oxnas: bring in new oxnas target

Reboot the oxnas target based on Linux 4.14 by rebasing our support on
top of the now-existing upstream kernel support.
This commit brings oxnas support to the level of v4.17 having upstream
drivers for Ethernet, Serial and NAND flash.
Botch up OpenWrt's local drivers for EHCI, SATA and PCIe based on the
new platform code and device-tree.
Re-introduce base-files from old oxnas target which works for now but
needs further clean-up towards generic board support.

Functional issues:
 * PCIe won't come up (hence no USB3 on Shuttle KD20)
 * I2C bus of Akitio myCloud device is likely not to work (missing
   debounce support in new pinctrl driver)

Code-style issues:
 * plla/pllb needs further cleanup -- currently their users or writing
   into the syscon regmap after acquireling the clk instead of using
   defined clk_*_*() functions to setup multipliers and dividors.
 * PCIe phy needs its own little driver.
 * SATA driver is a monster and should be split into an mfd having
   a raidctrl regmap, sata controller, sata ports and sata phy.

Tested on MitraStar STG-212 aka. Medion Akoya MD86xxx and Shuttle KD20.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

3 files changed, 3819 insertions, 0 deletions

diff --git a/target/linux/oxnas/files/drivers/ata/sata_oxnas.c b/target/linux/oxnas/files/drivers/ata/sata_oxnas.c
new file mode 100644
index 0000000000..64afa728a1
--- /dev/null
+++ b/target/linux/oxnas/files/drivers/ata/sata_oxnas.c
@@ -0,0 +1,2505 @@
+/*
+ * sata_oxnas
+ *      A driver to interface the 934 based sata core present in the ox820
+ *      with libata and scsi
+ * based on sata_oxnas driver by Ma Haijun <mahaijuns@gmail.com>
+ * based on ox820 sata code by:
+ *  Copyright (c) 2007 Oxford Semiconductor Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#include <linux/ata.h>
+#include <linux/libata.h>
+#include <linux/of_platform.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/clk.h>
+#include <linux/reset.h>
+
+#include <linux/io.h>
+#include <linux/sizes.h>
+
+static inline void oxnas_register_clear_mask(void __iomem *p, unsigned mask)
+{
+	u32 val = readl_relaxed(p);
+
+	val &= ~mask;
+	writel_relaxed(val, p);
+}
+
+static inline void oxnas_register_set_mask(void __iomem *p, unsigned mask)
+{
+	u32 val = readl_relaxed(p);
+
+	val |= mask;
+	writel_relaxed(val, p);
+}
+
+static inline void oxnas_register_value_mask(void __iomem *p,
+					     unsigned mask, unsigned new_value)
+{
+	/* TODO sanity check mask & new_value = new_value */
+	u32 val = readl_relaxed(p);
+
+	val &= ~mask;
+	val |= new_value;
+	writel_relaxed(val, p);
+}
+
+/* sgdma request structure */
+struct sgdma_request {
+	volatile u32 qualifier;
+	volatile u32 control;
+	dma_addr_t src_pa;
+	dma_addr_t dst_pa;
+} __packed __aligned(4);
+
+
+/* Controller information */
+enum {
+	SATA_OXNAS_MAX_PRD = 254,
+	SATA_OXNAS_DMA_SIZE = SATA_OXNAS_MAX_PRD *
+				sizeof(struct ata_bmdma_prd) +
+				sizeof(struct sgdma_request),
+	SATA_OXNAS_MAX_PORTS	= 2,
+	/** The different Oxsemi SATA core version numbers */
+	SATA_OXNAS_CORE_VERSION = 0x1f3,
+	SATA_OXNAS_IRQ_FLAG	= IRQF_SHARED,
+	SATA_OXNAS_HOST_FLAGS	= (ATA_FLAG_SATA | ATA_FLAG_PIO_DMA |
+			ATA_FLAG_NO_ATAPI /*| ATA_FLAG_NCQ*/),
+	SATA_OXNAS_QUEUE_DEPTH	= 32,
+
+	SATA_OXNAS_DMA_BOUNDARY = 0xFFFFFFFF,
+};
+
+
+/*
+ * SATA Port Registers
+ */
+enum {
+	/** sata host port register offsets */
+	ORB1 = 0x00,
+	ORB2 = 0x04,
+	ORB3 = 0x08,
+	ORB4 = 0x0C,
+	ORB5 = 0x10,
+	MASTER_STATUS = 0x10,
+	FIS_CTRL = 0x18,
+	FIS_DATA = 0x1C,
+	INT_STATUS = 0x30,
+	INT_CLEAR = 0x30,
+	INT_ENABLE = 0x34,
+	INT_DISABLE = 0x38,
+	VERSION = 0x3C,
+	SATA_CONTROL = 0x5C,
+	SATA_COMMAND = 0x60,
+	HID_FEATURES = 0x64,
+	PORT_CONTROL = 0x68,
+	DRIVE_CONTROL = 0x6C,
+	/** These registers allow access to the link layer registers
+	that reside in a different clock domain to the processor bus */
+	LINK_DATA = 0x70,
+	LINK_RD_ADDR = 0x74,
+	LINK_WR_ADDR = 0x78,
+	LINK_CONTROL = 0x7C,
+	/* window control */
+	WIN1LO = 0x80,
+	WIN1HI = 0x84,
+	WIN2LO = 0x88,
+	WIN2HI = 0x8C,
+	WIN0_CONTROL = 0x90,
+};
+
+/** sata port register bits */
+enum{
+	/**
+	 * commands to issue in the master status to tell it to move shadow ,
+	 * registers to the actual device ,
+	 */
+	SATA_OPCODE_MASK = 0x00000007,
+	CMD_WRITE_TO_ORB_REGS_NO_COMMAND = 0x4,
+	CMD_WRITE_TO_ORB_REGS = 0x2,
+	CMD_SYNC_ESCAPE = 0x7,
+	CMD_CORE_BUSY = (1 << 7),
+	CMD_DRIVE_SELECT_SHIFT = 12,
+	CMD_DRIVE_SELECT_MASK = (0xf << CMD_DRIVE_SELECT_SHIFT),
+
+	/** interrupt bits */
+	INT_END_OF_CMD = 1 << 0,
+	INT_LINK_SERROR = 1 << 1,
+	INT_ERROR = 1 << 2,
+	INT_LINK_IRQ = 1 << 3,
+	INT_REG_ACCESS_ERR = 1 << 7,
+	INT_BIST_FIS = 1 << 11,
+	INT_MASKABLE =	INT_END_OF_CMD |
+			INT_LINK_SERROR |
+			INT_ERROR |
+			INT_LINK_IRQ |
+			INT_REG_ACCESS_ERR |
+			INT_BIST_FIS,
+	INT_WANT =	INT_END_OF_CMD |
+			INT_LINK_SERROR |
+			INT_REG_ACCESS_ERR |
+			INT_ERROR,
+	INT_ERRORS =	INT_LINK_SERROR |
+			INT_REG_ACCESS_ERR |
+			INT_ERROR,
+
+	/** raw interrupt bits, unmaskable, but do not generate interrupts */
+	RAW_END_OF_CMD  = INT_END_OF_CMD << 16,
+	RAW_LINK_SERROR = INT_LINK_SERROR  << 16,
+	RAW_ERROR  = INT_ERROR << 16,
+	RAW_LINK_IRQ  = INT_LINK_IRQ << 16,
+	RAW_REG_ACCESS_ERR = INT_REG_ACCESS_ERR << 16,
+	RAW_BIST_FIS  = INT_BIST_FIS << 16,
+	RAW_WANT  = INT_WANT << 16,
+	RAW_ERRORS  = INT_ERRORS << 16,
+
+	/**
+	 * variables to write to the device control register to set the current
+	 * device, ie. master or slave.
+	 */
+	DR_CON_48 = 2,
+	DR_CON_28 = 0,
+
+	SATA_CTL_ERR_MASK = 0x00000016,
+
+};
+
+/* ATA SGDMA register offsets */
+enum {
+	SGDMA_CONTROL = 0x0,
+	SGDMA_STATUS = 0x4,
+	SGDMA_REQUESTPTR = 0x8,
+	SGDMA_RESETS = 0xC,
+	SGDMA_CORESIZE = 0x10,
+};
+
+/* DMA controller register offsets */
+enum {
+	DMA_CONTROL = 0x0,
+	DMA_CORESIZE = 0x20,
+
+	DMA_CONTROL_RESET = (1 << 12),
+};
+
+enum {
+	/* see DMA core docs for the values. Out means from memory (bus A) out
+	 * to disk (bus B) */
+	SGDMA_REQCTL0OUT = 0x0497c03d,
+	/* burst mode disabled when no micro code used */
+	SGDMA_REQCTL0IN = 0x0493a3c1,
+	SGDMA_REQCTL1OUT = 0x0497c07d,
+	SGDMA_REQCTL1IN = 0x0497a3c5,
+	SGDMA_CONTROL_NOGO = 0x3e,
+	SGDMA_CONTROL_GO = SGDMA_CONTROL_NOGO | 1,
+	SGDMA_ERRORMASK = 0x3f,
+	SGDMA_BUSY = 0x80,
+
+	SGDMA_RESETS_CTRL = 1 << 0,
+	SGDMA_RESETS_ARBT = 1 << 1,
+	SGDMA_RESETS_AHB = 1 << 2,
+	SGDMA_RESETS_ALL =	SGDMA_RESETS_CTRL |
+				SGDMA_RESETS_ARBT |
+				SGDMA_RESETS_AHB,
+
+	/* Final EOTs */
+	SGDMA_REQQUAL = 0x00220001,
+
+};
+
+/** SATA core register offsets */
+enum {
+	DM_DBG1 = 0x000,
+	RAID_SET = 0x004,
+	DM_DBG2 = 0x008,
+	DATACOUNT_PORT0 = 0x010,
+	DATACOUNT_PORT1 = 0x014,
+	CORE_INT_STATUS = 0x030,
+	CORE_INT_CLEAR = 0x030,
+	CORE_INT_ENABLE = 0x034,
+	CORE_INT_DISABLE  = 0x038,
+	CORE_REBUILD_ENABLE = 0x050,
+	CORE_FAILED_PORT_R = 0x054,
+	DEVICE_CONTROL = 0x068,
+	EXCESS = 0x06C,
+	RAID_SIZE_LOW = 0x070,
+	RAID_SIZE_HIGH = 0x074,
+	PORT_ERROR_MASK = 0x078,
+	IDLE_STATUS = 0x07C,
+	RAID_CONTROL = 0x090,
+	DATA_PLANE_CTRL = 0x0AC,
+	CORE_DATAPLANE_STAT = 0x0b8,
+	PROC_PC = 0x100,
+	CONFIG_IN = 0x3d8,
+	PROC_START = 0x3f0,
+	PROC_RESET = 0x3f4,
+	UCODE_STORE = 0x1000,
+	RAID_WP_BOT_LOW = 0x1FF0,
+	RAID_WP_BOT_HIGH  = 0x1FF4,
+	RAID_WP_TOP_LOW = 0x1FF8,
+	RAID_WP_TOP_HIGH = 0x1FFC,
+	DATA_MUX_RAM0 = 0x8000,
+	DATA_MUX_RAM1 = 0xA000,
+	PORT_SIZE = 0x10000,
+};
+
+enum {
+	/* Sata core debug1 register bits */
+	CORE_PORT0_DATA_DIR_BIT = 20,
+	CORE_PORT1_DATA_DIR_BIT = 21,
+	CORE_PORT0_DATA_DIR = 1 << CORE_PORT0_DATA_DIR_BIT,
+	CORE_PORT1_DATA_DIR = 1 << CORE_PORT1_DATA_DIR_BIT,
+
+	/** sata core control register bits */
+	SCTL_CLR_ERR = 0x00003016,
+	RAID_CLR_ERR = 0x0000011e,
+
+	/* Interrupts direct from the ports */
+	NORMAL_INTS_WANTED = 0x00000303,
+
+	/* shift these left by port number */
+	COREINT_HOST = 0x00000001,
+	COREINT_END = 0x00000100,
+	CORERAW_HOST = COREINT_HOST << 16,
+	CORERAW_END = COREINT_END  << 16,
+
+	/* Interrupts from the RAID controller only */
+	RAID_INTS_WANTED = 0x00008300,
+
+	/* The bits in the IDLE_STATUS that, when set indicate an idle core */
+	IDLE_CORES = (1 << 18) | (1 << 19),
+
+	/* Data plane control error-mask mask and bit, these bit in the data
+	 * plane control mask out errors from the ports that prevent the SGDMA
+	 * care from sending an interrupt */
+	DPC_ERROR_MASK = 0x00000300,
+	DPC_ERROR_MASK_BIT = 0x00000100,
+	/* enable jbod micro-code */
+	DPC_JBOD_UCODE = 1 << 0,
+	DPC_FIS_SWCH = 1 << 1,
+
+	/** Device Control register bits */
+	DEVICE_CONTROL_DMABT = 1 << 4,
+	DEVICE_CONTROL_ABORT = 1 << 2,
+	DEVICE_CONTROL_PAD = 1 << 3,
+	DEVICE_CONTROL_PADPAT = 1 << 16,
+	DEVICE_CONTROL_PRTRST = 1 << 8,
+	DEVICE_CONTROL_RAMRST = 1 << 12,
+	DEVICE_CONTROL_ATA_ERR_OVERRIDE = 1 << 28,
+
+	/** oxsemi HW raid modes */
+	OXNASSATA_NOTRAID = 0,
+	OXNASSATA_RAID0 = 1,
+	OXNASSATA_RAID1 = 2,
+	/** OX820 specific HW-RAID register values */
+	RAID_TWODISKS = 3,
+	UNKNOWN_MODE = ~0,
+
+	CONFIG_IN_RESUME = 2,
+};
+
+/* SATA PHY Registers */
+enum {
+	PHY_STAT = 0x00,
+	PHY_DATA = 0x04,
+};
+
+enum {
+	STAT_READ_VALID = (1 << 21),
+	STAT_CR_ACK = (1 << 20),
+	STAT_CR_READ = (1 << 19),
+	STAT_CR_WRITE = (1 << 18),
+	STAT_CAP_DATA = (1 << 17),
+	STAT_CAP_ADDR = (1 << 16),
+
+	STAT_ACK_ANY =	STAT_CR_ACK |
+			STAT_CR_READ |
+			STAT_CR_WRITE |
+			STAT_CAP_DATA |
+			STAT_CAP_ADDR,
+
+	CR_READ_ENABLE = (1 << 16),
+	CR_WRITE_ENABLE = (1 << 17),
+	CR_CAP_DATA = (1 << 18),
+};
+
+enum {
+	/* Link layer registers */
+	SERROR_IRQ_MASK = 5,
+};
+
+enum {
+	OXNAS_SATA_SOFTRESET = 1,
+	OXNAS_SATA_REINIT = 2,
+};
+
+enum {
+	OXNAS_SATA_UCODE_RAID0,
+	OXNAS_SATA_UCODE_RAID1,
+	OXNAS_SATA_UCODE_JBOD,
+	OXNAS_SATA_UCODE_NONE,
+};
+
+enum {
+	SATA_UNLOCKED,
+	SATA_WRITER,
+	SATA_READER,
+	SATA_REBUILD,
+	SATA_HWRAID,
+	SATA_SCSI_STACK
+};
+
+typedef irqreturn_t (*oxnas_sata_isr_callback_t)(int, unsigned long, int);
+
+struct sata_oxnas_host_priv {
+	void __iomem *port_base;
+	void __iomem *dmactl_base;
+	void __iomem *sgdma_base;
+	void __iomem *core_base;
+	void __iomem *phy_base;
+	dma_addr_t dma_base;
+	void __iomem *dma_base_va;
+	size_t dma_size;
+	int irq;
+	int n_ports;
+	int current_ucode;
+	u32 port_frozen;
+	u32 port_in_eh;
+	struct clk *clk;
+	struct reset_control *rst_sata;
+	struct reset_control *rst_link;
+	struct reset_control *rst_phy;
+	spinlock_t phy_lock;
+	spinlock_t core_lock;
+	int core_locked;
+	int reentrant_port_no;
+	int hw_lock_count;
+	int direct_lock_count;
+	void *locker_uid;
+	int current_locker_type;
+	int scsi_nonblocking_attempts;
+	oxnas_sata_isr_callback_t isr_callback;
+	void *isr_arg;
+	wait_queue_head_t fast_wait_queue;
+	wait_queue_head_t scsi_wait_queue;
+};
+
+
+struct sata_oxnas_port_priv {
+	void __iomem *port_base;
+	void __iomem *dmactl_base;
+	void __iomem *sgdma_base;
+	void __iomem *core_base;
+	struct sgdma_request *sgdma_request;
+	dma_addr_t sgdma_request_pa;
+};
+
+static u8 sata_oxnas_check_status(struct ata_port *ap);
+static int sata_oxnas_cleanup(struct ata_host *ah);
+static void sata_oxnas_tf_load(struct ata_port *ap,
+				const struct ata_taskfile *tf);
+static void sata_oxnas_irq_on(struct ata_port *ap);
+static void sata_oxnas_post_reset_init(struct ata_port *ap);
+
+static int sata_oxnas_acquire_hw(struct ata_port *ap, int may_sleep,
+				 int timeout_jiffies);
+static void sata_oxnas_release_hw(struct ata_port *ap);
+
+static const void *HW_LOCKER_UID = (void *)0xdeadbeef;
+
+/***************************************************************************
+* ASIC access
+***************************************************************************/
+static void wait_cr_ack(void __iomem *phy_base)
+{
+	while ((ioread32(phy_base + PHY_STAT) >> 16) & 0x1f)
+		; /* wait for an ack bit to be set */
+}
+
+static u16 read_cr(void __iomem *phy_base, u16 address)
+{
+	iowrite32((u32)address, phy_base + PHY_STAT);
+	wait_cr_ack(phy_base);
+	iowrite32(CR_READ_ENABLE, phy_base + PHY_DATA);
+	wait_cr_ack(phy_base);
+	return (u16)ioread32(phy_base + PHY_STAT);
+}
+
+static void write_cr(void __iomem *phy_base, u16 data, u16 address)
+{
+	iowrite32((u32)address, phy_base + PHY_STAT);
+	wait_cr_ack(phy_base);
+	iowrite32((data | CR_CAP_DATA), phy_base + PHY_DATA);
+	wait_cr_ack(phy_base);
+	iowrite32(CR_WRITE_ENABLE, phy_base + PHY_DATA);
+	wait_cr_ack(phy_base);
+}
+
+#define PH_GAIN		 2
+#define FR_GAIN		 3
+#define PH_GAIN_OFFSET  6
+#define FR_GAIN_OFFSET  8
+#define PH_GAIN_MASK  (0x3 << PH_GAIN_OFFSET)
+#define FR_GAIN_MASK  (0x3 << FR_GAIN_OFFSET)
+#define USE_INT_SETTING  (1<<5)
+
+void workaround5458(struct ata_host *ah)
+{
+	struct sata_oxnas_host_priv *hd = ah->private_data;
+	void __iomem *phy_base = hd->phy_base;
+	u16 rx_control;
+	unsigned i;
+
+	for (i = 0; i < 2; i++) {
+		rx_control = read_cr(phy_base, 0x201d + (i << 8));
+		rx_control &= ~(PH_GAIN_MASK | FR_GAIN_MASK);
+		rx_control |= PH_GAIN << PH_GAIN_OFFSET;
+		rx_control |= (FR_GAIN << FR_GAIN_OFFSET) | USE_INT_SETTING;
+		write_cr(phy_base, rx_control, 0x201d+(i<<8));
+	}
+}
+
+/**
+ * allows access to the link layer registers
+ * @param link_reg the link layer register to access (oxsemi indexing ie
+ *		00 = static config, 04 = phy ctrl)
+ */
+void sata_oxnas_link_write(struct ata_port *ap, unsigned int link_reg, u32 val)
+{
+	struct sata_oxnas_port_priv *pd = ap->private_data;
+	struct sata_oxnas_host_priv *hd = ap->host->private_data;
+	void __iomem *port_base = pd->port_base;
+	u32 patience;
+	unsigned long flags;
+
+	DPRINTK("P%d [0x%02x]->0x%08x\n", ap->port_no, link_reg, val);
+
+	spin_lock_irqsave(&hd->phy_lock, flags);
+	iowrite32(val, port_base + LINK_DATA);
+
+	/* accessed twice as a work around for a bug in the SATA abp bridge
+	 * hardware (bug 6828) */
+	iowrite32(link_reg , port_base + LINK_WR_ADDR);
+	ioread32(port_base + LINK_WR_ADDR);
+
+	for (patience = 0x100000; patience > 0; --patience) {
+		if (ioread32(port_base + LINK_CONTROL) & 0x00000001)
+			break;
+	}
+	spin_unlock_irqrestore(&hd->phy_lock, flags);
+}
+
+static int sata_oxnas_scr_write_port(struct ata_port *ap, unsigned int sc_reg,
+					u32 val)
+{
+	sata_oxnas_link_write(ap, 0x20 + (sc_reg * 4), val);
+	return 0;
+}
+
+static int sata_oxnas_scr_write(struct ata_link *link, unsigned int sc_reg,
+				u32 val)
+{
+	return sata_oxnas_scr_write_port(link->ap, sc_reg, val);
+}
+
+u32 sata_oxnas_link_read(struct ata_port *ap, unsigned int link_reg)
+{
+	struct sata_oxnas_port_priv *pd = ap->private_data;
+	struct sata_oxnas_host_priv *hd = ap->host->private_data;
+	void __iomem *port_base = pd->port_base;
+	u32 result;
+	u32 patience;
+	unsigned long flags;
+
+	spin_lock_irqsave(&hd->phy_lock, flags);
+	/* accessed twice as a work around for a bug in the SATA abp bridge
+	 * hardware (bug 6828) */
+	iowrite32(link_reg, port_base + LINK_RD_ADDR);
+	ioread32(port_base + LINK_RD_ADDR);
+
+	for (patience = 0x100000; patience > 0; --patience) {
+		if (ioread32(port_base + LINK_CONTROL) & 0x00000001)
+			break;
+	}
+	if (patience == 0)
+		DPRINTK("link read timed out for port %d\n", ap->port_no);
+
+	result = ioread32(port_base + LINK_DATA);
+	spin_unlock_irqrestore(&hd->phy_lock, flags);
+
+	return result;
+}
+
+static int sata_oxnas_scr_read_port(struct ata_port *ap, unsigned int sc_reg,
+					u32 *val)
+{
+	*val = sata_oxnas_link_read(ap, 0x20 + (sc_reg*4));
+	return 0;
+}
+
+static int sata_oxnas_scr_read(struct ata_link *link,
+			     unsigned int sc_reg, u32 *val)
+{
+	return sata_oxnas_scr_read_port(link->ap, sc_reg, val);
+}
+
+/**
+ * sata_oxnas_irq_clear is called during probe just before the interrupt handler is
+ * registered, to be sure hardware is quiet. It clears and masks interrupt bits
+ * in the SATA core.
