26 files changed, 260 insertions, 193 deletions

diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index 49234e32fd16..5d134bb75ba1 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -1023,7 +1023,7 @@ config BLK_DEV_4DRIVES
 config BLK_DEV_ALI14XX
         tristate "ALI M14xx support"
         help
-          This driver is enabled at runtime using the "ide0=ali14xx" kernel
+          This driver is enabled at runtime using the "ali14xx.probe" kernel
           boot parameter.  It enables support for the secondary IDE interface
           of the ALI M1439/1443/1445/1487/1489 chipsets, and permits faster
           I/O speeds to be set as well.  See the files
@@ -1033,7 +1033,7 @@ config BLK_DEV_ALI14XX
 config BLK_DEV_DTC2278
         tristate "DTC-2278 support"
         help
-          This driver is enabled at runtime using the "ide0=dtc2278" kernel
+          This driver is enabled at runtime using the "dtc2278.probe" kernel
           boot parameter. It enables support for the secondary IDE interface
           of the DTC-2278 card, and permits faster I/O speeds to be set as
           well. See the <file:Documentation/ide.txt> and
@@ -1042,7 +1042,7 @@ config BLK_DEV_DTC2278
 config BLK_DEV_HT6560B
         tristate "Holtek HT6560B support"
         help
-          This driver is enabled at runtime using the "ide0=ht6560b" kernel
+          This driver is enabled at runtime using the "ht6560b.probe" kernel
           boot parameter. It enables support for the secondary IDE interface
           of the Holtek card, and permits faster I/O speeds to be set as well.
           See the <file:Documentation/ide.txt> and
@@ -1051,7 +1051,7 @@ config BLK_DEV_HT6560B
 config BLK_DEV_QD65XX
         tristate "QDI QD65xx support"
         help
-          This driver is enabled at runtime using the "ide0=qd65xx" kernel
+          This driver is enabled at runtime using the "qd65xx.probe" kernel
           boot parameter.  It permits faster I/O speeds to be set.  See the
           <file:Documentation/ide.txt> and <file:drivers/ide/legacy/qd65xx.c> for
           more info.
@@ -1059,7 +1059,7 @@ config BLK_DEV_QD65XX
 config BLK_DEV_UMC8672
         tristate "UMC-8672 support"
         help
-          This driver is enabled at runtime using the "ide0=umc8672" kernel
+          This driver is enabled at runtime using the "umc8672.probe" kernel
           boot parameter. It enables support for the secondary IDE interface
           of the UMC-8672, and permits faster I/O speeds to be set as well.
           See the files <file:Documentation/ide.txt> and
diff --git a/drivers/ide/cris/ide-cris.c b/drivers/ide/cris/ide-cris.c
index 6b2d152351b3..556455fbfa2b 100644
--- a/drivers/ide/cris/ide-cris.c
+++ b/drivers/ide/cris/ide-cris.c
@@ -17,8 +17,6 @@
  * device can't do DMA handshaking for some stupid reason. We don't need to do that.
  */
 
-#undef REALLY_SLOW_IO           /* most systems can safely undef this */
-
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/timer.h>
diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index e2cea1889c4d..37aa6ddd9702 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -43,8 +43,6 @@
 
 #define IDEDISK_VERSION "1.18"
 
-#undef REALLY_SLOW_IO           /* most systems can safely undef this */
-
 //#define DEBUG
 
 #include <linux/module.h>
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index c67b3b1e6f4c..bd513f5a2323 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -583,6 +583,8 @@ u8 eighty_ninty_three (ide_drive_t *drive)
         if(!(drive->id->hw_config & 0x4000))
                 return 0;
 #endif /* CONFIG_IDEDMA_IVB */
+        if (!(drive->id->hw_config & 0x2000))
+                return 0;
         return 1;
 }
 
diff --git a/drivers/ide/ide-lib.c b/drivers/ide/ide-lib.c
index 8afce4ceea31..68719314df3f 100644
--- a/drivers/ide/ide-lib.c
+++ b/drivers/ide/ide-lib.c
@@ -345,16 +345,16 @@ static int ide_scan_pio_blacklist (char *model)
 
 /**
  *      ide_get_best_pio_mode   -       get PIO mode from drive
- *      @driver: drive to consider
+ *      @drive: drive to consider
  *      @mode_wanted: preferred mode
- *      @max_mode: highest allowed
- *      @d: pio data
+ *      @max_mode: highest allowed mode
+ *      @d: PIO data
  *
  *      This routine returns the recommended PIO settings for a given drive,
  *      based on the drive->id information and the ide_pio_blacklist[].
- *      This is used by most chipset support modules when "auto-tuning".
  *
- *      Drive PIO mode auto selection
+ *      Drive PIO mode is auto-selected if 255 is passed as mode_wanted.
+ *      This is used by most chipset support modules when "auto-tuning".
  */
 
 u8 ide_get_best_pio_mode (ide_drive_t *drive, u8 mode_wanted, u8 max_mode, ide_pio_data_t *d)
@@ -367,6 +367,7 @@ u8 ide_get_best_pio_mode (ide_drive_t *drive, u8 mode_wanted, u8 max_mode, ide_p
 
         if (mode_wanted != 255) {
                 pio_mode = mode_wanted;
+                use_iordy = (pio_mode > 2);
         } else if (!drive->id) {
                 pio_mode = 0;
         } else if ((pio_mode = ide_scan_pio_blacklist(id->model)) != -1) {
@@ -396,19 +397,12 @@ u8 ide_get_best_pio_mode (ide_drive_t *drive, u8 mode_wanted, u8 max_mode, ide_p
                         }
                 }
 
-#if 0
-                if (drive->id->major_rev_num & 0x0004) printk("ATA-2 ");
-#endif
-
                 /*
                  * Conservative "downgrade" for all pre-ATA2 drives
                  */
                 if (pio_mode && pio_mode < 4) {
                         pio_mode--;
                         overridden = 1;
-#if 0
-                        use_iordy = (pio_mode > 2);
-#endif
                         if (cycle_time && cycle_time < ide_pio_timings[pio_mode].cycle_time)
                                 cycle_time = 0; /* use standard timing */
                 }
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 8afbd6cb94be..8f15c23aa70d 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -31,8 +31,6 @@
  *                      valid after probe time even with noprobe
  */
 
