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_ddc.h"
32
33#include "reg_helper.h"
34#include "gpio_regs.h"
35
36
37#undef FN
38#define FN(reg_name, field_name) \
39 ddc->shifts->field_name, ddc->masks->field_name
40
41#define CTX \
42 ddc->base.base.ctx
43#define REG(reg)\
44 (ddc->regs->reg)
45
46struct gpio;
47
48static void dal_hw_ddc_destruct(
49 struct hw_ddc *pin)
50{
51 dal_hw_gpio_destruct(pin: &pin->base);
52}
53
54static void dal_hw_ddc_destroy(
55 struct hw_gpio_pin **ptr)
56{
57 struct hw_ddc *pin = HW_DDC_FROM_BASE(*ptr);
58
59 dal_hw_ddc_destruct(pin);
60
61 kfree(objp: pin);
62
63 *ptr = NULL;
64}
65
66static enum gpio_result set_config(
67 struct hw_gpio_pin *ptr,
68 const struct gpio_config_data *config_data)
69{
70 struct hw_ddc *ddc = HW_DDC_FROM_BASE(ptr);
71 struct hw_gpio *hw_gpio = NULL;
72 uint32_t regval;
73 uint32_t ddc_data_pd_en = 0;
74 uint32_t ddc_clk_pd_en = 0;
75 uint32_t aux_pad_mode = 0;
76
77 hw_gpio = &ddc->base;
78
79 if (hw_gpio == NULL) {
80 ASSERT_CRITICAL(false);
81 return GPIO_RESULT_NULL_HANDLE;
82 }
83
84 regval = REG_GET_3(gpio.MASK_reg,
85 DC_GPIO_DDC1DATA_PD_EN, &ddc_data_pd_en,
86 DC_GPIO_DDC1CLK_PD_EN, &ddc_clk_pd_en,
87 AUX_PAD1_MODE, &aux_pad_mode);
88
89 switch (config_data->config.ddc.type) {
90 case GPIO_DDC_CONFIG_TYPE_MODE_I2C:
91 /* On plug-in, there is a transient level on the pad
92 * which must be discharged through the internal pull-down.
93 * Enable internal pull-down, 2.5msec discharge time
94 * is required for detection of AUX mode */
95 if (hw_gpio->base.en != GPIO_DDC_LINE_VIP_PAD) {
96 if (!ddc_data_pd_en || !ddc_clk_pd_en) {
97 if (hw_gpio->base.en == GPIO_DDC_LINE_DDC_VGA) {
98 // bit 4 of mask has different usage in some cases
99 REG_SET(gpio.MASK_reg, regval, DC_GPIO_DDC1DATA_PD_EN, 1);
100 } else {
101 REG_SET_2(gpio.MASK_reg, regval,
102 DC_GPIO_DDC1DATA_PD_EN, 1,
103 DC_GPIO_DDC1CLK_PD_EN, 1);
104 }
105 if (config_data->type ==
106 GPIO_CONFIG_TYPE_I2C_AUX_DUAL_MODE)
107 msleep(msecs: 3);
108 }
109 } else {
110 uint32_t sda_pd_dis = 0;
111 uint32_t scl_pd_dis = 0;
112
113 REG_GET_2(gpio.MASK_reg,
114 DC_GPIO_SDA_PD_DIS, &sda_pd_dis,
115 DC_GPIO_SCL_PD_DIS, &scl_pd_dis);
116
117 if (sda_pd_dis) {
118 REG_SET(gpio.MASK_reg, regval,
119 DC_GPIO_SDA_PD_DIS, 0);
120
121 if (config_data->type ==
122 GPIO_CONFIG_TYPE_I2C_AUX_DUAL_MODE)
123 msleep(msecs: 3);
124 }
125
126 if (!scl_pd_dis) {
127 REG_SET(gpio.MASK_reg, regval,
128 DC_GPIO_SCL_PD_DIS, 1);
129
130 if (config_data->type ==
131 GPIO_CONFIG_TYPE_I2C_AUX_DUAL_MODE)
132 msleep(msecs: 3);
133 }
134 }
135
136 if (aux_pad_mode) {
137 /* let pins to get de-asserted
138 * before setting pad to I2C mode */
139 if (config_data->config.ddc.data_en_bit_present ||
140 config_data->config.ddc.clock_en_bit_present)
141 /* [anaumov] in DAL2, there was
142 * dc_service_delay_in_microseconds(2000); */
143 msleep(msecs: 2);
144
145 /* set the I2C pad mode */
