drivers/gpu/arm/mali400/mali/linux/mali_osk_pm.c

   1 /**
   2  * This confidential and proprietary software may be used only as
   3  * authorised by a licensing agreement from ARM Limited
   4  * (C) COPYRIGHT 2010-2013 ARM Limited
   5  * ALL RIGHTS RESERVED
   6  * The entire notice above must be reproduced on all authorised
   7  * copies and copies may only be made to the extent permitted
   8  * by a licensing agreement from ARM Limited.
   9  */
  10
  11 /**
  12  * @file mali_osk_pm.c
  13  * Implementation of the callback functions from common power management
  14  */
  15
  16 #include <linux/sched.h>
  17
  18 #ifdef CONFIG_PM_RUNTIME
  19 #include <linux/pm_runtime.h>
  20 #endif /* CONFIG_PM_RUNTIME */
  21 #include <linux/platform_device.h>
  22 #include <linux/version.h>
  23 #include "mali_osk.h"
  24 #include "mali_kernel_common.h"
  25 #include "mali_kernel_linux.h"
  26
  27 static _mali_osk_atomic_t mali_pm_ref_count;
  28
  29 void _mali_osk_pm_dev_enable(void)
  30 {
  31         _mali_osk_atomic_init(&mali_pm_ref_count, 0);
  32 }
  33
  34 void _mali_osk_pm_dev_disable(void)
  35 {
  36         _mali_osk_atomic_term(&mali_pm_ref_count);
  37 }
  38
  39 /* Can NOT run in atomic context */
  40 _mali_osk_errcode_t _mali_osk_pm_dev_ref_add(void)
  41 {
  42 #ifdef CONFIG_PM_RUNTIME
  43         int err;
  44         MALI_DEBUG_ASSERT_POINTER(mali_platform_device);
  45         err = pm_runtime_get_sync(&(mali_platform_device->dev));
  46 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37))
  47         pm_runtime_mark_last_busy(&(mali_platform_device->dev));
  48 #endif
  49         if (0 > err) {
  50                 MALI_PRINT_ERROR(("Mali OSK PM: pm_runtime_get_sync() returned error code %d\n", err));
  51                 return _MALI_OSK_ERR_FAULT;
  52         }
  53         _mali_osk_atomic_inc(&mali_pm_ref_count);
  54         MALI_DEBUG_PRINT(4, ("Mali OSK PM: Power ref taken (%u)\n", _mali_osk_atomic_read(&mali_pm_ref_count)));
  55 #endif
  56         return _MALI_OSK_ERR_OK;
  57 }
  58
  59 /* Can run in atomic context */
  60 void _mali_osk_pm_dev_ref_dec(void)
  61 {
  62 #ifdef CONFIG_PM_RUNTIME
  63         MALI_DEBUG_ASSERT_POINTER(mali_platform_device);
  64         _mali_osk_atomic_dec(&mali_pm_ref_count);
  65 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37))
  66         pm_runtime_mark_last_busy(&(mali_platform_device->dev));
  67         pm_runtime_put_autosuspend(&(mali_platform_device->dev));
  68 #else
  69         pm_runtime_put(&(mali_platform_device->dev));
  70 #endif
  71         MALI_DEBUG_PRINT(4, ("Mali OSK PM: Power ref released (%u)\n", _mali_osk_atomic_read(&mali_pm_ref_count)));
  72 #endif
  73 }
  74
  75 /* Can run in atomic context */
  76 mali_bool _mali_osk_pm_dev_ref_add_no_power_on(void)
  77 {
  78 #ifdef CONFIG_PM_RUNTIME
  79         u32 ref;
  80         MALI_DEBUG_ASSERT_POINTER(mali_platform_device);
  81         pm_runtime_get_noresume(&(mali_platform_device->dev));
  82         ref = _mali_osk_atomic_read(&mali_pm_ref_count);
  83         MALI_DEBUG_PRINT(4, ("Mali OSK PM: No-power ref taken (%u)\n", _mali_osk_atomic_read(&mali_pm_ref_count)));
  84         return ref > 0 ? MALI_TRUE : MALI_FALSE;
  85 #else
  86         return MALI_TRUE;
  87 #endif
  88 }
  89
  90 /* Can run in atomic context */
  91 void _mali_osk_pm_dev_ref_dec_no_power_on(void)
  92 {
  93 #ifdef CONFIG_PM_RUNTIME
  94         MALI_DEBUG_ASSERT_POINTER(mali_platform_device);
  95 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37))
  96         pm_runtime_put_autosuspend(&(mali_platform_device->dev));
  97 #else
  98         pm_runtime_put(&(mali_platform_device->dev));
  99 #endif
 100         MALI_DEBUG_PRINT(4, ("Mali OSK PM: No-power ref released (%u)\n", _mali_osk_atomic_read(&mali_pm_ref_count)));
 101 #endif
 102 }
 103
 104 void _mali_osk_pm_dev_barrier(void)
 105 {
 106 #ifdef CONFIG_PM_RUNTIME
 107         pm_runtime_barrier(&(mali_platform_device->dev));
 108 #endif
 109 }