1 /* Generic I/O port emulation, based on MN10300 code
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
11 #ifndef __ASM_GENERIC_IO_H
12 #define __ASM_GENERIC_IO_H
14 #include <asm/page.h> /* I/O is all done through memory accesses */
15 #include <linux/string.h> /* for memset() and memcpy() */
16 #include <linux/types.h>
18 #ifdef CONFIG_GENERIC_IOMAP
19 #include <asm-generic/iomap.h>
22 #include <asm-generic/pci_iomap.h>
25 #define mmiowb() do {} while (0)
29 * __raw_{read,write}{b,w,l,q}() access memory in native endianness.
31 * On some architectures memory mapped IO needs to be accessed differently.
32 * On the simple architectures, we just read/write the memory location
37 #define __raw_readb __raw_readb
38 static inline u8 __raw_readb(const volatile void __iomem *addr)
40 return *(const volatile u8 __force *)addr;
45 #define __raw_readw __raw_readw
46 static inline u16 __raw_readw(const volatile void __iomem *addr)
48 return *(const volatile u16 __force *)addr;
53 #define __raw_readl __raw_readl
54 static inline u32 __raw_readl(const volatile void __iomem *addr)
56 return *(const volatile u32 __force *)addr;
62 #define __raw_readq __raw_readq
63 static inline u64 __raw_readq(const volatile void __iomem *addr)
65 return *(const volatile u64 __force *)addr;
68 #endif /* CONFIG_64BIT */
71 #define __raw_writeb __raw_writeb
72 static inline void __raw_writeb(u8 value, volatile void __iomem *addr)
74 *(volatile u8 __force *)addr = value;
79 #define __raw_writew __raw_writew
80 static inline void __raw_writew(u16 value, volatile void __iomem *addr)
82 *(volatile u16 __force *)addr = value;
87 #define __raw_writel __raw_writel
88 static inline void __raw_writel(u32 value, volatile void __iomem *addr)
90 *(volatile u32 __force *)addr = value;
96 #define __raw_writeq __raw_writeq
97 static inline void __raw_writeq(u64 value, volatile void __iomem *addr)
99 *(volatile u64 __force *)addr = value;
102 #endif /* CONFIG_64BIT */
105 * {read,write}{b,w,l,q}() access little endian memory and return result in
111 static inline u8 readb(const volatile void __iomem *addr)
113 return __raw_readb(addr);
119 static inline u16 readw(const volatile void __iomem *addr)
121 return __le16_to_cpu(__raw_readw(addr));
127 static inline u32 readl(const volatile void __iomem *addr)
129 return __le32_to_cpu(__raw_readl(addr));
136 static inline u64 readq(const volatile void __iomem *addr)
138 return __le64_to_cpu(__raw_readq(addr));
141 #endif /* CONFIG_64BIT */
144 #define writeb writeb
145 static inline void writeb(u8 value, volatile void __iomem *addr)
147 __raw_writeb(value, addr);
152 #define writew writew
153 static inline void writew(u16 value, volatile void __iomem *addr)
155 __raw_writew(cpu_to_le16(value), addr);
160 #define writel writel
161 static inline void writel(u32 value, volatile void __iomem *addr)
163 __raw_writel(__cpu_to_le32(value), addr);
169 #define writeq writeq
170 static inline void writeq(u64 value, volatile void __iomem *addr)
172 __raw_writeq(__cpu_to_le64(value), addr);
175 #endif /* CONFIG_64BIT */
178 * {read,write}{b,w,l,q}_relaxed() are like the regular version, but
179 * are not guaranteed to provide ordering against spinlocks or memory
182 #ifndef readb_relaxed
183 #define readb_relaxed readb
186 #ifndef readw_relaxed
187 #define readw_relaxed readw
190 #ifndef readl_relaxed
191 #define readl_relaxed readl
194 #if defined(readq) && !defined(readq_relaxed)
195 #define readq_relaxed readq
198 #ifndef writeb_relaxed
199 #define writeb_relaxed writeb
202 #ifndef writew_relaxed
203 #define writew_relaxed writew
206 #ifndef writel_relaxed
207 #define writel_relaxed writel
210 #if defined(writeq) && !defined(writeq_relaxed)
211 #define writeq_relaxed writeq
215 * {read,write}s{b,w,l,q}() repeatedly access the same memory address in
216 * native endianness in 8-, 16-, 32- or 64-bit chunks (@count times).
