Subject: [PATCH] powerpc: convert macio_asic to use prom_parse

From: Benjamin Herrenschmidt <[email-masked]>
Date: Wed, 23 Nov 2005 17:59:04 +1100

Converts the macio_asic core to use the new OF parsing routines instead
of relying on the pre-parsed values in struct device_node.

Signed-off-by: Benjamin Herrenschmidt <[email-masked]>

Index: linux-serialfix/drivers/macintosh/macio_asic.c
===================================================================
--- linux-serialfix.orig/drivers/macintosh/macio_asic.c	2005-11-23 16:54:11.000000000 +1100
+++ linux-serialfix/drivers/macintosh/macio_asic.c	2005-11-23 16:54:26.000000000 +1100
@@ -3,6 +3,13 @@
  * a MacIO ASIC. Interface to new driver model mostly
  * stolen from the PCI version.
  * 
+ *  Copyright (C) 2005 Ben. Herrenschmidt ([email-masked])
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version
+ *  2 of the License, or (at your option) any later version.
+ *
  * TODO:
  * 
  *  - Don't probe below media bay by default, but instead provide
@@ -218,12 +225,14 @@ postcore_initcall(macio_bus_driver_init)

 /**
- * macio_release_dev - free a macio device structure when all users of it are finished.
+ * macio_release_dev - free a macio device structure when all users of it are
+ * finished.
  * @dev: device that's been disconnected
  *
- * Will be called only by the device core when all users of this macio device are
- * done. This currently means never as we don't hot remove any macio device yet,
- * though that will happen with mediabay based devices in a later implementation.
+ * Will be called only by the device core when all users of this macio device
+ * are done. This currently means never as we don't hot remove any macio
+ * device yet, though that will happen with mediabay based devices in a later
+ * implementation.
  */
 static void macio_release_dev(struct device *dev)
 {
@@ -242,7 +251,8 @@ static void macio_release_dev(struct dev
  * If this routine returns non-null, then the resource is completely
  * skipped.
  */
-static int macio_resource_quirks(struct device_node *np, struct resource *res, int index)
+static int macio_resource_quirks(struct device_node *np, struct resource *res,
+				 int index)
 {
 	if (res->flags & IORESOURCE_MEM) {
 		/* Grand Central has too large resource 0 on some machines */
@@ -258,12 +268,15 @@ static int macio_resource_quirks(struct 
 			np->addrs[index].size = 0x100;
 			res->end = res->start + 0xff;
 		}
-		/* ESCC parent eats child resources. We could have added a level of hierarchy,
-		 * but I don't really feel the need for it */
+		/* ESCC parent eats child resources. We could have added a
+		 * level of hierarchy, but I don't really feel the need
+		 * for it
+		 */
 		if (!strcmp(np->name, "escc"))
 			return 1;
 		/* ESCC has bogus resources >= 3 */
-		if (index >= 3 && !(strcmp(np->name, "ch-a") && strcmp(np->name, "ch-b")))
+		if (index >= 3 && !(strcmp(np->name, "ch-a") &&
+				    strcmp(np->name, "ch-b")))
 			return 1;
 		/* Media bay has too many resources, keep only first one */
 		if (index > 0 && !strcmp(np->name, "media-bay"))
@@ -285,6 +298,71 @@ static int macio_resource_quirks(struct 
 }

+static void macio_setup_interrupts(struct macio_dev *dev)
+{
+	struct device_node *np = dev->ofdev.node;
+	int i,j;
+
+	/* For now, we use pre-parsed entries in the device-tree for
+	 * interrupt routing and addresses, but we should change that
+	 * to dynamically parsed entries and so get rid of most of the
+	 * clutter in struct device_node
+	 */
+	for (i = j = 0; i < np->n_intrs; i++) {
+		struct resource *res = &dev->interrupt[j];
+
+		if (j >= MACIO_DEV_COUNT_IRQS)
+			break;
+		res->start = np->intrs[i].line;
+		res->flags = IORESOURCE_IO;
+		if (np->intrs[j].sense)
+			res->flags |= IORESOURCE_IRQ_LOWLEVEL;
+		else
+			res->flags |= IORESOURCE_IRQ_HIGHEDGE;
+		res->name = dev->ofdev.dev.bus_id;
+		if (macio_resource_quirks(np, res, i))
+			memset(res, 0, sizeof(struct resource));
+		else
+			j++;
+	}
+	dev->n_interrupts = j;
+}
+
+static void macio_setup_resources(struct macio_dev *dev,
+				  struct resource *parent_res)
+{
+	struct device_node *np = dev->ofdev.node;
+	u32 *addr;
+	u64 size;
+	int index;
+
+	for (index = 0; (addr = of_get_address(np, index, &size)) != NULL;
+	     index++) {
+		struct resource *res = &dev->resource[index];
+		if (index >= MACIO_DEV_COUNT_RESOURCES)
+			break;
+		res->start = of_translate_address(np, addr);
+		res->end = res->start + (unsigned long)size - 1;
+		res->flags = IORESOURCE_MEM;
+		res->name = dev->ofdev.dev.bus_id;
+
+		if (macio_resource_quirks(np, res, index)) {
+			memset(res, 0, sizeof(struct resource));
+			continue;
+		}
+		/* Currently, we consider failure as harmless, this may
+		 * change in the future, once I've found all the device
+		 * tree bugs in older machines & worked around them
+		 */
+		if (insert_resource(parent_res, res)) {
+			printk(KERN_WARNING "Can't request resource "
+			       "%d for MacIO device %s\n",
+			       index, dev->ofdev.dev.bus_id);
+		}
+	}
+	dev->n_resources = index;
+}
+
 /**
  * macio_add_one_device - Add one device from OF node to the device tree
  * @chip: pointer to the macio_chip holding the device
@@ -294,12 +372,13 @@ static int macio_resource_quirks(struct 
  * When media-bay is changed to hotswap drivers, this function will
  * be exposed to the bay driver some way...
  */
-static struct macio_dev * macio_add_one_device(struct macio_chip *chip, struct device *parent,
-					       struct device_node *np, struct macio_dev *in_bay,
+static struct macio_dev * macio_add_one_device(struct macio_chip *chip,
+					       struct device *parent,
+					       struct device_node *np,
+					       struct macio_dev *in_bay,
 					       struct resource *parent_res)
 {
 	struct macio_dev *dev;
-	int i, j;
 	u32 *reg;
 	
