1/* $NetBSD: amdgpu_hw_hpd.c,v 1.3 2021/12/19 12:02:39 riastradh Exp $ */ 2 3/* 4 * Copyright 2012-15 Advanced Micro Devices, Inc. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 22 * OTHER DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: AMD 25 * 26 */ 27 28#include <sys/cdefs.h> 29__KERNEL_RCSID(0, "$NetBSD: amdgpu_hw_hpd.c,v 1.3 2021/12/19 12:02:39 riastradh Exp $"); 30 31#include <linux/slab.h> 32 33#include "dm_services.h" 34 35#include "include/gpio_interface.h" 36#include "include/gpio_types.h" 37#include "hw_gpio.h" 38#include "hw_hpd.h" 39 40#include "reg_helper.h" 41#include "hpd_regs.h" 42 43#undef FN 44#define FN(reg_name, field_name) \ 45 hpd->shifts->field_name, hpd->masks->field_name 46 47#define CTX \ 48 hpd->base.base.ctx 49#define REG(reg)\ 50 (hpd->regs->reg) 51 52struct gpio; 53 54static void dal_hw_hpd_destruct( 55 struct hw_hpd *pin) 56{ 57 dal_hw_gpio_destruct(&pin->base); 58} 59 60static void dal_hw_hpd_destroy( 61 struct hw_gpio_pin **ptr) 62{ 63 struct hw_hpd *hpd = HW_HPD_FROM_BASE(*ptr); 64 65 dal_hw_hpd_destruct(hpd); 66 67 kfree(hpd); 68 69 *ptr = NULL; 70} 71 72static enum gpio_result get_value( 73 const struct hw_gpio_pin *ptr, 74 uint32_t *value) 75{ 76 const struct hw_gpio *gpio = const_container_of(ptr, struct hw_gpio, base); 77 const struct hw_hpd *hpd = const_container_of(gpio, struct hw_hpd, base); 78 uint32_t hpd_delayed = 0; 79 80 /* in Interrupt mode we ask for SENSE bit */ 81 82 if (ptr->mode == GPIO_MODE_INTERRUPT) { 83 84 REG_GET(int_status, 85 DC_HPD_SENSE_DELAYED, &hpd_delayed); 86 87 *value = hpd_delayed; 88 return GPIO_RESULT_OK; 89 } 90 91 /* in any other modes, operate as normal GPIO */ 92 93 return dal_hw_gpio_get_value(ptr, value); 94} 95 96static enum gpio_result set_config( 97 struct hw_gpio_pin *ptr, 98 const struct gpio_config_data *config_data) 99{ 100 struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr); 101 102 if (!config_data) 103 return GPIO_RESULT_INVALID_DATA; 104 105 REG_UPDATE_2(toggle_filt_cntl, 106 DC_HPD_CONNECT_INT_DELAY, config_data->config.hpd.delay_on_connect / 10, 107 DC_HPD_DISCONNECT_INT_DELAY, config_data->config.hpd.delay_on_disconnect / 10); 108 109 return GPIO_RESULT_OK; 110} 111 112static const struct hw_gpio_pin_funcs funcs = { 113 .destroy = dal_hw_hpd_destroy, 114 .open = dal_hw_gpio_open, 115 .get_value = get_value, 116 .set_value = dal_hw_gpio_set_value, 117 .set_config = set_config, 118 .change_mode = dal_hw_gpio_change_mode, 119 .close = dal_hw_gpio_close, 120}; 121 122static void dal_hw_hpd_construct( 123 struct hw_hpd *pin, 124 enum gpio_id id, 125 uint32_t en, 126 struct dc_context *ctx) 127{ 128 dal_hw_gpio_construct(&pin->base, id, en, ctx); 129 pin->base.base.funcs = &funcs; 130} 131 132void dal_hw_hpd_init( 133 struct hw_hpd **hw_hpd, 134 struct dc_context *ctx, 135 enum gpio_id id, 136 uint32_t en) 137{ 138 if ((en < GPIO_DDC_LINE_MIN) || (en > GPIO_DDC_LINE_MAX)) { 139 ASSERT_CRITICAL(false); 140 *hw_hpd = NULL; 141 } 142 143 *hw_hpd = kzalloc(sizeof(struct hw_hpd), GFP_KERNEL); 144 if (!*hw_hpd) { 145 ASSERT_CRITICAL(false); 146 return; 147 } 148 149 dal_hw_hpd_construct(*hw_hpd, id, en, ctx); 150} 151 152struct hw_gpio_pin *dal_hw_hpd_get_pin(struct gpio *gpio) 153{ 154 struct hw_hpd *hw_hpd = dal_gpio_get_hpd(gpio); 155 156 return &hw_hpd->base.base; 157} 158