-#undef REALLY_SLOW_IO           /* most systems can safely undef this */
-
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/string.h>
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index b3c0818c5c6c..dfbd74458522 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -126,8 +126,6 @@
 #define REVISION        "Revision: 7.00alpha2"
 #define VERSION         "Id: ide.c 7.00a2 20020906"
 
-#undef REALLY_SLOW_IO           /* most systems can safely undef this */
-
 #define _IDE_C                  /* Tell ide.h it's really us */
 
 #include <linux/module.h>
@@ -1486,23 +1484,23 @@ static int __init match_parm (char *s, const char *keywords[], int vals[], int m
 }
 
 #ifdef CONFIG_BLK_DEV_ALI14XX
-static int __initdata probe_ali14xx;
+extern int probe_ali14xx;
 extern int ali14xx_init(void);
 #endif
 #ifdef CONFIG_BLK_DEV_UMC8672
-static int __initdata probe_umc8672;
+extern int probe_umc8672;
 extern int umc8672_init(void);
 #endif
 #ifdef CONFIG_BLK_DEV_DTC2278
-static int __initdata probe_dtc2278;
+extern int probe_dtc2278;
 extern int dtc2278_init(void);
 #endif
 #ifdef CONFIG_BLK_DEV_HT6560B
-static int __initdata probe_ht6560b;
+extern int probe_ht6560b;
 extern int ht6560b_init(void);
 #endif
 #ifdef CONFIG_BLK_DEV_QD65XX
-static int __initdata probe_qd65xx;
+extern int probe_qd65xx;
 extern int qd65xx_init(void);
 #endif
 
@@ -1580,7 +1578,7 @@ static int __init ide_setup(char *s)
          */
         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
                 const char *hd_words[] = {
-                        "none", "noprobe", "nowerr", "cdrom", "serialize",
+                        "none", "noprobe", "nowerr", "cdrom", "minus5",
                         "autotune", "noautotune", "minus8", "swapdata", "bswap",
                         "noflush", "remap", "remap63", "scsi", NULL };
                 unit = s[2] - 'a';
@@ -1608,9 +1606,6 @@ static int __init ide_setup(char *s)
                                 drive->ready_stat = 0;
                                 hwif->noprobe = 0;
                                 goto done;
-                        case -5: /* "serialize" */
-                                printk(" -- USE \"ide%d=serialize\" INSTEAD", hw);
-                                goto do_serialize;
                         case -6: /* "autotune" */
                                 drive->autotune = IDE_TUNE_AUTO;
                                 goto obsolete_option;
@@ -1671,7 +1666,7 @@ static int __init ide_setup(char *s)
                  * (-8, -9, -10) are reserved to ease the hardcoding.
                  */
                 static const char *ide_words[] = {
-                        "noprobe", "serialize", "autotune", "noautotune", 
+                        "noprobe", "serialize", "minus3", "minus4",
                         "reset", "dma", "ata66", "minus8", "minus9",
                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
                         "dtc2278", "umc8672", "ali14xx", NULL };
@@ -1742,12 +1737,17 @@ static int __init ide_setup(char *s)
                                 hwif->chipset = mate->chipset = ide_4drives;
                                 mate->irq = hwif->irq;
                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
-                                goto do_serialize;
+                                hwif->mate = mate;
+                                mate->mate = hwif;
+                                hwif->serialized = mate->serialized = 1;
+                                goto obsolete_option;
                         }
 #endif /* CONFIG_BLK_DEV_4DRIVES */
                         case -10: /* minus10 */
                         case -9: /* minus9 */
                         case -8: /* minus8 */
+                        case -4:
+                        case -3:
                                 goto bad_option;
                         case -7: /* ata66 */
 #ifdef CONFIG_BLK_DEV_IDEPCI
@@ -1762,16 +1762,7 @@ static int __init ide_setup(char *s)
                         case -5: /* "reset" */
                                 hwif->reset = 1;
                                 goto obsolete_option;
-                        case -4: /* "noautotune" */
-                                hwif->drives[0].autotune = IDE_TUNE_NOAUTO;
-                                hwif->drives[1].autotune = IDE_TUNE_NOAUTO;
-                                goto obsolete_option;
-                        case -3: /* "autotune" */
-                                hwif->drives[0].autotune = IDE_TUNE_AUTO;
-                                hwif->drives[1].autotune = IDE_TUNE_AUTO;
-                                goto obsolete_option;
                         case -2: /* "serialize" */
-                        do_serialize:
                                 hwif->mate = &ide_hwifs[hw^1];
                                 hwif->mate->mate = hwif;
                                 hwif->serialized = hwif->mate->serialized = 1;
@@ -1840,8 +1831,8 @@ static void __init probe_for_hwifs (void)
 #endif /* CONFIG_BLK_DEV_CMD640 */
 #ifdef CONFIG_BLK_DEV_IDE_PMAC
         {
-                extern void pmac_ide_probe(void);
-                pmac_ide_probe();
+                extern int pmac_ide_probe(void);
+                (void)pmac_ide_probe();
         }
 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
 #ifdef CONFIG_BLK_DEV_GAYLE
diff --git a/drivers/ide/legacy/ali14xx.c b/drivers/ide/legacy/ali14xx.c
index 9c544467cb74..91961aa03047 100644
--- a/drivers/ide/legacy/ali14xx.c
+++ b/drivers/ide/legacy/ali14xx.c
@@ -37,8 +37,6 @@
  * mode 4 for a while now with no trouble.)  -Derek
  */
 
-#undef REALLY_SLOW_IO           /* most systems can safely undef this */
-
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
@@ -230,9 +228,17 @@ static int __init ali14xx_probe(void)
         return 0;
 }
 
+int probe_ali14xx = 0;
+
+module_param_named(probe, probe_ali14xx, bool, 0);
+MODULE_PARM_DESC(probe, "probe for ALI M14xx chipsets");
+
 /* Can be called directly from ide.c. */
 int __init ali14xx_init(void)
 {
+        if (probe_ali14xx == 0)
+                goto out;
+
         /* auto-detect IDE controller port */
         if (findPort()) {
                 if (ali14xx_probe())
@@ -240,6 +246,7 @@ int __init ali14xx_init(void)
                 return 0;
         }
         printk(KERN_ERR "ali14xx: not found.\n");
+out:
         return -ENODEV;
 }
 
diff --git a/drivers/ide/legacy/dtc2278.c b/drivers/ide/legacy/dtc2278.c
index 3b1d33baaa2f..0219ffa64db6 100644
--- a/drivers/ide/legacy/dtc2278.c
+++ b/drivers/ide/legacy/dtc2278.c
@@ -4,8 +4,6 @@
  *  Copyright (C) 1996  Linus Torvalds & author (see below)
  */
 
