Quelle  stratix10-rsu.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2018-2019, Intel Corporation
 */

#include <linux/arm-smccc.h>
#include <linux/bitfield.h>
#include <linux/completion.h>
#include <linux/kobject.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/firmware/intel/stratix10-svc-client.h>
#include <linux/string.h>
#include <linux/sysfs.h>

#define RSU_STATE_MASK   GENMASK_ULL(31, 0)
#define RSU_VERSION_MASK  GENMASK_ULL(63, 32)
#define RSU_ERROR_LOCATION_MASK  GENMASK_ULL(31, 0)
#define RSU_ERROR_DETAIL_MASK  GENMASK_ULL(63, 32)
#define RSU_DCMF0_MASK   GENMASK_ULL(31, 0)
#define RSU_DCMF1_MASK   GENMASK_ULL(63, 32)
#define RSU_DCMF2_MASK   GENMASK_ULL(31, 0)
#define RSU_DCMF3_MASK   GENMASK_ULL(63, 32)
#define RSU_DCMF0_STATUS_MASK  GENMASK_ULL(15, 0)
#define RSU_DCMF1_STATUS_MASK  GENMASK_ULL(31, 16)
#define RSU_DCMF2_STATUS_MASK  GENMASK_ULL(47, 32)
#define RSU_DCMF3_STATUS_MASK  GENMASK_ULL(63, 48)

#define RSU_TIMEOUT (msecs_to_jiffies(SVC_RSU_REQUEST_TIMEOUT_MS))

#define INVALID_RETRY_COUNTER  0xFF
#define INVALID_DCMF_VERSION  0xFF
#define INVALID_DCMF_STATUS  0xFFFFFFFF
#define INVALID_SPT_ADDRESS  0x0

#define RSU_GET_SPT_CMD   0x5A
#define RSU_GET_SPT_RESP_LEN  (4 * sizeof(unsigned int))

typedef void (*rsu_callback)(struct stratix10_svc_client *client,
        struct stratix10_svc_cb_data *data);
/**
 * struct stratix10_rsu_priv - rsu data structure
 * @chan: pointer to the allocated service channel
 * @client: active service client
 * @completion: state for callback completion
 * @lock: a mutex to protect callback completion state
 * @status.current_image: address of image currently running in flash
 * @status.fail_image: address of failed image in flash
 * @status.version: the interface version number of RSU firmware
 * @status.state: the state of RSU system
 * @status.error_details: error code
 * @status.error_location: the error offset inside the image that failed
 * @dcmf_version.dcmf0: Quartus dcmf0 version
 * @dcmf_version.dcmf1: Quartus dcmf1 version
 * @dcmf_version.dcmf2: Quartus dcmf2 version
 * @dcmf_version.dcmf3: Quartus dcmf3 version
 * @dcmf_status.dcmf0: dcmf0 status
 * @dcmf_status.dcmf1: dcmf1 status
 * @dcmf_status.dcmf2: dcmf2 status
 * @dcmf_status.dcmf3: dcmf3 status
 * @retry_counter: the current image's retry counter
 * @max_retry: the preset max retry value
 * @spt0_address: address of spt0
 * @spt1_address: address of spt1
 * @get_spt_response_buf: response from sdm for get_spt command
 */
struct stratix10_rsu_priv {
 struct stratix10_svc_chan *chan;
 struct stratix10_svc_client client;
 struct completion completion;
 struct mutex lock;
 struct {
  unsigned long current_image;
  unsigned long fail_image;
  unsigned int version;
  unsigned int state;
  unsigned int error_details;
  unsigned int error_location;
 } status;

 struct {
  unsigned int dcmf0;
  unsigned int dcmf1;
  unsigned int dcmf2;
  unsigned int dcmf3;
 } dcmf_version;

 struct {
  unsigned int dcmf0;
  unsigned int dcmf1;
  unsigned int dcmf2;
  unsigned int dcmf3;
 } dcmf_status;

 unsigned int retry_counter;
 unsigned int max_retry;

 unsigned long spt0_address;
 unsigned long spt1_address;

 unsigned int *get_spt_response_buf;
};

