/*
 * Copyright (C) IBM Corporation 2017
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERGCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/device.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/fsi.h>
#include <linux/fsi-sbefifo.h>
#include <linux/idr.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/delay.h>

#define CREATE_TRACE_POINTS
#include <trace/events/sbefifo.h>

/*
 * The SBEFIFO is a pipe-like FSI device for communicating with
 * the self boot engine on POWER processors.
 */

#define DEVICE_NAME		"sbefifo"
#define FSI_ENGID_SBE		0x22

/*
 * Register layout
 */

/* Register banks */
#define SBEFIFO_UP		0x00		/* FSI -> Host */
#define SBEFIFO_DOWN		0x40		/* Host -> FSI */

/* Per-bank registers */
#define SBEFIFO_FIFO		0x00		/* The FIFO itself */
#define SBEFIFO_STS		0x04		/* Status register */
#define   SBEFIFO_STS_PARITY_ERR	0x20000000
#define   SBEFIFO_STS_RESET_REQ		0x02000000
#define   SBEFIFO_STS_GOT_EOT		0x00800000
#define   SBEFIFO_STS_MAX_XFER_LIMIT	0x00400000
#define   SBEFIFO_STS_FULL		0x00200000
#define   SBEFIFO_STS_EMPTY		0x00100000
#define   SBEFIFO_STS_ECNT_MASK		0x000f0000
#define   SBEFIFO_STS_ECNT_SHIFT	16
#define   SBEFIFO_STS_VALID_MASK	0x0000ff00
#define   SBEFIFO_STS_VALID_SHIFT	8
#define   SBEFIFO_STS_EOT_MASK		0x000000ff
#define   SBEFIFO_STS_EOT_SHIFT		0
#define SBEFIFO_EOT_RAISE	0x08		/* (Up only) Set End Of Transfer */
#define SBEFIFO_REQ_RESET	0x0C		/* (Up only) Reset Request */
#define SBEFIFO_PERFORM_RESET	0x10		/* (Down only) Perform Reset */
#define SBEFIFO_EOT_ACK		0x14		/* (Down only) Acknowledge EOT */
#define SBEFIFO_DOWN_MAX	0x18		/* (Down only) Max transfer */

/* FIFO depth */
#define SBEFIFO_FIFO_DEPTH		8

/* Helpers */
#define sbefifo_empty(sts)	((sts) & SBEFIFO_STS_EMPTY)
#define sbefifo_full(sts)	((sts) & SBEFIFO_STS_FULL)
#define sbefifo_parity_err(sts)	((sts) & SBEFIFO_STS_PARITY_ERR)
#define sbefifo_populated(sts)	(((sts) & SBEFIFO_STS_ECNT_MASK) >> SBEFIFO_STS_ECNT_SHIFT)
#define sbefifo_vacant(sts)	(SBEFIFO_FIFO_DEPTH - sbefifo_populated(sts))
#define sbefifo_eot_set(sts)	(((sts) & SBEFIFO_STS_EOT_MASK) >> SBEFIFO_STS_EOT_SHIFT)

/* Reset request timeout in ms */
#define SBEFIFO_RESET_TIMEOUT		10000

/* Range of sleep while trying to read/write the FIFO */
/* XXX Adjust these */
#define SBEFIFO_WAIT_RANGE_MIN		1
#define SBEFIFO_WAIT_RANGE_MAX		10000

/* Timeouts for commands in ms */
#define SBEFIFO_TIMEOUT_START_CMD	10000
#define SBEFIFO_TIMEOUT_IN_CMD		1000
#define SBEFIFO_TIMEOUT_START_RSP	10000
#define SBEFIFO_TIMEOUT_IN_RSP		1000

/* Other constants */
#define SBEFIFO_MAX_CMD_LEN		4096

struct sbefifo {
	uint32_t		magic;
#define SBEFIFO_MAGIC		0x53424546 /* "SBEF" */
	struct fsi_device	*fsi_dev;
	struct miscdevice	mdev;
	struct mutex		lock;
	char			name[32];
	int			idx;
	bool			broken;
};

struct sbefifo_user {
	struct sbefifo		*sbefifo;
	unsigned int 		f_flags;
	struct mutex		file_lock;
	void			*pending_cmd;
	size_t			pending_len;
};

static DEFINE_IDA(sbefifo_ida);

static int sbefifo_regr(struct sbefifo *sbefifo, int reg, u32 *word)
{
	int rc;
	__be32 raw_word;

	rc = fsi_device_read(sbefifo->fsi_dev, reg, &raw_word,
			     sizeof(raw_word));
	if (rc)
		return rc;

