/*
   * drivers/ata/sata_fsl.c
   *
   * Freescale 3.0Gbps SATA device driver
   *
   * Author: Ashish Kalra <ashish.kalra@freescale.com>
   * Li Yang <leoli@freescale.com>
   *

   * Copyright (c) 2006-2007, 2011-2012 Freescale Semiconductor, Inc.

   *
   * 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 of the  License, or (at your
   * option) any later version.
   *
   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/platform_device.h>

  #include <linux/slab.h>

  
  #include <scsi/scsi_host.h>
  #include <scsi/scsi_cmnd.h>
  #include <linux/libata.h>
  #include <asm/io.h>

  #include <linux/of_address.h>
  #include <linux/of_irq.h>

  #include <linux/of_platform.h>

  static unsigned int intr_coalescing_count;
  module_param(intr_coalescing_count, int, S_IRUGO);
  MODULE_PARM_DESC(intr_coalescing_count,
  				 "INT coalescing count threshold (1..31)");
  
  static unsigned int intr_coalescing_ticks;
  module_param(intr_coalescing_ticks, int, S_IRUGO);
  MODULE_PARM_DESC(intr_coalescing_ticks,
  				 "INT coalescing timer threshold in AHB ticks");

  /* Controller information */
  enum {
  	SATA_FSL_QUEUE_DEPTH	= 16,
  	SATA_FSL_MAX_PRD	= 63,
  	SATA_FSL_MAX_PRD_USABLE	= SATA_FSL_MAX_PRD - 1,
  	SATA_FSL_MAX_PRD_DIRECT	= 16,	/* Direct PRDT entries */

  	SATA_FSL_HOST_FLAGS	= (ATA_FLAG_SATA | ATA_FLAG_PIO_DMA |

  				   ATA_FLAG_PMP | ATA_FLAG_NCQ |
  				   ATA_FLAG_AN | ATA_FLAG_NO_LOG_PAGE),

  
  	SATA_FSL_MAX_CMDS	= SATA_FSL_QUEUE_DEPTH,
  	SATA_FSL_CMD_HDR_SIZE	= 16,	/* 4 DWORDS */
  	SATA_FSL_CMD_SLOT_SIZE  = (SATA_FSL_MAX_CMDS * SATA_FSL_CMD_HDR_SIZE),
  
  	/*
  	 * SATA-FSL host controller supports a max. of (15+1) direct PRDEs, and

  	 * chained indirect PRDEs up to a max count of 63.

  	 * We are allocating an array of 63 PRDEs contiguously, but PRDE#15 will

  	 * be setup as an indirect descriptor, pointing to it's next

  	 * (contiguous) PRDE. Though chained indirect PRDE arrays are

  	 * supported,it will be more efficient to use a direct PRDT and
  	 * a single chain/link to indirect PRDE array/PRDT.
  	 */
  
  	SATA_FSL_CMD_DESC_CFIS_SZ	= 32,
  	SATA_FSL_CMD_DESC_SFIS_SZ	= 32,
  	SATA_FSL_CMD_DESC_ACMD_SZ	= 16,
  	SATA_FSL_CMD_DESC_RSRVD		= 16,
  
  	SATA_FSL_CMD_DESC_SIZE	= (SATA_FSL_CMD_DESC_CFIS_SZ +
  				 SATA_FSL_CMD_DESC_SFIS_SZ +
  				 SATA_FSL_CMD_DESC_ACMD_SZ +
  				 SATA_FSL_CMD_DESC_RSRVD +
  				 SATA_FSL_MAX_PRD * 16),
  
  	SATA_FSL_CMD_DESC_OFFSET_TO_PRDT	=
  				(SATA_FSL_CMD_DESC_CFIS_SZ +
  				 SATA_FSL_CMD_DESC_SFIS_SZ +
  				 SATA_FSL_CMD_DESC_ACMD_SZ +
  				 SATA_FSL_CMD_DESC_RSRVD),
  
  	SATA_FSL_CMD_DESC_AR_SZ	= (SATA_FSL_CMD_DESC_SIZE * SATA_FSL_MAX_CMDS),
  	SATA_FSL_PORT_PRIV_DMA_SZ = (SATA_FSL_CMD_SLOT_SIZE +
  					SATA_FSL_CMD_DESC_AR_SZ),
  
  	/*
  	 * MPC8315 has two SATA controllers, SATA1 & SATA2
  	 * (one port per controller)
  	 * MPC837x has 2/4 controllers, one port per controller
  	 */
  
  	SATA_FSL_MAX_PORTS	= 1,
  
  	SATA_FSL_IRQ_FLAG	= IRQF_SHARED,
  };
  
  /*

   * Interrupt Coalescing Control Register bitdefs  */
  enum {
  	ICC_MIN_INT_COUNT_THRESHOLD	= 1,
  	ICC_MAX_INT_COUNT_THRESHOLD	= ((1 << 5) - 1),
  	ICC_MIN_INT_TICKS_THRESHOLD	= 0,
  	ICC_MAX_INT_TICKS_THRESHOLD	= ((1 << 19) - 1),
  	ICC_SAFE_INT_TICKS		= 1,
  };
  
  /*

  * Host Controller command register set - per port
  */
  enum {
  	CQ = 0,
  	CA = 8,
  	CC = 0x10,
  	CE = 0x18,
  	DE = 0x20,
  	CHBA = 0x24,
  	HSTATUS = 0x28,
  	HCONTROL = 0x2C,
  	CQPMP = 0x30,
  	SIGNATURE = 0x34,
  	ICC = 0x38,
  
  	/*
  	 * Host Status Register (HStatus) bitdefs
  	 */
  	ONLINE = (1 << 31),
  	GOING_OFFLINE = (1 << 30),
  	BIST_ERR = (1 << 29),

  	CLEAR_ERROR = (1 << 27),

  
  	FATAL_ERR_HC_MASTER_ERR = (1 << 18),
  	FATAL_ERR_PARITY_ERR_TX = (1 << 17),
  	FATAL_ERR_PARITY_ERR_RX = (1 << 16),
  	FATAL_ERR_DATA_UNDERRUN = (1 << 13),
  	FATAL_ERR_DATA_OVERRUN = (1 << 12),
  	FATAL_ERR_CRC_ERR_TX = (1 << 11),
  	FATAL_ERR_CRC_ERR_RX = (1 << 10),
  	FATAL_ERR_FIFO_OVRFL_TX = (1 << 9),
  	FATAL_ERR_FIFO_OVRFL_RX = (1 << 8),
  
  	FATAL_ERROR_DECODE = FATAL_ERR_HC_MASTER_ERR |
  	    FATAL_ERR_PARITY_ERR_TX |
  	    FATAL_ERR_PARITY_ERR_RX |
  	    FATAL_ERR_DATA_UNDERRUN |
  	    FATAL_ERR_DATA_OVERRUN |
  	    FATAL_ERR_CRC_ERR_TX |
  	    FATAL_ERR_CRC_ERR_RX |
  	    FATAL_ERR_FIFO_OVRFL_TX | FATAL_ERR_FIFO_OVRFL_RX,

  	INT_ON_DATA_LENGTH_MISMATCH = (1 << 12),

  	INT_ON_FATAL_ERR = (1 << 5),
  	INT_ON_PHYRDY_CHG = (1 << 4),
  
  	INT_ON_SIGNATURE_UPDATE = (1 << 3),
  	INT_ON_SNOTIFY_UPDATE = (1 << 2),
  	INT_ON_SINGL_DEVICE_ERR = (1 << 1),
  	INT_ON_CMD_COMPLETE = 1,

  	INT_ON_ERROR = INT_ON_FATAL_ERR | INT_ON_SNOTIFY_UPDATE |

  	    INT_ON_PHYRDY_CHG | INT_ON_SINGL_DEVICE_ERR,
  
  	/*
  	 * Host Control Register (HControl) bitdefs
  	 */
  	HCONTROL_ONLINE_PHY_RST = (1 << 31),
  	HCONTROL_FORCE_OFFLINE = (1 << 30),

