed & NETIF_F_RXCSUM))
+		return 0;
+
+	ctrl = readl(ioaddr + XGMAC_CONTROL);
+	if (features & NETIF_F_RXCSUM)
+		ctrl |= XGMAC_CONTROL_IPC;
+	else
+		ctrl &= ~XGMAC_CONTROL_IPC;
+	writel(ctrl, ioaddr + XGMAC_CONTROL);
+
+	return 0;
+}
+
+static const struct net_device_ops xgmac_netdev_ops = {
+	.ndo_open = xgmac_open,
+	.ndo_start_xmit = xgmac_xmit,
+	.ndo_stop = xgmac_release,
+	.ndo_change_mtu = xgmac_change_mtu,
+	.ndo_set_rx_mode = xgmac_set_rx_mode,
+	.ndo_tx_timeout = xgmac_tx_timeout,
+	.ndo_get_stats64 = xgmac_get_stats64,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller = xgmac_poll_controller,
+#endif
+	.ndo_set_mac_address = xgmac_set_mac_address,
+	.ndo_set_features = xgmac_set_features,
+};
+
+static int xgmac_ethtool_getsettings(struct net_device *dev,
+					  struct ethtool_cmd *cmd)
+{
+	cmd->autoneg = 0;
+	cmd->duplex = DUPLEX_FULL;
+	ethtool_cmd_speed_set(cmd, 10000);
+	cmd->supported = SUPPORTED_10000baseT_Full;
+	cmd->advertising = 0;
+	cmd->transceiver = XCVR_INTERNAL;
+	return 0;
+}
+
+static void xgmac_get_pauseparam(struct net_device *netdev,
+				      struct ethtool_pauseparam *pause)
+{
+	struct xgmac_priv *priv = netdev_priv(netdev);
+
+	pause->rx_pause = priv->rx_pause;
+	pause->tx_pause = priv->tx_pause;
+}
+
+static int xgmac_set_pauseparam(struct net_device *netdev,
+				     struct ethtool_pauseparam *pause)
+{
+	struct xgmac_priv *priv = netdev_priv(netdev);
+	return xgmac_set_flow_ctrl(priv, pause->rx_pause, pause->tx_pause);
+}
+
+struct xgmac_stats {
+	char stat_string[ETH_GSTRING_LEN];
+	int stat_offset;
+	bool is_reg;
+};
+
+#define XGMAC_STAT(m)	\
+	{ #m, offsetof(struct xgmac_priv, xstats.m), false }
+#define XGMAC_HW_STAT(m, reg_offset)	\
+	{ #m, reg_offset, true }
+
+static const struct xgmac_stats xgmac_gstrings_stats[] = {
+	XGMAC_STAT(tx_frame_flushed),
+	XGMAC_STAT(tx_payload_error),
+	XGMAC_STAT(tx_ip_header_error),
+	XGMAC_STAT(tx_local_fault),
+	XGMAC_STAT(tx_remote_fault),
+	XGMAC_STAT(rx_watchdog),
+	XGMAC_STAT(da_rx_filter_fail),
+	XGMAC_STAT(sa_rx_filter_fail),
+	XGMAC_STAT(rx_missed_cntr),
+	XGMAC_STAT(rx_overflow_cntr),
+	XGMAC_STAT(tx_undeflow_irq),
+	XGMAC_STAT(tx_process_stopped_irq),
+	XGMAC_STAT(tx_jabber_irq),
+	XGMAC_STAT(rx_overflow_irq),
+	XGMAC_STAT(rx_buf_unav_irq),
+	XGMAC_STAT(rx_process_stopped_irq),
+	XGMAC_STAT(rx_watchdog_irq),
+	XGMAC_STAT(rx_payload_error),
+	XGMAC_STAT(rx_ip_header_error),
+	XGMAC_STAT(tx_early_irq),
+	XGMAC_STAT(fatal_bus_error_irq),
+	XGMAC_HW_STAT(tx_vlan, XGMAC_MMC_TXVLANFRAME),
