[deliverable/linux.git] / drivers / char / tpm / tpm_ibmvtpm.c

/*
 * Copyright (C) 2012 IBM Corporation
 *
 * Author: Ashley Lai <ashleydlai@gmail.com>
 *
 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
 *
 * Device driver for TCG/TCPA TPM (trusted platform module).
 * Specifications at www.trustedcomputinggroup.org
 *
 * 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, version 2 of the
 * License.
 *
 */

#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/slab.h>
#include <asm/vio.h>
#include <asm/irq.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <asm/prom.h>

#include "tpm.h"
#include "tpm_ibmvtpm.h"

static const char tpm_ibmvtpm_driver_name[] = "tpm_ibmvtpm";

static struct vio_device_id tpm_ibmvtpm_device_table[] = {
	{ "IBM,vtpm", "IBM,vtpm"},
	{ "", "" }
};
MODULE_DEVICE_TABLE(vio, tpm_ibmvtpm_device_table);

/**
 * ibmvtpm_send_crq - Send a CRQ request
 * @vdev:	vio device struct
 * @w1:		first word
 * @w2:		second word
 *
 * Return value:
 *	0 -Sucess
 *	Non-zero - Failure
 */
static int ibmvtpm_send_crq(struct vio_dev *vdev, u64 w1, u64 w2)
{
	return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, w1, w2);
}

/**
 * ibmvtpm_get_data - Retrieve ibm vtpm data
 * @dev:	device struct
 *
 * Return value:
 *	vtpm device struct
 */
static struct ibmvtpm_dev *ibmvtpm_get_data(const struct device *dev)
{
	struct tpm_chip *chip = dev_get_drvdata(dev);
	if (chip)
		return (struct ibmvtpm_dev *)TPM_VPRIV(chip);
	return NULL;
}

/**
 * tpm_ibmvtpm_recv - Receive data after send
 * @chip:	tpm chip struct
 * @buf:	buffer to read
 * count:	size of buffer
 *
 * Return value:
 *	Number of bytes read
 */
static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count)
{
	struct ibmvtpm_dev *ibmvtpm;
	u16 len;
	int sig;

	ibmvtpm = (struct ibmvtpm_dev *)TPM_VPRIV(chip);

	if (!ibmvtpm->rtce_buf) {
		dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n");
		return 0;
	}

	sig = wait_event_interruptible(ibmvtpm->wq, ibmvtpm->res_len != 0);
	if (sig)
		return -EINTR;

	len = ibmvtpm->res_len;

	if (count < len) {
		dev_err(ibmvtpm->dev,
			"Invalid size in recv: count=%zd, crq_size=%d\n",
			count, len);
		return -EIO;
	}

	spin_lock(&ibmvtpm->rtce_lock);
	memcpy((void *)buf, (void *)ibmvtpm->rtce_buf, len);
	memset(ibmvtpm->rtce_buf, 0, len);
	ibmvtpm->res_len = 0;
	spin_unlock(&ibmvtpm->rtce_lock);
	return len;
}

/**
 * tpm_ibmvtpm_send - Send tpm request
 * @chip:	tpm chip struct
 * @buf:	buffer contains data to send
 * count:	size of buffer
 *
 * Return value:
 *	Number of bytes sent
 */
static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
{
	struct ibmvtpm_dev *ibmvtpm;
	struct ibmvtpm_crq crq;
	u64 *word = (u64 *) &crq;
	int rc;

	ibmvtpm = (struct ibmvtpm_dev *)TPM_VPRIV(chip);

	if (!ibmvtpm->rtce_buf) {
		dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n");
		return 0;
	}

	if (count > ibmvtpm->rtce_size) {
		dev_err(ibmvtpm->dev,
			"Invalid size in send: count=%zd, rtce_size=%d\n",
			count, ibmvtpm->rtce_size);
		return -EIO;
	}

	spin_lock(&ibmvtpm->rtce_lock);
	memcpy((void *)ibmvtpm->rtce_buf, (void *)buf, count);
	crq.valid = (u8)IBMVTPM_VALID_CMD;
	crq.msg = (u8)VTPM_TPM_COMMAND;
	crq.len = (u16)count;
	crq.data = ibmvtpm->rtce_dma_handle;

	rc = ibmvtpm_send_crq(ibmvtpm->vdev, word[0], word[1]);
	if (rc != H_SUCCESS) {
		dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed rc=%d\n", rc);
		rc = 0;
	} else
		rc = count;

	spin_unlock(&ibmvtpm->rtce_lock);
	return rc;
}

static void tpm_ibmvtpm_cancel(struct tpm_chip *chip)
{
	return;
}

static u8 tpm_ibmvtpm_status(struct tpm_chip *chip)
{
	return 0;
}

/**
 * ibmvtpm_crq_get_rtce_size - Send a CRQ request to get rtce size
 * @ibmvtpm:	vtpm device struct
 *
 * Return value:
 *	0 - Success
 *	Non-zero - Failure
 */
static int ibmvtpm_crq_get_rtce_size(struct ibmvtpm_dev *ibmvtpm)
{
	struct ibmvtpm_crq crq;
	u64 *buf = (u64 *) &crq;
	int rc;

	crq.valid = (u8)IBMVTPM_VALID_CMD;
	crq.msg = (u8)VTPM_GET_RTCE_BUFFER_SIZE;

	rc = ibmvtpm_send_crq(ibmvtpm->vdev, buf[0], buf[1]);
	if (rc != H_SUCCESS)
		dev_err(ibmvtpm->dev,
			"ibmvtpm_crq_get_rtce_size failed rc=%d\n", rc);

	return rc;
}

/**
 * ibmvtpm_crq_get_version - Send a CRQ request to get vtpm version
 *			   - Note that this is vtpm version and not tpm version
 * @ibmvtpm:	vtpm device struct
 *
 * Return value:
 *	0 - Success
 *	Non-zero - Failure
 */
static int ibmvtpm_crq_get_version(struct ibmvtpm_dev *ibmvtpm)
{
	struct ibmvtpm_crq crq;
	u64 *buf = (u64 *) &crq;
	int rc;

	crq.valid = (u8)IBMVTPM_VALID_CMD;
	crq.msg = (u8)VTPM_GET_VERSION;

