drivers/ata/pata_serverworks.c - kernel/common - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * pata_serverworks.c 	- Serverworks PATA for new ATA layer
  *			  (C) 2005 Red Hat Inc
  *			  (C) 2010 Bartlomiej Zolnierkiewicz
  *
  * based upon
  *
  * serverworks.c
  *
  * Copyright (C) 1998-2000 Michel Aubry
  * Copyright (C) 1998-2000 Andrzej Krzysztofowicz
  * Copyright (C) 1998-2000 Andre Hedrick <[email protected]>
  * Portions copyright (c) 2001 Sun Microsystems
  *
  *
  * RCC/ServerWorks IDE driver for Linux
  *
  *   OSB4: `Open South Bridge' IDE Interface (fn 1)
  *         supports UDMA mode 2 (33 MB/s)
  *
  *   CSB5: `Champion South Bridge' IDE Interface (fn 1)
  *         all revisions support UDMA mode 4 (66 MB/s)
  *         revision A2.0 and up support UDMA mode 5 (100 MB/s)
  *
  *         *** The CSB5 does not provide ANY register ***
  *         *** to detect 80-conductor cable presence. ***
  *
  *   CSB6: `Champion South Bridge' IDE Interface (optional: third channel)
  *
  * Documentation:
  *	Available under NDA only. Errata info very hard to get.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/blkdev.h>
 #include <linux/delay.h>
 #include <scsi/scsi_host.h>
 #include <linux/libata.h>

 #define DRV_NAME "pata_serverworks"
 #define DRV_VERSION "0.4.3"

 #define SVWKS_CSB5_REVISION_NEW	0x92 /* min PCI_REVISION_ID for UDMA5 (A2.0) */
 #define SVWKS_CSB6_REVISION	0xa0 /* min PCI_REVISION_ID for UDMA4 (A1.0) */

 /* Seagate Barracuda ATA IV Family drives in UDMA mode 5
  * can overrun their FIFOs when used with the CSB5 */

 static const char *csb_bad_ata100[] = {
 	"ST320011A",
 	"ST340016A",
 	"ST360021A",
 	"ST380021A",
 	NULL
 };

 /**
  *	oem_cable	-	Dell/Sun serverworks cable detection
  *	@ap: ATA port to do cable detect
  *
  *	Dell PowerEdge and Sun Cobalt 'Alpine' hide the 40/80 pin select
  *	for their interfaces in the top two bits of the subsystem ID.
  */

 static int oem_cable(struct ata_port *ap)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);

 	if (pdev->subsystem_device & (1 << (ap->port_no + 14)))
 		return ATA_CBL_PATA80;
 	return ATA_CBL_PATA40;
 }

 struct sv_cable_table {
 	int device;
 	int subvendor;
 	int (*cable_detect)(struct ata_port *ap);
 };

 static struct sv_cable_table cable_detect[] = {
 	{ PCI_DEVICE_ID_SERVERWORKS_CSB5IDE,   PCI_VENDOR_ID_DELL, oem_cable },
 	{ PCI_DEVICE_ID_SERVERWORKS_CSB6IDE,   PCI_VENDOR_ID_DELL, oem_cable },
 	{ PCI_DEVICE_ID_SERVERWORKS_CSB5IDE,   PCI_VENDOR_ID_SUN,  oem_cable },
 	{ PCI_DEVICE_ID_SERVERWORKS_OSB4IDE,   PCI_ANY_ID, ata_cable_40wire  },
 	{ PCI_DEVICE_ID_SERVERWORKS_CSB5IDE,   PCI_ANY_ID, ata_cable_unknown },
 	{ PCI_DEVICE_ID_SERVERWORKS_CSB6IDE,   PCI_ANY_ID, ata_cable_unknown },
 	{ PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2,  PCI_ANY_ID, ata_cable_unknown },
 	{ PCI_DEVICE_ID_SERVERWORKS_HT1000IDE, PCI_ANY_ID, ata_cable_unknown },
 	{ }
 };

 /**
  *	serverworks_cable_detect	-	cable detection
  *	@ap: ATA port
  *
  *	Perform cable detection according to the device and subvendor
  *	identifications
  */

 static int serverworks_cable_detect(struct ata_port *ap)
 {
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	struct sv_cable_table *cb = cable_detect;

 	while(cb->device) {
 		if (cb->device == pdev->device &&
 		    (cb->subvendor == pdev->subsystem_vendor ||
 		      cb->subvendor == PCI_ANY_ID)) {
 			return cb->cable_detect(ap);
 		}
 		cb++;
 	}

