Re: PATCH: Initial PATA driver for SiS chipset IDE

Alan Cox wrote:

This is mostly a port of the drivers/ide/pci driver by Lionel and
Vojtech to the new libata layer. Bugs excepted it's functionally
equivalent to the old driver with the patch I sent for that one earlier.

Tested on the SiS chipsets I have here running a full Fedora Core 4.

Alan

Signed-off-by: Alan Cox <[email protected]>

/*
 *    pata_sis.c - SiS ATA driver
 *
 *	(C) 2005 Red Hat <[email protected]>


It's now 2006 :)

 *    Based upon linux/drivers/ide/pci/sis5513.c
 * Copyright (C) 1999-2000	Andre Hedrick <[email protected]>
 * Copyright (C) 2002		Lionel Bouton <[email protected]>, Maintainer
 * Copyright (C) 2003		Vojtech Pavlik <[email protected]>
 * SiS Taiwan		: for direct support and hardware.
 * Daniela Engert	: for initial ATA100 advices and numerous others.
 * John Fremlin, Manfred Spraul, Dave Morgan, Peter Kjellerstedt	:
 *			  for checking code correctness, providing patches.
 * Original tests and design on the SiS620 chipset.
 * ATA100 tests and design on the SiS735 chipset.
 * ATA16/33 support from specs
 * ATA133 support for SiS961/962 by L.C. Chang <[email protected]>
 *
 *
 *	TODO
 *	Check MWDMA on drives that don't support MWDMA speed pio cycles ?
 *	More Testing
 */

#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/device.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/ata.h>

#define DRV_NAME	"pata_sis"
#define DRV_VERSION	"0.1"

struct sis_chipset {
	u16 device;			/* PCI host ID */
	struct ata_port_info *info;	/* Info block */
	/* Probably add family, cable detect type etc here to clean
	   up code later */
};

/**
 *	sis_133_cable_detect	-	check for 40/80 pin
 *	@ap: Port
 *
 *	Perform cable detection for the later UDMA133 capable
 *	SiS chipset.
 */

static int sis_133_cable_detect(struct ata_port *ap)

{
	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
	u16 tmp;
	
	pci_read_config_word(pdev, 0x50 + 2 * ap->hard_port_no, &tmp);
	if(tmp & 0x8000)


space

		return ATA_CBL_PATA40;
	return ATA_CBL_PATA80;
}

/**
 *	sis_phy_reset - Probe specified port on PATA host controller
 *	@ap: Port to probe
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static void sis_133_phy_reset(struct ata_port *ap)
{
	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
	static struct pci_bits sis_enable_bits[] = {


const

		{ 0x4aU, 1U, 0x02UL, 0x02UL },	/* port 0 */
		{ 0x4aU, 1U, 0x04UL, 0x04UL },	/* port 1 */
	};

	if (!pci_test_config_bits(pdev, &sis_enable_bits[ap->hard_port_no])) {
		ata_port_disable(ap);
		printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
		return;
	}
	ap->cbl = sis_133_cable_detect(ap);
	ata_port_probe(ap);
	ata_bus_reset(ap);
}


/**
 *	sis_66_cable_detect	-	check for 40/80 pin
 *	@ap: Port
 *
 *	Perform cable detection on the UDMA66, UDMA100 and early UDMA133
 *	SiS IDE controllers.
 */

static int sis_66_cable_detect(struct ata_port *ap)

{
	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
	u8 tmp;
	
	pci_read_config_byte(pdev, 0x48, &tmp);
	tmp >>= ap->hard_port_no;
	if(tmp & 0x10)


space

		return ATA_CBL_PATA40;
	return ATA_CBL_PATA80;
}

/**
 *	sis_66_phy_reset - Probe specified port on PATA host controller
 *	@ap: Port to probe
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static void sis_66_phy_reset(struct ata_port *ap)
{
	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
	static struct pci_bits sis_enable_bits[] = {
		{ 0x4aU, 1U, 0x02UL, 0x02UL },	/* port 0 */
		{ 0x4aU, 1U, 0x04UL, 0x04UL },	/* port 1 */
	};


const

	if (!pci_test_config_bits(pdev, &sis_enable_bits[ap->hard_port_no])) {
		ata_port_disable(ap);
		printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
		return;
	}
	ap->cbl = sis_66_cable_detect(ap);
	ata_port_probe(ap);
	ata_bus_reset(ap);
}


