// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Support for IDE interfaces on PowerMacs.
 *
 * These IDE interfaces are memory-mapped and have a DBDMA channel
 * for doing DMA.
 *
 *  Copyright (C) 1998-2003 Paul Mackerras & Ben. Herrenschmidt
 *  Copyright (C) 2007-2008 Bartlomiej Zolnierkiewicz
 *
 * Some code taken from drivers/ide/ide-dma.c:
 *
 *  Copyright (c) 1995-1998  Mark Lord
 *
 * TODO: - Use pre-calculated (kauai) timing tables all the time and
 * get rid of the "rounded" tables used previously, so we have the
 * same table format for all controllers and can then just have one
 * big table
 */
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/ide.h>
#include <linux/notifier.h>
#include <linux/module.h>
#include <linux/reboot.h>
#include <linux/pci.h>
#include <linux/adb.h>
#include <linux/pmu.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>

#include <asm/prom.h>
#include <asm/io.h>
#include <asm/dbdma.h>
#include <asm/ide.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/sections.h>
#include <asm/irq.h>
#include <asm/mediabay.h>

#define DRV_NAME "ide-pmac"

#undef IDE_PMAC_DEBUG

#define DMA_WAIT_TIMEOUT	50

typedef struct pmac_ide_hwif {
	unsigned long			regbase;
	int				irq;
	int				kind;
	int				aapl_bus_id;
	unsigned			broken_dma : 1;
	unsigned			broken_dma_warn : 1;
	struct device_node*		node;
	struct macio_dev		*mdev;
	u32				timings[4];
	volatile u32 __iomem *		*kauai_fcr;
	ide_hwif_t			*hwif;

	/* Those fields are duplicating what is in hwif. We currently
	 * can't use the hwif ones because of some assumptions that are
	 * beeing done by the generic code about the kind of dma controller
	 * and format of the dma table. This will have to be fixed though.
	 */
	volatile struct dbdma_regs __iomem *	dma_regs;
	struct dbdma_cmd*		dma_table_cpu;
} pmac_ide_hwif_t;

enum {
	controller_ohare,	/* OHare based */
	controller_heathrow,	/* Heathrow/Paddington */
	controller_kl_ata3,	/* KeyLargo ATA-3 */
	controller_kl_ata4,	/* KeyLargo ATA-4 */
	controller_un_ata6,	/* UniNorth2 ATA-6 */
	controller_k2_ata6,	/* K2 ATA-6 */
	controller_sh_ata6,	/* Shasta ATA-6 */
};

static const char* model_name[] = {
	"OHare ATA",		/* OHare based */
	"Heathrow ATA",		/* Heathrow/Paddington */
	"KeyLargo ATA-3",	/* KeyLargo ATA-3 (MDMA only) */
	"KeyLargo ATA-4",	/* KeyLargo ATA-4 (UDMA/66) */
	"UniNorth ATA-6",	/* UniNorth2 ATA-6 (UDMA/100) */
	"K2 ATA-6",		/* K2 ATA-6 (UDMA/100) */
	"Shasta ATA-6",		/* Shasta ATA-6 (UDMA/133) */
};

/*
 * Extra registers, both 32-bit little-endian
 */
#define IDE_TIMING_CONFIG	0x200
#define IDE_INTERRUPT		0x300

/* Kauai (U2) ATA has different register setup */
#define IDE_KAUAI_PIO_CONFIG	0x200
#define IDE_KAUAI_ULTRA_CONFIG	0x210
#define IDE_KAUAI_POLL_CONFIG	0x220

/*
 * Timing configuration register definitions
 */

/* Number of IDE_SYSCLK_NS ticks, argument is in nanoseconds */
#define SYSCLK_TICKS(t)		(((t) + IDE_SYSCLK_NS - 1) / IDE_SYSCLK_NS)
#define SYSCLK_TICKS_66(t)	(((t) + IDE_SYSCLK_66_NS - 1) / IDE_SYSCLK_66_NS)
#define IDE_SYSCLK_NS		30	/* 33Mhz cell */
#define IDE_SYSCLK_66_NS	15	/* 66Mhz cell */

/* 133Mhz cell, found in shasta.
 * See comments about 100 Mhz Uninorth 2...
 * Note that PIO_MASK and MDMA_MASK seem to overlap
 */
#define TR_133_PIOREG_PIO_MASK		0xff000fff
#define TR_133_PIOREG_MDMA_MASK		0x00fff800
#define TR_133_UDMAREG_UDMA_MASK	0x0003ffff
#define TR_133_UDMAREG_UDMA_EN		0x00000001

/* 100Mhz cell, found in Uninorth 2. I don't have much infos about
 * this one yet, it appears as a pci device (106b/0033) on uninorth
 * internal PCI bus and it's clock is controlled like gem or fw. It
 * appears to be an evolution of keylargo ATA4 with a timing register
 * extended to 2 32bits registers and a similar DBDMA channel. Other
 * registers seem to exist but I can't tell much about them.
 * 
 * So far, I'm using pre-calculated tables for this extracted from
 * the values used by the MacOS X driver.
 * 
 * The "PIO" register controls PIO and MDMA timings, the "ULTRA"
 * register controls the UDMA timings. At least, it seems bit 0
 * of this one enables UDMA vs. MDMA, and bits 4..7 are the
 * cycle time in units of 10ns. Bits 8..15 are used by I don't
 * know their meaning yet
 */
#define TR_100_PIOREG_PIO_MASK		0xff000fff
#define TR_100_PIOREG_MDMA_MASK		0x00fff000
#define TR_100_UDMAREG_UDMA_MASK	0x0000ffff
#define TR_100_UDMAREG_UDMA_EN		0x00000001


/* 66Mhz cell, found in KeyLargo. Can do ultra mode 0 to 2 on
 * 40 connector cable and to 4 on 80 connector one.
 * Clock unit is 15ns (66Mhz)
 * 
 * 3 Values can be programmed:
 *  - Write data setup, which appears to match the cycle time. They
 *    also call it DIOW setup.
 *  - Ready to pause time (from spec)
 *  - Address setup. That one is weird. I don't see where exactly
 *    it fits in UDMA cycles, I got it's name from an obscure piece
 *    of commented out code in Darwin. They leave it to 0, we do as
 *    well, despite a comment that would lead to think it has a
 *    min value of 45ns.
 * Apple also add 60ns to the write data setup (or cycle time ?) on
 * reads.
 */
#define TR_66_UDMA_MASK			0xfff00000
#define TR_66_UDMA_EN			0x00100000 /* Enable Ultra mode for DMA */
#define TR_66_UDMA_ADDRSETUP_MASK	0xe0000000 /* Address setup */
#define TR_66_UDMA_ADDRSETUP_SHIFT	29
#define TR_66_UDMA_RDY2PAUS_MASK	0x1e000000 /* Ready 2 pause time */
#define TR_66_UDMA_RDY2PAUS_SHIFT	25
#define TR_66_UDMA_WRDATASETUP_MASK	0x01e00000 /* Write data setup time */
#define TR_66_UDMA_WRDATASETUP_SHIFT	21
#define TR_66_MDMA_MASK			0x000ffc00
#define TR_66_MDMA_RECOVERY_MASK	0x000f8000
#define TR_66_MDMA_RECOVERY_SHIFT	15
#define TR_66_MDMA_ACCESS_MASK		0x00007c00
#define TR_66_MDMA_ACCESS_SHIFT		10
#define TR_66_PIO_MASK			0x000003ff
#define TR_66_PIO_RECOVERY_MASK		0x000003e0
#define TR_66_PIO_RECOVERY_SHIFT	5
#define TR_66_PIO_ACCESS_MASK		0x0000001f
#define TR_66_PIO_ACCESS_SHIFT		0