/**
 * rsu_status_callback() - Status callback from Intel Service Layer
 * @client: pointer to service client
 * @data: pointer to callback data structure
 *
 * Callback from Intel service layer for RSU status request. Status is
 * only updated after a system reboot, so a get updated status call is
 * made during driver probe.
 */
static void rsu_status_callback(struct stratix10_svc_client *client,
    struct stratix10_svc_cb_data *data)
{
 struct stratix10_rsu_priv *priv = client->priv;
 struct arm_smccc_res *res = (struct arm_smccc_res *)data->kaddr1;

 if (data->status == BIT(SVC_STATUS_OK)) {
  priv->status.version = FIELD_GET(RSU_VERSION_MASK,
       res->a2);
  priv->status.state = FIELD_GET(RSU_STATE_MASK, res->a2);
  priv->status.fail_image = res->a1;
  priv->status.current_image = res->a0;
  priv->status.error_location =
   FIELD_GET(RSU_ERROR_LOCATION_MASK, res->a3);
  priv->status.error_details =
   FIELD_GET(RSU_ERROR_DETAIL_MASK, res->a3);
 } else {
  dev_err(client->dev, "COMMAND_RSU_STATUS returned 0x%lX\n",
   res->a0);
  priv->status.version = 0;
  priv->status.state = 0;
  priv->status.fail_image = 0;
  priv->status.current_image = 0;
  priv->status.error_location = 0;
  priv->status.error_details = 0;
 }

 complete(&priv->completion);
}

/**
 * rsu_command_callback() - Update callback from Intel Service Layer
 * @client: pointer to client
 * @data: pointer to callback data structure
 *
 * Callback from Intel service layer for RSU commands.
 */
static void rsu_command_callback(struct stratix10_svc_client *client,
     struct stratix10_svc_cb_data *data)
{
 struct stratix10_rsu_priv *priv = client->priv;

 if (data->status == BIT(SVC_STATUS_NO_SUPPORT))
  dev_warn(client->dev, "Secure FW doesn't support notify\n");
 else if (data->status == BIT(SVC_STATUS_ERROR))
  dev_err(client->dev, "Failure, returned status is %lu\n",
   BIT(data->status));

 complete(&priv->completion);
}

/**
 * rsu_retry_callback() - Callback from Intel service layer for getting
 * the current image's retry counter from the firmware
 * @client: pointer to client
 * @data: pointer to callback data structure
 *
 * Callback from Intel service layer for retry counter, which is used by
 * user to know how many times the images is still allowed to reload
 * itself before giving up and starting RSU fail-over flow.
 */
static void rsu_retry_callback(struct stratix10_svc_client *client,
          struct stratix10_svc_cb_data *data)
{
 struct stratix10_rsu_priv *priv = client->priv;
 unsigned int *counter = (unsigned int *)data->kaddr1;

 if (data->status == BIT(SVC_STATUS_OK))
  priv->retry_counter = *counter;
 else if (data->status == BIT(SVC_STATUS_NO_SUPPORT))
  dev_warn(client->dev, "Secure FW doesn't support retry\n");
 else
  dev_err(client->dev, "Failed to get retry counter %lu\n",
   BIT(data->status));

 complete(&priv->completion);
}

/**
 * rsu_max_retry_callback() - Callback from Intel service layer for getting
 * the max retry value from the firmware
 * @client: pointer to client
 * @data: pointer to callback data structure
 *
 * Callback from Intel service layer for max retry.
 */
static void rsu_max_retry_callback(struct stratix10_svc_client *client,
       struct stratix10_svc_cb_data *data)
{
 struct stratix10_rsu_priv *priv = client->priv;
 unsigned int *max_retry = (unsigned int *)data->kaddr1;

 if (data->status == BIT(SVC_STATUS_OK))
  priv->max_retry = *max_retry;
 else if (data->status == BIT(SVC_STATUS_NO_SUPPORT))
  dev_warn(client->dev, "Secure FW doesn't support max retry\n");
 else
  dev_err(client->dev, "Failed to get max retry %lu\n",
   BIT(data->status));

 complete(&priv->completion);
}

/**
 * rsu_dcmf_version_callback() - Callback from Intel service layer for getting
 * the DCMF version
 * @client: pointer to client
 * @data: pointer to callback data structure
 *
 * Callback from Intel service layer for DCMF version number
 */
static void rsu_dcmf_version_callback(struct stratix10_svc_client *client,
          struct stratix10_svc_cb_data *data)
{
 struct stratix10_rsu_priv *priv = client->priv;
 unsigned long long *value1 = (unsigned long long *)data->kaddr1;
 unsigned long long *value2 = (unsigned long long *)data->kaddr2;