+ *
+ * @param ap hardware with the registers in
+ */
+static void sata_oxnas_irq_clear(struct ata_port *ap)
+{
+	struct sata_oxnas_port_priv *port_priv = ap->private_data;
+
+	/* clear pending interrupts */
+	iowrite32(~0, port_priv->port_base + INT_CLEAR);
+	iowrite32(COREINT_END, port_priv->core_base + CORE_INT_CLEAR);
+}
+
+/**
+ * qc_issue is used to make a command active, once the hardware and S/G tables
+ * have been prepared. IDE BMDMA drivers use the helper function
+ * ata_qc_issue_prot() for taskfile protocol-based dispatch. More advanced
+ * drivers roll their own ->qc_issue implementation, using this as the
+ * "issue new ATA command to hardware" hook.
+ * @param qc the queued command to issue
+ */
+static unsigned int sata_oxnas_qc_issue(struct ata_queued_cmd *qc)
+{
+	struct sata_oxnas_port_priv *pd = qc->ap->private_data;
+	struct sata_oxnas_host_priv *hd = qc->ap->host->private_data;
+
+	void __iomem *port_base = pd->port_base;
+	void __iomem *core_base = pd->core_base;
+	int port_no = qc->ap->port_no;
+	int no_microcode = (hd->current_ucode == UNKNOWN_MODE);
+	u32 reg;
+
+	/* check the core is idle */
+	if (ioread32(port_base + SATA_COMMAND) & CMD_CORE_BUSY) {
+		int count = 0;
+
+		DPRINTK("core busy for a command on port %d\n",
+			qc->ap->port_no);
+		do {
+			mdelay(1);
+			if (++count > 100) {
+				DPRINTK("core busy for a command on port %d\n",
+					qc->ap->port_no);
+				/* CrazyDumpDebug(); */
+				sata_oxnas_cleanup(qc->ap->host);
+			}
+		} while (ioread32(port_base + SATA_COMMAND) & CMD_CORE_BUSY);
+	}
+
+	/* enable passing of error signals to DMA sub-core by clearing the
+	 * appropriate bit */
+	reg = ioread32(core_base + DATA_PLANE_CTRL);
+	if (no_microcode)
+		reg |= (DPC_ERROR_MASK_BIT | (DPC_ERROR_MASK_BIT << 1));
+	reg &= ~(DPC_ERROR_MASK_BIT << port_no);
+	iowrite32(reg, core_base + DATA_PLANE_CTRL);
+
+	/* Disable all interrupts for ports and RAID controller */
+	iowrite32(~0, port_base + INT_DISABLE);
+
+	/* Disable all interrupts for core */
+	iowrite32(~0, core_base + CORE_INT_DISABLE);
+	wmb();
+
+	/* Load the command settings into the orb registers */
+	sata_oxnas_tf_load(qc->ap, &qc->tf);
+
+	/* both pio and dma commands use dma */
+	if (ata_is_dma(qc->tf.protocol) || ata_is_pio(qc->tf.protocol)) {
+		/* Start the DMA */
+		iowrite32(SGDMA_CONTROL_GO,	pd->sgdma_base + SGDMA_CONTROL);
+		wmb();
+	}
+
+	/* enable End of command interrupt */
+	iowrite32(INT_WANT, port_base + INT_ENABLE);
+	iowrite32(COREINT_END, core_base + CORE_INT_ENABLE);
+	wmb();
+
+	/* Start the command */
+	reg = ioread32(port_base + SATA_COMMAND);
+	reg &= ~SATA_OPCODE_MASK;
+	reg |= CMD_WRITE_TO_ORB_REGS;
+	iowrite32(reg , port_base + SATA_COMMAND);
+	wmb();
+
+	return 0;
+}
+
+/**
+ * Will schedule the libATA error handler on the premise that there has
+ * been a hotplug event on the port specified
+ */
+void sata_oxnas_checkforhotplug(struct ata_port *ap)
+{
+	DPRINTK("ENTER\n");
+
+	ata_ehi_hotplugged(&ap->link.eh_info);
+	ata_port_freeze(ap);
+}
+
+
+/**************************************************************************/
+/* Locking                                                                */
+/**************************************************************************/
+/**
+ * The underlying function that controls access to the sata core
+ *
+ * @return non-zero indicates that you have acquired exclusive access to the
+ *         sata core.
+ */
+static int __acquire_sata_core(
+	struct ata_host *ah,
+	int port_no,
+	oxnas_sata_isr_callback_t callback,
+	void                    *arg,
+	int                      may_sleep,
+	int                      timeout_jiffies,
+	int                      hw_access,
+	void                    *uid,
+	int                      locker_type)
+{
+	unsigned long end = jiffies + timeout_jiffies;
+	int           acquired = 0;
+	unsigned long flags;
+	int           timed_out = 0;
+	struct sata_oxnas_host_priv *hd;
+
+	DEFINE_WAIT(wait);
+
+	if (!ah)
+		return acquired;
+
+	hd = ah->private_data;
+
+	spin_lock_irqsave(&hd->core_lock, flags);
+
+	DPRINTK("Entered uid %p, port %d, h/w count %d, d count %d, "
+		    "callback %p, hw_access %d, core_locked %d, "
+		    "reentrant_port_no %d, isr_callback %p\n",
+		uid, port_no, hd->hw_lock_count, hd->direct_lock_count,
+		callback, hw_access, hd->core_locked, hd->reentrant_port_no,
+		hd->isr_callback);
+
+	while (!timed_out) {
+		if (hd->core_locked ||
+		    (!hw_access && hd->scsi_nonblocking_attempts)) {
+			/* Can only allow access if from SCSI/SATA stack and if
+			 * reentrant access is allowed and this access is to the
+			 * same port for which the lock is current held
+			 */
+			if (hw_access && (port_no == hd->reentrant_port_no)) {
+				BUG_ON(!hd->hw_lock_count);
+				++(hd->hw_lock_count);
+
+				DPRINTK("Allow SCSI/SATA re-entrant access to "
+					"uid %p port %d\n", uid, port_no);
+				acquired = 1;
+				break;
+			} else if (!hw_access) {
+				if ((locker_type == SATA_READER) &&
+				    (hd->current_locker_type == SATA_READER)) {
+					WARN(1,
+						"Already locked by reader, "
+						"uid %p, locker_uid %p, "
+						"port %d, h/w count %d, "
+						"d count %d, hw_access %d\n",
+						uid, hd->locker_uid, port_no,
+						hd->hw_lock_count,
+						hd->direct_lock_count,
+						hw_access);
+					goto check_uid;
+				}
+
+				if ((locker_type != SATA_READER) &&
+				    (locker_type != SATA_WRITER)) {
+					goto wait_for_lock;
+				}
+
+check_uid:
+				WARN(uid == hd->locker_uid, "Attempt to lock "
+					"by locker type %d uid %p, already "
+					"locked by locker type %d with "
+					"locker_uid %p, port %d, "
+					"h/w count %d, d count %d, "
+					"hw_access %d\n", locker_type, uid,
+					hd->current_locker_type,
+					hd->locker_uid, port_no,
+					hd->hw_lock_count,
+					hd->direct_lock_count, hw_access);
+			}
+		} else {
+			WARN(hd->hw_lock_count || hd->direct_lock_count,
+				"Core unlocked but counts non-zero: uid %p, "
+				"locker_uid %p, port %d, h/w count %d, "
+				"d count %d, hw_access %d\n", uid,
+				hd->locker_uid, port_no, hd->hw_lock_count,
+				hd->direct_lock_count, hw_access);
+
+			BUG_ON(hd->current_locker_type != SATA_UNLOCKED);
+
+			WARN(hd->locker_uid, "Attempt to lock uid %p when "
+				"locker_uid %p is non-zero,  port %d, "
+				"h/w count %d, d count %d, hw_access %d\n",
+				uid, hd->locker_uid, port_no, hd->hw_lock_count,
+				hd->direct_lock_count, hw_access);
+
+			if (!hw_access) {
+				/* Direct access attempting to acquire
+				 * non-contented lock
+				 */
+				/* Must have callback for direct access */
+				BUG_ON(!callback);
+				/* Sanity check lock state */
+				BUG_ON(hd->reentrant_port_no != -1);
+
+				hd->isr_callback = callback;
+				hd->isr_arg = arg;
+				++(hd->direct_lock_count);
+
+				hd->current_locker_type = locker_type;
+			} else {
+				/* SCSI/SATA attempting to acquire
+				 * non-contented lock
+				 */
+				/* No callbacks for SCSI/SATA access */
+				BUG_ON(callback);
+				/* No callback args for SCSI/SATA access */
+				BUG_ON(arg);
+
+				/* Sanity check lock state */
+				BUG_ON(hd->isr_callback);
+				BUG_ON(hd->isr_arg);
+
+				++(hd->hw_lock_count);
+				hd->reentrant_port_no = port_no;
+
+				hd->current_locker_type = SATA_SCSI_STACK;
+			}
+
+			hd->core_locked = 1;
+			hd->locker_uid = uid;
+			acquired = 1;
+			break;
+		}
+
+wait_for_lock:
+		if (!may_sleep) {
+			DPRINTK("Denying for uid %p locker_type %d, "
+			"hw_access %d, port %d, current_locker_type %d as "
+			"cannot sleep\n", uid, locker_type, hw_access, port_no,
+			hd->current_locker_type);
+
+			if (hw_access)
+				++(hd->scsi_nonblocking_attempts);
+
+			break;
+		}
+
+		/* Core is locked and we're allowed to sleep, so wait to be
+		 * awoken when the core is unlocked
+		 */
+		for (;;) {
+			prepare_to_wait(hw_access ? &hd->scsi_wait_queue :
+						    &hd->fast_wait_queue,
+					&wait, TASK_UNINTERRUPTIBLE);
+			if (!hd->core_locked &&
+			    !(!hw_access && hd->scsi_nonblocking_attempts)) {
+				/* We're going to use variables that will have
+				 * been changed by the waker prior to clearing
+				 * core_locked so we need to ensure we see
+				 * changes to all those variables
+				 */
+				smp_rmb();
+				break;
+			}
+			if (time_after(jiffies, end)) {
+				printk(KERN_WARNING "__acquire_sata_core() "
+					"uid %p failing for port %d timed out, "
+					"locker_uid %p, h/w count %d, "
+					"d count %d, callback %p, hw_access %d, "
+					"core_locked %d, reentrant_port_no %d, "
+					"isr_callback %p, isr_arg %p\n", uid,
+					port_no, hd->locker_uid,
+					hd->hw_lock_count,
+					hd->direct_lock_count, callback,
+					hw_access, hd->core_locked,
+					hd->reentrant_port_no, hd->isr_callback,
+					hd->isr_arg);
+				timed_out = 1;
+				break;
+			}
+			spin_unlock_irqrestore(&hd->core_lock, flags);
+			if (!schedule_timeout(4*HZ)) {
+				printk(KERN_INFO "__acquire_sata_core() uid %p, "
+					"locker_uid %p, timed-out of "
+					"schedule(), checking overall timeout\n",
+					uid, hd->locker_uid);
+			}
+			spin_lock_irqsave(&hd->core_lock, flags);
+		}
+		finish_wait(hw_access ? &hd->scsi_wait_queue :
+					&hd->fast_wait_queue, &wait);
+	}
+
+	if (hw_access && acquired) {
+		if (hd->scsi_nonblocking_attempts)
+			hd->scsi_nonblocking_attempts = 0;
+
+		/* Wake any other SCSI/SATA waiters so they can get reentrant
+		 * access to the same port if appropriate. This is because if
+		 * the SATA core is locked by fast access, or SCSI/SATA access
+		 * to other port, then can have >1 SCSI/SATA waiters on the wait
+		 * list so want to give reentrant accessors a chance to get
+		 * access ASAP
+		 */
+		if (!list_empty(&hd->scsi_wait_queue.head))
+			wake_up(&hd->scsi_wait_queue);
+	}
+
+	DPRINTK("Leaving uid %p with acquired = %d, port %d, callback %p\n",
+		uid, acquired, port_no, callback);
+
+	spin_unlock_irqrestore(&hd->core_lock, flags);
+
+	return acquired;
+}
+
+int sata_core_has_fast_waiters(struct ata_host *ah)
+{
+	int has_waiters;
+	unsigned long flags;
+	struct sata_oxnas_host_priv *hd = ah->private_data;
+
+	spin_lock_irqsave(&hd->core_lock, flags);
+	has_waiters = !list_empty(&hd->fast_wait_queue.head);
+	spin_unlock_irqrestore(&hd->core_lock, flags);
+
+	return has_waiters;
+}
+EXPORT_SYMBOL(sata_core_has_fast_waiters);
+
+int sata_core_has_scsi_waiters(struct ata_host *ah)
+{
+	int has_waiters;
+	unsigned long flags;
+	struct sata_oxnas_host_priv *hd = ah->private_data;
+
+	spin_lock_irqsave(&hd->core_lock, flags);
+	has_waiters = hd->scsi_nonblocking_attempts ||
+		      !list_empty(&hd->scsi_wait_queue.head);
+	spin_unlock_irqrestore(&hd->core_lock, flags);
+
+	return has_waiters;
+}
+EXPORT_SYMBOL(sata_core_has_scsi_waiters);
+
+/*
+ * ata_port operation to gain ownership of the SATA hardware prior to issuing
+ * a command against a SATA host. Allows any number of users of the port against
+ * which the lock was first acquired, thus enforcing that only one SATA core
+ * port may be operated on at once.
+ */
+static int sata_oxnas_acquire_hw(
+	struct ata_port *ap,
+	int may_sleep,
+	int timeout_jiffies)
+{
+	return __acquire_sata_core(ap->host, ap->port_no, NULL, 0, may_sleep,
+				   timeout_jiffies, 1, (void *)HW_LOCKER_UID,
+				   SATA_SCSI_STACK);
+}
+
+/*
+ * operation to release ownership of the SATA hardware
+ */
+static void sata_oxnas_release_hw(struct ata_port *ap)
+{
+	unsigned long flags;
+	int released = 0;
+	struct sata_oxnas_host_priv *hd = ap->host->private_data;
+
+	spin_lock_irqsave(&hd->core_lock, flags);
+
+	DPRINTK("Entered port_no = %d, h/w count %d, d count %d, "
+		"core locked = %d, reentrant_port_no = %d, isr_callback %p\n",
+		ap->port_no, hd->hw_lock_count, hd->direct_lock_count,
+		hd->core_locked, hd->reentrant_port_no, hd->isr_callback);
+
+	if (!hd->core_locked) {
+		/* Nobody holds the SATA lock */
+		printk(KERN_WARNING "Nobody holds SATA lock, port_no %d\n",
+		       ap->port_no);
+		released = 1;
+	} else if (!hd->hw_lock_count) {
+		/* SCSI/SATA has released without holding the lock */
+		printk(KERN_WARNING "SCSI/SATA does not hold SATA lock, "
+		       "port_no %d\n", ap->port_no);
+	} else {
+		/* Trap incorrect usage */
+		BUG_ON(hd->reentrant_port_no == -1);
+		BUG_ON(ap->port_no != hd->reentrant_port_no);
+		BUG_ON(hd->direct_lock_count);
+		BUG_ON(hd->current_locker_type != SATA_SCSI_STACK);
+
+		WARN(!hd->locker_uid || (hd->locker_uid != HW_LOCKER_UID),
+			"Invalid locker uid %p, h/w count %d, d count %d, "
+			"reentrant_port_no %d, core_locked %d, "
+			"isr_callback %p\n", hd->locker_uid, hd->hw_lock_count,
+			hd->direct_lock_count, hd->reentrant_port_no,
+			hd->core_locked, hd->isr_callback);
+
+		if (--(hd->hw_lock_count)) {
+			DPRINTK("Still nested port_no %d\n", ap->port_no);
+		} else {
+			DPRINTK("Release port_no %d\n", ap->port_no);
+			hd->reentrant_port_no = -1;
+			hd->isr_callback = NULL;
+			hd->current_locker_type = SATA_UNLOCKED;
+			hd->locker_uid = 0;
+			hd->core_locked = 0;
+			released = 1;
+			wake_up(!list_empty(&hd->scsi_wait_queue.head) ?
