drivers/gpu/drm/amd/display/dc/gpio/hw_generic.c

   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 #include <linux/slab.h>
  27
  28 #include "dm_services.h"
  29
  30 #include "include/gpio_interface.h"
  31 #include "include/gpio_types.h"
  32 #include "hw_gpio.h"
  33 #include "hw_generic.h"
  34
  35 #include "reg_helper.h"
  36 #include "generic_regs.h"
  37
  38 #undef FN
  39 #define FN(reg_name, field_name) \
  40         generic->shifts->field_name, generic->masks->field_name
  41
  42 #define CTX \
  43         generic->base.base.ctx
  44 #define REG(reg)\
  45         (generic->regs->reg)
  46
  47 struct gpio;
  48
  49 static void dal_hw_generic_destruct(
  50         struct hw_generic *pin)
  51 {
  52         dal_hw_gpio_destruct(&pin->base);
  53 }
  54
  55 static void dal_hw_generic_destroy(
  56         struct hw_gpio_pin **ptr)
  57 {
  58         struct hw_generic *generic = HW_GENERIC_FROM_BASE(*ptr);
  59
  60         dal_hw_generic_destruct(generic);
  61
  62         kfree(generic);
  63
  64         *ptr = NULL;
  65 }
  66
  67 static enum gpio_result set_config(
  68         struct hw_gpio_pin *ptr,
  69         const struct gpio_config_data *config_data)
  70 {
  71         struct hw_generic *generic = HW_GENERIC_FROM_BASE(ptr);
  72
  73         if (!config_data)
  74                 return GPIO_RESULT_INVALID_DATA;
  75
  76         REG_UPDATE_2(mux,
  77                 GENERIC_EN, config_data->config.generic_mux.enable_output_from_mux,
  78                 GENERIC_SEL, config_data->config.generic_mux.mux_select);
  79
  80         return GPIO_RESULT_OK;
  81 }
  82
  83 static const struct hw_gpio_pin_funcs funcs = {
  84         .destroy = dal_hw_generic_destroy,
  85         .open = dal_hw_gpio_open,
  86         .get_value = dal_hw_gpio_get_value,
  87         .set_value = dal_hw_gpio_set_value,
  88         .set_config = set_config,
  89         .change_mode = dal_hw_gpio_change_mode,
  90         .close = dal_hw_gpio_close,
  91 };
  92
  93 static void dal_hw_generic_construct(
  94         struct hw_generic *pin,
  95         enum gpio_id id,
  96         uint32_t en,
  97         struct dc_context *ctx)
  98 {
  99         dal_hw_gpio_construct(&pin->base, id, en, ctx);
 100         pin->base.base.funcs = &funcs;
 101 }
 102
 103 void dal_hw_generic_init(
 104         struct hw_generic **hw_generic,
 105         struct dc_context *ctx,
 106         enum gpio_id id,
 107         uint32_t en)
 108 {
 109         if ((en < GPIO_DDC_LINE_MIN) || (en > GPIO_DDC_LINE_MAX)) {
 110                 ASSERT_CRITICAL(false);
 111                 *hw_generic = NULL;
 112         }
 113
 114         *hw_generic = kzalloc(sizeof(struct hw_generic), GFP_KERNEL);
 115         if (!*hw_generic) {
 116                 ASSERT_CRITICAL(false);
 117                 return;
 118         }
 119
 120         dal_hw_generic_construct(*hw_generic, id, en, ctx);
 121 }
 122
 123
 124 struct hw_gpio_pin *dal_hw_generic_get_pin(struct gpio *gpio)
 125 {
 126         struct hw_generic *hw_generic = dal_gpio_get_generic(gpio);
 127
 128         return &hw_generic->base.base;
 129 }