On Wed, Jul 11, 2018 at 04:01:30PM -0500, Eddie James wrote:
> The OCC is a device embedded on a POWER processor that collects and
> aggregates sensor data from the processor and system. The OCC can
> provide the raw sensor data as well as perform thermal and power
> management on the system.
>
> This driver provides an atomic communications channel between a service
> processor (e.g. a BMC) and the OCC. The driver is dependent on the FSI
> SBEFIFO driver to get hardware access through the SBE to the OCC SRAM.
> Commands are issued to the SBE to send or fetch data to the SRAM.
>
> Signed-off-by: Eddie James <eajames@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Andrew Jeffery <andrew@xxxxxxxx>
> Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Joel Stanley <joel@xxxxxxxxx>
> ---
> drivers/fsi/Kconfig | 10 +
> drivers/fsi/Makefile | 1 +
> drivers/fsi/fsi-occ.c | 609 ++++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/fsi-occ.h | 34 +++
> 4 files changed, 654 insertions(+)
> create mode 100644 drivers/fsi/fsi-occ.c
> create mode 100644 include/linux/fsi-occ.h
>
> diff --git a/drivers/fsi/Kconfig b/drivers/fsi/Kconfig
> index 24f84a9..322cec3 100644
> --- a/drivers/fsi/Kconfig
> +++ b/drivers/fsi/Kconfig
> @@ -39,4 +39,14 @@ config FSI_SBEFIFO
> a pipe-like FSI device for communicating with the self boot engine
> (SBE) on POWER processors.
>
> +config FSI_OCC
> + tristate "OCC SBEFIFO client device driver"
> + depends on FSI_SBEFIFO
> + ---help---
> + This option enables an SBEFIFO based On-Chip Controller (OCC) device
> + driver. The OCC is a device embedded on a POWER processor that collects
> + and aggregates sensor data from the processor and system. The OCC can
> + provide the raw sensor data as well as perform thermal and power
> + management on the system.
> +
> endif
> diff --git a/drivers/fsi/Makefile b/drivers/fsi/Makefile
> index 851182e..75fdc6d 100644
> --- a/drivers/fsi/Makefile
> +++ b/drivers/fsi/Makefile
> @@ -4,3 +4,4 @@ obj-$(CONFIG_FSI_MASTER_HUB) += fsi-master-hub.o
> obj-$(CONFIG_FSI_MASTER_GPIO) += fsi-master-gpio.o
> obj-$(CONFIG_FSI_SCOM) += fsi-scom.o
> obj-$(CONFIG_FSI_SBEFIFO) += fsi-sbefifo.o
> +obj-$(CONFIG_FSI_OCC) += fsi-occ.o
> diff --git a/drivers/fsi/fsi-occ.c b/drivers/fsi/fsi-occ.c
> new file mode 100644
> index 0000000..bba67a6
> --- /dev/null
> +++ b/drivers/fsi/fsi-occ.c
> @@ -0,0 +1,609 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * On-Chip Controller Driver
> + *
> + * Copyright (C) IBM Corporation 2018
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
I thought the whole idea of using SPDX license identifiers was to get rid
of this boilerplate.
> + */
> +
> +#include <asm/unaligned.h>
asm includes should be after generic includes.
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/errno.h>
> +#include <linux/fs.h>
> +#include <linux/fsi-sbefifo.h>
> +#include <linux/gfp.h>
> +#include <linux/idr.h>
> +#include <linux/kernel.h>
> +#include <linux/list.h>
> +#include <linux/miscdevice.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/fsi-occ.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/sched.h>
> +#include <linux/slab.h>
> +#include <linux/uaccess.h>
> +
> +#define OCC_SRAM_BYTES 4096
> +#define OCC_CMD_DATA_BYTES 4090
> +#define OCC_RESP_DATA_BYTES 4089
> +
> +#define OCC_SRAM_CMD_ADDR 0xFFFBE000
> +#define OCC_SRAM_RSP_ADDR 0xFFFBF000
> +
> +/*
> + * Assume we don't have much FFDC, if we do we'll overflow and
> + * fail the command. This needs to be big enough for simple
> + * commands as well.