	*word = be32_to_cpu(raw_word);

	return 0;
}

static int sbefifo_regw(struct sbefifo *sbefifo, int reg, u32 word)
{
	__be32 raw_word = cpu_to_be32(word);

	return fsi_device_write(sbefifo->fsi_dev, reg, &raw_word,
				sizeof(raw_word));
}

/* Don't flip endianness of data to/from FIFO, just pass through. */
static int sbefifo_down_read(struct sbefifo *sbefifo, u32 *word)
{
	return fsi_device_read(sbefifo->fsi_dev, SBEFIFO_DOWN, word,
			       sizeof(*word));
}

static int sbefifo_up_write(struct sbefifo *sbefifo, u32 word)
{
	return fsi_device_write(sbefifo->fsi_dev, SBEFIFO_UP, &word,
				sizeof(word));
}

static int sbefifo_request_reset(struct sbefifo *sbefifo)
{
	struct device *dev = &sbefifo->fsi_dev->dev;
	u32 status, timeout;
	int rc;

	dev_dbg(dev, "Requesting FIFO reset\n");

	/* Mark broken first, will be cleared if reset succeeds */
	sbefifo->broken = true;

	/* Send reset request */
	rc = sbefifo_regw(sbefifo, SBEFIFO_UP | SBEFIFO_REQ_RESET, 1);
	if (rc) {
		dev_err(dev, "Sending reset request failed, rc=%d\n", rc);
		return rc;
	}

	/* Wait for it to complete */
	for (timeout = 0; timeout < SBEFIFO_RESET_TIMEOUT; timeout++) {
		rc = sbefifo_regr(sbefifo, SBEFIFO_UP | SBEFIFO_STS, &status);
		if (rc) {
			dev_err(dev, "Failed to read UP fifo status during reset"
				" , rc=%d\n", rc);
			return rc;
		}

		if (!(status & SBEFIFO_STS_RESET_REQ)) {
			dev_dbg(dev, "FIFO reset done\n");
			sbefifo->broken = false;
			return 0;
		}

		msleep(1);
	}
	dev_err(dev, "FIFO reset timed out\n");

	return -ETIMEDOUT;
}

static int sbefifo_cleanup_hw(struct sbefifo *sbefifo)
{
	struct device *dev = &sbefifo->fsi_dev->dev;
	u32 up_status, down_status;
	bool need_reset = false;
	int rc;

	rc = sbefifo_regr(sbefifo, SBEFIFO_UP | SBEFIFO_STS, &up_status);
	if (rc) {
		dev_err(dev, "Cleanup: Reading UP status failed, rc=%d\n", rc);
		return rc;
	}

	rc = sbefifo_regr(sbefifo, SBEFIFO_DOWN | SBEFIFO_STS, &down_status);
	if (rc) {
		dev_err(dev, "Cleanup: Reading DOWN status failed, rc=%d\n", rc);
		return rc;
	}

	/* The FIFO already contains a reset request from the SBE ? */
	if (down_status & SBEFIFO_STS_RESET_REQ) {
		dev_info(dev, "Cleanup: FIFO reset request set, resetting\n");
		rc = sbefifo_regw(sbefifo, SBEFIFO_UP, SBEFIFO_PERFORM_RESET);
		if (rc) {
			sbefifo->broken = true;
			dev_err(dev, "Cleanup: Reset reg write failed, rc=%d\n", rc);
			return rc;
		}
		sbefifo->broken = false;
		return 0;
	}

	/* Parity error on either FIFO ? */
	if ((up_status | down_status) & SBEFIFO_STS_PARITY_ERR)
		need_reset = true;

	/* Either FIFO not empty ? */
	if (!((up_status & down_status) & SBEFIFO_STS_EMPTY))
		need_reset = true;

	if (!sbefifo->broken && !need_reset)
		return 0;

	dev_info(dev, "Cleanup: FIFO not clean (up=0x%08x down=0x%08x broken=%d)\n",
		 up_status, down_status, sbefifo->broken);

