drivers/media/platform/s5p-mfc/s5p_mfc_pm.c

   1 /*
   2  * linux/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c
   3  *
   4  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
   5  *              http://www.samsung.com/
   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 as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12
  13 #include <linux/clk.h>
  14 #include <linux/err.h>
  15 #include <linux/platform_device.h>
  16 #ifdef CONFIG_PM_RUNTIME
  17 #include <linux/pm_runtime.h>
  18 #endif
  19 #include "s5p_mfc_common.h"
  20 #include "s5p_mfc_debug.h"
  21 #include "s5p_mfc_pm.h"
  22
  23 #define MFC_GATE_CLK_NAME       "mfc"
  24
  25 #define CLK_DEBUG
  26
  27 static struct s5p_mfc_pm *pm;
  28 static struct s5p_mfc_dev *p_dev;
  29
  30 #ifdef CLK_DEBUG
  31 static atomic_t clk_ref;
  32 #endif
  33
  34 int s5p_mfc_init_pm(struct s5p_mfc_dev *dev)
  35 {
  36         int ret = 0;
  37
  38         pm = &dev->pm;
  39         p_dev = dev;
  40         pm->clock_gate = clk_get(&dev->plat_dev->dev, MFC_GATE_CLK_NAME);
  41         if (IS_ERR(pm->clock_gate)) {
  42                 mfc_err("Failed to get clock-gating control\n");
  43                 ret = PTR_ERR(pm->clock_gate);
  44                 goto err_g_ip_clk;
  45         }
  46
  47         ret = clk_prepare(pm->clock_gate);
  48         if (ret) {
  49                 mfc_err("Failed to prepare clock-gating control\n");
  50                 goto err_p_ip_clk;
  51         }
  52
  53         atomic_set(&pm->power, 0);
  54 #ifdef CONFIG_PM_RUNTIME
  55         pm->device = &dev->plat_dev->dev;
  56         pm_runtime_enable(pm->device);
  57 #endif
  58 #ifdef CLK_DEBUG
  59         atomic_set(&clk_ref, 0);
  60 #endif
  61         return 0;
  62 err_p_ip_clk:
  63         clk_put(pm->clock_gate);
  64 err_g_ip_clk:
  65         return ret;
  66 }
  67
  68 void s5p_mfc_final_pm(struct s5p_mfc_dev *dev)
  69 {
  70         clk_unprepare(pm->clock_gate);
  71         clk_put(pm->clock_gate);
  72 #ifdef CONFIG_PM_RUNTIME
  73         pm_runtime_disable(pm->device);
  74 #endif
  75 }
  76
  77 int s5p_mfc_clock_on(void)
  78 {
  79         int ret;
  80 #ifdef CLK_DEBUG
  81         atomic_inc(&clk_ref);
  82         mfc_debug(3, "+ %d\n", atomic_read(&clk_ref));
  83 #endif
  84         ret = clk_enable(pm->clock_gate);
  85         return ret;
  86 }
  87
  88 void s5p_mfc_clock_off(void)
  89 {
  90 #ifdef CLK_DEBUG
  91         atomic_dec(&clk_ref);
  92         mfc_debug(3, "- %d\n", atomic_read(&clk_ref));
  93 #endif
  94         clk_disable(pm->clock_gate);
  95 }
  96
  97 int s5p_mfc_power_on(void)
  98 {
  99 #ifdef CONFIG_PM_RUNTIME
 100         return pm_runtime_get_sync(pm->device);
 101 #else
 102         atomic_set(&pm->power, 1);
 103         return 0;
 104 #endif
 105 }
 106
 107 int s5p_mfc_power_off(void)
 108 {
 109 #ifdef CONFIG_PM_RUNTIME
 110         return pm_runtime_put_sync(pm->device);
 111 #else
 112         atomic_set(&pm->power, 0);
 113         return 0;
 114 #endif
 115 }
 116
 117