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
dal_hw_hpd_construct(struct hw_hpd * pin,enum gpio_id id,uint32_t en,struct dc_context * ctx)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
dal_hw_hpd_destruct(struct hw_hpd * pin)58 static void dal_hw_hpd_destruct(
59 struct hw_hpd *pin)
60 {
61 dal_hw_gpio_destruct(&pin->base);
62 }
63
64
destruct(struct hw_hpd * hpd)65 static void destruct(
66 struct hw_hpd *hpd)
67 {
68 dal_hw_hpd_destruct(hpd);
69 }
70
destroy(struct hw_gpio_pin ** ptr)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
get_value(const struct hw_gpio_pin * ptr,uint32_t * value)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
set_config(struct hw_gpio_pin * ptr,const struct gpio_config_data * config_data)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
construct(struct hw_hpd * hpd,enum gpio_id id,uint32_t en,struct dc_context * ctx)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
dal_hw_hpd_init(struct hw_hpd ** hw_hpd,struct dc_context * ctx,enum gpio_id id,uint32_t en)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
dal_hw_hpd_get_pin(struct gpio * gpio)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
