libata/drivers: Add driver for Apple "MacIO" IDE controller

This is a libata driver for the "macio" IDE controller used on most Apple
PowerMac and PowerBooks. It's a libata equivalent of drivers/ide/ppc/pmac.c

It supports all the features of its predecessor, including mediabay hotplug
and suspend/resume. It should also support module load/unload.

The timing calculations have been simplified to use pre-calculated tables
compared to drivers/ide/pmac.c and it uses the new mediabay interface
provided by a previous patch.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Tejun Heo <tj@kernel.org>

1 files changed, 1427 insertions, 0 deletions

diff --git a/drivers/ata/pata_macio.c b/drivers/ata/pata_macio.c
new file mode 100644
index 000000000000..4cc7bbd10ec2
--- /dev/null
+++ b/drivers/ata/pata_macio.c
@@ -0,0 +1,1427 @@
+/*
+ * Libata based driver for Apple "macio" family of PATA controllers
+ *
+ * Copyright 2008/2009 Benjamin Herrenschmidt, IBM Corp
+ *                     <benh@kernel.crashing.org>
+ *
+ * Some bits and pieces from drivers/ide/ppc/pmac.c
+ *
+ */
+
+#undef DEBUG
+#undef DEBUG_DMA
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/ata.h>
+#include <linux/libata.h>
+#include <linux/adb.h>
+#include <linux/pmu.h>
+#include <linux/scatterlist.h>
+#include <linux/of.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+
+#include <asm/macio.h>
+#include <asm/io.h>
+#include <asm/dbdma.h>
+#include <asm/pci-bridge.h>
+#include <asm/machdep.h>
+#include <asm/pmac_feature.h>
+#include <asm/mediabay.h>
+
+#ifdef DEBUG_DMA
+#define dev_dbgdma(dev, format, arg...)		\
+	dev_printk(KERN_DEBUG , dev , format , ## arg)
+#else
+#define dev_dbgdma(dev, format, arg...)		\
+	({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
+#endif
+
+#define DRV_NAME	"pata_macio"
+#define DRV_VERSION	"0.9"
+
+/* Models of macio ATA controller */
+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* macio_ata_names[] = {
+	"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, that's just
+ * weird and I don't now why .. at this stage
+ */
+#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 and K2. It appears as a pci device
+ * (106b/0033) on uninorth or K2 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 2x32bits registers (one
+ * for PIO & MWDMA and one for UDMA, and a similar DBDMA channel.
+ * It has it's own local feature control register as well.
+ *
+ * After scratching my mind over the timing values, at least for PIO
+ * and MDMA, I think I've figured the format of the timing register,
+ * though I use pre-calculated tables for UDMA as usual...
+ */
+#define TR_100_PIO_ADDRSETUP_MASK	0xff000000 /* Size of field unknown */
+#define TR_100_PIO_ADDRSETUP_SHIFT	24
+#define TR_100_MDMA_MASK		0x00fff000
+#define TR_100_MDMA_RECOVERY_MASK	0x00fc0000
+#define TR_100_MDMA_RECOVERY_SHIFT	18
+#define TR_100_MDMA_ACCESS_MASK		0x0003f000
+#define TR_100_MDMA_ACCESS_SHIFT	12
+#define TR_100_PIO_MASK			0xff000fff
+#define TR_100_PIO_RECOVERY_MASK	0x00000fc0
+#define TR_100_PIO_RECOVERY_SHIFT	6
+#define TR_100_PIO_ACCESS_MASK		0x0000003f
+#define TR_100_PIO_ACCESS_SHIFT		0
+
+#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_PIO_ADDRSETUP_MASK	0xe0000000 /* Address setup */
+#define TR_66_PIO_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			0xe00003ff
+#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. Only present on newer cells
+ * (Keylargo and later afaik) so we don't use it.
+ */
+#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
+
+
+/* Allow up to 256 DBDMA commands per xfer */
+#define MAX_DCMDS		256
+
+/* Don't let a DMA segment go all the way to 64K */
+#define MAX_DBDMA_SEG		0xff00
+
+
+/*
+ * 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_MS	1000
+
+struct pata_macio_timing;
+
+struct pata_macio_priv {
+	int				kind;
+	int				aapl_bus_id;
+	int				mediabay : 1;
+	struct device_node		*node;
+	struct macio_dev		*mdev;
+	struct pci_dev			*pdev;
+	struct device			*dev;
+	int				irq;
+	u32				treg[2][2];
+	void __iomem			*tfregs;
+	void __iomem			*kauai_fcr;
+	struct dbdma_cmd *		dma_table_cpu;
+	dma_addr_t			dma_table_dma;
+	struct ata_host			*host;
+	const struct pata_macio_timing	*timings;
+};
+
+/* Previous variants of this driver used to calculate timings
+ * for various variants of the chip and use tables for others.
+ *
+ * Not only was this confusing, but in addition, it isn't clear
+ * whether our calculation code was correct. It didn't entirely
+ * match the darwin code and whatever documentation I could find
+ * on these cells
+ *
+ * I decided to entirely rely on a table instead for this version
+ * of the driver. Also, because I don't really care about derated
+ * modes and really old HW other than making it work, I'm not going
+ * to calculate / snoop timing values for something else than the
+ * standard modes.
