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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* AMD MP2 PCIe communication driver
* Copyright 2020 Advanced Micro Devices, Inc.
*
* Authors: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
* Sandeep Singh <Sandeep.singh@amd.com>
*/
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/module.h>
#include <linux/slab.h>
#include "amd_sfh_pcie.h"
#define DRIVER_NAME "pcie_mp2_amd"
#define DRIVER_DESC "AMD(R) PCIe MP2 Communication Driver"
#define ACEL_EN BIT(0)
#define GYRO_EN BIT(1)
#define MAGNO_EN BIT(2)
#define ALS_EN BIT(19)
static int sensor_mask_override = -1;
module_param_named(sensor_mask, sensor_mask_override, int, 0444);
MODULE_PARM_DESC(sensor_mask, "override the detected sensors mask");
void amd_start_sensor(struct amd_mp2_dev *privdata, struct amd_mp2_sensor_info info)
{
union sfh_cmd_param cmd_param;
union sfh_cmd_base cmd_base;
/* fill up command register */
memset(&cmd_base, 0, sizeof(cmd_base));
cmd_base.s.cmd_id = ENABLE_SENSOR;
cmd_base.s.period = info.period;
cmd_base.s.sensor_id = info.sensor_idx;
/* fill up command param register */
memset(&cmd_param, 0, sizeof(cmd_param));
cmd_param.s.buf_layout = 1;
cmd_param.s.buf_length = 16;
writeq(info.dma_address, privdata->mmio + AMD_C2P_MSG2);
writel(cmd_param.ul, privdata->mmio + AMD_C2P_MSG1);
writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG0);
}
void amd_stop_sensor(struct amd_mp2_dev *privdata, u16 sensor_idx)
{
union sfh_cmd_base cmd_base;
/* fill up command register */
memset(&cmd_base, 0, sizeof(cmd_base));
cmd_base.s.cmd_id = DISABLE_SENSOR;
cmd_base.s.period = 0;
cmd_base.s.sensor_id = sensor_idx;
writeq(0x0, privdata->mmio + AMD_C2P_MSG2);
writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG0);
}
void amd_stop_all_sensors(struct amd_mp2_dev *privdata)
{
union sfh_cmd_base cmd_base;
/* fill up command register */
memset(&cmd_base, 0, sizeof(cmd_base));
cmd_base.s.cmd_id = STOP_ALL_SENSORS;
cmd_base.s.period = 0;
cmd_base.s.sensor_id = 0;
writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG0);
}
int amd_mp2_get_sensor_num(struct amd_mp2_dev *privdata, u8 *sensor_id)
{
int activestatus, num_of_sensors = 0;
u32 activecontrolstatus;
if (sensor_mask_override >= 0) {
activestatus = sensor_mask_override;
} else {
activecontrolstatus = readl(privdata->mmio + AMD_P2C_MSG3);
activestatus = activecontrolstatus >> 4;
}
if (ACEL_EN & activestatus)
sensor_id[num_of_sensors++] = accel_idx;
if (GYRO_EN & activestatus)
sensor_id[num_of_sensors++] = gyro_idx;
if (MAGNO_EN & activestatus)
sensor_id[num_of_sensors++] = mag_idx;
if (ALS_EN & activestatus)
sensor_id[num_of_sensors++] = als_idx;
return num_of_sensors;
}
static void amd_mp2_pci_remove(void *privdata)
{
amd_sfh_hid_client_deinit(privdata);
amd_stop_all_sensors(privdata);
}
static int amd_mp2_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct amd_mp2_dev *privdata;
int rc;
privdata = devm_kzalloc(&pdev->dev, sizeof(*privdata), GFP_KERNEL);
if (!privdata)
return -ENOMEM;
privdata->pdev = pdev;
pci_set_drvdata(pdev, privdata);
rc = pcim_enable_device(pdev);
if (rc)
return rc;
rc = pcim_iomap_regions(pdev, BIT(2), DRIVER_NAME);
if (rc)
return rc;
privdata->mmio = pcim_iomap_table(pdev)[2];
pci_set_master(pdev);
rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
if (rc) {
rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
return rc;
}
rc = devm_add_action_or_reset(&pdev->dev, amd_mp2_pci_remove, privdata);
if (rc)
return rc;
return amd_sfh_hid_client_init(privdata);
}
static const struct pci_device_id amd_mp2_pci_tbl[] = {
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_MP2) },
{ }
};
MODULE_DEVICE_TABLE(pci, amd_mp2_pci_tbl);
static struct pci_driver amd_mp2_pci_driver = {
.name = DRIVER_NAME,
.id_table = amd_mp2_pci_tbl,
.probe = amd_mp2_pci_probe,
};
module_pci_driver(amd_mp2_pci_driver);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Shyam Sundar S K <Shyam-sundar.S-k@amd.com>");
MODULE_AUTHOR("Sandeep Singh <Sandeep.singh@amd.com>");
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