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From:   Huisong Li <lihuisong@huawei.com>
To:     <xuwei5@hisilicon.com>, <arnd@arndb.de>, <krzk@kernel.org>,
        <sudeep.holla@arm.com>, <rdunlap@infradead.org>
CC:     <linux-kernel@vger.kernel.org>, <soc@kernel.org>,
        <linux-arm-kernel@lists.infradead.org>, <wanghuiqiang@huawei.com>,
        <tanxiaofei@huawei.com>, <liuyonglong@huawei.com>,
        <lihuisong@huawei.com>
Subject: [PATCH v6 1/2] soc: hisilicon: Support HCCS driver on Kunpeng SoC
Date:   Tue, 1 Aug 2023 10:41:18 +0800
Message-ID: <20230801024119.37215-2-lihuisong@huawei.com>
In-Reply-To: <20230801024119.37215-1-lihuisong@huawei.com>
References: <20230424073020.4039-1-lihuisong@huawei.com>
 <20230801024119.37215-1-lihuisong@huawei.com>
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Precedence: bulk

The Huawei Cache Coherence System (HCCS) is a multi-chip interconnection
bus protocol. The performance of the application may be affected if some
HCCS ports on platform are not in full lane status, have a large number
of CRC errors and so on.

This driver provides the query interface of the health status and
port information of HCCS on Kunpeng SoC.

Signed-off-by: Huisong Li <lihuisong@huawei.com>
---
 MAINTAINERS                          |    6 +
 drivers/soc/Kconfig                  |    1 +
 drivers/soc/Makefile                 |    1 +
 drivers/soc/hisilicon/Kconfig        |   20 +
 drivers/soc/hisilicon/Makefile       |    2 +
 drivers/soc/hisilicon/kunpeng_hccs.c | 1282 ++++++++++++++++++++++++++
 drivers/soc/hisilicon/kunpeng_hccs.h |  196 ++++
 7 files changed, 1508 insertions(+)
 create mode 100644 drivers/soc/hisilicon/Kconfig
 create mode 100644 drivers/soc/hisilicon/Makefile
 create mode 100644 drivers/soc/hisilicon/kunpeng_hccs.c
 create mode 100644 drivers/soc/hisilicon/kunpeng_hccs.h

diff --git a/MAINTAINERS b/MAINTAINERS
index d7b867c57920..082e0c18a49a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9372,6 +9372,12 @@ W:	https://www.hisilicon.com
 F:	Documentation/devicetree/bindings/i2c/hisilicon,ascend910-i2c.yaml
 F:	drivers/i2c/busses/i2c-hisi.c
 
+HISILICON KUNPENG SOC HCCS DRIVER
+M:	Huisong Li <lihuisong@huawei.com>
+S:	Maintained
+F:	drivers/soc/hisilicon/kunpeng_hccs.c
+F:	drivers/soc/hisilicon/kunpeng_hccs.h
+
 HISILICON LPC BUS DRIVER
 M:	Jay Fang <f.fangjian@huawei.com>
 S:	Maintained
diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index 4e176280113a..d21e75d69294 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -10,6 +10,7 @@ source "drivers/soc/bcm/Kconfig"
 source "drivers/soc/canaan/Kconfig"
 source "drivers/soc/fsl/Kconfig"
 source "drivers/soc/fujitsu/Kconfig"
+source "drivers/soc/hisilicon/Kconfig"
 source "drivers/soc/imx/Kconfig"
 source "drivers/soc/ixp4xx/Kconfig"
 source "drivers/soc/litex/Kconfig"
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index 708eaad8f590..0706a27d13be 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_MACH_DOVE)		+= dove/
 obj-y				+= fsl/
 obj-y				+= fujitsu/
 obj-$(CONFIG_ARCH_GEMINI)	+= gemini/
+obj-y				+= hisilicon/
 obj-y				+= imx/
 obj-y				+= ixp4xx/
 obj-$(CONFIG_SOC_XWAY)		+= lantiq/
diff --git a/drivers/soc/hisilicon/Kconfig b/drivers/soc/hisilicon/Kconfig
new file mode 100644
index 000000000000..7c84dd4da0f8
--- /dev/null
+++ b/drivers/soc/hisilicon/Kconfig
@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+menu "Hisilicon SoC drivers"
+	depends on ARCH_HISI || COMPILE_TEST
+
+config KUNPENG_HCCS
+	tristate "HCCS driver on Kunpeng SoC"
+	depends on ACPI
+	depends on ARM64 || COMPILE_TEST
+	help
+	  The Huawei Cache Coherence System (HCCS) is a multi-chip
+	  interconnection bus protocol.
+	  The performance of application may be affected if some HCCS
+	  ports are not in full lane status, have a large number of CRC
+	  errors and so on.
+
+	  Say M here if you want to include support for querying the
+	  health status and port information of HCCS on Kunpeng SoC.
+
+endmenu
diff --git a/drivers/soc/hisilicon/Makefile b/drivers/soc/hisilicon/Makefile
new file mode 100644
index 000000000000..226e747e70d6
--- /dev/null
+++ b/drivers/soc/hisilicon/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_KUNPENG_HCCS)	+= kunpeng_hccs.o
diff --git a/drivers/soc/hisilicon/kunpeng_hccs.c b/drivers/soc/hisilicon/kunpeng_hccs.c
new file mode 100644
index 000000000000..74d351bc0573
--- /dev/null
+++ b/drivers/soc/hisilicon/kunpeng_hccs.c
@@ -0,0 +1,1282 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * The Huawei Cache Coherence System (HCCS) is a multi-chip interconnection
+ * bus protocol.
+ *
+ * Copyright (c) 2023 Hisilicon Limited.