 if (data->status == BIT(SVC_STATUS_OK)) {
  priv->dcmf_version.dcmf0 = FIELD_GET(RSU_DCMF0_MASK, *value1);
  priv->dcmf_version.dcmf1 = FIELD_GET(RSU_DCMF1_MASK, *value1);
  priv->dcmf_version.dcmf2 = FIELD_GET(RSU_DCMF2_MASK, *value2);
  priv->dcmf_version.dcmf3 = FIELD_GET(RSU_DCMF3_MASK, *value2);
 } else
  dev_err(client->dev, "failed to get DCMF version\n");

 complete(&priv->completion);
}

/**
 * rsu_dcmf_status_callback() - Callback from Intel service layer for getting
 * the DCMF status
 * @client: pointer to client
 * @data: pointer to callback data structure
 *
 * Callback from Intel service layer for DCMF status
 */
static void rsu_dcmf_status_callback(struct stratix10_svc_client *client,
         struct stratix10_svc_cb_data *data)
{
 struct stratix10_rsu_priv *priv = client->priv;
 unsigned long long *value = (unsigned long long *)data->kaddr1;

 if (data->status == BIT(SVC_STATUS_OK)) {
  priv->dcmf_status.dcmf0 = FIELD_GET(RSU_DCMF0_STATUS_MASK,
          *value);
  priv->dcmf_status.dcmf1 = FIELD_GET(RSU_DCMF1_STATUS_MASK,
          *value);
  priv->dcmf_status.dcmf2 = FIELD_GET(RSU_DCMF2_STATUS_MASK,
          *value);
  priv->dcmf_status.dcmf3 = FIELD_GET(RSU_DCMF3_STATUS_MASK,
          *value);
 } else
  dev_err(client->dev, "failed to get DCMF status\n");

 complete(&priv->completion);
}

static void rsu_get_spt_callback(struct stratix10_svc_client *client,
     struct stratix10_svc_cb_data *data)
{
 struct stratix10_rsu_priv *priv = client->priv;
 unsigned long *mbox_err = (unsigned long *)data->kaddr1;
 unsigned long *resp_len = (unsigned long *)data->kaddr2;

 if (data->status != BIT(SVC_STATUS_OK) || (*mbox_err) ||
     (*resp_len != RSU_GET_SPT_RESP_LEN))
  goto error;

 priv->spt0_address = priv->get_spt_response_buf[0];
 priv->spt0_address <<= 32;
 priv->spt0_address |= priv->get_spt_response_buf[1];

 priv->spt1_address = priv->get_spt_response_buf[2];
 priv->spt1_address <<= 32;
 priv->spt1_address |= priv->get_spt_response_buf[3];

 goto complete;

error:
 dev_err(client->dev, "failed to get SPTs\n");

complete:
 stratix10_svc_free_memory(priv->chan, priv->get_spt_response_buf);
 priv->get_spt_response_buf = NULL;
 complete(&priv->completion);
}

/**
 * rsu_send_msg() - send a message to Intel service layer
 * @priv: pointer to rsu private data
 * @command: RSU status or update command
 * @arg: the request argument, the bitstream address or notify status
 * @callback: function pointer for the callback (status or update)
 *
 * Start an Intel service layer transaction to perform the SMC call that
 * is necessary to get RSU boot log or set the address of bitstream to
 * boot after reboot.
 *
 * Returns 0 on success or -ETIMEDOUT on error.
 */
static int rsu_send_msg(struct stratix10_rsu_priv *priv,
   enum stratix10_svc_command_code command,
   unsigned long arg,
   rsu_callback callback)
{
 struct stratix10_svc_client_msg msg;
 int ret;

 mutex_lock(&priv->lock);
 reinit_completion(&priv->completion);
 priv->client.receive_cb = callback;

 msg.command = command;
 if (arg)
  msg.arg[0] = arg;

 if (command == COMMAND_MBOX_SEND_CMD) {
  msg.arg[1] = 0;
  msg.payload = NULL;
  msg.payload_length = 0;
  msg.payload_output = priv->get_spt_response_buf;
  msg.payload_length_output = RSU_GET_SPT_RESP_LEN;
 }

 ret = stratix10_svc_send(priv->chan, &msg);
 if (ret < 0)
  goto status_done;

 ret = wait_for_completion_interruptible_timeout(&priv->completion,
       RSU_TIMEOUT);
 if (!ret) {
  dev_err(priv->client.dev,
   "timeout waiting for SMC call\n");
  ret = -ETIMEDOUT;
  goto status_done;
 } else if (ret < 0) {
  dev_err(priv->client.dev,
   "error %d waiting for SMC call\n", ret);
  goto status_done;
 } else {
  ret = 0;
 }

status_done:
 stratix10_svc_done(priv->chan);
 mutex_unlock(&priv->lock);
 return ret;
}