-#undef REALLY_SLOW_IO           /* most systems can safely undef this */
-
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
@@ -94,7 +92,7 @@ static void tune_dtc2278 (ide_drive_t *drive, u8 pio)
         HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1;
 }
 
-static int __init probe_dtc2278(void)
+static int __init dtc2278_probe(void)
 {
         unsigned long flags;
         ide_hwif_t *hwif, *mate;
@@ -145,10 +143,18 @@ static int __init probe_dtc2278(void)
         return 0;
 }
 
+int probe_dtc2278 = 0;
+
+module_param_named(probe, probe_dtc2278, bool, 0);
+MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets");
+
 /* Can be called directly from ide.c. */
 int __init dtc2278_init(void)
 {
-        if (probe_dtc2278()) {
+        if (probe_dtc2278 == 0)
+                return -ENODEV;
+
+        if (dtc2278_probe()) {
                 printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
                 return -EBUSY;
         }
diff --git a/drivers/ide/legacy/ht6560b.c b/drivers/ide/legacy/ht6560b.c
index 19ccd006f205..a2832643c522 100644
--- a/drivers/ide/legacy/ht6560b.c
+++ b/drivers/ide/legacy/ht6560b.c
@@ -36,8 +36,6 @@
 
 #define HT6560B_VERSION "v0.07"
 
-#undef REALLY_SLOW_IO           /* most systems can safely undef this */
-
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
@@ -303,12 +301,20 @@ static void tune_ht6560b (ide_drive_t *drive, u8 pio)
 #endif
 }
 
+int probe_ht6560b = 0;
+
+module_param_named(probe, probe_ht6560b, bool, 0);
+MODULE_PARM_DESC(probe, "probe for HT6560B chipset");
+
 /* Can be called directly from ide.c. */
 int __init ht6560b_init(void)
 {
         ide_hwif_t *hwif, *mate;
         int t;
 
+        if (probe_ht6560b == 0)
+                return -ENODEV;
+
         hwif = &ide_hwifs[0];
         mate = &ide_hwifs[1];
 
diff --git a/drivers/ide/legacy/ide-cs.c b/drivers/ide/legacy/ide-cs.c
index a5023cdbdc58..b08c37c9f956 100644
--- a/drivers/ide/legacy/ide-cs.c
+++ b/drivers/ide/legacy/ide-cs.c
@@ -359,14 +359,17 @@ void ide_release(struct pcmcia_device *link)
 static struct pcmcia_device_id ide_ids[] = {
         PCMCIA_DEVICE_FUNC_ID(4),
         PCMCIA_DEVICE_MANF_CARD(0x0007, 0x0000),        /* Hitachi */
+        PCMCIA_DEVICE_MANF_CARD(0x000a, 0x0000),        /* I-O Data CFA */
+        PCMCIA_DEVICE_MANF_CARD(0x001c, 0x0001),        /* Mitsubishi CFA */
         PCMCIA_DEVICE_MANF_CARD(0x0032, 0x0704),
-        PCMCIA_DEVICE_MANF_CARD(0x0045, 0x0401),
+        PCMCIA_DEVICE_MANF_CARD(0x0045, 0x0401),        /* SanDisk CFA */
         PCMCIA_DEVICE_MANF_CARD(0x0098, 0x0000),        /* Toshiba */
         PCMCIA_DEVICE_MANF_CARD(0x00a4, 0x002d),
         PCMCIA_DEVICE_MANF_CARD(0x00ce, 0x0000),        /* Samsung */
         PCMCIA_DEVICE_MANF_CARD(0x0319, 0x0000),        /* Hitachi */
         PCMCIA_DEVICE_MANF_CARD(0x2080, 0x0001),
-        PCMCIA_DEVICE_MANF_CARD(0x4e01, 0x0200),        /* Lexar */
+        PCMCIA_DEVICE_MANF_CARD(0x4e01, 0x0100),        /* Viking CFA */
+        PCMCIA_DEVICE_MANF_CARD(0x4e01, 0x0200),        /* Lexar, Viking CFA */
         PCMCIA_DEVICE_PROD_ID123("Caravelle", "PSC-IDE ", "PSC000", 0x8c36137c, 0xd0693ab8, 0x2768a9f0),
         PCMCIA_DEVICE_PROD_ID123("CDROM", "IDE", "MCD-601p", 0x1b9179ca, 0xede88951, 0x0d902f74),
         PCMCIA_DEVICE_PROD_ID123("PCMCIA", "IDE CARD", "F1", 0x281f1c5d, 0x1907960c, 0xf7fde8b9),
diff --git a/drivers/ide/legacy/qd65xx.c b/drivers/ide/legacy/qd65xx.c
index d3c3bc2640e7..2fb8f50f1293 100644
--- a/drivers/ide/legacy/qd65xx.c
+++ b/drivers/ide/legacy/qd65xx.c
@@ -16,8 +16,8 @@
  * Please set local bus speed using kernel parameter idebus
  *      for example, "idebus=33" stands for 33Mhz VLbus
  * To activate controller support, use "ide0=qd65xx"
- * To enable tuning, use "ide0=autotune"
- * To enable second channel tuning (qd6580 only), use "ide1=autotune"
+ * To enable tuning, use "hda=autotune hdb=autotune"
+ * To enable 2nd channel tuning (qd6580 only), use "hdc=autotune hdd=autotune"
  */
 
 /*
@@ -25,8 +25,6 @@
  * Samuel Thibault <samuel.thibault@fnac.net>
  */
 
-#undef REALLY_SLOW_IO           /* most systems can safely undef this */
-
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
@@ -490,9 +488,17 @@ static int __init qd_probe(int base)
         return 1;
 }
 