	rc = ibmvtpm_send_crq(ibmvtpm->vdev, buf[0], buf[1]);
	if (rc != H_SUCCESS)
		dev_err(ibmvtpm->dev,
			"ibmvtpm_crq_get_version failed rc=%d\n", rc);

	return rc;
}

/**
 * ibmvtpm_crq_send_init_complete - Send a CRQ initialize complete message
 * @ibmvtpm:	vtpm device struct
 *
 * Return value:
 *	0 - Success
 *	Non-zero - Failure
 */
static int ibmvtpm_crq_send_init_complete(struct ibmvtpm_dev *ibmvtpm)
{
	int rc;

	rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_COMP_CMD, 0);
	if (rc != H_SUCCESS)
		dev_err(ibmvtpm->dev,
			"ibmvtpm_crq_send_init_complete failed rc=%d\n", rc);

	return rc;
}

/**
 * ibmvtpm_crq_send_init - Send a CRQ initialize message
 * @ibmvtpm:	vtpm device struct
 *
 * Return value:
 *	0 - Success
 *	Non-zero - Failure
 */
static int ibmvtpm_crq_send_init(struct ibmvtpm_dev *ibmvtpm)
{
	int rc;

	rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_CMD, 0);
	if (rc != H_SUCCESS)
		dev_err(ibmvtpm->dev,
			"ibmvtpm_crq_send_init failed rc=%d\n", rc);

	return rc;
}

/**
 * tpm_ibmvtpm_remove - ibm vtpm remove entry point
 * @vdev:	vio device struct
 *
 * Return value:
 *	0
 */
static int tpm_ibmvtpm_remove(struct vio_dev *vdev)
{
	struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
	struct tpm_chip *chip = dev_get_drvdata(ibmvtpm->dev);
	int rc = 0;

	tpm_chip_unregister(chip);

	free_irq(vdev->irq, ibmvtpm);

	do {
		if (rc)
			msleep(100);
		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));

	dma_unmap_single(ibmvtpm->dev, ibmvtpm->crq_dma_handle,
			 CRQ_RES_BUF_SIZE, DMA_BIDIRECTIONAL);
	free_page((unsigned long)ibmvtpm->crq_queue.crq_addr);

	if (ibmvtpm->rtce_buf) {
		dma_unmap_single(ibmvtpm->dev, ibmvtpm->rtce_dma_handle,
				 ibmvtpm->rtce_size, DMA_BIDIRECTIONAL);
		kfree(ibmvtpm->rtce_buf);
	}

	kfree(ibmvtpm);

	return 0;
}

/**
 * tpm_ibmvtpm_get_desired_dma - Get DMA size needed by this driver
 * @vdev:	vio device struct
 *
 * Return value:
 *	Number of bytes the driver needs to DMA map
 */
static unsigned long tpm_ibmvtpm_get_desired_dma(struct vio_dev *vdev)
{
	struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);

	/* ibmvtpm initializes at probe time, so the data we are
	* asking for may not be set yet. Estimate that 4K required
	* for TCE-mapped buffer in addition to CRQ.
	*/
	if (!ibmvtpm)
		return CRQ_RES_BUF_SIZE + PAGE_SIZE;

	return CRQ_RES_BUF_SIZE + ibmvtpm->rtce_size;
}

/**
 * tpm_ibmvtpm_suspend - Suspend
 * @dev:	device struct
 *
 * Return value:
 *	0
 */
static int tpm_ibmvtpm_suspend(struct device *dev)
{
	struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
	struct ibmvtpm_crq crq;
	u64 *buf = (u64 *) &crq;
	int rc = 0;

	crq.valid = (u8)IBMVTPM_VALID_CMD;
	crq.msg = (u8)VTPM_PREPARE_TO_SUSPEND;

	rc = ibmvtpm_send_crq(ibmvtpm->vdev, buf[0], buf[1]);
	if (rc != H_SUCCESS)
		dev_err(ibmvtpm->dev,
			"tpm_ibmvtpm_suspend failed rc=%d\n", rc);

	return rc;
}

/**
 * ibmvtpm_reset_crq - Reset CRQ
 * @ibmvtpm:	ibm vtpm struct
 *
 * Return value:
 *	0 - Success
 *	Non-zero - Failure
 */
static int ibmvtpm_reset_crq(struct ibmvtpm_dev *ibmvtpm)
{
	int rc = 0;

	do {
		if (rc)
			msleep(100);
		rc = plpar_hcall_norets(H_FREE_CRQ,
					ibmvtpm->vdev->unit_address);
	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));

	memset(ibmvtpm->crq_queue.crq_addr, 0, CRQ_RES_BUF_SIZE);
	ibmvtpm->crq_queue.index = 0;

	return plpar_hcall_norets(H_REG_CRQ, ibmvtpm->vdev->unit_address,
				  ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
}

/**
 * tpm_ibmvtpm_resume - Resume from suspend
 * @dev:	device struct
 *
 * Return value:
 *	0
 */
static int tpm_ibmvtpm_resume(struct device *dev)
{
	struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
	int rc = 0;

	do {
		if (rc)
			msleep(100);
		rc = plpar_hcall_norets(H_ENABLE_CRQ,
					ibmvtpm->vdev->unit_address);
	} while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));

	if (rc) {
		dev_err(dev, "Error enabling ibmvtpm rc=%d\n", rc);
		return rc;
	}

	rc = vio_enable_interrupts(ibmvtpm->vdev);
	if (rc) {
		dev_err(dev, "Error vio_enable_interrupts rc=%d\n", rc);
		return rc;
	}

	rc = ibmvtpm_crq_send_init(ibmvtpm);
	if (rc)
		dev_err(dev, "Error send_init rc=%d\n", rc);

	return rc;
}

static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status)
{
	return (status == 0);
}

static const struct tpm_class_ops tpm_ibmvtpm = {
	.recv = tpm_ibmvtpm_recv,
	.send = tpm_ibmvtpm_send,
	.cancel = tpm_ibmvtpm_cancel,
	.status = tpm_ibmvtpm_status,
	.req_complete_mask = 0,
	.req_complete_val = 0,
	.req_canceled = tpm_ibmvtpm_req_canceled,
};

static const struct dev_pm_ops tpm_ibmvtpm_pm_ops = {
	.suspend = tpm_ibmvtpm_suspend,
	.resume = tpm_ibmvtpm_resume,
};

