| /* |
| * 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[] = { |
| { "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); |
| int rc = 0; |
| |
| 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); |
| } |
| |
| 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); |
| 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 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 = tpm_ibmvtpm_req_canceled, |
| .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; |
| 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; |
| } |
| 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 = 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; |
| } |
| |
| 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 rc; |
| 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); |
| } |
| |
| 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"); |