sata_mv.c

/*
 * sata_mv.c - Marvell SATA support
 *
 * Copyright 2005: EMC Corporation, all rights reserved. 
 *
 * Please ALWAYS copy linux-ide@vger.kernel.org on emails.
 *
 * 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; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/dma-mapping.h>
#include "scsi.h"
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <asm/io.h>

#define DRV_NAME	"sata_mv"
#define DRV_VERSION	"0.12"

enum {
	/* BAR's are enumerated in terms of pci_resource_start() terms */
	MV_PRIMARY_BAR		= 0,	/* offset 0x10: memory space */
	MV_IO_BAR		= 2,	/* offset 0x18: IO space */
	MV_MISC_BAR		= 3,	/* offset 0x1c: FLASH, NVRAM, SRAM */

	MV_MAJOR_REG_AREA_SZ	= 0x10000,	/* 64KB */
	MV_MINOR_REG_AREA_SZ	= 0x2000,	/* 8KB */

	MV_PCI_REG_BASE		= 0,
	MV_IRQ_COAL_REG_BASE	= 0x18000,	/* 6xxx part only */
	MV_SATAHC0_REG_BASE	= 0x20000,

	MV_PCI_REG_SZ		= MV_MAJOR_REG_AREA_SZ,
	MV_SATAHC_REG_SZ	= MV_MAJOR_REG_AREA_SZ,
	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_DMA_BOUNDARY		= 0xffffffffU,
	SATAHC_MASK		= (~(MV_SATAHC_REG_SZ - 1)),

	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 */
	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 */

	chip_504x		= 0,
	chip_508x		= 1,
	chip_604x		= 2,
	chip_608x		= 3,

	/* PCI interface registers */

	PCI_MAIN_CMD_STS_OFS	= 0xd30,
	STOP_PCI_MASTER		= (1 << 2),
	PCI_MASTER_EMPTY	= (1 << 3),
	GLOB_SFT_RST		= (1 << 4),

	PCI_IRQ_CAUSE_OFS	= 0x1d58,
	PCI_IRQ_MASK_OFS	= 0x1d5c,
	PCI_UNMASK_ALL_IRQS	= 0x7fffff,	/* bits 22-0 */

	HC_MAIN_IRQ_CAUSE_OFS	= 0x1d60,
	HC_MAIN_IRQ_MASK_OFS	= 0x1d64,
	PORT0_ERR		= (1 << 0),	/* shift by port # */
	PORT0_DONE		= (1 << 1),	/* shift by port # */
	HC0_IRQ_PEND		= 0x1ff,	/* bits 0-8 = HC0's ports */
	HC_SHIFT		= 9,		/* bits 9-17 = HC1's ports */
	PCI_ERR			= (1 << 18),
	TRAN_LO_DONE		= (1 << 19),	/* 6xxx: IRQ coalescing */
	TRAN_HI_DONE		= (1 << 20),	/* 6xxx: IRQ coalescing */
	PORTS_0_7_COAL_DONE	= (1 << 21),	/* 6xxx: IRQ coalescing */
	GPIO_INT		= (1 << 22),
	SELF_INT		= (1 << 23),
	TWSI_INT		= (1 << 24),
	HC_MAIN_RSVD		= (0x7f << 25),	/* bits 31-25 */
	HC_MAIN_MASKED_IRQS	= (TRAN_LO_DONE | TRAN_HI_DONE | 
				   PORTS_0_7_COAL_DONE | GPIO_INT | TWSI_INT |
				   HC_MAIN_RSVD),

	/* SATAHC registers */
	HC_CFG_OFS		= 0,

	HC_IRQ_CAUSE_OFS	= 0x14,
	CRBP_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,

	/* SATA registers */
	SATA_STATUS_OFS		= 0x300,  /* ctrl, err regs follow status */
	SATA_ACTIVE_OFS		= 0x350,