  	HCONTROL_LEGACY = (1 << 28),

  	HCONTROL_PARITY_PROT_MOD = (1 << 14),
  	HCONTROL_DPATH_PARITY = (1 << 12),
  	HCONTROL_SNOOP_ENABLE = (1 << 10),
  	HCONTROL_PMP_ATTACHED = (1 << 9),
  	HCONTROL_COPYOUT_STATFIS = (1 << 8),
  	IE_ON_FATAL_ERR = (1 << 5),
  	IE_ON_PHYRDY_CHG = (1 << 4),
  	IE_ON_SIGNATURE_UPDATE = (1 << 3),
  	IE_ON_SNOTIFY_UPDATE = (1 << 2),
  	IE_ON_SINGL_DEVICE_ERR = (1 << 1),
  	IE_ON_CMD_COMPLETE = 1,
  
  	DEFAULT_PORT_IRQ_ENABLE_MASK = IE_ON_FATAL_ERR | IE_ON_PHYRDY_CHG |

  	    IE_ON_SIGNATURE_UPDATE | IE_ON_SNOTIFY_UPDATE |

  	    IE_ON_SINGL_DEVICE_ERR | IE_ON_CMD_COMPLETE,
  
  	EXT_INDIRECT_SEG_PRD_FLAG = (1 << 31),

  	DATA_SNOOP_ENABLE_V1 = (1 << 22),
  	DATA_SNOOP_ENABLE_V2 = (1 << 28),

  };
  
  /*
   * SATA Superset Registers
   */
  enum {
  	SSTATUS = 0,
  	SERROR = 4,
  	SCONTROL = 8,
  	SNOTIFY = 0xC,
  };
  
  /*
   * Control Status Register Set
   */
  enum {
  	TRANSCFG = 0,
  	TRANSSTATUS = 4,
  	LINKCFG = 8,
  	LINKCFG1 = 0xC,
  	LINKCFG2 = 0x10,
  	LINKSTATUS = 0x14,
  	LINKSTATUS1 = 0x18,
  	PHYCTRLCFG = 0x1C,
  	COMMANDSTAT = 0x20,
  };

  /* TRANSCFG (transport-layer) configuration control */
  enum {
  	TRANSCFG_RX_WATER_MARK = (1 << 4),
  };

  /* PHY (link-layer) configuration control */
  enum {
  	PHY_BIST_ENABLE = 0x01,
  };
  
  /*
   * Command Header Table entry, i.e, command slot
   * 4 Dwords per command slot, command header size ==  64 Dwords.
   */
  struct cmdhdr_tbl_entry {
  	u32 cda;
  	u32 prde_fis_len;
  	u32 ttl;
  	u32 desc_info;
  };
  
  /*
   * Description information bitdefs
   */
  enum {

  	CMD_DESC_RES = (1 << 11),

  	VENDOR_SPECIFIC_BIST = (1 << 10),
  	CMD_DESC_SNOOP_ENABLE = (1 << 9),
  	FPDMA_QUEUED_CMD = (1 << 8),
  	SRST_CMD = (1 << 7),
  	BIST = (1 << 6),
  	ATAPI_CMD = (1 << 5),
  };
  
  /*
   * Command Descriptor
   */
  struct command_desc {
  	u8 cfis[8 * 4];
  	u8 sfis[8 * 4];
  	u8 acmd[4 * 4];
  	u8 fill[4 * 4];
  	u32 prdt[SATA_FSL_MAX_PRD_DIRECT * 4];
  	u32 prdt_indirect[(SATA_FSL_MAX_PRD - SATA_FSL_MAX_PRD_DIRECT) * 4];
  };
  
  /*
   * Physical region table descriptor(PRD)
   */
  
  struct prde {
  	u32 dba;
  	u8 fill[2 * 4];
  	u32 ddc_and_ext;
  };
  
  /*
   * ata_port private data
   * This is our per-port instance data.
   */
  struct sata_fsl_port_priv {
  	struct cmdhdr_tbl_entry *cmdslot;
  	dma_addr_t cmdslot_paddr;
  	struct command_desc *cmdentry;
  	dma_addr_t cmdentry_paddr;

  };
  
  /*
   * ata_port->host_set private data
   */
  struct sata_fsl_host_priv {
  	void __iomem *hcr_base;
  	void __iomem *ssr_base;
  	void __iomem *csr_base;

  	int irq;

  	int data_snoop;

  	struct device_attribute intr_coalescing;

  	struct device_attribute rx_watermark;

  };

  static void fsl_sata_set_irq_coalescing(struct ata_host *host,
  		unsigned int count, unsigned int ticks)
  {
  	struct sata_fsl_host_priv *host_priv = host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;

  	unsigned long flags;

  
  	if (count > ICC_MAX_INT_COUNT_THRESHOLD)
  		count = ICC_MAX_INT_COUNT_THRESHOLD;
  	else if (count < ICC_MIN_INT_COUNT_THRESHOLD)
  		count = ICC_MIN_INT_COUNT_THRESHOLD;
  
  	if (ticks > ICC_MAX_INT_TICKS_THRESHOLD)
  		ticks = ICC_MAX_INT_TICKS_THRESHOLD;
  	else if ((ICC_MIN_INT_TICKS_THRESHOLD == ticks) &&
  			(count > ICC_MIN_INT_COUNT_THRESHOLD))
  		ticks = ICC_SAFE_INT_TICKS;

  	spin_lock_irqsave(&host->lock, flags);

  	iowrite32((count << 24 | ticks), hcr_base + ICC);
  
  	intr_coalescing_count = count;
  	intr_coalescing_ticks = ticks;

  	spin_unlock_irqrestore(&host->lock, flags);

  	DPRINTK("interrupt coalescing, count = 0x%x, ticks = %x
  ",

  			intr_coalescing_count, intr_coalescing_ticks);
  	DPRINTK("ICC register status: (hcr base: 0x%x) = 0x%x
  ",
  			hcr_base, ioread32(hcr_base + ICC));
  }
  
  static ssize_t fsl_sata_intr_coalescing_show(struct device *dev,
  		struct device_attribute *attr, char *buf)
  {
  	return sprintf(buf, "%d	%d
  ",
  			intr_coalescing_count, intr_coalescing_ticks);
  }
  
  static ssize_t fsl_sata_intr_coalescing_store(struct device *dev,
  		struct device_attribute *attr,
  		const char *buf, size_t count)
  {
  	unsigned int coalescing_count,	coalescing_ticks;
  
  	if (sscanf(buf, "%d%d",
  				&coalescing_count,
  				&coalescing_ticks) != 2) {
  		printk(KERN_ERR "fsl-sata: wrong parameter format.
  ");
  		return -EINVAL;
  	}
  
  	fsl_sata_set_irq_coalescing(dev_get_drvdata(dev),
  			coalescing_count, coalescing_ticks);
  
  	return strlen(buf);
  }

  static ssize_t fsl_sata_rx_watermark_show(struct device *dev,
  		struct device_attribute *attr, char *buf)
  {
  	unsigned int rx_watermark;
  	unsigned long flags;
  	struct ata_host *host = dev_get_drvdata(dev);
  	struct sata_fsl_host_priv *host_priv = host->private_data;
  	void __iomem *csr_base = host_priv->csr_base;
  
  	spin_lock_irqsave(&host->lock, flags);
  	rx_watermark = ioread32(csr_base + TRANSCFG);
  	rx_watermark &= 0x1f;
  
  	spin_unlock_irqrestore(&host->lock, flags);
  	return sprintf(buf, "%d
  ", rx_watermark);
  }
  
  static ssize_t fsl_sata_rx_watermark_store(struct device *dev,
  		struct device_attribute *attr,
  		const char *buf, size_t count)
  {
  	unsigned int rx_watermark;
  	unsigned long flags;
  	struct ata_host *host = dev_get_drvdata(dev);
  	struct sata_fsl_host_priv *host_priv = host->private_data;
  	void __iomem *csr_base = host_priv->csr_base;
  	u32 temp;
  
  	if (sscanf(buf, "%d", &rx_watermark) != 1) {
  		printk(KERN_ERR "fsl-sata: wrong parameter format.
  ");
  		return -EINVAL;
  	}
  
  	spin_lock_irqsave(&host->lock, flags);
  	temp = ioread32(csr_base + TRANSCFG);
  	temp &= 0xffffffe0;
  	iowrite32(temp | rx_watermark, csr_base + TRANSCFG);
  
  	spin_unlock_irqrestore(&host->lock, flags);
  	return strlen(buf);
  }

  static inline unsigned int sata_fsl_tag(unsigned int tag,

  					void __iomem *hcr_base)

