4 files changed, 262 insertions, 0 deletions

diff --git a/drivers/hid/amd-sfh-hid/Kconfig b/drivers/hid/amd-sfh-hid/Kconfig
new file mode 100644
index 000000000000..db069a83e9a2
--- /dev/null
+++ b/drivers/hid/amd-sfh-hid/Kconfig
@@ -0,0 +1,18 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+menu "AMD SFH HID Support"
+	depends on X86_64 || COMPILE_TEST
+	depends on PCI
+	depends on HID
+
+config AMD_SFH_HID
+	tristate "AMD Sensor Fusion Hub"
+	help
+	  If you say yes to this option, support will be included for the
+	  AMD Sensor Fusion Hub.
+	  This driver will enable sensors functionality on AMD platforms
+	  starting from 17h family of RYZEN parts.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called amd-sfh.
+	  Say Y or M here if you want to support AMD SFH. If unsure, say N.
+endmenu
diff --git a/drivers/hid/amd-sfh-hid/Makefile b/drivers/hid/amd-sfh-hid/Makefile
new file mode 100644
index 000000000000..35e704da5612
--- /dev/null
+++ b/drivers/hid/amd-sfh-hid/Makefile
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# Makefile - AMD SFH HID drivers
+# Copyright (c) 2019-2020, Advanced Micro Devices, Inc.
+#
+#
+obj-$(CONFIG_AMD_SFH_HID) += amd_sfh.o
+amd_sfh-objs := amd_sfh_hid.o
+amd_sfh-objs += amd_sfh_client.o
+amd_sfh-objs += amd_sfh_pcie.o
+amd_sfh-objs += hid_descriptor/amd_sfh_hid_desc.o
+
+ccflags-y += -I $(srctree)/$(src)/
diff --git a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c
new file mode 100644
index 000000000000..9c5eb442e1a6
--- /dev/null
+++ b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c
@@ -0,0 +1,152 @@
+// 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(1)
+#define GYRO_EN		BIT(2)
+#define MAGNO_EN	BIT(3)
+#define ALS_EN		BIT(19)
+
+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.phys_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;
+
+	privdata->activecontrolstatus = readl(privdata->mmio + AMD_P2C_MSG3);
+	activestatus = privdata->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>");
diff --git a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.h b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.h
new file mode 100644
index 000000000000..e8be94f935b7
--- /dev/null
+++ b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.h
@@ -0,0 +1,79 @@
+/* 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>
+ */
+
+#ifndef PCIE_MP2_AMD_H
+#define PCIE_MP2_AMD_H
+
+#include <linux/pci.h>
+
+#define PCI_DEVICE_ID_AMD_MP2	0x15E4
+
+#define ENABLE_SENSOR		1
+#define DISABLE_SENSOR		2
+#define STOP_ALL_SENSORS	8
+
+/* MP2 C2P Message Registers */
+#define AMD_C2P_MSG0	0x10500
+#define AMD_C2P_MSG1	0x10504
+#define AMD_C2P_MSG2	0x10508
+
+/* MP2 P2C Message Registers */
+#define AMD_P2C_MSG3	0x1068C /* Supported Sensors info */
+
+/* SFH Command register */
+union sfh_cmd_base {
+	u32 ul;
+	struct {
+		u32 cmd_id : 8;
+		u32 sensor_id : 8;
+		u32 period : 16;
+	} s;
+};
+
+union sfh_cmd_param {
+	u32 ul;
+	struct {
+		u32 buf_layout : 2;
+		u32 buf_length : 6;
+		u32 rsvd : 24;
+	} s;
+};
+
+struct sfh_cmd_reg {
+	union sfh_cmd_base cmd_base;
+	union sfh_cmd_param cmd_param;
+	phys_addr_t phys_addr;
+};
+
+enum sensor_idx {
+	accel_idx = 0,
+	gyro_idx = 1,
+	mag_idx = 2,
+	als_idx = 19
+};
+
+struct amd_mp2_dev {
+	struct pci_dev *pdev;
+	struct amdtp_cl_data *cl_data;
+	void __iomem *mmio;
+	u32 activecontrolstatus;
+};
+
+struct amd_mp2_sensor_info {
+	u8 sensor_idx;
+	u32 period;
+	phys_addr_t phys_address;
+};
+
+void amd_start_sensor(struct amd_mp2_dev *privdata, struct amd_mp2_sensor_info info);
+void amd_stop_sensor(struct amd_mp2_dev *privdata, u16 sensor_idx);
+void amd_stop_all_sensors(struct amd_mp2_dev *privdata);
+int amd_mp2_get_sensor_num(struct amd_mp2_dev *privdata, u8 *sensor_id);
+int amd_sfh_hid_client_init(struct amd_mp2_dev *privdata);
+int amd_sfh_hid_client_deinit(struct amd_mp2_dev *privdata);
+#endif