	/* Port registers */
	EDMA_CFG_OFS		= 0,

	EDMA_ERR_IRQ_CAUSE_OFS	= 0x8,
	EDMA_ERR_IRQ_MASK_OFS	= 0xc,
	EDMA_ERR_D_PAR		= (1 << 0),
	EDMA_ERR_PRD_PAR	= (1 << 1),
	EDMA_ERR_DEV		= (1 << 2),
	EDMA_ERR_DEV_DCON	= (1 << 3),
	EDMA_ERR_DEV_CON	= (1 << 4),
	EDMA_ERR_SERR		= (1 << 5),
	EDMA_ERR_SELF_DIS	= (1 << 7),
	EDMA_ERR_BIST_ASYNC	= (1 << 8),
	EDMA_ERR_CRBQ_PAR	= (1 << 9),
	EDMA_ERR_CRPB_PAR	= (1 << 10),
	EDMA_ERR_INTRL_PAR	= (1 << 11),
	EDMA_ERR_IORDY		= (1 << 12),
	EDMA_ERR_LNK_CTRL_RX	= (0xf << 13),
	EDMA_ERR_LNK_CTRL_RX_2	= (1 << 15),
	EDMA_ERR_LNK_DATA_RX	= (0xf << 17),
	EDMA_ERR_LNK_CTRL_TX	= (0x1f << 21),
	EDMA_ERR_LNK_DATA_TX	= (0x1f << 26),
	EDMA_ERR_TRANS_PROTO	= (1 << 31),
	EDMA_ERR_FATAL		= (EDMA_ERR_D_PAR | EDMA_ERR_PRD_PAR | 
				   EDMA_ERR_DEV_DCON | EDMA_ERR_CRBQ_PAR |
				   EDMA_ERR_CRPB_PAR | EDMA_ERR_INTRL_PAR |
				   EDMA_ERR_IORDY | EDMA_ERR_LNK_CTRL_RX_2 | 
				   EDMA_ERR_LNK_DATA_RX |
				   EDMA_ERR_LNK_DATA_TX | 
				   EDMA_ERR_TRANS_PROTO),

	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),

	MV_UNDEF		= 0,
};

struct mv_port_priv {

};

struct mv_host_priv {

};

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 void mv_phy_reset(struct ata_port *ap);
static int mv_master_reset(void __iomem *mmio_base);
static irqreturn_t mv_interrupt(int irq, void *dev_instance,
				struct pt_regs *regs);
static int mv_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);

static Scsi_Host_Template mv_sht = {
	.module			= THIS_MODULE,
	.name			= DRV_NAME,
	.ioctl			= ata_scsi_ioctl,
	.queuecommand		= ata_scsi_queuecmd,
	.eh_strategy_handler	= ata_scsi_error,
	.can_queue		= ATA_DEF_QUEUE,
	.this_id		= ATA_SHT_THIS_ID,
	.sg_tablesize		= MV_UNDEF,
	.max_sectors		= ATA_MAX_SECTORS,
	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
	.emulated		= ATA_SHT_EMULATED,
	.use_clustering		= MV_UNDEF,
	.proc_name		= DRV_NAME,
	.dma_boundary		= MV_DMA_BOUNDARY,
	.slave_configure	= ata_scsi_slave_config,
	.bios_param		= ata_std_bios_param,
	.ordered_flush		= 1,
};

static struct ata_port_operations mv_ops = {
	.port_disable		= ata_port_disable,

	.tf_load		= ata_tf_load,
	.tf_read		= ata_tf_read,
	.check_status		= ata_check_status,
	.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,

	.eng_timeout		= ata_eng_timeout,

	.irq_handler		= mv_interrupt,
	.irq_clear		= mv_irq_clear,

	.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,
};

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),
		.pio_mask	= 0x1f,	/* pio4-0 */
		.udma_mask	= 0,	/* 0x7f (udma6-0 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 | 
				   MV_FLAG_DUAL_HC),
		.pio_mask	= 0x1f,	/* pio4-0 */
		.udma_mask	= 0,	/* 0x7f (udma6-0 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 | 
				   MV_FLAG_IRQ_COALESCE | MV_FLAG_BDMA),
		.pio_mask	= 0x1f,	/* pio4-0 */
		.udma_mask	= 0,	/* 0x7f (udma6-0 disabled for now) */
		.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 |
				   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) */
		.port_ops	= &mv_ops,
	},
};

static struct pci_device_id mv_pci_tbl[] = {
	{PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x5040), 0, 0, chip_504x},
	{PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x5041), 0, 0, chip_504x},
	{PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x5080), 0, 0, chip_508x},
	{PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x5081), 0, 0, chip_508x},

	{PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x6040), 0, 0, chip_604x},
	{PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x6041), 0, 0, chip_604x},
	{PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x6080), 0, 0, chip_608x},
	{PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x6081), 0, 0, chip_608x},
	{}			/* terminate list */
};

static struct pci_driver mv_pci_driver = {
	.name			= DRV_NAME,
	.id_table		= mv_pci_tbl,
	.probe			= mv_init_one,
	.remove			= ata_pci_remove_one,
};

/*
 * Functions
 */

static inline void writelfl(unsigned long data, void __iomem *addr)
{
	writel(data, 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));
}

static inline void __iomem *mv_port_base(void __iomem *base, unsigned int port)
{
	return (mv_hc_base(base, port >> MV_PORT_HC_SHIFT) +
		MV_SATAHC_ARBTR_REG_SZ + 
		((port & MV_PORT_MASK) * MV_PORT_REG_SZ));
}

