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#ifndef __ASM_SH_IO_H
#define __ASM_SH_IO_H
* Convention:
* read{b,w,l}/write{b,w,l} are for PCI,
* while in{b,w,l}/out{b,w,l} are for ISA
* These may (will) be platform specific function.
* In addition we have 'pausing' versions: in{b,w,l}_p/out{b,w,l}_p
* and 'string' versions: ins{b,w,l}/outs{b,w,l}
* For read{b,w,l} and write{b,w,l} there are also __raw versions, which
* do not have a memory barrier after them.
* In addition, we have
* ctrl_in{b,w,l}/ctrl_out{b,w,l} for SuperH specific I/O.
* which are processor specific.
* We follow the Alpha convention here:
* __inb expands to an inline function call (which calls via the mv)
* _inb is a real function call (note ___raw fns are _ version of __raw)
* inb by default expands to _inb, but the machine specific code may
* define it to __inb if it chooses.
#include <asm/cache.h>
#include <asm/system.h>
#include <asm/addrspace.h>
#include <asm/machvec.h>
#include <linux/config.h>
* Depending on which platform we are running on, we need different
* I/O functions.
#ifdef __KERNEL__
* Since boards are able to define their own set of I/O routines through
* their respective machine vector, we always wrap through the mv.
* Also, in the event that a board hasn't provided its own definition for
* a given routine, it will be wrapped to generic code at run-time.
# define __inb(p) sh_mv.mv_inb((p))
# define __inw(p) sh_mv.mv_inw((p))
# define __inl(p) sh_mv.mv_inl((p))
# define __outb(x,p) sh_mv.mv_outb((x),(p))
# define __outw(x,p) sh_mv.mv_outw((x),(p))
# define __outl(x,p) sh_mv.mv_outl((x),(p))
# define __inb_p(p) sh_mv.mv_inb_p((p))
# define __inw_p(p) sh_mv.mv_inw_p((p))
# define __inl_p(p) sh_mv.mv_inl_p((p))
# define __outb_p(x,p) sh_mv.mv_outb_p((x),(p))
# define __outw_p(x,p) sh_mv.mv_outw_p((x),(p))
# define __outl_p(x,p) sh_mv.mv_outl_p((x),(p))
# define __insb(p,b,c) sh_mv.mv_insb((p), (b), (c))
# define __insw(p,b,c) sh_mv.mv_insw((p), (b), (c))
# define __insl(p,b,c) sh_mv.mv_insl((p), (b), (c))
# define __outsb(p,b,c) sh_mv.mv_outsb((p), (b), (c))
# define __outsw(p,b,c) sh_mv.mv_outsw((p), (b), (c))
# define __outsl(p,b,c) sh_mv.mv_outsl((p), (b), (c))
# define __readb(a) sh_mv.mv_readb((a))
# define __readw(a) sh_mv.mv_readw((a))
# define __readl(a) sh_mv.mv_readl((a))
# define __writeb(v,a) sh_mv.mv_writeb((v),(a))
# define __writew(v,a) sh_mv.mv_writew((v),(a))
# define __writel(v,a) sh_mv.mv_writel((v),(a))
# define __ioremap(a,s) sh_mv.mv_ioremap((a), (s))
# define __iounmap(a) sh_mv.mv_iounmap((a))
# define __isa_port2addr(a) sh_mv.mv_isa_port2addr(a)
# define inb __inb
# define inw __inw
# define inl __inl
# define outb __outb
# define outw __outw
# define outl __outl
# define inb_p __inb_p
# define inw_p __inw_p
# define inl_p __inl_p
# define outb_p __outb_p
# define outw_p __outw_p
# define outl_p __outl_p
# define insb __insb
# define insw __insw
# define insl __insl
# define outsb __outsb
# define outsw __outsw
# define outsl __outsl
# define __raw_readb __readb
# define __raw_readw __readw
# define __raw_readl __readl
# define __raw_writeb __writeb
# define __raw_writew __writew
# define __raw_writel __writel
* The platform header files may define some of these macros to use
* the inlined versions where appropriate. These macros may also be
* redefined by userlevel programs.
#ifdef __raw_readb
# define readb(a) ({ unsigned long r_ = __raw_readb((unsigned long)a); mb(); r_; })
#ifdef __raw_readw
# define readw(a) ({ unsigned long r_ = __raw_readw((unsigned long)a); mb(); r_; })
#ifdef __raw_readl
# define readl(a) ({ unsigned long r_ = __raw_readl((unsigned long)a); mb(); r_; })
#ifdef __raw_writeb
# define writeb(v,a) ({ __raw_writeb((v),(unsigned long)(a)); mb(); })
#ifdef __raw_writew
# define writew(v,a) ({ __raw_writew((v),(unsigned long)(a)); mb(); })
#ifdef __raw_writel
# define writel(v,a) ({ __raw_writel((v),(unsigned long)(a)); mb(); })
#define readb_relaxed(a) readb(a)
#define readw_relaxed(a) readw(a)
#define readl_relaxed(a) readl(a)
#define mmiowb()
* If the platform has PC-like I/O, this function converts the offset into
* an address.
static __inline__ unsigned long isa_port2addr(unsigned long offset)
return __isa_port2addr(offset);
* This function provides a method for the generic case where a board-specific
* isa_port2addr simply needs to return the port + some arbitrary port base.