219 #define readsb readsb
220 static inline void readsb(const volatile void __iomem *addr, void *buffer,
227 u8 x = __raw_readb(addr);
235 #define readsw readsw
236 static inline void readsw(const volatile void __iomem *addr, void *buffer,
243 u16 x = __raw_readw(addr);
251 #define readsl readsl
252 static inline void readsl(const volatile void __iomem *addr, void *buffer,
259 u32 x = __raw_readl(addr);
268 #define readsq readsq
269 static inline void readsq(const volatile void __iomem *addr, void *buffer,
276 u64 x = __raw_readq(addr);
282 #endif /* CONFIG_64BIT */
285 #define writesb writesb
286 static inline void writesb(volatile void __iomem *addr, const void *buffer,
290 const u8 *buf = buffer;
293 __raw_writeb(*buf++, addr);
300 #define writesw writesw
301 static inline void writesw(volatile void __iomem *addr, const void *buffer,
305 const u16 *buf = buffer;
308 __raw_writew(*buf++, addr);
315 #define writesl writesl
316 static inline void writesl(volatile void __iomem *addr, const void *buffer,
320 const u32 *buf = buffer;
323 __raw_writel(*buf++, addr);
331 #define writesq writesq
332 static inline void writesq(volatile void __iomem *addr, const void *buffer,
336 const u64 *buf = buffer;
339 __raw_writeq(*buf++, addr);
344 #endif /* CONFIG_64BIT */
347 #define PCI_IOBASE ((void __iomem *)0)
350 #ifndef IO_SPACE_LIMIT
351 #define IO_SPACE_LIMIT 0xffff
355 * {in,out}{b,w,l}() access little endian I/O. {in,out}{b,w,l}_p() can be
356 * implemented on hardware that needs an additional delay for I/O accesses to
362 static inline u8 inb(unsigned long addr)
364 return readb(PCI_IOBASE + addr);
370 static inline u16 inw(unsigned long addr)
372 return readw(PCI_IOBASE + addr);
378 static inline u32 inl(unsigned long addr)
380 return readl(PCI_IOBASE + addr);
386 static inline void outb(u8 value, unsigned long addr)
388 writeb(value, PCI_IOBASE + addr);
394 static inline void outw(u16 value, unsigned long addr)
396 writew(value, PCI_IOBASE + addr);
402 static inline void outl(u32 value, unsigned long addr)
404 writel(value, PCI_IOBASE + addr);
410 static inline u8 inb_p(unsigned long addr)
418 static inline u16 inw_p(unsigned long addr)
426 static inline u32 inl_p(unsigned long addr)
433 #define outb_p outb_p
434 static inline void outb_p(u8 value, unsigned long addr)
441 #define outw_p outw_p
442 static inline void outw_p(u16 value, unsigned long addr)
449 #define outl_p outl_p
450 static inline void outl_p(u32 value, unsigned long addr)
457 * {in,out}s{b,w,l}{,_p}() are variants of the above that repeatedly access a
458 * single I/O port multiple times.
463 static inline void insb(unsigned long addr, void *buffer, unsigned int count)
465 readsb(PCI_IOBASE + addr, buffer, count);
471 static inline void insw(unsigned long addr, void *buffer, unsigned int count)
473 readsw(PCI_IOBASE + addr, buffer, count);
479 static inline void insl(unsigned long addr, void *buffer, unsigned int count)
481 readsl(PCI_IOBASE + addr, buffer, count);
487 static inline void outsb(unsigned long addr, const void *buffer,
490 writesb(PCI_IOBASE + addr, buffer, count);
496 static inline void outsw(unsigned long addr, const void *buffer,
499 writesw(PCI_IOBASE + addr, buffer, count);
505 static inline void outsl(unsigned long addr, const void *buffer,
508 writesl(PCI_IOBASE + addr, buffer, count);
513 #define insb_p insb_p
514 static inline void insb_p(unsigned long addr, void *buffer, unsigned int count)
516 insb(addr, buffer, count);
521 #define insw_p insw_p
522 static inline void insw_p(unsigned long addr, void *buffer, unsigned int count)
524 insw(addr, buffer, count);
529 #define insl_p insl_p
530 static inline void insl_p(unsigned long addr, void *buffer, unsigned int count)
532 insl(addr, buffer, count);
537 #define outsb_p outsb_p
538 static inline void outsb_p(unsigned long addr, const void *buffer,
541 outsb(addr, buffer, count);
546 #define outsw_p outsw_p
547 static inline void outsw_p(unsigned long addr, const void *buffer,
550 outsw(addr, buffer, count);
555 #define outsl_p outsl_p
556 static inline void outsl_p(unsigned long addr, const void *buffer,
559 outsl(addr, buffer, count);
563 #ifndef CONFIG_GENERIC_IOMAP
565 #define ioread8 ioread8