/*
 * This driver exposes some optional features of the Intel Stratix 10 SoC FPGA.
 * The sysfs interfaces exposed here are FPGA Remote System Update (RSU)
 * related. They allow user space software to query the configuration system
 * status and to request optional reboot behavior specific to Intel FPGAs.
 */

static ssize_t current_image_show(struct device *dev,
      struct device_attribute *attr, char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 return sprintf(buf, "0x%08lx\n", priv->status.current_image);
}

static ssize_t fail_image_show(struct device *dev,
          struct device_attribute *attr, char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 return sprintf(buf, "0x%08lx\n", priv->status.fail_image);
}

static ssize_t version_show(struct device *dev, struct device_attribute *attr,
       char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 return sprintf(buf, "0x%08x\n", priv->status.version);
}

static ssize_t state_show(struct device *dev, struct device_attribute *attr,
     char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 return sprintf(buf, "0x%08x\n", priv->status.state);
}

static ssize_t error_location_show(struct device *dev,
       struct device_attribute *attr, char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 return sprintf(buf, "0x%08x\n", priv->status.error_location);
}

static ssize_t error_details_show(struct device *dev,
      struct device_attribute *attr, char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 return sprintf(buf, "0x%08x\n", priv->status.error_details);
}

static ssize_t retry_counter_show(struct device *dev,
      struct device_attribute *attr, char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 return sprintf(buf, "0x%08x\n", priv->retry_counter);
}

static ssize_t max_retry_show(struct device *dev,
         struct device_attribute *attr, char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 return scnprintf(buf, sizeof(priv->max_retry),
    "0x%08x\n", priv->max_retry);
}

static ssize_t dcmf0_show(struct device *dev,
     struct device_attribute *attr, char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 return sprintf(buf, "0x%08x\n", priv->dcmf_version.dcmf0);
}

static ssize_t dcmf1_show(struct device *dev,
     struct device_attribute *attr, char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 return sprintf(buf, "0x%08x\n", priv->dcmf_version.dcmf1);
}

static ssize_t dcmf2_show(struct device *dev,
     struct device_attribute *attr, char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 return sprintf(buf, "0x%08x\n", priv->dcmf_version.dcmf2);
}

static ssize_t dcmf3_show(struct device *dev,
     struct device_attribute *attr, char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 return sprintf(buf, "0x%08x\n", priv->dcmf_version.dcmf3);
}

static ssize_t dcmf0_status_show(struct device *dev,
     struct device_attribute *attr, char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 if (priv->dcmf_status.dcmf0 == INVALID_DCMF_STATUS)
  return -EIO;

 return sprintf(buf, "0x%08x\n", priv->dcmf_status.dcmf0);
}

static ssize_t dcmf1_status_show(struct device *dev,
     struct device_attribute *attr, char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 if (priv->dcmf_status.dcmf1 == INVALID_DCMF_STATUS)
  return -EIO;

 return sprintf(buf, "0x%08x\n", priv->dcmf_status.dcmf1);
}

static ssize_t dcmf2_status_show(struct device *dev,
    struct device_attribute *attr, char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 if (priv->dcmf_status.dcmf2 == INVALID_DCMF_STATUS)
  return -EIO;

 return sprintf(buf, "0x%08x\n", priv->dcmf_status.dcmf2);
}

static ssize_t dcmf3_status_show(struct device *dev,
     struct device_attribute *attr, char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 if (priv->dcmf_status.dcmf3 == INVALID_DCMF_STATUS)
  return -EIO;

 return sprintf(buf, "0x%08x\n", priv->dcmf_status.dcmf3);
}
static ssize_t reboot_image_store(struct device *dev,
      struct device_attribute *attr,
      const char *buf, size_t count)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);
 unsigned long address;
 int ret;

 if (!priv)
  return -ENODEV;

 ret = kstrtoul(buf, 0, &address);
 if (ret)
  return ret;

