ide: move xfer mode tuning code to ide-xfer-mode.c

* Move xfer mode tuning code to ide-xfer-mode.c.

* Add CONFIG_IDE_XFER_MODE config option to be selected by host drivers
  that support xfer mode tuning.

* Add CONFIG_IDE_XFER_MODE=n static inline versions of ide_set_pio()
  and ide_set_xfer_rate().

* Make IDE_TIMINGS and BLK_DEV_IDEDMA config options select IDE_XFER_MODE,
  also add explicit selects for few host drivers that need it.

* Build/link ide-xfer-mode.o and ide-pio-blacklist.o (it is needed only
  by ide-xfer-mode.o) only if CONFIG_IDE_XFER_MODE=y.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

4 files changed, 256 insertions, 242 deletions

diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index 5ea3bfad172a..640c99207242 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -56,8 +56,12 @@ if IDE
 
 comment "Please see Documentation/ide/ide.txt for help/info on IDE drives"
 
+config IDE_XFER_MODE
+        bool
+
 config IDE_TIMINGS
         bool
+        select IDE_XFER_MODE
 
 config IDE_ATAPI
         bool
@@ -698,6 +702,7 @@ config BLK_DEV_IDE_PMAC_ATA100FIRST
 config BLK_DEV_IDE_AU1XXX
        bool "IDE for AMD Alchemy Au1200"
        depends on SOC_AU1200
+       select IDE_XFER_MODE
 choice
        prompt "IDE Mode for AMD Alchemy Au1200"
        default CONFIG_BLK_DEV_IDE_AU1XXX_PIO_DBDMA
@@ -871,6 +876,7 @@ config BLK_DEV_ALI14XX
 
 config BLK_DEV_DTC2278
         tristate "DTC-2278 support"
+        select IDE_XFER_MODE
         select IDE_LEGACY
         help
           This driver is enabled at runtime using the "dtc2278.probe" kernel
@@ -902,6 +908,7 @@ config BLK_DEV_QD65XX
 
 config BLK_DEV_UMC8672
         tristate "UMC-8672 support"
+        select IDE_XFER_MODE
         select IDE_LEGACY
         help
           This driver is enabled at runtime using the "umc8672.probe" kernel
@@ -915,5 +922,6 @@ endif
 config BLK_DEV_IDEDMA
         def_bool BLK_DEV_IDEDMA_SFF || \
                  BLK_DEV_IDEDMA_ICS || BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA
+        select IDE_XFER_MODE
 
 endif # IDE
diff --git a/drivers/ide/Makefile b/drivers/ide/Makefile
index 83a970ee4bfe..d0976e6ee090 100644
--- a/drivers/ide/Makefile
+++ b/drivers/ide/Makefile
@@ -5,10 +5,10 @@
 EXTRA_CFLAGS                            += -Idrivers/ide
 
 ide-core-y += ide.o ide-ioctls.o ide-io.o ide-iops.o ide-lib.o ide-probe.o \
-              ide-taskfile.o ide-pm.o ide-park.o ide-pio-blacklist.o \
-              ide-sysfs.o ide-devsets.o
+              ide-taskfile.o ide-pm.o ide-park.o ide-sysfs.o ide-devsets.o
 
 # core IDE code
+ide-core-$(CONFIG_IDE_XFER_MODE)        += ide-pio-blacklist.o ide-xfer-mode.o
 ide-core-$(CONFIG_IDE_TIMINGS)          += ide-timings.o
 ide-core-$(CONFIG_IDE_ATAPI)            += ide-atapi.o
 ide-core-$(CONFIG_BLK_DEV_IDEPCI)       += setup-pci.o
diff --git a/drivers/ide/ide-lib.c b/drivers/ide/ide-lib.c
index 09526a0de734..f6c683dd2987 100644
--- a/drivers/ide/ide-lib.c
+++ b/drivers/ide/ide-lib.c
@@ -5,163 +5,6 @@
 #include <linux/ide.h>
 #include <linux/bitops.h>
 
