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