Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1330 insertions, 0 deletions

diff --git a/drivers/ata/sata_dwc_460ex.c b/drivers/ata/sata_dwc_460ex.c
new file mode 100644
index 000000000..464260f66
--- /dev/null
+++ b/drivers/ata/sata_dwc_460ex.c
@@ -0,0 +1,1330 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * drivers/ata/sata_dwc_460ex.c
+ *
+ * Synopsys DesignWare Cores (DWC) SATA host driver
+ *
+ * Author: Mark Miesfeld <mmiesfeld@amcc.com>
+ *
+ * Ported from 2.6.19.2 to 2.6.25/26 by Stefan Roese <sr@denx.de>
+ * Copyright 2008 DENX Software Engineering
+ *
+ * Based on versions provided by AMCC and Synopsys which are:
+ *          Copyright 2006 Applied Micro Circuits Corporation
+ *          COPYRIGHT (C) 2005  SYNOPSYS, INC.  ALL RIGHTS RESERVED
+ */
+
+#ifdef CONFIG_SATA_DWC_DEBUG
+#define DEBUG
+#endif
+
+#ifdef CONFIG_SATA_DWC_VDEBUG
+#define VERBOSE_DEBUG
+#define DEBUG_NCQ
+#endif
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/dmaengine.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
+#include <linux/libata.h>
+#include <linux/slab.h>
+
+#include "libata.h"
+
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_cmnd.h>
+
+/* These two are defined in "libata.h" */
+#undef	DRV_NAME
+#undef	DRV_VERSION
+
+#define DRV_NAME        "sata-dwc"
+#define DRV_VERSION     "1.3"
+
+#define sata_dwc_writel(a, v)	writel_relaxed(v, a)
+#define sata_dwc_readl(a)	readl_relaxed(a)
+
+#ifndef NO_IRQ
+#define NO_IRQ		0
+#endif
+
+#define AHB_DMA_BRST_DFLT	64	/* 16 data items burst length */
+
+enum {
+	SATA_DWC_MAX_PORTS = 1,
+
+	SATA_DWC_SCR_OFFSET = 0x24,
+	SATA_DWC_REG_OFFSET = 0x64,
+};
+
+/* DWC SATA Registers */
+struct sata_dwc_regs {
+	u32 fptagr;		/* 1st party DMA tag */
+	u32 fpbor;		/* 1st party DMA buffer offset */
+	u32 fptcr;		/* 1st party DMA Xfr count */
+	u32 dmacr;		/* DMA Control */
+	u32 dbtsr;		/* DMA Burst Transac size */
+	u32 intpr;		/* Interrupt Pending */
+	u32 intmr;		/* Interrupt Mask */
+	u32 errmr;		/* Error Mask */
+	u32 llcr;		/* Link Layer Control */
+	u32 phycr;		/* PHY Control */
+	u32 physr;		/* PHY Status */
+	u32 rxbistpd;		/* Recvd BIST pattern def register */
+	u32 rxbistpd1;		/* Recvd BIST data dword1 */
+	u32 rxbistpd2;		/* Recvd BIST pattern data dword2 */
+	u32 txbistpd;		/* Trans BIST pattern def register */
+	u32 txbistpd1;		/* Trans BIST data dword1 */
+	u32 txbistpd2;		/* Trans BIST data dword2 */
+	u32 bistcr;		/* BIST Control Register */
+	u32 bistfctr;		/* BIST FIS Count Register */
+	u32 bistsr;		/* BIST Status Register */
+	u32 bistdecr;		/* BIST Dword Error count register */
+	u32 res[15];		/* Reserved locations */
+	u32 testr;		/* Test Register */
+	u32 versionr;		/* Version Register */
+	u32 idr;		/* ID Register */
+	u32 unimpl[192];	/* Unimplemented */
+	u32 dmadr[256];		/* FIFO Locations in DMA Mode */
+};
+
+enum {
+	SCR_SCONTROL_DET_ENABLE	=	0x00000001,
+	SCR_SSTATUS_DET_PRESENT	=	0x00000001,
+	SCR_SERROR_DIAG_X	=	0x04000000,
+/* DWC SATA Register Operations */
+	SATA_DWC_TXFIFO_DEPTH	=	0x01FF,
+	SATA_DWC_RXFIFO_DEPTH	=	0x01FF,
+	SATA_DWC_DMACR_TMOD_TXCHEN =	0x00000004,
+	SATA_DWC_DMACR_TXCHEN	= (0x00000001 | SATA_DWC_DMACR_TMOD_TXCHEN),
+	SATA_DWC_DMACR_RXCHEN	= (0x00000002 | SATA_DWC_DMACR_TMOD_TXCHEN),
+	SATA_DWC_DMACR_TXRXCH_CLEAR =	SATA_DWC_DMACR_TMOD_TXCHEN,
+	SATA_DWC_INTPR_DMAT	=	0x00000001,
+	SATA_DWC_INTPR_NEWFP	=	0x00000002,
+	SATA_DWC_INTPR_PMABRT	=	0x00000004,
+	SATA_DWC_INTPR_ERR	=	0x00000008,
+	SATA_DWC_INTPR_NEWBIST	=	0x00000010,
+	SATA_DWC_INTPR_IPF	=	0x10000000,
+	SATA_DWC_INTMR_DMATM	=	0x00000001,
+	SATA_DWC_INTMR_NEWFPM	=	0x00000002,
+	SATA_DWC_INTMR_PMABRTM	=	0x00000004,
+	SATA_DWC_INTMR_ERRM	=	0x00000008,
+	SATA_DWC_INTMR_NEWBISTM	=	0x00000010,
+	SATA_DWC_LLCR_SCRAMEN	=	0x00000001,
+	SATA_DWC_LLCR_DESCRAMEN	=	0x00000002,
+	SATA_DWC_LLCR_RPDEN	=	0x00000004,
+/* This is all error bits, zero's are reserved fields. */
+	SATA_DWC_SERROR_ERR_BITS =	0x0FFF0F03
+};
+
+#define SATA_DWC_SCR0_SPD_GET(v)	(((v) >> 4) & 0x0000000F)
+#define SATA_DWC_DMACR_TX_CLEAR(v)	(((v) & ~SATA_DWC_DMACR_TXCHEN) |\
+						 SATA_DWC_DMACR_TMOD_TXCHEN)
+#define SATA_DWC_DMACR_RX_CLEAR(v)	(((v) & ~SATA_DWC_DMACR_RXCHEN) |\
+						 SATA_DWC_DMACR_TMOD_TXCHEN)
+#define SATA_DWC_DBTSR_MWR(size)	(((size)/4) & SATA_DWC_TXFIFO_DEPTH)
+#define SATA_DWC_DBTSR_MRD(size)	((((size)/4) & SATA_DWC_RXFIFO_DEPTH)\
+						 << 16)
+struct sata_dwc_device {
+	struct device		*dev;		/* generic device struct */
+	struct ata_probe_ent	*pe;		/* ptr to probe-ent */
+	struct ata_host		*host;
+	struct sata_dwc_regs __iomem *sata_dwc_regs;	/* DW SATA specific */
+	u32			sactive_issued;
+	u32			sactive_queued;
+	struct phy		*phy;
+	phys_addr_t		dmadr;
+#ifdef CONFIG_SATA_DWC_OLD_DMA
+	struct dw_dma_chip	*dma;
+#endif
+};
+
+/*
+ * Allow one extra special slot for commands and DMA management
+ * to account for libata internal commands.