+int probe_qd65xx = 0;
+
+module_param_named(probe, probe_qd65xx, bool, 0);
+MODULE_PARM_DESC(probe, "probe for QD65xx chipsets");
+
 /* Can be called directly from ide.c. */
 int __init qd65xx_init(void)
 {
+        if (probe_qd65xx == 0)
+                return -ENODEV;
+
         if (qd_probe(0x30))
                 qd_probe(0xb0);
         if (ide_hwifs[0].chipset != ide_qd65xx &&
diff --git a/drivers/ide/legacy/umc8672.c b/drivers/ide/legacy/umc8672.c
index 6e2c58c5f6a2..ca7974455578 100644
--- a/drivers/ide/legacy/umc8672.c
+++ b/drivers/ide/legacy/umc8672.c
@@ -165,12 +165,21 @@ static int __init umc8672_probe(void)
         return 0;
 }
 
+int probe_umc8672 = 0;
+
+module_param_named(probe, probe_umc8672, bool, 0);
+MODULE_PARM_DESC(probe, "probe for UMC8672 chipset");
+
 /* Can be called directly from ide.c. */
 int __init umc8672_init(void)
 {
-        if (umc8672_probe())
-                return -ENODEV;
-        return 0;
+        if (probe_umc8672 == 0)
+                goto out;
+
+        if (umc8672_probe() == 0)
+                return 0;;
+out:
+        return -ENODEV;;
 }
 
 #ifdef MODULE
diff --git a/drivers/ide/mips/au1xxx-ide.c b/drivers/ide/mips/au1xxx-ide.c
index 0a59d5ef1599..b2dc028dc8ca 100644
--- a/drivers/ide/mips/au1xxx-ide.c
+++ b/drivers/ide/mips/au1xxx-ide.c
@@ -29,8 +29,6 @@
  * Note: for more information, please refer "AMD Alchemy Au1200/Au1550 IDE
  *       Interface and Linux Device Driver" Application Note.
  */
-#undef REALLY_SLOW_IO           /* most systems can safely undef this */
-
 #include <linux/types.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
diff --git a/drivers/ide/pci/alim15x3.c b/drivers/ide/pci/alim15x3.c
index 4debd18d52f8..83e0aa65a431 100644
--- a/drivers/ide/pci/alim15x3.c
+++ b/drivers/ide/pci/alim15x3.c
@@ -1,5 +1,5 @@
 /*
- * linux/drivers/ide/pci/alim15x3.c             Version 0.17    2003/01/02
+ * linux/drivers/ide/pci/alim15x3.c             Version 0.21    2007/02/03
  *
  *  Copyright (C) 1998-2000 Michel Aubry, Maintainer
  *  Copyright (C) 1998-2000 Andrzej Krzysztofowicz, Maintainer
@@ -9,6 +9,7 @@
  *  May be copied or modified under the terms of the GNU General Public License
  *  Copyright (C) 2002 Alan Cox <alan@redhat.com>
  *  ALi (now ULi M5228) support by Clear Zhang <Clear.Zhang@ali.com.tw>
+ *  Copyright (C) 2007 MontaVista Software, Inc. <source@mvista.com>
  *
  *  (U)DMA capable version of ali 1533/1543(C), 1535(D)
  *
@@ -280,15 +281,17 @@ static int ali_get_info (char *buffer, char **addr, off_t offset, int count)
 #endif  /* defined(DISPLAY_ALI_TIMINGS) && defined(CONFIG_PROC_FS) */
 
 /**
- *      ali15x3_tune_drive      -       set up a drive
+ *      ali15x3_tune_pio        -       set up chipset for PIO mode
  *      @drive: drive to tune
- *      @pio: unused
+ *      @pio: desired mode
  *
- *      Select the best PIO timing for the drive in question. Then
- *      program the controller for this drive set up
+ *      Select the best PIO mode for the drive in question.
+ *      Then program the controller for this mode.
+ *
+ *      Returns the PIO mode programmed.
  */
  
-static void ali15x3_tune_drive (ide_drive_t *drive, u8 pio)
+static u8 ali15x3_tune_pio (ide_drive_t *drive, u8 pio)
 {
         ide_pio_data_t d;
         ide_hwif_t *hwif = HWIF(drive);
@@ -356,6 +359,22 @@ static void ali15x3_tune_drive (ide_drive_t *drive, u8 pio)
          * { 20,   50,     30  }    PIO Mode 5 with IORDY (nonstandard)
          */
 
+        return pio;
+}
+
+/**
+ *      ali15x3_tune_drive      -       set up drive for PIO mode
+ *      @drive: drive to tune
+ *      @pio: desired mode
+ *
+ *      Program the controller with the best PIO timing for the given drive.
+ *      Then set up the drive itself.
+ */
+
+static void ali15x3_tune_drive (ide_drive_t *drive, u8 pio)
+{
+        pio = ali15x3_tune_pio(drive, pio);
+        (void) ide_config_drive_speed(drive, XFER_PIO_0 + pio);
 }
 
 /**
@@ -430,7 +449,7 @@ static u8 ali15x3_ratemask (ide_drive_t *drive)
 }
 
 /**
- *      ali15x3_tune_chipset    -       set up chiset for new speed
+ *      ali15x3_tune_chipset    -       set up chipset/drive for new speed
  *      @drive: drive to configure for
  *      @xferspeed: desired speed
  *
@@ -461,7 +480,7 @@ static int ali15x3_tune_chipset (ide_drive_t *drive, u8 xferspeed)
                 pci_write_config_byte(dev, m5229_udma, tmpbyte);
 
                 if (speed < XFER_SW_DMA_0)
-                        ali15x3_tune_drive(drive, speed);
+                        (void) ali15x3_tune_pio(drive, speed - XFER_PIO_0);
         } else {
                 pci_read_config_byte(dev, m5229_udma, &tmpbyte);
                 tmpbyte &= (0x0f << ((1-unit) << 2));
diff --git a/drivers/ide/pci/cmd640.c b/drivers/ide/pci/cmd640.c
index 61b5f9c0b2f4..dc43f009acab 100644
--- a/drivers/ide/pci/cmd640.c
+++ b/drivers/ide/pci/cmd640.c
@@ -98,7 +98,6 @@
  *                       (patch courtesy of Zoltan Hidvegi)
  */
 
-#undef REALLY_SLOW_IO           /* most systems can safely undef this */
 #define CMD640_PREFETCH_MASKS 1
 