/**
 *	sis_old_phy_reset - Probe specified port on PATA host controller
 *	@ap: Port to probe
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static void sis_old_phy_reset(struct ata_port *ap)
{
	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
	static struct pci_bits sis_enable_bits[] = {
		{ 0x4aU, 1U, 0x02UL, 0x02UL },	/* port 0 */
		{ 0x4aU, 1U, 0x04UL, 0x04UL },	/* port 1 */
	};


const

	if (!pci_test_config_bits(pdev, &sis_enable_bits[ap->hard_port_no])) {
		ata_port_disable(ap);
		printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
		return;
	}
	ap->cbl = ATA_CBL_PATA40;
	ata_port_probe(ap);
	ata_bus_reset(ap);
}

/**
 *	sis_set_fifo	-	Set RWP fifo bits for this device
 *	@ap: Port
 *	@adev: Device
 *
 *	SIS chipsets implement prefetch/postwrite bits for each device
 *	on both channels. This functionality is not ATAPI compatible and
 *	must be configured according to the class of device present
 */

static void sis_set_fifo(struct ata_port *ap, struct ata_device *adev)

{
	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
	u8 reg4b;

When the verbalization of a magic constant creeps into the naming of avariable, you know it's time to replace some magic numbers with namedconstants...

	u8 mask = 0x11;
	
	mask <<= (2 * ap->hard_port_no);
	mask <<= adev->devno;
	
	pci_read_config_byte(pdev, 0x4B, &reg4b);
	reg4b &= ~mask;
	
	/* Enable for ATA (disk) only */
	if(adev->class == ATA_DEV_ATA)


space

		reg4b |= mask;
	pci_write_config_byte(pdev, 0x4B, reg4b);
}

/**
 *	sis_old_set_piomode - Initialize host controller PATA PIO timings
 *	@ap: Port whose timings we are configuring
 *	@adev: Device we are configuring for.
 *
 *	Set PIO mode for device, in host controller PCI config space. This
 *	function handles PIO set up for all chips that are pre ATA100 and
 *	also early ATA100 devices.
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static void sis_old_set_piomode (struct ata_port *ap, struct ata_device *adev)
{
	struct pci_dev *pdev	= to_pci_dev(ap->host_set->dev);
	int port = 0x40 + 4 * ap->hard_port_no +  2 * adev->devno;
	u8 t1, t2;
	int speed = adev->pio_mode - XFER_PIO_0;
	
	const u8 active[]   = { 0x00, 0x07, 0x04, 0x03, 0x01 };
	const u8 recovery[] = { 0x00, 0x06, 0x04, 0x03, 0x03 };
	
	sis_set_fifo(ap, adev);
	
	pci_read_config_byte(pdev, port, &t1);
	pci_read_config_byte(pdev, port + 1, &t2);
	
	t1 &= ~0x0F;	/* Clear active/recovery timings */
	t2 &= ~0x07;
	
	t1 |= active[speed];
	t2 |= recovery[speed];
	
	pci_write_config_byte(pdev, port, t1);
	pci_write_config_byte(pdev, port + 1, t2);
}

/**
 *	sis_100_set_pioode - Initialize host controller PATA PIO timings
 *	@ap: Port whose timings we are configuring
 *	@adev: Device we are configuring for.
 *
 *	Set PIO mode for device, in host controller PCI config space. This
 *	function handles PIO set up for ATA100 devices and early ATA133.
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static void sis_100_set_piomode (struct ata_port *ap, struct ata_device *adev)
{
	struct pci_dev *pdev	= to_pci_dev(ap->host_set->dev);
	int port = 0x40 + 4 * ap->hard_port_no +  2 * adev->devno;
	int speed = adev->pio_mode - XFER_PIO_0;
	
