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
45struct gpio;
46
47static void dal_hw_hpd_destruct(
48 struct hw_hpd *pin)
49{
50 dal_hw_gpio_destruct(pin: &pin->base);
51}
52
53static 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(pin: hpd);
59
60 kfree(objp: hpd);
61
62 *ptr = NULL;
63}
64
65static 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(pin: ptr, value);
86}
87
88static 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
104static 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
114static 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: &pin->base, id, en, ctx);
121 pin->base.base.funcs = &funcs;
122}
123
124void 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(size: sizeof(struct hw_hpd), GFP_KERNEL);
136 if (!*hw_hpd) {
137 ASSERT_CRITICAL(false);
138 return;
139 }
140
141 dal_hw_hpd_construct(pin: *hw_hpd, id, en, ctx);
142}
143
144struct 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

source code of linux/drivers/gpu/drm/amd/display/dc/gpio/hw_hpd.c