PATCH: add IT8212 driver including RAID mode support

PATCH: add IT8212 driver including RAID mode support

[Alan Cox]

Adds support for the IT8212 in pass through, smart and raid modes.


diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.8-rc3/drivers/ide/Kconfig linux-2.6.8-rc3/drivers/ide/Kconfig
--- linux.vanilla-2.6.8-rc3/drivers/ide/Kconfig	2004-08-09 15:51:00.000000000 +0100
+++ linux-2.6.8-rc3/drivers/ide/Kconfig	2004-08-09 19:49:32.000000000 +0100
@@ -621,6 +621,12 @@
 	  <http://www.ite.com.tw/ia/brief_it8172bsp.htm>; picture of the
 	  board at <http://www.mvista.com/partners/semiconductor/ite.html>.
 
+config BLK_DEV_IT8212
+	tristate "IT8212 IDE support"
+	help
+	  This driver adds support for the ITE 8212 IDE RAID controller in
+	  both RAID and pass-through mode. 
+
 config BLK_DEV_NS87415
 	tristate "NS87415 chipset support"
 	help
diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.8-rc3/drivers/ide/pci/it8212.c linux-2.6.8-rc3/drivers/ide/pci/it8212.c
--- linux.vanilla-2.6.8-rc3/drivers/ide/pci/it8212.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.8-rc3/drivers/ide/pci/it8212.c	2004-08-14 21:29:30.000000000 +0100
@@ -0,0 +1,802 @@
+/*
+ * linux/drivers/ide/pci/it8212.c		Version 0.02	August 2004
+ *
+ * Copyright (C) 2004		Red Hat <alan@redhat.com>
+ *
+ *  May be copied or modified under the terms of the GNU General Public License
+ *  Based in part on the ITE vendor provided SCSI driver.
+ *
+ *  Documentation available from
+ * 	http://www.ite.com.tw/pc/IT8212F_V04.pdf
+ *
+ *  The ITE8212 isn't exactly a standard IDE controller. It has two
+ *  modes. In pass through mode then it is an IDE controller. In its smart
+ *  mode its actually quite a capable hardware raid controller disguised
+ *  as an IDE controller.
+ *
+ *  Errata:
+ *  o	Rev 0x10 also requires master/slave use the same UDMA timing and
+ *	cannot do ATAPI DMA, while the other revisions can do ATAPI UDMA
+ *	but not MWDMA.
+ *  o	The identify data for raid volumes lacks CHS info (technically ok)
+ *	but also fails to set the LBA28 and other bits. We fix these in
+ *	the IDE probe quirk code.
+ *  o	If you write LBA48 sized I/O's (ie > 256 sector) in smart mode
+ *	raid then the controller firmware dies
+ *  o	If you send FLUSH_CACHE_EXT it seems to crash the controller in
+ *	smart mode (need to check if this is our bug)
+ *  o	WIN_READ_NATIVE_MAX_EXT errors for no apparent reason in smart
+ *	mode
+ *
+ *  This has a few impacts on the driver
+ *  - In pass through mode we do all the work you would expect
+ *  - In smart mode the clocking set up is done by the controller generally
+ *    but we must watch the other limits and filter.
+ *  - There are a few extra vendor commands that actually talk to the 
+ *    controller but only work PIO with no IRQ.
+ *
+ *  Vendor areas of the identify block in smart mode are used for the
+ *  timing and policy set up. Each HDD in raid mode also has a serial
+ *  block on the disk. The hardware extra commands are get/set chip status,
+ *  rebuild, get rebuild status.
+ *
+ *  In Linux the driver supports pass through mode as if the device was
+ *  just another IDE controller. If the smart mode is running then
+ *  volumes are managed by the controller firmware and each IDE "disk"
+ *  is a raid volume. Even more cute - the controller can do automated
+ *  hotplug and rebuild.
+ *
+ *  The pass through controller itself is a little demented. It has a
+ *  flaw that it has a single set of PIO/MWDMA timings per channel so
+ *  non UDMA devices restrict each others performance. It also has a 
+ *  single clock source per channel so mixed UDMA100/133 performance
+ *  isn't perfect and we have to pick a clock. Thankfully none of this
+ *  matters in smart mode. ATAPI DMA is not currently supported. 
