path: root/include/asm-sh/io.h

#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 
 *   ctrl_in{b,w,l}/ctrl_out{b,w,l} for SuperH specific I/O.
 *   which are processor specific.
 */

#include <asm/cache.h>

#define inb_p	inb
#define outb_p	outb

#define inw_p	inw
#define outw_p	outw

#define virt_to_bus virt_to_phys
#define bus_to_virt phys_to_virt

extern __inline__ unsigned long readb(unsigned long addr)
{
	return *(volatile unsigned char*)addr;
}

extern __inline__ unsigned long readw(unsigned long addr)
{
	return *(volatile unsigned short*)addr;
}

extern __inline__ unsigned long readl(unsigned long addr)
{
	return *(volatile unsigned long*)addr;
}

extern __inline__ void writeb(unsigned char b, unsigned long addr)
{
	*(volatile unsigned char*)addr = b;
}

extern __inline__ void writew(unsigned short b, unsigned long addr)
{
	*(volatile unsigned short*)addr = b;
}

extern __inline__ void writel(unsigned int b, unsigned long addr)
{
        *(volatile unsigned long*)addr = b;
}

extern __inline__ unsigned long inb_local(unsigned long addr)
{
	return readb(addr);
}

extern __inline__ void outb_local(unsigned char b, unsigned long addr)
{
	return writeb(b,addr);
}

extern __inline__ unsigned long inb(unsigned long addr)
{
	return readb(addr);
}

extern __inline__ unsigned long inw(unsigned long addr)
{
	return readw(addr);
}

extern __inline__ unsigned long inl(unsigned long addr)
{
	return readl(addr);
}

extern __inline__ void insb(unsigned long addr, void *buffer, int count)
{
	unsigned char *buf=buffer;
	while(count--) *buf++=inb(addr);
}

extern __inline__ void insw(unsigned long addr, void *buffer, int count)
{
	unsigned short *buf=buffer;
	while(count--) *buf++=inw(addr);
}

extern __inline__ void insl(unsigned long addr, void *buffer, int count)
{
	unsigned long *buf=buffer;
	while(count--) *buf++=inl(addr);
}

extern __inline__ void outb(unsigned char b, unsigned long addr)
{
       return writeb(b,addr);
}

extern __inline__ void outw(unsigned short b, unsigned long addr)
{
       return writew(b,addr);
}

extern __inline__ void outl(unsigned int b, unsigned long addr)
{
       return writel(b,addr);
}

extern __inline__ void outsb(unsigned long addr, const void *buffer, int count)
{
	const unsigned char *buf=buffer;
	while(count--) outb(*buf++, addr);
}

extern __inline__ void outsw(unsigned long addr, const void *buffer, int count)
{
	const unsigned short *buf=buffer;
	while(count--) outw(*buf++, addr);
}

extern __inline__ void outsl(unsigned long addr, const void *buffer, int count)
{
	const unsigned long *buf=buffer;
	while(count--) outl(*buf++, addr);
}

#define ctrl_in(addr)		*(addr)
#define ctrl_out(data,addr)	*(addr) = (data)

extern __inline__ unsigned long ctrl_inb(unsigned long addr)
{
       return *(volatile unsigned char*)addr;
}

extern __inline__ unsigned long ctrl_inw(unsigned long addr)
{
       return *(volatile unsigned short*)addr;
}

extern __inline__ unsigned long ctrl_inl(unsigned long addr)
{
       return *(volatile unsigned long*)addr;
}

extern __inline__ void ctrl_outb(unsigned char b, unsigned long addr)
{
       *(volatile unsigned char*)addr = b;
}

extern __inline__ void ctrl_outw(unsigned short b, unsigned long addr)
{
	*(volatile unsigned short*)addr = b;
}

extern __inline__ void ctrl_outl(unsigned int b, unsigned long addr)
{
        *(volatile unsigned long*)addr = b;
}

#ifdef __KERNEL__

#define IO_SPACE_LIMIT 0xffffffff

#include <asm/addrspace.h>

/*
 * Change virtual addresses to physical addresses and vv.
 * These are trivial on the 1:1 Linux/SuperH mapping
 */
extern __inline__ unsigned long virt_to_phys(volatile void * address)
{
	return PHYSADDR(address);
}

extern __inline__ void * phys_to_virt(unsigned long address)
{
	return (void *)P1SEGADDR(address);
}

extern void * ioremap(unsigned long phys_addr, unsigned long size);
extern void iounmap(void *addr);

/*
 * 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.  
 */
extern __inline__ void * ioremap(unsigned long offset, unsigned long size)
{
	return (void *) P2SEGADDR(offset);
}

/*
 * This one maps high address device memory and turns off caching for that area.
 * it's useful if some control registers are in such an area and write combining
 * or read caching is not desirable:
 */
extern __inline__ void * ioremap_nocache (unsigned long offset, unsigned long size)
{
	return (void *) P2SEGADDR(offset);
}

extern __inline__ void iounmap(void *addr)
{
}

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;
		io_addr++;
		signature++;
		length--;
	} while (length);
	retval = 1;
out:
	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) \
    cache_flush_area((unsigned long)(_start),((unsigned long)(_start)+(_size)))
#define dma_cache_inv(_start,_size) \
    cache_purge_area((unsigned long)(_start),((unsigned long)(_start)+(_size)))
#define dma_cache_wback(_start,_size) \
    cache_wback_area((unsigned long)(_start),((unsigned long)(_start)+(_size)))

#endif /* __KERNEL__ */
#endif /* __ASM_SH_IO_H */