+ */
+#define SATA_DWC_QCMD_MAX	(ATA_MAX_QUEUE + 1)
+
+struct sata_dwc_device_port {
+	struct sata_dwc_device	*hsdev;
+	int			cmd_issued[SATA_DWC_QCMD_MAX];
+	int			dma_pending[SATA_DWC_QCMD_MAX];
+
+	/* DMA info */
+	struct dma_chan			*chan;
+	struct dma_async_tx_descriptor	*desc[SATA_DWC_QCMD_MAX];
+	u32				dma_interrupt_count;
+};
+
+/*
+ * Commonly used DWC SATA driver macros
+ */
+#define HSDEV_FROM_HOST(host)	((struct sata_dwc_device *)(host)->private_data)
+#define HSDEV_FROM_AP(ap)	((struct sata_dwc_device *)(ap)->host->private_data)
+#define HSDEVP_FROM_AP(ap)	((struct sata_dwc_device_port *)(ap)->private_data)
+#define HSDEV_FROM_QC(qc)	((struct sata_dwc_device *)(qc)->ap->host->private_data)
+#define HSDEV_FROM_HSDEVP(p)	((struct sata_dwc_device *)(p)->hsdev)
+
+enum {
+	SATA_DWC_CMD_ISSUED_NOT		= 0,
+	SATA_DWC_CMD_ISSUED_PEND	= 1,
+	SATA_DWC_CMD_ISSUED_EXEC	= 2,
+	SATA_DWC_CMD_ISSUED_NODATA	= 3,
+
+	SATA_DWC_DMA_PENDING_NONE	= 0,
+	SATA_DWC_DMA_PENDING_TX		= 1,
+	SATA_DWC_DMA_PENDING_RX		= 2,
+};
+
+/*
+ * Prototypes
+ */
+static void sata_dwc_bmdma_start_by_tag(struct ata_queued_cmd *qc, u8 tag);
+static int sata_dwc_qc_complete(struct ata_port *ap, struct ata_queued_cmd *qc,
+				u32 check_status);
+static void sata_dwc_dma_xfer_complete(struct ata_port *ap, u32 check_status);
+static void sata_dwc_port_stop(struct ata_port *ap);
+static void sata_dwc_clear_dmacr(struct sata_dwc_device_port *hsdevp, u8 tag);
+
+#ifdef CONFIG_SATA_DWC_OLD_DMA
+
+#include <linux/platform_data/dma-dw.h>
+#include <linux/dma/dw.h>
+
+static struct dw_dma_slave sata_dwc_dma_dws = {
+	.src_id = 0,
+	.dst_id = 0,
+	.m_master = 1,
+	.p_master = 0,
+};
+
+static bool sata_dwc_dma_filter(struct dma_chan *chan, void *param)
+{
+	struct dw_dma_slave *dws = &sata_dwc_dma_dws;
+
+	if (dws->dma_dev != chan->device->dev)
+		return false;
+
+	chan->private = dws;
+	return true;
+}
+
+static int sata_dwc_dma_get_channel_old(struct sata_dwc_device_port *hsdevp)
+{
+	struct sata_dwc_device *hsdev = hsdevp->hsdev;
+	struct dw_dma_slave *dws = &sata_dwc_dma_dws;
+	dma_cap_mask_t mask;
+
+	dws->dma_dev = hsdev->dev;
+
+	dma_cap_zero(mask);
+	dma_cap_set(DMA_SLAVE, mask);
+
+	/* Acquire DMA channel */
+	hsdevp->chan = dma_request_channel(mask, sata_dwc_dma_filter, hsdevp);
+	if (!hsdevp->chan) {
+		dev_err(hsdev->dev, "%s: dma channel unavailable\n",
+			 __func__);
+		return -EAGAIN;
+	}
+
+	return 0;
+}
+
+static int sata_dwc_dma_init_old(struct platform_device *pdev,
+				 struct sata_dwc_device *hsdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct resource *res;
+
+	hsdev->dma = devm_kzalloc(&pdev->dev, sizeof(*hsdev->dma), GFP_KERNEL);
+	if (!hsdev->dma)
+		return -ENOMEM;
+
+	hsdev->dma->dev = &pdev->dev;
+	hsdev->dma->id = pdev->id;
+
+	/* Get SATA DMA interrupt number */
+	hsdev->dma->irq = irq_of_parse_and_map(np, 1);
+	if (hsdev->dma->irq == NO_IRQ) {
+		dev_err(&pdev->dev, "no SATA DMA irq\n");
+		return -ENODEV;
+	}
+
+	/* Get physical SATA DMA register base address */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	hsdev->dma->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(hsdev->dma->regs))
+		return PTR_ERR(hsdev->dma->regs);
+
+	/* Initialize AHB DMAC */
+	return dw_dma_probe(hsdev->dma);
+}
+
+static void sata_dwc_dma_exit_old(struct sata_dwc_device *hsdev)
+{
+	if (!hsdev->dma)
+		return;
+
+	dw_dma_remove(hsdev->dma);
+}
+
+#endif
+
+static const char *get_prot_descript(u8 protocol)
+{
+	switch (protocol) {
+	case ATA_PROT_NODATA:
+		return "ATA no data";
+	case ATA_PROT_PIO:
+		return "ATA PIO";
+	case ATA_PROT_DMA:
+		return "ATA DMA";
+	case ATA_PROT_NCQ:
+		return "ATA NCQ";
+	case ATA_PROT_NCQ_NODATA:
+		return "ATA NCQ no data";
+	case ATAPI_PROT_NODATA:
+		return "ATAPI no data";
+	case ATAPI_PROT_PIO:
+		return "ATAPI PIO";
+	case ATAPI_PROT_DMA:
+		return "ATAPI DMA";
+	default:
+		return "unknown";
+	}
+}
+
+static const char *get_dma_dir_descript(int dma_dir)
+{
+	switch ((enum dma_data_direction)dma_dir) {
+	case DMA_BIDIRECTIONAL:
+		return "bidirectional";
+	case DMA_TO_DEVICE:
+		return "to device";
+	case DMA_FROM_DEVICE:
+		return "from device";
+	default:
+		return "none";
+	}
+}
+
+static void sata_dwc_tf_dump(struct ata_port *ap, struct ata_taskfile *tf)
+{
+	dev_vdbg(ap->dev,
+		"taskfile cmd: 0x%02x protocol: %s flags: 0x%lx device: %x\n",
+		tf->command, get_prot_descript(tf->protocol), tf->flags,
+		tf->device);
+	dev_vdbg(ap->dev,
+		"feature: 0x%02x nsect: 0x%x lbal: 0x%x lbam: 0x%x lbah: 0x%x\n",
+		tf->feature, tf->nsect, tf->lbal, tf->lbam, tf->lbah);
+	dev_vdbg(ap->dev,
+		"hob_feature: 0x%02x hob_nsect: 0x%x hob_lbal: 0x%x hob_lbam: 0x%x hob_lbah: 0x%x\n",
+		tf->hob_feature, tf->hob_nsect, tf->hob_lbal, tf->hob_lbam,
+		tf->hob_lbah);
+}
+
+static void dma_dwc_xfer_done(void *hsdev_instance)
