X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fchar%2Ftpm%2Ftpm_ibmvtpm.c;fp=kernel%2Fdrivers%2Fchar%2Ftpm%2Ftpm_ibmvtpm.c;h=42ffa5e7a1e0f6c912a0e214e67a3a99d1511a08;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git

diff --git a/kernel/drivers/char/tpm/tpm_ibmvtpm.c b/kernel/drivers/char/tpm/tpm_ibmvtpm.c
new file mode 100644
index 000000000..42ffa5e7a
--- /dev/null
+++ b/kernel/drivers/char/tpm/tpm_ibmvtpm.c
@@ -0,0 +1,699 @@
+/*
+ * 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;
+	__be64 *word = (__be64 *)&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 = cpu_to_be16(count);
+	crq.data = cpu_to_be32(ibmvtpm->rtce_dma_handle);
+
+	rc = ibmvtpm_send_crq(ibmvtpm->vdev, be64_to_cpu(word[0]),
+			      be64_to_cpu(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, cpu_to_be64(buf[0]),
+			      cpu_to_be64(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, cpu_to_be64(buf[0]),
+			      cpu_to_be64(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, cpu_to_be64(buf[0]),
+			      cpu_to_be64(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 (be16_to_cpu(crq->len) <= 0) {
+				dev_err(ibmvtpm->dev, "Invalid rtce size\n");
+				return;
+			}
+			ibmvtpm->rtce_size = be16_to_cpu(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 = be32_to_cpu(crq->data);
+			return;
+		case VTPM_TPM_COMMAND_RES:
+			/* len of the data in rtce buffer */
+			ibmvtpm->res_len = be16_to_cpu(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");