566 static inline u8 ioread8(const volatile void __iomem *addr)
573 #define ioread16 ioread16
574 static inline u16 ioread16(const volatile void __iomem *addr)
581 #define ioread32 ioread32
582 static inline u32 ioread32(const volatile void __iomem *addr)
590 #define ioread64 ioread64
591 static inline u64 ioread64(const volatile void __iomem *addr)
596 #endif /* CONFIG_64BIT */
599 #define iowrite8 iowrite8
600 static inline void iowrite8(u8 value, volatile void __iomem *addr)
607 #define iowrite16 iowrite16
608 static inline void iowrite16(u16 value, volatile void __iomem *addr)
615 #define iowrite32 iowrite32
616 static inline void iowrite32(u32 value, volatile void __iomem *addr)
624 #define iowrite64 iowrite64
625 static inline void iowrite64(u64 value, volatile void __iomem *addr)
630 #endif /* CONFIG_64BIT */
633 #define ioread16be ioread16be
634 static inline u16 ioread16be(const volatile void __iomem *addr)
636 return swab16(readw(addr));
641 #define ioread32be ioread32be
642 static inline u32 ioread32be(const volatile void __iomem *addr)
644 return swab32(readl(addr));
650 #define ioread64be ioread64be
651 static inline u64 ioread64be(const volatile void __iomem *addr)
653 return swab64(readq(addr));
656 #endif /* CONFIG_64BIT */
659 #define iowrite16be iowrite16be
660 static inline void iowrite16be(u16 value, void volatile __iomem *addr)
662 writew(swab16(value), addr);
667 #define iowrite32be iowrite32be
668 static inline void iowrite32be(u32 value, volatile void __iomem *addr)
670 writel(swab32(value), addr);
676 #define iowrite64be iowrite64be
677 static inline void iowrite64be(u64 value, volatile void __iomem *addr)
679 writeq(swab64(value), addr);
682 #endif /* CONFIG_64BIT */
685 #define ioread8_rep ioread8_rep
686 static inline void ioread8_rep(const volatile void __iomem *addr, void *buffer,
689 readsb(addr, buffer, count);
694 #define ioread16_rep ioread16_rep
695 static inline void ioread16_rep(const volatile void __iomem *addr,
696 void *buffer, unsigned int count)
698 readsw(addr, buffer, count);
703 #define ioread32_rep ioread32_rep
704 static inline void ioread32_rep(const volatile void __iomem *addr,
705 void *buffer, unsigned int count)
707 readsl(addr, buffer, count);
713 #define ioread64_rep ioread64_rep
714 static inline void ioread64_rep(const volatile void __iomem *addr,
715 void *buffer, unsigned int count)
717 readsq(addr, buffer, count);
720 #endif /* CONFIG_64BIT */
723 #define iowrite8_rep iowrite8_rep
724 static inline void iowrite8_rep(volatile void __iomem *addr,
728 writesb(addr, buffer, count);
732 #ifndef iowrite16_rep
733 #define iowrite16_rep iowrite16_rep
734 static inline void iowrite16_rep(volatile void __iomem *addr,
738 writesw(addr, buffer, count);
742 #ifndef iowrite32_rep
743 #define iowrite32_rep iowrite32_rep
744 static inline void iowrite32_rep(volatile void __iomem *addr,
748 writesl(addr, buffer, count);
753 #ifndef iowrite64_rep
754 #define iowrite64_rep iowrite64_rep
755 static inline void iowrite64_rep(volatile void __iomem *addr,
759 writesq(addr, buffer, count);
762 #endif /* CONFIG_64BIT */
763 #endif /* CONFIG_GENERIC_IOMAP */
767 #include <linux/vmalloc.h>
768 #define __io_virt(x) ((void __force *)(x))
770 #ifndef CONFIG_GENERIC_IOMAP
772 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
775 #define pci_iounmap pci_iounmap
776 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
780 #endif /* CONFIG_GENERIC_IOMAP */
783 * Change virtual addresses to physical addresses and vv.
784 * These are pretty trivial
787 #define virt_to_phys virt_to_phys
788 static inline unsigned long virt_to_phys(volatile void *address)
790 return __pa((unsigned long)address);
795 #define phys_to_virt phys_to_virt
796 static inline void *phys_to_virt(unsigned long address)
798 return __va(address);
803 * DOC: ioremap() and ioremap_*() variants
805 * If you have an IOMMU your architecture is expected to have both ioremap()
806 * and iounmap() implemented otherwise the asm-generic helpers will provide a
809 * There are ioremap_*() call variants, if you have no IOMMU we naturally will
810 * default to direct mapping for all of them, you can override these defaults.
