cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

hw_hpd.c (3681B)

      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
     47struct gpio;
     48
     49static void dal_hw_hpd_destruct(
     50	struct hw_hpd *pin)
     51{
     52	dal_hw_gpio_destruct(&pin->base);
     53}
     54
     55static 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
     67static 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
     90static 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
    106static 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
    116static 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
    126void 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
    146struct 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}