1 files changed, 376 insertions, 8 deletions

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 7dacc1ebe91e..bb72223c22ae 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -14,8 +14,105 @@
 #include <linux/errno.h>
 #include <linux/module.h>
 #include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/of_address.h>
 #include <linux/of_device.h>
+#include <linux/of_irq.h>
 #include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+static int of_dev_node_match(struct device *dev, void *data)
+{
+        return dev->of_node == data;
+}
+
+/**
+ * of_find_device_by_node - Find the platform_device associated with a node
+ * @np: Pointer to device tree node
+ *
+ * Returns platform_device pointer, or NULL if not found
+ */
+struct platform_device *of_find_device_by_node(struct device_node *np)
+{
+        struct device *dev;
+
+        dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match);
+        return dev ? to_platform_device(dev) : NULL;
+}
+EXPORT_SYMBOL(of_find_device_by_node);
+
+static int platform_driver_probe_shim(struct platform_device *pdev)
+{
+        struct platform_driver *pdrv;
+        struct of_platform_driver *ofpdrv;
+        const struct of_device_id *match;
+
+        pdrv = container_of(pdev->dev.driver, struct platform_driver, driver);
+        ofpdrv = container_of(pdrv, struct of_platform_driver, platform_driver);
+
+        /* There is an unlikely chance that an of_platform driver might match
+         * on a non-OF platform device.  If so, then of_match_device() will
+         * come up empty.  Return -EINVAL in this case so other drivers get
+         * the chance to bind. */
+        match = of_match_device(pdev->dev.driver->of_match_table, &pdev->dev);
+        return match ? ofpdrv->probe(pdev, match) : -EINVAL;
+}
+
+static void platform_driver_shutdown_shim(struct platform_device *pdev)
+{
+        struct platform_driver *pdrv;
+        struct of_platform_driver *ofpdrv;
+
+        pdrv = container_of(pdev->dev.driver, struct platform_driver, driver);
+        ofpdrv = container_of(pdrv, struct of_platform_driver, platform_driver);
+        ofpdrv->shutdown(pdev);
+}
+
+/**
+ * of_register_platform_driver
+ */
+int of_register_platform_driver(struct of_platform_driver *drv)
+{
+        char *of_name;
+
+        /* setup of_platform_driver to platform_driver adaptors */
+        drv->platform_driver.driver = drv->driver;
+
+        /* Prefix the driver name with 'of:' to avoid namespace collisions
+         * and bogus matches.  There are some drivers in the tree that
+         * register both an of_platform_driver and a platform_driver with
+         * the same name.  This is a temporary measure until they are all
+         * cleaned up --gcl July 29, 2010 */
+        of_name = kmalloc(strlen(drv->driver.name) + 5, GFP_KERNEL);
+        if (!of_name)
+                return -ENOMEM;
+        sprintf(of_name, "of:%s", drv->driver.name);
+        drv->platform_driver.driver.name = of_name;
+
+        if (drv->probe)
+                drv->platform_driver.probe = platform_driver_probe_shim;
+        drv->platform_driver.remove = drv->remove;
+        if (drv->shutdown)
+                drv->platform_driver.shutdown = platform_driver_shutdown_shim;
+        drv->platform_driver.suspend = drv->suspend;
+        drv->platform_driver.resume = drv->resume;
+
+        return platform_driver_register(&drv->platform_driver);
+}
+EXPORT_SYMBOL(of_register_platform_driver);
+
+void of_unregister_platform_driver(struct of_platform_driver *drv)
+{
+        platform_driver_unregister(&drv->platform_driver);
+        kfree(drv->platform_driver.driver.name);
+        drv->platform_driver.driver.name = NULL;
+}
+EXPORT_SYMBOL(of_unregister_platform_driver);
+
+#if defined(CONFIG_PPC_DCR)
+#include <asm/dcr.h>
+#endif
 
 extern struct device_attribute of_platform_device_attrs[];
 
