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path: root/include/linux/mv643xx_eth.h
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/*
 * MV-643XX ethernet platform device data definition file.
 */

#ifndef __LINUX_MV643XX_ETH_H
#define __LINUX_MV643XX_ETH_H

#include <linux/mbus.h>

#define MV643XX_ETH_SHARED_NAME		"mv643xx_eth"
#define MV643XX_ETH_NAME		"mv643xx_eth_port"
#define MV643XX_ETH_SHARED_REGS		0x2000
#define MV643XX_ETH_SHARED_REGS_SIZE	0x2000
#define MV643XX_ETH_BAR_4		0x2220
#define MV643XX_ETH_SIZE_REG_4		0x2224
#define MV643XX_ETH_BASE_ADDR_ENABLE_REG	0x2290

struct mv643xx_eth_shared_platform_data {
	struct mbus_dram_target_info	*dram;
	struct platform_device	*shared_smi;
	unsigned int		t_clk;
	/*
	 * Max packet size for Tx IP/Layer 4 checksum, when set to 0, default
	 * limit of 9KiB will be used.
	 */
	int			tx_csum_limit;
};

#define MV643XX_ETH_PHY_ADDR_DEFAULT	0
#define MV643XX_ETH_PHY_ADDR(x)		(0x80 | (x))
#define MV643XX_ETH_PHY_NONE		0xff

struct mv643xx_eth_platform_data {
	/*
	 * Pointer back to our parent instance, and our port number.
	 */
	struct platform_device	*shared;
	int			port_number;

	/*
	 * Whether a PHY is present, and if yes, at which address.
	 */
	int			phy_addr;

	/*
	 * Use this MAC address if it is valid, overriding the
	 * address that is already in the hardware.
	 */
	u8			mac_addr[6];

	/*
	 * If speed is 0, autonegotiation is enabled.
	 *   Valid values for speed: 0, SPEED_10, SPEED_100, SPEED_1000.
	 *   Valid values for duplex: DUPLEX_HALF, DUPLEX_FULL.
	 */
	int			speed;
	int			duplex;

	/*
	 * How many RX/TX queues to use.
	 */
	int			rx_queue_count;
	int			tx_queue_count;

	/*
	 * Override default RX/TX queue sizes if nonzero.
	 */
	int			rx_queue_size;
	int			tx_queue_size;

	/*
	 * Use on-chip SRAM for RX/TX descriptors if size is nonzero
	 * and sufficient to contain all descriptors for the requested
	 * ring sizes.
	 */
	unsigned long		rx_sram_addr;
	int			rx_sram_size;
	unsigned long		tx_sram_addr;
	int			tx_sram_size;
};


#endif
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/*
 *  sata_promise.c - Promise SATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *		    Mikael Pettersson <mikpe@it.uu.se>
 *  		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, 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, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware information only available under NDA.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/gfp.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <linux/libata.h>
#include "sata_promise.h"

#define DRV_NAME	"sata_promise"
#define DRV_VERSION	"2.12"

enum {
	PDC_MAX_PORTS		= 4,
	PDC_MMIO_BAR		= 3,
	PDC_MAX_PRD		= LIBATA_MAX_PRD - 1, /* -1 for ASIC PRD bug workaround */

	/* host register offsets (from host->iomap[PDC_MMIO_BAR]) */
	PDC_INT_SEQMASK		= 0x40,	/* Mask of asserted SEQ INTs */
	PDC_FLASH_CTL		= 0x44, /* Flash control register */
	PDC_PCI_CTL		= 0x48, /* PCI control/status reg */
	PDC_SATA_PLUG_CSR	= 0x6C, /* SATA Plug control/status reg */
	PDC2_SATA_PLUG_CSR	= 0x60, /* SATAII Plug control/status reg */
	PDC_TBG_MODE		= 0x41C, /* TBG mode (not SATAII) */
	PDC_SLEW_CTL		= 0x470, /* slew rate control reg (not SATAII) */

