[POWERPC] Move of_device allocation into of_device.[ch]

Extract generic of_device allocation code from of_platform_device_create()
and move it into of_device.[ch], called of_device_alloc(). Also, there's now
of_device_free() which puts the device node.

This way, bus drivers that build on of_platform (like ibmebus will) can
build upon this code instead of reinventing the wheel.

Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>

4 files changed, 91 insertions, 68 deletions

diff --git a/arch/powerpc/kernel/of_device.c b/arch/powerpc/kernel/of_device.c
index 8f3db32fac8b..3388ad619996 100644
--- a/arch/powerpc/kernel/of_device.c
+++ b/arch/powerpc/kernel/of_device.c
@@ -7,8 +7,88 @@
 #include <linux/slab.h>
 
 #include <asm/errno.h>
+#include <asm/dcr.h>
 #include <asm/of_device.h>
 
+static void of_device_make_bus_id(struct of_device *dev)
+{
+        static atomic_t bus_no_reg_magic;
+        struct device_node *node = dev->node;
+        char *name = dev->dev.bus_id;
+        const u32 *reg;
+        u64 addr;
+        int magic;
+
+        /*
+         * If it's a DCR based device, use 'd' for native DCRs
+         * and 'D' for MMIO DCRs.
+         */
+#ifdef CONFIG_PPC_DCR
+        reg = of_get_property(node, "dcr-reg", NULL);
+        if (reg) {
+#ifdef CONFIG_PPC_DCR_NATIVE
+                snprintf(name, BUS_ID_SIZE, "d%x.%s",
+                         *reg, node->name);
+#else /* CONFIG_PPC_DCR_NATIVE */
+                addr = of_translate_dcr_address(node, *reg, NULL);
+                if (addr != OF_BAD_ADDR) {
+                        snprintf(name, BUS_ID_SIZE,
+                                 "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) {
+                        snprintf(name, BUS_ID_SIZE,
+                                 "%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);
+        snprintf(name, BUS_ID_SIZE, "%s.%d", node->name, magic - 1);
+}
+
+struct of_device *of_device_alloc(struct device_node *np,
+                                  const char *bus_id,
+                                  struct device *parent)
+{
+        struct of_device *dev;
+
+        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+        if (!dev)
+                return NULL;
+
+        dev->node = of_node_get(np);
+        dev->dev.dma_mask = &dev->dma_mask;
+        dev->dev.parent = parent;
+        dev->dev.release = of_release_dev;
+        dev->dev.archdata.of_node = np;
+        dev->dev.archdata.numa_node = of_node_to_nid(np);
+
+        if (bus_id)
+                strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
+        else
+                of_device_make_bus_id(dev);
+
+        return dev;
+}
+EXPORT_SYMBOL(of_device_alloc);
+
 ssize_t of_device_get_modalias(struct of_device *ofdev,
                                 char *str, ssize_t len)
 {
diff --git a/arch/powerpc/kernel/of_platform.c b/arch/powerpc/kernel/of_platform.c
index eca8ccc3fa12..aeaa20268ce2 100644
--- a/arch/powerpc/kernel/of_platform.c
+++ b/arch/powerpc/kernel/of_platform.c
@@ -23,7 +23,6 @@
 #include <linux/of_platform.h>
 
 #include <asm/errno.h>
-#include <asm/dcr.h>
 #include <asm/topology.h>
 #include <asm/pci-bridge.h>
 #include <asm/ppc-pci.h>
@@ -53,8 +52,6 @@ static struct of_device_id of_default_bus_ids[] = {
         {},
 };
 
-static atomic_t bus_no_reg_magic;
-
 struct bus_type of_platform_bus_type = {
        .uevent  = of_device_uevent,
 };
@@ -87,89 +84,26 @@ void of_unregister_platform_driver(struct of_platform_driver *drv)
 }
 EXPORT_SYMBOL(of_unregister_platform_driver);
 
-static void of_platform_make_bus_id(struct of_device *dev)
-{
-        struct device_node *node = dev->node;
-        char *name = dev->dev.bus_id;
-        const u32 *reg;
-        u64 addr;
-        int magic;
-
-        /*
-         * If it's a DCR based device, use 'd' for native DCRs
-         * and 'D' for MMIO DCRs.
-         */
-#ifdef CONFIG_PPC_DCR
-        reg = of_get_property(node, "dcr-reg", NULL);
-        if (reg) {
-#ifdef CONFIG_PPC_DCR_NATIVE
-                snprintf(name, BUS_ID_SIZE, "d%x.%s",
-                         *reg, node->name);
-#else /* CONFIG_PPC_DCR_NATIVE */
-                addr = of_translate_dcr_address(node, *reg, NULL);
-                if (addr != OF_BAD_ADDR) {
-                        snprintf(name, BUS_ID_SIZE,
-                                 "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) {
-                        snprintf(name, BUS_ID_SIZE,
-                                 "%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);
-        snprintf(name, BUS_ID_SIZE, "%s.%d", node->name, magic - 1);
-}
-
 struct of_device* of_platform_device_create(struct device_node *np,
                                             const char *bus_id,
                                             struct device *parent)
 {
         struct of_device *dev;
 
-        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+        dev = of_device_alloc(np, bus_id, parent);
         if (!dev)
                 return NULL;
 
-        dev->node = of_node_get(np);
         dev->dma_mask = 0xffffffffUL;
-        dev->dev.dma_mask = &dev->dma_mask;
-        dev->dev.parent = parent;
         dev->dev.bus = &of_platform_bus_type;
-        dev->dev.release = of_release_dev;
-        dev->dev.archdata.of_node = np;
-        dev->dev.archdata.numa_node = of_node_to_nid(np);
 
         /* 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 (bus_id)
-                strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
-        else
-                of_platform_make_bus_id(dev);
-
         if (of_device_register(dev) != 0) {
-                kfree(dev);
+                of_device_free(dev);
                 return NULL;
         }
 
diff --git a/include/asm-powerpc/of_device.h b/include/asm-powerpc/of_device.h
index 93262f2546ad..6526e139a463 100644
--- a/include/asm-powerpc/of_device.h
+++ b/include/asm-powerpc/of_device.h
@@ -17,6 +17,10 @@ struct of_device
         struct device           dev;            /* Generic device interface */
 };
 
+extern struct of_device *of_device_alloc(struct device_node *np,
+                                         const char *bus_id,
+                                         struct device *parent);
+
 extern ssize_t of_device_get_modalias(struct of_device *ofdev,
                                         char *str, ssize_t len);
 extern int of_device_uevent(struct device *dev,
diff --git a/include/linux/of_device.h b/include/linux/of_device.h
index 91bf84b9d144..212bffb2b174 100644
--- a/include/linux/of_device.h
+++ b/include/linux/of_device.h
@@ -22,5 +22,10 @@ extern int of_device_register(struct of_device *ofdev);
 extern void of_device_unregister(struct of_device *ofdev);
 extern void of_release_dev(struct device *dev);
 
+static inline void of_device_free(struct of_device *dev)
+{
+        of_release_dev(&dev->dev);
+}
+
 #endif /* __KERNEL__ */
 #endif /* _LINUX_OF_DEVICE_H */