release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-s5pv310/include/mach/pwm-clock.h

   1 /* linux/arch/arm/mach-s5pv310/include/mach/pwm-clock.h
   2  *
   3  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com/
   5  *
   6  * Copyright 2008 Openmoko, Inc.
   7  * Copyright 2008 Simtec Electronics
   8  *      Ben Dooks <ben@simtec.co.uk>
   9  *      http://armlinux.simtec.co.uk/
  10  *
  11  * Based on arch/arm/mach-s3c64xx/include/mach/pwm-clock.h
  12  *
  13  * S5PV310 - pwm clock and timer support
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License version 2 as
  17  * published by the Free Software Foundation.
  18 */
  19
  20 #ifndef __ASM_ARCH_PWMCLK_H
  21 #define __ASM_ARCH_PWMCLK_H __FILE__
  22
  23 /**
  24  * pwm_cfg_src_is_tclk() - return whether the given mux config is a tclk
  25  * @tcfg: The timer TCFG1 register bits shifted down to 0.
  26  *
  27  * Return true if the given configuration from TCFG1 is a TCLK instead
  28  * any of the TDIV clocks.
  29  */
  30 static inline int pwm_cfg_src_is_tclk(unsigned long tcfg)
  31 {
  32         return tcfg == S3C64XX_TCFG1_MUX_TCLK;
  33 }
  34
  35 /**
  36  * tcfg_to_divisor() - convert tcfg1 setting to a divisor
  37  * @tcfg1: The tcfg1 setting, shifted down.
  38  *
  39  * Get the divisor value for the given tcfg1 setting. We assume the
  40  * caller has already checked to see if this is not a TCLK source.
  41  */
  42 static inline unsigned long tcfg_to_divisor(unsigned long tcfg1)
  43 {
  44         return 1 << tcfg1;
  45 }
  46
  47 /**
  48  * pwm_tdiv_has_div1() - does the tdiv setting have a /1
  49  *
  50  * Return true if we have a /1 in the tdiv setting.
  51  */
  52 static inline unsigned int pwm_tdiv_has_div1(void)
  53 {
  54         return 1;
  55 }
  56
  57 /**
  58  * pwm_tdiv_div_bits() - calculate TCFG1 divisor value.
  59  * @div: The divisor to calculate the bit information for.
  60  *
  61  * Turn a divisor into the necessary bit field for TCFG1.
  62  */
  63 static inline unsigned long pwm_tdiv_div_bits(unsigned int div)
  64 {
  65         return ilog2(div);
  66 }
  67
  68 #define S3C_TCFG1_MUX_TCLK S3C64XX_TCFG1_MUX_TCLK
  69
  70 #endif /* __ASM_ARCH_PWMCLK_H */