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 <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_destruct(
  50         struct hw_hpd *pin)
  51 {
  52         dal_hw_gpio_destruct(&pin->base);
  53 }
  54
  55 static void dal_hw_hpd_destroy(
  56         struct hw_gpio_pin **ptr)
  57 {
  58         struct hw_hpd *hpd = HW_HPD_FROM_BASE(*ptr);
  59
  60         dal_hw_hpd_destruct(hpd);
  61
  62         kfree(hpd);
  63
  64         *ptr = NULL;
  65 }
  66
  67 static enum gpio_result get_value(
  68         const struct hw_gpio_pin *ptr,
  69         uint32_t *value)
  70 {
  71         struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr);
  72         uint32_t hpd_delayed = 0;
  73
  74         /* in Interrupt mode we ask for SENSE bit */
  75
  76         if (ptr->mode == GPIO_MODE_INTERRUPT) {
  77
  78                 REG_GET(int_status,
  79                         DC_HPD_SENSE_DELAYED, &hpd_delayed);
  80
  81                 *value = hpd_delayed;
  82                 return GPIO_RESULT_OK;
  83         }
  84
  85         /* in any other modes, operate as normal GPIO */
  86
  87         return dal_hw_gpio_get_value(ptr, value);
  88 }
  89
  90 static enum gpio_result set_config(
  91         struct hw_gpio_pin *ptr,
  92         const struct gpio_config_data *config_data)
  93 {
  94         struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr);
  95
  96         if (!config_data)
  97                 return GPIO_RESULT_INVALID_DATA;
  98
  99         REG_UPDATE_2(toggle_filt_cntl,
 100                 DC_HPD_CONNECT_INT_DELAY, config_data->config.hpd.delay_on_connect / 10,
 101                 DC_HPD_DISCONNECT_INT_DELAY, config_data->config.hpd.delay_on_disconnect / 10);
 102
 103         return GPIO_RESULT_OK;
 104 }
 105
 106 static const struct hw_gpio_pin_funcs funcs = {
 107         .destroy = dal_hw_hpd_destroy,
 108         .open = dal_hw_gpio_open,
 109         .get_value = get_value,
 110         .set_value = dal_hw_gpio_set_value,
 111         .set_config = set_config,
 112         .change_mode = dal_hw_gpio_change_mode,
 113         .close = dal_hw_gpio_close,
 114 };
 115
 116 static void dal_hw_hpd_construct(
 117         struct hw_hpd *pin,
 118         enum gpio_id id,
 119         uint32_t en,
 120         struct dc_context *ctx)
 121 {
 122         dal_hw_gpio_construct(&pin->base, id, en, ctx);
 123         pin->base.base.funcs = &funcs;
 124 }
 125
 126 void dal_hw_hpd_init(
 127         struct hw_hpd **hw_hpd,
 128         struct dc_context *ctx,
 129         enum gpio_id id,
 130         uint32_t en)
 131 {
 132         if ((en < GPIO_DDC_LINE_MIN) || (en > GPIO_DDC_LINE_MAX)) {
 133                 ASSERT_CRITICAL(false);
 134                 *hw_hpd = NULL;
 135         }
 136
 137         *hw_hpd = kzalloc(sizeof(struct hw_hpd), GFP_KERNEL);
 138         if (!*hw_hpd) {
 139                 ASSERT_CRITICAL(false);
 140                 return;
 141         }
 142
 143         dal_hw_hpd_construct(*hw_hpd, id, en, ctx);
 144 }
 145
 146 struct hw_gpio_pin *dal_hw_hpd_get_pin(struct gpio *gpio)
 147 {
 148         struct hw_hpd *hw_hpd = dal_gpio_get_hpd(gpio);
 149
 150         return &hw_hpd->base.base;
 151 }