drivers/ide/ppc/scc_pata.c

/*
 * Support for IDE interfaces on Celleb platform
 *
 * (C) Copyright 2006 TOSHIBA CORPORATION
 *
 * This code is based on drivers/ide/pci/siimage.c:
 * Copyright (C) 2001-2002	Andre Hedrick <andre@linux-ide.org>
 * Copyright (C) 2003		Red Hat <alan@redhat.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

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

#define PCI_DEVICE_ID_TOSHIBA_SCC_ATA            0x01b4

#define SCC_PATA_NAME           "scc IDE"

#define TDVHSEL_MASTER          0x00000001
#define TDVHSEL_SLAVE           0x00000004

#define MODE_JCUSFEN            0x00000080

#define CCKCTRL_ATARESET        0x00040000
#define CCKCTRL_BUFCNT          0x00020000
#define CCKCTRL_CRST            0x00010000
#define CCKCTRL_OCLKEN          0x00000100
#define CCKCTRL_ATACLKOEN       0x00000002
#define CCKCTRL_LCLKEN          0x00000001

#define QCHCD_IOS_SS		0x00000001

#define QCHSD_STPDIAG		0x00020000

#define INTMASK_MSK             0xD1000012
#define INTSTS_SERROR		0x80000000
#define INTSTS_PRERR		0x40000000
#define INTSTS_RERR		0x10000000
#define INTSTS_ICERR		0x01000000
#define INTSTS_BMSINT		0x00000010
#define INTSTS_BMHE		0x00000008
#define INTSTS_IOIRQS           0x00000004
#define INTSTS_INTRQ            0x00000002
#define INTSTS_ACTEINT          0x00000001

#define ECMODE_VALUE 0x01

static struct scc_ports {
	unsigned long ctl, dma;
	unsigned char hwif_id;  /* for removing hwif from system */
} scc_ports[MAX_HWIFS];

/* PIO transfer mode  table */
/* JCHST */
static unsigned long JCHSTtbl[2][7] = {
	{0x0E, 0x05, 0x02, 0x03, 0x02, 0x00, 0x00},   /* 100MHz */
	{0x13, 0x07, 0x04, 0x04, 0x03, 0x00, 0x00}    /* 133MHz */
};

/* JCHHT */
static unsigned long JCHHTtbl[2][7] = {
	{0x0E, 0x02, 0x02, 0x02, 0x02, 0x00, 0x00},   /* 100MHz */
	{0x13, 0x03, 0x03, 0x03, 0x03, 0x00, 0x00}    /* 133MHz */
};

/* JCHCT */
static unsigned long JCHCTtbl[2][7] = {
	{0x1D, 0x1D, 0x1C, 0x0B, 0x06, 0x00, 0x00},   /* 100MHz */
	{0x27, 0x26, 0x26, 0x0E, 0x09, 0x00, 0x00}    /* 133MHz */
};


/* DMA transfer mode  table */
/* JCHDCTM/JCHDCTS */
static unsigned long JCHDCTxtbl[2][7] = {
	{0x0A, 0x06, 0x04, 0x03, 0x01, 0x00, 0x00},   /* 100MHz */
	{0x0E, 0x09, 0x06, 0x04, 0x02, 0x01, 0x00}    /* 133MHz */
};

/* JCSTWTM/JCSTWTS  */
static unsigned long JCSTWTxtbl[2][7] = {
	{0x06, 0x04, 0x03, 0x02, 0x02, 0x02, 0x00},   /* 100MHz */
	{0x09, 0x06, 0x04, 0x02, 0x02, 0x02, 0x02}    /* 133MHz */
};

/* JCTSS */
static unsigned long JCTSStbl[2][7] = {
	{0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x00},   /* 100MHz */
	{0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05}    /* 133MHz */
};

/* JCENVT */
static unsigned long JCENVTtbl[2][7] = {
	{0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00},   /* 100MHz */
	{0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02}    /* 133MHz */
};

