path: root/target/linux/ar7/patches-4.9/160-vlynq_try_remote_first.patch

--- a/drivers/vlynq/vlynq.c
+++ b/drivers/vlynq/vlynq.c
@@ -119,20 +119,40 @@ static int vlynq_linked(struct vlynq_dev
 	return 0;
 }
 
+static volatile int vlynq_delay_value_new = 0;
+
+static void vlynq_delay_wait(u32 count)
+{
+	/* Code adopted from original vlynq driver */
+	int i = 0;
+	volatile int *ptr = &vlynq_delay_value_new;
+	*ptr = 0;
+
+	/* We are assuming that the each cycle takes about
+	 * 23 assembly instructions. */
+	for(i = 0; i < (count + 23)/23; i++)
+		*ptr = *ptr + 1;
+}
+
 static void vlynq_reset(struct vlynq_device *dev)
 {
+	u32 rtm = readl(&dev->local->revision);
+
+	rtm = rtm < 0x00010205 || readl(&dev->local->status) & 0x800 == 0 ?
+			0 : 0x600000;
+
 	writel(readl(&dev->local->control) | VLYNQ_CTRL_RESET,
 			&dev->local->control);
 
 	/* Wait for the devices to finish resetting */
-	msleep(5);
+	vlynq_delay_wait(0xffffff);
 
 	/* Remove reset bit */
-	writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET,
+	writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET | rtm,
 			&dev->local->control);
 
 	/* Give some time for the devices to settle */
-	msleep(5);
+	vlynq_delay_wait(0xffffff);
 }
 
 static void vlynq_irq_unmask(struct irq_data *d)
@@ -379,6 +399,61 @@ void vlynq_unregister_driver(struct vlyn
 }
 EXPORT_SYMBOL(vlynq_unregister_driver);
 
+enum vlynq_clk_src {
+	vlynq_clk_external,
+	vlynq_clk_local,
+	vlynq_clk_remote,
+	vlynq_clk_invalid,
+};
+
+static int __vlynq_set_clocks(struct vlynq_device *dev,
+				enum vlynq_clk_src clk_dir,
+				int lclk_div, int rclk_div)
+{
+	u32 reg;
+
+	if (clk_dir == vlynq_clk_invalid) {
+		printk(KERN_ERR "%s: attempt to set invalid clocking\n",
+				dev_name(&dev->dev));
+		return -EINVAL;
+	}
+
+	reg = readl(&dev->local->control);
+	if (readl(&dev->local->revision) < 0x00010205) {
+		if (clk_dir & vlynq_clk_local)
+			reg |= VLYNQ_CTRL_CLOCK_INT;
+		else
+			reg &= ~VLYNQ_CTRL_CLOCK_INT;
+	}
+	reg &= ~VLYNQ_CTRL_CLOCK_MASK;
+	reg |= VLYNQ_CTRL_CLOCK_DIV(lclk_div);
+	writel(reg, &dev->local->control);
+
+	if (!vlynq_linked(dev))
+		return -ENODEV;
+
+	printk(KERN_INFO "%s: local VLYNQ protocol rev. is 0x%08x\n",
+			dev_name(&dev->dev), readl(&dev->local->revision));
+	printk(KERN_INFO "%s: remote VLYNQ protocol rev. is 0x%08x\n",
+			dev_name(&dev->dev), readl(&dev->remote->revision));
+
+	reg = readl(&dev->remote->control);
+	if (readl(&dev->remote->revision) < 0x00010205) {
+		if (clk_dir & vlynq_clk_remote)
+			reg |= VLYNQ_CTRL_CLOCK_INT;
+		else
+			reg &= ~VLYNQ_CTRL_CLOCK_INT;
+	}
+	reg &= ~VLYNQ_CTRL_CLOCK_MASK;
+	reg |= VLYNQ_CTRL_CLOCK_DIV(rclk_div);
+	writel(reg, &dev->remote->control);
+
+	if (!vlynq_linked(dev))
+		return -ENODEV;
+
+	return 0;
+}
+
 /*
  * A VLYNQ remote device can clock the VLYNQ bus master
  * using a dedicated clock line. In that case, both the
@@ -392,29 +467,16 @@ static int __vlynq_try_remote(struct vly
 	int i;
 
 	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--) {
+	for (i = 0; i <= 7; i++) {
 
 		if (!vlynq_linked(dev))
 			break;
 
-		writel((readl(&dev->remote->control) &
-				~VLYNQ_CTRL_CLOCK_MASK) |
-				VLYNQ_CTRL_CLOCK_INT |
-				VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
-				&dev->remote->control);
-		writel((readl(&dev->local->control)
-				& ~(VLYNQ_CTRL_CLOCK_INT |
-				VLYNQ_CTRL_CLOCK_MASK)) |
-				VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
-				&dev->local->control);
-
-		if (vlynq_linked(dev)) {
-			printk(KERN_DEBUG
-				"%s: using remote clock divisor %d\n",
-				dev_name(&dev->dev), i - vlynq_rdiv1 + 1);
-			dev->divisor = i;
+		if (!__vlynq_set_clocks(dev, vlynq_clk_remote, i, i)) {
+			printk(KERN_INFO
+					"%s: using remote clock divisor %d\n",
+					dev_name(&dev->dev), i + 1);
+			dev->divisor = i + vlynq_rdiv1;
 			return 0;
 		} else {
 			vlynq_reset(dev);
@@ -433,25 +495,17 @@ static int __vlynq_try_remote(struct vly
  */
 static int __vlynq_try_local(struct vlynq_device *dev)
 {
-	int i;
+	int i, dir = !dev->dev_id;
 