  {
  	/* We let libATA core do actual (queue) tag allocation */
  
  	/* all non NCQ/queued commands should have tag#0 */
  	if (ata_tag_internal(tag)) {
  		DPRINTK("mapping internal cmds to tag#0
  ");
  		return 0;
  	}
  
  	if (unlikely(tag >= SATA_FSL_QUEUE_DEPTH)) {
  		DPRINTK("tag %d invalid : out of range
  ", tag);
  		return 0;
  	}
  
  	if (unlikely((ioread32(hcr_base + CQ)) & (1 << tag))) {
  		DPRINTK("tag %d invalid : in use!!
  ", tag);
  		return 0;
  	}
  
  	return tag;
  }
  
  static void sata_fsl_setup_cmd_hdr_entry(struct sata_fsl_port_priv *pp,
  					 unsigned int tag, u32 desc_info,
  					 u32 data_xfer_len, u8 num_prde,
  					 u8 fis_len)
  {
  	dma_addr_t cmd_descriptor_address;
  
  	cmd_descriptor_address = pp->cmdentry_paddr +
  	    tag * SATA_FSL_CMD_DESC_SIZE;
  
  	/* NOTE: both data_xfer_len & fis_len are Dword counts */
  
  	pp->cmdslot[tag].cda = cpu_to_le32(cmd_descriptor_address);
  	pp->cmdslot[tag].prde_fis_len =
  	    cpu_to_le32((num_prde << 16) | (fis_len << 2));
  	pp->cmdslot[tag].ttl = cpu_to_le32(data_xfer_len & ~0x03);

  	pp->cmdslot[tag].desc_info = cpu_to_le32(desc_info | (tag & 0x1F));

  
  	VPRINTK("cda=0x%x, prde_fis_len=0x%x, ttl=0x%x, di=0x%x
  ",
  		pp->cmdslot[tag].cda,
  		pp->cmdslot[tag].prde_fis_len,
  		pp->cmdslot[tag].ttl, pp->cmdslot[tag].desc_info);
  
  }
  
  static unsigned int sata_fsl_fill_sg(struct ata_queued_cmd *qc, void *cmd_desc,

  				     u32 *ttl, dma_addr_t cmd_desc_paddr,
  				     int data_snoop)

  {
  	struct scatterlist *sg;
  	unsigned int num_prde = 0;
  	u32 ttl_dwords = 0;
  
  	/*

  	 * NOTE : direct & indirect prdt's are contiguously allocated

  	 */
  	struct prde *prd = (struct prde *)&((struct command_desc *)
  					    cmd_desc)->prdt;
  
  	struct prde *prd_ptr_to_indirect_ext = NULL;
  	unsigned indirect_ext_segment_sz = 0;
  	dma_addr_t indirect_ext_segment_paddr;

  	unsigned int si;

  	VPRINTK("SATA FSL : cd = 0x%p, prd = 0x%p
  ", cmd_desc, prd);

  
  	indirect_ext_segment_paddr = cmd_desc_paddr +
  	    SATA_FSL_CMD_DESC_OFFSET_TO_PRDT + SATA_FSL_MAX_PRD_DIRECT * 16;

  	for_each_sg(qc->sg, sg, qc->n_elem, si) {

  		dma_addr_t sg_addr = sg_dma_address(sg);
  		u32 sg_len = sg_dma_len(sg);

  		VPRINTK("SATA FSL : fill_sg, sg_addr = 0x%llx, sg_len = %d
  ",
  			(unsigned long long)sg_addr, sg_len);

  
  		/* warn if each s/g element is not dword aligned */

  		if (unlikely(sg_addr & 0x03))

  			ata_port_err(qc->ap, "s/g addr unaligned : 0x%llx
  ",
  				     (unsigned long long)sg_addr);

  		if (unlikely(sg_len & 0x03))

  			ata_port_err(qc->ap, "s/g len unaligned : 0x%x
  ",
  				     sg_len);

  		if (num_prde == (SATA_FSL_MAX_PRD_DIRECT - 1) &&
  		    sg_next(sg) != NULL) {

  			VPRINTK("setting indirect prde
  ");
  			prd_ptr_to_indirect_ext = prd;
  			prd->dba = cpu_to_le32(indirect_ext_segment_paddr);
  			indirect_ext_segment_sz = 0;
  			++prd;
  			++num_prde;
  		}
  
  		ttl_dwords += sg_len;
  		prd->dba = cpu_to_le32(sg_addr);

  		prd->ddc_and_ext = cpu_to_le32(data_snoop | (sg_len & ~0x03));

  
  		VPRINTK("sg_fill, ttl=%d, dba=0x%x, ddc=0x%x
  ",
  			ttl_dwords, prd->dba, prd->ddc_and_ext);
  
  		++num_prde;
  		++prd;
  		if (prd_ptr_to_indirect_ext)
  			indirect_ext_segment_sz += sg_len;
  	}
  
  	if (prd_ptr_to_indirect_ext) {
  		/* set indirect extension flag along with indirect ext. size */
  		prd_ptr_to_indirect_ext->ddc_and_ext =
  		    cpu_to_le32((EXT_INDIRECT_SEG_PRD_FLAG |

  				 data_snoop |

  				 (indirect_ext_segment_sz & ~0x03)));
  	}
  
  	*ttl = ttl_dwords;
  	return num_prde;
  }
  
  static void sata_fsl_qc_prep(struct ata_queued_cmd *qc)
  {
  	struct ata_port *ap = qc->ap;
  	struct sata_fsl_port_priv *pp = ap->private_data;
  	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;
  	unsigned int tag = sata_fsl_tag(qc->tag, hcr_base);
  	struct command_desc *cd;

  	u32 desc_info = CMD_DESC_RES | CMD_DESC_SNOOP_ENABLE;

  	u32 num_prde = 0;
  	u32 ttl_dwords = 0;
  	dma_addr_t cd_paddr;
  
  	cd = (struct command_desc *)pp->cmdentry + tag;
  	cd_paddr = pp->cmdentry_paddr + tag * SATA_FSL_CMD_DESC_SIZE;

  	ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *) &cd->cfis);

  
  	VPRINTK("Dumping cfis : 0x%x, 0x%x, 0x%x
  ",
  		cd->cfis[0], cd->cfis[1], cd->cfis[2]);
  
  	if (qc->tf.protocol == ATA_PROT_NCQ) {
  		VPRINTK("FPDMA xfer,Sctor cnt[0:7],[8:15] = %d,%d
  ",
  			cd->cfis[3], cd->cfis[11]);
  	}
  
  	/* setup "ACMD - atapi command" in cmd. desc. if this is ATAPI cmd */

  	if (ata_is_atapi(qc->tf.protocol)) {

  		desc_info |= ATAPI_CMD;
  		memset((void *)&cd->acmd, 0, 32);
  		memcpy((void *)&cd->acmd, qc->cdb, qc->dev->cdb_len);
  	}
  
  	if (qc->flags & ATA_QCFLAG_DMAMAP)
  		num_prde = sata_fsl_fill_sg(qc, (void *)cd,

  					    &ttl_dwords, cd_paddr,
  					    host_priv->data_snoop);

  
  	if (qc->tf.protocol == ATA_PROT_NCQ)
  		desc_info |= FPDMA_QUEUED_CMD;
  
  	sata_fsl_setup_cmd_hdr_entry(pp, tag, desc_info, ttl_dwords,
  				     num_prde, 5);
  
  	VPRINTK("SATA FSL : xx_qc_prep, di = 0x%x, ttl = %d, num_prde = %d
  ",
  		desc_info, ttl_dwords, num_prde);
  }
  
  static unsigned int sata_fsl_qc_issue(struct ata_queued_cmd *qc)
  {
  	struct ata_port *ap = qc->ap;
  	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;
  	unsigned int tag = sata_fsl_tag(qc->tag, hcr_base);
  
