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/delay.h>
27 #include <linux/slab.h>
28 
29 #include "dm_services.h"
30 
31 #include "include/gpio_interface.h"
32 #include "include/gpio_types.h"
33 #include "hw_gpio.h"
34 #include "hw_ddc.h"
35 
36 #include "reg_helper.h"
37 #include "gpio_regs.h"
38 
39 
40 #undef FN
41 #define FN(reg_name, field_name) \
42 	ddc->shifts->field_name, ddc->masks->field_name
43 
44 #define CTX \
45 	ddc->base.base.ctx
46 #define REG(reg)\
47 	(ddc->regs->reg)
48 
49 struct gpio;
50 
51 static void dal_hw_ddc_destruct(
52 	struct hw_ddc *pin)
53 {
54 	dal_hw_gpio_destruct(&pin->base);
55 }
56 
57 static void dal_hw_ddc_destroy(
58 	struct hw_gpio_pin **ptr)
59 {
60 	struct hw_ddc *pin = HW_DDC_FROM_BASE(*ptr);
61 
62 	dal_hw_ddc_destruct(pin);
63 
64 	kfree(pin);
65 
66 	*ptr = NULL;
67 }
68 
69 static enum gpio_result set_config(
70 	struct hw_gpio_pin *ptr,
71 	const struct gpio_config_data *config_data)
72 {
73 	struct hw_ddc *ddc = HW_DDC_FROM_BASE(ptr);
74 	struct hw_gpio *hw_gpio = NULL;
75 	uint32_t regval;
76 	uint32_t ddc_data_pd_en = 0;
77 	uint32_t ddc_clk_pd_en = 0;
78 	uint32_t aux_pad_mode = 0;
79 
80 	hw_gpio = &ddc->base;
81 
82 	if (hw_gpio == NULL) {
83 		ASSERT_CRITICAL(false);
84 		return GPIO_RESULT_NULL_HANDLE;
85 	}
86 
87 	regval = REG_GET_3(gpio.MASK_reg,
88 			DC_GPIO_DDC1DATA_PD_EN, &ddc_data_pd_en,
89 			DC_GPIO_DDC1CLK_PD_EN, &ddc_clk_pd_en,
90 			AUX_PAD1_MODE, &aux_pad_mode);
91 
92 	switch (config_data->config.ddc.type) {
93 	case GPIO_DDC_CONFIG_TYPE_MODE_I2C:
94 		/* On plug-in, there is a transient level on the pad
95 		 * which must be discharged through the internal pull-down.
96 		 * Enable internal pull-down, 2.5msec discharge time
97 		 * is required for detection of AUX mode */
98 		if (hw_gpio->base.en != GPIO_DDC_LINE_VIP_PAD) {
99 			if (!ddc_data_pd_en || !ddc_clk_pd_en) {
100 
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(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(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(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(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 
208 static 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 
218 static 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(&ddc->base, id, en, ctx);
225 	ddc->base.base.funcs = &funcs;
226 }
227 
228 void 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(sizeof(struct hw_ddc), GFP_KERNEL);
240 	if (!*hw_ddc) {
241 		ASSERT_CRITICAL(false);
242 		return;
243 	}
244 
245 	dal_hw_ddc_construct(*hw_ddc, id, en, ctx);
246 }
247 
248 struct 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