![Jason Gunthorpe](/assets/img/avatar_default.png)
The version of the TPM should not depend on the bus it is connected through. 1.1, 1.2 and soon 2.0 TPMS will be all be able to use the same bus interfaces. Make tpm_show_caps try the 1.2 capability first. If that fails then fall back to the 1.1 capability. This effectively auto-detects what interface the TPM supports at run-time. Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Reviewed-by: Joel Schopp <jschopp@linux.vnet.ibm.com> Reviewed-by: Peter Huewe <peterhuewe@gmx.de> Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
928 lines
23 KiB
C
928 lines
23 KiB
C
/*
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* Copyright (C) 2005, 2006 IBM Corporation
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*
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* Authors:
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* Leendert van Doorn <leendert@watson.ibm.com>
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* Kylene Hall <kjhall@us.ibm.com>
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*
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* Maintained by: <tpmdd-devel@lists.sourceforge.net>
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*
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* Device driver for TCG/TCPA TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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*
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* This device driver implements the TPM interface as defined in
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* the TCG TPM Interface Spec version 1.2, revision 1.0.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/pnp.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/wait.h>
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#include <linux/acpi.h>
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#include <linux/freezer.h>
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#include "tpm.h"
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enum tis_access {
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TPM_ACCESS_VALID = 0x80,
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TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
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TPM_ACCESS_REQUEST_PENDING = 0x04,
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TPM_ACCESS_REQUEST_USE = 0x02,
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};
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enum tis_status {
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TPM_STS_VALID = 0x80,
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TPM_STS_COMMAND_READY = 0x40,
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TPM_STS_GO = 0x20,
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TPM_STS_DATA_AVAIL = 0x10,
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TPM_STS_DATA_EXPECT = 0x08,
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};
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enum tis_int_flags {
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TPM_GLOBAL_INT_ENABLE = 0x80000000,
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TPM_INTF_BURST_COUNT_STATIC = 0x100,
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TPM_INTF_CMD_READY_INT = 0x080,
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TPM_INTF_INT_EDGE_FALLING = 0x040,
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TPM_INTF_INT_EDGE_RISING = 0x020,
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TPM_INTF_INT_LEVEL_LOW = 0x010,
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TPM_INTF_INT_LEVEL_HIGH = 0x008,
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TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
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TPM_INTF_STS_VALID_INT = 0x002,
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TPM_INTF_DATA_AVAIL_INT = 0x001,
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};
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enum tis_defaults {
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TIS_MEM_BASE = 0xFED40000,
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TIS_MEM_LEN = 0x5000,
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TIS_SHORT_TIMEOUT = 750, /* ms */
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TIS_LONG_TIMEOUT = 2000, /* 2 sec */
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};
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#define TPM_ACCESS(l) (0x0000 | ((l) << 12))
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#define TPM_INT_ENABLE(l) (0x0008 | ((l) << 12))
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#define TPM_INT_VECTOR(l) (0x000C | ((l) << 12))
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#define TPM_INT_STATUS(l) (0x0010 | ((l) << 12))
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#define TPM_INTF_CAPS(l) (0x0014 | ((l) << 12))
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#define TPM_STS(l) (0x0018 | ((l) << 12))
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#define TPM_DATA_FIFO(l) (0x0024 | ((l) << 12))
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#define TPM_DID_VID(l) (0x0F00 | ((l) << 12))
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#define TPM_RID(l) (0x0F04 | ((l) << 12))
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static LIST_HEAD(tis_chips);
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static DEFINE_MUTEX(tis_lock);
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#if defined(CONFIG_PNP) && defined(CONFIG_ACPI)
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static int is_itpm(struct pnp_dev *dev)
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{
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struct acpi_device *acpi = pnp_acpi_device(dev);
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struct acpi_hardware_id *id;
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if (!acpi)
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return 0;
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list_for_each_entry(id, &acpi->pnp.ids, list) {
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if (!strcmp("INTC0102", id->id))
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return 1;
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}
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return 0;
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}
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#else
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static inline int is_itpm(struct pnp_dev *dev)
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{
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return 0;
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}
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#endif
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/* Before we attempt to access the TPM we must see that the valid bit is set.