+ * Author: Huisong Li <lihuisong@huawei.com>
+ *
+ * HCCS driver for Kunpeng SoC provides the following features:
+ * - Retrieve the following information about each port:
+ *    - port type
+ *    - lane mode
+ *    - enable
+ *    - current lane mode
+ *    - link finite state machine
+ *    - lane mask
+ *    - CRC error count
+ *
+ * - Retrieve the following information about all the ports on the chip or
+ *   the die:
+ *    - if all enabled ports are in linked
+ *    - if all linked ports are in full lane
+ *    - CRC error count sum
+ */
+#include <linux/acpi.h>
+#include <linux/iopoll.h>
+#include <linux/platform_device.h>
+#include <linux/sysfs.h>
+
+#include <acpi/pcc.h>
+
+#include "kunpeng_hccs.h"
+
+/* PCC defines */
+#define HCCS_PCC_SIGNATURE_MASK		0x50434300
+#define HCCS_PCC_STATUS_CMD_COMPLETE	BIT(0)
+
+/*
+ * Arbitrary retries in case the remote processor is slow to respond
+ * to PCC commands
+ */
+#define HCCS_PCC_CMD_WAIT_RETRIES_NUM		500ULL
+#define HCCS_POLL_STATUS_TIME_INTERVAL_US	3
+
+static struct hccs_port_info *kobj_to_port_info(struct kobject *k)
+{
+	return container_of(k, struct hccs_port_info, kobj);
+}
+
+static struct hccs_die_info *kobj_to_die_info(struct kobject *k)
+{
+	return container_of(k, struct hccs_die_info, kobj);
+}
+
+static struct hccs_chip_info *kobj_to_chip_info(struct kobject *k)
+{
+	return container_of(k, struct hccs_chip_info, kobj);
+}
+
+struct hccs_register_ctx {
+	struct device *dev;
+	u8 chan_id;
+	int err;
+};
+
+static acpi_status hccs_get_register_cb(struct acpi_resource *ares,
+					void *context)
+{
+	struct acpi_resource_generic_register *reg;
+	struct hccs_register_ctx *ctx = context;
+
+	if (ares->type != ACPI_RESOURCE_TYPE_GENERIC_REGISTER)
+		return AE_OK;
+
+	reg = &ares->data.generic_reg;
+	if (reg->space_id != ACPI_ADR_SPACE_PLATFORM_COMM) {
+		dev_err(ctx->dev, "Bad register resource.\n");
+		ctx->err = -EINVAL;
+		return AE_ERROR;
+	}
+	ctx->chan_id = reg->access_size;
+
+	return AE_OK;
+}
+
+static int hccs_get_pcc_chan_id(struct hccs_dev *hdev)
+{
+	acpi_handle handle = ACPI_HANDLE(hdev->dev);
+	struct hccs_register_ctx ctx = {0};
+	acpi_status status;
+
+	if (!acpi_has_method(handle, METHOD_NAME__CRS))
+		return -ENODEV;
+
+	ctx.dev = hdev->dev;
+	status = acpi_walk_resources(handle, METHOD_NAME__CRS,
+				     hccs_get_register_cb, &ctx);
+	if (ACPI_FAILURE(status))
+		return ctx.err;
+	hdev->chan_id = ctx.chan_id;
+
+	return 0;
+}
+
+static void hccs_chan_tx_done(struct mbox_client *cl, void *msg, int ret)
+{
+	if (ret < 0)
+		pr_debug("TX did not complete: CMD sent:0x%x, ret:%d\n",
+			 *(u8 *)msg, ret);
+	else
+		pr_debug("TX completed. CMD sent:0x%x, ret:%d\n",
+			 *(u8 *)msg, ret);
+}
+
+static void hccs_unregister_pcc_channel(struct hccs_dev *hdev)
+{
+	struct hccs_mbox_client_info *cl_info = &hdev->cl_info;
+
+	if (cl_info->pcc_comm_addr)
+		iounmap(cl_info->pcc_comm_addr);
+	pcc_mbox_free_channel(hdev->cl_info.pcc_chan);
+}
+
+static int hccs_register_pcc_channel(struct hccs_dev *hdev)
+{
+	struct hccs_mbox_client_info *cl_info = &hdev->cl_info;
+	struct mbox_client *cl = &cl_info->client;
+	struct pcc_mbox_chan *pcc_chan;
+	struct device *dev = hdev->dev;
+	int rc;
+
+	cl->dev = dev;
+	cl->tx_block = false;
+	cl->knows_txdone = true;
+	cl->tx_done = hccs_chan_tx_done;
+	pcc_chan = pcc_mbox_request_channel(cl, hdev->chan_id);
+	if (IS_ERR(pcc_chan)) {
+		dev_err(dev, "PPC channel request failed.\n");
+		rc = -ENODEV;
+		goto out;
+	}
+	cl_info->pcc_chan = pcc_chan;
+	cl_info->mbox_chan = pcc_chan->mchan;
+
+	/*
+	 * pcc_chan->latency is just a nominal value. In reality the remote
+	 * processor could be much slower to reply. So add an arbitrary amount
+	 * of wait on top of nominal.
+	 */
+	cl_info->deadline_us =
+			HCCS_PCC_CMD_WAIT_RETRIES_NUM * pcc_chan->latency;
+	if (cl_info->mbox_chan->mbox->txdone_irq) {
+		dev_err(dev, "PCC IRQ in PCCT is enabled.\n");
+		rc = -EINVAL;
+		goto err_mbx_channel_free;
+	}
+
+	if (pcc_chan->shmem_base_addr) {
+		cl_info->pcc_comm_addr = (void __force *)ioremap(
+			pcc_chan->shmem_base_addr, pcc_chan->shmem_size);
+		if (!cl_info->pcc_comm_addr) {
+			dev_err(dev, "Failed to ioremap PCC communication region for channel-%d.\n",
+				hdev->chan_id);
+			rc = -ENOMEM;
+			goto err_mbx_channel_free;
+		}
+	}
+
+	return 0;
+
+err_mbx_channel_free:
+	pcc_mbox_free_channel(cl_info->pcc_chan);
+out:
+	return rc;
+}
+
+static int hccs_check_chan_cmd_complete(struct hccs_dev *hdev)
+{
+	struct hccs_mbox_client_info *cl_info = &hdev->cl_info;
+	struct acpi_pcct_shared_memory *comm_base = cl_info->pcc_comm_addr;
+	u16 status;
+	int ret;
+
+	/*
+	 * Poll PCC status register every 3us(delay_us) for maximum of
+	 * deadline_us(timeout_us) until PCC command complete bit is set(cond)
+	 */
+	ret = readw_poll_timeout(&comm_base->status, status,
+				 status & HCCS_PCC_STATUS_CMD_COMPLETE,
+				 HCCS_POLL_STATUS_TIME_INTERVAL_US,
+				 cl_info->deadline_us);
+	if (unlikely(ret))
+		dev_err(hdev->dev, "poll PCC status failed, ret = %d.\n", ret);
+
+	return ret;
+}
+
+static int hccs_pcc_cmd_send(struct hccs_dev *hdev, u8 cmd,
+			     struct hccs_desc *desc)
+{
+	struct hccs_mbox_client_info *cl_info = &hdev->cl_info;
+	struct acpi_pcct_shared_memory *comm_base = cl_info->pcc_comm_addr;
+	void *comm_space = (void *)(comm_base + 1);
+	struct hccs_fw_inner_head *fw_inner_head;
+	struct acpi_pcct_shared_memory tmp = {0};
+	u16 comm_space_size;
+	int ret;
+
+	/* Write signature for this subspace */
