[net-next-2.6.git] / drivers / ata / pata_cmd64x.c

/*
 * pata_cmd64x.c 	- CMD64x PATA for new ATA layer
 *			  (C) 2005 Red Hat Inc
 *			  Alan Cox <alan@lxorguk.ukuu.org.uk>
 *
 * Based upon
 * linux/drivers/ide/pci/cmd64x.c		Version 1.30	Sept 10, 2002
 *
 * cmd64x.c: Enable interrupts at initialization time on Ultra/PCI machines.
 *           Note, this driver is not used at all on other systems because
 *           there the "BIOS" has done all of the following already.
 *           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>
 *
 * TODO
 *	Testing work
 */

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

#define DRV_NAME "pata_cmd64x"
#define DRV_VERSION "0.3.1"

/*
 * CMD64x specific registers definition.
 */

enum {
	CFR 		= 0x50,
		CFR_INTR_CH0  = 0x02,
	CNTRL 		= 0x51,
		CNTRL_DIS_RA0 = 0x40,
		CNTRL_DIS_RA1 = 0x80,
		CNTRL_ENA_2ND = 0x08,
	CMDTIM 		= 0x52,
	ARTTIM0 	= 0x53,
	DRWTIM0 	= 0x54,
	ARTTIM1 	= 0x55,
	DRWTIM1 	= 0x56,
	ARTTIM23 	= 0x57,
		ARTTIM23_DIS_RA2  = 0x04,
		ARTTIM23_DIS_RA3  = 0x08,
		ARTTIM23_INTR_CH1 = 0x10,
	ARTTIM2 	= 0x57,
	ARTTIM3 	= 0x57,
	DRWTIM23	= 0x58,
	DRWTIM2 	= 0x58,
	BRST 		= 0x59,
	DRWTIM3 	= 0x5b,
	BMIDECR0	= 0x70,
	MRDMODE		= 0x71,
		MRDMODE_INTR_CH0 = 0x04,
		MRDMODE_INTR_CH1 = 0x08,
		MRDMODE_BLK_CH0  = 0x10,
		MRDMODE_BLK_CH1	 = 0x20,
	BMIDESR0	= 0x72,
	UDIDETCR0	= 0x73,
	DTPR0		= 0x74,
	BMIDECR1	= 0x78,
	BMIDECSR	= 0x79,
	BMIDESR1	= 0x7A,
	UDIDETCR1	= 0x7B,
	DTPR1		= 0x7C
};

static int cmd648_cable_detect(struct ata_port *ap)
{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	u8 r;

	/* Check cable detect bits */
	pci_read_config_byte(pdev, BMIDECSR, &r);
	if (r & (1 << ap->port_no))
		return ATA_CBL_PATA80;
	return ATA_CBL_PATA40;
}

/**
 *	cmd64x_set_piomode	-	set PIO and MWDMA timing
 *	@ap: ATA interface
 *	@adev: ATA device
 *	@mode: mode
 *
 *	Called to do the PIO and MWDMA mode setup.
 */

static void cmd64x_set_timing(struct ata_port *ap, struct ata_device *adev, u8 mode)
{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	struct ata_timing t;
	const unsigned long T = 1000000 / 33;
	const u8 setup_data[] = { 0x40, 0x40, 0x40, 0x80, 0x00 };

	u8 reg;

	/* Port layout is not logical so use a table */
	const u8 arttim_port[2][2] = {
		{ ARTTIM0, ARTTIM1 },
		{ ARTTIM23, ARTTIM23 }
	};
	const u8 drwtim_port[2][2] = {
		{ DRWTIM0, DRWTIM1 },
		{ DRWTIM2, DRWTIM3 }
	};

	int arttim = arttim_port[ap->port_no][adev->devno];
	int drwtim = drwtim_port[ap->port_no][adev->devno];

	/* ata_timing_compute is smart and will produce timings for MWDMA
	   that don't violate the drives PIO capabilities. */
	if (ata_timing_compute(adev, mode, &t, T, 0) < 0) {
		printk(KERN_ERR DRV_NAME ": mode computation failed.\n");
		return;
	}
	if (ap->port_no) {
		/* Slave has shared address setup */
		struct ata_device *pair = ata_dev_pair(adev);

		if (pair) {
			struct ata_timing tp;
			ata_timing_compute(pair, pair->pio_mode, &tp, T, 0);
			ata_timing_merge(&t, &tp, &t, ATA_TIMING_SETUP);
		}
	}

	printk(KERN_DEBUG DRV_NAME ": active %d recovery %d setup %d.\n",
		t.active, t.recover, t.setup);
	if (t.recover > 16) {
		t.active += t.recover - 16;
		t.recover = 16;
	}
	if (t.active > 16)
		t.active = 16;

	/* Now convert the clocks into values we can actually stuff into
	   the chip */

	if (t.recover > 1)
		t.recover--;
	else
		t.recover = 15;

	if (t.setup > 4)
		t.setup = 0xC0;
	else
		t.setup = setup_data[t.setup];

	t.active &= 0x0F;	/* 0 = 16 */

	/* Load setup timing */
	pci_read_config_byte(pdev, arttim, &reg);
	reg &= 0x3F;
	reg |= t.setup;
	pci_write_config_byte(pdev, arttim, reg);