  	VPRINTK("xx_qc_issue called,CQ=0x%x,CA=0x%x,CE=0x%x,CC=0x%x
  ",
  		ioread32(CQ + hcr_base),
  		ioread32(CA + hcr_base),
  		ioread32(CE + hcr_base), ioread32(CC + hcr_base));

  	iowrite32(qc->dev->link->pmp, CQPMP + hcr_base);

  	/* Simply queue command to the controller/device */
  	iowrite32(1 << tag, CQ + hcr_base);
  
  	VPRINTK("xx_qc_issue called, tag=%d, CQ=0x%x, CA=0x%x
  ",
  		tag, ioread32(CQ + hcr_base), ioread32(CA + hcr_base));
  
  	VPRINTK("CE=0x%x, DE=0x%x, CC=0x%x, CmdStat = 0x%x
  ",
  		ioread32(CE + hcr_base),
  		ioread32(DE + hcr_base),

  		ioread32(CC + hcr_base),
  		ioread32(COMMANDSTAT + host_priv->csr_base));

  
  	return 0;
  }

  static bool sata_fsl_qc_fill_rtf(struct ata_queued_cmd *qc)
  {
  	struct sata_fsl_port_priv *pp = qc->ap->private_data;
  	struct sata_fsl_host_priv *host_priv = qc->ap->host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;
  	unsigned int tag = sata_fsl_tag(qc->tag, hcr_base);
  	struct command_desc *cd;
  
  	cd = pp->cmdentry + tag;
  
  	ata_tf_from_fis(cd->sfis, &qc->result_tf);
  	return true;
  }

  static int sata_fsl_scr_write(struct ata_link *link,
  			      unsigned int sc_reg_in, u32 val)

  {

  	struct sata_fsl_host_priv *host_priv = link->ap->host->private_data;

  	void __iomem *ssr_base = host_priv->ssr_base;
  	unsigned int sc_reg;
  
  	switch (sc_reg_in) {
  	case SCR_STATUS:

  	case SCR_ERROR:

  	case SCR_CONTROL:

  	case SCR_ACTIVE:

  		sc_reg = sc_reg_in;

  		break;
  	default:
  		return -EINVAL;
  	}
  
  	VPRINTK("xx_scr_write, reg_in = %d
  ", sc_reg);

  	iowrite32(val, ssr_base + (sc_reg * 4));

  	return 0;
  }

  static int sata_fsl_scr_read(struct ata_link *link,
  			     unsigned int sc_reg_in, u32 *val)

  {

  	struct sata_fsl_host_priv *host_priv = link->ap->host->private_data;

  	void __iomem *ssr_base = host_priv->ssr_base;
  	unsigned int sc_reg;
  
  	switch (sc_reg_in) {
  	case SCR_STATUS:

  	case SCR_ERROR:

  	case SCR_CONTROL:

  	case SCR_ACTIVE:

  		sc_reg = sc_reg_in;

  		break;
  	default:
  		return -EINVAL;
  	}
  
  	VPRINTK("xx_scr_read, reg_in = %d
  ", sc_reg);

  	*val = ioread32(ssr_base + (sc_reg * 4));

  	return 0;
  }
  
  static void sata_fsl_freeze(struct ata_port *ap)
  {
  	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;
  	u32 temp;
  
  	VPRINTK("xx_freeze, CQ=0x%x, CA=0x%x, CE=0x%x, DE=0x%x
  ",
  		ioread32(CQ + hcr_base),
  		ioread32(CA + hcr_base),
  		ioread32(CE + hcr_base), ioread32(DE + hcr_base));

  	VPRINTK("CmdStat = 0x%x
  ",
  		ioread32(host_priv->csr_base + COMMANDSTAT));

  
  	/* disable interrupts on the controller/port */
  	temp = ioread32(hcr_base + HCONTROL);
  	iowrite32((temp & ~0x3F), hcr_base + HCONTROL);
  
  	VPRINTK("in xx_freeze : HControl = 0x%x, HStatus = 0x%x
  ",
  		ioread32(hcr_base + HCONTROL), ioread32(hcr_base + HSTATUS));
  }
  
  static void sata_fsl_thaw(struct ata_port *ap)
  {
  	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;
  	u32 temp;
  
  	/* ack. any pending IRQs for this controller/port */
  	temp = ioread32(hcr_base + HSTATUS);
  
  	VPRINTK("xx_thaw, pending IRQs = 0x%x
  ", (temp & 0x3F));
  
  	if (temp & 0x3F)
  		iowrite32((temp & 0x3F), hcr_base + HSTATUS);
  
  	/* enable interrupts on the controller/port */
  	temp = ioread32(hcr_base + HCONTROL);
  	iowrite32((temp | DEFAULT_PORT_IRQ_ENABLE_MASK), hcr_base + HCONTROL);
  
  	VPRINTK("xx_thaw : HControl = 0x%x, HStatus = 0x%x
  ",
  		ioread32(hcr_base + HCONTROL), ioread32(hcr_base + HSTATUS));
  }

  static void sata_fsl_pmp_attach(struct ata_port *ap)
  {
  	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;
  	u32 temp;
  
  	temp = ioread32(hcr_base + HCONTROL);
  	iowrite32((temp | HCONTROL_PMP_ATTACHED), hcr_base + HCONTROL);
  }
  
  static void sata_fsl_pmp_detach(struct ata_port *ap)
  {
  	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;
  	u32 temp;
  
  	temp = ioread32(hcr_base + HCONTROL);
  	temp &= ~HCONTROL_PMP_ATTACHED;
  	iowrite32(temp, hcr_base + HCONTROL);
  
  	/* enable interrupts on the controller/port */
  	temp = ioread32(hcr_base + HCONTROL);
  	iowrite32((temp | DEFAULT_PORT_IRQ_ENABLE_MASK), hcr_base + HCONTROL);
  
  }

  static int sata_fsl_port_start(struct ata_port *ap)
  {
  	struct device *dev = ap->host->dev;
  	struct sata_fsl_port_priv *pp;

  	void *mem;
  	dma_addr_t mem_dma;
  	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;
  	u32 temp;
  
  	pp = kzalloc(sizeof(*pp), GFP_KERNEL);
  	if (!pp)
  		return -ENOMEM;

  	mem = dma_zalloc_coherent(dev, SATA_FSL_PORT_PRIV_DMA_SZ, &mem_dma,
  				  GFP_KERNEL);

  	if (!mem) {

  		kfree(pp);
  		return -ENOMEM;
  	}

  
  	pp->cmdslot = mem;
  	pp->cmdslot_paddr = mem_dma;
  
  	mem += SATA_FSL_CMD_SLOT_SIZE;
  	mem_dma += SATA_FSL_CMD_SLOT_SIZE;
  
  	pp->cmdentry = mem;
  	pp->cmdentry_paddr = mem_dma;
  
  	ap->private_data = pp;
  
  	VPRINTK("CHBA = 0x%x, cmdentry_phys = 0x%x
  ",
  		pp->cmdslot_paddr, pp->cmdentry_paddr);
  
  	/* Now, update the CHBA register in host controller cmd register set */
  	iowrite32(pp->cmdslot_paddr & 0xffffffff, hcr_base + CHBA);
  
  	/*
  	 * Now, we can bring the controller on-line & also initiate
  	 * the COMINIT sequence, we simply return here and the boot-probing
  	 * & device discovery process is re-initiated by libATA using a
  	 * Softreset EH (dummy) session. Hence, boot probing and device
  	 * discovey will be part of sata_fsl_softreset() callback.
  	 */
  
  	temp = ioread32(hcr_base + HCONTROL);
  	iowrite32((temp | HCONTROL_ONLINE_PHY_RST), hcr_base + HCONTROL);
  
