2 * Copyright (C) 2005, 2006 IBM Corporation
3 * Copyright (C) 2014, 2015 Intel Corporation
6 * Leendert van Doorn <leendert@watson.ibm.com>
7 * Kylene Hall <kjhall@us.ibm.com>
9 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
11 * Device driver for TCG/TCPA TPM (trusted platform module).
12 * Specifications at www.trustedcomputinggroup.org
14 * This device driver implements the TPM interface as defined in
15 * the TCG TPM Interface Spec version 1.2, revision 1.0.
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License as
19 * published by the Free Software Foundation, version 2 of the
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/moduleparam.h>
25 #include <linux/pnp.h>
26 #include <linux/slab.h>
27 #include <linux/interrupt.h>
28 #include <linux/wait.h>
29 #include <linux/acpi.h>
30 #include <linux/freezer.h>
34 TPM_ACCESS_VALID = 0x80,
35 TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
36 TPM_ACCESS_REQUEST_PENDING = 0x04,
37 TPM_ACCESS_REQUEST_USE = 0x02,
42 TPM_STS_COMMAND_READY = 0x40,
44 TPM_STS_DATA_AVAIL = 0x10,
45 TPM_STS_DATA_EXPECT = 0x08,
49 TPM_GLOBAL_INT_ENABLE = 0x80000000,
50 TPM_INTF_BURST_COUNT_STATIC = 0x100,
51 TPM_INTF_CMD_READY_INT = 0x080,
52 TPM_INTF_INT_EDGE_FALLING = 0x040,
53 TPM_INTF_INT_EDGE_RISING = 0x020,
54 TPM_INTF_INT_LEVEL_LOW = 0x010,
55 TPM_INTF_INT_LEVEL_HIGH = 0x008,
56 TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
57 TPM_INTF_STS_VALID_INT = 0x002,
58 TPM_INTF_DATA_AVAIL_INT = 0x001,
62 TIS_MEM_BASE = 0xFED40000,
64 TIS_SHORT_TIMEOUT = 750, /* ms */
65 TIS_LONG_TIMEOUT = 2000, /* 2 sec */
71 /* irq > 0 means: use irq $irq;
72 * irq = 0 means: autoprobe for an irq;
73 * irq = -1 means: no irq support
78 static struct tpm_info tis_default_info = {
79 .start = TIS_MEM_BASE,
84 /* Some timeout values are needed before it is known whether the chip is
87 #define TIS_TIMEOUT_A_MAX max(TIS_SHORT_TIMEOUT, TPM2_TIMEOUT_A)
88 #define TIS_TIMEOUT_B_MAX max(TIS_LONG_TIMEOUT, TPM2_TIMEOUT_B)
89 #define TIS_TIMEOUT_C_MAX max(TIS_SHORT_TIMEOUT, TPM2_TIMEOUT_C)
90 #define TIS_TIMEOUT_D_MAX max(TIS_SHORT_TIMEOUT, TPM2_TIMEOUT_D)
92 #define TPM_ACCESS(l) (0x0000 | ((l) << 12))
93 #define TPM_INT_ENABLE(l) (0x0008 | ((l) << 12))
94 #define TPM_INT_VECTOR(l) (0x000C | ((l) << 12))
95 #define TPM_INT_STATUS(l) (0x0010 | ((l) << 12))
96 #define TPM_INTF_CAPS(l) (0x0014 | ((l) << 12))
97 #define TPM_STS(l) (0x0018 | ((l) << 12))
98 #define TPM_STS3(l) (0x001b | ((l) << 12))
99 #define TPM_DATA_FIFO(l) (0x0024 | ((l) << 12))
101 #define TPM_DID_VID(l) (0x0F00 | ((l) << 12))
102 #define TPM_RID(l) (0x0F04 | ((l) << 12))
108 #if defined(CONFIG_PNP) && defined(CONFIG_ACPI)
109 static int has_hid(struct acpi_device *dev, const char *hid)
111 struct acpi_hardware_id *id;
113 list_for_each_entry(id, &dev->pnp.ids, list)
114 if (!strcmp(hid, id->id))
120 static inline int is_itpm(struct acpi_device *dev)
122 return has_hid(dev, "INTC0102");
125 static inline int is_fifo(struct acpi_device *dev)
127 struct acpi_table_tpm2 *tbl;
131 if (!has_hid(dev, "MSFT0101"))
134 st = acpi_get_table(ACPI_SIG_TPM2, 1,
135 (struct acpi_table_header **) &tbl);
136 if (ACPI_FAILURE(st)) {
137 dev_err(&dev->dev, "failed to get TPM2 ACPI table\n");
141 if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
148 static inline int is_itpm(struct acpi_device *dev)
153 static inline int is_fifo(struct acpi_device *dev)
159 /* Before we attempt to access the TPM we must see that the valid bit is set.
