Merge branch 'upstream'

1 files changed, 954 insertions, 192 deletions

diff --git a/drivers/scsi/sata_mv.c b/drivers/scsi/sata_mv.c
index b8f1f6963179..e72140342d05 100644
--- a/drivers/scsi/sata_mv.c
+++ b/drivers/scsi/sata_mv.c
@@ -35,7 +35,7 @@
 #include <asm/io.h>
 
 #define DRV_NAME	"sata_mv"
-#define DRV_VERSION	"0.12"
+#define DRV_VERSION	"0.24"
 
 enum {
 	/* BAR's are enumerated in terms of pci_resource_start() terms */
@@ -55,31 +55,62 @@ enum {
 	MV_SATAHC_ARBTR_REG_SZ	= MV_MINOR_REG_AREA_SZ,		/* arbiter */
 	MV_PORT_REG_SZ		= MV_MINOR_REG_AREA_SZ,
 
-	MV_Q_CT			= 32,
-	MV_CRQB_SZ		= 32,
-	MV_CRPB_SZ		= 8,
+	MV_USE_Q_DEPTH		= ATA_DEF_QUEUE,
 
-	MV_DMA_BOUNDARY		= 0xffffffffU,
-	SATAHC_MASK		= (~(MV_SATAHC_REG_SZ - 1)),
+	MV_MAX_Q_DEPTH		= 32,
+	MV_MAX_Q_DEPTH_MASK	= MV_MAX_Q_DEPTH - 1,
+
+	/* CRQB needs alignment on a 1KB boundary. Size == 1KB
+	 * CRPB needs alignment on a 256B boundary. Size == 256B
+	 * SG count of 176 leads to MV_PORT_PRIV_DMA_SZ == 4KB
+	 * ePRD (SG) entries need alignment on a 16B boundary. Size == 16B
+	 */
+	MV_CRQB_Q_SZ		= (32 * MV_MAX_Q_DEPTH),
+	MV_CRPB_Q_SZ		= (8 * MV_MAX_Q_DEPTH),
+	MV_MAX_SG_CT		= 176,
+	MV_SG_TBL_SZ		= (16 * MV_MAX_SG_CT),
+	MV_PORT_PRIV_DMA_SZ	= (MV_CRQB_Q_SZ + MV_CRPB_Q_SZ + MV_SG_TBL_SZ),
+
+	/* Our DMA boundary is determined by an ePRD being unable to handle
+	 * anything larger than 64KB
+	 */
+	MV_DMA_BOUNDARY		= 0xffffU,
 
 	MV_PORTS_PER_HC		= 4,
 	/* == (port / MV_PORTS_PER_HC) to determine HC from 0-7 port */
 	MV_PORT_HC_SHIFT	= 2,
-	/* == (port % MV_PORTS_PER_HC) to determine port from 0-7 port */
+	/* == (port % MV_PORTS_PER_HC) to determine hard port from 0-7 port */
 	MV_PORT_MASK		= 3,
 
 	/* Host Flags */
 	MV_FLAG_DUAL_HC		= (1 << 30),  /* two SATA Host Controllers */
 	MV_FLAG_IRQ_COALESCE	= (1 << 29),  /* IRQ coalescing capability */
-	MV_FLAG_BDMA		= (1 << 28),  /* Basic DMA */
+	MV_FLAG_GLBL_SFT_RST	= (1 << 28),  /* Global Soft Reset support */
+	MV_COMMON_FLAGS		= (ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				   ATA_FLAG_SATA_RESET | ATA_FLAG_MMIO |
+				   ATA_FLAG_PIO_POLLING),
+	MV_6XXX_FLAGS		= (MV_FLAG_IRQ_COALESCE | 
+				   MV_FLAG_GLBL_SFT_RST),
 
 	chip_504x		= 0,
 	chip_508x		= 1,
 	chip_604x		= 2,
 	chip_608x		= 3,
 
+	CRQB_FLAG_READ		= (1 << 0),
+	CRQB_TAG_SHIFT		= 1,
+	CRQB_CMD_ADDR_SHIFT	= 8,
+	CRQB_CMD_CS		= (0x2 << 11),
+	CRQB_CMD_LAST		= (1 << 15),
+
+	CRPB_FLAG_STATUS_SHIFT	= 8,
+
+	EPRD_FLAG_END_OF_TBL	= (1 << 31),
+
 	/* PCI interface registers */
 
+	PCI_COMMAND_OFS		= 0xc00,
+
 	PCI_MAIN_CMD_STS_OFS	= 0xd30,
 	STOP_PCI_MASTER		= (1 << 2),
 	PCI_MASTER_EMPTY	= (1 << 3),
@@ -111,20 +142,13 @@ enum {
 	HC_CFG_OFS		= 0,
 
 	HC_IRQ_CAUSE_OFS	= 0x14,
-	CRBP_DMA_DONE		= (1 << 0),	/* shift by port # */
+	CRPB_DMA_DONE		= (1 << 0),	/* shift by port # */
 	HC_IRQ_COAL		= (1 << 4),	/* IRQ coalescing */
 	DEV_IRQ			= (1 << 8),	/* shift by port # */
 
 	/* Shadow block registers */
-	SHD_PIO_DATA_OFS	= 0x100,
-	SHD_FEA_ERR_OFS		= 0x104,
-	SHD_SECT_CNT_OFS	= 0x108,
-	SHD_LBA_L_OFS		= 0x10C,
-	SHD_LBA_M_OFS		= 0x110,
-	SHD_LBA_H_OFS		= 0x114,
-	SHD_DEV_HD_OFS		= 0x118,
-	SHD_CMD_STA_OFS		= 0x11C,
-	SHD_CTL_AST_OFS		= 0x120,
+	SHD_BLK_OFS		= 0x100,
+	SHD_CTL_AST_OFS		= 0x20,		/* ofs from SHD_BLK_OFS */
 
 	/* SATA registers */
 	SATA_STATUS_OFS		= 0x300,  /* ctrl, err regs follow status */
@@ -132,6 +156,11 @@ enum {
 
 	/* Port registers */
 	EDMA_CFG_OFS		= 0,
+	EDMA_CFG_Q_DEPTH	= 0,			/* queueing disabled */
+	EDMA_CFG_NCQ		= (1 << 5),
+	EDMA_CFG_NCQ_GO_ON_ERR	= (1 << 14),		/* continue on error */
+	EDMA_CFG_RD_BRST_EXT	= (1 << 11),		/* read burst 512B */
+	EDMA_CFG_WR_BUFF_LEN	= (1 << 13),		/* write buffer 512B */
 
 	EDMA_ERR_IRQ_CAUSE_OFS	= 0x8,
 	EDMA_ERR_IRQ_MASK_OFS	= 0xc,
@@ -161,33 +190,85 @@ enum {
 				   EDMA_ERR_LNK_DATA_TX | 
 				   EDMA_ERR_TRANS_PROTO),
 
+	EDMA_REQ_Q_BASE_HI_OFS	= 0x10,
+	EDMA_REQ_Q_IN_PTR_OFS	= 0x14,		/* also contains BASE_LO */
+	EDMA_REQ_Q_BASE_LO_MASK	= 0xfffffc00U,
+
+	EDMA_REQ_Q_OUT_PTR_OFS	= 0x18,
+	EDMA_REQ_Q_PTR_SHIFT	= 5,
+
+	EDMA_RSP_Q_BASE_HI_OFS	= 0x1c,
+	EDMA_RSP_Q_IN_PTR_OFS	= 0x20,
+	EDMA_RSP_Q_OUT_PTR_OFS	= 0x24,		/* also contains BASE_LO */
+	EDMA_RSP_Q_BASE_LO_MASK	= 0xffffff00U,
+	EDMA_RSP_Q_PTR_SHIFT	= 3,
+
 	EDMA_CMD_OFS		= 0x28,
 	EDMA_EN			= (1 << 0),
 	EDMA_DS			= (1 << 1),
 	ATA_RST			= (1 << 2),
 
-	/* BDMA is 6xxx part only */
-	BDMA_CMD_OFS		= 0x224,
-	BDMA_START		= (1 << 0),
+	/* Host private flags (hp_flags) */
+	MV_HP_FLAG_MSI		= (1 << 0),
 