 	BUG();
 	return -1;	/* kill compiler warning */
 }

 /**
  *	serverworks_is_csb	-	Check for CSB or OSB
  *	@pdev: PCI device to check
  *
  *	Returns true if the device being checked is known to be a CSB
  *	series device.
  */

 static u8 serverworks_is_csb(struct pci_dev *pdev)
 {
 	switch (pdev->device) {
 		case PCI_DEVICE_ID_SERVERWORKS_CSB5IDE:
 		case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE:
 		case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2:
 		case PCI_DEVICE_ID_SERVERWORKS_HT1000IDE:
 			return 1;
 		default:
 			break;
 	}
 	return 0;
 }

 /**
  *	serverworks_osb4_filter	-	mode selection filter
  *	@adev: ATA device
  *	@mask: Mask of proposed modes
  *
  *	Filter the offered modes for the device to apply controller
  *	specific rules. OSB4 requires no UDMA for disks due to a FIFO
  *	bug we hit.
  */

 static unsigned long serverworks_osb4_filter(struct ata_device *adev, unsigned long mask)
 {
 	if (adev->class == ATA_DEV_ATA)
 		mask &= ~ATA_MASK_UDMA;
 	return mask;
 }


 /**
  *	serverworks_csb_filter	-	mode selection filter
  *	@adev: ATA device
  *	@mask: Mask of proposed modes
  *
  *	Check the blacklist and disable UDMA5 if matched
  */

 static unsigned long serverworks_csb_filter(struct ata_device *adev, unsigned long mask)
 {
 	const char *p;
 	char model_num[ATA_ID_PROD_LEN + 1];
 	int i;

 	/* Disk, UDMA */
 	if (adev->class != ATA_DEV_ATA)
 		return mask;

 	/* Actually do need to check */
 	ata_id_c_string(adev->id, model_num, ATA_ID_PROD, sizeof(model_num));

 	for (i = 0; (p = csb_bad_ata100[i]) != NULL; i++) {
 		if (!strcmp(p, model_num))
 			mask &= ~(0xE0 << ATA_SHIFT_UDMA);
 	}
 	return mask;
 }

 /**
  *	serverworks_set_piomode	-	set initial PIO mode data
  *	@ap: ATA interface
  *	@adev: ATA device
  *
  *	Program the OSB4/CSB5 timing registers for PIO. The PIO register
  *	load is done as a simple lookup.
  */
 static void serverworks_set_piomode(struct ata_port *ap, struct ata_device *adev)
 {
 	static const u8 pio_mode[] = { 0x5d, 0x47, 0x34, 0x22, 0x20 };
 	int offset = 1 + 2 * ap->port_no - adev->devno;
 	int devbits = (2 * ap->port_no + adev->devno) * 4;
 	u16 csb5_pio;
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	int pio = adev->pio_mode - XFER_PIO_0;

 	pci_write_config_byte(pdev, 0x40 + offset, pio_mode[pio]);

 	/* The OSB4 just requires the timing but the CSB series want the
 	   mode number as well */
 	if (serverworks_is_csb(pdev)) {
 		pci_read_config_word(pdev, 0x4A, &csb5_pio);
 		csb5_pio &= ~(0x0F << devbits);
 		pci_write_config_word(pdev, 0x4A, csb5_pio | (pio << devbits));
 	}
 }

 /**
  *	serverworks_set_dmamode	-	set initial DMA mode data
  *	@ap: ATA interface
  *	@adev: ATA device
  *
  *	Program the MWDMA/UDMA modes for the serverworks OSB4/CSB5
  *	chipset. The MWDMA mode values are pulled from a lookup table
  *	while the chipset uses mode number for UDMA.
  */

 static void serverworks_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 {
 	static const u8 dma_mode[] = { 0x77, 0x21, 0x20 };
 	int offset = 1 + 2 * ap->port_no - adev->devno;
 	int devbits = 2 * ap->port_no + adev->devno;
 	u8 ultra;
 	u8 ultra_cfg;
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);

 	pci_read_config_byte(pdev, 0x54, &ultra_cfg);
 	pci_read_config_byte(pdev, 0x56 + ap->port_no, &ultra);
 	ultra &= ~(0x0F << (adev->devno * 4));

 	if (adev->dma_mode >= XFER_UDMA_0) {
 		pci_write_config_byte(pdev, 0x44 + offset,  0x20);

