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/slab.h> 27 28 #include "dm_services.h" 29 30 #include "include/gpio_interface.h" 31 #include "include/gpio_types.h" 32 #include "hw_gpio.h" 33 #include "hw_hpd.h" 34 35 #include "reg_helper.h" 36 #include "hpd_regs.h" 37 38 #undef FN 39 #define FN(reg_name, field_name) \ 40 hpd->shifts->field_name, hpd->masks->field_name 41 42 #define CTX \ 43 hpd->base.base.ctx 44 #define REG(reg)\ 45 (hpd->regs->reg) 46 47 struct gpio; 48 49 static void dal_hw_hpd_construct( 50 struct hw_hpd *pin, 51 enum gpio_id id, 52 uint32_t en, 53 struct dc_context *ctx) 54 { 55 dal_hw_gpio_construct(&pin->base, id, en, ctx); 56 } 57 58 static void dal_hw_hpd_destruct( 59 struct hw_hpd *pin) 60 { 61 dal_hw_gpio_destruct(&pin->base); 62 } 63 64 65 static void destruct( 66 struct hw_hpd *hpd) 67 { 68 dal_hw_hpd_destruct(hpd); 69 } 70 71 static void destroy( 72 struct hw_gpio_pin **ptr) 73 { 74 struct hw_hpd *hpd = HW_HPD_FROM_BASE(*ptr); 75 76 destruct(hpd); 77 78 kfree(hpd); 79 80 *ptr = NULL; 81 } 82 83 static enum gpio_result get_value( 84 const struct hw_gpio_pin *ptr, 85 uint32_t *value) 86 { 87 struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr); 88 uint32_t hpd_delayed = 0; 89 90 /* in Interrupt mode we ask for SENSE bit */ 91 92 if (ptr->mode == GPIO_MODE_INTERRUPT) { 93 94 REG_GET(int_status, 95 DC_HPD_SENSE_DELAYED, &hpd_delayed); 96 97 *value = hpd_delayed; 98 return GPIO_RESULT_OK; 99 } 100 101 /* in any other modes, operate as normal GPIO */ 102 103 return dal_hw_gpio_get_value(ptr, value); 104 } 105 106 static enum gpio_result set_config( 107 struct hw_gpio_pin *ptr, 108 const struct gpio_config_data *config_data) 109 { 110 struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr); 111 112 if (!config_data) 113 return GPIO_RESULT_INVALID_DATA; 114 115 REG_UPDATE_2(toggle_filt_cntl, 116 DC_HPD_CONNECT_INT_DELAY, config_data->config.hpd.delay_on_connect / 10, 117 DC_HPD_DISCONNECT_INT_DELAY, config_data->config.hpd.delay_on_disconnect / 10); 118 119 return GPIO_RESULT_OK; 120 } 121 122 static const struct hw_gpio_pin_funcs funcs = { 123 .destroy = destroy, 124 .open = dal_hw_gpio_open, 125 .get_value = get_value, 126 .set_value = dal_hw_gpio_set_value, 127 .set_config = set_config, 128 .change_mode = dal_hw_gpio_change_mode, 129 .close = dal_hw_gpio_close, 130 }; 131 132 static void construct( 133 struct hw_hpd *hpd, 134 enum gpio_id id, 135 uint32_t en, 136 struct dc_context *ctx) 137 { 138 dal_hw_hpd_construct(hpd, id, en, ctx); 139 hpd->base.base.funcs = &funcs; 140 } 141 142 void dal_hw_hpd_init( 143 struct hw_hpd **hw_hpd, 144 struct dc_context *ctx, 145 enum gpio_id id, 146 uint32_t en) 147 { 148 if ((en < GPIO_DDC_LINE_MIN) || (en > GPIO_DDC_LINE_MAX)) { 149 ASSERT_CRITICAL(false); 150 *hw_hpd = NULL; 151 } 152 153 *hw_hpd = kzalloc(sizeof(struct hw_hpd), GFP_KERNEL); 154 if (!*hw_hpd) { 155 ASSERT_CRITICAL(false); 156 return; 157 } 158 159 construct(*hw_hpd, id, en, ctx); 160 } 161 162 struct hw_gpio_pin *dal_hw_hpd_get_pin(struct gpio *gpio) 163 { 164 struct hw_hpd *hw_hpd = dal_gpio_get_hpd(gpio); 165 166 return &hw_hpd->base.base; 167 } 168