+ */
+struct pata_macio_timing {
+	int	mode;
+	u32	reg1;	/* Bits to set in first timing reg */
+	u32	reg2;	/* Bits to set in second timing reg */
+};
+
+static const struct pata_macio_timing pata_macio_ohare_timings[] = {
+	{ XFER_PIO_0,		0x00000526,	0, },
+	{ XFER_PIO_1,		0x00000085,	0, },
+	{ XFER_PIO_2,		0x00000025,	0, },
+	{ XFER_PIO_3,		0x00000025,	0, },
+	{ XFER_PIO_4,		0x00000025,	0, },
+	{ XFER_MW_DMA_0,	0x00074000,	0, },
+	{ XFER_MW_DMA_1,	0x00221000,	0, },
+	{ XFER_MW_DMA_2,	0x00211000,	0, },
+	{ -1, 0, 0 }
+};
+
+static const struct pata_macio_timing pata_macio_heathrow_timings[] = {
+	{ XFER_PIO_0,		0x00000526,	0, },
+	{ XFER_PIO_1,		0x00000085,	0, },
+	{ XFER_PIO_2,		0x00000025,	0, },
+	{ XFER_PIO_3,		0x00000025,	0, },
+	{ XFER_PIO_4,		0x00000025,	0, },
+	{ XFER_MW_DMA_0,	0x00074000,	0, },
+	{ XFER_MW_DMA_1,	0x00221000,	0, },
+	{ XFER_MW_DMA_2,	0x00211000,	0, },
+	{ -1, 0, 0 }
+};
+
+static const struct pata_macio_timing pata_macio_kl33_timings[] = {
+	{ XFER_PIO_0,		0x00000526,	0, },
+	{ XFER_PIO_1,		0x00000085,	0, },
+	{ XFER_PIO_2,		0x00000025,	0, },
+	{ XFER_PIO_3,		0x00000025,	0, },
+	{ XFER_PIO_4,		0x00000025,	0, },
+	{ XFER_MW_DMA_0,	0x00084000,	0, },
+	{ XFER_MW_DMA_1,	0x00021800,	0, },
+	{ XFER_MW_DMA_2,	0x00011800,	0, },
+	{ -1, 0, 0 }
+};
+
+static const struct pata_macio_timing pata_macio_kl66_timings[] = {
+	{ XFER_PIO_0,		0x0000038c,	0, },
+	{ XFER_PIO_1,		0x0000020a,	0, },
+	{ XFER_PIO_2,		0x00000127,	0, },
+	{ XFER_PIO_3,		0x000000c6,	0, },
+	{ XFER_PIO_4,		0x00000065,	0, },
+	{ XFER_MW_DMA_0,	0x00084000,	0, },
+	{ XFER_MW_DMA_1,	0x00029800,	0, },
+	{ XFER_MW_DMA_2,	0x00019400,	0, },
+	{ XFER_UDMA_0,		0x19100000,	0, },
+	{ XFER_UDMA_1,		0x14d00000,	0, },
+	{ XFER_UDMA_2,		0x10900000,	0, },
+	{ XFER_UDMA_3,		0x0c700000,	0, },
+	{ XFER_UDMA_4,		0x0c500000,	0, },
+	{ -1, 0, 0 }
+};
+
+static const struct pata_macio_timing pata_macio_kauai_timings[] = {
+	{ XFER_PIO_0,		0x08000a92,	0, },
+	{ XFER_PIO_1,		0x0800060f,	0, },
+	{ XFER_PIO_2,		0x0800038b,	0, },
+	{ XFER_PIO_3,		0x05000249,	0, },
+	{ XFER_PIO_4,		0x04000148,	0, },
+	{ XFER_MW_DMA_0,	0x00618000,	0, },
+	{ XFER_MW_DMA_1,	0x00209000,	0, },
+	{ XFER_MW_DMA_2,	0x00148000,	0, },
+	{ XFER_UDMA_0,		         0,	0x000070c1, },
+	{ XFER_UDMA_1,		         0,	0x00005d81, },
+	{ XFER_UDMA_2,		         0,	0x00004a61, },
+	{ XFER_UDMA_3,		         0,	0x00003a51, },
+	{ XFER_UDMA_4,		         0,	0x00002a31, },
+	{ XFER_UDMA_5,		         0,	0x00002921, },
+	{ -1, 0, 0 }
+};
+
+static const struct pata_macio_timing pata_macio_shasta_timings[] = {
+	{ XFER_PIO_0,		0x0a000c97,	0, },
+	{ XFER_PIO_1,		0x07000712,	0, },
+	{ XFER_PIO_2,		0x040003cd,	0, },
+	{ XFER_PIO_3,		0x0500028b,	0, },
+	{ XFER_PIO_4,		0x0400010a,	0, },
+	{ XFER_MW_DMA_0,	0x00820800,	0, },
+	{ XFER_MW_DMA_1,	0x0028b000,	0, },
+	{ XFER_MW_DMA_2,	0x001ca000,	0, },
+	{ XFER_UDMA_0,		         0,	0x00035901, },
+	{ XFER_UDMA_1,		         0,	0x000348b1, },
+	{ XFER_UDMA_2,		         0,	0x00033881, },
+	{ XFER_UDMA_3,		         0,	0x00033861, },
+	{ XFER_UDMA_4,		         0,	0x00033841, },
+	{ XFER_UDMA_5,		         0,	0x00033031, },
+	{ XFER_UDMA_6,		         0,	0x00033021, },
+	{ -1, 0, 0 }
+};
+
+static const struct pata_macio_timing *pata_macio_find_timing(
+					    struct pata_macio_priv *priv,
+					    int mode)
+{
+	int i;
+
+	for (i = 0; priv->timings[i].mode > 0; i++) {
+		if (priv->timings[i].mode == mode)
+			return &priv->timings[i];
+	}
+	return NULL;
+}
+
+
+static void pata_macio_apply_timings(struct ata_port *ap, unsigned int device)
+{
+	struct pata_macio_priv *priv = ap->private_data;
+	void __iomem *rbase = ap->ioaddr.cmd_addr;
+
+	if (priv->kind == controller_sh_ata6 ||
+	    priv->kind == controller_un_ata6 ||
+	    priv->kind == controller_k2_ata6) {
+		writel(priv->treg[device][0], rbase + IDE_KAUAI_PIO_CONFIG);
