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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* AMD MP2 1.1 communication interfaces
*
* Copyright (c) 2022, Advanced Micro Devices, Inc.
* All Rights Reserved.
*
* Author: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
*/
#include <linux/amd-pmf-io.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/iopoll.h>
#include "amd_sfh_interface.h"
static struct amd_mp2_dev *emp2;
static int amd_sfh_wait_response(struct amd_mp2_dev *mp2, u8 sid, u32 cmd_id)
{
struct sfh_cmd_response cmd_resp;
/* Get response with status within a max of 10000 ms timeout */
if (!readl_poll_timeout(mp2->mmio + AMD_P2C_MSG(0), cmd_resp.resp,
(cmd_resp.response.response == 0 &&
cmd_resp.response.cmd_id == cmd_id && (sid == 0xff ||
cmd_resp.response.sensor_id == sid)), 500, 10000000))
return cmd_resp.response.response;
return -1;
}
static void amd_start_sensor(struct amd_mp2_dev *privdata, struct amd_mp2_sensor_info info)
{
struct sfh_cmd_base cmd_base;
cmd_base.ul = 0;
cmd_base.cmd.cmd_id = ENABLE_SENSOR;
cmd_base.cmd.intr_disable = 0;
cmd_base.cmd.sub_cmd_value = 1;
cmd_base.cmd.sensor_id = info.sensor_idx;
writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG(0));
}
static void amd_stop_sensor(struct amd_mp2_dev *privdata, u16 sensor_idx)
{
struct sfh_cmd_base cmd_base;
cmd_base.ul = 0;
cmd_base.cmd.cmd_id = DISABLE_SENSOR;
cmd_base.cmd.intr_disable = 0;
cmd_base.cmd.sub_cmd_value = 1;
cmd_base.cmd.sensor_id = sensor_idx;
writeq(0x0, privdata->mmio + AMD_C2P_MSG(1));
writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG(0));
}
static void amd_stop_all_sensor(struct amd_mp2_dev *privdata)
{
struct sfh_cmd_base cmd_base;
cmd_base.ul = 0;
cmd_base.cmd.cmd_id = DISABLE_SENSOR;
cmd_base.cmd.intr_disable = 0;
/* 0xf indicates all sensors */
cmd_base.cmd.sensor_id = 0xf;
writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG(0));
}
static struct amd_mp2_ops amd_sfh_ops = {
.start = amd_start_sensor,
.stop = amd_stop_sensor,
.stop_all = amd_stop_all_sensor,
.response = amd_sfh_wait_response,
};
void sfh_deinit_emp2(void)
{
emp2 = NULL;
}
void sfh_interface_init(struct amd_mp2_dev *mp2)
{
mp2->mp2_ops = &amd_sfh_ops;
emp2 = mp2;
}
static int amd_sfh_hpd_info(u8 *user_present)
{
struct hpd_status hpdstatus;
if (!user_present)
return -EINVAL;
if (!emp2 || !emp2->dev_en.is_hpd_present)
return -ENODEV;
hpdstatus.val = readl(emp2->mmio + AMD_C2P_MSG(4));
*user_present = hpdstatus.shpd.presence;
return 0;
}
int amd_get_sfh_info(struct amd_sfh_info *sfh_info, enum sfh_message_type op)
{
if (sfh_info) {
switch (op) {
case MT_HPD:
return amd_sfh_hpd_info(&sfh_info->user_present);
}
}
return -EINVAL;
}
EXPORT_SYMBOL_GPL(amd_get_sfh_info);
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