/* 33Mhz cell, found in OHare, Heathrow (& Paddington) and KeyLargo
 * Can do pio & mdma modes, clock unit is 30ns (33Mhz)
 * 
 * The access time and recovery time can be programmed. Some older
 * Darwin code base limit OHare to 150ns cycle time. I decided to do
 * the same here fore safety against broken old hardware ;)
 * The HalfTick bit, when set, adds half a clock (15ns) to the access
 * time and removes one from recovery. It's not supported on KeyLargo
 * implementation afaik. The E bit appears to be set for PIO mode 0 and
 * is used to reach long timings used in this mode.
 */
#define TR_33_MDMA_MASK			0x003ff800
#define TR_33_MDMA_RECOVERY_MASK	0x001f0000
#define TR_33_MDMA_RECOVERY_SHIFT	16
#define TR_33_MDMA_ACCESS_MASK		0x0000f800
#define TR_33_MDMA_ACCESS_SHIFT		11
#define TR_33_MDMA_HALFTICK		0x00200000
#define TR_33_PIO_MASK			0x000007ff
#define TR_33_PIO_E			0x00000400
#define TR_33_PIO_RECOVERY_MASK		0x000003e0
#define TR_33_PIO_RECOVERY_SHIFT	5
#define TR_33_PIO_ACCESS_MASK		0x0000001f
#define TR_33_PIO_ACCESS_SHIFT		0

/*
 * Interrupt register definitions
 */
#define IDE_INTR_DMA			0x80000000
#define IDE_INTR_DEVICE			0x40000000

/*
 * FCR Register on Kauai. Not sure what bit 0x4 is  ...
 */
#define KAUAI_FCR_UATA_MAGIC		0x00000004
#define KAUAI_FCR_UATA_RESET_N		0x00000002
#define KAUAI_FCR_UATA_ENABLE		0x00000001

/* Rounded Multiword DMA timings
 * 
 * I gave up finding a generic formula for all controller
 * types and instead, built tables based on timing values
 * used by Apple in Darwin's implementation.
 */
struct mdma_timings_t {
	int	accessTime;
	int	recoveryTime;
	int	cycleTime;
};

struct mdma_timings_t mdma_timings_33[] =
{
    { 240, 240, 480 },
    { 180, 180, 360 },
    { 135, 135, 270 },
    { 120, 120, 240 },
    { 105, 105, 210 },
    {  90,  90, 180 },
    {  75,  75, 150 },
    {  75,  45, 120 },
    {   0,   0,   0 }
};

struct mdma_timings_t mdma_timings_33k[] =
{
    { 240, 240, 480 },
    { 180, 180, 360 },
    { 150, 150, 300 },
    { 120, 120, 240 },
    {  90, 120, 210 },
    {  90,  90, 180 },
    {  90,  60, 150 },
    {  90,  30, 120 },
    {   0,   0,   0 }
};

struct mdma_timings_t mdma_timings_66[] =
{
    { 240, 240, 480 },
    { 180, 180, 360 },
    { 135, 135, 270 },
    { 120, 120, 240 },
    { 105, 105, 210 },
    {  90,  90, 180 },
    {  90,  75, 165 },
    {  75,  45, 120 },
    {   0,   0,   0 }
};

/* KeyLargo ATA-4 Ultra DMA timings (rounded) */
struct {
	int	addrSetup; /* ??? */
	int	rdy2pause;
	int	wrDataSetup;
} kl66_udma_timings[] =
{
    {   0, 180,  120 },	/* Mode 0 */
    {   0, 150,  90 },	/*      1 */
    {   0, 120,  60 },	/*      2 */
    {   0, 90,   45 },	/*      3 */
    {   0, 90,   30 }	/*      4 */
};

/* UniNorth 2 ATA/100 timings */
struct kauai_timing {
	int	cycle_time;
	u32	timing_reg;
};

static struct kauai_timing	kauai_pio_timings[] =
{
	{ 930	, 0x08000fff },
	{ 600	, 0x08000a92 },
	{ 383	, 0x0800060f },
	{ 360	, 0x08000492 },
	{ 330	, 0x0800048f },
	{ 300	, 0x080003cf },
	{ 270	, 0x080003cc },
	{ 240	, 0x0800038b },
	{ 239	, 0x0800030c },
	{ 180	, 0x05000249 },
	{ 120	, 0x04000148 },
	{ 0	, 0 },
};

static struct kauai_timing	kauai_mdma_timings[] =
{
	{ 1260	, 0x00fff000 },
	{ 480	, 0x00618000 },
	{ 360	, 0x00492000 },
	{ 270	, 0x0038e000 },
	{ 240	, 0x0030c000 },
	{ 210	, 0x002cb000 },
	{ 180	, 0x00249000 },
	{ 150	, 0x00209000 },
	{ 120	, 0x00148000 },
	{ 0	, 0 },
};

static struct kauai_timing	kauai_udma_timings[] =
{
	{ 120	, 0x000070c0 },
	{ 90	, 0x00005d80 },
	{ 60	, 0x00004a60 },
	{ 45	, 0x00003a50 },
	{ 30	, 0x00002a30 },
	{ 20	, 0x00002921 },
	{ 0	, 0 },
};

static struct kauai_timing	shasta_pio_timings[] =
{
	{ 930	, 0x08000fff },
	{ 600	, 0x0A000c97 },
	{ 383	, 0x07000712 },
	{ 360	, 0x040003cd },
	{ 330	, 0x040003cd },
	{ 300	, 0x040003cd },
	{ 270	, 0x040003cd },
	{ 240	, 0x040003cd },
	{ 239	, 0x040003cd },
	{ 180	, 0x0400028b },
	{ 120	, 0x0400010a },
	{ 0	, 0 },
};

static struct kauai_timing	shasta_mdma_timings[] =
{
	{ 1260	, 0x00fff000 },
	{ 480	, 0x00820800 },
	{ 360	, 0x00820800 },
	{ 270	, 0x00820800 },
	{ 240	, 0x00820800 },
	{ 210	, 0x00820800 },
	{ 180	, 0x00820800 },
	{ 150	, 0x0028b000 },
	{ 120	, 0x001ca000 },
	{ 0	, 0 },
};

static struct kauai_timing	shasta_udma133_timings[] =
{
	{ 120   , 0x00035901, },
	{ 90    , 0x000348b1, },
	{ 60    , 0x00033881, },
	{ 45    , 0x00033861, },
	{ 30    , 0x00033841, },
	{ 20    , 0x00033031, },
	{ 15    , 0x00033021, },
	{ 0	, 0 },
};


static inline u32
kauai_lookup_timing(struct kauai_timing* table, int cycle_time)
{
	int i;
	
	for (i=0; table[i].cycle_time; i++)
		if (cycle_time > table[i+1].cycle_time)
			return table[i].timing_reg;
	BUG();
	return 0;
}

/* allow up to 256 DBDMA commands per xfer */
#define MAX_DCMDS		256

/* 
 * Wait 1s for disk to answer on IDE bus after a hard reset
 * of the device (via GPIO/FCR).
 * 
 * Some devices seem to "pollute" the bus even after dropping
 * the BSY bit (typically some combo drives slave on the UDMA
 * bus) after a hard reset. Since we hard reset all drives on
 * KeyLargo ATA66, we have to keep that delay around. I may end
 * up not hard resetting anymore on these and keep the delay only
 * for older interfaces instead (we have to reset when coming
 * from MacOS...) --BenH. 
 */
#define IDE_WAKEUP_DELAY	(1*HZ)

static int pmac_ide_init_dma(ide_hwif_t *, const struct ide_port_info *);

#define PMAC_IDE_REG(x) \
	((void __iomem *)((drive)->hwif->io_ports.data_addr + (x)))