-	MV_UNDEF		= 0,
+	/* Port private flags (pp_flags) */
+	MV_PP_FLAG_EDMA_EN	= (1 << 0),
+	MV_PP_FLAG_EDMA_DS_ACT	= (1 << 1),
 };
 
-struct mv_port_priv {
+/* Command ReQuest Block: 32B */
+struct mv_crqb {
+	u32			sg_addr;
+	u32			sg_addr_hi;
+	u16			ctrl_flags;
+	u16			ata_cmd[11];
+};
 
+/* Command ResPonse Block: 8B */
+struct mv_crpb {
+	u16			id;
+	u16			flags;
+	u32			tmstmp;
 };
 
-struct mv_host_priv {
+/* EDMA Physical Region Descriptor (ePRD); A.K.A. SG */
+struct mv_sg {
+	u32			addr;
+	u32			flags_size;
+	u32			addr_hi;
+	u32			reserved;
+};
 
+struct mv_port_priv {
+	struct mv_crqb		*crqb;
+	dma_addr_t		crqb_dma;
+	struct mv_crpb		*crpb;
+	dma_addr_t		crpb_dma;
+	struct mv_sg		*sg_tbl;
+	dma_addr_t		sg_tbl_dma;
+
+	unsigned		req_producer;		/* cp of req_in_ptr */
+	unsigned		rsp_consumer;		/* cp of rsp_out_ptr */
+	u32			pp_flags;
+};
+
+struct mv_host_priv {
+	u32			hp_flags;
 };
 
 static void mv_irq_clear(struct ata_port *ap);
 static u32 mv_scr_read(struct ata_port *ap, unsigned int sc_reg_in);
 static void mv_scr_write(struct ata_port *ap, unsigned int sc_reg_in, u32 val);
+static u8 mv_check_err(struct ata_port *ap);
 static void mv_phy_reset(struct ata_port *ap);
-static int mv_master_reset(void __iomem *mmio_base);
+static void mv_host_stop(struct ata_host_set *host_set);
+static int mv_port_start(struct ata_port *ap);
+static void mv_port_stop(struct ata_port *ap);
+static void mv_qc_prep(struct ata_queued_cmd *qc);
+static int mv_qc_issue(struct ata_queued_cmd *qc);
 static irqreturn_t mv_interrupt(int irq, void *dev_instance,
 				struct pt_regs *regs);
+static void mv_eng_timeout(struct ata_port *ap);
 static int mv_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
 
 static Scsi_Host_Template mv_sht = {
@@ -196,13 +277,13 @@ static Scsi_Host_Template mv_sht = {
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
 	.eh_strategy_handler	= ata_scsi_error,
-	.can_queue		= ATA_DEF_QUEUE,
+	.can_queue		= MV_USE_Q_DEPTH,
 	.this_id		= ATA_SHT_THIS_ID,
-	.sg_tablesize		= MV_UNDEF,
+	.sg_tablesize		= MV_MAX_SG_CT,
 	.max_sectors		= ATA_MAX_SECTORS,
 	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
 	.emulated		= ATA_SHT_EMULATED,
-	.use_clustering		= MV_UNDEF,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
 	.proc_name		= DRV_NAME,
 	.dma_boundary		= MV_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
@@ -216,15 +297,16 @@ static struct ata_port_operations mv_ops = {
 	.tf_load		= ata_tf_load,
 	.tf_read		= ata_tf_read,
 	.check_status		= ata_check_status,
+	.check_err		= mv_check_err,
 	.exec_command		= ata_exec_command,
 	.dev_select		= ata_std_dev_select,
 
 	.phy_reset		= mv_phy_reset,
 
-	.qc_prep		= ata_qc_prep,
-	.qc_issue		= ata_qc_issue_prot,
+	.qc_prep		= mv_qc_prep,
+	.qc_issue		= mv_qc_issue,
 
-	.eng_timeout		= ata_eng_timeout,
+	.eng_timeout		= mv_eng_timeout,
 
 	.irq_handler		= mv_interrupt,
 	.irq_clear		= mv_irq_clear,
@@ -232,49 +314,39 @@ static struct ata_port_operations mv_ops = {
 	.scr_read		= mv_scr_read,
 	.scr_write		= mv_scr_write,
 
-	.port_start		= ata_port_start,
-	.port_stop		= ata_port_stop,
-	.host_stop		= ata_host_stop,
+	.port_start		= mv_port_start,
+	.port_stop		= mv_port_stop,
+	.host_stop		= mv_host_stop,
 };
 
 static struct ata_port_info mv_port_info[] = {
 	{  /* chip_504x */
 		.sht		= &mv_sht,
-		.host_flags	= (ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
-				   ATA_FLAG_SATA_RESET | ATA_FLAG_MMIO |
-				   ATA_FLAG_PIO_POLLING),
-		.pio_mask	= 0x1f,	/* pio4-0 */
-		.udma_mask	= 0,	/* 0x7f (udma6-0 disabled for now) */
+		.host_flags	= MV_COMMON_FLAGS,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.udma_mask	= 0,	/* 0x7f (udma0-6 disabled for now) */
 		.port_ops	= &mv_ops,
 	},
 	{  /* chip_508x */
 		.sht		= &mv_sht,
-		.host_flags	= (ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
-				   ATA_FLAG_SATA_RESET | ATA_FLAG_MMIO | 
-				   ATA_FLAG_PIO_POLLING | MV_FLAG_DUAL_HC),
-		.pio_mask	= 0x1f,	/* pio4-0 */
-		.udma_mask	= 0,	/* 0x7f (udma6-0 disabled for now) */
+		.host_flags	= (MV_COMMON_FLAGS | MV_FLAG_DUAL_HC),
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.udma_mask	= 0,	/* 0x7f (udma0-6 disabled for now) */
 		.port_ops	= &mv_ops,
 	},
 	{  /* chip_604x */
 		.sht		= &mv_sht,
-		.host_flags	= (ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
-				   ATA_FLAG_SATA_RESET | ATA_FLAG_MMIO | 
-				   ATA_FLAG_PIO_POLLING |
-				   MV_FLAG_IRQ_COALESCE | MV_FLAG_BDMA),
-		.pio_mask	= 0x1f,	/* pio4-0 */
-		.udma_mask	= 0,	/* 0x7f (udma6-0 disabled for now) */
+		.host_flags	= (MV_COMMON_FLAGS | MV_6XXX_FLAGS),
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
 		.port_ops	= &mv_ops,
 	},
 	{  /* chip_608x */
 		.sht		= &mv_sht,
-		.host_flags	= (ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
-				   ATA_FLAG_SATA_RESET | ATA_FLAG_MMIO |
-				   ATA_FLAG_PIO_POLLING |
-				   MV_FLAG_IRQ_COALESCE | MV_FLAG_DUAL_HC |
-				   MV_FLAG_BDMA),
-		.pio_mask	= 0x1f,	/* pio4-0 */
-		.udma_mask	= 0,	/* 0x7f (udma6-0 disabled for now) */
+		.host_flags	= (MV_COMMON_FLAGS | MV_6XXX_FLAGS | 
+				   MV_FLAG_DUAL_HC),
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
 		.port_ops	= &mv_ops,
 	},
 };
@@ -309,12 +381,6 @@ static inline void writelfl(unsigned long data, void __iomem *addr)
 	(void) readl(addr);	/* flush to avoid PCI posted write */
 }
 
-static inline void __iomem *mv_port_addr_to_hc_base(void __iomem *port_mmio)
-{
-	return ((void __iomem *)((unsigned long)port_mmio & 
-				 (unsigned long)SATAHC_MASK));
-}
-
 static inline void __iomem *mv_hc_base(void __iomem *base, unsigned int hc)
 {
 	return (base + MV_SATAHC0_REG_BASE + (hc * MV_SATAHC_REG_SZ));
@@ -332,24 +398,150 @@ static inline void __iomem *mv_ap_base(struct ata_port *ap)
 	return mv_port_base(ap->host_set->mmio_base, ap->port_no);
 }
 