 ret = rsu_send_msg(priv, COMMAND_RSU_UPDATE,
      address, rsu_command_callback);
 if (ret) {
  dev_err(dev, "Error, RSU update returned %i\n", ret);
  return ret;
 }

 return count;
}

static ssize_t notify_store(struct device *dev,
       struct device_attribute *attr,
       const char *buf, size_t count)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);
 unsigned long status;
 int ret;

 if (!priv)
  return -ENODEV;

 ret = kstrtoul(buf, 0, &status);
 if (ret)
  return ret;

 ret = rsu_send_msg(priv, COMMAND_RSU_NOTIFY,
      status, rsu_command_callback);
 if (ret) {
  dev_err(dev, "Error, RSU notify returned %i\n", ret);
  return ret;
 }

 /* to get the updated state */
 ret = rsu_send_msg(priv, COMMAND_RSU_STATUS,
      0, rsu_status_callback);
 if (ret) {
  dev_err(dev, "Error, getting RSU status %i\n", ret);
  return ret;
 }

 ret = rsu_send_msg(priv, COMMAND_RSU_RETRY, 0, rsu_retry_callback);
 if (ret) {
  dev_err(dev, "Error, getting RSU retry %i\n", ret);
  return ret;
 }

 return count;
}

static ssize_t spt0_address_show(struct device *dev,
     struct device_attribute *attr, char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 if (priv->spt0_address == INVALID_SPT_ADDRESS)
  return -EIO;

 return scnprintf(buf, PAGE_SIZE, "0x%08lx\n", priv->spt0_address);
}

static ssize_t spt1_address_show(struct device *dev,
     struct device_attribute *attr, char *buf)
{
 struct stratix10_rsu_priv *priv = dev_get_drvdata(dev);

 if (!priv)
  return -ENODEV;

 if (priv->spt1_address == INVALID_SPT_ADDRESS)
  return -EIO;

 return scnprintf(buf, PAGE_SIZE, "0x%08lx\n", priv->spt1_address);
}

static DEVICE_ATTR_RO(current_image);
static DEVICE_ATTR_RO(fail_image);
static DEVICE_ATTR_RO(state);
static DEVICE_ATTR_RO(version);
static DEVICE_ATTR_RO(error_location);
static DEVICE_ATTR_RO(error_details);
static DEVICE_ATTR_RO(retry_counter);
static DEVICE_ATTR_RO(max_retry);
static DEVICE_ATTR_RO(dcmf0);
static DEVICE_ATTR_RO(dcmf1);
static DEVICE_ATTR_RO(dcmf2);
static DEVICE_ATTR_RO(dcmf3);
static DEVICE_ATTR_RO(dcmf0_status);
static DEVICE_ATTR_RO(dcmf1_status);
static DEVICE_ATTR_RO(dcmf2_status);
static DEVICE_ATTR_RO(dcmf3_status);
static DEVICE_ATTR_WO(reboot_image);
static DEVICE_ATTR_WO(notify);
static DEVICE_ATTR_RO(spt0_address);
static DEVICE_ATTR_RO(spt1_address);

static struct attribute *rsu_attrs[] = {
 &dev_attr_current_image.attr,
 &dev_attr_fail_image.attr,
 &dev_attr_state.attr,
 &dev_attr_version.attr,
 &dev_attr_error_location.attr,
 &dev_attr_error_details.attr,
 &dev_attr_retry_counter.attr,
 &dev_attr_max_retry.attr,
 &dev_attr_dcmf0.attr,
 &dev_attr_dcmf1.attr,
 &dev_attr_dcmf2.attr,
 &dev_attr_dcmf3.attr,
 &dev_attr_dcmf0_status.attr,
 &dev_attr_dcmf1_status.attr,
 &dev_attr_dcmf2_status.attr,
 &dev_attr_dcmf3_status.attr,
 &dev_attr_reboot_image.attr,
 &dev_attr_notify.attr,
 &dev_attr_spt0_address.attr,
 &dev_attr_spt1_address.attr,
 NULL
};

ATTRIBUTE_GROUPS(rsu);

static int stratix10_rsu_probe(struct platform_device *pdev)
{
 struct device *dev = &pdev->dev;
 struct stratix10_rsu_priv *priv;
 int ret;

