path: root/drivers/ata/pata_sis.c

/*
 *    pata_sis.c - SiS ATA driver
 *
 *	(C) 2005 Red Hat <alan@redhat.com>
 *
 *    Based upon linux/drivers/ide/pci/sis5513.c
 * Copyright (C) 1999-2000	Andre Hedrick <andre@linux-ide.org>
 * Copyright (C) 2002		Lionel Bouton <Lionel.Bouton@inet6.fr>, Maintainer
 * Copyright (C) 2003		Vojtech Pavlik <vojtech@suse.cz>
 * 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 <lcchang@sis.com.tw>
 *
 *
 *	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	"0.4.4"

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_port_base		-	return PCI configuration base for dev
 *	@adev: device
 *
 *	Returns the base of the PCI configuration registers for this port
 *	number.
 */

static int sis_port_base(struct ata_device *adev)
{
	return  0x40 + (4 * adev->ap->port_no) +  (2 * adev->devno);
}

/**
 *	sis_133_pre_reset	-	check for 40/80 pin
 *	@ap: Port
 *
 *	Perform cable detection for the later UDMA133 capable
 *	SiS chipset.
 */

static int sis_133_pre_reset(struct ata_port *ap)
{
	static const struct pci_bits sis_enable_bits[] = {
		{ 0x4aU, 1U, 0x02UL, 0x02UL },	/* port 0 */
		{ 0x4aU, 1U, 0x04UL, 0x04UL },	/* port 1 */
	};

	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	u16 tmp;

	if (!pci_test_config_bits(pdev, &sis_enable_bits[ap->port_no]))
		return -ENOENT;

	/* The top bit of this register is the cable detect bit */
	pci_read_config_word(pdev, 0x50 + 2 * ap->port_no, &tmp);
	if (tmp & 0x8000)
		ap->cbl = ATA_CBL_PATA40;
	else
		ap->cbl = ATA_CBL_PATA80;

	return ata_std_prereset(ap);
}

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

static void sis_133_error_handler(struct ata_port *ap)
{
	ata_bmdma_drive_eh(ap, sis_133_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
}


/**
 *	sis_66_pre_reset	-	check for 40/80 pin
 *	@ap: Port
 *
 *	Perform cable detection on the UDMA66, UDMA100 and early UDMA133
 *	SiS IDE controllers.
 */

static int sis_66_pre_reset(struct ata_port *ap)
{
	static const struct pci_bits sis_enable_bits[] = {
		{ 0x4aU, 1U, 0x02UL, 0x02UL },	/* port 0 */
		{ 0x4aU, 1U, 0x04UL, 0x04UL },	/* port 1 */
	};

	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	u8 tmp;

	if (!pci_test_config_bits(pdev, &sis_enable_bits[ap->port_no])) {
		ata_port_disable(ap);
		printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
		return 0;
	}
	/* Older chips keep cable detect in bits 4/5 of reg 0x48 */
	pci_read_config_byte(pdev, 0x48, &tmp);
	tmp >>= ap->port_no;
	if (tmp & 0x10)
		ap->cbl = ATA_CBL_PATA40;
	else
		ap->cbl = ATA_CBL_PATA80;

	return ata_std_prereset(ap);
}

/**
 *	sis_66_error_handler - Probe specified port on PATA host controller
 *	@ap: Port to probe
 *	@classes:
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static void sis_66_error_handler(struct ata_port *ap)
{
	ata_bmdma_drive_eh(ap, sis_66_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
}

/**
 *	sis_old_pre_reset		-	probe begin
 *	@ap: ATA port
 *
 *	Set up cable type and use generic probe init
 */

static int sis_old_pre_reset(struct ata_port *ap)
{
	static const struct pci_bits sis_enable_bits[] = {
		{ 0x4aU, 1U, 0x02UL, 0x02UL },	/* port 0 */
		{ 0x4aU, 1U, 0x04UL, 0x04UL },	/* port 1 */
	};

	struct pci_dev *pdev = to_pci_dev(ap->host->dev);

	if (!pci_test_config_bits(pdev, &sis_enable_bits[ap->port_no])) {
		ata_port_disable(ap);
		printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
		return 0;
	}
	ap->cbl = ATA_CBL_PATA40;
	return ata_std_prereset(ap);
}


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

static void sis_old_error_handler(struct</