+						&hd->scsi_wait_queue :
+						&hd->fast_wait_queue);
+		}
+	}
+
+	DPRINTK("Leaving, port_no %d, count %d\n", ap->port_no,
+		hd->hw_lock_count);
+
+	spin_unlock_irqrestore(&hd->core_lock, flags);
+
+	/* CONFIG_SATA_OX820_DIRECT_HWRAID */
+	/*    if (released)
+	     ox820hwraid_restart_queue();
+	} */
+}
+
+static inline int sata_oxnas_is_host_frozen(struct ata_host *ah)
+{
+	struct sata_oxnas_host_priv *hd = ah->private_data;
+
+	smp_rmb();
+	return hd->port_in_eh || hd->port_frozen;
+}
+
+
+static inline u32 sata_oxnas_hostportbusy(struct ata_port *ap)
+{
+	struct sata_oxnas_host_priv *hd = ap->host->private_data;
+
+	return (ioread32(hd->port_base + SATA_COMMAND) & CMD_CORE_BUSY) ||
+	       (hd->n_ports > 1 &&
+		(ioread32(hd->port_base + PORT_SIZE + SATA_COMMAND) &
+		 CMD_CORE_BUSY));
+}
+
+static inline u32 sata_oxnas_hostdmabusy(struct ata_port *ap)
+{
+	struct sata_oxnas_port_priv *pd = ap->private_data;
+
+	return ioread32(pd->sgdma_base + SGDMA_STATUS) & SGDMA_BUSY;
+}
+
+
+/**
+ * Turns on the cores clock and resets it
+ */
+static void sata_oxnas_reset_core(struct ata_host *ah)
+{
+	struct sata_oxnas_host_priv *host_priv = ah->private_data;
+	int n;
+
+	DPRINTK("ENTER\n");
+	clk_prepare_enable(host_priv->clk);
+
+	reset_control_assert(host_priv->rst_sata);
+	reset_control_assert(host_priv->rst_link);
+	reset_control_assert(host_priv->rst_phy);
+
+	udelay(50);
+
+	/* un-reset the PHY, then Link and Controller */
+	reset_control_deassert(host_priv->rst_phy);
+	udelay(50);
+
+	reset_control_deassert(host_priv->rst_sata);
+	reset_control_deassert(host_priv->rst_link);
+	udelay(50);
+
+	workaround5458(ah);
+	/* tune for sata compatibility */
+	sata_oxnas_link_write(ah->ports[0], 0x60, 0x2988);
+
+	for (n = 0; n < host_priv->n_ports; n++) {
+		/* each port in turn */
+		sata_oxnas_link_write(ah->ports[n], 0x70, 0x55629);
+	}
+	udelay(50);
+}
+
+
+/**
+ * Called after an identify device command has worked out what kind of device
+ * is on the port
+ *
+ * @param port The port to configure
+ * @param pdev The hardware associated with controlling the port
+ */
+static void sata_oxnas_dev_config(struct ata_device *pdev)
+{
+	struct sata_oxnas_port_priv *pd = pdev->link->ap->private_data;
+	void __iomem *port_base = pd->port_base;
+	u32 reg;
+
+	DPRINTK("ENTER\n");
+	/* Set the bits to put the port into 28 or 48-bit node */
+	reg = ioread32(port_base + DRIVE_CONTROL);
+	reg &= ~3;
+	reg |= (pdev->flags & ATA_DFLAG_LBA48) ? DR_CON_48 : DR_CON_28;
+	iowrite32(reg, port_base + DRIVE_CONTROL);
+
+	/* if this is an ATA-6 disk, put port into ATA-5 auto translate mode */
+	if (pdev->flags & ATA_DFLAG_LBA48) {
+		reg = ioread32(port_base + PORT_CONTROL);
+		reg |= 2;
+		iowrite32(reg, port_base + PORT_CONTROL);
+	}
+}
+/**
+ * called to write a taskfile into the ORB registers
+ * @param ap hardware with the registers in
+ * @param tf taskfile to write to the registers
+ */
+static void sata_oxnas_tf_load(struct ata_port *ap,
+				const struct ata_taskfile *tf)
+{
+	u32 count = 0;
+	u32 Orb1 = 0;
+	u32 Orb2 = 0;
+	u32 Orb3 = 0;
+	u32 Orb4 = 0;
+	u32 Command_Reg;
+
+	struct sata_oxnas_port_priv *port_priv = ap->private_data;
+	void __iomem *port_base = port_priv->port_base;
+	unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
+
+	/* wait a maximum of 10ms for the core to be idle */
+	do {
+		Command_Reg = ioread32(port_base + SATA_COMMAND);
+		if (!(Command_Reg & CMD_CORE_BUSY))
+			break;
+		count++;
+		udelay(50);
+	} while (count < 200);
+
+	/* check if the ctl register has interrupts disabled or enabled and
+	 * modify the interrupt enable registers on the ata core as required */
+	if (tf->ctl & ATA_NIEN) {
+		/* interrupts disabled */
+		u32 mask = (COREINT_END << ap->port_no);
+
+		iowrite32(mask, port_priv->core_base + CORE_INT_DISABLE);
+		sata_oxnas_irq_clear(ap);
+	} else {
+		sata_oxnas_irq_on(ap);
+	}
+
+	Orb2 |= (tf->command) << 24;
+
+	/* write 48 or 28 bit tf parameters */
+	if (is_addr) {
+		/* set LBA bit as it's an address */
+		Orb1 |= (tf->device & ATA_LBA) << 24;
+
+		if (tf->flags & ATA_TFLAG_LBA48) {
+			Orb1 |= ATA_LBA << 24;
+			Orb2 |= (tf->hob_nsect) << 8;
+			Orb3 |= (tf->hob_lbal) << 24;
+			Orb4 |= (tf->hob_lbam) << 0;
+			Orb4 |= (tf->hob_lbah) << 8;
+			Orb4 |= (tf->hob_feature) << 16;
+		} else {
+			Orb3 |= (tf->device & 0xf) << 24;
+		}
+
+		/* write 28-bit lba */
+		Orb2 |= (tf->nsect) << 0;
+		Orb2 |= (tf->feature) << 16;
+		Orb3 |= (tf->lbal) << 0;
+		Orb3 |= (tf->lbam) << 8;
+		Orb3 |= (tf->lbah) << 16;
+		Orb4 |= (tf->ctl) << 24;
+	}
+
+	if (tf->flags & ATA_TFLAG_DEVICE)
+		Orb1 |= (tf->device) << 24;
+
+	ap->last_ctl = tf->ctl;
+
+	/* write values to registers */
+	iowrite32(Orb1, port_base + ORB1);
+	iowrite32(Orb2, port_base + ORB2);
+	iowrite32(Orb3, port_base + ORB3);
+	iowrite32(Orb4, port_base + ORB4);
+}
+
+
+void sata_oxnas_set_mode(struct ata_host *ah, u32 mode, u32 force)
+{
+	struct sata_oxnas_host_priv *host_priv = ah->private_data;
+	void __iomem *core_base = host_priv->core_base;
+
+	unsigned int *src;
+	void __iomem *dst;
+	unsigned int progmicrocode = 0;
+	unsigned int changeparameters = 0;
+
+	u32 previous_mode;
+
+	/* these micro-code programs _should_ include the version word */
+
+	/* JBOD */
+	static const unsigned int jbod[] = {
+		0x07B400AC, 0x0228A280, 0x00200001, 0x00204002, 0x00224001,
+		0x00EE0009, 0x00724901, 0x01A24903, 0x00E40009, 0x00224001,
+		0x00621120, 0x0183C908, 0x00E20005, 0x00718908, 0x0198A206,
+		0x00621124, 0x0183C908, 0x00E20046, 0x00621104, 0x0183C908,
+		0x00E20015, 0x00EE009D, 0x01A3E301, 0x00E2001B, 0x0183C900,
+		0x00E2001B, 0x00210001, 0x00EE0020, 0x01A3E302, 0x00E2009D,
+		0x0183C901, 0x00E2009D, 0x00210002, 0x0235D700, 0x0208A204,
+		0x0071C908, 0x000F8207, 0x000FC207, 0x0071C920, 0x000F8507,
+		0x000FC507, 0x0228A240, 0x02269A40, 0x00094004, 0x00621104,
+		0x0180C908, 0x00E40031, 0x00621112, 0x01A3C801, 0x00E2002B,
+		0x00294000, 0x0228A220, 0x01A69ABF, 0x002F8000, 0x002FC000,
+		0x0198A204, 0x0001C022, 0x01B1A220, 0x0001C106, 0x00088007,
+		0x0183C903, 0x00E2009D, 0x0228A220, 0x0071890C, 0x0208A206,
+		0x0198A206, 0x0001C022, 0x01B1A220, 0x0001C106, 0x00088007,
+		0x00EE009D, 0x00621104, 0x0183C908, 0x00E2004A, 0x00EE009D,
+		0x01A3C901, 0x00E20050, 0x0021E7FF, 0x0183E007, 0x00E2009D,
+		0x00EE0054, 0x0061600B, 0x0021E7FF, 0x0183C507, 0x00E2009D,
+		0x01A3E301, 0x00E2005A, 0x0183C900, 0x00E2005A, 0x00210001,
+		0x00EE005F, 0x01A3E302, 0x00E20005, 0x0183C901, 0x00E20005,
+		0x00210002, 0x0235D700, 0x0208A204, 0x000F8109, 0x000FC109,
+		0x0071C918, 0x000F8407, 0x000FC407, 0x0001C022, 0x01A1A2BF,
+		0x0001C106, 0x00088007, 0x02269A40, 0x00094004, 0x00621112,
+		0x01A3C801, 0x00E4007F, 0x00621104, 0x0180C908, 0x00E4008D,
+		0x00621128, 0x0183C908, 0x00E2006C, 0x01A3C901, 0x00E2007B,
+		0x0021E7FF, 0x0183E007, 0x00E2007F, 0x00EE006C, 0x0061600B,
+		0x0021E7FF, 0x0183C507, 0x00E4006C, 0x00621111, 0x01A3C801,
+		0x00E2007F, 0x00621110, 0x01A3C801, 0x00E20082, 0x0228A220,
+		0x00621119, 0x01A3C801, 0x00E20086, 0x0001C022, 0x01B1A220,
+		0x0001C106, 0x00088007, 0x0198A204, 0x00294000, 0x01A69ABF,
+		0x002F8000, 0x002FC000, 0x0183C903, 0x00E20005, 0x0228A220,
+		0x0071890C, 0x0208A206, 0x0198A206, 0x0001C022, 0x01B1A220,
+		0x0001C106, 0x00088007, 0x00EE009D, 0x00621128, 0x0183C908,
+		0x00E20005, 0x00621104, 0x0183C908, 0x00E200A6, 0x0062111C,
+		0x0183C908, 0x00E20005, 0x0071890C, 0x0208A206, 0x0198A206,
+		0x00718908, 0x0208A206, 0x00EE0005, ~0
+	};
+
+	/* Bi-Modal RAID-0/1 */
+	static const unsigned int raid[] = {
+		0x00F20145, 0x00EE20FA, 0x00EE20A7, 0x0001C009, 0x00EE0004,
+		0x00220000, 0x0001000B, 0x037003FF, 0x00700018, 0x037003FE,
+		0x037043FD, 0x00704118, 0x037043FC, 0x01A3D240, 0x00E20017,
+		0x00B3C235, 0x00E40018, 0x0093C104, 0x00E80014, 0x0093C004,
+		0x00E80017, 0x01020000, 0x00274020, 0x00EE0083, 0x0080C904,
+		0x0093C104, 0x00EA0020, 0x0093C103, 0x00EC001F, 0x00220002,
+		0x00924104, 0x0005C009, 0x00EE0058, 0x0093CF04, 0x00E80026,
+		0x00900F01, 0x00600001, 0x00910400, 0x00EE0058, 0x00601604,
+		0x01A00003, 0x00E2002C, 0x01018000, 0x00274040, 0x00EE0083,
+		0x0093CF03, 0x00EC0031, 0x00220003, 0x00924F04, 0x0005C009,
+		0x00810104, 0x00B3C235, 0x00E20037, 0x0022C000, 0x00218210,
+		0x00EE0039, 0x0022C001, 0x00218200, 0x00600401, 0x00A04901,
+		0x00604101, 0x01A0C401, 0x00E20040, 0x00216202, 0x00EE0041,
+		0x00216101, 0x02018506, 0x00EE2141, 0x00904901, 0x00E20049,
+		0x00A00401, 0x00600001, 0x02E0C301, 0x00EE2141, 0x00216303,
+		0x037003EE, 0x01A3C001, 0x00E40105, 0x00250080, 0x00204000,
+		0x002042F1, 0x0004C001, 0x00230001, 0x00100006, 0x02C18605,
+		0x00100006, 0x01A3D502, 0x00E20055, 0x00EE0053, 0x00004009,
+		0x00000004, 0x00B3C235, 0x00E40062, 0x0022C001, 0x0020C000,
+		0x00EE2141, 0x0020C001, 0x00EE2141, 0x00EE006B, 0x0022C000,
+		0x0060D207, 0x00EE2141, 0x00B3C242, 0x00E20069, 0x01A3D601,
+		0x00E2006E, 0x02E0C301, 0x00EE2141, 0x00230001, 0x00301303,
+		0x00EE007B, 0x00218210, 0x01A3C301, 0x00E20073, 0x00216202,
+		0x00EE0074, 0x00216101, 0x02018506, 0x00214000, 0x037003EE,
+		0x01A3C001, 0x00E40108, 0x00230001, 0x00100006, 0x00250080,
+		0x00204000, 0x002042F1, 0x0004C001, 0x00EE007F, 0x0024C000,
+		0x01A3D1F0, 0x00E20088, 0x00230001, 0x00300000, 0x01A3D202,
+		0x00E20085, 0x00EE00A5, 0x00B3C800, 0x00E20096, 0x00218000,
+		0x00924709, 0x0005C009, 0x00B20802, 0x00E40093, 0x037103FD,
+		0x00710418, 0x037103FC, 0x00EE0006, 0x00220000, 0x0001000F,
+		0x00EE0006, 0x00800B0C, 0x00B00001, 0x00204000, 0x00208550,
+		0x00208440, 0x002083E0, 0x00208200, 0x00208100, 0x01008000,
+		0x037083EE, 0x02008212, 0x02008216, 0x01A3C201, 0x00E400A5,
+		0x0100C000, 0x00EE20FA, 0x02800000, 0x00208000, 0x00B24C00,
+		0x00E400AD, 0x00224001, 0x00724910, 0x0005C009, 0x00B3CDC4,
+		0x00E200D5, 0x00B3CD29, 0x00E200D5, 0x00B3CD20, 0x00E200D5,
+		0x00B3CD24, 0x00E200D5, 0x00B3CDC5, 0x00E200D2, 0x00B3CD39,
+		0x00E200D2, 0x00B3CD30, 0x00E200D2, 0x00B3CD34, 0x00E200D2,
+		0x00B3CDCA, 0x00E200CF, 0x00B3CD35, 0x00E200CF, 0x00B3CDC8,
+		0x00E200CC, 0x00B3CD25, 0x00E200CC, 0x00B3CD40, 0x00E200CB,
+		0x00B3CD42, 0x00E200CB, 0x01018000, 0x00EE0083, 0x0025C000,
+		0x036083EE, 0x0000800D, 0x00EE00D8, 0x036083EE, 0x00208035,
+		0x00EE00DA, 0x036083EE, 0x00208035, 0x00EE00DA, 0x00208007,
+		0x036083EE, 0x00208025, 0x036083EF, 0x02400000, 0x01A3D208,
+		0x00E200D8, 0x0067120A, 0x0021C000, 0x0021C224, 0x00220000,
+		0x00404B1C, 0x00600105, 0x00800007, 0x0020C00E, 0x00214000,
+		0x01004000, 0x01A0411F, 0x00404E01, 0x01A3C101, 0x00E200F1,
+		0x00B20800, 0x00E400D8, 0x00220001, 0x0080490B, 0x00B04101,
+		0x0040411C, 0x00EE00E1, 0x02269A01, 0x01020000, 0x02275D80,
+		0x01A3D202, 0x00E200F4, 0x01B75D80, 0x01030000, 0x01B69A01,
+		0x00EE00D8, 0x01A3D204, 0x00E40104, 0x00224000, 0x0020C00E,
+		0x0020001E, 0x00214000, 0x01004000, 0x0212490E, 0x00214001,
+		0x01004000, 0x02400000, 0x00B3D702, 0x00E80112, 0x00EE010E,
+		0x00B3D702, 0x00E80112, 0x00B3D702, 0x00E4010E, 0x00230001,
+		0x00EE0140, 0x00200005, 0x036003EE, 0x00204001, 0x00EE0116,
+		0x00230001, 0x00100006, 0x02C18605, 0x00100006, 0x01A3D1F0,
+		0x00E40083, 0x037003EE, 0x01A3C002, 0x00E20121, 0x0020A300,
+		0x0183D102, 0x00E20124, 0x037003EE, 0x01A00005, 0x036003EE,
+		0x01A0910F, 0x00B3C20F, 0x00E2012F, 0x01A3D502, 0x00E20116,
+		0x01A3C002, 0x00E20116, 0x00B3D702, 0x00E4012C, 0x00300000,
+		0x00EE011F, 0x02C18605, 0x00100006, 0x00EE0116, 0x01A3D1F0,
+		0x00E40083, 0x037003EE, 0x01A3C004, 0x00E20088, 0x00200003,
+		0x036003EE, 0x01A3D502, 0x00E20136, 0x00230001, 0x00B3C101,
+		0x00E4012C, 0x00100006, 0x02C18605, 0x00100006, 0x00204000,
+		0x00EE0116, 0x00100006, 0x01A3D1F0, 0x00E40083, 0x01000000,
+		0x02400000, ~0
+	};
+
+	DPRINTK("ENTER: mode:%d, force:%d\n", mode, force);
+
+	if (force)
+		previous_mode = UNKNOWN_MODE;
+	else
+		previous_mode = host_priv->current_ucode;
+
+	if (mode == previous_mode)
+		return;
+
+	host_priv->current_ucode = mode;
+
+	/* decide what needs to be done using the STD in my logbook */
+	switch (previous_mode) {
+	case OXNASSATA_RAID1:
+		switch (mode) {
+		case OXNASSATA_RAID0:
+			changeparameters = 1;
+			break;
+		case OXNASSATA_NOTRAID:
+			changeparameters = 1;
+			progmicrocode = 1;
+			break;
+		}
+		break;
+	case OXNASSATA_RAID0:
+		switch (mode) {
+		case OXNASSATA_RAID1:
+			changeparameters = 1;
+			break;
+		case OXNASSATA_NOTRAID:
+			changeparameters = 1;
+			progmicrocode = 1;
+			break;
+		}
+		break;
+	case OXNASSATA_NOTRAID:
+		switch (mode) {
+		case OXNASSATA_RAID0:
+		case OXNASSATA_RAID1:
+			changeparameters = 1;
+			progmicrocode = 1;
+			break;
+		}
+		break;
+	case UNKNOWN_MODE:
+		changeparameters = 1;
+		progmicrocode = 1;
+		break;
+	}
+
+	/* no need to reprogram everything if already in the right mode */
+	if (progmicrocode) {
+		/* reset micro-code processor */
+		iowrite32(1, core_base + PROC_RESET);
+		wmb();
+
+		/* select micro-code */
+		switch (mode) {
+		case OXNASSATA_RAID1:
+		case OXNASSATA_RAID0:
+			VPRINTK("Loading RAID micro-code\n");
+			src = (unsigned int *)&raid[1];
+			break;
+		case OXNASSATA_NOTRAID:
+			VPRINTK("Loading JBOD micro-code\n");
+			src = (unsigned int *)&jbod[1];
+			break;
+		default:
+			BUG();
+			break;
+		}
+
+		/* load micro code */
+		dst = core_base + UCODE_STORE;
+		while (*src != ~0) {
+			iowrite32(*src, dst);
+			src++;
+			dst += sizeof(*src);
+		}
+		wmb();
+	}
+
+	if (changeparameters) {
+		u32 reg;
+		/* set other mode dependent flags */
+		switch (mode) {
+		case OXNASSATA_RAID1:
+			/* clear JBOD mode */
+			reg = ioread32(core_base + DATA_PLANE_CTRL);
+			reg |= DPC_JBOD_UCODE;
+			reg &= ~DPC_FIS_SWCH;
+			iowrite32(reg, core_base + DATA_PLANE_CTRL);
+			wmb();
+
+			/* set the hardware up for RAID-1 */
+			iowrite32(0, core_base + RAID_WP_BOT_LOW);
+			iowrite32(0, core_base + RAID_WP_BOT_HIGH);
+			iowrite32(0xffffffff, core_base + RAID_WP_TOP_LOW);
+			iowrite32(0x7fffffff, core_base + RAID_WP_TOP_HIGH);
+			iowrite32(0, core_base + RAID_SIZE_LOW);
+			iowrite32(0, core_base + RAID_SIZE_HIGH);
+			wmb();
+			break;
+		case OXNASSATA_RAID0:
+			/* clear JBOD mode */
+			reg = ioread32(core_base + DATA_PLANE_CTRL);
+			reg |= DPC_JBOD_UCODE;
+			reg &= ~DPC_FIS_SWCH;
+			iowrite32(reg, core_base + DATA_PLANE_CTRL);
+			wmb();
+
+			/* set the hardware up for RAID-1 */
+			iowrite32(0, core_base + RAID_WP_BOT_LOW);
+			iowrite32(0, core_base + RAID_WP_BOT_HIGH);
+			iowrite32(0xffffffff, core_base + RAID_WP_TOP_LOW);
+			iowrite32(0x7fffffff, core_base + RAID_WP_TOP_HIGH);
+			iowrite32(0xffffffff, core_base + RAID_SIZE_LOW);
+			iowrite32(0x7fffffff, core_base + RAID_SIZE_HIGH);
+			wmb();
+			break;
+		case OXNASSATA_NOTRAID:
+			/* enable jbod mode */
+			reg = ioread32(core_base + DATA_PLANE_CTRL);
+			reg &= ~DPC_JBOD_UCODE;
+			reg &= ~DPC_FIS_SWCH;
+			iowrite32(reg, core_base + DATA_PLANE_CTRL);
+			wmb();
+
+			/* start micro-code processor*/
+			iowrite32(1, core_base + PROC_START);
+			break;
+		default:
+			reg = ioread32(core_base + DATA_PLANE_CTRL);
+			reg |= DPC_JBOD_UCODE;
+			reg &= ~DPC_FIS_SWCH;
+			iowrite32(reg, core_base + DATA_PLANE_CTRL);
+			wmb();
+			break;
+		}
+	}
+}
+
+/**
+ * sends a sync-escape if there is a link present
+ */
+static inline void sata_oxnas_send_sync_escape(struct ata_port *ap)
+{
+	struct sata_oxnas_port_priv *pd = ap->private_data;
+	u32 reg;
+
+	/* read the SSTATUS register and only send a sync escape if there is a
+	* link active */
+	if ((sata_oxnas_link_read(ap, 0x20) & 3) == 3) {
+		reg = ioread32(pd->port_base + SATA_COMMAND);
+		reg &= ~SATA_OPCODE_MASK;
+		reg |= CMD_SYNC_ESCAPE;
+		iowrite32(reg, pd->port_base + SATA_COMMAND);
+	}
+}
+
+/* clears errors */
+static inline void sata_oxnas_clear_CS_error(struct ata_port *ap)
+{
+	struct sata_oxnas_port_priv *pd = ap->private_data;
+	u32 *base = pd->port_base;
+	u32 reg;
+
+	reg = ioread32(base + SATA_CONTROL);
+	reg &= SATA_CTL_ERR_MASK;
+	iowrite32(reg, base + SATA_CONTROL);
+}
+
+static inline void sata_oxnas_reset_sgdma(struct ata_port *ap)
+{
+	struct sata_oxnas_port_priv *pd = ap->private_data;
+
+	iowrite32(SGDMA_RESETS_CTRL, pd->sgdma_base + SGDMA_RESETS);
+}
+
+static inline void sata_oxnas_reset_dma(struct ata_port *ap, int assert)
+{
+	struct sata_oxnas_port_priv *pd = ap->private_data;
+	u32 reg;
+
+	reg = ioread32(pd->dmactl_base + DMA_CONTROL);
+	if (assert)
+		reg |= DMA_CONTROL_RESET;
+	else
+		reg &= ~DMA_CONTROL_RESET;
+
+	iowrite32(reg, pd->dmactl_base + DMA_CONTROL);
+};
+
+/**
+ * Clears the error caused by the core's registers being accessed when the
+ * core is busy.