  	VPRINTK("HStatus = 0x%x
  ", ioread32(hcr_base + HSTATUS));
  	VPRINTK("HControl = 0x%x
  ", ioread32(hcr_base + HCONTROL));
  	VPRINTK("CHBA  = 0x%x
  ", ioread32(hcr_base + CHBA));

  	return 0;
  }
  
  static void sata_fsl_port_stop(struct ata_port *ap)
  {
  	struct device *dev = ap->host->dev;
  	struct sata_fsl_port_priv *pp = ap->private_data;
  	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;
  	u32 temp;
  
  	/*
  	 * Force host controller to go off-line, aborting current operations
  	 */
  	temp = ioread32(hcr_base + HCONTROL);
  	temp &= ~HCONTROL_ONLINE_PHY_RST;
  	temp |= HCONTROL_FORCE_OFFLINE;
  	iowrite32(temp, hcr_base + HCONTROL);
  
  	/* Poll for controller to go offline - should happen immediately */

  	ata_wait_register(ap, hcr_base + HSTATUS, ONLINE, ONLINE, 1, 1);

  
  	ap->private_data = NULL;
  	dma_free_coherent(dev, SATA_FSL_PORT_PRIV_DMA_SZ,
  			  pp->cmdslot, pp->cmdslot_paddr);

  	kfree(pp);
  }
  
  static unsigned int sata_fsl_dev_classify(struct ata_port *ap)
  {
  	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;
  	struct ata_taskfile tf;
  	u32 temp;
  
  	temp = ioread32(hcr_base + SIGNATURE);
  
  	VPRINTK("raw sig = 0x%x
  ", temp);
  	VPRINTK("HStatus = 0x%x
  ", ioread32(hcr_base + HSTATUS));
  	VPRINTK("HControl = 0x%x
  ", ioread32(hcr_base + HCONTROL));
  
  	tf.lbah = (temp >> 24) & 0xff;
  	tf.lbam = (temp >> 16) & 0xff;
  	tf.lbal = (temp >> 8) & 0xff;
  	tf.nsect = temp & 0xff;
  
  	return ata_dev_classify(&tf);
  }

  static int sata_fsl_hardreset(struct ata_link *link, unsigned int *class,

  					unsigned long deadline)

  {

  	struct ata_port *ap = link->ap;

  	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;
  	u32 temp;

  	int i = 0;

  	unsigned long start_jiffies;

  	DPRINTK("in xx_hardreset
  ");

  try_offline_again:
  	/*
  	 * Force host controller to go off-line, aborting current operations
  	 */
  	temp = ioread32(hcr_base + HCONTROL);
  	temp &= ~HCONTROL_ONLINE_PHY_RST;
  	iowrite32(temp, hcr_base + HCONTROL);
  
  	/* Poll for controller to go offline */

  	temp = ata_wait_register(ap, hcr_base + HSTATUS, ONLINE, ONLINE,
  				 1, 500);

  
  	if (temp & ONLINE) {

  		ata_port_err(ap, "Hardreset failed, not off-lined %d
  ", i);

  
  		/*
  		 * Try to offline controller atleast twice
  		 */
  		i++;
  		if (i == 2)
  			goto err;
  		else
  			goto try_offline_again;
  	}

  	DPRINTK("hardreset, controller off-lined
  ");

  	VPRINTK("HStatus = 0x%x
  ", ioread32(hcr_base + HSTATUS));
  	VPRINTK("HControl = 0x%x
  ", ioread32(hcr_base + HCONTROL));
  
  	/*
  	 * PHY reset should remain asserted for atleast 1ms
  	 */

  	ata_msleep(ap, 1);

  	sata_set_spd(link);

  	/*
  	 * Now, bring the host controller online again, this can take time
  	 * as PHY reset and communication establishment, 1st D2H FIS and
  	 * device signature update is done, on safe side assume 500ms
  	 * NOTE : Host online status may be indicated immediately!!
  	 */
  
  	temp = ioread32(hcr_base + HCONTROL);
  	temp |= (HCONTROL_ONLINE_PHY_RST | HCONTROL_SNOOP_ENABLE);

  	temp |= HCONTROL_PMP_ATTACHED;

  	iowrite32(temp, hcr_base + HCONTROL);

  	temp = ata_wait_register(ap, hcr_base + HSTATUS, ONLINE, 0, 1, 500);

  
  	if (!(temp & ONLINE)) {

  		ata_port_err(ap, "Hardreset failed, not on-lined
  ");

  		goto err;
  	}

  	DPRINTK("hardreset, controller off-lined & on-lined
  ");

  	VPRINTK("HStatus = 0x%x
  ", ioread32(hcr_base + HSTATUS));
  	VPRINTK("HControl = 0x%x
  ", ioread32(hcr_base + HCONTROL));
  
  	/*
  	 * First, wait for the PHYRDY change to occur before waiting for
  	 * the signature, and also verify if SStatus indicates device
  	 * presence
  	 */

  	temp = ata_wait_register(ap, hcr_base + HSTATUS, 0xFF, 0, 1, 500);

  	if ((!(temp & 0x10)) || ata_link_offline(link)) {

  		ata_port_warn(ap, "No Device OR PHYRDY change,Hstatus = 0x%x
  ",
  			      ioread32(hcr_base + HSTATUS));

  		*class = ATA_DEV_NONE;

  		return 0;

  	}
  
  	/*
  	 * Wait for the first D2H from device,i.e,signature update notification
  	 */
  	start_jiffies = jiffies;

  	temp = ata_wait_register(ap, hcr_base + HSTATUS, 0xFF, 0x10,

  			500, jiffies_to_msecs(deadline - start_jiffies));
  
  	if ((temp & 0xFF) != 0x18) {

  		ata_port_warn(ap, "No Signature Update
  ");

  		*class = ATA_DEV_NONE;

  		goto do_followup_srst;

  	} else {

  		ata_port_info(ap, "Signature Update detected @ %d msecs
  ",
  			      jiffies_to_msecs(jiffies - start_jiffies));

  		*class = sata_fsl_dev_classify(ap);
  		return 0;
  	}
  
  do_followup_srst:
  	/*
  	 * request libATA to perform follow-up softreset
  	 */
  	return -EAGAIN;
  
  err:
  	return -EIO;
  }
  
  static int sata_fsl_softreset(struct ata_link *link, unsigned int *class,
  					unsigned long deadline)
  {
  	struct ata_port *ap = link->ap;
  	struct sata_fsl_port_priv *pp = ap->private_data;
  	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;
  	int pmp = sata_srst_pmp(link);
  	u32 temp;
  	struct ata_taskfile tf;
  	u8 *cfis;
  	u32 Serror;
  
  	DPRINTK("in xx_softreset
  ");
  
  	if (ata_link_offline(link)) {
  		DPRINTK("PHY reports no device
  ");
  		*class = ATA_DEV_NONE;
  		return 0;

  	}
  
  	/*
  	 * Send a device reset (SRST) explicitly on command slot #0
  	 * Check : will the command queue (reg) be cleared during offlining ??
  	 * Also we will be online only if Phy commn. has been established
  	 * and device presence has been detected, therefore if we have
  	 * reached here, we can send a command to the target device
  	 */

  	DPRINTK("Sending SRST/device reset
  ");

  	ata_tf_init(link->device, &tf);

  	cfis = (u8 *) &pp->cmdentry->cfis;

  
  	/* device reset/SRST is a control register update FIS, uses tag0 */
  	sata_fsl_setup_cmd_hdr_entry(pp, 0,

  		SRST_CMD | CMD_DESC_RES | CMD_DESC_SNOOP_ENABLE, 0, 0, 5);

  
  	tf.ctl |= ATA_SRST;	/* setup SRST bit in taskfile control reg */

  	ata_tf_to_fis(&tf, pmp, 0, cfis);

  
  	DPRINTK("Dumping cfis : 0x%x, 0x%x, 0x%x, 0x%x
  ",
  		cfis[0], cfis[1], cfis[2], cfis[3]);
  
  	/*
  	 * Queue SRST command to the controller/device, ensure that no
  	 * other commands are active on the controller/device
  	 */
  
