drivers/ide/cmd64x.c - kernel/msm-5.4 - Gitiles

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * cmd64x.c: Enable interrupts at initialization time on Ultra/PCI machines.
  *           Due to massive hardware bugs, UltraDMA is only supported
  *           on the 646U2 and not on the 646U.
  *
  * Copyright (C) 1998		Eddie C. Dost  (ecd@skynet.be)
  * Copyright (C) 1998		David S. Miller (davem@redhat.com)
  *
  * Copyright (C) 1999-2002	Andre Hedrick <andre@linux-ide.org>
  * Copyright (C) 2007-2010	Bartlomiej Zolnierkiewicz
  * Copyright (C) 2007,2009	MontaVista Software, Inc. <source@mvista.com>
  */

 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/pci.h>
 #include <linux/ide.h>
 #include <linux/init.h>

 #include <asm/io.h>

 #define DRV_NAME "cmd64x"

 /*
  * CMD64x specific registers definition.
  */
 #define CFR		0x50
 #define   CFR_INTR_CH0		0x04

 #define	CMDTIM		0x52
 #define	ARTTIM0		0x53
 #define	DRWTIM0		0x54
 #define ARTTIM1 	0x55
 #define DRWTIM1		0x56
 #define ARTTIM23	0x57
 #define   ARTTIM23_DIS_RA2	0x04
 #define   ARTTIM23_DIS_RA3	0x08
 #define   ARTTIM23_INTR_CH1	0x10
 #define DRWTIM2		0x58
 #define BRST		0x59
 #define DRWTIM3		0x5b

 #define BMIDECR0	0x70
 #define MRDMODE		0x71
 #define   MRDMODE_INTR_CH0	0x04
 #define   MRDMODE_INTR_CH1	0x08
 #define UDIDETCR0	0x73
 #define DTPR0		0x74
 #define BMIDECR1	0x78
 #define BMIDECSR	0x79
 #define UDIDETCR1	0x7B
 #define DTPR1		0x7C

 static void cmd64x_program_timings(ide_drive_t *drive, u8 mode)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
 	int bus_speed = ide_pci_clk ? ide_pci_clk : 33;
 	const unsigned long T = 1000000 / bus_speed;
 	static const u8 recovery_values[] =
 		{15, 15, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 0};
 	static const u8 setup_values[] = {0x40, 0x40, 0x40, 0x80, 0, 0xc0};
 	static const u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
 	static const u8 drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM2, DRWTIM3};
 	struct ide_timing t;
 	u8 arttim = 0;

 	ide_timing_compute(drive, mode, &t, T, 0);

 	/*
 	 * In case we've got too long recovery phase, try to lengthen
 	 * the active phase
 	 */
 	if (t.recover > 16) {
 		t.active += t.recover - 16;
 		t.recover = 16;
 	}
 	if (t.active > 16)		/* shouldn't actually happen... */
 		t.active = 16;

 	/*
 	 * Convert values to internal chipset representation
 	 */
 	t.recover = recovery_values[t.recover];
 	t.active &= 0x0f;

 	/* Program the active/recovery counts into the DRWTIM register */
 	pci_write_config_byte(dev, drwtim_regs[drive->dn],
 			      (t.active << 4) | t.recover);

 	/*
 	 * The primary channel has individual address setup timing registers
 	 * for each drive and the hardware selects the slowest timing itself.
 	 * The secondary channel has one common register and we have to select
 	 * the slowest address setup timing ourselves.
 	 */
 	if (hwif->channel) {
 		ide_drive_t *pair = ide_get_pair_dev(drive);

 		if (pair) {
 			struct ide_timing tp;

 			ide_timing_compute(pair, pair->pio_mode, &tp, T, 0);
 			ide_timing_merge(&t, &tp, &t, IDE_TIMING_SETUP);
 			if (pair->dma_mode) {
 				ide_timing_compute(pair, pair->dma_mode,
 						&tp, T, 0);
 				ide_timing_merge(&tp, &t, &t, IDE_TIMING_SETUP);
 			}
 		}
 	}

 	if (t.setup > 5)		/* shouldn't actually happen... */
 		t.setup = 5;