+		writel(priv->treg[device][1], rbase + IDE_KAUAI_ULTRA_CONFIG);
+	} else
+		writel(priv->treg[device][0], rbase + IDE_TIMING_CONFIG);
+}
+
+static void pata_macio_dev_select(struct ata_port *ap, unsigned int device)
+{
+	ata_sff_dev_select(ap, device);
+
+	/* Apply timings */
+	pata_macio_apply_timings(ap, device);
+}
+
+static void pata_macio_set_timings(struct ata_port *ap,
+				   struct ata_device *adev)
+{
+	struct pata_macio_priv *priv = ap->private_data;
+	const struct pata_macio_timing *t;
+
+	dev_dbg(priv->dev, "Set timings: DEV=%d,PIO=0x%x (%s),DMA=0x%x (%s)\n",
+		adev->devno,
+		adev->pio_mode,
+		ata_mode_string(ata_xfer_mode2mask(adev->pio_mode)),
+		adev->dma_mode,
+		ata_mode_string(ata_xfer_mode2mask(adev->dma_mode)));
+
+	/* First clear timings */
+	priv->treg[adev->devno][0] = priv->treg[adev->devno][1] = 0;
+
+	/* Now get the PIO timings */
+	t = pata_macio_find_timing(priv, adev->pio_mode);
+	if (t == NULL) {
+		dev_warn(priv->dev, "Invalid PIO timing requested: 0x%x\n",
+			 adev->pio_mode);
+		t = pata_macio_find_timing(priv, XFER_PIO_0);
+	}
+	BUG_ON(t == NULL);
+
+	/* PIO timings only ever use the first treg */
+	priv->treg[adev->devno][0] |= t->reg1;
+
+	/* Now get DMA timings */
+	t = pata_macio_find_timing(priv, adev->dma_mode);
+	if (t == NULL || (t->reg1 == 0 && t->reg2 == 0)) {
+		dev_dbg(priv->dev, "DMA timing not set yet, using MW_DMA_0\n");
+		t = pata_macio_find_timing(priv, XFER_MW_DMA_0);
+	}
+	BUG_ON(t == NULL);
+
+	/* DMA timings can use both tregs */
+	priv->treg[adev->devno][0] |= t->reg1;
+	priv->treg[adev->devno][1] |= t->reg2;
+
+	dev_dbg(priv->dev, " -> %08x %08x\n",
+		priv->treg[adev->devno][0],
+		priv->treg[adev->devno][1]);
+
+	/* Apply to hardware */
+	pata_macio_apply_timings(ap, adev->devno);
+}
+
+/*
+ * Blast some well known "safe" values to the timing registers at init or
+ * wakeup from sleep time, before we do real calculation
+ */
+static void pata_macio_default_timings(struct pata_macio_priv *priv)
+{
+	unsigned int value, value2 = 0;
+
+	switch(priv->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;
+	}
+	priv->treg[0][0] = priv->treg[1][0] = value;
+	priv->treg[0][1] = priv->treg[1][1] = value2;
+}
+
+static int pata_macio_cable_detect(struct ata_port *ap)
+{
+	struct pata_macio_priv *priv = ap->private_data;
+
+	/* Get cable type from device-tree */
+	if (priv->kind == controller_kl_ata4 ||
+	    priv->kind == controller_un_ata6 ||
+	    priv->kind == controller_k2_ata6 ||
+	    priv->kind == controller_sh_ata6) {
+		const char* cable = of_get_property(priv->node, "cable-type",
+						    NULL);
+		struct device_node *root = of_find_node_by_path("/");
+		const char *model = of_get_property(root, "model", NULL);
+
+		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 always have a 80 conductor cable, this seem to
+	 * be always the case unless the user mucked around
+	 */
+	if (of_device_is_compatible(priv->node, "K2-UATA") ||
+	    of_device_is_compatible(priv->node, "shasta-ata"))
+		return ATA_CBL_PATA80;
+
+	/* Anything else is 40 connectors */
+	return ATA_CBL_PATA40;
+}
+
+static void pata_macio_qc_prep(struct ata_queued_cmd *qc)
+{
+	unsigned int write = (qc->tf.flags & ATA_TFLAG_WRITE);
+	struct ata_port *ap = qc->ap;
+	struct pata_macio_priv *priv = ap->private_data;
+	struct scatterlist *sg;
+	struct dbdma_cmd *table;
+	unsigned int si, pi;
+
+	dev_dbgdma(priv->dev, "%s: qc %p flags %lx, write %d dev %d\n",
+		   __func__, qc, qc->flags, write, qc->dev->devno);
+
+	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
+		return;
+
+	table = (struct dbdma_cmd *) priv->dma_table_cpu;
+
+	pi = 0;
+	for_each_sg(qc->sg, sg, qc->n_elem, si) {
+		u32 addr, sg_len, len;
+
+		/* determine if physical DMA addr spans 64K boundary.
+		 * Note h/w doesn't support 64-bit, so we unconditionally
+		 * truncate dma_addr_t to u32.