/**
 * ibmvtpm_crq_get_next - Get next responded crq
 * @ibmvtpm	vtpm device struct
 *
 * Return value:
 *	vtpm crq pointer
 */
static struct ibmvtpm_crq *ibmvtpm_crq_get_next(struct ibmvtpm_dev *ibmvtpm)
{
	struct ibmvtpm_crq_queue *crq_q = &ibmvtpm->crq_queue;
	struct ibmvtpm_crq *crq = &crq_q->crq_addr[crq_q->index];

	if (crq->valid & VTPM_MSG_RES) {
		if (++crq_q->index == crq_q->num_entry)
			crq_q->index = 0;
		smp_rmb();
	} else
		crq = NULL;
	return crq;
}

/**
 * ibmvtpm_crq_process - Process responded crq
 * @crq		crq to be processed
 * @ibmvtpm	vtpm device struct
 *
 * Return value:
 *	Nothing
 */
static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq,
				struct ibmvtpm_dev *ibmvtpm)
{
	int rc = 0;

	switch (crq->valid) {
	case VALID_INIT_CRQ:
		switch (crq->msg) {
		case INIT_CRQ_RES:
			dev_info(ibmvtpm->dev, "CRQ initialized\n");
			rc = ibmvtpm_crq_send_init_complete(ibmvtpm);
			if (rc)
				dev_err(ibmvtpm->dev, "Unable to send CRQ init complete rc=%d\n", rc);
			return;
		case INIT_CRQ_COMP_RES:
			dev_info(ibmvtpm->dev,
				 "CRQ initialization completed\n");
			return;
		default:
			dev_err(ibmvtpm->dev, "Unknown crq message type: %d\n", crq->msg);
			return;
		}
	case IBMVTPM_VALID_CMD:
		switch (crq->msg) {
		case VTPM_GET_RTCE_BUFFER_SIZE_RES:
			if (crq->len <= 0) {
				dev_err(ibmvtpm->dev, "Invalid rtce size\n");
				return;
			}
			ibmvtpm->rtce_size = crq->len;
			ibmvtpm->rtce_buf = kmalloc(ibmvtpm->rtce_size,
						    GFP_KERNEL);
			if (!ibmvtpm->rtce_buf) {
				dev_err(ibmvtpm->dev, "Failed to allocate memory for rtce buffer\n");
				return;
			}

			ibmvtpm->rtce_dma_handle = dma_map_single(ibmvtpm->dev,
				ibmvtpm->rtce_buf, ibmvtpm->rtce_size,
				DMA_BIDIRECTIONAL);

			if (dma_mapping_error(ibmvtpm->dev,
					      ibmvtpm->rtce_dma_handle)) {
				kfree(ibmvtpm->rtce_buf);
				ibmvtpm->rtce_buf = NULL;
				dev_err(ibmvtpm->dev, "Failed to dma map rtce buffer\n");
			}

			return;
		case VTPM_GET_VERSION_RES:
			ibmvtpm->vtpm_version = crq->data;
			return;
		case VTPM_TPM_COMMAND_RES:
			/* len of the data in rtce buffer */
			ibmvtpm->res_len = crq->len;
			wake_up_interruptible(&ibmvtpm->wq);
			return;
		default:
			return;
		}
	}
	return;
}

/**
 * ibmvtpm_interrupt -	Interrupt handler
 * @irq:		irq number to handle
 * @vtpm_instance:	vtpm that received interrupt
 *
 * Returns:
 *	IRQ_HANDLED
 **/
static irqreturn_t ibmvtpm_interrupt(int irq, void *vtpm_instance)
{
	struct ibmvtpm_dev *ibmvtpm = (struct ibmvtpm_dev *) vtpm_instance;
	struct ibmvtpm_crq *crq;

	/* while loop is needed for initial setup (get version and
	 * get rtce_size). There should be only one tpm request at any
	 * given time.
	 */
	while ((crq = ibmvtpm_crq_get_next(ibmvtpm)) != NULL) {
		ibmvtpm_crq_process(crq, ibmvtpm);
		crq->valid = 0;
		smp_wmb();
	}

	return IRQ_HANDLED;
}

/**
 * tpm_ibmvtpm_probe - ibm vtpm initialize entry point
 * @vio_dev:	vio device struct
 * @id:		vio device id struct
 *
 * Return value:
 *	0 - Success
 *	Non-zero - Failure
 */
static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
				   const struct vio_device_id *id)
{
	struct ibmvtpm_dev *ibmvtpm;
	struct device *dev = &vio_dev->dev;
	struct ibmvtpm_crq_queue *crq_q;
	struct tpm_chip *chip;
	int rc = -ENOMEM, rc1;

	chip = tpmm_chip_alloc(dev, &tpm_ibmvtpm);
	if (IS_ERR(chip))
		return PTR_ERR(chip);

	ibmvtpm = kzalloc(sizeof(struct ibmvtpm_dev), GFP_KERNEL);
	if (!ibmvtpm) {
		dev_err(dev, "kzalloc for ibmvtpm failed\n");
		goto cleanup;
	}

	crq_q = &ibmvtpm->crq_queue;
	crq_q->crq_addr = (struct ibmvtpm_crq *)get_zeroed_page(GFP_KERNEL);
	if (!crq_q->crq_addr) {
		dev_err(dev, "Unable to allocate memory for crq_addr\n");
		goto cleanup;
	}

	crq_q->num_entry = CRQ_RES_BUF_SIZE / sizeof(*crq_q->crq_addr);
	ibmvtpm->crq_dma_handle = dma_map_single(dev, crq_q->crq_addr,
						 CRQ_RES_BUF_SIZE,
						 DMA_BIDIRECTIONAL);

	if (dma_mapping_error(dev, ibmvtpm->crq_dma_handle)) {
		dev_err(dev, "dma mapping failed\n");
		goto cleanup;
	}

	rc = plpar_hcall_norets(H_REG_CRQ, vio_dev->unit_address,
				ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
	if (rc == H_RESOURCE)
		rc = ibmvtpm_reset_crq(ibmvtpm);