+{
+	unsigned long flags;
+	struct sata_dwc_device *hsdev = hsdev_instance;
+	struct ata_host *host = (struct ata_host *)hsdev->host;
+	struct ata_port *ap;
+	struct sata_dwc_device_port *hsdevp;
+	u8 tag = 0;
+	unsigned int port = 0;
+
+	spin_lock_irqsave(&host->lock, flags);
+	ap = host->ports[port];
+	hsdevp = HSDEVP_FROM_AP(ap);
+	tag = ap->link.active_tag;
+
+	/*
+	 * Each DMA command produces 2 interrupts.  Only
+	 * complete the command after both interrupts have been
+	 * seen. (See sata_dwc_isr())
+	 */
+	hsdevp->dma_interrupt_count++;
+	sata_dwc_clear_dmacr(hsdevp, tag);
+
+	if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_NONE) {
+		dev_err(ap->dev, "DMA not pending tag=0x%02x pending=%d\n",
+			tag, hsdevp->dma_pending[tag]);
+	}
+
+	if ((hsdevp->dma_interrupt_count % 2) == 0)
+		sata_dwc_dma_xfer_complete(ap, 1);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static struct dma_async_tx_descriptor *dma_dwc_xfer_setup(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
+	struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
+	struct dma_slave_config sconf;
+	struct dma_async_tx_descriptor *desc;
+
+	if (qc->dma_dir == DMA_DEV_TO_MEM) {
+		sconf.src_addr = hsdev->dmadr;
+		sconf.device_fc = false;
+	} else {	/* DMA_MEM_TO_DEV */
+		sconf.dst_addr = hsdev->dmadr;
+		sconf.device_fc = false;
+	}
+
+	sconf.direction = qc->dma_dir;
+	sconf.src_maxburst = AHB_DMA_BRST_DFLT / 4;	/* in items */
+	sconf.dst_maxburst = AHB_DMA_BRST_DFLT / 4;	/* in items */
+	sconf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	sconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+
+	dmaengine_slave_config(hsdevp->chan, &sconf);
+
+	/* Convert SG list to linked list of items (LLIs) for AHB DMA */
+	desc = dmaengine_prep_slave_sg(hsdevp->chan, qc->sg, qc->n_elem,
+				       qc->dma_dir,
+				       DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+
+	if (!desc)
+		return NULL;
+
+	desc->callback = dma_dwc_xfer_done;
+	desc->callback_param = hsdev;
+
+	dev_dbg(hsdev->dev, "%s sg: 0x%p, count: %d addr: %pa\n", __func__,
+		qc->sg, qc->n_elem, &hsdev->dmadr);
+
+	return desc;
+}
+
+static int sata_dwc_scr_read(struct ata_link *link, unsigned int scr, u32 *val)
+{
+	if (scr > SCR_NOTIFICATION) {
+		dev_err(link->ap->dev, "%s: Incorrect SCR offset 0x%02x\n",
+			__func__, scr);
+		return -EINVAL;
+	}
+
+	*val = sata_dwc_readl(link->ap->ioaddr.scr_addr + (scr * 4));
+	dev_dbg(link->ap->dev, "%s: id=%d reg=%d val=0x%08x\n", __func__,
+		link->ap->print_id, scr, *val);
+
+	return 0;
+}
+
+static int sata_dwc_scr_write(struct ata_link *link, unsigned int scr, u32 val)
+{
+	dev_dbg(link->ap->dev, "%s: id=%d reg=%d val=0x%08x\n", __func__,
+		link->ap->print_id, scr, val);
+	if (scr > SCR_NOTIFICATION) {
+		dev_err(link->ap->dev, "%s: Incorrect SCR offset 0x%02x\n",
+			 __func__, scr);
+		return -EINVAL;
+	}
+	sata_dwc_writel(link->ap->ioaddr.scr_addr + (scr * 4), val);
+
+	return 0;
+}
+
+static void clear_serror(struct ata_port *ap)
+{
+	u32 val;
+	sata_dwc_scr_read(&ap->link, SCR_ERROR, &val);
+	sata_dwc_scr_write(&ap->link, SCR_ERROR, val);
+}
+
+static void clear_interrupt_bit(struct sata_dwc_device *hsdev, u32 bit)
+{
+	sata_dwc_writel(&hsdev->sata_dwc_regs->intpr,
+			sata_dwc_readl(&hsdev->sata_dwc_regs->intpr));
+}
+
+static u32 qcmd_tag_to_mask(u8 tag)
+{
+	return 0x00000001 << (tag & 0x1f);
+}
+
+/* See ahci.c */
+static void sata_dwc_error_intr(struct ata_port *ap,
+				struct sata_dwc_device *hsdev, uint intpr)
+{
+	struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
+	struct ata_eh_info *ehi = &ap->link.eh_info;
+	unsigned int err_mask = 0, action = 0;
+	struct ata_queued_cmd *qc;
+	u32 serror;
+	u8 status, tag;
+
+	ata_ehi_clear_desc(ehi);
+
+	sata_dwc_scr_read(&ap->link, SCR_ERROR, &serror);
+	status = ap->ops->sff_check_status(ap);
+
+	tag = ap->link.active_tag;
+
+	dev_err(ap->dev,
+		"%s SCR_ERROR=0x%08x intpr=0x%08x status=0x%08x dma_intp=%d pending=%d issued=%d",
+		__func__, serror, intpr, status, hsdevp->dma_interrupt_count,
+		hsdevp->dma_pending[tag], hsdevp->cmd_issued[tag]);
+
+	/* Clear error register and interrupt bit */
+	clear_serror(ap);
+	clear_interrupt_bit(hsdev, SATA_DWC_INTPR_ERR);
+
+	/* This is the only error happening now.  TODO check for exact error */
+
+	err_mask |= AC_ERR_HOST_BUS;
+	action |= ATA_EH_RESET;
+
+	/* Pass this on to EH */
+	ehi->serror |= serror;
+	ehi->action |= action;
+
+	qc = ata_qc_from_tag(ap, tag);
+	if (qc)
+		qc->err_mask |= err_mask;
+	else
+		ehi->err_mask |= err_mask;
+
+	ata_port_abort(ap);
+}
+
+/*
+ * Function : sata_dwc_isr
+ * arguments : irq, void *dev_instance, struct pt_regs *regs
+ * Return value : irqreturn_t - status of IRQ
+ * This Interrupt handler called via port ops registered function.
