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Diffstat (limited to 'arch/mips/include/asm/io.h')
| -rw-r--r-- | arch/mips/include/asm/io.h | 492 |
1 files changed, 492 insertions, 0 deletions
diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h new file mode 100644 index 0000000..025012a --- /dev/null +++ b/arch/mips/include/asm/io.h @@ -0,0 +1,492 @@ +/* + * 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 */ |