	if (rc) {
		dev_err(dev, "Unable to register CRQ rc=%d\n", rc);
		goto reg_crq_cleanup;
	}

	rc = request_irq(vio_dev->irq, ibmvtpm_interrupt, 0,
			 tpm_ibmvtpm_driver_name, ibmvtpm);
	if (rc) {
		dev_err(dev, "Error %d register irq 0x%x\n", rc, vio_dev->irq);
		goto init_irq_cleanup;
	}

	rc = vio_enable_interrupts(vio_dev);
	if (rc) {
		dev_err(dev, "Error %d enabling interrupts\n", rc);
		goto init_irq_cleanup;
	}

	init_waitqueue_head(&ibmvtpm->wq);

	crq_q->index = 0;

	ibmvtpm->dev = dev;
	ibmvtpm->vdev = vio_dev;
	TPM_VPRIV(chip) = (void *)ibmvtpm;

	spin_lock_init(&ibmvtpm->rtce_lock);

	rc = ibmvtpm_crq_send_init(ibmvtpm);
	if (rc)
		goto init_irq_cleanup;

	rc = ibmvtpm_crq_get_version(ibmvtpm);
	if (rc)
		goto init_irq_cleanup;

	rc = ibmvtpm_crq_get_rtce_size(ibmvtpm);
	if (rc)
		goto init_irq_cleanup;

	return tpm_chip_register(chip);
init_irq_cleanup:
	do {
		rc1 = plpar_hcall_norets(H_FREE_CRQ, vio_dev->unit_address);
	} while (rc1 == H_BUSY || H_IS_LONG_BUSY(rc1));
reg_crq_cleanup:
	dma_unmap_single(dev, ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE,
			 DMA_BIDIRECTIONAL);
cleanup:
	if (ibmvtpm) {
		if (crq_q->crq_addr)
			free_page((unsigned long)crq_q->crq_addr);
		kfree(ibmvtpm);
	}

	return rc;
}

static struct vio_driver ibmvtpm_driver = {
	.id_table	 = tpm_ibmvtpm_device_table,
	.probe		 = tpm_ibmvtpm_probe,
	.remove		 = tpm_ibmvtpm_remove,
	.get_desired_dma = tpm_ibmvtpm_get_desired_dma,
	.name		 = tpm_ibmvtpm_driver_name,
	.pm		 = &tpm_ibmvtpm_pm_ops,
};

/**
 * ibmvtpm_module_init - Initialize ibm vtpm module
 *
 * Return value:
 *	0 -Success
 *	Non-zero - Failure
 */
static int __init ibmvtpm_module_init(void)
{
	return vio_register_driver(&ibmvtpm_driver);
}

/**
 * ibmvtpm_module_exit - Teardown ibm vtpm module
 *
 * Return value:
 *	Nothing
 */
static void __exit ibmvtpm_module_exit(void)
{
	vio_unregister_driver(&ibmvtpm_driver);
}

module_init(ibmvtpm_module_init);
module_exit(ibmvtpm_module_exit);

