drivers/devfreq/exynos/exynos_ppmu.c

   1 /*
   2  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   3  *              http://www.samsung.com/
   4  *
   5  * EXYNOS - PPMU support
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/types.h>
  14 #include <linux/io.h>
  15
  16 #include "exynos_ppmu.h"
  17
  18 void exynos_ppmu_reset(void __iomem *ppmu_base)
  19 {
  20         __raw_writel(PPMU_CYCLE_RESET | PPMU_COUNTER_RESET, ppmu_base);
  21         __raw_writel(PPMU_ENABLE_CYCLE  |
  22                      PPMU_ENABLE_COUNT0 |
  23                      PPMU_ENABLE_COUNT1 |
  24                      PPMU_ENABLE_COUNT2 |
  25                      PPMU_ENABLE_COUNT3,
  26                      ppmu_base + PPMU_CNTENS);
  27 }
  28
  29 void exynos_ppmu_setevent(void __iomem *ppmu_base, unsigned int ch,
  30                         unsigned int evt)
  31 {
  32         __raw_writel(evt, ppmu_base + PPMU_BEVTSEL(ch));
  33 }
  34
  35 void exynos_ppmu_start(void __iomem *ppmu_base)
  36 {
  37         __raw_writel(PPMU_ENABLE, ppmu_base);
  38 }
  39
  40 void exynos_ppmu_stop(void __iomem *ppmu_base)
  41 {
  42         __raw_writel(PPMU_DISABLE, ppmu_base);
  43 }
  44
  45 unsigned int exynos_ppmu_read(void __iomem *ppmu_base, unsigned int ch)
  46 {
  47         unsigned int total;
  48
  49         if (ch == PPMU_PMNCNT3)
  50                 total = ((__raw_readl(ppmu_base + PMCNT_OFFSET(ch)) << 8) |
  51                           __raw_readl(ppmu_base + PMCNT_OFFSET(ch + 1)));
  52         else
  53                 total = __raw_readl(ppmu_base + PMCNT_OFFSET(ch));
  54
  55         return total;
  56 }