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* The specification says that this bit is 0 at reset and remains 0 until the
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* 'TPM has gone through its self test and initialization and has established
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* correct values in the other bits.' */
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static int wait_startup(struct tpm_chip *chip, int l)
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{
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unsigned long stop = jiffies + chip->vendor.timeout_a;
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do {
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if (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
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TPM_ACCESS_VALID)
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return 0;
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msleep(TPM_TIMEOUT);
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} while (time_before(jiffies, stop));
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return -1;
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}
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static int check_locality(struct tpm_chip *chip, int l)
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{
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if ((ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
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(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
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(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
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return chip->vendor.locality = l;
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return -1;
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}
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static void release_locality(struct tpm_chip *chip, int l, int force)
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{
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if (force || (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
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(TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
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(TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID))
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iowrite8(TPM_ACCESS_ACTIVE_LOCALITY,
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chip->vendor.iobase + TPM_ACCESS(l));
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}
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static int request_locality(struct tpm_chip *chip, int l)
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{
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unsigned long stop, timeout;
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long rc;
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if (check_locality(chip, l) >= 0)
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return l;
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iowrite8(TPM_ACCESS_REQUEST_USE,
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chip->vendor.iobase + TPM_ACCESS(l));
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stop = jiffies + chip->vendor.timeout_a;
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if (chip->vendor.irq) {
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again:
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timeout = stop - jiffies;
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if ((long)timeout <= 0)
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return -1;
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rc = wait_event_interruptible_timeout(chip->vendor.int_queue,
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(check_locality
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(chip, l) >= 0),
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timeout);
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if (rc > 0)
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return l;
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if (rc == -ERESTARTSYS && freezing(current)) {
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clear_thread_flag(TIF_SIGPENDING);
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goto again;
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}
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} else {
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/* wait for burstcount */
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do {
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if (check_locality(chip, l) >= 0)
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return l;
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msleep(TPM_TIMEOUT);
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}
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while (time_before(jiffies, stop));
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}
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return -1;
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}
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static u8 tpm_tis_status(struct tpm_chip *chip)
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{
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return ioread8(chip->vendor.iobase +
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TPM_STS(chip->vendor.locality));
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}
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static void tpm_tis_ready(struct tpm_chip *chip)
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{
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/* this causes the current command to be aborted */
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iowrite8(TPM_STS_COMMAND_READY,
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chip->vendor.iobase + TPM_STS(chip->vendor.locality));
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}
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static int get_burstcount(struct tpm_chip *chip)
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{
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unsigned long stop;
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int burstcnt;
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/* wait for burstcount */
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/* which timeout value, spec has 2 answers (c & d) */
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stop = jiffies + chip->vendor.timeout_d;
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do {
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burstcnt = ioread8(chip->vendor.iobase +
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TPM_STS(chip->vendor.locality) + 1);
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burstcnt += ioread8(chip->vendor.iobase +
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TPM_STS(chip->vendor.locality) +
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2) << 8;
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if (burstcnt)
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return burstcnt;
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msleep(TPM_TIMEOUT);
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} while (time_before(jiffies, stop));
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return -EBUSY;
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}
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static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
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{
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int size = 0, burstcnt;
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while (size < count &&
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wait_for_tpm_stat(chip,
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TPM_STS_DATA_AVAIL | TPM_STS_VALID,
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chip->vendor.timeout_c,
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&chip->vendor.read_queue, true)
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== 0) {
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burstcnt = get_burstcount(chip);
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for (; burstcnt > 0 && size < count; burstcnt--)
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buf[size++] = ioread8(chip->vendor.iobase +
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TPM_DATA_FIFO(chip->vendor.