	/* Mark broken, will be cleared if/when reset succeeds */
	return sbefifo_request_reset(sbefifo);
}

static int sbefifo_wait(struct sbefifo *sbefifo, bool up,
			u32 *status, unsigned long timeout)
{
	struct device *dev = &sbefifo->fsi_dev->dev;
	unsigned long end_time;
	bool ready = false;
	u32 addr, sts = 0;
	int rc;

	dev_vdbg(dev, "Wait on %s fifo...\n", up ? "up" : "down");

	addr = (up ? SBEFIFO_UP : SBEFIFO_DOWN) | SBEFIFO_STS;

	end_time = jiffies + timeout;
	while (!time_after(jiffies, end_time)) {
		rc = sbefifo_regr(sbefifo, addr, &sts);
		if (rc < 0) {
			dev_err(dev, "FSI error %d reading status register\n", rc);
			return rc;
		}
		if (!up && sbefifo_parity_err(sts)) {
			dev_err(dev, "Parity error in DOWN FIFO\n");
			return -ENXIO;
		}
		ready = !(up ? sbefifo_full(sts) : sbefifo_empty(sts));
		if (ready)
			break;
		cond_resched();
	}
	if (!ready) {
		dev_err(dev, "FIFO Timeout !\n");
		return -ETIMEDOUT;
	}
	dev_vdbg(dev, "End of wait status: %08x\n", sts);

	*status = sts;

	return 0;
}

static int sbefifo_send_command(struct sbefifo *sbefifo,
				const __be32 *command, size_t cmd_len)
{
	struct device *dev = &sbefifo->fsi_dev->dev;
	size_t len, chunk, vacant = 0, remaining = cmd_len;
	unsigned long timeout;
	u32 status;
	int rc;

	dev_vdbg(dev, "sending command (%d words, cmd=%04x)\n",
		 cmd_len, be32_to_cpu(command[1]));

	/* As long as there's something to send */
	timeout = msecs_to_jiffies(SBEFIFO_TIMEOUT_START_CMD);
	while (remaining) {
		/* Wait for room in the FIFO */
		rc = sbefifo_wait(sbefifo, true, &status, timeout);
		if (rc < 0)
			return rc;
		timeout = msecs_to_jiffies(SBEFIFO_TIMEOUT_IN_CMD);

		vacant = sbefifo_vacant(status);
		len = chunk = min(vacant, remaining);

		dev_vdbg(dev, "  status=%08x vacant=%d chunk=%d\n",
			 status, vacant, chunk);

		/* Write as much as we can */
		while (len--) {
			rc = sbefifo_up_write(sbefifo, *(command++));
			if (rc) {
				dev_err(dev, "FSI error %d writing UP FIFO\n", rc);
				return rc;
			}
		}
		remaining -= chunk;
		vacant -= chunk;
	}

	/* If there's no room left, wait for some to write EOT */
	if (!vacant) {
		rc = sbefifo_wait(sbefifo, true, &status, timeout);
		if (rc)
			return rc;
	}

	/* Send an EOT */
	rc = sbefifo_regw(sbefifo, SBEFIFO_UP | SBEFIFO_EOT_RAISE, 0);
	if (rc)
		dev_err(dev, "FSI error %d writing EOT\n", rc);
	return rc;
}

static int sbefifo_read_response(struct sbefifo *sbefifo,
				 __be32 __user *response, size_t *resp_len)
{
	struct device *dev = &sbefifo->fsi_dev->dev;
	u32 data, status, eot_set;
	size_t len, remaining;
	unsigned long timeout;
	bool overflow = false;
	int rc;

	remaining = *resp_len;
	*resp_len = 0;

	dev_vdbg(dev, "reading response, buflen = %d\n", remaining);

	timeout = msecs_to_jiffies(SBEFIFO_TIMEOUT_START_RSP);
	for (;;) {
		/* Grab FIFO status (this will handle parity errors) */
		rc = sbefifo_wait(sbefifo, false, &status, timeout);
		if (rc < 0)
			return rc;
		timeout = msecs_to_jiffies(SBEFIFO_TIMEOUT_IN_RSP);

		/* Decode status */
		len = sbefifo_populated(status);
		eot_set = sbefifo_eot_set(status);

		dev_vdbg(dev, "  chunk size %d eot_set=0x%x\n", len, eot_set);