	const u8 actrec[] = { 0x00, 0x67, 0x44, 0x33, 0x31 };
	
	sis_set_fifo(ap, adev);
	
	pci_write_config_byte(pdev, port, actrec[speed]);
}

/**
 *	sis_133_set_pioode - Initialize host controller PATA PIO timings
 *	@ap: Port whose timings we are configuring
 *	@adev: Device we are configuring for.
 *
 *	Set PIO mode for device, in host controller PCI config space. This
 *	function handles PIO set up for the later ATA133 devices.
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static void sis_133_set_piomode (struct ata_port *ap, struct ata_device *adev)
{
	struct pci_dev *pdev	= to_pci_dev(ap->host_set->dev);
	int port = 0x40;
	u32 t1;
	u32 reg54;
	int speed = adev->pio_mode - XFER_PIO_0;

	const u32 timing100[] = {
		0x28269000,	/* Recovery << 24 | Act << 16 | Ini << 12 */
		0x0C266000,
		0x04263000,
		0x0C0A3000,
		0x05093000
	};
	const u32 timing133[] = {
		0x1E1C6000,	/* Recovery << 24 | Act << 16 | Ini << 12 */
		0x091C4000,
		0x031C2000,
		0x09072000,
		0x04062000
	};

	sis_set_fifo(ap, adev);

	pci_read_config_dword(pdev, 0x54, &reg54);
	if(reg54 & 0x40000000)
		port = 0x70;
	port += 8 * ap->hard_port_no +  4 * adev->devno;

	pci_read_config_dword(pdev, port, &t1);
	t1 &= 0xC0C00FFF;	/* Mask out timing */
	
	if(t1 & 0x08)		/* 100 or 133 ? */
		t1 |= timing133[speed];
	else
		t1 |= timing100[speed];
	pci_write_config_byte(pdev, port, t1);
}

/**
 *	sis_old_set_dmamode - Initialize host controller PATA DMA timings
 *	@ap: Port whose timings we are configuring
 *	@adev: Device to program
 *
 *	Set UDMA/MWDMA mode for device, in host controller PCI config space.
 *	Handles pre UDMA and UDMA33 devices. Supports MWDMA as well unlike
 *	the old ide/pci driver.
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static void sis_old_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{
	struct pci_dev *pdev	= to_pci_dev(ap->host_set->dev);
	int speed = adev->dma_mode - XFER_MW_DMA_0;
	int drive_pci = 0x40 + 4 * ap->hard_port_no + 2 * adev->devno;
	u16 timing;
	
	const u16 mwdma_bits[] = { 0x707, 0x202, 0x202 };
	const u16 udma_bits[]  = {

0xE000, 0xC000, 0xA000};

	
	pci_read_config_word(pdev, drive_pci, &timing);
	
	if(adev->dma_mode < XFER_UDMA_0) {


space

		/* bits 3-0 hold recovery timing bits 8-10 active timing and
		   the higer bits are dependant on the device */
		timing &= ~ 0x870F;
		timing |= mwdma_bits[speed];
		pci_write_config_word(pdev, drive_pci, timing);
	} else {
		/* Bit 15 is UDMA on/off, bit 13-14 are cycle time */
		speed = adev->dma_mode - XFER_UDMA_0;
		timing &= ~0x6000;
		timing |= udma_bits[speed];
	}
}

/**
 *	sis_66_set_dmamode - Initialize host controller PATA DMA timings
 *	@ap: Port whose timings we are configuring
 *	@adev: Device to program
 *
 *	Set UDMA/MWDMA mode for device, in host controller PCI config space.
 *	Handles UDMA66 and early UDMA100 devices. Supports MWDMA as well unlike
 *	the old ide/pci driver.
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static void sis_66_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{
	struct pci_dev *pdev	= to_pci_dev(ap->host_set->dev);
	int speed = adev->dma_mode - XFER_MW_DMA_0;
	int drive_pci = 0x40 + 4 * ap->hard_port_no + 2 * adev->devno;
	u16 timing;
	