MODULE_AUTHOR("adlai@us.ibm.com");
MODULE_DESCRIPTION("IBM vTPM Driver");
MODULE_VERSION("1.0");
MODULE_LICENSE("GPL");
Commit	Line	Data
132f7629 AL	1	/*
	2	* Copyright (C) 2012 IBM Corporation
	3	*
1a0f1b27	4	* Author: Ashley Lai <ashleydlai@gmail.com>
132f7629 AL	5	*
	6	* Maintained by: <tpmdd-devel@lists.sourceforge.net>
	7	*
	8	* Device driver for TCG/TCPA TPM (trusted platform module).
	9	* Specifications at www.trustedcomputinggroup.org
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License as
	13	* published by the Free Software Foundation, version 2 of the
	14	* License.
	15	*
	16	*/
	17
	18	#include <linux/dma-mapping.h>
	19	#include <linux/dmapool.h>
	20	#include <linux/slab.h>
	21	#include <asm/vio.h>
	22	#include <asm/irq.h>
	23	#include <linux/types.h>
	24	#include <linux/list.h>
	25	#include <linux/spinlock.h>
	26	#include <linux/interrupt.h>
	27	#include <linux/wait.h>
	28	#include <asm/prom.h>
	29
	30	#include "tpm.h"
	31	#include "tpm_ibmvtpm.h"
	32
	33	static const char tpm_ibmvtpm_driver_name[] = "tpm_ibmvtpm";
	34
0bbed20e	35	static struct vio_device_id tpm_ibmvtpm_device_table[] = {
132f7629 AL	36	{ "IBM,vtpm", "IBM,vtpm"},
	37	{ "", "" }
	38	};
	39	MODULE_DEVICE_TABLE(vio, tpm_ibmvtpm_device_table);
	40
132f7629 AL	41	/**
	42	* ibmvtpm_send_crq - Send a CRQ request
	43	* @vdev: vio device struct
	44	* @w1: first word
	45	* @w2: second word
	46	*
	47	* Return value:
	48	* 0 -Sucess
	49	* Non-zero - Failure
	50	*/
	51	static int ibmvtpm_send_crq(struct vio_dev *vdev, u64 w1, u64 w2)
	52	{
	53	return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, w1, w2);
	54	}
	55
	56	/**
	57	* ibmvtpm_get_data - Retrieve ibm vtpm data
	58	* @dev: device struct
	59	*
	60	* Return value:
	61	* vtpm device struct
	62	*/
	63	static struct ibmvtpm_dev ibmvtpm_get_data(const struct device dev)
	64	{
	65	struct tpm_chip *chip = dev_get_drvdata(dev);
	66	if (chip)
775585e4	67	return (struct ibmvtpm_dev *)TPM_VPRIV(chip);
132f7629 AL	68	return NULL;
	69	}
	70
	71	/**
	72	* tpm_ibmvtpm_recv - Receive data after send
	73	* @chip: tpm chip struct
	74	* @buf: buffer to read
	75	* count: size of buffer
	76	*
	77	* Return value:
	78	* Number of bytes read
	79	*/
	80	static int tpm_ibmvtpm_recv(struct tpm_chip chip, u8 buf, size_t count)
	81	{
	82	struct ibmvtpm_dev *ibmvtpm;
	83	u16 len;
b5666502	84	int sig;
132f7629	85
775585e4	86	ibmvtpm = (struct ibmvtpm_dev *)TPM_VPRIV(chip);
132f7629 AL	87
	88	if (!ibmvtpm->rtce_buf) {
	89	dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n");
	90	return 0;
	91	}
	92
b5666502 AL	93	sig = wait_event_interruptible(ibmvtpm->wq, ibmvtpm->res_len != 0);
	94	if (sig)
	95	return -EINTR;
	96
	97	len = ibmvtpm->res_len;
132f7629	98
b5666502	99	if (count < len) {
132f7629	100	dev_err(ibmvtpm->dev,
37ab0341	101	"Invalid size in recv: count=%zd, crq_size=%d\n",
b5666502	102	count, len);
132f7629 AL	103	return -EIO;
	104	}
	105
	106	spin_lock(&ibmvtpm->rtce_lock);
b5666502 AL	107	memcpy((void )buf, (void )ibmvtpm->rtce_buf, len);
	108	memset(ibmvtpm->rtce_buf, 0, len);
	109	ibmvtpm->res_len = 0;
132f7629 AL	110	spin_unlock(&ibmvtpm->rtce_lock);
	111	return len;
	112	}
	113
	114	/**
	115	* tpm_ibmvtpm_send - Send tpm request
	116	* @chip: tpm chip struct
	117	* @buf: buffer contains data to send
	118	* count: size of buffer
	119	*
	120	* Return value:
	121	* Number of bytes sent
	122	*/
	123	static int tpm_ibmvtpm_send(struct tpm_chip chip, u8 buf, size_t count)
	124	{
	125	struct ibmvtpm_dev *ibmvtpm;
	126	struct ibmvtpm_crq crq;
	127	u64 word = (u64 ) &crq;
	128	int rc;
	129
775585e4	130	ibmvtpm = (struct ibmvtpm_dev *)TPM_VPRIV(chip);
132f7629 AL	131
	132	if (!ibmvtpm->rtce_buf) {
	133	dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n");
	134	return 0;
	135	}
	136
	137	if (count > ibmvtpm->rtce_size) {
	138	dev_err(ibmvtpm->dev,
37ab0341	139	"Invalid size in send: count=%zd, rtce_size=%d\n",
132f7629 AL	140	count, ibmvtpm->rtce_size);
	141	return -EIO;
	142	}
	143
	144	spin_lock(&ibmvtpm->rtce_lock);
	145	memcpy((void )ibmvtpm->rtce_buf, (void )buf, count);
	146	crq.valid = (u8)IBMVTPM_VALID_CMD;
	147	crq.msg = (u8)VTPM_TPM_COMMAND;
	148	crq.len = (u16)count;
	149	crq.data = ibmvtpm->rtce_dma_handle;
	150
	151	rc = ibmvtpm_send_crq(ibmvtpm->vdev, word[0], word[1]);
	152	if (rc != H_SUCCESS) {
	153	dev_err(ibmvtpm->dev, "tpm_ibmvtpm_send failed rc=%d\n", rc);
	154	rc = 0;
	155	} else
	156	rc = count;
	157
	158	spin_unlock(&ibmvtpm->rtce_lock);
	159	return rc;
	160	}
	161
	162	static void tpm_ibmvtpm_cancel(struct tpm_chip *chip)
	163	{
	164	return;
	165	}
	166
	167	static u8 tpm_ibmvtpm_status(struct tpm_chip *chip)
	168	{
	169	return 0;
	170	}
	171
	172	/**
	173	* ibmvtpm_crq_get_rtce_size - Send a CRQ request to get rtce size