-static const char *udma_str[] =
-         { "UDMA/16", "UDMA/25",  "UDMA/33",  "UDMA/44",
-           "UDMA/66", "UDMA/100", "UDMA/133", "UDMA7" };
-static const char *mwdma_str[] =
-        { "MWDMA0", "MWDMA1", "MWDMA2" };
-static const char *swdma_str[] =
-        { "SWDMA0", "SWDMA1", "SWDMA2" };
-static const char *pio_str[] =
-        { "PIO0", "PIO1", "PIO2", "PIO3", "PIO4", "PIO5" };
-
-/**
- *      ide_xfer_verbose        -       return IDE mode names
- *      @mode: transfer mode
- *
- *      Returns a constant string giving the name of the mode
- *      requested.
- */
-
-const char *ide_xfer_verbose(u8 mode)
-{
-        const char *s;
-        u8 i = mode & 0xf;
-
-        if (mode >= XFER_UDMA_0 && mode <= XFER_UDMA_7)
-                s = udma_str[i];
-        else if (mode >= XFER_MW_DMA_0 && mode <= XFER_MW_DMA_2)
-                s = mwdma_str[i];
-        else if (mode >= XFER_SW_DMA_0 && mode <= XFER_SW_DMA_2)
-                s = swdma_str[i];
-        else if (mode >= XFER_PIO_0 && mode <= XFER_PIO_5)
-                s = pio_str[i & 0x7];
-        else if (mode == XFER_PIO_SLOW)
-                s = "PIO SLOW";
-        else
-                s = "XFER ERROR";
-
-        return s;
-}
-EXPORT_SYMBOL(ide_xfer_verbose);
-
-/**
- *      ide_rate_filter         -       filter transfer mode
- *      @drive: IDE device
- *      @speed: desired speed
- *
- *      Given the available transfer modes this function returns
- *      the best available speed at or below the speed requested.
- *
- *      TODO: check device PIO capabilities
- */
-
-static u8 ide_rate_filter(ide_drive_t *drive, u8 speed)
-{
-        ide_hwif_t *hwif = drive->hwif;
-        u8 mode = ide_find_dma_mode(drive, speed);
-
-        if (mode == 0) {
-                if (hwif->pio_mask)
-                        mode = fls(hwif->pio_mask) - 1 + XFER_PIO_0;
-                else
-                        mode = XFER_PIO_4;
-        }
-
-/*      printk("%s: mode 0x%02x, speed 0x%02x\n", __func__, mode, speed); */
-
-        return min(speed, mode);
-}
-
-/**
- *      ide_get_best_pio_mode   -       get PIO mode from drive
- *      @drive: drive to consider
- *      @mode_wanted: preferred mode
- *      @max_mode: highest allowed mode
- *
- *      This routine returns the recommended PIO settings for a given drive,
- *      based on the drive->id information and the ide_pio_blacklist[].
- *
- *      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)
-{
-        u16 *id = drive->id;
-        int pio_mode = -1, overridden = 0;
-
-        if (mode_wanted != 255)
-                return min_t(u8, mode_wanted, max_mode);
-
-        if ((drive->hwif->host_flags & IDE_HFLAG_PIO_NO_BLACKLIST) == 0)
-                pio_mode = ide_scan_pio_blacklist((char *)&id[ATA_ID_PROD]);
-
-        if (pio_mode != -1) {
-                printk(KERN_INFO "%s: is on PIO blacklist\n", drive->name);
-        } else {
-                pio_mode = id[ATA_ID_OLD_PIO_MODES] >> 8;
-                if (pio_mode > 2) {     /* 2 is maximum allowed tPIO value */
-                        pio_mode = 2;
-                        overridden = 1;
-                }
-
-                if (id[ATA_ID_FIELD_VALID] & 2) {             /* ATA2? */
-                        if (ata_id_has_iordy(id)) {
-                                if (id[ATA_ID_PIO_MODES] & 7) {
-                                        overridden = 0;
-                                        if (id[ATA_ID_PIO_MODES] & 4)
-                                                pio_mode = 5;
-                                        else if (id[ATA_ID_PIO_MODES] & 2)
-                                                pio_mode = 4;
-                                        else
-                                                pio_mode = 3;
-                                }
-                        }
-                }
-
-                if (overridden)
-                        printk(KERN_INFO "%s: tPIO > 2, assuming tPIO = 2\n",
-                                         drive->name);
-        }
-
-        if (pio_mode > max_mode)
-                pio_mode = max_mode;
-
-        return pio_mode;
-}
-EXPORT_SYMBOL_GPL(ide_get_best_pio_mode);
-
-/* req_pio == "255" for auto-tune */
-void ide_set_pio(ide_drive_t *drive, u8 req_pio)
-{
-        ide_hwif_t *hwif = drive->hwif;
-        const struct ide_port_ops *port_ops = hwif->port_ops;
-        u8 host_pio, pio;
-
-        if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
-            (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
-                return;
-
-        BUG_ON(hwif->pio_mask == 0x00);
-
-        host_pio = fls(hwif->pio_mask) - 1;
-
-        pio = ide_get_best_pio_mode(drive, req_pio, host_pio);
-
-        /*
-         * TODO:
-         * - report device max PIO mode
-         * - check req_pio != 255 against device max PIO mode
-         */
-        printk(KERN_DEBUG "%s: host max PIO%d wanted PIO%d%s selected PIO%d\n",
-                          drive->name, host_pio, req_pio,
-                          req_pio == 255 ? "(auto-tune)" : "", pio);
-
-        (void)ide_set_pio_mode(drive, XFER_PIO_0 + pio);
-}
-EXPORT_SYMBOL_GPL(ide_set_pio);
-
 /**
  *      ide_toggle_bounce       -       handle bounce buffering
  *      @drive: drive to update
@@ -188,89 +31,6 @@ void ide_toggle_bounce(ide_drive_t *drive, int on)
                 blk_queue_bounce_limit(drive->queue, addr);
 }
 
