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_destruct(
50 	struct hw_hpd *pin)
51 {
52 	dal_hw_gpio_destruct(&pin->base);
53 }
54 
55 static void dal_hw_hpd_destroy(
56 	struct hw_gpio_pin **ptr)
57 {
58 	struct hw_hpd *hpd = HW_HPD_FROM_BASE(*ptr);
59 
60 	dal_hw_hpd_destruct(hpd);
61 
62 	kfree(hpd);
63 
64 	*ptr = NULL;
65 }
66 
67 static enum gpio_result get_value(
68 	const struct hw_gpio_pin *ptr,
69 	uint32_t *value)
70 {
71 	struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr);
72 	uint32_t hpd_delayed = 0;
73 
74 	/* in Interrupt mode we ask for SENSE bit */
75 
76 	if (ptr->mode == GPIO_MODE_INTERRUPT) {
77 
78 		REG_GET(int_status,
79 			DC_HPD_SENSE_DELAYED, &hpd_delayed);
80 
81 		*value = hpd_delayed;
82 		return GPIO_RESULT_OK;
83 	}
84 
85 	/* in any other modes, operate as normal GPIO */
86 
87 	return dal_hw_gpio_get_value(ptr, value);
88 }
89 
90 static enum gpio_result set_config(
91 	struct hw_gpio_pin *ptr,
92 	const struct gpio_config_data *config_data)
93 {
94 	struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr);
95 
96 	if (!config_data)
97 		return GPIO_RESULT_INVALID_DATA;
98 
99 	REG_UPDATE_2(toggle_filt_cntl,
100 		DC_HPD_CONNECT_INT_DELAY, config_data->config.hpd.delay_on_connect / 10,
101 		DC_HPD_DISCONNECT_INT_DELAY, config_data->config.hpd.delay_on_disconnect / 10);
102 
103 	return GPIO_RESULT_OK;
104 }
105 
106 static const struct hw_gpio_pin_funcs funcs = {
107 	.destroy = dal_hw_hpd_destroy,
108 	.open = dal_hw_gpio_open,
109 	.get_value = get_value,
110 	.set_value = dal_hw_gpio_set_value,
111 	.set_config = set_config,
112 	.change_mode = dal_hw_gpio_change_mode,
113 	.close = dal_hw_gpio_close,
114 };
115 
116 static void dal_hw_hpd_construct(
117 	struct hw_hpd *pin,
118 	enum gpio_id id,
119 	uint32_t en,
120 	struct dc_context *ctx)
121 {
122 	dal_hw_gpio_construct(&pin->base, id, en, ctx);
123 	pin->base.base.funcs = &funcs;
124 }
125 
126 void dal_hw_hpd_init(
127 	struct hw_hpd **hw_hpd,
128 	struct dc_context *ctx,
129 	enum gpio_id id,
130 	uint32_t en)
131 {
132 	if ((en < GPIO_DDC_LINE_MIN) || (en > GPIO_DDC_LINE_MAX)) {
133 		ASSERT_CRITICAL(false);
134 		*hw_hpd = NULL;
135 	}
136 
137 	*hw_hpd = kzalloc(sizeof(struct hw_hpd), GFP_KERNEL);
138 	if (!*hw_hpd) {
139 		ASSERT_CRITICAL(false);
140 		return;
141 	}
142 
143 	dal_hw_hpd_construct(*hw_hpd, id, en, ctx);
144 }
145 
146 struct hw_gpio_pin *dal_hw_hpd_get_pin(struct gpio *gpio)
147 {
148 	struct hw_hpd *hw_hpd = dal_gpio_get_hpd(gpio);
149 
150 	return &hw_hpd->base.base;
151 }
152