+		 */
+		addr = (u32) sg_dma_address(sg);
+		sg_len = sg_dma_len(sg);
+
+		while (sg_len) {
+			/* table overflow should never happen */
+			BUG_ON (pi++ >= MAX_DCMDS);
+
+			len = (sg_len < MAX_DBDMA_SEG) ? sg_len : MAX_DBDMA_SEG;
+			st_le16(&table->command, write ? OUTPUT_MORE: INPUT_MORE);
+			st_le16(&table->req_count, len);
+			st_le32(&table->phy_addr, addr);
+			table->cmd_dep = 0;
+			table->xfer_status = 0;
+			table->res_count = 0;
+			addr += len;
+			sg_len -= len;
+			++table;
+		}
+	}
+
+	/* Should never happen according to Tejun */
+	BUG_ON(!pi);
+
+	/* Convert the last command to an input/output */
+	table--;
+	st_le16(&table->command, write ? OUTPUT_LAST: INPUT_LAST);
+	table++;
+
+	/* Add the stop command to the end of the list */
+	memset(table, 0, sizeof(struct dbdma_cmd));
+	st_le16(&table->command, DBDMA_STOP);
+
+	dev_dbgdma(priv->dev, "%s: %d DMA list entries\n", __func__, pi);
+}
+
+
+static void pata_macio_freeze(struct ata_port *ap)
+{
+	struct dbdma_regs __iomem *dma_regs = ap->ioaddr.bmdma_addr;
+
+	if (dma_regs) {
+		unsigned int timeout = 1000000;
+
+		/* Make sure DMA controller is stopped */
+		writel((RUN|PAUSE|FLUSH|WAKE|DEAD) << 16, &dma_regs->control);
+		while (--timeout && (readl(&dma_regs->status) & RUN))
+			udelay(1);
+	}
+
+	ata_sff_freeze(ap);
+}
+
+
+static void pata_macio_bmdma_setup(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct pata_macio_priv *priv = ap->private_data;
+	struct dbdma_regs __iomem *dma_regs = ap->ioaddr.bmdma_addr;
+	int dev = qc->dev->devno;
+
+	dev_dbgdma(priv->dev, "%s: qc %p\n", __func__, qc);
+
+	/* Make sure DMA commands updates are visible */
+	writel(priv->dma_table_dma, &dma_regs->cmdptr);
+
+	/* On KeyLargo 66Mhz cell, we need to add 60ns to wrDataSetup on
+	 * UDMA reads
+	 */
+	if (priv->kind == controller_kl_ata4 &&
+	    (priv->treg[dev][0] & TR_66_UDMA_EN)) {
+		void __iomem *rbase = ap->ioaddr.cmd_addr;
+		u32 reg = priv->treg[dev][0];
+
+		if (!(qc->tf.flags & ATA_TFLAG_WRITE))
+			reg += 0x00800000;
+		writel(reg, rbase + IDE_TIMING_CONFIG);
+	}
+
+	/* issue r/w command */
+	ap->ops->sff_exec_command(ap, &qc->tf);
+}
+
+static void pata_macio_bmdma_start(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct pata_macio_priv *priv = ap->private_data;
+	struct dbdma_regs __iomem *dma_regs = ap->ioaddr.bmdma_addr;
+
+	dev_dbgdma(priv->dev, "%s: qc %p\n", __func__, qc);
+
+	writel((RUN << 16) | RUN, &dma_regs->control);
+	/* Make sure it gets to the controller right now */
+	(void)readl(&dma_regs->control);
+}
+
+static void pata_macio_bmdma_stop(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct pata_macio_priv *priv = ap->private_data;
+	struct dbdma_regs __iomem *dma_regs = ap->ioaddr.bmdma_addr;
+	unsigned int timeout = 1000000;
+
+	dev_dbgdma(priv->dev, "%s: qc %p\n", __func__, qc);
+
+	/* Stop the DMA engine and wait for it to full halt */
+	writel (((RUN|WAKE|DEAD) << 16), &dma_regs->control);
+	while (--timeout && (readl(&dma_regs->status) & RUN))
+		udelay(1);
+}
+
+static u8 pata_macio_bmdma_status(struct ata_port *ap)
+{
+	struct pata_macio_priv *priv = ap->private_data;
+	struct dbdma_regs __iomem *dma_regs = ap->ioaddr.bmdma_addr;
+	u32 dstat, rstat = ATA_DMA_INTR;
+	unsigned long timeout = 0;
+
+	dstat = readl(&dma_regs->status);
+
+	dev_dbgdma(priv->dev, "%s: dstat=%x\n", __func__, dstat);
+
+	/* We have two 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.
+	 *
+	 */
+
+	/* First check for errors */
+	if ((dstat & (RUN|DEAD)) != RUN)
+		rstat |= ATA_DMA_ERR;
+
+	/* If ACTIVE is cleared, the STOP command has been hit and
+	 * the transfer is complete. If not, we have to flush the
+	 * channel.
+	 */
+	if ((dstat & ACTIVE) == 0)
+		return rstat;
+
+	dev_dbgdma(priv->dev, "%s: DMA still active, flushing...\n", __func__);
+
+	/* 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_regs->control);
+	for (;;) {
+		udelay(1);
+		dstat = readl(&dma_regs->status);
+		if ((dstat & FLUSH) == 0)
+			break;
+		if (++timeout > 1000) {
+			dev_warn(priv->dev, "timeout flushing DMA\n");
+			rstat |= ATA_DMA_ERR;
+			break;
+		}
+	}
+	return rstat;
+}
+
+/* port_start is when we allocate the DMA command list */
+static int pata_macio_port_start(struct ata_port *ap)
+{
+	struct pata_macio_priv *priv = ap->private_data;
+
+	if (ap->ioaddr.bmdma_addr == NULL)
+		return 0;
+
+	/* 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.