+ */
+static inline void sata_oxnas_clear_reg_access_error(struct ata_port *ap)
+{
+	struct sata_oxnas_port_priv *pd = ap->private_data;
+	u32 *base = pd->port_base;
+	u32 reg;
+
+	reg = ioread32(base + INT_STATUS);
+
+	DPRINTK("ENTER\n");
+	if (reg & INT_REG_ACCESS_ERR) {
+		DPRINTK("clearing register access error on port %d\n",
+			ap->port_no);
+		iowrite32(INT_REG_ACCESS_ERR, base + INT_STATUS);
+	}
+	reg = ioread32(base + INT_STATUS);
+	if (reg & INT_REG_ACCESS_ERR)
+		DPRINTK("register access error didn't clear\n");
+}
+
+static inline void sata_oxnas_clear_sctl_error(struct ata_port *ap)
+{
+	struct sata_oxnas_port_priv *pd = ap->private_data;
+	u32 *base = pd->port_base;
+	u32 reg;
+
+	reg = ioread32(base + SATA_CONTROL);
+	reg |= SCTL_CLR_ERR;
+	iowrite32(reg, base + SATA_CONTROL);
+}
+
+static inline void sata_oxnas_clear_raid_error(struct ata_host *ah)
+{
+	return;
+};
+
+/**
+ * Clean up all the state machines in the sata core.
+ * @return post cleanup action required
+ */
+static int sata_oxnas_cleanup(struct ata_host *ah)
+{
+	struct sata_oxnas_host_priv *hd = ah->private_data;
+	int actions_required = 0;
+	int n;
+
+	printk(KERN_INFO "sata_oxnas: resetting SATA core\n");
+	/* core not recovering, reset it */
+	mdelay(5);
+	sata_oxnas_reset_core(ah);
+	mdelay(5);
+	actions_required |= OXNAS_SATA_REINIT;
+	/* Perform any SATA core re-initialisation after reset post reset init
+	 * needs to be called for both ports as there's one reset for both
+	 * ports */
+	for (n = 0; n < hd->n_ports; n++)
+		sata_oxnas_post_reset_init(ah->ports[n]);
+
+
+	return actions_required;
+}
+
+/**
+ *  ata_qc_new - Request an available ATA command, for queueing
+ *  @ap: Port associated with device @dev
+ *  @return non zero will refuse a new command, zero will may grant on subject
+ *          to conditions elsewhere.
+ *
+ */
+static int sata_oxnas_qc_new(struct ata_port *ap)
+{
+	struct sata_oxnas_host_priv *hd = ap->host->private_data;
+
+	DPRINTK("port %d\n", ap->port_no);
+	smp_rmb();
+	if (hd->port_frozen || hd->port_in_eh)
+		return 1;
+	else
+		return !sata_oxnas_acquire_hw(ap, 0, 0);
+}
+
+/**
+ * releases the lock on the port the command used
+ */
+static void sata_oxnas_qc_free(struct ata_queued_cmd *qc)
+{
+	DPRINTK("\n");
+	sata_oxnas_release_hw(qc->ap);
+}
+
+static void sata_oxnas_freeze(struct ata_port *ap)
+{
+	struct sata_oxnas_host_priv *hd = ap->host->private_data;
+
+	DPRINTK("\n");
+	hd->port_frozen |= BIT(ap->port_no);
+	smp_wmb();
+}
+
+static void sata_oxnas_thaw(struct ata_port *ap)
+{
+	struct sata_oxnas_host_priv *hd = ap->host->private_data;
+
+	DPRINTK("\n");
+	hd->port_frozen &= ~BIT(ap->port_no);
+	smp_wmb();
+}
+
+void sata_oxnas_freeze_host(struct ata_port *ap)
+{
+	struct sata_oxnas_host_priv *hd = ap->host->private_data;
+
+	DPRINTK("ENTER\n");
+	hd->port_in_eh |= BIT(ap->port_no);
+	smp_wmb();
+}
+
+void sata_oxnas_thaw_host(struct ata_port *ap)
+{
+	struct sata_oxnas_host_priv *hd = ap->host->private_data;
+
+	DPRINTK("ENTER\n");
+	hd->port_in_eh &= ~BIT(ap->port_no);
+	smp_wmb();
+}
+
+static void sata_oxnas_post_internal_cmd(struct ata_queued_cmd *qc)
+{
+	DPRINTK("ENTER\n");
+	/* If the core is busy here, make it idle */
+	if (qc->flags & ATA_QCFLAG_FAILED)
+		sata_oxnas_cleanup(qc->ap->host);
+}
+
+
+/**
+ * turn on the interrupts
+ *
+ * @param ap Hardware with the registers in
+ */
+static void sata_oxnas_irq_on(struct ata_port *ap)
+{
+	struct sata_oxnas_port_priv *pd = ap->private_data;
+	u32 mask = (COREINT_END << ap->port_no);
+
+	/* Clear pending interrupts */
+	iowrite32(~0, pd->port_base + INT_CLEAR);
+	iowrite32(mask, pd->core_base + CORE_INT_STATUS);
+	wmb();
+
+	/* enable End of command interrupt */
+	iowrite32(INT_WANT, pd->port_base + INT_ENABLE);
+	iowrite32(mask, pd->core_base + CORE_INT_ENABLE);
+}
+
+
+/** @return true if the port has a cable connected */
+int sata_oxnas_check_link(struct ata_port *ap)
+{
+	int reg;
+
+	sata_oxnas_scr_read_port(ap, SCR_STATUS, &reg);
+	/* Check for the cable present indicated by SCR status bit-0 set */
+	return reg & 0x1;
+}
+
+/**
+ *	ata_std_postreset - standard postreset callback
+ *	@link: the target ata_link
+ *	@classes: classes of attached devices
+ *
+ *	This function is invoked after a successful reset. Note that
+ *	the device might have been reset more than once using
+ *	different reset methods before postreset is invoked.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ */
+static void sata_oxnas_postreset(struct ata_link *link, unsigned int *classes)
+{
+	struct ata_port *ap = link->ap;
+	struct sata_oxnas_host_priv *hd = ap->host->private_data;
+
+	unsigned int dev;
+
+	DPRINTK("ENTER\n");
+	ata_std_postreset(link, classes);
+
+	/* turn on phy error detection by removing the masks */
+	sata_oxnas_link_write(ap->host->ports[0], 0x0c, 0x30003);
+	if (hd->n_ports > 1)
+		sata_oxnas_link_write(ap->host->ports[1], 0x0c, 0x30003);
+
+	/* bail out if no device is present */
+	if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
+		DPRINTK("EXIT, no device\n");
+		return;
+	}
+
+	/* go through all the devices and configure them */
+	for (dev = 0; dev < ATA_MAX_DEVICES; ++dev) {
+		if (ap->link.device[dev].class == ATA_DEV_ATA)
+			sata_oxnas_dev_config(&(ap->link.device[dev]));
+	}
+
+	DPRINTK("EXIT\n");
+}
+
+/**
+ * Called to read the hardware registers / DMA buffers, to
+ * obtain the current set of taskfile register values.
+ * @param ap hardware with the registers in
+ * @param tf taskfile to read the registers into
+ */
+static void sata_oxnas_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
+{
+	struct sata_oxnas_port_priv *port_priv = ap->private_data;
+	void __iomem *port_base = port_priv->port_base;
+	/* read the orb registers */
+	u32 Orb1 = ioread32(port_base + ORB1);
+	u32 Orb2 = ioread32(port_base + ORB2);
+	u32 Orb3 = ioread32(port_base + ORB3);
+	u32 Orb4 = ioread32(port_base + ORB4);
+
+	/* read common 28/48 bit tf parameters */
+	tf->device = (Orb1 >> 24);
+	tf->nsect = (Orb2 >> 0);
+	tf->feature = (Orb2 >> 16);
+	tf->command = sata_oxnas_check_status(ap);
+
+	/* read 48 or 28 bit tf parameters */
+	if (tf->flags & ATA_TFLAG_LBA48) {
+		tf->hob_nsect = (Orb2 >> 8);
+		tf->lbal = (Orb3 >> 0);
+		tf->lbam = (Orb3 >> 8);
+		tf->lbah = (Orb3 >> 16);
+		tf->hob_lbal = (Orb3 >> 24);
+		tf->hob_lbam = (Orb4 >> 0);
+		tf->hob_lbah = (Orb4 >> 8);
+		/* feature ext and control are write only */
+	} else {
+		/* read 28-bit lba */
+		tf->lbal = (Orb3 >> 0);
+		tf->lbam = (Orb3 >> 8);
+		tf->lbah = (Orb3 >> 16);
+	}
+}
+
+/**
+ * Read a result task-file from the sata core registers.
+ */
+static bool sata_oxnas_qc_fill_rtf(struct ata_queued_cmd *qc)
+{
+	/* Read the most recently received FIS from the SATA core ORB registers
+	 and convert to an ATA taskfile */
+	sata_oxnas_tf_read(qc->ap, &qc->result_tf);
+	return true;
+}
+
+/**
+ * Reads the Status ATA shadow register from hardware.
+ *
+ * @return The status register
+ */
+static u8 sata_oxnas_check_status(struct ata_port *ap)
+{
+	u32 Reg;
+	u8 status;
+	struct sata_oxnas_port_priv *port_priv = ap->private_data;
+	void __iomem *port_base = port_priv->port_base;
+
+	/* read byte 3 of Orb2 register */
+	status = ioread32(port_base + ORB2) >> 24;
+
+	/* check for the drive going missing indicated by SCR status bits
+	 * 0-3 = 0 */
+	sata_oxnas_scr_read_port(ap, SCR_STATUS, &Reg);
+
+	if (!(Reg & 0x1)) {
+		status |= ATA_DF;
+		status |= ATA_ERR;
+	}
+
+	return status;
+}
+
+static inline void sata_oxnas_reset_ucode(struct ata_host *ah, int force,
+					  int no_microcode)
+{
+	struct sata_oxnas_host_priv *hd = ah->private_data;
+
+	DPRINTK("ENTER\n");
+	if (no_microcode) {
+		u32 reg;
+
+		sata_oxnas_set_mode(ah, UNKNOWN_MODE, force);
+		reg = ioread32(hd->core_base + DEVICE_CONTROL);
+		reg |= DEVICE_CONTROL_ATA_ERR_OVERRIDE;
+		iowrite32(reg, hd->core_base + DEVICE_CONTROL);
+	} else {
+		/* JBOD uCode */
+		sata_oxnas_set_mode(ah, OXNASSATA_NOTRAID, force);
+		/* Turn the work around off as it may have been left on by any
+		 * HW-RAID code that we've been working with */
+		iowrite32(0x0, hd->core_base + PORT_ERROR_MASK);
+	}
+}
+
+/**
+ * Prepare as much as possible for a command without involving anything that is
+ * shared between ports.
+ */
+static void sata_oxnas_qc_prep(struct ata_queued_cmd *qc)
+{
+	struct sata_oxnas_port_priv *pd;
+	int port_no = qc->ap->port_no;
+
+	/* if the port's not connected, complete now with an error */
+	if (!sata_oxnas_check_link(qc->ap)) {
+		ata_port_err(qc->ap,
+			"port %d not connected completing with error\n",
+			port_no);
+		qc->err_mask |= AC_ERR_ATA_BUS;
+		ata_qc_complete(qc);
+	}
+
+	sata_oxnas_reset_ucode(qc->ap->host, 0, 0);
+
+	/* both pio and dma commands use dma */
+	if (ata_is_dma(qc->tf.protocol) || ata_is_pio(qc->tf.protocol)) {
+
+		/* program the scatterlist into the prd table */
+		ata_bmdma_qc_prep(qc);
+
+		/* point the sgdma controller at the dma request structure */
+		pd = qc->ap->private_data;
+
+		iowrite32(pd->sgdma_request_pa,
+				pd->sgdma_base + SGDMA_REQUESTPTR);
+
+		/* setup the request table */
+		if (port_no == 0) {
+			pd->sgdma_request->control =
+				(qc->dma_dir == DMA_FROM_DEVICE) ?
+					SGDMA_REQCTL0IN : SGDMA_REQCTL0OUT;
+		} else {
+			pd->sgdma_request->control =
+				(qc->dma_dir == DMA_FROM_DEVICE) ?
