drivers/gpu/drm/amd/display/dc/gpio/hw_hpd.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 "dm_services.h"
  27
  28 #include "include/gpio_types.h"
  29 #include "hw_gpio.h"
  30 #include "hw_hpd.h"
  31
  32 #include "reg_helper.h"
  33 #include "hpd_regs.h"
  34
  35 #undef FN
  36 #define FN(reg_name, field_name) \
  37         hpd->shifts->field_name, hpd->masks->field_name
  38
  39 #define CTX \
  40         hpd->base.base.ctx
  41 #define REG(reg)\
  42         (hpd->regs->reg)
  43
  44 static bool dal_hw_hpd_construct(
  45         struct hw_hpd *pin,
  46         enum gpio_id id,
  47         uint32_t en,
  48         struct dc_context *ctx)
  49 {
  50         if (!dal_hw_gpio_construct(&pin->base, id, en, ctx))
  51                 return false;
  52         return true;
  53 }
  54
  55 static void dal_hw_hpd_destruct(
  56         struct hw_hpd *pin)
  57 {
  58         dal_hw_gpio_destruct(&pin->base);
  59 }
  60
  61
  62 static void destruct(
  63         struct hw_hpd *hpd)
  64 {
  65         dal_hw_hpd_destruct(hpd);
  66 }
  67
  68 static void destroy(
  69         struct hw_gpio_pin **ptr)
  70 {
  71         struct hw_hpd *hpd = HW_HPD_FROM_BASE(*ptr);
  72
  73         destruct(hpd);
  74
  75         dm_free(hpd);
  76
  77         *ptr = NULL;
  78 }
  79
  80 static enum gpio_result get_value(
  81         const struct hw_gpio_pin *ptr,
  82         uint32_t *value)
  83 {
  84         struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr);
  85         uint32_t hpd_delayed = 0;
  86
  87         /* in Interrupt mode we ask for SENSE bit */
  88
  89         if (ptr->mode == GPIO_MODE_INTERRUPT) {
  90
  91                 REG_GET(int_status,
  92                         DC_HPD_SENSE_DELAYED, &hpd_delayed);
  93
  94                 *value = hpd_delayed;
  95                 return GPIO_RESULT_OK;
  96         }
  97
  98         /* in any other modes, operate as normal GPIO */
  99
 100         return dal_hw_gpio_get_value(ptr, value);
 101 }
 102
 103 static enum gpio_result set_config(
 104         struct hw_gpio_pin *ptr,
 105         const struct gpio_config_data *config_data)
 106 {
 107         struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr);
 108
 109         if (!config_data)
 110                 return GPIO_RESULT_INVALID_DATA;
 111
 112         REG_UPDATE_2(toggle_filt_cntl,
 113                 DC_HPD_CONNECT_INT_DELAY, config_data->config.hpd.delay_on_connect / 10,
 114                 DC_HPD_DISCONNECT_INT_DELAY, config_data->config.hpd.delay_on_disconnect / 10);
 115
 116         return GPIO_RESULT_OK;
 117 }
 118
 119 static const struct hw_gpio_pin_funcs funcs = {
 120         .destroy = destroy,
 121         .open = dal_hw_gpio_open,
 122         .get_value = get_value,
 123         .set_value = dal_hw_gpio_set_value,
 124         .set_config = set_config,
 125         .change_mode = dal_hw_gpio_change_mode,
 126         .close = dal_hw_gpio_close,
 127 };
 128
 129 static bool construct(
 130         struct hw_hpd *hpd,
 131         enum gpio_id id,
 132         uint32_t en,
 133         struct dc_context *ctx)
 134 {
 135         if (id != GPIO_ID_HPD) {
 136                 ASSERT_CRITICAL(false);
 137                 return false;
 138         }
 139
 140         if ((en < GPIO_HPD_MIN) || (en > GPIO_HPD_MAX)) {
 141                 ASSERT_CRITICAL(false);
 142                 return false;
 143         }
 144
 145         if (!dal_hw_hpd_construct(hpd, id, en, ctx)) {
 146                 ASSERT_CRITICAL(false);
 147                 return false;
 148         }
 149
 150         hpd->base.base.funcs = &funcs;
 151
 152         return true;
 153 }
 154
 155 struct hw_gpio_pin *dal_hw_hpd_create(
 156         struct dc_context *ctx,
 157         enum gpio_id id,
 158         uint32_t en)
 159 {
 160         struct hw_hpd *hpd = dm_alloc(sizeof(struct hw_hpd));
 161
 162         if (!hpd) {
 163                 ASSERT_CRITICAL(false);
 164                 return NULL;
 165         }
 166
 167         if (construct(hpd, id, en, ctx))
 168                 return &hpd->base.base;
 169
 170         ASSERT_CRITICAL(false);
 171
 172         dm_free(hpd);
 173
 174         return NULL;
 175 }