drivers/gpu/drm/amd/display/dc/gpio/hw_gpio.h

   1 /*
   2  * Copyright 2012-15 Advanced Micro Devices, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: AMD
  23  *
  24  */
  25
  26 #ifndef __DAL_HW_GPIO_H__
  27 #define __DAL_HW_GPIO_H__
  28
  29 #include "gpio_regs.h"
  30
  31 #define FROM_HW_GPIO_PIN(ptr) \
  32         container_of((ptr), struct hw_gpio, base)
  33
  34 struct addr_mask {
  35         uint32_t addr;
  36         uint32_t mask;
  37 };
  38
  39 struct hw_gpio_pin {
  40         const struct hw_gpio_pin_funcs *funcs;
  41         enum gpio_id id;
  42         uint32_t en;
  43         enum gpio_mode mode;
  44         bool opened;
  45         struct dc_context *ctx;
  46 };
  47
  48 struct hw_gpio_pin_funcs {
  49         void (*destroy)(
  50                 struct hw_gpio_pin **ptr);
  51         bool (*open)(
  52                 struct hw_gpio_pin *pin,
  53                 enum gpio_mode mode);
  54         enum gpio_result (*get_value)(
  55                 const struct hw_gpio_pin *pin,
  56                 uint32_t *value);
  57         enum gpio_result (*set_value)(
  58                 const struct hw_gpio_pin *pin,
  59                 uint32_t value);
  60         enum gpio_result (*set_config)(
  61                 struct hw_gpio_pin *pin,
  62                 const struct gpio_config_data *config_data);
  63         enum gpio_result (*change_mode)(
  64                 struct hw_gpio_pin *pin,
  65                 enum gpio_mode mode);
  66         void (*close)(
  67                 struct hw_gpio_pin *pin);
  68 };
  69
  70
  71 struct hw_gpio;
  72
  73 /* Register indices are represented by member variables
  74  * and are to be filled in by constructors of derived classes.
  75  * These members permit the use of common code
  76  * for programming registers, where the sequence is the same
  77  * but register sets are different.
  78  * Some GPIOs have HW mux which allows to choose
  79  * what is the source of the signal in HW mode */
  80
  81 struct hw_gpio_pin_reg {
  82         struct addr_mask DC_GPIO_DATA_MASK;
  83         struct addr_mask DC_GPIO_DATA_A;
  84         struct addr_mask DC_GPIO_DATA_EN;
  85         struct addr_mask DC_GPIO_DATA_Y;
  86 };
  87
  88 struct hw_gpio_mux_reg {
  89         struct addr_mask GPIO_MUX_CONTROL;
  90         struct addr_mask GPIO_MUX_STEREO_SEL;
  91 };
  92
  93 struct hw_gpio {
  94         struct hw_gpio_pin base;
  95
  96         /* variables to save register value */
  97         struct {
  98                 uint32_t mask;
  99                 uint32_t a;
 100                 uint32_t en;
 101                 uint32_t mux;
 102         } store;
 103
 104         /* GPIO MUX support */
 105         bool mux_supported;
 106         const struct gpio_registers *regs;
 107 };
 108
 109 #define HW_GPIO_FROM_BASE(hw_gpio_pin) \
 110         container_of((hw_gpio_pin), struct hw_gpio, base)
 111
 112 void dal_hw_gpio_construct(
 113         struct hw_gpio *pin,
 114         enum gpio_id id,
 115         uint32_t en,
 116         struct dc_context *ctx);
 117
 118 bool dal_hw_gpio_open(
 119         struct hw_gpio_pin *pin,
 120         enum gpio_mode mode);
 121
 122 enum gpio_result dal_hw_gpio_get_value(
 123         const struct hw_gpio_pin *pin,
 124         uint32_t *value);
 125
 126 enum gpio_result dal_hw_gpio_config_mode(
 127         struct hw_gpio *pin,
 128         enum gpio_mode mode);
 129
 130 void dal_hw_gpio_destruct(
 131         struct hw_gpio *pin);
 132
 133 enum gpio_result dal_hw_gpio_set_value(
 134         const struct hw_gpio_pin *ptr,
 135         uint32_t value);
 136
 137 enum gpio_result dal_hw_gpio_change_mode(
 138         struct hw_gpio_pin *ptr,
 139         enum gpio_mode mode);
 140
 141 void dal_hw_gpio_close(
 142         struct hw_gpio_pin *ptr);
 143
 144 #endif