+ *
+ *  Note that the "smart" controller mode does not support some
+ *  commands and cannot do SMART. Pass through mode can. In general it 
+ *  seems the smart mode is a win for RAID1/RAID10 but otherwise not.
+ *
+ *  TODO
+ *	-	Rev 0x10 in pass through mode needs UDMA clock whacking
+ *		to work around h/w issues
+ *	-	Is rev 0x10 out anywhere - test it if so
+ *	-	ATAPI UDMA is ok but not MWDMA it seems
+ *	-	RAID configuration ioctls
+ */
+ 
+#include <linux/config.h>
+#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>
+
+#include <asm/io.h>
+
+struct it8212_dev
+{
+	int	smart:1,		/* Are we in smart raid mode */
+		timing10:1;		/* Rev 0x10 */
+	u8	clock_mode;		/* 0, ATA_50 or ATA_66 */
+	u8	want[2][2];		/* Mode/Pri log for master slave */
+	/* We need these for switching the clock when DMA goes on/off 
+	   The high byte is the 66Mhz timing */
+	u16	pio[2];			/* Cached PIO values */
+	u16	mwdma[2];		/* Cached MWDMA values */
+	u16	udma[2];		/* Cached UDMA values (per drive) */
+};
+
+#define ATA_66		0
+#define ATA_50		1
+#define ATA_ANY		2
+
+#define UDMA_OFF	0
+#define MWDMA_OFF	0
+
+
+/**
+ *	it8212_program	-	program the PIO/MWDMA registers
+ *	@drive: drive to tune
+ *
+ *	Program the PIO/MWDMA timing for this channel according to the
+ *	current clock.
+ */
+ 
+static void it8212_program(ide_drive_t *drive, u16 timing)
+{
+	ide_hwif_t *hwif	= HWIF(drive);
+	struct it8212_dev *itdev = ide_get_hwifdata(hwif);
+	int channel = hwif->channel;
+	u8 conf;
+	
+	/* Program PIO/MWDMA timing bits */
+	if(itdev->clock_mode == ATA_66)
+		conf = timing >> 8;
+	else	
+		conf = timing & 0xFF;
+	pci_write_config_byte(hwif->pci_dev, 0x54 + 4 * channel, conf);
+}
+
+/**
+ *	it8212_program	-	program the PIO/MWDMA registers
+ *	@drive: drive to tune
+ *
+ *	Program the UDMA timing for this drive according to the
+ *	current clock.
+ */
+ 
+static void it8212_program_udma(ide_drive_t *drive, u16 timing)
+{
+	ide_hwif_t *hwif	= HWIF(drive);
+	struct it8212_dev *itdev = ide_get_hwifdata(hwif);
+	int channel = hwif->channel;
+	int unit = drive->select.b.unit;
+	u8 conf;
+	
+	/* Program UDMA timing bits */
+	if(itdev->clock_mode == ATA_66)
+		conf = timing >> 8;
+	else
+		conf = timing & 0xFF;
+	pci_write_config_byte(hwif->pci_dev, 0x56 + 4 * channel + unit, conf);
+}
+
+
+/**
+ *	it8212_clock_strategy
+ *	@hwif: hardware interface
+ *
+ *	Select between the 50 and 66Mhz base clocks to get the best
+ *	results for this interface.
