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_generic.h"
  34
  35#include "reg_helper.h"
  36#include "generic_regs.h"
  37
  38#undef FN
  39#define FN(reg_name, field_name) \
  40        generic->shifts->field_name, generic->masks->field_name
  41
  42#define CTX \
  43        generic->base.base.ctx
  44#define REG(reg)\
  45        (generic->regs->reg)
  46
  47struct gpio;
  48
  49static void dal_hw_generic_destruct(
  50        struct hw_generic *pin)
  51{
  52        dal_hw_gpio_destruct(&pin->base);
  53}
  54
  55static void dal_hw_generic_destroy(
  56        struct hw_gpio_pin **ptr)
  57{
  58        struct hw_generic *generic = HW_GENERIC_FROM_BASE(*ptr);
  59
  60        dal_hw_generic_destruct(generic);
  61
  62        kfree(generic);
  63
  64        *ptr = NULL;
  65}
  66
  67static enum gpio_result set_config(
  68        struct hw_gpio_pin *ptr,
  69        const struct gpio_config_data *config_data)
  70{
  71        struct hw_generic *generic = HW_GENERIC_FROM_BASE(ptr);
  72
  73        if (!config_data)
  74                return GPIO_RESULT_INVALID_DATA;
  75
  76        REG_UPDATE_2(mux,
  77                GENERIC_EN, config_data->config.generic_mux.enable_output_from_mux,
  78                GENERIC_SEL, config_data->config.generic_mux.mux_select);
  79
  80        return GPIO_RESULT_OK;
  81}
  82
  83static const struct hw_gpio_pin_funcs funcs = {
  84        .destroy = dal_hw_generic_destroy,
  85        .open = dal_hw_gpio_open,
  86        .get_value = dal_hw_gpio_get_value,
  87        .set_value = dal_hw_gpio_set_value,
  88        .set_config = set_config,
  89        .change_mode = dal_hw_gpio_change_mode,
  90        .close = dal_hw_gpio_close,
  91};
  92
  93static void dal_hw_generic_construct(
  94        struct hw_generic *pin,
  95        enum gpio_id id,
  96        uint32_t en,
  97        struct dc_context *ctx)
  98{
  99        dal_hw_gpio_construct(&pin->base, id, en, ctx);
 100        pin->base.base.funcs = &funcs;
 101}
 102
 103void dal_hw_generic_init(
 104        struct hw_generic **hw_generic,
 105        struct dc_context *ctx,
 106        enum gpio_id id,
 107        uint32_t en)
 108{
 109        if ((en < GPIO_DDC_LINE_MIN) || (en > GPIO_DDC_LINE_MAX)) {
 110                ASSERT_CRITICAL(false);
 111                *hw_generic = NULL;
 112        }
 113
 114        *hw_generic = kzalloc(sizeof(struct hw_generic), GFP_KERNEL);
 115        if (!*hw_generic) {
 116                ASSERT_CRITICAL(false);
 117                return;
 118        }
 119
 120        dal_hw_generic_construct(*hw_generic, id, en, ctx);
 121}
 122
 123
 124struct hw_gpio_pin *dal_hw_generic_get_pin(struct gpio *gpio)
 125{
 126        struct hw_generic *hw_generic = dal_gpio_get_generic(gpio);
 127
 128        return &hw_generic->base.base;
 129}
 130