		/* Go through the chunk */
		while(len--) {
			/* Read the data */
			rc = sbefifo_down_read(sbefifo, &data);
			if (rc < 0)
				return rc;

			/* Was it an EOT ? */
			if (eot_set & 0x80) {
				/*
				 * There should be nothing else in the FIFO,
				 * if there is, mark broken, this will force
				 * a reset on next use, but don't fail the
				 * command.
				 */
				if (len) {
					dev_warn(dev, "FIFO read hit"
						 " EOT with still %d data\n",
						 len);
					sbefifo->broken = true;
				}

				/* We are done */
				rc = sbefifo_regw(sbefifo,
						  SBEFIFO_DOWN | SBEFIFO_EOT_ACK, 0);

				/*
				 * If that write fail, still complete the request but mark
				 * the fifo as broken for subsequent reset (not much else
				 * we can do here).
				 */
				if (rc) {
					dev_err(dev, "FSI error %d ack'ing EOT\n", rc);
					sbefifo->broken = true;
				}

				dev_vdbg(dev, "got %d words response%s\n", *resp_len,
					 overflow ? "with overflow !" : "");

				/* Tell whether we overflowed */
				return overflow ? -EOVERFLOW : 0;
			}

			/* Store it if there is room */
			if (remaining) {
				rc = put_user(data, response++);
				if (rc)
					return rc;
				remaining--;
				(*resp_len)++;
			} else
				overflow = true;

			/* Next EOT bit */
			eot_set <<= 1;
		}
	}
	/* Shouldn't happen */
	return -EIO;
}

static int __sbefifo_submit(struct sbefifo *sbefifo,
			    const __be32 *command, size_t cmd_len,
			    __be32 __user *response, size_t *resp_len)
{
	struct device *dev = &sbefifo->fsi_dev->dev;
	int rc;

	if (cmd_len < 2 || be32_to_cpu(command[0]) != cmd_len) {
		dev_vdbg(dev, "Invalid command len %d (header: %d)\n",
			 cmd_len, be32_to_cpu(command[0]));
		return -EINVAL;
	}

	/* First ensure the HW is in a clean state */
	rc = sbefifo_cleanup_hw(sbefifo);
	if (rc)
		return rc;

	/* Try sending the command */
	rc = sbefifo_send_command(sbefifo, command, cmd_len);
	if (rc)
		goto fail;

	/* Now, get the response */
	rc = sbefifo_read_response(sbefifo, response, resp_len);
	if (rc != 0 && rc != -EOVERFLOW)
		goto fail;
	return rc;
 fail:
	/*
	 * On failure, attempt a reset. Ignore the result, it will mark
	 * the fifo broken if the reset fails
	 */
        sbefifo_request_reset(sbefifo);

	/* Return original error */
	return rc;
}

/**
 * sbefifo_submit() - Submit and SBE fifo command and receive response
 * @dev: The sbefifo device
 * @command: The raw command data
 * @cmd_len: The command size (in 32-bit words)
 * @response: The output response buffer
 * @resp_len: In: Response buffer size, Out: Response size
 *
 * This will perform the entire operation. If the reponse buffer
 * overflows, returns -EOVERFLOW
 */
int sbefifo_submit(struct device *dev, const __be32 *command, size_t cmd_len,
		   __be32 *response, size_t *resp_len)
{
	struct sbefifo *sbefifo = dev_get_drvdata(dev);
	mm_segment_t old_fs;
	int rc;

	if (!dev || !sbefifo)
		return -ENODEV;
	if (WARN_ON_ONCE(sbefifo->magic != SBEFIFO_MAGIC))
		return -ENODEV;
	if (!resp_len || !command || !response || cmd_len > SBEFIFO_MAX_CMD_LEN)
		return -EINVAL;

	mutex_lock(&sbefifo->lock);
	old_fs = get_fs();
	set_fs(KERNEL_DS);
	rc = __sbefifo_submit(sbefifo, command, cmd_len,
			      response, resp_len);
	set_fs(old_fs);
	mutex_unlock(&sbefifo->lock);
	return rc;
}
EXPORT_SYMBOL_GPL(sbefifo_submit);

int sbefifo_parse_status(u16 cmd, __be32 *response, size_t resp_len, size_t *data_len)
{
	u32 dh, s0, s1;