/* JCACTSELS/JCACTSELM */
static unsigned long JCACTSELtbl[2][7] = {
	{0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x00},   /* 100MHz */
	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}    /* 133MHz */
};


static u8 scc_ide_inb(unsigned long port)
{
	u32 data = in_be32((void*)port);
	return (u8)data;
}

static u16 scc_ide_inw(unsigned long port)
{
	u32 data = in_be32((void*)port);
	return (u16)data;
}

static void scc_ide_insw(unsigned long port, void *addr, u32 count)
{
	u16 *ptr = (u16 *)addr;
	while (count--) {
		*ptr++ = le16_to_cpu(in_be32((void*)port));
	}
}

static void scc_ide_insl(unsigned long port, void *addr, u32 count)
{
	u16 *ptr = (u16 *)addr;
	while (count--) {
		*ptr++ = le16_to_cpu(in_be32((void*)port));
		*ptr++ = le16_to_cpu(in_be32((void*)port));
	}
}

static void scc_ide_outb(u8 addr, unsigned long port)
{
	out_be32((void*)port, addr);
}

static void scc_ide_outw(u16 addr, unsigned long port)
{
	out_be32((void*)port, addr);
}

static void
scc_ide_outbsync(ide_drive_t * drive, u8 addr, unsigned long port)
{
	ide_hwif_t *hwif = HWIF(drive);

	out_be32((void*)port, addr);
	__asm__ __volatile__("eieio":::"memory");
	in_be32((void*)(hwif->dma_base + 0x01c));
	__asm__ __volatile__("eieio":::"memory");
}

static void
scc_ide_outsw(unsigned long port, void *addr, u32 count)
{
	u16 *ptr = (u16 *)addr;
	while (count--) {
		out_be32((void*)port, cpu_to_le16(*ptr++));
	}
}

static void
scc_ide_outsl(unsigned long port, void *addr, u32 count)
{
	u16 *ptr = (u16 *)addr;
	while (count--) {
		out_be32((void*)port, cpu_to_le16(*ptr++));
		out_be32((void*)port, cpu_to_le16(*ptr++));
	}
}

/**
 *	scc_ratemask	-	Compute available modes
 *	@drive: IDE drive
 *
 *	Compute the available speeds for the devices on the interface.
 *	Enforce UDMA33 as a limit if there is no 80pin cable present.
 */

static u8 scc_ratemask(ide_drive_t *drive)
{
	u8 mode = 4;

	if (!eighty_ninty_three(drive))
		mode = min(mode, (u8)1);
	return mode;
}

/**
 *	scc_tuneproc	-	tune a drive PIO mode
 *	@drive: drive to tune
 *	@mode_wanted: the target operating mode
 *
 *	Load the timing settings for this device mode into the
 *	controller.
 */

static void scc_tuneproc(ide_drive_t *drive, byte mode_wanted)
{
	ide_hwif_t *hwif = HWIF(drive);
	struct scc_ports *ports = ide_get_hwifdata(hwif);
	unsigned long ctl_base = ports->ctl;
	unsigned long cckctrl_port = ctl_base + 0xff0;
	unsigned long piosht_port = ctl_base + 0x000;
	unsigned long pioct_port = ctl_base + 0x004;
	unsigned long reg;
	unsigned char speed = XFER_PIO_0;
	int offset;

	mode_wanted = ide_get_best_pio_mode(drive, mode_wanted, 4, NULL);
	switch (mode_wanted) {
	case 4:
		speed = XFER_PIO_4;
		break;
	case 3:
		speed = XFER_PIO_3;
		break;
	case 2:
		speed = XFER_PIO_2;
		break;
	case 1:
		speed = XFER_PIO_1;
		break;
	case 0:
	default:
		speed = XFER_PIO_0;
		break;
	}

	reg = in_be32((void __iomem *)cckctrl_port);
	if (reg & CCKCTRL_ATACLKOEN) {
		offset = 1; /* 133MHz */
	} else {
		offset = 0; /* 100MHz */
	}
	reg = JCHSTtbl[offset][mode_wanted] << 16 | JCHHTtbl[offset][mode_wanted];
	out_be32((void __iomem *)piosht_port, reg);
	reg = JCHCTtbl[offset][mode_wanted];
	out_be32((void __iomem *)pioct_port, reg);