 //#define CMD640_DUMP_REGS
diff --git a/drivers/ide/pci/cmd64x.c b/drivers/ide/pci/cmd64x.c
index 49df27513da7..b0d4825c56a9 100644
--- a/drivers/ide/pci/cmd64x.c
+++ b/drivers/ide/pci/cmd64x.c
@@ -1,6 +1,6 @@
 /* $Id: cmd64x.c,v 1.21 2000/01/30 23:23:16
  *
- * linux/drivers/ide/pci/cmd64x.c               Version 1.30    Sept 10, 2002
+ * linux/drivers/ide/pci/cmd64x.c               Version 1.41    Feb 3, 2007
  *
  * cmd64x.c: Enable interrupts at initialization time on Ultra/PCI machines.
  *           Note, this driver is not used at all on other systems because
@@ -12,6 +12,7 @@
  * Copyright (C) 1998           David S. Miller (davem@redhat.com)
  *
  * Copyright (C) 1999-2002      Andre Hedrick <andre@linux-ide.org>
+ * Copyright (C) 2007           MontaVista Software, Inc. <source@mvista.com>
  */
 
 #include <linux/module.h>
@@ -262,43 +263,25 @@ static void program_drive_counts (ide_drive_t *drive, int setup_count, int activ
 }
 
 /*
- * Attempts to set the interface PIO mode.
- * The preferred method of selecting PIO modes (e.g. mode 4) is 
- * "echo 'piomode:4' > /proc/ide/hdx/settings".  Special cases are
- * 8: prefetch off, 9: prefetch on, 255: auto-select best mode.
- * Called with 255 at boot time.
+ * This routine selects drive's best PIO mode, calculates setup/active/recovery
+ * counts, and then writes them into the chipset registers.
  */
-
-static void cmd64x_tuneproc (ide_drive_t *drive, u8 mode_wanted)
+static u8 cmd64x_tune_pio (ide_drive_t *drive, u8 mode_wanted)
 {
         int setup_time, active_time, recovery_time;
         int clock_time, pio_mode, cycle_time;
         u8 recovery_count2, cycle_count;
         int setup_count, active_count, recovery_count;
         int bus_speed = system_bus_clock();
-        /*byte b;*/
         ide_pio_data_t  d;
 
-        switch (mode_wanted) {
-                case 8: /* set prefetch off */
-                case 9: /* set prefetch on */
-                        mode_wanted &= 1;
-                        /*set_prefetch_mode(index, mode_wanted);*/
-                        cmdprintk("%s: %sabled cmd640 prefetch\n",
-                                drive->name, mode_wanted ? "en" : "dis");
-                        return;
-        }
-
-        mode_wanted = ide_get_best_pio_mode (drive, mode_wanted, 5, &d);
-        pio_mode = d.pio_mode;
+        pio_mode = ide_get_best_pio_mode(drive, mode_wanted, 5, &d);
         cycle_time = d.cycle_time;
 
         /*
          * I copied all this complicated stuff from cmd640.c and made a few
          * minor changes.  For now I am just going to pray that it is correct.
          */
-        if (pio_mode > 5)
-                pio_mode = 5;
         setup_time  = ide_pio_timings[pio_mode].setup_time;
         active_time = ide_pio_timings[pio_mode].active_time;
         recovery_time = cycle_time - (setup_time + active_time);
@@ -320,22 +303,33 @@ static void cmd64x_tuneproc (ide_drive_t *drive, u8 mode_wanted)
         if (active_count > 16)
                 active_count = 16; /* maximum allowed by cmd646 */
 
-        /*
-         * In a perfect world, we might set the drive pio mode here
-         * (using WIN_SETFEATURE) before continuing.
-         *
-         * But we do not, because:
-         *      1) this is the wrong place to do it
-         *              (proper is do_special() in ide.c)
-         *      2) in practice this is rarely, if ever, necessary
-         */
         program_drive_counts (drive, setup_count, active_count, recovery_count);
 
-        cmdprintk("%s: selected cmd646 PIO mode%d : %d (%dns)%s, "
+        cmdprintk("%s: PIO mode wanted %d, selected %d (%dns)%s, "
                 "clocks=%d/%d/%d\n",
-                drive->name, pio_mode, mode_wanted, cycle_time,
+                drive->name, mode_wanted, pio_mode, cycle_time,
                 d.overridden ? " (overriding vendor mode)" : "",
                 setup_count, active_count, recovery_count);
+
+        return pio_mode;
+}
+
+/*
+ * Attempts to set drive's PIO mode.
+ * Special cases are 8: prefetch off, 9: prefetch on (both never worked),
+ * and 255: auto-select best mode (used at boot time).
+ */
+static void cmd64x_tune_drive (ide_drive_t *drive, u8 pio)
+{
+        /*
+         * Filter out the prefetch control values
+         * to prevent PIO5 from being programmed
+         */
+        if (pio == 8 || pio == 9)
+                return;
+
+        pio = cmd64x_tune_pio(drive, pio);
+        (void) ide_config_drive_speed(drive, XFER_PIO_0 + pio);
 }
 
 static u8 cmd64x_ratemask (ide_drive_t *drive)
@@ -387,22 +381,6 @@ static u8 cmd64x_ratemask (ide_drive_t *drive)
         return mode;
 }
 
-static void config_cmd64x_chipset_for_pio (ide_drive_t *drive, u8 set_speed)
-{
-        u8 speed        = 0x00;
-        u8 set_pio      = ide_get_best_pio_mode(drive, 4, 5, NULL);
-
-        cmd64x_tuneproc(drive, set_pio);
-        speed = XFER_PIO_0 + set_pio;
-        if (set_speed)
-                (void) ide_config_drive_speed(drive, speed);
-}
-
-static void config_chipset_for_pio (ide_drive_t *drive, u8 set_speed)
-{
-        config_cmd64x_chipset_for_pio(drive, set_speed);
-}
-
 static int cmd64x_tune_chipset (ide_drive_t *drive, u8 xferspeed)
 {
         ide_hwif_t *hwif        = HWIF(drive);
@@ -414,7 +392,7 @@ static int cmd64x_tune_chipset (ide_drive_t *drive, u8 xferspeed)
 
         u8 speed        = ide_rate_filter(cmd64x_ratemask(drive), xferspeed);
 