-int ide_set_pio_mode(ide_drive_t *drive, const u8 mode)
-{
-        ide_hwif_t *hwif = drive->hwif;
-        const struct ide_port_ops *port_ops = hwif->port_ops;
-
-        if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
-                return 0;
-
-        if (port_ops == NULL || port_ops->set_pio_mode == NULL)
-                return -1;
-
-        /*
-         * TODO: temporary hack for some legacy host drivers that didn't
-         * set transfer mode on the device in ->set_pio_mode method...
-         */
-        if (port_ops->set_dma_mode == NULL) {
-                port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
-                return 0;
-        }
-
-        if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
-                if (ide_config_drive_speed(drive, mode))
-                        return -1;
-                port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
-                return 0;
-        } else {
-                port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
-                return ide_config_drive_speed(drive, mode);
-        }
-}
-
-int ide_set_dma_mode(ide_drive_t *drive, const u8 mode)
-{
-        ide_hwif_t *hwif = drive->hwif;
-        const struct ide_port_ops *port_ops = hwif->port_ops;
-
-        if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
-                return 0;
-
-        if (port_ops == NULL || port_ops->set_dma_mode == NULL)
-                return -1;
-
-        if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
-                if (ide_config_drive_speed(drive, mode))
-                        return -1;
-                port_ops->set_dma_mode(drive, mode);
-                return 0;
-        } else {
-                port_ops->set_dma_mode(drive, mode);
-                return ide_config_drive_speed(drive, mode);
-        }
-}
-EXPORT_SYMBOL_GPL(ide_set_dma_mode);
-
-/**
- *      ide_set_xfer_rate       -       set transfer rate
- *      @drive: drive to set
- *      @rate: speed to attempt to set
- *
- *      General helper for setting the speed of an IDE device. This
- *      function knows about user enforced limits from the configuration
- *      which ->set_pio_mode/->set_dma_mode does not.
- */
-
-int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
-{
-        ide_hwif_t *hwif = drive->hwif;
-        const struct ide_port_ops *port_ops = hwif->port_ops;
-
-        if (port_ops == NULL || port_ops->set_dma_mode == NULL ||
-            (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
-                return -1;
-
-        rate = ide_rate_filter(drive, rate);
-
-        BUG_ON(rate < XFER_PIO_0);
-
-        if (rate >= XFER_PIO_0 && rate <= XFER_PIO_5)
-                return ide_set_pio_mode(drive, rate);
-
-        return ide_set_dma_mode(drive, rate);
-}
-
 static void ide_dump_opcode(ide_drive_t *drive)
 {
         struct request *rq = drive->hwif->rq;
diff --git a/drivers/ide/ide-xfer-mode.c b/drivers/ide/ide-xfer-mode.c
new file mode 100644
index 000000000000..6910f6a257e8
--- /dev/null
+++ b/drivers/ide/ide-xfer-mode.c
@@ -0,0 +1,246 @@
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/ide.h>
+#include <linux/bitops.h>
+
+static const char *udma_str[] =
+         { "UDMA/16", "UDMA/25",  "UDMA/33",  "UDMA/44",
+           "UDMA/66", "UDMA/100", "UDMA/133", "UDMA7" };
+static const char *mwdma_str[] =
+        { "MWDMA0", "MWDMA1", "MWDMA2" };
+static const char *swdma_str[] =
+        { "SWDMA0", "SWDMA1", "SWDMA2" };
+static const char *pio_str[] =
+        { "PIO0", "PIO1", "PIO2", "PIO3", "PIO4", "PIO5" };
+
+/**
+ *      ide_xfer_verbose        -       return IDE mode names
+ *      @mode: transfer mode
+ *
+ *      Returns a constant string giving the name of the mode