+					SGDMA_REQCTL1IN : SGDMA_REQCTL1OUT;
+		}
+		pd->sgdma_request->qualifier = SGDMA_REQQUAL;
+		pd->sgdma_request->src_pa = qc->ap->bmdma_prd_dma;
+		pd->sgdma_request->dst_pa = qc->ap->bmdma_prd_dma;
+		smp_wmb();
+
+		/* tell it to wait */
+		iowrite32(SGDMA_CONTROL_NOGO, pd->sgdma_base + SGDMA_CONTROL);
+	}
+}
+
+static int sata_oxnas_port_start(struct ata_port *ap)
+{
+	struct sata_oxnas_host_priv *host_priv = ap->host->private_data;
+	struct device *dev = ap->host->dev;
+	struct sata_oxnas_port_priv *pp;
+	void *mem;
+	dma_addr_t mem_dma;
+
+	DPRINTK("ENTER\n");
+
+	pp = kzalloc(sizeof(*pp), GFP_KERNEL);
+	if (!pp)
+		return -ENOMEM;
+
+	pp->port_base = host_priv->port_base +
+			(ap->port_no ? PORT_SIZE : 0);
+	pp->dmactl_base = host_priv->dmactl_base +
+			 (ap->port_no ? DMA_CORESIZE : 0);
+	pp->sgdma_base = host_priv->sgdma_base +
+			 (ap->port_no ? SGDMA_CORESIZE : 0);
+	pp->core_base = host_priv->core_base;
+
+	/* preallocated */
+	if (host_priv->dma_size >= SATA_OXNAS_DMA_SIZE * host_priv->n_ports) {
+		DPRINTK("using preallocated DMA\n");
+		mem_dma = host_priv->dma_base +
+				(ap->port_no ? SATA_OXNAS_DMA_SIZE : 0);
+		mem = ioremap(mem_dma, SATA_OXNAS_DMA_SIZE);
+	} else {
+		mem = dma_alloc_coherent(dev, SATA_OXNAS_DMA_SIZE, &mem_dma,
+					 GFP_KERNEL);
+	}
+	if (!mem)
+		goto err_ret;
+
+	pp->sgdma_request_pa = mem_dma;
+	pp->sgdma_request = mem;
+
+	ap->bmdma_prd_dma = mem_dma + sizeof(struct sgdma_request);
+	ap->bmdma_prd = mem + sizeof(struct sgdma_request);
+
+	ap->private_data = pp;
+
+	sata_oxnas_post_reset_init(ap);
+
+	return 0;
+
+err_ret:
+	kfree(pp);
+	return -ENOMEM;
+
+}
+
+static void sata_oxnas_port_stop(struct ata_port *ap)
+{
+	struct device *dev = ap->host->dev;
+	struct sata_oxnas_port_priv *pp = ap->private_data;
+	struct sata_oxnas_host_priv *host_priv = ap->host->private_data;
+
+	DPRINTK("ENTER\n");
+	ap->private_data = NULL;
+	if (host_priv->dma_size) {
+		iounmap(pp->sgdma_request);
+	} else {
+		dma_free_coherent(dev, SATA_OXNAS_DMA_SIZE,
+				  pp->sgdma_request, pp->sgdma_request_pa);
+	}
+
+	kfree(pp);
+}
+
+
+static void sata_oxnas_post_reset_init(struct ata_port *ap)
+{
+	uint dev;
+
+	/* force to load u-code only once after reset */
+	sata_oxnas_reset_ucode(ap->host, !ap->port_no, 0);
+
+	/* turn on phy error detection by removing the masks */
+	sata_oxnas_link_write(ap, 0x0C, 0x30003);
+
+	/* enable hotplug event detection */
+	sata_oxnas_scr_write_port(ap, SCR_ERROR, ~0);
+	sata_oxnas_scr_write_port(ap, SERROR_IRQ_MASK, 0x03feffff);
+	sata_oxnas_scr_write_port(ap, SCR_ACTIVE, ~0 & ~(1 << 26) & ~(1 << 16));
+
+	/* enable interrupts for ports */
+	sata_oxnas_irq_on(ap);
+
+	/* go through all the devices and configure them */
+	for (dev = 0; dev < ATA_MAX_DEVICES; ++dev) {
+		if (ap->link.device[dev].class == ATA_DEV_ATA) {
+			sata_std_hardreset(&ap->link, NULL, jiffies + HZ);
+			sata_oxnas_dev_config(&(ap->link.device[dev]));
+		}
+	}
+
+	/* clean up any remaining errors */
+	sata_oxnas_scr_write_port(ap, SCR_ERROR, ~0);
+	VPRINTK("done\n");
+}
+
+/**
+ * host_stop() is called when the rmmod or hot unplug process begins. The
+ * hook must stop all hardware interrupts, DMA engines, etc.
+ *
+ * @param ap hardware with the registers in
+ */
+static void sata_oxnas_host_stop(struct ata_host *host_set)
+{
+	DPRINTK("\n");
+}
+
+
+#define ERROR_HW_ACQUIRE_TIMEOUT_JIFFIES (10 * HZ)
+static void sata_oxnas_error_handler(struct ata_port *ap)
+{
+	DPRINTK("Enter port_no %d\n", ap->port_no);
+	sata_oxnas_freeze_host(ap);
+
+	/* If the core is busy here, make it idle */
+	sata_oxnas_cleanup(ap->host);
+
+	ata_std_error_handler(ap);
+
+	sata_oxnas_thaw_host(ap);
+}
+
+static int sata_oxnas_softreset(struct ata_link *link, unsigned int *class,
+				 unsigned long deadline)
+{
+	struct ata_port *ap = link->ap;
+	struct sata_oxnas_port_priv *pd = ap->private_data;
+	void __iomem *port_base = pd->port_base;
+	int rc;
+
+	struct ata_taskfile tf;
+	u32 Command_Reg;
+
+	DPRINTK("ENTER\n");
+
+	port_base = pd->port_base;
+
+	if (ata_link_offline(link)) {
+		DPRINTK("PHY reports no device\n");
+		*class = ATA_DEV_NONE;
+		goto out;
+	}
+
+	/* write value to register */
+	iowrite32(0, port_base + ORB1);
+	iowrite32(0, port_base + ORB2);
+	iowrite32(0, port_base + ORB3);
+	iowrite32((ap->ctl) << 24, port_base + ORB4);
+
+	/* command the core to send a control FIS */
+	Command_Reg = ioread32(port_base + SATA_COMMAND);
+	Command_Reg &= ~SATA_OPCODE_MASK;
+	Command_Reg |= CMD_WRITE_TO_ORB_REGS_NO_COMMAND;
+	iowrite32(Command_Reg, port_base + SATA_COMMAND);
+	udelay(20);	/* FIXME: flush */
+
+	/* write value to register */
+	iowrite32((ap->ctl | ATA_SRST) << 24, port_base + ORB4);
+
+	/* command the core to send a control FIS */
+	Command_Reg &= ~SATA_OPCODE_MASK;
+	Command_Reg |= CMD_WRITE_TO_ORB_REGS_NO_COMMAND;
+	iowrite32(Command_Reg, port_base + SATA_COMMAND);
+	udelay(20);	/* FIXME: flush */
+
+	/* write value to register */
+	iowrite32((ap->ctl) << 24, port_base + ORB4);
+
+	/* command the core to send a control FIS */
+	Command_Reg &= ~SATA_OPCODE_MASK;
+	Command_Reg |= CMD_WRITE_TO_ORB_REGS_NO_COMMAND;
+	iowrite32(Command_Reg, port_base + SATA_COMMAND);
+
+	msleep(150);
+
+	rc = ata_sff_wait_ready(link, deadline);
+
+	/* if link is occupied, -ENODEV too is an error */
+	if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
+		ata_link_printk(link, KERN_ERR, "SRST failed (errno=%d)\n", rc);
+		return rc;
+	}
+
+	/* determine by signature whether we have ATA or ATAPI devices */
+	sata_oxnas_tf_read(ap, &tf);
+	*class = ata_dev_classify(&tf);
+
+	if (*class == ATA_DEV_UNKNOWN)
+		*class = ATA_DEV_NONE;
+
+out:
+	DPRINTK("EXIT, class=%u\n", *class);
+	return 0;
+}
+
+
+int	sata_oxnas_init_controller(struct ata_host *host)
+{
+	return 0;
+}
+
+/**
+ * Ref bug-6320
+ *
+ * This code is a work around for a DMA hardware bug that will repeat the
+ * penultimate 8-bytes on some reads. This code will check that the amount
+ * of data transferred is a multiple of 512 bytes, if not the in it will
+ * fetch the correct data from a buffer in the SATA core and copy it into
+ * memory.
+ *
+ * @param port SATA port to check and if necessary, correct.
+ */
+static int sata_oxnas_bug_6320_detect(struct ata_port *ap)
+{
+	struct sata_oxnas_port_priv *pd = ap->private_data;
+	void __iomem *core_base = pd->core_base;
+	int is_read;
+	int quads_transferred;
+	int remainder;
+	int sector_quads_remaining;
+	int bug_present = 0;
+
+	/* Only want to apply fix to reads */
+	is_read = !(ioread32(core_base + DM_DBG1) & (ap->port_no ?
+			BIT(CORE_PORT1_DATA_DIR_BIT) :
+				BIT(CORE_PORT0_DATA_DIR_BIT)));
+
+	/* Check for an incomplete transfer, i.e. not a multiple of 512 bytes
+	   transferred (datacount_port register counts quads transferred) */
+	quads_transferred =
+		ioread32(core_base + (ap->port_no ?
+					DATACOUNT_PORT1 : DATACOUNT_PORT0));
+
+	remainder = quads_transferred & 0x7f;
+	sector_quads_remaining = remainder ? (0x80 - remainder) : 0;
+
+	if (is_read && (sector_quads_remaining == 2)) {
+		bug_present = 1;
+	} else if (sector_quads_remaining) {
+		if (is_read) {
+			ata_port_warn(ap, "SATA read fixup cannot deal with "
+				"%d quads remaining\n",
+				sector_quads_remaining);
+		} else {
+			ata_port_warn(ap, "SATA write fixup of %d quads "
+				"remaining not supported\n",
+				sector_quads_remaining);
+		}
+	}
+
+	return bug_present;
+}
+
+/* This port done an interrupt */
+static void sata_oxnas_port_irq(struct ata_port *ap, int force_error)
+{
+	struct ata_queued_cmd *qc;
+	struct sata_oxnas_port_priv *pd = ap->private_data;
+	void __iomem *port_base = pd->port_base;
+
+	u32 int_status;
+	unsigned long flags = 0;
+
+	DPRINTK("ENTER port %d irqstatus %x\n", ap->port_no,
+		ioread32(port_base + INT_STATUS));
+
+	if (ap->qc_active & (1 << ATA_TAG_INTERNAL)) {
+			qc = ata_qc_from_tag(ap, ATA_TAG_INTERNAL);
+			DPRINTK("completing non-ncq cmd\n");
+
+			if (qc)
+				ata_qc_complete(qc);
+
+			return;
+	}
+
+	qc = ata_qc_from_tag(ap, ap->link.active_tag);
+
+
+	/* record the port's interrupt */
+	int_status = ioread32(port_base + INT_STATUS);
+
+	/* If there's no command associated with this IRQ, ignore it. We may get
+	 * spurious interrupts when cleaning-up after a failed command, ignore
+	 * these too. */
+	if (likely(qc)) {
+		/* get the status before any error cleanup */
+		qc->err_mask = ac_err_mask(sata_oxnas_check_status(ap));
+		if (force_error) {
+			/* Pretend there has been a link error */
+			qc->err_mask |= AC_ERR_ATA_BUS;
+			DPRINTK(" ####force error####\n");
+		}
+		/* tell libata we're done */
+		local_irq_save(flags);
+		sata_oxnas_irq_clear(ap);
+		local_irq_restore(flags);
+		ata_qc_complete(qc);
+	} else {
+		VPRINTK("Ignoring interrupt, can't find the command tag="
+			"%d %08x\n", ap->link.active_tag, ap->qc_active);
+	}
+
+	/* maybe a hotplug event */
+	if (unlikely(int_status & INT_LINK_SERROR)) {
+		u32 serror;
+
+		sata_oxnas_scr_read_port(ap, SCR_ERROR, &serror);
+		if (serror & (SERR_DEV_XCHG | SERR_PHYRDY_CHG)) {
+			ata_ehi_hotplugged(&ap->link.eh_info);
+			ata_port_freeze(ap);
+		}
+	}
+}
+
+/**
+ * irq_handler is the interrupt handling routine registered with the system,
+ * by libata.
+ */
+static irqreturn_t sata_oxnas_interrupt(int irq, void *dev_instance)
+{
+	struct ata_host *ah = dev_instance;
+	struct sata_oxnas_host_priv *hd = ah->private_data;
+	void __iomem *core_base = hd->core_base;
+
+	u32 int_status;
+	irqreturn_t ret = IRQ_NONE;
+	u32 port_no;
+	u32 mask;
+	int bug_present;
+
+	/* loop until there are no more interrupts */
+	while ((int_status = (ioread32(core_base + CORE_INT_STATUS)) &
+		(COREINT_END | (COREINT_END << 1)))) {
+
+		/* clear any interrupt */
+		iowrite32(int_status, core_base + CORE_INT_CLEAR);
+
+		/* Only need workaround_bug_6320 for single disk systems as dual
+		 * disk will use uCode which prevents this read underrun problem
+		 * from occurring.
+		 * All single disk systems will use port 0 */
+		for (port_no = 0; port_no < hd->n_ports; ++port_no) {
+			/* check the raw end of command interrupt to see if the
+			 * port is done */
+			mask = (COREINT_END << port_no);
+			if (!(int_status & mask))
+				continue;
+
+			/* this port had an interrupt, clear it */
+			iowrite32(mask, core_base + CORE_INT_CLEAR);
+			/* check for bug 6320 only if no microcode was loaded */
+			bug_present = (hd->current_ucode == UNKNOWN_MODE) &&
+				sata_oxnas_bug_6320_detect(ah->ports[port_no]);
+
+			sata_oxnas_port_irq(ah->ports[port_no],
+						bug_present);
+			ret = IRQ_HANDLED;
+		}
+	}
+
+	return ret;
+}
+
+/*
+ * scsi mid-layer and libata interface structures
+ */
+static struct scsi_host_template sata_oxnas_sht = {
+	ATA_NCQ_SHT("sata_oxnas"),
+	.can_queue = SATA_OXNAS_QUEUE_DEPTH,
+	.sg_tablesize = SATA_OXNAS_MAX_PRD,
+	.dma_boundary = ATA_DMA_BOUNDARY,
+	.unchecked_isa_dma  = 0,
+};
+
+
+static struct ata_port_operations sata_oxnas_ops = {
+	.inherits = &sata_port_ops,
+	.qc_prep = sata_oxnas_qc_prep,
+	.qc_issue = sata_oxnas_qc_issue,
+	.qc_fill_rtf = sata_oxnas_qc_fill_rtf,
+	.qc_new = sata_oxnas_qc_new,
+	.qc_free = sata_oxnas_qc_free,
+
+	.scr_read = sata_oxnas_scr_read,
+	.scr_write = sata_oxnas_scr_write,
+
+	.freeze = sata_oxnas_freeze,
+	.thaw = sata_oxnas_thaw,
+	.softreset = sata_oxnas_softreset,
+	/* .hardreset = sata_oxnas_hardreset, */
+	.postreset = sata_oxnas_postreset,
+	.error_handler = sata_oxnas_error_handler,
+	.post_internal_cmd = sata_oxnas_post_internal_cmd,
+
+	.port_start = sata_oxnas_port_start,
+	.port_stop = sata_oxnas_port_stop,
+
+	.host_stop = sata_oxnas_host_stop,
+	/* .pmp_attach = sata_oxnas_pmp_attach, */
+	/* .pmp_detach = sata_oxnas_pmp_detach, */
+	.sff_check_status = sata_oxnas_check_status,
+	.acquire_hw = sata_oxnas_acquire_hw,
+};
+
+static const struct ata_port_info sata_oxnas_port_info = {
+	.flags = SATA_OXNAS_HOST_FLAGS,
+	.pio_mask = ATA_PIO4,
+	.udma_mask = ATA_UDMA6,
+	.port_ops = &sata_oxnas_ops,
+};
+
+static int sata_oxnas_probe(struct platform_device *ofdev)
+{
+	int retval = -ENXIO;
+	int n_ports = 0;
+	void __iomem *port_base = NULL;
+	void __iomem *dmactl_base = NULL;
+	void __iomem *sgdma_base = NULL;
+	void __iomem *core_base = NULL;
+	void __iomem *phy_base = NULL;
+	struct reset_control *rstc;
+
+	struct resource res = {};
+	struct sata_oxnas_host_priv *host_priv = NULL;
+	int irq = 0;
+	struct ata_host *host = NULL;
+	struct clk *clk = NULL;
+
+	const struct ata_port_info *ppi[] = { &sata_oxnas_port_info, NULL };
+
+	of_property_read_u32(ofdev->dev.of_node, "nr-ports", &n_ports);
+	if (n_ports < 1 || n_ports > SATA_OXNAS_MAX_PORTS)
+		goto error_exit_with_cleanup;
+
+	port_base = of_iomap(ofdev->dev.of_node, 0);
+	if (!port_base)
+		goto error_exit_with_cleanup;
+
+	dmactl_base = of_iomap(ofdev->dev.of_node, 1);
+	if (!dmactl_base)
+		goto error_exit_with_cleanup;
+
+	sgdma_base = of_iomap(ofdev->dev.of_node, 2);
+	if (!sgdma_base)
+		goto error_exit_with_cleanup;
+
+	core_base = of_iomap(ofdev->dev.of_node, 3);
+	if (!core_base)
+		goto error_exit_with_cleanup;
+
+	phy_base = of_iomap(ofdev->dev.of_node, 4);
+	if (!phy_base)
+		goto error_exit_with_cleanup;
+
+	host_priv = devm_kzalloc(&ofdev->dev,
+					sizeof(struct sata_oxnas_host_priv),
+					GFP_KERNEL);
+	if (!host_priv)
+		goto error_exit_with_cleanup;
+
+	host_priv->port_base = port_base;
+	host_priv->dmactl_base = dmactl_base;
+	host_priv->sgdma_base = sgdma_base;
+	host_priv->core_base = core_base;
+	host_priv->phy_base = phy_base;
+	host_priv->n_ports = n_ports;
+	host_priv->current_ucode = UNKNOWN_MODE;
+
+	if (!of_address_to_resource(ofdev->dev.of_node, 5, &res)) {
+		host_priv->dma_base = res.start;
+		host_priv->dma_size = resource_size(&res);
+	}
+
+	irq = irq_of_parse_and_map(ofdev->dev.of_node, 0);
+	if (!irq) {
+		dev_err(&ofdev->dev, "invalid irq from platform\n");
+		goto error_exit_with_cleanup;
+	}
+	host_priv->irq = irq;
+
+	clk = of_clk_get(ofdev->dev.of_node, 0);
+	if (IS_ERR(clk)) {
+		retval = PTR_ERR(clk);
+		clk = NULL;
+		goto error_exit_with_cleanup;
+	}
+	host_priv->clk = clk;
+
+	rstc = devm_reset_control_get(&ofdev->dev, "sata");
+	if (IS_ERR(rstc)) {
+		retval = PTR_ERR(rstc);
+		goto error_exit_with_cleanup;
+	}
+	host_priv->rst_sata = rstc;
+
+	rstc = devm_reset_control_get(&ofdev->dev, "link");
+	if (IS_ERR(rstc)) {
+		retval = PTR_ERR(rstc);
+		goto error_exit_with_cleanup;
+	}
+	host_priv->rst_link = rstc;
+
+	rstc = devm_reset_control_get(&ofdev->dev, "phy");
+	if (IS_ERR(rstc)) {
+		retval = PTR_ERR(rstc);
+		goto error_exit_with_cleanup;
+	}
+	host_priv->rst_phy = rstc;
+
+	/* allocate host structure */
+	host = ata_host_alloc_pinfo(&ofdev->dev, ppi, n_ports);
+
+	if (!host) {
+		retval = -ENOMEM;
+		goto error_exit_with_cleanup;
+	}
+	host->private_data = host_priv;
+	host->iomap = port_base;
+
+	/* initialize core locking and queues */
+	init_waitqueue_head(&host_priv->fast_wait_queue);
+	init_waitqueue_head(&host_priv->scsi_wait_queue);
+	spin_lock_init(&host_priv->phy_lock);
+	spin_lock_init(&host_priv->core_lock);
+	host_priv->core_locked = 0;
+	host_priv->reentrant_port_no = -1;
+	host_priv->hw_lock_count = 0;
+	host_priv->direct_lock_count = 0;
+	host_priv->locker_uid = 0;
+	host_priv->current_locker_type = SATA_UNLOCKED;
+	host_priv->isr_arg = NULL;
+	host_priv->isr_callback = NULL;
+
+	/* initialize host controller */
+	retval = sata_oxnas_init_controller(host);
+	if (retval)
+		goto error_exit_with_cleanup;
+
+	/*
+	 * Now, register with libATA core, this will also initiate the
+	 * device discovery process, invoking our port_start() handler &
+	 * error_handler() to execute a dummy softreset EH session
+	 */
+	ata_host_activate(host, irq, sata_oxnas_interrupt, SATA_OXNAS_IRQ_FLAG,
+			  &sata_oxnas_sht);
+
+	return 0;
+
+error_exit_with_cleanup:
+	if (irq)
+		irq_dispose_mapping(host_priv->irq);
+	if (clk)
+		clk_put(clk);
+	if (host)
+		ata_host_detach(host);
+	if (port_base)
+		iounmap(port_base);
+	if (sgdma_base)
+		iounmap(sgdma_base);
+	if (core_base)
+		iounmap(core_base);
+	if (phy_base)
+		iounmap(phy_base);
+	return retval;
+}
+
+
+static int sata_oxnas_remove(struct platform_device *ofdev)
+{
+	struct ata_host *host = dev_get_drvdata(&ofdev->dev);
+	struct sata_oxnas_host_priv *host_priv = host->private_data;
+
+	ata_host_detach(host);
+
+	irq_dispose_mapping(host_priv->irq);
+	iounmap(host_priv->port_base);
+	iounmap(host_priv->sgdma_base);
+	iounmap(host_priv->core_base);
+
+	/* reset Controller, Link and PHY */
+	reset_control_assert(host_priv->rst_sata);
+	reset_control_assert(host_priv->rst_link);
+	reset_control_assert(host_priv->rst_phy);
+
+	/* Disable the clock to the SATA block */
+	clk_disable_unprepare(host_priv->clk);
+	clk_put(host_priv->clk);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int sata_oxnas_suspend(struct platform_device *op, pm_message_t state)
+{
+	struct ata_host *host = dev_get_drvdata(&op->dev);
+
+	return ata_host_suspend(host, state);
+}
+
+static int sata_oxnas_resume(struct platform_device *op)
+{
+	struct ata_host *host = dev_get_drvdata(&op->dev);
+	int ret;
+
+	ret = sata_oxnas_init_controller(host);
+	if (ret) {
+		dev_err(&op->dev, "Error initializing hardware\n");
+		return ret;
+	}
+	ata_host_resume(host);
+	return 0;
+}
+#endif
+
+
+
+static struct of_device_id oxnas_sata_match[] = {
+	{
+		.compatible = "plxtech,nas782x-sata",
+	},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, oxnas_sata_match);
+
+static struct platform_driver oxnas_sata_driver = {
+	.driver = {
+		.name = "oxnas-sata",
+		.owner = THIS_MODULE,
+		.of_match_table = oxnas_sata_match,
+	},
+	.probe		= sata_oxnas_probe,
+	.remove		= sata_oxnas_remove,
+#ifdef CONFIG_PM
+	.suspend	= sata_oxnas_suspend,
+	.resume		= sata_oxnas_resume,
+#endif
+};
+
+module_platform_driver(oxnas_sata_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.0");
+MODULE_AUTHOR("Oxford Semiconductor Ltd.");
+MODULE_DESCRIPTION("low-level driver for Oxford 934 SATA core");
diff --git a/target/linux/oxnas/files/drivers/pci/host/pcie-oxnas.c b/target/linux/oxnas/files/drivers/pci/host/pcie-oxnas.c
new file mode 100644
index 0000000000..7cf3ad1670
--- /dev/null
+++ b/target/linux/oxnas/files/drivers/pci/host/pcie-oxnas.c
@@ -0,0 +1,946 @@
+/*
+ * PCIe driver for PLX NAS782X SoCs
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/mbus.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/reset.h>
+#include <linux/io.h>
+#include <linux/sizes.h>
+
+#define OXNAS_UART1_BASE	0x44200000
+#define OXNAS_UART1_SIZE	SZ_32
+#define OXNAS_UART1_BASE_VA	0xF0000000
+
+#define OXNAS_UART2_BASE	0x44300000
+#define OXNAS_UART2_SIZE	SZ_32
+
+#define OXNAS_PERCPU_BASE	0x47000000
+#define OXNAS_PERCPU_SIZE	SZ_8K
+#define OXNAS_PERCPU_BASE_VA	0xF0002000
+
+#define OXNAS_SYSCRTL_BASE	0x44E00000
+#define OXNAS_SYSCRTL_SIZE	SZ_4K
+#define OXNAS_SYSCRTL_BASE_VA	0xF0004000
+
+#define OXNAS_SECCRTL_BASE	0x44F00000
+#define OXNAS_SECCRTL_SIZE	SZ_4K
+#define OXNAS_SECCRTL_BASE_VA	0xF0005000
+
+#define OXNAS_RPSA_BASE		0x44400000
+#define OXNAS_RPSA_SIZE		SZ_4K
+#define OXNAS_RPSA_BASE_VA	0xF0006000
+
+#define OXNAS_RPSC_BASE		0x44500000
+#define OXNAS_RPSC_SIZE		SZ_4K
+#define OXNAS_RPSC_BASE_VA	0xF0007000
+
+
+/*
+ * Location of flags and vectors in SRAM for controlling the booting of the
+ * secondary ARM11 processors.