/*
 * Apply the timings of the proper unit (master/slave) to the shared
 * timing register when selecting that unit. This version is for
 * ASICs with a single timing register
 */
static void pmac_ide_apply_timings(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	pmac_ide_hwif_t *pmif = dev_get_drvdata(hwif->gendev.parent);

	if (drive->dn & 1)
		writel(pmif->timings[1], PMAC_IDE_REG(IDE_TIMING_CONFIG));
	else
		writel(pmif->timings[0], PMAC_IDE_REG(IDE_TIMING_CONFIG));
	(void)readl(PMAC_IDE_REG(IDE_TIMING_CONFIG));
}

/*
 * Apply the timings of the proper unit (master/slave) to the shared
 * timing register when selecting that unit. This version is for
 * ASICs with a dual timing register (Kauai)
 */
static void pmac_ide_kauai_apply_timings(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	pmac_ide_hwif_t *pmif = dev_get_drvdata(hwif->gendev.parent);

	if (drive->dn & 1) {
		writel(pmif->timings[1], PMAC_IDE_REG(IDE_KAUAI_PIO_CONFIG));
		writel(pmif->timings[3], PMAC_IDE_REG(IDE_KAUAI_ULTRA_CONFIG));
	} else {
		writel(pmif->timings[0], PMAC_IDE_REG(IDE_KAUAI_PIO_CONFIG));
		writel(pmif->timings[2], PMAC_IDE_REG(IDE_KAUAI_ULTRA_CONFIG));
	}
	(void)readl(PMAC_IDE_REG(IDE_KAUAI_PIO_CONFIG));
}

/*
 * Force an update of controller timing values for a given drive
 */
static void
pmac_ide_do_update_timings(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	pmac_ide_hwif_t *pmif = dev_get_drvdata(hwif->gendev.parent);

	if (pmif->kind == controller_sh_ata6 ||
	    pmif->kind == controller_un_ata6 ||
	    pmif->kind == controller_k2_ata6)
		pmac_ide_kauai_apply_timings(drive);
	else
		pmac_ide_apply_timings(drive);
}

static void pmac_dev_select(ide_drive_t *drive)
{
	pmac_ide_apply_timings(drive);

	writeb(drive->select | ATA_DEVICE_OBS,
	       (void __iomem *)drive->hwif->io_ports.device_addr);
}

static void pmac_kauai_dev_select(ide_drive_t *drive)
{
	pmac_ide_kauai_apply_timings(drive);

	writeb(drive->select | ATA_DEVICE_OBS,
	       (void __iomem *)drive->hwif->io_ports.device_addr);
}

static void pmac_exec_command(ide_hwif_t *hwif, u8 cmd)
{
	writeb(cmd, (void __iomem *)hwif->io_ports.command_addr);
	(void)readl((void __iomem *)(hwif->io_ports.data_addr
				     + IDE_TIMING_CONFIG));
}

static void pmac_write_devctl(ide_hwif_t *hwif, u8 ctl)
{
	writeb(ctl, (void __iomem *)hwif->io_ports.ctl_addr);
	(void)readl((void __iomem *)(hwif->io_ports.data_addr
				     + IDE_TIMING_CONFIG));
}

/*
 * Old tuning functions (called on hdparm -p), sets up drive PIO timings
 */
static void pmac_ide_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
	pmac_ide_hwif_t *pmif = dev_get_drvdata(hwif->gendev.parent);
	const u8 pio = drive->pio_mode - XFER_PIO_0;
	struct ide_timing *tim = ide_timing_find_mode(XFER_PIO_0 + pio);
	u32 *timings, t;
	unsigned accessTicks, recTicks;
	unsigned accessTime, recTime;
	unsigned int cycle_time;

	/* which drive is it ? */
	timings = &pmif->timings[drive->dn & 1];
	t = *timings;

	cycle_time = ide_pio_cycle_time(drive, pio);

	switch (pmif->kind) {
	case controller_sh_ata6: {
		/* 133Mhz cell */
		u32 tr = kauai_lookup_timing(shasta_pio_timings, cycle_time);
		t = (t & ~TR_133_PIOREG_PIO_MASK) | tr;
		break;
		}
	case controller_un_ata6:
	case controller_k2_ata6: {
		/* 100Mhz cell */
		u32 tr = kauai_lookup_timing(kauai_pio_timings, cycle_time);
		t = (t & ~TR_100_PIOREG_PIO_MASK) | tr;
		break;
		}
	case controller_kl_ata4:
		/* 66Mhz cell */
		recTime = cycle_time - tim->active - tim->setup;
		recTime = max(recTime, 150U);
		accessTime = tim->active;
		accessTime = max(accessTime, 150U);
		accessTicks = SYSCLK_TICKS_66(accessTime);
		accessTicks = min(accessTicks, 0x1fU);
		recTicks = SYSCLK_TICKS_66(recTime);
		recTicks = min(recTicks, 0x1fU);
		t = (t & ~TR_66_PIO_MASK) |
			(accessTicks << TR_66_PIO_ACCESS_SHIFT) |
			(recTicks << TR_66_PIO_RECOVERY_SHIFT);
		break;
	default: {
		/* 33Mhz cell */
		int ebit = 0;
		recTime = cycle_time - tim->active - tim->setup;
		recTime = max(recTime, 150U);
		accessTime = tim->active;
		accessTime = max(accessTime, 150U);
		accessTicks = SYSCLK_TICKS(accessTime);
		accessTicks = min(accessTicks, 0x1fU);
		accessTicks = max(accessTicks, 4U);
		recTicks = SYSCLK_TICKS(recTime);
		recTicks = min(recTicks, 0x1fU);
		recTicks = max(recTicks, 5U) - 4;
		if (recTicks > 9) {
			recTicks--; /* guess, but it's only for PIO0, so... */
			ebit = 1;
		}
		t = (t & ~TR_33_PIO_MASK) |
				(accessTicks << TR_33_PIO_ACCESS_SHIFT) |
				(recTicks << TR_33_PIO_RECOVERY_SHIFT);
		if (ebit)
			t |= TR_33_PIO_E;
		break;
		}
	}

#ifdef IDE_PMAC_DEBUG
	printk(KERN_ERR "%s: Set PIO timing for mode %d, reg: 0x%08x\n",
		drive->name, pio,  *timings);
#endif	

	*timings = t;
	pmac_ide_do_update_timings(drive);
}

/*
 * Calculate KeyLargo ATA/66 UDMA timings
 */
static int
set_timings_udma_ata4(u32 *timings, u8 speed)
{
	unsigned rdyToPauseTicks, wrDataSetupTicks, addrTicks;

	if (speed > XFER_UDMA_4)
		return 1;

	rdyToPauseTicks = SYSCLK_TICKS_66(kl66_udma_timings[speed & 0xf].rdy2pause);
	wrDataSetupTicks = SYSCLK_TICKS_66(kl66_udma_timings[speed & 0xf].wrDataSetup);
	addrTicks = SYSCLK_TICKS_66(kl66_udma_timings[speed & 0xf].addrSetup);