	/* per-port ATA register offsets (from ap->ioaddr.cmd_addr) */
	PDC_FEATURE		= 0x04, /* Feature/Error reg (per port) */
	PDC_SECTOR_COUNT	= 0x08, /* Sector count reg (per port) */
	PDC_SECTOR_NUMBER	= 0x0C, /* Sector number reg (per port) */
	PDC_CYLINDER_LOW	= 0x10, /* Cylinder low reg (per port) */
	PDC_CYLINDER_HIGH	= 0x14, /* Cylinder high reg (per port) */
	PDC_DEVICE		= 0x18, /* Device/Head reg (per port) */
	PDC_COMMAND		= 0x1C, /* Command/status reg (per port) */
	PDC_ALTSTATUS		= 0x38, /* Alternate-status/device-control reg (per port) */
	PDC_PKT_SUBMIT		= 0x40, /* Command packet pointer addr */
	PDC_GLOBAL_CTL		= 0x48, /* Global control/status (per port) */
	PDC_CTLSTAT		= 0x60,	/* IDE control and status (per port) */

	/* per-port SATA register offsets (from ap->ioaddr.scr_addr) */
	PDC_SATA_ERROR		= 0x04,
	PDC_PHYMODE4		= 0x14,
	PDC_LINK_LAYER_ERRORS	= 0x6C,
	PDC_FPDMA_CTLSTAT	= 0xD8,
	PDC_INTERNAL_DEBUG_1	= 0xF8,	/* also used for PATA */
	PDC_INTERNAL_DEBUG_2	= 0xFC,	/* also used for PATA */

	/* PDC_FPDMA_CTLSTAT bit definitions */
	PDC_FPDMA_CTLSTAT_RESET			= 1 << 3,
	PDC_FPDMA_CTLSTAT_DMASETUP_INT_FLAG	= 1 << 10,
	PDC_FPDMA_CTLSTAT_SETDB_INT_FLAG	= 1 << 11,

	/* PDC_GLOBAL_CTL bit definitions */
	PDC_PH_ERR		= (1 <<  8), /* PCI error while loading packet */
	PDC_SH_ERR		= (1 <<  9), /* PCI error while loading S/G table */
	PDC_DH_ERR		= (1 << 10), /* PCI error while loading data */
	PDC2_HTO_ERR		= (1 << 12), /* host bus timeout */
	PDC2_ATA_HBA_ERR	= (1 << 13), /* error during SATA DATA FIS transmission */
	PDC2_ATA_DMA_CNT_ERR	= (1 << 14), /* DMA DATA FIS size differs from S/G count */
	PDC_OVERRUN_ERR		= (1 << 19), /* S/G byte count larger than HD requires */
	PDC_UNDERRUN_ERR	= (1 << 20), /* S/G byte count less than HD requires */
	PDC_DRIVE_ERR		= (1 << 21), /* drive error */
	PDC_PCI_SYS_ERR		= (1 << 22), /* PCI system error */
	PDC1_PCI_PARITY_ERR	= (1 << 23), /* PCI parity error (from SATA150 driver) */
	PDC1_ERR_MASK		= PDC1_PCI_PARITY_ERR,
	PDC2_ERR_MASK		= PDC2_HTO_ERR | PDC2_ATA_HBA_ERR |
				  PDC2_ATA_DMA_CNT_ERR,
	PDC_ERR_MASK		= PDC_PH_ERR | PDC_SH_ERR | PDC_DH_ERR |
				  PDC_OVERRUN_ERR | PDC_UNDERRUN_ERR |
				  PDC_DRIVE_ERR | PDC_PCI_SYS_ERR |
				  PDC1_ERR_MASK | PDC2_ERR_MASK,

	board_2037x		= 0,	/* FastTrak S150 TX2plus */
	board_2037x_pata	= 1,	/* FastTrak S150 TX2plus PATA port */
	board_20319		= 2,	/* FastTrak S150 TX4 */
	board_20619		= 3,	/* FastTrak TX4000 */
	board_2057x		= 4,	/* SATAII150 Tx2plus */
	board_2057x_pata	= 5,	/* SATAII150 Tx2plus PATA port */
	board_40518		= 6,	/* SATAII150 Tx4 */

	PDC_HAS_PATA		= (1 << 1), /* PDC20375/20575 has PATA */

	/* Sequence counter control registers bit definitions */
	PDC_SEQCNTRL_INT_MASK	= (1 << 5), /* Sequence Interrupt Mask */

	/* Feature register values */
	PDC_FEATURE_ATAPI_PIO	= 0x00, /* ATAPI data xfer by PIO */
	PDC_FEATURE_ATAPI_DMA	= 0x01, /* ATAPI data xfer by DMA */

	/* Device/Head register values */
	PDC_DEVICE_SATA		= 0xE0, /* Device/Head value for SATA devices */