	ide_config_drive_speed(drive, speed);
}

/**
 *	scc_tune_chipset	-	tune a drive DMA mode
 *	@drive: Drive to set up
 *	@xferspeed: speed we want to achieve
 *
 *	Load the timing settings for this device mode into the
 *	controller.
 */

static int scc_tune_chipset(ide_drive_t *drive, byte xferspeed)
{
	ide_hwif_t *hwif = HWIF(drive);
	u8 speed = ide_rate_filter(scc_ratemask(drive), xferspeed);
	struct scc_ports *ports = ide_get_hwifdata(hwif);
	unsigned long ctl_base = ports->ctl;
	unsigned long cckctrl_port = ctl_base + 0xff0;
	unsigned long mdmact_port = ctl_base + 0x008;
	unsigned long mcrcst_port = ctl_base + 0x00c;
	unsigned long sdmact_port = ctl_base + 0x010;
	unsigned long scrcst_port = ctl_base + 0x014;
	unsigned long udenvt_port = ctl_base + 0x018;
	unsigned long tdvhsel_port   = ctl_base + 0x020;
	int is_slave = (&hwif->drives[1] == drive);
	int offset, idx;
	unsigned long reg;
	unsigned long jcactsel;

	reg = in_be32((void __iomem *)cckctrl_port);
	if (reg & CCKCTRL_ATACLKOEN) {
		offset = 1; /* 133MHz */
	} else {
		offset = 0; /* 100MHz */
	}

	switch (speed) {
	case XFER_UDMA_6:
		idx = 6;
		break;
	case XFER_UDMA_5:
		idx = 5;
		break;
	case XFER_UDMA_4:
		idx = 4;
		break;
	case XFER_UDMA_3:
		idx = 3;
		break;
	case XFER_UDMA_2:
		idx = 2;
		break;
	case XFER_UDMA_1:
		idx = 1;
		break;
	case XFER_UDMA_0:
		idx = 0;
		break;
	default:
		return 1;
	}

	jcactsel = JCACTSELtbl[offset][idx];
	if (is_slave) {
		out_be32((void __iomem *)sdmact_port, JCHDCTxtbl[offset][idx]);
		out_be32((void __iomem *)scrcst_port, JCSTWTxtbl[offset][idx]);
		jcactsel = jcactsel << 2;
		out_be32((void __iomem *)tdvhsel_port, (in_be32((void __iomem *)tdvhsel_port) & ~TDVHSEL_SLAVE) | jcactsel);
	} else {
		out_be32((void __iomem *)mdmact_port, JCHDCTxtbl[offset][idx]);
		out_be32((void __iomem *)mcrcst_port, JCSTWTxtbl[offset][idx]);
		out_be32((void __iomem *)tdvhsel_port, (in_be32((void __iomem *)tdvhsel_port) & ~TDVHSEL_MASTER) | jcactsel);
	}
	reg = JCTSStbl[offset][idx] << 16 | JCENVTtbl[offset][idx];
	out_be32((void __iomem *)udenvt_port, reg);

	return ide_config_drive_speed(drive, speed);
}

/**
 *	scc_config_chipset_for_dma	-	configure for DMA
 *	@drive: drive to configure
 *
 *	Called by scc_config_drive_for_dma().
 */

static int scc_config_chipset_for_dma(ide_drive_t *drive)
{
	u8 speed = ide_dma_speed(drive, scc_ratemask(drive));

	if (!speed)
		return 0;

	if (scc_tune_chipset(drive, speed))
		return 0;

	return ide_dma_enable(drive);
}

/**
 *	scc_configure_drive_for_dma	-	set up for DMA transfers
 *	@drive: drive we are going to set up
 *
 *	Set up the drive for DMA, tune the controller and drive as
 *	required.
 *      If the drive isn't suitable for DMA or we hit other problems
 *      then we will drop down to PIO and set up PIO appropriately.
 *      (return 1)
 */

static int scc_config_drive_for_dma(ide_drive_t *drive)
{
	if (ide_use_dma(drive) && scc_config_chipset_for_dma(drive))
		return 0;

	if (ide_use_fast_pio(drive))
		scc_tuneproc(drive, 4);

	return -1;
}

/**
 *	scc_ide_dma_setup	-	begin a DMA phase
 *	@drive: target device
 *
 *	Build an IDE DMA PRD (IDE speak for scatter gather table)
 *	and then set up the DMA transfer registers.
 *
 *	Returns 0 on success. If a PIO fallback is required then 1
 *	is returned.
 */

static int scc_dma_setup(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	struct request *rq = HWGROUP(drive)->rq;
	unsigned int reading;
	u8 dma_stat;

	if (rq_data_dir(rq))
		reading = 0;
	else
		reading = 1 << 3;