> + */
> +#define OCC_SBE_STATUS_WORDS 32
> +
> +#define OCC_TIMEOUT_MS 1000
> +#define OCC_CMD_IN_PRG_WAIT_MS 50
> +
> +struct occ {
> + struct device *dev;
> + struct device *sbefifo;
> + char name[32];
> + int idx;
> + struct miscdevice mdev;
> + struct mutex occ_lock;
> +};
> +
> +#define to_occ(x) container_of((x), struct occ, mdev)
> +
> +struct occ_response {
> + u8 seq_no;
> + u8 cmd_type;
> + u8 return_status;
> + __be16 data_length;
> + u8 data[OCC_RESP_DATA_BYTES + 2]; /* two bytes checksum */
> +} __packed;
> +
> +struct occ_client {
> + struct occ *occ;
> + struct mutex lock;
> + size_t data_size;
> + size_t read_offset;
> + u8 *buffer;
> +};
> +
> +#define to_client(x) container_of((x), struct occ_client, xfr)
> +
> +static DEFINE_IDA(occ_ida);
> +
> +static int occ_open(struct inode *inode, struct file *file)
> +{
> + struct occ_client *client = kzalloc(sizeof(*client), GFP_KERNEL);
> + struct miscdevice *mdev = file->private_data;
> + struct occ *occ = to_occ(mdev);
> +
> + if (!client)
> + return -ENOMEM;
> +
> + client->buffer = (u8 *)__get_free_page(GFP_KERNEL);
> + if (!client->buffer) {
> + kfree(client);
> + return -ENOMEM;
> + }
> +
> + client->occ = occ;
> + mutex_init(&client->lock);
> + file->private_data = client;
> +
> + /* We allocate a 1-page buffer, make sure it all fits */
> + BUILD_BUG_ON((OCC_CMD_DATA_BYTES + 3) > PAGE_SIZE);
> + BUILD_BUG_ON((OCC_RESP_DATA_BYTES + 7) > PAGE_SIZE);
> +
> + return 0;
> +}
> +
> +static ssize_t occ_read(struct file *file, char __user *buf, size_t len,
> + loff_t *offset)
> +{
> + struct occ_client *client = file->private_data;
> + ssize_t rc = 0;
> +
> + if (!client)
> + return -ENODEV;
> +
> + if (len > OCC_SRAM_BYTES)
> + return -EINVAL;
> +
> + mutex_lock(&client->lock);
> +
> + /* This should not be possible ... */
> + if (WARN_ON_ONCE(client->read_offset > client->data_size)) {
> + rc = -EIO;
> + goto done;
> + }
> +
> + /* Grab how much data we have to read */
> + rc = min(len, client->data_size - client->read_offset);
> + if (copy_to_user(buf, client->buffer + client->read_offset, rc))
> + rc = -EFAULT;
> + else
> + client->read_offset += rc;
> +
> + done:
> + mutex_unlock(&client->lock);
> +
> + return rc;
> +}
> +
> +static ssize_t occ_write(struct file *file, const char __user *buf,
> + size_t len, loff_t *offset)
> +{
> + struct occ_client *client = file->private_data;
> + size_t rlen, data_length;
> + u16 checksum = 0;
> + ssize_t rc, i;
> + u8 *cmd;
> +
> + if (!client)
> + return -ENODEV;
> +
> + if (len > (OCC_CMD_DATA_BYTES + 3) || len < 3)
> + return -EINVAL;
> +
> + mutex_lock(&client->lock);
> +
> + /* Construct the command */
> + cmd = client->buffer;
> +
> + /* Sequence number (we could increment and compare with response) */
> + cmd[0] = 1;
> +
> + /*
> + * Copy the user command (assume user data follows the occ command
> + * format)
> + * byte 0: command type
> + * bytes 1-2: data length (msb first)
> + * bytes 3-n: data
> + */
> + if (copy_from_user(&cmd[1], buf, len)) {
> + rc = -EFAULT;
> + goto done;
> + }
> +
> + /* Extract data length */
> + data_length = (cmd[2] << 8) + cmd[3];
> + if (data_length > OCC_CMD_DATA_BYTES) {
> + rc = -EINVAL;
> + goto done;
> + }
> +
> + /* Calculate checksum */
> + for (i = 0; i < data_length + 4; ++i)
> + checksum += cmd[i];
> +
> + cmd[data_length + 4] = checksum >> 8;