	/* PDC_CTLSTAT bit definitions */
	PDC_DMA_ENABLE		= (1 << 7),
	PDC_IRQ_DISABLE		= (1 << 10),
	PDC_RESET		= (1 << 11), /* HDMA reset */

	PDC_COMMON_FLAGS	= ATA_FLAG_PIO_POLLING,

	/* ap->flags bits */
	PDC_FLAG_GEN_II		= (1 << 24),
	PDC_FLAG_SATA_PATA	= (1 << 25), /* supports SATA + PATA */
	PDC_FLAG_4_PORTS	= (1 << 26), /* 4 ports */
};

struct pdc_port_priv {
	u8			*pkt;
	dma_addr_t		pkt_dma;
};

static int pdc_sata_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
static int pdc_sata_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
static int pdc_ata_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
static int pdc_common_port_start(struct ata_port *ap);
static int pdc_sata_port_start(struct ata_port *ap);
static void pdc_qc_prep(struct ata_queued_cmd *qc);
static void pdc_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf);
static void pdc_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf);
static int pdc_check_atapi_dma(struct ata_queued_cmd *qc);
static int pdc_old_sata_check_atapi_dma(struct ata_queued_cmd *qc);
static void pdc_irq_clear(struct ata_port *ap);
static unsigned int pdc_qc_issue(struct ata_queued_cmd *qc);
static void pdc_freeze(struct ata_port *ap);
static void pdc_sata_freeze(struct ata_port *ap);
static void pdc_thaw(struct ata_port *ap);
static void pdc_sata_thaw(struct ata_port *ap);
static int pdc_pata_softreset(struct ata_link *link, unsigned int *class,
			      unsigned long deadline);
static int pdc_sata_hardreset(struct ata_link *link, unsigned int *class,
			      unsigned long deadline);
static void pdc_error_handler(struct ata_port *ap);
static void pdc_post_internal_cmd(struct ata_queued_cmd *qc);
static int pdc_pata_cable_detect(struct ata_port *ap);
static int pdc_sata_cable_detect(struct ata_port *ap);

static struct scsi_host_template pdc_ata_sht = {
	ATA_BASE_SHT(DRV_NAME),
	.sg_tablesize		= PDC_MAX_PRD,
	.dma_boundary		= ATA_DMA_BOUNDARY,
};

static const struct ata_port_operations pdc_common_ops = {
	.inherits		= &ata_sff_port_ops,

	.sff_tf_load		= pdc_tf_load_mmio,
	.sff_exec_command	= pdc_exec_command_mmio,
	.check_atapi_dma	= pdc_check_atapi_dma,
	.qc_prep		= pdc_qc_prep,
	.qc_issue		= pdc_qc_issue,

	.sff_irq_clear		= pdc_irq_clear,
	.lost_interrupt		= ATA_OP_NULL,

	.post_internal_cmd	= pdc_post_internal_cmd,
	.error_handler		= pdc_error_handler,
};

static struct ata_port_operations pdc_sata_ops = {
	.inherits		= &pdc_common_ops,
	.cable_detect		= pdc_sata_cable_detect,
	.freeze			= pdc_sata_freeze,
	.thaw			= pdc_sata_thaw,
	.scr_read		= pdc_sata_scr_read,
	.scr_write		= pdc_sata_scr_write,
	.port_start		= pdc_sata_port_start,
	.hardreset		= pdc_sata_hardreset,
};

/* First-generation chips need a more restrictive ->check_atapi_dma op,
   and ->freeze/thaw that ignore the hotplug controls. */
static struct ata_port_operations pdc_old_sata_ops = {
	.inherits		= &pdc_sata_ops,
	.freeze			= pdc_freeze,
	.thaw			= pdc_thaw,
	.check_atapi_dma	= pdc_old_sata_check_atapi_dma,
};

static struct ata_port_operations pdc_pata_ops = {
	.inherits		= &pdc_common_ops,
	.cable_detect		= pdc_pata_cable_detect,
	.freeze			= pdc_freeze,
	.thaw			= pdc_thaw,
	.port_start		= pdc_common_port_start,
	.softreset		= pdc_pata_softreset,
};

static const struct ata_port_info pdc_port_info[] = {
	[board_2037x] =
	{
		.flags		= PDC_COMMON_FLAGS | ATA_FLAG_SATA |
				  PDC_FLAG_SATA_PATA,
		.pio_mask	= ATA_PIO4,
		.mwdma_mask	= ATA_MWDMA2,
		.udma_mask	= ATA_UDMA6,
		.port_ops	= &pdc_old_sata_ops,
	},

