1 /* $NetBSD: amdgpu_hw_hpd.c,v 1.3 2021/12/19 12:02:39 riastradh Exp $ */
2
3 /*
4 * Copyright 2012-15 Advanced Micro Devices, Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors: AMD
25 *
26 */
27
28 #include <sys/cdefs.h>
29 __KERNEL_RCSID(0, "$NetBSD: amdgpu_hw_hpd.c,v 1.3 2021/12/19 12:02:39 riastradh Exp $");
30
31 #include <linux/slab.h>
32
33 #include "dm_services.h"
34
35 #include "include/gpio_interface.h"
36 #include "include/gpio_types.h"
37 #include "hw_gpio.h"
38 #include "hw_hpd.h"
39
40 #include "reg_helper.h"
41 #include "hpd_regs.h"
42
43 #undef FN
44 #define FN(reg_name, field_name) \
45 hpd->shifts->field_name, hpd->masks->field_name
46
47 #define CTX \
48 hpd->base.base.ctx
49 #define REG(reg)\
50 (hpd->regs->reg)
51
52 struct gpio;
53
dal_hw_hpd_destruct(struct hw_hpd * pin)54 static void dal_hw_hpd_destruct(
55 struct hw_hpd *pin)
56 {
57 dal_hw_gpio_destruct(&pin->base);
58 }
59
dal_hw_hpd_destroy(struct hw_gpio_pin ** ptr)60 static void dal_hw_hpd_destroy(
61 struct hw_gpio_pin **ptr)
62 {
63 struct hw_hpd *hpd = HW_HPD_FROM_BASE(*ptr);
64
65 dal_hw_hpd_destruct(hpd);
66
67 kfree(hpd);
68
69 *ptr = NULL;
70 }
71
get_value(const struct hw_gpio_pin * ptr,uint32_t * value)72 static enum gpio_result get_value(
73 const struct hw_gpio_pin *ptr,
74 uint32_t *value)
75 {
76 const struct hw_gpio *gpio = const_container_of(ptr, struct hw_gpio, base);
77 const struct hw_hpd *hpd = const_container_of(gpio, struct hw_hpd, base);
78 uint32_t hpd_delayed = 0;
79
80 /* in Interrupt mode we ask for SENSE bit */
81
82 if (ptr->mode == GPIO_MODE_INTERRUPT) {
83
84 REG_GET(int_status,
85 DC_HPD_SENSE_DELAYED, &hpd_delayed);
86
87 *value = hpd_delayed;
88 return GPIO_RESULT_OK;
89 }
90
91 /* in any other modes, operate as normal GPIO */
92
93 return dal_hw_gpio_get_value(ptr, value);
94 }
95
set_config(struct hw_gpio_pin * ptr,const struct gpio_config_data * config_data)96 static enum gpio_result set_config(
97 struct hw_gpio_pin *ptr,
98 const struct gpio_config_data *config_data)
99 {
100 struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr);
101
102 if (!config_data)
103 return GPIO_RESULT_INVALID_DATA;
104
105 REG_UPDATE_2(toggle_filt_cntl,
106 DC_HPD_CONNECT_INT_DELAY, config_data->config.hpd.delay_on_connect / 10,
107 DC_HPD_DISCONNECT_INT_DELAY, config_data->config.hpd.delay_on_disconnect / 10);
108
109 return GPIO_RESULT_OK;
110 }
111
112 static const struct hw_gpio_pin_funcs funcs = {
113 .destroy = dal_hw_hpd_destroy,
114 .open = dal_hw_gpio_open,
115 .get_value = get_value,
116 .set_value = dal_hw_gpio_set_value,
117 .set_config = set_config,
118 .change_mode = dal_hw_gpio_change_mode,
119 .close = dal_hw_gpio_close,
120 };
121
dal_hw_hpd_construct(struct hw_hpd * pin,enum gpio_id id,uint32_t en,struct dc_context * ctx)122 static void dal_hw_hpd_construct(
123 struct hw_hpd *pin,
124 enum gpio_id id,
125 uint32_t en,
126 struct dc_context *ctx)
127 {
128 dal_hw_gpio_construct(&pin->base, id, en, ctx);
129 pin->base.base.funcs = &funcs;
130 }
131
dal_hw_hpd_init(struct hw_hpd ** hw_hpd,struct dc_context * ctx,enum gpio_id id,uint32_t en)132 void dal_hw_hpd_init(
133 struct hw_hpd **hw_hpd,
134 struct dc_context *ctx,
135 enum gpio_id id,
136 uint32_t en)
137 {
138 if ((en < GPIO_DDC_LINE_MIN) || (en > GPIO_DDC_LINE_MAX)) {
139 ASSERT_CRITICAL(false);
140 *hw_hpd = NULL;
141 }
142
143 *hw_hpd = kzalloc(sizeof(struct hw_hpd), GFP_KERNEL);
144 if (!*hw_hpd) {
145 ASSERT_CRITICAL(false);
146 return;
147 }
148
149 dal_hw_hpd_construct(*hw_hpd, id, en, ctx);
150 }
151
dal_hw_hpd_get_pin(struct gpio * gpio)152 struct hw_gpio_pin *dal_hw_hpd_get_pin(struct gpio *gpio)
153 {
154 struct hw_hpd *hw_hpd = dal_gpio_get_hpd(gpio);
155
156 return &hw_hpd->base.base;
157 }
158