root/drivers/gpu/drm/amd/display/dc/gpio/hw_hpd.c

DEFINITIONS

1. dal_hw_hpd_construct
2. dal_hw_hpd_destruct
3. destruct
4. destroy
5. get_value
6. set_config
7. construct
8. dal_hw_hpd_init
9. dal_hw_hpd_get_pin

   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_hpd.h"
  34 
  35 #include "reg_helper.h"
  36 #include "hpd_regs.h"
  37 
  38 #undef FN
  39 #define FN(reg_name, field_name) \
  40         hpd->shifts->field_name, hpd->masks->field_name
  41 
  42 #define CTX \
  43         hpd->base.base.ctx
  44 #define REG(reg)\
  45         (hpd->regs->reg)
  46 
  47 struct gpio;
  48 
  49 static void dal_hw_hpd_construct(
  50         struct hw_hpd *pin,
  51         enum gpio_id id,
  52         uint32_t en,
  53         struct dc_context *ctx)
  54 {
  55         dal_hw_gpio_construct(&pin->base, id, en, ctx);
  56 }
  57 
  58 static void dal_hw_hpd_destruct(
  59         struct hw_hpd *pin)
  60 {
  61         dal_hw_gpio_destruct(&pin->base);
  62 }
  63 
  64 
  65 static void destruct(
  66         struct hw_hpd *hpd)
  67 {
  68         dal_hw_hpd_destruct(hpd);
  69 }
  70 
  71 static void destroy(
  72         struct hw_gpio_pin **ptr)
  73 {
  74         struct hw_hpd *hpd = HW_HPD_FROM_BASE(*ptr);
  75 
  76         destruct(hpd);
  77 
  78         kfree(hpd);
  79 
  80         *ptr = NULL;
  81 }
  82 
  83 static enum gpio_result get_value(
  84         const struct hw_gpio_pin *ptr,
  85         uint32_t *value)
  86 {
  87         struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr);
  88         uint32_t hpd_delayed = 0;
  89 
  90         /* in Interrupt mode we ask for SENSE bit */
  91 
  92         if (ptr->mode == GPIO_MODE_INTERRUPT) {
  93 
  94                 REG_GET(int_status,
  95                         DC_HPD_SENSE_DELAYED, &hpd_delayed);
  96 
  97                 *value = hpd_delayed;
  98                 return GPIO_RESULT_OK;
  99         }
 100 
 101         /* in any other modes, operate as normal GPIO */
 102 
 103         return dal_hw_gpio_get_value(ptr, value);
 104 }
 105 
 106 static enum gpio_result set_config(
 107         struct hw_gpio_pin *ptr,
 108         const struct gpio_config_data *config_data)
 109 {
 110         struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr);
 111 
 112         if (!config_data)
 113                 return GPIO_RESULT_INVALID_DATA;
 114 
 115         REG_UPDATE_2(toggle_filt_cntl,
 116                 DC_HPD_CONNECT_INT_DELAY, config_data->config.hpd.delay_on_connect / 10,
 117                 DC_HPD_DISCONNECT_INT_DELAY, config_data->config.hpd.delay_on_disconnect / 10);
 118 
 119         return GPIO_RESULT_OK;
 120 }
 121 
 122 static const struct hw_gpio_pin_funcs funcs = {
 123         .destroy = destroy,
 124         .open = dal_hw_gpio_open,
 125         .get_value = get_value,
 126         .set_value = dal_hw_gpio_set_value,
 127         .set_config = set_config,
 128         .change_mode = dal_hw_gpio_change_mode,
 129         .close = dal_hw_gpio_close,
 130 };
 131 
 132 static void construct(
 133         struct hw_hpd *hpd,
 134         enum gpio_id id,
 135         uint32_t en,
 136         struct dc_context *ctx)
 137 {
 138         dal_hw_hpd_construct(hpd, id, en, ctx);
 139         hpd->base.base.funcs = &funcs;
 140 }
 141 
 142 void dal_hw_hpd_init(
 143         struct hw_hpd **hw_hpd,
 144         struct dc_context *ctx,
 145         enum gpio_id id,
 146         uint32_t en)
 147 {
 148         if ((en < GPIO_DDC_LINE_MIN) || (en > GPIO_DDC_LINE_MAX)) {
 149                 ASSERT_CRITICAL(false);
 150                 *hw_hpd = NULL;
 151         }
 152 
 153         *hw_hpd = kzalloc(sizeof(struct hw_hpd), GFP_KERNEL);
 154         if (!*hw_hpd) {
 155                 ASSERT_CRITICAL(false);
 156                 return;
 157         }
 158 
 159         construct(*hw_hpd, id, en, ctx);
 160 }
 161 
 162 struct hw_gpio_pin *dal_hw_hpd_get_pin(struct gpio *gpio)
 163 {
 164         struct hw_hpd *hw_hpd = dal_gpio_get_hpd(gpio);
 165 
 166         return &hw_hpd->base.base;
 167 }