	[board_2037x_pata] =
	{
		.flags		= PDC_COMMON_FLAGS | ATA_FLAG_SLAVE_POSS,
		.pio_mask	= ATA_PIO4,
		.mwdma_mask	= ATA_MWDMA2,
		.udma_mask	= ATA_UDMA6,
		.port_ops	= &pdc_pata_ops,
	},

	[board_20319] =
	{
		.flags		= PDC_COMMON_FLAGS | ATA_FLAG_SATA |
				  PDC_FLAG_4_PORTS,
		.pio_mask	= ATA_PIO4,
		.mwdma_mask	= ATA_MWDMA2,
		.udma_mask	= ATA_UDMA6,
		.port_ops	= &pdc_old_sata_ops,
	},

	[board_20619] =
	{
		.flags		= PDC_COMMON_FLAGS | ATA_FLAG_SLAVE_POSS |
				  PDC_FLAG_4_PORTS,
		.pio_mask	= ATA_PIO4,
		.mwdma_mask	= ATA_MWDMA2,
		.udma_mask	= ATA_UDMA6,
		.port_ops	= &pdc_pata_ops,
	},

	[board_2057x] =
	{
		.flags		= PDC_COMMON_FLAGS | ATA_FLAG_SATA |
				  PDC_FLAG_GEN_II | PDC_FLAG_SATA_PATA,
		.pio_mask	= ATA_PIO4,
		.mwdma_mask	= ATA_MWDMA2,
		.udma_mask	= ATA_UDMA6,
		.port_ops	= &pdc_sata_ops,
	},

	[board_2057x_pata] =
	{
		.flags		= PDC_COMMON_FLAGS | ATA_FLAG_SLAVE_POSS |
				  PDC_FLAG_GEN_II,
		.pio_mask	= ATA_PIO4,
		.mwdma_mask	= ATA_MWDMA2,
		.udma_mask	= ATA_UDMA6,
		.port_ops	= &pdc_pata_ops,
	},

	[board_40518] =
	{
		.flags		= PDC_COMMON_FLAGS | ATA_FLAG_SATA |
				  PDC_FLAG_GEN_II | PDC_FLAG_4_PORTS,
		.pio_mask	= ATA_PIO4,
		.mwdma_mask	= ATA_MWDMA2,
		.udma_mask	= ATA_UDMA6,
		.port_ops	= &pdc_sata_ops,
	},
};

static const struct pci_device_id pdc_ata_pci_tbl[] = {
	{ PCI_VDEVICE(PROMISE, 0x3371), board_2037x },
	{ PCI_VDEVICE(PROMISE, 0x3373), board_2037x },
	{ PCI_VDEVICE(PROMISE, 0x3375), board_2037x },
	{ PCI_VDEVICE(PROMISE, 0x3376), board_2037x },
	{ PCI_VDEVICE(PROMISE, 0x3570), board_2057x },
	{ PCI_VDEVICE(PROMISE, 0x3571), board_2057x },
	{ PCI_VDEVICE(PROMISE, 0x3574), board_2057x },
	{ PCI_VDEVICE(PROMISE, 0x3577), board_2057x },
	{ PCI_VDEVICE(PROMISE, 0x3d73), board_2057x },
	{ PCI_VDEVICE(PROMISE, 0x3d75), board_2057x },

	{ PCI_VDEVICE(PROMISE, 0x3318), board_20319 },
	{ PCI_VDEVICE(PROMISE, 0x3319), board_20319 },
	{ PCI_VDEVICE(PROMISE, 0x3515), board_40518 },
	{ PCI_VDEVICE(PROMISE, 0x3519), board_40518 },
	{ PCI_VDEVICE(PROMISE, 0x3d17), board_40518 },
	{ PCI_VDEVICE(PROMISE, 0x3d18), board_40518 },

	{ PCI_VDEVICE(PROMISE, 0x6629), board_20619 },

	{ }	/* terminate list */
};

static struct pci_driver pdc_ata_pci_driver = {
	.name			= DRV_NAME,
	.id_table		= pdc_ata_pci_tbl,
	.probe			= pdc_ata_init_one,
	.remove			= ata_pci_remove_one,
};

static int pdc_common_port_start(struct ata_port *ap)
{
	struct device *dev = ap->host->dev;
	struct pdc_port_priv *pp;
	int rc;