+	tmp.signature = HCCS_PCC_SIGNATURE_MASK | hdev->chan_id;
+	/* Write to the shared command region */
+	tmp.command = cmd;
+	/* Clear cmd complete bit */
+	tmp.status = 0;
+	memcpy_toio(comm_base, (void *)&tmp,
+			sizeof(struct acpi_pcct_shared_memory));
+
+	/* Copy the message to the PCC comm space */
+	comm_space_size = HCCS_PCC_SHARE_MEM_BYTES -
+				sizeof(struct acpi_pcct_shared_memory);
+	memcpy_toio(comm_space, (void *)desc, comm_space_size);
+
+	/* Ring doorbell */
+	ret = mbox_send_message(cl_info->mbox_chan, &cmd);
+	if (ret < 0) {
+		dev_err(hdev->dev, "Send PCC mbox message failed, ret = %d.\n",
+			ret);
+		goto end;
+	}
+
+	/* Wait for completion */
+	ret = hccs_check_chan_cmd_complete(hdev);
+	if (ret)
+		goto end;
+
+	/* Copy response data */
+	memcpy_fromio((void *)desc, comm_space, comm_space_size);
+	fw_inner_head = &desc->rsp.fw_inner_head;
+	if (fw_inner_head->retStatus) {
+		dev_err(hdev->dev, "Execute PCC command failed, error code = %u.\n",
+			fw_inner_head->retStatus);
+		ret = -EIO;
+	}
+
+end:
+	mbox_client_txdone(cl_info->mbox_chan, ret);
+	return ret;
+}
+
+static void hccs_init_req_desc(struct hccs_desc *desc)
+{
+	struct hccs_req_desc *req = &desc->req;
+
+	memset(desc, 0, sizeof(*desc));
+	req->req_head.module_code = HCCS_SERDES_MODULE_CODE;
+}
+
+static int hccs_get_dev_caps(struct hccs_dev *hdev)
+{
+	struct hccs_desc desc;
+	int ret;
+
+	hccs_init_req_desc(&desc);
+	ret = hccs_pcc_cmd_send(hdev, HCCS_GET_DEV_CAP, &desc);
+	if (ret) {
+		dev_err(hdev->dev, "Get device capabilities failed, ret = %d.\n",
+			ret);
+		return ret;
+	}
+	memcpy(&hdev->caps, desc.rsp.data, sizeof(hdev->caps));
+
+	return 0;
+}
+
+static int hccs_query_chip_num_on_platform(struct hccs_dev *hdev)
+{
+	struct hccs_desc desc;
+	int ret;
+
+	hccs_init_req_desc(&desc);
+	ret = hccs_pcc_cmd_send(hdev, HCCS_GET_CHIP_NUM, &desc);
+	if (ret) {
+		dev_err(hdev->dev, "query system chip number failed, ret = %d.\n",
+			ret);
+		return ret;
+	}
+
+	hdev->chip_num = *((u8 *)&desc.rsp.data);
+	if (!hdev->chip_num) {
+		dev_err(hdev->dev, "chip num obtained from firmware is zero.\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int hccs_get_chip_info(struct hccs_dev *hdev,
+			      struct hccs_chip_info *chip)
+{
+	struct hccs_die_num_req_param *req_param;
+	struct hccs_desc desc;
+	int ret;
+
+	hccs_init_req_desc(&desc);
+	req_param = (struct hccs_die_num_req_param *)desc.req.data;
+	req_param->chip_id = chip->chip_id;
+	ret = hccs_pcc_cmd_send(hdev, HCCS_GET_DIE_NUM, &desc);
+	if (ret)
+		return ret;
+
+	chip->die_num = *((u8 *)&desc.rsp.data);
+
+	return 0;
+}
+
+static int hccs_query_chip_info_on_platform(struct hccs_dev *hdev)
+{
+	struct hccs_chip_info *chip;
+	int ret;
+	u8 idx;
+
+	ret = hccs_query_chip_num_on_platform(hdev);
+	if (ret) {
+		dev_err(hdev->dev, "query chip number on platform failed, ret = %d.\n",
+			ret);
+		return ret;
+	}
+
+	hdev->chips = devm_kzalloc(hdev->dev,
+				hdev->chip_num * sizeof(struct hccs_chip_info),
+				GFP_KERNEL);
+	if (!hdev->chips) {
+		dev_err(hdev->dev, "allocate all chips memory failed.\n");
+		return -ENOMEM;
+	}
+
+	for (idx = 0; idx < hdev->chip_num; idx++) {
+		chip = &hdev->chips[idx];
+		chip->chip_id = idx;
+		ret = hccs_get_chip_info(hdev, chip);
+		if (ret) {
+			dev_err(hdev->dev, "get chip%u info failed, ret = %d.\n",
+				idx, ret);
+			return ret;
+		}
+		chip->hdev = hdev;
+	}
+
+	return 0;
+}
+
+static int hccs_query_die_info_on_chip(struct hccs_dev *hdev, u8 chip_id,
+				       u8 die_idx, struct hccs_die_info *die)
+{
+	struct hccs_die_info_req_param *req_param;
+	struct hccs_die_info_rsp_data *rsp_data;
+	struct hccs_desc desc;
+	int ret;
+
+	hccs_init_req_desc(&desc);
+	req_param = (struct hccs_die_info_req_param *)desc.req.data;
+	req_param->chip_id = chip_id;
+	req_param->die_idx = die_idx;
+	ret = hccs_pcc_cmd_send(hdev, HCCS_GET_DIE_INFO, &desc);
+	if (ret)
+		return ret;
+
+	rsp_data = (struct hccs_die_info_rsp_data *)desc.rsp.data;
+	die->die_id = rsp_data->die_id;
+	die->port_num = rsp_data->port_num;
+	die->min_port_id = rsp_data->min_port_id;
+	die->max_port_id = rsp_data->max_port_id;
+	if (die->min_port_id > die->max_port_id) {
+		dev_err(hdev->dev, "min port id(%u) > max port id(%u) on die_idx(%u).\n",
+			die->min_port_id, die->max_port_id, die_idx);
+		return -EINVAL;
+	}
+	if (die->max_port_id > HCCS_DIE_MAX_PORT_ID) {
+		dev_err(hdev->dev, "max port id(%u) on die_idx(%u) is too big.\n",
+			die->max_port_id, die_idx);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int hccs_query_all_die_info_on_platform(struct hccs_dev *hdev)
+{
+	struct device *dev = hdev->dev;
+	struct hccs_chip_info *chip;
+	struct hccs_die_info *die;
+	u8 i, j;
+	int ret;
+
+	for (i = 0; i < hdev->chip_num; i++) {
+		chip = &hdev->chips[i];
+		if (!chip->die_num)
+			continue;
+
+		chip->dies = devm_kzalloc(hdev->dev,
+				chip->die_num * sizeof(struct hccs_die_info),
+				GFP_KERNEL);
+		if (!chip->dies) {
+			dev_err(dev, "allocate all dies memory on chip%u failed.\n",
+				i);
+			return -ENOMEM;
+		}
+
+		for (j = 0; j < chip->die_num; j++) {
+			die = &chip->dies[j];
+			ret = hccs_query_die_info_on_chip(hdev, i, j, die);
+			if (ret) {
+				dev_err(dev, "get die idx (%u) info on chip%u failed, ret = %d.\n",
+					j, i, ret);
+				return ret;
+			}
+			die->chip = chip;
+		}
+	}
+
+	return 0;
+}
+
+static int hccs_get_bd_info(struct hccs_dev *hdev, u8 opcode,
+			    struct hccs_desc *desc,
+			    void *buf, size_t buf_len,