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locality));
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}
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return size;
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}
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static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
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{
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int size = 0;
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int expected, status;
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if (count < TPM_HEADER_SIZE) {
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size = -EIO;
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goto out;
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}
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/* read first 10 bytes, including tag, paramsize, and result */
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if ((size =
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recv_data(chip, buf, TPM_HEADER_SIZE)) < TPM_HEADER_SIZE) {
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dev_err(chip->dev, "Unable to read header\n");
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goto out;
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}
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expected = be32_to_cpu(*(__be32 *) (buf + 2));
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if (expected > count) {
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size = -EIO;
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goto out;
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}
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if ((size +=
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recv_data(chip, &buf[TPM_HEADER_SIZE],
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expected - TPM_HEADER_SIZE)) < expected) {
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dev_err(chip->dev, "Unable to read remainder of result\n");
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size = -ETIME;
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goto out;
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}
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wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
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&chip->vendor.int_queue, false);
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status = tpm_tis_status(chip);
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if (status & TPM_STS_DATA_AVAIL) { /* retry? */
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dev_err(chip->dev, "Error left over data\n");
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size = -EIO;
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goto out;
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}
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out:
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tpm_tis_ready(chip);
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release_locality(chip, chip->vendor.locality, 0);
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return size;
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}
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static bool itpm;
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module_param(itpm, bool, 0444);
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MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");
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/*
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* If interrupts are used (signaled by an irq set in the vendor structure)
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* tpm.c can skip polling for the data to be available as the interrupt is
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* waited for here
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*/
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static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
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{
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int rc, status, burstcnt;
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size_t count = 0;
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if (request_locality(chip, 0) < 0)
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return -EBUSY;
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status = tpm_tis_status(chip);
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if ((status & TPM_STS_COMMAND_READY) == 0) {
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tpm_tis_ready(chip);
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if (wait_for_tpm_stat
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(chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
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&chip->vendor.int_queue, false) < 0) {
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rc = -ETIME;
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goto out_err;
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}
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}
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while (count < len - 1) {
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burstcnt = get_burstcount(chip);
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for (; burstcnt > 0 && count < len - 1; burstcnt--) {
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iowrite8(buf[count], chip->vendor.iobase +
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TPM_DATA_FIFO(chip->vendor.locality));
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count++;
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}
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wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
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&chip->vendor.int_queue, false);
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status = tpm_tis_status(chip);
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if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
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rc = -EIO;
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goto out_err;
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}
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}
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/* write last byte */
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iowrite8(buf[count],
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chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality));
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wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
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&chip->vendor.int_queue, false);
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status = tpm_tis_status(chip);
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if ((status & TPM_STS_DATA_EXPECT) != 0) {
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rc = -EIO;
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goto out_err;
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}
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return 0;
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out_err:
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tpm_tis_ready(chip);
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release_locality(chip, chip->vendor.locality, 0);
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return rc;
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}
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/*
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* If interrupts are used (signaled by an irq set in the vendor structure)
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* tpm.c can skip polling for the data to be available as the interrupt is
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* waited for here
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*/
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static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
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{
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int rc;
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u32 ordinal;
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rc = tpm_tis_send_data(chip, buf, len);
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if (rc < 0)
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return rc;
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/* go and do it */
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iowrite8(TPM_STS_GO,
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chip->vendor.iobase + TPM_STS(chip->vendor.locality));
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if (chip->vendor.irq) {
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ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
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if (wait_for_tpm_stat
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(chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
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tpm_calc_ordinal_duration(chip, ordinal),
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&chip->vendor.read_queue, false) < 0) {
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rc = -ETIME;
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goto out_err;
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}
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}
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return len;
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out_err:
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tpm_tis_ready(chip);
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release_locality(chip, chip->vendor.locality, 0);
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return rc;
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}
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/*
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* Early probing for iTPM with STS_DATA_EXPECT flaw.
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* Try sending command without itpm flag set and if that
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* fails, repeat with itpm flag set.