 		ultra |= (adev->dma_mode - XFER_UDMA_0)
 					<< (adev->devno * 4);
 		ultra_cfg |=  (1 << devbits);
 	} else {
 		pci_write_config_byte(pdev, 0x44 + offset,
 			dma_mode[adev->dma_mode - XFER_MW_DMA_0]);
 		ultra_cfg &= ~(1 << devbits);
 	}
 	pci_write_config_byte(pdev, 0x56 + ap->port_no, ultra);
 	pci_write_config_byte(pdev, 0x54, ultra_cfg);
 }

 static struct scsi_host_template serverworks_osb4_sht = {
 	ATA_BMDMA_SHT(DRV_NAME),
 	.sg_tablesize	= LIBATA_DUMB_MAX_PRD,
 };

 static struct scsi_host_template serverworks_csb_sht = {
 	ATA_BMDMA_SHT(DRV_NAME),
 };

 static struct ata_port_operations serverworks_osb4_port_ops = {
 	.inherits	= &ata_bmdma_port_ops,
 	.qc_prep	= ata_bmdma_dumb_qc_prep,
 	.cable_detect	= serverworks_cable_detect,
 	.mode_filter	= serverworks_osb4_filter,
 	.set_piomode	= serverworks_set_piomode,
 	.set_dmamode	= serverworks_set_dmamode,
 };

 static struct ata_port_operations serverworks_csb_port_ops = {
 	.inherits	= &serverworks_osb4_port_ops,
 	.qc_prep	= ata_bmdma_qc_prep,
 	.mode_filter	= serverworks_csb_filter,
 };

 static int serverworks_fixup_osb4(struct pci_dev *pdev)
 {
 	u32 reg;
 	struct pci_dev *isa_dev = pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
 		  PCI_DEVICE_ID_SERVERWORKS_OSB4, NULL);
 	if (isa_dev) {
 		pci_read_config_dword(isa_dev, 0x64, &reg);
 		reg &= ~0x00002000; /* disable 600ns interrupt mask */
 		if (!(reg & 0x00004000))
 			printk(KERN_DEBUG DRV_NAME ": UDMA not BIOS enabled.\n");
 		reg |=  0x00004000; /* enable UDMA/33 support */
 		pci_write_config_dword(isa_dev, 0x64, reg);
 		pci_dev_put(isa_dev);
 		return 0;
 	}
 	printk(KERN_WARNING DRV_NAME ": Unable to find bridge.\n");
 	return -ENODEV;
 }

 static int serverworks_fixup_csb(struct pci_dev *pdev)
 {
 	u8 btr;

 	/* Third Channel Test */
 	if (!(PCI_FUNC(pdev->devfn) & 1)) {
 		struct pci_dev * findev = NULL;
 		u32 reg4c = 0;
 		findev = pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
 			PCI_DEVICE_ID_SERVERWORKS_CSB5, NULL);
 		if (findev) {
 			pci_read_config_dword(findev, 0x4C, &reg4c);
 			reg4c &= ~0x000007FF;
 			reg4c |=  0x00000040;
 			reg4c |=  0x00000020;
 			pci_write_config_dword(findev, 0x4C, reg4c);
 			pci_dev_put(findev);
 		}
 	} else {
 		struct pci_dev * findev = NULL;
 		u8 reg41 = 0;

 		findev = pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
 				PCI_DEVICE_ID_SERVERWORKS_CSB6, NULL);
 		if (findev) {
 			pci_read_config_byte(findev, 0x41, &reg41);
 			reg41 &= ~0x40;
 			pci_write_config_byte(findev, 0x41, reg41);
 			pci_dev_put(findev);
 		}
 	}
 	/* setup the UDMA Control register
 	 *
 	 * 1. clear bit 6 to enable DMA
 	 * 2. enable DMA modes with bits 0-1
 	 * 	00 : legacy
 	 * 	01 : udma2
 	 * 	10 : udma2/udma4
 	 * 	11 : udma2/udma4/udma5
 	 */
 	pci_read_config_byte(pdev, 0x5A, &btr);
 	btr &= ~0x40;
 	if (!(PCI_FUNC(pdev->devfn) & 1))
 		btr |= 0x2;
 	else
 		btr |= (pdev->revision >= SVWKS_CSB5_REVISION_NEW) ? 0x3 : 0x2;
 	pci_write_config_byte(pdev, 0x5A, btr);

 	return btr;
 }

 static void serverworks_fixup_ht1000(struct pci_dev *pdev)
 {
 	u8 btr;
 	/* Setup HT1000 SouthBridge Controller - Single Channel Only */
 	pci_read_config_byte(pdev, 0x5A, &btr);
 	btr &= ~0x40;
 	btr |= 0x3;
 	pci_write_config_byte(pdev, 0x5A, btr);
 }

 static int serverworks_fixup(struct pci_dev *pdev)
 {
 	int rc = 0;