	/* fall back to pio! */
	if (!ide_build_dmatable(drive, rq)) {
		ide_map_sg(drive, rq);
		return 1;
	}

	/* PRD table */
	out_be32((void __iomem *)hwif->dma_prdtable, hwif->dmatable_dma);

	/* specify r/w */
	out_be32((void __iomem *)hwif->dma_command, reading);

	/* read dma_status for INTR & ERROR flags */
	dma_stat = in_be32((void __iomem *)hwif->dma_status);

	/* clear INTR & ERROR flags */
	out_be32((void __iomem *)hwif->dma_status, dma_stat|6);
	drive->waiting_for_dma = 1;
	return 0;
}


/**
 *	scc_ide_dma_end	-	Stop DMA
 *	@drive: IDE drive
 *
 *	Check and clear INT Status register.
 *      Then call __ide_dma_end().
 */

static int scc_ide_dma_end(ide_drive_t * drive)
{
	ide_hwif_t *hwif = HWIF(drive);
	unsigned long intsts_port = hwif->dma_base + 0x014;
	u32 reg;

	while (1) {
		reg = in_be32((void __iomem *)intsts_port);

		if (reg & INTSTS_SERROR) {
			printk(KERN_WARNING "%s: SERROR\n", SCC_PATA_NAME);
			out_be32((void __iomem *)intsts_port, INTSTS_SERROR|INTSTS_BMSINT);

			out_be32((void __iomem *)hwif->dma_command, in_be32((void __iomem *)hwif->dma_command) & ~QCHCD_IOS_SS);
			continue;
		}

		if (reg & INTSTS_PRERR) {
			u32 maea0, maec0;
			unsigned long ctl_base = hwif->config_data;

			maea0 = in_be32((void __iomem *)(ctl_base + 0xF50));
			maec0 = in_be32((void __iomem *)(ctl_base + 0xF54));

			printk(KERN_WARNING "%s: PRERR [addr:%x cmd:%x]\n", SCC_PATA_NAME, maea0, maec0);

			out_be32((void __iomem *)intsts_port, INTSTS_PRERR|INTSTS_BMSINT);

			out_be32((void __iomem *)hwif->dma_command, in_be32((void __iomem *)hwif->dma_command) & ~QCHCD_IOS_SS);
			continue;
		}

		if (reg & INTSTS_RERR) {
			printk(KERN_WARNING "%s: Response Error\n", SCC_PATA_NAME);
			out_be32((void __iomem *)intsts_port, INTSTS_RERR|INTSTS_BMSINT);

			out_be32((void __iomem *)hwif->dma_command, in_be32((void __iomem *)hwif->dma_command) & ~QCHCD_IOS_SS);
			continue;
		}

		if (reg & INTSTS_ICERR) {
			out_be32((void __iomem *)hwif->dma_command, in_be32((void __iomem *)hwif->dma_command) & ~QCHCD_IOS_SS);

			printk(KERN_WARNING "%s: Illegal Configuration\n", SCC_PATA_NAME);
			out_be32((void __iomem *)intsts_port, INTSTS_ICERR|INTSTS_BMSINT);
			continue;
		}

		if (reg & INTSTS_BMSINT) {
			printk(KERN_WARNING "%s: Internal Bus Error\n", SCC_PATA_NAME);
			out_be32((void __iomem *)intsts_port, INTSTS_BMSINT);

			ide_do_reset(drive);
			continue;
		}

		if (reg & INTSTS_BMHE) {
			out_be32((void __iomem *)intsts_port, INTSTS_BMHE);
			continue;
		}

		if (reg & INTSTS_ACTEINT) {
			out_be32((void __iomem *)intsts_port, INTSTS_ACTEINT);
			continue;
		}

		if (reg & INTSTS_IOIRQS) {
			out_be32((void __iomem *)intsts_port, INTSTS_IOIRQS);
			continue;
		}
		break;
	}

	return __ide_dma_end(drive);
}

/* returns 1 if dma irq issued, 0 otherwise */
static int scc_dma_test_irq(ide_drive_t *drive)
{
	ide_hwif_t *hwif	= HWIF(drive);
	u8 dma_stat		= hwif->INB(hwif->dma_status);

