Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2208 insertions, 0 deletions

diff --git a/drivers/ide/ppc/pmac.c b/drivers/ide/ppc/pmac.c
new file mode 100644
index 00000000000..6dc273a8132
--- /dev/null
+++ b/drivers/ide/ppc/pmac.c
@@ -0,0 +1,2208 @@
+/*
+ * linux/drivers/ide/ide-pmac.c
+ *
+ * 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
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version
+ *  2 of the License, or (at your option) any later version.
+ *
+ * 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/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/ide.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/pci.h>
+#include <linux/adb.h>
+#include <linux/pmu.h>
+#include <linux/scatterlist.h>
+
+#include <asm/prom.h>
+#include <asm/io.h>
+#include <asm/dbdma.h>
+#include <asm/ide.h>
+#include <asm/pci-bridge.h>
+#include <asm/machdep.h>
+#include <asm/pmac_feature.h>
+#include <asm/sections.h>
+#include <asm/irq.h>
+
+#ifndef CONFIG_PPC64
+#include <asm/mediabay.h>
+#endif
+
+#include "ide-timing.h"
+
+#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			cable_80 : 1;
+	unsigned			mediabay : 1;
+	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;
+#ifdef CONFIG_BLK_DEV_IDEDMA_PMAC
+	/* 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;
+#endif
+	
+} pmac_ide_hwif_t;
+
+static pmac_ide_hwif_t pmac_ide[MAX_HWIFS] __pmacdata;
+static int pmac_ide_count;
+
+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
+
+#ifdef CONFIG_BLK_DEV_IDEDMA_PMAC
+
+/* 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[] __pmacdata =
+{
+    { 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[] __pmacdata =
+{
+    { 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[] __pmacdata =
+{
+    { 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[] __pmacdata =
+{
+    {   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[] __pmacdata =
+{
+	{ 930	, 0x08000fff },
+	{ 600	, 0x08000a92 },
+	{ 383	, 0x0800060f },
+	{ 360	, 0x08000492 },
+	{ 330	, 0x0800048f },
+	{ 300	, 0x080003cf },
+	{ 270	, 0x080003cc },
+	{ 240	, 0x0800038b },
+	{ 239	, 0x0800030c },
+	{ 180	, 0x05000249 },
+	{ 120	, 0x04000148 }
+};
+
+static struct kauai_timing	kauai_mdma_timings[] __pmacdata =
+{
+	{ 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[] __pmacdata =
+{
+	{ 120	, 0x000070c0 },
+	{ 90	, 0x00005d80 },
+	{ 60	, 0x00004a60 },
+	{ 45	, 0x00003a50 },
+	{ 30	, 0x00002a30 },
+	{ 20	, 0x00002921 },
+	{ 0	, 0 },
+};
+
+static struct kauai_timing	shasta_pio_timings[] __pmacdata =
+{
+	{ 930	, 0x08000fff },
+	{ 600	, 0x0A000c97 },
+	{ 383	, 0x07000712 },
+	{ 360	, 0x040003cd },
+	{ 330	, 0x040003cd },
+	{ 300	, 0x040003cd },
+	{ 270	, 0x040003cd },
+	{ 240	, 0x040003cd },
+	{ 239	, 0x040003cd },
+	{ 180	, 0x0400028b },
+	{ 120	, 0x0400010a }
+};
+
+static struct kauai_timing	shasta_mdma_timings[] __pmacdata =
+{
+	{ 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[] __pmacdata =
+{
+	{ 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;
+	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 void pmac_ide_setup_dma(pmac_ide_hwif_t *pmif, ide_hwif_t *hwif);
+static int pmac_ide_build_dmatable(ide_drive_t *drive, struct request *rq);
+static int pmac_ide_tune_chipset(ide_drive_t *drive, u8 speed);
+static void pmac_ide_tuneproc(ide_drive_t *drive, u8 pio);
+static void pmac_ide_selectproc(ide_drive_t *drive);
+static void pmac_ide_kauai_selectproc(ide_drive_t *drive);
+
+#endif /* CONFIG_BLK_DEV_IDEDMA_PMAC */
+
+/*
+ * Below is the code for blinking the laptop LED along with hard
+ * disk activity.