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*/
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static int probe_itpm(struct tpm_chip *chip)
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{
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int rc = 0;
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u8 cmd_getticks[] = {
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0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a,
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0x00, 0x00, 0x00, 0xf1
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};
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size_t len = sizeof(cmd_getticks);
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bool rem_itpm = itpm;
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u16 vendor = ioread16(chip->vendor.iobase + TPM_DID_VID(0));
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/* probe only iTPMS */
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if (vendor != TPM_VID_INTEL)
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return 0;
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itpm = false;
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rc = tpm_tis_send_data(chip, cmd_getticks, len);
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if (rc == 0)
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goto out;
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tpm_tis_ready(chip);
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release_locality(chip, chip->vendor.locality, 0);
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itpm = true;
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rc = tpm_tis_send_data(chip, cmd_getticks, len);
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if (rc == 0) {
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dev_info(chip->dev, "Detected an iTPM.\n");
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rc = 1;
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} else
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rc = -EFAULT;
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out:
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itpm = rem_itpm;
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tpm_tis_ready(chip);
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release_locality(chip, chip->vendor.locality, 0);
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return rc;
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}
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static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status)
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{
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switch (chip->vendor.manufacturer_id) {
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case TPM_VID_WINBOND:
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return ((status == TPM_STS_VALID) ||
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(status == (TPM_STS_VALID | TPM_STS_COMMAND_READY)));
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case TPM_VID_STM:
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return (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY));
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default:
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return (status == TPM_STS_COMMAND_READY);
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}
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}
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|
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static const struct file_operations tis_ops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.open = tpm_open,
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.read = tpm_read,
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.write = tpm_write,