	*timings = ((*timings) & ~(TR_66_UDMA_MASK | TR_66_MDMA_MASK)) |
			(wrDataSetupTicks << TR_66_UDMA_WRDATASETUP_SHIFT) | 
			(rdyToPauseTicks << TR_66_UDMA_RDY2PAUS_SHIFT) |
			(addrTicks <<TR_66_UDMA_ADDRSETUP_SHIFT) |
			TR_66_UDMA_EN;
#ifdef IDE_PMAC_DEBUG
	printk(KERN_ERR "ide_pmac: Set UDMA timing for mode %d, reg: 0x%08x\n",
		speed & 0xf,  *timings);
#endif	

	return 0;
}

/*
 * Calculate Kauai ATA/100 UDMA timings
 */
static int
set_timings_udma_ata6(u32 *pio_timings, u32 *ultra_timings, u8 speed)
{
	struct ide_timing *t = ide_timing_find_mode(speed);
	u32 tr;

	if (speed > XFER_UDMA_5 || t == NULL)
		return 1;
	tr = kauai_lookup_timing(kauai_udma_timings, (int)t->udma);
	*ultra_timings = ((*ultra_timings) & ~TR_100_UDMAREG_UDMA_MASK) | tr;
	*ultra_timings = (*ultra_timings) | TR_100_UDMAREG_UDMA_EN;

	return 0;
}

/*
 * Calculate Shasta ATA/133 UDMA timings
 */
static int
set_timings_udma_shasta(u32 *pio_timings, u32 *ultra_timings, u8 speed)
{
	struct ide_timing *t = ide_timing_find_mode(speed);
	u32 tr;

	if (speed > XFER_UDMA_6 || t == NULL)
		return 1;
	tr = kauai_lookup_timing(shasta_udma133_timings, (int)t->udma);
	*ultra_timings = ((*ultra_timings) & ~TR_133_UDMAREG_UDMA_MASK) | tr;
	*ultra_timings = (*ultra_timings) | TR_133_UDMAREG_UDMA_EN;

	return 0;
}

/*
 * Calculate MDMA timings for all cells
 */
static void
set_timings_mdma(ide_drive_t *drive, int intf_type, u32 *timings, u32 *timings2,
		 	u8 speed)
{
	u16 *id = drive->id;
	int cycleTime, accessTime = 0, recTime = 0;
	unsigned accessTicks, recTicks;
	struct mdma_timings_t* tm = NULL;
	int i;

	/* Get default cycle time for mode */
	switch(speed & 0xf) {
		case 0: cycleTime = 480; break;
		case 1: cycleTime = 150; break;
		case 2: cycleTime = 120; break;
		default:
			BUG();
			break;
	}

	/* Check if drive provides explicit DMA cycle time */
	if ((id[ATA_ID_FIELD_VALID] & 2) && id[ATA_ID_EIDE_DMA_TIME])
		cycleTime = max_t(int, id[ATA_ID_EIDE_DMA_TIME], cycleTime);

	/* OHare limits according to some old Apple sources */	
	if ((intf_type == controller_ohare) && (cycleTime < 150))
		cycleTime = 150;
	/* Get the proper timing array for this controller */
	switch(intf_type) {
	        case controller_sh_ata6:
		case controller_un_ata6:
		case controller_k2_ata6:
			break;
		case controller_kl_ata4:
			tm = mdma_timings_66;
			break;
		case controller_kl_ata3:
			tm = mdma_timings_33k;
			break;
		default:
			tm = mdma_timings_33;
			break;
	}
	if (tm != NULL) {
		/* Lookup matching access & recovery times */
		i = -1;
		for (;;) {
			if (tm[i+1].cycleTime < cycleTime)
				break;
			i++;
		}
		cycleTime = tm[i].cycleTime;
		accessTime = tm[i].accessTime;
		recTime = tm[i].recoveryTime;

#ifdef IDE_PMAC_DEBUG
		printk(KERN_ERR "%s: MDMA, cycleTime: %d, accessTime: %d, recTime: %d\n",
			drive->name, cycleTime, accessTime, recTime);
#endif
	}
	switch(intf_type) {
	case controller_sh_ata6: {
		/* 133Mhz cell */
		u32 tr = kauai_lookup_timing(shasta_mdma_timings, cycleTime);
		*timings = ((*timings) & ~TR_133_PIOREG_MDMA_MASK) | tr;
		*timings2 = (*timings2) & ~TR_133_UDMAREG_UDMA_EN;
		}
		break;
	case controller_un_ata6:
	case controller_k2_ata6: {
		/* 100Mhz cell */
		u32 tr = kauai_lookup_timing(kauai_mdma_timings, cycleTime);
		*timings = ((*timings) & ~TR_100_PIOREG_MDMA_MASK) | tr;
		*timings2 = (*timings2) & ~TR_100_UDMAREG_UDMA_EN;
		}
		break;
	case controller_kl_ata4:
		/* 66Mhz cell */
		accessTicks = SYSCLK_TICKS_66(accessTime);
		accessTicks = min(accessTicks, 0x1fU);
		accessTicks = max(accessTicks, 0x1U);
		recTicks = SYSCLK_TICKS_66(recTime);
		recTicks = min(recTicks, 0x1fU);
		recTicks = max(recTicks, 0x3U);
		/* Clear out mdma bits and disable udma */
		*timings = ((*timings) & ~(TR_66_MDMA_MASK | TR_66_UDMA_MASK)) |
			(accessTicks << TR_66_MDMA_ACCESS_SHIFT) |
			(recTicks << TR_66_MDMA_RECOVERY_SHIFT);
		break;
	case controller_kl_ata3:
		/* 33Mhz cell on KeyLargo */
		accessTicks = SYSCLK_TICKS(accessTime);
		accessTicks = max(accessTicks, 1U);
		accessTicks = min(accessTicks, 0x1fU);
		accessTime = accessTicks * IDE_SYSCLK_NS;
		recTicks = SYSCLK_TICKS(recTime);
		recTicks = max(recTicks, 1U);
		recTicks = min(recTicks, 0x1fU);
		*timings = ((*timings) & ~TR_33_MDMA_MASK) |
				(accessTicks << TR_33_MDMA_ACCESS_SHIFT) |
				(recTicks << TR_33_MDMA_RECOVERY_SHIFT);
		break;
	default: {
		/* 33Mhz cell on others */
		int halfTick = 0;
		int origAccessTime = accessTime;
		int origRecTime = recTime;
		
		accessTicks = SYSCLK_TICKS(accessTime);
		accessTicks = max(accessTicks, 1U);
		accessTicks = min(accessTicks, 0x1fU);
		accessTime = accessTicks * IDE_SYSCLK_NS;
		recTicks = SYSCLK_TICKS(recTime);
		recTicks = max(recTicks, 2U) - 1;
		recTicks = min(recTicks, 0x1fU);
		recTime = (recTicks + 1) * IDE_SYSCLK_NS;
		if ((accessTicks > 1) &&
		    ((accessTime - IDE_SYSCLK_NS/2) >= origAccessTime) &&
		    ((recTime - IDE_SYSCLK_NS/2) >= origRecTime)) {
            		halfTick = 1;
			accessTicks--;
		}
		*timings = ((*timings) & ~TR_33_MDMA_MASK) |
				(accessTicks << TR_33_MDMA_ACCESS_SHIFT) |
				(recTicks << TR_33_MDMA_RECOVERY_SHIFT);
		if (halfTick)
			*timings |= TR_33_MDMA_HALFTICK;
		}
	}
#ifdef IDE_PMAC_DEBUG
	printk(KERN_ERR "%s: Set MDMA timing for mode %d, reg: 0x%08x\n",
		drive->name, speed & 0xf,  *timings);
#endif	
}

static void pmac_ide_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
	pmac_ide_hwif_t *pmif = dev_get_drvdata(hwif->gendev.parent);
	int ret = 0;
	u32 *timings, *timings2, tl[2];
	u8 unit = drive->dn & 1;
	const u8 speed = drive->dma_mode;

	timings = &pmif->timings[unit];
	timings2 = &pmif->timings[unit+2];

	/* Copy timings to local image */
	tl[0] = *timings;
	tl[1] = *timings2;

	if (speed >= XFER_UDMA_0) {
		if (pmif->kind == controller_kl_ata4)
			ret = set_timings_udma_ata4(&tl[0], speed);
		else if (pmif->kind == controller_un_ata6
			 || pmif->kind == controller_k2_ata6)
			ret = set_timings_udma_ata6(&tl[0], &tl[1], speed);
		else if (pmif->kind == controller_sh_ata6)
			ret = set_timings_udma_shasta(&tl[0], &tl[1], speed);
		else
			ret = -1;
	} else
		set_timings_mdma(drive, pmif->kind, &tl[0], &tl[1], speed);

	if (ret)
		return;

