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_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
  47struct gpio;
  48
  49static void dal_hw_hpd_destruct(
  50        struct hw_hpd *pin)
  51{
  52        dal_hw_gpio_destruct(&pin->base);
  53}
  54
  55static 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
  67static 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
  90static 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
 106static 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
 116static 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
 126void 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
 146struct 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}
 152