811 * If you have an IOMMU you are highly encouraged to provide your own
812 * ioremap variant implementation as there currently is no safe architecture
813 * agnostic default. To avoid possible improper behaviour default asm-generic
814 * ioremap_*() variants all return NULL when an IOMMU is available. If you've
815 * defined your own ioremap_*() variant you must then declare your own
816 * ioremap_*() variant as defined to itself to avoid the default NULL return.
822 #define ioremap_uc ioremap_uc
823 static inline void __iomem *ioremap_uc(phys_addr_t offset, size_t size)
829 #else /* !CONFIG_MMU */
832 * Change "struct page" to physical address.
834 * This implementation is for the no-MMU case only... if you have an MMU
835 * you'll need to provide your own definitions.
839 #define ioremap ioremap
840 static inline void __iomem *ioremap(phys_addr_t offset, size_t size)
842 return (void __iomem *)(unsigned long)offset;
847 #define __ioremap __ioremap
848 static inline void __iomem *__ioremap(phys_addr_t offset, size_t size,
851 return ioremap(offset, size);
855 #ifndef ioremap_nocache
856 #define ioremap_nocache ioremap_nocache
857 static inline void __iomem *ioremap_nocache(phys_addr_t offset, size_t size)
859 return ioremap(offset, size);
864 #define ioremap_uc ioremap_uc
865 static inline void __iomem *ioremap_uc(phys_addr_t offset, size_t size)
867 return ioremap_nocache(offset, size);
872 #define ioremap_wc ioremap_wc
873 static inline void __iomem *ioremap_wc(phys_addr_t offset, size_t size)
875 return ioremap_nocache(offset, size);
880 #define ioremap_wt ioremap_wt
881 static inline void __iomem *ioremap_wt(phys_addr_t offset, size_t size)
883 return ioremap_nocache(offset, size);
888 #define iounmap iounmap
890 static inline void iounmap(void __iomem *addr)
894 #endif /* CONFIG_MMU */
896 #ifdef CONFIG_HAS_IOPORT_MAP
897 #ifndef CONFIG_GENERIC_IOMAP
899 #define ioport_map ioport_map
900 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
902 return PCI_IOBASE + (port & IO_SPACE_LIMIT);
907 #define ioport_unmap ioport_unmap
908 static inline void ioport_unmap(void __iomem *p)
912 #else /* CONFIG_GENERIC_IOMAP */
913 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
914 extern void ioport_unmap(void __iomem *p);
915 #endif /* CONFIG_GENERIC_IOMAP */
916 #endif /* CONFIG_HAS_IOPORT_MAP */
919 * Convert a virtual cached pointer to an uncached pointer
921 #ifndef xlate_dev_kmem_ptr
922 #define xlate_dev_kmem_ptr xlate_dev_kmem_ptr
923 static inline void *xlate_dev_kmem_ptr(void *addr)
929 #ifndef xlate_dev_mem_ptr
930 #define xlate_dev_mem_ptr xlate_dev_mem_ptr
931 static inline void *xlate_dev_mem_ptr(phys_addr_t addr)
937 #ifndef unxlate_dev_mem_ptr
938 #define unxlate_dev_mem_ptr unxlate_dev_mem_ptr
939 static inline void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
944 #ifdef CONFIG_VIRT_TO_BUS
946 static inline unsigned long virt_to_bus(void *address)
948 return (unsigned long)address;
951 static inline void *bus_to_virt(unsigned long address)
953 return (void *)address;
959 #define memset_io memset_io
961 * memset_io Set a range of I/O memory to a constant value
962 * @addr: The beginning of the I/O-memory range to set
963 * @val: The value to set the memory to
964 * @count: The number of bytes to set
966 * Set a range of I/O memory to a given value.
968 static inline void memset_io(volatile void __iomem *addr, int value,
971 memset(__io_virt(addr), value, size);
975 #ifndef memcpy_fromio
976 #define memcpy_fromio memcpy_fromio
978 * memcpy_fromio Copy a block of data from I/O memory
979 * @dst: The (RAM) destination for the copy
980 * @src: The (I/O memory) source for the data
981 * @count: The number of bytes to copy
983 * Copy a block of data from I/O memory.
985 static inline void memcpy_fromio(void *buffer,
986 const volatile void __iomem *addr,
989 memcpy(buffer, __io_virt(addr), size);
994 #define memcpy_toio memcpy_toio
996 * memcpy_toio Copy a block of data into I/O memory
997 * @dst: The (I/O memory) destination for the copy
998 * @src: The (RAM) source for the data
999 * @count: The number of bytes to copy
1001 * Copy a block of data to I/O memory.
1003 static inline void memcpy_toio(volatile void __iomem *addr, const void *buffer,
1006 memcpy(__io_virt(addr), buffer, size);
1010 #endif /* __KERNEL__ */
1012 #endif /* __ASM_GENERIC_IO_H */