160 * The specification says that this bit is 0 at reset and remains 0 until the
161 * 'TPM has gone through its self test and initialization and has established
162 * correct values in the other bits.' */
163 static int wait_startup(struct tpm_chip *chip, int l)
165 unsigned long stop = jiffies + chip->vendor.timeout_a;
167 if (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
171 } while (time_before(jiffies, stop));
175 static int check_locality(struct tpm_chip *chip, int l)
177 if ((ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
178 (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
179 (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
180 return chip->vendor.locality = l;
185 static void release_locality(struct tpm_chip *chip, int l, int force)
187 if (force || (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
188 (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
189 (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID))
190 iowrite8(TPM_ACCESS_ACTIVE_LOCALITY,
191 chip->vendor.iobase + TPM_ACCESS(l));
194 static int request_locality(struct tpm_chip *chip, int l)
196 unsigned long stop, timeout;
199 if (check_locality(chip, l) >= 0)
202 iowrite8(TPM_ACCESS_REQUEST_USE,
203 chip->vendor.iobase + TPM_ACCESS(l));
205 stop = jiffies + chip->vendor.timeout_a;
207 if (chip->vendor.irq) {
209 timeout = stop - jiffies;
210 if ((long)timeout <= 0)
212 rc = wait_event_interruptible_timeout(chip->vendor.int_queue,
218 if (rc == -ERESTARTSYS && freezing(current)) {
219 clear_thread_flag(TIF_SIGPENDING);
223 /* wait for burstcount */
225 if (check_locality(chip, l) >= 0)
229 while (time_before(jiffies, stop));
234 static u8 tpm_tis_status(struct tpm_chip *chip)
236 return ioread8(chip->vendor.iobase +
237 TPM_STS(chip->vendor.locality));
240 static void tpm_tis_ready(struct tpm_chip *chip)
242 /* this causes the current command to be aborted */
243 iowrite8(TPM_STS_COMMAND_READY,
244 chip->vendor.iobase + TPM_STS(chip->vendor.locality));
247 static int get_burstcount(struct tpm_chip *chip)
252 /* wait for burstcount */
253 /* which timeout value, spec has 2 answers (c & d) */
254 stop = jiffies + chip->vendor.timeout_d;
256 burstcnt = ioread8(chip->vendor.iobase +
257 TPM_STS(chip->vendor.locality) + 1);
258 burstcnt += ioread8(chip->vendor.iobase +
259 TPM_STS(chip->vendor.locality) +
264 } while (time_before(jiffies, stop));
268 static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
270 int size = 0, burstcnt;
271 while (size < count &&
272 wait_for_tpm_stat(chip,
273 TPM_STS_DATA_AVAIL | TPM_STS_VALID,
274 chip->vendor.timeout_c,
275 &chip->vendor.read_queue, true)
277 burstcnt = get_burstcount(chip);
278 for (; burstcnt > 0 && size < count; burstcnt--)
