include/asm-sh/io.h

   1 /*
   2  *  linux/include/asm-sh/io.h
   3  *
   4  *  Copyright (C) 1996-2000 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * Modifications:
  11  *  16-Sep-1996 RMK     Inlined the inx/outx functions & optimised for both
  12  *                      constant addresses and variable addresses.
  13  *  04-Dec-1997 RMK     Moved a lot of this stuff to the new architecture
  14  *                      specific IO header files.
  15  *  27-Mar-1999 PJB     Second parameter of memcpy_toio is const..
  16  *  04-Apr-1999 PJB     Added check_signature.
  17  *  12-Dec-1999 RMK     More cleanups
  18  *  18-Jun-2000 RMK     Removed virt_to_* and friends definitions
  19  */
  20 #ifndef __ASM_SH_IO_H
  21 #define __ASM_SH_IO_H
  22
  23 #ifdef __KERNEL__
  24
  25 #include <linux/types.h>
  26 #include <asm/byteorder.h>
  27
  28 /*
  29  * Generic virtual read/write.  Note that we don't support half-word
  30  * read/writes.  We define __arch_*[bl] here, and leave __arch_*w
  31  * to the architecture specific code.
  32  */
  33 #define __arch_getb(a)                  (*(volatile unsigned char *)(a))
  34 #define __arch_getw(a)                  (*(volatile unsigned short *)(a))
  35 #define __arch_getl(a)                  (*(volatile unsigned int *)(a))
  36
  37 #define __arch_putb(v,a)                (*(volatile unsigned char *)(a) = (v))
  38 #define __arch_putw(v,a)                (*(volatile unsigned short *)(a) = (v))
  39 #define __arch_putl(v,a)                (*(volatile unsigned int *)(a) = (v))
  40
  41 extern void __raw_writesb(unsigned int addr, const void *data, int bytelen);
  42 extern void __raw_writesw(unsigned int addr, const void *data, int wordlen);
  43 extern void __raw_writesl(unsigned int addr, const void *data, int longlen);
  44
  45 extern void __raw_readsb(unsigned int addr, void *data, int bytelen);
  46 extern void __raw_readsw(unsigned int addr, void *data, int wordlen);
  47 extern void __raw_readsl(unsigned int addr, void *data, int longlen);
  48
  49 #define __raw_writeb(v,a)               __arch_putb(v,a)
  50 #define __raw_writew(v,a)               __arch_putw(v,a)
  51 #define __raw_writel(v,a)               __arch_putl(v,a)
  52
  53 #define __raw_readb(a)                  __arch_getb(a)
  54 #define __raw_readw(a)                  __arch_getw(a)
  55 #define __raw_readl(a)                  __arch_getl(a)
  56
  57 /*
  58  * The compiler seems to be incapable of optimising constants
  59  * properly.  Spell it out to the compiler in some cases.
  60  * These are only valid for small values of "off" (< 1<<12)
  61  */
  62 #define __raw_base_writeb(val,base,off) __arch_base_putb(val,base,off)
  63 #define __raw_base_writew(val,base,off) __arch_base_putw(val,base,off)
  64 #define __raw_base_writel(val,base,off) __arch_base_putl(val,base,off)
  65
  66 #define __raw_base_readb(base,off)      __arch_base_getb(base,off)
  67 #define __raw_base_readw(base,off)      __arch_base_getw(base,off)
  68 #define __raw_base_readl(base,off)      __arch_base_getl(base,off)
  69
  70 /*
  71  * Now, pick up the machine-defined IO definitions
  72  */
  73 #if 0   /* XXX###XXX */
  74 #include <asm/arch/io.h>
  75 #endif  /* XXX###XXX */
  76
  77 /*
  78  *  IO port access primitives
  79  *  -------------------------
  80  *
  81  * The SH doesn't have special IO access instructions; all IO is memory
  82  * mapped.  Note that these are defined to perform little endian accesses
  83  * only.  Their primary purpose is to access PCI and ISA peripherals.