+			    struct hccs_rsp_head *rsp_head)
+{
+	struct hccs_rsp_head *head;
+	struct hccs_rsp_desc *rsp;
+	int ret;
+
+	ret = hccs_pcc_cmd_send(hdev, opcode, desc);
+	if (ret)
+		return ret;
+
+	rsp = &desc->rsp;
+	head = &rsp->rsp_head;
+	if (head->data_len > buf_len) {
+		dev_err(hdev->dev,
+			"buffer overflow (buf_len = %lu, data_len = %u)!\n",
+			buf_len, head->data_len);
+		return -ENOMEM;
+	}
+
+	memcpy(buf, rsp->data, head->data_len);
+	*rsp_head = *head;
+
+	return 0;
+}
+
+static int hccs_get_all_port_attr(struct hccs_dev *hdev,
+				  struct hccs_die_info *die,
+				  struct hccs_port_attr *attrs, u16 size)
+{
+	struct hccs_die_comm_req_param *req_param;
+	struct hccs_req_head *req_head;
+	struct hccs_rsp_head rsp_head;
+	struct hccs_desc desc;
+	size_t left_buf_len;
+	u32 data_len = 0;
+	u8 start_id;
+	u8 *buf;
+	int ret;
+
+	buf = (u8 *)attrs;
+	left_buf_len = sizeof(struct hccs_port_attr) * size;
+	start_id = die->min_port_id;
+	while (start_id <= die->max_port_id) {
+		hccs_init_req_desc(&desc);
+		req_head = &desc.req.req_head;
+		req_head->start_id = start_id;
+		req_param = (struct hccs_die_comm_req_param *)desc.req.data;
+		req_param->chip_id = die->chip->chip_id;
+		req_param->die_id = die->die_id;
+
+		ret = hccs_get_bd_info(hdev, HCCS_GET_DIE_PORT_INFO, &desc,
+				       buf + data_len, left_buf_len, &rsp_head);
+		if (ret) {
+			dev_err(hdev->dev,
+				"get the information of port%u on die%u failed, ret = %d.\n",
+				start_id, die->die_id, ret);
+			return ret;
+		}
+
+		data_len += rsp_head.data_len;
+		left_buf_len -= rsp_head.data_len;
+		if (unlikely(rsp_head.next_id <= start_id)) {
+			dev_err(hdev->dev,
+				"next port id (%u) is not greater than last start id (%u) on die%u.\n",
+				rsp_head.next_id, start_id, die->die_id);
+			return -EINVAL;
+		}
+		start_id = rsp_head.next_id;
+	}
+
+	return 0;
+}
+
+static int hccs_get_all_port_info_on_die(struct hccs_dev *hdev,
+					 struct hccs_die_info *die)
+{
+	struct hccs_port_attr *attrs;
+	struct hccs_port_info *port;
+	int ret;
+	u8 i;
+
+	attrs = kcalloc(die->port_num, sizeof(struct hccs_port_attr),
+			GFP_KERNEL);
+	if (!attrs)
+		return -ENOMEM;
+
+	ret = hccs_get_all_port_attr(hdev, die, attrs, die->port_num);
+	if (ret)
+		goto out;
+
+	for (i = 0; i < die->port_num; i++) {
+		port = &die->ports[i];
+		port->port_id = attrs[i].port_id;
+		port->port_type = attrs[i].port_type;
+		port->lane_mode = attrs[i].lane_mode;
+		port->enable = attrs[i].enable;
+		port->die = die;
+	}
+
+out:
+	kfree(attrs);
+	return ret;
+}
+
+static int hccs_query_all_port_info_on_platform(struct hccs_dev *hdev)
+{
+
+	struct device *dev = hdev->dev;
+	struct hccs_chip_info *chip;
+	struct hccs_die_info *die;
+	u8 i, j;
+	int ret;
+
+	for (i = 0; i < hdev->chip_num; i++) {
+		chip = &hdev->chips[i];
+		for (j = 0; j < chip->die_num; j++) {
+			die = &chip->dies[j];
+			if (!die->port_num)
+				continue;
+
+			die->ports = devm_kzalloc(dev,
+				die->port_num * sizeof(struct hccs_port_info),
+				GFP_KERNEL);
+			if (!die->ports) {
+				dev_err(dev, "allocate ports memory on chip%u/die%u failed.\n",
+					i, die->die_id);
+				return -ENOMEM;
+			}
+
+			ret = hccs_get_all_port_info_on_die(hdev, die);
+			if (ret) {
+				dev_err(dev, "get die(%u) info on chip%u failed, ret = %d.\n",
+					die->die_id, i, ret);
+				return ret;
+			}
+		}
+	}
+
+	return 0;
+}
+
+static int hccs_get_hw_info(struct hccs_dev *hdev)
+{
+	int ret;
+
+	ret = hccs_query_chip_info_on_platform(hdev);
+	if (ret) {
+		dev_err(hdev->dev, "query chip info on platform  failed, ret = %d.\n",
+			ret);
+		return ret;
+	}
+
+	ret = hccs_query_all_die_info_on_platform(hdev);
+	if (ret) {
+		dev_err(hdev->dev, "query all die info on platform failed, ret = %d.\n",
+			ret);
+		return ret;
+	}
+
+	ret = hccs_query_all_port_info_on_platform(hdev);
+	if (ret) {
+		dev_err(hdev->dev, "query all port info on platform failed, ret = %d.\n",
+			ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int hccs_query_port_link_status(struct hccs_dev *hdev,
+				       const struct hccs_port_info *port,
+				       struct hccs_link_status *link_status)
+{
+	const struct hccs_die_info *die = port->die;
+	const struct hccs_chip_info *chip = die->chip;
+	struct hccs_port_comm_req_param *req_param;
+	struct hccs_desc desc;
+	int ret;
+
+	hccs_init_req_desc(&desc);
+	req_param = (struct hccs_port_comm_req_param *)desc.req.data;
+	req_param->chip_id = chip->chip_id;
+	req_param->die_id = die->die_id;
+	req_param->port_id = port->port_id;
+	ret = hccs_pcc_cmd_send(hdev, HCCS_GET_PORT_LINK_STATUS, &desc);
+	if (ret) {
+		dev_err(hdev->dev,
+			"get port link status info failed, ret = %d.\n", ret);
+		return ret;
+	}
+
+	*link_status = *((struct hccs_link_status *)desc.rsp.data);
+
+	return 0;
+}
+
+static int hccs_query_port_crc_err_cnt(struct hccs_dev *hdev,
+				       const struct hccs_port_info *port,
+				       u64 *crc_err_cnt)
+{
+	const struct hccs_die_info *die = port->die;
+	const struct hccs_chip_info *chip = die->chip;
+	struct hccs_port_comm_req_param *req_param;
+	struct hccs_desc desc;
+	int ret;
+
+	hccs_init_req_desc(&desc);
+	req_param = (struct hccs_port_comm_req_param *)desc.req.data;
+	req_param->chip_id = chip->chip_id;
+	req_param->die_id = die->die_id;
+	req_param->port_id = port->port_id;
+	ret = hccs_pcc_cmd_send(hdev, HCCS_GET_PORT_CRC_ERR_CNT, &desc);
+	if (ret) {
+		dev_err(hdev->dev,
+			"get port crc error count failed, ret = %d.\n", ret);
+		return ret;