+ */
+ 
+static void it8212_clock_strategy(ide_drive_t *drive)
+{
+	ide_hwif_t *hwif = HWIF(drive);
+	struct it8212_dev *itdev = ide_get_hwifdata(hwif);
+
+	u8 unit = drive->select.b.unit;
+	ide_drive_t *pair = &hwif->drives[1-unit];
+
+	int clock, altclock;
+	u8 v;
+	int sel = 0;
+
+	if(itdev->want[0][0] > itdev->want[1][0])
+	{
+		clock = itdev->want[0][1];
+		altclock = itdev->want[1][1];
+	}
+	else
+	{
+		clock = itdev->want[1][1];
+		altclock = itdev->want[0][1];
+	}
+
+	/* Master doesn't care does the slave ? */
+	if(clock == ATA_ANY)
+		clock = altclock;
+		
+	/* Nobody cares - keep the same clock */
+	if(clock == ATA_ANY)
+		return;
+	/* No change */
+	if(clock == itdev->clock_mode)
+		return;
+		
+	/* Load this into the controller ? */
+	if(clock == ATA_66)
+		itdev->clock_mode = ATA_66;
+	else
+	{
+		itdev->clock_mode = ATA_50;
+		sel = 1;
+	}
+	pci_read_config_byte(hwif->pci_dev, 0x50, &v);
+	v &= ~(1 << (1 + hwif->channel));
+	v |= sel << (1 + hwif->channel);
+	pci_write_config_byte(hwif->pci_dev, 0x50, v);
+	
+	/*
+	 *	Reprogram the UDMA/PIO of the pair drive for the switch
+	 *	MWDMA will be dealt with by the dma switcher
+	 */
+	if(pair && itdev->udma[1-unit] != UDMA_OFF)
+	{
+		it8212_program_udma(pair, itdev->udma[1-unit]);
+		it8212_program(pair, itdev->pio[1-unit]);
+	}
+	/*
+	 *	Reprogram the UDMA/PIO of our drive for the switch.
+	 *	MWDMA will be dealt with by the dma switcher
+	 */
+	if(itdev->udma[unit] != UDMA_OFF)
+	{
+		it8212_program_udma(drive, itdev->udma[unit]);
+		it8212_program(drive, itdev->pio[unit]);
+	}
+}
+
+/**
+ *	it8212_ratemask	-	Compute available modes
+ *	@drive: IDE drive
+ *
+ *	Compute the available speeds for the devices on the interface. This
+ *	is all modes to ATA133 clipped by drive cable setup.
+ */
+ 
+static byte it8212_ratemask (ide_drive_t *drive)
+{
+	u8 mode	= 4;
+	if (!eighty_ninty_three(drive))
+		mode = min(mode, (u8)1);
+	return mode;
+}
+
+/**
+ *	it8212_tuneproc	-	tune a drive 
+ *	@drive: drive to tune
+ *	@mode_wanted: the target operating mode
+ *
+ *	Load the timing settings for this device mode into the
+ *	controller. By the time we are called the mode has been 
+ *	modified as neccessary to handle the absence of seperate
+ *	master/slave timers for MWDMA/PIO.
+ *
+ *	This code is only used in pass through mode.
+ */
+ 
+static void it8212_tuneproc (ide_drive_t *drive, byte mode_wanted)
+{
+	ide_hwif_t *hwif	= HWIF(drive);
+	struct it8212_dev *itdev = ide_get_hwifdata(hwif);
+	int unit = drive->select.b.unit;
+	
+	/* Spec says 89 ref driver uses 88 */
+	static u16 pio[]	= { 0xAA88, 0xA382, 0xA181, 0x3332, 0x3121 };
+	static u8 pio_want[]    = { ATA_66, ATA_66, ATA_66, ATA_66, ATA_ANY };
+	
+	if(itdev->smart)
+		return;
+
+	/* We prefer 66Mhz clock for PIO 0-3, don't care for PIO4 */
+	itdev->want[unit][1] = pio_want[mode_wanted];
+	itdev->want[unit][0] = 1;	/* PIO is lowest priority */
+	itdev->pio[unit] = pio[mode_wanted];
+	it8212_clock_strategy(drive);
+	it8212_program(drive, itdev->pio[unit]);
+}
+
+/**
+ *	it8212_tune_mwdma	-	tune a channel for MWDMA
+ *	@drive: drive to set up
+ *	@mode_wanted: the target operating mode
+ *
+ *	Load the timing settings for this device mode into the
+ *	controller when doing MWDMA in pass through mode. The caller
+ *	must manage the whole lack of per device MWDMA/PIO timings and
+ *	the shared MWDMA/PIO timing register.