+ * .irq_handler = sata_dwc_isr
+ */
+static irqreturn_t sata_dwc_isr(int irq, void *dev_instance)
+{
+	struct ata_host *host = (struct ata_host *)dev_instance;
+	struct sata_dwc_device *hsdev = HSDEV_FROM_HOST(host);
+	struct ata_port *ap;
+	struct ata_queued_cmd *qc;
+	unsigned long flags;
+	u8 status, tag;
+	int handled, num_processed, port = 0;
+	uint intpr, sactive, sactive2, tag_mask;
+	struct sata_dwc_device_port *hsdevp;
+	hsdev->sactive_issued = 0;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	/* Read the interrupt register */
+	intpr = sata_dwc_readl(&hsdev->sata_dwc_regs->intpr);
+
+	ap = host->ports[port];
+	hsdevp = HSDEVP_FROM_AP(ap);
+
+	dev_dbg(ap->dev, "%s intpr=0x%08x active_tag=%d\n", __func__, intpr,
+		ap->link.active_tag);
+
+	/* Check for error interrupt */
+	if (intpr & SATA_DWC_INTPR_ERR) {
+		sata_dwc_error_intr(ap, hsdev, intpr);
+		handled = 1;
+		goto DONE;
+	}
+
+	/* Check for DMA SETUP FIS (FP DMA) interrupt */
+	if (intpr & SATA_DWC_INTPR_NEWFP) {
+		clear_interrupt_bit(hsdev, SATA_DWC_INTPR_NEWFP);
+
+		tag = (u8)(sata_dwc_readl(&hsdev->sata_dwc_regs->fptagr));
+		dev_dbg(ap->dev, "%s: NEWFP tag=%d\n", __func__, tag);
+		if (hsdevp->cmd_issued[tag] != SATA_DWC_CMD_ISSUED_PEND)
+			dev_warn(ap->dev, "CMD tag=%d not pending?\n", tag);
+
+		hsdev->sactive_issued |= qcmd_tag_to_mask(tag);
+
+		qc = ata_qc_from_tag(ap, tag);
+		/*
+		 * Start FP DMA for NCQ command.  At this point the tag is the
+		 * active tag.  It is the tag that matches the command about to
+		 * be completed.
+		 */
+		qc->ap->link.active_tag = tag;
+		sata_dwc_bmdma_start_by_tag(qc, tag);
+
+		handled = 1;
+		goto DONE;
+	}
+	sata_dwc_scr_read(&ap->link, SCR_ACTIVE, &sactive);
+	tag_mask = (hsdev->sactive_issued | sactive) ^ sactive;
+
+	/* If no sactive issued and tag_mask is zero then this is not NCQ */
+	if (hsdev->sactive_issued == 0 && tag_mask == 0) {
+		if (ap->link.active_tag == ATA_TAG_POISON)
+			tag = 0;
+		else
+			tag = ap->link.active_tag;
+		qc = ata_qc_from_tag(ap, tag);
+
+		/* DEV interrupt w/ no active qc? */
+		if (unlikely(!qc || (qc->tf.flags & ATA_TFLAG_POLLING))) {
+			dev_err(ap->dev,
+				"%s interrupt with no active qc qc=%p\n",
+				__func__, qc);
+			ap->ops->sff_check_status(ap);
+			handled = 1;
+			goto DONE;
+		}
+		status = ap->ops->sff_check_status(ap);
+
+		qc->ap->link.active_tag = tag;
+		hsdevp->cmd_issued[tag] = SATA_DWC_CMD_ISSUED_NOT;
+
+		if (status & ATA_ERR) {
+			dev_dbg(ap->dev, "interrupt ATA_ERR (0x%x)\n", status);
+			sata_dwc_qc_complete(ap, qc, 1);
+			handled = 1;
+			goto DONE;
+		}
+
+		dev_dbg(ap->dev, "%s non-NCQ cmd interrupt, protocol: %s\n",
+			__func__, get_prot_descript(qc->tf.protocol));
+DRVSTILLBUSY:
+		if (ata_is_dma(qc->tf.protocol)) {
+			/*
+			 * Each DMA transaction produces 2 interrupts. The DMAC
+			 * transfer complete interrupt and the SATA controller
+			 * operation done interrupt. The command should be
+			 * completed only after both interrupts are seen.
+			 */
+			hsdevp->dma_interrupt_count++;
+			if (hsdevp->dma_pending[tag] == \
+					SATA_DWC_DMA_PENDING_NONE) {
+				dev_err(ap->dev,
+					"%s: DMA not pending intpr=0x%08x status=0x%08x pending=%d\n",
+					__func__, intpr, status,
+					hsdevp->dma_pending[tag]);
+			}
+
+			if ((hsdevp->dma_interrupt_count % 2) == 0)
+				sata_dwc_dma_xfer_complete(ap, 1);
+		} else if (ata_is_pio(qc->tf.protocol)) {
+			ata_sff_hsm_move(ap, qc, status, 0);
+			handled = 1;
+			goto DONE;
+		} else {
+			if (unlikely(sata_dwc_qc_complete(ap, qc, 1)))
+				goto DRVSTILLBUSY;
+		}
+
+		handled = 1;
+		goto DONE;
+	}
+
+	/*
+	 * This is a NCQ command. At this point we need to figure out for which
+	 * tags we have gotten a completion interrupt.  One interrupt may serve
+	 * as completion for more than one operation when commands are queued
+	 * (NCQ).  We need to process each completed command.