-        if (speed > XFER_PIO_4) {
+        if (speed >= XFER_SW_DMA_0) {
                 (void) pci_read_config_byte(dev, pciD, &regD);
                 (void) pci_read_config_byte(dev, pciU, &regU);
                 regD &= ~(unit ? 0x40 : 0x20);
@@ -438,17 +416,20 @@ static int cmd64x_tune_chipset (ide_drive_t *drive, u8 xferspeed)
                 case XFER_SW_DMA_2:     regD |= (unit ? 0x40 : 0x10); break;
                 case XFER_SW_DMA_1:     regD |= (unit ? 0x80 : 0x20); break;
                 case XFER_SW_DMA_0:     regD |= (unit ? 0xC0 : 0x30); break;
-                case XFER_PIO_4:        cmd64x_tuneproc(drive, 4); break;
-                case XFER_PIO_3:        cmd64x_tuneproc(drive, 3); break;
-                case XFER_PIO_2:        cmd64x_tuneproc(drive, 2); break;
-                case XFER_PIO_1:        cmd64x_tuneproc(drive, 1); break;
-                case XFER_PIO_0:        cmd64x_tuneproc(drive, 0); break;
+                case XFER_PIO_5:
+                case XFER_PIO_4:
+                case XFER_PIO_3:
+                case XFER_PIO_2:
+                case XFER_PIO_1:
+                case XFER_PIO_0:
+                        (void) cmd64x_tune_pio(drive, speed - XFER_PIO_0);
+                        break;
 
                 default:
                         return 1;
         }
 
-        if (speed > XFER_PIO_4) {
+        if (speed >= XFER_SW_DMA_0) {
                 (void) pci_write_config_byte(dev, pciU, regU);
                 regD |= (unit ? 0x40 : 0x20);
                 (void) pci_write_config_byte(dev, pciD, regD);
@@ -461,8 +442,6 @@ static int config_chipset_for_dma (ide_drive_t *drive)
 {
         u8 speed        = ide_dma_speed(drive, cmd64x_ratemask(drive));
 
-        config_chipset_for_pio(drive, !speed);
-
         if (!speed)
                 return 0;
 
@@ -478,7 +457,7 @@ static int cmd64x_config_drive_for_dma (ide_drive_t *drive)
                 return 0;
 
         if (ide_use_fast_pio(drive))
-                config_chipset_for_pio(drive, 1);
+                cmd64x_tune_drive(drive, 255);
 
         return -1;
 }
@@ -679,14 +658,13 @@ static void __devinit init_hwif_cmd64x(ide_hwif_t *hwif)
         pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
         class_rev &= 0xff;
 
-        hwif->tuneproc  = &cmd64x_tuneproc;
+        hwif->tuneproc  = &cmd64x_tune_drive;
         hwif->speedproc = &cmd64x_tune_chipset;
 
-        if (!hwif->dma_base) {
-                hwif->drives[0].autotune = 1;
-                hwif->drives[1].autotune = 1;
+        hwif->drives[0].autotune = hwif->drives[1].autotune = 1;
+
+        if (!hwif->dma_base)
                 return;
-        }
 
         hwif->atapi_dma = 1;
 
diff --git a/drivers/ide/pci/delkin_cb.c b/drivers/ide/pci/delkin_cb.c
index e2672fc65d30..d4b753e70119 100644
--- a/drivers/ide/pci/delkin_cb.c
+++ b/drivers/ide/pci/delkin_cb.c
@@ -122,7 +122,7 @@ static struct pci_driver driver = {
 static int
 delkin_cb_init (void)
 {
-        return pci_module_init(&driver);
+        return pci_register_driver(&driver);
 }
 
 static void
diff --git a/drivers/ide/pci/generic.c b/drivers/ide/pci/generic.c
index b408c6c517ea..f2c5a141ca10 100644
--- a/drivers/ide/pci/generic.c
+++ b/drivers/ide/pci/generic.c
@@ -21,8 +21,6 @@
  * are deemed to be part of the source code.
  */
 
-#undef REALLY_SLOW_IO           /* most systems can safely undef this */
-
 #include <linux/types.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
diff --git a/drivers/ide/pci/opti621.c b/drivers/ide/pci/opti621.c
index 9ca60dd2185e..aede7eee9246 100644
--- a/drivers/ide/pci/opti621.c
+++ b/drivers/ide/pci/opti621.c
@@ -57,7 +57,7 @@
  * There is a 25/33MHz switch in configuration
  * register, but driver is written for use at any frequency which get
  * (use idebus=xx to select PCI bus speed).
- * Use ide0=autotune for automatical tune of the PIO modes.
+ * Use hda=autotune and hdb=autotune for automatical tune of the PIO modes.
  * If you get strange results, do not use this and set PIO manually
  * by hdparm.
  *
@@ -87,7 +87,6 @@
  * 0.5 doesn't work.
  */
 
-#undef REALLY_SLOW_IO   /* most systems can safely undef this */
 #define OPTI621_DEBUG           /* define for debug messages */
 
 #include <linux/types.h>
diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c
index 569822f4cf55..061d300ab8be 100644
--- a/drivers/ide/pci/piix.c
+++ b/drivers/ide/pci/piix.c
@@ -1,10 +1,10 @@
 /*
- *  linux/drivers/ide/pci/piix.c        Version 0.46    December 3, 2006
+ *  linux/drivers/ide/pci/piix.c        Version 0.47    February 8, 2007
  *
  *  Copyright (C) 1998-1999 Andrzej Krzysztofowicz, Author and Maintainer
  *  Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>
  *  Copyright (C) 2003 Red Hat Inc <alan@redhat.com>
- *  Copyright (C) 2006 MontaVista Software, Inc. <source@mvista.com>
+ *  Copyright (C) 2006-2007 MontaVista Software, Inc. <source@mvista.com>
  *
  *  May be copied or modified under the terms of the GNU General Public License
  *
@@ -205,14 +205,13 @@ static u8 piix_dma_2_pio (u8 xfer_rate) {
 }
 
 /**
- *      piix_tune_drive         -       tune a drive attached to a PIIX
+ *      piix_tune_pio           -       tune PIIX for PIO mode
  *      @drive: drive to tune
  *      @pio: desired PIO mode
  *
- *      Set the interface PIO mode based upon  the settings done by AMI BIOS
- *      (might be useful if drive is not registered in CMOS for any reason).
+ *      Set the interface PIO mode based upon the settings done by AMI BIOS.
  */
-static void piix_tune_drive (ide_drive_t *drive, u8 pio)
+static void piix_tune_pio (ide_drive_t *drive, u8 pio)
 {
         ide_hwif_t *hwif        = HWIF(drive);
         struct pci_dev *dev     = hwif->pci_dev;
@@ -233,8 +232,6 @@ static void piix_tune_drive (ide_drive_t *drive, u8 pio)
                                         { 2, 1 },
                                         { 2, 3 }, };
 