 	if (np == NULL)
@@ -326,7 +405,8 @@ static struct macio_dev * macio_add_one_
 
 	/* MacIO itself has a different reg, we use it's PCI base */
 	if (np == chip->of_node) {
-		sprintf(dev->ofdev.dev.bus_id, "%1d.%08lx:%.*s", chip->lbus.index,
+		sprintf(dev->ofdev.dev.bus_id, "%1d.%08lx:%.*s",
+			chip->lbus.index,
 #ifdef CONFIG_PCI
 			pci_resource_start(chip->lbus.pdev, 0),
 #else
@@ -335,57 +415,16 @@ static struct macio_dev * macio_add_one_
 			MAX_NODE_NAME_SIZE, np->name);
 	} else {
 		reg = (u32 *)get_property(np, "reg", NULL);
-		sprintf(dev->ofdev.dev.bus_id, "%1d.%08x:%.*s", chip->lbus.index,
+		sprintf(dev->ofdev.dev.bus_id, "%1d.%08x:%.*s",
+			chip->lbus.index,
 			reg ? *reg : 0, MAX_NODE_NAME_SIZE, np->name);
 	}
 
-	/* For now, we use pre-parsed entries in the device-tree for
-	 * interrupt routing and addresses, but we should change that
-	 * to dynamically parsed entries and so get rid of most of the
-	 * clutter in struct device_node
-	 */
-	for (i = j = 0; i < np->n_intrs; i++) {
-		struct resource *res = &dev->interrupt[j];
-
-		if (j >= MACIO_DEV_COUNT_IRQS)
-			break;
-		res->start = np->intrs[i].line;
-		res->flags = IORESOURCE_IO;
-		if (np->intrs[j].sense)
-			res->flags |= IORESOURCE_IRQ_LOWLEVEL;
-		else
-			res->flags |= IORESOURCE_IRQ_HIGHEDGE;
-		res->name = dev->ofdev.dev.bus_id;
-		if (macio_resource_quirks(np, res, i))
-			memset(res, 0, sizeof(struct resource));
-		else
-			j++;
-	}
-	dev->n_interrupts = j;
-	for (i = j = 0; i < np->n_addrs; i++) {
-		struct resource *res = &dev->resource[j];
-		
-		if (j >= MACIO_DEV_COUNT_RESOURCES)
-			break;
-		res->start = np->addrs[i].address;
-		res->end = np->addrs[i].address + np->addrs[i].size - 1;
-		res->flags = IORESOURCE_MEM;
-		res->name = dev->ofdev.dev.bus_id;
-		if (macio_resource_quirks(np, res, i))
-			memset(res, 0, sizeof(struct resource));
-		else {
-			j++;
-			/* Currently, we consider failure as harmless, this may
-			 * change in the future, once I've found all the device
-			 * tree bugs in older machines & worked around them
-			 */
-			if (insert_resource(parent_res, res))
-       				printk(KERN_WARNING "Can't request resource %d for MacIO"
-				       " device %s\n", i, dev->ofdev.dev.bus_id);
-		}
-	}
-	dev->n_resources = j;
+	/* Setup interrupts & resources */
+	macio_setup_interrupts(dev);
+	macio_setup_resources(dev, parent_res);
 
+	/* Register with core */
 	if (of_device_register(&dev->ofdev) != 0) {
 		printk(KERN_DEBUG"macio: device registration error for %s!\n",
 		       dev->ofdev.dev.bus_id);
@@ -442,36 +481,42 @@ static void macio_pci_add_devices(struct
 