	const u16 mwdma_bits[] = { 0x707, 0x202, 0x202 };
	const u16 udma_bits[]  = { 0xF000, 0xD000, 0xB000, 0xA000, 0x9000};
	
	pci_read_config_word(pdev, drive_pci, &timing);
	
	if(adev->dma_mode < XFER_UDMA_0) {


space

		/* bits 3-0 hold recovery timing bits 8-10 active timing and
		   the higer bits are dependant on the device, bit 15 udma */
		timing &= ~ 0x870F;
		timing |= mwdma_bits[speed];
	} else {
		/* Bit 15 is UDMA on/off, bit 12-14 are cycle time */
		speed = adev->dma_mode - XFER_UDMA_0;
		timing &= ~0x6000;
		timing |= udma_bits[speed];
	}
	pci_write_config_word(pdev, drive_pci, timing);
}

/**
 *	sis_100_set_dmamode - Initialize host controller PATA DMA timings
 *	@ap: Port whose timings we are configuring
 *	@adev: Device to program
 *
 *	Set UDMA/MWDMA mode for device, in host controller PCI config space.

* Handles UDMA66 and early UDMA100 devices.*

 *	LOCKING:
 *	None (inherited from caller).
 */

static void sis_100_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{
	struct pci_dev *pdev	= to_pci_dev(ap->host_set->dev);
	int speed = adev->dma_mode - XFER_MW_DMA_0;
	int drive_pci = 0x40 + 4 * ap->hard_port_no + 2 * adev->devno;
	u16 timing;

	const u16 udma_bits[]  = { 0x8B00, 0x8700, 0x8500, 0x8300, 0x8200, 0x8100};
	
	pci_read_config_word(pdev, drive_pci, &timing);
	
	if(adev->dma_mode < XFER_UDMA_0) {


space

		/* NOT SUPPORTED YET: NEED DATA SHEET. DITTO IN OLD DRIVER */
	} else {
		/* Bit 15 is UDMA on/off, bit 12-14 are cycle time */
		speed = adev->dma_mode - XFER_UDMA_0;
		timing &= ~0x0F00;
		timing |= udma_bits[speed];
	}
	pci_write_config_word(pdev, drive_pci, timing);
}

/**
 *	sis_133_early_set_dmamode - Initialize host controller PATA DMA timings
 *	@ap: Port whose timings we are configuring
 *	@adev: Device to program
 *
 *	Set UDMA/MWDMA mode for device, in host controller PCI config space.
 *	Handles early SiS 961 bridges. Supports MWDMA as well unlike
 *	the old ide/pci driver.
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static void sis_133_early_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{
	struct pci_dev *pdev	= to_pci_dev(ap->host_set->dev);
	int speed = adev->dma_mode - XFER_MW_DMA_0;
	int drive_pci = 0x40 + 4 * ap->hard_port_no + 2 * adev->devno;
	u16 timing;
	
	const u16 udma_bits[]  = { 0x8F00, 0x8A00, 0x8700, 0x8500, 0x8300, 0x8200, 0x8100};
	
	pci_read_config_word(pdev, drive_pci, &timing);
	
	if(adev->dma_mode < XFER_UDMA_0) {


space

		/* NOT SUPPORTED YET: NEED DATA SHEET. DITTO IN OLD DRIVER */
	} else {
		/* Bit 15 is UDMA on/off, bit 12-14 are cycle time */
		speed = adev->dma_mode - XFER_UDMA_0;
		timing &= ~0x0F00;
		timing |= udma_bits[speed];
	}
	pci_write_config_word(pdev, drive_pci, timing);
}

/**
 *	sis_133_set_dmamode - Initialize host controller PATA DMA timings
 *	@ap: Port whose timings we are configuring
 *	@adev: Device to program
 *
 *	Set UDMA/MWDMA mode for device, in host controller PCI config space.
 *	Handles early SiS 961 bridges. Supports MWDMA as well unlike
 *	the old ide/pci driver.
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static void sis_133_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{
	struct pci_dev *pdev	= to_pci_dev(ap->host_set->dev);
	int speed = adev->dma_mode - XFER_MW_DMA_0;
	int port = 0x40;
	u32 t1;
	u32 reg54;
	
