drivers/char/tpm: Add new device driver to support IBM vTPM

This patch adds a new device driver to support IBM virtual TPM
(vTPM) for PPC64.  IBM vTPM is supported through the adjunct
partition with firmware release 740 or higher.  With vTPM
support, each lpar is able to have its own vTPM without the
physical TPM hardware.

This driver provides TPM functionalities by communicating with
the vTPM adjunct partition through Hypervisor calls (Hcalls)
and Command/Response Queue (CRQ) commands.

Signed-off-by: Ashley Lai <adlai@us.ibm.com>
Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>

1 files changed, 749 insertions, 0 deletions

diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c
new file mode 100644
index 000000000000..efc4ab36a9d6
--- /dev/null
+++ b/drivers/char/tpm/tpm_ibmvtpm.c
@@ -0,0 +1,749 @@
+/*
+ * Copyright (C) 2012 IBM Corporation
+ *
+ * Author: Ashley Lai <adlai@us.ibm.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[] __devinitdata = {
+        { "IBM,vtpm", "IBM,vtpm"},
+        { "", "" }
+};
+MODULE_DEVICE_TABLE(vio, tpm_ibmvtpm_device_table);
+
+DECLARE_WAIT_QUEUE_HEAD(wq);
+
+/**
+ * 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 *)chip->vendor.data;
+        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;
+
+        ibmvtpm = (struct ibmvtpm_dev *)chip->vendor.data;
+
+        if (!ibmvtpm->rtce_buf) {
+                dev_err(ibmvtpm->dev, "ibmvtpm device is not ready\n");
+                return 0;
+        }
+
+        wait_event_interruptible(wq, ibmvtpm->crq_res.len != 0);
+
+        if (count < ibmvtpm->crq_res.len) {
+                dev_err(ibmvtpm->dev,
+                        "Invalid size in recv: count=%ld, crq_size=%d\n",
+                        count, ibmvtpm->crq_res.len);
+                return -EIO;
+        }
+
+        spin_lock(&ibmvtpm->rtce_lock);
+        memcpy((void *)buf, (void *)ibmvtpm->rtce_buf, ibmvtpm->crq_res.len);
+        memset(ibmvtpm->rtce_buf, 0, ibmvtpm->crq_res.len);
+        ibmvtpm->crq_res.valid = 0;
+        ibmvtpm->crq_res.msg = 0;
+        len = ibmvtpm->crq_res.len;
+        ibmvtpm->crq_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 *)chip->vendor.data;
+
+        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=%ld, 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 __devexit tpm_ibmvtpm_remove(struct vio_dev *vdev)
+{
+        struct ibmvtpm_dev *ibmvtpm = ibmvtpm_get_data(&vdev->dev);
+        int rc = 0;
+
+        free_irq(vdev->irq, ibmvtpm);
+        tasklet_kill(&ibmvtpm->tasklet);
+
+        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);
+        }
+
+        tpm_remove_hardware(ibmvtpm->dev);
+
+        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);
+        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);
+        unsigned long flags;
+        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;
+        }
+
+        spin_lock_irqsave(&ibmvtpm->lock, flags);
+        vio_disable_interrupts(ibmvtpm->vdev);
+        tasklet_schedule(&ibmvtpm->tasklet);
+        spin_unlock_irqrestore(&ibmvtpm->lock, flags);
+
+        rc = ibmvtpm_crq_send_init(ibmvtpm);
+        if (rc)
+                dev_err(dev, "Error send_init rc=%d\n", rc);
+
+        return rc;
+}
+
+static const struct file_operations ibmvtpm_ops = {
+        .owner = THIS_MODULE,
+        .llseek = no_llseek,
+        .open = tpm_open,
+        .read = tpm_read,
+        .write = tpm_write,
+        .release = tpm_release,
+};
+
+static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
+static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
+static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
+static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
+static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
+static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated,
+                   NULL);
+static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
+static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
+static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL);
+static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL);
+
+static struct attribute *ibmvtpm_attrs[] = {
+        &dev_attr_pubek.attr,
+        &dev_attr_pcrs.attr,
+        &dev_attr_enabled.attr,
+        &dev_attr_active.attr,
+        &dev_attr_owned.attr,
+        &dev_attr_temp_deactivated.attr,
+        &dev_attr_caps.attr,
+        &dev_attr_cancel.attr,
+        &dev_attr_durations.attr,
+        &dev_attr_timeouts.attr, NULL,
+};
+
+static struct attribute_group ibmvtpm_attr_grp = { .attrs = ibmvtpm_attrs };
+
+static const struct tpm_vendor_specific 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 = 0,
+        .attr_group = &ibmvtpm_attr_grp,
+        .miscdev = { .fops = &ibmvtpm_ops, },
+};
+
+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;
+                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;
+                }
+                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:
+                        ibmvtpm->crq_res.valid = crq->valid;
+                        ibmvtpm->crq_res.msg = crq->msg;
+                        ibmvtpm->crq_res.len = crq->len;
+                        ibmvtpm->crq_res.data = crq->data;
+                        wake_up_interruptible(&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;
+        unsigned long flags;
+
+        spin_lock_irqsave(&ibmvtpm->lock, flags);
+        vio_disable_interrupts(ibmvtpm->vdev);
+        tasklet_schedule(&ibmvtpm->tasklet);
+        spin_unlock_irqrestore(&ibmvtpm->lock, flags);
+
+        return IRQ_HANDLED;
+}
+
+/**
+ * ibmvtpm_tasklet - Interrupt handler tasklet
+ * @data:       ibm vtpm device struct
+ *
+ * Returns:
+ *      Nothing
+ **/
+static void ibmvtpm_tasklet(void *data)
+{
+        struct ibmvtpm_dev *ibmvtpm = data;
+        struct ibmvtpm_crq *crq;
+        unsigned long flags;
+
+        spin_lock_irqsave(&ibmvtpm->lock, flags);
+        while ((crq = ibmvtpm_crq_get_next(ibmvtpm)) != NULL) {
+                ibmvtpm_crq_process(crq, ibmvtpm);
+                crq->valid = 0;
+                wmb();
+        }
+
+        vio_enable_interrupts(ibmvtpm->vdev);
+        spin_unlock_irqrestore(&ibmvtpm->lock, flags);
+}
+
+/**
+ * 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 __devinit 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 = tpm_register_hardware(dev, &tpm_ibmvtpm);
+        if (!chip) {
+                dev_err(dev, "tpm_register_hardware failed\n");
+                return -ENODEV;
+        }
+
+        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;
+        }
+
+        tasklet_init(&ibmvtpm->tasklet, (void *)ibmvtpm_tasklet,
+                     (unsigned long)ibmvtpm);
+
+        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;
+        }
+
+        crq_q->index = 0;
+
+        ibmvtpm->dev = dev;
+        ibmvtpm->vdev = vio_dev;
+        chip->vendor.data = (void *)ibmvtpm;
+
+        spin_lock_init(&ibmvtpm->lock);
+        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 rc;
+init_irq_cleanup:
+        tasklet_kill(&ibmvtpm->tasklet);
+        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);
+        }
+
+        tpm_remove_hardware(dev);
+
+        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");