 	/*
 	 * Program the address setup clocks into the ARTTIM registers.
 	 * Avoid clearing the secondary channel's interrupt bit.
 	 */
 	(void) pci_read_config_byte (dev, arttim_regs[drive->dn], &arttim);
 	if (hwif->channel)
 		arttim &= ~ARTTIM23_INTR_CH1;
 	arttim &= ~0xc0;
 	arttim |= setup_values[t.setup];
 	(void) pci_write_config_byte(dev, arttim_regs[drive->dn], arttim);
 }

 /*
  * Attempts to set drive's PIO mode.
  * Special cases are 8: prefetch off, 9: prefetch on (both never worked)
  */

 static void cmd64x_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 {
 	const u8 pio = drive->pio_mode - XFER_PIO_0;

 	/*
 	 * Filter out the prefetch control values
 	 * to prevent PIO5 from being programmed
 	 */
 	if (pio == 8 || pio == 9)
 		return;

 	cmd64x_program_timings(drive, XFER_PIO_0 + pio);
 }

 static void cmd64x_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 {
 	struct pci_dev *dev	= to_pci_dev(hwif->dev);
 	u8 unit			= drive->dn & 0x01;
 	u8 regU = 0, pciU	= hwif->channel ? UDIDETCR1 : UDIDETCR0;
 	const u8 speed		= drive->dma_mode;

 	pci_read_config_byte(dev, pciU, &regU);
 	regU &= ~(unit ? 0xCA : 0x35);

 	switch(speed) {
 	case XFER_UDMA_5:
 		regU |= unit ? 0x0A : 0x05;
 		break;
 	case XFER_UDMA_4:
 		regU |= unit ? 0x4A : 0x15;
 		break;
 	case XFER_UDMA_3:
 		regU |= unit ? 0x8A : 0x25;
 		break;
 	case XFER_UDMA_2:
 		regU |= unit ? 0x42 : 0x11;
 		break;
 	case XFER_UDMA_1:
 		regU |= unit ? 0x82 : 0x21;
 		break;
 	case XFER_UDMA_0:
 		regU |= unit ? 0xC2 : 0x31;
 		break;
 	case XFER_MW_DMA_2:
 	case XFER_MW_DMA_1:
 	case XFER_MW_DMA_0:
 		cmd64x_program_timings(drive, speed);
 		break;
 	}

 	pci_write_config_byte(dev, pciU, regU);
 }

 static void cmd648_clear_irq(ide_drive_t *drive)
 {
 	ide_hwif_t *hwif	= drive->hwif;
 	struct pci_dev *dev	= to_pci_dev(hwif->dev);
 	unsigned long base	= pci_resource_start(dev, 4);
 	u8  irq_mask		= hwif->channel ? MRDMODE_INTR_CH1 :
 						  MRDMODE_INTR_CH0;
 	u8  mrdmode		= inb(base + 1);

 	/* clear the interrupt bit */
 	outb((mrdmode & ~(MRDMODE_INTR_CH0 | MRDMODE_INTR_CH1)) | irq_mask,
 	     base + 1);
 }

 static void cmd64x_clear_irq(ide_drive_t *drive)
 {
 	ide_hwif_t *hwif	= drive->hwif;
 	struct pci_dev *dev	= to_pci_dev(hwif->dev);
 	int irq_reg		= hwif->channel ? ARTTIM23 : CFR;
 	u8  irq_mask		= hwif->channel ? ARTTIM23_INTR_CH1 :
 						  CFR_INTR_CH0;
 	u8  irq_stat		= 0;

 	(void) pci_read_config_byte(dev, irq_reg, &irq_stat);
 	/* clear the interrupt bit */
 	(void) pci_write_config_byte(dev, irq_reg, irq_stat | irq_mask);
 }

 static int cmd648_test_irq(ide_hwif_t *hwif)
 {
 	struct pci_dev *dev	= to_pci_dev(hwif->dev);
 	unsigned long base	= pci_resource_start(dev, 4);
 	u8 irq_mask		= hwif->channel ? MRDMODE_INTR_CH1 :
 						  MRDMODE_INTR_CH0;
 	u8 mrdmode		= inb(base + 1);

 	pr_debug("%s: mrdmode: 0x%02x irq_mask: 0x%02x\n",
 		 hwif->name, mrdmode, irq_mask);

 	return (mrdmode & irq_mask) ? 1 : 0;
 }

 static int cmd64x_test_irq(ide_hwif_t *hwif)
 {
 	struct pci_dev *dev	= to_pci_dev(hwif->dev);
 	int irq_reg		= hwif->channel ? ARTTIM23 : CFR;
 	u8  irq_mask		= hwif->channel ? ARTTIM23_INTR_CH1 :
 						  CFR_INTR_CH0;
 	u8  irq_stat		= 0;