  84  *
  85  * The machine specific io.h include defines __io to translate an "IO"
  86  * address to a memory address.
  87  *
  88  * Note that we prevent GCC re-ordering or caching values in expressions
  89  * by introducing sequence points into the in*() definitions.  Note that
  90  * __raw_* do not guarantee this behaviour.
  91  *
  92  * The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space.
  93  */
  94 #define outb(v,p)               __raw_writeb(v, p)
  95 #define outw(v,p)               __raw_writew(cpu_to_le16(v),p)
  96 #define outl(v,p)               __raw_writel(cpu_to_le32(v),p)
  97
  98 #define inb(p)  ({ unsigned int __v = __raw_readb(p); __v; })
  99 #define inw(p)  ({ unsigned int __v = __le16_to_cpu(__raw_readw(p)); __v; })
 100 #define inl(p)  ({ unsigned int __v = __le32_to_cpu(__raw_readl(p)); __v; })
 101
 102 #define outsb(p,d,l)                    __raw_writesb(p,d,l)
 103 #define outsw(p,d,l)                    __raw_writesw(p,d,l)
 104 #define outsl(p,d,l)                    __raw_writesl(p,d,l)
 105
 106 #define insb(p,d,l)                     __raw_readsb(p,d,l)
 107 #define insw(p,d,l)                     __raw_readsw(p,d,l)
 108 #define insl(p,d,l)                     __raw_readsl(p,d,l)
 109
 110 #define outb_p(val,port)                outb((val),(port))
 111 #define outw_p(val,port)                outw((val),(port))
 112 #define outl_p(val,port)                outl((val),(port))
 113 #define inb_p(port)                     inb((port))
 114 #define inw_p(port)                     inw((port))
 115 #define inl_p(port)                     inl((port))
 116
 117 #define outsb_p(port,from,len)          outsb(port,from,len)
 118 #define outsw_p(port,from,len)          outsw(port,from,len)
 119 #define outsl_p(port,from,len)          outsl(port,from,len)
 120 #define insb_p(port,to,len)             insb(port,to,len)
 121 #define insw_p(port,to,len)             insw(port,to,len)
 122 #define insl_p(port,to,len)             insl(port,to,len)
 123
 124 /*
 125  * ioremap and friends.
 126  *
 127  * ioremap takes a PCI memory address, as specified in
 128  * linux/Documentation/IO-mapping.txt.  If you want a
 129  * physical address, use __ioremap instead.
 130  */
 131 extern void * __ioremap(unsigned long offset, size_t size, unsigned long flags);
 132 extern void __iounmap(void *addr);
 133
 134 /*
 135  * Generic ioremap support.
 136  *
 137  * Define:
 138  *  iomem_valid_addr(off,size)
 139  *  iomem_to_phys(off)
 140  */
 141 #ifdef iomem_valid_addr
 142 #define __arch_ioremap(off,sz,nocache)                          \
 143  ({                                                             \
 144         unsigned long _off = (off), _size = (sz);               \
 145         void *_ret = (void *)0;                                 \
 146         if (iomem_valid_addr(_off, _size))                      \
 147                 _ret = __ioremap(iomem_to_phys(_off),_size,0);  \
 148         _ret;                                                   \
 149  })
 150
 151 #define __arch_iounmap __iounmap
 152 #endif
 153
 154 #define ioremap(off,sz)                 __arch_ioremap((off),(sz),0)
 155 #define ioremap_nocache(off,sz)         __arch_ioremap((off),(sz),1)
 156 #define iounmap(_addr)                  __arch_iounmap(_addr)
 157
 158 /*
 159  * DMA-consistent mapping functions.  These allocate/free a region of
 160  * uncached, unwrite-buffered mapped memory space for use with DMA
 161  * devices.  This is the "generic" version.  The PCI specific version
 162  * is in pci.h
 163  */
 164 extern void *consistent_alloc(int gfp, size_t size, dma_addr_t *handle);
 165 extern void consistent_free(void *vaddr, size_t size, dma_addr_t handle);
 166 extern void consistent_sync(void *vaddr, size_t size, int rw);
 167
 168 /*
 169  * String version of IO memory access ops:
 170  */
 171 extern void _memcpy_fromio(void *, unsigned long, size_t);
 172 extern void _memcpy_toio(unsigned long, const void *, size_t);
 173 extern void _memset_io(unsigned long, int, size_t);
 174
 175 /*
 176  * If this architecture has PCI memory IO, then define the read/write
 177  * macros.  These should only be used with the cookie passed from
 178  * ioremap.