-static inline int mv_get_hc_count(unsigned long flags)
+static inline int mv_get_hc_count(unsigned long hp_flags)
+{
+	return ((hp_flags & MV_FLAG_DUAL_HC) ? 2 : 1);
+}
+
+static void mv_irq_clear(struct ata_port *ap)
+{
+}
+
+/**
+ *      mv_start_dma - Enable eDMA engine
+ *      @base: port base address
+ *      @pp: port private data
+ *
+ *      Verify the local cache of the eDMA state is accurate with an
+ *      assert.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_start_dma(void __iomem *base, struct mv_port_priv *pp)
 {
-	return ((flags & MV_FLAG_DUAL_HC) ? 2 : 1);
+	if (!(MV_PP_FLAG_EDMA_EN & pp->pp_flags)) {
+		writelfl(EDMA_EN, base + EDMA_CMD_OFS);
+		pp->pp_flags |= MV_PP_FLAG_EDMA_EN;
+	}
+	assert(EDMA_EN & readl(base + EDMA_CMD_OFS));
 }
 
-static inline int mv_is_edma_active(struct ata_port *ap)
+/**
+ *      mv_stop_dma - Disable eDMA engine
+ *      @ap: ATA channel to manipulate
+ *
+ *      Verify the local cache of the eDMA state is accurate with an
+ *      assert.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_stop_dma(struct ata_port *ap)
 {
 	void __iomem *port_mmio = mv_ap_base(ap);
-	return (EDMA_EN & readl(port_mmio + EDMA_CMD_OFS));
+	struct mv_port_priv *pp	= ap->private_data;
+	u32 reg;
+	int i;
+
+	if (MV_PP_FLAG_EDMA_EN & pp->pp_flags) {
+		/* Disable EDMA if active.   The disable bit auto clears.
+		 */
+		writelfl(EDMA_DS, port_mmio + EDMA_CMD_OFS);
+		pp->pp_flags &= ~MV_PP_FLAG_EDMA_EN;
+	} else {
+		assert(!(EDMA_EN & readl(port_mmio + EDMA_CMD_OFS)));
+  	}
+	
+	/* now properly wait for the eDMA to stop */
+	for (i = 1000; i > 0; i--) {
+		reg = readl(port_mmio + EDMA_CMD_OFS);
+		if (!(EDMA_EN & reg)) {
+			break;
+		}
+		udelay(100);
+	}
+
+	if (EDMA_EN & reg) {
+		printk(KERN_ERR "ata%u: Unable to stop eDMA\n", ap->id);
+		/* FIXME: Consider doing a reset here to recover */
+	}
 }
 
-static inline int mv_port_bdma_capable(struct ata_port *ap)
+#ifdef ATA_DEBUG
+static void mv_dump_mem(void __iomem *start, unsigned bytes)
 {
-	return (ap->flags & MV_FLAG_BDMA);
+	int b, w;
+	for (b = 0; b < bytes; ) {
+		DPRINTK("%p: ", start + b);
+		for (w = 0; b < bytes && w < 4; w++) {
+			printk("%08x ",readl(start + b));
+			b += sizeof(u32);
+		}
+		printk("\n");
+	}
 }
+#endif
 
-static void mv_irq_clear(struct ata_port *ap)
+static void mv_dump_pci_cfg(struct pci_dev *pdev, unsigned bytes)
+{
+#ifdef ATA_DEBUG
+	int b, w;
+	u32 dw;
+	for (b = 0; b < bytes; ) {
+		DPRINTK("%02x: ", b);
+		for (w = 0; b < bytes && w < 4; w++) {
+			(void) pci_read_config_dword(pdev,b,&dw);
+			printk("%08x ",dw);
+			b += sizeof(u32);
+		}
+		printk("\n");
+	}
+#endif
+}
+static void mv_dump_all_regs(void __iomem *mmio_base, int port,
+			     struct pci_dev *pdev)
 {
+#ifdef ATA_DEBUG
+	void __iomem *hc_base = mv_hc_base(mmio_base, 
+					   port >> MV_PORT_HC_SHIFT);
+	void __iomem *port_base;
+	int start_port, num_ports, p, start_hc, num_hcs, hc;
+
+	if (0 > port) {
+		start_hc = start_port = 0;
+		num_ports = 8;		/* shld be benign for 4 port devs */
+		num_hcs = 2;
+	} else {
+		start_hc = port >> MV_PORT_HC_SHIFT;
+		start_port = port;
+		num_ports = num_hcs = 1;
+	}
+	DPRINTK("All registers for port(s) %u-%u:\n", start_port, 
+		num_ports > 1 ? num_ports - 1 : start_port);
+
+	if (NULL != pdev) {
+		DPRINTK("PCI config space regs:\n");
+		mv_dump_pci_cfg(pdev, 0x68);
+	}
+	DPRINTK("PCI regs:\n");
+	mv_dump_mem(mmio_base+0xc00, 0x3c);
+	mv_dump_mem(mmio_base+0xd00, 0x34);
+	mv_dump_mem(mmio_base+0xf00, 0x4);
+	mv_dump_mem(mmio_base+0x1d00, 0x6c);
+	for (hc = start_hc; hc < start_hc + num_hcs; hc++) {
+		hc_base = mv_hc_base(mmio_base, port >> MV_PORT_HC_SHIFT);
+		DPRINTK("HC regs (HC %i):\n", hc);
+		mv_dump_mem(hc_base, 0x1c);
+	}
+	for (p = start_port; p < start_port + num_ports; p++) {
+		port_base = mv_port_base(mmio_base, p);
+		DPRINTK("EDMA regs (port %i):\n",p);
+		mv_dump_mem(port_base, 0x54);
+		DPRINTK("SATA regs (port %i):\n",p);
+		mv_dump_mem(port_base+0x300, 0x60);
+	}
+#endif
 }
 
 static unsigned int mv_scr_offset(unsigned int sc_reg_in)
@@ -392,30 +584,37 @@ static void mv_scr_write(struct ata_port *ap, unsigned int sc_reg_in, u32 val)
 	}
 }
 
-static int mv_master_reset(void __iomem *mmio_base)
+/**
+ *      mv_global_soft_reset - Perform the 6xxx global soft reset
+ *      @mmio_base: base address of the HBA
+ *
+ *      This routine only applies to 6xxx parts.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static int mv_global_soft_reset(void __iomem *mmio_base)
 {
 	void __iomem *reg = mmio_base + PCI_MAIN_CMD_STS_OFS;
 	int i, rc = 0;
 	u32 t;
 
-	VPRINTK("ENTER\n");
-
 	/* Following procedure defined in PCI "main command and status
 	 * register" table.
 	 */
 	t = readl(reg);
 	writel(t | STOP_PCI_MASTER, reg);
 
-	for (i = 0; i < 100; i++) {
-		msleep(10);
+	for (i = 0; i < 1000; i++) {
+		udelay(1);
 		t = readl(reg);
 		if (PCI_MASTER_EMPTY & t) {
 			break;
 		}
 	}
 	if (!(PCI_MASTER_EMPTY & t)) {
-		printk(KERN_ERR DRV_NAME "PCI master won't flush\n");
-		rc = 1;		/* broken HW? */
+		printk(KERN_ERR DRV_NAME ": PCI master won't flush\n");
+		rc = 1;
 		goto done;
 	}
 
@@ -428,39 +627,398 @@ static int mv_master_reset(void __iomem *mmio_base)
 	} while (!(GLOB_SFT_RST & t) && (i-- > 0));
 
 	if (!(GLOB_SFT_RST & t)) {
-		printk(KERN_ERR DRV_NAME "can't set global reset\n");
-		rc = 1;		/* broken HW? */
+		printk(KERN_ERR DRV_NAME ": can't set global reset\n");
+		rc = 1;
 		goto done;
 	}
 
-	/* clear reset */
+	/* clear reset and *reenable the PCI master* (not mentioned in spec) */
 	i = 5;
 	do {
-		writel(t & ~GLOB_SFT_RST, reg);
+		writel(t & ~(GLOB_SFT_RST | STOP_PCI_MASTER), reg);
 		t = readl(reg);
 		udelay(1);
 	} while ((GLOB_SFT_RST & t) && (i-- > 0));
 
 	if (GLOB_SFT_RST & t) {
-		printk(KERN_ERR DRV_NAME "can't clear global reset\n");
-		rc = 1;		/* broken HW? */
+		printk(KERN_ERR DRV_NAME ": can't clear global reset\n");
+		rc = 1;
 	}
-
- done:
-	VPRINTK("EXIT, rc = %i\n", rc);
+done:
 	return rc;
 }
 