+ */
+
+#ifdef CONFIG_BLK_DEV_IDE_PMAC_BLINK
+
+/* Set to 50ms minimum led-on time (also used to limit frequency
+ * of requests sent to the PMU
+ */
+#define PMU_HD_BLINK_TIME	(HZ/50)
+
+static struct adb_request pmu_blink_on, pmu_blink_off;
+static spinlock_t pmu_blink_lock;
+static unsigned long pmu_blink_stoptime;
+static int pmu_blink_ledstate;
+static struct timer_list pmu_blink_timer;
+static int pmu_ide_blink_enabled;
+
+
+static void
+pmu_hd_blink_timeout(unsigned long data)
+{
+	unsigned long flags;
+	
+	spin_lock_irqsave(&pmu_blink_lock, flags);
+
+	/* We may have been triggered again in a racy way, check
+	 * that we really want to switch it off
+	 */
+	if (time_after(pmu_blink_stoptime, jiffies))
+		goto done;
+
+	/* Previous req. not complete, try 100ms more */
+	if (pmu_blink_off.complete == 0)
+		mod_timer(&pmu_blink_timer, jiffies + PMU_HD_BLINK_TIME);
+	else if (pmu_blink_ledstate) {
+		pmu_request(&pmu_blink_off, NULL, 4, 0xee, 4, 0, 0);
+		pmu_blink_ledstate = 0;
+	}
+done:
+	spin_unlock_irqrestore(&pmu_blink_lock, flags);
+}
+
+static void
+pmu_hd_kick_blink(void *data, int rw)
+{
+	unsigned long flags;
+	
+	pmu_blink_stoptime = jiffies + PMU_HD_BLINK_TIME;
+	wmb();
+	mod_timer(&pmu_blink_timer, pmu_blink_stoptime);
+	/* Fast path when LED is already ON */
+	if (pmu_blink_ledstate == 1)
+		return;
+	spin_lock_irqsave(&pmu_blink_lock, flags);
+	if (pmu_blink_on.complete && !pmu_blink_ledstate) {
+		pmu_request(&pmu_blink_on, NULL, 4, 0xee, 4, 0, 1);
+		pmu_blink_ledstate = 1;
+	}
+	spin_unlock_irqrestore(&pmu_blink_lock, flags);
+}
+
+static int
+pmu_hd_blink_init(void)
+{
+	struct device_node *dt;
+	const char *model;
+
+	/* Currently, I only enable this feature on KeyLargo based laptops,
+	 * older laptops may support it (at least heathrow/paddington) but
+	 * I don't feel like loading those venerable old machines with so
+	 * much additional interrupt & PMU activity...
+	 */
+	if (pmu_get_model() != PMU_KEYLARGO_BASED)
+		return 0;
+	
+	dt = find_devices("device-tree");
+	if (dt == NULL)
+		return 0;
+	model = (const char *)get_property(dt, "model", NULL);
+	if (model == NULL)
+		return 0;
+	if (strncmp(model, "PowerBook", strlen("PowerBook")) != 0 &&
+	    strncmp(model, "iBook", strlen("iBook")) != 0)
+	    	return 0;
+	
+	pmu_blink_on.complete = 1;
+	pmu_blink_off.complete = 1;
+	spin_lock_init(&pmu_blink_lock);
+	init_timer(&pmu_blink_timer);
+	pmu_blink_timer.function = pmu_hd_blink_timeout;
+
+	return 1;
+}
+
+#endif /* CONFIG_BLK_DEV_IDE_PMAC_BLINK */
+
+/*
+ * N.B. this can't be an initfunc, because the media-bay task can
+ * call ide_[un]register at any time.