+ *      requested.
+ */
+
+const char *ide_xfer_verbose(u8 mode)
+{
+        const char *s;
+        u8 i = mode & 0xf;
+
+        if (mode >= XFER_UDMA_0 && mode <= XFER_UDMA_7)
+                s = udma_str[i];
+        else if (mode >= XFER_MW_DMA_0 && mode <= XFER_MW_DMA_2)
+                s = mwdma_str[i];
+        else if (mode >= XFER_SW_DMA_0 && mode <= XFER_SW_DMA_2)
+                s = swdma_str[i];
+        else if (mode >= XFER_PIO_0 && mode <= XFER_PIO_5)
+                s = pio_str[i & 0x7];
+        else if (mode == XFER_PIO_SLOW)
+                s = "PIO SLOW";
+        else
+                s = "XFER ERROR";
+
+        return s;
+}
+EXPORT_SYMBOL(ide_xfer_verbose);
+
+/**
+ *      ide_get_best_pio_mode   -       get PIO mode from drive
+ *      @drive: drive to consider
+ *      @mode_wanted: preferred mode
+ *      @max_mode: highest allowed mode
+ *
+ *      This routine returns the recommended PIO settings for a given drive,
+ *      based on the drive->id information and the ide_pio_blacklist[].
+ *
+ *      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)
+{
+        u16 *id = drive->id;
+        int pio_mode = -1, overridden = 0;
+
+        if (mode_wanted != 255)
+                return min_t(u8, mode_wanted, max_mode);
+
+        if ((drive->hwif->host_flags & IDE_HFLAG_PIO_NO_BLACKLIST) == 0)
+                pio_mode = ide_scan_pio_blacklist((char *)&id[ATA_ID_PROD]);
+
+        if (pio_mode != -1) {
+                printk(KERN_INFO "%s: is on PIO blacklist\n", drive->name);
+        } else {
+                pio_mode = id[ATA_ID_OLD_PIO_MODES] >> 8;
+                if (pio_mode > 2) {     /* 2 is maximum allowed tPIO value */
+                        pio_mode = 2;
+                        overridden = 1;
+                }
+
+                if (id[ATA_ID_FIELD_VALID] & 2) {             /* ATA2? */
+                        if (ata_id_has_iordy(id)) {
+                                if (id[ATA_ID_PIO_MODES] & 7) {
+                                        overridden = 0;
+                                        if (id[ATA_ID_PIO_MODES] & 4)
+                                                pio_mode = 5;
+                                        else if (id[ATA_ID_PIO_MODES] & 2)
+                                                pio_mode = 4;
+                                        else
+                                                pio_mode = 3;
+                                }
+                        }
+                }
+
+                if (overridden)
+                        printk(KERN_INFO "%s: tPIO > 2, assuming tPIO = 2\n",
+                                         drive->name);
+        }
+
+        if (pio_mode > max_mode)
+                pio_mode = max_mode;
+
+        return pio_mode;
+}
+EXPORT_SYMBOL_GPL(ide_get_best_pio_mode);
+
+int ide_set_pio_mode(ide_drive_t *drive, const u8 mode)
+{
+        ide_hwif_t *hwif = drive->hwif;
+        const struct ide_port_ops *port_ops = hwif->port_ops;
+
+        if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
+                return 0;
+
+        if (port_ops == NULL || port_ops->set_pio_mode == NULL)
+                return -1;
+
+        /*
+         * TODO: temporary hack for some legacy host drivers that didn't
+         * set transfer mode on the device in ->set_pio_mode method...
+         */
+        if (port_ops->set_dma_mode == NULL) {
+                port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
+                return 0;
+        }
+
+        if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
+                if (ide_config_drive_speed(drive, mode))
+                        return -1;