 179  */
 180 #ifdef __mem_pci
 181
 182 #define readb(c) ({ unsigned int __v = __raw_readb(__mem_pci(c)); __v; })
 183 #define readw(c) ({ unsigned int __v = le16_to_cpu(__raw_readw(__mem_pci(c))); __v; })
 184 #define readl(c) ({ unsigned int __v = le32_to_cpu(__raw_readl(__mem_pci(c))); __v; })
 185
 186 #define writeb(v,c)             __raw_writeb(v,__mem_pci(c))
 187 #define writew(v,c)             __raw_writew(cpu_to_le16(v),__mem_pci(c))
 188 #define writel(v,c)             __raw_writel(cpu_to_le32(v),__mem_pci(c))
 189
 190 #define memset_io(c,v,l)                _memset_io(__mem_pci(c),(v),(l))
 191 #define memcpy_fromio(a,c,l)            _memcpy_fromio((a),__mem_pci(c),(l))
 192 #define memcpy_toio(c,a,l)              _memcpy_toio(__mem_pci(c),(a),(l))
 193
 194 #define eth_io_copy_and_sum(s,c,l,b) \
 195                                 eth_copy_and_sum((s),__mem_pci(c),(l),(b))
 196
 197 static inline int
 198 check_signature(unsigned long io_addr, const unsigned char *signature,
 199                 int length)
 200 {
 201         int retval = 0;
 202         do {
 203                 if (readb(io_addr) != *signature)
 204                         goto out;
 205                 io_addr++;
 206                 signature++;
 207                 length--;
 208         } while (length);
 209         retval = 1;
 210 out:
 211         return retval;
 212 }
 213
 214 #elif !defined(readb)
 215
 216 #define readb(addr)     __raw_readb(addr)
 217 #define readw(addr)     __raw_readw(addr)
 218 #define readl(addr)     __raw_readl(addr)
 219 #define writeb(v,addr)  __raw_writeb(v, addr)
 220 #define writew(v,addr)  __raw_writew(v, addr)
 221 #define writel(v,addr)  __raw_writel(v, addr)
 222
 223 #define check_signature(io,sig,len)     (0)
 224
 225 #endif  /* __mem_pci */
 226
 227 static inline void sync(void)
 228 {
 229 }
 230
 231 /*
 232  * Given a physical address and a length, return a virtual address
 233  * that can be used to access the memory range with the caching
 234  * properties specified by "flags".
 235  */
 236 typedef unsigned long phys_addr_t;
 237
 238 #define MAP_NOCACHE     (0)
 239 #define MAP_WRCOMBINE   (0)
 240 #define MAP_WRBACK      (0)
 241 #define MAP_WRTHROUGH   (0)
 242
 243 static inline void *
 244 map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
 245 {
 246         return (void *)paddr;
 247 }
 248
 249 /*
 250  * Take down a mapping set up by map_physmem().
 251  */
 252 static inline void unmap_physmem(void *vaddr, unsigned long flags)
 253 {
 254
 255 }
 256
 257 #endif  /* __KERNEL__ */
 258 #endif  /* __ASM_SH_IO_H */