-static void mv_err_intr(struct ata_port *ap)
+/**
+ *      mv_host_stop - Host specific cleanup/stop routine.
+ *      @host_set: host data structure
+ *
+ *      Disable ints, cleanup host memory, call general purpose
+ *      host_stop.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_host_stop(struct ata_host_set *host_set)
 {
-	void __iomem *port_mmio;
-	u32 edma_err_cause, serr = 0;
+	struct mv_host_priv *hpriv = host_set->private_data;
+	struct pci_dev *pdev = to_pci_dev(host_set->dev);
+
+	if (hpriv->hp_flags & MV_HP_FLAG_MSI) {
+		pci_disable_msi(pdev);
+	} else {
+		pci_intx(pdev, 0);
+	}
+	kfree(hpriv);
+	ata_host_stop(host_set);
+}
 
-	/* bug here b/c we got an err int on a port we don't know about,
-	 * so there's no way to clear it
+/**
+ *      mv_port_start - Port specific init/start routine.
+ *      @ap: ATA channel to manipulate
+ *
+ *      Allocate and point to DMA memory, init port private memory,
+ *      zero indices.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static int mv_port_start(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct mv_port_priv *pp;
+	void __iomem *port_mmio = mv_ap_base(ap);
+	void *mem;
+	dma_addr_t mem_dma;
+
+	pp = kmalloc(sizeof(*pp), GFP_KERNEL);
+	if (!pp) {
+		return -ENOMEM;
+	}
+	memset(pp, 0, sizeof(*pp));
+
+	mem = dma_alloc_coherent(dev, MV_PORT_PRIV_DMA_SZ, &mem_dma, 
+				 GFP_KERNEL);
+	if (!mem) {
+		kfree(pp);
+		return -ENOMEM;
+	}
+	memset(mem, 0, MV_PORT_PRIV_DMA_SZ);
+
+	/* First item in chunk of DMA memory: 
+	 * 32-slot command request table (CRQB), 32 bytes each in size
 	 */
-	BUG_ON(NULL == ap);
-	port_mmio = mv_ap_base(ap);
+	pp->crqb = mem;
+	pp->crqb_dma = mem_dma;
+	mem += MV_CRQB_Q_SZ;
+	mem_dma += MV_CRQB_Q_SZ;
+
+	/* Second item: 
+	 * 32-slot command response table (CRPB), 8 bytes each in size
+	 */
+	pp->crpb = mem;
+	pp->crpb_dma = mem_dma;
+	mem += MV_CRPB_Q_SZ;
+	mem_dma += MV_CRPB_Q_SZ;
+
+	/* Third item:
+	 * Table of scatter-gather descriptors (ePRD), 16 bytes each
+	 */
+	pp->sg_tbl = mem;
+	pp->sg_tbl_dma = mem_dma;
+
+	writelfl(EDMA_CFG_Q_DEPTH | EDMA_CFG_RD_BRST_EXT | 
+		 EDMA_CFG_WR_BUFF_LEN, port_mmio + EDMA_CFG_OFS);
+
+	writel((pp->crqb_dma >> 16) >> 16, port_mmio + EDMA_REQ_Q_BASE_HI_OFS);
+	writelfl(pp->crqb_dma & EDMA_REQ_Q_BASE_LO_MASK, 
+		 port_mmio + EDMA_REQ_Q_IN_PTR_OFS);
+
+	writelfl(0, port_mmio + EDMA_REQ_Q_OUT_PTR_OFS);
+	writelfl(0, port_mmio + EDMA_RSP_Q_IN_PTR_OFS);
+
+	writel((pp->crpb_dma >> 16) >> 16, port_mmio + EDMA_RSP_Q_BASE_HI_OFS);
+	writelfl(pp->crpb_dma & EDMA_RSP_Q_BASE_LO_MASK, 
+		 port_mmio + EDMA_RSP_Q_OUT_PTR_OFS);
+
+	pp->req_producer = pp->rsp_consumer = 0;
+
+	/* Don't turn on EDMA here...do it before DMA commands only.  Else
+	 * we'll be unable to send non-data, PIO, etc due to restricted access
+	 * to shadow regs.
+	 */
+	ap->private_data = pp;
+	return 0;
+}
+
+/**
+ *      mv_port_stop - Port specific cleanup/stop routine.
+ *      @ap: ATA channel to manipulate
+ *
+ *      Stop DMA, cleanup port memory.
+ *
+ *      LOCKING:
+ *      This routine uses the host_set lock to protect the DMA stop.
+ */
+static void mv_port_stop(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct mv_port_priv *pp = ap->private_data;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ap->host_set->lock, flags);
+	mv_stop_dma(ap);
+	spin_unlock_irqrestore(&ap->host_set->lock, flags);
+
+	ap->private_data = NULL;
+	dma_free_coherent(dev, MV_PORT_PRIV_DMA_SZ, pp->crpb, pp->crpb_dma);
+	kfree(pp);
+}
+
+/**
+ *      mv_fill_sg - Fill out the Marvell ePRD (scatter gather) entries
+ *      @qc: queued command whose SG list to source from
+ *
+ *      Populate the SG list and mark the last entry.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_fill_sg(struct ata_queued_cmd *qc)
+{
+	struct mv_port_priv *pp = qc->ap->private_data;
+	unsigned int i;
+
+	for (i = 0; i < qc->n_elem; i++) {
+		u32 sg_len;
+		dma_addr_t addr;
+
+		addr = sg_dma_address(&qc->sg[i]);
+		sg_len = sg_dma_len(&qc->sg[i]);
+
+		pp->sg_tbl[i].addr = cpu_to_le32(addr & 0xffffffff);
+		pp->sg_tbl[i].addr_hi = cpu_to_le32((addr >> 16) >> 16);
+		assert(0 == (sg_len & ~MV_DMA_BOUNDARY));
+		pp->sg_tbl[i].flags_size = cpu_to_le32(sg_len);
+	}
+	if (0 < qc->n_elem) {
+		pp->sg_tbl[qc->n_elem - 1].flags_size |= EPRD_FLAG_END_OF_TBL;
+	}
+}
+
+static inline unsigned mv_inc_q_index(unsigned *index)
+{
+	*index = (*index + 1) & MV_MAX_Q_DEPTH_MASK;
+	return *index;
+}
+
+static inline void mv_crqb_pack_cmd(u16 *cmdw, u8 data, u8 addr, unsigned last)
+{
+	*cmdw = data | (addr << CRQB_CMD_ADDR_SHIFT) | CRQB_CMD_CS |
+		(last ? CRQB_CMD_LAST : 0);
+}
+
+/**
+ *      mv_qc_prep - Host specific command preparation.
+ *      @qc: queued command to prepare
+ *
+ *      This routine simply redirects to the general purpose routine
+ *      if command is not DMA.  Else, it handles prep of the CRQB
+ *      (command request block), does some sanity checking, and calls
+ *      the SG load routine.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_qc_prep(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct mv_port_priv *pp = ap->private_data;
+	u16 *cw;
+	struct ata_taskfile *tf;
+	u16 flags = 0;
+
+ 	if (ATA_PROT_DMA != qc->tf.protocol) {
+		return;
+	}
+
+	/* the req producer index should be the same as we remember it */
+	assert(((readl(mv_ap_base(qc->ap) + EDMA_REQ_Q_IN_PTR_OFS) >> 
+		 EDMA_REQ_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK) ==
+	       pp->req_producer);
+
+	/* Fill in command request block
+	 */
+	if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
+		flags |= CRQB_FLAG_READ;
+	}
+	assert(MV_MAX_Q_DEPTH > qc->tag);
+	flags |= qc->tag << CRQB_TAG_SHIFT;
+
+	pp->crqb[pp->req_producer].sg_addr = 
+		cpu_to_le32(pp->sg_tbl_dma & 0xffffffff);
+	pp->crqb[pp->req_producer].sg_addr_hi = 