+ */
+ 
+static void it8212_tune_mwdma (ide_drive_t *drive, byte mode_wanted)
+{
+	ide_hwif_t *hwif	= HWIF(drive);
+	struct it8212_dev *itdev = (void *)ide_get_hwifdata(hwif);
+	int unit = drive->select.b.unit;
+	int channel = hwif->channel;
+	u8 conf;
+	
+	static u16 dma[]	= { 0x8866, 0x3222, 0x3121 };
+	static u8 mwdma_want[]	= { ATA_ANY, ATA_66, ATA_ANY };
+	
+	itdev->want[unit][1] = mwdma_want[mode_wanted];
+	itdev->want[unit][0] = 2;	/* MWDMA is low priority */
+	itdev->mwdma[unit] = dma[mode_wanted];
+	itdev->udma[unit] = UDMA_OFF;
+	
+	/* UDMA bits off */
+	pci_read_config_byte(hwif->pci_dev, 0x50, &conf);
+	conf |= 1 << (3 + 2 * channel + unit);
+	pci_write_config_byte(hwif->pci_dev, 0x50, conf);
+
+	it8212_clock_strategy(drive);
+	/* FIXME: do we need to program this ? */
+	/* it8212_program(drive, itdev->mwdma[unit]); */
+}
+
+/**
+ *	it8212_tune_udma	-	tune a channel for UDMA
+ *	@drive: drive to set up
+ *	@mode_wanted: the target operating mode
+ *
+ *	Load the timing settings for this device mode into the
+ *	controller when doing UDMA modes in pass through.
+ */
+ 
+static void it8212_tune_udma (ide_drive_t *drive, byte mode_wanted)
+{
+	ide_hwif_t *hwif	= HWIF(drive);
+	struct it8212_dev *itdev = ide_get_hwifdata(hwif);
+	int unit = drive->select.b.unit;
+	int channel = hwif->channel;
+	u8 conf;
+
+	static u16 udma[]	= { 0x4433, 0x4231, 0x3121, 0x2121, 0x1111, 0x2211, 0x1111 };
+	static u8 udma_want[]	= { ATA_ANY, ATA_50, ATA_ANY, ATA_66, ATA_66, ATA_50, ATA_66 };
+	
+	itdev->want[unit][1] = udma_want[mode_wanted];
+	itdev->want[unit][0] = 3;	/* UDMA is high priority */
+	itdev->mwdma[unit] = MWDMA_OFF;
+	itdev->udma[unit] = udma[mode_wanted];
+	if(mode_wanted >= 5)
+		itdev->udma[unit] |= 0x8080;	/* UDMA 5/6 select on */
+		
+	/* UDMA on */
+	pci_read_config_byte(hwif->pci_dev, 0x50, &conf);
+	conf &= ~ (1 << (3 + 2 * channel + unit));
+	pci_write_config_byte(hwif->pci_dev, 0x50, conf);
+
+	it8212_clock_strategy(drive);
+	it8212_program_udma(drive, itdev->udma[unit]);
+	
+}
+
+/**
+ *	config_it8212_chipset_for_pio	-	set drive timings
+ *	@drive: drive to tune
+ *	@speed we want
+ *
+ *	Compute the best pio mode we can for a given device. We must
+ *	pick a speed that does not cause problems with the other device
+ *	on the cable.
+ */
+ 
+static void config_it8212_chipset_for_pio (ide_drive_t *drive, byte set_speed)
+{
+	u8 unit = drive->select.b.unit;
+	ide_hwif_t *hwif = HWIF(drive);
+	ide_drive_t *pair = &hwif->drives[1-unit];
+	u8 speed = 0, set_pio	= ide_get_best_pio_mode(drive, 4, 5, NULL);
+	u8 pair_pio;
+	
+	/* We have to deal with this mess in pairs */
+	if(pair != NULL)
+	{
+		pair_pio = ide_get_best_pio_mode(pair, 4, 5, NULL);
+		/* Trim PIO to the slowest of the master/slave */
+		if(pair_pio < set_pio)
+			set_pio = pair_pio;
+	}
+	it8212_tuneproc(drive, set_pio);
+	speed = XFER_PIO_0 + set_pio;
+	/* XXX - We trim to the lowest of the pair so the other drive
+	   will always be fine at this point until we do hotplug passthru */
+	   
+	if (set_speed)
+		(void) ide_config_drive_speed(drive, speed);
+}
+
+static void config_chipset_for_pio (ide_drive_t *drive, byte set_speed)
+{
+	config_it8212_chipset_for_pio(drive, set_speed);
+}
+
+/**
+ *	it8212_dma_read	-	DMA hook
+ *	@drive: drive for DMA
+ *
+ *	The IT8212 has a single timing register for MWDMA and for PIO
+ *	operations. As we flip back and forth we have to reload the
+ *	clock.