+ */
+
+#define OXNAS_SCU_BASE_VA		OXNAS_PERCPU_BASE_VA
+#define OXNAS_GICN_BASE_VA(n)		(OXNAS_PERCPU_BASE_VA + 0x200 + n*0x100)
+
+#define HOLDINGPEN_CPU			IOMEM(OXNAS_SYSCRTL_BASE_VA + 0xc8)
+#define HOLDINGPEN_LOCATION		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0xc4)
+
+/**
+ * System block reset and clock control
+ */
+#define SYS_CTRL_PCI_STAT		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x20)
+#define SYSCTRL_CLK_STAT		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x24)
+#define SYS_CTRL_CLK_SET_CTRL		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x2C)
+#define SYS_CTRL_CLK_CLR_CTRL		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x30)
+#define SYS_CTRL_RST_SET_CTRL		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x34)
+#define SYS_CTRL_RST_CLR_CTRL		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x38)
+
+#define SYS_CTRL_PLLSYS_CTRL		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x48)
+#define SYS_CTRL_CLK_CTRL		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x64)
+#define SYS_CTRL_PLLSYS_KEY_CTRL	IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x6C)
+#define SYS_CTRL_GMAC_CTRL		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x78)
+#define SYS_CTRL_GMAC_DELAY_CTRL	IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x100)
+
+/* Scratch registers */
+#define SYS_CTRL_SCRATCHWORD0		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0xc4)
+#define SYS_CTRL_SCRATCHWORD1		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0xc8)
+#define SYS_CTRL_SCRATCHWORD2		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0xcc)
+#define SYS_CTRL_SCRATCHWORD3		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0xd0)
+
+#define SYS_CTRL_PLLA_CTRL0		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x1F0)
+#define SYS_CTRL_PLLA_CTRL1		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x1F4)
+#define SYS_CTRL_PLLA_CTRL2		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x1F8)
+#define SYS_CTRL_PLLA_CTRL3		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x1FC)
+
+#define SYS_CTRL_USBHSMPH_CTRL		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x40)
+#define SYS_CTRL_USBHSMPH_STAT		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x44)
+#define SYS_CTRL_REF300_DIV		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0xF8)
+#define SYS_CTRL_USBHSPHY_CTRL		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x84)
+#define SYS_CTRL_USB_CTRL		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x90)
+
+/* pcie */
+#define SYS_CTRL_HCSL_CTRL		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x114)
+
+/* System control multi-function pin function selection */
+#define SYS_CTRL_SECONDARY_SEL		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x14)
+#define SYS_CTRL_TERTIARY_SEL		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x8c)
+#define SYS_CTRL_QUATERNARY_SEL		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x94)
+#define SYS_CTRL_DEBUG_SEL		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0x9c)
+#define SYS_CTRL_ALTERNATIVE_SEL	IOMEM(OXNAS_SYSCRTL_BASE_VA + 0xa4)
+#define SYS_CTRL_PULLUP_SEL		IOMEM(OXNAS_SYSCRTL_BASE_VA + 0xac)
+
+/* Secure control multi-function pin function selection */
+#define SEC_CTRL_SECONDARY_SEL		IOMEM(OXNAS_SECCRTL_BASE_VA + 0x14)
+#define SEC_CTRL_TERTIARY_SEL		IOMEM(OXNAS_SECCRTL_BASE_VA + 0x8c)
+#define SEC_CTRL_QUATERNARY_SEL		IOMEM(OXNAS_SECCRTL_BASE_VA + 0x94)
+#define SEC_CTRL_DEBUG_SEL		IOMEM(OXNAS_SECCRTL_BASE_VA + 0x9c)
+#define SEC_CTRL_ALTERNATIVE_SEL	IOMEM(OXNAS_SECCRTL_BASE_VA + 0xa4)
+#define SEC_CTRL_PULLUP_SEL		IOMEM(OXNAS_SECCRTL_BASE_VA + 0xac)
+
+#define SEC_CTRL_COPRO_CTRL		IOMEM(OXNAS_SECCRTL_BASE_VA + 0x68)
+#define SEC_CTRL_SECURE_CTRL		IOMEM(OXNAS_SECCRTL_BASE_VA + 0x98)
+#define SEC_CTRL_LEON_DEBUG		IOMEM(OXNAS_SECCRTL_BASE_VA + 0xF0)
+#define SEC_CTRL_PLLB_DIV_CTRL		IOMEM(OXNAS_SECCRTL_BASE_VA + 0xF8)
+#define SEC_CTRL_PLLB_CTRL0		IOMEM(OXNAS_SECCRTL_BASE_VA + 0x1F0)
+#define SEC_CTRL_PLLB_CTRL1		IOMEM(OXNAS_SECCRTL_BASE_VA + 0x1F4)
+#define SEC_CTRL_PLLB_CTRL8		IOMEM(OXNAS_SECCRTL_BASE_VA + 0x1F4)
+
+#define RPSA_IRQ_SOFT			IOMEM(OXNAS_RPSA_BASE_VA + 0x10)
+#define RPSA_FIQ_ENABLE			IOMEM(OXNAS_RPSA_BASE_VA + 0x108)
+#define RPSA_FIQ_DISABLE		IOMEM(OXNAS_RPSA_BASE_VA + 0x10C)
+#define RPSA_FIQ_IRQ_TO_FIQ		IOMEM(OXNAS_RPSA_BASE_VA + 0x1FC)
+
+#define RPSC_IRQ_SOFT			IOMEM(OXNAS_RPSC_BASE_VA + 0x10)
+#define RPSC_FIQ_ENABLE			IOMEM(OXNAS_RPSC_BASE_VA + 0x108)
+#define RPSC_FIQ_DISABLE		IOMEM(OXNAS_RPSC_BASE_VA + 0x10C)
+#define RPSC_FIQ_IRQ_TO_FIQ		IOMEM(OXNAS_RPSC_BASE_VA + 0x1FC)
+
+#define RPSA_TIMER2_VAL			IOMEM(OXNAS_RPSA_BASE_VA + 0x224)
+
+#define REF300_DIV_INT_SHIFT		8
+#define REF300_DIV_FRAC_SHIFT		0
+#define REF300_DIV_INT(val)		((val) << REF300_DIV_INT_SHIFT)
+#define REF300_DIV_FRAC(val)		((val) << REF300_DIV_FRAC_SHIFT)
+
+#define USBHSPHY_SUSPENDM_MANUAL_ENABLE		16
+#define USBHSPHY_SUSPENDM_MANUAL_STATE		15
+#define USBHSPHY_ATE_ESET			14
+#define USBHSPHY_TEST_DIN			6
+#define USBHSPHY_TEST_ADD			2
+#define USBHSPHY_TEST_DOUT_SEL			1
+#define USBHSPHY_TEST_CLK			0
+
+#define USB_CTRL_USBAPHY_CKSEL_SHIFT	5
+#define USB_CLK_XTAL0_XTAL1		(0 << USB_CTRL_USBAPHY_CKSEL_SHIFT)
+#define USB_CLK_XTAL0			(1 << USB_CTRL_USBAPHY_CKSEL_SHIFT)
+#define USB_CLK_INTERNAL		(2 << USB_CTRL_USBAPHY_CKSEL_SHIFT)
+
+#define USBAMUX_DEVICE			BIT(4)
+
+#define USBPHY_REFCLKDIV_SHIFT		2
+#define USB_PHY_REF_12MHZ		(0 << USBPHY_REFCLKDIV_SHIFT)
+#define USB_PHY_REF_24MHZ		(1 << USBPHY_REFCLKDIV_SHIFT)
+#define USB_PHY_REF_48MHZ		(2 << USBPHY_REFCLKDIV_SHIFT)
+
+#define USB_CTRL_USB_CKO_SEL_BIT	0
+
+#define USB_INT_CLK_XTAL		0
+#define USB_INT_CLK_REF300		2
+#define USB_INT_CLK_PLLB		3
+
+#define SYS_CTRL_GMAC_CKEN_RX_IN	14
+#define SYS_CTRL_GMAC_CKEN_RXN_OUT	13
+#define SYS_CTRL_GMAC_CKEN_RX_OUT	12
+#define SYS_CTRL_GMAC_CKEN_TX_IN	10
+#define SYS_CTRL_GMAC_CKEN_TXN_OUT	9
+#define SYS_CTRL_GMAC_CKEN_TX_OUT	8
+#define SYS_CTRL_GMAC_RX_SOURCE		7
+#define SYS_CTRL_GMAC_TX_SOURCE		6
+#define SYS_CTRL_GMAC_LOW_TX_SOURCE	4
+#define SYS_CTRL_GMAC_AUTO_TX_SOURCE	3
+#define SYS_CTRL_GMAC_RGMII		2
+#define SYS_CTRL_GMAC_SIMPLE_MUX	1
+#define SYS_CTRL_GMAC_CKEN_GTX		0
+#define SYS_CTRL_GMAC_TX_VARDELAY_SHIFT		0
+#define SYS_CTRL_GMAC_TXN_VARDELAY_SHIFT	8
+#define SYS_CTRL_GMAC_RX_VARDELAY_SHIFT		16
+#define SYS_CTRL_GMAC_RXN_VARDELAY_SHIFT	24
+#define SYS_CTRL_GMAC_TX_VARDELAY(d)	((d)<<SYS_CTRL_GMAC_TX_VARDELAY_SHIFT)
+#define SYS_CTRL_GMAC_TXN_VARDELAY(d)	((d)<<SYS_CTRL_GMAC_TXN_VARDELAY_SHIFT)
+#define SYS_CTRL_GMAC_RX_VARDELAY(d)	((d)<<SYS_CTRL_GMAC_RX_VARDELAY_SHIFT)
+#define SYS_CTRL_GMAC_RXN_VARDELAY(d)	((d)<<SYS_CTRL_GMAC_RXN_VARDELAY_SHIFT)
+
+#define PLLB_BYPASS			1
+#define PLLB_ENSAT			3
+#define PLLB_OUTDIV			4
+#define PLLB_REFDIV			8
+#define PLLB_DIV_INT_SHIFT		8
+#define PLLB_DIV_FRAC_SHIFT		0
+#define PLLB_DIV_INT(val)		((val) << PLLB_DIV_INT_SHIFT)
+#define PLLB_DIV_FRAC(val)		((val) << PLLB_DIV_FRAC_SHIFT)
+
+#define SYS_CTRL_CKCTRL_PCI_DIV_BIT	0
+#define SYS_CTRL_CKCTRL_SLOW_BIT	8
+
+#define SYS_CTRL_UART2_DEQ_EN		0
+#define SYS_CTRL_UART3_DEQ_EN		1
+#define SYS_CTRL_UART3_IQ_EN		2
+#define SYS_CTRL_UART4_IQ_EN		3
+#define SYS_CTRL_UART4_NOT_PCI_MODE	4
+
+#define SYS_CTRL_PCI_CTRL1_PCI_STATIC_RQ_BIT	11
+
+#define PLLA_REFDIV_MASK		0x3F
+#define PLLA_REFDIV_SHIFT		8
+#define PLLA_OUTDIV_MASK		0x7
+#define PLLA_OUTDIV_SHIFT		4
+
+/* bit numbers of clock control register */
+#define SYS_CTRL_CLK_COPRO		0
+#define SYS_CTRL_CLK_DMA		1
+#define SYS_CTRL_CLK_CIPHER		2
+#define SYS_CTRL_CLK_SD			3
+#define SYS_CTRL_CLK_SATA		4
+#define SYS_CTRL_CLK_I2S		5
+#define SYS_CTRL_CLK_USBHS		6
+#define SYS_CTRL_CLK_MACA		7
+#define SYS_CTRL_CLK_MAC		SYS_CTRL_CLK_MACA
+#define SYS_CTRL_CLK_PCIEA		8
+#define SYS_CTRL_CLK_STATIC		9
+#define SYS_CTRL_CLK_MACB		10
+#define SYS_CTRL_CLK_PCIEB		11
+#define SYS_CTRL_CLK_REF600		12
+#define SYS_CTRL_CLK_USBDEV		13
+#define SYS_CTRL_CLK_DDR		14
+#define SYS_CTRL_CLK_DDRPHY		15
+#define SYS_CTRL_CLK_DDRCK		16
+
+
+/* bit numbers of reset control register */
+#define SYS_CTRL_RST_SCU		0
+#define SYS_CTRL_RST_COPRO		1
+#define SYS_CTRL_RST_ARM0		2
+#define SYS_CTRL_RST_ARM1		3
+#define SYS_CTRL_RST_USBHS		4
+#define SYS_CTRL_RST_USBHSPHYA		5
+#define SYS_CTRL_RST_MACA		6
+#define SYS_CTRL_RST_MAC		SYS_CTRL_RST_MACA
+#define SYS_CTRL_RST_PCIEA		7
+#define SYS_CTRL_RST_SGDMA		8
+#define SYS_CTRL_RST_CIPHER		9
+#define SYS_CTRL_RST_DDR		10
+#define SYS_CTRL_RST_SATA		11
+#define SYS_CTRL_RST_SATA_LINK		12
+#define SYS_CTRL_RST_SATA_PHY		13
+#define SYS_CTRL_RST_PCIEPHY		14
+#define SYS_CTRL_RST_STATIC		15
+#define SYS_CTRL_RST_GPIO		16
+#define SYS_CTRL_RST_UART1		17
+#define SYS_CTRL_RST_UART2		18
+#define SYS_CTRL_RST_MISC		19
+#define SYS_CTRL_RST_I2S		20
+#define SYS_CTRL_RST_SD			21
+#define SYS_CTRL_RST_MACB		22
+#define SYS_CTRL_RST_PCIEB		23
+#define SYS_CTRL_RST_VIDEO		24
+#define SYS_CTRL_RST_DDR_PHY		25
+#define SYS_CTRL_RST_USBHSPHYB		26
+#define SYS_CTRL_RST_USBDEV		27
+#define SYS_CTRL_RST_ARMDBG		29
+#define SYS_CTRL_RST_PLLA		30
+#define SYS_CTRL_RST_PLLB		31
+
+static inline void oxnas_register_clear_mask(void __iomem *p, unsigned mask)
+{
+	u32 val = readl_relaxed(p);
+
+	val &= ~mask;
+	writel_relaxed(val, p);
+}
+
+static inline void oxnas_register_set_mask(void __iomem *p, unsigned mask)
+{
+	u32 val = readl_relaxed(p);
+
+	val |= mask;
+	writel_relaxed(val, p);
+}
+
+static inline void oxnas_register_value_mask(void __iomem *p,
+					     unsigned mask, unsigned new_value)
+{
+	/* TODO sanity check mask & new_value = new_value */
+	u32 val = readl_relaxed(p);
+
+	val &= ~mask;
+	val |= new_value;
+	writel_relaxed(val, p);
+}
+
+#define VERSION_ID_MAGIC		0x082510b5
+#define LINK_UP_TIMEOUT_SECONDS		1
+#define NUM_CONTROLLERS			1
+
+enum {
+	PCIE_DEVICE_TYPE_MASK = 0x0F,
+	PCIE_DEVICE_TYPE_ENDPOINT = 0,
+	PCIE_DEVICE_TYPE_LEGACY_ENDPOINT = 1,
+	PCIE_DEVICE_TYPE_ROOT = 4,
+
+	PCIE_LTSSM = BIT(4),
+	PCIE_READY_ENTR_L23 = BIT(9),
+	PCIE_LINK_UP = BIT(11),
+	PCIE_OBTRANS = BIT(12),
+};
+
+enum {
+	HCSL_BIAS_ON = BIT(0),
+	HCSL_PCIE_EN = BIT(1),
+	HCSL_PCIEA_EN = BIT(2),
+	HCSL_PCIEB_EN = BIT(3),
+};
+
+enum {
+	/* pcie phy reg offset */
+	PHY_ADDR = 0,
+	PHY_DATA = 4,
+	/* phy data reg bits */
+	READ_EN = BIT(16),
+	WRITE_EN = BIT(17),
+	CAP_DATA = BIT(18),
+};
+
+/* core config registers */
+enum {
+	PCI_CONFIG_VERSION_DEVICEID = 0,
+	PCI_CONFIG_COMMAND_STATUS = 4,
+};
+
+/* inbound config registers */
+enum {
+	IB_ADDR_XLATE_ENABLE = 0xFC,
+
+	/* bits */
+	ENABLE_IN_ADDR_TRANS = BIT(0),
+};
+
+/* outbound config registers, offset relative to PCIE_POM0_MEM_ADDR */
+enum {
+	PCIE_POM0_MEM_ADDR	= 0,
+	PCIE_POM1_MEM_ADDR	= 4,
+	PCIE_IN0_MEM_ADDR	= 8,
+	PCIE_IN1_MEM_ADDR	= 12,
+	PCIE_IN_IO_ADDR		= 16,
+	PCIE_IN_CFG0_ADDR	= 20,
+	PCIE_IN_CFG1_ADDR	= 24,
+	PCIE_IN_MSG_ADDR	= 28,
+	PCIE_IN0_MEM_LIMIT	= 32,
+	PCIE_IN1_MEM_LIMIT	= 36,
+	PCIE_IN_IO_LIMIT	= 40,
+	PCIE_IN_CFG0_LIMIT	= 44,
+	PCIE_IN_CFG1_LIMIT	= 48,
+	PCIE_IN_MSG_LIMIT	= 52,
+	PCIE_AHB_SLAVE_CTRL	= 56,
+
+	PCIE_SLAVE_BE_SHIFT	= 22,
+};
+
+#define ADDR_VAL(val)	((val) & 0xFFFF)
+#define DATA_VAL(val)	((val) & 0xFFFF)
+
+#define PCIE_SLAVE_BE(val)	((val) << PCIE_SLAVE_BE_SHIFT)
+#define PCIE_SLAVE_BE_MASK	PCIE_SLAVE_BE(0xF)
+
+struct oxnas_pcie_shared {
+	/* seems all access are serialized, no lock required */
+	int refcount;
+};
+
+/* Structure representing one PCIe interfaces */
+struct oxnas_pcie {
+	void __iomem *cfgbase;
+	void __iomem *base;
+	void __iomem *inbound;
+	void __iomem *outbound;
+	void __iomem *pcie_ctrl;
+
+	int haslink;
+	struct platform_device *pdev;
+	struct resource io;
+	struct resource cfg;
+	struct resource pre_mem;	/* prefetchable */
+	struct resource non_mem;	/* non-prefetchable */
+	struct resource busn;		/* max available bus numbers */
+	int card_reset;			/* gpio pin, optional */
+	unsigned hcsl_en;		/* hcsl pci enable bit */
+	struct clk *clk;
+	struct clk *busclk;		/* for pcie bus, actually the PLLB */
+	void *private_data[1];
+	spinlock_t lock;
+};
+
+static struct oxnas_pcie_shared pcie_shared = {
+	.refcount = 0,
+};
+
+static inline struct oxnas_pcie *sys_to_pcie(struct pci_sys_data *sys)
+{
+	return sys->private_data;
+}
+
+
+static inline void set_out_lanes(struct oxnas_pcie *pcie, unsigned lanes)
+{
+	oxnas_register_value_mask(pcie->outbound + PCIE_AHB_SLAVE_CTRL,
+				  PCIE_SLAVE_BE_MASK, PCIE_SLAVE_BE(lanes));
+	wmb();
+}
+
+static int oxnas_pcie_link_up(struct oxnas_pcie *pcie)
+{
+	unsigned long end;
+
+	/* Poll for PCIE link up */
+	end = jiffies + (LINK_UP_TIMEOUT_SECONDS * HZ);
+	while (!time_after(jiffies, end)) {
+		if (readl(pcie->pcie_ctrl) & PCIE_LINK_UP)
+			return 1;
+	}
+	return 0;
+}
+
+static void __init oxnas_pcie_setup_hw(struct oxnas_pcie *pcie)
+{
+	/* We won't have any inbound address translation. This allows PCI
+	 * devices to access anywhere in the AHB address map. Might be regarded
+	 * as a bit dangerous, but let's get things working before we worry
+	 * about that
+	 */
+	oxnas_register_clear_mask(pcie->inbound + IB_ADDR_XLATE_ENABLE,
+				  ENABLE_IN_ADDR_TRANS);
+	wmb();
+
+	/*
+	 * Program outbound translation windows
+	 *
+	 * Outbound window is what is referred to as "PCI client" region in HRM
+	 *
+	 * Could use the larger alternative address space to get >>64M regions
+	 * for graphics cards etc., but will not bother at this point.
