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 | #include "include/gpio_types.h" |
28 | #include "hw_gpio.h" |
29 | |
30 | #include "reg_helper.h" |
31 | #include "gpio_regs.h" |
32 | |
33 | #undef FN |
34 | #define FN(reg_name, field_name) \ |
35 | gpio->regs->field_name ## _shift, gpio->regs->field_name ## _mask |
36 | |
37 | #define CTX \ |
38 | gpio->base.ctx |
39 | #define REG(reg)\ |
40 | (gpio->regs->reg) |
41 | |
42 | static void store_registers( |
43 | struct hw_gpio *gpio) |
44 | { |
45 | REG_GET(MASK_reg, MASK, &gpio->store.mask); |
46 | REG_GET(A_reg, A, &gpio->store.a); |
47 | REG_GET(EN_reg, EN, &gpio->store.en); |
48 | /* TODO store GPIO_MUX_CONTROL if we ever use it */ |
49 | } |
50 | |
51 | static void restore_registers( |
52 | struct hw_gpio *gpio) |
53 | { |
54 | REG_UPDATE(MASK_reg, MASK, gpio->store.mask); |
55 | REG_UPDATE(A_reg, A, gpio->store.a); |
56 | REG_UPDATE(EN_reg, EN, gpio->store.en); |
57 | /* TODO restore GPIO_MUX_CONTROL if we ever use it */ |
58 | } |
59 | |
60 | bool dal_hw_gpio_open( |
61 | struct hw_gpio_pin *ptr, |
62 | enum gpio_mode mode) |
63 | { |
64 | struct hw_gpio *pin = FROM_HW_GPIO_PIN(ptr); |
65 | |
66 | store_registers(gpio: pin); |
67 | |
68 | ptr->opened = (dal_hw_gpio_config_mode(pin, mode) == GPIO_RESULT_OK); |
69 | |
70 | return ptr->opened; |
71 | } |
72 | |
73 | enum gpio_result dal_hw_gpio_get_value( |
74 | const struct hw_gpio_pin *ptr, |
75 | uint32_t *value) |
76 | { |
77 | const struct hw_gpio *gpio = FROM_HW_GPIO_PIN(ptr); |
78 | |
79 | enum gpio_result result = GPIO_RESULT_OK; |
80 | |
81 | switch (ptr->mode) { |
82 | case GPIO_MODE_INPUT: |
83 | case GPIO_MODE_OUTPUT: |
84 | case GPIO_MODE_HARDWARE: |
85 | case GPIO_MODE_FAST_OUTPUT: |
86 | REG_GET(Y_reg, Y, value); |
87 | break; |
88 | default: |
89 | result = GPIO_RESULT_NON_SPECIFIC_ERROR; |
90 | } |
91 | |
92 | return result; |
93 | } |
94 | |
95 | enum gpio_result dal_hw_gpio_set_value( |
96 | const struct hw_gpio_pin *ptr, |
97 | uint32_t value) |
98 | { |
99 | struct hw_gpio *gpio = FROM_HW_GPIO_PIN(ptr); |
100 | |
101 | /* This is the public interface |
102 | * where the input comes from client, not shifted yet |
103 | * (because client does not know the shifts). */ |
104 | |
105 | switch (ptr->mode) { |
106 | case GPIO_MODE_OUTPUT: |
107 | REG_UPDATE(A_reg, A, value); |
108 | return GPIO_RESULT_OK; |
109 | case GPIO_MODE_FAST_OUTPUT: |
110 | /* We use (EN) to faster switch (used in DDC GPIO). |
111 | * So (A) is grounded, output is driven by (EN = 0) |
112 | * to pull the line down (output == 0) and (EN=1) |
113 | * then output is tri-state */ |
114 | REG_UPDATE(EN_reg, EN, ~value); |
115 | return GPIO_RESULT_OK; |
116 | default: |
117 | return GPIO_RESULT_NON_SPECIFIC_ERROR; |
118 | } |
119 | } |
120 | |
121 | enum gpio_result dal_hw_gpio_change_mode( |
122 | struct hw_gpio_pin *ptr, |
123 | enum gpio_mode mode) |
124 | { |
125 | struct hw_gpio *pin = FROM_HW_GPIO_PIN(ptr); |
126 | |
127 | return dal_hw_gpio_config_mode(pin, mode); |
128 | } |
129 | |
130 | void dal_hw_gpio_close( |
131 | struct hw_gpio_pin *ptr) |
132 | { |
133 | struct hw_gpio *pin = FROM_HW_GPIO_PIN(ptr); |
134 | |
135 | restore_registers(gpio: pin); |
136 | |
137 | ptr->mode = GPIO_MODE_UNKNOWN; |
138 | ptr->opened = false; |
139 | } |
140 | |
141 | enum gpio_result dal_hw_gpio_config_mode( |
142 | struct hw_gpio *gpio, |
143 | enum gpio_mode mode) |
144 | { |
145 | gpio->base.mode = mode; |
146 | |
147 | switch (mode) { |
148 | case GPIO_MODE_INPUT: |
149 | /* turn off output enable, act as input pin; |
150 | * program the pin as GPIO, mask out signal driven by HW */ |
151 | REG_UPDATE(EN_reg, EN, 0); |
152 | REG_UPDATE(MASK_reg, MASK, 1); |
153 | return GPIO_RESULT_OK; |
154 | case GPIO_MODE_OUTPUT: |
155 | /* turn on output enable, act as output pin; |
156 | * program the pin as GPIO, mask out signal driven by HW */ |
157 | REG_UPDATE(A_reg, A, 0); |
158 | REG_UPDATE(MASK_reg, MASK, 1); |
159 | return GPIO_RESULT_OK; |
160 | case GPIO_MODE_FAST_OUTPUT: |
161 | /* grounding the A register then use the EN register bit |
162 | * will have faster effect on the rise time */ |
163 | REG_UPDATE(A_reg, A, 0); |
164 | REG_UPDATE(MASK_reg, MASK, 1); |
165 | return GPIO_RESULT_OK; |
166 | case GPIO_MODE_HARDWARE: |
167 | /* program the pin as tri-state, pin is driven by HW */ |
168 | REG_UPDATE(MASK_reg, MASK, 0); |
169 | return GPIO_RESULT_OK; |
170 | case GPIO_MODE_INTERRUPT: |
171 | /* Interrupt mode supported only by HPD (IrqGpio) pins. */ |
172 | REG_UPDATE(MASK_reg, MASK, 0); |
173 | return GPIO_RESULT_OK; |
174 | default: |
175 | return GPIO_RESULT_NON_SPECIFIC_ERROR; |
176 | } |
177 | } |
178 | |
179 | void dal_hw_gpio_construct( |
180 | struct hw_gpio *pin, |
181 | enum gpio_id id, |
182 | uint32_t en, |
183 | struct dc_context *ctx) |
184 | { |
185 | pin->base.ctx = ctx; |
186 | pin->base.id = id; |
187 | pin->base.en = en; |
188 | pin->base.mode = GPIO_MODE_UNKNOWN; |
189 | pin->base.opened = false; |
190 | |
191 | pin->store.mask = 0; |
192 | pin->store.a = 0; |
193 | pin->store.en = 0; |
194 | pin->store.mux = 0; |
195 | |
196 | pin->mux_supported = false; |
197 | } |
198 | |
199 | void dal_hw_gpio_destruct( |
200 | struct hw_gpio *pin) |
201 | { |
202 | ASSERT(!pin->base.opened); |
203 | } |
204 | |