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

   1 /*
   2  * Copyright (C) 2011-2012 ARM Limited. All rights reserved.
   3  *
   4  * This program is free software and is provided to you under the terms of the GNU General Public License version 2
   5  * as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
   6  *
   7  * A copy of the licence is included with the program, and can also be obtained from Free Software
   8  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
   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) /* @@@@ todo: change to init of some kind.. or change the way or where atomics are initialized? */
  30 {
  31         _mali_osk_atomic_init(&mali_pm_ref_count, 0);
  32 }
  33
  34 void _mali_osk_pm_dev_disable(void) /* @@@@ todo: change to term of some kind */
  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         {
  51                 MALI_PRINT_ERROR(("Mali OSK PM: pm_runtime_get_sync() returned error code %d\n", err));
  52                 return _MALI_OSK_ERR_FAULT;
  53         }
  54         _mali_osk_atomic_inc(&mali_pm_ref_count);
  55         MALI_DEBUG_PRINT(4, ("Mali OSK PM: Power ref taken (%u)\n", _mali_osk_atomic_read(&mali_pm_ref_count)));
  56 #endif
  57         return _MALI_OSK_ERR_OK;
  58 }
  59
  60 /* Can run in atomic context */
  61 void _mali_osk_pm_dev_ref_dec(void)
  62 {
  63 #ifdef CONFIG_PM_RUNTIME
  64         MALI_DEBUG_ASSERT_POINTER(mali_platform_device);
  65         _mali_osk_atomic_dec(&mali_pm_ref_count);
  66 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37))
  67         pm_runtime_mark_last_busy(&(mali_platform_device->dev));
  68         pm_runtime_put_autosuspend(&(mali_platform_device->dev));
  69 #else
  70         pm_runtime_put(&(mali_platform_device->dev));
  71 #endif
  72         MALI_DEBUG_PRINT(4, ("Mali OSK PM: Power ref released (%u)\n", _mali_osk_atomic_read(&mali_pm_ref_count)));
  73 #endif
  74 }
  75
  76 /* Can run in atomic context */
  77 mali_bool _mali_osk_pm_dev_ref_add_no_power_on(void)
  78 {
  79 #ifdef CONFIG_PM_RUNTIME
  80         u32 ref;
  81         MALI_DEBUG_ASSERT_POINTER(mali_platform_device);
  82         pm_runtime_get_noresume(&(mali_platform_device->dev));
  83         ref = _mali_osk_atomic_read(&mali_pm_ref_count);
  84         MALI_DEBUG_PRINT(4, ("Mali OSK PM: No-power ref taken (%u)\n", _mali_osk_atomic_read(&mali_pm_ref_count)));
  85         return ref > 0 ? MALI_TRUE : MALI_FALSE;
  86 #else
  87         return MALI_TRUE;
  88 #endif
  89 }
  90
  91 /* Can run in atomic context */
  92 void _mali_osk_pm_dev_ref_dec_no_power_on(void)
  93 {
  94 #ifdef CONFIG_PM_RUNTIME
  95         MALI_DEBUG_ASSERT_POINTER(mali_platform_device);
  96 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37))
  97         pm_runtime_put_autosuspend(&(mali_platform_device->dev));
  98 #else
  99         pm_runtime_put(&(mali_platform_device->dev));
 100 #endif
 101         MALI_DEBUG_PRINT(4, ("Mali OSK PM: No-power ref released (%u)\n", _mali_osk_atomic_read(&mali_pm_ref_count)));
 102 #endif
 103 }