include/asm-m68knommu/io.h

   1 #ifndef _M68KNOMMU_IO_H
   2 #define _M68KNOMMU_IO_H
   3
   4 #ifdef __KERNEL__
   5
   6 #include <linux/config.h>
   7
   8 /*
   9  * These are for ISA/PCI shared memory _only_ and should never be used
  10  * on any other type of memory, including Zorro memory. They are meant to
  11  * access the bus in the bus byte order which is little-endian!.
  12  *
  13  * readX/writeX() are used to access memory mapped devices. On some
  14  * architectures the memory mapped IO stuff needs to be accessed
  15  * differently. On the m68k architecture, we just read/write the
  16  * memory location directly.
  17  */
  18 /* ++roman: The assignments to temp. vars avoid that gcc sometimes generates
  19  * two accesses to memory, which may be undesireable for some devices.
  20  */
  21
  22 /*
  23  * swap functions are sometimes needed to interface little-endian hardware
  24  */
  25 static inline unsigned short _swapw(volatile unsigned short v)
  26 {
  27     return ((v << 8) | (v >> 8));
  28 }
  29
  30 static inline unsigned int _swapl(volatile unsigned long v)
  31 {
  32     return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
  33 }
  34
  35 #define readb(addr) \
  36     ({ unsigned char __v = (*(volatile unsigned char *) (addr)); __v; })
  37 #define readw(addr) \
  38     ({ unsigned short __v = (*(volatile unsigned short *) (addr)); __v; })
  39 #define readl(addr) \
  40     ({ unsigned int __v = (*(volatile unsigned int *) (addr)); __v; })
  41
  42 #define writeb(b,addr) (void)((*(volatile unsigned char *) (addr)) = (b))
  43 #define writew(b,addr) (void)((*(volatile unsigned short *) (addr)) = (b))
  44 #define writel(b,addr) (void)((*(volatile unsigned int *) (addr)) = (b))
  45
  46 #define __raw_readb readb
  47 #define __raw_readw readw
  48 #define __raw_readl readl
  49 #define __raw_writeb writeb
  50 #define __raw_writew writew
  51 #define __raw_writel writel
  52
  53 static inline void io_outsb(unsigned int addr, void *buf, int len)
  54 {
  55         volatile unsigned char *ap = (volatile unsigned char *) addr;
  56         unsigned char *bp = (unsigned char *) buf;
  57         while (len--)
  58                 *ap = *bp++;
  59 }
  60
  61 static inline void io_outsw(unsigned int addr, void *buf, int len)
  62 {
  63         volatile unsigned short *ap = (volatile unsigned short *) addr;
  64         unsigned short *bp = (unsigned short *) buf;
  65         while (len--)
  66                 *ap = _swapw(*bp++);
  67 }
  68
  69 static inline void io_outsl(unsigned int addr, void *buf, int len)
  70 {
  71         volatile unsigned int *ap = (volatile unsigned int *) addr;
  72         unsigned int *bp = (unsigned int *) buf;
  73         while (len--)
  74                 *ap = _swapl(*bp++);
  75 }
  76
  77 static inline void io_insb(unsigned int addr, void *buf, int len)
  78 {
  79         volatile unsigned char *ap = (volatile unsigned char *) addr;
  80         unsigned char *bp = (unsigned char *) buf;
  81         while (len--)
  82                 *bp++ = *ap;
  83 }
  84
  85 static inline void io_insw(unsigned int addr, void *buf, int len)
  86 {
  87         volatile unsigned short *ap = (volatile unsigned short *) addr;
  88         unsigned short *bp = (unsigned short *) buf;
  89         while (len--)
  90                 *bp++ = _swapw(*ap);
  91 }
  92
  93 static inline void io_insl(unsigned int addr, void *buf, int len)
  94 {
  95         volatile unsigned int *ap = (volatile unsigned int *) addr;
  96         unsigned int *bp = (unsigned int *) buf;
  97         while (len--)
  98                 *bp++ = _swapl(*ap);
  99 }
 100
 101 /*
 102  *      make the short names macros so specific devices
 103  *      can override them as required
 104  */
 105
 106 #define memset_io(a,b,c)        memset((void *)(a),(b),(c))
 107 #define memcpy_fromio(a,b,c)    memcpy((a),(void *)(b),(c))
 108 #define memcpy_toio(a,b,c)      memcpy((void *)(a),(b),(c))
 109
 110 #define inb(addr)    readb(addr)
 111 #define inw(addr)    readw(addr)
 112 #define inl(addr)    readl(addr)
 113 #define outb(x,addr) ((void) writeb(x,addr))
 114 #define outw(x,addr) ((void) writew(x,addr))
 115 #define outl(x,addr) ((void) writel(x,addr))
 116
 117 #define inb_p(addr)    inb(addr)
 118 #define inw_p(addr)    inw(addr)
 119 #define inl_p(addr)    inl(addr)
 120 #define outb_p(x,addr) outb(x,addr)
 121 #define outw_p(x,addr) outw(x,addr)
 122 #define outl_p(x,addr) outl(x,addr)
 123
 124 #define outsb(a,b,l) io_outsb(a,b,l)
 125 #define outsw(a,b,l) io_outsw(a,b,l)
 126 #define outsl(a,b,l) io_outsl(a,b,l)
 127
 128 #define insb(a,b,l) io_insb(a,b,l)
 129 #define insw(a,b,l) io_insw(a,b,l)
 130 #define insl(a,b,l) io_insl(a,b,l)
 131
 132 #define IO_SPACE_LIMIT 0xffff
 133
 134
 135 /* Values for nocacheflag and cmode */
 136 #define IOMAP_FULL_CACHING              0
 137 #define IOMAP_NOCACHE_SER               1
 138 #define IOMAP_NOCACHE_NONSER            2
 139 #define IOMAP_WRITETHROUGH              3
 140
 141 extern void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag);
 142 extern void __iounmap(void *addr, unsigned long size);
 143
 144 extern inline void *ioremap(unsigned long physaddr, unsigned long size)
 145 {
 146         return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
 147 }
 148 extern inline void *ioremap_nocache(unsigned long physaddr, unsigned long size)
 149 {
 150         return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
 151 }
 152 extern inline void *ioremap_writethrough(unsigned long physaddr, unsigned long size)
 153 {
 154         return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
 155 }
 156 extern inline void *ioremap_fullcache(unsigned long physaddr, unsigned long size)
 157 {
 158         return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
 159 }
 160
 161 extern void iounmap(void *addr);
 162
 163 /* Nothing to do */
 164
 165 #define dma_cache_inv(_start,_size)             do { } while (0)
 166 #define dma_cache_wback(_start,_size)           do { } while (0)
 167 #define dma_cache_wback_inv(_start,_size)       do { } while (0)
 168
 169 /* Pages to physical address... */
 170 #define page_to_phys(page)      ((page - mem_map) << PAGE_SHIFT)
 171 #define page_to_bus(page)       ((page - mem_map) << PAGE_SHIFT)
 172
 173 /*
 174  * Macros used for converting between virtual and physical mappings.
 175  */
 176 #define mm_ptov(vaddr)          ((void *) (vaddr))
 177 #define mm_vtop(vaddr)          ((unsigned long) (vaddr))
 178 #define phys_to_virt(vaddr)     ((void *) (vaddr))
 179 #define virt_to_phys(vaddr)     ((unsigned long) (vaddr))
 180
 181 #define virt_to_bus virt_to_phys
 182 #define bus_to_virt phys_to_virt
 183
 184 #endif /* __KERNEL__ */
 185
 186 #endif /* _M68KNOMMU_IO_H */