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      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 
     52 struct gpio;
     53 
     54 static void dal_hw_hpd_destruct(
     55 	struct hw_hpd *pin)
     56 {
     57 	dal_hw_gpio_destruct(&pin->base);
     58 }
     59 
     60 static 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 
     72 static 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 
     96 static 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 
    112 static 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 
    122 static 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 
    132 void 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 
    152 struct 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