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_CLKNAME             "sclk_mfc"
  24 #define MFC_GATE_CLK_NAME       "mfc"
  25
  26 #define CLK_DEBUG
  27
  28 static struct s5p_mfc_pm *pm;
  29 static struct s5p_mfc_dev *p_dev;
  30
  31 #ifdef CLK_DEBUG
  32 atomic_t clk_ref;
  33 #endif
  34
  35 int s5p_mfc_init_pm(struct s5p_mfc_dev *dev)
  36 {
  37         int ret = 0;
  38
  39         pm = &dev->pm;
  40         p_dev = dev;
  41         pm->clock_gate = clk_get(&dev->plat_dev->dev, MFC_GATE_CLK_NAME);
  42         if (IS_ERR(pm->clock_gate)) {
  43                 mfc_err("Failed to get clock-gating control\n");
  44                 ret = PTR_ERR(pm->clock_gate);
  45                 goto err_g_ip_clk;
  46         }
  47
  48         ret = clk_prepare(pm->clock_gate);
  49         if (ret) {
  50                 mfc_err("Failed to preapre clock-gating control\n");
  51                 goto err_p_ip_clk;
  52         }
  53
  54         pm->clock = clk_get(&dev->plat_dev->dev, MFC_CLKNAME);
  55         if (IS_ERR(pm->clock)) {
  56                 mfc_err("Failed to get MFC clock\n");
  57                 ret = PTR_ERR(pm->clock);
  58                 goto err_g_ip_clk_2;
  59         }
  60
  61         ret = clk_prepare(pm->clock);
  62         if (ret) {
  63                 mfc_err("Failed to prepare MFC clock\n");
  64                 goto err_p_ip_clk_2;
  65         }
  66
  67         atomic_set(&pm->power, 0);
  68 #ifdef CONFIG_PM_RUNTIME
  69         pm->device = &dev->plat_dev->dev;
  70         pm_runtime_enable(pm->device);
  71 #endif
  72 #ifdef CLK_DEBUG
  73         atomic_set(&clk_ref, 0);
  74 #endif
  75         return 0;
  76 err_p_ip_clk_2:
  77         clk_put(pm->clock);
  78 err_g_ip_clk_2:
  79         clk_unprepare(pm->clock_gate);
  80 err_p_ip_clk:
  81         clk_put(pm->clock_gate);
  82 err_g_ip_clk:
  83         return ret;
  84 }
  85
  86 void s5p_mfc_final_pm(struct s5p_mfc_dev *dev)
  87 {
  88         clk_unprepare(pm->clock_gate);
  89         clk_put(pm->clock_gate);
  90         clk_unprepare(pm->clock);
  91         clk_put(pm->clock);
  92 #ifdef CONFIG_PM_RUNTIME
  93         pm_runtime_disable(pm->device);
  94 #endif
  95 }
  96
  97 int s5p_mfc_clock_on(void)
  98 {
  99         int ret;
 100 #ifdef CLK_DEBUG
 101         atomic_inc(&clk_ref);
 102         mfc_debug(3, "+ %d", atomic_read(&clk_ref));
 103 #endif
 104         ret = clk_enable(pm->clock_gate);
 105         return ret;
 106 }
 107
 108 void s5p_mfc_clock_off(void)
 109 {
 110 #ifdef CLK_DEBUG
 111         atomic_dec(&clk_ref);
 112         mfc_debug(3, "- %d", atomic_read(&clk_ref));
 113 #endif
 114         clk_disable(pm->clock_gate);
 115 }
 116
 117 int s5p_mfc_power_on(void)
 118 {
 119 #ifdef CONFIG_PM_RUNTIME
 120         return pm_runtime_get_sync(pm->device);
 121 #else
 122         atomic_set(&pm->power, 1);
 123         return 0;
 124 #endif
 125 }
 126
 127 int s5p_mfc_power_off(void)
 128 {
 129 #ifdef CONFIG_PM_RUNTIME
 130         return pm_runtime_put_sync(pm->device);
 131 #else
 132         atomic_set(&pm->power, 0);
 133         return 0;
 134 #endif
 135 }
 136
 137