+	 */
+	priv->dma_table_cpu =
+		dmam_alloc_coherent(priv->dev,
+				    (MAX_DCMDS + 2) * sizeof(struct dbdma_cmd),
+				    &priv->dma_table_dma, GFP_KERNEL);
+	if (priv->dma_table_cpu == NULL) {
+		dev_err(priv->dev, "Unable to allocate DMA command list\n");
+		ap->ioaddr.bmdma_addr = NULL;
+	}
+	return 0;
+}
+
+static void pata_macio_irq_clear(struct ata_port *ap)
+{
+	struct pata_macio_priv *priv = ap->private_data;
+
+	/* Nothing to do here */
+
+	dev_dbgdma(priv->dev, "%s\n", __func__);
+}
+
+static void pata_macio_reset_hw(struct pata_macio_priv *priv, int resume)
+{
+	dev_dbg(priv->dev, "Enabling & resetting... \n");
+
+	if (priv->mediabay)
+		return;
+
+	if (priv->kind == controller_ohare && !resume) {
+		/* 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, priv->node, 0, 1);
+	} else {
+		int rc;
+
+ 		/* Reset and enable controller */
+		rc = ppc_md.feature_call(PMAC_FTR_IDE_RESET,
+					 priv->node, priv->aapl_bus_id, 1);
+		ppc_md.feature_call(PMAC_FTR_IDE_ENABLE,
+				    priv->node, priv->aapl_bus_id, 1);
+		msleep(10);
+		/* Only bother waiting if there's a reset control */
+		if (rc == 0) {
+			ppc_md.feature_call(PMAC_FTR_IDE_RESET,
+					    priv->node, priv->aapl_bus_id, 0);
+			msleep(IDE_WAKEUP_DELAY_MS);
+		}
+	}
+
+	/* If resuming a PCI device, restore the config space here */
+	if (priv->pdev && resume) {
+		int rc;
+
+		pci_restore_state(priv->pdev);
+		rc = pcim_enable_device(priv->pdev);
+		if (rc)
+			dev_printk(KERN_ERR, &priv->pdev->dev,
+				   "Failed to enable device after resume (%d)\n", rc);
+		else
+			pci_set_master(priv->pdev);
+	}
+
+	/* On Kauai, initialize the FCR. We don't perform a reset, doesn't really
+	 * seem necessary and speeds up the boot process
+	 */
+	if (priv->kauai_fcr)
+		writel(KAUAI_FCR_UATA_MAGIC |
+		       KAUAI_FCR_UATA_RESET_N |
+		       KAUAI_FCR_UATA_ENABLE, priv->kauai_fcr);
+}
+
+/* Hook the standard slave config to fixup some HW related alignment
+ * restrictions
+ */
+static int pata_macio_slave_config(struct scsi_device *sdev)
+{
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	struct pata_macio_priv *priv = ap->private_data;
+	struct ata_device *dev;
+	u16 cmd;
+	int rc;
+
+	/* First call original */
+	rc = ata_scsi_slave_config(sdev);
+	if (rc)
+		return rc;
+
+	/* This is lifted from sata_nv */
+	dev = &ap->link.device[sdev->id];
+
+	/* OHare has issues with non cache aligned DMA on some chipsets */
+	if (priv->kind == controller_ohare) {
+		blk_queue_update_dma_alignment(sdev->request_queue, 31);
+		blk_queue_update_dma_pad(sdev->request_queue, 31);
+
+		/* Tell the world about it */
+		ata_dev_printk(dev, KERN_INFO, "OHare alignment limits applied\n");
+		return 0;
+	}
+
+	/* We only have issues with ATAPI */
+	if (dev->class != ATA_DEV_ATAPI)
+		return 0;
+
+	/* Shasta and K2 seem to have "issues" with reads ... */
+	if (priv->kind == controller_sh_ata6 || priv->kind == controller_k2_ata6) {
+		/* Allright these are bad, apply restrictions */
+		blk_queue_update_dma_alignment(sdev->request_queue, 15);
+		blk_queue_update_dma_pad(sdev->request_queue, 15);
+
+		/* We enable MWI and hack cache line size directly here, this
+		 * is specific to this chipset and not normal values, we happen
+		 * to somewhat know what we are doing here (which is basically
+		 * to do the same Apple does and pray they did not get it wrong :-)
+		 */
+		BUG_ON(!priv->pdev);
+		pci_write_config_byte(priv->pdev, PCI_CACHE_LINE_SIZE, 0x08);
+		pci_read_config_word(priv->pdev, PCI_COMMAND, &cmd);
+		pci_write_config_word(priv->pdev, PCI_COMMAND,
+				      cmd | PCI_COMMAND_INVALIDATE);
+
+		/* Tell the world about it */
+		ata_dev_printk(dev, KERN_INFO,
+			       "K2/Shasta alignment limits applied\n");
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int pata_macio_do_suspend(struct pata_macio_priv *priv, pm_message_t mesg)
+{
+	int rc;
+
+	/* First, core libata suspend to do most of the work */
+	rc = ata_host_suspend(priv->host, mesg);
+	if (rc)
+		return rc;
+
+	/* Restore to default timings */
+	pata_macio_default_timings(priv);
+
+	/* Mask interrupt. Not strictly necessary but old driver did
+	 * it and I'd rather not change that here */
+	disable_irq(priv->irq);
+
+	/* The media bay will handle itself just fine */
+	if (priv->mediabay)
+		return 0;
+
+	/* Kauai has bus control FCRs directly here */
+	if (priv->kauai_fcr) {
+		u32 fcr = readl(priv->kauai_fcr);
+		fcr &= ~(KAUAI_FCR_UATA_RESET_N | KAUAI_FCR_UATA_ENABLE);
+		writel(fcr, priv->kauai_fcr);
+	}
+
+	/* For PCI, save state and disable DMA. No need to call