	/* Apply timings to controller */
	*timings = tl[0];
	*timings2 = tl[1];

	pmac_ide_do_update_timings(drive);	
}

/*
 * Blast some well known "safe" values to the timing registers at init or
 * wakeup from sleep time, before we do real calculation
 */
static void
sanitize_timings(pmac_ide_hwif_t *pmif)
{
	unsigned int value, value2 = 0;
	
	switch(pmif->kind) {
		case controller_sh_ata6:
			value = 0x0a820c97;
			value2 = 0x00033031;
			break;
		case controller_un_ata6:
		case controller_k2_ata6:
			value = 0x08618a92;
			value2 = 0x00002921;
			break;
		case controller_kl_ata4:
			value = 0x0008438c;
			break;
		case controller_kl_ata3:
			value = 0x00084526;
			break;
		case controller_heathrow:
		case controller_ohare:
		default:
			value = 0x00074526;
			break;
	}
	pmif->timings[0] = pmif->timings[1] = value;
	pmif->timings[2] = pmif->timings[3] = value2;
}

static int on_media_bay(pmac_ide_hwif_t *pmif)
{
	return pmif->mdev && pmif->mdev->media_bay != NULL;
}

/* Suspend call back, should be called after the child devices
 * have actually been suspended
 */
static int pmac_ide_do_suspend(pmac_ide_hwif_t *pmif)
{
	/* We clear the timings */
	pmif->timings[0] = 0;
	pmif->timings[1] = 0;
	
	disable_irq(pmif->irq);

	/* The media bay will handle itself just fine */
	if (on_media_bay(pmif))
		return 0;
	
	/* Kauai has bus control FCRs directly here */
	if (pmif->kauai_fcr) {
		u32 fcr = readl(pmif->kauai_fcr);
		fcr &= ~(KAUAI_FCR_UATA_RESET_N | KAUAI_FCR_UATA_ENABLE);
		writel(fcr, pmif->kauai_fcr);
	}

	/* Disable the bus on older machines and the cell on kauai */
	ppc_md.feature_call(PMAC_FTR_IDE_ENABLE, pmif->node, pmif->aapl_bus_id,
			    0);

	return 0;
}

/* Resume call back, should be called before the child devices
 * are resumed
 */
static int pmac_ide_do_resume(pmac_ide_hwif_t *pmif)
{
	/* Hard reset & re-enable controller (do we really need to reset ? -BenH) */
	if (!on_media_bay(pmif)) {
		ppc_md.feature_call(PMAC_FTR_IDE_RESET, pmif->node, pmif->aapl_bus_id, 1);
		ppc_md.feature_call(PMAC_FTR_IDE_ENABLE, pmif->node, pmif->aapl_bus_id, 1);
		msleep(10);
		ppc_md.feature_call(PMAC_FTR_IDE_RESET, pmif->node, pmif->aapl_bus_id, 0);

		/* Kauai has it different */
		if (pmif->kauai_fcr) {
			u32 fcr = readl(pmif->kauai_fcr);
			fcr |= KAUAI_FCR_UATA_RESET_N | KAUAI_FCR_UATA_ENABLE;
			writel(fcr, pmif->kauai_fcr);
		}

		msleep(jiffies_to_msecs(IDE_WAKEUP_DELAY));
	}

	/* Sanitize drive timings */
	sanitize_timings(pmif);

	enable_irq(pmif->irq);

	return 0;
}

static u8 pmac_ide_cable_detect(ide_hwif_t *hwif)
{
	pmac_ide_hwif_t *pmif = dev_get_drvdata(hwif->gendev.parent);
	struct device_node *np = pmif->node;
	const char *cable = of_get_property(np, "cable-type", NULL);
	struct device_node *root = of_find_node_by_path("/");
	const char *model = of_get_property(root, "model", NULL);

	of_node_put(root);
	/* Get cable type from device-tree. */
	if (cable && !strncmp(cable, "80-", 3)) {
		/* Some drives fail to detect 80c cable in PowerBook */
		/* These machine use proprietary short IDE cable anyway */
		if (!strncmp(model, "PowerBook", 9))
			return ATA_CBL_PATA40_SHORT;
		else
			return ATA_CBL_PATA80;
	}

	/*
	 * G5's seem to have incorrect cable type in device-tree.
	 * Let's assume they have a 80 conductor cable, this seem
	 * to be always the case unless the user mucked around.
	 */
	if (of_device_is_compatible(np, "K2-UATA") ||
	    of_device_is_compatible(np, "shasta-ata"))
		return ATA_CBL_PATA80;

	return ATA_CBL_PATA40;
}

static void pmac_ide_init_dev(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	pmac_ide_hwif_t *pmif = dev_get_drvdata(hwif->gendev.parent);

	if (on_media_bay(pmif)) {
		if (check_media_bay(pmif->mdev->media_bay) == MB_CD) {
			drive->dev_flags &= ~IDE_DFLAG_NOPROBE;
			return;
		}
		drive->dev_flags |= IDE_DFLAG_NOPROBE;
	}
}

static const struct ide_tp_ops pmac_tp_ops = {
	.exec_command		= pmac_exec_command,
	.read_status		= ide_read_status,
	.read_altstatus		= ide_read_altstatus,
	.write_devctl		= pmac_write_devctl,

	.dev_select		= pmac_dev_select,
	.tf_load		= ide_tf_load,
	.tf_read		= ide_tf_read,

	.input_data		= ide_input_data,
	.output_data		= ide_output_data,
};

static const struct ide_tp_ops pmac_ata6_tp_ops = {
	.exec_command		= pmac_exec_command,
	.read_status		= ide_read_status,
	.read_altstatus		= ide_read_altstatus,
	.write_devctl		= pmac_write_devctl,

	.dev_select		= pmac_kauai_dev_select,
	.tf_load		= ide_tf_load,
	.tf_read		= ide_tf_read,

	.input_data		= ide_input_data,
	.output_data		= ide_output_data,
};

static const struct ide_port_ops pmac_ide_ata4_port_ops = {
	.init_dev		= pmac_ide_init_dev,
	.set_pio_mode		= pmac_ide_set_pio_mode,
	.set_dma_mode		= pmac_ide_set_dma_mode,
	.cable_detect		= pmac_ide_cable_detect,
};

static const struct ide_port_ops pmac_ide_port_ops = {
	.init_dev		= pmac_ide_init_dev,
	.set_pio_mode		= pmac_ide_set_pio_mode,
	.set_dma_mode		= pmac_ide_set_dma_mode,
};

static const struct ide_dma_ops pmac_dma_ops;

static const struct ide_port_info pmac_port_info = {
	.name			= DRV_NAME,
	.init_dma		= pmac_ide_init_dma,
	.chipset		= ide_pmac,
	.tp_ops			= &pmac_tp_ops,
	.port_ops		= &pmac_ide_port_ops,
	.dma_ops		= &pmac_dma_ops,
	.host_flags		= IDE_HFLAG_SET_PIO_MODE_KEEP_DMA |
				  IDE_HFLAG_POST_SET_MODE |
				  IDE_HFLAG_MMIO |
				  IDE_HFLAG_UNMASK_IRQS,
	.pio_mask		= ATA_PIO4,
	.mwdma_mask		= ATA_MWDMA2,
};