 	(void) pci_read_config_byte(dev, irq_reg, &irq_stat);

 	pr_debug("%s: irq_stat: 0x%02x irq_mask: 0x%02x\n",
 		 hwif->name, irq_stat, irq_mask);

 	return (irq_stat & irq_mask) ? 1 : 0;
 }

 /*
  * ASUS P55T2P4D with CMD646 chipset revision 0x01 requires the old
  * event order for DMA transfers.
  */

 static int cmd646_1_dma_end(ide_drive_t *drive)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	u8 dma_stat = 0, dma_cmd = 0;

 	/* get DMA status */
 	dma_stat = inb(hwif->dma_base + ATA_DMA_STATUS);
 	/* read DMA command state */
 	dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
 	/* stop DMA */
 	outb(dma_cmd & ~1, hwif->dma_base + ATA_DMA_CMD);
 	/* clear the INTR & ERROR bits */
 	outb(dma_stat | 6, hwif->dma_base + ATA_DMA_STATUS);
 	/* verify good DMA status */
 	return (dma_stat & 7) != 4;
 }

 static int init_chipset_cmd64x(struct pci_dev *dev)
 {
 	u8 mrdmode = 0;

 	/* Set a good latency timer and cache line size value. */
 	(void) pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
 	/* FIXME: pci_set_master() to ensure a good latency timer value */

 	/*
 	 * Enable interrupts, select MEMORY READ LINE for reads.
 	 *
 	 * NOTE: although not mentioned in the PCI0646U specs,
 	 * bits 0-1 are write only and won't be read back as
 	 * set or not -- PCI0646U2 specs clarify this point.
 	 */
 	(void) pci_read_config_byte (dev, MRDMODE, &mrdmode);
 	mrdmode &= ~0x30;
 	(void) pci_write_config_byte(dev, MRDMODE, (mrdmode | 0x02));

 	return 0;
 }

 static u8 cmd64x_cable_detect(ide_hwif_t *hwif)
 {
 	struct pci_dev  *dev	= to_pci_dev(hwif->dev);
 	u8 bmidecsr = 0, mask	= hwif->channel ? 0x02 : 0x01;

 	switch (dev->device) {
 	case PCI_DEVICE_ID_CMD_648:
 	case PCI_DEVICE_ID_CMD_649:
  		pci_read_config_byte(dev, BMIDECSR, &bmidecsr);
 		return (bmidecsr & mask) ? ATA_CBL_PATA80 : ATA_CBL_PATA40;
 	default:
 		return ATA_CBL_PATA40;
 	}
 }

 static const struct ide_port_ops cmd64x_port_ops = {
 	.set_pio_mode		= cmd64x_set_pio_mode,
 	.set_dma_mode		= cmd64x_set_dma_mode,
 	.clear_irq		= cmd64x_clear_irq,
 	.test_irq		= cmd64x_test_irq,
 	.cable_detect		= cmd64x_cable_detect,
 };

 static const struct ide_port_ops cmd648_port_ops = {
 	.set_pio_mode		= cmd64x_set_pio_mode,
 	.set_dma_mode		= cmd64x_set_dma_mode,
 	.clear_irq		= cmd648_clear_irq,
 	.test_irq		= cmd648_test_irq,
 	.cable_detect		= cmd64x_cable_detect,
 };

 static const struct ide_dma_ops cmd646_rev1_dma_ops = {
 	.dma_host_set		= ide_dma_host_set,
 	.dma_setup		= ide_dma_setup,
 	.dma_start		= ide_dma_start,
 	.dma_end		= cmd646_1_dma_end,
 	.dma_test_irq		= ide_dma_test_irq,
 	.dma_lost_irq		= ide_dma_lost_irq,
 	.dma_timer_expiry	= ide_dma_sff_timer_expiry,
 	.dma_sff_read_status	= ide_dma_sff_read_status,
 };