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)
{
	return ((flags & MV_FLAG_DUAL_HC) ? 2 : 1);
}

static inline int mv_is_edma_active(struct ata_port *ap)
{
	void __iomem *port_mmio = mv_ap_base(ap);
	return (EDMA_EN & readl(port_mmio + EDMA_CMD_OFS));
}

static inline int mv_port_bdma_capable(struct ata_port *ap)
{
	return (ap->flags & MV_FLAG_BDMA);
}

static void mv_irq_clear(struct ata_port *ap)
{
}

static unsigned int mv_scr_offset(unsigned int sc_reg_in)
{
	unsigned int ofs;

	switch (sc_reg_in) {
	case SCR_STATUS:
	case SCR_CONTROL:
	case SCR_ERROR:
		ofs = SATA_STATUS_OFS + (sc_reg_in * sizeof(u32));
		break;
	case SCR_ACTIVE:
		ofs = SATA_ACTIVE_OFS;   /* active is not with the others */
		break;
	default:
		ofs = 0xffffffffU;
		break;
	}
	return ofs;
}

static u32 mv_scr_read(struct ata_port *ap, unsigned int sc_reg_in)
{
	unsigned int ofs = mv_scr_offset(sc_reg_in);

	if (0xffffffffU != ofs) {
		return readl(mv_ap_base(ap) + ofs);
	} else {
		return (u32) ofs;
	}
}

static void mv_scr_write(struct ata_port *ap, unsigned int sc_reg_in, u32 val)
{
	unsigned int ofs = mv_scr_offset(sc_reg_in);

	if (0xffffffffU != ofs) {
		writelfl(val, mv_ap_base(ap) + ofs);
	}
}

static int mv_master_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);
		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? */
		goto done;
	}

	/* set reset */
	i = 5;
	do {
		writel(t | GLOB_SFT_RST, 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 set global reset\n");
		rc = 1;		/* broken HW? */
		goto done;
	}

	/* clear reset */
	i = 5;
	do {
		writel(t & ~GLOB_SFT_RST, 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? */
	}

 done:
	VPRINTK("EXIT, rc = %i\n", rc);
	return rc;
}

static void mv_err_intr(struct ata_port *ap)
{
	void __iomem *port_mmio;
	u32 edma_err_cause, serr = 0;

	/* 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
	 */
	BUG_ON(NULL == ap);
	port_mmio = mv_ap_base(ap);

	edma_err_cause = readl(port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);

	if (EDMA_ERR_SERR & edma_err_cause) {
		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);

	/* Clear EDMA now that SERR cleanup done */
	writelfl(0, port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);

	/* check for fatal here and recover if needed */
	if (EDMA_ERR_FATAL & edma_err_cause) {
		mv_phy_reset(ap);
	}
}

/* Handle any outstanding interrupts in a single SATAHC 
 */
static void mv_host_intr(struct ata_host_set *host_set, u32 relevant,
			 unsigned int hc)
{
	void __iomem *mmio = host_set->mmio_base;
	void __iomem *hc_mmio = mv_hc_base(mmio, hc);
	struct ata_port *ap;
	struct ata_queued_cmd *qc;
	u32 hc_irq_cause;
	int shift, port, port0, hard_port;
	u8 ata_status;

	if (hc == 0) {
		port0 = 0;
	} else {
		port0 = MV_PORTS_PER_HC;
	}

	/* 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);
	}

	VPRINTK("ENTER, hc%u relevant=0x%08x HC IRQ cause=0x%08x\n",
		hc,relevant,hc_irq_cause);

	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;

		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!
			 */
			ata_status = readb((void __iomem *)
					   ap->ioaddr.status_addr);
		}

		shift = 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? */
			ata_status = readb((void __iomem *)
					   ap->ioaddr.status_addr) | ATA_ERR;
		}
		
		if (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);
			}
		}
	}
	VPRINTK("EXIT\n");
}

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;
	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
	 */
	if (!irq_stat || (0xffffffffU == irq_stat)) {
		return IRQ_NONE;
	}

	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;
		}
	}
	if (PCI_ERR & irq_stat) {
		/* FIXME: these are all masked by default, but still need
		 * to recover from them properly.
		 */
	}

	spin_unlock(&host_set->lock);

	return IRQ_RETVAL(handled);
}

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;

	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);
	}

	writelfl(edma | 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);

	VPRINTK("Done.  Now calling __sata_phy_reset()\n");