-        pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
-
         /*
          * Master vs slave is synchronized above us but the slave register is
          * shared by the two hwifs so the corner case of two slave timeouts in
@@ -253,19 +250,20 @@ static void piix_tune_drive (ide_drive_t *drive, u8 pio)
                 master_data |=  0x4000;
                 master_data &= ~0x0070;
                 if (pio > 1) {
-                        /* enable PPE, IE and TIME */
-                        master_data = master_data | (control << 4);
+                        /* Set PPE, IE and TIME */
+                        master_data |= control << 4;
                 }
                 pci_read_config_byte(dev, slave_port, &slave_data);
-                slave_data = slave_data & (hwif->channel ? 0x0f : 0xf0);
-                slave_data = slave_data | (((timings[pio][0] << 2) | timings[pio][1]) << (hwif->channel ? 4 : 0));
+                slave_data &= hwif->channel ? 0x0f : 0xf0;
+                slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) <<
+                               (hwif->channel ? 4 : 0);
         } else {
                 master_data &= ~0x3307;
                 if (pio > 1) {
                         /* enable PPE, IE and TIME */
-                        master_data = master_data | control;
+                        master_data |= control;
                 }
-                master_data = master_data | (timings[pio][0] << 12) | (timings[pio][1] << 8);
+                master_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
         }
         pci_write_config_word(dev, master_port, master_data);
         if (is_slave)
@@ -274,6 +272,21 @@ static void piix_tune_drive (ide_drive_t *drive, u8 pio)
 }
 
 /**
+ *      piix_tune_drive         -       tune a drive attached to PIIX
+ *      @drive: drive to tune
+ *      @pio: desired PIO mode
+ *
+ *      Set the drive's PIO mode (might be useful if drive is not registered
+ *      in CMOS for any reason).
+ */
+static void piix_tune_drive (ide_drive_t *drive, u8 pio)
+{
+        pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
+        piix_tune_pio(drive, pio);
+        (void) ide_config_drive_speed(drive, XFER_PIO_0 + pio);
+}
+
+/**
  *      piix_tune_chipset       -       tune a PIIX interface
  *      @drive: IDE drive to tune
  *      @xferspeed: speed to configure
@@ -348,8 +361,8 @@ static int piix_tune_chipset (ide_drive_t *drive, u8 xferspeed)
                         pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
         }
 
-        piix_tune_drive(drive, piix_dma_2_pio(speed));
-        return (ide_config_drive_speed(drive, speed));
+        piix_tune_pio(drive, piix_dma_2_pio(speed));
+        return ide_config_drive_speed(drive, speed);
 }
 
 /**
@@ -392,9 +405,7 @@ static int piix_config_drive_xfer_rate (ide_drive_t *drive)
                 return 0;
 
         if (ide_use_fast_pio(drive))
-                /* Find best PIO mode. */
-                piix_tune_chipset(drive, XFER_PIO_0 +
-                                  ide_get_best_pio_mode(drive, 255, 4, NULL));
+                piix_tune_drive(drive, 255);
 
         return -1;
 }
diff --git a/drivers/ide/pci/rz1000.c b/drivers/ide/pci/rz1000.c
index c1855311052b..f8c954690142 100644
--- a/drivers/ide/pci/rz1000.c
+++ b/drivers/ide/pci/rz1000.c
@@ -15,8 +15,6 @@
  *  Dunno if this fixes both ports, or only the primary port (?).
  */
 
-#undef REALLY_SLOW_IO           /* most systems can safely undef this */
-
 #include <linux/types.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
diff --git a/drivers/ide/pci/siimage.c b/drivers/ide/pci/siimage.c
index 7b4c189a9d99..71eccdf5f817 100644
--- a/drivers/ide/pci/siimage.c
+++ b/drivers/ide/pci/siimage.c
@@ -26,6 +26,11 @@
  *      If you have strange problems with nVidia chipset systems please
  *      see the SI support documentation and update your system BIOS
  *      if neccessary
+ *
+ *  The Dell DRAC4 has some interesting features including effectively hot
+ *  unplugging/replugging the virtual CD interface when the DRAC is reset.
+ *  This often causes drivers/ide/siimage to panic but is ok with the rather
+ *  smarter code in libata.
  */
 
 #include <linux/types.h>
diff --git a/drivers/ide/pci/slc90e66.c b/drivers/ide/pci/slc90e66.c
index ae7eb58d961c..852ccb36da1d 100644
--- a/drivers/ide/pci/slc90e66.c
+++ b/drivers/ide/pci/slc90e66.c
@@ -1,8 +1,8 @@
 /*
- *  linux/drivers/ide/pci/slc90e66.c    Version 0.13    December 30, 2006
+ *  linux/drivers/ide/pci/slc90e66.c    Version 0.14    February 8, 2007
  *
  *  Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org>
- *  Copyright (C) 2006 MontaVista Software, Inc. <source@mvista.com>
+ *  Copyright (C) 2006-2007 MontaVista Software, Inc. <source@mvista.com>
  *
  * This is a look-alike variation of the ICH0 PIIX4 Ultra-66,
  * but this keeps the ISA-Bridge and slots alive.
@@ -57,11 +57,7 @@ static u8 slc90e66_dma_2_pio (u8 xfer_rate) {
         }
 }
 
-/*
- *  Based on settings done by AMI BIOS
- *  (might be useful if drive is not registered in CMOS for any reason).
- */
-static void slc90e66_tune_drive (ide_drive_t *drive, u8 pio)
+static void slc90e66_tune_pio (ide_drive_t *drive, u8 pio)
 {
         ide_hwif_t *hwif        = HWIF(drive);
         struct pci_dev *dev     = hwif->pci_dev;
@@ -80,7 +76,6 @@ static void slc90e66_tune_drive (ide_drive_t *drive, u8 pio)
                                         { 2, 1 },
                                         { 2, 3 }, };
 
-        pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
         spin_lock_irqsave(&ide_lock, flags);
         pci_read_config_word(dev, master_port, &master_data);
 
