path: root/target/linux/ar7/patches-2.6.30/131-vlynq_fixes.patch

--- a/drivers/vlynq/vlynq.c
+++ b/drivers/vlynq/vlynq.c
@@ -14,6 +14,9 @@
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Parts of the VLYNQ specification can be found here:
+ * http://www.ti.com/litv/pdf/sprue36a
  */
 
 #include <linux/init.h>
@@ -25,7 +28,6 @@
 #include <linux/errno.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
-#include <linux/device.h>
 #include <linux/delay.h>
 #include <linux/io.h>
 
@@ -73,15 +75,11 @@ struct vlynq_regs {
 	u32 int_device[8];
 };
 
-#define vlynq_reg_read(reg) readl(&(reg))
-#define vlynq_reg_write(reg, val)  writel(val, &(reg))
-
-static int __vlynq_enable_device(struct vlynq_device *dev);
-
-#ifdef VLYNQ_DEBUG
+#ifdef CONFIG_VLYNQ_DEBUG
 static void vlynq_dump_regs(struct vlynq_device *dev)
 {
 	int i;
+
 	printk(KERN_DEBUG "VLYNQ local=%p remote=%p\n",
 			dev->local, dev->remote);
 	for (i = 0; i < 32; i++) {
@@ -95,20 +93,23 @@ static void vlynq_dump_regs(struct vlynq
 static void vlynq_dump_mem(u32 *base, int count)
 {
 	int i;
+
 	for (i = 0; i < (count + 3) / 4; i++) {
-		if (i % 4 == 0) printk(KERN_DEBUG "\nMEM[0x%04x]:", i * 4);
+		if (i % 4 == 0)
+			printk(KERN_DEBUG "\nMEM[0x%04x]:", i * 4);
 		printk(KERN_DEBUG " 0x%08x", *(base + i));
 	}
 	printk(KERN_DEBUG "\n");
 }
 #endif
 
-int vlynq_linked(struct vlynq_device *dev)
+/* Check the VLYNQ link status with a given device */
+static int vlynq_linked(struct vlynq_device *dev)
 {
 	int i;
 
 	for (i = 0; i < 100; i++)
-		if (vlynq_reg_read(dev->local->status) & VLYNQ_STATUS_LINK)
+		if (readl(&dev->local->status) & VLYNQ_STATUS_LINK)
 			return 1;
 		else
 			cpu_relax();
@@ -118,17 +119,15 @@ int vlynq_linked(struct vlynq_device *de
 
 static void vlynq_reset(struct vlynq_device *dev)
 {
-	vlynq_reg_write(dev->local->control,
-			vlynq_reg_read(dev->local->control) |
-			VLYNQ_CTRL_RESET);
+	writel(readl(&dev->local->control) | VLYNQ_CTRL_RESET,
+			&dev->local->control);
 
 	/* 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);
+	writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET,
+			&dev->local->control);
 
 	/* Give some time for the devices to settle */
 	msleep(5);
@@ -142,9 +141,9 @@ static void vlynq_irq_unmask(unsigned in
 
 	BUG_ON(!dev);
 	virq = irq - dev->irq_start;
-	val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
+	val = readl(&dev->remote->int_device[virq >> 2]);
 	val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq);
-	vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
+	writel(val, &dev->remote->int_device[virq >> 2]);
 }
 
 static void vlynq_irq_mask(unsigned int irq)
@@ -155,9 +154,9 @@ static void vlynq_irq_mask(unsigned int 
 
 	BUG_ON(!dev);
 	virq = irq - dev->irq_start;
-	val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
+	val = readl(&dev->remote->int_device[virq >> 2]);
 	val &= ~(VINT_ENABLE << VINT_OFFSET(virq));
-	vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
+	writel(val, &dev->remote->int_device[virq >> 2]);
 }
 
 static int vlynq_irq_type(unsigned int irq, unsigned int flow_type)
@@ -168,7 +167,7 @@ static int vlynq_irq_type(unsigned int i
 