+		cpu_to_le32((pp->sg_tbl_dma >> 16) >> 16);
+	pp->crqb[pp->req_producer].ctrl_flags = cpu_to_le16(flags);
+
+	cw = &pp->crqb[pp->req_producer].ata_cmd[0];
+	tf = &qc->tf;
+
+	/* Sadly, the CRQB cannot accomodate all registers--there are
+	 * only 11 bytes...so we must pick and choose required
+	 * registers based on the command.  So, we drop feature and
+	 * hob_feature for [RW] DMA commands, but they are needed for
+	 * NCQ.  NCQ will drop hob_nsect.
+	 */
+	switch (tf->command) {
+	case ATA_CMD_READ:
+	case ATA_CMD_READ_EXT:
+	case ATA_CMD_WRITE:
+	case ATA_CMD_WRITE_EXT:
+		mv_crqb_pack_cmd(cw++, tf->hob_nsect, ATA_REG_NSECT, 0);
+		break;
+#ifdef LIBATA_NCQ		/* FIXME: remove this line when NCQ added */
+	case ATA_CMD_FPDMA_READ:
+	case ATA_CMD_FPDMA_WRITE:
+		mv_crqb_pack_cmd(cw++, tf->hob_feature, ATA_REG_FEATURE, 0); 
+		mv_crqb_pack_cmd(cw++, tf->feature, ATA_REG_FEATURE, 0);
+		break;
+#endif				/* FIXME: remove this line when NCQ added */
+	default:
+		/* The only other commands EDMA supports in non-queued and
+		 * non-NCQ mode are: [RW] STREAM DMA and W DMA FUA EXT, none
+		 * of which are defined/used by Linux.  If we get here, this
+		 * driver needs work.
+		 *
+		 * FIXME: modify libata to give qc_prep a return value and
+		 * return error here.
+		 */
+		BUG_ON(tf->command);
+		break;
+	}
+	mv_crqb_pack_cmd(cw++, tf->nsect, ATA_REG_NSECT, 0);
+	mv_crqb_pack_cmd(cw++, tf->hob_lbal, ATA_REG_LBAL, 0);
+	mv_crqb_pack_cmd(cw++, tf->lbal, ATA_REG_LBAL, 0);
+	mv_crqb_pack_cmd(cw++, tf->hob_lbam, ATA_REG_LBAM, 0);
+	mv_crqb_pack_cmd(cw++, tf->lbam, ATA_REG_LBAM, 0);
+	mv_crqb_pack_cmd(cw++, tf->hob_lbah, ATA_REG_LBAH, 0);
+	mv_crqb_pack_cmd(cw++, tf->lbah, ATA_REG_LBAH, 0);
+	mv_crqb_pack_cmd(cw++, tf->device, ATA_REG_DEVICE, 0);
+	mv_crqb_pack_cmd(cw++, tf->command, ATA_REG_CMD, 1);	/* last */
+
+	if (!(qc->flags & ATA_QCFLAG_DMAMAP)) {
+		return;
+	}
+	mv_fill_sg(qc);
+}
+
+/**
+ *      mv_qc_issue - Initiate a command to the host
+ *      @qc: queued command to start
+ *
+ *      This routine simply redirects to the general purpose routine
+ *      if command is not DMA.  Else, it sanity checks our local
+ *      caches of the request producer/consumer indices then enables
+ *      DMA and bumps the request producer index.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static int mv_qc_issue(struct ata_queued_cmd *qc)
+{
+	void __iomem *port_mmio = mv_ap_base(qc->ap);
+	struct mv_port_priv *pp = qc->ap->private_data;
+	u32 in_ptr;
+
+	if (ATA_PROT_DMA != qc->tf.protocol) {
+		/* We're about to send a non-EDMA capable command to the
+		 * port.  Turn off EDMA so there won't be problems accessing
+		 * shadow block, etc registers.
+		 */
+		mv_stop_dma(qc->ap);
+		return ata_qc_issue_prot(qc);
+	}
+
+	in_ptr = readl(port_mmio + EDMA_REQ_Q_IN_PTR_OFS);
+
+	/* the req producer index should be the same as we remember it */
+	assert(((in_ptr >> EDMA_REQ_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK) ==
+	       pp->req_producer);
+	/* until we do queuing, the queue should be empty at this point */
+	assert(((in_ptr >> EDMA_REQ_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK) ==
+	       ((readl(port_mmio + EDMA_REQ_Q_OUT_PTR_OFS) >> 
+		 EDMA_REQ_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK));
+
+	mv_inc_q_index(&pp->req_producer);	/* now incr producer index */
+
+	mv_start_dma(port_mmio, pp);
+
+	/* and write the request in pointer to kick the EDMA to life */
+	in_ptr &= EDMA_REQ_Q_BASE_LO_MASK;
+	in_ptr |= pp->req_producer << EDMA_REQ_Q_PTR_SHIFT;
+	writelfl(in_ptr, port_mmio + EDMA_REQ_Q_IN_PTR_OFS);
+
+	return 0;
+}
+
+/**
+ *      mv_get_crpb_status - get status from most recently completed cmd
+ *      @ap: ATA channel to manipulate
+ *
+ *      This routine is for use when the port is in DMA mode, when it
+ *      will be using the CRPB (command response block) method of
+ *      returning command completion information.  We assert indices
+ *      are good, grab status, and bump the response consumer index to
+ *      prove that we're up to date.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static u8 mv_get_crpb_status(struct ata_port *ap)
+{
+	void __iomem *port_mmio = mv_ap_base(ap);
+	struct mv_port_priv *pp = ap->private_data;
+	u32 out_ptr;
+
+	out_ptr = readl(port_mmio + EDMA_RSP_Q_OUT_PTR_OFS);
+
+	/* the response consumer index should be the same as we remember it */
+	assert(((out_ptr >> EDMA_RSP_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK) == 
+	       pp->rsp_consumer);
+
+	/* increment our consumer index... */
+	pp->rsp_consumer = mv_inc_q_index(&pp->rsp_consumer);
+	
+	/* and, until we do NCQ, there should only be 1 CRPB waiting */
+	assert(((readl(port_mmio + EDMA_RSP_Q_IN_PTR_OFS) >> 
+		 EDMA_RSP_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK) == 
+	       pp->rsp_consumer);
+
+	/* write out our inc'd consumer index so EDMA knows we're caught up */
+	out_ptr &= EDMA_RSP_Q_BASE_LO_MASK;
+	out_ptr |= pp->rsp_consumer << EDMA_RSP_Q_PTR_SHIFT;
+	writelfl(out_ptr, port_mmio + EDMA_RSP_Q_OUT_PTR_OFS);
+
+	/* Return ATA status register for completed CRPB */
+	return (pp->crpb[pp->rsp_consumer].flags >> CRPB_FLAG_STATUS_SHIFT);
+}
+
+/**
+ *      mv_err_intr - Handle error interrupts on the port
+ *      @ap: ATA channel to manipulate
+ *
+ *      In most cases, just clear the interrupt and move on.  However,
+ *      some cases require an eDMA reset, which is done right before
+ *      the COMRESET in mv_phy_reset().  The SERR case requires a
+ *      clear of pending errors in the SATA SERROR register.  Finally,
+ *      if the port disabled DMA, update our cached copy to match.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_err_intr(struct ata_port *ap)
+{
+	void __iomem *port_mmio = mv_ap_base(ap);
+	u32 edma_err_cause, serr = 0;
 
