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