 	/* Force master latency timer to 64 PCI clocks */
 	pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0x40);

 	switch (pdev->device) {
 	case PCI_DEVICE_ID_SERVERWORKS_OSB4IDE:
 		rc = serverworks_fixup_osb4(pdev);
 		break;
 	case PCI_DEVICE_ID_SERVERWORKS_CSB5IDE:
 		ata_pci_bmdma_clear_simplex(pdev);
 		/* fall through */
 	case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE:
 	case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2:
 		rc = serverworks_fixup_csb(pdev);
 		break;
 	case PCI_DEVICE_ID_SERVERWORKS_HT1000IDE:
 		serverworks_fixup_ht1000(pdev);
 		break;
 	}

 	return rc;
 }

 static int serverworks_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	static const struct ata_port_info info[4] = {
 		{ /* OSB4 */
 			.flags = ATA_FLAG_SLAVE_POSS,
 			.pio_mask = ATA_PIO4,
 			.mwdma_mask = ATA_MWDMA2,
 			.udma_mask = ATA_UDMA2,
 			.port_ops = &serverworks_osb4_port_ops
 		}, { /* OSB4 no UDMA */
 			.flags = ATA_FLAG_SLAVE_POSS,
 			.pio_mask = ATA_PIO4,
 			.mwdma_mask = ATA_MWDMA2,
 			/* No UDMA */
 			.port_ops = &serverworks_osb4_port_ops
 		}, { /* CSB5 */
 			.flags = ATA_FLAG_SLAVE_POSS,
 			.pio_mask = ATA_PIO4,
 			.mwdma_mask = ATA_MWDMA2,
 			.udma_mask = ATA_UDMA4,
 			.port_ops = &serverworks_csb_port_ops
 		}, { /* CSB5 - later revisions*/
 			.flags = ATA_FLAG_SLAVE_POSS,
 			.pio_mask = ATA_PIO4,
 			.mwdma_mask = ATA_MWDMA2,
 			.udma_mask = ATA_UDMA5,
 			.port_ops = &serverworks_csb_port_ops
 		}
 	};
 	const struct ata_port_info *ppi[] = { &info[id->driver_data], NULL };
 	struct scsi_host_template *sht = &serverworks_csb_sht;
 	int rc;

 	rc = pcim_enable_device(pdev);
 	if (rc)
 		return rc;

 	rc = serverworks_fixup(pdev);

 	/* OSB4 : South Bridge and IDE */
 	if (pdev->device == PCI_DEVICE_ID_SERVERWORKS_OSB4IDE) {
 		/* Select non UDMA capable OSB4 if we can't do fixups */
 		if (rc < 0)
 			ppi[0] = &info[1];
 		sht = &serverworks_osb4_sht;
 	}
 	/* setup CSB5/CSB6 : South Bridge and IDE option RAID */
 	else if ((pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5IDE) ||
 		 (pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE) ||
 		 (pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2)) {

 		 /* If the returned btr is the newer revision then
 		    select the right info block */
 		 if (rc == 3)
 		 	ppi[0] = &info[3];

 		/* Is this the 3rd channel CSB6 IDE ? */
 		if (pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2)
 			ppi[1] = &ata_dummy_port_info;
 	}

 	return ata_pci_bmdma_init_one(pdev, ppi, sht, NULL, 0);
 }

 #ifdef CONFIG_PM_SLEEP
 static int serverworks_reinit_one(struct pci_dev *pdev)
 {
 	struct ata_host *host = pci_get_drvdata(pdev);
 	int rc;

 	rc = ata_pci_device_do_resume(pdev);
 	if (rc)
 		return rc;

 	(void)serverworks_fixup(pdev);

 	ata_host_resume(host);
 	return 0;
 }
 #endif

 static const struct pci_device_id serverworks[] = {
 	{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_OSB4IDE), 0},
 	{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB5IDE), 2},
 	{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6IDE), 2},
 	{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2), 2},
 	{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_HT1000IDE), 2},

 	{ },
 };

 static struct pci_driver serverworks_pci_driver = {
 	.name 		= DRV_NAME,
 	.id_table	= serverworks,
 	.probe 		= serverworks_init_one,
 	.remove		= ata_pci_remove_one,
 #ifdef CONFIG_PM_SLEEP
 	.suspend	= ata_pci_device_suspend,
 	.resume		= serverworks_reinit_one,
 #endif
 };

 module_pci_driver(serverworks_pci_driver);