	/* Load active/recovery */
	pci_write_config_byte(pdev, drwtim, (t.active << 4) | t.recover);
}

/**
 *	cmd64x_set_piomode	-	set initial PIO mode data
 *	@ap: ATA interface
 *	@adev: ATA device
 *
 *	Used when configuring the devices ot set the PIO timings. All the
 *	actual work is done by the PIO/MWDMA setting helper
 */

static void cmd64x_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
	cmd64x_set_timing(ap, adev, adev->pio_mode);
}

/**
 *	cmd64x_set_dmamode	-	set initial DMA mode data
 *	@ap: ATA interface
 *	@adev: ATA device
 *
 *	Called to do the DMA mode setup.
 */

static void cmd64x_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
	static const u8 udma_data[] = {
		0x30, 0x20, 0x10, 0x20, 0x10, 0x00
	};

	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	u8 regU, regD;

	int pciU = UDIDETCR0 + 8 * ap->port_no;
	int pciD = BMIDESR0 + 8 * ap->port_no;
	int shift = 2 * adev->devno;

	pci_read_config_byte(pdev, pciD, &regD);
	pci_read_config_byte(pdev, pciU, &regU);

	/* DMA bits off */
	regD &= ~(0x20 << adev->devno);
	/* DMA control bits */
	regU &= ~(0x30 << shift);
	/* DMA timing bits */
	regU &= ~(0x05 << adev->devno);

	if (adev->dma_mode >= XFER_UDMA_0) {
		/* Merge the timing value */
		regU |= udma_data[adev->dma_mode - XFER_UDMA_0] << shift;
		/* Merge the control bits */
		regU |= 1 << adev->devno; /* UDMA on */
		if (adev->dma_mode > 2)	/* 15nS timing */
			regU |= 4 << adev->devno;
	} else {
		regU &= ~ (1 << adev->devno);	/* UDMA off */
		cmd64x_set_timing(ap, adev, adev->dma_mode);
	}

	regD |= 0x20 << adev->devno;

	pci_write_config_byte(pdev, pciU, regU);
	pci_write_config_byte(pdev, pciD, regD);
}

/**
 *	cmd648_dma_stop	-	DMA stop callback
 *	@qc: Command in progress
 *
 *	DMA has completed.
 */

static void cmd648_bmdma_stop(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	u8 dma_intr;
	int dma_mask = ap->port_no ? ARTTIM23_INTR_CH1 : CFR_INTR_CH0;
	int dma_reg = ap->port_no ? ARTTIM2 : CFR;

	ata_bmdma_stop(qc);

	pci_read_config_byte(pdev, dma_reg, &dma_intr);
	pci_write_config_byte(pdev, dma_reg, dma_intr | dma_mask);
}

/**
 *	cmd64x_bmdma_stop	-	DMA stop callback
 *	@qc: Command in progress
 *
 *	Track the completion of live DMA commands and clear the
 *	host->private_data DMA tracking flag as we do.
 */

static void cmd64x_bmdma_stop(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	ata_bmdma_stop(qc);
	WARN_ON(ap->host->private_data != ap);
	ap->host->private_data = NULL;
}

/**
 *	cmd64x_qc_defer		-	Defer logic for chip limits
 *	@qc: queued command
 *
 *	Decide whether we can issue the command. Called under the host lock.
 */

static int cmd64x_qc_defer(struct ata_queued_cmd *qc)
{
	struct ata_host *host = qc->ap->host;
	struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
	int rc;
	int dma = 0;

	/* Apply the ATA rules first */
	rc = ata_std_qc_defer(qc);
	if (rc)
		return rc;

	if (qc->tf.protocol == ATAPI_PROT_DMA ||
			qc->tf.protocol == ATA_PROT_DMA)
		dma = 1;

	/* If the other port is not live then issue the command */
	if (alt == NULL || !alt->qc_active) {
		if (dma)
			host->private_data = qc->ap;
		return 0;
	}
	/* If there is a live DMA command then wait */
	if (host->private_data != NULL)
		return 	ATA_DEFER_PORT;
	if (dma)
		/* Cannot overlap our DMA command */
		return ATA_DEFER_PORT;
	return 0;
}

/**
 *	cmd64x_interrupt - ATA host interrupt handler
 *	@irq: irq line (unused)
 *	@dev_instance: pointer to our ata_host information structure
 *
 *	Our interrupt handler for PCI IDE devices.  Calls
 *	ata_sff_host_intr() for each port that is flagging an IRQ. We cannot
 *	use the defaults as we need to avoid touching status/altstatus during
 *	a DMA.
 *
 *	LOCKING:
 *	Obtains host lock during operation.
 *
 *	RETURNS:
 *	IRQ_NONE or IRQ_HANDLED.
 */
irqreturn_t cmd64x_interrupt(int irq, void *dev_instance)
{
	struct ata_host *host = dev_instance;
	struct pci_dev *pdev = to_pci_dev(host->dev);
	unsigned int i;
	unsigned int handled = 0;
	unsigned long flags;
	static const u8 irq_reg[2] = { CFR, ARTTIM23 };
	static const u8 irq_mask[2] = { 1 << 2, 1 << 4 };

	/* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
	spin_lock_irqsave(&host->lock, flags);