 	BUG_ON(!dev);
 	virq = irq - dev->irq_start;
-	val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
+	val = readl(&dev->remote->int_device[virq >> 2]);
 	switch (flow_type & IRQ_TYPE_SENSE_MASK) {
 	case IRQ_TYPE_EDGE_RISING:
 	case IRQ_TYPE_EDGE_FALLING:
@@ -187,28 +186,30 @@ static int vlynq_irq_type(unsigned int i
 	default:
 		return -EINVAL;
 	}
-	vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
+	writel(val, &dev->remote->int_device[virq >> 2]);
 	return 0;
 }
 
 static void vlynq_local_ack(unsigned int irq)
 {
 	struct vlynq_device *dev = get_irq_chip_data(irq);
-	u32 status = vlynq_reg_read(dev->local->status);
-	if (printk_ratelimit())
-		printk(KERN_DEBUG "%s: local status: 0x%08x\n",
-		       dev->dev.bus_id, status);
-	vlynq_reg_write(dev->local->status, status);
+
+	u32 status = readl(&dev->local->status);
+
+	pr_debug("%s: local status: 0x%08x\n",
+		       dev_name(&dev->dev), status);
+	writel(status, &dev->local->status);
 }
 
 static void vlynq_remote_ack(unsigned int irq)
 {
 	struct vlynq_device *dev = get_irq_chip_data(irq);
-	u32 status = vlynq_reg_read(dev->remote->status);
-	if (printk_ratelimit())
-		printk(KERN_DEBUG "%s: remote status: 0x%08x\n",
-		       dev->dev.bus_id, status);
-	vlynq_reg_write(dev->remote->status, status);
+
+	u32 status = readl(&dev->remote->status);
+
+	pr_debug("%s: remote status: 0x%08x\n",
+		       dev_name(&dev->dev), status);
+	writel(status, &dev->remote->status);
 }
 
 static irqreturn_t vlynq_irq(int irq, void *dev_id)
@@ -217,8 +218,8 @@ static irqreturn_t vlynq_irq(int irq, vo
 	u32 status;
 	int virq = 0;
 
-	status = vlynq_reg_read(dev->local->int_status);
-	vlynq_reg_write(dev->local->int_status, status);
+	status = readl(&dev->local->int_status);
+	writel(status, &dev->local->int_status);
 
 	if (unlikely(!status))
 		spurious_interrupt();
@@ -262,28 +263,28 @@ static int vlynq_setup_irq(struct vlynq_
 	if (dev->local_irq == dev->remote_irq) {
 		printk(KERN_ERR
 		       "%s: local vlynq irq should be different from remote\n",
-		       dev->dev.bus_id);
+		       dev_name(&dev->dev));
 		return -EINVAL;
 	}
 
 	/* Clear local and remote error bits */
-	vlynq_reg_write(dev->local->status, vlynq_reg_read(dev->local->status));
-	vlynq_reg_write(dev->remote->status,
-			vlynq_reg_read(dev->remote->status));
+	writel(readl(&dev->local->status), &dev->local->status);
+	writel(readl(&dev->remote->status), &dev->remote->status);
 
 	/* Now setup interrupts */
 	val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq);
 	val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL |
 		VLYNQ_CTRL_INT2CFG;
-	val |= vlynq_reg_read(dev->local->control);
-	vlynq_reg_write(dev->local->int_ptr, VLYNQ_INT_OFFSET);
-	vlynq_reg_write(dev->local->control, val);
+	val |= readl(&dev->local->control);
+	writel(VLYNQ_INT_OFFSET, &dev->local->int_ptr);
+	writel(val, &dev->local->control);
 
 	val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq);
 	val |= VLYNQ_CTRL_INT_ENABLE;
-	val |= vlynq_reg_read(dev->remote->control);
-	vlynq_reg_write(dev->remote->int_ptr, VLYNQ_INT_OFFSET);
-	vlynq_reg_write(dev->remote->control, val);
+	val |= readl(&dev->remote->control);
+	writel(VLYNQ_INT_OFFSET, &dev->remote->int_ptr);
+	writel(val, &dev->remote->int_ptr);
+	writel(val, &dev->remote->control);
 
 	for (i = dev->irq_start; i <= dev->irq_end; i++) {
 		virq = i - dev->irq_start;
@@ -299,12 +300,13 @@ static int vlynq_setup_irq(struct vlynq_
 			set_irq_chip_and_handler(i, &vlynq_irq_chip,
 						 handle_simple_irq);
 			set_irq_chip_data(i, dev);
-			vlynq_reg_write(dev->remote->int_device[virq >> 2], 0);
+			writel(0, &dev->remote->int_device[virq >> 2]);
 		}
 	}
 
 	if (request_irq(dev->irq, vlynq_irq, IRQF_SHARED, "vlynq", dev)) {
-		printk(KERN_ERR "%s: request_irq failed\n", dev->dev.bus_id);
+		printk(KERN_ERR "%s: request_irq failed\n",
+					dev_name(&dev->dev));
 		return -EAGAIN;
 	}
 