+	 */
+
+	 /* process completed commands */
+	sata_dwc_scr_read(&ap->link, SCR_ACTIVE, &sactive);
+	tag_mask = (hsdev->sactive_issued | sactive) ^ sactive;
+
+	if (sactive != 0 || hsdev->sactive_issued > 1 || tag_mask > 1) {
+		dev_dbg(ap->dev,
+			"%s NCQ:sactive=0x%08x  sactive_issued=0x%08x tag_mask=0x%08x\n",
+			__func__, sactive, hsdev->sactive_issued, tag_mask);
+	}
+
+	if ((tag_mask | hsdev->sactive_issued) != hsdev->sactive_issued) {
+		dev_warn(ap->dev,
+			 "Bad tag mask?  sactive=0x%08x sactive_issued=0x%08x  tag_mask=0x%08x\n",
+			 sactive, hsdev->sactive_issued, tag_mask);
+	}
+
+	/* read just to clear ... not bad if currently still busy */
+	status = ap->ops->sff_check_status(ap);
+	dev_dbg(ap->dev, "%s ATA status register=0x%x\n", __func__, status);
+
+	tag = 0;
+	num_processed = 0;
+	while (tag_mask) {
+		num_processed++;
+		while (!(tag_mask & 0x00000001)) {
+			tag++;
+			tag_mask <<= 1;
+		}
+
+		tag_mask &= (~0x00000001);
+		qc = ata_qc_from_tag(ap, tag);
+
+		/* To be picked up by completion functions */
+		qc->ap->link.active_tag = tag;
+		hsdevp->cmd_issued[tag] = SATA_DWC_CMD_ISSUED_NOT;
+
+		/* Let libata/scsi layers handle error */
+		if (status & ATA_ERR) {
+			dev_dbg(ap->dev, "%s ATA_ERR (0x%x)\n", __func__,
+				status);
+			sata_dwc_qc_complete(ap, qc, 1);
+			handled = 1;
+			goto DONE;
+		}
+
+		/* Process completed command */
+		dev_dbg(ap->dev, "%s NCQ command, protocol: %s\n", __func__,
+			get_prot_descript(qc->tf.protocol));
+		if (ata_is_dma(qc->tf.protocol)) {
+			hsdevp->dma_interrupt_count++;
+			if (hsdevp->dma_pending[tag] == \
+					SATA_DWC_DMA_PENDING_NONE)
+				dev_warn(ap->dev, "%s: DMA not pending?\n",
+					__func__);
+			if ((hsdevp->dma_interrupt_count % 2) == 0)
+				sata_dwc_dma_xfer_complete(ap, 1);
+		} else {
+			if (unlikely(sata_dwc_qc_complete(ap, qc, 1)))
+				goto STILLBUSY;
+		}
+		continue;
+
+STILLBUSY:
+		ap->stats.idle_irq++;
+		dev_warn(ap->dev, "STILL BUSY IRQ ata%d: irq trap\n",
+			ap->print_id);
+	} /* while tag_mask */
+
+	/*
+	 * Check to see if any commands completed while we were processing our
+	 * initial set of completed commands (read status clears interrupts,
+	 * so we might miss a completed command interrupt if one came in while
+	 * we were processing --we read status as part of processing a completed
+	 * command).
+	 */
+	sata_dwc_scr_read(&ap->link, SCR_ACTIVE, &sactive2);
+	if (sactive2 != sactive) {
+		dev_dbg(ap->dev,
+			"More completed - sactive=0x%x sactive2=0x%x\n",
+			sactive, sactive2);
+	}
+	handled = 1;
+
+DONE:
+	spin_unlock_irqrestore(&host->lock, flags);
+	return IRQ_RETVAL(handled);
+}
+
+static void sata_dwc_clear_dmacr(struct sata_dwc_device_port *hsdevp, u8 tag)
+{
+	struct sata_dwc_device *hsdev = HSDEV_FROM_HSDEVP(hsdevp);
+	u32 dmacr = sata_dwc_readl(&hsdev->sata_dwc_regs->dmacr);
+
+	if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_RX) {
+		dmacr = SATA_DWC_DMACR_RX_CLEAR(dmacr);
+		sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr, dmacr);
+	} else if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_TX) {
+		dmacr = SATA_DWC_DMACR_TX_CLEAR(dmacr);
+		sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr, dmacr);
+	} else {
+		/*
+		 * This should not happen, it indicates the driver is out of
+		 * sync.  If it does happen, clear dmacr anyway.
+		 */
+		dev_err(hsdev->dev,
+			"%s DMA protocol RX and TX DMA not pending tag=0x%02x pending=%d dmacr: 0x%08x\n",
+			__func__, tag, hsdevp->dma_pending[tag], dmacr);
+		sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
+				SATA_DWC_DMACR_TXRXCH_CLEAR);
+	}
+}
+
+static void sata_dwc_dma_xfer_complete(struct ata_port *ap, u32 check_status)
+{
+	struct ata_queued_cmd *qc;
+	struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
+	struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
+	u8 tag = 0;
+
+	tag = ap->link.active_tag;
+	qc = ata_qc_from_tag(ap, tag);
+	if (!qc) {
+		dev_err(ap->dev, "failed to get qc");
+		return;
+	}
+
+#ifdef DEBUG_NCQ
+	if (tag > 0) {
+		dev_info(ap->dev,
+			 "%s tag=%u cmd=0x%02x dma dir=%s proto=%s dmacr=0x%08x\n",
+			 __func__, qc->hw_tag, qc->tf.command,
+			 get_dma_dir_descript(qc->dma_dir),
+			 get_prot_descript(qc->tf.protocol),
+			 sata_dwc_readl(&hsdev->sata_dwc_regs->dmacr));
+	}
+#endif
+
+	if (ata_is_dma(qc->tf.protocol)) {
+		if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_NONE) {
+			dev_err(ap->dev,
+				"%s DMA protocol RX and TX DMA not pending dmacr: 0x%08x\n",
+				__func__,
+				sata_dwc_readl(&hsdev->sata_dwc_regs->dmacr));
+		}
+
+		hsdevp->dma_pending[tag] = SATA_DWC_DMA_PENDING_NONE;
+		sata_dwc_qc_complete(ap, qc, check_status);
+		ap->link.active_tag = ATA_TAG_POISON;
+	} else {
+		sata_dwc_qc_complete(ap, qc, check_status);
+	}
+}
+
+static int sata_dwc_qc_complete(struct ata_port *ap, struct ata_queued_cmd *qc,
+				u32 check_status)
+{
+	u8 status = 0;
+	u32 mask = 0x0;
+	u8 tag = qc->hw_tag;
+	struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
+	struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
+	hsdev->sactive_queued = 0;
+	dev_dbg(ap->dev, "%s checkstatus? %x\n", __func__, check_status);
+
+	if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_TX)
+		dev_err(ap->dev, "TX DMA PENDING\n");
+	else if (hsdevp->dma_pending[tag] == SATA_DWC_DMA_PENDING_RX)
+		dev_err(ap->dev, "RX DMA PENDING\n");
+	dev_dbg(ap->dev,
+		"QC complete cmd=0x%02x status=0x%02x ata%u: protocol=%d\n",
+		qc->tf.command, status, ap->print_id, qc->tf.protocol);
+
+	/* clear active bit */
+	mask = (~(qcmd_tag_to_mask(tag)));
+	hsdev->sactive_queued = hsdev->sactive_queued & mask;
+	hsdev->sactive_issued = hsdev->sactive_issued & mask;
+	ata_qc_complete(qc);
+	return 0;
+}
+
+static void sata_dwc_enable_interrupts(struct sata_dwc_device *hsdev)
+{
+	/* Enable selective interrupts by setting the interrupt maskregister*/
+	sata_dwc_writel(&hsdev->sata_dwc_regs->intmr,
+			SATA_DWC_INTMR_ERRM |
+			SATA_DWC_INTMR_NEWFPM |
+			SATA_DWC_INTMR_PMABRTM |
+			SATA_DWC_INTMR_DMATM);
+	/*
+	 * Unmask the error bits that should trigger an error interrupt by
+	 * setting the error mask register.