 static const struct ide_port_info cmd64x_chipsets[] = {
 	{	/* 0: CMD643 */
 		.name		= DRV_NAME,
 		.init_chipset	= init_chipset_cmd64x,
 		.enablebits	= {{0x00,0x00,0x00}, {0x51,0x08,0x08}},
 		.port_ops	= &cmd64x_port_ops,
 		.host_flags	= IDE_HFLAG_CLEAR_SIMPLEX |
 				  IDE_HFLAG_ABUSE_PREFETCH |
 				  IDE_HFLAG_SERIALIZE,
 		.pio_mask	= ATA_PIO5,
 		.mwdma_mask	= ATA_MWDMA2,
 		.udma_mask	= 0x00, /* no udma */
 	},
 	{	/* 1: CMD646 */
 		.name		= DRV_NAME,
 		.init_chipset	= init_chipset_cmd64x,
 		.enablebits	= {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
 		.port_ops	= &cmd648_port_ops,
 		.host_flags	= IDE_HFLAG_ABUSE_PREFETCH |
 				  IDE_HFLAG_SERIALIZE,
 		.pio_mask	= ATA_PIO5,
 		.mwdma_mask	= ATA_MWDMA2,
 		.udma_mask	= ATA_UDMA2,
 	},
 	{	/* 2: CMD648 */
 		.name		= DRV_NAME,
 		.init_chipset	= init_chipset_cmd64x,
 		.enablebits	= {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
 		.port_ops	= &cmd648_port_ops,
 		.host_flags	= IDE_HFLAG_ABUSE_PREFETCH,
 		.pio_mask	= ATA_PIO5,
 		.mwdma_mask	= ATA_MWDMA2,
 		.udma_mask	= ATA_UDMA4,
 	},
 	{	/* 3: CMD649 */
 		.name		= DRV_NAME,
 		.init_chipset	= init_chipset_cmd64x,
 		.enablebits	= {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
 		.port_ops	= &cmd648_port_ops,
 		.host_flags	= IDE_HFLAG_ABUSE_PREFETCH,
 		.pio_mask	= ATA_PIO5,
 		.mwdma_mask	= ATA_MWDMA2,
 		.udma_mask	= ATA_UDMA5,
 	}
 };

 static int cmd64x_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 {
 	struct ide_port_info d;
 	u8 idx = id->driver_data;

 	d = cmd64x_chipsets[idx];

 	if (idx == 1) {
 		/*
 		 * UltraDMA only supported on PCI646U and PCI646U2, which
 		 * correspond to revisions 0x03, 0x05 and 0x07 respectively.
 		 * Actually, although the CMD tech support people won't
 		 * tell me the details, the 0x03 revision cannot support
 		 * UDMA correctly without hardware modifications, and even
 		 * then it only works with Quantum disks due to some
 		 * hold time assumptions in the 646U part which are fixed
 		 * in the 646U2.
 		 *
 		 * So we only do UltraDMA on revision 0x05 and 0x07 chipsets.
 		 */
 		if (dev->revision < 5) {
 			d.udma_mask = 0x00;
 			/*
 			 * The original PCI0646 didn't have the primary
 			 * channel enable bit, it appeared starting with
 			 * PCI0646U (i.e. revision ID 3).
 			 */
 			if (dev->revision < 3) {
 				d.enablebits[0].reg = 0;
 				d.port_ops = &cmd64x_port_ops;
 				if (dev->revision == 1)
 					d.dma_ops = &cmd646_rev1_dma_ops;
 			}
 		}
 	}

 	return ide_pci_init_one(dev, &d, NULL);
 }

 static const struct pci_device_id cmd64x_pci_tbl[] = {
 	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_643), 0 },
 	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_646), 1 },
 	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_648), 2 },
 	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_649), 3 },
 	{ 0, },
 };
 MODULE_DEVICE_TABLE(pci, cmd64x_pci_tbl);

 static struct pci_driver cmd64x_pci_driver = {
 	.name		= "CMD64x_IDE",
 	.id_table	= cmd64x_pci_tbl,
 	.probe		= cmd64x_init_one,
 	.remove		= ide_pci_remove,
 	.suspend	= ide_pci_suspend,
 	.resume		= ide_pci_resume,
 };

 static int __init cmd64x_ide_init(void)
 {
 	return ide_pci_register_driver(&cmd64x_pci_driver);
 }

 static void __exit cmd64x_ide_exit(void)
 {
 	pci_unregister_driver(&cmd64x_pci_driver);
 }

 module_init(cmd64x_ide_init);
 module_exit(cmd64x_ide_exit);