+	 * pci_set_power_state(), the HW doesn't do D states that
+	 * way, the platform code will take care of suspending the
+	 * ASIC properly
+	 */
+	if (priv->pdev) {
+		pci_save_state(priv->pdev);
+		pci_disable_device(priv->pdev);
+	}
+
+	/* Disable the bus on older machines and the cell on kauai */
+	ppc_md.feature_call(PMAC_FTR_IDE_ENABLE, priv->node,
+			    priv->aapl_bus_id, 0);
+
+	return 0;
+}
+
+static int pata_macio_do_resume(struct pata_macio_priv *priv)
+{
+	/* Reset and re-enable the HW */
+	pata_macio_reset_hw(priv, 1);
+
+	/* Sanitize drive timings */
+	pata_macio_apply_timings(priv->host->ports[0], 0);
+
+	/* We want our IRQ back ! */
+	enable_irq(priv->irq);
+
+	/* Let the libata core take it from there */
+	ata_host_resume(priv->host);
+
+	return 0;
+}
+
+#endif /* CONFIG_PM */
+
+static struct scsi_host_template pata_macio_sht = {
+	ATA_BASE_SHT(DRV_NAME),
+	.sg_tablesize		= MAX_DCMDS,
+	/* We may not need that strict one */
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.slave_configure	= pata_macio_slave_config,
+};
+
+static struct ata_port_operations pata_macio_ops = {
+	.inherits		= &ata_sff_port_ops,
+
+	.freeze			= pata_macio_freeze,
+	.set_piomode		= pata_macio_set_timings,
+	.set_dmamode		= pata_macio_set_timings,
+	.cable_detect		= pata_macio_cable_detect,
+	.sff_dev_select		= pata_macio_dev_select,
+	.qc_prep		= pata_macio_qc_prep,
+	.mode_filter		= ata_bmdma_mode_filter,
+	.bmdma_setup		= pata_macio_bmdma_setup,
+	.bmdma_start		= pata_macio_bmdma_start,
+	.bmdma_stop		= pata_macio_bmdma_stop,
+	.bmdma_status		= pata_macio_bmdma_status,
+	.port_start		= pata_macio_port_start,
+	.sff_irq_clear		= pata_macio_irq_clear,
+};
+
+static void __devinit pata_macio_invariants(struct pata_macio_priv *priv)
+{
+	const int *bidp;
+
+	/* Identify the type of controller */
+	if (of_device_is_compatible(priv->node, "shasta-ata")) {
+		priv->kind = controller_sh_ata6;
+	        priv->timings = pata_macio_shasta_timings;
+	} else if (of_device_is_compatible(priv->node, "kauai-ata")) {
+		priv->kind = controller_un_ata6;
+	        priv->timings = pata_macio_kauai_timings;
+	} else if (of_device_is_compatible(priv->node, "K2-UATA")) {
+		priv->kind = controller_k2_ata6;
+	        priv->timings = pata_macio_kauai_timings;
+	} else if (of_device_is_compatible(priv->node, "keylargo-ata")) {
+		if (strcmp(priv->node->name, "ata-4") == 0) {
+			priv->kind = controller_kl_ata4;
+			priv->timings = pata_macio_kl66_timings;
+		} else {
+			priv->kind = controller_kl_ata3;
+			priv->timings = pata_macio_kl33_timings;
+		}
+	} else if (of_device_is_compatible(priv->node, "heathrow-ata")) {
+		priv->kind = controller_heathrow;
+		priv->timings = pata_macio_heathrow_timings;
+	} else {
+		priv->kind = controller_ohare;
+		priv->timings = pata_macio_ohare_timings;
+	}
+
+	/* XXX FIXME --- setup priv->mediabay here */
+
+	/* Get Apple bus ID (for clock and ASIC control) */
+	bidp = of_get_property(priv->node, "AAPL,bus-id", NULL);
+	priv->aapl_bus_id =  bidp ? *bidp : 0;
+
+	/* Fixup missing Apple bus ID in case of media-bay */
+	if (priv->mediabay && bidp == 0)
+		priv->aapl_bus_id = 1;
+}
+
+static void __devinit pata_macio_setup_ios(struct ata_ioports *ioaddr,
+					   void __iomem * base,
+					   void __iomem * dma)
+{
+	/* cmd_addr is the base of regs for that port */
+	ioaddr->cmd_addr	= base;
+
+	/* taskfile registers */
+	ioaddr->data_addr	= base + (ATA_REG_DATA    << 4);
+	ioaddr->error_addr	= base + (ATA_REG_ERR     << 4);
+	ioaddr->feature_addr	= base + (ATA_REG_FEATURE << 4);
+	ioaddr->nsect_addr	= base + (ATA_REG_NSECT   << 4);
+	ioaddr->lbal_addr	= base + (ATA_REG_LBAL    << 4);
+	ioaddr->lbam_addr	= base + (ATA_REG_LBAM    << 4);
+	ioaddr->lbah_addr	= base + (ATA_REG_LBAH    << 4);
+	ioaddr->device_addr	= base + (ATA_REG_DEVICE  << 4);
+	ioaddr->status_addr	= base + (ATA_REG_STATUS  << 4);
+	ioaddr->command_addr	= base + (ATA_REG_CMD     << 4);
+	ioaddr->altstatus_addr	= base + 0x160;
+	ioaddr->ctl_addr	= base + 0x160;
+	ioaddr->bmdma_addr	= dma;
+}
+
+static void __devinit pmac_macio_calc_timing_masks(struct pata_macio_priv *priv,
+						   struct ata_port_info   *pinfo)
+{
+	int i = 0;
+
+	pinfo->pio_mask		= 0;
+	pinfo->mwdma_mask	= 0;
+	pinfo->udma_mask	= 0;
+
+	while (priv->timings[i].mode > 0) {
+		unsigned int mask = 1U << (priv->timings[i].mode & 0x0f);
+		switch(priv->timings[i].mode & 0xf0) {
+		case 0x00: /* PIO */
+			pinfo->pio_mask |= (mask >> 8);
+			break;
+		case 0x20: /* MWDMA */
+			pinfo->mwdma_mask |= mask;