279 buf[size++] = ioread8(chip->vendor.iobase +
280 TPM_DATA_FIFO(chip->vendor.
286 static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
289 int expected, status;
291 if (count < TPM_HEADER_SIZE) {
296 /* read first 10 bytes, including tag, paramsize, and result */
298 recv_data(chip, buf, TPM_HEADER_SIZE)) < TPM_HEADER_SIZE) {
299 dev_err(chip->pdev, "Unable to read header\n");
303 expected = be32_to_cpu(*(__be32 *) (buf + 2));
304 if (expected > count) {
310 recv_data(chip, &buf[TPM_HEADER_SIZE],
311 expected - TPM_HEADER_SIZE)) < expected) {
312 dev_err(chip->pdev, "Unable to read remainder of result\n");
317 wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
318 &chip->vendor.int_queue, false);
319 status = tpm_tis_status(chip);
320 if (status & TPM_STS_DATA_AVAIL) { /* retry? */
321 dev_err(chip->pdev, "Error left over data\n");
328 release_locality(chip, chip->vendor.locality, 0);
333 module_param(itpm, bool, 0444);
334 MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");
337 * If interrupts are used (signaled by an irq set in the vendor structure)
338 * tpm.c can skip polling for the data to be available as the interrupt is
341 static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
343 int rc, status, burstcnt;
346 if (request_locality(chip, 0) < 0)
349 status = tpm_tis_status(chip);
350 if ((status & TPM_STS_COMMAND_READY) == 0) {
352 if (wait_for_tpm_stat
353 (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
354 &chip->vendor.int_queue, false) < 0) {
360 while (count < len - 1) {
361 burstcnt = get_burstcount(chip);
362 for (; burstcnt > 0 && count < len - 1; burstcnt--) {
363 iowrite8(buf[count], chip->vendor.iobase +
364 TPM_DATA_FIFO(chip->vendor.locality));
368 wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
369 &chip->vendor.int_queue, false);
370 status = tpm_tis_status(chip);
371 if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
377 /* write last byte */
379 chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality));
380 wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
381 &chip->vendor.int_queue, false);
382 status = tpm_tis_status(chip);
383 if ((status & TPM_STS_DATA_EXPECT) != 0) {
392 release_locality(chip, chip->vendor.locality, 0);
396 static void disable_interrupts(struct tpm_chip *chip)
401 ioread32(chip->vendor.iobase +
402 TPM_INT_ENABLE(chip->vendor.locality));
403 intmask &= ~TPM_GLOBAL_INT_ENABLE;
405 chip->vendor.iobase +
406 TPM_INT_ENABLE(chip->vendor.locality));
407 devm_free_irq(chip->pdev, chip->vendor.irq, chip);
408 chip->vendor.irq = 0;
412 * If interrupts are used (signaled by an irq set in the vendor structure)
413 * tpm.c can skip polling for the data to be available as the interrupt is
416 static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len)
422 rc = tpm_tis_send_data(chip, buf, len);
428 chip->vendor.iobase + TPM_STS(chip->vendor.locality));
430 if (chip->vendor.irq) {
431 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
433 if (chip->flags & TPM_CHIP_FLAG_TPM2)
434 dur = tpm2_calc_ordinal_duration(chip, ordinal);
436 dur = tpm_calc_ordinal_duration(chip, ordinal);
438 if (wait_for_tpm_stat
439 (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, dur,
440 &chip->vendor.read_queue, false) < 0) {
448 release_locality(chip, chip->vendor.locality, 0);
452 static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
455 struct priv_data *priv = chip->vendor.priv;
457 if (!chip->vendor.irq || priv->irq_tested)
458 return tpm_tis_send_main(chip, buf, len);
460 /* Verify receipt of the expected IRQ */
461 irq = chip->vendor.irq;
462 chip->vendor.irq = 0;
463 rc = tpm_tis_send_main(chip, buf, len);
464 chip->vendor.irq = irq;
465 if (!priv->irq_tested)
467 if (!priv->irq_tested)
468 disable_interrupts(chip);
469 priv->irq_tested = true;
473 struct tis_vendor_timeout_override {
475 unsigned long timeout_us[4];
478 static const struct tis_vendor_timeout_override vendor_timeout_overrides[] = {
480 { 0x32041114, { (TIS_SHORT_TIMEOUT*1000), (TIS_LONG_TIMEOUT*1000),
481 (TIS_SHORT_TIMEOUT*1000), (TIS_SHORT_TIMEOUT*1000) } },
484 static bool tpm_tis_update_timeouts(struct tpm_chip *chip,
485 unsigned long *timeout_cap)
490 did_vid = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
492 for (i = 0; i != ARRAY_SIZE(vendor_timeout_overrides); i++) {
493 if (vendor_timeout_overrides[i].did_vid != did_vid)
495 memcpy(timeout_cap, vendor_timeout_overrides[i].timeout_us,
496 sizeof(vendor_timeout_overrides[i].timeout_us));
504 * Early probing for iTPM with STS_DATA_EXPECT flaw.