+	}
+
+	memcpy(crc_err_cnt, &desc.rsp.data, sizeof(u64));
+
+	return 0;
+}
+
+static int hccs_get_die_all_link_status(struct hccs_dev *hdev,
+					const struct hccs_die_info *die,
+					u8 *all_linked)
+{
+	struct hccs_die_comm_req_param *req_param;
+	struct hccs_desc desc;
+	int ret;
+
+	if (die->port_num == 0) {
+		*all_linked = 1;
+		return 0;
+	}
+
+	hccs_init_req_desc(&desc);
+	req_param = (struct hccs_die_comm_req_param *)desc.req.data;
+	req_param->chip_id = die->chip->chip_id;
+	req_param->die_id = die->die_id;
+	ret = hccs_pcc_cmd_send(hdev, HCCS_GET_DIE_PORTS_LANE_STA, &desc);
+	if (ret) {
+		dev_err(hdev->dev,
+			"get link status of all ports failed on die%u, ret = %d.\n",
+			die->die_id, ret);
+		return ret;
+	}
+
+	*all_linked = *((u8 *)&desc.rsp.data);
+
+	return 0;
+}
+
+static int hccs_get_die_all_port_lane_status(struct hccs_dev *hdev,
+					     const struct hccs_die_info *die,
+					     u8 *full_lane)
+{
+	struct hccs_die_comm_req_param *req_param;
+	struct hccs_desc desc;
+	int ret;
+
+	if (die->port_num == 0) {
+		*full_lane = 1;
+		return 0;
+	}
+
+	hccs_init_req_desc(&desc);
+	req_param = (struct hccs_die_comm_req_param *)desc.req.data;
+	req_param->chip_id = die->chip->chip_id;
+	req_param->die_id = die->die_id;
+	ret = hccs_pcc_cmd_send(hdev, HCCS_GET_DIE_PORTS_LANE_STA, &desc);
+	if (ret) {
+		dev_err(hdev->dev, "get lane status of all ports failed on die%u, ret = %d.\n",
+			die->die_id, ret);
+		return ret;
+	}
+
+	*full_lane = *((u8 *)&desc.rsp.data);
+
+	return 0;
+}
+
+static int hccs_get_die_total_crc_err_cnt(struct hccs_dev *hdev,
+					  const struct hccs_die_info *die,
+					  u64 *total_crc_err_cnt)
+{
+	struct hccs_die_comm_req_param *req_param;
+	struct hccs_desc desc;
+	int ret;
+
+	if (die->port_num == 0) {
+		*total_crc_err_cnt = 0;
+		return 0;
+	}
+
+	hccs_init_req_desc(&desc);
+	req_param = (struct hccs_die_comm_req_param *)desc.req.data;
+	req_param->chip_id = die->chip->chip_id;
+	req_param->die_id = die->die_id;
+	ret = hccs_pcc_cmd_send(hdev, HCCS_GET_DIE_PORTS_CRC_ERR_CNT, &desc);
+	if (ret) {
+		dev_err(hdev->dev, "get crc error count sum failed on die%u, ret = %d.\n",
+			die->die_id, ret);
+		return ret;
+	}
+
+	memcpy(total_crc_err_cnt, &desc.rsp.data, sizeof(u64));
+
+	return 0;
+}
+
+static ssize_t hccs_show(struct kobject *k, struct attribute *attr, char *buf)
+{
+	struct kobj_attribute *kobj_attr;
+
+	kobj_attr = container_of(attr, struct kobj_attribute, attr);
+
+	return kobj_attr->show(k, kobj_attr, buf);
+}
+
+static const struct sysfs_ops hccs_comm_ops = {
+	.show = hccs_show,
+};
+
+static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr,
+			 char *buf)
+{
+	const struct hccs_port_info *port = kobj_to_port_info(kobj);
+
+	return sysfs_emit(buf, "HCCS-v%u\n", port->port_type);
+}
+
+static struct kobj_attribute hccs_type_attr = __ATTR_RO(type);
+
+static ssize_t lane_mode_show(struct kobject *kobj, struct kobj_attribute *attr,
+			      char *buf)
+{
+	const struct hccs_port_info *port = kobj_to_port_info(kobj);
+
+	return sysfs_emit(buf, "x%u\n", port->lane_mode);
+}
+
+static struct kobj_attribute lane_mode_attr = __ATTR_RO(lane_mode);
+
+static ssize_t enable_show(struct kobject *kobj,
+				 struct kobj_attribute *attr, char *buf)
+{
+	const struct hccs_port_info *port = kobj_to_port_info(kobj);
+
+	return sysfs_emit(buf, "%u\n", port->enable);
+}
+
+static struct kobj_attribute port_enable_attr = __ATTR_RO(enable);
+
+static ssize_t cur_lane_num_show(struct kobject *kobj,
+				 struct kobj_attribute *attr, char *buf)
+{
+	const struct hccs_port_info *port = kobj_to_port_info(kobj);
+	struct hccs_dev *hdev = port->die->chip->hdev;
+	struct hccs_link_status link_status = {0};
+	int ret;
+
+	mutex_lock(&hdev->lock);
+	ret = hccs_query_port_link_status(hdev, port, &link_status);
+	mutex_unlock(&hdev->lock);
+	if (ret)
+		return ret;
+
+	return sysfs_emit(buf, "%u\n", link_status.lane_num);
+}
+
+static struct kobj_attribute cur_lane_num_attr = __ATTR_RO(cur_lane_num);
+
+static ssize_t link_fsm_show(struct kobject *kobj,
+			     struct kobj_attribute *attr, char *buf)
+{
+	const struct hccs_port_info *port = kobj_to_port_info(kobj);
+	struct hccs_dev *hdev = port->die->chip->hdev;
+	struct hccs_link_status link_status = {0};
+	const struct {
+		u8 link_fsm;
+		char *str;
+	} link_fsm_map[] = {
+		{HCCS_PORT_RESET, "reset"},
+		{HCCS_PORT_SETUP, "setup"},
+		{HCCS_PORT_CONFIG, "config"},
+		{HCCS_PORT_READY, "link-up"},
+	};
+	const char *link_fsm_str = "unknown";
+	size_t i;
+	int ret;
+
+	mutex_lock(&hdev->lock);
+	ret = hccs_query_port_link_status(hdev, port, &link_status);
+	mutex_unlock(&hdev->lock);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < ARRAY_SIZE(link_fsm_map); i++) {
+		if (link_fsm_map[i].link_fsm == link_status.link_fsm) {
+			link_fsm_str = link_fsm_map[i].str;
+			break;
+		}
+	}
+
+	return sysfs_emit(buf, "%s\n", link_fsm_str);
+}
+
+static struct kobj_attribute link_fsm_attr = __ATTR_RO(link_fsm);
+
+static ssize_t lane_mask_show(struct kobject *kobj,
+			      struct kobj_attribute *attr, char *buf)
+{
+	const struct hccs_port_info *port = kobj_to_port_info(kobj);
+	struct hccs_dev *hdev = port->die->chip->hdev;
+	struct hccs_link_status link_status = {0};
+	int ret;
+
+	mutex_lock(&hdev->lock);
+	ret = hccs_query_port_link_status(hdev, port, &link_status);
+	mutex_unlock(&hdev->lock);
+	if (ret)
+		return ret;
+
+	return sysfs_emit(buf, "0x%x\n", link_status.lane_mask);
+}
+