 	edma_err_cause = readl(port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);
 
@@ -468,8 +1026,12 @@ static void mv_err_intr(struct ata_port *ap)
 		serr = scr_read(ap, SCR_ERROR);
 		scr_write_flush(ap, SCR_ERROR, serr);
 	}
-	DPRINTK("port %u error; EDMA err cause: 0x%08x SERR: 0x%08x\n", 
-		ap->port_no, edma_err_cause, serr);
+	if (EDMA_ERR_SELF_DIS & edma_err_cause) {
+		struct mv_port_priv *pp	= ap->private_data;
+		pp->pp_flags &= ~MV_PP_FLAG_EDMA_EN;
+	}
+	DPRINTK(KERN_ERR "ata%u: port error; EDMA err cause: 0x%08x "
+		"SERR: 0x%08x\n", ap->id, edma_err_cause, serr);
 
 	/* Clear EDMA now that SERR cleanup done */
 	writelfl(0, port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);
@@ -480,7 +1042,21 @@ static void mv_err_intr(struct ata_port *ap)
 	}
 }
 
-/* Handle any outstanding interrupts in a single SATAHC 
+/**
+ *      mv_host_intr - Handle all interrupts on the given host controller
+ *      @host_set: host specific structure
+ *      @relevant: port error bits relevant to this host controller
+ *      @hc: which host controller we're to look at
+ *
+ *      Read then write clear the HC interrupt status then walk each
+ *      port connected to the HC and see if it needs servicing.  Port
+ *      success ints are reported in the HC interrupt status reg, the
+ *      port error ints are reported in the higher level main
+ *      interrupt status register and thus are passed in via the
+ *      'relevant' argument.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
  */
 static void mv_host_intr(struct ata_host_set *host_set, u32 relevant,
 			 unsigned int hc)
@@ -490,8 +1066,8 @@ static void mv_host_intr(struct ata_host_set *host_set, u32 relevant,
 	struct ata_port *ap;
 	struct ata_queued_cmd *qc;
 	u32 hc_irq_cause;
-	int shift, port, port0, hard_port;
-	u8 ata_status;
+	int shift, port, port0, hard_port, handled;
+	u8 ata_status = 0;
 
 	if (hc == 0) {
 		port0 = 0;
@@ -502,7 +1078,7 @@ static void mv_host_intr(struct ata_host_set *host_set, u32 relevant,
 	/* we'll need the HC success int register in most cases */
 	hc_irq_cause = readl(hc_mmio + HC_IRQ_CAUSE_OFS);
 	if (hc_irq_cause) {
-		writelfl(0, hc_mmio + HC_IRQ_CAUSE_OFS);
+		writelfl(~hc_irq_cause, hc_mmio + HC_IRQ_CAUSE_OFS);
 	}
 
 	VPRINTK("ENTER, hc%u relevant=0x%08x HC IRQ cause=0x%08x\n",
@@ -511,35 +1087,38 @@ static void mv_host_intr(struct ata_host_set *host_set, u32 relevant,
 	for (port = port0; port < port0 + MV_PORTS_PER_HC; port++) {
 		ap = host_set->ports[port];
 		hard_port = port & MV_PORT_MASK;	/* range 0-3 */
-		ata_status = 0xffU;
+		handled = 0;	/* ensure ata_status is set if handled++ */
 
-		if (((CRBP_DMA_DONE | DEV_IRQ) << hard_port) & hc_irq_cause) {
-			BUG_ON(NULL == ap);
-			/* rcv'd new resp, basic DMA complete, or ATA IRQ */
-			/* This is needed to clear the ATA INTRQ.
-			 * FIXME: don't read the status reg in EDMA mode!
+		if ((CRPB_DMA_DONE << hard_port) & hc_irq_cause) {
+			/* new CRPB on the queue; just one at a time until NCQ
+			 */
+			ata_status = mv_get_crpb_status(ap);
+			handled++;
+		} else if ((DEV_IRQ << hard_port) & hc_irq_cause) {
+			/* received ATA IRQ; read the status reg to clear INTRQ
 			 */
 			ata_status = readb((void __iomem *)
 					   ap->ioaddr.status_addr);
+			handled++;
 		}
 
-		shift = port * 2;
+		shift = port << 1;		/* (port * 2) */
 		if (port >= MV_PORTS_PER_HC) {
 			shift++;	/* skip bit 8 in the HC Main IRQ reg */
 		}
 		if ((PORT0_ERR << shift) & relevant) {
 			mv_err_intr(ap);
-			/* FIXME: smart to OR in ATA_ERR? */
+			/* OR in ATA_ERR to ensure libata knows we took one */
 			ata_status = readb((void __iomem *)
 					   ap->ioaddr.status_addr) | ATA_ERR;
+			handled++;
 		}
 		
-		if (ap) {
+		if (handled && ap) {
 			qc = ata_qc_from_tag(ap, ap->active_tag);
 			if (NULL != qc) {
 				VPRINTK("port %u IRQ found for qc, "
 					"ata_status 0x%x\n", port,ata_status);
-				BUG_ON(0xffU == ata_status);
 				/* mark qc status appropriately */
 				ata_qc_complete(qc, ata_status);
 			}
@@ -548,17 +1127,30 @@ static void mv_host_intr(struct ata_host_set *host_set, u32 relevant,
 	VPRINTK("EXIT\n");
 }
 
+/**
+ *      mv_interrupt - 
+ *      @irq: unused
+ *      @dev_instance: private data; in this case the host structure
+ *      @regs: unused
+ *
+ *      Read the read only register to determine if any host
+ *      controllers have pending interrupts.  If so, call lower level
+ *      routine to handle.  Also check for PCI errors which are only
+ *      reported here.
+ *
+ *      LOCKING: 
+ *      This routine holds the host_set lock while processing pending
+ *      interrupts.
+ */
 static irqreturn_t mv_interrupt(int irq, void *dev_instance,
 				struct pt_regs *regs)
 {
 	struct ata_host_set *host_set = dev_instance;
 	unsigned int hc, handled = 0, n_hcs;
-	void __iomem *mmio;
+	void __iomem *mmio = host_set->mmio_base;
 	u32 irq_stat;
 
-	mmio = host_set->mmio_base;
 	irq_stat = readl(mmio + HC_MAIN_IRQ_CAUSE_OFS);
-	n_hcs = mv_get_hc_count(host_set->ports[0]->flags);
 
 	/* check the cases where we either have nothing pending or have read
 	 * a bogus register value which can indicate HW removal or PCI fault
@@ -567,64 +1159,105 @@ static irqreturn_t mv_interrupt(int irq, void *dev_instance,
 		return IRQ_NONE;
 	}
 
+	n_hcs = mv_get_hc_count(host_set->ports[0]->flags);
 	spin_lock(&host_set->lock);
 
 	for (hc = 0; hc < n_hcs; hc++) {
 		u32 relevant = irq_stat & (HC0_IRQ_PEND << (hc * HC_SHIFT));
 		if (relevant) {
 			mv_host_intr(host_set, relevant, hc);
-			handled = 1;
+			handled++;
 		}
 	}
 	if (PCI_ERR & irq_stat) {
-		/* FIXME: these are all masked by default, but still need
-		 * to recover from them properly.
-		 */
-	}
+		printk(KERN_ERR DRV_NAME ": PCI ERROR; PCI IRQ cause=0x%08x\n",
+		       readl(mmio + PCI_IRQ_CAUSE_OFS));
 
+		DPRINTK("All regs @ PCI error\n");
+		mv_dump_all_regs(mmio, -1, to_pci_dev(host_set->dev));
+
+		writelfl(0, mmio + PCI_IRQ_CAUSE_OFS);
+		handled++;
+	}
 	spin_unlock(&host_set->lock);
 
 	return IRQ_RETVAL(handled);
 }
 
+/**
+ *      mv_check_err - Return the error shadow register to caller.
+ *      @ap: ATA channel to manipulate
+ *
+ *      Marvell requires DMA to be stopped before accessing shadow
+ *      registers.  So we do that, then return the needed register.
+ *
+ *      LOCKING:
+ *      Inherited from caller.  FIXME: protect mv_stop_dma with lock?
+ */
+static u8 mv_check_err(struct ata_port *ap)
+{
+	mv_stop_dma(ap);		/* can't read shadow regs if DMA on */
+	return readb((void __iomem *) ap->ioaddr.error_addr);
+}
+
+/**
+ *      mv_phy_reset - Perform eDMA reset followed by COMRESET
+ *      @ap: ATA channel to manipulate
+ *
+ *      Part of this is taken from __sata_phy_reset and modified to
+ *      not sleep since this routine gets called from interrupt level.
+ *
+ *      LOCKING:
+ *      Inherited from caller.  This is coded to safe to call at
+ *      interrupt level, i.e. it does not sleep.
+ */
 static void mv_phy_reset(struct ata_port *ap)
 {
 	void __iomem *port_mmio = mv_ap_base(ap);
 	struct ata_taskfile tf;
 	struct ata_device *dev = &ap->device[0];
-	u32 edma = 0, bdma;
+	unsigned long timeout;
 
 	VPRINTK("ENTER, port %u, mmio 0x%p\n", ap->port_no, port_mmio);
 
-	edma = readl(port_mmio + EDMA_CMD_OFS);
-	if (EDMA_EN & edma) {
-		/* disable EDMA if active */
-		edma &= ~EDMA_EN;
-		writelfl(edma | EDMA_DS, port_mmio + EDMA_CMD_OFS);
-		udelay(1);
-	} else if (mv_port_bdma_capable(ap) &&
-		   (bdma = readl(port_mmio + BDMA_CMD_OFS)) & BDMA_START) {
-		/* disable BDMA if active */
-		writelfl(bdma & ~BDMA_START, port_mmio + BDMA_CMD_OFS);
-	}
+	mv_stop_dma(ap);
 