	/* proceed to init communications via the scr_control reg */
	__sata_phy_reset(ap);

	if (ap->flags & ATA_FLAG_PORT_DISABLED) {
		VPRINTK("Port disabled pre-sig.  Exiting.\n");
		return;
	}

	tf.lbah = readb((void __iomem *) ap->ioaddr.lbah_addr);
	tf.lbam = readb((void __iomem *) ap->ioaddr.lbam_addr);
	tf.lbal = readb((void __iomem *) ap->ioaddr.lbal_addr);
	tf.nsect = readb((void __iomem *) ap->ioaddr.nsect_addr);

	dev->class = ata_dev_classify(&tf);
	if (!ata_dev_present(dev)) {
		VPRINTK("Port disabled post-sig: No device present.\n");
		ata_port_disable(ap);
	}
	VPRINTK("EXIT\n");
}

static void mv_port_init(struct ata_ioports *port, unsigned long base)
{
	/* 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 */
	port->cmd_addr = port->bmdma_addr = port->scr_addr = 0;

	/* unmask all EDMA error interrupts */
	writel(~0, (void __iomem *)base + 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));
}

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)) {
		rc = 1;
		goto done;
	}

	n_hc = mv_get_hc_count(probe_ent->host_flags);
	probe_ent->n_ports = MV_PORTS_PER_HC * n_hc;

	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);
	}

	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));
	}

	writel(~HC_MAIN_MASKED_IRQS, mmio + HC_MAIN_IRQ_MASK_OFS);
	writel(PCI_UNMASK_ALL_IRQS, mmio + PCI_IRQ_MASK_OFS);

	VPRINTK("HC MAIN IRQ cause/mask=0x%08x/0x%08x "
		"PCI int cause/mask=0x%08x/0x%08x\n", 
		readl(mmio + HC_MAIN_IRQ_CAUSE_OFS),
		readl(mmio + HC_MAIN_IRQ_MASK_OFS),
		readl(mmio + PCI_IRQ_CAUSE_OFS),
		readl(mmio + PCI_IRQ_MASK_OFS));

 done:
	return rc;
}

/* move to PCI layer, integrate w/ MSI stuff */
static void pci_intx(struct pci_dev *pdev, int enable)
{
	u16 pci_command, new;

	pci_read_config_word(pdev, PCI_COMMAND, &pci_command);

	if (enable)
		new = pci_command & ~PCI_COMMAND_INTX_DISABLE;
	else
		new = pci_command | PCI_COMMAND_INTX_DISABLE;

	if (new != pci_command)
		pci_write_config_word(pdev, PCI_COMMAND, pci_command);
}

static int mv_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	static int printed_version = 0;
	struct ata_probe_ent *probe_ent = NULL;
	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;

	if (!printed_version++) {
		printk(KERN_DEBUG 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;
	}

	rc = pci_request_regions(pdev, DRV_NAME);
	if (rc) {
		pci_dev_busy = 1;
		goto err_out;
	}

	pci_intx(pdev, 1);

	probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
	if (probe_ent == NULL) {
		rc = -ENOMEM;
		goto err_out_regions;
	}

	memset(probe_ent, 0, sizeof(*probe_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));
	if (mmio_base == NULL) {
		rc = -ENOMEM;
		goto err_out_free_ent;
	}

	hpriv = kmalloc(sizeof(*hpriv), GFP_KERNEL);
	if (!hpriv) {
		rc = -ENOMEM;
		goto err_out_iounmap;
	}
	memset(hpriv, 0, sizeof(*hpriv));

	probe_ent->sht = mv_port_info[board_idx].sht;
	probe_ent->host_flags = mv_port_info[board_idx].host_flags;
	probe_ent->pio_mask = mv_port_info[board_idx].pio_mask;
	probe_ent->udma_mask = mv_port_info[board_idx].udma_mask;
	probe_ent->port_ops = mv_port_info[board_idx].port_ops;

	probe_ent->irq = pdev->irq;
	probe_ent->irq_flags = SA_SHIRQ;
	probe_ent->mmio_base = mmio_base;
	probe_ent->private_data = hpriv;

	/* initialize adapter */
	rc = mv_host_init(probe_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]);
		}
	}

	/* FIXME: check ata_device_add return value */
	ata_device_add(probe_ent);
	kfree(probe_ent);

	return 0;

 err_out_hpriv:
	kfree(hpriv);
 err_out_iounmap:
	iounmap(mmio_base);
 err_out_free_ent:
	kfree(probe_ent);
 err_out_regions:
	pci_release_regions(pdev);
 err_out:
	if (!pci_dev_busy) {
		pci_disable_device(pdev);
	}

	return rc;
}

static int __init mv_init(void)
{
	return pci_module_init(&mv_pci_driver);
}

static void __exit mv_exit(void)
{
	pci_unregister_driver(&mv_pci_driver);
}

MODULE_AUTHOR("Brett Russ");
MODULE_DESCRIPTION("SCSI low-level driver for Marvell SATA controllers");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, mv_pci_tbl);
MODULE_VERSION(DRV_VERSION);

module_init(mv_init);
module_exit(mv_exit);