  	DPRINTK("@Softreset, CQ = 0x%x, CA = 0x%x, CC = 0x%x
  ",
  		ioread32(CQ + hcr_base),
  		ioread32(CA + hcr_base), ioread32(CC + hcr_base));
  
  	iowrite32(0xFFFF, CC + hcr_base);

  	if (pmp != SATA_PMP_CTRL_PORT)
  		iowrite32(pmp, CQPMP + hcr_base);

  	iowrite32(1, CQ + hcr_base);

  	temp = ata_wait_register(ap, CQ + hcr_base, 0x1, 0x1, 1, 5000);

  	if (temp & 0x1) {

  		ata_port_warn(ap, "ATA_SRST issue failed
  ");

  
  		DPRINTK("Softreset@5000,CQ=0x%x,CA=0x%x,CC=0x%x
  ",
  			ioread32(CQ + hcr_base),
  			ioread32(CA + hcr_base), ioread32(CC + hcr_base));

  		sata_fsl_scr_read(&ap->link, SCR_ERROR, &Serror);

  
  		DPRINTK("HStatus = 0x%x
  ", ioread32(hcr_base + HSTATUS));
  		DPRINTK("HControl = 0x%x
  ", ioread32(hcr_base + HCONTROL));
  		DPRINTK("Serror = 0x%x
  ", Serror);
  		goto err;
  	}

  	ata_msleep(ap, 1);

  
  	/*

  	 * SATA device enters reset state after receiving a Control register

  	 * FIS with SRST bit asserted and it awaits another H2D Control reg.
  	 * FIS with SRST bit cleared, then the device does internal diags &
  	 * initialization, followed by indicating it's initialization status
  	 * using ATA signature D2H register FIS to the host controller.
  	 */

  	sata_fsl_setup_cmd_hdr_entry(pp, 0, CMD_DESC_RES | CMD_DESC_SNOOP_ENABLE,
  				      0, 0, 5);

  
  	tf.ctl &= ~ATA_SRST;	/* 2nd H2D Ctl. register FIS */

  	ata_tf_to_fis(&tf, pmp, 0, cfis);

  	if (pmp != SATA_PMP_CTRL_PORT)
  		iowrite32(pmp, CQPMP + hcr_base);

  	iowrite32(1, CQ + hcr_base);

  	ata_msleep(ap, 150);		/* ?? */

  
  	/*
  	 * The above command would have signalled an interrupt on command
  	 * complete, which needs special handling, by clearing the Nth
  	 * command bit of the CCreg
  	 */
  	iowrite32(0x01, CC + hcr_base);	/* We know it will be cmd#0 always */

  
  	DPRINTK("SATA FSL : Now checking device signature
  ");
  
  	*class = ATA_DEV_NONE;
  
  	/* Verify if SStatus indicates device presence */

  	if (ata_link_online(link)) {

  		/*
  		 * if we are here, device presence has been detected,
  		 * 1st D2H FIS would have been received, but sfis in
  		 * command desc. is not updated, but signature register
  		 * would have been updated
  		 */
  
  		*class = sata_fsl_dev_classify(ap);
  
  		DPRINTK("class = %d
  ", *class);
  		VPRINTK("ccreg = 0x%x
  ", ioread32(hcr_base + CC));
  		VPRINTK("cereg = 0x%x
  ", ioread32(hcr_base + CE));
  	}
  
  	return 0;
  
  err:
  	return -EIO;
  }

  static void sata_fsl_error_handler(struct ata_port *ap)
  {
  
  	DPRINTK("in xx_error_handler
  ");
  	sata_pmp_error_handler(ap);
  
  }

  static void sata_fsl_post_internal_cmd(struct ata_queued_cmd *qc)
  {
  	if (qc->flags & ATA_QCFLAG_FAILED)
  		qc->err_mask |= AC_ERR_OTHER;
  
  	if (qc->err_mask) {
  		/* make DMA engine forget about the failed command */
  
  	}
  }

  static void sata_fsl_error_intr(struct ata_port *ap)
  {

  	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;

  	u32 hstatus, dereg=0, cereg = 0, SError = 0;

  	unsigned int err_mask = 0, action = 0;

  	int freeze = 0, abort=0;
  	struct ata_link *link = NULL;
  	struct ata_queued_cmd *qc = NULL;
  	struct ata_eh_info *ehi;

  
  	hstatus = ioread32(hcr_base + HSTATUS);
  	cereg = ioread32(hcr_base + CE);

  	/* first, analyze and record host port events */
  	link = &ap->link;
  	ehi = &link->eh_info;

  	ata_ehi_clear_desc(ehi);
  
  	/*
  	 * Handle & Clear SError
  	 */

  	sata_fsl_scr_read(&ap->link, SCR_ERROR, &SError);

  	if (unlikely(SError & 0xFFFF0000))

  		sata_fsl_scr_write(&ap->link, SCR_ERROR, SError);

  
  	DPRINTK("error_intr,hStat=0x%x,CE=0x%x,DE =0x%x,SErr=0x%x
  ",
  		hstatus, cereg, ioread32(hcr_base + DE), SError);

  	/* handle fatal errors */
  	if (hstatus & FATAL_ERROR_DECODE) {
  		ehi->err_mask |= AC_ERR_ATA_BUS;
  		ehi->action |= ATA_EH_SOFTRESET;

  		freeze = 1;
  	}

  	/* Handle SDB FIS receive & notify update */
  	if (hstatus & INT_ON_SNOTIFY_UPDATE)
  		sata_async_notification(ap);

  	/* Handle PHYRDY change notification */
  	if (hstatus & INT_ON_PHYRDY_CHG) {
  		DPRINTK("SATA FSL: PHYRDY change indication
  ");
  
  		/* Setup a soft-reset EH action */
  		ata_ehi_hotplugged(ehi);

  		ata_ehi_push_desc(ehi, "%s", "PHY RDY changed");

  		freeze = 1;
  	}

  	/* handle single device errors */
  	if (cereg) {
  		/*
  		 * clear the command error, also clears queue to the device
  		 * in error, and we can (re)issue commands to this device.
  		 * When a device is in error all commands queued into the
  		 * host controller and at the device are considered aborted
  		 * and the queue for that device is stopped. Now, after
  		 * clearing the device error, we can issue commands to the
  		 * device to interrogate it to find the source of the error.
  		 */
  		abort = 1;
  
  		DPRINTK("single device error, CE=0x%x, DE=0x%x
  ",
  			ioread32(hcr_base + CE), ioread32(hcr_base + DE));

  		/* find out the offending link and qc */
  		if (ap->nr_pmp_links) {

  			unsigned int dev_num;

  			dereg = ioread32(hcr_base + DE);
  			iowrite32(dereg, hcr_base + DE);
  			iowrite32(cereg, hcr_base + CE);

  			dev_num = ffs(dereg) - 1;
  			if (dev_num < ap->nr_pmp_links && dereg != 0) {
  				link = &ap->pmp_link[dev_num];

  				ehi = &link->eh_info;
  				qc = ata_qc_from_tag(ap, link->active_tag);
  				/*
  				 * We should consider this as non fatal error,
                                   * and TF must be updated as done below.
  		                 */
  
  				err_mask |= AC_ERR_DEV;
  
  			} else {
  				err_mask |= AC_ERR_HSM;
  				action |= ATA_EH_HARDRESET;
  				freeze = 1;
  			}
  		} else {
  			dereg = ioread32(hcr_base + DE);
  			iowrite32(dereg, hcr_base + DE);
  			iowrite32(cereg, hcr_base + CE);
  
  			qc = ata_qc_from_tag(ap, link->active_tag);
  			/*
  			 * We should consider this as non fatal error,
                           * and TF must be updated as done below.
  	                */
  			err_mask |= AC_ERR_DEV;
  		}
  	}
  
  	/* record error info */

  	if (qc)

  		qc->err_mask |= err_mask;

  	else

  		ehi->err_mask |= err_mask;
  
  	ehi->action |= action;

  
  	/* freeze or abort */
  	if (freeze)
  		ata_port_freeze(ap);

  	else if (abort) {
  		if (qc)
  			ata_link_abort(qc->dev->link);
  		else
  			ata_port_abort(ap);
  	}