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap;
		u8 reg;

		pci_read_config_byte(pdev, irq_reg[i], &reg);
		ap = host->ports[i];
		if (ap && (reg & irq_mask[i]) &&
		    !(ap->flags & ATA_FLAG_DISABLED)) {
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->link.active_tag);
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
			    (qc->flags & ATA_QCFLAG_ACTIVE))
				handled |= ata_sff_host_intr(ap, qc);
		}
	}

	spin_unlock_irqrestore(&host->lock, flags);

	return IRQ_RETVAL(handled);
}
static struct scsi_host_template cmd64x_sht = {
	ATA_BMDMA_SHT(DRV_NAME),
};

static const struct ata_port_operations cmd64x_base_ops = {
	.inherits	= &ata_bmdma_port_ops,
	.set_piomode	= cmd64x_set_piomode,
	.set_dmamode	= cmd64x_set_dmamode,
	.bmdma_stop	= cmd64x_bmdma_stop,
	.qc_defer	= cmd64x_qc_defer,
};

static struct ata_port_operations cmd64x_port_ops = {
	.inherits	= &cmd64x_base_ops,
	.cable_detect	= ata_cable_40wire,
};

static struct ata_port_operations cmd646r1_port_ops = {
	.inherits	= &cmd64x_base_ops,
	.cable_detect	= ata_cable_40wire,
};

static struct ata_port_operations cmd648_port_ops = {
	.inherits	= &cmd64x_base_ops,
	.bmdma_stop	= cmd648_bmdma_stop,
	.cable_detect	= cmd648_cable_detect,
	.qc_defer	= ata_std_qc_defer
};

static int cmd64x_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
	u32 class_rev;

	static const struct ata_port_info cmd_info[6] = {
		{	/* CMD 643 - no UDMA */
			.flags = ATA_FLAG_SLAVE_POSS,
			.pio_mask = ATA_PIO4,
			.mwdma_mask = ATA_MWDMA2,
			.port_ops = &cmd64x_port_ops
		},
		{	/* CMD 646 with broken UDMA */
			.flags = ATA_FLAG_SLAVE_POSS,
			.pio_mask = ATA_PIO4,
			.mwdma_mask = ATA_MWDMA2,
			.port_ops = &cmd64x_port_ops
		},
		{	/* CMD 646 with working UDMA */
			.flags = ATA_FLAG_SLAVE_POSS,
			.pio_mask = ATA_PIO4,
			.mwdma_mask = ATA_MWDMA2,
			.udma_mask = ATA_UDMA2,
			.port_ops = &cmd64x_port_ops
		},
		{	/* CMD 646 rev 1  */
			.flags = ATA_FLAG_SLAVE_POSS,
			.pio_mask = ATA_PIO4,
			.mwdma_mask = ATA_MWDMA2,
			.port_ops = &cmd646r1_port_ops
		},
		{	/* CMD 648 */
			.flags = ATA_FLAG_SLAVE_POSS,
			.pio_mask = ATA_PIO4,
			.mwdma_mask = ATA_MWDMA2,
			.udma_mask = ATA_UDMA4,
			.port_ops = &cmd648_port_ops
		},
		{	/* CMD 649 */
			.flags = ATA_FLAG_SLAVE_POSS,
			.pio_mask = ATA_PIO4,
			.mwdma_mask = ATA_MWDMA2,
			.udma_mask = ATA_UDMA5,
			.port_ops = &cmd648_port_ops
		}
	};
	const struct ata_port_info *ppi[] = { &cmd_info[id->driver_data], NULL };
	u8 mrdmode;
	int rc;
	struct ata_host *host;

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

	pci_read_config_dword(pdev, PCI_CLASS_REVISION, &class_rev);
	class_rev &= 0xFF;

	if (id->driver_data == 0)	/* 643 */
		ata_pci_bmdma_clear_simplex(pdev);

	if (pdev->device == PCI_DEVICE_ID_CMD_646) {
		/* Does UDMA work ? */
		if (class_rev > 4)
			ppi[0] = &cmd_info[2];
		/* Early rev with other problems ? */
		else if (class_rev == 1)
			ppi[0] = &cmd_info[3];
	}


	pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 64);
	pci_read_config_byte(pdev, MRDMODE, &mrdmode);
	mrdmode &= ~ 0x30;	/* IRQ set up */
	mrdmode |= 0x02;	/* Memory read line enable */
	pci_write_config_byte(pdev, MRDMODE, mrdmode);

	/* PPC specific fixup copied from old driver */
#ifdef CONFIG_PPC
	pci_write_config_byte(pdev, UDIDETCR0, 0xF0);
#endif
	rc = ata_pci_sff_prepare_host(pdev, ppi, &host);
	if (rc)
		return rc;
	/* We use this pointer to track the AP which has DMA running */
	host->private_data = NULL;

	pci_set_master(pdev);
	return ata_pci_sff_activate_host(host, cmd64x_interrupt, &cmd64x_sht);
}

#ifdef CONFIG_PM
static int cmd64x_reinit_one(struct pci_dev *pdev)
{
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
	u8 mrdmode;
	int rc;