@@ -33,11 +130,11 @@ static int of_platform_device_probe(struct device *dev)
 {
         int error = -ENODEV;
         struct of_platform_driver *drv;
-        struct of_device *of_dev;
+        struct platform_device *of_dev;
         const struct of_device_id *match;
 
         drv = to_of_platform_driver(dev->driver);
-        of_dev = to_of_device(dev);
+        of_dev = to_platform_device(dev);
 
         if (!drv->probe)
                 return error;
@@ -55,7 +152,7 @@ static int of_platform_device_probe(struct device *dev)
 
 static int of_platform_device_remove(struct device *dev)
 {
-        struct of_device *of_dev = to_of_device(dev);
+        struct platform_device *of_dev = to_platform_device(dev);
         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
 
         if (dev->driver && drv->remove)
@@ -65,7 +162,7 @@ static int of_platform_device_remove(struct device *dev)
 
 static void of_platform_device_shutdown(struct device *dev)
 {
-        struct of_device *of_dev = to_of_device(dev);
+        struct platform_device *of_dev = to_platform_device(dev);
         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
 
         if (dev->driver && drv->shutdown)
@@ -76,7 +173,7 @@ static void of_platform_device_shutdown(struct device *dev)
 
 static int of_platform_legacy_suspend(struct device *dev, pm_message_t mesg)
 {
-        struct of_device *of_dev = to_of_device(dev);
+        struct platform_device *of_dev = to_platform_device(dev);
         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
         int ret = 0;
 
@@ -87,7 +184,7 @@ static int of_platform_legacy_suspend(struct device *dev, pm_message_t mesg)
 
 static int of_platform_legacy_resume(struct device *dev)
 {
-        struct of_device *of_dev = to_of_device(dev);
+        struct platform_device *of_dev = to_platform_device(dev);
         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
         int ret = 0;
 
@@ -384,15 +481,286 @@ int of_bus_type_init(struct bus_type *bus, const char *name)
 
 int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
 {
-        drv->driver.bus = bus;
+        /*
+         * Temporary: of_platform_bus used to be distinct from the platform
+         * bus.  It isn't anymore, and so drivers on the platform bus need
+         * to be registered in a special way.
+         *
+         * After all of_platform_bus_type drivers are converted to
+         * platform_drivers, this exception can be removed.
+         */
+        if (bus == &platform_bus_type)
+                return of_register_platform_driver(drv);
 
         /* register with core */
+        drv->driver.bus = bus;
         return driver_register(&drv->driver);
 }
 EXPORT_SYMBOL(of_register_driver);
 