	/* bits 4- cycle time 8 - cvs time */
	const u32 timing_u100[] = { 0x6B0, 0x470, 0x350, 0x140, 0x120, 0x110, 0x000 };
	const u32 timing_u133[] = { 0x9F0, 0x6A0, 0x470, 0x250, 0x230, 0x220, 0x210 };
	
	pci_read_config_dword(pdev, 0x54, &reg54);
	if(reg54 & 0x40000000)


space

		port = 0x70;
	port += 8 * ap->hard_port_no +  4 * adev->devno;
	
	pci_read_config_dword(pdev, port, &t1);
	
	if(adev->dma_mode < XFER_UDMA_0) {


space

		t1 &= ~0x00000004;
		/* FIXME: need data sheet to add MWDMA here. Also lacking on
		   ide/pci driver */
	} else {
		speed = adev->dma_mode - XFER_UDMA_0;
		/* if & 8 no UDMA133 - need info for ... */
		t1 &= ~0x00000FF0;
		t1 |= 0x00000004;
		if(t1 & 0x08)
			t1 |= timing_u133[speed];
		else
			t1 |= timing_u100[speed];
	}
	pci_write_config_dword(pdev, port, t1);
}

static struct scsi_host_template sis_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		= LIBATA_MAX_PRD,
	.max_sectors		= ATA_MAX_SECTORS,
	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
	.emulated		= ATA_SHT_EMULATED,
	.use_clustering		= ATA_SHT_USE_CLUSTERING,
	.proc_name		= DRV_NAME,
	.dma_boundary		= ATA_DMA_BOUNDARY,
	.slave_configure	= ata_scsi_slave_config,
	.bios_param		= ata_std_bios_param,
	.ordered_flush		= 1,
};

static const struct ata_port_operations sis_133_ops = {
	.port_disable		= ata_port_disable,
	.set_piomode		= sis_133_set_piomode,
	.set_dmamode		= sis_133_set_dmamode,

	.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		= sis_133_phy_reset,

	.bmdma_setup		= ata_bmdma_setup,
	.bmdma_start		= ata_bmdma_start,
	.bmdma_stop		= ata_bmdma_stop,
	.bmdma_status		= ata_bmdma_status,
	.qc_prep		= ata_qc_prep,
	.qc_issue		= ata_qc_issue_prot,

	.eng_timeout		= ata_eng_timeout,

	.irq_handler		= ata_interrupt,
	.irq_clear		= ata_bmdma_irq_clear,

	.port_start		= ata_port_start,
	.port_stop		= ata_port_stop,
	.host_stop		= ata_host_stop,
};

static const struct ata_port_operations sis_133_early_ops = {
	.port_disable		= ata_port_disable,
	.set_piomode		= sis_100_set_piomode,
	.set_dmamode		= sis_133_early_set_dmamode,

	.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		= sis_66_phy_reset,

	.bmdma_setup		= ata_bmdma_setup,
	.bmdma_start		= ata_bmdma_start,
	.bmdma_stop		= ata_bmdma_stop,
	.bmdma_status		= ata_bmdma_status,
	.qc_prep		= ata_qc_prep,
	.qc_issue		= ata_qc_issue_prot,

	.eng_timeout		= ata_eng_timeout,

	.irq_handler		= ata_interrupt,
	.irq_clear		= ata_bmdma_irq_clear,

	.port_start		= ata_port_start,
	.port_stop		= ata_port_stop,
	.host_stop		= ata_host_stop,
};

static const struct ata_port_operations sis_100_ops = {
	.port_disable		= ata_port_disable,
	.set_piomode		= sis_100_set_piomode,
	.set_dmamode		= sis_100_set_dmamode,

	.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		= sis_66_phy_reset,

	.bmdma_setup		= ata_bmdma_setup,
	.bmdma_start		= ata_bmdma_start,
	.bmdma_stop		= ata_bmdma_stop,
	.bmdma_status		= ata_bmdma_status,
	.qc_prep		= ata_qc_prep,
	.qc_issue		= ata_qc_issue_prot,