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

	pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 64);
	pci_read_config_byte(pdev, MRDMODE, &mrdmode);
	mrdmode &= ~ 0x30;	/* IRQ set up */
	mrdmode |= 0x02;	/* Memory read line enable */
	pci_write_config_byte(pdev, MRDMODE, mrdmode);
#ifdef CONFIG_PPC
	pci_write_config_byte(pdev, UDIDETCR0, 0xF0);
#endif
	ata_host_resume(host);
	return 0;
}
#endif

static const struct pci_device_id cmd64x[] = {
	{ 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), 4 },
	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_649), 5 },

	{ },
};

static struct pci_driver cmd64x_pci_driver = {
	.name 		= DRV_NAME,
	.id_table	= cmd64x,
	.probe 		= cmd64x_init_one,
	.remove		= ata_pci_remove_one,
#ifdef CONFIG_PM
	.suspend	= ata_pci_device_suspend,
	.resume		= cmd64x_reinit_one,
#endif
};

static int __init cmd64x_init(void)
{
	return pci_register_driver(&cmd64x_pci_driver);
}

static void __exit cmd64x_exit(void)
{
	pci_unregister_driver(&cmd64x_pci_driver);
}

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for CMD64x series PATA controllers");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, cmd64x);
MODULE_VERSION(DRV_VERSION);

