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_hpd.h"
34 
35 #include "reg_helper.h"
36 #include "hpd_regs.h"
37 
38 #undef FN
39 #define FN(reg_name, field_name) \
40 	hpd->shifts->field_name, hpd->masks->field_name
41 
42 #define CTX \
43 	hpd->base.base.ctx
44 #define REG(reg)\
45 	(hpd->regs->reg)
46 
47 struct gpio;
48 
49 static void dal_hw_hpd_construct(
50 	struct hw_hpd *pin,
51 	enum gpio_id id,
52 	uint32_t en,
53 	struct dc_context *ctx)
54 {
55 	dal_hw_gpio_construct(&pin->base, id, en, ctx);
56 }
57 
58 static void dal_hw_hpd_destruct(
59 	struct hw_hpd *pin)
60 {
61 	dal_hw_gpio_destruct(&pin->base);
62 }
63 
64 
65 static void destruct(
66 	struct hw_hpd *hpd)
67 {
68 	dal_hw_hpd_destruct(hpd);
69 }
70 
71 static void destroy(
72 	struct hw_gpio_pin **ptr)
73 {
74 	struct hw_hpd *hpd = HW_HPD_FROM_BASE(*ptr);
75 
76 	destruct(hpd);
77 
78 	kfree(hpd);
79 
80 	*ptr = NULL;
81 }
82 
83 static enum gpio_result get_value(
84 	const struct hw_gpio_pin *ptr,
85 	uint32_t *value)
86 {
87 	struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr);
88 	uint32_t hpd_delayed = 0;
89 
90 	/* in Interrupt mode we ask for SENSE bit */
91 
92 	if (ptr->mode == GPIO_MODE_INTERRUPT) {
93 
94 		REG_GET(int_status,
95 			DC_HPD_SENSE_DELAYED, &hpd_delayed);
96 
97 		*value = hpd_delayed;
98 		return GPIO_RESULT_OK;
99 	}
100 
101 	/* in any other modes, operate as normal GPIO */
102 
103 	return dal_hw_gpio_get_value(ptr, value);
104 }
105 
106 static enum gpio_result set_config(
107 	struct hw_gpio_pin *ptr,
108 	const struct gpio_config_data *config_data)
109 {
110 	struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr);
111 
112 	if (!config_data)
113 		return GPIO_RESULT_INVALID_DATA;
114 
115 	REG_UPDATE_2(toggle_filt_cntl,
116 		DC_HPD_CONNECT_INT_DELAY, config_data->config.hpd.delay_on_connect / 10,
117 		DC_HPD_DISCONNECT_INT_DELAY, config_data->config.hpd.delay_on_disconnect / 10);
118 
119 	return GPIO_RESULT_OK;
120 }
121 
122 static const struct hw_gpio_pin_funcs funcs = {
123 	.destroy = destroy,
124 	.open = dal_hw_gpio_open,
125 	.get_value = get_value,
126 	.set_value = dal_hw_gpio_set_value,
127 	.set_config = set_config,
128 	.change_mode = dal_hw_gpio_change_mode,
129 	.close = dal_hw_gpio_close,
130 };
131 
132 static void construct(
133 	struct hw_hpd *hpd,
134 	enum gpio_id id,
135 	uint32_t en,
136 	struct dc_context *ctx)
137 {
138 	dal_hw_hpd_construct(hpd, id, en, ctx);
139 	hpd->base.base.funcs = &funcs;
140 }
141 
142 void dal_hw_hpd_init(
143 	struct hw_hpd **hw_hpd,
144 	struct dc_context *ctx,
145 	enum gpio_id id,
146 	uint32_t en)
147 {
148 	if ((en < GPIO_DDC_LINE_MIN) || (en > GPIO_DDC_LINE_MAX)) {
149 		ASSERT_CRITICAL(false);
150 		*hw_hpd = NULL;
151 	}
152 
153 	*hw_hpd = kzalloc(sizeof(struct hw_hpd), GFP_KERNEL);
154 	if (!*hw_hpd) {
155 		ASSERT_CRITICAL(false);
156 		return;
157 	}
158 
159 	construct(*hw_hpd, id, en, ctx);
160 }
161 
162 struct hw_gpio_pin *dal_hw_hpd_get_pin(struct gpio *gpio)
163 {
164 	struct hw_hpd *hw_hpd = dal_gpio_get_hpd(gpio);
165 
166 	return &hw_hpd->base.base;
167 }
168