blob: 025012ae60cdec23c9dff86e7182fc0e94591e96 [file] [log] [blame]
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994, 1995 Waldorf GmbH
* Copyright (C) 1994 - 2000 Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
* Copyright (C) 2000 FSMLabs, Inc.
*/
#ifndef _ASM_IO_H
#define _ASM_IO_H
#include <linux/config.h>
#if 0
#include <linux/pagemap.h>
#endif
#include <asm/addrspace.h>
#include <asm/byteorder.h>
/*
* Slowdown I/O port space accesses for antique hardware.
*/
#undef CONF_SLOWDOWN_IO
/*
* Sane hardware offers swapping of I/O space accesses in hardware; less
* sane hardware forces software to fiddle with this ...
*/
#if defined(CONFIG_SWAP_IO_SPACE) && defined(__MIPSEB__)
#define __ioswab8(x) (x)
#define __ioswab16(x) swab16(x)
#define __ioswab32(x) swab32(x)
#else
#define __ioswab8(x) (x)
#define __ioswab16(x) (x)
#define __ioswab32(x) (x)
#endif
/*
* This file contains the definitions for the MIPS counterpart of the
* x86 in/out instructions. This heap of macros and C results in much
* better code than the approach of doing it in plain C. The macros
* result in code that is to fast for certain hardware. On the other
* side the performance of the string functions should be improved for
* sake of certain devices like EIDE disks that do highspeed polled I/O.
*
* Ralf
*
* This file contains the definitions for the x86 IO instructions
* inb/inw/inl/outb/outw/outl and the "string versions" of the same
* (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
* versions of the single-IO instructions (inb_p/inw_p/..).
*
* This file is not meant to be obfuscating: it's just complicated
* to (a) handle it all in a way that makes gcc able to optimize it
* as well as possible and (b) trying to avoid writing the same thing
* over and over again with slight variations and possibly making a
* mistake somewhere.
*/
/*
* On MIPS I/O ports are memory mapped, so we access them using normal
* load/store instructions. mips_io_port_base is the virtual address to
* which all ports are being mapped. For sake of efficiency some code
* assumes that this is an address that can be loaded with a single lui
* instruction, so the lower 16 bits must be zero. Should be true on
* on any sane architecture; generic code does not use this assumption.
*/
extern const unsigned long mips_io_port_base;
/*
* Gcc will generate code to load the value of mips_io_port_base after each
* function call which may be fairly wasteful in some cases. So we don't
* play quite by the book. We tell gcc mips_io_port_base is a long variable
* which solves the code generation issue. Now we need to violate the
* aliasing rules a little to make initialization possible and finally we
* will need the barrier() to fight side effects of the aliasing chat.
* This trickery will eventually collapse under gcc's optimizer. Oh well.
*/
static inline void set_io_port_base(unsigned long base)
{
* (unsigned long *) &mips_io_port_base = base;
}
/*
* Thanks to James van Artsdalen for a better timing-fix than
* the two short jumps: using outb's to a nonexistent port seems
* to guarantee better timings even on fast machines.
*
* On the other hand, I'd like to be sure of a non-existent port:
* I feel a bit unsafe about using 0x80 (should be safe, though)
*
* Linus
*
*/
#define __SLOW_DOWN_IO \
__asm__ __volatile__( \
"sb\t$0,0x80(%0)" \
: : "r" (mips_io_port_base));
#ifdef CONF_SLOWDOWN_IO
#ifdef REALLY_SLOW_IO
#define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
#else
#define SLOW_DOWN_IO __SLOW_DOWN_IO
#endif
#else
#define SLOW_DOWN_IO
#endif
/*
* Change virtual addresses to physical addresses and vv.
* These are trivial on the 1:1 Linux/MIPS mapping
*/
extern inline phys_addr_t virt_to_phys(volatile void * address)
{
return CPHYSADDR(address);
}
extern inline void * phys_to_virt(unsigned long address)
{
return (void *)KSEG0ADDR(address);
}
/*
* IO bus memory addresses are also 1:1 with the physical address
*/
extern inline unsigned long virt_to_bus(volatile void * address)
{
return CPHYSADDR(address);
}
extern inline void * bus_to_virt(unsigned long address)
{
return (void *)KSEG0ADDR(address);
}
/*
* isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
* for the processor.
*/
extern unsigned long isa_slot_offset;
extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
#if 0
extern inline void *ioremap(unsigned long offset, unsigned long size)
{
return __ioremap(offset, size, _CACHE_UNCACHED);
}
extern inline void *ioremap_nocache(unsigned long offset, unsigned long size)
{
return __ioremap(offset, size, _CACHE_UNCACHED);
}
extern void iounmap(void *addr);
#endif
/*
* XXX We need system specific versions of these to handle EISA address bits
* 24-31 on SNI.
* XXX more SNI hacks.
