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_destruct( 50 struct hw_hpd *pin) 51 { 52 dal_hw_gpio_destruct(&pin->base); 53 } 54 55 static void dal_hw_hpd_destroy( 56 struct hw_gpio_pin **ptr) 57 { 58 struct hw_hpd *hpd = HW_HPD_FROM_BASE(*ptr); 59 60 dal_hw_hpd_destruct(hpd); 61 62 kfree(hpd); 63 64 *ptr = NULL; 65 } 66 67 static enum gpio_result get_value( 68 const struct hw_gpio_pin *ptr, 69 uint32_t *value) 70 { 71 struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr); 72 uint32_t hpd_delayed = 0; 73 74 /* in Interrupt mode we ask for SENSE bit */ 75 76 if (ptr->mode == GPIO_MODE_INTERRUPT) { 77 78 REG_GET(int_status, 79 DC_HPD_SENSE_DELAYED, &hpd_delayed); 80 81 *value = hpd_delayed; 82 return GPIO_RESULT_OK; 83 } 84 85 /* in any other modes, operate as normal GPIO */ 86 87 return dal_hw_gpio_get_value(ptr, value); 88 } 89 90 static enum gpio_result set_config( 91 struct hw_gpio_pin *ptr, 92 const struct gpio_config_data *config_data) 93 { 94 struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr); 95 96 if (!config_data) 97 return GPIO_RESULT_INVALID_DATA; 98 99 REG_UPDATE_2(toggle_filt_cntl, 100 DC_HPD_CONNECT_INT_DELAY, config_data->config.hpd.delay_on_connect / 10, 101 DC_HPD_DISCONNECT_INT_DELAY, config_data->config.hpd.delay_on_disconnect / 10); 102 103 return GPIO_RESULT_OK; 104 } 105 106 static const struct hw_gpio_pin_funcs funcs = { 107 .destroy = dal_hw_hpd_destroy, 108 .open = dal_hw_gpio_open, 109 .get_value = get_value, 110 .set_value = dal_hw_gpio_set_value, 111 .set_config = set_config, 112 .change_mode = dal_hw_gpio_change_mode, 113 .close = dal_hw_gpio_close, 114 }; 115 116 static void dal_hw_hpd_construct( 117 struct hw_hpd *pin, 118 enum gpio_id id, 119 uint32_t en, 120 struct dc_context *ctx) 121 { 122 dal_hw_gpio_construct(&pin->base, id, en, ctx); 123 pin->base.base.funcs = &funcs; 124 } 125 126 void dal_hw_hpd_init( 127 struct hw_hpd **hw_hpd, 128 struct dc_context *ctx, 129 enum gpio_id id, 130 uint32_t en) 131 { 132 if ((en < GPIO_DDC_LINE_MIN) || (en > GPIO_DDC_LINE_MAX)) { 133 ASSERT_CRITICAL(false); 134 *hw_hpd = NULL; 135 } 136 137 *hw_hpd = kzalloc(sizeof(struct hw_hpd), GFP_KERNEL); 138 if (!*hw_hpd) { 139 ASSERT_CRITICAL(false); 140 return; 141 } 142 143 dal_hw_hpd_construct(*hw_hpd, id, en, ctx); 144 } 145 146 struct hw_gpio_pin *dal_hw_hpd_get_pin(struct gpio *gpio) 147 { 148 struct hw_hpd *hw_hpd = dal_gpio_get_hpd(gpio); 149 150 return &hw_hpd->base.base; 151 } 152