	if (resp_len < 3) {
		pr_debug("sbefifo: cmd %04x, response too small: %d\n",
			 cmd, resp_len);
		return -ENXIO;
	}
	dh = be32_to_cpu(response[resp_len - 1]);
	if (dh > resp_len || dh < 3) {
		pr_debug("sbefifo: cmd %04x, status offset out of range: %d/%d\n",
			 cmd, dh, resp_len);
		return -ENXIO;
	}
	s0 = be32_to_cpu(response[resp_len - dh]);
	s1 = be32_to_cpu(response[resp_len - dh + 1]);
	if (((s0 >> 16) != 0xC0DE) || ((s0 & 0xffff) != cmd)) {
		pr_debug("sbefifo: cmd %04x, status signature invalid: 0x%08x 0x%08x\n",
			 cmd, s0, s1);
		return -ENXIO;
	}
	if (s1 != 0) {
		pr_debug("sbefifo: cmd %04x, error status: prim=%04x sec=%04x\n",
			 cmd, s1 >> 16, s1 & 0xffff);
	}
	if (data_len)
		*data_len = resp_len - dh;

	/*
	 * Primary status don't have the top bit set, so can't be confused with
	 * Linux negative error codes, so return the status word whole.
	 */
	return s1;
}
EXPORT_SYMBOL_GPL(sbefifo_parse_status);

/*
 * Char device interface
 */
static int sbefifo_user_open(struct inode *inode, struct file *file)
{
	struct sbefifo *sbefifo = container_of(file->private_data,
					       struct sbefifo, mdev);
	struct sbefifo_user *user;

	user = kzalloc(sizeof(struct sbefifo_user), GFP_KERNEL);
	if (!user)
		return -ENOMEM;

	file->private_data = user;
	user->sbefifo = sbefifo;
	user->f_flags = file->f_flags;
	mutex_init(&user->file_lock);

	return 0;
}

static ssize_t sbefifo_user_read(struct file *file, char __user *buf,
				 size_t len, loff_t *offset)
{
	struct sbefifo_user *user = file->private_data;
	struct sbefifo *sbefifo;
	size_t rlen;
	int rc;

	if (len & 3)
		return -EINVAL;

	mutex_lock(&user->file_lock);
	sbefifo = user->sbefifo;

	/* No command ? Ugh... */
	if (!user->pending_cmd) {
		rc = -ENXIO;
		goto bail;
	}

	mutex_lock(&sbefifo->lock);
	rlen = len >> 2;
	rc = __sbefifo_submit(sbefifo, user->pending_cmd,
			      user->pending_len >> 2,
			      (__be32 __user *)buf, &rlen);
	mutex_unlock(&sbefifo->lock);
	if (rc < 0)
		goto bail;
	rc = rlen << 2;
 bail:
	kfree(user->pending_cmd);
	user->pending_len = 0;
	mutex_unlock(&user->file_lock);
	return rc;
}

static ssize_t sbefifo_user_write(struct file *file, const char __user *buf,
				  size_t len, loff_t *offset)
{
	struct sbefifo_user *user = file->private_data;
	void *cmd_ptr;
	size_t cmd_len;
	int rc = len;

	if (!user)
		return -EINVAL;
	if (len > SBEFIFO_MAX_CMD_LEN)
		return -EINVAL;
	if (len & 3)
		return -EINVAL;

	/* XXX Add special "reset" command */

	/* If we already have a command, append to it, otherwise copy it over */
	mutex_lock(&user->file_lock);
	cmd_ptr = user->pending_cmd;
	if (cmd_ptr) {
		cmd_len = user->pending_len + len;
		if (cmd_len > SBEFIFO_MAX_CMD_LEN) {
			rc = -EINVAL;
			goto bail;
		}
		user->pending_cmd = krealloc(cmd_ptr, cmd_len, GFP_KERNEL);
		cmd_ptr = user->pending_cmd + user->pending_len;
	} else {
		cmd_len = len;
		user->pending_cmd = cmd_ptr = kmalloc(len, GFP_KERNEL);
	}
	if (!user->pending_cmd) {
		rc = -ENOMEM;
		goto bail;
	}
	user->pending_len = cmd_len;

	/* Copy the user data */
	if (copy_from_user(cmd_ptr, buf, len))
		rc = -EFAULT;
	else
		rc = len;
 bail:
	mutex_unlock(&user->file_lock);