+			break;
+		case 0x40: /* UDMA */
+			pinfo->udma_mask |= mask;
+			break;
+		}
+		i++;
+	}
+	dev_dbg(priv->dev, "Supported masks: PIO=%lx, MWDMA=%lx, UDMA=%lx\n",
+		pinfo->pio_mask, pinfo->mwdma_mask, pinfo->udma_mask);
+}
+
+static int __devinit pata_macio_common_init(struct pata_macio_priv	*priv,
+					    resource_size_t		tfregs,
+					    resource_size_t		dmaregs,
+					    resource_size_t		fcregs,
+					    unsigned long		irq)
+{
+	struct ata_port_info		pinfo;
+	const struct ata_port_info	*ppi[] = { &pinfo, NULL };
+	void __iomem			*dma_regs = NULL;
+
+	/* Fill up privates with various invariants collected from the
+	 * device-tree
+	 */
+	pata_macio_invariants(priv);
+
+	/* Make sure we have sane initial timings in the cache */
+	pata_macio_default_timings(priv);
+
+	/* Not sure what the real max is but we know it's less than 64K, let's
+	 * use 64K minus 256
+	 */
+	dma_set_max_seg_size(priv->dev, MAX_DBDMA_SEG);
+
+	/* Allocate libata host for 1 port */
+	memset(&pinfo, 0, sizeof(struct ata_port_info));
+	pmac_macio_calc_timing_masks(priv, &pinfo);
+	pinfo.flags		= ATA_FLAG_SLAVE_POSS | ATA_FLAG_MMIO |
+				  ATA_FLAG_NO_LEGACY;
+	pinfo.port_ops		= &pata_macio_ops;
+	pinfo.private_data	= priv;
+
+	priv->host = ata_host_alloc_pinfo(priv->dev, ppi, 1);
+	if (priv->host == NULL) {
+		dev_err(priv->dev, "Failed to allocate ATA port structure\n");
+		return -ENOMEM;
+	}
+
+	/* Setup the private data in host too */
+	priv->host->private_data = priv;
+
+	/* Map base registers */
+	priv->tfregs = devm_ioremap(priv->dev, tfregs, 0x100);
+	if (priv->tfregs == NULL) {
+		dev_err(priv->dev, "Failed to map ATA ports\n");
+		return -ENOMEM;
+	}
+	priv->host->iomap = &priv->tfregs;
+
+	/* Map DMA regs */
+	if (dmaregs != 0) {
+		dma_regs = devm_ioremap(priv->dev, dmaregs,
+					sizeof(struct dbdma_regs));
+		if (dma_regs == NULL)
+			dev_warn(priv->dev, "Failed to map ATA DMA registers\n");
+	}
+
+	/* If chip has local feature control, map those regs too */
+	if (fcregs != 0) {
+		priv->kauai_fcr = devm_ioremap(priv->dev, fcregs, 4);
+		if (priv->kauai_fcr == NULL) {
+			dev_err(priv->dev, "Failed to map ATA FCR register\n");
+			return -ENOMEM;
+		}
+	}
+
+	/* Setup port data structure */
+	pata_macio_setup_ios(&priv->host->ports[0]->ioaddr,
+			     priv->tfregs, dma_regs);
+	priv->host->ports[0]->private_data = priv;
+
+	/* hard-reset the controller */
+	pata_macio_reset_hw(priv, 0);
+	pata_macio_apply_timings(priv->host->ports[0], 0);
+
+	/* Enable bus master if necessary */
+	if (priv->pdev && dma_regs)
+		pci_set_master(priv->pdev);
+
+	dev_info(priv->dev, "Activating pata-macio chipset %s, Apple bus ID %d\n",
+		 macio_ata_names[priv->kind], priv->aapl_bus_id);
+
+	/* Start it up */
+	priv->irq = irq;
+	return ata_host_activate(priv->host, irq, ata_sff_interrupt, 0,
+				 &pata_macio_sht);
+}
+
+static int __devinit pata_macio_attach(struct macio_dev *mdev,
+				       const struct of_device_id *match)
+{
+	struct pata_macio_priv	*priv;
+	resource_size_t		tfregs, dmaregs = 0;
+	unsigned long		irq;
+	int			rc;
+
+	/* Check for broken device-trees */
+	if (macio_resource_count(mdev) == 0) {
+		dev_err(&mdev->ofdev.dev,
+			"No addresses for controller\n");
+		return -ENXIO;
+	}
+
+	/* Enable managed resources */
+	macio_enable_devres(mdev);
+
+	/* Allocate and init private data structure */
+	priv = devm_kzalloc(&mdev->ofdev.dev,
+			    sizeof(struct pata_macio_priv), GFP_KERNEL);
+	if (priv == NULL) {
+		dev_err(&mdev->ofdev.dev,
+			"Failed to allocate private memory\n");
+		return -ENOMEM;
+	}
+	priv->node = of_node_get(mdev->ofdev.node);
+	priv->mdev = mdev;
+	priv->dev = &mdev->ofdev.dev;
+
+	/* Request memory resource for taskfile registers */
+	if (macio_request_resource(mdev, 0, "pata-macio")) {
+		dev_err(&mdev->ofdev.dev,
+			"Cannot obtain taskfile resource\n");
+		return -EBUSY;
+	}
+	tfregs = macio_resource_start(mdev, 0);
+
+	/* Request resources for DMA registers if any */
+	if (macio_resource_count(mdev) >= 2) {
+		if (macio_request_resource(mdev, 1, "pata-macio-dma"))
+			dev_err(&mdev->ofdev.dev,
+				"Cannot obtain DMA resource\n");
+		else
+			dmaregs = macio_resource_start(mdev, 1);
+	}
+
+	/*
+	 * Fixup missing IRQ for some old implementations with broken
+	 * device-trees.
+	 *
+	 * This is a bit bogus, it should be fixed in the device-tree itself,
+	 * via the existing macio fixups, based on the type of interrupt
+	 * controller in the machine. However, I have no test HW for this case,
+	 * and this trick works well enough on those old machines...