* We use this at board setup time to implicitly set the port base, and
* as a result, we can use the generic isa_port2addr.
static inline void __set_io_port_base(unsigned long pbase)
extern unsigned long generic_io_base;
generic_io_base = pbase;
#define isa_readb(a) readb(isa_port2addr(a))
#define isa_readw(a) readw(isa_port2addr(a))
#define isa_readl(a) readl(isa_port2addr(a))
#define isa_writeb(b,a) writeb(b,isa_port2addr(a))
#define isa_writew(w,a) writew(w,isa_port2addr(a))
#define isa_writel(l,a) writel(l,isa_port2addr(a))
#define isa_memset_io(a,b,c) \
memset((void *)(isa_port2addr((unsigned long)a)),(b),(c))
#define isa_memcpy_fromio(a,b,c) \
memcpy((a),(void *)(isa_port2addr((unsigned long)(b))),(c))
#define isa_memcpy_toio(a,b,c) \
memcpy((void *)(isa_port2addr((unsigned long)(a))),(b),(c))
/* We really want to try and get these to memcpy etc */
extern void memcpy_fromio(void *, unsigned long, unsigned long);
extern void memcpy_toio(unsigned long, const void *, unsigned long);
extern void memset_io(unsigned long, int, unsigned long);
/* SuperH on-chip I/O functions */
static __inline__ unsigned char ctrl_inb(unsigned long addr)
return *(volatile unsigned char*)addr;
static __inline__ unsigned short ctrl_inw(unsigned long addr)
return *(volatile unsigned short*)addr;
static __inline__ unsigned int ctrl_inl(unsigned long addr)
return *(volatile unsigned long*)addr;
static __inline__ void ctrl_outb(unsigned char b, unsigned long addr)
*(volatile unsigned char*)addr = b;
static __inline__ void ctrl_outw(unsigned short b, unsigned long addr)
*(volatile unsigned short*)addr = b;
static __inline__ void ctrl_outl(unsigned int b, unsigned long addr)
*(volatile unsigned long*)addr = b;
#define IO_SPACE_LIMIT 0xffffffff
* Change virtual addresses to physical addresses and vv.
* These are trivial on the 1:1 Linux/SuperH mapping
static __inline__ unsigned long virt_to_phys(volatile void * address)
return PHYSADDR(address);
static __inline__ void * phys_to_virt(unsigned long address)
return (void *)P1SEGADDR(address);
#define virt_to_bus virt_to_phys
#define bus_to_virt phys_to_virt
#define page_to_bus page_to_phys
* readX/writeX() are used to access memory mapped devices. On some
* architectures the memory mapped IO stuff needs to be accessed
* differently. On the x86 architecture, we just read/write the
* memory location directly.
* On SH, we have the whole physical address space mapped at all times
* (as MIPS does), so "ioremap()" and "iounmap()" do not need to do
* anything. (This isn't true for all machines but we still handle
* these cases with wired TLB entries anyway ...)
* We cheat a bit and always return uncachable areas until we've fixed
* the drivers to handle caching properly.
static __inline__ void * ioremap(unsigned long offset, unsigned long size)
return __ioremap(offset, size);
static __inline__ void iounmap(void *addr)
return __iounmap(addr);
#define ioremap_nocache(off,size) ioremap(off,size)
static __inline__ int check_signature(unsigned long io_addr,
const unsigned char *signature, int length)
int retval = 0;
do {
if (readb(io_addr) != *signature)
goto out;
} while (length);
retval = 1;
return retval;
* The caches on some architectures aren't dma-coherent and have need to
* handle this in software. There are three types of operations that
* can be applied to dma buffers.
* - dma_cache_wback_inv(start, size) makes caches and RAM coherent by
* writing the content of the caches back to memory, if necessary.
* The function also invalidates the affected part of the caches as
* necessary before DMA transfers from outside to memory.
* - dma_cache_inv(start, size) invalidates the affected parts of the
* caches. Dirty lines of the caches may be written back or simply
* be discarded. This operation is necessary before dma operations
* to the memory.
* - dma_cache_wback(start, size) writes back any dirty lines but does
* not invalidate the cache. This can be used before DMA reads from
* memory,
#define dma_cache_wback_inv(_start,_size) \
#define dma_cache_inv(_start,_size) \
#define dma_cache_wback(_start,_size) \
* Convert a physical pointer to a virtual kernel pointer for /dev/mem
* access
#define xlate_dev_mem_ptr(p) __va(p)
* Convert a virtual cached pointer to an uncached pointer
#define xlate_dev_kmem_ptr(p) p
#endif /* __KERNEL__ */
#endif /* __ASM_SH_IO_H */