+	 *
+	 * IP bug means that AMBA window size must be a power of 2
+	 *
+	 * Set mem0 window for first 16MB of outbound window non-prefetchable
+	 * Set mem1 window for second 16MB of outbound window prefetchable
+	 * Set io window for next 16MB of outbound window
+	 * Set cfg0 for final 1MB of outbound window
+	 *
+	 * Ignore mem1, cfg1 and msg windows for now as no obvious use cases for
+	 * 820 that would need them
+	 *
+	 * Probably ideally want no offset between mem0 window start as seen by
+	 * ARM and as seen on PCI bus and get Linux to assign memory regions to
+	 * PCI devices using the same "PCI client" region start address as seen
+	 * by ARM
+	 */
+
+	/* Set PCIeA mem0 region to be 1st 16MB of the 64MB PCIeA window */
+	writel_relaxed(pcie->non_mem.start, pcie->outbound + PCIE_IN0_MEM_ADDR);
+	writel_relaxed(pcie->non_mem.end, pcie->outbound + PCIE_IN0_MEM_LIMIT);
+	writel_relaxed(pcie->non_mem.start, pcie->outbound + PCIE_POM0_MEM_ADDR);
+
+	/* Set PCIeA mem1 region to be 2nd 16MB of the 64MB PCIeA window */
+	writel_relaxed(pcie->pre_mem.start, pcie->outbound + PCIE_IN1_MEM_ADDR);
+	writel_relaxed(pcie->pre_mem.end, pcie->outbound + PCIE_IN1_MEM_LIMIT);
+	writel_relaxed(pcie->pre_mem.start, pcie->outbound + PCIE_POM1_MEM_ADDR);
+
+	/* Set PCIeA io to be third 16M region of the 64MB PCIeA window*/
+	writel_relaxed(pcie->io.start,	pcie->outbound + PCIE_IN_IO_ADDR);
+	writel_relaxed(pcie->io.end,	pcie->outbound + PCIE_IN_IO_LIMIT);
+
+	/* Set PCIeA cgf0 to be last 16M region of the 64MB PCIeA window*/
+	writel_relaxed(pcie->cfg.start,	pcie->outbound + PCIE_IN_CFG0_ADDR);
+	writel_relaxed(pcie->cfg.end, pcie->outbound + PCIE_IN_CFG0_LIMIT);
+	wmb();
+
+	/* Enable outbound address translation */
+	oxnas_register_set_mask(pcie->pcie_ctrl, PCIE_OBTRANS);
+	wmb();
+
+	/*
+	 * Program PCIe command register for core to:
+	 *  enable memory space
+	 *  enable bus master
+	 *  enable io
+	 */
+	writel_relaxed(7, pcie->base + PCI_CONFIG_COMMAND_STATUS);
+	/* which is which */
+	wmb();
+}
+
+static unsigned oxnas_pcie_cfg_to_offset(
+	struct pci_sys_data *sys,
+	unsigned char bus_number,
+	unsigned int devfn,
+	int where)
+{
+	unsigned int function = PCI_FUNC(devfn);
+	unsigned int slot = PCI_SLOT(devfn);
+	unsigned char bus_number_offset;
+
+	bus_number_offset = bus_number - sys->busnr;
+
+	/*
+	 * We'll assume for now that the offset, function, slot, bus encoding
+	 * should map onto linear, contiguous addresses in PCIe config space,
+	 * albeit that the majority will be unused as only slot 0 is valid for
+	 * any PCIe bus and most devices have only function 0
+	 *
+	 * Could be that PCIe in fact works by not encoding the slot number into
+	 * the config space address as it's known that only slot 0 is valid.
+	 * We'll have to experiment if/when we get a PCIe switch connected to
+	 * the PCIe host
+	 */
+	return (bus_number_offset << 20) | (slot << 15) | (function << 12) |
+		(where & ~3);
+}
+
+/* PCI configuration space write function */
+static int oxnas_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
+			      int where, int size, u32 val)
+{
+	unsigned long flags;
+	struct oxnas_pcie *pcie = sys_to_pcie(bus->sysdata);
+	unsigned offset;
+	u32 value;
+	u32 lanes;
+
+	/* Only a single device per bus for PCIe point-to-point links */
+	if (PCI_SLOT(devfn) > 0)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	if (!pcie->haslink)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	offset = oxnas_pcie_cfg_to_offset(bus->sysdata, bus->number, devfn,
+					  where);
+
+	value = val << (8 * (where & 3));
+	lanes = (0xf >> (4-size)) << (where & 3);
+	/* it race with mem and io write, but the possibility is low, normally
+	 * all config writes happens at driver initialize stage, wont interleave
+	 * with others.
+	 * and many pcie cards use dword (4bytes) access mem/io access only,
+	 * so not bother to copy that ugly work-around now. */
+	spin_lock_irqsave(&pcie->lock, flags);
+	set_out_lanes(pcie, lanes);
+	writel_relaxed(value, pcie->cfgbase + offset);
+	set_out_lanes(pcie, 0xf);
+	spin_unlock_irqrestore(&pcie->lock, flags);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+/* PCI configuration space read function */
+static int oxnas_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
+			      int size, u32 *val)
+{
+	struct oxnas_pcie *pcie = sys_to_pcie(bus->sysdata);
+	unsigned offset;
+	u32 value;
+	u32 left_bytes, right_bytes;
+
+	/* Only a single device per bus for PCIe point-to-point links */
+	if (PCI_SLOT(devfn) > 0) {
+		*val = 0xffffffff;
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	}
+
+	if (!pcie->haslink) {
+		*val = 0xffffffff;
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	}
+
+	offset = oxnas_pcie_cfg_to_offset(bus->sysdata, bus->number, devfn,
+					  where);
+	value = readl_relaxed(pcie->cfgbase + offset);
+	left_bytes = where & 3;
+	right_bytes = 4 - left_bytes - size;
+	value <<= right_bytes * 8;
+	value >>= (left_bytes + right_bytes) * 8;
+	*val = value;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops oxnas_pcie_ops = {
+	.read = oxnas_pcie_rd_conf,
+	.write = oxnas_pcie_wr_conf,
+};
+
+static int __init oxnas_pcie_setup(int nr, struct pci_sys_data *sys)
+{
+	struct oxnas_pcie *pcie = sys_to_pcie(sys);
+
+	pci_add_resource_offset(&sys->resources, &pcie->non_mem, sys->mem_offset);
+	pci_add_resource_offset(&sys->resources, &pcie->pre_mem, sys->mem_offset);
+	pci_add_resource_offset(&sys->resources, &pcie->io, sys->io_offset);
+	pci_add_resource(&sys->resources, &pcie->busn);
+	if (sys->busnr == 0) { /* default one */
+		sys->busnr = pcie->busn.start;
+	}
+	/* do not use devm_ioremap_resource, it does not like cfg resource */
+	pcie->cfgbase = devm_ioremap(&pcie->pdev->dev, pcie->cfg.start,
+				     resource_size(&pcie->cfg));
+	if (!pcie->cfgbase)
+		return -ENOMEM;
+
+	oxnas_pcie_setup_hw(pcie);
+
+	return 1;
+}
+
+static void __init oxnas_pcie_enable(struct device *dev, struct oxnas_pcie *pcie)
+{
+	struct hw_pci hw;
+	int i;
+
+	memset(&hw, 0, sizeof(hw));
+	for (i = 0; i < NUM_CONTROLLERS; i++)
+		pcie->private_data[i] = pcie;
+
+	hw.nr_controllers = NUM_CONTROLLERS;
+/* I think use stack pointer is a bad idea though it is valid in this case */
+	hw.private_data   = pcie->private_data;
+	hw.setup          = oxnas_pcie_setup;
+	hw.map_irq        = of_irq_parse_and_map_pci;
+	hw.ops            = &oxnas_pcie_ops;
+
+	/* pass dev to maintain of tree, interrupt mapping rely on this */
+	pci_common_init_dev(dev, &hw);
+}
+
+void oxnas_pcie_init_shared_hw(struct platform_device *pdev,
+			       void __iomem *phybase)
+{
+	struct reset_control *rstc;
+	int ret;
+
+	/* generate clocks from HCSL buffers, shared parts */
+	writel(HCSL_BIAS_ON|HCSL_PCIE_EN, SYS_CTRL_HCSL_CTRL);
+
+	/* Ensure PCIe PHY is properly reset */
+	rstc = reset_control_get(&pdev->dev, "phy");
+	if (IS_ERR(rstc)) {
+		ret = PTR_ERR(rstc);
+	} else {
+		ret = reset_control_reset(rstc);
+		reset_control_put(rstc);
+	}
+
+	if (ret) {
+		dev_err(&pdev->dev, "phy reset failed %d\n", ret);
+		return;
+	}
+
+	/* Enable PCIe Pre-Emphasis: What these value means? */
+
+	writel(ADDR_VAL(0x0014), phybase + PHY_ADDR);
+	writel(DATA_VAL(0xce10) | CAP_DATA, phybase + PHY_DATA);
+	writel(DATA_VAL(0xce10) | WRITE_EN, phybase + PHY_DATA);
+
+	writel(ADDR_VAL(0x2004), phybase + PHY_ADDR);
+	writel(DATA_VAL(0x82c7) | CAP_DATA, phybase + PHY_DATA);
+	writel(DATA_VAL(0x82c7) | WRITE_EN, phybase + PHY_DATA);
+}
+
+static int oxnas_pcie_shared_init(struct platform_device *pdev)
+{
+	if (++pcie_shared.refcount == 1) {
+		/* we are the first */
+		struct device_node *np = pdev->dev.of_node;
+		void __iomem *phy = of_iomap(np, 2);
+		if (!phy) {
+			--pcie_shared.refcount;
+			return -ENOMEM;
+		}
+		oxnas_pcie_init_shared_hw(pdev, phy);
+		iounmap(phy);
+		return 0;
+	} else {
+		return 0;
+	}
+}
+
+#if 0
+/* maybe we will call it when enter low power state */
+static void oxnas_pcie_shared_deinit(struct platform_device *pdev)
+{
+	if (--pcie_shared.refcount == 0) {
+		/* no cleanup needed */;
+	}
+}
+#endif
+
+static int __init
+oxnas_pcie_map_registers(struct platform_device *pdev,
+			 struct device_node *np,
+			 struct oxnas_pcie *pcie)
+{
+	struct resource regs;
+	int ret = 0;
+	u32 outbound_ctrl_offset;
+	u32 pcie_ctrl_offset;
+
+	/* 2 is reserved for shared phy */
+	ret = of_address_to_resource(np, 0, &regs);
+	if (ret)
+		return -EINVAL;
+	pcie->base = devm_ioremap_resource(&pdev->dev, &regs);
+	if (!pcie->base)
+		return -ENOMEM;
+
+	ret = of_address_to_resource(np, 1, &regs);
+	if (ret)
+		return -EINVAL;
+	pcie->inbound = devm_ioremap_resource(&pdev->dev, &regs);
+	if (!pcie->inbound)
+		return -ENOMEM;
+
+
+	if (of_property_read_u32(np, "plxtech,pcie-outbound-offset",
+				 &outbound_ctrl_offset))
+		return -EINVAL;
+	/* SYSCRTL is shared by too many drivers, so is mapped by board file */
+	pcie->outbound = IOMEM(OXNAS_SYSCRTL_BASE_VA + outbound_ctrl_offset);
+
+	if (of_property_read_u32(np, "plxtech,pcie-ctrl-offset",
+				 &pcie_ctrl_offset))
+		return -EINVAL;
+	pcie->pcie_ctrl = IOMEM(OXNAS_SYSCRTL_BASE_VA + pcie_ctrl_offset);
+
+	return 0;
+}
+
+static int __init oxnas_pcie_init_res(struct platform_device *pdev,
+				      struct oxnas_pcie *pcie,
+				      struct device_node *np)
+{
+	struct of_pci_range range;
+	struct of_pci_range_parser parser;
+	int ret;
+
+	if (of_pci_range_parser_init(&parser, np))
+		return -EINVAL;
+
+	/* Get the I/O and memory ranges from DT */
+	for_each_of_pci_range(&parser, &range) {
+
+		unsigned long restype = range.flags & IORESOURCE_TYPE_BITS;
+		if (restype == IORESOURCE_IO) {
+			of_pci_range_to_resource(&range, np, &pcie->io);
+			pcie->io.name = "I/O";
+		}
+		if (restype == IORESOURCE_MEM) {
+			if (range.flags & IORESOURCE_PREFETCH) {
+				of_pci_range_to_resource(&range, np, &pcie->pre_mem);
+				pcie->pre_mem.name = "PRE MEM";
+			} else {
+				of_pci_range_to_resource(&range, np, &pcie->non_mem);
+				pcie->non_mem.name = "NON MEM";
+			}
+
+		}
+		if (restype == 0)
+			of_pci_range_to_resource(&range, np, &pcie->cfg);
+	}
+
+	/* Get the bus range */
+	ret = of_pci_parse_bus_range(np, &pcie->busn);
+
+	if (ret) {
+		dev_err(&pdev->dev, "failed to parse bus-range property: %d\n",
+			ret);
+		return ret;
+	}
+
+	pcie->card_reset = of_get_gpio(np, 0);
+	if (pcie->card_reset < 0)
+		dev_info(&pdev->dev, "card reset gpio pin not exists\n");
+
+	if (of_property_read_u32(np, "plxtech,pcie-hcsl-bit", &pcie->hcsl_en))
+		return -EINVAL;
+
+	pcie->clk = of_clk_get_by_name(np, "pcie");
+	if (IS_ERR(pcie->clk)) {
+		return PTR_ERR(pcie->clk);
+	}
+
+	pcie->busclk = of_clk_get_by_name(np, "busclk");
+	if (IS_ERR(pcie->busclk)) {
+		clk_put(pcie->clk);
+		return PTR_ERR(pcie->busclk);
+	}
+
+	return 0;
+}
+
+static void oxnas_pcie_init_hw(struct platform_device *pdev,
+			       struct oxnas_pcie *pcie)
+{
+	u32 version_id;
+	int ret;
+
+	clk_prepare_enable(pcie->busclk);
+
+	/* reset PCIe cards use hard-wired gpio pin */
+	if (pcie->card_reset >= 0 &&
+	    !gpio_direction_output(pcie->card_reset, 0)) {
+		wmb();
+		mdelay(10);
+		/* must tri-state the pin to pull it up */
+		gpio_direction_input(pcie->card_reset);
+		wmb();
+		mdelay(100);
+	}
+
+	oxnas_register_set_mask(SYS_CTRL_HCSL_CTRL, BIT(pcie->hcsl_en));
+
+	/* core */
+	ret = device_reset(&pdev->dev);
+	if (ret) {
+		dev_err(&pdev->dev, "core reset failed %d\n", ret);
+		return;
+	}
+
+	/* Start PCIe core clocks */
+	clk_prepare_enable(pcie->clk);
+
+	version_id = readl_relaxed(pcie->base + PCI_CONFIG_VERSION_DEVICEID);
+	dev_info(&pdev->dev, "PCIe version/deviceID 0x%x\n", version_id);
+
+	if (version_id != VERSION_ID_MAGIC) {
+		dev_info(&pdev->dev, "PCIe controller not found\n");
+		pcie->haslink = 0;
+		return;
+	}
+
+	/* allow entry to L23 state */
+	oxnas_register_set_mask(pcie->pcie_ctrl, PCIE_READY_ENTR_L23);
+
+	/* Set PCIe core into RootCore mode */
+	oxnas_register_value_mask(pcie->pcie_ctrl, PCIE_DEVICE_TYPE_MASK,
+				  PCIE_DEVICE_TYPE_ROOT);
+	wmb();
+
+	/* Bring up the PCI core */
+	oxnas_register_set_mask(pcie->pcie_ctrl, PCIE_LTSSM);
+	wmb();
+}
+
+static int __init oxnas_pcie_probe(struct platform_device *pdev)
+{