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.release = tpm_release,
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};
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|
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static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
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static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
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static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
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static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
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static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
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static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated,
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NULL);
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static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL);
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static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
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static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL);
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static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL);
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static struct attribute *tis_attrs[] = {
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&dev_attr_pubek.attr,
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&dev_attr_pcrs.attr,
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&dev_attr_enabled.attr,
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&dev_attr_active.attr,
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&dev_attr_owned.attr,
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&dev_attr_temp_deactivated.attr,
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&dev_attr_caps.attr,
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&dev_attr_cancel.attr,
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&dev_attr_durations.attr,
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&dev_attr_timeouts.attr, NULL,
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};
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|
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static struct attribute_group tis_attr_grp = {
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.attrs = tis_attrs
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};
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|
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static struct tpm_vendor_specific tpm_tis = {
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.status = tpm_tis_status,
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.recv = tpm_tis_recv,
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.send = tpm_tis_send,
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.cancel = tpm_tis_ready,
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.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
|
|
.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
|
|
.req_canceled = tpm_tis_req_canceled,
|
|
.attr_group = &tis_attr_grp,
|
|
.miscdev = {
|
|
.fops = &tis_ops,},
|
|
};
|
|
|
|
static irqreturn_t tis_int_probe(int irq, void *dev_id)
|
|
{
|
|
struct tpm_chip *chip = dev_id;
|
|
u32 interrupt;
|
|
|
|
interrupt = ioread32(chip->vendor.iobase +
|
|
TPM_INT_STATUS(chip->vendor.locality));
|
|
|
|
if (interrupt == 0)
|
|
return IRQ_NONE;
|
|
|
|
chip->vendor.probed_irq = irq;
|
|
|
|
/* Clear interrupts handled with TPM_EOI */
|
|
iowrite32(interrupt,
|
|
chip->vendor.iobase +
|
|
TPM_INT_STATUS(chip->vendor.locality));