+                port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
+                return 0;
+        } else {
+                port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
+                return ide_config_drive_speed(drive, mode);
+        }
+}
+
+int ide_set_dma_mode(ide_drive_t *drive, const u8 mode)
+{
+        ide_hwif_t *hwif = drive->hwif;
+        const struct ide_port_ops *port_ops = hwif->port_ops;
+
+        if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
+                return 0;
+
+        if (port_ops == NULL || port_ops->set_dma_mode == NULL)
+                return -1;
+
+        if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
+                if (ide_config_drive_speed(drive, mode))
+                        return -1;
+                port_ops->set_dma_mode(drive, mode);
+                return 0;
+        } else {
+                port_ops->set_dma_mode(drive, mode);
+                return ide_config_drive_speed(drive, mode);
+        }
+}
+EXPORT_SYMBOL_GPL(ide_set_dma_mode);
+
+/* req_pio == "255" for auto-tune */
+void ide_set_pio(ide_drive_t *drive, u8 req_pio)
+{
+        ide_hwif_t *hwif = drive->hwif;
+        const struct ide_port_ops *port_ops = hwif->port_ops;
+        u8 host_pio, pio;
+
+        if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
+            (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
+                return;
+
+        BUG_ON(hwif->pio_mask == 0x00);
+
+        host_pio = fls(hwif->pio_mask) - 1;
+
+        pio = ide_get_best_pio_mode(drive, req_pio, host_pio);
+
+        /*
+         * TODO:
+         * - report device max PIO mode
+         * - check req_pio != 255 against device max PIO mode
+         */
+        printk(KERN_DEBUG "%s: host max PIO%d wanted PIO%d%s selected PIO%d\n",
+                          drive->name, host_pio, req_pio,
+                          req_pio == 255 ? "(auto-tune)" : "", pio);
+
+        (void)ide_set_pio_mode(drive, XFER_PIO_0 + pio);
+}
+EXPORT_SYMBOL_GPL(ide_set_pio);
+
+/**
+ *      ide_rate_filter         -       filter transfer mode
+ *      @drive: IDE device
+ *      @speed: desired speed
+ *
+ *      Given the available transfer modes this function returns
+ *      the best available speed at or below the speed requested.
+ *
+ *      TODO: check device PIO capabilities
+ */
+
+static u8 ide_rate_filter(ide_drive_t *drive, u8 speed)
+{
+        ide_hwif_t *hwif = drive->hwif;
+        u8 mode = ide_find_dma_mode(drive, speed);
+
+        if (mode == 0) {
+                if (hwif->pio_mask)
+                        mode = fls(hwif->pio_mask) - 1 + XFER_PIO_0;
+                else
+                        mode = XFER_PIO_4;
+        }
+
+/*      printk("%s: mode 0x%02x, speed 0x%02x\n", __func__, mode, speed); */
+
+        return min(speed, mode);
+}
+
+/**
+ *      ide_set_xfer_rate       -       set transfer rate
+ *      @drive: drive to set
+ *      @rate: speed to attempt to set
+ *
+ *      General helper for setting the speed of an IDE device. This
+ *      function knows about user enforced limits from the configuration
+ *      which ->set_pio_mode/->set_dma_mode does not.
+ */
+
+int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
+{
+        ide_hwif_t *hwif = drive->hwif;
+        const struct ide_port_ops *port_ops = hwif->port_ops;
+
+        if (port_ops == NULL || port_ops->set_dma_mode == NULL ||
+            (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
+                return -1;
+
+        rate = ide_rate_filter(drive, rate);
+
+        BUG_ON(rate < XFER_PIO_0);
+
+        if (rate >= XFER_PIO_0 && rate <= XFER_PIO_5)
+                return ide_set_pio_mode(drive, rate);
+
+        return ide_set_dma_mode(drive, rate);
+}