arch/arm/mach-s3c64xx/include/mach/pwm-clock.h

   1 /* linux/arch/arm/mach-s3c6400/include/mach/pwm-clock.h
   2  *
   3  * Copyright 2008 Openmoko, Inc.
   4  * Copyright 2008 Simtec Electronics
   5  *      Ben Dooks <ben@simtec.co.uk>
   6  *      http://armlinux.simtec.co.uk/
   7  *
   8  * S3C64xx - pwm clock and timer support
   9  */
  10
  11 /**
  12  * pwm_cfg_src_is_tclk() - return whether the given mux config is a tclk
  13  * @tcfg: The timer TCFG1 register bits shifted down to 0.
  14  *
  15  * Return true if the given configuration from TCFG1 is a TCLK instead
  16  * any of the TDIV clocks.
  17  */
  18 static inline int pwm_cfg_src_is_tclk(unsigned long tcfg)
  19 {
  20         return tcfg >= S3C64XX_TCFG1_MUX_TCLK;
  21 }
  22
  23 /**
  24  * tcfg_to_divisor() - convert tcfg1 setting to a divisor
  25  * @tcfg1: The tcfg1 setting, shifted down.
  26  *
  27  * Get the divisor value for the given tcfg1 setting. We assume the
  28  * caller has already checked to see if this is not a TCLK source.
  29  */
  30 static inline unsigned long tcfg_to_divisor(unsigned long tcfg1)
  31 {
  32         return 1 << tcfg1;
  33 }
  34
  35 /**
  36  * pwm_tdiv_has_div1() - does the tdiv setting have a /1
  37  *
  38  * Return true if we have a /1 in the tdiv setting.
  39  */
  40 static inline unsigned int pwm_tdiv_has_div1(void)
  41 {
  42         return 1;
  43 }
  44
  45 /**
  46  * pwm_tdiv_div_bits() - calculate TCFG1 divisor value.
  47  * @div: The divisor to calculate the bit information for.
  48  *
  49  * Turn a divisor into the necessary bit field for TCFG1.
  50  */
  51 static inline unsigned long pwm_tdiv_div_bits(unsigned int div)
  52 {
  53         return ilog2(div);
  54 }
  55
  56 #define S3C_TCFG1_MUX_TCLK S3C64XX_TCFG1_MUX_TCLK