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t tis_int_handler(int dummy, void *dev_id)
|
|
{
|
|
struct tpm_chip *chip = dev_id;
|
|
u32 interrupt;
|
|
int i;
|
|
|
|
interrupt = ioread32(chip->vendor.iobase +
|
|
TPM_INT_STATUS(chip->vendor.locality));
|
|
|
|
if (interrupt == 0)
|
|
return IRQ_NONE;
|
|
|
|
if (interrupt & TPM_INTF_DATA_AVAIL_INT)
|
|
wake_up_interruptible(&chip->vendor.read_queue);
|
|
if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT)
|
|
for (i = 0; i < 5; i++)
|
|
if (check_locality(chip, i) >= 0)
|
|
break;
|
|
if (interrupt &
|
|
(TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT |
|
|
TPM_INTF_CMD_READY_INT))
|
|
wake_up_interruptible(&chip->vendor.int_queue);
|
|
|
|
/* Clear interrupts handled with TPM_EOI */
|
|
iowrite32(interrupt,
|
|
chip->vendor.iobase +
|
|
TPM_INT_STATUS(chip->vendor.locality));
|
|
ioread32(chip->vendor.iobase + TPM_INT_STATUS(chip->vendor.locality));
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static bool interrupts = true;
|
|
module_param(interrupts, bool, 0444);
|
|
MODULE_PARM_DESC(interrupts, "Enable interrupts");
|
|
|
|
static int tpm_tis_init(struct device *dev, resource_size_t start,
|
|
resource_size_t len, unsigned int irq)
|
|
{
|
|
u32 vendor, intfcaps, intmask;
|
|
int rc, i, irq_s, irq_e, probe;
|
|
struct tpm_chip *chip;
|
|
|
|
if (!(chip = tpm_register_hardware(dev, &tpm_tis)))
|
|
return -ENODEV;
|
|
|
|
chip->vendor.iobase = ioremap(start, len);
|
|
if (!chip->vendor.iobase) {
|
|
rc = -EIO;
|
|
goto out_err;
|
|
}
|
|
|
|
/* Default timeouts */
|
|
chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
|
|
chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
|
|
chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
|
|
chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
|
|
|
|
if (wait_startup(chip, 0) != 0) {
|
|
rc = -ENODEV;
|
|
goto out_err;
|
|
}
|
|
|
|
if (request_locality(chip, 0) != 0) {
|
|
rc = -ENODEV;
|
|
goto out_err;
|
|
}
|
|
|
|
vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
|
|
chip->vendor.manufacturer_id = vendor;
|
|
|
|
dev_info(dev,
|
|
"1.2 TPM (device-id 0x%X, rev-id %d)\n",
|
|
vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
|
|
|
|
if (!itpm) {
|
|
probe = probe_itpm(chip);
|
|
if (probe < 0) {
|
|
rc = -ENODEV;
|
|
goto out_err;
|
|
}
|
|
itpm = !!probe;
|
|
}
|
|
|
|
if (itpm)
|
|
dev_info(dev, "Intel iTPM workaround enabled\n");
|
|
|
|
|
|
/* Figure out the capabilities */
|
|
intfcaps =
|
|
ioread32(chip->vendor.iobase +
|
|
TPM_INTF_CAPS(chip->vendor.locality));
|
|
dev_dbg(dev, "TPM interface capabilities (0x%x):\n",
|
|
intfcaps);
|
|
if (intfcaps & TPM_INTF_BURST_COUNT_STATIC)
|
|
dev_dbg(dev, "\tBurst Count Static\n");
|
|
if (intfcaps & TPM_INTF_CMD_READY_INT)
|
|
dev_dbg(dev, "\tCommand Ready Int Support\n");
|
|
if (intfcaps & TPM_INTF_INT_EDGE_FALLING)
|
|
dev_dbg(dev, "\tInterrupt Edge Falling\n");
|
|
if (intfcaps & TPM_INTF_INT_EDGE_RISING)
|
|
dev_dbg(dev, "\tInterrupt Edge Rising\n");
|
|
if (intfcaps & TPM_INTF_INT_LEVEL_LOW)
|
|
dev_dbg(dev, "\tInterrupt Level Low\n");
|
|
if (intfcaps & TPM_INTF_INT_LEVEL_HIGH)
|
|
dev_dbg(dev, "\tInterrupt Level High\n");
|
|
if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT)
|
|
dev_dbg(dev, "\tLocality Change Int Support\n");
|
|
if (intfcaps & TPM_INTF_STS_VALID_INT)
|
|
dev_dbg(dev, "\tSts Valid Int Support\n");
|
|
if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
|
|
dev_dbg(dev, "\tData Avail Int Support\n");
|
|
|
|
/* get the timeouts before testing for irqs */
|
|
if (tpm_get_timeouts(chip)) {
|
|
dev_err(dev, "Could not get TPM timeouts and durations\n");
|
|
rc = -ENODEV;
|
|
goto out_err;
|
|
}
|
|
|
|
if (tpm_do_selftest(chip)) {
|
|
dev_err(dev, "TPM self test failed\n");
|
|
rc = -ENODEV;
|
|
goto out_err;
|
|
}
|
|
|
|
/* INTERRUPT Setup */
|
|
