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
dal_hw_hpd_destruct(struct hw_hpd * pin)47 static void dal_hw_hpd_destruct(
48 struct hw_hpd *pin)
49 {
50 dal_hw_gpio_destruct(&pin->base);
51 }
52
dal_hw_hpd_destroy(struct hw_gpio_pin ** ptr)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
get_value(const struct hw_gpio_pin * ptr,uint32_t * value)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
set_config(struct hw_gpio_pin * ptr,const struct gpio_config_data * config_data)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
dal_hw_hpd_construct(struct hw_hpd * pin,enum gpio_id id,uint32_t en,struct dc_context * ctx)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
dal_hw_hpd_init(struct hw_hpd ** hw_hpd,struct dc_context * ctx,enum gpio_id id,uint32_t en)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_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
dal_hw_hpd_get_pin(struct gpio * gpio)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