module_init(cmd64x_init);
module_exit(cmd64x_exit);
Commit	Line	Data
669a5db4	1	/*
fb9f8905	2	* pata_cmd64x.c - CMD64x PATA for new ATA layer
669a5db4	3	* (C) 2005 Red Hat Inc
ab771630	4	* Alan Cox <alan@lxorguk.ukuu.org.uk>
669a5db4 JG	5	*
	6	* Based upon
	7	* linux/drivers/ide/pci/cmd64x.c Version 1.30 Sept 10, 2002
	8	*
	9	* cmd64x.c: Enable interrupts at initialization time on Ultra/PCI machines.
	10	* Note, this driver is not used at all on other systems because
	11	* there the "BIOS" has done all of the following already.
	12	* Due to massive hardware bugs, UltraDMA is only supported
	13	* on the 646U2 and not on the 646U.
	14	*
	15	* Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
	16	* Copyright (C) 1998 David S. Miller (davem@redhat.com)
	17	*
	18	* Copyright (C) 1999-2002 Andre Hedrick <andre@linux-ide.org>
	19	*
	20	* TODO
	21	* Testing work
	22	*/
85cd7251	23
669a5db4 JG	24	#include <linux/kernel.h>
	25	#include <linux/module.h>
	26	#include <linux/pci.h>
	27	#include <linux/init.h>
	28	#include <linux/blkdev.h>
	29	#include <linux/delay.h>
	30	#include <scsi/scsi_host.h>
	31	#include <linux/libata.h>
	32
	33	#define DRV_NAME "pata_cmd64x"
d4374439	34	#define DRV_VERSION "0.3.1"
669a5db4 JG	35
	36	/*
	37	* CMD64x specific registers definition.
	38	*/
85cd7251	39
669a5db4 JG	40	enum {
	41	CFR = 0x50,
	42	CFR_INTR_CH0 = 0x02,
	43	CNTRL = 0x51,
	44	CNTRL_DIS_RA0 = 0x40,
	45	CNTRL_DIS_RA1 = 0x80,
	46	CNTRL_ENA_2ND = 0x08,
	47	CMDTIM = 0x52,
	48	ARTTIM0 = 0x53,
	49	DRWTIM0 = 0x54,
	50	ARTTIM1 = 0x55,
	51	DRWTIM1 = 0x56,
	52	ARTTIM23 = 0x57,
	53	ARTTIM23_DIS_RA2 = 0x04,
	54	ARTTIM23_DIS_RA3 = 0x08,
	55	ARTTIM23_INTR_CH1 = 0x10,
	56	ARTTIM2 = 0x57,
	57	ARTTIM3 = 0x57,
	58	DRWTIM23 = 0x58,
	59	DRWTIM2 = 0x58,
	60	BRST = 0x59,
	61	DRWTIM3 = 0x5b,
	62	BMIDECR0 = 0x70,
	63	MRDMODE = 0x71,
	64	MRDMODE_INTR_CH0 = 0x04,
	65	MRDMODE_INTR_CH1 = 0x08,
	66	MRDMODE_BLK_CH0 = 0x10,
	67	MRDMODE_BLK_CH1 = 0x20,
	68	BMIDESR0 = 0x72,
	69	UDIDETCR0 = 0x73,
	70	DTPR0 = 0x74,
	71	BMIDECR1 = 0x78,
	72	BMIDECSR = 0x79,
	73	BMIDESR1 = 0x7A,
	74	UDIDETCR1 = 0x7B,
	75	DTPR1 = 0x7C
	76	};
	77
a73984a0	78	static int cmd648_cable_detect(struct ata_port *ap)
669a5db4 JG	79	{
	80	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	81	u8 r;
	82
	83	/* Check cable detect bits */
	84	pci_read_config_byte(pdev, BMIDECSR, &r);
	85	if (r & (1 << ap->port_no))
a73984a0 JG	86	return ATA_CBL_PATA80;
a73984a0 JG	87	return ATA_CBL_PATA40;
669a5db4 JG	88	}
	89
	90	/**
05d1efff	91	* cmd64x_set_piomode - set PIO and MWDMA timing
669a5db4 JG	92	* @ap: ATA interface
669a5db4 JG	93	* @adev: ATA device
05d1efff	94	* @mode: mode
669a5db4	95	*
05d1efff	96	* Called to do the PIO and MWDMA mode setup.
669a5db4	97	*/
85cd7251	98
05d1efff	99	static void cmd64x_set_timing(struct ata_port ap, struct ata_device adev, u8 mode)
669a5db4 JG	100	{
	101	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	102	struct ata_timing t;
	103	const unsigned long T = 1000000 / 33;
	104	const u8 setup_data[] = { 0x40, 0x40, 0x40, 0x80, 0x00 };
85cd7251	105
669a5db4	106	u8 reg;
85cd7251	107
669a5db4	108	/* Port layout is not logical so use a table */
85cd7251	109	const u8 arttim_port[2][2] = {
669a5db4 JG	110	{ ARTTIM0, ARTTIM1 },
	111	{ ARTTIM23, ARTTIM23 }
	112	};
	113	const u8 drwtim_port[2][2] = {
	114	{ DRWTIM0, DRWTIM1 },
	115	{ DRWTIM2, DRWTIM3 }
	116	};
85cd7251	117
669a5db4 JG	118	int arttim = arttim_port[ap->port_no][adev->devno];
669a5db4 JG	119	int drwtim = drwtim_port[ap->port_no][adev->devno];
85cd7251	120
05d1efff AC	121	/* ata_timing_compute is smart and will produce timings for MWDMA
	122	that don't violate the drives PIO capabilities. */
	123	if (ata_timing_compute(adev, mode, &t, T, 0) < 0) {
669a5db4 JG	124	printk(KERN_ERR DRV_NAME ": mode computation failed.\n");
	125	return;
	126	}
	127	if (ap->port_no) {
	128	/* Slave has shared address setup */
	129	struct ata_device *pair = ata_dev_pair(adev);
85cd7251	130
669a5db4 JG	131	if (pair) {
	132	struct ata_timing tp;
	133	ata_timing_compute(pair, pair->pio_mode, &tp, T, 0);
	134	ata_timing_merge(&t, &tp, &t, ATA_TIMING_SETUP);
	135	}
	136	}
85cd7251	137
669a5db4 JG	138	printk(KERN_DEBUG DRV_NAME ": active %d recovery %d setup %d.\n",
	139	t.active, t.recover, t.setup);
	140	if (t.recover > 16) {
	141	t.active += t.recover - 16;
	142	t.recover = 16;
	143	}