init_waitqueue_head(&chip->vendor.read_queue);
|
|
init_waitqueue_head(&chip->vendor.int_queue);
|
|
|
|
intmask =
|
|
ioread32(chip->vendor.iobase +
|
|
TPM_INT_ENABLE(chip->vendor.locality));
|
|
|
|
intmask |= TPM_INTF_CMD_READY_INT
|
|
| TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
|
|
| TPM_INTF_STS_VALID_INT;
|
|
|
|
iowrite32(intmask,
|
|
chip->vendor.iobase +
|
|
TPM_INT_ENABLE(chip->vendor.locality));
|
|
if (interrupts)
|
|
chip->vendor.irq = irq;
|
|
if (interrupts && !chip->vendor.irq) {
|
|
irq_s =
|
|
ioread8(chip->vendor.iobase +
|
|
TPM_INT_VECTOR(chip->vendor.locality));
|
|
if (irq_s) {
|
|
irq_e = irq_s;
|
|
} else {
|
|
irq_s = 3;
|
|
irq_e = 15;
|
|
}
|
|
|
|
for (i = irq_s; i <= irq_e && chip->vendor.irq == 0; i++) {
|
|
iowrite8(i, chip->vendor.iobase +
|
|
TPM_INT_VECTOR(chip->vendor.locality));
|
|
if (request_irq
|
|
(i, tis_int_probe, IRQF_SHARED,
|
|
chip->vendor.miscdev.name, chip) != 0) {
|
|
dev_info(chip->dev,
|
|
"Unable to request irq: %d for probe\n",
|
|
i);
|
|
continue;
|
|
}
|
|
|
|
/* Clear all existing */
|
|
iowrite32(ioread32
|
|
(chip->vendor.iobase +
|
|
TPM_INT_STATUS(chip->vendor.locality)),
|
|
chip->vendor.iobase +
|
|
TPM_INT_STATUS(chip->vendor.locality));
|
|
|
|
/* Turn on */
|
|
iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
|
|
chip->vendor.iobase +
|
|
TPM_INT_ENABLE(chip->vendor.locality));
|
|
|
|
chip->vendor.probed_irq = 0;
|
|
|
|
/* Generate Interrupts */
|
|
tpm_gen_interrupt(chip);
|
|
|
|
chip->vendor.irq = chip->vendor.probed_irq;
|
|
|
|
/* free_irq will call into tis_int_probe;
|
|
clear all irqs we haven't seen while doing
|
|
tpm_gen_interrupt */
|
|
iowrite32(ioread32
|
|
(chip->vendor.iobase +
|
|
TPM_INT_STATUS(chip->vendor.locality)),
|
|
chip->vendor.iobase +
|
|
TPM_INT_STATUS(chip->vendor.locality));
|
|
|
|
/* Turn off */
|
|
iowrite32(intmask,
|
|
chip->vendor.iobase +
|
|
TPM_INT_ENABLE(chip->vendor.locality));
|
|
free_irq(i, chip);
|
|
}
|
|
}
|
|
if (chip->vendor.irq) {
|
|
iowrite8(chip->vendor.irq,
|
|
chip->vendor.iobase +
|
|
TPM_INT_VECTOR(chip->vendor.locality));
|
|
if (request_irq
|
|
(chip->vendor.irq, tis_int_handler, IRQF_SHARED,
|
|
chip->vendor.miscdev.name, chip) != 0) {
|
|
dev_info(chip->dev,
|
|
"Unable to request irq: %d for use\n",
|
|
chip->vendor.irq);
|
|
chip->vendor.irq = 0;
|
|
} else {
|
|
/* Clear all existing */
|
|
iowrite32(ioread32
|
|
(chip->vendor.iobase +
|
|
TPM_INT_STATUS(chip->vendor.locality)),
|
|
chip->vendor.iobase +
|
|
TPM_INT_STATUS(chip->vendor.locality));
|
|
|
|
/* Turn on */
|
|
iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
|
|
chip->vendor.iobase +
|
|
TPM_INT_ENABLE(chip->vendor.locality));
|
|
}
|
|
}
|
|
|
|
INIT_LIST_HEAD(&chip->vendor.list);
|
|
mutex_lock(&tis_lock);
|
|
list_add(&chip->vendor.list, &tis_chips);
|
|
mutex_unlock(&tis_lock);
|
|
|
|
|
|
return 0;
|
|
out_err:
|
|
if (chip->vendor.iobase)
|
|
iounmap(chip->vendor.iobase);
|
|
tpm_remove_hardware(chip->dev);
|
|
return rc;
|
|
}
|
|
|
|
#if defined(CONFIG_PNP) || defined(CONFIG_PM_SLEEP)
|
|
static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
|
|
{
|
|
u32 intmask;
|
|
|
|
/* reenable interrupts that device may have lost or
|
|
BIOS/firmware may have disabled */
|
|
iowrite8(chip->vendor.irq, chip->vendor.iobase +
|
|
TPM_INT_VECTOR(chip->vendor.locality));
|
|
|
|
intmask =
|
|
ioread32(chip->vendor.iobase +
|
|
TPM_INT_ENABLE(chip->vendor.locality));
|
|
|
|
intmask |= TPM_INTF_CMD_READY_INT
|
|
| TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
|
|
| TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE;
|
|
|
|
iowrite32(intmask,
|
|
chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality));
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int tpm_tis_resume(struct device *dev)
|
|
{
|
|
struct tpm_chip *chip = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