 void of_unregister_driver(struct of_platform_driver *drv)
 {
-        driver_unregister(&drv->driver);
+        if (drv->driver.bus == &platform_bus_type)
+                of_unregister_platform_driver(drv);
+        else
+                driver_unregister(&drv->driver);
 }
 EXPORT_SYMBOL(of_unregister_driver);
+
+#if !defined(CONFIG_SPARC)
+/*
+ * The following routines scan a subtree and registers a device for
+ * each applicable node.
+ *
+ * Note: sparc doesn't use these routines because it has a different
+ * mechanism for creating devices from device tree nodes.
+ */
+
+/**
+ * of_device_make_bus_id - Use the device node data to assign a unique name
+ * @dev: pointer to device structure that is linked to a device tree node
+ *
+ * This routine will first try using either the dcr-reg or the reg property
+ * value to derive a unique name.  As a last resort it will use the node
+ * name followed by a unique number.
+ */
+void of_device_make_bus_id(struct device *dev)
+{
+        static atomic_t bus_no_reg_magic;
+        struct device_node *node = dev->of_node;
+        const u32 *reg;
+        u64 addr;
+        int magic;
+
+#ifdef CONFIG_PPC_DCR
+        /*
+         * If it's a DCR based device, use 'd' for native DCRs
+         * and 'D' for MMIO DCRs.
+         */
+        reg = of_get_property(node, "dcr-reg", NULL);
+        if (reg) {
+#ifdef CONFIG_PPC_DCR_NATIVE
+                dev_set_name(dev, "d%x.%s", *reg, node->name);
+#else /* CONFIG_PPC_DCR_NATIVE */
+                u64 addr = of_translate_dcr_address(node, *reg, NULL);
+                if (addr != OF_BAD_ADDR) {
+                        dev_set_name(dev, "D%llx.%s",
+                                     (unsigned long long)addr, node->name);
+                        return;
+                }
+#endif /* !CONFIG_PPC_DCR_NATIVE */
+        }
+#endif /* CONFIG_PPC_DCR */
+
+        /*
+         * For MMIO, get the physical address
+         */
+        reg = of_get_property(node, "reg", NULL);
+        if (reg) {
+                addr = of_translate_address(node, reg);
+                if (addr != OF_BAD_ADDR) {
+                        dev_set_name(dev, "%llx.%s",
+                                     (unsigned long long)addr, node->name);
+                        return;
+                }
+        }
+
+        /*
+         * No BusID, use the node name and add a globally incremented
+         * counter (and pray...)
+         */
+        magic = atomic_add_return(1, &bus_no_reg_magic);
+        dev_set_name(dev, "%s.%d", node->name, magic - 1);
+}
+
+/**
+ * of_device_alloc - Allocate and initialize an of_device
+ * @np: device node to assign to device
+ * @bus_id: Name to assign to the device.  May be null to use default name.
+ * @parent: Parent device.
+ */
+struct platform_device *of_device_alloc(struct device_node *np,
+                                  const char *bus_id,
+                                  struct device *parent)
+{
+        struct platform_device *dev;
+        int rc, i, num_reg = 0, num_irq = 0;
+        struct resource *res, temp_res;
+
+        /* First count how many resources are needed */
+        while (of_address_to_resource(np, num_reg, &temp_res) == 0)
+                num_reg++;
+        while (of_irq_to_resource(np, num_irq, &temp_res) != NO_IRQ)
+                num_irq++;
+
+        /* Allocate memory for both the struct device and the resource table */
+        dev = kzalloc(sizeof(*dev) + (sizeof(*res) * (num_reg + num_irq)),
+                      GFP_KERNEL);
+        if (!dev)
+                return NULL;
+        res = (struct resource *) &dev[1];
+
+        /* Populate the resource table */
+        if (num_irq || num_reg) {
+                dev->num_resources = num_reg + num_irq;
+                dev->resource = res;
+                for (i = 0; i < num_reg; i++, res++) {
+                        rc = of_address_to_resource(np, i, res);
+                        WARN_ON(rc);
+                }
+                for (i = 0; i < num_irq; i++, res++) {
+                        rc = of_irq_to_resource(np, i, res);
+                        WARN_ON(rc == NO_IRQ);
+                }
+        }
+
+        dev->dev.of_node = of_node_get(np);
+#if defined(CONFIG_PPC) || defined(CONFIG_MICROBLAZE)
+        dev->dev.dma_mask = &dev->archdata.dma_mask;
+#endif
+        dev->dev.parent = parent;
+        dev->dev.release = of_release_dev;
+
+        if (bus_id)
+                dev_set_name(&dev->dev, "%s", bus_id);
+        else
+                of_device_make_bus_id(&dev->dev);
+
+        return dev;
+}
+EXPORT_SYMBOL(of_device_alloc);
+
+/**
+ * of_platform_device_create - Alloc, initialize and register an of_device
+ * @np: pointer to node to create device for