@@ -94,19 +89,20 @@ static void slc90e66_tune_drive (ide_drive_t *drive, u8 pio)
                 master_data |=  0x4000;
                 master_data &= ~0x0070;
                 if (pio > 1) {
-                        /* enable PPE, IE and TIME */
-                        master_data = master_data | (control << 4);
+                        /* Set PPE, IE and TIME */
+                        master_data |= control << 4;
                 }
                 pci_read_config_byte(dev, slave_port, &slave_data);
-                slave_data = slave_data & (hwif->channel ? 0x0f : 0xf0);
-                slave_data = slave_data | (((timings[pio][0] << 2) | timings[pio][1]) << (hwif->channel ? 4 : 0));
+                slave_data &= hwif->channel ? 0x0f : 0xf0;
+                slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) <<
+                               (hwif->channel ? 4 : 0);
         } else {
                 master_data &= ~0x3307;
                 if (pio > 1) {
                         /* enable PPE, IE and TIME */
-                        master_data = master_data | control;
+                        master_data |= control;
                 }
-                master_data = master_data | (timings[pio][0] << 12) | (timings[pio][1] << 8);
+                master_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
         }
         pci_write_config_word(dev, master_port, master_data);
         if (is_slave)
@@ -114,6 +110,13 @@ static void slc90e66_tune_drive (ide_drive_t *drive, u8 pio)
         spin_unlock_irqrestore(&ide_lock, flags);
 }
 
+static void slc90e66_tune_drive (ide_drive_t *drive, u8 pio)
+{
+        pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
+        slc90e66_tune_pio(drive, pio);
+        (void) ide_config_drive_speed(drive, XFER_PIO_0 + pio);
+}
+
 static int slc90e66_tune_chipset (ide_drive_t *drive, u8 xferspeed)
 {
         ide_hwif_t *hwif        = HWIF(drive);
@@ -162,8 +165,8 @@ static int slc90e66_tune_chipset (ide_drive_t *drive, u8 xferspeed)
                         pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
         }
 
-        slc90e66_tune_drive(drive, slc90e66_dma_2_pio(speed));
-        return (ide_config_drive_speed(drive, speed));
+        slc90e66_tune_pio(drive, slc90e66_dma_2_pio(speed));
+        return ide_config_drive_speed(drive, speed);
 }
 
 static int slc90e66_config_drive_for_dma (ide_drive_t *drive)
@@ -185,8 +188,7 @@ static int slc90e66_config_drive_xfer_rate (ide_drive_t *drive)
                 return 0;
 
         if (ide_use_fast_pio(drive))
-                (void)slc90e66_tune_chipset(drive, XFER_PIO_0 +
-                                ide_get_best_pio_mode(drive, 255, 4, NULL));
+                slc90e66_tune_drive(drive, 255);
 
         return -1;
 }
diff --git a/drivers/ide/ppc/pmac.c b/drivers/ide/ppc/pmac.c
index 395d35253d5d..071a030ec26e 100644
--- a/drivers/ide/ppc/pmac.c
+++ b/drivers/ide/ppc/pmac.c
@@ -48,7 +48,7 @@
 #include <asm/mediabay.h>
 #endif
 
-#include "ide-timing.h"
+#include "../ide-timing.h"
 
 #undef IDE_PMAC_DEBUG
 
@@ -1551,19 +1551,34 @@ static struct pci_driver pmac_ide_pci_driver = {
 };
 MODULE_DEVICE_TABLE(pci, pmac_ide_pci_match);
 
-void __init
-pmac_ide_probe(void)
+int __init pmac_ide_probe(void)
 {
+        int error;
+
         if (!machine_is(powermac))
-                return;
+                return -ENODEV;
 
 #ifdef CONFIG_BLK_DEV_IDE_PMAC_ATA100FIRST
-        pci_register_driver(&pmac_ide_pci_driver);
-        macio_register_driver(&pmac_ide_macio_driver);
+        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
-        macio_register_driver(&pmac_ide_macio_driver);
-        pci_register_driver(&pmac_ide_pci_driver);
+        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;
 }
 
 #ifdef CONFIG_BLK_DEV_IDEDMA_PMAC
@@ -1983,7 +1998,7 @@ static void pmac_ide_dma_host_off(ide_drive_t *drive)
 {
 }
 
-static int pmac_ide_dma_host_on(ide_drive_t *drive)
+static void pmac_ide_dma_host_on(ide_drive_t *drive)
 {
 }
 
diff --git a/drivers/ide/ppc/scc_pata.c b/drivers/ide/ppc/scc_pata.c
index de64b022478b..f84bf791f72e 100644
--- a/drivers/ide/ppc/scc_pata.c
+++ b/drivers/ide/ppc/scc_pata.c
@@ -509,6 +509,32 @@ static int scc_ide_dma_end(ide_drive_t * drive)
         return __ide_dma_end(drive);
 }
 
+/* returns 1 if dma irq issued, 0 otherwise */
+static int scc_dma_test_irq(ide_drive_t *drive)
+{
+        ide_hwif_t *hwif        = HWIF(drive);
+        u8 dma_stat             = hwif->INB(hwif->dma_status);
+
+        /* return 1 if INTR asserted */
+        if ((dma_stat & 4) == 4)
+                return 1;
+
+        /* Workaround for PTERADD: emulate DMA_INTR when
+         * - IDE_STATUS[ERR] = 1
+         * - INT_STATUS[INTRQ] = 1
+         * - DMA_STATUS[IORACTA] = 1
+         */
+        if (in_be32((void __iomem *)IDE_ALTSTATUS_REG) & ERR_STAT &&
+            in_be32((void __iomem *)(hwif->dma_base + 0x014)) & INTSTS_INTRQ &&
+                dma_stat & 1)
+                return 1;
+
+        if (!drive->waiting_for_dma)
+                printk(KERN_WARNING "%s: (%s) called while not waiting\n",
+                        drive->name, __FUNCTION__);
+        return 0;
+}
+
 /**
  *      setup_mmio_scc  -       map CTRL/BMID region
  *      @dev: PCI device we are configuring
@@ -712,6 +738,7 @@ static void __devinit init_hwif_scc(ide_hwif_t *hwif)
         hwif->speedproc = scc_tune_chipset;
         hwif->tuneproc = scc_tuneproc;
         hwif->ide_dma_check = scc_config_drive_for_dma;
+        hwif->ide_dma_test_irq = scc_dma_test_irq;
 
         hwif->drives[0].autotune = IDE_TUNE_AUTO;
         hwif->drives[1].autotune = IDE_TUNE_AUTO;