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