	/* return 1 if INTR asserted */
	if ((dma_stat & 4) == 4)
		return 1;

	/* Workaround for PTERADD: emulate DMA_INTR when
	 * - IDE_STATUS[ERR] = 1
	 * - INT_STATUS[INTRQ] = 1
	 * - DMA_STATUS[IORACTA] = 1
	 */
	if (in_be32((void __iomem *)IDE_ALTSTATUS_REG) & ERR_STAT &&
	    in_be32((void __iomem *)(hwif->dma_base + 0x014)) & INTSTS_INTRQ &&
		dma_stat & 1)
		return 1;

	if (!drive->waiting_for_dma)
		printk(KERN_WARNING "%s: (%s) called while not waiting\n",
			drive->name, __FUNCTION__);
	return 0;
}

/**
 *	setup_mmio_scc	-	map CTRL/BMID region
 *	@dev: PCI device we are configuring
 *	@name: device name
 *
 */

static int setup_mmio_scc (struct pci_dev *dev, const char *name)
{
	unsigned long ctl_base = pci_resource_start(dev, 0);
	unsigned long dma_base = pci_resource_start(dev, 1);
	unsigned long ctl_size = pci_resource_len(dev, 0);
	unsigned long dma_size = pci_resource_len(dev, 1);
	void *ctl_addr;
	void *dma_addr;
	int i;

	for (i = 0; i < MAX_HWIFS; i++) {
		if (scc_ports[i].ctl == 0)
			break;
	}
	if (i >= MAX_HWIFS)
		return -ENOMEM;

	if (!request_mem_region(ctl_base, ctl_size, name)) {
		printk(KERN_WARNING "%s: IDE controller MMIO ports not available.\n", SCC_PATA_NAME);
		goto fail_0;
	}

	if (!request_mem_region(dma_base, dma_size, name)) {
		printk(KERN_WARNING "%s: IDE controller MMIO ports not available.\n", SCC_PATA_NAME);
		goto fail_1;
	}

	if ((ctl_addr = ioremap(ctl_base, ctl_size)) == NULL)
		goto fail_2;

	if ((dma_addr = ioremap(dma_base, dma_size)) == NULL)
		goto fail_3;

	pci_set_master(dev);
	scc_ports[i].ctl = (unsigned long)ctl_addr;
	scc_ports[i].dma = (unsigned long)dma_addr;
	pci_set_drvdata(dev, (void *) &scc_ports[i]);

	return 1;

 fail_3:
	iounmap(ctl_addr);
 fail_2:
	release_mem_region(dma_base, dma_size);
 fail_1:
	release_mem_region(ctl_base, ctl_size);
 fail_0:
	return -ENOMEM;
}

/**
 *	init_setup_scc	-	set up an SCC PATA Controller
 *	@dev: PCI device
 *	@d: IDE PCI device
 *
 *	Perform the initial set up for this device.
 */

static int __devinit init_setup_scc(struct pci_dev *dev, ide_pci_device_t *d)
{
	unsigned long ctl_base;
	unsigned long dma_base;
	unsigned long cckctrl_port;
	unsigned long intmask_port;
	unsigned long mode_port;
	unsigned long ecmode_port;
	unsigned long dma_status_port;
	u32 reg = 0;
	struct scc_ports *ports;
	int rc;

	rc = setup_mmio_scc(dev, d->name);
	if (rc < 0) {
		return rc;
	}

	ports = pci_get_drvdata(dev);
	ctl_base = ports->ctl;
	dma_base = ports->dma;
	cckctrl_port = ctl_base + 0xff0;
	intmask_port = dma_base + 0x010;
	mode_port = ctl_base + 0x024;
	ecmode_port = ctl_base + 0xf00;
	dma_status_port = dma_base + 0x004;