+	struct oxnas_pcie *pcie;
+	struct device_node *np = pdev->dev.of_node;
+	int ret;
+
+	pcie = devm_kzalloc(&pdev->dev, sizeof(struct oxnas_pcie),
+			    GFP_KERNEL);
+	if (!pcie)
+		return -ENOMEM;
+
+	pcie->pdev = pdev;
+	pcie->haslink = 1;
+	spin_lock_init(&pcie->lock);
+
+	ret = oxnas_pcie_init_res(pdev, pcie, np);
+	if (ret)
+		return ret;
+	if (pcie->card_reset >= 0) {
+		ret = gpio_request_one(pcie->card_reset, GPIOF_DIR_IN,
+				       dev_name(&pdev->dev));
+		if (ret) {
+			dev_err(&pdev->dev, "cannot request gpio pin %d\n",
+				pcie->card_reset);
+			return ret;
+		}
+	}
+
+	ret = oxnas_pcie_map_registers(pdev, np, pcie);
+	if (ret) {
+		dev_err(&pdev->dev, "cannot map registers\n");
+		goto err_free_gpio;
+	}
+
+	ret = oxnas_pcie_shared_init(pdev);
+	if (ret)
+		goto err_free_gpio;
+
+	/* if hw not found, haslink cleared */
+	oxnas_pcie_init_hw(pdev, pcie);
+
+	if (pcie->haslink && oxnas_pcie_link_up(pcie)) {
+		pcie->haslink = 1;
+		dev_info(&pdev->dev, "link up\n");
+	} else {
+		pcie->haslink = 0;
+		dev_info(&pdev->dev, "link down\n");
+	}
+	/* should we register our controller even when pcie->haslink is 0 ? */
+	/* register the controller with framework */
+	oxnas_pcie_enable(&pdev->dev, pcie);
+
+	return 0;
+
+err_free_gpio:
+	if (pcie->card_reset)
+		gpio_free(pcie->card_reset);
+
+	return ret;
+}
+
+static const struct of_device_id oxnas_pcie_of_match_table[] = {
+	{ .compatible = "plxtech,nas782x-pcie", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, oxnas_pcie_of_match_table);
+
+static struct platform_driver oxnas_pcie_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "oxnas-pcie",
+		.of_match_table =
+		   of_match_ptr(oxnas_pcie_of_match_table),
+	},
+};
+
+static int __init oxnas_pcie_init(void)
+{
+	return platform_driver_probe(&oxnas_pcie_driver,
+				     oxnas_pcie_probe);
+}
+
+subsys_initcall(oxnas_pcie_init);
+
+MODULE_AUTHOR("Ma Haijun <mahaijuns@gmail.com>");
+MODULE_DESCRIPTION("NAS782x PCIe driver");
+MODULE_LICENSE("GPLv2");
diff --git a/target/linux/oxnas/files/drivers/usb/host/ehci-oxnas.c b/target/linux/oxnas/files/drivers/usb/host/ehci-oxnas.c
new file mode 100644
index 0000000000..79c4fa3a95
--- /dev/null
+++ b/target/linux/oxnas/files/drivers/usb/host/ehci-oxnas.c
@@ -0,0 +1,368 @@
+/*
+ * drivers/usb/host/ehci-oxnas.c
+ *
+ * Tzachi Perelstein <tzachi@marvell.com>
+ *
+ * This file is licensed under  the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/mfd/syscon.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/dma-mapping.h>
+#include <linux/clk.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+
+#define USBHSMPH_CTRL_REGOFFSET		0x40
+#define USBHSMPH_STAT_REGOFFSET		0x44
+#define REF300_DIV_REGOFFSET		0xF8
+#define USBHSPHY_CTRL_REGOFFSET		0x84
+#define USB_CTRL_REGOFFSET		0x90
+#define PLLB_DIV_CTRL_REGOFFSET		0x1000F8
+#define USBHSPHY_SUSPENDM_MANUAL_ENABLE		16
+#define USBHSPHY_SUSPENDM_MANUAL_STATE		15
+#define USBHSPHY_ATE_ESET			14
+#define USBHSPHY_TEST_DIN			6
+#define USBHSPHY_TEST_ADD			2
+#define USBHSPHY_TEST_DOUT_SEL			1
+#define USBHSPHY_TEST_CLK			0
+
+#define USB_CTRL_USBAPHY_CKSEL_SHIFT	5
+#define USB_CLK_XTAL0_XTAL1		(0 << USB_CTRL_USBAPHY_CKSEL_SHIFT)
+#define USB_CLK_XTAL0			(1 << USB_CTRL_USBAPHY_CKSEL_SHIFT)
+#define USB_CLK_INTERNAL		(2 << USB_CTRL_USBAPHY_CKSEL_SHIFT)
+
+#define USBAMUX_DEVICE			BIT(4)
+
+#define USBPHY_REFCLKDIV_SHIFT		2
+#define USB_PHY_REF_12MHZ		(0 << USBPHY_REFCLKDIV_SHIFT)
+#define USB_PHY_REF_24MHZ		(1 << USBPHY_REFCLKDIV_SHIFT)
+#define USB_PHY_REF_48MHZ		(2 << USBPHY_REFCLKDIV_SHIFT)
+
+#define USB_CTRL_USB_CKO_SEL_BIT	0
+
+#define USB_INT_CLK_XTAL		0
+#define USB_INT_CLK_REF300		2
+#define USB_INT_CLK_PLLB		3
+
+#define REF300_DIV_INT_SHIFT            8
+#define REF300_DIV_FRAC_SHIFT           0
+#define REF300_DIV_INT(val)             ((val) << REF300_DIV_INT_SHIFT)
+#define REF300_DIV_FRAC(val)            ((val) << REF300_DIV_FRAC_SHIFT)
+
+#define PLLB_BYPASS                     1
+#define PLLB_ENSAT                      3
+#define PLLB_OUTDIV                     4
+#define PLLB_REFDIV                     8
+#define PLLB_DIV_INT_SHIFT              8
+#define PLLB_DIV_FRAC_SHIFT             0
+#define PLLB_DIV_INT(val)               ((val) << PLLB_DIV_INT_SHIFT)
+#define PLLB_DIV_FRAC(val)              ((val) << PLLB_DIV_FRAC_SHIFT)
+
+#include "ehci.h"
+
+struct oxnas_hcd {
+	struct clk *clk;
+	struct clk *refsrc;
+	struct clk *phyref;
+	int use_pllb;
+	int use_phya;
+	struct reset_control *rst_host;
+	struct reset_control *rst_phya;
+	struct reset_control *rst_phyb;
+	struct regmap *syscon;
+};
+
+#define DRIVER_DESC "Oxnas On-Chip EHCI Host Controller"
+
+static struct hc_driver __read_mostly oxnas_hc_driver;
+
+static void start_oxnas_usb_ehci(struct oxnas_hcd *oxnas)
+{
+	if (oxnas->use_pllb) {
+		/* enable pllb */
+		clk_prepare_enable(oxnas->refsrc);
+		/* enable ref600 */
+		clk_prepare_enable(oxnas->phyref);
+		/* 600MHz pllb divider for 12MHz */
+		regmap_write_bits(oxnas->syscon, PLLB_DIV_CTRL_REGOFFSET, 0xffff, PLLB_DIV_INT(50) | PLLB_DIV_FRAC(0));
+	} else {
+		/* ref 300 divider for 12MHz */
+		regmap_write_bits(oxnas->syscon, REF300_DIV_REGOFFSET, 0xffff, REF300_DIV_INT(25) | REF300_DIV_FRAC(0));
+	}
+
+	/* Ensure the USB block is properly reset */
+	reset_control_reset(oxnas->rst_host);
+	reset_control_reset(oxnas->rst_phya);
+	reset_control_reset(oxnas->rst_phyb);
+
+	/* Force the high speed clock to be generated all the time, via serial
+	 programming of the USB HS PHY */
+	regmap_write_bits(oxnas->syscon, USBHSPHY_CTRL_REGOFFSET, 0xffff,
+			  (2UL << USBHSPHY_TEST_ADD) |
+			  (0xe0UL << USBHSPHY_TEST_DIN));
+
+	regmap_write_bits(oxnas->syscon, USBHSPHY_CTRL_REGOFFSET, 0xffff,
+			  (1UL << USBHSPHY_TEST_CLK) |
+			  (2UL << USBHSPHY_TEST_ADD) |
+			  (0xe0UL << USBHSPHY_TEST_DIN));
+
+	regmap_write_bits(oxnas->syscon, USBHSPHY_CTRL_REGOFFSET, 0xffff,
+			  (0xfUL << USBHSPHY_TEST_ADD) |
+			  (0xaaUL << USBHSPHY_TEST_DIN));
+
+	regmap_write_bits(oxnas->syscon, USBHSPHY_CTRL_REGOFFSET, 0xffff,
+			  (1UL << USBHSPHY_TEST_CLK) |
+			  (0xfUL << USBHSPHY_TEST_ADD) |
+			  (0xaaUL << USBHSPHY_TEST_DIN));
+
+	if (oxnas->use_pllb) /* use pllb clock */
+		regmap_write_bits(oxnas->syscon, USB_CTRL_REGOFFSET, 0xffff,
+				  USB_CLK_INTERNAL | USB_INT_CLK_PLLB);
+	else /* use ref300 derived clock */
+		regmap_write_bits(oxnas->syscon, USB_CTRL_REGOFFSET, 0xffff,
+				  USB_CLK_INTERNAL | USB_INT_CLK_REF300);
+
+	if (oxnas->use_phya) {
+		/* Configure USB PHYA as a host */
+		regmap_update_bits(oxnas->syscon, USB_CTRL_REGOFFSET, USBAMUX_DEVICE, 0);
+	}
+
+	/* Enable the clock to the USB block */
+	clk_prepare_enable(oxnas->clk);
+}
+
+static void stop_oxnas_usb_ehci(struct oxnas_hcd *oxnas)
+{
+	reset_control_assert(oxnas->rst_host);
+	reset_control_assert(oxnas->rst_phya);
+	reset_control_assert(oxnas->rst_phyb);
+
+	if (oxnas->use_pllb) {
+		clk_disable_unprepare(oxnas->phyref);
+		clk_disable_unprepare(oxnas->refsrc);
+	}
+	clk_disable_unprepare(oxnas->clk);
+}
+
+static int ehci_oxnas_reset(struct usb_hcd *hcd)
+{
+	#define  txttfill_tuning	reserved2[0]
+
+	struct ehci_hcd	*ehci;
+	u32 tmp;
+	int retval = ehci_setup(hcd);
+	if (retval)
+		return retval;
+
+	ehci = hcd_to_ehci(hcd);
+	tmp = ehci_readl(ehci, &ehci->regs->txfill_tuning);
+	tmp &= ~0x00ff0000;
+	tmp |= 0x003f0000; /* set burst pre load count to 0x40 (63 * 4 bytes)  */
+	tmp |= 0x16; /* set sheduler overhead to 22 * 1.267us (HS) or 22 * 6.33us (FS/LS)*/
+	ehci_writel(ehci, tmp,  &ehci->regs->txfill_tuning);
+
+	tmp = ehci_readl(ehci, &ehci->regs->txttfill_tuning);
+	tmp |= 0x2; /* set sheduler overhead to 2 * 6.333us */
+	ehci_writel(ehci, tmp,  &ehci->regs->txttfill_tuning);
+
+	return retval;
+}
+
+static int ehci_oxnas_drv_probe(struct platform_device *ofdev)
+{
+	struct device_node *np = ofdev->dev.of_node;
+	struct usb_hcd *hcd;
+	struct ehci_hcd *ehci;
+	struct resource res;
+	struct oxnas_hcd *oxnas;
+	int irq, err;
+	struct reset_control *rstc;
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	if (!ofdev->dev.dma_mask)
+		ofdev->dev.dma_mask = &ofdev->dev.coherent_dma_mask;
+	if (!ofdev->dev.coherent_dma_mask)
+		ofdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+
+	hcd = usb_create_hcd(&oxnas_hc_driver,	&ofdev->dev,
+					dev_name(&ofdev->dev));
+	if (!hcd)
+		return -ENOMEM;
+
+	err = of_address_to_resource(np, 0, &res);
+	if (err)
+		goto err_res;
+
+	hcd->rsrc_start = res.start;
+	hcd->rsrc_len = resource_size(&res);
+
+	hcd->regs = devm_ioremap_resource(&ofdev->dev, &res);
+	if (IS_ERR(hcd->regs)) {
+		dev_err(&ofdev->dev, "devm_ioremap_resource failed\n");
+		err = PTR_ERR(hcd->regs);
+		goto err_ioremap;
+	}
+
+	oxnas = (struct oxnas_hcd *)hcd_to_ehci(hcd)->priv;
+
+	oxnas->use_pllb = of_property_read_bool(np, "oxsemi,ehci_use_pllb");
+	oxnas->use_phya = of_property_read_bool(np, "oxsemi,ehci_use_phya");
+
+	oxnas->syscon = syscon_regmap_lookup_by_phandle(np, "oxsemi,sys-ctrl");
+	if (IS_ERR(oxnas->syscon)) {
+		err = PTR_ERR(oxnas->syscon);
+		goto err_syscon;
+	}
+
+	oxnas->clk = of_clk_get_by_name(np, "usb");
+	if (IS_ERR(oxnas->clk)) {
+		err = PTR_ERR(oxnas->clk);
+		goto err_clk;
+	}
+
+	if (oxnas->use_pllb) {
+		oxnas->refsrc = of_clk_get_by_name(np, "refsrc");
+		if (IS_ERR(oxnas->refsrc)) {
+			err = PTR_ERR(oxnas->refsrc);
+			goto err_refsrc;
+		}
+		oxnas->phyref = of_clk_get_by_name(np, "phyref");
+		if (IS_ERR(oxnas->refsrc)) {
+			err = PTR_ERR(oxnas->refsrc);
+			goto err_phyref;
+		}
+
+	} else {
+		oxnas->refsrc = NULL;
+		oxnas->phyref = NULL;
+	}
+
+	rstc = devm_reset_control_get(&ofdev->dev, "host");
+	if (IS_ERR(rstc)) {
+		err = PTR_ERR(rstc);
+		goto err_rst;
+	}
+	oxnas->rst_host = rstc;
+
+	rstc = devm_reset_control_get(&ofdev->dev, "phya");
+	if (IS_ERR(rstc)) {
+		err = PTR_ERR(rstc);
+		goto err_rst;
+	}
+	oxnas->rst_phya = rstc;
+
+	rstc = devm_reset_control_get(&ofdev->dev, "phyb");
+	if (IS_ERR(rstc)) {
+		err = PTR_ERR(rstc);
+		goto err_rst;
+	}
+	oxnas->rst_phyb = rstc;
+
+	irq = irq_of_parse_and_map(np, 0);
+	if (!irq) {
+		dev_err(&ofdev->dev, "irq_of_parse_and_map failed\n");
+		err = -EBUSY;
+		goto err_irq;
+	}
+
+	hcd->has_tt = 1;
+	ehci = hcd_to_ehci(hcd);
+	ehci->caps = hcd->regs;
+
+	start_oxnas_usb_ehci(oxnas);
+
+	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
+	if (err)
+		goto err_hcd;
+
+	return 0;
+
+err_hcd:
+	stop_oxnas_usb_ehci(oxnas);
+err_irq:
+err_rst:
+	if (oxnas->phyref)
+		clk_put(oxnas->phyref);
+err_phyref:
+	if (oxnas->refsrc)
+		clk_put(oxnas->refsrc);
+err_refsrc:
+	clk_put(oxnas->clk);
+err_syscon:
+err_clk:
+err_ioremap:
+err_res:
+	usb_put_hcd(hcd);
+
+	return err;
+}
+
+static int ehci_oxnas_drv_remove(struct platform_device *pdev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(pdev);
+	struct oxnas_hcd *oxnas = (struct oxnas_hcd *)hcd_to_ehci(hcd)->priv;
+
+	usb_remove_hcd(hcd);
+	if (oxnas->use_pllb) {
+		clk_disable_unprepare(oxnas->phyref);
+		clk_put(oxnas->phyref);
+		clk_disable_unprepare(oxnas->refsrc);
+		clk_put(oxnas->refsrc);
+	}
+	clk_disable_unprepare(oxnas->clk);
+	usb_put_hcd(hcd);
+
+	return 0;
+}
+
+static const struct of_device_id oxnas_ehci_dt_ids[] = {
+	{ .compatible = "plxtech,nas782x-ehci" },
+	{ /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, oxnas_ehci_dt_ids);
+
+static struct platform_driver ehci_oxnas_driver = {
+	.probe		= ehci_oxnas_drv_probe,
+	.remove		= ehci_oxnas_drv_remove,
+	.shutdown	= usb_hcd_platform_shutdown,
+	.driver.name	= "oxnas-ehci",
+	.driver.of_match_table	= oxnas_ehci_dt_ids,
+};
+
+static const struct ehci_driver_overrides oxnas_overrides __initconst = {
+	.reset = ehci_oxnas_reset,
+	.extra_priv_size = sizeof(struct oxnas_hcd),
+};
+
+static int __init ehci_oxnas_init(void)
+{
+	if (usb_disabled())
+		return -ENODEV;
+
+	ehci_init_driver(&oxnas_hc_driver, &oxnas_overrides);
+	return platform_driver_register(&ehci_oxnas_driver);
+}
+module_init(ehci_oxnas_init);
+
+static void __exit ehci_oxnas_cleanup(void)
+{
+	platform_driver_unregister(&ehci_oxnas_driver);
+}
+module_exit(ehci_oxnas_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_ALIAS("platform:oxnas-ehci");
+MODULE_LICENSE("GPL");