 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 if (!priv)
  return -ENOMEM;

 priv->client.dev = dev;
 priv->client.receive_cb = NULL;
 priv->client.priv = priv;
 priv->status.current_image = 0;
 priv->status.fail_image = 0;
 priv->status.error_location = 0;
 priv->status.error_details = 0;
 priv->status.version = 0;
 priv->status.state = 0;
 priv->retry_counter = INVALID_RETRY_COUNTER;
 priv->dcmf_version.dcmf0 = INVALID_DCMF_VERSION;
 priv->dcmf_version.dcmf1 = INVALID_DCMF_VERSION;
 priv->dcmf_version.dcmf2 = INVALID_DCMF_VERSION;
 priv->dcmf_version.dcmf3 = INVALID_DCMF_VERSION;
 priv->dcmf_status.dcmf0 = INVALID_DCMF_STATUS;
 priv->dcmf_status.dcmf1 = INVALID_DCMF_STATUS;
 priv->dcmf_status.dcmf2 = INVALID_DCMF_STATUS;
 priv->dcmf_status.dcmf3 = INVALID_DCMF_STATUS;
 priv->max_retry = INVALID_RETRY_COUNTER;
 priv->spt0_address = INVALID_SPT_ADDRESS;
 priv->spt1_address = INVALID_SPT_ADDRESS;

 mutex_init(&priv->lock);
 priv->chan = stratix10_svc_request_channel_byname(&priv->client,
         SVC_CLIENT_RSU);
 if (IS_ERR(priv->chan)) {
  dev_err(dev, "couldn't get service channel %s\n",
   SVC_CLIENT_RSU);
  return PTR_ERR(priv->chan);
 }

 init_completion(&priv->completion);
 platform_set_drvdata(pdev, priv);

 /* get the initial state from firmware */
 ret = rsu_send_msg(priv, COMMAND_RSU_STATUS,
      0, rsu_status_callback);
 if (ret) {
  dev_err(dev, "Error, getting RSU status %i\n", ret);
  stratix10_svc_free_channel(priv->chan);
 }

 /* get DCMF version from firmware */
 ret = rsu_send_msg(priv, COMMAND_RSU_DCMF_VERSION,
      0, rsu_dcmf_version_callback);
 if (ret) {
  dev_err(dev, "Error, getting DCMF version %i\n", ret);
  stratix10_svc_free_channel(priv->chan);
 }

 ret = rsu_send_msg(priv, COMMAND_RSU_DCMF_STATUS,
      0, rsu_dcmf_status_callback);
 if (ret) {
  dev_err(dev, "Error, getting DCMF status %i\n", ret);
  stratix10_svc_free_channel(priv->chan);
 }

 ret = rsu_send_msg(priv, COMMAND_RSU_RETRY, 0, rsu_retry_callback);
 if (ret) {
  dev_err(dev, "Error, getting RSU retry %i\n", ret);
  stratix10_svc_free_channel(priv->chan);
 }

 ret = rsu_send_msg(priv, COMMAND_RSU_MAX_RETRY, 0,
      rsu_max_retry_callback);
 if (ret) {
  dev_err(dev, "Error, getting RSU max retry %i\n", ret);
  stratix10_svc_free_channel(priv->chan);
 }

 priv->get_spt_response_buf =
  stratix10_svc_allocate_memory(priv->chan, RSU_GET_SPT_RESP_LEN);

 if (IS_ERR(priv->get_spt_response_buf)) {
  dev_err(dev, "failed to allocate get spt buffer\n");
 } else {
  ret = rsu_send_msg(priv, COMMAND_MBOX_SEND_CMD,
       RSU_GET_SPT_CMD, rsu_get_spt_callback);
  if (ret) {
   dev_err(dev, "Error, getting SPT table %i\n", ret);
   stratix10_svc_free_channel(priv->chan);
  }
 }

 return ret;
}

static void stratix10_rsu_remove(struct platform_device *pdev)
{
 struct stratix10_rsu_priv *priv = platform_get_drvdata(pdev);

 stratix10_svc_free_channel(priv->chan);
}

static struct platform_driver stratix10_rsu_driver = {
 .probe = stratix10_rsu_probe,
 .remove = stratix10_rsu_remove,
 .driver = {
  .name = "stratix10-rsu",
  .dev_groups = rsu_groups,
 },
};

module_platform_driver(stratix10_rsu_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel Remote System Update Driver");
MODULE_AUTHOR("Richard Gong ");