+ *
+ *	FIXME: for 0x10 model we should reprogram UDMA here
+ */
+ 
+static int it8212_dma_begin(ide_drive_t *drive)
+{
+	ide_hwif_t *hwif = HWIF(drive);
+	struct it8212_dev *itdev = ide_get_hwifdata(hwif);
+	int unit = drive->select.b.unit;
+	if(itdev->mwdma[unit] != MWDMA_OFF)
+		it8212_program(drive, itdev->mwdma[unit]);
+	return __ide_dma_begin(drive);
+}
+
+/**
+ *	it8212_dma_write	-	DMA hook
+ *	@drive: drive for DMA stop
+ *
+ *	The IT8212 has a single timing register for MWDMA and for PIO
+ *	operations. As we flip back and forth we have to reload the
+ *	clock.
+ *
+ *	FIXME: for 0x10 model we should reprogram UDMA here
+ */
+ 
+static int it8212_dma_end(ide_drive_t *drive)
+{
+	ide_hwif_t *hwif = HWIF(drive);
+	int unit = drive->select.b.unit;
+	struct it8212_dev *itdev = ide_get_hwifdata(hwif);
+	int ret = __ide_dma_end(drive);
+	if(itdev->mwdma[unit] != MWDMA_OFF)
+		it8212_program(drive, itdev->pio[unit]);
+	return ret;
+}
+
+	
+/**
+ *	it8212_tune_chipset	-	set controller timings
+ *	@drive: Drive to set up
+ *	@xferspeed: speed we want to achieve
+ *
+ *	Tune the ITE chipset for the desired mode. If we can't achieve
+ *	the desired mode then tune for a lower one, but ultimately
+ *	make the thing work.
+ */
+ 
+static int it8212_tune_chipset (ide_drive_t *drive, byte xferspeed)
+{
+
+	ide_hwif_t *hwif	= HWIF(drive);
+	struct it8212_dev *itdev = ide_get_hwifdata(hwif);
+	u8 speed		= ide_rate_filter(it8212_ratemask(drive), xferspeed);
+				    
+	switch(speed) {
+		case XFER_PIO_4:
+		case XFER_PIO_3:
+		case XFER_PIO_2:
+		case XFER_PIO_1:
+		case XFER_PIO_0:
+			it8212_tuneproc(drive, (speed - XFER_PIO_0));
+			break;
+		/* MWDMA tuning is really hard because our MWDMA and PIO
+		   timings are kept in the same place. We can switch in the 
+		   host dma on/off callbacks */
+		case XFER_MW_DMA_2:
+		case XFER_MW_DMA_1:
+		case XFER_MW_DMA_0:
+			if(!itdev->smart)
+				it8212_tune_mwdma(drive, (speed - XFER_MW_DMA_0));
+			break;
+		case XFER_UDMA_6:
+		case XFER_UDMA_5:
+		case XFER_UDMA_4:
+		case XFER_UDMA_3:
+		case XFER_UDMA_2:
+		case XFER_UDMA_1:
+		case XFER_UDMA_0:
+			if(!itdev->smart)
+				it8212_tune_udma(drive, (speed - XFER_UDMA_0));
+			break;
+		default:
+			return 1;
+	}
+	/*
+	 *	In smart mode the clocking is done by the host controller
+	 * 	snooping the mode we picked. The rest of it is not our problem
+	 */
+	return (ide_config_drive_speed(drive, speed));
+}
+
+/**
+ *	config_chipset_for_dma	-	configure for DMA
+ *	@drive: drive to configure
+ *
+ *	Called by the IDE layer when it wants the timings set up.