	/* we use the same prd table as bmdma, allocate it */
	rc = ata_bmdma_port_start(ap);
	if (rc)
		return rc;

	pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
	if (!pp)
		return -ENOMEM;

	pp->pkt = dmam_alloc_coherent(dev, 128, &pp->pkt_dma, GFP_KERNEL);
	if (!pp->pkt)
		return -ENOMEM;

	ap->private_data = pp;

	return 0;
}

static int pdc_sata_port_start(struct ata_port *ap)
{
	int rc;

	rc = pdc_common_port_start(ap);
	if (rc)
		return rc;

	/* fix up PHYMODE4 align timing */
	if (ap->flags & PDC_FLAG_GEN_II) {
		void __iomem *sata_mmio = ap->ioaddr.scr_addr;
		unsigned int tmp;

		tmp = readl(sata_mmio + PDC_PHYMODE4);
		tmp = (tmp & ~3) | 1;	/* set bits 1:0 = 0:1 */
		writel(tmp, sata_mmio + PDC_PHYMODE4);
	}

	return 0;
}

static void pdc_fpdma_clear_interrupt_flag(struct ata_port *ap)
{
	void __iomem *sata_mmio = ap->ioaddr.scr_addr;
	u32 tmp;

	tmp = readl(sata_mmio + PDC_FPDMA_CTLSTAT);
	tmp |= PDC_FPDMA_CTLSTAT_DMASETUP_INT_FLAG;
	tmp |= PDC_FPDMA_CTLSTAT_SETDB_INT_FLAG;

	/* It's not allowed to write to the entire FPDMA_CTLSTAT register
	   when NCQ is running. So do a byte-sized write to bits 10 and 11. */
	writeb(tmp >> 8, sata_mmio + PDC_FPDMA_CTLSTAT + 1);
	readb(sata_mmio + PDC_FPDMA_CTLSTAT + 1); /* flush */
}

static void pdc_fpdma_reset(struct ata_port *ap)
{
	void __iomem *sata_mmio = ap->ioaddr.scr_addr;
	u8 tmp;

	tmp = (u8)readl(sata_mmio + PDC_FPDMA_CTLSTAT);
	tmp &= 0x7F;
	tmp |= PDC_FPDMA_CTLSTAT_RESET;
	writeb(tmp, sata_mmio + PDC_FPDMA_CTLSTAT);
	readl(sata_mmio + PDC_FPDMA_CTLSTAT); /* flush */
	udelay(100);
	tmp &= ~PDC_FPDMA_CTLSTAT_RESET;
	writeb(tmp, sata_mmio + PDC_FPDMA_CTLSTAT);
	readl(sata_mmio + PDC_FPDMA_CTLSTAT); /* flush */

	pdc_fpdma_clear_interrupt_flag(ap);
}

static void pdc_not_at_command_packet_phase(struct ata_port *ap)
{
	void __iomem *sata_mmio = ap->ioaddr.scr_addr;
	unsigned int i;
	u32 tmp;

	/* check not at ASIC packet command phase */
	for (i = 0; i < 100; ++i) {
		writel(0, sata_mmio + PDC_INTERNAL_DEBUG_1);
		tmp = readl(sata_mmio + PDC_INTERNAL_DEBUG_2);
		if ((tmp & 0xF) != 1)
			break;
		udelay(100);
	}
}

static void pdc_clear_internal_debug_record_error_register(struct ata_port *ap)
{
	void __iomem *sata_mmio = ap->ioaddr.scr_addr;

	writel(0xffffffff, sata_mmio + PDC_SATA_ERROR);
	writel(0xffff0000, sata_mmio + PDC_LINK_LAYER_ERRORS);
}

static void pdc_reset_port(struct ata_port *ap)
{
	void __iomem *ata_ctlstat_mmio = ap->ioaddr.cmd_addr + PDC_CTLSTAT;
	unsigned int i;
	u32 tmp;

	if (ap->flags & PDC_FLAG_GEN_II)
		pdc_not_at_command_packet_phase(ap);

	tmp = readl(ata_ctlstat_mmio);
	tmp |= PDC_RESET;
	writel(tmp, ata_ctlstat_mmio);

	for (i = 11; i > 0; i--) {
		tmp = readl(ata_ctlstat_mmio);
		if (tmp & PDC_RESET)
			break;

		udelay(100);

		tmp |= PDC_RESET;
		writel(tmp, ata_ctlstat_mmio);
	}

	tmp &= ~PDC_RESET;
	writel(tmp, ata_ctlstat_mmio);
	readl(ata_ctlstat_mmio);	/* flush */