146 /* read the register again,
147 * some bits may have been changed */
148 REG_UPDATE(gpio.MASK_reg,
149 AUX_PAD1_MODE, 0);
150 }
151
152 if (ddc->regs->dc_gpio_aux_ctrl_5 != 0) {
153 REG_UPDATE(dc_gpio_aux_ctrl_5, DDC_PAD_I2CMODE, 1);
154 }
155 //set DC_IO_aux_rxsel = 2'b01
156 if (ddc->regs->phy_aux_cntl != 0) {
157 REG_UPDATE(phy_aux_cntl, AUX_PAD_RXSEL, 1);
158 }
159 return GPIO_RESULT_OK;
160 case GPIO_DDC_CONFIG_TYPE_MODE_AUX:
161 /* set the AUX pad mode */
162 if (!aux_pad_mode) {
163 REG_SET(gpio.MASK_reg, regval,
164 AUX_PAD1_MODE, 1);
165 }
166 if (ddc->regs->dc_gpio_aux_ctrl_5 != 0) {
167 REG_UPDATE(dc_gpio_aux_ctrl_5,
168 DDC_PAD_I2CMODE, 0);
169 }
170
171 return GPIO_RESULT_OK;
172 case GPIO_DDC_CONFIG_TYPE_POLL_FOR_CONNECT:
173 if ((hw_gpio->base.en >= GPIO_DDC_LINE_DDC1) &&
174 (hw_gpio->base.en <= GPIO_DDC_LINE_DDC_VGA)) {
175 REG_UPDATE_3(ddc_setup,
176 DC_I2C_DDC1_ENABLE, 1,
177 DC_I2C_DDC1_EDID_DETECT_ENABLE, 1,
178 DC_I2C_DDC1_EDID_DETECT_MODE, 0);
179 return GPIO_RESULT_OK;
180 }
181 break;
182 case GPIO_DDC_CONFIG_TYPE_POLL_FOR_DISCONNECT:
183 if ((hw_gpio->base.en >= GPIO_DDC_LINE_DDC1) &&
184 (hw_gpio->base.en <= GPIO_DDC_LINE_DDC_VGA)) {
185 REG_UPDATE_3(ddc_setup,
186 DC_I2C_DDC1_ENABLE, 1,
187 DC_I2C_DDC1_EDID_DETECT_ENABLE, 1,
188 DC_I2C_DDC1_EDID_DETECT_MODE, 1);
189 return GPIO_RESULT_OK;
190 }
191 break;
192 case GPIO_DDC_CONFIG_TYPE_DISABLE_POLLING:
193 if ((hw_gpio->base.en >= GPIO_DDC_LINE_DDC1) &&
194 (hw_gpio->base.en <= GPIO_DDC_LINE_DDC_VGA)) {
195 REG_UPDATE_2(ddc_setup,
196 DC_I2C_DDC1_ENABLE, 0,
197 DC_I2C_DDC1_EDID_DETECT_ENABLE, 0);
198 return GPIO_RESULT_OK;
199 }
200 break;
201 }
202
203 BREAK_TO_DEBUGGER();
204
205 return GPIO_RESULT_NON_SPECIFIC_ERROR;
206}
207
208static const struct hw_gpio_pin_funcs funcs = {
209 .destroy = dal_hw_ddc_destroy,
210 .open = dal_hw_gpio_open,
211 .get_value = dal_hw_gpio_get_value,
212 .set_value = dal_hw_gpio_set_value,
213 .set_config = set_config,
214 .change_mode = dal_hw_gpio_change_mode,
215 .close = dal_hw_gpio_close,
216};
217
218static void dal_hw_ddc_construct(
219 struct hw_ddc *ddc,
220 enum gpio_id id,
221 uint32_t en,
222 struct dc_context *ctx)
223{
224 dal_hw_gpio_construct(pin: &ddc->base, id, en, ctx);
225 ddc->base.base.funcs = &funcs;
226}
227
228void dal_hw_ddc_init(
229 struct hw_ddc **hw_ddc,
230 struct dc_context *ctx,
231 enum gpio_id id,
232 uint32_t en)
233{
234 if ((en < GPIO_DDC_LINE_MIN) || (en > GPIO_DDC_LINE_MAX)) {
235 ASSERT_CRITICAL(false);
236 *hw_ddc = NULL;
237 }
238
239 *hw_ddc = kzalloc(size: sizeof(struct hw_ddc), GFP_KERNEL);
240 if (!*hw_ddc) {
241 ASSERT_CRITICAL(false);
242 return;
243 }
244
245 dal_hw_ddc_construct(ddc: *hw_ddc, id, en, ctx);
246}
247
248struct hw_gpio_pin *dal_hw_ddc_get_pin(struct gpio *gpio)
249{
250 struct hw_ddc *hw_ddc = dal_gpio_get_ddc(gpio);
251
252 return &hw_ddc->base.base;
253}
254

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