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 readb_relaxed(addr) readb(addr)
  43 #define readw_relaxed(addr) readw(addr)
  44 #define readl_relaxed(addr) readl(addr)
  45
  46 #define writeb(b,addr) (void)((*(volatile unsigned char *) (addr)) = (b))
  47 #define writew(b,addr) (void)((*(volatile unsigned short *) (addr)) = (b))
  48 #define writel(b,addr) (void)((*(volatile unsigned int *) (addr)) = (b))
  49
  50 #define __raw_readb readb
  51 #define __raw_readw readw
  52 #define __raw_readl readl
  53 #define __raw_writeb writeb
  54 #define __raw_writew writew
  55 #define __raw_writel writel
  56
  57 static inline void io_outsb(unsigned int addr, void *buf, int len)
  58 {
  59         volatile unsigned char *ap = (volatile unsigned char *) addr;
  60         unsigned char *bp = (unsigned char *) buf;
  61         while (len--)
  62                 *ap = *bp++;
  63 }
  64
  65 static inline void io_outsw(unsigned int addr, void *buf, int len)
  66 {
  67         volatile unsigned short *ap = (volatile unsigned short *) addr;
  68         unsigned short *bp = (unsigned short *) buf;
  69         while (len--)
  70                 *ap = _swapw(*bp++);
  71 }
  72
  73 static inline void io_outsl(unsigned int addr, void *buf, int len)
  74 {
  75         volatile unsigned int *ap = (volatile unsigned int *) addr;
  76         unsigned int *bp = (unsigned int *) buf;
  77         while (len--)
  78                 *ap = _swapl(*bp++);
  79 }
  80
  81 static inline void io_insb(unsigned int addr, void *buf, int len)
  82 {
  83         volatile unsigned char *ap = (volatile unsigned char *) addr;
  84         unsigned char *bp = (unsigned char *) buf;
  85         while (len--)
  86                 *bp++ = *ap;
  87 }
  88
  89 static inline void io_insw(unsigned int addr, void *buf, int len)
  90 {
  91         volatile unsigned short *ap = (volatile unsigned short *) addr;
  92         unsigned short *bp = (unsigned short *) buf;
  93         while (len--)
  94                 *bp++ = _swapw(*ap);
  95 }
  96
  97 static inline void io_insl(unsigned int addr, void *buf, int len)
  98 {
  99         volatile unsigned int *ap = (volatile unsigned int *) addr;
 100         unsigned int *bp = (unsigned int *) buf;
 101         while (len--)
 102                 *bp++ = _swapl(*ap);
 103 }
 104
 105 #define mmiowb()
 106
 107 /*
 108  *      make the short names macros so specific devices
 109  *      can override them as required
 110  */
 111
 112 #define memset_io(a,b,c)        memset((void *)(a),(b),(c))
 113 #define memcpy_fromio(a,b,c)    memcpy((a),(void *)(b),(c))
 114 #define memcpy_toio(a,b,c)      memcpy((void *)(a),(b),(c))
 115
 116 #define inb(addr)    readb(addr)
 117 #define inw(addr)    readw(addr)
 118 #define inl(addr)    readl(addr)
 119 #define outb(x,addr) ((void) writeb(x,addr))
 120 #define outw(x,addr) ((void) writew(x,addr))
 121 #define outl(x,addr) ((void) writel(x,addr))
 122
 123 #define inb_p(addr)    inb(addr)
 124 #define inw_p(addr)    inw(addr)
 125 #define inl_p(addr)    inl(addr)
 126 #define outb_p(x,addr) outb(x,addr)
 127 #define outw_p(x,addr) outw(x,addr)
 128 #define outl_p(x,addr) outl(x,addr)
 129
 130 #define outsb(a,b,l) io_outsb(a,b,l)
 131 #define outsw(a,b,l) io_outsw(a,b,l)
 132 #define outsl(a,b,l) io_outsl(a,b,l)
 133
 134 #define insb(a,b,l) io_insb(a,b,l)
 135 #define insw(a,b,l) io_insw(a,b,l)
 136 #define insl(a,b,l) io_insl(a,b,l)
 137
 138 #define IO_SPACE_LIMIT 0xffff
 139
 140
 141 /* Values for nocacheflag and cmode */
 142 #define IOMAP_FULL_CACHING              0
 143 #define IOMAP_NOCACHE_SER               1
 144 #define IOMAP_NOCACHE_NONSER            2
 145 #define IOMAP_WRITETHROUGH              3
 146
 147 extern void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag);
 148 extern void __iounmap(void *addr, unsigned long size);
 149
 150 extern inline void *ioremap(unsigned long physaddr, unsigned long size)
 151 {
 152         return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
 153 }
 154 extern inline void *ioremap_nocache(unsigned long physaddr, unsigned long size)
 155 {
 156         return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
 157 }
 158 extern inline void *ioremap_writethrough(unsigned long physaddr, unsigned long size)
 159 {
 160         return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
 161 }
 162 extern inline void *ioremap_fullcache(unsigned long physaddr, unsigned long size)
 163 {
 164         return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
 165 }
 166
 167 extern void iounmap(void *addr);
 168
 169 /* Nothing to do */
 170
 171 #define dma_cache_inv(_start,_size)             do { } while (0)
 172 #define dma_cache_wback(_start,_size)           do { } while (0)
 173 #define dma_cache_wback_inv(_start,_size)       do { } while (0)
 174
 175 /* Pages to physical address... */
 176 #define page_to_phys(page)      ((page - mem_map) << PAGE_SHIFT)
 177 #define page_to_bus(page)       ((page - mem_map) << PAGE_SHIFT)
 178
 179 /*
 180  * Macros used for converting between virtual and physical mappings.
 181  */
 182 #define mm_ptov(vaddr)          ((void *) (vaddr))
 183 #define mm_vtop(vaddr)          ((unsigned long) (vaddr))
 184 #define phys_to_virt(vaddr)     ((void *) (vaddr))
 185 #define virt_to_phys(vaddr)     ((unsigned long) (vaddr))
 186
 187 #define virt_to_bus virt_to_phys
 188 #define bus_to_virt phys_to_virt
 189
 190 /*
 191  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 192  * access
 193  */
 194 #define xlate_dev_mem_ptr(p)    __va(p)
 195
 196 /*
 197  * Convert a virtual cached pointer to an uncached pointer
 198  */
 199 #define xlate_dev_kmem_ptr(p)   p
 200
 201 #endif /* __KERNEL__ */
 202
 203 #endif /* _M68KNOMMU_IO_H */