of: Merge of_device_alloc() and of_device_make_bus_id()

This patch merges the common routines of_device_alloc() and
of_device_make_bus_id() from powerpc and microblaze.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
CC: Michal Simek <monstr@monstr.eu>
CC: Grant Likely <grant.likely@secretlab.ca>
CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Stephen Rothwell <sfr@canb.auug.org.au>
CC: microblaze-uclinux@itee.uq.edu.au
CC: linuxppc-dev@ozlabs.org
CC: devicetree-discuss@lists.ozlabs.org

arch/microblaze/include/asm/of_device.h

@@ -10,19 +10,4 @@
 
 #ifndef _ASM_MICROBLAZE_OF_DEVICE_H
 #define _ASM_MICROBLAZE_OF_DEVICE_H
-#ifdef __KERNEL__
-
-#include <linux/device.h>
-#include <linux/of.h>
-
-extern struct of_device *of_device_alloc(struct device_node *np,
-					 const char *bus_id,
-					 struct device *parent);
-
-extern void of_device_make_bus_id(struct of_device *dev);
-
-/* This is just here during the transition */
-#include <linux/of_device.h>
-
-#endif /* __KERNEL__ */
 #endif /* _ASM_MICROBLAZE_OF_DEVICE_H */

arch/microblaze/kernel/Makefile

@@ -15,7 +15,7 @@ endif
 extra-y := head.o vmlinux.lds
 
 obj-y += dma.o exceptions.o \
-	hw_exception_handler.o init_task.o intc.o irq.o of_device.o \
+	hw_exception_handler.o init_task.o intc.o irq.o \
 	of_platform.o process.o prom.o prom_parse.o ptrace.o \
 	setup.o signal.o sys_microblaze.o timer.o traps.o reset.o
 

arch/powerpc/include/asm/of_device.h

@@ -1,13 +1,3 @@
 #ifndef _ASM_POWERPC_OF_DEVICE_H
 #define _ASM_POWERPC_OF_DEVICE_H
-#ifdef __KERNEL__
-
-#include <linux/device.h>
-#include <linux/of.h>
-
-extern struct of_device *of_device_alloc(struct device_node *np,
-					 const char *bus_id,
-					 struct device *parent);
-
-#endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_OF_DEVICE_H */

arch/powerpc/kernel/Makefile

@@ -40,7 +40,7 @@ obj-$(CONFIG_PPC_BOOK3E_64)	+= exceptions-64e.o
 obj-$(CONFIG_PPC64)		+= vdso64/
 obj-$(CONFIG_ALTIVEC)		+= vecemu.o
 obj-$(CONFIG_PPC_970_NAP)	+= idle_power4.o
-obj-$(CONFIG_PPC_OF)		+= of_device.o of_platform.o prom_parse.o
+obj-$(CONFIG_PPC_OF)		+= of_platform.o prom_parse.o
 obj-$(CONFIG_PPC_CLOCK)		+= clock.o
 procfs-y			:= proc_powerpc.o
 obj-$(CONFIG_PROC_FS)		+= $(procfs-y)

drivers/of/platform.c

@@ -407,6 +407,93 @@ EXPORT_SYMBOL(of_unregister_driver);
  * 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.
+ */
+static 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 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->dev.of_node = of_node_get(np);
+	dev->dev.dma_mask = &dev->archdata.dma_mask;
+	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

include/linux/of_platform.h

@@ -60,6 +60,9 @@ static inline void of_unregister_platform_driver(struct of_platform_driver *drv)
 	of_unregister_driver(drv);
 }
 
+extern struct of_device *of_device_alloc(struct device_node *np,
+					 const char *bus_id,
+					 struct device *parent);
 #include <asm/of_platform.h>
 
 extern struct of_device *of_find_device_by_node(struct device_node *np);