 MODULE_AUTHOR("Eddie Dost, David Miller, Andre Hedrick, Bartlomiej Zolnierkiewicz");
 MODULE_DESCRIPTION("PCI driver module for CMD64x IDE");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* cmd64x.c: Enable interrupts at initialization time on Ultra/PCI machines.
	* Due to massive hardware bugs, UltraDMA is only supported
	* on the 646U2 and not on the 646U.
	*
	* Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
	* Copyright (C) 1998 David S. Miller (davem@redhat.com)
	*
	* Copyright (C) 1999-2002 Andre Hedrick <andre@linux-ide.org>
	* Copyright (C) 2007-2010 Bartlomiej Zolnierkiewicz
	* Copyright (C) 2007,2009 MontaVista Software, Inc. <source@mvista.com>
	*/

	#include <linux/module.h>
	#include <linux/types.h>
	#include <linux/pci.h>
	#include <linux/ide.h>
	#include <linux/init.h>

	#include <asm/io.h>

	#define DRV_NAME "cmd64x"

	/*
	* CMD64x specific registers definition.
	*/
	#define CFR 0x50
	#define CFR_INTR_CH0 0x04

	#define CMDTIM 0x52
	#define ARTTIM0 0x53
	#define DRWTIM0 0x54
	#define ARTTIM1 0x55
	#define DRWTIM1 0x56
	#define ARTTIM23 0x57
	#define ARTTIM23_DIS_RA2 0x04
	#define ARTTIM23_DIS_RA3 0x08
	#define ARTTIM23_INTR_CH1 0x10
	#define DRWTIM2 0x58
	#define BRST 0x59
	#define DRWTIM3 0x5b

	#define BMIDECR0 0x70
	#define MRDMODE 0x71
	#define MRDMODE_INTR_CH0 0x04
	#define MRDMODE_INTR_CH1 0x08
	#define UDIDETCR0 0x73
	#define DTPR0 0x74
	#define BMIDECR1 0x78
	#define BMIDECSR 0x79
	#define UDIDETCR1 0x7B
	#define DTPR1 0x7C

	static void cmd64x_program_timings(ide_drive_t *drive, u8 mode)
	{
	ide_hwif_t *hwif = drive->hwif;
	struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
	int bus_speed = ide_pci_clk ? ide_pci_clk : 33;
	const unsigned long T = 1000000 / bus_speed;
	static const u8 recovery_values[] =
	{15, 15, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 0};
	static const u8 setup_values[] = {0x40, 0x40, 0x40, 0x80, 0, 0xc0};
	static const u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
	static const u8 drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM2, DRWTIM3};
	struct ide_timing t;
	u8 arttim = 0;

	ide_timing_compute(drive, mode, &t, T, 0);

	/*
	* In case we've got too long recovery phase, try to lengthen
	* the active phase
	*/
	if (t.recover > 16) {
	t.active += t.recover - 16;
	t.recover = 16;
	}
	if (t.active > 16) /* shouldn't actually happen... */
	t.active = 16;

	/*
	* Convert values to internal chipset representation
	*/
	t.recover = recovery_values[t.recover];
	t.active &= 0x0f;

	/* Program the active/recovery counts into the DRWTIM register */
	pci_write_config_byte(dev, drwtim_regs[drive->dn],
	(t.active << 4) \| t.recover);

	/*
	* The primary channel has individual address setup timing registers
	* for each drive and the hardware selects the slowest timing itself.
	* The secondary channel has one common register and we have to select
	* the slowest address setup timing ourselves.
	*/
	if (hwif->channel) {
	ide_drive_t *pair = ide_get_pair_dev(drive);

	if (pair) {
	struct ide_timing tp;

	ide_timing_compute(pair, pair->pio_mode, &tp, T, 0);
	ide_timing_merge(&t, &tp, &t, IDE_TIMING_SETUP);
	if (pair->dma_mode) {
	ide_timing_compute(pair, pair->dma_mode,
	&tp, T, 0);
	ide_timing_merge(&tp, &t, &t, IDE_TIMING_SETUP);
	}
	}
	}

	if (t.setup > 5) /* shouldn't actually happen... */
	t.setup = 5;