> + cmd[data_length + 5] = checksum & 0xFF;
> +
> + /* Submit command */
> + rlen = PAGE_SIZE;
> + rc = fsi_occ_submit(client->occ->dev, cmd, data_length + 6, cmd,
> + &rlen);
> + if (rc)
> + goto done;
> +
> + /* Set read tracking data */
> + client->data_size = rlen;
> + client->read_offset = 0;
> +
> + /* Done */
> + rc = len;
> +
> + done:
> + mutex_unlock(&client->lock);
> +
> + return rc;
> +}
> +
> +static int occ_release(struct inode *inode, struct file *file)
> +{
> + struct occ_client *client = file->private_data;
> +
> + free_page((unsigned long)client->buffer);
> + kfree(client);
> +
> + return 0;
> +}
> +
> +static const struct file_operations occ_fops = {
> + .owner = THIS_MODULE,
> + .open = occ_open,
> + .read = occ_read,
> + .write = occ_write,
> + .release = occ_release,
> +};
> +
> +static int occ_verify_checksum(struct occ_response *resp, u16 data_length)
> +{
> + /* Fetch the two bytes after the data for the checksum. */
> + u16 checksum_resp = get_unaligned_be16(&resp->data[data_length]);
> + u16 checksum;
> + u16 i;
> +
> + checksum = resp->seq_no;
> + checksum += resp->cmd_type;
> + checksum += resp->return_status;
> + checksum += (data_length >> 8) + (data_length & 0xFF);
> +
> + for (i = 0; i < data_length; ++i)
> + checksum += resp->data[i];
> +
> + if (checksum != checksum_resp)
> + return -EBADMSG;
> +
> + return 0;
> +}
> +
> +static int occ_getsram(struct occ *occ, u32 address, void *data, ssize_t len)
> +{
> + u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */
> + size_t resp_len, resp_data_len;
> + __be32 *resp, cmd[5];
> + int rc;
> +
> + /*
> + * Magic sequence to do SBE getsram command. SBE will fetch data from
> + * specified SRAM address.
> + */
> + cmd[0] = cpu_to_be32(0x5);
> + cmd[1] = cpu_to_be32(SBEFIFO_CMD_GET_OCC_SRAM);
> + cmd[2] = cpu_to_be32(1);
> + cmd[3] = cpu_to_be32(address);
> + cmd[4] = cpu_to_be32(data_len);
> +
> + resp_len = (data_len >> 2) + OCC_SBE_STATUS_WORDS;
> + resp = kzalloc(resp_len << 2, GFP_KERNEL);
> + if (!resp)
> + return -ENOMEM;
> +
> + rc = sbefifo_submit(occ->sbefifo, cmd, 5, resp, &resp_len);
> + if (rc)
> + goto free;
> +
> + rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_GET_OCC_SRAM,
> + resp, resp_len, &resp_len);
> + if (rc)
> + goto free;
> +
> + resp_data_len = be32_to_cpu(resp[resp_len - 1]);
> + if (resp_data_len != data_len) {
> + dev_err(occ->dev, "SRAM read expected %d bytes got %zd\n",
> + data_len, resp_data_len);
> + rc = -EBADMSG;
> + } else {
> + memcpy(data, resp, len);
> + }
> +
> +free:
> + /* Convert positive SBEI status */
> + if (rc > 0) {
> + dev_err(occ->dev, "SRAM read returned failure status: %08x\n",
> + rc);
> + rc = -EBADMSG;
> + }
> +
> + kfree(resp);
> + return rc;
> +}
> +
> +static int occ_putsram(struct occ *occ, u32 address, const void *data,
> + ssize_t len)
> +{
> + size_t cmd_len, buf_len, resp_len, resp_data_len;
> + u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */
> + __be32 *buf;
> + int rc;
> +
> + /*
> + * We use the same buffer for command and response, make
> + * sure it's big enough
> + */
> + resp_len = OCC_SBE_STATUS_WORDS;
> + cmd_len = (data_len >> 2) + 5;
> + buf_len = max(cmd_len, resp_len);
> + buf = kzalloc(buf_len << 2, GFP_KERNEL);
> + if (!buf)
> + return -ENOMEM;
> +
> + /*
> + * Magic sequence to do SBE putsram command. SBE will transfer
> + * data to specified SRAM address.
