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- #ifndef __ASM_MIPS_IO_H
- #define __ASM_MIPS_IO_H
-
- /*
- * Slowdown I/O port space accesses for antique hardware.
- */
- #undef CONF_SLOWDOWN_IO
-
- #include <asm/mipsconfig.h>
- #include <asm/addrspace.h>
-
- /*
- * 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 unsigned long mips_io_port_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 unsigned long virt_to_phys(volatile void * address)
- {
- return PHYSADDR(address);
- }
-
- extern inline void * phys_to_virt(unsigned long address)
- {
- return (void *)KSEG0ADDR(address);
- }
-
- extern void * ioremap(unsigned long phys_addr, unsigned long size);
- extern void iounmap(void *addr);
-
- /*
- * IO bus memory addresses are also 1:1 with the physical address
- */
- extern inline unsigned long virt_to_bus(volatile void * address)
- {
- return PHYSADDR(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 is mapped
- * for the processor.
- */
- extern unsigned long isa_slot_offset;
-
- /*
- * 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 MIPS, we have the whole physical address space mapped at all
- * times, 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 *) KSEG1ADDR(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 *) KSEG1ADDR(offset);
- }
-
- extern inline void iounmap(void *addr)
- {
- }
-
- /*
- * XXX We need system specific versions of these to handle EISA address bits
- * 24-31 on SNI.
- */
- #define readb(addr) (*(volatile unsigned char *) (isa_slot_offset + (unsigned long)(addr)))
- #define readw(addr) (*(volatile unsigned short *) (isa_slot_offset + (unsigned long)(addr)))
- #define readl(addr) (*(volatile unsigned int *) (isa_slot_offset + (unsigned long)(addr)))
-
- #define writeb(b,addr) (*(volatile unsigned char *) (isa_slot_offset + (unsigned long)(addr)) = (b))
- #define writew(b,addr) (*(volatile unsigned short *) (isa_slot_offset + (unsigned long)(addr)) = (b))
- #define writel(b,addr) (*(volatile unsigned int *) (isa_slot_offset + (unsigned long)(addr)) = (b))
-
- #define memset_io(a,b,c) memset((void *)(isa_slot_offset + (unsigned long)a),(b),(c))
- #define memcpy_fromio(a,b,c) memcpy((a),(void *)(isa_slot_offset + (unsigned long)(b)),(c))
- #define memcpy_toio(a,b,c) memcpy((void *)(isa_slot_offset + (unsigned long)(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))
-
- 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;
- }
-
- /*
- * 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) \
- __OUT1(s) __OUT2(m) : : "r" (value), "i" (0), "r" (mips_io_port_base+port)); } \
- __OUT1(s##c) __OUT2(m) : : "r" (value), "ir" (port), "r" (mips_io_port_base)); } \
- __OUT1(s##_p) __OUT2(m) : : "r" (value), "i" (0), "r" (mips_io_port_base+port)); \
- SLOW_DOWN_IO; } \
- __OUT1(s##c_p) __OUT2(m) : : "r" (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) \
- __IN1(t,s) __IN2(m) : "=r" (_v) : "i" (0), "r" (mips_io_port_base+port)); return _v; } \
- __IN1(t,s##c) __IN2(m) : "=r" (_v) : "ir" (port), "r" (mips_io_port_base)); return _v; } \
- __IN1(t,s##_p) __IN2(m) : "=r" (_v) : "i" (0), "r" (mips_io_port_base+port)); SLOW_DOWN_IO; return _v; } \
- __IN1(t,s##c_p) __IN2(m) : "=r" (_v) : "ir" (port), "r" (mips_io_port_base)); SLOW_DOWN_IO; return _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)
- __IN(unsigned short,h,w)
- __IN(unsigned int,w,l)
-
- __OUT(b,b)
- __OUT(h,w)
- __OUT(w,l)
-
- __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)))
-
- /*
- * The caches on some architectures aren't dma-coherent and have need to
- * handle this in software. There are two 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_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_inv)(unsigned long start, unsigned long size);
-
- #endif /* __ASM_MIPS_IO_H */
-