+ */
+ 
+static int config_chipset_for_dma (ide_drive_t *drive)
+{
+	u8 speed	= ide_dma_speed(drive, it8212_ratemask(drive));
+
+	config_chipset_for_pio(drive, !speed);
+
+	if (!speed)
+		return 0;
+
+	if (ide_set_xfer_rate(drive, speed))
+		return 0;
+
+	if (!drive->init_speed)
+		drive->init_speed = speed;
+
+	return ide_dma_enable(drive);
+}
+
+/**
+ *	it8212_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
+ */
+ 
+static int it8212_config_drive_for_dma (ide_drive_t *drive)
+{
+	ide_hwif_t *hwif	= HWIF(drive);
+	struct hd_driveid *id	= drive->id;
+
+	if ((id->capability & 1) != 0 && drive->autodma) {
+		/* Consult the list of known "bad" drives */
+		if (__ide_dma_bad_drive(drive))
+			goto fast_ata_pio;
+
+		if ((id->field_valid & 4) && it8212_ratemask(drive)) {
+			if (id->dma_ultra & hwif->ultra_mask) {
+				/* Force if Capable UltraDMA */
+				int dma = config_chipset_for_dma(drive);
+				if ((id->field_valid & 2) && !dma)
+					goto try_dma_modes;
+			}
+		} else if (id->field_valid & 2) {
+try_dma_modes:
+			if ((id->dma_mword & hwif->mwdma_mask) ||
+			    (id->dma_1word & hwif->swdma_mask)) {
+				/* Force if Capable regular DMA modes */
+				if (!config_chipset_for_dma(drive))
+					goto no_dma_set;
+			}
+		} else if (__ide_dma_good_drive(drive) &&
+			   (id->eide_dma_time < 150)) {
+			/* Consult the list of known "good" drives */
+			if (!config_chipset_for_dma(drive))
+				goto no_dma_set;
+		} else {
+			goto fast_ata_pio;
+		}
+		return hwif->ide_dma_on(drive);
+	} else if ((id->capability & 8) || (id->field_valid & 2)) {
+fast_ata_pio:
+no_dma_set:
+		config_chipset_for_pio(drive, 1);
+		return hwif->ide_dma_off_quietly(drive);
+	}
+	/* IORDY not supported */
+	return 0;
+}
+
+/**
+ *	it8212_taskfile	-	command filter
+ *	@drive: drive to control
+ *	@args: taskfile
+ *	@buf: data
+ *
+ *	Intercept hook for the taskfile commands. We need this because
+ *	the IT8212 firmware seems to go castors up if it gets command
+ *	WIN_FLUSH_CACHE_EXT. It also lacks support for WIN_READ_NATIVE_MAX_EXT
+ *	it appears.
+ */
+ 
+static int it8212_taskfile(ide_drive_t *drive, ide_task_t *args, u8 *buf)
+{
+	task_struct_t *taskfile	= (task_struct_t *) args->tfRegister;
+	/* Issue a taskfile command */
+	switch(taskfile->command)
+	{
+		case WIN_READ_NATIVE_MAX_EXT:
+			return -EIO;
+		case WIN_FLUSH_CACHE_EXT:
+			taskfile->command = WIN_FLUSH_CACHE;
+			/* fall through */
+		default:
+			return ide_diag_taskfile(drive, args, 0, buf);
+	}	
+}
+
+/**
+ *	init_chipset_it8212	-	set up an ITE device
+ *	@dev: PCI device
+ *	@name: device name
+ *
+ *	PCI chipset level initialize. Nothing to do.
+ */
+
+static unsigned int __devinit init_chipset_it8212(struct pci_dev *dev, const char *name)
+{
+	return 0;
+}
+
+/**
+ *	ata66_it8212	-	check for 80 pin cable
+ *	@hwif: interface to check
+ *
+ *	Check for the presence of an ATA66 capable cable on the
+ *	interface. Problematic as it seems some cards don't have 
+ *	the needed logic onboard.