	/* And that's it, we'll issue the command on a read */
	return rc;
}

static int sbefifo_user_release(struct inode *inode, struct file *file)
{
	struct sbefifo_user *user = file->private_data;

	kfree(user);
	return 0;
}

static const struct file_operations sbefifo_fops = {
	.owner		= THIS_MODULE,
	.open		= sbefifo_user_open,
	.read		= sbefifo_user_read,
	.write		= sbefifo_user_write,
	.release	= sbefifo_user_release,
};

/*
 * Probe/remove
 */

static int sbefifo_probe(struct device *dev)
{
	struct fsi_device *fsi_dev = to_fsi_dev(dev);
	struct sbefifo *sbefifo;
	struct device_node *np;
	struct platform_device *child;
	char child_name[32];
	int rc, child_idx = 0;

	dev_dbg(dev, "Found sbefifo device\n");

	sbefifo = devm_kzalloc(dev, sizeof(*sbefifo), GFP_KERNEL);
	if (!sbefifo)
		return -ENOMEM;
	sbefifo->magic = SBEFIFO_MAGIC;
	sbefifo->fsi_dev = fsi_dev;
	mutex_init(&sbefifo->lock);

	rc = sbefifo_cleanup_hw(sbefifo);
	if (rc) {
		dev_err(dev, "Initial HW cleanup failed, rc=%d !\n", rc);
		return rc;
	}

	sbefifo->idx = ida_simple_get(&sbefifo_ida, 1, INT_MAX, GFP_KERNEL);
	snprintf(sbefifo->name, sizeof(sbefifo->name), "sbefifo%d",
		 sbefifo->idx);

	dev_set_drvdata(dev, sbefifo);

	/* Create misc chardev for userspace access */
	sbefifo->mdev.minor = MISC_DYNAMIC_MINOR;
	sbefifo->mdev.fops = &sbefifo_fops;
	sbefifo->mdev.name = sbefifo->name;
	sbefifo->mdev.parent = dev;
	rc = misc_register(&sbefifo->mdev);
	if (rc) {
		dev_err(dev, "Failed to register miscdevice: %d\n", rc);
		ida_simple_remove(&sbefifo_ida, sbefifo->idx);
		return rc;
	}

	/* Create platform devs for dts child nodes (occ, etc) */
	for_each_available_child_of_node(dev->of_node, np) {
		snprintf(child_name, sizeof(child_name), "%s-dev%d",
			 sbefifo->name, child_idx++);
		child = of_platform_device_create(np, child_name, dev);
		if (!child)
			dev_warn(dev, "failed to create child %s dev\n",
				 child_name);
	}

	return 0;
}

static int sbefifo_unregister_child(struct device *dev, void *data)
{
	struct platform_device *child = to_platform_device(dev);

	of_device_unregister(child);
	if (dev->of_node)
		of_node_clear_flag(dev->of_node, OF_POPULATED);

	return 0;
}

static int sbefifo_remove(struct device *dev)
{
	struct sbefifo *sbefifo = dev_get_drvdata(dev);

	dev_dbg(dev, "Removing sbefifo device...\n");

	misc_deregister(&sbefifo->mdev);
	device_for_each_child(dev, NULL, sbefifo_unregister_child);

	ida_simple_remove(&sbefifo_ida, sbefifo->idx);

	return 0;
}

static struct fsi_device_id sbefifo_ids[] = {
	{
		.engine_type = FSI_ENGID_SBE,
		.version = FSI_VERSION_ANY,
	},
	{ 0 }
};

static struct fsi_driver sbefifo_drv = {
	.id_table = sbefifo_ids,
	.drv = {
		.name = DEVICE_NAME,
		.bus = &fsi_bus_type,
		.probe = sbefifo_probe,
		.remove = sbefifo_remove,
	}
};

static int sbefifo_init(void)
{
	return fsi_driver_register(&sbefifo_drv);
}

static void sbefifo_exit(void)
{
	fsi_driver_unregister(&sbefifo_drv);

	ida_destroy(&sbefifo_ida);
}

module_init(sbefifo_init);
module_exit(sbefifo_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Brad Bishop <bradleyb@fuzziesquirrel.com>");
MODULE_AUTHOR("Eddie James <eajames@linux.vnet.ibm.com>");
MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>");
MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
MODULE_DESCRIPTION("Linux device interface to the POWER Self Boot Engine");