	144	if (t.active > 16)
	145	t.active = 16;
85cd7251	146
669a5db4 JG	147	/* Now convert the clocks into values we can actually stuff into
669a5db4 JG	148	the chip */
85cd7251	149
669a5db4 JG	150	if (t.recover > 1)
	151	t.recover--;
	152	else
	153	t.recover = 15;
85cd7251	154
669a5db4 JG	155	if (t.setup > 4)
	156	t.setup = 0xC0;
	157	else
	158	t.setup = setup_data[t.setup];
85cd7251	159
669a5db4	160	t.active &= 0x0F; /* 0 = 16 */
85cd7251	161
669a5db4 JG	162	/* Load setup timing */
	163	pci_read_config_byte(pdev, arttim, &reg);
	164	reg &= 0x3F;
	165	reg \|= t.setup;
	166	pci_write_config_byte(pdev, arttim, reg);
85cd7251	167
669a5db4	168	/* Load active/recovery */
85cd7251	169	pci_write_config_byte(pdev, drwtim, (t.active << 4) \| t.recover);
669a5db4 JG	170	}
669a5db4 JG	171
05d1efff AC	172	/**
	173	* cmd64x_set_piomode - set initial PIO mode data
	174	* @ap: ATA interface
	175	* @adev: ATA device
	176	*
	177	* Used when configuring the devices ot set the PIO timings. All the
	178	* actual work is done by the PIO/MWDMA setting helper
	179	*/
	180
	181	static void cmd64x_set_piomode(struct ata_port ap, struct ata_device adev)
	182	{
	183	cmd64x_set_timing(ap, adev, adev->pio_mode);
	184	}
	185
669a5db4 JG	186	/**
	187	* cmd64x_set_dmamode - set initial DMA mode data
	188	* @ap: ATA interface
	189	* @adev: ATA device
	190	*
	191	* Called to do the DMA mode setup.
	192	*/
85cd7251	193
669a5db4 JG	194	static void cmd64x_set_dmamode(struct ata_port ap, struct ata_device adev)
	195	{
	196	static const u8 udma_data[] = {
6a40da02	197	0x30, 0x20, 0x10, 0x20, 0x10, 0x00
669a5db4	198	};
85cd7251	199
669a5db4 JG	200	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	201	u8 regU, regD;
	202
	203	int pciU = UDIDETCR0 + 8 * ap->port_no;
	204	int pciD = BMIDESR0 + 8 * ap->port_no;
	205	int shift = 2 * adev->devno;
85cd7251	206
669a5db4 JG	207	pci_read_config_byte(pdev, pciD, &regD);
	208	pci_read_config_byte(pdev, pciU, &regU);
	209
6a40da02 AC	210	/* DMA bits off */
	211	regD &= ~(0x20 << adev->devno);
	212	/* DMA control bits */
	213	regU &= ~(0x30 << shift);
	214	/* DMA timing bits */
	215	regU &= ~(0x05 << adev->devno);
85cd7251	216
6a40da02	217	if (adev->dma_mode >= XFER_UDMA_0) {
24b7ce98	218	/* Merge the timing value */
669a5db4	219	regU \|= udma_data[adev->dma_mode - XFER_UDMA_0] << shift;
6a40da02 AC	220	/* Merge the control bits */
	221	regU \|= 1 << adev->devno; /* UDMA on */
	222	if (adev->dma_mode > 2) /* 15nS timing */
	223	regU \|= 4 << adev->devno;
05d1efff AC	224	} else {
	225	regU &= ~ (1 << adev->devno); /* UDMA off */
	226	cmd64x_set_timing(ap, adev, adev->dma_mode);
	227	}
669a5db4 JG	228
	229	regD \|= 0x20 << adev->devno;
	230
	231	pci_write_config_byte(pdev, pciU, regU);
	232	pci_write_config_byte(pdev, pciD, regD);
	233	}
	234
	235	/**
	236	* cmd648_dma_stop - DMA stop callback
	237	* @qc: Command in progress
	238	*
	239	* DMA has completed.
	240	*/
	241
	242	static void cmd648_bmdma_stop(struct ata_queued_cmd *qc)
	243	{
	244	struct ata_port *ap = qc->ap;
	245	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	246	u8 dma_intr;
6a40da02 AC	247	int dma_mask = ap->port_no ? ARTTIM23_INTR_CH1 : CFR_INTR_CH0;
6a40da02 AC	248	int dma_reg = ap->port_no ? ARTTIM2 : CFR;
85cd7251	249
669a5db4	250	ata_bmdma_stop(qc);
85cd7251	251
669a5db4 JG	252	pci_read_config_byte(pdev, dma_reg, &dma_intr);
	253	pci_write_config_byte(pdev, dma_reg, dma_intr \| dma_mask);
	254	}
85cd7251	255
669a5db4	256	/**
d4374439	257	* cmd64x_bmdma_stop - DMA stop callback
669a5db4 JG	258	* @qc: Command in progress
669a5db4 JG	259	*
d4374439 AC	260	* Track the completion of live DMA commands and clear the
d4374439 AC	261	* host->private_data DMA tracking flag as we do.
669a5db4 JG	262	*/
669a5db4 JG	263
d4374439	264	static void cmd64x_bmdma_stop(struct ata_queued_cmd *qc)
669a5db4	265	{
d4374439	266	struct ata_port *ap = qc->ap;
669a5db4	267	ata_bmdma_stop(qc);
d4374439 AC	268	WARN_ON(ap->host->private_data != ap);
	269	ap->host->private_data = NULL;
	270	}
	271
	272	/**
	273	* cmd64x_qc_defer - Defer logic for chip limits
	274	* @qc: queued command
	275	*
	276	* Decide whether we can issue the command. Called under the host lock.
	277	*/
	278
	279	static int cmd64x_qc_defer(struct ata_queued_cmd *qc)
	280	{
	281	struct ata_host *host = qc->ap->host;
	282	struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
