X-Git-Url: https://git.rohieb.name/openwrt.git/blobdiff_plain/f46a1a6ee4fab418b689aad17cd6c2126688aea9..c57c9b688ba29ea6ef6cb05a25a245c002d53949:/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 1de5789b7..f4b7b0f98 100644
--- 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>
@@ -39,6 +40,8 @@
 #define VLYNQ_CTRL_INT2CFG		0x00000080
 #define VLYNQ_CTRL_RESET		0x00000001
 
+#define VLYNQ_CTRL_CLOCK_MASK          (0x7 << 16)
+
 #define VLYNQ_INT_OFFSET		0x00000014
 #define VLYNQ_REMOTE_OFFSET		0x00000080
 
@@ -113,6 +116,24 @@ int vlynq_linked(struct vlynq_device *dev)
 	return 0;
 }
 
+static void vlynq_reset(struct vlynq_device *dev)
+{
+	vlynq_reg_write(dev->local->control,
+			vlynq_reg_read(dev->local->control) |
+			VLYNQ_CTRL_RESET);
+
+	/* Wait for the devices to finish resetting */
+	msleep(5);
+
+	/* Remove reset bit */
+	vlynq_reg_write(dev->local->control,
+			vlynq_reg_read(dev->local->control) &
+			~VLYNQ_CTRL_RESET);
+
+	/* Give some time for the devices to settle */
+	msleep(5);
+}
+
 static void vlynq_irq_unmask(unsigned int irq)
 {
 	u32 val;
@@ -301,39 +322,19 @@ 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;
 }
@@ -376,40 +377,126 @@ void vlynq_unregister_driver(struct vlynq_driver *driver)
 }
 EXPORT_SYMBOL(vlynq_unregister_driver);
 
-static int __vlynq_enable_device(struct vlynq_device *dev)
+static int __vlynq_try_remote(struct vlynq_device *dev)
 {
-	int i, result;
-	struct plat_vlynq_ops *ops = dev->dev.platform_data;
+	int i;
 
-	result = ops->on(dev);
-	if (result)
-		return result;
+	vlynq_reset(dev);
+	for (i = dev->dev_id ? vlynq_rdiv2 : vlynq_rdiv8; dev->dev_id ?
+			i <= vlynq_rdiv8 : i >= vlynq_rdiv2;
+		dev->dev_id ? i++ : i--) {
+
+		if (!vlynq_linked(dev))
+			break;
+
+		vlynq_reg_write(dev->remote->control,
+				(vlynq_reg_read(dev->remote->control) &
+				~VLYNQ_CTRL_CLOCK_MASK) |
+				VLYNQ_CTRL_CLOCK_INT |
+				VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1));
+		vlynq_reg_write(dev->local->control,
+				((vlynq_reg_read(dev->local->control)
+				& ~(VLYNQ_CTRL_CLOCK_INT |
+				VLYNQ_CTRL_CLOCK_MASK)) |
+				VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1)));
+
+		if (vlynq_linked(dev)) {
+			printk(KERN_DEBUG
+				"%s: using remote clock divisor %d\n",
+				dev->dev.bus_id, i - vlynq_rdiv1 + 1);
+			dev->divisor = i;
+			return 0;
+		} else {
+			vlynq_reset(dev);
+		}
+	}
+
+	return -ENODEV;
+}
+
+static int __vlynq_try_local(struct vlynq_device *dev)
+{
+	int i;
+	
+	vlynq_reset(dev);
+
+	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_reg_read(dev->local->control) &
+				~VLYNQ_CTRL_CLOCK_MASK) |
+				VLYNQ_CTRL_CLOCK_INT |
+				VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1));
+
+		if (vlynq_linked(dev)) {
+			printk(KERN_DEBUG
+				"%s: using local clock divisor %d\n",
+				dev->dev.bus_id, i - vlynq_ldiv1 + 1);
+			dev->divisor = i;
+			return 0;
+		} else {
+			vlynq_reset(dev);
+		}
+	}
+
+	return -ENODEV;
+}
+
+static int __vlynq_try_external(struct vlynq_device *dev)
+{
+	vlynq_reset(dev);
+	if (!vlynq_linked(dev))
+		return -ENODEV;
+
+	vlynq_reg_write(dev->remote->control,
+			(vlynq_reg_read(dev->remote->control) &
+			~VLYNQ_CTRL_CLOCK_INT));
+
+	vlynq_reg_write(dev->local->control,
+			(vlynq_reg_read(dev->local->control) &
+			~VLYNQ_CTRL_CLOCK_INT));
 
-	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);
+			dev->divisor = vlynq_div_external;
 		return 0;
 	}
+	
+	return -ENODEV;
+}
+
+static int __vlynq_enable_device(struct vlynq_device *dev)
+{
+	int result;
+	struct plat_vlynq_ops *ops = dev->dev.platform_data;
+
+	result = ops->on(dev);
+	if (result)
+		return result;
 
 	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++) {
-			vlynq_reg_write(dev->local->control,
-					VLYNQ_CTRL_CLOCK_INT |
-					VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1));
-			if (vlynq_linked(dev)) {
-				printk(KERN_DEBUG
-				       "%s: using local clock divisor %d\n",
-				       dev->dev.bus_id, i - vlynq_ldiv1 + 1);
-				dev->divisor = i;
+		/* When the device is brought from reset it should have clock
+		generation negotiated by hardware.
+		Check which device is generating clocks and perform setup
+		accordingly */
+		if (vlynq_linked(dev) && vlynq_reg_read(dev->remote->control) &
+		   VLYNQ_CTRL_CLOCK_INT) {
+			if (!__vlynq_try_remote(dev) ||
+				!__vlynq_try_local(dev)  ||
+				!__vlynq_try_external(dev))
+				return 0;
+		} else {
+			if (!__vlynq_try_external(dev) ||
+				!__vlynq_try_local(dev)    ||
+				!__vlynq_try_remote(dev))
 				return 0;
-			}
 		}
+		break;
 	case vlynq_ldiv1: case vlynq_ldiv2: case vlynq_ldiv3: case vlynq_ldiv4:
 	case vlynq_ldiv5: case vlynq_ldiv6: case vlynq_ldiv7: case vlynq_ldiv8:
 		vlynq_reg_write(dev->local->control,
@@ -618,15 +705,13 @@ 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);