LXR linux/drivers/gpu/drm/amd/display/dc/gpio/hw

   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_types.h"
  31#include "hw_gpio.h"
  32#include "hw_hpd.h"
  33
  34#include "reg_helper.h"
  35#include "hpd_regs.h"
  36
  37#undef FN
  38#define FN(reg_name, field_name) \
  39        hpd->shifts->field_name, hpd->masks->field_name
  40
  41#define CTX \
  42        hpd->base.base.ctx
  43#define REG(reg)\
  44        (hpd->regs->reg)
  45
  46static void dal_hw_hpd_construct(
  47        struct hw_hpd *pin,
  48        enum gpio_id id,
  49        uint32_t en,
  50        struct dc_context *ctx)
  51{
  52        dal_hw_gpio_construct(&pin->base, id, en, ctx);
  53}
  54
  55static void dal_hw_hpd_destruct(
  56        struct hw_hpd *pin)
  57{
  58        dal_hw_gpio_destruct(&pin->base);
  59}
  60
  61
  62static void destruct(
  63        struct hw_hpd *hpd)
  64{
  65        dal_hw_hpd_destruct(hpd);
  66}
  67
  68static 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        kfree(hpd);
  76
  77        *ptr = NULL;
  78}
  79
  80static 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
 103static 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
 119static 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
 129static void construct(
 130        struct hw_hpd *hpd,
 131        enum gpio_id id,
 132        uint32_t en,
 133        struct dc_context *ctx)
 134{
 135        dal_hw_hpd_construct(hpd, id, en, ctx);
 136        hpd->base.base.funcs = &funcs;
 137}
 138
 139struct hw_gpio_pin *dal_hw_hpd_create(
 140        struct dc_context *ctx,
 141        enum gpio_id id,
 142        uint32_t en)
 143{
 144        struct hw_hpd *hpd;
 145
 146        if (id != GPIO_ID_HPD) {
 147                ASSERT_CRITICAL(false);
 148                return NULL;
 149        }
 150
 151        if ((en < GPIO_HPD_MIN) || (en > GPIO_HPD_MAX)) {
 152                ASSERT_CRITICAL(false);
 153                return NULL;
 154        }
 155
 156        hpd = kzalloc(sizeof(struct hw_hpd), GFP_KERNEL);
 157        if (!hpd) {
 158                ASSERT_CRITICAL(false);
 159                return NULL;
 160        }
 161
 162        construct(hpd, id, en, ctx);
 163        return &hpd->base.base;
 164}
 165