	/* controller initialization */
	reg = 0;
	out_be32((void*)cckctrl_port, reg);
	reg |= CCKCTRL_ATACLKOEN;
	out_be32((void*)cckctrl_port, reg);
	reg |= CCKCTRL_LCLKEN | CCKCTRL_OCLKEN;
	out_be32((void*)cckctrl_port, reg);
	reg |= CCKCTRL_CRST;
	out_be32((void*)cckctrl_port, reg);

	for (;;) {
		reg = in_be32((void*)cckctrl_port);
		if (reg & CCKCTRL_CRST)
			break;
		udelay(5000);
	}

	reg |= CCKCTRL_ATARESET;
	out_be32((void*)cckctrl_port, reg);

	out_be32((void*)ecmode_port, ECMODE_VALUE);
	out_be32((void*)mode_port, MODE_JCUSFEN);
	out_be32((void*)intmask_port, INTMASK_MSK);

	return ide_setup_pci_device(dev, d);
}

/**
 *	init_mmio_iops_scc	-	set up the iops for MMIO
 *	@hwif: interface to set up
 *
 */

static void __devinit init_mmio_iops_scc(ide_hwif_t *hwif)
{
	struct pci_dev *dev = hwif->pci_dev;
	struct scc_ports *ports = pci_get_drvdata(dev);
	unsigned long dma_base = ports->dma;

	ide_set_hwifdata(hwif, ports);

	hwif->INB = scc_ide_inb;
	hwif->INW = scc_ide_inw;
	hwif->INSW = scc_ide_insw;
	hwif->INSL = scc_ide_insl;
	hwif->OUTB = scc_ide_outb;
	hwif->OUTBSYNC = scc_ide_outbsync;
	hwif->OUTW = scc_ide_outw;
	hwif->OUTSW = scc_ide_outsw;
	hwif->OUTSL = scc_ide_outsl;

	hwif->io_ports[IDE_DATA_OFFSET] = dma_base + 0x20;
	hwif->io_ports[IDE_ERROR_OFFSET] = dma_base + 0x24;
	hwif->io_ports[IDE_NSECTOR_OFFSET] = dma_base + 0x28;
	hwif->io_ports[IDE_SECTOR_OFFSET] = dma_base + 0x2c;
	hwif->io_ports[IDE_LCYL_OFFSET] = dma_base + 0x30;
	hwif->io_ports[IDE_HCYL_OFFSET] = dma_base + 0x34;
	hwif->io_ports[IDE_SELECT_OFFSET] = dma_base + 0x38;
	hwif->io_ports[IDE_STATUS_OFFSET] = dma_base + 0x3c;
	hwif->io_ports[IDE_CONTROL_OFFSET] = dma_base + 0x40;

	hwif->irq = hwif->pci_dev->irq;
	hwif->dma_base = dma_base;
	hwif->config_data = ports->ctl;
	hwif->mmio = 1;
}

/**
 *	init_iops_scc	-	set up iops
 *	@hwif: interface to set up
 *
 *	Do the basic setup for the SCC hardware interface
 *	and then do the MMIO setup.
 */

static void __devinit init_iops_scc(ide_hwif_t *hwif)
{
	struct pci_dev *dev =  hwif->pci_dev;
	hwif->hwif_data = NULL;
	if (pci_get_drvdata(dev) == NULL)
		return;
	init_mmio_iops_scc(hwif);
}

/**
 *	init_hwif_scc	-	set up hwif
 *	@hwif: interface to set up
 *
 *	We do the basic set up of the interface structure. The SCC
 *	requires several custom handlers so we override the default
 *	ide DMA handlers appropriately.
 */

static void __devinit init_hwif_scc(ide_hwif_t *hwif)
{
	struct scc_ports *ports = ide_get_hwifdata(hwif);

	ports->hwif_id = hwif->index;

	hwif->dma_command = hwif->dma_base;
	hwif->dma_status = hwif->dma_base + 0x04;
	hwif->dma_prdtable = hwif->dma_base + 0x08;