+	XGMAC_HW_STAT(rx_vlan, XGMAC_MMC_RXVLANFRAME),
+	XGMAC_HW_STAT(tx_pause, XGMAC_MMC_TXPAUSEFRAME),
+	XGMAC_HW_STAT(rx_pause, XGMAC_MMC_RXPAUSEFRAME),
+};
+#define XGMAC_STATS_LEN ARRAY_SIZE(xgmac_gstrings_stats)
+
+static void xgmac_get_ethtool_stats(struct net_device *dev,
+					 struct ethtool_stats *dummy,
+					 u64 *data)
+{
+	struct xgmac_priv *priv = netdev_priv(dev);
+	void *p = priv;
+	int i;
+
+	for (i = 0; i < XGMAC_STATS_LEN; i++) {
+		if (xgmac_gstrings_stats[i].is_reg)
+			*data++ = readl(priv->base +
+				xgmac_gstrings_stats[i].stat_offset);
+		else
+			*data++ = *(u32 *)(p +
+				xgmac_gstrings_stats[i].stat_offset);
+	}
+}
+
+static int xgmac_get_sset_count(struct net_device *netdev, int sset)
+{
+	switch (sset) {
+	case ETH_SS_STATS:
+		return XGMAC_STATS_LEN;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static void xgmac_get_strings(struct net_device *dev, u32 stringset,
+				   u8 *data)
+{
+	int i;
+	u8 *p = data;
+
+	switch (stringset) {
+	case ETH_SS_STATS:
+		for (i = 0; i < XGMAC_STATS_LEN; i++) {
+			memcpy(p, xgmac_gstrings_stats[i].stat_string,
+			       ETH_GSTRING_LEN);
+			p += ETH_GSTRING_LEN;
+		}
+		break;
+	default:
+		WARN_ON(1);
+		break;
+	}
+}
+
+static void xgmac_get_wol(struct net_device *dev,
+			       struct ethtool_wolinfo *wol)
+{
+	struct xgmac_priv *priv = netdev_priv(dev);
+
+	if (device_can_wakeup(priv->device)) {
+		wol->supported = WAKE_MAGIC | WAKE_UCAST;
+		wol->wolopts = priv->wolopts;
+	}
+}
+
+static int xgmac_set_wol(struct net_device *dev,
+			      struct ethtool_wolinfo *wol)
+{
+	struct xgmac_priv *priv = netdev_priv(dev);
+	u32 support = WAKE_MAGIC | WAKE_UCAST;
+
+	if (!device_can_wakeup(priv->device))
+		return -EINVAL;
+
+	if (wol->wolopts & ~support)
+		return -EINVAL;
+
+	priv->wolopts = wol->wolopts;
+
+	if (wol->wolopts) {
+		device_set_wakeup_enable(priv->device, 1);
+		enable_irq_wake(dev->irq);
+	} else {
+		device_set_wakeup_enable(priv->device, 0);
+		disable_irq_wake(dev->irq);
+	}
+
+	return 0;
+}
+
+static struct ethtool_ops xgmac_ethtool_ops = {
+	.get_settings = xgmac_ethtool_getsettings,
+	.get_link = ethtool_op_get_link,
+	.get_pauseparam = xgmac_get_pauseparam,
+	.set_pauseparam = xgmac_set_pauseparam,
+	.get_ethtool_stats = xgmac_get_ethtool_stats,
+	.get_strings = xgmac_get_strings,
+	.get_wol = xgmac_get_wol,
+	.set_wol = xgmac_set_wol,
+	.get_sset_count = xgmac_get_sset_count,
+};
+
+/**
+ * xgmac_probe
+ * @pdev: platform device pointer
+ * Description: the driver is initialized through platform_device.