	/*
	* Program the address setup clocks into the ARTTIM registers.
	* Avoid clearing the secondary channel's interrupt bit.
	*/
	(void) pci_read_config_byte (dev, arttim_regs[drive->dn], &arttim);
	if (hwif->channel)
	arttim &= ~ARTTIM23_INTR_CH1;
	arttim &= ~0xc0;
	arttim \|= setup_values[t.setup];
	(void) pci_write_config_byte(dev, arttim_regs[drive->dn], arttim);
	}

	/*
	* Attempts to set drive's PIO mode.
	* Special cases are 8: prefetch off, 9: prefetch on (both never worked)
	*/

	static void cmd64x_set_pio_mode(ide_hwif_t hwif, ide_drive_t drive)
	{
	const u8 pio = drive->pio_mode - XFER_PIO_0;

	/*
	* Filter out the prefetch control values
	* to prevent PIO5 from being programmed
	*/
	if (pio == 8 \|\| pio == 9)
	return;

	cmd64x_program_timings(drive, XFER_PIO_0 + pio);
	}

	static void cmd64x_set_dma_mode(ide_hwif_t hwif, ide_drive_t drive)
	{
	struct pci_dev *dev = to_pci_dev(hwif->dev);
	u8 unit = drive->dn & 0x01;
	u8 regU = 0, pciU = hwif->channel ? UDIDETCR1 : UDIDETCR0;
	const u8 speed = drive->dma_mode;

	pci_read_config_byte(dev, pciU, &regU);
	regU &= ~(unit ? 0xCA : 0x35);

	switch(speed) {
	case XFER_UDMA_5:
	regU \|= unit ? 0x0A : 0x05;
	break;
	case XFER_UDMA_4:
	regU \|= unit ? 0x4A : 0x15;
	break;
	case XFER_UDMA_3:
	regU \|= unit ? 0x8A : 0x25;
	break;
	case XFER_UDMA_2:
	regU \|= unit ? 0x42 : 0x11;
	break;
	case XFER_UDMA_1:
	regU \|= unit ? 0x82 : 0x21;
	break;
	case XFER_UDMA_0:
	regU \|= unit ? 0xC2 : 0x31;
	break;
	case XFER_MW_DMA_2:
	case XFER_MW_DMA_1:
	case XFER_MW_DMA_0:
	cmd64x_program_timings(drive, speed);
	break;
	}

	pci_write_config_byte(dev, pciU, regU);
	}

	static void cmd648_clear_irq(ide_drive_t *drive)
	{
	ide_hwif_t *hwif = drive->hwif;
	struct pci_dev *dev = to_pci_dev(hwif->dev);
	unsigned long base = pci_resource_start(dev, 4);
	u8 irq_mask = hwif->channel ? MRDMODE_INTR_CH1 :
	MRDMODE_INTR_CH0;
	u8 mrdmode = inb(base + 1);

	/* clear the interrupt bit */
	outb((mrdmode & ~(MRDMODE_INTR_CH0 \| MRDMODE_INTR_CH1)) \| irq_mask,
	base + 1);
	}

	static void cmd64x_clear_irq(ide_drive_t *drive)
	{
	ide_hwif_t *hwif = drive->hwif;
	struct pci_dev *dev = to_pci_dev(hwif->dev);
	int irq_reg = hwif->channel ? ARTTIM23 : CFR;
	u8 irq_mask = hwif->channel ? ARTTIM23_INTR_CH1 :
	CFR_INTR_CH0;
	u8 irq_stat = 0;

	(void) pci_read_config_byte(dev, irq_reg, &irq_stat);
	/* clear the interrupt bit */
	(void) pci_write_config_byte(dev, irq_reg, irq_stat \| irq_mask);
	}

	static int cmd648_test_irq(ide_hwif_t *hwif)
	{
	struct pci_dev *dev = to_pci_dev(hwif->dev);
	unsigned long base = pci_resource_start(dev, 4);
	u8 irq_mask = hwif->channel ? MRDMODE_INTR_CH1 :
	MRDMODE_INTR_CH0;
	u8 mrdmode = inb(base + 1);

	pr_debug("%s: mrdmode: 0x%02x irq_mask: 0x%02x\n",
	hwif->name, mrdmode, irq_mask);

	return (mrdmode & irq_mask) ? 1 : 0;
	}

	static int cmd64x_test_irq(ide_hwif_t *hwif)
	{
	struct pci_dev *dev = to_pci_dev(hwif->dev);
	int irq_reg = hwif->channel ? ARTTIM23 : CFR;
	u8 irq_mask = hwif->channel ? ARTTIM23_INTR_CH1 :
	CFR_INTR_CH0;
	u8 irq_stat = 0;