	if (sata_scr_valid(&ap->link) && (ap->flags & PDC_FLAG_GEN_II)) {
		pdc_fpdma_reset(ap);
		pdc_clear_internal_debug_record_error_register(ap);
	}
}

static int pdc_pata_cable_detect(struct ata_port *ap)
{
	u8 tmp;
	void __iomem *ata_mmio = ap->ioaddr.cmd_addr;

	tmp = readb(ata_mmio + PDC_CTLSTAT + 3);
	if (tmp & 0x01)
		return ATA_CBL_PATA40;
	return ATA_CBL_PATA80;
}

static int pdc_sata_cable_detect(struct ata_port *ap)
{
	return ATA_CBL_SATA;
}

static int pdc_sata_scr_read(struct ata_link *link,
			     unsigned int sc_reg, u32 *val)
{
	if (sc_reg > SCR_CONTROL)
		return -EINVAL;
	*val = readl(link->ap->ioaddr.scr_addr + (sc_reg * 4));
	return 0;
}

static int pdc_sata_scr_write(struct ata_link *link,
			      unsigned int sc_reg, u32 val)
{
	if (sc_reg > SCR_CONTROL)
		return -EINVAL;
	writel(val, link->ap->ioaddr.scr_addr + (sc_reg * 4));
	return 0;
}

static void pdc_atapi_pkt(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	dma_addr_t sg_table = ap->bmdma_prd_dma;
	unsigned int cdb_len = qc->dev->cdb_len;
	u8 *cdb = qc->cdb;
	struct pdc_port_priv *pp = ap->private_data;
	u8 *buf = pp->pkt;
	__le32 *buf32 = (__le32 *) buf;
	unsigned int dev_sel, feature;

	/* set control bits (byte 0), zero delay seq id (byte 3),
	 * and seq id (byte 2)
	 */
	switch (qc->tf.protocol) {
	case ATAPI_PROT_DMA:
		if (!(qc->tf.flags & ATA_TFLAG_WRITE))
			buf32[0] = cpu_to_le32(PDC_PKT_READ);
		else
			buf32[0] = 0;
		break;
	case ATAPI_PROT_NODATA:
		buf32[0] = cpu_to_le32(PDC_PKT_NODATA);
		break;
	default:
		BUG();
		break;
	}
	buf32[1] = cpu_to_le32(sg_table);	/* S/G table addr */
	buf32[2] = 0;				/* no next-packet */

	/* select drive */
	if (sata_scr_valid(&ap->link))
		dev_sel = PDC_DEVICE_SATA;
	else
		dev_sel = qc->tf.device;

	buf[12] = (1 << 5) | ATA_REG_DEVICE;
	buf[13] = dev_sel;
	buf[14] = (1 << 5) | ATA_REG_DEVICE | PDC_PKT_CLEAR_BSY;
	buf[15] = dev_sel; /* once more, waiting for BSY to clear */

	buf[16] = (1 << 5) | ATA_REG_NSECT;
	buf[17] = qc->tf.nsect;
	buf[18] = (1 << 5) | ATA_REG_LBAL;
	buf[19] = qc->tf.lbal;

	/* set feature and byte counter registers */
	if (qc->tf.protocol != ATAPI_PROT_DMA)
		feature = PDC_FEATURE_ATAPI_PIO;
	else
		feature = PDC_FEATURE_ATAPI_DMA;

	buf[20] = (1 << 5) | ATA_REG_FEATURE;
	buf[21] = feature;
	buf[22] = (1 << 5) | ATA_REG_BYTEL;
	buf[23] = qc->tf.lbam;
	buf[24] = (1 << 5) | ATA_REG_BYTEH;
	buf[25] = qc->tf.lbah;

	/* send ATAPI packet command 0xA0 */
	buf[26] = (1 << 5) | ATA_REG_CMD;
	buf[27] = qc->tf.command;

	/* select drive and check DRQ */
	buf[28] = (1 << 5) | ATA_REG_DEVICE | PDC_PKT_WAIT_DRDY;
	buf[29] = dev_sel;

	/* we can represent cdb lengths 2/4/6/8/10/12/14/16 */
	BUG_ON(cdb_len & ~0x1E);

	/* append the CDB as the final part */
	buf[30] = (((cdb_len >> 1) & 7) << 5) | ATA_REG_DATA | PDC_LAST_REG;
	memcpy(buf+31, cdb, cdb_len);
}

/**