 MODULE_AUTHOR("Alan Cox");
 MODULE_DESCRIPTION("low-level driver for Serverworks OSB4/CSB5/CSB6");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, serverworks);
 MODULE_VERSION(DRV_VERSION);
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* pata_serverworks.c - Serverworks PATA for new ATA layer
	* (C) 2005 Red Hat Inc
	* (C) 2010 Bartlomiej Zolnierkiewicz
	*
	* based upon
	*
	* serverworks.c
	*
	* Copyright (C) 1998-2000 Michel Aubry
	* Copyright (C) 1998-2000 Andrzej Krzysztofowicz
	* Copyright (C) 1998-2000 Andre Hedrick <[email protected]>
	* Portions copyright (c) 2001 Sun Microsystems
	*
	*
	* RCC/ServerWorks IDE driver for Linux
	*
	* OSB4: `Open South Bridge' IDE Interface (fn 1)
	* supports UDMA mode 2 (33 MB/s)
	*
	* CSB5: `Champion South Bridge' IDE Interface (fn 1)
	* all revisions support UDMA mode 4 (66 MB/s)
	* revision A2.0 and up support UDMA mode 5 (100 MB/s)
	*
	* * The CSB5 does not provide ANY register *
	* * to detect 80-conductor cable presence. *
	*
	* CSB6: `Champion South Bridge' IDE Interface (optional: third channel)
	*
	* Documentation:
	* Available under NDA only. Errata info very hard to get.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/pci.h>
	#include <linux/blkdev.h>
	#include <linux/delay.h>
	#include <scsi/scsi_host.h>
	#include <linux/libata.h>

	#define DRV_NAME "pata_serverworks"
	#define DRV_VERSION "0.4.3"

	#define SVWKS_CSB5_REVISION_NEW 0x92 /* min PCI_REVISION_ID for UDMA5 (A2.0) */
	#define SVWKS_CSB6_REVISION 0xa0 /* min PCI_REVISION_ID for UDMA4 (A1.0) */

	/* Seagate Barracuda ATA IV Family drives in UDMA mode 5
	* can overrun their FIFOs when used with the CSB5 */

	static const char *csb_bad_ata100[] = {
	"ST320011A",
	"ST340016A",
	"ST360021A",
	"ST380021A",
	NULL
	};

	/**
	* oem_cable - Dell/Sun serverworks cable detection
	* @ap: ATA port to do cable detect
	*
	* Dell PowerEdge and Sun Cobalt 'Alpine' hide the 40/80 pin select
	* for their interfaces in the top two bits of the subsystem ID.
	*/

	static int oem_cable(struct ata_port *ap)
	{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);

	if (pdev->subsystem_device & (1 << (ap->port_no + 14)))
	return ATA_CBL_PATA80;
	return ATA_CBL_PATA40;
	}

	struct sv_cable_table {
	int device;
	int subvendor;
	int (cable_detect)(struct ata_port ap);
	};

	static struct sv_cable_table cable_detect[] = {
	{ PCI_DEVICE_ID_SERVERWORKS_CSB5IDE, PCI_VENDOR_ID_DELL, oem_cable },
	{ PCI_DEVICE_ID_SERVERWORKS_CSB6IDE, PCI_VENDOR_ID_DELL, oem_cable },
	{ PCI_DEVICE_ID_SERVERWORKS_CSB5IDE, PCI_VENDOR_ID_SUN, oem_cable },
	{ PCI_DEVICE_ID_SERVERWORKS_OSB4IDE, PCI_ANY_ID, ata_cable_40wire },
	{ PCI_DEVICE_ID_SERVERWORKS_CSB5IDE, PCI_ANY_ID, ata_cable_unknown },
	{ PCI_DEVICE_ID_SERVERWORKS_CSB6IDE, PCI_ANY_ID, ata_cable_unknown },
	{ PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2, PCI_ANY_ID, ata_cable_unknown },
	{ PCI_DEVICE_ID_SERVERWORKS_HT1000IDE, PCI_ANY_ID, ata_cable_unknown },
	{ }
	};

	/**
	* serverworks_cable_detect - cable detection
	* @ap: ATA port
	*
	* Perform cable detection according to the device and subvendor
	* identifications
	*/

	static int serverworks_cable_detect(struct ata_port *ap)
	{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	struct sv_cable_table *cb = cable_detect;

	while(cb->device) {
	if (cb->device == pdev->device &&
	(cb->subvendor == pdev->subsystem_vendor \|\|
	cb->subvendor == PCI_ANY_ID)) {
	return cb->cable_detect(ap);
	}
	cb++;
	}

