add IXP4xx GPIOLIB support based on Chris' patch

[openwrt.git] / target / linux / ar7 / files / drivers / vlynq / vlynq.c

diff --git a/target/linux/ar7/files/drivers/vlynq/vlynq.c b/target/linux/ar7/files/drivers/vlynq/vlynq.c
index 1de5789..25f303b 100644 (file)
--- a/target/linux/ar7/files/drivers/vlynq/vlynq.c
+++ b/target/linux/ar7/files/drivers/vlynq/vlynq.c
@@ -26,6 +26,7 @@
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/device.h>
+#include <linux/delay.h>
 #include <linux/io.h>
 
 #include <linux/vlynq.h>
@@ -301,39 +302,19 @@ static int vlynq_device_match(struct device *dev,
 {
        struct vlynq_device *vdev = to_vlynq_device(dev);
        struct vlynq_driver *vdrv = to_vlynq_driver(drv);
-       struct plat_vlynq_ops *ops = dev->platform_data;
        struct vlynq_device_id *ids = vdrv->id_table;
-       u32 id = 0;
-       int result, flag;
 
        while (ids->id) {
-               flag = 0;
-               if (ids->divisor != vlynq_div_auto
-                               && vdev->divisor == vlynq_div_auto) {
-                       flag = 1;
+               if (ids->id == vdev->dev_id) {
                        vdev->divisor = ids->divisor;
-                       result = __vlynq_enable_device(vdev);
-                       if (result == 0) {
-                               id = vlynq_reg_read(vdev->remote->chip);
-                               vlynq_reg_write(vdev->local->control, 0);
-                               vlynq_reg_write(vdev->remote->control, 0);
-                               ops->off(vdev);
-                       } else
-                               id = vdev->dev_id;
-               } else
-                       id = vdev->dev_id;
-               if (ids->id == id) {
-                       vdev->dev_id = id;
                        vlynq_set_drvdata(vdev, ids);
                        printk(KERN_INFO "Driver found for VLYNQ " \
-                               "device: %08x\n", id);
+                               "device: %08x\n", vdev->dev_id);
                        return 1;
                }
-               printk(KERN_INFO "Not using the %08x VLYNQ device's " \
-                       "driver for VLYNQ device: %08x\n", ids->id, id);
+               printk(KERN_DEBUG "Not using the %08x VLYNQ device's driver" \
+                       " for VLYNQ device: %08x\n", ids->id, vdev->dev_id);
                ids++;
-               if (flag)
-                       vdev->divisor = vlynq_div_auto;
        }
        return 0;
 }
@@ -385,20 +366,22 @@ static int __vlynq_enable_device(struct vlynq_device *dev)
        if (result)
                return result;
 
-       vlynq_reg_write(dev->local->control, 0);
-       vlynq_reg_write(dev->remote->control, 0);
-       if (vlynq_linked(dev)) {
-               printk(KERN_DEBUG "%s: using external clock\n",
-                       dev->dev.bus_id);
-               return 0;
-       }
-
        switch (dev->divisor) {
+       case vlynq_div_external:
        case vlynq_div_auto:
-               /* Only try locally supplied clock, others cause problems */
                vlynq_reg_write(dev->local->control, 0);
                vlynq_reg_write(dev->remote->control, 0);
-               for (i = vlynq_ldiv2; i <= vlynq_ldiv8; i++) {
+               if (vlynq_linked(dev)) {
+                       dev->divisor = vlynq_div_external;
+                       printk(KERN_DEBUG "%s: using external clock\n",
+                               dev->dev.bus_id);
+                       return 0;
+               }
+
+               /* Only try locally supplied clock, others cause problems */
+               for (i = dev->dev_id ? vlynq_ldiv2 : vlynq_ldiv8; dev->dev_id ?
+                               i <= vlynq_ldiv8 : i >= vlynq_ldiv2;
+                               dev->dev_id ? i++ : i--) {
                        vlynq_reg_write(dev->local->control,
                                        VLYNQ_CTRL_CLOCK_INT |
                                        VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1));
@@ -618,15 +601,13 @@ static int vlynq_probe(struct platform_device *pdev)
               dev->dev.bus_id, (void *)dev->regs_start, dev->irq,
               (void *)dev->mem_start);
 
+       dev->dev_id = 0;
        dev->divisor = vlynq_div_auto;
        result = __vlynq_enable_device(dev);
        if (result == 0) {
                dev->dev_id = vlynq_reg_read(dev->remote->chip);
-               vlynq_reg_write(dev->local->control, 0);
-               vlynq_reg_write(dev->remote->control, 0);
                ((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
-       } else
-               dev->dev_id = 0;
+       }
        if (dev->dev_id)
                printk(KERN_INFO "Found a VLYNQ device: %08x\n", dev->dev_id);