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 #ifndef 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 #ifndef 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)
589 #define iowrite8 iowrite8
590 static inline void iowrite8(u8 value, volatile void __iomem *addr)
597 #define iowrite16 iowrite16
598 static inline void iowrite16(u16 value, volatile void __iomem *addr)
605 #define iowrite32 iowrite32
606 static inline void iowrite32(u32 value, volatile void __iomem *addr)
613 #define ioread16be ioread16be
614 static inline u16 ioread16be(const volatile void __iomem *addr)
616 return __be16_to_cpu(__raw_readw(addr));
621 #define ioread32be ioread32be
622 static inline u32 ioread32be(const volatile void __iomem *addr)
624 return __be32_to_cpu(__raw_readl(addr));
629 #define iowrite16be iowrite16be
630 static inline void iowrite16be(u16 value, void volatile __iomem *addr)
632 __raw_writew(__cpu_to_be16(value), addr);
637 #define iowrite32be iowrite32be
638 static inline void iowrite32be(u32 value, volatile void __iomem *addr)
640 __raw_writel(__cpu_to_be32(value), addr);
645 #define ioread8_rep ioread8_rep
646 static inline void ioread8_rep(const volatile void __iomem *addr, void *buffer,
649 readsb(addr, buffer, count);
654 #define ioread16_rep ioread16_rep
655 static inline void ioread16_rep(const volatile void __iomem *addr,
656 void *buffer, unsigned int count)
658 readsw(addr, buffer, count);
663 #define ioread32_rep ioread32_rep
664 static inline void ioread32_rep(const volatile void __iomem *addr,
665 void *buffer, unsigned int count)
667 readsl(addr, buffer, count);
672 #define iowrite8_rep iowrite8_rep
673 static inline void iowrite8_rep(volatile void __iomem *addr,
677 writesb(addr, buffer, count);
681 #ifndef iowrite16_rep
682 #define iowrite16_rep iowrite16_rep
683 static inline void iowrite16_rep(volatile void __iomem *addr,
687 writesw(addr, buffer, count);
691 #ifndef iowrite32_rep
692 #define iowrite32_rep iowrite32_rep
693 static inline void iowrite32_rep(volatile void __iomem *addr,
697 writesl(addr, buffer, count);
700 #endif /* CONFIG_GENERIC_IOMAP */
704 #include <linux/vmalloc.h>
705 #define __io_virt(x) ((void __force *)(x))
707 #ifndef CONFIG_GENERIC_IOMAP
709 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
712 #define pci_iounmap pci_iounmap
713 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
717 #endif /* CONFIG_GENERIC_IOMAP */
720 * Change virtual addresses to physical addresses and vv.
721 * These are pretty trivial
724 #define virt_to_phys virt_to_phys
725 static inline unsigned long virt_to_phys(volatile void *address)
727 return __pa((unsigned long)address);
732 #define phys_to_virt phys_to_virt
733 static inline void *phys_to_virt(unsigned long address)
735 return __va(address);
740 * Change "struct page" to physical address.
742 * This implementation is for the no-MMU case only... if you have an MMU
743 * you'll need to provide your own definitions.
748 #define ioremap ioremap
749 static inline void __iomem *ioremap(phys_addr_t offset, size_t size)
751 return (void __iomem *)(unsigned long)offset;
756 #define __ioremap __ioremap
757 static inline void __iomem *__ioremap(phys_addr_t offset, size_t size,
760 return ioremap(offset, size);
764 #ifndef ioremap_nocache
765 #define ioremap_nocache ioremap_nocache
766 static inline void __iomem *ioremap_nocache(phys_addr_t offset, size_t size)
768 return ioremap(offset, size);
773 #define ioremap_wc ioremap_wc
774 static inline void __iomem *ioremap_wc(phys_addr_t offset, size_t size)
776 return ioremap_nocache(offset, size);
781 #define iounmap iounmap
782 static inline void iounmap(void __iomem *addr)
786 #endif /* CONFIG_MMU */
788 #ifdef CONFIG_HAS_IOPORT_MAP
789 #ifndef CONFIG_GENERIC_IOMAP
791 #define ioport_map ioport_map
792 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
794 return PCI_IOBASE + (port & IO_SPACE_LIMIT);
799 #define ioport_unmap ioport_unmap
800 static inline void ioport_unmap(void __iomem *p)
804 #else /* CONFIG_GENERIC_IOMAP */
805 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
806 extern void ioport_unmap(void __iomem *p);
807 #endif /* CONFIG_GENERIC_IOMAP */
808 #endif /* CONFIG_HAS_IOPORT_MAP */
810 #ifndef xlate_dev_kmem_ptr
811 #define xlate_dev_kmem_ptr xlate_dev_kmem_ptr
812 static inline void *xlate_dev_kmem_ptr(void *addr)
818 #ifndef xlate_dev_mem_ptr
819 #define xlate_dev_mem_ptr xlate_dev_mem_ptr
820 static inline void *xlate_dev_mem_ptr(phys_addr_t addr)
826 #ifndef unxlate_dev_mem_ptr
827 #define unxlate_dev_mem_ptr unxlate_dev_mem_ptr
828 static inline void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
833 #ifdef CONFIG_VIRT_TO_BUS
835 static inline unsigned long virt_to_bus(void *address)
837 return (unsigned long)address;
840 static inline void *bus_to_virt(unsigned long address)
842 return (void *)address;
848 #define memset_io memset_io
849 static inline void memset_io(volatile void __iomem *addr, int value,
852 memset(__io_virt(addr), value, size);
856 #ifndef memcpy_fromio
857 #define memcpy_fromio memcpy_fromio
858 static inline void memcpy_fromio(void *buffer,
859 const volatile void __iomem *addr,
862 memcpy(buffer, __io_virt(addr), size);
867 #define memcpy_toio memcpy_toio
868 static inline void memcpy_toio(volatile void __iomem *addr, const void *buffer,
871 memcpy(__io_virt(addr), buffer, size);
875 #endif /* __KERNEL__ */
877 #endif /* __ASM_GENERIC_IO_H */