@@ -328,11 +330,11 @@ static int vlynq_device_match(struct dev
 		if (ids->id == vdev->dev_id) {
 			vdev->divisor = ids->divisor;
 			vlynq_set_drvdata(vdev, ids);
-			printk(KERN_INFO "Driver found for VLYNQ " \
+			printk(KERN_INFO "Driver found for VLYNQ "
 				"device: %08x\n", vdev->dev_id);
 			return 1;
 		}
-		printk(KERN_DEBUG "Not using the %08x VLYNQ device's driver" \
+		printk(KERN_DEBUG "Not using the %08x VLYNQ device's driver"
 			" for VLYNQ device: %08x\n", ids->id, vdev->dev_id);
 		ids++;
 	}
@@ -346,8 +348,7 @@ static int vlynq_device_probe(struct dev
 	struct vlynq_device_id *id = vlynq_get_drvdata(vdev);
 	int result = -ENODEV;
 
-	get_device(dev);
-	if (drv && drv->probe)
+	if (drv->probe)
 		result = drv->probe(vdev, id);
 	if (result)
 		put_device(dev);
@@ -357,9 +358,10 @@ static int vlynq_device_probe(struct dev
 static int vlynq_device_remove(struct device *dev)
 {
 	struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
-	if (drv && drv->remove)
+
+	if (drv->remove)
 		drv->remove(to_vlynq_device(dev));
-	put_device(dev);
+
 	return 0;
 }
 
@@ -377,6 +379,14 @@ void vlynq_unregister_driver(struct vlyn
 }
 EXPORT_SYMBOL(vlynq_unregister_driver);
 
+/*
+ * A VLYNQ remote device can clock the VLYNQ bus master
+ * using a dedicated clock line. In that case, both the
+ * remove device and the bus master should have the same
+ * serial clock dividers configured. Iterate through the
+ * 8 possible dividers until we actually link with the
+ * device.
+ */
 static int __vlynq_try_remote(struct vlynq_device *dev)
 {
 	int i;
@@ -389,21 +399,21 @@ static int __vlynq_try_remote(struct vly
 		if (!vlynq_linked(dev))
 			break;
 
-		vlynq_reg_write(dev->remote->control,
-				(vlynq_reg_read(dev->remote->control) &
+		writel((readl(&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_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)));
+				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->dev.bus_id, i - vlynq_rdiv1 + 1);
+				dev_name(&dev->dev), i - vlynq_rdiv1 + 1);
 			dev->divisor = i;
 			return 0;
 		} else {
@@ -414,26 +424,33 @@ static int __vlynq_try_remote(struct vly
 	return -ENODEV;
 }
 
+/*
+ * A VLYNQ remote device can be clocked by the VLYNQ bus
+ * master using a dedicated clock line. In that case, only
+ * the bus master configures the serial clock divider.
+ * Iterate through the 8 possible dividers until we
+ * actually get a link with the device.
+ */
 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) &
+		writel((readl(&dev->local->control) &
 				~VLYNQ_CTRL_CLOCK_MASK) |
 				VLYNQ_CTRL_CLOCK_INT |
-				VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1));
+				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->dev.bus_id, i - vlynq_ldiv1 + 1);
+				dev_name(&dev->dev), i - vlynq_ldiv1 + 1);
 			dev->divisor = i;
 			return 0;
 		} else {
@@ -444,27 +461,33 @@ static int __vlynq_try_local(struct vlyn
 	return -ENODEV;
 }
 
+/*
+ * When using external clocking method, serial clock
+ * is supplied by an external oscillator, therefore we
+ * should mask the local clock bit in the clock control
+ * register for both the bus master and the remote device.
+ */
 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));
+	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->dev.bus_id);
+			dev_name(&dev->dev));
 			dev->divisor = vlynq_div_external;
 		return 0;
 	}
-	
+
 	return -ENODEV;
 }
 