+ */
+void __pmac
+pmac_ide_init_hwif_ports(hw_regs_t *hw,
+			      unsigned long data_port, unsigned long ctrl_port,
+			      int *irq)
+{
+	int i, ix;
+
+	if (data_port == 0)
+		return;
+
+	for (ix = 0; ix < MAX_HWIFS; ++ix)
+		if (data_port == pmac_ide[ix].regbase)
+			break;
+
+	if (ix >= MAX_HWIFS) {
+		/* Probably a PCI interface... */
+		for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; ++i)
+			hw->io_ports[i] = data_port + i - IDE_DATA_OFFSET;
+		hw->io_ports[IDE_CONTROL_OFFSET] = ctrl_port;
+		return;
+	}
+
+	for (i = 0; i < 8; ++i)
+		hw->io_ports[i] = data_port + i * 0x10;
+	hw->io_ports[8] = data_port + 0x160;
+
+	if (irq != NULL)
+		*irq = pmac_ide[ix].irq;
+}
+
+#define PMAC_IDE_REG(x) ((void __iomem *)(IDE_DATA_REG+(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
+pmac_ide_selectproc(ide_drive_t *drive)
+{
+	pmac_ide_hwif_t* pmif = (pmac_ide_hwif_t *)HWIF(drive)->hwif_data;
+
+	if (pmif == NULL)
+		return;
+
+	if (drive->select.b.unit & 0x01)
+		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
+pmac_ide_kauai_selectproc(ide_drive_t *drive)
+{
+	pmac_ide_hwif_t* pmif = (pmac_ide_hwif_t *)HWIF(drive)->hwif_data;
+
+	if (pmif == NULL)
+		return;
+
+	if (drive->select.b.unit & 0x01) {
+		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
+pmac_ide_do_update_timings(ide_drive_t *drive)
+{
+	pmac_ide_hwif_t* pmif = (pmac_ide_hwif_t *)HWIF(drive)->hwif_data;
+
+	if (pmif == NULL)
+		return;
+
+	if (pmif->kind == controller_sh_ata6 ||
+	    pmif->kind == controller_un_ata6 ||
+	    pmif->kind == controller_k2_ata6)
+		pmac_ide_kauai_selectproc(drive);
+	else
+		pmac_ide_selectproc(drive);
+}
+
+static void
+pmac_outbsync(ide_drive_t *drive, u8 value, unsigned long port)
+{
+	u32 tmp;
+	
+	writeb(value, (void __iomem *) port);
+	tmp = readl(PMAC_IDE_REG(IDE_TIMING_CONFIG));
+}
+
+/*
+ * Send the SET_FEATURE IDE command to the drive and update drive->id with
+ * the new state. We currently don't use the generic routine as it used to
+ * cause various trouble, especially with older mediabays.
+ * This code is sometimes triggering a spurrious interrupt though, I need
+ * to sort that out sooner or later and see if I can finally get the
+ * common version to work properly in all cases
+ */
+static int __pmac
+pmac_ide_do_setfeature(ide_drive_t *drive, u8 command)
+{
+	ide_hwif_t *hwif = HWIF(drive);
+	int result = 1;
+	
+	disable_irq_nosync(hwif->irq);
+	udelay(1);
+	SELECT_DRIVE(drive);
+	SELECT_MASK(drive, 0);
+	udelay(1);
+	/* Get rid of pending error state */
+	(void) hwif->INB(IDE_STATUS_REG);
+	/* Timeout bumped for some powerbooks */
+	if (wait_for_ready(drive, 2000)) {
+		/* Timeout bumped for some powerbooks */
+		printk(KERN_ERR "%s: pmac_ide_do_setfeature disk not ready "
+			"before SET_FEATURE!\n", drive->name);
+		goto out;
+	}
+	udelay(10);
+	hwif->OUTB(drive->ctl | 2, IDE_CONTROL_REG);
+	hwif->OUTB(command, IDE_NSECTOR_REG);
+	hwif->OUTB(SETFEATURES_XFER, IDE_FEATURE_REG);
+	hwif->OUTBSYNC(drive, WIN_SETFEATURES, IDE_COMMAND_REG);
+	udelay(1);
+	/* Timeout bumped for some powerbooks */
+	result = wait_for_ready(drive, 2000);
+	hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
+	if (result)
+		printk(KERN_ERR "%s: pmac_ide_do_setfeature disk not ready "
+			"after SET_FEATURE !\n", drive->name);
+out:
+	SELECT_MASK(drive, 0);
+	if (result == 0) {
+		drive->id->dma_ultra &= ~0xFF00;
+		drive->id->dma_mword &= ~0x0F00;
+		drive->id->dma_1word &= ~0x0F00;
+		switch(command) {
+			case XFER_UDMA_7:
+				drive->id->dma_ultra |= 0x8080; break;
+			case XFER_UDMA_6:
+				drive->id->dma_ultra |= 0x4040; break;
+			case XFER_UDMA_5:
+				drive->id->dma_ultra |= 0x2020; break;
+			case XFER_UDMA_4:
+				drive->id->dma_ultra |= 0x1010; break;
+			case XFER_UDMA_3:
+				drive->id->dma_ultra |= 0x0808; break;
+			case XFER_UDMA_2:
+				drive->id->dma_ultra |= 0x0404; break;
+			case XFER_UDMA_1:
+				drive->id->dma_ultra |= 0x0202; break;
+			case XFER_UDMA_0:
+				drive->id->dma_ultra |= 0x0101; break;
+			case XFER_MW_DMA_2:
+				drive->id->dma_mword |= 0x0404; break;
+			case XFER_MW_DMA_1:
+				drive->id->dma_mword |= 0x0202; break;
+			case XFER_MW_DMA_0:
+				drive->id->dma_mword |= 0x0101; break;
+			case XFER_SW_DMA_2:
+				drive->id->dma_1word |= 0x0404; break;
+			case XFER_SW_DMA_1:
+				drive->id->dma_1word |= 0x0202; break;
+			case XFER_SW_DMA_0:
+				drive->id->dma_1word |= 0x0101; break;
+			default: break;
+		}
+	}
+	enable_irq(hwif->irq);
+	return result;
+}
+
+/*
+ * Old tuning functions (called on hdparm -p), sets up drive PIO timings
+ */
+static void __pmac
+pmac_ide_tuneproc(ide_drive_t *drive, u8 pio)
+{
+	ide_pio_data_t d;
+	u32 *timings;
+	unsigned accessTicks, recTicks;
+	unsigned accessTime, recTime;
+	pmac_ide_hwif_t* pmif = (pmac_ide_hwif_t *)HWIF(drive)->hwif_data;
+	
+	if (pmif == NULL)
+		return;
+		
+	/* which drive is it ? */
+	timings = &pmif->timings[drive->select.b.unit & 0x01];
+
+	pio = ide_get_best_pio_mode(drive, pio, 4, &d);
+
+	switch (pmif->kind) {
+	case controller_sh_ata6: {
+		/* 133Mhz cell */
+		u32 tr = kauai_lookup_timing(shasta_pio_timings, d.cycle_time);
+		if (tr == 0)
+			return;
+		*timings = ((*timings) & ~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, d.cycle_time);
+		if (tr == 0)
+			return;
+		*timings = ((*timings) & ~TR_100_PIOREG_PIO_MASK) | tr;
+		break;
+		}
+	case controller_kl_ata4:
+		/* 66Mhz cell */
+		recTime = d.cycle_time - ide_pio_timings[pio].active_time
+				- ide_pio_timings[pio].setup_time;
+		recTime = max(recTime, 150U);
+		accessTime = ide_pio_timings[pio].active_time;
+		accessTime = max(accessTime, 150U);
+		accessTicks = SYSCLK_TICKS_66(accessTime);
+		accessTicks = min(accessTicks, 0x1fU);
+		recTicks = SYSCLK_TICKS_66(recTime);
+		recTicks = min(recTicks, 0x1fU);
+		*timings = ((*timings) & ~TR_66_PIO_MASK) |
+				(accessTicks << TR_66_PIO_ACCESS_SHIFT) |
+				(recTicks << TR_66_PIO_RECOVERY_SHIFT);
+		break;
+	default: {
+		/* 33Mhz cell */
+		int ebit = 0;
+		recTime = d.cycle_time - ide_pio_timings[pio].active_time
+				- ide_pio_timings[pio].setup_time;
+		recTime = max(recTime, 150U);
+		accessTime = ide_pio_timings[pio].active_time;
+		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;
+		}
+		*timings = ((*timings) & ~TR_33_PIO_MASK) |
+				(accessTicks << TR_33_PIO_ACCESS_SHIFT) |
+				(recTicks << TR_33_PIO_RECOVERY_SHIFT);
+		if (ebit)
+			*timings |= 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	
+
+	if (drive->select.all == HWIF(drive)->INB(IDE_SELECT_REG))
+		pmac_ide_do_update_timings(drive);
+}
+
+#ifdef CONFIG_BLK_DEV_IDEDMA_PMAC
+
+/*
+ * Calculate KeyLargo ATA/66 UDMA timings
+ */
+static int __pmac
+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 __pmac
+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);
+	if (tr == 0)
+		return 1;
+	*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 __pmac
+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);
+	if (tr == 0)
+		return 1;
+	*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 int __pmac
+set_timings_mdma(ide_drive_t *drive, int intf_type, u32 *timings, u32 *timings2,
+			u8 speed, int drive_cycle_time)
+{
+	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:
+			return 1;
+	}
+	/* Adjust for drive */
+	if (drive_cycle_time && drive_cycle_time > cycleTime)
+		cycleTime = drive_cycle_time;
+	/* 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++;
+		}
+		if (i < 0)
+			return 1;
+		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);
+		if (tr == 0)
+			return 1;
+		*timings = ((*timings) & ~TR_133_PIOREG_MDMA_MASK) | tr;
+		*timings2 = (*timings2) & ~TR_133_UDMAREG_UDMA_EN;
+		}
+	case controller_un_ata6:
+	case controller_k2_ata6: {
+		/* 100Mhz cell */
+		u32 tr = kauai_lookup_timing(kauai_mdma_timings, cycleTime);
+		if (tr == 0)
+			return 1;
+		*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	
+	return 0;
+}
+#endif /* #ifdef CONFIG_BLK_DEV_IDEDMA_PMAC */
+
+/* 
+ * Speedproc. This function is called by the core to set any of the standard
+ * timing (PIO, MDMA or UDMA) to both the drive and the controller.
