arch/arm/plat-s3c24xx/include/mach/pwm-clock.h

   1 /* linux/arch/arm/plat-s3c24xx/include/mach/pwm-clock.h
   2  *
   3  * Copyright 2008 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *      http://armlinux.simtec.co.uk/
   6  *
   7  * S3C24xx - pwm clock and timer support
   8  */
   9
  10 /**
  11  * pwm_cfg_src_is_tclk() - return whether the given mux config is a tclk
  12  * @cfg: The timer TCFG1 register bits shifted down to 0.
  13  *
  14  * Return true if the given configuration from TCFG1 is a TCLK instead
  15  * any of the TDIV clocks.
  16  */
  17 static inline int pwm_cfg_src_is_tclk(unsigned long tcfg)
  18 {
  19         return tcfg == S3C2410_TCFG1_MUX_TCLK;
  20 }
  21
  22 /**
  23  * tcfg_to_divisor() - convert tcfg1 setting to a divisor
  24  * @tcfg1: The tcfg1 setting, shifted down.
  25  *
  26  * Get the divisor value for the given tcfg1 setting. We assume the
  27  * caller has already checked to see if this is not a TCLK source.
  28  */
  29 static inline unsigned long tcfg_to_divisor(unsigned long tcfg1)
  30 {
  31         return 1 << (1 + tcfg1);
  32 }
  33
  34 /**
  35  * pwm_tdiv_has_div1() - does the tdiv setting have a /1
  36  *
  37  * Return true if we have a /1 in the tdiv setting.
  38  */
  39 static inline unsigned int pwm_tdiv_has_div1(void)
  40 {
  41         return 0;
  42 }
  43
  44 /**
  45  * pwm_tdiv_div_bits() - calculate TCFG1 divisor value.
  46  * @div: The divisor to calculate the bit information for.
  47  *
  48  * Turn a divisor into the necessary bit field for TCFG1.
  49  */
  50 static inline unsigned long pwm_tdiv_div_bits(unsigned int div)
  51 {
  52         return ilog2(div) - 1;
  53 }
  54
  55 #define S3C_TCFG1_MUX_TCLK S3C2410_TCFG1_MUX_TCLK