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 #include <linux/pm_runtime.h>
  17 #include "s5p_mfc_common.h"
  18 #include "s5p_mfc_debug.h"
  19 #include "s5p_mfc_pm.h"
  20
  21 #define MFC_GATE_CLK_NAME       "mfc"
  22 #define MFC_SCLK_NAME           "sclk_mfc"
  23 #define MFC_SCLK_RATE           (200 * 1000000)
  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         if (dev->variant->version != MFC_VERSION_V6) {
  54                 pm->clock = clk_get(&dev->plat_dev->dev, MFC_SCLK_NAME);
  55                 if (IS_ERR(pm->clock)) {
  56                         mfc_info("Failed to get MFC special clock control\n");
  57                         pm->clock = NULL;
  58                 } else {
  59                         clk_set_rate(pm->clock, MFC_SCLK_RATE);
  60                         ret = clk_prepare_enable(pm->clock);
  61                         if (ret) {
  62                                 mfc_err("Failed to enable MFC special clock\n");
  63                                 goto err_s_clk;
  64                         }
  65                 }
  66         }
  67
  68         atomic_set(&pm->power, 0);
  69 #ifdef CONFIG_PM
  70         pm->device = &dev->plat_dev->dev;
  71         pm_runtime_enable(pm->device);
  72 #endif
  73 #ifdef CLK_DEBUG
  74         atomic_set(&clk_ref, 0);
  75 #endif
  76         return 0;
  77
  78 err_s_clk:
  79         clk_put(pm->clock);
  80         pm->clock = NULL;
  81 err_p_ip_clk:
  82         clk_put(pm->clock_gate);
  83         pm->clock_gate = NULL;
  84 err_g_ip_clk:
  85         return ret;
  86 }
  87
  88 void s5p_mfc_final_pm(struct s5p_mfc_dev *dev)
  89 {
  90         if (dev->variant->version != MFC_VERSION_V6 &&
  91             pm->clock) {
  92                 clk_disable_unprepare(pm->clock);
  93                 clk_put(pm->clock);
  94                 pm->clock = NULL;
  95         }
  96         clk_unprepare(pm->clock_gate);
  97         clk_put(pm->clock_gate);
  98         pm->clock_gate = NULL;
  99 #ifdef CONFIG_PM
 100         pm_runtime_disable(pm->device);
 101 #endif
 102 }
 103
 104 int s5p_mfc_clock_on(void)
 105 {
 106         int ret = 0;
 107 #ifdef CLK_DEBUG
 108         atomic_inc(&clk_ref);
 109         mfc_debug(3, "+ %d\n", atomic_read(&clk_ref));
 110 #endif
 111         if (!IS_ERR_OR_NULL(pm->clock_gate))
 112                 ret = clk_enable(pm->clock_gate);
 113         return ret;
 114 }
 115
 116 void s5p_mfc_clock_off(void)
 117 {
 118 #ifdef CLK_DEBUG
 119         atomic_dec(&clk_ref);
 120         mfc_debug(3, "- %d\n", atomic_read(&clk_ref));
 121 #endif
 122         if (!IS_ERR_OR_NULL(pm->clock_gate))
 123                 clk_disable(pm->clock_gate);
 124 }
 125
 126 int s5p_mfc_power_on(void)
 127 {
 128 #ifdef CONFIG_PM
 129         return pm_runtime_get_sync(pm->device);
 130 #else
 131         atomic_set(&pm->power, 1);
 132         return 0;
 133 #endif
 134 }
 135
 136 int s5p_mfc_power_off(void)
 137 {
 138 #ifdef CONFIG_PM
 139         return pm_runtime_put_sync(pm->device);
 140 #else
 141         atomic_set(&pm->power, 0);
 142         return 0;
 143 #endif
 144 }
 145
 146