@@ -481,10 +504,10 @@ static int __vlynq_enable_device(struct 
 	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) && vlynq_reg_read(dev->remote->control) &
+		 * 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)  ||
@@ -497,31 +520,43 @@ static int __vlynq_enable_device(struct 
 				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,
-				VLYNQ_CTRL_CLOCK_INT |
-				VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
-						     vlynq_ldiv1));
-		vlynq_reg_write(dev->remote->control, 0);
+	case vlynq_ldiv1:
+	case vlynq_ldiv2:
+	case vlynq_ldiv3:
+	case vlynq_ldiv4:
+	case vlynq_ldiv5:
+	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->dev.bus_id, dev->divisor - vlynq_ldiv1 + 1);
+				"%s: using local clock divisor %d\n",
+				dev_name(&dev->dev),
+				dev->divisor - vlynq_ldiv1 + 1);
 			return 0;
 		}
 		break;
-	case vlynq_rdiv1: case vlynq_rdiv2: case vlynq_rdiv3: case vlynq_rdiv4:
-	case vlynq_rdiv5: case vlynq_rdiv6: case vlynq_rdiv7: case vlynq_rdiv8:
-		vlynq_reg_write(dev->local->control, 0);
-		vlynq_reg_write(dev->remote->control,
-				VLYNQ_CTRL_CLOCK_INT |
-				VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
-						     vlynq_rdiv1));
+	case vlynq_rdiv1:
+	case vlynq_rdiv2:
+	case vlynq_rdiv3:
+	case vlynq_rdiv4:
+	case vlynq_rdiv5:
+	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->dev.bus_id, dev->divisor - vlynq_rdiv1 + 1);
+				"%s: using remote clock divisor %d\n",
+				dev_name(&dev->dev),
+				dev->divisor - vlynq_rdiv1 + 1);
 			return 0;
 		}
 		break;
@@ -568,12 +603,10 @@ int vlynq_set_local_mapping(struct vlynq
 	if (!dev->enabled)
 		return -ENXIO;
 
-	vlynq_reg_write(dev->local->tx_offset, tx_offset);
+	writel(tx_offset, &dev->local->tx_offset);
 	for (i = 0; i < 4; i++) {
-		vlynq_reg_write(dev->local->rx_mapping[i].offset,
-							mapping[i].offset);
-		vlynq_reg_write(dev->local->rx_mapping[i].size,
-							mapping[i].size);
+		writel(mapping[i].offset, &dev->local->rx_mapping[i].offset);
+		writel(mapping[i].size, &dev->local->rx_mapping[i].size);
 	}
 	return 0;
 }
@@ -587,12 +620,10 @@ int vlynq_set_remote_mapping(struct vlyn
 	if (!dev->enabled)
 		return -ENXIO;
 
-	vlynq_reg_write(dev->remote->tx_offset, tx_offset);
+	writel(tx_offset, &dev->remote->tx_offset);
 	for (i = 0; i < 4; i++) {
-		vlynq_reg_write(dev->remote->rx_mapping[i].offset,
-							mapping[i].offset);
-		vlynq_reg_write(dev->remote->rx_mapping[i].size,
-							mapping[i].size);
+		writel(mapping[i].offset, &dev->remote->rx_mapping[i].offset);
+		writel(mapping[i].size, &dev->remote->rx_mapping[i].size);
 	}
 	return 0;
 }
@@ -662,8 +693,7 @@ static int vlynq_probe(struct platform_d
 	dev->id = pdev->id;
 	dev->dev.bus = &vlynq_bus_type;
 	dev->dev.parent = &pdev->dev;
-	snprintf(dev->dev.bus_id, BUS_ID_SIZE, "vlynq%d", dev->id);
-	dev->dev.bus_id[BUS_ID_SIZE - 1] = 0;
+	dev_set_name(&dev->dev, "vlynq%d", dev->id);
 	dev->dev.platform_data = pdev->dev.platform_data;
 	dev->dev.release = vlynq_device_release;
 
@@ -673,9 +703,9 @@ static int vlynq_probe(struct platform_d
 	dev->mem_end = mem_res->end;
 
 	len = regs_res->end - regs_res->start;
-	if (!request_mem_region(regs_res->start, len, dev->dev.bus_id)) {
+	if (!request_mem_region(regs_res->start, len, dev_name(&dev->dev))) {
 		printk(KERN_ERR "%s: Can't request vlynq registers\n",
-		       dev->dev.bus_id);
+		       dev_name(&dev->dev));
 		result = -ENXIO;
 		goto fail_request;
 	}
@@ -683,7 +713,7 @@ static int vlynq_probe(struct platform_d
 	dev->local = ioremap(regs_res->start, len);
 	if (!dev->local) {
 		printk(KERN_ERR "%s: Can't remap vlynq registers\n",
-		       dev->dev.bus_id);
+		       dev_name(&dev->dev));
 		result = -ENXIO;
 		goto fail_remap;
 	}
@@ -702,14 +732,14 @@ 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->dev.bus_id, (void *)dev->regs_start, dev->irq,
+	       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) {
-		dev->dev_id = vlynq_reg_read(dev->remote->chip);
+		dev->dev_id = readl(&dev->remote->chip);
 		((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
 	}
 	if (dev->dev_id)