	(void) pci_read_config_byte(dev, irq_reg, &irq_stat);

	pr_debug("%s: irq_stat: 0x%02x irq_mask: 0x%02x\n",
	hwif->name, irq_stat, irq_mask);

	return (irq_stat & irq_mask) ? 1 : 0;
	}

	/*
	* ASUS P55T2P4D with CMD646 chipset revision 0x01 requires the old
	* event order for DMA transfers.
	*/

	static int cmd646_1_dma_end(ide_drive_t *drive)
	{
	ide_hwif_t *hwif = drive->hwif;
	u8 dma_stat = 0, dma_cmd = 0;

	/* get DMA status */
	dma_stat = inb(hwif->dma_base + ATA_DMA_STATUS);
	/* read DMA command state */
	dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
	/* stop DMA */
	outb(dma_cmd & ~1, hwif->dma_base + ATA_DMA_CMD);
	/* clear the INTR & ERROR bits */
	outb(dma_stat \| 6, hwif->dma_base + ATA_DMA_STATUS);
	/* verify good DMA status */
	return (dma_stat & 7) != 4;
	}

	static int init_chipset_cmd64x(struct pci_dev *dev)
	{
	u8 mrdmode = 0;

	/* Set a good latency timer and cache line size value. */
	(void) pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
	/* FIXME: pci_set_master() to ensure a good latency timer value */

	/*
	* Enable interrupts, select MEMORY READ LINE for reads.
	*
	* NOTE: although not mentioned in the PCI0646U specs,
	* bits 0-1 are write only and won't be read back as
	* set or not -- PCI0646U2 specs clarify this point.
	*/
	(void) pci_read_config_byte (dev, MRDMODE, &mrdmode);
	mrdmode &= ~0x30;
	(void) pci_write_config_byte(dev, MRDMODE, (mrdmode \| 0x02));

	return 0;
	}

	static u8 cmd64x_cable_detect(ide_hwif_t *hwif)
	{
	struct pci_dev *dev = to_pci_dev(hwif->dev);
	u8 bmidecsr = 0, mask = hwif->channel ? 0x02 : 0x01;

	switch (dev->device) {
	case PCI_DEVICE_ID_CMD_648:
	case PCI_DEVICE_ID_CMD_649:
	pci_read_config_byte(dev, BMIDECSR, &bmidecsr);
	return (bmidecsr & mask) ? ATA_CBL_PATA80 : ATA_CBL_PATA40;
	default:
	return ATA_CBL_PATA40;
	}
	}

	static const struct ide_port_ops cmd64x_port_ops = {
	.set_pio_mode = cmd64x_set_pio_mode,
	.set_dma_mode = cmd64x_set_dma_mode,
	.clear_irq = cmd64x_clear_irq,
	.test_irq = cmd64x_test_irq,
	.cable_detect = cmd64x_cable_detect,
	};

	static const struct ide_port_ops cmd648_port_ops = {
	.set_pio_mode = cmd64x_set_pio_mode,
	.set_dma_mode = cmd64x_set_dma_mode,
	.clear_irq = cmd648_clear_irq,
	.test_irq = cmd648_test_irq,
	.cable_detect = cmd64x_cable_detect,
	};

	static const struct ide_dma_ops cmd646_rev1_dma_ops = {
	.dma_host_set = ide_dma_host_set,
	.dma_setup = ide_dma_setup,
	.dma_start = ide_dma_start,
	.dma_end = cmd646_1_dma_end,
	.dma_test_irq = ide_dma_test_irq,
	.dma_lost_irq = ide_dma_lost_irq,
	.dma_timer_expiry = ide_dma_sff_timer_expiry,
	.dma_sff_read_status = ide_dma_sff_read_status,
	};