	BUG();
	return -1; /* kill compiler warning */
	}

	/**
	* serverworks_is_csb - Check for CSB or OSB
	* @pdev: PCI device to check
	*
	* Returns true if the device being checked is known to be a CSB
	* series device.
	*/

	static u8 serverworks_is_csb(struct pci_dev *pdev)
	{
	switch (pdev->device) {
	case PCI_DEVICE_ID_SERVERWORKS_CSB5IDE:
	case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE:
	case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2:
	case PCI_DEVICE_ID_SERVERWORKS_HT1000IDE:
	return 1;
	default:
	break;
	}
	return 0;
	}

	/**
	* serverworks_osb4_filter - mode selection filter
	* @adev: ATA device
	* @mask: Mask of proposed modes
	*
	* Filter the offered modes for the device to apply controller
	* specific rules. OSB4 requires no UDMA for disks due to a FIFO
	* bug we hit.
	*/

	static unsigned long serverworks_osb4_filter(struct ata_device *adev, unsigned long mask)
	{
	if (adev->class == ATA_DEV_ATA)
	mask &= ~ATA_MASK_UDMA;
	return mask;
	}


	/**
	* serverworks_csb_filter - mode selection filter
	* @adev: ATA device
	* @mask: Mask of proposed modes
	*
	* Check the blacklist and disable UDMA5 if matched
	*/

	static unsigned long serverworks_csb_filter(struct ata_device *adev, unsigned long mask)
	{
	const char *p;
	char model_num[ATA_ID_PROD_LEN + 1];
	int i;

	/* Disk, UDMA */
	if (adev->class != ATA_DEV_ATA)
	return mask;

	/* Actually do need to check */
	ata_id_c_string(adev->id, model_num, ATA_ID_PROD, sizeof(model_num));

	for (i = 0; (p = csb_bad_ata100[i]) != NULL; i++) {
	if (!strcmp(p, model_num))
	mask &= ~(0xE0 << ATA_SHIFT_UDMA);
	}
	return mask;
	}

	/**
	* serverworks_set_piomode - set initial PIO mode data
	* @ap: ATA interface
	* @adev: ATA device
	*
	* Program the OSB4/CSB5 timing registers for PIO. The PIO register
	* load is done as a simple lookup.
	*/
	static void serverworks_set_piomode(struct ata_port ap, struct ata_device adev)
	{
	static const u8 pio_mode[] = { 0x5d, 0x47, 0x34, 0x22, 0x20 };
	int offset = 1 + 2 * ap->port_no - adev->devno;
	int devbits = (2 * ap->port_no + adev->devno) * 4;
	u16 csb5_pio;
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	int pio = adev->pio_mode - XFER_PIO_0;

	pci_write_config_byte(pdev, 0x40 + offset, pio_mode[pio]);

	/* The OSB4 just requires the timing but the CSB series want the
	mode number as well */
	if (serverworks_is_csb(pdev)) {
	pci_read_config_word(pdev, 0x4A, &csb5_pio);
	csb5_pio &= ~(0x0F << devbits);
	pci_write_config_word(pdev, 0x4A, csb5_pio \| (pio << devbits));
	}
	}

	/**
	* serverworks_set_dmamode - set initial DMA mode data
	* @ap: ATA interface
	* @adev: ATA device
	*
	* Program the MWDMA/UDMA modes for the serverworks OSB4/CSB5
	* chipset. The MWDMA mode values are pulled from a lookup table
	* while the chipset uses mode number for UDMA.
	*/

	static void serverworks_set_dmamode(struct ata_port ap, struct ata_device adev)
	{
	static const u8 dma_mode[] = { 0x77, 0x21, 0x20 };
	int offset = 1 + 2 * ap->port_no - adev->devno;
	int devbits = 2 * ap->port_no + adev->devno;
	u8 ultra;
	u8 ultra_cfg;
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);

	pci_read_config_byte(pdev, 0x54, &ultra_cfg);
	pci_read_config_byte(pdev, 0x56 + ap->port_no, &ultra);
	ultra &= ~(0x0F << (adev->devno * 4));

	if (adev->dma_mode >= XFER_UDMA_0) {
	pci_write_config_byte(pdev, 0x44 + offset, 0x20);