	.eng_timeout		= ata_eng_timeout,

	.irq_handler		= ata_interrupt,
	.irq_clear		= ata_bmdma_irq_clear,

	.port_start		= ata_port_start,
	.port_stop		= ata_port_stop,
	.host_stop		= ata_host_stop,
};

static const struct ata_port_operations sis_66_ops = {
	.port_disable		= ata_port_disable,
	.set_piomode		= sis_old_set_piomode,
	.set_dmamode		= sis_66_set_dmamode,

	.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		= sis_66_phy_reset,

	.bmdma_setup		= ata_bmdma_setup,
	.bmdma_start		= ata_bmdma_start,
	.bmdma_stop		= ata_bmdma_stop,
	.bmdma_status		= ata_bmdma_status,
	.qc_prep		= ata_qc_prep,
	.qc_issue		= ata_qc_issue_prot,

	.eng_timeout		= ata_eng_timeout,

	.irq_handler		= ata_interrupt,
	.irq_clear		= ata_bmdma_irq_clear,

	.port_start		= ata_port_start,
	.port_stop		= ata_port_stop,
	.host_stop		= ata_host_stop,
};

static const struct ata_port_operations sis_old_ops = {
	.port_disable		= ata_port_disable,
	.set_piomode		= sis_old_set_piomode,
	.set_dmamode		= sis_old_set_dmamode,

	.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		= sis_old_phy_reset,

	.bmdma_setup		= ata_bmdma_setup,
	.bmdma_start		= ata_bmdma_start,
	.bmdma_stop		= ata_bmdma_stop,
	.bmdma_status		= ata_bmdma_status,
	.qc_prep		= ata_qc_prep,
	.qc_issue		= ata_qc_issue_prot,

	.eng_timeout		= ata_eng_timeout,

	.irq_handler		= ata_interrupt,
	.irq_clear		= ata_bmdma_irq_clear,

	.port_start		= ata_port_start,
	.port_stop		= ata_port_stop,
	.host_stop		= ata_host_stop,
};

static struct ata_port_info sis_info = {
	.sht		= &sis_sht,
	.host_flags	= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
	.pio_mask	= 0x1f,	/* pio0-4 */
	.mwdma_mask	= 0x07,
	.udma_mask	= 0,
	.port_ops	= &sis_old_ops,
};
static struct ata_port_info sis_info33 = {
	.sht		= &sis_sht,
	.host_flags	= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
	.pio_mask	= 0x1f,	/* pio0-4 */
	.mwdma_mask	= 0x07,
	.udma_mask	= ATA_UDMA2,	/* UDMA 33 */
	.port_ops	= &sis_old_ops,
};
static struct ata_port_info sis_info66 = {
	.sht		= &sis_sht,
	.host_flags	= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
	.pio_mask	= 0x1f,	/* pio0-4 */
	.udma_mask	= ATA_UDMA4,	/* UDMA 66 */
	.port_ops	= &sis_66_ops,
};
static struct ata_port_info sis_info100 = {
	.sht		= &sis_sht,
	.host_flags	= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
	.pio_mask	= 0x1f,	/* pio0-4 */
	.udma_mask	= ATA_UDMA5,
	.port_ops	= &sis_100_ops,
};
static struct ata_port_info sis_info100_early = {
	.sht		= &sis_sht,
	.host_flags	= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
	.udma_mask	= ATA_UDMA5,
	.pio_mask	= 0x1f,	/* pio0-4 */
	.port_ops	= &sis_66_ops,
};
static struct ata_port_info sis_info133 = {
	.sht		= &sis_sht,
	.host_flags	= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
	.pio_mask	= 0x1f,	/* pio0-4 */
	.udma_mask	= ATA_UDMA6,
	.port_ops	= &sis_133_ops,
};
static struct ata_port_info sis_info133_early = {
	.sht		= &sis_sht,
	.host_flags	= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
	.pio_mask	= 0x1f,	/* pio0-4 */
	.udma_mask	= ATA_UDMA6,
	.port_ops	= &sis_133_early_ops,
};


