kernel/drivers/clk/st/clkgen.h

   1 /************************************************************************
   2 File  : Clock H/w specific Information
   3
   4 Author: Pankaj Dev <pankaj.dev@st.com>
   5
   6 Copyright (C) 2014 STMicroelectronics
   7 ************************************************************************/
   8
   9 #ifndef __CLKGEN_INFO_H
  10 #define __CLKGEN_INFO_H
  11
  12 extern spinlock_t clkgen_a9_lock;
  13
  14 struct clkgen_field {
  15         unsigned int offset;
  16         unsigned int mask;
  17         unsigned int shift;
  18 };
  19
  20 static inline unsigned long clkgen_read(void __iomem    *base,
  21                                           struct clkgen_field *field)
  22 {
  23         return (readl(base + field->offset) >> field->shift) & field->mask;
  24 }
  25
  26
  27 static inline void clkgen_write(void __iomem *base, struct clkgen_field *field,
  28                                   unsigned long val)
  29 {
  30         writel((readl(base + field->offset) &
  31                ~(field->mask << field->shift)) | (val << field->shift),
  32                base + field->offset);
  33
  34         return;
  35 }
  36
  37 #define CLKGEN_FIELD(_offset, _mask, _shift) {          \
  38                                 .offset = _offset,      \
  39                                 .mask   = _mask,        \
  40                                 .shift  = _shift,       \
  41                                 }
  42
  43 #define CLKGEN_READ(pll, field) clkgen_read(pll->regs_base, \
  44                 &pll->data->field)
  45
  46 #define CLKGEN_WRITE(pll, field, val) clkgen_write(pll->regs_base, \
  47                 &pll->data->field, val)
  48
  49 #endif /*__CLKGEN_INFO_H*/
  50