505 * Try sending command without itpm flag set and if that
506 * fails, repeat with itpm flag set.
508 static int probe_itpm(struct tpm_chip *chip)
511 u8 cmd_getticks[] = {
512 0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a,
513 0x00, 0x00, 0x00, 0xf1
515 size_t len = sizeof(cmd_getticks);
516 bool rem_itpm = itpm;
517 u16 vendor = ioread16(chip->vendor.iobase + TPM_DID_VID(0));
519 /* probe only iTPMS */
520 if (vendor != TPM_VID_INTEL)
525 rc = tpm_tis_send_data(chip, cmd_getticks, len);
530 release_locality(chip, chip->vendor.locality, 0);
534 rc = tpm_tis_send_data(chip, cmd_getticks, len);
536 dev_info(chip->pdev, "Detected an iTPM.\n");
544 release_locality(chip, chip->vendor.locality, 0);
549 static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status)
551 switch (chip->vendor.manufacturer_id) {
552 case TPM_VID_WINBOND:
553 return ((status == TPM_STS_VALID) ||
554 (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY)));
556 return (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY));
558 return (status == TPM_STS_COMMAND_READY);
562 static const struct tpm_class_ops tpm_tis = {
563 .status = tpm_tis_status,
564 .recv = tpm_tis_recv,
565 .send = tpm_tis_send,
566 .cancel = tpm_tis_ready,
567 .update_timeouts = tpm_tis_update_timeouts,
568 .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
569 .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
570 .req_canceled = tpm_tis_req_canceled,
573 static irqreturn_t tis_int_handler(int dummy, void *dev_id)
575 struct tpm_chip *chip = dev_id;
579 interrupt = ioread32(chip->vendor.iobase +
580 TPM_INT_STATUS(chip->vendor.locality));
585 ((struct priv_data *)chip->vendor.priv)->irq_tested = true;
586 if (interrupt & TPM_INTF_DATA_AVAIL_INT)
587 wake_up_interruptible(&chip->vendor.read_queue);
588 if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT)
589 for (i = 0; i < 5; i++)
590 if (check_locality(chip, i) >= 0)
593 (TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT |
594 TPM_INTF_CMD_READY_INT))
595 wake_up_interruptible(&chip->vendor.int_queue);
597 /* Clear interrupts handled with TPM_EOI */
599 chip->vendor.iobase +
600 TPM_INT_STATUS(chip->vendor.locality));
601 ioread32(chip->vendor.iobase + TPM_INT_STATUS(chip->vendor.locality));
605 /* Register the IRQ and issue a command that will cause an interrupt. If an
606 * irq is seen then leave the chip setup for IRQ operation, otherwise reverse
607 * everything and leave in polling mode. Returns 0 on success.
609 static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask,
612 struct priv_data *priv = chip->vendor.priv;
615 if (devm_request_irq(chip->pdev, irq, tis_int_handler, flags,
616 chip->devname, chip) != 0) {
617 dev_info(chip->pdev, "Unable to request irq: %d for probe\n",
621 chip->vendor.irq = irq;
623 original_int_vec = ioread8(chip->vendor.iobase +
624 TPM_INT_VECTOR(chip->vendor.locality));
626 chip->vendor.iobase + TPM_INT_VECTOR(chip->vendor.locality));
628 /* Clear all existing */
629 iowrite32(ioread32(chip->vendor.iobase +
630 TPM_INT_STATUS(chip->vendor.locality)),
631 chip->vendor.iobase + TPM_INT_STATUS(chip->vendor.locality));
634 iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
635 chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality));
637 priv->irq_tested = false;
639 /* Generate an interrupt by having the core call through to
642 if (chip->flags & TPM_CHIP_FLAG_TPM2)
643 tpm2_gen_interrupt(chip);
645 tpm_gen_interrupt(chip);
647 /* tpm_tis_send will either confirm the interrupt is working or it
648 * will call disable_irq which undoes all of the above.