  }

  static void sata_fsl_host_intr(struct ata_port *ap)
  {
  	struct sata_fsl_host_priv *host_priv = ap->host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;

  	u32 hstatus, done_mask = 0;

  	struct ata_queued_cmd *qc;
  	u32 SError;

  	u32 tag;
  	u32 status_mask = INT_ON_ERROR;

  
  	hstatus = ioread32(hcr_base + HSTATUS);

  	sata_fsl_scr_read(&ap->link, SCR_ERROR, &SError);

  	/* Read command completed register */
  	done_mask = ioread32(hcr_base + CC);
  
  	/* Workaround for data length mismatch errata */
  	if (unlikely(hstatus & INT_ON_DATA_LENGTH_MISMATCH)) {
  		for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
  			qc = ata_qc_from_tag(ap, tag);
  			if (qc && ata_is_atapi(qc->tf.protocol)) {
  				u32 hcontrol;
  				/* Set HControl[27] to clear error registers */
  				hcontrol = ioread32(hcr_base + HCONTROL);
  				iowrite32(hcontrol | CLEAR_ERROR,
  						hcr_base + HCONTROL);
  
  				/* Clear HControl[27] */
  				iowrite32(hcontrol & ~CLEAR_ERROR,
  						hcr_base + HCONTROL);
  
  				/* Clear SError[E] bit */
  				sata_fsl_scr_write(&ap->link, SCR_ERROR,
  						SError);
  
  				/* Ignore fatal error and device error */
  				status_mask &= ~(INT_ON_SINGL_DEVICE_ERR
  						| INT_ON_FATAL_ERR);
  				break;
  			}
  		}
  	}

  	if (unlikely(SError & 0xFFFF0000)) {
  		DPRINTK("serror @host_intr : 0x%x
  ", SError);
  		sata_fsl_error_intr(ap);

  	}

  	if (unlikely(hstatus & status_mask)) {

  		DPRINTK("error interrupt!!
  ");
  		sata_fsl_error_intr(ap);
  		return;
  	}

  	VPRINTK("Status of all queues :
  ");

  	VPRINTK("done_mask/CC = 0x%x, CA = 0x%x, CE=0x%x,CQ=0x%x,apqa=0x%x
  ",
  		done_mask,

  		ioread32(hcr_base + CA),
  		ioread32(hcr_base + CE),
  		ioread32(hcr_base + CQ),
  		ap->qc_active);

  	if (done_mask & ap->qc_active) {

  		int i;

  		/* clear CC bit, this will also complete the interrupt */

  		iowrite32(done_mask, hcr_base + CC);

  
  		DPRINTK("Status of all queues :
  ");

  		DPRINTK("done_mask/CC = 0x%x, CA = 0x%x, CE=0x%x
  ",
  			done_mask, ioread32(hcr_base + CA),

  			ioread32(hcr_base + CE));
  
  		for (i = 0; i < SATA_FSL_QUEUE_DEPTH; i++) {

  			if (done_mask & (1 << i))

  				DPRINTK
  				    ("completing ncq cmd,tag=%d,CC=0x%x,CA=0x%x
  ",
  				     i, ioread32(hcr_base + CC),
  				     ioread32(hcr_base + CA));

  		}

  		ata_qc_complete_multiple(ap, ap->qc_active ^ done_mask);

  		return;

  	} else if ((ap->qc_active & (1 << ATA_TAG_INTERNAL))) {

  		iowrite32(1, hcr_base + CC);

  		qc = ata_qc_from_tag(ap, ATA_TAG_INTERNAL);

  		DPRINTK("completing non-ncq cmd, CC=0x%x
  ",
  			 ioread32(hcr_base + CC));

  		if (qc) {

  			ata_qc_complete(qc);

  		}

  	} else {
  		/* Spurious Interrupt!! */
  		DPRINTK("spurious interrupt!!, CC = 0x%x
  ",
  			ioread32(hcr_base + CC));

  		iowrite32(done_mask, hcr_base + CC);

  		return;
  	}
  }
  
  static irqreturn_t sata_fsl_interrupt(int irq, void *dev_instance)
  {
  	struct ata_host *host = dev_instance;
  	struct sata_fsl_host_priv *host_priv = host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;
  	u32 interrupt_enables;
  	unsigned handled = 0;
  	struct ata_port *ap;
  
  	/* ack. any pending IRQs for this controller/port */
  	interrupt_enables = ioread32(hcr_base + HSTATUS);
  	interrupt_enables &= 0x3F;
  
  	DPRINTK("interrupt status 0x%x
  ", interrupt_enables);
  
  	if (!interrupt_enables)
  		return IRQ_NONE;
  
  	spin_lock(&host->lock);
  
  	/* Assuming one port per host controller */
  
  	ap = host->ports[0];
  	if (ap) {
  		sata_fsl_host_intr(ap);
  	} else {

  		dev_warn(host->dev, "interrupt on disabled port 0
  ");

  	}
  
  	iowrite32(interrupt_enables, hcr_base + HSTATUS);
  	handled = 1;
  
  	spin_unlock(&host->lock);
  
  	return IRQ_RETVAL(handled);
  }
  
  /*
   * Multiple ports are represented by multiple SATA controllers with
   * one port per controller
   */
  static int sata_fsl_init_controller(struct ata_host *host)
  {
  	struct sata_fsl_host_priv *host_priv = host->private_data;
  	void __iomem *hcr_base = host_priv->hcr_base;
  	u32 temp;
  
  	/*
  	 * NOTE : We cannot bring the controller online before setting
  	 * the CHBA, hence main controller initialization is done as
  	 * part of the port_start() callback
  	 */

  	/* sata controller to operate in enterprise mode */
  	temp = ioread32(hcr_base + HCONTROL);
  	iowrite32(temp & ~HCONTROL_LEGACY, hcr_base + HCONTROL);

  	/* ack. any pending IRQs for this controller/port */
  	temp = ioread32(hcr_base + HSTATUS);
  	if (temp & 0x3F)
  		iowrite32((temp & 0x3F), hcr_base + HSTATUS);
  
  	/* Keep interrupts disabled on the controller */
  	temp = ioread32(hcr_base + HCONTROL);
  	iowrite32((temp & ~0x3F), hcr_base + HCONTROL);
  
  	/* Disable interrupt coalescing control(icc), for the moment */
  	DPRINTK("icc = 0x%x
  ", ioread32(hcr_base + ICC));
  	iowrite32(0x01000000, hcr_base + ICC);
  
  	/* clear error registers, SError is cleared by libATA  */
  	iowrite32(0x00000FFFF, hcr_base + CE);
  	iowrite32(0x00000FFFF, hcr_base + DE);

   	/*
  	 * reset the number of command complete bits which will cause the
  	 * interrupt to be signaled
  	 */
  	fsl_sata_set_irq_coalescing(host, intr_coalescing_count,
  			intr_coalescing_ticks);

  	/*
  	 * host controller will be brought on-line, during xx_port_start()
  	 * callback, that should also initiate the OOB, COMINIT sequence
  	 */
  
  	DPRINTK("HStatus = 0x%x
  ", ioread32(hcr_base + HSTATUS));
  	DPRINTK("HControl = 0x%x
  ", ioread32(hcr_base + HCONTROL));
  
  	return 0;
  }
  
  /*
   * scsi mid-layer and libata interface structures
   */
  static struct scsi_host_template sata_fsl_sht = {

  	ATA_NCQ_SHT("sata_fsl"),

  	.can_queue = SATA_FSL_QUEUE_DEPTH,

  	.sg_tablesize = SATA_FSL_MAX_PRD_USABLE,

  	.dma_boundary = ATA_DMA_BOUNDARY,

  };

  static struct ata_port_operations sata_fsl_ops = {
  	.inherits		= &sata_pmp_port_ops,