	ultra \|= (adev->dma_mode - XFER_UDMA_0)
	<< (adev->devno * 4);
	ultra_cfg \|= (1 << devbits);
	} else {
	pci_write_config_byte(pdev, 0x44 + offset,
	dma_mode[adev->dma_mode - XFER_MW_DMA_0]);
	ultra_cfg &= ~(1 << devbits);
	}
	pci_write_config_byte(pdev, 0x56 + ap->port_no, ultra);
	pci_write_config_byte(pdev, 0x54, ultra_cfg);
	}

	static struct scsi_host_template serverworks_osb4_sht = {
	ATA_BMDMA_SHT(DRV_NAME),
	.sg_tablesize = LIBATA_DUMB_MAX_PRD,
	};

	static struct scsi_host_template serverworks_csb_sht = {
	ATA_BMDMA_SHT(DRV_NAME),
	};

	static struct ata_port_operations serverworks_osb4_port_ops = {
	.inherits = &ata_bmdma_port_ops,
	.qc_prep = ata_bmdma_dumb_qc_prep,
	.cable_detect = serverworks_cable_detect,
	.mode_filter = serverworks_osb4_filter,
	.set_piomode = serverworks_set_piomode,
	.set_dmamode = serverworks_set_dmamode,
	};

	static struct ata_port_operations serverworks_csb_port_ops = {
	.inherits = &serverworks_osb4_port_ops,
	.qc_prep = ata_bmdma_qc_prep,
	.mode_filter = serverworks_csb_filter,
	};

	static int serverworks_fixup_osb4(struct pci_dev *pdev)
	{
	u32 reg;
	struct pci_dev *isa_dev = pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
	PCI_DEVICE_ID_SERVERWORKS_OSB4, NULL);
	if (isa_dev) {
	pci_read_config_dword(isa_dev, 0x64, &reg);
	reg &= ~0x00002000; /* disable 600ns interrupt mask */
	if (!(reg & 0x00004000))
	printk(KERN_DEBUG DRV_NAME ": UDMA not BIOS enabled.\n");
	reg \|= 0x00004000; /* enable UDMA/33 support */
	pci_write_config_dword(isa_dev, 0x64, reg);
	pci_dev_put(isa_dev);
	return 0;
	}
	printk(KERN_WARNING DRV_NAME ": Unable to find bridge.\n");
	return -ENODEV;
	}

	static int serverworks_fixup_csb(struct pci_dev *pdev)
	{
	u8 btr;

	/* Third Channel Test */
	if (!(PCI_FUNC(pdev->devfn) & 1)) {
	struct pci_dev * findev = NULL;
	u32 reg4c = 0;
	findev = pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
	PCI_DEVICE_ID_SERVERWORKS_CSB5, NULL);
	if (findev) {
	pci_read_config_dword(findev, 0x4C, &reg4c);
	reg4c &= ~0x000007FF;
	reg4c \|= 0x00000040;
	reg4c \|= 0x00000020;
	pci_write_config_dword(findev, 0x4C, reg4c);
	pci_dev_put(findev);
	}
	} else {
	struct pci_dev * findev = NULL;
	u8 reg41 = 0;

	findev = pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
	PCI_DEVICE_ID_SERVERWORKS_CSB6, NULL);
	if (findev) {
	pci_read_config_byte(findev, 0x41, &reg41);
	reg41 &= ~0x40;
	pci_write_config_byte(findev, 0x41, reg41);
	pci_dev_put(findev);
	}
	}
	/* setup the UDMA Control register
	*
	* 1. clear bit 6 to enable DMA
	* 2. enable DMA modes with bits 0-1
	* 00 : legacy
	* 01 : udma2
	* 10 : udma2/udma4
	* 11 : udma2/udma4/udma5
	*/
	pci_read_config_byte(pdev, 0x5A, &btr);
	btr &= ~0x40;
	if (!(PCI_FUNC(pdev->devfn) & 1))
	btr \|= 0x2;
	else
	btr \|= (pdev->revision >= SVWKS_CSB5_REVISION_NEW) ? 0x3 : 0x2;
	pci_write_config_byte(pdev, 0x5A, btr);

	return btr;
	}

	static void serverworks_fixup_ht1000(struct pci_dev *pdev)
	{
	u8 btr;
	/* Setup HT1000 SouthBridge Controller - Single Channel Only */
	pci_read_config_byte(pdev, 0x5A, &btr);
	btr &= ~0x40;
	btr \|= 0x3;
	pci_write_config_byte(pdev, 0x5A, btr);
	}

	static int serverworks_fixup(struct pci_dev *pdev)
	{
	int rc = 0;

