path: root/drivers/ata/pata_sis.c

/*
 *    pata_sis.c - SiS ATA driver
 *
 *	(C) 2005 Red Hat <alan@redhat.com>
 *	(C) 2007 Bartlomiej Zolnierkiewicz
 *
 *    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>
#include "sis.h"

#define DRV_NAME	"pata_sis"
#define DRV_VERSION	"0.5.2"

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

struct sis_laptop {
	u16 device;
	u16 subvendor;
	u16 subdevice;
};

static const struct sis_laptop sis_laptop[] = {
	/* devid, subvendor, subdev */
	{ 0x5513, 0x1043, 0x1107 },	/* ASUS A6K */
	{ 0x5513, 0x1734, 0x105F },	/* FSC Amilo A1630 */
	{ 0x5513, 0x1071, 0x8640 },     /* EasyNote K5305 */
	/* end marker */
	{ 0, }
};

static int sis_short_ata40(struct pci_dev *dev)
{
	const struct sis_laptop *lap = &sis_laptop[0];

	while (lap->device) {
		if (lap->device == dev->device &&
		    lap->subvendor == dev->subsystem_vendor &&
		    lap->subdevice == dev->subsystem_device)
			return 1;
		lap++;
	}

	return 0;
}

/**
 *	sis_old_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_old_port_base(struct ata_device *adev)
{
	return  0x40 + (4 * adev->link->ap->port_no) +  (2 * adev->devno);
}

/**
 *	sis_133_cable_detect	-	check for 40/80 pin
 *	@ap: Port
 *	@deadline: deadline jiffies for the operation
 *
 *	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->dev);
	u16 tmp;

	/* 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) && !sis_short_ata40(pdev))
		return ATA_CBL_PATA40;
	return ATA_CBL_PATA80;
}

/**
 *	sis_66_cable_detect	-	check for 40/80 pin
 *	@ap: Port
 *	@deadline: deadline jiffies for the operation
 *
 *	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->dev);
	u8 tmp;

	/* 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) && !sis_short_ata40(pdev))
		return ATA_CBL_PATA40;
	return ATA_CBL_PATA80;
}


/**
 *	sis_pre_reset		-	probe begin
 *	@link: ATA link
 *	@deadline: deadline jiffies for the operation
 *
 *	Set up cable type and use generic probe init
 */

static int sis_pre_reset(struct ata_link *link, unsigned long deadline)
{
	static const struct pci_bits sis_enable_bits[] = {
		{ 0x4aU, 1U, 0x02UL, 0x02UL },	/* port 0 */
		{ 0x4aU, 1U, 0x04UL, 0x04UL },	/* port 1 */
	};

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

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

	/* Clear the FIFO settings. We can't enable the FIFO until
	   we know we are poking at a disk */
	pci_write_config_byte(pdev, 0x4B, 0);
	return ata_std_prereset(link, deadline);
}


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

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

/**
 *	sis_set_fifo	-	Set RWP fifo bits for this device
 *	@ap: Port
 *	@adev: Device
 *
 *	SIS chipsets implement prefetch/postwrite bits for each device