> + */
> + buf[0] = cpu_to_be32(cmd_len);
> + buf[1] = cpu_to_be32(SBEFIFO_CMD_PUT_OCC_SRAM);
> + buf[2] = cpu_to_be32(1);
> + buf[3] = cpu_to_be32(address);
> + buf[4] = cpu_to_be32(data_len);
> +
> + memcpy(&buf[5], data, len);
> +
> + rc = sbefifo_submit(occ->sbefifo, buf, cmd_len, buf, &resp_len);
> + if (rc)
> + goto free;
> +
> + rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_PUT_OCC_SRAM,
> + buf, resp_len, &resp_len);
> + if (rc)
> + goto free;
> +
> + if (resp_len != 1) {
> + dev_err(occ->dev, "SRAM write response length invalid: %zd\n",
> + resp_len);
> + rc = -EBADMSG;
> + } else {
> + resp_data_len = be32_to_cpu(buf[0]);
> + if (resp_data_len != data_len) {
> + dev_err(occ->dev,
> + "SRAM write expected %d bytes got %zd\n",
> + data_len, resp_data_len);
> + rc = -EBADMSG;
> + }
> + }
> +
> +free:
> + /* Convert positive SBEI status */
> + if (rc > 0) {
> + dev_err(occ->dev, "SRAM write returned failure status: %08x\n",
> + rc);
> + rc = -EBADMSG;
> + }
> +
> + kfree(buf);
> + return rc;
> +}
> +
> +static int occ_trigger_attn(struct occ *occ)
> +{
> + __be32 buf[OCC_SBE_STATUS_WORDS];
> + size_t resp_len, resp_data_len;
> + int rc;
> +
> + BUILD_BUG_ON(OCC_SBE_STATUS_WORDS < 7);
> + resp_len = OCC_SBE_STATUS_WORDS;
> +
> + buf[0] = cpu_to_be32(0x5 + 0x2); /* Chip-op length in words */
> + buf[1] = cpu_to_be32(SBEFIFO_CMD_PUT_OCC_SRAM);
> + buf[2] = cpu_to_be32(0x3); /* Mode: Circular */
> + buf[3] = cpu_to_be32(0x0); /* Address: ignore in mode 3 */
> + buf[4] = cpu_to_be32(0x8); /* Data length in bytes */
> + buf[5] = cpu_to_be32(0x20010000); /* Trigger OCC attention */
> + buf[6] = 0;
> +
> + rc = sbefifo_submit(occ->sbefifo, buf, 7, buf, &resp_len);
> + if (rc)
> + goto error;
> +
> + rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_PUT_OCC_SRAM,
> + buf, resp_len, &resp_len);
> + if (rc)
> + goto error;
> +
> + if (resp_len != 1) {
> + dev_err(occ->dev, "SRAM attn response length invalid: %zd\n",
> + resp_len);
> + rc = -EBADMSG;
> + } else {
> + resp_data_len = be32_to_cpu(buf[0]);
> + if (resp_data_len != 8) {
> + dev_err(occ->dev,
> + "SRAM attn expected 8 bytes got %zd\n",
> + resp_data_len);
> + rc = -EBADMSG;
> + }
> + }
> +
> + error:
> + /* Convert positive SBEI status */
> + if (rc > 0) {
> + dev_err(occ->dev, "SRAM attn returned failure status: %08x\n",
> + rc);
> + rc = -EBADMSG;
> + }
> +
> + return rc;
> +}
> +
> +int fsi_occ_submit(struct device *dev, const void *request, size_t req_len,
> + void *response, size_t *resp_len)
> +{
> + const unsigned long timeout = msecs_to_jiffies(OCC_TIMEOUT_MS);
> + const unsigned long wait_time =
> + msecs_to_jiffies(OCC_CMD_IN_PRG_WAIT_MS);
> + struct occ *occ = dev_get_drvdata(dev);
> + struct occ_response *resp = response;
> + u16 resp_data_length;
> + unsigned long start;