static void sis_fixup(struct pci_dev *pdev, struct sis_chipset *sis)
{
	u16 regw;
	u8 reg;
	
	if (sis->info == &sis_info133) {
		pci_read_config_word(pdev, 0x50, &regw);
		if(regw & 0x08)
			pci_write_config_word(pdev, 0x50, regw & ~0x08);
		pci_read_config_word(pdev, 0x52, &regw);
		if(regw & 0x08)
			pci_write_config_word(pdev, 0x52, regw & ~0x08);
		return;
	}
	
	if (sis->info == &sis_info133_early || sis->info == &sis_info100) {
		/* Fix up latency */
		pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0x80);
		/* Set compatibility bit */
		pci_read_config_byte(pdev, 0x49, &reg);
		if (!(reg & 0x01))
			pci_write_config_byte(pdev, 0x49, reg | 0x01);
		return;
	}
	
	if (sis->info == &sis_info66 || sis->info == &sis_info100_early) {
		/* Fix up latency */
		pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0x80);
		/* Set compatibility bit */
		pci_read_config_byte(pdev, 0x52, &reg);
		if (!(reg & 0x04))
			pci_write_config_byte(pdev, 0x52, reg | 0x04);
		return;
	}
	
	if (sis->info == &sis_info33) {
		pci_read_config_byte(pdev, PCI_CLASS_PROG, &reg);
		if (( reg & 0x0F ) != 0x00)
			pci_write_config_byte(pdev, PCI_CLASS_PROG, reg & 0xF0);
		/* Fall through to ATA16 fixup below */
	}
	
	if (sis->info == &sis_info || sis->info == &sis_info33) {
		/* force per drive recovery and active timings
		   needed on ATA_33 and below chips */
		pci_read_config_byte(pdev, 0x52, &reg);
		if (!(reg & 0x08))
			pci_write_config_byte(pdev, 0x52, reg|0x08);
		return;
	}
	
	BUG();
}

/**
 *	sis_init_one - Register SiS ATA PCI device with kernel services
 *	@pdev: PCI device to register
 *	@ent: Entry in sis_pci_tbl matching with @pdev
 *
 *	Called from kernel PCI layer.  We probe for combined mode (sigh),
 *	and then hand over control to libata, for it to do the rest.
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 *
 *	RETURNS:
 *	Zero on success, or -ERRNO value.
 */

static int sis_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
{
	static int printed_version;
	static struct ata_port_info *port_info[2];
	struct ata_port_info *port;
	struct pci_dev *host;
	struct sis_chipset *chipset = NULL;
	
	static struct sis_chipset sis_chipsets[] = {
		{ 0x0745, &sis_info100 },
		{ 0x0735, &sis_info100 },
		{ 0x0733, &sis_info100 },
		{ 0x0635, &sis_info100 },
		{ 0x0633, &sis_info100 },
		
		{ 0x0730, &sis_info100_early },	/* 100 with ATA 66 layout */
		{ 0x0550, &sis_info100_early },	/* 100 with ATA 66 layout */
		
		{ 0x0640, &sis_info66 },
		{ 0x0630, &sis_info66 },
		{ 0x0620, &sis_info66 },
		{ 0x0540, &sis_info66 },
		{ 0x0530, &sis_info66 },
		
		{ 0x5600, &sis_info33 },
		{ 0x5598, &sis_info33 },
		{ 0x5597, &sis_info33 },
		{ 0x5591, &sis_info33 },
		{ 0x5582, &sis_info33 },
		{ 0x5581, &sis_info33 },
		
		{ 0x5596, &sis_info },
		{ 0x5571, &sis_info },
		{ 0x5517, &sis_info },
		{ 0x5511, &sis_info },
		
		{0}
	};
	static struct sis_chipset sis133_early = {
		0x0, &sis_info133_early
	};
	static struct sis_chipset sis133 = {
		0x0, &sis_info133
	};
	static struct sis_chipset sis100_early = {
		0x0, &sis_info100_early
	};
	static struct sis_chipset sis100 = {
		0x0, &sis_info100
	};
	
	if (!printed_version++)
		dev_printk(KERN_DEBUG, &pdev->dev,
			   "version " DRV_VERSION "\n");