+ */
+
+static unsigned int __devinit ata66_it8212(ide_hwif_t *hwif)
+{
+	/* The reference driver also only does disk side */
+	return 1;
+}
+
+/**
+ *	it8212_memfree		-	free resources
+ *	@hwif: hwif to clean up
+ *
+ *	Called during the shutdown of an IDE interface at the later
+ *	stages so that we can clean up resources
+ */
+ 
+static void __devinit it8212_memfree(ide_hwif_t *hwif)
+{
+	void *p = ide_get_hwifdata(hwif);
+	ide_set_hwifdata(hwif, NULL);
+	kfree(p);
+}
+
+/**
+ *	init_hwif_it8212	-	set up hwif structs
+ *	@hwif: interface to set up
+ *
+ *	We do the basic set up of the interface structure. The IT8212
+ *	requires several custom handlers so we override the default
+ *	ide DMA handlers appropriately
+ */
+
+static void __devinit init_hwif_it8212(ide_hwif_t *hwif)
+{
+	struct it8212_dev *idev = kmalloc(sizeof(struct it8212_dev), GFP_KERNEL);
+	u8 conf;
+	static char *mode[2] = { "pass through", "smart" };
+
+	if(idev == NULL)
+	{
+		printk(KERN_ERR "it8212: out of memory, falling back to legacy behaviour.\n");
+		goto fallback;
+	}
+	memset(idev, 0, sizeof(*idev));
+	ide_set_hwifdata(hwif, idev);
+
+	hwif->remove = it8212_memfree;
+
+	pci_read_config_byte(hwif->pci_dev, 0x50, &conf);
+	if(conf & 1)
+	{
+		idev->smart = 1;
+		hwif->atapi_dma = 0;
+		hwif->raw_taskfile = it8212_taskfile;
+		/* Long I/O's although allowed in LBA48 space cause the
+		   onboard firmware to enter the twighlight zone */
+		hwif->rqsize = 256;
+	}
+
+	if(hwif->channel == 0)
+		printk(KERN_INFO "it8212: controller in %s mode.\n",
+			mode[idev->smart]);
+		
+	pci_read_config_byte(hwif->pci_dev, 0x50, &conf);
+	if (conf & (1 << (1 + hwif->channel)))
+		idev->clock_mode = ATA_50;
+	else
+		idev->clock_mode = ATA_66;
+		
+	idev->want[0][1] = ATA_ANY;
+	idev->want[1][1] = ATA_ANY;
+		
+	/*
+	 *	Not in the docs but according to the reference driver
+	 *	this is neccessary.
+	 */
+
+	pci_read_config_byte(hwif->pci_dev, 0x08, &conf);
+	if(conf == 0x10)
+	{
+		idev->timing10 = 1;
+		hwif->atapi_dma = 0;
+		if(!idev->smart)
+		{
+			printk(KERN_WARNING "it8212: DMA is not currently supported on revision 0x10 in pass through.\n");
+			goto fallback;
+		}
+	}
+		
+	hwif->speedproc = &it8212_tune_chipset;
+	hwif->tuneproc	= &it8212_tuneproc;
+	
+	/* MWDMA/PIO clock switching for pass through mode */
+	if(!idev->smart)
+	{
+		hwif->ide_dma_begin = &it8212_dma_begin;
+		hwif->ide_dma_end = &it8212_dma_end;
+	}
+
+	if (!hwif->dma_base)
+		goto fallback;
+
+	hwif->ultra_mask = 0x7f;
+	hwif->mwdma_mask = 0x07;
+	hwif->swdma_mask = 0x07;
+
+	hwif->ide_dma_check = &it8212_config_drive_for_dma;
+	if (!(hwif->udma_four))
+		hwif->udma_four = ata66_it8212(hwif);
+
+	/*
+	 *	The BIOS often doesn't set up DMA on this controller
+	 *	so we always do it.