	static const struct ide_port_info cmd64x_chipsets[] = {
	{ /* 0: CMD643 */
	.name = DRV_NAME,
	.init_chipset = init_chipset_cmd64x,
	.enablebits = {{0x00,0x00,0x00}, {0x51,0x08,0x08}},
	.port_ops = &cmd64x_port_ops,
	.host_flags = IDE_HFLAG_CLEAR_SIMPLEX \|
	IDE_HFLAG_ABUSE_PREFETCH \|
	IDE_HFLAG_SERIALIZE,
	.pio_mask = ATA_PIO5,
	.mwdma_mask = ATA_MWDMA2,
	.udma_mask = 0x00, /* no udma */
	},
	{ /* 1: CMD646 */
	.name = DRV_NAME,
	.init_chipset = init_chipset_cmd64x,
	.enablebits = {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
	.port_ops = &cmd648_port_ops,
	.host_flags = IDE_HFLAG_ABUSE_PREFETCH \|
	IDE_HFLAG_SERIALIZE,
	.pio_mask = ATA_PIO5,
	.mwdma_mask = ATA_MWDMA2,
	.udma_mask = ATA_UDMA2,
	},
	{ /* 2: CMD648 */
	.name = DRV_NAME,
	.init_chipset = init_chipset_cmd64x,
	.enablebits = {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
	.port_ops = &cmd648_port_ops,
	.host_flags = IDE_HFLAG_ABUSE_PREFETCH,
	.pio_mask = ATA_PIO5,
	.mwdma_mask = ATA_MWDMA2,
	.udma_mask = ATA_UDMA4,
	},
	{ /* 3: CMD649 */
	.name = DRV_NAME,
	.init_chipset = init_chipset_cmd64x,
	.enablebits = {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
	.port_ops = &cmd648_port_ops,
	.host_flags = IDE_HFLAG_ABUSE_PREFETCH,
	.pio_mask = ATA_PIO5,
	.mwdma_mask = ATA_MWDMA2,
	.udma_mask = ATA_UDMA5,
	}
	};

	static int cmd64x_init_one(struct pci_dev dev, const struct pci_device_id id)
	{
	struct ide_port_info d;
	u8 idx = id->driver_data;

	d = cmd64x_chipsets[idx];

	if (idx == 1) {
	/*
	* UltraDMA only supported on PCI646U and PCI646U2, which
	* correspond to revisions 0x03, 0x05 and 0x07 respectively.
	* Actually, although the CMD tech support people won't
	* tell me the details, the 0x03 revision cannot support
	* UDMA correctly without hardware modifications, and even
	* then it only works with Quantum disks due to some
	* hold time assumptions in the 646U part which are fixed
	* in the 646U2.
	*
	* So we only do UltraDMA on revision 0x05 and 0x07 chipsets.
	*/
	if (dev->revision < 5) {
	d.udma_mask = 0x00;
	/*
	* The original PCI0646 didn't have the primary
	* channel enable bit, it appeared starting with
	* PCI0646U (i.e. revision ID 3).
	*/
	if (dev->revision < 3) {
	d.enablebits[0].reg = 0;
	d.port_ops = &cmd64x_port_ops;
	if (dev->revision == 1)
	d.dma_ops = &cmd646_rev1_dma_ops;
	}
	}
	}

	return ide_pci_init_one(dev, &d, NULL);
	}

	static const struct pci_device_id cmd64x_pci_tbl[] = {
	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_643), 0 },
	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_646), 1 },
	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_648), 2 },
	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_649), 3 },
	{ 0, },
	};
	MODULE_DEVICE_TABLE(pci, cmd64x_pci_tbl);

	static struct pci_driver cmd64x_pci_driver = {
	.name = "CMD64x_IDE",
	.id_table = cmd64x_pci_tbl,
	.probe = cmd64x_init_one,
	.remove = ide_pci_remove,
	.suspend = ide_pci_suspend,
	.resume = ide_pci_resume,
	};

	static int __init cmd64x_ide_init(void)
	{
	return ide_pci_register_driver(&cmd64x_pci_driver);
	}

	static void __exit cmd64x_ide_exit(void)
	{
	pci_unregister_driver(&cmd64x_pci_driver);
	}

	module_init(cmd64x_ide_init);
	module_exit(cmd64x_ide_exit);

	MODULE_AUTHOR("Eddie Dost, David Miller, Andre Hedrick, Bartlomiej Zolnierkiewicz");
	MODULE_DESCRIPTION("PCI driver module for CMD64x IDE");
	MODULE_LICENSE("GPL");