650 if (!chip->vendor.irq) {
651 iowrite8(original_int_vec,
652 chip->vendor.iobase +
653 TPM_INT_VECTOR(chip->vendor.locality));
660 /* Try to find the IRQ the TPM is using. This is for legacy x86 systems that
661 * do not have ACPI/etc. We typically expect the interrupt to be declared if
664 static void tpm_tis_probe_irq(struct tpm_chip *chip, u32 intmask)
669 original_int_vec = ioread8(chip->vendor.iobase +
670 TPM_INT_VECTOR(chip->vendor.locality));
672 if (!original_int_vec) {
673 if (IS_ENABLED(CONFIG_X86))
674 for (i = 3; i <= 15; i++)
675 if (!tpm_tis_probe_irq_single(chip, intmask, 0,
678 } else if (!tpm_tis_probe_irq_single(chip, intmask, 0,
683 static bool interrupts = true;
684 module_param(interrupts, bool, 0444);
685 MODULE_PARM_DESC(interrupts, "Enable interrupts");
687 static void tpm_tis_remove(struct tpm_chip *chip)
689 if (chip->flags & TPM_CHIP_FLAG_TPM2)
690 tpm2_shutdown(chip, TPM2_SU_CLEAR);
692 iowrite32(~TPM_GLOBAL_INT_ENABLE &
693 ioread32(chip->vendor.iobase +
694 TPM_INT_ENABLE(chip->vendor.
696 chip->vendor.iobase +
697 TPM_INT_ENABLE(chip->vendor.locality));
698 release_locality(chip, chip->vendor.locality, 1);
701 static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
702 acpi_handle acpi_dev_handle)
704 u32 vendor, intfcaps, intmask;
706 struct tpm_chip *chip;
707 struct priv_data *priv;
709 priv = devm_kzalloc(dev, sizeof(struct priv_data), GFP_KERNEL);
713 chip = tpmm_chip_alloc(dev, &tpm_tis);
715 return PTR_ERR(chip);
717 chip->vendor.priv = priv;
719 chip->acpi_dev_handle = acpi_dev_handle;
722 chip->vendor.iobase = devm_ioremap(dev, tpm_info->start, tpm_info->len);
723 if (!chip->vendor.iobase)
726 /* Maximum timeouts */
727 chip->vendor.timeout_a = TIS_TIMEOUT_A_MAX;
728 chip->vendor.timeout_b = TIS_TIMEOUT_B_MAX;
729 chip->vendor.timeout_c = TIS_TIMEOUT_C_MAX;
730 chip->vendor.timeout_d = TIS_TIMEOUT_D_MAX;
732 if (wait_startup(chip, 0) != 0) {
737 /* Take control of the TPM's interrupt hardware and shut it off */
738 intmask = ioread32(chip->vendor.iobase +
739 TPM_INT_ENABLE(chip->vendor.locality));
740 intmask |= TPM_INTF_CMD_READY_INT | TPM_INTF_LOCALITY_CHANGE_INT |
741 TPM_INTF_DATA_AVAIL_INT | TPM_INTF_STS_VALID_INT;
742 intmask &= ~TPM_GLOBAL_INT_ENABLE;
744 chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality));
746 if (request_locality(chip, 0) != 0) {
751 rc = tpm2_probe(chip);
755 vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
756 chip->vendor.manufacturer_id = vendor;
758 dev_info(dev, "%s TPM (device-id 0x%X, rev-id %d)\n",
759 (chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2",
760 vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
763 probe = probe_itpm(chip);
772 dev_info(dev, "Intel iTPM workaround enabled\n");
775 /* Figure out the capabilities */
777 ioread32(chip->vendor.iobase +
778 TPM_INTF_CAPS(chip->vendor.locality));
779 dev_dbg(dev, "TPM interface capabilities (0x%x):\n",
781 if (intfcaps & TPM_INTF_BURST_COUNT_STATIC)
782 dev_dbg(dev, "\tBurst Count Static\n");
783 if (intfcaps & TPM_INTF_CMD_READY_INT)
784 dev_dbg(dev, "\tCommand Ready Int Support\n");
785 if (intfcaps & TPM_INTF_INT_EDGE_FALLING)
786 dev_dbg(dev, "\tInterrupt Edge Falling\n");
787 if (intfcaps & TPM_INTF_INT_EDGE_RISING)
788 dev_dbg(dev, "\tInterrupt Edge Rising\n");
789 if (intfcaps & TPM_INTF_INT_LEVEL_LOW)
790 dev_dbg(dev, "\tInterrupt Level Low\n");
791 if (intfcaps & TPM_INTF_INT_LEVEL_HIGH)
792 dev_dbg(dev, "\tInterrupt Level High\n");
793 if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT)
794 dev_dbg(dev, "\tLocality Change Int Support\n");
795 if (intfcaps & TPM_INTF_STS_VALID_INT)
796 dev_dbg(dev, "\tSts Valid Int Support\n");
797 if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
798 dev_dbg(dev, "\tData Avail Int Support\n");
800 /* Very early on issue a command to the TPM in polling mode to make
801 * sure it works. May as well use that command to set the proper
802 * timeouts for the driver.
