include/linux/clk/tegra.h

   1 /*
   2  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #ifndef __LINUX_CLK_TEGRA_H_
  18 #define __LINUX_CLK_TEGRA_H_
  19
  20 #include <linux/clk.h>
  21
  22 /*
  23  * Tegra CPU clock and reset control ops
  24  *
  25  * wait_for_reset:
  26  *      keep waiting until the CPU in reset state
  27  * put_in_reset:
  28  *      put the CPU in reset state
  29  * out_of_reset:
  30  *      release the CPU from reset state
  31  * enable_clock:
  32  *      CPU clock un-gate
  33  * disable_clock:
  34  *      CPU clock gate
  35  * rail_off_ready:
  36  *      CPU is ready for rail off
  37  * suspend:
  38  *      save the clock settings when CPU go into low-power state
  39  * resume:
  40  *      restore the clock settings when CPU exit low-power state
  41  */
  42 struct tegra_cpu_car_ops {
  43         void (*wait_for_reset)(u32 cpu);
  44         void (*put_in_reset)(u32 cpu);
  45         void (*out_of_reset)(u32 cpu);
  46         void (*enable_clock)(u32 cpu);
  47         void (*disable_clock)(u32 cpu);
  48 #ifdef CONFIG_PM_SLEEP
  49         bool (*rail_off_ready)(void);
  50         void (*suspend)(void);
  51         void (*resume)(void);
  52 #endif
  53 };
  54
  55 extern struct tegra_cpu_car_ops *tegra_cpu_car_ops;
  56
  57 static inline void tegra_wait_cpu_in_reset(u32 cpu)
  58 {
  59         if (WARN_ON(!tegra_cpu_car_ops->wait_for_reset))
  60                 return;
  61
  62         tegra_cpu_car_ops->wait_for_reset(cpu);
  63 }
  64
  65 static inline void tegra_put_cpu_in_reset(u32 cpu)
  66 {
  67         if (WARN_ON(!tegra_cpu_car_ops->put_in_reset))
  68                 return;
  69
  70         tegra_cpu_car_ops->put_in_reset(cpu);
  71 }
  72
  73 static inline void tegra_cpu_out_of_reset(u32 cpu)
  74 {
  75         if (WARN_ON(!tegra_cpu_car_ops->out_of_reset))
  76                 return;
  77
  78         tegra_cpu_car_ops->out_of_reset(cpu);
  79 }
  80
  81 static inline void tegra_enable_cpu_clock(u32 cpu)
  82 {
  83         if (WARN_ON(!tegra_cpu_car_ops->enable_clock))
  84                 return;
  85
  86         tegra_cpu_car_ops->enable_clock(cpu);
  87 }
  88
  89 static inline void tegra_disable_cpu_clock(u32 cpu)
  90 {
  91         if (WARN_ON(!tegra_cpu_car_ops->disable_clock))
  92                 return;
  93
  94         tegra_cpu_car_ops->disable_clock(cpu);
  95 }
  96
  97 #ifdef CONFIG_PM_SLEEP
  98 static inline bool tegra_cpu_rail_off_ready(void)
  99 {
 100         if (WARN_ON(!tegra_cpu_car_ops->rail_off_ready))
 101                 return false;
 102
 103         return tegra_cpu_car_ops->rail_off_ready();
 104 }
 105
 106 static inline void tegra_cpu_clock_suspend(void)
 107 {
 108         if (WARN_ON(!tegra_cpu_car_ops->suspend))
 109                 return;
 110
 111         tegra_cpu_car_ops->suspend();
 112 }
 113
 114 static inline void tegra_cpu_clock_resume(void)
 115 {
 116         if (WARN_ON(!tegra_cpu_car_ops->resume))
 117                 return;
 118
 119         tegra_cpu_car_ops->resume();
 120 }
 121 #endif
 122
 123 #ifdef CONFIG_ARCH_TEGRA
 124 void tegra_periph_reset_deassert(struct clk *c);
 125 void tegra_periph_reset_assert(struct clk *c);
 126 #else
 127 static inline void tegra_periph_reset_deassert(struct clk *c) {}
 128 static inline void tegra_periph_reset_assert(struct clk *c) {}
 129 #endif
 130 void tegra_clocks_apply_init_table(void);
 131
 132 #endif /* __LINUX_CLK_TEGRA_H_ */