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         pm->clock = clk_get(&dev->plat_dev->dev, dev->variant->mclk_name);
  54         if (IS_ERR(pm->clock)) {
  55                 mfc_err("Failed to get MFC clock\n");
  56                 ret = PTR_ERR(pm->clock);
  57                 goto err_g_ip_clk_2;
  58         }
  59
  60         ret = clk_prepare(pm->clock);
  61         if (ret) {
  62                 mfc_err("Failed to prepare MFC clock\n");
  63                 goto err_p_ip_clk_2;
  64         }
  65
  66         atomic_set(&pm->power, 0);
  67 #ifdef CONFIG_PM_RUNTIME
  68         pm->device = &dev->plat_dev->dev;
  69         pm_runtime_enable(pm->device);
  70 #endif
  71 #ifdef CLK_DEBUG
  72         atomic_set(&clk_ref, 0);
  73 #endif
  74         return 0;
  75 err_p_ip_clk_2:
  76         clk_put(pm->clock);
  77 err_g_ip_clk_2:
  78         clk_unprepare(pm->clock_gate);
  79 err_p_ip_clk:
  80         clk_put(pm->clock_gate);
  81 err_g_ip_clk:
  82         return ret;
  83 }
  84
  85 void s5p_mfc_final_pm(struct s5p_mfc_dev *dev)
  86 {
  87         clk_unprepare(pm->clock_gate);
  88         clk_put(pm->clock_gate);
  89         clk_unprepare(pm->clock);
  90         clk_put(pm->clock);
  91 #ifdef CONFIG_PM_RUNTIME
  92         pm_runtime_disable(pm->device);
  93 #endif
  94 }
  95
  96 int s5p_mfc_clock_on(void)
  97 {
  98         int ret;
  99 #ifdef CLK_DEBUG
 100         atomic_inc(&clk_ref);
 101         mfc_debug(3, "+ %d", atomic_read(&clk_ref));
 102 #endif
 103         ret = clk_enable(pm->clock_gate);
 104         return ret;
 105 }
 106
 107 void s5p_mfc_clock_off(void)
 108 {
 109 #ifdef CLK_DEBUG
 110         atomic_dec(&clk_ref);
 111         mfc_debug(3, "- %d", atomic_read(&clk_ref));
 112 #endif
 113         clk_disable(pm->clock_gate);
 114 }
 115
 116 int s5p_mfc_power_on(void)
 117 {
 118 #ifdef CONFIG_PM_RUNTIME
 119         return pm_runtime_get_sync(pm->device);
 120 #else
 121         atomic_set(&pm->power, 1);
 122         return 0;
 123 #endif
 124 }
 125
 126 int s5p_mfc_power_off(void)
 127 {
 128 #ifdef CONFIG_PM_RUNTIME
 129         return pm_runtime_put_sync(pm->device);
 130 #else
 131         atomic_set(&pm->power, 0);
 132         return 0;
 133 #endif
 134 }
 135
 136