+static struct kobj_attribute lane_mask_attr = __ATTR_RO(lane_mask);
+
+static ssize_t crc_err_cnt_show(struct kobject *kobj,
+				struct kobj_attribute *attr, char *buf)
+{
+	const struct hccs_port_info *port = kobj_to_port_info(kobj);
+	struct hccs_dev *hdev = port->die->chip->hdev;
+	u64 crc_err_cnt;
+	int ret;
+
+	mutex_lock(&hdev->lock);
+	ret = hccs_query_port_crc_err_cnt(hdev, port, &crc_err_cnt);
+	mutex_unlock(&hdev->lock);
+	if (ret)
+		return ret;
+
+	return sysfs_emit(buf, "%llu\n", crc_err_cnt);
+}
+
+static struct kobj_attribute crc_err_cnt_attr = __ATTR_RO(crc_err_cnt);
+
+static struct attribute *hccs_port_default_attrs[] = {
+	&hccs_type_attr.attr,
+	&lane_mode_attr.attr,
+	&port_enable_attr.attr,
+	&cur_lane_num_attr.attr,
+	&link_fsm_attr.attr,
+	&lane_mask_attr.attr,
+	&crc_err_cnt_attr.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(hccs_port_default);
+
+static const struct kobj_type hccs_port_type = {
+	.sysfs_ops = &hccs_comm_ops,
+	.default_groups = hccs_port_default_groups,
+};
+
+static ssize_t all_linked_on_die_show(struct kobject *kobj,
+				      struct kobj_attribute *attr, char *buf)
+{
+	const struct hccs_die_info *die = kobj_to_die_info(kobj);
+	struct hccs_dev *hdev = die->chip->hdev;
+	u8 all_linked;
+	int ret;
+
+	mutex_lock(&hdev->lock);
+	ret = hccs_get_die_all_link_status(hdev, die, &all_linked);
+	mutex_unlock(&hdev->lock);
+	if (ret)
+		return ret;
+
+	return sysfs_emit(buf, "%u\n", all_linked);
+}
+static struct kobj_attribute all_linked_on_die_attr =
+		__ATTR(all_linked, 0444, all_linked_on_die_show, NULL);
+
+static ssize_t linked_full_lane_on_die_show(struct kobject *kobj,
+					    struct kobj_attribute *attr,
+					    char *buf)
+{
+	const struct hccs_die_info *die = kobj_to_die_info(kobj);
+	struct hccs_dev *hdev = die->chip->hdev;
+	u8 full_lane;
+	int ret;
+
+	mutex_lock(&hdev->lock);
+	ret = hccs_get_die_all_port_lane_status(hdev, die, &full_lane);
+	mutex_unlock(&hdev->lock);
+	if (ret)
+		return ret;
+
+	return sysfs_emit(buf, "%u\n", full_lane);
+}
+static struct kobj_attribute linked_full_lane_on_die_attr =
+	__ATTR(linked_full_lane, 0444, linked_full_lane_on_die_show, NULL);
+
+static ssize_t crc_err_cnt_sum_on_die_show(struct kobject *kobj,
+					   struct kobj_attribute *attr,
+					   char *buf)
+{
+	const struct hccs_die_info *die = kobj_to_die_info(kobj);
+	struct hccs_dev *hdev = die->chip->hdev;
+	u64 total_crc_err_cnt;
+	int ret;
+
+	mutex_lock(&hdev->lock);
+	ret = hccs_get_die_total_crc_err_cnt(hdev, die, &total_crc_err_cnt);
+	mutex_unlock(&hdev->lock);
+	if (ret)
+		return ret;
+
+	return sysfs_emit(buf, "%llu\n", total_crc_err_cnt);
+}
+static struct kobj_attribute crc_err_cnt_sum_on_die_attr =
+	__ATTR(crc_err_cnt, 0444, crc_err_cnt_sum_on_die_show, NULL);
+
+static struct attribute *hccs_die_default_attrs[] = {
+	&all_linked_on_die_attr.attr,
+	&linked_full_lane_on_die_attr.attr,
+	&crc_err_cnt_sum_on_die_attr.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(hccs_die_default);
+
+static const struct kobj_type hccs_die_type = {
+	.sysfs_ops = &hccs_comm_ops,
+	.default_groups = hccs_die_default_groups,
+};
+
+static ssize_t all_linked_on_chip_show(struct kobject *kobj,
+				       struct kobj_attribute *attr, char *buf)
+{
+	const struct hccs_chip_info *chip = kobj_to_chip_info(kobj);
+	struct hccs_dev *hdev = chip->hdev;
+	const struct hccs_die_info *die;
+	u8 all_linked = 1;
+	u8 i, tmp;
+	int ret;
+
+	mutex_lock(&hdev->lock);
+	for (i = 0; i < chip->die_num; i++) {
+		die = &chip->dies[i];
+		ret = hccs_get_die_all_link_status(hdev, die, &tmp);
+		if (ret) {
+			mutex_unlock(&hdev->lock);
+			return ret;
+		}
+		if (tmp != all_linked) {
+			all_linked = 0;
+			break;
+		}
+	}
+	mutex_unlock(&hdev->lock);
+
+	return sysfs_emit(buf, "%u\n", all_linked);
+}
+static struct kobj_attribute all_linked_on_chip_attr =
+		__ATTR(all_linked, 0444, all_linked_on_chip_show, NULL);
+
+static ssize_t linked_full_lane_on_chip_show(struct kobject *kobj,
+					     struct kobj_attribute *attr,
+					     char *buf)
+{
+	const struct hccs_chip_info *chip = kobj_to_chip_info(kobj);
+	struct hccs_dev *hdev = chip->hdev;
+	const struct hccs_die_info *die;
+	u8 full_lane = 1;
+	u8 i, tmp;
+	int ret;
+
+	mutex_lock(&hdev->lock);
+	for (i = 0; i < chip->die_num; i++) {
+		die = &chip->dies[i];
+		ret = hccs_get_die_all_port_lane_status(hdev, die, &tmp);
+		if (ret) {
+			mutex_unlock(&hdev->lock);
+			return ret;
+		}
+		if (tmp != full_lane) {
+			full_lane = 0;
+			break;
+		}
+	}
+	mutex_unlock(&hdev->lock);
+
+	return sysfs_emit(buf, "%u\n", full_lane);
+}
+static struct kobj_attribute linked_full_lane_on_chip_attr =
+	__ATTR(linked_full_lane, 0444, linked_full_lane_on_chip_show, NULL);
+
+static ssize_t crc_err_cnt_sum_on_chip_show(struct kobject *kobj,
+					    struct kobj_attribute *attr,
+					    char *buf)
+{
+	const struct hccs_chip_info *chip = kobj_to_chip_info(kobj);
+	u64 crc_err_cnt, total_crc_err_cnt = 0;
+	struct hccs_dev *hdev = chip->hdev;
+	const struct hccs_die_info *die;
+	int ret;
+	u16 i;
+
+	mutex_lock(&hdev->lock);
+	for (i = 0; i < chip->die_num; i++) {
+		die = &chip->dies[i];
+		ret = hccs_get_die_total_crc_err_cnt(hdev, die, &crc_err_cnt);
+		if (ret) {
+			mutex_unlock(&hdev->lock);
+			return ret;
+		}
+
+		total_crc_err_cnt += crc_err_cnt;
+	}
+	mutex_unlock(&hdev->lock);
+
+	return sysfs_emit(buf, "%llu\n", total_crc_err_cnt);
+}
+static struct kobj_attribute crc_err_cnt_sum_on_chip_attr =