+	 */
+	if (macio_irq_count(mdev) == 0) {
+		dev_warn(&mdev->ofdev.dev,
+			 "No interrupts for controller, using 13\n");
+		irq = irq_create_mapping(NULL, 13);
+	} else
+		irq = macio_irq(mdev, 0);
+
+	/* Prevvent media bay callbacks until fully registered */
+	lock_media_bay(priv->mdev->media_bay);
+
+	/* Get register addresses and call common initialization */
+	rc = pata_macio_common_init(priv,
+				    tfregs,		/* Taskfile regs */
+				    dmaregs,		/* DBDMA regs */
+				    0,			/* Feature control */
+				    irq);
+	unlock_media_bay(priv->mdev->media_bay);
+
+	return rc;
+}
+
+static int __devexit pata_macio_detach(struct macio_dev *mdev)
+{
+	struct ata_host *host = macio_get_drvdata(mdev);
+	struct pata_macio_priv *priv = host->private_data;
+
+	lock_media_bay(priv->mdev->media_bay);
+
+	/* Make sure the mediabay callback doesn't try to access
+	 * dead stuff
+	 */
+	priv->host->private_data = NULL;
+
+	ata_host_detach(host);
+
+	unlock_media_bay(priv->mdev->media_bay);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int pata_macio_suspend(struct macio_dev *mdev, pm_message_t mesg)
+{
+	struct ata_host *host = macio_get_drvdata(mdev);
+
+	return pata_macio_do_suspend(host->private_data, mesg);
+}
+
+static int pata_macio_resume(struct macio_dev *mdev)
+{
+	struct ata_host *host = macio_get_drvdata(mdev);
+
+	return pata_macio_do_resume(host->private_data);
+}
+
+#endif /* CONFIG_PM */
+
+#ifdef CONFIG_PMAC_MEDIABAY
+static void pata_macio_mb_event(struct macio_dev* mdev, int mb_state)
+{
+	struct ata_host *host = macio_get_drvdata(mdev);
+	struct ata_port *ap;
+	struct ata_eh_info *ehi;
+	struct ata_device *dev;
+	unsigned long flags;
+
+	if (!host || !host->private_data)
+		return;
+	ap = host->ports[0];
+	spin_lock_irqsave(ap->lock, flags);
+	ehi = &ap->link.eh_info;
+	if (mb_state == MB_CD) {
+		ata_ehi_push_desc(ehi, "mediabay plug");
+		ata_ehi_hotplugged(ehi);
+		ata_port_freeze(ap);
+	} else {
+		ata_ehi_push_desc(ehi, "mediabay unplug");
+		ata_for_each_dev(dev, &ap->link, ALL)
+			dev->flags |= ATA_DFLAG_DETACH;
+		ata_port_abort(ap);
+	}
+	spin_unlock_irqrestore(ap->lock, flags);
+
+}
+#endif /* CONFIG_PMAC_MEDIABAY */
+
+
+static int __devinit pata_macio_pci_attach(struct pci_dev *pdev,
+					   const struct pci_device_id *id)
+{
+	struct pata_macio_priv	*priv;
+	struct device_node	*np;
+	resource_size_t		rbase;
+
+	/* We cannot use a MacIO controller without its OF device node */
+	np = pci_device_to_OF_node(pdev);
+	if (np == NULL) {
+		dev_err(&pdev->dev,
+			"Cannot find OF device node for controller\n");
+		return -ENODEV;
+	}
+
+	/* Check that it can be enabled */
+	if (pcim_enable_device(pdev)) {
+		dev_err(&pdev->dev,
+			"Cannot enable controller PCI device\n");
+		return -ENXIO;
+	}
+
+	/* Allocate and init private data structure */
+	priv = devm_kzalloc(&pdev->dev,
+			    sizeof(struct pata_macio_priv), GFP_KERNEL);
+	if (priv == NULL) {
+		dev_err(&pdev->dev,
+			"Failed to allocate private memory\n");
+		return -ENOMEM;
+	}
+	priv->node = of_node_get(np);
+	priv->pdev = pdev;
+	priv->dev = &pdev->dev;
+
+	/* Get MMIO regions */
+	if (pci_request_regions(pdev, "pata-macio")) {
+		dev_err(&pdev->dev,
+			"Cannot obtain PCI resources\n");
+		return -EBUSY;
+	}
+
+	/* Get register addresses and call common initialization */
+	rbase = pci_resource_start(pdev, 0);
+	if (pata_macio_common_init(priv,
+				   rbase + 0x2000,	/* Taskfile regs */
+				   rbase + 0x1000,	/* DBDMA regs */
+				   rbase,		/* Feature control */
+				   pdev->irq))
+		return -ENXIO;
+
+	return 0;
+}
+
+static void __devexit pata_macio_pci_detach(struct pci_dev *pdev)
+{
+	struct ata_host *host = dev_get_drvdata(&pdev->dev);
+
+	ata_host_detach(host);
+}
+
+#ifdef CONFIG_PM
+
+static int pata_macio_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
+{
+	struct ata_host *host = dev_get_drvdata(&pdev->dev);
+
+	return pata_macio_do_suspend(host->private_data, mesg);
+}
+
+static int pata_macio_pci_resume(struct pci_dev *pdev)
+{
+	struct ata_host *host = dev_get_drvdata(&pdev->dev);
+
+	return pata_macio_do_resume(host->private_data);
+}
+
+#endif /* CONFIG_PM */
+
+static struct of_device_id pata_macio_match[] =
+{
+	{
+	.name 		= "IDE",
+	},
+	{
+	.name 		= "ATA",
+	},
+	{
+	.type		= "ide",
+	},
+	{
+	.type		= "ata",
+	},
+	{},
+};
+
+static struct macio_driver pata_macio_driver =
+{
+	.name 		= "pata-macio",
+	.match_table	= pata_macio_match,
+	.probe		= pata_macio_attach,
+	.remove		= pata_macio_detach,
+#ifdef CONFIG_PM
+	.suspend	= pata_macio_suspend,
+	.resume		= pata_macio_resume,
+#endif
+#ifdef CONFIG_PMAC_MEDIABAY
+	.mediabay_event	= pata_macio_mb_event,
+#endif
+	.driver = {
+		.owner		= THIS_MODULE,
+	},
+};
+
+static const struct pci_device_id pata_macio_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 pata_macio_pci_driver = {
+	.name		= "pata-pci-macio",
+	.id_table	= pata_macio_pci_match,
+	.probe		= pata_macio_pci_attach,
+	.remove		= pata_macio_pci_detach,
+#ifdef CONFIG_PM
+	.suspend	= pata_macio_pci_suspend,
+	.resume		= pata_macio_pci_resume,
+#endif
+	.driver = {
+		.owner		= THIS_MODULE,
+	},
+};
+MODULE_DEVICE_TABLE(pci, pata_macio_pci_match);
+
+
+static int __init pata_macio_init(void)
+{
+	int rc;
+
+	if (!machine_is(powermac))
+		return -ENODEV;
+
+	rc = pci_register_driver(&pata_macio_pci_driver);
+	if (rc)
+		return rc;
+	rc = macio_register_driver(&pata_macio_driver);
+	if (rc) {
+		pci_unregister_driver(&pata_macio_pci_driver);
+		return rc;
+	}
+	return 0;
+}
+
+static void __exit pata_macio_exit(void)
+{
+	macio_unregister_driver(&pata_macio_driver);
+	pci_unregister_driver(&pata_macio_pci_driver);
+}
+
+module_init(pata_macio_init);
+module_exit(pata_macio_exit);
+
+MODULE_AUTHOR("Benjamin Herrenschmidt");
+MODULE_DESCRIPTION("Apple MacIO PATA driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);