 	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--) {
-
-		writel((readl(&dev->local->control) &
-				~VLYNQ_CTRL_CLOCK_MASK) |
-				VLYNQ_CTRL_CLOCK_INT |
-				VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1),
-				&dev->local->control);
-
-		if (vlynq_linked(dev)) {
-			printk(KERN_DEBUG
-				"%s: using local clock divisor %d\n",
-				dev_name(&dev->dev), i - vlynq_ldiv1 + 1);
-			dev->divisor = i;
+	for (i = dir ? 7 : 0; dir ? i >= 0 : i <= 7; dir ? i-- : i++) {
+
+		if (!__vlynq_set_clocks(dev, vlynq_clk_local, i, 0)) {
+			printk(KERN_INFO
+					"%s: using local clock divisor %d\n",
+					dev_name(&dev->dev), i + 1);
+			dev->divisor = i + vlynq_ldiv1;
 			return 0;
 		} else {
 			vlynq_reset(dev);
@@ -473,18 +527,10 @@ static int __vlynq_try_external(struct v
 	if (!vlynq_linked(dev))
 		return -ENODEV;
 
-	writel((readl(&dev->remote->control) &
-			~VLYNQ_CTRL_CLOCK_INT),
-			&dev->remote->control);
-
-	writel((readl(&dev->local->control) &
-			~VLYNQ_CTRL_CLOCK_INT),
-			&dev->local->control);
-
-	if (vlynq_linked(dev)) {
-		printk(KERN_DEBUG "%s: using external clock\n",
-			dev_name(&dev->dev));
-			dev->divisor = vlynq_div_external;
+	if (!__vlynq_set_clocks(dev, vlynq_clk_external, 0, 0)) {
+		printk(KERN_INFO "%s: using external clock\n",
+				dev_name(&dev->dev));
+				dev->divisor = vlynq_div_external;
 		return 0;
 	}
 
@@ -501,24 +547,16 @@ static int __vlynq_enable_device(struct
 		return result;
 
 	switch (dev->divisor) {
-	case vlynq_div_external:
 	case vlynq_div_auto:
 		/* 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) && readl(&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;
-		}
+		if (!__vlynq_try_remote(dev) || !__vlynq_try_local(dev))
+			return 0;
+	case vlynq_div_external:
+		if (!__vlynq_try_external(dev))
+			return 0;
 		break;
 	case vlynq_ldiv1:
 	case vlynq_ldiv2:
@@ -528,15 +566,12 @@ static int __vlynq_enable_device(struct
 	case vlynq_ldiv6:
 	case vlynq_ldiv7:
 	case vlynq_ldiv8:
-		writel(VLYNQ_CTRL_CLOCK_INT |
-			VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
-			vlynq_ldiv1), &dev->local->control);
-		writel(0, &dev->remote->control);
-		if (vlynq_linked(dev)) {
-			printk(KERN_DEBUG
-				"%s: using local clock divisor %d\n",
-				dev_name(&dev->dev),
-				dev->divisor - vlynq_ldiv1 + 1);
+		if (!__vlynq_set_clocks(dev, vlynq_clk_local, dev->divisor -
+				vlynq_ldiv1, 0)) {
+			printk(KERN_INFO
+					"%s: using local clock divisor %d\n",
+					dev_name(&dev->dev),
+					dev->divisor - vlynq_ldiv1 + 1);
 			return 0;
 		}
 		break;
@@ -548,20 +583,17 @@ static int __vlynq_enable_device(struct
 	case vlynq_rdiv6:
 	case vlynq_rdiv7:
 	case vlynq_rdiv8:
-		writel(0, &dev->local->control);
-		writel(VLYNQ_CTRL_CLOCK_INT |
-			VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
-			vlynq_rdiv1), &dev->remote->control);
-		if (vlynq_linked(dev)) {
-			printk(KERN_DEBUG
-				"%s: using remote clock divisor %d\n",
-				dev_name(&dev->dev),
-				dev->divisor - vlynq_rdiv1 + 1);
+		if (!__vlynq_set_clocks(dev, vlynq_clk_remote, 0,
+				dev->divisor - vlynq_rdiv1)) {
+			printk(KERN_INFO
+					"%s: using remote clock divisor %d\n",
+					dev_name(&dev->dev),
+					dev->divisor - vlynq_rdiv1 + 1);
 			return 0;
 		}
 		break;
 	}
-
+	vlynq_reset(dev);
 	ops->off(dev);
 	return -ENODEV;
 }
@@ -732,14 +764,14 @@ static int vlynq_probe(struct platform_d
 	platform_set_drvdata(pdev, dev);
 
 	printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n",
-	       dev_name(&dev->dev), (void *)dev->regs_start, dev->irq,
-	       (void *)dev->mem_start);
+			dev_name(&dev->dev), (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) {
+	if (!__vlynq_enable_device(dev)) {
 		dev->dev_id = readl(&dev->remote->chip);
+		vlynq_reset(dev);
 		((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
 	}
 	if (dev->dev_id)