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 
44 static 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 
53 static void dal_hw_hpd_destruct(
54 	struct hw_hpd *pin)
55 {
56 	dal_hw_gpio_destruct(&pin->base);
57 }
58 
59 
60 static void destruct(
61 	struct hw_hpd *hpd)
62 {
63 	dal_hw_hpd_destruct(hpd);
64 }
65 
66 static 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 
78 static 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 
101 static 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 
117 static 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 
127 static 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 
137 struct 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 }
163