	174	* @ibmvtpm: vtpm device struct
	175	*
	176	* Return value:
	177	* 0 - Success
	178	* Non-zero - Failure
	179	*/
	180	static int ibmvtpm_crq_get_rtce_size(struct ibmvtpm_dev *ibmvtpm)
	181	{
	182	struct ibmvtpm_crq crq;
	183	u64 buf = (u64 ) &crq;
	184	int rc;
	185
	186	crq.valid = (u8)IBMVTPM_VALID_CMD;
	187	crq.msg = (u8)VTPM_GET_RTCE_BUFFER_SIZE;
	188
	189	rc = ibmvtpm_send_crq(ibmvtpm->vdev, buf[0], buf[1]);
	190	if (rc != H_SUCCESS)
	191	dev_err(ibmvtpm->dev,
	192	"ibmvtpm_crq_get_rtce_size failed rc=%d\n", rc);
	193
	194	return rc;
	195	}
	196
	197	/**
	198	* ibmvtpm_crq_get_version - Send a CRQ request to get vtpm version
	199	* - Note that this is vtpm version and not tpm version
	200	* @ibmvtpm: vtpm device struct
	201	*
	202	* Return value:
	203	* 0 - Success
204	* Non-zero - Failure
205	*/
206	static int ibmvtpm_crq_get_version(struct ibmvtpm_dev *ibmvtpm)
207	{
208	struct ibmvtpm_crq crq;
209	u64 buf = (u64 ) &crq;
210	int rc;
211
212	crq.valid = (u8)IBMVTPM_VALID_CMD;
213	crq.msg = (u8)VTPM_GET_VERSION;
214
215	rc = ibmvtpm_send_crq(ibmvtpm->vdev, buf[0], buf[1]);
216	if (rc != H_SUCCESS)
217	dev_err(ibmvtpm->dev,
218	"ibmvtpm_crq_get_version failed rc=%d\n", rc);
219
220	return rc;
221	}
222
223	/**
224	* ibmvtpm_crq_send_init_complete - Send a CRQ initialize complete message
225	* @ibmvtpm: vtpm device struct
226	*
227	* Return value:
228	* 0 - Success
229	* Non-zero - Failure
230	*/
231	static int ibmvtpm_crq_send_init_complete(struct ibmvtpm_dev *ibmvtpm)
232	{
233	int rc;
234
235	rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_COMP_CMD, 0);
236	if (rc != H_SUCCESS)
237	dev_err(ibmvtpm->dev,
238	"ibmvtpm_crq_send_init_complete failed rc=%d\n", rc);
239
240	return rc;
241	}
242
243	/**
244	* ibmvtpm_crq_send_init - Send a CRQ initialize message
245	* @ibmvtpm: vtpm device struct
246	*
247	* Return value:
248	* 0 - Success
249	* Non-zero - Failure
250	*/
251	static int ibmvtpm_crq_send_init(struct ibmvtpm_dev *ibmvtpm)
252	{
253	int rc;
254
255	rc = ibmvtpm_send_crq(ibmvtpm->vdev, INIT_CRQ_CMD, 0);
256	if (rc != H_SUCCESS)
257	dev_err(ibmvtpm->dev,
258	"ibmvtpm_crq_send_init failed rc=%d\n", rc);
259
260	return rc;
261	}
262
263	/**
264	* tpm_ibmvtpm_remove - ibm vtpm remove entry point
265	* @vdev: vio device struct
266	*
267	* Return value:
268	* 0
269	*/
39af33fc	270	static int tpm_ibmvtpm_remove(struct vio_dev *vdev)
132f7629 AL	271	{
132f7629 AL	272	struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
afb5abc2	273	struct tpm_chip *chip = dev_get_drvdata(ibmvtpm->dev);
132f7629 AL	274	int rc = 0;
132f7629 AL	275
afb5abc2 JS	276	tpm_chip_unregister(chip);
afb5abc2 JS	277
132f7629	278	free_irq(vdev->irq, ibmvtpm);
132f7629 AL	279
	280	do {
	281	if (rc)
	282	msleep(100);
	283	rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
	284	} while (rc == H_BUSY \|\| H_IS_LONG_BUSY(rc));
	285
	286	dma_unmap_single(ibmvtpm->dev, ibmvtpm->crq_dma_handle,
	287	CRQ_RES_BUF_SIZE, DMA_BIDIRECTIONAL);
	288	free_page((unsigned long)ibmvtpm->crq_queue.crq_addr);
	289
	290	if (ibmvtpm->rtce_buf) {
	291	dma_unmap_single(ibmvtpm->dev, ibmvtpm->rtce_dma_handle,
	292	ibmvtpm->rtce_size, DMA_BIDIRECTIONAL);
	293	kfree(ibmvtpm->rtce_buf);
	294	}
	295
132f7629 AL	296	kfree(ibmvtpm);
	297
	298	return 0;
	299	}
	300
	301	/**
	302	* tpm_ibmvtpm_get_desired_dma - Get DMA size needed by this driver
	303	* @vdev: vio device struct
	304	*
	305	* Return value:
	306	* Number of bytes the driver needs to DMA map
	307	*/
	308	static unsigned long tpm_ibmvtpm_get_desired_dma(struct vio_dev *vdev)
	309	{
	310	struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
84eb186b HCVL	311
	312	/* ibmvtpm initializes at probe time, so the data we are
	313	* asking for may not be set yet. Estimate that 4K required
	314	* for TCE-mapped buffer in addition to CRQ.
	315	*/
	316	if (!ibmvtpm)
	317	return CRQ_RES_BUF_SIZE + PAGE_SIZE;
	318
132f7629 AL	319	return CRQ_RES_BUF_SIZE + ibmvtpm->rtce_size;
	320	}
	321
	322	/**
	323	* tpm_ibmvtpm_suspend - Suspend
	324	* @dev: device struct
	325	*
	326	* Return value:
	327	* 0
	328	*/
	329	static int tpm_ibmvtpm_suspend(struct device *dev)
	330	{
	331	struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
	332	struct ibmvtpm_crq crq;
	333	u64 buf = (u64 ) &crq;
	334	int rc = 0;
	335
	336	crq.valid = (u8)IBMVTPM_VALID_CMD;
	337	crq.msg = (u8)VTPM_PREPARE_TO_SUSPEND;
	338
	339	rc = ibmvtpm_send_crq(ibmvtpm->vdev, buf[0], buf[1]);
	340	if (rc != H_SUCCESS)
	341	dev_err(ibmvtpm->dev,
	342	"tpm_ibmvtpm_suspend failed rc=%d\n", rc);
	343
	344	return rc;
	345	}
	346
	347	/**
	348	* ibmvtpm_reset_crq - Reset CRQ
	349	* @ibmvtpm: ibm vtpm struct
	350	*
	351	* Return value:
	352	* 0 - Success
	353	* Non-zero - Failure
	354	*/