+		__ATTR(crc_err_cnt, 0444, crc_err_cnt_sum_on_chip_show, NULL);
+
+static struct attribute *hccs_chip_default_attrs[] = {
+	&all_linked_on_chip_attr.attr,
+	&linked_full_lane_on_chip_attr.attr,
+	&crc_err_cnt_sum_on_chip_attr.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(hccs_chip_default);
+
+static const struct kobj_type hccs_chip_type = {
+	.sysfs_ops = &hccs_comm_ops,
+	.default_groups = hccs_chip_default_groups,
+};
+
+static void hccs_remove_die_dir(struct hccs_die_info *die)
+{
+	struct hccs_port_info *port;
+	u8 i;
+
+	for (i = 0; i < die->port_num; i++) {
+		port = &die->ports[i];
+		if (port->dir_created)
+			kobject_put(&port->kobj);
+	}
+
+	kobject_put(&die->kobj);
+}
+
+static void hccs_remove_chip_dir(struct hccs_chip_info *chip)
+{
+	struct hccs_die_info *die;
+	u8 i;
+
+	for (i = 0; i < chip->die_num; i++) {
+		die = &chip->dies[i];
+		if (die->dir_created)
+			hccs_remove_die_dir(die);
+	}
+
+	kobject_put(&chip->kobj);
+}
+
+static void hccs_remove_topo_dirs(struct hccs_dev *hdev)
+{
+	u8 i;
+
+	for (i = 0; i < hdev->chip_num; i++)
+		hccs_remove_chip_dir(&hdev->chips[i]);
+}
+
+static int hccs_create_hccs_dir(struct hccs_dev *hdev,
+				struct hccs_die_info *die,
+				struct hccs_port_info *port)
+{
+	int ret;
+
+	ret = kobject_init_and_add(&port->kobj, &hccs_port_type,
+				   &die->kobj, "hccs%d", port->port_id);
+	if (ret) {
+		kobject_put(&port->kobj);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int hccs_create_die_dir(struct hccs_dev *hdev,
+			       struct hccs_chip_info *chip,
+			       struct hccs_die_info *die)
+{
+	struct hccs_port_info *port;
+	int ret;
+	u16 i;
+
+	ret = kobject_init_and_add(&die->kobj, &hccs_die_type,
+				   &chip->kobj, "die%d", die->die_id);
+	if (ret) {
+		kobject_put(&die->kobj);
+		return ret;
+	}
+
+	for (i = 0; i < die->port_num; i++) {
+		port = &die->ports[i];
+		ret = hccs_create_hccs_dir(hdev, die, port);
+		if (ret) {
+			dev_err(hdev->dev, "create hccs%d dir failed.\n",
+				port->port_id);
+			goto err;
+		}
+		port->dir_created = true;
+	}
+
+	return 0;
+err:
+	hccs_remove_die_dir(die);
+
+	return ret;
+}
+
+static int hccs_create_chip_dir(struct hccs_dev *hdev,
+				struct hccs_chip_info *chip)
+{
+	struct hccs_die_info *die;
+	int ret;
+	u16 id;
+
+	ret = kobject_init_and_add(&chip->kobj, &hccs_chip_type,
+				   &hdev->dev->kobj, "chip%d", chip->chip_id);
+	if (ret) {
+		kobject_put(&chip->kobj);
+		return ret;
+	}
+
+	for (id = 0; id < chip->die_num; id++) {
+		die = &chip->dies[id];
+		ret = hccs_create_die_dir(hdev, chip, die);
+		if (ret)
+			goto err;
+		die->dir_created = true;
+	}
+
+	return 0;
+err:
+	hccs_remove_chip_dir(chip);
+
+	return ret;
+}
+
+static int hccs_create_topo_dirs(struct hccs_dev *hdev)
+{
+	struct hccs_chip_info *chip;
+	u8 id, k;
+	int ret;
+
+	for (id = 0; id < hdev->chip_num; id++) {
+		chip = &hdev->chips[id];
+		ret = hccs_create_chip_dir(hdev, chip);
+		if (ret) {
+			dev_err(hdev->dev, "init chip%d dir failed!\n", id);
+			goto err;
+		}
+	}
+
+	return 0;
+err:
+	for (k = 0; k < id; k++)
+		hccs_remove_chip_dir(&hdev->chips[k]);
+
+	return ret;
+}
+
+static int hccs_probe(struct platform_device *pdev)
+{
+	struct acpi_device *acpi_dev;
+	struct hccs_dev *hdev;
+	int rc;
+
+	if (acpi_disabled) {
+		dev_err(&pdev->dev, "acpi is disabled.\n");
+		return -ENODEV;
+	}
+	acpi_dev = ACPI_COMPANION(&pdev->dev);
+	if (!acpi_dev)
+		return -ENODEV;
+
+	hdev = devm_kzalloc(&pdev->dev, sizeof(*hdev), GFP_KERNEL);
+	if (!hdev)
+		return -ENOMEM;
+	hdev->acpi_dev = acpi_dev;
+	hdev->dev = &pdev->dev;
+	platform_set_drvdata(pdev, hdev);
+
+	mutex_init(&hdev->lock);
+	rc = hccs_get_pcc_chan_id(hdev);
+	if (rc)
+		return rc;
+	rc = hccs_register_pcc_channel(hdev);
+	if (rc)
+		return rc;
+
+	rc = hccs_get_dev_caps(hdev);
+	if (rc)
+		goto unregister_pcc_chan;
+
+	rc = hccs_get_hw_info(hdev);
+	if (rc)
+		goto unregister_pcc_chan;
+
+	rc = hccs_create_topo_dirs(hdev);
+	if (rc)
+		goto unregister_pcc_chan;
+
+	return 0;
+
+unregister_pcc_chan:
+	hccs_unregister_pcc_channel(hdev);
+
+	return rc;
+}
+
+static int hccs_remove(struct platform_device *pdev)
+{
+	struct hccs_dev *hdev = platform_get_drvdata(pdev);
+
+	hccs_remove_topo_dirs(hdev);
+	hccs_unregister_pcc_channel(hdev);
+
+	return 0;
+}
+
+static const struct acpi_device_id hccs_acpi_match[] = {
+	{ "HISI04B1"},
+	{ ""},
+};
+MODULE_DEVICE_TABLE(acpi, hccs_acpi_match);
+
+static struct platform_driver hccs_driver = {
+	.probe = hccs_probe,
+	.remove = hccs_remove,
+	.driver = {
+		.name = "kunpeng_hccs",
+		.acpi_match_table = hccs_acpi_match,
+	},
+};
+
+module_platform_driver(hccs_driver);
+
+MODULE_DESCRIPTION("Kunpeng SoC HCCS driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Huisong Li <lihuisong@huawei.com>");
diff --git a/drivers/soc/hisilicon/kunpeng_hccs.h b/drivers/soc/hisilicon/kunpeng_hccs.h
new file mode 100644
index 000000000000..f9a79904d9c7
--- /dev/null
+++ b/drivers/soc/hisilicon/kunpeng_hccs.h
@@ -0,0 +1,196 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/* Copyright (c) 2023 Hisilicon Limited. */
+
+#ifndef __KUNPENG_HCCS_H__
+#define __KUNPENG_HCCS_H__
+
+/*
+ * |---------------  Chip0  ---------------|----------------  ChipN  -------------|
+ * |--------Die0-------|--------DieN-------|--------Die0-------|-------DieN-------|
+ * | P0 | P1 | P2 | P3 | P0 | P1 | P2 | P3 | P0 | P1 | P2 | P3 |P0 | P1 | P2 | P3 |
+ */
+
+/*
+ * This value cannot be 255, otherwise the loop of the multi-BD communication
+ * case cannot end.
