unicore32: replace unicore32-specific iomap functions with generic lib implementation

1. define and enable CONFIG_GENERIC_IOMAP
2. define unicore32-specific PCI_IOBASE for asm-generic/io.h
3. define HAVE_ARCH_PIO_SIZE and unicore32-specific PIO_* macros
4. remove all unicore32-specific iomap functions

Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Reviewed-and-Acked-by: Arnd Bergmann <arnd@arndb.de>

arch/unicore32/Kconfig

@@ -30,6 +30,9 @@ config GENERIC_CLOCKEVENTS
 config GENERIC_CSUM
 	def_bool y
 
+config GENERIC_IOMAP
+	def_bool y
+
 config NO_IOPORT
 	bool
 

arch/unicore32/include/asm/io.h

@@ -18,6 +18,7 @@
 #include <asm/memory.h>
 #include <asm/system.h>
 
+#define PCI_IOBASE	io_p2v(PKUNITY_PCILIO_BASE)
 #include <asm-generic/io.h>
 
 /*
@@ -38,9 +39,6 @@ extern void __uc32_iounmap(volatile void __iomem *addr);
 #define ioremap_cached(cookie, size)	__uc32_ioremap_cached(cookie, size)
 #define iounmap(cookie)			__uc32_iounmap(cookie)
 
-extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
-extern void ioport_unmap(void __iomem *addr);
-
 /*
  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
  * access
@@ -48,5 +46,10 @@ extern void ioport_unmap(void __iomem *addr);
 #undef xlate_dev_mem_ptr
 #define xlate_dev_mem_ptr(p)	__va(p)
 
+#define HAVE_ARCH_PIO_SIZE
+#define PIO_OFFSET		(unsigned int)(PCI_IOBASE)
+#define PIO_MASK		(unsigned int)(IO_SPACE_LIMIT)
+#define PIO_RESERVED		(PIO_OFFSET + PIO_MASK + 1)
+
 #endif	/* __KERNEL__ */
 #endif	/* __UNICORE_IO_H__ */

arch/unicore32/mm/Makefile

@@ -3,7 +3,7 @@
 #
 
 obj-y				:= extable.o fault.o init.o pgd.o mmu.o
-obj-y				+= iomap.o flush.o ioremap.o
+obj-y				+= flush.o ioremap.o
 
 obj-$(CONFIG_SWIOTLB)		+= dma-swiotlb.o
 

arch/unicore32/mm/iomap.c

@@ -1,56 +0,0 @@
-/*
- * linux/arch/unicore32/mm/iomap.c
- *
- * Code specific to PKUnity SoC and UniCore ISA
- *
- * Copyright (C) 2001-2010 GUAN Xue-tao
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Map IO port and PCI memory spaces so that {read,write}[bwl] can
- * be used to access this memory.
- */
-#include <linux/module.h>
-#include <linux/pci.h>
-#include <linux/ioport.h>
-#include <linux/io.h>
-
-#ifdef __io
-void __iomem *ioport_map(unsigned long port, unsigned int nr)
-{
-	/* we map PC lagcy 64K IO port to PCI IO space 0x80030000 */
-	return (void __iomem *) (unsigned long)
-			io_p2v((port & 0xffff) + PKUNITY_PCILIO_BASE);
-}
-EXPORT_SYMBOL(ioport_map);
-
-void ioport_unmap(void __iomem *addr)
-{
-}
-EXPORT_SYMBOL(ioport_unmap);
-#endif
-
-#ifdef CONFIG_PCI
-void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
-{
-	resource_size_t start = pci_resource_start(dev, bar);
-	resource_size_t len   = pci_resource_len(dev, bar);
-	unsigned long flags = pci_resource_flags(dev, bar);
-
-	if (!len || !start)
-		return NULL;
-	if (maxlen && len > maxlen)
-		len = maxlen;
-	if (flags & IORESOURCE_IO)
-		return ioport_map(start, len);
-	if (flags & IORESOURCE_MEM) {
-		if (flags & IORESOURCE_CACHEABLE)
-			return ioremap(start, len);
-		return ioremap_nocache(start, len);
-	}
-	return NULL;
-}
-EXPORT_SYMBOL(pci_iomap);
-#endif