+ * @bus_id: name to assign device
+ * @parent: Linux device model parent device.
+ */
+struct platform_device *of_platform_device_create(struct device_node *np,
+                                            const char *bus_id,
+                                            struct device *parent)
+{
+        struct platform_device *dev;
+
+        dev = of_device_alloc(np, bus_id, parent);
+        if (!dev)
+                return NULL;
+
+#if defined(CONFIG_PPC) || defined(CONFIG_MICROBLAZE)
+        dev->archdata.dma_mask = 0xffffffffUL;
+#endif
+        dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+        dev->dev.bus = &platform_bus_type;
+
+        /* We do not fill the DMA ops for platform devices by default.
+         * This is currently the responsibility of the platform code
+         * to do such, possibly using a device notifier
+         */
+
+        if (of_device_register(dev) != 0) {
+                of_device_free(dev);
+                return NULL;
+        }
+
+        return dev;
+}
+EXPORT_SYMBOL(of_platform_device_create);
+
+/**
+ * of_platform_bus_create - Create an OF device for a bus node and all its
+ * children. Optionally recursively instantiate matching busses.
+ * @bus: device node of the bus to instantiate
+ * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to
+ * disallow recursive creation of child busses
+ */
+static int of_platform_bus_create(const struct device_node *bus,
+                                  const struct of_device_id *matches,
+                                  struct device *parent)
+{
+        struct device_node *child;
+        struct platform_device *dev;
+        int rc = 0;
+
+        for_each_child_of_node(bus, child) {
+                pr_debug("   create child: %s\n", child->full_name);
+                dev = of_platform_device_create(child, NULL, parent);
+                if (dev == NULL)
+                        rc = -ENOMEM;
+                else if (!of_match_node(matches, child))
+                        continue;
+                if (rc == 0) {
+                        pr_debug("   and sub busses\n");
+                        rc = of_platform_bus_create(child, matches, &dev->dev);
+                }
+                if (rc) {
+                        of_node_put(child);
+                        break;
+                }
+        }
+        return rc;
+}
+
+/**
+ * of_platform_bus_probe - Probe the device-tree for platform busses
+ * @root: parent of the first level to probe or NULL for the root of the tree
+ * @matches: match table, NULL to use the default
+ * @parent: parent to hook devices from, NULL for toplevel
+ *
+ * Note that children of the provided root are not instantiated as devices
+ * unless the specified root itself matches the bus list and is not NULL.
+ */
+int of_platform_bus_probe(struct device_node *root,
+                          const struct of_device_id *matches,
+                          struct device *parent)
+{
+        struct device_node *child;
+        struct platform_device *dev;
+        int rc = 0;
+
+        if (WARN_ON(!matches || matches == OF_NO_DEEP_PROBE))
+                return -EINVAL;
+        if (root == NULL)
+                root = of_find_node_by_path("/");
+        else
+                of_node_get(root);
+        if (root == NULL)
+                return -EINVAL;
+
+        pr_debug("of_platform_bus_probe()\n");
+        pr_debug(" starting at: %s\n", root->full_name);
+
+        /* Do a self check of bus type, if there's a match, create
+         * children
+         */
+        if (of_match_node(matches, root)) {
+                pr_debug(" root match, create all sub devices\n");
+                dev = of_platform_device_create(root, NULL, parent);
+                if (dev == NULL) {
+                        rc = -ENOMEM;
+                        goto bail;
+                }
+                pr_debug(" create all sub busses\n");
+                rc = of_platform_bus_create(root, matches, &dev->dev);
+                goto bail;
+        }
+        for_each_child_of_node(root, child) {
+                if (!of_match_node(matches, child))
+                        continue;
+
+                pr_debug("  match: %s\n", child->full_name);
+                dev = of_platform_device_create(child, NULL, parent);
+                if (dev == NULL)
+                        rc = -ENOMEM;
+                else
+                        rc = of_platform_bus_create(child, matches, &dev->dev);
+                if (rc) {
+                        of_node_put(child);
+                        break;
+                }
+        }
+ bail:
+        of_node_put(root);
+        return rc;
+}
+EXPORT_SYMBOL(of_platform_bus_probe);
+#endif /* !CONFIG_SPARC */