if (chip->vendor.irq)
|
|
tpm_tis_reenable_interrupts(chip);
|
|
|
|
ret = tpm_pm_resume(dev);
|
|
if (!ret)
|
|
tpm_do_selftest(chip);
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);
|
|
|
|
#ifdef CONFIG_PNP
|
|
static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
|
|
const struct pnp_device_id *pnp_id)
|
|
{
|
|
resource_size_t start, len;
|
|
unsigned int irq = 0;
|
|
|
|
start = pnp_mem_start(pnp_dev, 0);
|
|
len = pnp_mem_len(pnp_dev, 0);
|
|
|
|
if (pnp_irq_valid(pnp_dev, 0))
|
|
irq = pnp_irq(pnp_dev, 0);
|
|
else
|
|
interrupts = false;
|
|
|
|
if (is_itpm(pnp_dev))
|
|
itpm = true;
|
|
|
|
return tpm_tis_init(&pnp_dev->dev, start, len, irq);
|
|
}
|
|
|
|
static struct pnp_device_id tpm_pnp_tbl[] = {
|
|
{"PNP0C31", 0}, /* TPM */
|
|
{"ATM1200", 0}, /* Atmel */
|
|
{"IFX0102", 0}, /* Infineon */
|
|
{"BCM0101", 0}, /* Broadcom */
|
|
{"BCM0102", 0}, /* Broadcom */
|
|
{"NSC1200", 0}, /* National */
|
|
{"ICO0102", 0}, /* Intel */
|
|
/* Add new here */
|
|
{"", 0}, /* User Specified */
|
|
{"", 0} /* Terminator */
|
|
};
|
|
MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);
|
|
|
|
static void tpm_tis_pnp_remove(struct pnp_dev *dev)
|
|
{
|
|
struct tpm_chip *chip = pnp_get_drvdata(dev);
|
|
|
|
tpm_dev_vendor_release(chip);
|
|
|
|
kfree(chip);
|
|
}
|
|
|
|
|
|
static struct pnp_driver tis_pnp_driver = {
|
|
.name = "tpm_tis",
|
|
.id_table = tpm_pnp_tbl,
|
|
.probe = tpm_tis_pnp_init,
|
|
.remove = tpm_tis_pnp_remove,
|
|
#ifdef CONFIG_PM_SLEEP
|
|
.driver = {
|
|
.pm = &tpm_tis_pm,
|
|
},
|
|
#endif
|
|
};
|
|
|
|
#define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
|
|
module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
|
|
sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
|
|
MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
|
|
#endif
|
|
|
|
static struct platform_driver tis_drv = {
|
|
.driver = {
|
|
.name = "tpm_tis",
|
|
.owner = THIS_MODULE,
|
|
.pm = &tpm_tis_pm,
|
|
},
|
|
};
|
|
|
|
static struct platform_device *pdev;
|
|
|
|
static bool force;
|
|
module_param(force, bool, 0444);
|
|
MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
|
|
static int __init init_tis(void)
|
|
{
|
|
int rc;
|
|
#ifdef CONFIG_PNP
|
|
if (!force)
|
|
return pnp_register_driver(&tis_pnp_driver);
|
|
#endif
|
|
|
|
rc = platform_driver_register(&tis_drv);
|
|
if (rc < 0)
|
|
return rc;
|
|
pdev = platform_device_register_simple("tpm_tis", -1, NULL, 0);
|
|
if (IS_ERR(pdev)) {
|
|
rc = PTR_ERR(pdev);
|
|
goto err_dev;
|
|
}
|
|
rc = tpm_tis_init(&pdev->dev, TIS_MEM_BASE, TIS_MEM_LEN, 0);
|
|
if (rc)
|
|
goto err_init;
|
|
return 0;
|
|
err_init:
|
|
platform_device_unregister(pdev);
|
|
err_dev:
|
|
platform_driver_unregister(&tis_drv);
|
|
return rc;
|
|
}
|
|
|
|
static void __exit cleanup_tis(void)
|
|
{
|
|
struct tpm_vendor_specific *i, *j;
|
|
struct tpm_chip *chip;
|
|
mutex_lock(&tis_lock);
|
|
list_for_each_entry_safe(i, j, &tis_chips, list) {
|
|
chip = to_tpm_chip(i);
|
|
tpm_remove_hardware(chip->dev);
|
|
iowrite32(~TPM_GLOBAL_INT_ENABLE &
|
|
ioread32(chip->vendor.iobase +
|
|
TPM_INT_ENABLE(chip->vendor.
|
|
locality)),
|
|
chip->vendor.iobase +
|
|
TPM_INT_ENABLE(chip->vendor.locality));
|
|
release_locality(chip, chip->vendor.locality, 1);
|
|
if (chip->vendor.irq)
|
|
free_irq(chip->vendor.irq, chip);
|
|
iounmap(i->iobase);
|
|
list_del(&i->list);
|
|
}
|
|
mutex_unlock(&tis_lock);
|
|
#ifdef CONFIG_PNP
|
|
if (!force) {
|
|
pnp_unregister_driver(&tis_pnp_driver);
|
|
return;
|
|
}
|
|
#endif
|
|
platform_device_unregister(pdev);
|
|
platform_driver_unregister(&tis_drv);
|
|
}
|
|
|
|
module_init(init_tis);
|
|
module_exit(cleanup_tis);
|
|
MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
|
|
MODULE_DESCRIPTION("TPM Driver");
|
|
MODULE_VERSION("2.0");
|
|
MODULE_LICENSE("GPL");
|