+	 */
+
+	hwif->autodma = 1;
+	hwif->drives[0].autodma = hwif->autodma;
+	hwif->drives[1].autodma = hwif->autodma;
+	return;
+
+fallback:
+	hwif->autodma = 0;
+	hwif->drives[0].autotune = 1;
+	hwif->drives[1].autotune = 1;
+	return;
+}
+
+#define DECLARE_ITE_DEV(name_str)			\
+	{						\
+		.name		= name_str,		\
+		.init_chipset	= init_chipset_it8212,	\
+		.init_hwif	= init_hwif_it8212,	\
+		.channels	= 2,			\
+		.autodma	= AUTODMA,		\
+		.bootable	= ON_BOARD,		\
+	}
+
+static ide_pci_device_t it8212_chipsets[] __devinitdata = {
+	/* 0 */ DECLARE_ITE_DEV("IT8212"),
+};
+
+/**
+ *	it8212_init_one	-	pci layer discovery entry
+ *	@dev: PCI device
+ *	@id: ident table entry
+ *
+ *	Called by the PCI code when it finds an ITE8212 controller.
+ *	We then use the IDE PCI generic helper to do most of the work.
+ */
+ 
+static int __devinit it8212_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+	ide_setup_pci_device(dev, &it8212_chipsets[id->driver_data]);
+	return 0;
+}
+
+static void __devexit it8212_remove_one(struct pci_dev *dev)
+{
+	ide_pci_remove_hwifs(dev);
+}
+
+static struct pci_device_id it8212_pci_tbl[] = {
+	{ PCI_VENDOR_ID_ITE, PCI_DEVICE_ID_ITE_8212,  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+	{ 0, },
+};
+
+MODULE_DEVICE_TABLE(pci, it8212_pci_tbl);
+
+static struct pci_driver driver = {
+	.name		= "ITE8212 IDE",
+	.id_table	= it8212_pci_tbl,
+	.probe		= it8212_init_one,
+	.remove		= it8212_remove_one
+};
+
+static int it8212_ide_init(void)
+{
+	return ide_pci_register_driver(&driver);
+}
+
+static void it8212_ide_exit(void)
+{
+	ide_pci_unregister_driver(&driver);
+}
+
+module_init(it8212_ide_init);
+module_exit(it8212_ide_exit);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("PCI driver module for the ITE 8212");
+MODULE_LICENSE("GPL");
diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.8-rc3/drivers/ide/pci/Makefile linux-2.6.8-rc3/drivers/ide/pci/Makefile
--- linux.vanilla-2.6.8-rc3/drivers/ide/pci/Makefile	2004-08-09 15:51:00.000000000 +0100
+++ linux-2.6.8-rc3/drivers/ide/pci/Makefile	2004-08-09 19:51:50.000000000 +0100
@@ -13,6 +13,7 @@
 obj-$(CONFIG_BLK_DEV_HPT366)		+= hpt366.o
 #obj-$(CONFIG_BLK_DEV_HPT37X)		+= hpt37x.o
 obj-$(CONFIG_BLK_DEV_IT8172)		+= it8172.o
+obj-$(CONFIG_BLK_DEV_IT8212)		+= it8212.o
 obj-$(CONFIG_BLK_DEV_NS87415)		+= ns87415.o
 obj-$(CONFIG_BLK_DEV_OPTI621)		+= opti621.o
 obj-$(CONFIG_BLK_DEV_PDC202XX_OLD)	+= pdc202xx_old.o
diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.8-rc3/include/linux/pci_ids.h linux-2.6.8-rc3/include/linux/pci_ids.h
--- linux.vanilla-2.6.8-rc3/include/linux/pci_ids.h	2004-08-09 15:50:59.000000000 +0100
+++ linux-2.6.8-rc3/include/linux/pci_ids.h	2004-08-09 19:54:17.000000000 +0100
@@ -1638,6 +1638,7 @@
 #define PCI_VENDOR_ID_ITE		0x1283
 #define PCI_DEVICE_ID_ITE_IT8172G	0x8172
 #define PCI_DEVICE_ID_ITE_IT8172G_AUDIO 0x0801
+#define PCI_DEVICE_ID_ITE_8212		0x8212
 #define PCI_DEVICE_ID_ITE_8872		0x8872
 #define PCI_DEVICE_ID_ITE_IT8330G_0	0xe886
 

Signed-off-by: Alan Cox <alan@redhat.com>