/*
 * Setup, register & probe an IDE channel driven by this driver, this is
 * called by one of the 2 probe functions (macio or PCI).
 */
static int pmac_ide_setup_device(pmac_ide_hwif_t *pmif, struct ide_hw *hw)
{
	struct device_node *np = pmif->node;
	const int *bidp;
	struct ide_host *host;
	struct ide_hw *hws[] = { hw };
	struct ide_port_info d = pmac_port_info;
	int rc;

	pmif->broken_dma = pmif->broken_dma_warn = 0;
	if (of_device_is_compatible(np, "shasta-ata")) {
		pmif->kind = controller_sh_ata6;
		d.tp_ops = &pmac_ata6_tp_ops;
		d.port_ops = &pmac_ide_ata4_port_ops;
		d.udma_mask = ATA_UDMA6;
	} else if (of_device_is_compatible(np, "kauai-ata")) {
		pmif->kind = controller_un_ata6;
		d.tp_ops = &pmac_ata6_tp_ops;
		d.port_ops = &pmac_ide_ata4_port_ops;
		d.udma_mask = ATA_UDMA5;
	} else if (of_device_is_compatible(np, "K2-UATA")) {
		pmif->kind = controller_k2_ata6;
		d.tp_ops = &pmac_ata6_tp_ops;
		d.port_ops = &pmac_ide_ata4_port_ops;
		d.udma_mask = ATA_UDMA5;
	} else if (of_device_is_compatible(np, "keylargo-ata")) {
		if (of_node_name_eq(np, "ata-4")) {
			pmif->kind = controller_kl_ata4;
			d.port_ops = &pmac_ide_ata4_port_ops;
			d.udma_mask = ATA_UDMA4;
		} else
			pmif->kind = controller_kl_ata3;
	} else if (of_device_is_compatible(np, "heathrow-ata")) {
		pmif->kind = controller_heathrow;
	} else {
		pmif->kind = controller_ohare;
		pmif->broken_dma = 1;
	}

	bidp = of_get_property(np, "AAPL,bus-id", NULL);
	pmif->aapl_bus_id =  bidp ? *bidp : 0;

	/* On Kauai-type controllers, we make sure the FCR is correct */
	if (pmif->kauai_fcr)
		writel(KAUAI_FCR_UATA_MAGIC |
		       KAUAI_FCR_UATA_RESET_N |
		       KAUAI_FCR_UATA_ENABLE, pmif->kauai_fcr);
	
	/* Make sure we have sane timings */
	sanitize_timings(pmif);

	/* If we are on a media bay, wait for it to settle and lock it */
	if (pmif->mdev)
		lock_media_bay(pmif->mdev->media_bay);

	host = ide_host_alloc(&d, hws, 1);
	if (host == NULL) {
		rc = -ENOMEM;
		goto bail;
	}
	pmif->hwif = host->ports[0];

	if (on_media_bay(pmif)) {
		/* Fixup bus ID for media bay */
		if (!bidp)
			pmif->aapl_bus_id = 1;
	} else if (pmif->kind == controller_ohare) {
		/* The code below is having trouble on some ohare machines
		 * (timing related ?). Until I can put my hand on one of these
		 * units, I keep the old way
		 */
		ppc_md.feature_call(PMAC_FTR_IDE_ENABLE, np, 0, 1);
	} else {
 		/* This is necessary to enable IDE when net-booting */
		ppc_md.feature_call(PMAC_FTR_IDE_RESET, np, pmif->aapl_bus_id, 1);
		ppc_md.feature_call(PMAC_FTR_IDE_ENABLE, np, pmif->aapl_bus_id, 1);
		msleep(10);
		ppc_md.feature_call(PMAC_FTR_IDE_RESET, np, pmif->aapl_bus_id, 0);
		msleep(jiffies_to_msecs(IDE_WAKEUP_DELAY));
	}

	printk(KERN_INFO DRV_NAME ": Found Apple %s controller (%s), "
	       "bus ID %d%s, irq %d\n", model_name[pmif->kind],
	       pmif->mdev ? "macio" : "PCI", pmif->aapl_bus_id,
	       on_media_bay(pmif) ? " (mediabay)" : "", hw->irq);

	rc = ide_host_register(host, &d, hws);
	if (rc)
		pmif->hwif = NULL;

	if (pmif->mdev)
		unlock_media_bay(pmif->mdev->media_bay);

 bail:
	if (rc && host)
		ide_host_free(host);
	return rc;
}

static void pmac_ide_init_ports(struct ide_hw *hw, unsigned long base)
{
	int i;

	for (i = 0; i < 8; ++i)
		hw->io_ports_array[i] = base + i * 0x10;

	hw->io_ports.ctl_addr = base + 0x160;
}

/*
 * Attach to a macio probed interface
 */
static int pmac_ide_macio_attach(struct macio_dev *mdev,
				 const struct of_device_id *match)
{
	void __iomem *base;
	unsigned long regbase;
	pmac_ide_hwif_t *pmif;
	int irq, rc;
	struct ide_hw hw;

	pmif = kzalloc(sizeof(*pmif), GFP_KERNEL);
	if (pmif == NULL)
		return -ENOMEM;

	if (macio_resource_count(mdev) == 0) {
		printk(KERN_WARNING "ide-pmac: no address for %pOF\n",
				    mdev->ofdev.dev.of_node);
		rc = -ENXIO;
		goto out_free_pmif;
	}

	/* Request memory resource for IO ports */
	if (macio_request_resource(mdev, 0, "ide-pmac (ports)")) {
		printk(KERN_ERR "ide-pmac: can't request MMIO resource for "
				"%pOF!\n", mdev->ofdev.dev.of_node);
		rc = -EBUSY;
		goto out_free_pmif;
	}
			
	/* XXX This is bogus. Should be fixed in the registry by checking
	 * the kind of host interrupt controller, a bit like gatwick
	 * fixes in irq.c. That works well enough for the single case
	 * where that happens though...
	 */
	if (macio_irq_count(mdev) == 0) {
		printk(KERN_WARNING "ide-pmac: no intrs for device %pOF, using "
				    "13\n", mdev->ofdev.dev.of_node);
		irq = irq_create_mapping(NULL, 13);
	} else
		irq = macio_irq(mdev, 0);

	base = ioremap(macio_resource_start(mdev, 0), 0x400);
	regbase = (unsigned long) base;

	pmif->mdev = mdev;
	pmif->node = mdev->ofdev.dev.of_node;
	pmif->regbase = regbase;
	pmif->irq = irq;
	pmif->kauai_fcr = NULL;

	if (macio_resource_count(mdev) >= 2) {
		if (macio_request_resource(mdev, 1, "ide-pmac (dma)"))
			printk(KERN_WARNING "ide-pmac: can't request DMA "
					    "resource for %pOF!\n",
					    mdev->ofdev.dev.of_node);
		else
			pmif->dma_regs = ioremap(macio_resource_start(mdev, 1), 0x1000);
	} else
		pmif->dma_regs = NULL;

	dev_set_drvdata(&mdev->ofdev.dev, pmif);

	memset(&hw, 0, sizeof(hw));
	pmac_ide_init_ports(&hw, pmif->regbase);
	hw.irq = irq;
	hw.dev = &mdev->bus->pdev->dev;
	hw.parent = &mdev->ofdev.dev;

	rc = pmac_ide_setup_device(pmif, &hw);
	if (rc != 0) {
		/* The inteface is released to the common IDE layer */
		dev_set_drvdata(&mdev->ofdev.dev, NULL);
		iounmap(base);
		if (pmif->dma_regs) {
			iounmap(pmif->dma_regs);
			macio_release_resource(mdev, 1);
		}
		macio_release_resource(mdev, 0);
		kfree(pmif);
	}

	return rc;

out_free_pmif:
	kfree(pmif);
	return rc;
}

static int
pmac_ide_macio_suspend(struct macio_dev *mdev, pm_message_t mesg)
{
	pmac_ide_hwif_t *pmif = dev_get_drvdata(&mdev->ofdev.dev);
	int rc = 0;

	if (mesg.event != mdev->ofdev.dev.power.power_state.event
			&& (mesg.event & PM_EVENT_SLEEP)) {
		rc = pmac_ide_do_suspend(pmif);
		if (rc == 0)
			mdev->ofdev.dev.power.power_state = mesg;
	}