-	writelfl(edma | ATA_RST, port_mmio + EDMA_CMD_OFS);
+	writelfl(ATA_RST, port_mmio + EDMA_CMD_OFS);
 	udelay(25);		/* allow reset propagation */
 
 	/* Spec never mentions clearing the bit.  Marvell's driver does
 	 * clear the bit, however.
 	 */
-	writelfl(edma & ~ATA_RST, port_mmio + EDMA_CMD_OFS);
+	writelfl(0, port_mmio + EDMA_CMD_OFS);
 
-	VPRINTK("Done.  Now calling __sata_phy_reset()\n");
+	VPRINTK("S-regs after ATA_RST: SStat 0x%08x SErr 0x%08x "
+		"SCtrl 0x%08x\n", mv_scr_read(ap, SCR_STATUS),
+		mv_scr_read(ap, SCR_ERROR), mv_scr_read(ap, SCR_CONTROL));
 
 	/* proceed to init communications via the scr_control reg */
-	__sata_phy_reset(ap);
+	scr_write_flush(ap, SCR_CONTROL, 0x301);
+	mdelay(1);
+	scr_write_flush(ap, SCR_CONTROL, 0x300);
+	timeout = jiffies + (HZ * 1);
+	do {
+		mdelay(10);
+		if ((scr_read(ap, SCR_STATUS) & 0xf) != 1)
+			break;
+	} while (time_before(jiffies, timeout));
 
-	if (ap->flags & ATA_FLAG_PORT_DISABLED) {
-		VPRINTK("Port disabled pre-sig.  Exiting.\n");
+	VPRINTK("S-regs after PHY wake: SStat 0x%08x SErr 0x%08x "
+		"SCtrl 0x%08x\n", mv_scr_read(ap, SCR_STATUS),
+		mv_scr_read(ap, SCR_ERROR), mv_scr_read(ap, SCR_CONTROL));
+
+	if (sata_dev_present(ap)) {
+		ata_port_probe(ap);
+	} else {
+		printk(KERN_INFO "ata%u: no device found (phy stat %08x)\n",
+		       ap->id, scr_read(ap, SCR_STATUS));
+		ata_port_disable(ap);
 		return;
 	}
+	ap->cbl = ATA_CBL_SATA;
 
 	tf.lbah = readb((void __iomem *) ap->ioaddr.lbah_addr);
 	tf.lbam = readb((void __iomem *) ap->ioaddr.lbam_addr);
@@ -639,37 +1272,118 @@ static void mv_phy_reset(struct ata_port *ap)
 	VPRINTK("EXIT\n");
 }
 
-static void mv_port_init(struct ata_ioports *port, unsigned long base)
+/**
+ *      mv_eng_timeout - Routine called by libata when SCSI times out I/O
+ *      @ap: ATA channel to manipulate
+ *
+ *      Intent is to clear all pending error conditions, reset the
+ *      chip/bus, fail the command, and move on.
+ *
+ *      LOCKING:
+ *      This routine holds the host_set lock while failing the command.
+ */
+static void mv_eng_timeout(struct ata_port *ap)
+{
+	struct ata_queued_cmd *qc;
+	unsigned long flags;
+
+	printk(KERN_ERR "ata%u: Entering mv_eng_timeout\n",ap->id);
+	DPRINTK("All regs @ start of eng_timeout\n");
+	mv_dump_all_regs(ap->host_set->mmio_base, ap->port_no, 
+			 to_pci_dev(ap->host_set->dev));
+
+	qc = ata_qc_from_tag(ap, ap->active_tag);
+        printk(KERN_ERR "mmio_base %p ap %p qc %p scsi_cmnd %p &cmnd %p\n",
+	       ap->host_set->mmio_base, ap, qc, qc->scsicmd, 
+	       &qc->scsicmd->cmnd);
+
+	mv_err_intr(ap);
+	mv_phy_reset(ap);
+
+	if (!qc) {
+		printk(KERN_ERR "ata%u: BUG: timeout without command\n",
+		       ap->id);
+	} else {
+		/* hack alert!  We cannot use the supplied completion
+	 	 * function from inside the ->eh_strategy_handler() thread.
+	 	 * libata is the only user of ->eh_strategy_handler() in
+	 	 * any kernel, so the default scsi_done() assumes it is
+	 	 * not being called from the SCSI EH.
+	 	 */
+		spin_lock_irqsave(&ap->host_set->lock, flags);
+		qc->scsidone = scsi_finish_command;
+		ata_qc_complete(qc, ATA_ERR);
+		spin_unlock_irqrestore(&ap->host_set->lock, flags);
+	}
+}
+
+/**
+ *      mv_port_init - Perform some early initialization on a single port.
+ *      @port: libata data structure storing shadow register addresses
+ *      @port_mmio: base address of the port
+ *
+ *      Initialize shadow register mmio addresses, clear outstanding
+ *      interrupts on the port, and unmask interrupts for the future
+ *      start of the port.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_port_init(struct ata_ioports *port,  void __iomem *port_mmio)
 {
-	/* PIO related setup */
-	port->data_addr = base + SHD_PIO_DATA_OFS;
-	port->error_addr = port->feature_addr = base + SHD_FEA_ERR_OFS;
-	port->nsect_addr = base + SHD_SECT_CNT_OFS;
-	port->lbal_addr = base + SHD_LBA_L_OFS;
-	port->lbam_addr = base + SHD_LBA_M_OFS;
-	port->lbah_addr = base + SHD_LBA_H_OFS;
-	port->device_addr = base + SHD_DEV_HD_OFS;
-	port->status_addr = port->command_addr = base + SHD_CMD_STA_OFS;
-	port->altstatus_addr = port->ctl_addr = base + SHD_CTL_AST_OFS;
-	/* unused */
+	unsigned long shd_base = (unsigned long) port_mmio + SHD_BLK_OFS;
+	unsigned serr_ofs;
+
+	/* PIO related setup 
+	 */
+	port->data_addr = shd_base + (sizeof(u32) * ATA_REG_DATA);
+	port->error_addr = 
+		port->feature_addr = shd_base + (sizeof(u32) * ATA_REG_ERR);
+	port->nsect_addr = shd_base + (sizeof(u32) * ATA_REG_NSECT);
+	port->lbal_addr = shd_base + (sizeof(u32) * ATA_REG_LBAL);
+	port->lbam_addr = shd_base + (sizeof(u32) * ATA_REG_LBAM);
+	port->lbah_addr = shd_base + (sizeof(u32) * ATA_REG_LBAH);
+	port->device_addr = shd_base + (sizeof(u32) * ATA_REG_DEVICE);
+	port->status_addr = 
+		port->command_addr = shd_base + (sizeof(u32) * ATA_REG_STATUS);
+	/* special case: control/altstatus doesn't have ATA_REG_ address */
+	port->altstatus_addr = port->ctl_addr = shd_base + SHD_CTL_AST_OFS;
+
+	/* unused: */
 	port->cmd_addr = port->bmdma_addr = port->scr_addr = 0;
 
+	/* Clear any currently outstanding port interrupt conditions */
+	serr_ofs = mv_scr_offset(SCR_ERROR);
+	writelfl(readl(port_mmio + serr_ofs), port_mmio + serr_ofs);
+	writelfl(0, port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);
+
 	/* unmask all EDMA error interrupts */
-	writel(~0, (void __iomem *)base + EDMA_ERR_IRQ_MASK_OFS);
+	writelfl(~0, port_mmio + EDMA_ERR_IRQ_MASK_OFS);
 
 	VPRINTK("EDMA cfg=0x%08x EDMA IRQ err cause/mask=0x%08x/0x%08x\n", 
-		readl((void __iomem *)base + EDMA_CFG_OFS),
-		readl((void __iomem *)base + EDMA_ERR_IRQ_CAUSE_OFS),
-		readl((void __iomem *)base + EDMA_ERR_IRQ_MASK_OFS));
+		readl(port_mmio + EDMA_CFG_OFS),
+		readl(port_mmio + EDMA_ERR_IRQ_CAUSE_OFS),
+		readl(port_mmio + EDMA_ERR_IRQ_MASK_OFS));
 }
 