+ * You may notice we don't use this function on normal "dma check" operation,
+ * our dedicated function is more precise as it uses the drive provided
+ * cycle time value. We should probably fix this one to deal with that too...
+ */
+static int __pmac
+pmac_ide_tune_chipset (ide_drive_t *drive, byte speed)
+{
+	int unit = (drive->select.b.unit & 0x01);
+	int ret = 0;
+	pmac_ide_hwif_t* pmif = (pmac_ide_hwif_t *)HWIF(drive)->hwif_data;
+	u32 *timings, *timings2;
+
+	if (pmif == NULL)
+		return 1;
+		
+	timings = &pmif->timings[unit];
+	timings2 = &pmif->timings[unit+2];
+	
+	switch(speed) {
+#ifdef CONFIG_BLK_DEV_IDEDMA_PMAC
+		case XFER_UDMA_6:
+		        if (pmif->kind != controller_sh_ata6)
+				return 1;
+		case XFER_UDMA_5:
+			if (pmif->kind != controller_un_ata6 &&
+			    pmif->kind != controller_k2_ata6 &&
+			    pmif->kind != controller_sh_ata6)
+				return 1;
+		case XFER_UDMA_4:
+		case XFER_UDMA_3:
+			if (HWIF(drive)->udma_four == 0)
+				return 1;		
+		case XFER_UDMA_2:
+		case XFER_UDMA_1:
+		case XFER_UDMA_0:
+			if (pmif->kind == controller_kl_ata4)
+				ret = set_timings_udma_ata4(timings, speed);
+			else if (pmif->kind == controller_un_ata6
+				 || pmif->kind == controller_k2_ata6)
+				ret = set_timings_udma_ata6(timings, timings2, speed);
+			else if (pmif->kind == controller_sh_ata6)
+				ret = set_timings_udma_shasta(timings, timings2, speed);
+			else
+				ret = 1;		
+			break;
+		case XFER_MW_DMA_2:
+		case XFER_MW_DMA_1:
+		case XFER_MW_DMA_0:
+			ret = set_timings_mdma(drive, pmif->kind, timings, timings2, speed, 0);
+			break;
+		case XFER_SW_DMA_2:
+		case XFER_SW_DMA_1:
+		case XFER_SW_DMA_0:
+			return 1;
+#endif /* CONFIG_BLK_DEV_IDEDMA_PMAC */
+		case XFER_PIO_4:
+		case XFER_PIO_3:
+		case XFER_PIO_2:
+		case XFER_PIO_1:
+		case XFER_PIO_0:
+			pmac_ide_tuneproc(drive, speed & 0x07);
+			break;
+		default:
+			ret = 1;
+	}
+	if (ret)
+		return ret;
+
+	ret = pmac_ide_do_setfeature(drive, speed);
+	if (ret)
+		return ret;
+		
+	pmac_ide_do_update_timings(drive);	
+	drive->current_speed = speed;
+
+	return 0;
+}
+
+/*
+ * Blast some well known "safe" values to the timing registers at init or
+ * wakeup from sleep time, before we do real calculation
+ */
+static void __pmac
+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;
+}
+
+unsigned long __pmac
+pmac_ide_get_base(int index)
+{
+	return pmac_ide[index].regbase;
+}
+
+int __pmac
+pmac_ide_check_base(unsigned long base)</