arch/arm/plat-samsung/include/plat/pwm-clock.h

   1 /* linux/arch/arm/plat-samsung/include/plat/pwm-clock.h
   2  *
   3  * Copyright (c) 2010-2011 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  * SAMSUNG - pwm clock and timer support
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2 as
  15  * published by the Free Software Foundation.
  16 */
  17
  18 #ifndef __ASM_PLAT_PWM_CLOCK_H
  19 #define __ASM_PLAT_PWM_CLOCK_H __FILE__
  20
  21 /**
  22  * pwm_cfg_src_is_tclk() - return whether the given mux config is a tclk
  23  * @tcfg: The timer TCFG1 register bits shifted down to 0.
  24  *
  25  * Return true if the given configuration from TCFG1 is a TCLK instead
  26  * any of the TDIV clocks.
  27  */
  28 static inline int pwm_cfg_src_is_tclk(unsigned long tcfg)
  29 {
  30         if (soc_is_s3c24xx())
  31                 return tcfg == S3C2410_TCFG1_MUX_TCLK;
  32         else if (soc_is_s3c64xx() || soc_is_s5pc100())
  33                 return tcfg >= S3C64XX_TCFG1_MUX_TCLK;
  34         else if (soc_is_s5p6440() || soc_is_s5p6450())
  35                 return 0;
  36         else
  37                 return tcfg == S3C64XX_TCFG1_MUX_TCLK;
  38 }
  39
  40 /**
  41  * tcfg_to_divisor() - convert tcfg1 setting to a divisor
  42  * @tcfg1: The tcfg1 setting, shifted down.
  43  *
  44  * Get the divisor value for the given tcfg1 setting. We assume the
  45  * caller has already checked to see if this is not a TCLK source.
  46  */
  47 static inline unsigned long tcfg_to_divisor(unsigned long tcfg1)
  48 {
  49         if (soc_is_s3c24xx())
  50                 return 1 << (tcfg1 + 1);
  51         else
  52                 return 1 << tcfg1;
  53 }
  54
  55 /**
  56  * pwm_tdiv_has_div1() - does the tdiv setting have a /1
  57  *
  58  * Return true if we have a /1 in the tdiv setting.
  59  */
  60 static inline unsigned int pwm_tdiv_has_div1(void)
  61 {
  62         if (soc_is_s3c24xx())
  63                 return 0;
  64         else
  65                 return 1;
  66 }
  67
  68 /**
  69  * pwm_tdiv_div_bits() - calculate TCFG1 divisor value.
  70  * @div: The divisor to calculate the bit information for.
  71  *
  72  * Turn a divisor into the necessary bit field for TCFG1.
  73  */
  74 static inline unsigned long pwm_tdiv_div_bits(unsigned int div)
  75 {
  76         if (soc_is_s3c24xx())
  77                 return ilog2(div) - 1;
  78         else
  79                 return ilog2(div);
  80 }
  81 #endif /* __ASM_PLAT_PWM_CLOCK_H */