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_types.h"
 29#include "hw_gpio.h"
 30#include "hw_hpd.h"
 31
 32#include "reg_helper.h"
 33#include "hpd_regs.h"
 34
 35#undef FN
 36#define FN(reg_name, field_name) \
 37	hpd->shifts->field_name, hpd->masks->field_name
 38
 39#define CTX \
 40	hpd->base.base.ctx
 41#define REG(reg)\
 42	(hpd->regs->reg)
 43
 44static void dal_hw_hpd_construct(
 45	struct hw_hpd *pin,
 46	enum gpio_id id,
 47	uint32_t en,
 48	struct dc_context *ctx)
 49{
 50	dal_hw_gpio_construct(&pin->base, id, en, ctx);
 51}
 52
 53static void dal_hw_hpd_destruct(
 54	struct hw_hpd *pin)
 55{
 56	dal_hw_gpio_destruct(&pin->base);
 57}
 58
 59
 60static void destruct(
 61	struct hw_hpd *hpd)
 62{
 63	dal_hw_hpd_destruct(hpd);
 64}
 65
 66static void destroy(
 67	struct hw_gpio_pin **ptr)
 68{
 69	struct hw_hpd *hpd = HW_HPD_FROM_BASE(*ptr);
 70
 71	destruct(hpd);
 72
 73	kfree(hpd);
 74
 75	*ptr = NULL;
 76}
 77
 78static enum gpio_result get_value(
 79	const struct hw_gpio_pin *ptr,
 80	uint32_t *value)
 81{
 82	struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr);
 83	uint32_t hpd_delayed = 0;
 84
 85	/* in Interrupt mode we ask for SENSE bit */
 86
 87	if (ptr->mode == GPIO_MODE_INTERRUPT) {
 88
 89		REG_GET(int_status,
 90			DC_HPD_SENSE_DELAYED, &hpd_delayed);
 91
 92		*value = hpd_delayed;
 93		return GPIO_RESULT_OK;
 94	}
 95
 96	/* in any other modes, operate as normal GPIO */
 97
 98	return dal_hw_gpio_get_value(ptr, value);
 99}
100
101static enum gpio_result set_config(
102	struct hw_gpio_pin *ptr,
103	const struct gpio_config_data *config_data)
104{
105	struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr);
106
107	if (!config_data)
108		return GPIO_RESULT_INVALID_DATA;
109
110	REG_UPDATE_2(toggle_filt_cntl,
111		DC_HPD_CONNECT_INT_DELAY, config_data->config.hpd.delay_on_connect / 10,
112		DC_HPD_DISCONNECT_INT_DELAY, config_data->config.hpd.delay_on_disconnect / 10);
113
114	return GPIO_RESULT_OK;
115}
116
117static const struct hw_gpio_pin_funcs funcs = {
118	.destroy = destroy,
119	.open = dal_hw_gpio_open,
120	.get_value = get_value,
121	.set_value = dal_hw_gpio_set_value,
122	.set_config = set_config,
123	.change_mode = dal_hw_gpio_change_mode,
124	.close = dal_hw_gpio_close,
125};
126
127static void construct(
128	struct hw_hpd *hpd,
129	enum gpio_id id,
130	uint32_t en,
131	struct dc_context *ctx)
132{
133	dal_hw_hpd_construct(hpd, id, en, ctx);
134	hpd->base.base.funcs = &funcs;
135}
136
137struct hw_gpio_pin *dal_hw_hpd_create(
138	struct dc_context *ctx,
139	enum gpio_id id,
140	uint32_t en)
141{
142	struct hw_hpd *hpd;
143
144	if (id != GPIO_ID_HPD) {
145		ASSERT_CRITICAL(false);
146		return NULL;
147	}
148
149	if ((en < GPIO_HPD_MIN) || (en > GPIO_HPD_MAX)) {
150		ASSERT_CRITICAL(false);
151		return NULL;
152	}
153
154	hpd = kzalloc(sizeof(struct hw_hpd), GFP_KERNEL);
155	if (!hpd) {
156		ASSERT_CRITICAL(false);
157		return NULL;
158	}
159
160	construct(hpd, id, en, ctx);
161	return &hpd->base.base;
162}