> + int rc;
> +
> + if (!occ)
> + return -ENODEV;
> +
> + if (*resp_len < 7) {
> + dev_dbg(dev, "Bad resplen %zd\n", *resp_len);
> + return -EINVAL;
> + }
> +
> + mutex_lock(&occ->occ_lock);
> +
> + rc = occ_putsram(occ, OCC_SRAM_CMD_ADDR, request, req_len);
> + if (rc)
> + goto done;
> +
> + rc = occ_trigger_attn(occ);
> + if (rc)
> + goto done;
> +
> + /* Read occ response header */
> + start = jiffies;
> + do {
> + rc = occ_getsram(occ, OCC_SRAM_RSP_ADDR, resp, 8);
> + if (rc)
> + goto done;
> +
> + if (resp->return_status == OCC_RESP_CMD_IN_PRG) {
> + rc = -ETIMEDOUT;
> +
> + if (time_after(jiffies, start + timeout))
> + break;
> +
> + set_current_state(TASK_UNINTERRUPTIBLE);
> + schedule_timeout(wait_time);
> + }
> + } while (rc);
> +
> + /* Extract size of response data */
> + resp_data_length = get_unaligned_be16(&resp->data_length);
> +
> + /* Message size is data length + 5 bytes header + 2 bytes checksum */
> + if ((resp_data_length + 7) > *resp_len) {
> + rc = -EMSGSIZE;
> + goto done;
> + }
> +
> + dev_dbg(dev, "resp_status=%02x resp_data_len=%d\n",
> + resp->return_status, resp_data_length);
> +
> + /* Grab the rest */
> + if (resp_data_length > 1) {
> + /* already got 3 bytes resp, also need 2 bytes checksum */
> + rc = occ_getsram(occ, OCC_SRAM_RSP_ADDR + 8,
> + &resp->data[3], resp_data_length - 1);
> + if (rc)
> + goto done;
> + }
> +
> + *resp_len = resp_data_length + 7;
> + rc = occ_verify_checksum(resp, resp_data_length);
> +
> + done:
> + mutex_unlock(&occ->occ_lock);
> +
> + return rc;
> +}
> +EXPORT_SYMBOL_GPL(fsi_occ_submit);
> +
> +static int occ_unregister_child(struct device *dev, void *data)
> +{
> + struct platform_device *hwmon_dev = to_platform_device(dev);
> +
> + platform_device_unregister(hwmon_dev);
> +
> + return 0;
> +}
> +
> +static int occ_probe(struct platform_device *pdev)
> +{
> + int rc;
> + u32 reg;
> + struct occ *occ;
> + struct platform_device *hwmon_dev;
> + struct device *dev = &pdev->dev;
> + struct platform_device_info hwmon_dev_info = {
> + .parent = dev,
> + .name = "occ-hwmon",
> + };
> +
> + occ = devm_kzalloc(dev, sizeof(*occ), GFP_KERNEL);
> + if (!occ)
> + return -ENOMEM;
> +
> + occ->dev = dev;
> + occ->sbefifo = dev->parent;
> + mutex_init(&occ->occ_lock);
> +
> + if (dev->of_node) {
> + rc = of_property_read_u32(dev->of_node, "reg", ®);
> + if (!rc) {
> + /* make sure we don't have a duplicate from dts */
> + occ->idx = ida_simple_get(&occ_ida, reg, reg + 1,
> + GFP_KERNEL);
> + if (occ->idx < 0)
> + occ->idx = ida_simple_get(&occ_ida, 1, INT_MAX,
> + GFP_KERNEL);
> + } else {
> + occ->idx = ida_simple_get(&occ_ida, 1, INT_MAX,
> + GFP_KERNEL);
> + }
> + } else {
> + occ->idx = ida_simple_get(&occ_ida, 1, INT_MAX, GFP_KERNEL);
> + }
> +
> + platform_set_drvdata(pdev, occ);
> +