	283	int rc;
	284	int dma = 0;
	285
	286	/* Apply the ATA rules first */
	287	rc = ata_std_qc_defer(qc);
	288	if (rc)
	289	return rc;
	290
	291	if (qc->tf.protocol == ATAPI_PROT_DMA \|\|
	292	qc->tf.protocol == ATA_PROT_DMA)
	293	dma = 1;
	294
	295	/* If the other port is not live then issue the command */
	296	if (alt == NULL \|\| !alt->qc_active) {
	297	if (dma)
	298	host->private_data = qc->ap;
	299	return 0;
	300	}
	301	/* If there is a live DMA command then wait */
	302	if (host->private_data != NULL)
	303	return ATA_DEFER_PORT;
	304	if (dma)
	305	/* Cannot overlap our DMA command */
	306	return ATA_DEFER_PORT;
	307	return 0;
669a5db4	308	}
85cd7251	309
d4374439 AC	310	/**
	311	* cmd64x_interrupt - ATA host interrupt handler
	312	* @irq: irq line (unused)
	313	* @dev_instance: pointer to our ata_host information structure
	314	*
	315	* Our interrupt handler for PCI IDE devices. Calls
	316	* ata_sff_host_intr() for each port that is flagging an IRQ. We cannot
	317	* use the defaults as we need to avoid touching status/altstatus during
	318	* a DMA.
	319	*
	320	* LOCKING:
	321	* Obtains host lock during operation.
	322	*
	323	* RETURNS:
	324	* IRQ_NONE or IRQ_HANDLED.
	325	*/
	326	irqreturn_t cmd64x_interrupt(int irq, void *dev_instance)
	327	{
	328	struct ata_host *host = dev_instance;
	329	struct pci_dev *pdev = to_pci_dev(host->dev);
	330	unsigned int i;
	331	unsigned int handled = 0;
	332	unsigned long flags;
	333	static const u8 irq_reg[2] = { CFR, ARTTIM23 };
	334	static const u8 irq_mask[2] = { 1 << 2, 1 << 4 };
	335
	336	/* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
	337	spin_lock_irqsave(&host->lock, flags);
	338
	339	for (i = 0; i < host->n_ports; i++) {
	340	struct ata_port *ap;
	341	u8 reg;
	342
	343	pci_read_config_byte(pdev, irq_reg[i], &reg);
	344	ap = host->ports[i];
	345	if (ap && (reg & irq_mask[i]) &&
	346	!(ap->flags & ATA_FLAG_DISABLED)) {
	347	struct ata_queued_cmd *qc;
	348
	349	qc = ata_qc_from_tag(ap, ap->link.active_tag);
	350	if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
	351	(qc->flags & ATA_QCFLAG_ACTIVE))
	352	handled \|= ata_sff_host_intr(ap, qc);
	353	}
	354	}
	355
	356	spin_unlock_irqrestore(&host->lock, flags);
	357
	358	return IRQ_RETVAL(handled);
	359	}
669a5db4	360	static struct scsi_host_template cmd64x_sht = {
68d1d07b	361	ATA_BMDMA_SHT(DRV_NAME),
669a5db4 JG	362	};
669a5db4 JG	363
029cfd6b TH	364	static const struct ata_port_operations cmd64x_base_ops = {
029cfd6b TH	365	.inherits = &ata_bmdma_port_ops,
669a5db4 JG	366	.set_piomode = cmd64x_set_piomode,
669a5db4 JG	367	.set_dmamode = cmd64x_set_dmamode,
d4374439 AC	368	.bmdma_stop = cmd64x_bmdma_stop,
d4374439 AC	369	.qc_defer = cmd64x_qc_defer,
85cd7251	370	};
669a5db4	371
029cfd6b TH	372	static struct ata_port_operations cmd64x_port_ops = {
029cfd6b TH	373	.inherits = &cmd64x_base_ops,
a73984a0	374	.cable_detect = ata_cable_40wire,
029cfd6b	375	};
669a5db4	376
029cfd6b TH	377	static struct ata_port_operations cmd646r1_port_ops = {
029cfd6b TH	378	.inherits = &cmd64x_base_ops,
029cfd6b	379	.cable_detect = ata_cable_40wire,
85cd7251	380	};
669a5db4 JG	381
669a5db4 JG	382	static struct ata_port_operations cmd648_port_ops = {
029cfd6b	383	.inherits = &cmd64x_base_ops,
669a5db4	384	.bmdma_stop = cmd648_bmdma_stop,
029cfd6b	385	.cable_detect = cmd648_cable_detect,
d4374439	386	.qc_defer = ata_std_qc_defer
85cd7251 JG	387	};
85cd7251 JG	388
669a5db4 JG	389	static int cmd64x_init_one(struct pci_dev pdev, const struct pci_device_id id)
	390	{
	391	u32 class_rev;
85cd7251	392
1626aeb8	393	static const struct ata_port_info cmd_info[6] = {
669a5db4	394	{ /* CMD 643 - no UDMA */
1d2808fd	395	.flags = ATA_FLAG_SLAVE_POSS,
14bdef98 EIB	396	.pio_mask = ATA_PIO4,
14bdef98 EIB	397	.mwdma_mask = ATA_MWDMA2,
669a5db4 JG	398	.port_ops = &cmd64x_port_ops
	399	},
	400	{ /* CMD 646 with broken UDMA */
1d2808fd	401	.flags = ATA_FLAG_SLAVE_POSS,
14bdef98 EIB	402	.pio_mask = ATA_PIO4,
14bdef98 EIB	403	.mwdma_mask = ATA_MWDMA2,
669a5db4 JG	404	.port_ops = &cmd64x_port_ops
	405	},
	406	{ /* CMD 646 with working UDMA */
1d2808fd	407	.flags = ATA_FLAG_SLAVE_POSS,
14bdef98 EIB	408	.pio_mask = ATA_PIO4,
14bdef98 EIB	409	.mwdma_mask = ATA_MWDMA2,
dbf0c89c	410	.udma_mask = ATA_UDMA2,
669a5db4 JG	411	.port_ops = &cmd64x_port_ops
	412	},
	413	{ /* CMD 646 rev 1 */