+ */
+#define HCCS_DIE_MAX_PORT_ID	254
+
+struct hccs_port_info {
+	u8 port_id;
+	u8 port_type;
+	u8 lane_mode;
+	bool enable; /* if the port is enabled */
+	struct kobject kobj;
+	bool dir_created;
+	struct hccs_die_info *die; /* point to the die the port is located */
+};
+
+struct hccs_die_info {
+	u8 die_id;
+	u8 port_num;
+	u8 min_port_id;
+	u8 max_port_id;
+	struct hccs_port_info *ports;
+	struct kobject kobj;
+	bool dir_created;
+	struct hccs_chip_info *chip; /* point to the chip the die is located */
+};
+
+struct hccs_chip_info {
+	u8 chip_id;
+	u8 die_num;
+	struct hccs_die_info *dies;
+	struct kobject kobj;
+	struct hccs_dev *hdev;
+};
+
+struct hccs_mbox_client_info {
+	struct mbox_client client;
+	struct mbox_chan *mbox_chan;
+	struct pcc_mbox_chan *pcc_chan;
+	u64 deadline_us;
+	void *pcc_comm_addr;
+};
+
+struct hccs_dev {
+	struct device *dev;
+	struct acpi_device *acpi_dev;
+	u64 caps;
+	u8 chip_num;
+	struct hccs_chip_info *chips;
+	u8 chan_id;
+	struct mutex lock;
+	struct hccs_mbox_client_info cl_info;
+};
+
+#define HCCS_SERDES_MODULE_CODE 0x32
+enum hccs_subcmd_type {
+	HCCS_GET_CHIP_NUM = 0x1,
+	HCCS_GET_DIE_NUM,
+	HCCS_GET_DIE_INFO,
+	HCCS_GET_DIE_PORT_INFO,
+	HCCS_GET_DEV_CAP,
+	HCCS_GET_PORT_LINK_STATUS,
+	HCCS_GET_PORT_CRC_ERR_CNT,
+	HCCS_GET_DIE_PORTS_LANE_STA,
+	HCCS_GET_DIE_PORTS_LINK_STA,
+	HCCS_GET_DIE_PORTS_CRC_ERR_CNT,
+	HCCS_SUB_CMD_MAX = 255,
+};
+
+struct hccs_die_num_req_param {
+	u8 chip_id;
+};
+
+struct hccs_die_info_req_param {
+	u8 chip_id;
+	u8 die_idx;
+};
+
+struct hccs_die_info_rsp_data {
+	u8 die_id;
+	u8 port_num;
+	u8 min_port_id;
+	u8 max_port_id;
+};
+
+struct hccs_port_attr {
+	u8 port_id;
+	u8 port_type;
+	u8 lane_mode;
+	u8 enable : 1; /* if the port is enabled */
+	u16 rsv[2];
+};
+
+/*
+ * The common command request for getting the all information of HCCS port on
+ * specified DIE.
+ */
+struct hccs_die_comm_req_param {
+	u8 chip_id;
+	u8 die_id; /* id in hardware */
+};
+
+/* The common command request for getting the information of a specific port */
+struct hccs_port_comm_req_param {
+	u8 chip_id;
+	u8 die_id;
+	u8 port_id;
+};
+
+#define HCCS_PORT_RESET         1
+#define HCCS_PORT_SETUP         2
+#define HCCS_PORT_CONFIG        3
+#define HCCS_PORT_READY         4
+struct hccs_link_status {
+	u8 lane_mask; /* indicate which lanes are used. */
+	u8 link_fsm : 3; /* link fsm, 1: reset 2: setup 3: config 4: link-up */
+	u8 lane_num : 5; /* current lane number */
+};
+
+struct hccs_req_head {
+	u8 module_code; /* set to 0x32 for serdes */
+	u8 start_id;
+	u8 rsv[2];
+};
+
+struct hccs_rsp_head {
+	u8 data_len;
+	u8 next_id;
+	u8 rsv[2];
+};
+
+struct hccs_fw_inner_head {
+	u8 retStatus; /* 0: success, other: failure */
+	u8 rsv[7];
+};
+
+#define HCCS_PCC_SHARE_MEM_BYTES	64
+#define HCCS_FW_INNER_HEAD_BYTES	8
+#define HCCS_RSP_HEAD_BYTES		4
+
+#define HCCS_MAX_RSP_DATA_BYTES		(HCCS_PCC_SHARE_MEM_BYTES - \
+					 HCCS_FW_INNER_HEAD_BYTES - \
+					 HCCS_RSP_HEAD_BYTES)
+#define HCCS_MAX_RSP_DATA_SIZE_MAX	(HCCS_MAX_RSP_DATA_BYTES / 4)
+
+/*
+ * Note: Actual available size of data field also depands on the PCC header
+ * bytes of the specific type. Driver needs to copy the response data in the
+ * communication space based on the real length.
+ */
+struct hccs_rsp_desc {
+	struct hccs_fw_inner_head fw_inner_head; /* 8 Bytes */
+	struct hccs_rsp_head rsp_head; /* 4 Bytes */
+	u32 data[HCCS_MAX_RSP_DATA_SIZE_MAX];
+};
+
+#define HCCS_REQ_HEAD_BYTES		4
+#define HCCS_MAX_REQ_DATA_BYTES		(HCCS_PCC_SHARE_MEM_BYTES - \
+					 HCCS_REQ_HEAD_BYTES)
+#define HCCS_MAX_REQ_DATA_SIZE_MAX	(HCCS_MAX_REQ_DATA_BYTES / 4)
+
+/*
+ * Note: Actual available size of data field also depands on the PCC header
+ * bytes of the specific type. Driver needs to copy the request data to the
+ * communication space based on the real length.
+ */
+struct hccs_req_desc {
+	struct hccs_req_head req_head; /* 4 Bytes */
+	u32 data[HCCS_MAX_REQ_DATA_SIZE_MAX];
+};
+
+struct hccs_desc {
+	union {
+		struct hccs_req_desc req;
+		struct hccs_rsp_desc rsp;
+	};
+};
+
+#define hccs_get_field(origin, mask, shift) \
+	(((origin) & (mask)) >> (shift))
+#define hccs_get_bit(origin, shift) \
+	hccs_get_field((origin), (0x1UL << (shift)), (shift))
+
+#endif /* __KUNPENG_HCCS_H__ */
-- 
2.33.0