> + snprintf(occ->name, sizeof(occ->name), "occ%d", occ->idx);
> + occ->mdev.fops = &occ_fops;
> + occ->mdev.minor = MISC_DYNAMIC_MINOR;
> + occ->mdev.name = occ->name;
> + occ->mdev.parent = dev;
> +
> + rc = misc_register(&occ->mdev);
> + if (rc) {
> + dev_err(dev, "failed to register miscdevice: %d\n", rc);
> + ida_simple_remove(&occ_ida, occ->idx);
> + return rc;
> + }
> +
> + hwmon_dev_info.id = occ->idx;
> + hwmon_dev = platform_device_register_full(&hwmon_dev_info);
> + if (!hwmon_dev)
> + dev_warn(dev, "failed to create hwmon device\n");
> +
Not my call to make, but since you are using devicetree I would have
thought it would be possible to use something like of_platform_populate()
to register child drivers.
> + return 0;
> +}
> +
> +static int occ_remove(struct platform_device *pdev)
> +{
> + struct occ *occ = platform_get_drvdata(pdev);
> +
> + misc_deregister(&occ->mdev);
> +
> + device_for_each_child(&pdev->dev, NULL, occ_unregister_child);
> +
> + ida_simple_remove(&occ_ida, occ->idx);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id occ_match[] = {
> + { .compatible = "ibm,p9-occ" },
> + { },
> +};
> +
> +static struct platform_driver occ_driver = {
> + .driver = {
> + .name = "occ",
> + .of_match_table = occ_match,
> + },
> + .probe = occ_probe,
> + .remove = occ_remove,
> +};
> +
> +static int occ_init(void)
> +{
> + return platform_driver_register(&occ_driver);
> +}
> +
> +static void occ_exit(void)
> +{
> + platform_driver_unregister(&occ_driver);
> +
> + ida_destroy(&occ_ida);
> +}
> +
> +module_init(occ_init);
> +module_exit(occ_exit);
> +
> +MODULE_AUTHOR("Eddie James <eajames@xxxxxxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("BMC P9 OCC driver");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/fsi-occ.h b/include/linux/fsi-occ.h
> new file mode 100644
> index 0000000..e28cf9a
> --- /dev/null
> +++ b/include/linux/fsi-occ.h
> @@ -0,0 +1,34 @@
> +/*
> + * On-Chip Controller Driver definitions and prototypes
> + *
> + * Copyright (C) IBM Corporation 2018
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#ifndef LINUX_FSI_OCC_H
> +#define LINUX_FSI_OCC_H
> +
> +struct device;
> +
> +#define OCC_RESP_CMD_IN_PRG 0xFF
> +#define OCC_RESP_SUCCESS 0
> +#define OCC_RESP_CMD_INVAL 0x11
> +#define OCC_RESP_CMD_LEN_INVAL 0x12
> +#define OCC_RESP_DATA_INVAL 0x13
> +#define OCC_RESP_CHKSUM_ERR 0x14
> +#define OCC_RESP_INT_ERR 0x15
> +#define OCC_RESP_BAD_STATE 0x16
> +#define OCC_RESP_CRIT_EXCEPT 0xE0
> +#define OCC_RESP_CRIT_INIT 0xE1
> +#define OCC_RESP_CRIT_WATCHDOG 0xE2
> +#define OCC_RESP_CRIT_OCB 0xE3
> +#define OCC_RESP_CRIT_HW 0xE4
> +
> +int fsi_occ_submit(struct device *dev, const void *request, size_t req_len,
> + void *response, size_t *resp_len);
> +
> +#endif /* LINUX_FSI_OCC_H */
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