[POWERPC] devres: Add devm_ioremap_prot()

We provide an ioremap_flags, so this provides a corresponding
devm_ioremap_prot.  The slight name difference is at Ben
Herrenschmidt's request as he plans on changing ioremap_flags to
ioremap_prot in the future.

Signed-off-by: Emil Medve <Emilian.Medve@Freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Tejun Heo <htejun@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/lib/Makefile

@@ -23,3 +23,4 @@ obj-$(CONFIG_SMP)	+= locks.o
 endif
 
 obj-$(CONFIG_PPC_LIB_RHEAP) += rheap.o
+obj-$(CONFIG_HAS_IOMEM)	+= devres.o

arch/powerpc/lib/devres.c

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2008 Freescale Semiconductor, Inc.
+ *
+ * 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.
+ */
+
+#include <linux/device.h>	/* devres_*(), devm_ioremap_release() */
+#include <linux/io.h>		/* ioremap_flags() */
+#include <linux/module.h>	/* EXPORT_SYMBOL() */
+
+/**
+ * devm_ioremap_prot - Managed ioremap_flags()
+ * @dev: Generic device to remap IO address for
+ * @offset: BUS offset to map
+ * @size: Size of map
+ * @flags: Page flags
+ *
+ * Managed ioremap_prot().  Map is automatically unmapped on driver
+ * detach.
+ */
+void __iomem *devm_ioremap_prot(struct device *dev, resource_size_t offset,
+				 size_t size, unsigned long flags)
+{
+	void __iomem **ptr, *addr;
+
+	ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return NULL;
+
+	addr = ioremap_flags(offset, size, flags);
+	if (addr) {
+		*ptr = addr;
+		devres_add(dev, ptr);
+	} else
+		devres_free(ptr);
+
+	return addr;
+}
+EXPORT_SYMBOL(devm_ioremap_prot);

include/asm-powerpc/io.h

@@ -2,7 +2,7 @@
 #define _ASM_POWERPC_IO_H
 #ifdef __KERNEL__
 
-/* 
+/*
  * 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
@@ -18,6 +18,9 @@ extern int check_legacy_ioport(unsigned long base_port);
 #define _PNPWRP		0xa79
 #define PNPBIOS_BASE	0xf000
 
+#include <linux/device.h>
+#include <linux/io.h>
+
 #include <linux/compiler.h>
 #include <asm/page.h>
 #include <asm/byteorder.h>
@@ -744,6 +747,9 @@ static inline void * bus_to_virt(unsigned long address)
 
 #define clrsetbits_8(addr, clear, set) clrsetbits(8, addr, clear, set)
 
+void __iomem *devm_ioremap_prot(struct device *dev, resource_size_t offset,
+				size_t size, unsigned long flags);
+
 #endif /* __KERNEL__ */
 
 #endif /* _ASM_POWERPC_IO_H */

include/linux/io.h

@@ -65,5 +65,6 @@ void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
 void devm_iounmap(struct device *dev, void __iomem *addr);
 int check_signature(const volatile void __iomem *io_addr,
 			const unsigned char *signature, int length);
+void devm_ioremap_release(struct device *dev, void *res);
 
 #endif /* _LINUX_IO_H */

lib/devres.c

@@ -2,7 +2,7 @@
 #include <linux/io.h>
 #include <linux/module.h>
 
-static void devm_ioremap_release(struct device *dev, void *res)
+void devm_ioremap_release(struct device *dev, void *res)
 {
 	iounmap(*(void __iomem **)res);
 }