  	.qc_defer = ata_std_qc_defer,

  	.qc_prep = sata_fsl_qc_prep,
  	.qc_issue = sata_fsl_qc_issue,

  	.qc_fill_rtf = sata_fsl_qc_fill_rtf,

  
  	.scr_read = sata_fsl_scr_read,
  	.scr_write = sata_fsl_scr_write,
  
  	.freeze = sata_fsl_freeze,
  	.thaw = sata_fsl_thaw,

  	.softreset = sata_fsl_softreset,

  	.hardreset = sata_fsl_hardreset,

  	.pmp_softreset = sata_fsl_softreset,
  	.error_handler = sata_fsl_error_handler,

  	.post_internal_cmd = sata_fsl_post_internal_cmd,
  
  	.port_start = sata_fsl_port_start,
  	.port_stop = sata_fsl_port_stop,

  
  	.pmp_attach = sata_fsl_pmp_attach,
  	.pmp_detach = sata_fsl_pmp_detach,

  };
  
  static const struct ata_port_info sata_fsl_port_info[] = {
  	{
  	 .flags = SATA_FSL_HOST_FLAGS,

  	 .pio_mask = ATA_PIO4,
  	 .udma_mask = ATA_UDMA6,

  	 .port_ops = &sata_fsl_ops,
  	 },
  };

  static int sata_fsl_probe(struct platform_device *ofdev)

  {

  	int retval = -ENXIO;

  	void __iomem *hcr_base = NULL;
  	void __iomem *ssr_base = NULL;
  	void __iomem *csr_base = NULL;
  	struct sata_fsl_host_priv *host_priv = NULL;

  	int irq;

  	struct ata_host *host = NULL;

  	u32 temp;

  
  	struct ata_port_info pi = sata_fsl_port_info[0];
  	const struct ata_port_info *ppi[] = { &pi, NULL };

  	dev_info(&ofdev->dev, "Sata FSL Platform/CSB Driver init
  ");

  	hcr_base = of_iomap(ofdev->dev.of_node, 0);

  	if (!hcr_base)
  		goto error_exit_with_cleanup;
  
  	ssr_base = hcr_base + 0x100;
  	csr_base = hcr_base + 0x140;

  	if (!of_device_is_compatible(ofdev->dev.of_node, "fsl,mpc8315-sata")) {
  		temp = ioread32(csr_base + TRANSCFG);
  		temp = temp & 0xffffffe0;
  		iowrite32(temp | TRANSCFG_RX_WATER_MARK, csr_base + TRANSCFG);
  	}

  	DPRINTK("@reset i/o = 0x%x
  ", ioread32(csr_base + TRANSCFG));
  	DPRINTK("sizeof(cmd_desc) = %d
  ", sizeof(struct command_desc));
  	DPRINTK("sizeof(#define cmd_desc) = %d
  ", SATA_FSL_CMD_DESC_SIZE);
  
  	host_priv = kzalloc(sizeof(struct sata_fsl_host_priv), GFP_KERNEL);
  	if (!host_priv)
  		goto error_exit_with_cleanup;
  
  	host_priv->hcr_base = hcr_base;
  	host_priv->ssr_base = ssr_base;
  	host_priv->csr_base = csr_base;

  	irq = irq_of_parse_and_map(ofdev->dev.of_node, 0);

  	if (!irq) {

  		dev_err(&ofdev->dev, "invalid irq from platform
  ");

  		goto error_exit_with_cleanup;
  	}

  	host_priv->irq = irq;

  	if (of_device_is_compatible(ofdev->dev.of_node, "fsl,pq-sata-v2"))
  		host_priv->data_snoop = DATA_SNOOP_ENABLE_V2;
  	else
  		host_priv->data_snoop = DATA_SNOOP_ENABLE_V1;

  	/* allocate host structure */
  	host = ata_host_alloc_pinfo(&ofdev->dev, ppi, SATA_FSL_MAX_PORTS);

  	if (!host) {
  		retval = -ENOMEM;
  		goto error_exit_with_cleanup;
  	}

  
  	/* host->iomap is not used currently */
  	host->private_data = host_priv;

  	/* initialize host controller */
  	sata_fsl_init_controller(host);
  
  	/*
  	 * 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_fsl_interrupt, SATA_FSL_IRQ_FLAG,
  			  &sata_fsl_sht);

  	host_priv->intr_coalescing.show = fsl_sata_intr_coalescing_show;
  	host_priv->intr_coalescing.store = fsl_sata_intr_coalescing_store;
  	sysfs_attr_init(&host_priv->intr_coalescing.attr);
  	host_priv->intr_coalescing.attr.name = "intr_coalescing";
  	host_priv->intr_coalescing.attr.mode = S_IRUGO | S_IWUSR;
  	retval = device_create_file(host->dev, &host_priv->intr_coalescing);
  	if (retval)
  		goto error_exit_with_cleanup;

  	host_priv->rx_watermark.show = fsl_sata_rx_watermark_show;
  	host_priv->rx_watermark.store = fsl_sata_rx_watermark_store;
  	sysfs_attr_init(&host_priv->rx_watermark.attr);
  	host_priv->rx_watermark.attr.name = "rx_watermark";
  	host_priv->rx_watermark.attr.mode = S_IRUGO | S_IWUSR;
  	retval = device_create_file(host->dev, &host_priv->rx_watermark);
  	if (retval) {
  		device_remove_file(&ofdev->dev, &host_priv->intr_coalescing);
  		goto error_exit_with_cleanup;
  	}

  	return 0;
  
  error_exit_with_cleanup:

  	if (host)

  		ata_host_detach(host);

  	if (hcr_base)
  		iounmap(hcr_base);

  	kfree(host_priv);

  
  	return retval;
  }

  static int sata_fsl_remove(struct platform_device *ofdev)

  {

  	struct ata_host *host = platform_get_drvdata(ofdev);

  	struct sata_fsl_host_priv *host_priv = host->private_data;

  	device_remove_file(&ofdev->dev, &host_priv->intr_coalescing);

  	device_remove_file(&ofdev->dev, &host_priv->rx_watermark);

  	ata_host_detach(host);

  	irq_dispose_mapping(host_priv->irq);

  	iounmap(host_priv->hcr_base);
  	kfree(host_priv);
  
  	return 0;
  }

  #ifdef CONFIG_PM_SLEEP

  static int sata_fsl_suspend(struct platform_device *op, pm_message_t state)

  {

  	struct ata_host *host = platform_get_drvdata(op);

  	return ata_host_suspend(host, state);
  }

  static int sata_fsl_resume(struct platform_device *op)

  {

  	struct ata_host *host = platform_get_drvdata(op);

  	struct sata_fsl_host_priv *host_priv = host->private_data;
  	int ret;
  	void __iomem *hcr_base = host_priv->hcr_base;
  	struct ata_port *ap = host->ports[0];
  	struct sata_fsl_port_priv *pp = ap->private_data;
  
  	ret = sata_fsl_init_controller(host);
  	if (ret) {

  		dev_err(&op->dev, "Error initializing hardware
  ");

  		return ret;
  	}
  
  	/* Recovery the CHBA register in host controller cmd register set */
  	iowrite32(pp->cmdslot_paddr & 0xffffffff, hcr_base + CHBA);

  	iowrite32((ioread32(hcr_base + HCONTROL)
  				| HCONTROL_ONLINE_PHY_RST
  				| HCONTROL_SNOOP_ENABLE
  				| HCONTROL_PMP_ATTACHED),
  			hcr_base + HCONTROL);

  	ata_host_resume(host);
  	return 0;
  }
  #endif

  static const struct of_device_id fsl_sata_match[] = {

  	{

  		.compatible = "fsl,pq-sata",

  	},

  	{
  		.compatible = "fsl,pq-sata-v2",
  	},

  	{},
  };
  
  MODULE_DEVICE_TABLE(of, fsl_sata_match);

  static struct platform_driver fsl_sata_driver = {

  	.driver = {
  		.name = "fsl-sata",

  		.of_match_table = fsl_sata_match,
  	},

  	.probe		= sata_fsl_probe,
  	.remove		= sata_fsl_remove,

  #ifdef CONFIG_PM_SLEEP

  	.suspend	= sata_fsl_suspend,
  	.resume		= sata_fsl_resume,
  #endif

  };

  module_platform_driver(fsl_sata_driver);

  
  MODULE_LICENSE("GPL");
  MODULE_AUTHOR("Ashish Kalra, Freescale Semiconductor");
  MODULE_DESCRIPTION("Freescale 3.0Gbps SATA controller low level driver");
  MODULE_VERSION("1.10");