804 if (tpm_get_timeouts(chip)) {
805 dev_err(dev, "Could not get TPM timeouts and durations\n");
810 /* INTERRUPT Setup */
811 init_waitqueue_head(&chip->vendor.read_queue);
812 init_waitqueue_head(&chip->vendor.int_queue);
813 if (interrupts && tpm_info->irq != -1) {
815 tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED,
817 if (!chip->vendor.irq)
818 dev_err(chip->pdev, FW_BUG
819 "TPM interrupt not working, polling instead\n");
821 tpm_tis_probe_irq(chip, intmask);
824 if (chip->flags & TPM_CHIP_FLAG_TPM2) {
825 rc = tpm2_do_selftest(chip);
826 if (rc == TPM2_RC_INITIALIZE) {
827 dev_warn(dev, "Firmware has not started TPM\n");
828 rc = tpm2_startup(chip, TPM2_SU_CLEAR);
830 rc = tpm2_do_selftest(chip);
834 dev_err(dev, "TPM self test failed\n");
840 if (tpm_do_selftest(chip)) {
841 dev_err(dev, "TPM self test failed\n");
847 return tpm_chip_register(chip);
849 tpm_tis_remove(chip);
853 #ifdef CONFIG_PM_SLEEP
854 static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
858 /* reenable interrupts that device may have lost or
859 BIOS/firmware may have disabled */
860 iowrite8(chip->vendor.irq, chip->vendor.iobase +
861 TPM_INT_VECTOR(chip->vendor.locality));
864 ioread32(chip->vendor.iobase +
865 TPM_INT_ENABLE(chip->vendor.locality));
867 intmask |= TPM_INTF_CMD_READY_INT
868 | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
869 | TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE;
872 chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality));
875 static int tpm_tis_resume(struct device *dev)
877 struct tpm_chip *chip = dev_get_drvdata(dev);
880 if (chip->vendor.irq)
881 tpm_tis_reenable_interrupts(chip);
883 ret = tpm_pm_resume(dev);
887 /* TPM 1.2 requires self-test on resume. This function actually returns
888 * an error code but for unknown reason it isn't handled.