	return rc;
}

static int
pmac_ide_macio_resume(struct macio_dev *mdev)
{
	pmac_ide_hwif_t *pmif = dev_get_drvdata(&mdev->ofdev.dev);
	int rc = 0;

	if (mdev->ofdev.dev.power.power_state.event != PM_EVENT_ON) {
		rc = pmac_ide_do_resume(pmif);
		if (rc == 0)
			mdev->ofdev.dev.power.power_state = PMSG_ON;
	}

	return rc;
}

/*
 * Attach to a PCI probed interface
 */
static int pmac_ide_pci_attach(struct pci_dev *pdev,
			       const struct pci_device_id *id)
{
	struct device_node *np;
	pmac_ide_hwif_t *pmif;
	void __iomem *base;
	unsigned long rbase, rlen;
	int rc;
	struct ide_hw hw;

	np = pci_device_to_OF_node(pdev);
	if (np == NULL) {
		printk(KERN_ERR "ide-pmac: cannot find MacIO node for Kauai ATA interface\n");
		return -ENODEV;
	}

	pmif = kzalloc(sizeof(*pmif), GFP_KERNEL);
	if (pmif == NULL)
		return -ENOMEM;

	if (pci_enable_device(pdev)) {
		printk(KERN_WARNING "ide-pmac: Can't enable PCI device for "
				    "%pOF\n", np);
		rc = -ENXIO;
		goto out_free_pmif;
	}
	pci_set_master(pdev);
			
	if (pci_request_regions(pdev, "Kauai ATA")) {
		printk(KERN_ERR "ide-pmac: Cannot obtain PCI resources for "
				"%pOF\n", np);
		rc = -ENXIO;
		goto out_free_pmif;
	}

	pmif->mdev = NULL;
	pmif->node = np;

	rbase = pci_resource_start(pdev, 0);
	rlen = pci_resource_len(pdev, 0);

	base = ioremap(rbase, rlen);
	pmif->regbase = (unsigned long) base + 0x2000;
	pmif->dma_regs = base + 0x1000;
	pmif->kauai_fcr = base;
	pmif->irq = pdev->irq;

	pci_set_drvdata(pdev, pmif);

	memset(&hw, 0, sizeof(hw));
	pmac_ide_init_ports(&hw, pmif->regbase);
	hw.irq = pdev->irq;
	hw.dev = &pdev->dev;

	rc = pmac_ide_setup_device(pmif, &hw);
	if (rc != 0) {
		/* The inteface is released to the common IDE layer */
		iounmap(base);
		pci_release_regions(pdev);
		kfree(pmif);
	}

	return rc;

out_free_pmif:
	kfree(pmif);
	return rc;
}

static int
pmac_ide_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
{
	pmac_ide_hwif_t *pmif = pci_get_drvdata(pdev);
	int rc = 0;

	if (mesg.event != pdev->dev.power.power_state.event
			&& (mesg.event & PM_EVENT_SLEEP)) {
		rc = pmac_ide_do_suspend(pmif);
		if (rc == 0)
			pdev->dev.power.power_state = mesg;
	}

	return rc;
}

static int
pmac_ide_pci_resume(struct pci_dev *pdev)
{
	pmac_ide_hwif_t *pmif = pci_get_drvdata(pdev);
	int rc = 0;

	if (pdev->dev.power.power_state.event != PM_EVENT_ON) {
		rc = pmac_ide_do_resume(pmif);
		if (rc == 0)
			pdev->dev.power.power_state = PMSG_ON;
	}

	return rc;
}

#ifdef CONFIG_PMAC_MEDIABAY
static void pmac_ide_macio_mb_event(struct macio_dev* mdev, int mb_state)
{
	pmac_ide_hwif_t *pmif = dev_get_drvdata(&mdev->ofdev.dev);

	switch(mb_state) {
	case MB_CD:
		if (!pmif->hwif->present)
			ide_port_scan(pmif->hwif);
		break;
	default:
		if (pmif->hwif->present)
			ide_port_unregister_devices(pmif->hwif);
	}
}
#endif /* CONFIG_PMAC_MEDIABAY */


static struct of_device_id pmac_ide_macio_match[] = 
{
	{
	.name 		= "IDE",
	},
	{
	.name 		= "ATA",
	},
	{
	.type		= "ide",
	},
	{
	.type		= "ata",
	},
	{},
};

static struct macio_driver pmac_ide_macio_driver = 
{
	.driver = {
		.name 		= "ide-pmac",
		.owner		= THIS_MODULE,
		.of_match_table	= pmac_ide_macio_match,
	},
	.probe		= pmac_ide_macio_attach,
	.suspend	= pmac_ide_macio_suspend,
	.resume		= pmac_ide_macio_resume,
#ifdef CONFIG_PMAC_MEDIABAY
	.mediabay_event	= pmac_ide_macio_mb_event,
#endif
};

static const struct pci_device_id pmac_ide_pci_match[] = {
	{ PCI_VDEVICE(APPLE, PCI_DEVICE_ID_APPLE_UNI_N_ATA),	0 },
	{ PCI_VDEVICE(APPLE, PCI_DEVICE_ID_APPLE_IPID_ATA100),	0 },
	{ PCI_VDEVICE(APPLE, PCI_DEVICE_ID_APPLE_K2_ATA100),	0 },
	{ PCI_VDEVICE(APPLE, PCI_DEVICE_ID_APPLE_SH_ATA),	0 },
	{ PCI_VDEVICE(APPLE, PCI_DEVICE_ID_APPLE_IPID2_ATA),	0 },
	{},
};

static struct pci_driver pmac_ide_pci_driver = {
	.name		= "ide-pmac",
	.id_table	= pmac_ide_pci_match,
	.probe		= pmac_ide_pci_attach,
	.suspend	= pmac_ide_pci_suspend,
	.resume		= pmac_ide_pci_resume,
};
MODULE_DEVICE_TABLE(pci, pmac_ide_pci_match);

int __init pmac_ide_probe(void)
{
	int error;

	if (!machine_is(powermac))
		return -ENODEV;

#ifdef CONFIG_BLK_DEV_IDE_PMAC_ATA100FIRST
	error = pci_register_driver(&pmac_ide_pci_driver);
	if (error)
		goto out;
	error = macio_register_driver(&pmac_ide_macio_driver);
	if (error) {
		pci_unregister_driver(&pmac_ide_pci_driver);
		goto out;
	}
#else
	error = macio_register_driver(&pmac_ide_macio_driver);
	if (error)
		goto out;
	error = pci_register_driver(&pmac_ide_pci_driver);
	if (error) {
		macio_unregister_driver(&pmac_ide_macio_driver);
		goto out;
	}
#endif
out:
	return error;
}

/*
 * pmac_ide_build_dmatable builds the DBDMA command list
 * for a transfer and sets the DBDMA channel to point to it.
 */
static int pmac_ide_build_dmatable(ide_drive_t *drive, struct ide_cmd *cmd)
{
	ide_hwif_t *hwif = drive->hwif;
	pmac_ide_hwif_t *pmif = dev_get_drvdata(hwif->gendev.parent);
	struct dbdma_cmd *table;
	volatile struct dbdma_regs __iomem *dma = pmif->dma_regs;
	struct scatterlist *sg;
	int wr = !!(cmd->tf_flags & IDE_TFLAG_WRITE);
	int i = cmd->sg_nents, count = 0;

	/* DMA table is already aligned */
	table = (struct dbdma_cmd *) pmif->dma_table_cpu;

	/* Make sure DMA controller is stopped (necessary ?) */
	writel((RUN|PAUSE|FLUSH|WAKE|DEAD) << 16, &dma->control);
	while (readl(&dma->status) & RUN)
		udelay(1);

