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 
45 struct gpio;
46 
47 static void dal_hw_hpd_destruct(
48 	struct hw_hpd *pin)
49 {
50 	dal_hw_gpio_destruct(&pin->base);
51 }
52 
53 static 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 
65 static 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 
88 static 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 
104 static 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 
114 static 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 
124 void 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 
144 struct 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 }
150