+	 */
+	sata_dwc_writel(&hsdev->sata_dwc_regs->errmr, SATA_DWC_SERROR_ERR_BITS);
+
+	dev_dbg(hsdev->dev, "%s: INTMR = 0x%08x, ERRMR = 0x%08x\n",
+		 __func__, sata_dwc_readl(&hsdev->sata_dwc_regs->intmr),
+		sata_dwc_readl(&hsdev->sata_dwc_regs->errmr));
+}
+
+static void sata_dwc_setup_port(struct ata_ioports *port, void __iomem *base)
+{
+	port->cmd_addr		= base + 0x00;
+	port->data_addr		= base + 0x00;
+
+	port->error_addr	= base + 0x04;
+	port->feature_addr	= base + 0x04;
+
+	port->nsect_addr	= base + 0x08;
+
+	port->lbal_addr		= base + 0x0c;
+	port->lbam_addr		= base + 0x10;
+	port->lbah_addr		= base + 0x14;
+
+	port->device_addr	= base + 0x18;
+	port->command_addr	= base + 0x1c;
+	port->status_addr	= base + 0x1c;
+
+	port->altstatus_addr	= base + 0x20;
+	port->ctl_addr		= base + 0x20;
+}
+
+static int sata_dwc_dma_get_channel(struct sata_dwc_device_port *hsdevp)
+{
+	struct sata_dwc_device *hsdev = hsdevp->hsdev;
+	struct device *dev = hsdev->dev;
+
+#ifdef CONFIG_SATA_DWC_OLD_DMA
+	if (!of_find_property(dev->of_node, "dmas", NULL))
+		return sata_dwc_dma_get_channel_old(hsdevp);
+#endif
+
+	hsdevp->chan = dma_request_chan(dev, "sata-dma");
+	if (IS_ERR(hsdevp->chan)) {
+		dev_err(dev, "failed to allocate dma channel: %ld\n",
+			PTR_ERR(hsdevp->chan));
+		return PTR_ERR(hsdevp->chan);
+	}
+
+	return 0;
+}
+
+/*
+ * Function : sata_dwc_port_start
+ * arguments : struct ata_ioports *port
+ * Return value : returns 0 if success, error code otherwise
+ * This function allocates the scatter gather LLI table for AHB DMA
+ */
+static int sata_dwc_port_start(struct ata_port *ap)
+{
+	int err = 0;
+	struct sata_dwc_device *hsdev;
+	struct sata_dwc_device_port *hsdevp = NULL;
+	struct device *pdev;
+	int i;
+
+	hsdev = HSDEV_FROM_AP(ap);
+
+	dev_dbg(ap->dev, "%s: port_no=%d\n", __func__, ap->port_no);
+
+	hsdev->host = ap->host;
+	pdev = ap->host->dev;
+	if (!pdev) {
+		dev_err(ap->dev, "%s: no ap->host->dev\n", __func__);
+		err = -ENODEV;
+		goto CLEANUP;
+	}
+
+	/* Allocate Port Struct */
+	hsdevp = kzalloc(sizeof(*hsdevp), GFP_KERNEL);
+	if (!hsdevp) {
+		err = -ENOMEM;
+		goto CLEANUP;
+	}
+	hsdevp->hsdev = hsdev;
+
+	err = sata_dwc_dma_get_channel(hsdevp);
+	if (err)
+		goto CLEANUP_ALLOC;
+
+	err = phy_power_on(hsdev->phy);
+	if (err)
+		goto CLEANUP_ALLOC;
+
+	for (i = 0; i < SATA_DWC_QCMD_MAX; i++)
+		hsdevp->cmd_issued[i] = SATA_DWC_CMD_ISSUED_NOT;
+
+	ap->bmdma_prd = NULL;	/* set these so libata doesn't use them */
+	ap->bmdma_prd_dma = 0;
+
+	if (ap->port_no == 0)  {
+		dev_dbg(ap->dev, "%s: clearing TXCHEN, RXCHEN in DMAC\n",
+			__func__);
+		sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
+				SATA_DWC_DMACR_TXRXCH_CLEAR);
+
+		dev_dbg(ap->dev, "%s: setting burst size in DBTSR\n",
+			 __func__);
+		sata_dwc_writel(&hsdev->sata_dwc_regs->dbtsr,
+				(SATA_DWC_DBTSR_MWR(AHB_DMA_BRST_DFLT) |
+				 SATA_DWC_DBTSR_MRD(AHB_DMA_BRST_DFLT)));
+	}
+
+	/* Clear any error bits before libata starts issuing commands */
+	clear_serror(ap);
+	ap->private_data = hsdevp;
+	dev_dbg(ap->dev, "%s: done\n", __func__);
+	return 0;
+
+CLEANUP_ALLOC:
+	kfree(hsdevp);
+CLEANUP:
+	dev_dbg(ap->dev, "%s: fail. ap->id = %d\n", __func__, ap->print_id);
+	return err;
+}
+
+static void sata_dwc_port_stop(struct ata_port *ap)
+{
+	struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
+	struct sata_dwc_device *hsdev = HSDEV_FROM_AP(ap);
+
+	dev_dbg(ap->dev, "%s: ap->id = %d\n", __func__, ap->print_id);
+
+	dmaengine_terminate_sync(hsdevp->chan);
+	dma_release_channel(hsdevp->chan);
+	phy_power_off(hsdev->phy);
+
+	kfree(hsdevp);
+	ap->private_data = NULL;
+}
+
+/*
+ * Function : sata_dwc_exec_command_by_tag
+ * arguments : ata_port *ap, ata_taskfile *tf, u8 tag, u32 cmd_issued
+ * Return value : None
+ * This function keeps track of individual command tag ids and calls
+ * ata_exec_command in libata
+ */
+static void sata_dwc_exec_command_by_tag(struct ata_port *ap,
+					 struct ata_taskfile *tf,
+					 u8 tag, u32 cmd_issued)
+{
+	struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
+
+	dev_dbg(ap->dev, "%s cmd(0x%02x): %s tag=%d\n", __func__, tf->command,
+		ata_get_cmd_descript(tf->command), tag);
+
+	hsdevp->cmd_issued[tag] = cmd_issued;
+
+	/*
+	 * Clear SError before executing a new command.