+ */
+static int xgmac_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+	struct resource *res;
+	struct net_device *ndev = NULL;
+	struct xgmac_priv *priv = NULL;
+	u32 uid;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENODEV;
+
+	if (!request_mem_region(res->start, resource_size(res), pdev->name))
+		return -EBUSY;
+
+	ndev = alloc_etherdev(sizeof(struct xgmac_priv));
+	if (!ndev) {
+		ret = -ENOMEM;
+		goto err_alloc;
+	}
+
+	SET_NETDEV_DEV(ndev, &pdev->dev);
+	priv = netdev_priv(ndev);
+	platform_set_drvdata(pdev, ndev);
+	ether_setup(ndev);
+	ndev->netdev_ops = &xgmac_netdev_ops;
+	SET_ETHTOOL_OPS(ndev, &xgmac_ethtool_ops);
+
+	priv->device = &pdev->dev;
+	priv->dev = ndev;
+	priv->rx_pause = 1;
+	priv->tx_pause = 1;
+
+	priv->base = ioremap(res->start, resource_size(res));
+	if (!priv->base) {
+		netdev_err(ndev, "ioremap failed\n");
+		ret = -ENOMEM;
+		goto err_io;
+	}
+
+	uid = readl(priv->base + XGMAC_VERSION);
+	netdev_info(ndev, "h/w version is 0x%x\n", uid);
+
+	ndev->irq = platform_get_irq(pdev, 0);
+	if (ndev->irq == -ENXIO) {
+		netdev_err(ndev, "No irq resource\n");
+		ret = ndev->irq;
+		goto err_irq;
+	}
+
+	ret = request_irq(ndev->irq, xgmac_interrupt, 0,
+			  dev_name(&pdev->dev), ndev);
+	if (ret < 0) {
+		netdev_err(ndev, "Could not request irq %d - ret %d)\n",
+			ndev->irq, ret);
+		goto err_irq;
+	}
+	disable_irq(ndev->irq);
+
+	priv->pmt_irq = platform_get_irq(pdev, 1);
+	if (priv->pmt_irq == -ENXIO) {
+		netdev_err(ndev, "No pmt irq resource\n");
+		ret = priv->pmt_irq;
+		goto err_pmt_irq;
+	}
+
+	ret = request_irq(priv->pmt_irq, xgmac_pmt_interrupt, 0,
+			  dev_name(&pdev->dev), ndev);
+	if (ret < 0) {
+		netdev_err(ndev, "Could not request irq %d - ret %d)\n",
+			priv->pmt_irq, ret);
+		goto err_pmt_irq;
+	}
+
+	device_set_wakeup_capable(&pdev->dev, 1);
+	if (device_can_wakeup(priv->device))
+		priv->wolopts = WAKE_MAGIC;	/* Magic Frame as default */
+
+	ndev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;
+	if (readl(priv->base + XGMAC_DMA_HW_FEATURE) & DMA_HW_FEAT_TXCOESEL)
+		ndev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
+				     NETIF_F_RXCSUM;
+	ndev->features |= ndev->hw_features;
+	ndev->priv_flags |= IFF_UNICAST_FLT;
+
+	/* Get the MAC address */
+	xgmac_get_mac_addr(priv->base, ndev->dev_addr, 0);
+	if (!is_valid_ether_addr(ndev->dev_addr))
+		netdev_warn(ndev, "MAC address %pM not valid",
+			 ndev->dev_addr);
+
+	netif_napi_add(ndev, &priv->napi, xgmac_poll, 64);
+	ret = register_netdev(ndev);
+	if (ret)
+		goto err_reg;
+
+	return 0;
+
+err_reg:
+	free_irq(priv->pmt_irq, ndev);
+err_pmt_irq:
+	free_irq(ndev->irq, ndev);
+err_irq:
+	iounmap(priv->base);
+err_io:
+	free_netdev(ndev);
+err_alloc:
+	release_mem_region(res->start, resource_size(res));
+	platform_set_drvdata(pdev, NULL);
+	return ret;
+}
+
+/**
+ * xgmac_dvr_remove
+ * @pdev: platform device pointer
+ * Description: this function resets the TX/RX processes, disables the MAC RX/TX
+ * changes the link status, releases the DMA descriptor rings,
+ * unregisters the MDIO bus and unmaps the allocated memory.