	355	static int ibmvtpm_reset_crq(struct ibmvtpm_dev *ibmvtpm)
	356	{
	357	int rc = 0;
	358
	359	do {
	360	if (rc)
	361	msleep(100);
	362	rc = plpar_hcall_norets(H_FREE_CRQ,
	363	ibmvtpm->vdev->unit_address);
	364	} while (rc == H_BUSY \|\| H_IS_LONG_BUSY(rc));
	365
	366	memset(ibmvtpm->crq_queue.crq_addr, 0, CRQ_RES_BUF_SIZE);
	367	ibmvtpm->crq_queue.index = 0;
	368
	369	return plpar_hcall_norets(H_REG_CRQ, ibmvtpm->vdev->unit_address,
	370	ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
	371	}
	372
	373	/**
	374	* tpm_ibmvtpm_resume - Resume from suspend
	375	* @dev: device struct
	376	*
	377	* Return value:
	378	* 0
	379	*/
	380	static int tpm_ibmvtpm_resume(struct device *dev)
	381	{
	382	struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(dev);
132f7629 AL	383	int rc = 0;
	384
	385	do {
	386	if (rc)
	387	msleep(100);
	388	rc = plpar_hcall_norets(H_ENABLE_CRQ,
	389	ibmvtpm->vdev->unit_address);
	390	} while (rc == H_IN_PROGRESS \|\| rc == H_BUSY \|\| H_IS_LONG_BUSY(rc));
	391
	392	if (rc) {
	393	dev_err(dev, "Error enabling ibmvtpm rc=%d\n", rc);
	394	return rc;
	395	}
	396
b5666502 AL	397	rc = vio_enable_interrupts(ibmvtpm->vdev);
	398	if (rc) {
	399	dev_err(dev, "Error vio_enable_interrupts rc=%d\n", rc);
	400	return rc;
	401	}
132f7629 AL	402
	403	rc = ibmvtpm_crq_send_init(ibmvtpm);
	404	if (rc)
	405	dev_err(dev, "Error send_init rc=%d\n", rc);
	406
	407	return rc;
	408	}
	409
1f866057 SB	410	static bool tpm_ibmvtpm_req_canceled(struct tpm_chip *chip, u8 status)
	411	{
	412	return (status == 0);
	413	}
	414
01ad1fa7	415	static const struct tpm_class_ops tpm_ibmvtpm = {
132f7629 AL	416	.recv = tpm_ibmvtpm_recv,
	417	.send = tpm_ibmvtpm_send,
	418	.cancel = tpm_ibmvtpm_cancel,
	419	.status = tpm_ibmvtpm_status,
	420	.req_complete_mask = 0,
	421	.req_complete_val = 0,
1f866057	422	.req_canceled = tpm_ibmvtpm_req_canceled,
132f7629 AL	423	};
	424
	425	static const struct dev_pm_ops tpm_ibmvtpm_pm_ops = {
	426	.suspend = tpm_ibmvtpm_suspend,
	427	.resume = tpm_ibmvtpm_resume,
	428	};
	429
	430	/**
	431	* ibmvtpm_crq_get_next - Get next responded crq
	432	* @ibmvtpm vtpm device struct
	433	*
	434	* Return value:
	435	* vtpm crq pointer
	436	*/
	437	static struct ibmvtpm_crq ibmvtpm_crq_get_next(struct ibmvtpm_dev ibmvtpm)
	438	{
	439	struct ibmvtpm_crq_queue *crq_q = &ibmvtpm->crq_queue;
	440	struct ibmvtpm_crq *crq = &crq_q->crq_addr[crq_q->index];
	441
	442	if (crq->valid & VTPM_MSG_RES) {
	443	if (++crq_q->index == crq_q->num_entry)
	444	crq_q->index = 0;
b5666502	445	smp_rmb();
132f7629 AL	446	} else
	447	crq = NULL;
	448	return crq;
	449	}
	450
	451	/**
	452	* ibmvtpm_crq_process - Process responded crq
	453	* @crq crq to be processed
	454	* @ibmvtpm vtpm device struct
	455	*
	456	* Return value:
	457	* Nothing
	458	*/
	459	static void ibmvtpm_crq_process(struct ibmvtpm_crq *crq,
	460	struct ibmvtpm_dev *ibmvtpm)
	461	{
	462	int rc = 0;
	463
	464	switch (crq->valid) {
	465	case VALID_INIT_CRQ:
	466	switch (crq->msg) {
	467	case INIT_CRQ_RES:
	468	dev_info(ibmvtpm->dev, "CRQ initialized\n");
	469	rc = ibmvtpm_crq_send_init_complete(ibmvtpm);
	470	if (rc)
	471	dev_err(ibmvtpm->dev, "Unable to send CRQ init complete rc=%d\n", rc);
	472	return;
	473	case INIT_CRQ_COMP_RES:
	474	dev_info(ibmvtpm->dev,
	475	"CRQ initialization completed\n");
	476	return;
	477	default:
	478	dev_err(ibmvtpm->dev, "Unknown crq message type: %d\n", crq->msg);
	479	return;
	480	}
132f7629 AL	481	case IBMVTPM_VALID_CMD:
	482	switch (crq->msg) {
	483	case VTPM_GET_RTCE_BUFFER_SIZE_RES:
	484	if (crq->len <= 0) {
	485	dev_err(ibmvtpm->dev, "Invalid rtce size\n");
	486	return;
	487	}
	488	ibmvtpm->rtce_size = crq->len;
	489	ibmvtpm->rtce_buf = kmalloc(ibmvtpm->rtce_size,
	490	GFP_KERNEL);
	491	if (!ibmvtpm->rtce_buf) {
	492	dev_err(ibmvtpm->dev, "Failed to allocate memory for rtce buffer\n");
	493	return;
	494	}
	495
	496	ibmvtpm->rtce_dma_handle = dma_map_single(ibmvtpm->dev,
	497	ibmvtpm->rtce_buf, ibmvtpm->rtce_size,
	498	DMA_BIDIRECTIONAL);
	499
	500	if (dma_mapping_error(ibmvtpm->dev,
	501	ibmvtpm->rtce_dma_handle)) {
	502	kfree(ibmvtpm->rtce_buf);
	503	ibmvtpm->rtce_buf = NULL;
	504	dev_err(ibmvtpm->dev, "Failed to dma map rtce buffer\n");
	505	}
	506
	507	return;
	508	case VTPM_GET_VERSION_RES:
	509	ibmvtpm->vtpm_version = crq->data;
	510	return;
	511	case VTPM_TPM_COMMAND_RES:
b5666502 AL	512	/* len of the data in rtce buffer */
	513	ibmvtpm->res_len = crq->len;
	514	wake_up_interruptible(&ibmvtpm->wq);
132f7629 AL	515	return;
	516	default:
	517	return;
	518	}
	519	}
	520	return;
	521	}
	522
	523	/**
	524	* ibmvtpm_interrupt - Interrupt handler
	525	* @irq: irq number to handle
	526	* @vtpm_instance: vtpm that received interrupt
	527	*
	528	* Returns:
	529	* IRQ_HANDLED
	530	**/
