io.h
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上传日期:2013-04-10
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- /*
- * linux/include/asm-arm/arch-l7200/io.h
- *
- * Copyright (C) 2000 Steve Hill (sjhill@cotw.com)
- *
- * Changelog:
- * 03-21-2000 SJH Created from linux/include/asm-arm/arch-nexuspci/io.h
- * 08-31-2000 SJH Added in IO functions necessary for new drivers
- */
- #ifndef __ASM_ARM_ARCH_IO_H
- #define __ASM_ARM_ARCH_IO_H
- #include <asm/arch/hardware.h>
- #define IO_SPACE_LIMIT 0xffffffff
- /*
- * There are not real ISA nor PCI buses, so we fake it.
- */
- #define __io_pci(a) (PCIO_BASE + (a))
- #define __mem_pci(a) ((unsigned long)(a))
- #define __mem_isa(a) ((unsigned long)(a))
- #define __ioaddr(p) __io_pci(p)
- /*
- * Generic virtual read/write
- */
- #define __arch_getb(a) (*(volatile unsigned char *)(a))
- #define __arch_getl(a) (*(volatile unsigned int *)(a))
- static inline unsigned int __arch_getw(unsigned long a)
- {
- unsigned int value;
- __asm__ __volatile__("ldr%?h %0, [%1, #0] @ getw"
- : "=&r" (value)
- : "r" (a));
- return value;
- }
- #define __arch_putb(v,a) (*(volatile unsigned char *)(a) = (v))
- #define __arch_putl(v,a) (*(volatile unsigned int *)(a) = (v))
- static inline void __arch_putw(unsigned int value, unsigned long a)
- {
- __asm__ __volatile__("str%?h %0, [%1, #0] @ putw"
- : : "r" (value), "r" (a));
- }
- /*
- * Translated address IO functions
- *
- * IO address has already been translated to a virtual address
- */
- #define outb_t(v,p) (*(volatile unsigned char *)(p) = (v))
- #define inb_t(p) (*(volatile unsigned char *)(p))
- #define outw_t(v,p) (*(volatile unsigned int *)(p) = (v))
- #define inw_t(p) (*(volatile unsigned int *)(p))
- #define outl_t(v,p) (*(volatile unsigned long *)(p) = (v))
- #define inl_t(p) (*(volatile unsigned long *)(p))
- /*
- * FIXME - These are to allow for linking. On all the other
- * ARM platforms, the entire IO space is contiguous.
- * The 7200 has three separate IO spaces. The below
- * macros will eventually become more involved. Use
- * with caution and don't be surprised by kernel oopses!!!
- */
- #define inb(p) inb_t(p)
- #define inw(p) inw_t(p)
- #define inl(p) inl_t(p)
- #define outb(v,p) outb_t(v,p)
- #define outw(v,p) outw_t(v,p)
- #define outl(v,p) outl_t(v,p)
- #define __arch_ioremap __ioremap
- #endif