1d2808fd	414	.flags = ATA_FLAG_SLAVE_POSS,
14bdef98 EIB	415	.pio_mask = ATA_PIO4,
14bdef98 EIB	416	.mwdma_mask = ATA_MWDMA2,
669a5db4 JG	417	.port_ops = &cmd646r1_port_ops
	418	},
	419	{ /* CMD 648 */
1d2808fd	420	.flags = ATA_FLAG_SLAVE_POSS,
14bdef98 EIB	421	.pio_mask = ATA_PIO4,
14bdef98 EIB	422	.mwdma_mask = ATA_MWDMA2,
dbf0c89c	423	.udma_mask = ATA_UDMA4,
669a5db4 JG	424	.port_ops = &cmd648_port_ops
	425	},
	426	{ /* CMD 649 */
1d2808fd	427	.flags = ATA_FLAG_SLAVE_POSS,
14bdef98 EIB	428	.pio_mask = ATA_PIO4,
14bdef98 EIB	429	.mwdma_mask = ATA_MWDMA2,
dbf0c89c	430	.udma_mask = ATA_UDMA5,
669a5db4 JG	431	.port_ops = &cmd648_port_ops
	432	}
	433	};
1626aeb8	434	const struct ata_port_info *ppi[] = { &cmd_info[id->driver_data], NULL };
669a5db4	435	u8 mrdmode;
f08048e9	436	int rc;
d4374439	437	struct ata_host *host;
f08048e9 TH	438
	439	rc = pcim_enable_device(pdev);
	440	if (rc)
	441	return rc;
85cd7251	442
669a5db4 JG	443	pci_read_config_dword(pdev, PCI_CLASS_REVISION, &class_rev);
669a5db4 JG	444	class_rev &= 0xFF;
85cd7251	445
669a5db4	446	if (id->driver_data == 0) /* 643 */
9363c382	447	ata_pci_bmdma_clear_simplex(pdev);
85cd7251	448
669a5db4 JG	449	if (pdev->device == PCI_DEVICE_ID_CMD_646) {
	450	/* Does UDMA work ? */
	451	if (class_rev > 4)
1626aeb8	452	ppi[0] = &cmd_info[2];
669a5db4 JG	453	/* Early rev with other problems ? */
669a5db4 JG	454	else if (class_rev == 1)
1626aeb8	455	ppi[0] = &cmd_info[3];
669a5db4 JG	456	}
669a5db4 JG	457
d4374439	458
669a5db4 JG	459	pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 64);
	460	pci_read_config_byte(pdev, MRDMODE, &mrdmode);
	461	mrdmode &= ~ 0x30; /* IRQ set up */
	462	mrdmode \|= 0x02; /* Memory read line enable */
	463	pci_write_config_byte(pdev, MRDMODE, mrdmode);
85cd7251	464
669a5db4 JG	465	/* PPC specific fixup copied from old driver */
	466	#ifdef CONFIG_PPC
	467	pci_write_config_byte(pdev, UDIDETCR0, 0xF0);
	468	#endif
d4374439 AC	469	rc = ata_pci_sff_prepare_host(pdev, ppi, &host);
	470	if (rc)
	471	return rc;
	472	/* We use this pointer to track the AP which has DMA running */
	473	host->private_data = NULL;
85cd7251	474
d4374439 AC	475	pci_set_master(pdev);
d4374439 AC	476	return ata_pci_sff_activate_host(host, cmd64x_interrupt, &cmd64x_sht);
669a5db4 JG	477	}
669a5db4 JG	478
438ac6d5	479	#ifdef CONFIG_PM
7f72a379 AC	480	static int cmd64x_reinit_one(struct pci_dev *pdev)
7f72a379 AC	481	{
f08048e9	482	struct ata_host *host = dev_get_drvdata(&pdev->dev);
7f72a379	483	u8 mrdmode;
f08048e9 TH	484	int rc;
	485
	486	rc = ata_pci_device_do_resume(pdev);
	487	if (rc)
	488	return rc;
	489
7f72a379 AC	490	pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 64);
	491	pci_read_config_byte(pdev, MRDMODE, &mrdmode);
	492	mrdmode &= ~ 0x30; /* IRQ set up */
	493	mrdmode \|= 0x02; /* Memory read line enable */
	494	pci_write_config_byte(pdev, MRDMODE, mrdmode);
	495	#ifdef CONFIG_PPC
	496	pci_write_config_byte(pdev, UDIDETCR0, 0xF0);
	497	#endif
f08048e9 TH	498	ata_host_resume(host);
f08048e9 TH	499	return 0;
7f72a379	500	}
438ac6d5	501	#endif
7f72a379	502
2d2744fc JG	503	static const struct pci_device_id cmd64x[] = {
	504	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_643), 0 },
	505	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_646), 1 },
	506	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_648), 4 },
	507	{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_649), 5 },
	508
	509	{ },
669a5db4 JG	510	};
	511
	512	static struct pci_driver cmd64x_pci_driver = {
2d2744fc	513	.name = DRV_NAME,
669a5db4 JG	514	.id_table = cmd64x,
669a5db4 JG	515	.probe = cmd64x_init_one,
7f72a379	516	.remove = ata_pci_remove_one,
438ac6d5	517	#ifdef CONFIG_PM
7f72a379 AC	518	.suspend = ata_pci_device_suspend,
7f72a379 AC	519	.resume = cmd64x_reinit_one,
438ac6d5	520	#endif
669a5db4 JG	521	};
	522
	523	static int __init cmd64x_init(void)
	524	{
	525	return pci_register_driver(&cmd64x_pci_driver);
	526	}
	527
669a5db4 JG	528	static void __exit cmd64x_exit(void)
	529	{
	530	pci_unregister_driver(&cmd64x_pci_driver);
	531	}
	532
669a5db4 JG	533	MODULE_AUTHOR("Alan Cox");
	534	MODULE_DESCRIPTION("low-level driver for CMD64x series PATA controllers");
	535	MODULE_LICENSE("GPL");
	536	MODULE_DEVICE_TABLE(pci, cmd64x);
	537	MODULE_VERSION(DRV_VERSION);
	538
	539	module_init(cmd64x_init);
	540	module_exit(cmd64x_exit);