 	/* First scan 1st level */
 	for (np = NULL; (np = of_get_next_child(pnode, np)) != NULL;) {
-		if (!macio_skip_device(np)) {
-			of_node_get(np);
-			mdev = macio_add_one_device(chip, &rdev->ofdev.dev, np, NULL, root_res);
-			if (mdev == NULL)
-				of_node_put(np);
-			else if (strncmp(np->name, "media-bay", 9) == 0)
-				mbdev = mdev;
-			else if (strncmp(np->name, "escc", 4) == 0)
-				sdev = mdev;
-		}
+		if (macio_skip_device(np))
+			continue;
+		of_node_get(np);
+		mdev = macio_add_one_device(chip, &rdev->ofdev.dev, np, NULL,
+					    root_res);
+		if (mdev == NULL)
+			of_node_put(np);
+		else if (strncmp(np->name, "media-bay", 9) == 0)
+			mbdev = mdev;
+		else if (strncmp(np->name, "escc", 4) == 0)
+			sdev = mdev;
 	}
 
 	/* Add media bay devices if any */
 	if (mbdev)
-		for (np = NULL; (np = of_get_next_child(mbdev->ofdev.node, np)) != NULL;)
-			if (!macio_skip_device(np)) {
-				of_node_get(np);
-				if (macio_add_one_device(chip, &mbdev->ofdev.dev, np, mbdev,
-							 root_res) == NULL)
-					of_node_put(np);
-			}
+		for (np = NULL; (np = of_get_next_child(mbdev->ofdev.node, np))
+			     != NULL;) {
+			if (macio_skip_device(np))
+				continue;
+			of_node_get(np);
+			if (macio_add_one_device(chip, &mbdev->ofdev.dev, np,
+						 mbdev,  root_res) == NULL)
+				of_node_put(np);
+		}
+
 	/* Add serial ports if any */
 	if (sdev) {
-		for (np = NULL; (np = of_get_next_child(sdev->ofdev.node, np)) != NULL;)
-			if (!macio_skip_device(np)) {
-				of_node_get(np);
-				if (macio_add_one_device(chip, &sdev->ofdev.dev, np, NULL,
-							 root_res) == NULL)
-					of_node_put(np);
-			}
+		for (np = NULL; (np = of_get_next_child(sdev->ofdev.node, np))
+			     != NULL;) {
+			if (macio_skip_device(np))
+				continue;
+			of_node_get(np);
+			if (macio_add_one_device(chip, &sdev->ofdev.dev, np,
+						 NULL, root_res) == NULL)
+				of_node_put(np);
+		}
 	}
 }
 
@@ -519,7 +564,8 @@ void macio_unregister_driver(struct maci
  *	Returns 0 on success, or %EBUSY on error.  A warning
  *	message is also printed on failure.
  */
-int macio_request_resource(struct macio_dev *dev, int resource_no, const char *name)
+int macio_request_resource(struct macio_dev *dev, int resource_no,
+			   const char *name)
 {
 	if (macio_resource_len(dev, resource_no) == 0)
 		return 0;
@@ -606,20 +652,20 @@ static int __devinit macio_pci_probe(str
 	if (ent->vendor != PCI_VENDOR_ID_APPLE)
 		return -ENODEV;
 
-	/* Note regarding refcounting: We assume pci_device_to_OF_node() is ported
-	 * to new OF APIs and returns a node with refcount incremented. This isn't
-	 * the case today, but on the other hand ppc32 doesn't do refcounting. This
-	 * will have to be fixed when going to ppc64. --BenH.
+	/* Note regarding refcounting: We assume pci_device_to_OF_node() is
+	 * ported to new OF APIs and returns a node with refcount incremented.
 	 */
 	np = pci_device_to_OF_node(pdev);
 	if (np == NULL)
 		return -ENODEV;
 
-	/* This assumption is wrong, fix that here for now until I fix the arch */
+	/* The above assumption is wrong !!!
+	 * fix that here for now until I fix the arch code
+	 */
 	of_node_get(np);
 
-	/* We also assume that pmac_feature will have done a get() on nodes stored
-	 * in the macio chips array
+	/* We also assume that pmac_feature will have done a get() on nodes
+	 * stored in the macio chips array
 	 */
 	chip = macio_find(np, macio_unknown);
        	of_node_put(np);
@@ -639,9 +685,9 @@ static int __devinit macio_pci_probe(str
 
 	/*
 	 * HACK ALERT: The WallStreet PowerBook and some OHare based machines
-	 * have 2 macio ASICs. I must probe the "main" one first or IDE ordering
-	 * will be incorrect. So I put on "hold" the second one since it seem to
-	 * appear first on PCI
+	 * have 2 macio ASICs. I must probe the "main" one first or IDE
+	 * ordering will be incorrect. So I put on "hold" the second one since
+	 * it seem to appear first on PCI
 	 */
 	if (chip->type == macio_gatwick || chip->type == macio_ohareII)
 		if (macio_chips[0].lbus.pdev == NULL) {