*/
#define readb(addr) (*(volatile unsigned char *)(addr))
#define readw(addr) __ioswab16((*(volatile unsigned short *)(addr)))
#define readl(addr) __ioswab32((*(volatile unsigned int *)(addr)))
#define __raw_readb readb
#define __raw_readw readw
#define __raw_readl readl
#define writeb(b,addr) (*(volatile unsigned char *)(addr)) = (b)
#define writew(b,addr) (*(volatile unsigned short *)(addr)) = (__ioswab16(b))
#define writel(b,addr) (*(volatile unsigned int *)(addr)) = (__ioswab32(b))
#define __raw_writeb writeb
#define __raw_writew writew
#define __raw_writel writel
#define memset_io(a,b,c) memset((void *)(a),(b),(c))
#define memcpy_fromio(a,b,c) memcpy((a),(void *)(b),(c))
#define memcpy_toio(a,b,c) memcpy((void *)(a),(b),(c))
/* END SNI HACKS ... */
/*
* ISA space is 'always mapped' on currently supported MIPS systems, no need
* to explicitly ioremap() it. The fact that the ISA IO space is mapped
* to PAGE_OFFSET is pure coincidence - it does not mean ISA values
* are physical addresses. The following constant pointer can be
* used as the IO-area pointer (it can be iounmapped as well, so the
* analogy with PCI is quite large):
*/
#define __ISA_IO_base ((char *)(PAGE_OFFSET))
#define isa_readb(a) readb(a)
#define isa_readw(a) readw(a)
#define isa_readl(a) readl(a)
#define isa_writeb(b,a) writeb(b,a)
#define isa_writew(w,a) writew(w,a)
#define isa_writel(l,a) writel(l,a)
#define isa_memset_io(a,b,c) memset_io((a),(b),(c))
#define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),(b),(c))
#define isa_memcpy_toio(a,b,c) memcpy_toio((a),(b),(c))
/*
* We don't have csum_partial_copy_fromio() yet, so we cheat here and
* just copy it. The net code will then do the checksum later.
*/
#define eth_io_copy_and_sum(skb,src,len,unused) memcpy_fromio((skb)->data,(src),(len))
#define isa_eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(b),(c),(d))
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;
}
#define isa_check_signature(io, s, l) check_signature(i,s,l)
/*
* Talk about misusing macros..
*/
#define __OUT1(s) \
extern inline void __out##s(unsigned int value, unsigned int port) {
#define __OUT2(m) \
__asm__ __volatile__ ("s" #m "\t%0,%1(%2)"
#define __OUT(m,s,w) \
__OUT1(s) __OUT2(m) : : "r" (__ioswab##w(value)), "i" (0), "r" (mips_io_port_base+port)); } \
__OUT1(s##c) __OUT2(m) : : "r" (__ioswab##w(value)), "ir" (port), "r" (mips_io_port_base)); } \
__OUT1(s##_p) __OUT2(m) : : "r" (__ioswab##w(value)), "i" (0), "r" (mips_io_port_base+port)); \
SLOW_DOWN_IO; } \
__OUT1(s##c_p) __OUT2(m) : : "r" (__ioswab##w(value)), "ir" (port), "r" (mips_io_port_base)); \
SLOW_DOWN_IO; }
#define __IN1(t,s) \
extern __inline__ t __in##s(unsigned int port) { t _v;
/*
* Required nops will be inserted by the assembler
*/
#define __IN2(m) \
__asm__ __volatile__ ("l" #m "\t%0,%1(%2)"
#define __IN(t,m,s,w) \
__IN1(t,s) __IN2(m) : "=r" (_v) : "i" (0), "r" (mips_io_port_base+port)); return __ioswab##w(_v); } \
__IN1(t,s##c) __IN2(m) : "=r" (_v) : "ir" (port), "r" (mips_io_port_base)); return __ioswab##w(_v); } \
__IN1(t,s##_p) __IN2(m) : "=r" (_v) : "i" (0), "r" (mips_io_port_base+port)); SLOW_DOWN_IO; return __ioswab##w(_v); } \
__IN1(t,s##c_p) __IN2(m) : "=r" (_v) : "ir" (port), "r" (mips_io_port_base)); SLOW_DOWN_IO; return __ioswab##w(_v); }
#define __INS1(s) \
extern inline void __ins##s(unsigned int port, void * addr, unsigned long count) {
#define __INS2(m) \
if (count) \
__asm__ __volatile__ ( \
".set\tnoreorder\n\t" \
".set\tnoat\n" \
"1:\tl" #m "\t$1,%4(%5)\n\t" \
"subu\t%1,1\n\t" \
"s" #m "\t$1,(%0)\n\t" \
"bne\t$0,%1,1b\n\t" \
"addiu\t%0,%6\n\t" \
".set\tat\n\t" \
".set\treorder"
#define __INS(m,s,i) \
__INS1(s) __INS2(m) \
: "=r" (addr), "=r" (count) \
: "0" (addr), "1" (count), "i" (0), \
"r" (mips_io_port_base+port), "I" (i) \
: "$1");} \
__INS1(s##c) __INS2(m) \
: "=r" (addr), "=r" (count) \
: "0" (addr), "1" (count), "ir" (port), \
"r" (mips_io_port_base), "I" (i) \
: "$1");}
#define __OUTS1(s) \
extern inline void __outs##s(unsigned int port, const void * addr, unsigned long count) {
#define __OUTS2(m) \
if (count) \
__asm__ __volatile__ ( \
".set\tnoreorder\n\t" \
".set\tnoat\n" \
"1:\tl" #m "\t$1,(%0)\n\t" \
"subu\t%1,1\n\t" \
"s" #m "\t$1,%4(%5)\n\t" \
"bne\t$0,%1,1b\n\t" \