	531	static irqreturn_t ibmvtpm_interrupt(int irq, void *vtpm_instance)
	532	{
	533	struct ibmvtpm_dev ibmvtpm = (struct ibmvtpm_dev ) vtpm_instance;
132f7629	534	struct ibmvtpm_crq *crq;
132f7629	535
b5666502 AL	536	/* while loop is needed for initial setup (get version and
	537	* get rtce_size). There should be only one tpm request at any
	538	* given time.
	539	*/
132f7629 AL	540	while ((crq = ibmvtpm_crq_get_next(ibmvtpm)) != NULL) {
	541	ibmvtpm_crq_process(crq, ibmvtpm);
	542	crq->valid = 0;
b5666502	543	smp_wmb();
132f7629 AL	544	}
132f7629 AL	545
b5666502	546	return IRQ_HANDLED;
132f7629 AL	547	}
	548
	549	/**
	550	* tpm_ibmvtpm_probe - ibm vtpm initialize entry point
	551	* @vio_dev: vio device struct
	552	* @id: vio device id struct
	553	*
	554	* Return value:
	555	* 0 - Success
	556	* Non-zero - Failure
	557	*/
afc6d369	558	static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
132f7629 AL	559	const struct vio_device_id *id)
	560	{
	561	struct ibmvtpm_dev *ibmvtpm;
	562	struct device *dev = &vio_dev->dev;
	563	struct ibmvtpm_crq_queue *crq_q;
	564	struct tpm_chip *chip;
	565	int rc = -ENOMEM, rc1;
	566
afb5abc2 JS	567	chip = tpmm_chip_alloc(dev, &tpm_ibmvtpm);
	568	if (IS_ERR(chip))
	569	return PTR_ERR(chip);
132f7629 AL	570
	571	ibmvtpm = kzalloc(sizeof(struct ibmvtpm_dev), GFP_KERNEL);
	572	if (!ibmvtpm) {
	573	dev_err(dev, "kzalloc for ibmvtpm failed\n");
	574	goto cleanup;
	575	}
	576
	577	crq_q = &ibmvtpm->crq_queue;
	578	crq_q->crq_addr = (struct ibmvtpm_crq *)get_zeroed_page(GFP_KERNEL);
	579	if (!crq_q->crq_addr) {
	580	dev_err(dev, "Unable to allocate memory for crq_addr\n");
	581	goto cleanup;
	582	}
	583
	584	crq_q->num_entry = CRQ_RES_BUF_SIZE / sizeof(*crq_q->crq_addr);
	585	ibmvtpm->crq_dma_handle = dma_map_single(dev, crq_q->crq_addr,
	586	CRQ_RES_BUF_SIZE,
	587	DMA_BIDIRECTIONAL);
	588
	589	if (dma_mapping_error(dev, ibmvtpm->crq_dma_handle)) {
	590	dev_err(dev, "dma mapping failed\n");
	591	goto cleanup;
	592	}
	593
	594	rc = plpar_hcall_norets(H_REG_CRQ, vio_dev->unit_address,
	595	ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE);
	596	if (rc == H_RESOURCE)
	597	rc = ibmvtpm_reset_crq(ibmvtpm);
	598
	599	if (rc) {
	600	dev_err(dev, "Unable to register CRQ rc=%d\n", rc);
	601	goto reg_crq_cleanup;
	602	}
	603
132f7629 AL	604	rc = request_irq(vio_dev->irq, ibmvtpm_interrupt, 0,
	605	tpm_ibmvtpm_driver_name, ibmvtpm);
	606	if (rc) {
	607	dev_err(dev, "Error %d register irq 0x%x\n", rc, vio_dev->irq);
	608	goto init_irq_cleanup;
	609	}
	610
	611	rc = vio_enable_interrupts(vio_dev);
	612	if (rc) {
	613	dev_err(dev, "Error %d enabling interrupts\n", rc);
	614	goto init_irq_cleanup;
	615	}
	616
b5666502 AL	617	init_waitqueue_head(&ibmvtpm->wq);
b5666502 AL	618
132f7629 AL	619	crq_q->index = 0;
	620
	621	ibmvtpm->dev = dev;
	622	ibmvtpm->vdev = vio_dev;
775585e4	623	TPM_VPRIV(chip) = (void *)ibmvtpm;
132f7629	624
132f7629 AL	625	spin_lock_init(&ibmvtpm->rtce_lock);
	626
	627	rc = ibmvtpm_crq_send_init(ibmvtpm);
	628	if (rc)
	629	goto init_irq_cleanup;
	630
	631	rc = ibmvtpm_crq_get_version(ibmvtpm);
	632	if (rc)
	633	goto init_irq_cleanup;
	634
	635	rc = ibmvtpm_crq_get_rtce_size(ibmvtpm);
	636	if (rc)
	637	goto init_irq_cleanup;
	638
afb5abc2	639	return tpm_chip_register(chip);
132f7629	640	init_irq_cleanup:
132f7629 AL	641	do {
	642	rc1 = plpar_hcall_norets(H_FREE_CRQ, vio_dev->unit_address);
	643	} while (rc1 == H_BUSY \|\| H_IS_LONG_BUSY(rc1));
	644	reg_crq_cleanup:
	645	dma_unmap_single(dev, ibmvtpm->crq_dma_handle, CRQ_RES_BUF_SIZE,
	646	DMA_BIDIRECTIONAL);
	647	cleanup:
	648	if (ibmvtpm) {
	649	if (crq_q->crq_addr)
	650	free_page((unsigned long)crq_q->crq_addr);
	651	kfree(ibmvtpm);
	652	}
	653
132f7629 AL	654	return rc;
	655	}
	656
	657	static struct vio_driver ibmvtpm_driver = {
	658	.id_table = tpm_ibmvtpm_device_table,
	659	.probe = tpm_ibmvtpm_probe,
	660	.remove = tpm_ibmvtpm_remove,
	661	.get_desired_dma = tpm_ibmvtpm_get_desired_dma,
	662	.name = tpm_ibmvtpm_driver_name,
	663	.pm = &tpm_ibmvtpm_pm_ops,
	664	};
	665
	666	/**
	667	* ibmvtpm_module_init - Initialize ibm vtpm module
	668	*
	669	* Return value:
	670	* 0 -Success
	671	* Non-zero - Failure
	672	*/
	673	static int __init ibmvtpm_module_init(void)
	674	{
	675	return vio_register_driver(&ibmvtpm_driver);
	676	}
	677
	678	/**
	679	* ibmvtpm_module_exit - Teardown ibm vtpm module
	680	*
	681	* Return value:
	682	* Nothing
	683	*/
	684	static void __exit ibmvtpm_module_exit(void)
	685	{
	686	vio_unregister_driver(&ibmvtpm_driver);
	687	}
	688
	689	module_init(ibmvtpm_module_init);
	690	module_exit(ibmvtpm_module_exit);
	691
	692	MODULE_AUTHOR("adlai@us.ibm.com");
	693	MODULE_DESCRIPTION("IBM vTPM Driver");
	694	MODULE_VERSION("1.0");
	695	MODULE_LICENSE("GPL");