+	 * sata_dwc_scr_write and read can not be used here. Clearing the PM
+	 * managed SError register for the disk needs to be done before the
+	 * task file is loaded.
+	 */
+	clear_serror(ap);
+	ata_sff_exec_command(ap, tf);
+}
+
+static void sata_dwc_bmdma_setup_by_tag(struct ata_queued_cmd *qc, u8 tag)
+{
+	sata_dwc_exec_command_by_tag(qc->ap, &qc->tf, tag,
+				     SATA_DWC_CMD_ISSUED_PEND);
+}
+
+static void sata_dwc_bmdma_setup(struct ata_queued_cmd *qc)
+{
+	u8 tag = qc->hw_tag;
+
+	if (ata_is_ncq(qc->tf.protocol)) {
+		dev_dbg(qc->ap->dev, "%s: ap->link.sactive=0x%08x tag=%d\n",
+			__func__, qc->ap->link.sactive, tag);
+	} else {
+		tag = 0;
+	}
+	sata_dwc_bmdma_setup_by_tag(qc, tag);
+}
+
+static void sata_dwc_bmdma_start_by_tag(struct ata_queued_cmd *qc, u8 tag)
+{
+	int start_dma;
+	u32 reg;
+	struct sata_dwc_device *hsdev = HSDEV_FROM_QC(qc);
+	struct ata_port *ap = qc->ap;
+	struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
+	struct dma_async_tx_descriptor *desc = hsdevp->desc[tag];
+	int dir = qc->dma_dir;
+
+	if (hsdevp->cmd_issued[tag] != SATA_DWC_CMD_ISSUED_NOT) {
+		start_dma = 1;
+		if (dir == DMA_TO_DEVICE)
+			hsdevp->dma_pending[tag] = SATA_DWC_DMA_PENDING_TX;
+		else
+			hsdevp->dma_pending[tag] = SATA_DWC_DMA_PENDING_RX;
+	} else {
+		dev_err(ap->dev,
+			"%s: Command not pending cmd_issued=%d (tag=%d) DMA NOT started\n",
+			__func__, hsdevp->cmd_issued[tag], tag);
+		start_dma = 0;
+	}
+
+	dev_dbg(ap->dev,
+		"%s qc=%p tag: %x cmd: 0x%02x dma_dir: %s start_dma? %x\n",
+		__func__, qc, tag, qc->tf.command,
+		get_dma_dir_descript(qc->dma_dir), start_dma);
+	sata_dwc_tf_dump(ap, &qc->tf);
+
+	if (start_dma) {
+		sata_dwc_scr_read(&ap->link, SCR_ERROR, &reg);
+		if (reg & SATA_DWC_SERROR_ERR_BITS) {
+			dev_err(ap->dev, "%s: ****** SError=0x%08x ******\n",
+				__func__, reg);
+		}
+
+		if (dir == DMA_TO_DEVICE)
+			sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
+					SATA_DWC_DMACR_TXCHEN);
+		else
+			sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
+					SATA_DWC_DMACR_RXCHEN);
+
+		/* Enable AHB DMA transfer on the specified channel */
+		dmaengine_submit(desc);
+		dma_async_issue_pending(hsdevp->chan);
+	}
+}
+
+static void sata_dwc_bmdma_start(struct ata_queued_cmd *qc)
+{
+	u8 tag = qc->hw_tag;
+
+	if (ata_is_ncq(qc->tf.protocol)) {
+		dev_dbg(qc->ap->dev, "%s: ap->link.sactive=0x%08x tag=%d\n",
+			__func__, qc->ap->link.sactive, tag);
+	} else {
+		tag = 0;
+	}
+	dev_dbg(qc->ap->dev, "%s\n", __func__);
+	sata_dwc_bmdma_start_by_tag(qc, tag);
+}
+
+static unsigned int sata_dwc_qc_issue(struct ata_queued_cmd *qc)
+{
+	u32 sactive;
+	u8 tag = qc->hw_tag;
+	struct ata_port *ap = qc->ap;
+	struct sata_dwc_device_port *hsdevp = HSDEVP_FROM_AP(ap);
+
+#ifdef DEBUG_NCQ
+	if (qc->hw_tag > 0 || ap->link.sactive > 1)
+		dev_info(ap->dev,
+			 "%s ap id=%d cmd(0x%02x)=%s qc tag=%d prot=%s ap active_tag=0x%08x ap sactive=0x%08x\n",
+			 __func__, ap->print_id, qc->tf.command,
+			 ata_get_cmd_descript(qc->tf.command),
+			 qc->hw_tag, get_prot_descript(qc->tf.protocol),
+			 ap->link.active_tag, ap->link.sactive);
+#endif
+
+	if (!ata_is_ncq(qc->tf.protocol))
+		tag = 0;
+
+	if (ata_is_dma(qc->tf.protocol)) {
+		hsdevp->desc[tag] = dma_dwc_xfer_setup(qc);
+		if (!hsdevp->desc[tag])
+			return AC_ERR_SYSTEM;
+	} else {
+		hsdevp->desc[tag] = NULL;
+	}
+
+	if (ata_is_ncq(qc->tf.protocol)) {
+		sata_dwc_scr_read(&ap->link, SCR_ACTIVE, &sactive);
+		sactive |= (0x00000001 << tag);
+		sata_dwc_scr_write(&ap->link, SCR_ACTIVE, sactive);
+
+		dev_dbg(qc->ap->dev,
+			"%s: tag=%d ap->link.sactive = 0x%08x sactive=0x%08x\n",
+			__func__, tag, qc->ap->link.sactive, sactive);
+
+		ap->ops->sff_tf_load(ap, &qc->tf);
+		sata_dwc_exec_command_by_tag(ap, &qc->tf, tag,
+					     SATA_DWC_CMD_ISSUED_PEND);
+	} else {
+		return ata_bmdma_qc_issue(qc);
+	}
+	return 0;
+}
+
+static void sata_dwc_error_handler(struct ata_port *ap)
+{
+	ata_sff_error_handler(ap);
+}
+
+static int sata_dwc_hardreset(struct ata_link *link, unsigned int *class,
+			      unsigned long deadline)
+{
+	struct sata_dwc_device *hsdev = HSDEV_FROM_AP(link->ap);
+	int ret;
+
+	ret = sata_sff_hardreset(link, class, deadline);
+
+	sata_dwc_enable_interrupts(hsdev);
+
+	/* Reconfigure the DMA control register */
+	sata_dwc_writel(&hsdev->sata_dwc_regs->dmacr,
+			SATA_DWC_DMACR_TXRXCH_CLEAR);
+
+	/* Reconfigure the DMA Burst Transaction Size register */
+	sata_dwc_writel(&hsdev->sata_dwc_regs->dbtsr,
+			SATA_DWC_DBTSR_MWR(AHB_DMA_BRST_DFLT) |
+			SATA_DWC_DBTSR_MRD(AHB_DMA_BRST_DFLT));
+
+	return ret;
+}
+
+static void sata_dwc_dev_select(struct ata_port *ap, unsigned int device)
+{
+	/* SATA DWC is master only */
+}
+
+/*
+ * scsi mid-layer and libata interface structures
+ */
+static struct scsi_host_template sata_dwc_sht = {
+	ATA_NCQ_SHT(DRV_NAME),
+	/*
+	 * test-only: Currently this driver doesn't handle NCQ
+	 * correctly. We enable NCQ but set the queue depth to a
+	 * max of 1. This will get fixed in in a future release.