"addiu\t%0,%6\n\t" \
".set\tat\n\t" \
".set\treorder"
#define __OUTS(m,s,i) \
__OUTS1(s) __OUTS2(m) \
: "=r" (addr), "=r" (count) \
: "0" (addr), "1" (count), "i" (0), "r" (mips_io_port_base+port), "I" (i) \
: "$1");} \
__OUTS1(s##c) __OUTS2(m) \
: "=r" (addr), "=r" (count) \
: "0" (addr), "1" (count), "ir" (port), "r" (mips_io_port_base), "I" (i) \
: "$1");}
__IN(unsigned char,b,b,8)
__IN(unsigned short,h,w,16)
__IN(unsigned int,w,l,32)
__OUT(b,b,8)
__OUT(h,w,16)
__OUT(w,l,32)
__INS(b,b,1)
__INS(h,w,2)
__INS(w,l,4)
__OUTS(b,b,1)
__OUTS(h,w,2)
__OUTS(w,l,4)
/*
* Note that due to the way __builtin_constant_p() works, you
* - can't use it inside an inline function (it will never be true)
* - you don't have to worry about side effects within the __builtin..
*/
#define outb(val,port) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__outbc((val),(port)) : \
__outb((val),(port)))
#define inb(port) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__inbc(port) : \
__inb(port))
#define outb_p(val,port) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__outbc_p((val),(port)) : \
__outb_p((val),(port)))
#define inb_p(port) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__inbc_p(port) : \
__inb_p(port))
#define outw(val,port) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__outwc((val),(port)) : \
__outw((val),(port)))
#define inw(port) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__inwc(port) : \
__inw(port))
#define outw_p(val,port) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__outwc_p((val),(port)) : \
__outw_p((val),(port)))
#define inw_p(port) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__inwc_p(port) : \
__inw_p(port))
#define outl(val,port) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__outlc((val),(port)) : \
__outl((val),(port)))
#define inl(port) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__inlc(port) : \
__inl(port))
#define outl_p(val,port) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__outlc_p((val),(port)) : \
__outl_p((val),(port)))
#define inl_p(port) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__inlc_p(port) : \
__inl_p(port))
#define outsb(port,addr,count) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__outsbc((port),(addr),(count)) : \
__outsb ((port),(addr),(count)))
#define insb(port,addr,count) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__insbc((port),(addr),(count)) : \
__insb((port),(addr),(count)))
#define outsw(port,addr,count) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__outswc((port),(addr),(count)) : \
__outsw ((port),(addr),(count)))
#define insw(port,addr,count) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__inswc((port),(addr),(count)) : \
__insw((port),(addr),(count)))
#define outsl(port,addr,count) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__outslc((port),(addr),(count)) : \
__outsl ((port),(addr),(count)))
#define insl(port,addr,count) \
((__builtin_constant_p((port)) && (port) < 32768) ? \
__inslc((port),(addr),(count)) : \
__insl((port),(addr),(count)))
#define IO_SPACE_LIMIT 0xffff
/*
* 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 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_wback(start, size) makes caches and 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.
*/
extern void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
extern void (*_dma_cache_wback)(unsigned long start, unsigned long size);
extern void (*_dma_cache_inv)(unsigned long start, unsigned long size);
#define dma_cache_wback_inv(start,size) _dma_cache_wback_inv(start,size)
#define dma_cache_wback(start,size) _dma_cache_wback(start,size)
#define dma_cache_inv(start,size) _dma_cache_inv(start,size)
static inline void sync(void)
{
}
/*
* Given a physical address and a length, return a virtual address
* that can be used to access the memory range with the caching
* properties specified by "flags".
*/
#define MAP_NOCACHE (0)
#define MAP_WRCOMBINE (0)
#define MAP_WRBACK (0)
#define MAP_WRTHROUGH (0)
static inline void *
map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
{
return (void *)paddr;
}
/*
* Take down a mapping set up by map_physmem().
*/
static inline void unmap_physmem(void *vaddr, unsigned long flags)
{
}
#endif /* _ASM_IO_H */