	/* Build DBDMA commands list */
	sg = hwif->sg_table;
	while (i && sg_dma_len(sg)) {
		u32 cur_addr;
		u32 cur_len;

		cur_addr = sg_dma_address(sg);
		cur_len = sg_dma_len(sg);

		if (pmif->broken_dma && cur_addr & (L1_CACHE_BYTES - 1)) {
			if (pmif->broken_dma_warn == 0) {
				printk(KERN_WARNING "%s: DMA on non aligned address, "
				       "switching to PIO on Ohare chipset\n", drive->name);
				pmif->broken_dma_warn = 1;
			}
			return 0;
		}
		while (cur_len) {
			unsigned int tc = (cur_len < 0xfe00)? cur_len: 0xfe00;

			if (count++ >= MAX_DCMDS) {
				printk(KERN_WARNING "%s: DMA table too small\n",
				       drive->name);
				return 0;
			}
			table->command = cpu_to_le16(wr? OUTPUT_MORE: INPUT_MORE);
			table->req_count = cpu_to_le16(tc);
			table->phy_addr = cpu_to_le32(cur_addr);
			table->cmd_dep = 0;
			table->xfer_status = 0;
			table->res_count = 0;
			cur_addr += tc;
			cur_len -= tc;
			++table;
		}
		sg = sg_next(sg);
		i--;
	}

	/* convert the last command to an input/output last command */
	if (count) {
		table[-1].command = cpu_to_le16(wr? OUTPUT_LAST: INPUT_LAST);
		/* add the stop command to the end of the list */
		memset(table, 0, sizeof(struct dbdma_cmd));
		table->command = cpu_to_le16(DBDMA_STOP);
		mb();
		writel(hwif->dmatable_dma, &dma->cmdptr);
		return 1;
	}

	printk(KERN_DEBUG "%s: empty DMA table?\n", drive->name);

	return 0; /* revert to PIO for this request */
}

/*
 * Prepare a DMA transfer. We build the DMA table, adjust the timings for
 * a read on KeyLargo ATA/66 and mark us as waiting for DMA completion
 */
static int pmac_ide_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
{
	ide_hwif_t *hwif = drive->hwif;
	pmac_ide_hwif_t *pmif = dev_get_drvdata(hwif->gendev.parent);
	u8 unit = drive->dn & 1, ata4 = (pmif->kind == controller_kl_ata4);
	u8 write = !!(cmd->tf_flags & IDE_TFLAG_WRITE);

	if (pmac_ide_build_dmatable(drive, cmd) == 0)
		return 1;

	/* Apple adds 60ns to wrDataSetup on reads */
	if (ata4 && (pmif->timings[unit] & TR_66_UDMA_EN)) {
		writel(pmif->timings[unit] + (write ? 0 : 0x00800000UL),
			PMAC_IDE_REG(IDE_TIMING_CONFIG));
		(void)readl(PMAC_IDE_REG(IDE_TIMING_CONFIG));
	}

	return 0;
}

/*
 * Kick the DMA controller into life after the DMA command has been issued
 * to the drive.
 */
static void
pmac_ide_dma_start(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	pmac_ide_hwif_t *pmif = dev_get_drvdata(hwif->gendev.parent);
	volatile struct dbdma_regs __iomem *dma;

	dma = pmif->dma_regs;

	writel((RUN << 16) | RUN, &dma->control);
	/* Make sure it gets to the controller right now */
	(void)readl(&dma->control);
}

/*
 * After a DMA transfer, make sure the controller is stopped
 */
static int
pmac_ide_dma_end (ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	pmac_ide_hwif_t *pmif = dev_get_drvdata(hwif->gendev.parent);
	volatile struct dbdma_regs __iomem *dma = pmif->dma_regs;
	u32 dstat;

	dstat = readl(&dma->status);
	writel(((RUN|WAKE|DEAD) << 16), &dma->control);

	/* verify good dma status. we don't check for ACTIVE beeing 0. We should...
	 * in theory, but with ATAPI decices doing buffer underruns, that would
	 * cause us to disable DMA, which isn't what we want
	 */
	return (dstat & (RUN|DEAD)) != RUN;
}

/*
 * Check out that the interrupt we got was for us. We can't always know this
 * for sure with those Apple interfaces (well, we could on the recent ones but
 * that's not implemented yet), on the other hand, we don't have shared interrupts
 * so it's not really a problem
 */
static int
pmac_ide_dma_test_irq (ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	pmac_ide_hwif_t *pmif = dev_get_drvdata(hwif->gendev.parent);
	volatile struct dbdma_regs __iomem *dma = pmif->dma_regs;
	unsigned long status, timeout;

	/* We have to things to deal with here:
	 * 
	 * - The dbdma won't stop if the command was started
	 * but completed with an error without transferring all
	 * datas. This happens when bad blocks are met during
	 * a multi-block transfer.
	 * 
	 * - The dbdma fifo hasn't yet finished flushing to
	 * to system memory when the disk interrupt occurs.
	 * 
	 */

	/* If ACTIVE is cleared, the STOP command have passed and
	 * transfer is complete.
	 */
	status = readl(&dma->status);
	if (!(status & ACTIVE))
		return 1;

	/* If dbdma didn't execute the STOP command yet, the
	 * active bit is still set. We consider that we aren't
	 * sharing interrupts (which is hopefully the case with
	 * those controllers) and so we just try to flush the
	 * channel for pending data in the fifo
	 */
	udelay(1);
	writel((FLUSH << 16) | FLUSH, &dma->control);
	timeout = 0;
	for (;;) {
		udelay(1);
		status = readl(&dma->status);
		if ((status & FLUSH) == 0)
			break;
		if (++timeout > 100) {
			printk(KERN_WARNING "ide%d, ide_dma_test_irq timeout flushing channel\n",
			       hwif->index);
			break;
		}
	}	
	return 1;
}

static void pmac_ide_dma_host_set(ide_drive_t *drive, int on)
{
}

static void
pmac_ide_dma_lost_irq (ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	pmac_ide_hwif_t *pmif = dev_get_drvdata(hwif->gendev.parent);
	volatile struct dbdma_regs __iomem *dma = pmif->dma_regs;
	unsigned long status = readl(&dma->status);

	printk(KERN_ERR "ide-pmac lost interrupt, dma status: %lx\n", status);
}

static const struct ide_dma_ops pmac_dma_ops = {
	.dma_host_set		= pmac_ide_dma_host_set,
	.dma_setup		= pmac_ide_dma_setup,
	.dma_start		= pmac_ide_dma_start,
	.dma_end		= pmac_ide_dma_end,
	.dma_test_irq		= pmac_ide_dma_test_irq,
	.dma_lost_irq		= pmac_ide_dma_lost_irq,
};

/*
 * Allocate the data structures needed for using DMA with an interface
 * and fill the proper list of functions pointers
 */
static int pmac_ide_init_dma(ide_hwif_t *hwif, const struct ide_port_info *d)
{
	pmac_ide_hwif_t *pmif = dev_get_drvdata(hwif->gendev.parent);
	struct pci_dev *dev = to_pci_dev(hwif->dev);

	/* We won't need pci_dev if we switch to generic consistent
	 * DMA routines ...
	 */
	if (dev == NULL || pmif->dma_regs == 0)
		return -ENODEV;
	/*
	 * Allocate space for the DBDMA commands.
	 * The +2 is +1 for the stop command and +1 to allow for
	 * aligning the start address to a multiple of 16 bytes.
	 */
	pmif->dma_table_cpu = dma_alloc_coherent(&dev->dev,
		(MAX_DCMDS + 2) * sizeof(struct dbdma_cmd),
		&hwif->dmatable_dma, GFP_KERNEL);
	if (pmif->dma_table_cpu == NULL) {
		printk(KERN_ERR "%s: unable to allocate DMA command list\n",
		       hwif->name);
		return -ENOMEM;
	}

	hwif->sg_max_nents = MAX_DCMDS;

	return 0;
}

module_init(pmac_ide_probe);

MODULE_LICENSE("GPL");