+ */
+static int xgmac_remove(struct platform_device *pdev)
+{
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct xgmac_priv *priv = netdev_priv(ndev);
+	struct resource *res;
+
+	xgmac_mac_disable(priv->base);
+
+	/* Free the IRQ lines */
+	free_irq(ndev->irq, ndev);
+	free_irq(priv->pmt_irq, ndev);
+
+	platform_set_drvdata(pdev, NULL);
+	unregister_netdev(ndev);
+
+	iounmap(priv->base);
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	release_mem_region(res->start, resource_size(res));
+
+	free_netdev(ndev);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static void xgmac_pmt(void __iomem *ioaddr, unsigned long mode)
+{
+	unsigned int pmt = 0;
+
+	if (mode & WAKE_MAGIC)
+		pmt |= XGMAC_PMT_POWERDOWN | XGMAC_PMT_MAGIC_PKT;
+	if (mode & WAKE_UCAST)
+		pmt |= XGMAC_PMT_POWERDOWN | XGMAC_PMT_GLBL_UNICAST;
+
+	writel(pmt, ioaddr + XGMAC_PMT);
+}
+
+static int xgmac_suspend(struct device *dev)
+{
+	struct net_device *ndev = platform_get_drvdata(to_platform_device(dev));
+	struct xgmac_priv *priv = netdev_priv(ndev);
+	u32 value;
+
+	if (!ndev || !netif_running(ndev))
+		return 0;
+
+	netif_device_detach(ndev);
+	napi_disable(&priv->napi);
+	writel(0, priv->base + XGMAC_DMA_INTR_ENA);
+
+	if (device_may_wakeup(priv->device)) {
+		/* Stop TX/RX DMA Only */
+		value = readl(priv->base + XGMAC_DMA_CONTROL);
+		value &= ~(DMA_CONTROL_ST | DMA_CONTROL_SR);
+		writel(value, priv->base + XGMAC_DMA_CONTROL);
+
+		xgmac_pmt(priv->base, priv->wolopts);
+	} else
+		xgmac_mac_disable(priv->base);
+
+	return 0;
+}
+
+static int xgmac_resume(struct device *dev)
+{
+	struct net_device *ndev = platform_get_drvdata(to_platform_device(dev));
+	struct xgmac_priv *priv = netdev_priv(ndev);
+	void __iomem *ioaddr = priv->base;
+
+	if (!netif_running(ndev))
+		return 0;
+
+	xgmac_pmt(ioaddr, 0);
+
+	/* Enable the MAC and DMA */
+	xgmac_mac_enable(ioaddr);
+	writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_STATUS);
+	writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_INTR_ENA);
+
+	netif_device_attach(ndev);
+	napi_enable(&priv->napi);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(xgmac_pm_ops, xgmac_suspend, xgmac_resume);
+#define XGMAC_PM_OPS (&xgmac_pm_ops)
+#else
+#define XGMAC_PM_OPS NULL
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct of_device_id xgmac_of_match[] = {
+	{ .compatible = "calxeda,hb-xgmac", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, xgmac_of_match);
+
+static struct platform_driver xgmac_driver = {
+	.driver = {
+		.name = "calxedaxgmac",
+		.of_match_table = xgmac_of_match,
+	},
+	.probe = xgmac_probe,
+	.remove = xgmac_remove,
+	.driver.pm = XGMAC_PM_OPS,
+};
+
+module_platform_driver(xgmac_driver);
+
+MODULE_AUTHOR("Calxeda, Inc.");
+MODULE_DESCRIPTION("Calxeda 10G XGMAC driver");
+MODULE_LICENSE("GPL v2");
-- 
1.7.5.4