include/io.h

   1 /* This code is directly from Microwatt and is Copyright and Licensed
   2    under the same terms as Microwatt source code.
   3    https://github.com/antonblanchard/microwatt/blob/master/include/io.h
   4 */
   5
   6 #ifndef __IO_H
   7 #define __IO_H
   8
   9 static inline uint8_t readb(unsigned long addr)
  10 {
  11         uint8_t val;
  12         __asm__ volatile("sync; lbzcix %0,0,%1" : "=r" (val) : "r" (addr) : "memory");
  13         return val;
  14 }
  15
  16 static inline uint16_t readw(unsigned long addr)
  17 {
  18         uint16_t val;
  19         __asm__ volatile("sync; lhzcix %0,0,%1" : "=r" (val) : "r" (addr) : "memory");
  20         return val;
  21 }
  22
  23 static inline uint32_t readl(unsigned long addr)
  24 {
  25         uint32_t val;
  26         __asm__ volatile("sync; lwzcix %0,0,%1" : "=r" (val) : "r" (addr) : "memory");
  27         return val;
  28 }
  29
  30 static inline uint64_t readq(unsigned long addr)
  31 {
  32         uint64_t val;
  33         __asm__ volatile("sync; ldcix %0,0,%1" : "=r" (val) : "r" (addr) : "memory");
  34         return val;
  35 }
  36
  37 static inline void writeb(uint8_t val, unsigned long addr)
  38 {
  39         __asm__ volatile("sync; stbcix %0,0,%1" : : "r" (val), "r" (addr) : "memory");
  40 }
  41
  42 static inline void writew(uint16_t val, unsigned long addr)
  43 {
  44         __asm__ volatile("sync; sthcix %0,0,%1" : : "r" (val), "r" (addr) : "memory");
  45 }
  46
  47 static inline void writel(uint32_t val, unsigned long addr)
  48 {
  49         __asm__ volatile("sync; stwcix %0,0,%1" : : "r" (val), "r" (addr) : "memory");
  50 }
  51
  52 static inline void writeq(uint64_t val, unsigned long addr)
  53 {
  54         __asm__ volatile("sync; stdcix %0,0,%1" : : "r" (val), "r" (addr) : "memory");
  55 }
  56
  57 #endif /* __IO_H */
  58