	/* Force master latency timer to 64 PCI clocks */
	pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0x40);

	switch (pdev->device) {
	case PCI_DEVICE_ID_SERVERWORKS_OSB4IDE:
	rc = serverworks_fixup_osb4(pdev);
	break;
	case PCI_DEVICE_ID_SERVERWORKS_CSB5IDE:
	ata_pci_bmdma_clear_simplex(pdev);
	/* fall through */
	case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE:
	case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2:
	rc = serverworks_fixup_csb(pdev);
	break;
	case PCI_DEVICE_ID_SERVERWORKS_HT1000IDE:
	serverworks_fixup_ht1000(pdev);
	break;
	}

	return rc;
	}

	static int serverworks_init_one(struct pci_dev pdev, const struct pci_device_id id)
	{
	static const struct ata_port_info info[4] = {
	{ /* OSB4 */
	.flags = ATA_FLAG_SLAVE_POSS,
	.pio_mask = ATA_PIO4,
	.mwdma_mask = ATA_MWDMA2,
	.udma_mask = ATA_UDMA2,
	.port_ops = &serverworks_osb4_port_ops
	}, { /* OSB4 no UDMA */
	.flags = ATA_FLAG_SLAVE_POSS,
	.pio_mask = ATA_PIO4,
	.mwdma_mask = ATA_MWDMA2,
	/* No UDMA */
	.port_ops = &serverworks_osb4_port_ops
	}, { /* CSB5 */
	.flags = ATA_FLAG_SLAVE_POSS,
	.pio_mask = ATA_PIO4,
	.mwdma_mask = ATA_MWDMA2,
	.udma_mask = ATA_UDMA4,
	.port_ops = &serverworks_csb_port_ops
	}, { /* CSB5 - later revisions*/
	.flags = ATA_FLAG_SLAVE_POSS,
	.pio_mask = ATA_PIO4,
	.mwdma_mask = ATA_MWDMA2,
	.udma_mask = ATA_UDMA5,
	.port_ops = &serverworks_csb_port_ops
	}
	};
	const struct ata_port_info *ppi[] = { &info[id->driver_data], NULL };
	struct scsi_host_template *sht = &serverworks_csb_sht;
	int rc;

	rc = pcim_enable_device(pdev);
	if (rc)
	return rc;

	rc = serverworks_fixup(pdev);

	/* OSB4 : South Bridge and IDE */
	if (pdev->device == PCI_DEVICE_ID_SERVERWORKS_OSB4IDE) {
	/* Select non UDMA capable OSB4 if we can't do fixups */
	if (rc < 0)
	ppi[0] = &info[1];
	sht = &serverworks_osb4_sht;
	}
	/* setup CSB5/CSB6 : South Bridge and IDE option RAID */
	else if ((pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5IDE) \|\|
	(pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE) \|\|
	(pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2)) {

	/* If the returned btr is the newer revision then
	select the right info block */
	if (rc == 3)
	ppi[0] = &info[3];

	/* Is this the 3rd channel CSB6 IDE ? */
	if (pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2)
	ppi[1] = &ata_dummy_port_info;
	}

	return ata_pci_bmdma_init_one(pdev, ppi, sht, NULL, 0);
	}

	#ifdef CONFIG_PM_SLEEP
	static int serverworks_reinit_one(struct pci_dev *pdev)
	{
	struct ata_host *host = pci_get_drvdata(pdev);
	int rc;

	rc = ata_pci_device_do_resume(pdev);
	if (rc)
	return rc;

	(void)serverworks_fixup(pdev);

	ata_host_resume(host);
	return 0;
	}
	#endif

	static const struct pci_device_id serverworks[] = {
	{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_OSB4IDE), 0},
	{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB5IDE), 2},
	{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6IDE), 2},
	{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2), 2},
	{ PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_HT1000IDE), 2},

	{ },
	};

	static struct pci_driver serverworks_pci_driver = {
	.name = DRV_NAME,
	.id_table = serverworks,
	.probe = serverworks_init_one,
	.remove = ata_pci_remove_one,
	#ifdef CONFIG_PM_SLEEP
	.suspend = ata_pci_device_suspend,
	.resume = serverworks_reinit_one,
	#endif
	};

	module_pci_driver(serverworks_pci_driver);

	MODULE_AUTHOR("Alan Cox");
	MODULE_DESCRIPTION("low-level driver for Serverworks OSB4/CSB5/CSB6");
	MODULE_LICENSE("GPL");
	MODULE_DEVICE_TABLE(pci, serverworks);
	MODULE_VERSION(DRV_VERSION);