+/**
+ *      mv_host_init - Perform some early initialization of the host.
+ *      @probe_ent: early data struct representing the host
+ *
+ *      If possible, do an early global reset of the host.  Then do
+ *      our port init and clear/unmask all/relevant host interrupts.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
 static int mv_host_init(struct ata_probe_ent *probe_ent)
 {
 	int rc = 0, n_hc, port, hc;
 	void __iomem *mmio = probe_ent->mmio_base;
 	void __iomem *port_mmio;
 
-	if (mv_master_reset(probe_ent->mmio_base)) {
+	if ((MV_FLAG_GLBL_SFT_RST & probe_ent->host_flags) && 
+	    mv_global_soft_reset(probe_ent->mmio_base)) {
 		rc = 1;
 		goto done;
 	}
@@ -679,17 +1393,27 @@ static int mv_host_init(struct ata_probe_ent *probe_ent)
 
 	for (port = 0; port < probe_ent->n_ports; port++) {
 		port_mmio = mv_port_base(mmio, port);
-		mv_port_init(&probe_ent->port[port], (unsigned long)port_mmio);
+		mv_port_init(&probe_ent->port[port], port_mmio);
 	}
 
 	for (hc = 0; hc < n_hc; hc++) {
-		VPRINTK("HC%i: HC config=0x%08x HC IRQ cause=0x%08x\n", hc,
-			readl(mv_hc_base(mmio, hc) + HC_CFG_OFS),
-			readl(mv_hc_base(mmio, hc) + HC_IRQ_CAUSE_OFS));
+		void __iomem *hc_mmio = mv_hc_base(mmio, hc);
+
+		VPRINTK("HC%i: HC config=0x%08x HC IRQ cause "
+			"(before clear)=0x%08x\n", hc,
+			readl(hc_mmio + HC_CFG_OFS),
+			readl(hc_mmio + HC_IRQ_CAUSE_OFS));
+
+		/* Clear any currently outstanding hc interrupt conditions */
+		writelfl(0, hc_mmio + HC_IRQ_CAUSE_OFS);
 	}
 
-	writel(~HC_MAIN_MASKED_IRQS, mmio + HC_MAIN_IRQ_MASK_OFS);
-	writel(PCI_UNMASK_ALL_IRQS, mmio + PCI_IRQ_MASK_OFS);
+	/* Clear any currently outstanding host interrupt conditions */
+	writelfl(0, mmio + PCI_IRQ_CAUSE_OFS);
+
+	/* and unmask interrupt generation for host regs */
+	writelfl(PCI_UNMASK_ALL_IRQS, mmio + PCI_IRQ_MASK_OFS);
+	writelfl(~HC_MAIN_MASKED_IRQS, mmio + HC_MAIN_IRQ_MASK_OFS);
 
 	VPRINTK("HC MAIN IRQ cause/mask=0x%08x/0x%08x "
 		"PCI int cause/mask=0x%08x/0x%08x\n", 
@@ -697,11 +1421,53 @@ static int mv_host_init(struct ata_probe_ent *probe_ent)
 		readl(mmio + HC_MAIN_IRQ_MASK_OFS),
 		readl(mmio + PCI_IRQ_CAUSE_OFS),
 		readl(mmio + PCI_IRQ_MASK_OFS));
-
- done:
+done:
 	return rc;
 }
 
+/**
+ *      mv_print_info - Dump key info to kernel log for perusal.
+ *      @probe_ent: early data struct representing the host
+ *
+ *      FIXME: complete this.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_print_info(struct ata_probe_ent *probe_ent)
+{
+	struct pci_dev *pdev = to_pci_dev(probe_ent->dev);
+	struct mv_host_priv *hpriv = probe_ent->private_data;
+	u8 rev_id, scc;
+	const char *scc_s;
+
+	/* Use this to determine the HW stepping of the chip so we know
+	 * what errata to workaround
+	 */
+	pci_read_config_byte(pdev, PCI_REVISION_ID, &rev_id);
+
+	pci_read_config_byte(pdev, PCI_CLASS_DEVICE, &scc);
+	if (scc == 0)
+		scc_s = "SCSI";
+	else if (scc == 0x01)
+		scc_s = "RAID";
+	else
+		scc_s = "unknown";
+
+	printk(KERN_INFO DRV_NAME 
+	       "(%s) %u slots %u ports %s mode IRQ via %s\n",
+	       pci_name(pdev), (unsigned)MV_MAX_Q_DEPTH, probe_ent->n_ports, 
+	       scc_s, (MV_HP_FLAG_MSI & hpriv->hp_flags) ? "MSI" : "INTx");
+}
+
+/**
+ *      mv_init_one - handle a positive probe of a Marvell host
+ *      @pdev: PCI device found
+ *      @ent: PCI device ID entry for the matched host
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
 static int mv_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	static int printed_version = 0;
@@ -709,16 +1475,12 @@ static int mv_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	struct mv_host_priv *hpriv;
 	unsigned int board_idx = (unsigned int)ent->driver_data;
 	void __iomem *mmio_base;
-	int pci_dev_busy = 0;
-	int rc;
+	int pci_dev_busy = 0, rc;
 
 	if (!printed_version++) {
-		printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
+		printk(KERN_INFO DRV_NAME " version " DRV_VERSION "\n");
 	}
 
-	VPRINTK("ENTER for PCI Bus:Slot.Func=%u:%u.%u\n", pdev->bus->number,
-		PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
-
 	rc = pci_enable_device(pdev);
 	if (rc) {
 		return rc;
@@ -730,8 +1492,6 @@ static int mv_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 		goto err_out;
 	}
 
-	pci_intx(pdev, 1);
-
 	probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
 	if (probe_ent == NULL) {
 		rc = -ENOMEM;
@@ -742,8 +1502,7 @@ static int mv_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	probe_ent->dev = pci_dev_to_dev(pdev);
 	INIT_LIST_HEAD(&probe_ent->node);
 
-	mmio_base = ioremap_nocache(pci_resource_start(pdev, MV_PRIMARY_BAR),
-				    pci_resource_len(pdev, MV_PRIMARY_BAR));
+	mmio_base = pci_iomap(pdev, MV_PRIMARY_BAR, 0);
 	if (mmio_base == NULL) {
 		rc = -ENOMEM;
 		goto err_out_free_ent;
@@ -772,37 +1531,40 @@ static int mv_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (rc) {
 		goto err_out_hpriv;
 	}
-/* 	mv_print_info(probe_ent); */
 
-	{
-		int b, w;
-		u32 dw[4];	/* hold a line of 16b */
-		VPRINTK("PCI config space:\n");
-		for (b = 0; b < 0x40; ) {
-			for (w = 0; w < 4; w++) {
-				(void) pci_read_config_dword(pdev,b,&dw[w]);
-				b += sizeof(*dw);
-			}
-			VPRINTK("%08x %08x %08x %08x\n",
-				dw[0],dw[1],dw[2],dw[3]);
-		}
+	/* Enable interrupts */
+	if (pci_enable_msi(pdev) == 0) {
+		hpriv->hp_flags |= MV_HP_FLAG_MSI;
+	} else {
+		pci_intx(pdev, 1);
 	}
 
-	/* FIXME: check ata_device_add return value */
-	ata_device_add(probe_ent);
-	kfree(probe_ent);
+	mv_dump_pci_cfg(pdev, 0x68);
+	mv_print_info(probe_ent);
+
+	if (ata_device_add(probe_ent) == 0) {
+		rc = -ENODEV;		/* No devices discovered */
+		goto err_out_dev_add;
+	}
 
+	kfree(probe_ent);
 	return 0;
 
- err_out_hpriv:
+err_out_dev_add:
+	if (MV_HP_FLAG_MSI & hpriv->hp_flags) {
+		pci_disable_msi(pdev);
+	} else {
+		pci_intx(pdev, 0);
+	}
+err_out_hpriv:
 	kfree(hpriv);
- err_out_iounmap:
-	iounmap(mmio_base);
- err_out_free_ent:
+err_out_iounmap:
+	pci_iounmap(pdev, mmio_base);
+err_out_free_ent:
 	kfree(probe_ent);
- err_out_regions:
+err_out_regions:
 	pci_release_regions(pdev);
- err_out:
+err_out:
 	if (!pci_dev_busy) {
 		pci_disable_device(pdev);
 	}