/* We have to find the bridge first */

	
	for (chipset = &sis_chipsets[0]; chipset->device; chipset++) {
		host = pci_get_device(0x1039, chipset->device, NULL);
		if (host != NULL) {
			if (chipset->device == 0x630) {	/* SIS630 */
				u8 host_rev;
				pci_read_config_byte(host, PCI_REVISION_ID, &host_rev);
				if(host_rev >= 0x30)	/* 630 ET */
					chipset = &sis100_early;
			}
			break;
		}
	}
	
	/* Look for concealed bridges */
	if (host == NULL) {
		/* Second check */
		u32 idemisc;
		u16 trueid;
		
		/* Disable ID masking and register remapping then
		   see what the real ID is */
		
		pci_read_config_dword(pdev, 0x54, &idemisc);
		pci_write_config_dword(pdev, 0x54, idemisc & 0x7fffffff);
		pci_read_config_word(pdev, PCI_DEVICE_ID, &trueid);
		pci_write_config_dword(pdev, 0x54, idemisc);

		switch(trueid) {
		case 0x5518:	/* SIS 962/963 */
			chipset = &sis133;
			if ((idemisc & 0x40000000) == 0) {
				pci_write_config_dword(pdev, 0x54, idemisc | 0x40000000);
				printk(KERN_INFO "SIS5513: Switching to 5513 register mapping\n");
			}
			break;
		case 0x0180:	/* SIS 965L */
			chipset =  &sis133;
			break;
		}
	}

	/* Further check */	
	if(chipset == NULL) {
		struct pci_dev *lpc_bridge;
		u16 trueid;
		u8 prefctl;
		u8 idecfg;
		u8 sbrev;
		
		/* Try the second unmasking technique */
		pci_read_config_byte(pdev, 0x4a, &idecfg);
		pci_write_config_byte(pdev, 0x4a, idecfg | 0x10);
		pci_read_config_word(pdev, PCI_DEVICE_ID, &trueid);
		pci_write_config_byte(pdev, 0x4a, idecfg);
		
		switch(trueid) {
		case 0x5517:
			lpc_bridge = pci_get_slot(0x00, 0x10); /* Bus 0 Dev 2 Fn 0 */
			if(lpc_bridge == NULL)
				break;
			pci_read_config_byte(lpc_bridge, PCI_REVISION_ID, &sbrev);
			pci_read_config_byte(pdev, 0x49, &prefctl);
			pci_dev_put(lpc_bridge);
		
			if(sbrev == 0x10 && (prefctl & 0x80)) {
				chipset = &sis133_early;
				break;

}chipset = &sis100;

			break;
		}
	}		
	pci_dev_put(host);
	
	/* No chipset info, no support */
	if (chipset == NULL)
		return -ENODEV;
		
	port = chipset->info;
	port->private_data = chipset;

	sis_fixup(pdev, chipset);
		
	port_info[0] = port_info[1] = port;
	return ata_pci_init_one(pdev, port_info, 2);
}

static const struct pci_device_id sis_pci_tbl[] = {
	{ 0x1039, 0x5513, PCI_ANY_ID, PCI_ANY_ID, },
	{ 0x1039, 0x5518, PCI_ANY_ID, PCI_ANY_ID, },
	{ }	/* terminate list */
};

static struct pci_driver sis_pci_driver = {
	.name			= DRV_NAME,
	.id_table		= sis_pci_tbl,
	.probe			= sis_init_one,
	.remove			= ata_pci_remove_one,
};

static int __init sis_init(void)
{
	int rc;

	DPRINTK("pci_module_init\n");
	rc = pci_module_init(&sis_pci_driver);
	if (rc)
		return rc;

	DPRINTK("done\n");
	return 0;
}


Overblown (I know, its probably based on my own code).

Replace all that code with one line:

	return pci_register_driver(&sis_pci_driver);

Otherwise, driver looks fine.

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References:
- PATCH: Initial PATA driver for SiS chipset IDE
  - From: Alan Cox <[email protected]>

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