	/* PTERADD */
	out_be32((void __iomem *)(hwif->dma_base + 0x018), hwif->dmatable_dma);

	hwif->dma_setup = scc_dma_setup;
	hwif->ide_dma_end = scc_ide_dma_end;
	hwif->speedproc = scc_tune_chipset;
	hwif->tuneproc = scc_tuneproc;
	hwif->ide_dma_check = scc_config_drive_for_dma;
	hwif->ide_dma_test_irq = scc_dma_test_irq;

	hwif->drives[0].autotune = IDE_TUNE_AUTO;
	hwif->drives[1].autotune = IDE_TUNE_AUTO;

	if (in_be32((void __iomem *)(hwif->config_data + 0xff0)) & CCKCTRL_ATACLKOEN) {
		hwif->ultra_mask = 0x7f; /* 133MHz */
	} else {
		hwif->ultra_mask = 0x3f; /* 100MHz */
	}
	hwif->mwdma_mask = 0x00;
	hwif->swdma_mask = 0x00;
	hwif->atapi_dma = 1;

	/* we support 80c cable only. */
	hwif->udma_four = 1;

	hwif->autodma = 0;
	if (!noautodma)
		hwif->autodma = 1;
	hwif->drives[0].autodma = hwif->autodma;
	hwif->drives[1].autodma = hwif->autodma;
}

#define DECLARE_SCC_DEV(name_str)			\
  {							\
      .name		= name_str,			\
      .init_setup	= init_setup_scc,		\
      .init_iops	= init_iops_scc,		\
      .init_hwif	= init_hwif_scc,		\
      .channels	= 1,					\
      .autodma	= AUTODMA,				\
      .bootable	= ON_BOARD,				\
  }

static ide_pci_device_t scc_chipsets[] __devinitdata = {
	/* 0 */ DECLARE_SCC_DEV("sccIDE"),
};

/**
 *	scc_init_one	-	pci layer discovery entry
 *	@dev: PCI device
 *	@id: ident table entry
 *
 *	Called by the PCI code when it finds an SCC PATA controller.
 *	We then use the IDE PCI generic helper to do most of the work.
 */

static int __devinit scc_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
	ide_pci_device_t *d = &scc_chipsets[id->driver_data];
	return d->init_setup(dev, d);
}

/**
 *	scc_remove	-	pci layer remove entry
 *	@dev: PCI device
 *
 *	Called by the PCI code when it removes an SCC PATA controller.
 */

static void __devexit scc_remove(struct pci_dev *dev)
{
	struct scc_ports *ports = pci_get_drvdata(dev);
	ide_hwif_t *hwif = &ide_hwifs[ports->hwif_id];
	unsigned long ctl_base = pci_resource_start(dev, 0);
	unsigned long dma_base = pci_resource_start(dev, 1);
	unsigned long ctl_size = pci_resource_len(dev, 0);
	unsigned long dma_size = pci_resource_len(dev, 1);

	if (hwif->dmatable_cpu) {
		pci_free_consistent(hwif->pci_dev,
				    PRD_ENTRIES * PRD_BYTES,
				    hwif->dmatable_cpu,
				    hwif->dmatable_dma);
		hwif->dmatable_cpu = NULL;
	}

	ide_unregister(hwif->index);

	hwif->chipset = ide_unknown;
	iounmap((void*)ports->dma);
	iounmap((void*)ports->ctl);
	release_mem_region(dma_base, dma_size);
	release_mem_region(ctl_base, ctl_size);
	memset(ports, 0, sizeof(*ports));
}

static struct pci_device_id scc_pci_tbl[] = {
	{ PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_SCC_ATA,  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{ 0, },
};
MODULE_DEVICE_TABLE(pci, scc_pci_tbl);

static struct pci_driver driver = {
	.name = "SCC IDE",
	.id_table = scc_pci_tbl,
	.probe = scc_init_one,
	.remove = scc_remove,
};

static int scc_ide_init(void)
{
	return ide_pci_register_driver(&driver);
}

module_init(scc_ide_init);
/* -- No exit code?
static void scc_ide_exit(void)
{
	ide_pci_unregister_driver(&driver);
}
module_exit(scc_ide_exit);
 */


MODULE_DESCRIPTION("PCI driver module for Toshiba SCC IDE");
MODULE_LICENSE("GPL");