include/asm-m68knommu/io.h

   1 #ifndef _M68KNOMMU_IO_H
   2 #define _M68KNOMMU_IO_H
   3
   4 #ifdef __KERNEL__
   5
   6
   7 /*
   8  * These are for ISA/PCI shared memory _only_ and should never be used
   9  * on any other type of memory, including Zorro memory. They are meant to
  10  * access the bus in the bus byte order which is little-endian!.
  11  *
  12  * readX/writeX() are used to access memory mapped devices. On some
  13  * architectures the memory mapped IO stuff needs to be accessed
  14  * differently. On the m68k architecture, we just read/write the
  15  * memory location directly.
  16  */
  17 /* ++roman: The assignments to temp. vars avoid that gcc sometimes generates
  18  * two accesses to memory, which may be undesireable for some devices.
  19  */
  20
  21 /*
  22  * swap functions are sometimes needed to interface little-endian hardware
  23  */
  24 static inline unsigned short _swapw(volatile unsigned short v)
  25 {
  26     return ((v << 8) | (v >> 8));
  27 }
  28
  29 static inline unsigned int _swapl(volatile unsigned long v)
  30 {
  31     return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
  32 }
  33
  34 #define readb(addr) \
  35     ({ unsigned char __v = (*(volatile unsigned char *) (addr)); __v; })
  36 #define readw(addr) \
  37     ({ unsigned short __v = (*(volatile unsigned short *) (addr)); __v; })
  38 #define readl(addr) \
  39     ({ unsigned int __v = (*(volatile unsigned int *) (addr)); __v; })
  40
  41 #define readb_relaxed(addr) readb(addr)
  42 #define readw_relaxed(addr) readw(addr)
  43 #define readl_relaxed(addr) readl(addr)
  44
  45 #define writeb(b,addr) (void)((*(volatile unsigned char *) (addr)) = (b))
  46 #define writew(b,addr) (void)((*(volatile unsigned short *) (addr)) = (b))
  47 #define writel(b,addr) (void)((*(volatile unsigned int *) (addr)) = (b))
  48
  49 #define __raw_readb readb
  50 #define __raw_readw readw
  51 #define __raw_readl readl
  52 #define __raw_writeb writeb
  53 #define __raw_writew writew
  54 #define __raw_writel writel
  55
  56 static inline void io_outsb(unsigned int addr, void *buf, int len)
  57 {
  58         volatile unsigned char *ap = (volatile unsigned char *) addr;
  59         unsigned char *bp = (unsigned char *) buf;
  60         while (len--)
  61                 *ap = *bp++;
  62 }
  63
  64 static inline void io_outsw(unsigned int addr, void *buf, int len)
  65 {
  66         volatile unsigned short *ap = (volatile unsigned short *) addr;
  67         unsigned short *bp = (unsigned short *) buf;
  68         while (len--)
  69                 *ap = _swapw(*bp++);
  70 }
  71
  72 static inline void io_outsl(unsigned int addr, void *buf, int len)
  73 {
  74         volatile unsigned int *ap = (volatile unsigned int *) addr;
  75         unsigned int *bp = (unsigned int *) buf;
  76         while (len--)
  77                 *ap = _swapl(*bp++);
  78 }
  79
  80 static inline void io_insb(unsigned int addr, void *buf, int len)
  81 {
  82         volatile unsigned char *ap = (volatile unsigned char *) addr;
  83         unsigned char *bp = (unsigned char *) buf;
  84         while (len--)
  85                 *bp++ = *ap;
  86 }
  87
  88 static inline void io_insw(unsigned int addr, void *buf, int len)
  89 {
  90         volatile unsigned short *ap = (volatile unsigned short *) addr;
  91         unsigned short *bp = (unsigned short *) buf;
  92         while (len--)
  93                 *bp++ = _swapw(*ap);
  94 }
  95
  96 static inline void io_insl(unsigned int addr, void *buf, int len)
  97 {
  98         volatile unsigned int *ap = (volatile unsigned int *) addr;
  99         unsigned int *bp = (unsigned int *) buf;
 100         while (len--)
 101                 *bp++ = _swapl(*ap);
 102 }
 103
 104 #define mmiowb()
 105
 106 /*
 107  *      make the short names macros so specific devices
 108  *      can override them as required
 109  */
 110
 111 #define memset_io(a,b,c)        memset((void *)(a),(b),(c))
 112 #define memcpy_fromio(a,b,c)    memcpy((a),(void *)(b),(c))
 113 #define memcpy_toio(a,b,c)      memcpy((void *)(a),(b),(c))
 114
 115 #define inb(addr)    readb(addr)
 116 #define inw(addr)    readw(addr)
 117 #define inl(addr)    readl(addr)
 118 #define outb(x,addr) ((void) writeb(x,addr))
 119 #define outw(x,addr) ((void) writew(x,addr))
 120 #define outl(x,addr) ((void) writel(x,addr))
 121
 122 #define inb_p(addr)    inb(addr)
 123 #define inw_p(addr)    inw(addr)
 124 #define inl_p(addr)    inl(addr)
 125 #define outb_p(x,addr) outb(x,addr)
 126 #define outw_p(x,addr) outw(x,addr)
 127 #define outl_p(x,addr) outl(x,addr)
 128
 129 #define outsb(a,b,l) io_outsb(a,b,l)
 130 #define outsw(a,b,l) io_outsw(a,b,l)
 131 #define outsl(a,b,l) io_outsl(a,b,l)
 132
 133 #define insb(a,b,l) io_insb(a,b,l)
 134 #define insw(a,b,l) io_insw(a,b,l)
 135 #define insl(a,b,l) io_insl(a,b,l)
 136
 137 #define IO_SPACE_LIMIT 0xffff
 138
 139
 140 /* Values for nocacheflag and cmode */
 141 #define IOMAP_FULL_CACHING              0
 142 #define IOMAP_NOCACHE_SER               1
 143 #define IOMAP_NOCACHE_NONSER            2
 144 #define IOMAP_WRITETHROUGH              3
 145
 146 extern void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag);
 147 extern void __iounmap(void *addr, unsigned long size);
 148
 149 static inline void *ioremap(unsigned long physaddr, unsigned long size)
 150 {
 151         return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
 152 }
 153 static inline void *ioremap_nocache(unsigned long physaddr, unsigned long size)
 154 {
 155         return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
 156 }
 157 static inline void *ioremap_writethrough(unsigned long physaddr, unsigned long size)
 158 {
 159         return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
 160 }
 161 static inline void *ioremap_fullcache(unsigned long physaddr, unsigned long size)
 162 {
 163         return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
 164 }
 165
 166 extern void iounmap(void *addr);
 167
 168 /* Pages to physical address... */
 169 #define page_to_phys(page)      ((page - mem_map) << PAGE_SHIFT)
 170 #define page_to_bus(page)       ((page - mem_map) << PAGE_SHIFT)
 171
 172 /*
 173  * Macros used for converting between virtual and physical mappings.
 174  */
 175 #define phys_to_virt(vaddr)     ((void *) (vaddr))
 176 #define virt_to_phys(vaddr)     ((unsigned long) (vaddr))
 177
 178 #define virt_to_bus virt_to_phys
 179 #define bus_to_virt phys_to_virt
 180
 181 /*
 182  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 183  * access
 184  */
 185 #define xlate_dev_mem_ptr(p)    __va(p)
 186
 187 /*
 188  * Convert a virtual cached pointer to an uncached pointer
 189  */
 190 #define xlate_dev_kmem_ptr(p)   p
 191
 192 #endif /* __KERNEL__ */
 193
 194 #endif /* _M68KNOMMU_IO_H */