+	 */
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	/* .can_queue		= ATA_MAX_QUEUE, */
+	/*
+	 * Make sure a LLI block is not created that will span 8K max FIS
+	 * boundary. If the block spans such a FIS boundary, there is a chance
+	 * that a DMA burst will cross that boundary -- this results in an
+	 * error in the host controller.
+	 */
+	.dma_boundary		= 0x1fff /* ATA_DMA_BOUNDARY */,
+};
+
+static struct ata_port_operations sata_dwc_ops = {
+	.inherits		= &ata_sff_port_ops,
+
+	.error_handler		= sata_dwc_error_handler,
+	.hardreset		= sata_dwc_hardreset,
+
+	.qc_issue		= sata_dwc_qc_issue,
+
+	.scr_read		= sata_dwc_scr_read,
+	.scr_write		= sata_dwc_scr_write,
+
+	.port_start		= sata_dwc_port_start,
+	.port_stop		= sata_dwc_port_stop,
+
+	.sff_dev_select		= sata_dwc_dev_select,
+
+	.bmdma_setup		= sata_dwc_bmdma_setup,
+	.bmdma_start		= sata_dwc_bmdma_start,
+};
+
+static const struct ata_port_info sata_dwc_port_info[] = {
+	{
+		.flags		= ATA_FLAG_SATA | ATA_FLAG_NCQ,
+		.pio_mask	= ATA_PIO4,
+		.udma_mask	= ATA_UDMA6,
+		.port_ops	= &sata_dwc_ops,
+	},
+};
+
+static int sata_dwc_probe(struct platform_device *ofdev)
+{
+	struct sata_dwc_device *hsdev;
+	u32 idr, versionr;
+	char *ver = (char *)&versionr;
+	void __iomem *base;
+	int err = 0;
+	int irq;
+	struct ata_host *host;
+	struct ata_port_info pi = sata_dwc_port_info[0];
+	const struct ata_port_info *ppi[] = { &pi, NULL };
+	struct device_node *np = ofdev->dev.of_node;
+	struct resource *res;
+
+	/* Allocate DWC SATA device */
+	host = ata_host_alloc_pinfo(&ofdev->dev, ppi, SATA_DWC_MAX_PORTS);
+	hsdev = devm_kzalloc(&ofdev->dev, sizeof(*hsdev), GFP_KERNEL);
+	if (!host || !hsdev)
+		return -ENOMEM;
+
+	host->private_data = hsdev;
+
+	/* Ioremap SATA registers */
+	res = platform_get_resource(ofdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(&ofdev->dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+	dev_dbg(&ofdev->dev, "ioremap done for SATA register address\n");
+
+	/* Synopsys DWC SATA specific Registers */
+	hsdev->sata_dwc_regs = base + SATA_DWC_REG_OFFSET;
+	hsdev->dmadr = res->start + SATA_DWC_REG_OFFSET + offsetof(struct sata_dwc_regs, dmadr);
+
+	/* Setup port */
+	host->ports[0]->ioaddr.cmd_addr = base;
+	host->ports[0]->ioaddr.scr_addr = base + SATA_DWC_SCR_OFFSET;
+	sata_dwc_setup_port(&host->ports[0]->ioaddr, base);
+
+	/* Read the ID and Version Registers */
+	idr = sata_dwc_readl(&hsdev->sata_dwc_regs->idr);
+	versionr = sata_dwc_readl(&hsdev->sata_dwc_regs->versionr);
+	dev_notice(&ofdev->dev, "id %d, controller version %c.%c%c\n",
+		   idr, ver[0], ver[1], ver[2]);
+
+	/* Save dev for later use in dev_xxx() routines */
+	hsdev->dev = &ofdev->dev;
+
+	/* Enable SATA Interrupts */
+	sata_dwc_enable_interrupts(hsdev);
+
+	/* Get SATA interrupt number */
+	irq = irq_of_parse_and_map(np, 0);
+	if (irq == NO_IRQ) {
+		dev_err(&ofdev->dev, "no SATA DMA irq\n");
+		return -ENODEV;
+	}
+
+#ifdef CONFIG_SATA_DWC_OLD_DMA
+	if (!of_find_property(np, "dmas", NULL)) {
+		err = sata_dwc_dma_init_old(ofdev, hsdev);
+		if (err)
+			return err;
+	}
+#endif
+
+	hsdev->phy = devm_phy_optional_get(hsdev->dev, "sata-phy");
+	if (IS_ERR(hsdev->phy))
+		return PTR_ERR(hsdev->phy);
+
+	err = phy_init(hsdev->phy);
+	if (err)
+		goto error_out;
+
+	/*
+	 * 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
+	 */
+	err = ata_host_activate(host, irq, sata_dwc_isr, 0, &sata_dwc_sht);
+	if (err)
+		dev_err(&ofdev->dev, "failed to activate host");
+
+	return 0;
+
+error_out:
+	phy_exit(hsdev->phy);
+	return err;
+}
+
+static int sata_dwc_remove(struct platform_device *ofdev)
+{
+	struct device *dev = &ofdev->dev;
+	struct ata_host *host = dev_get_drvdata(dev);
+	struct sata_dwc_device *hsdev = host->private_data;
+
+	ata_host_detach(host);
+
+	phy_exit(hsdev->phy);
+
+#ifdef CONFIG_SATA_DWC_OLD_DMA
+	/* Free SATA DMA resources */
+	sata_dwc_dma_exit_old(hsdev);
+#endif
+
+	dev_dbg(&ofdev->dev, "done\n");
+	return 0;
+}
+
+static const struct of_device_id sata_dwc_match[] = {
+	{ .compatible = "amcc,sata-460ex", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, sata_dwc_match);
+
+static struct platform_driver sata_dwc_driver = {
+	.driver = {
+		.name = DRV_NAME,
+		.of_match_table = sata_dwc_match,
+	},
+	.probe = sata_dwc_probe,
+	.remove = sata_dwc_remove,
+};
+
+module_platform_driver(sata_dwc_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mark Miesfeld <mmiesfeld@amcc.com>");
+MODULE_DESCRIPTION("DesignWare Cores SATA controller low level driver");
+MODULE_VERSION(DRV_VERSION);