890 if (!(chip->flags & TPM_CHIP_FLAG_TPM2))
891 tpm_do_selftest(chip);
897 static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);
900 static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
901 const struct pnp_device_id *pnp_id)
903 struct tpm_info tpm_info = {};
904 acpi_handle acpi_dev_handle = NULL;
906 tpm_info.start = pnp_mem_start(pnp_dev, 0);
907 tpm_info.len = pnp_mem_len(pnp_dev, 0);
909 if (pnp_irq_valid(pnp_dev, 0))
910 tpm_info.irq = pnp_irq(pnp_dev, 0);
915 if (pnp_acpi_device(pnp_dev)) {
916 if (is_itpm(pnp_acpi_device(pnp_dev)))
919 acpi_dev_handle = pnp_acpi_device(pnp_dev)->handle;
923 return tpm_tis_init(&pnp_dev->dev, &tpm_info, acpi_dev_handle);
926 static struct pnp_device_id tpm_pnp_tbl[] = {
927 {"PNP0C31", 0}, /* TPM */
928 {"ATM1200", 0}, /* Atmel */
929 {"IFX0102", 0}, /* Infineon */
930 {"BCM0101", 0}, /* Broadcom */
931 {"BCM0102", 0}, /* Broadcom */
932 {"NSC1200", 0}, /* National */
933 {"ICO0102", 0}, /* Intel */
935 {"", 0}, /* User Specified */
936 {"", 0} /* Terminator */
938 MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);
940 static void tpm_tis_pnp_remove(struct pnp_dev *dev)
942 struct tpm_chip *chip = pnp_get_drvdata(dev);
944 tpm_chip_unregister(chip);
945 tpm_tis_remove(chip);
948 static struct pnp_driver tis_pnp_driver = {
950 .id_table = tpm_pnp_tbl,
951 .probe = tpm_tis_pnp_init,
952 .remove = tpm_tis_pnp_remove,
958 #define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
959 module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
960 sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
961 MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
965 static int tpm_check_resource(struct acpi_resource *ares, void *data)
967 struct tpm_info *tpm_info = (struct tpm_info *) data;
970 if (acpi_dev_resource_interrupt(ares, 0, &res)) {
971 tpm_info->irq = res.start;
972 } else if (acpi_dev_resource_memory(ares, &res)) {
973 tpm_info->start = res.start;
974 tpm_info->len = resource_size(&res);
980 static int tpm_tis_acpi_init(struct acpi_device *acpi_dev)
982 struct list_head resources;
983 struct tpm_info tpm_info = tis_default_info;
986 if (!is_fifo(acpi_dev))
989 INIT_LIST_HEAD(&resources);
991 ret = acpi_dev_get_resources(acpi_dev, &resources, tpm_check_resource,
996 acpi_dev_free_resource_list(&resources);
998 if (is_itpm(acpi_dev))
1001 return tpm_tis_init(&acpi_dev->dev, &tpm_info, acpi_dev->handle);
1004 static int tpm_tis_acpi_remove(struct acpi_device *dev)
1006 struct tpm_chip *chip = dev_get_drvdata(&dev->dev);
1008 tpm_chip_unregister(chip);
1009 tpm_tis_remove(chip);
1014 static struct acpi_device_id tpm_acpi_tbl[] = {
1015 {"MSFT0101", 0}, /* TPM 2.0 */
1017 {"", 0}, /* User Specified */
1018 {"", 0} /* Terminator */
1020 MODULE_DEVICE_TABLE(acpi, tpm_acpi_tbl);
1022 static struct acpi_driver tis_acpi_driver = {
1024 .ids = tpm_acpi_tbl,
1026 .add = tpm_tis_acpi_init,
1027 .remove = tpm_tis_acpi_remove,
1035 static struct platform_driver tis_drv = {
1042 static struct platform_device *pdev;
1045 module_param(force, bool, 0444);
1046 MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
1047 static int __init init_tis(void)
1052 rc = pnp_register_driver(&tis_pnp_driver);
1059 rc = acpi_bus_register_driver(&tis_acpi_driver);
1062 pnp_unregister_driver(&tis_pnp_driver);
1071 rc = platform_driver_register(&tis_drv);
1074 pdev = platform_device_register_simple("tpm_tis", -1, NULL, 0);
1079 rc = tpm_tis_init(&pdev->dev, &tis_default_info, NULL);
1084 platform_device_unregister(pdev);
1086 platform_driver_unregister(&tis_drv);
1090 static void __exit cleanup_tis(void)
1092 struct tpm_chip *chip;
1093 #if defined(CONFIG_PNP) || defined(CONFIG_ACPI)
1096 acpi_bus_unregister_driver(&tis_acpi_driver);
1099 pnp_unregister_driver(&tis_pnp_driver);
1104 chip = dev_get_drvdata(&pdev->dev);
1105 tpm_chip_unregister(chip);
1106 tpm_tis_remove(chip);
1107 platform_device_unregister(pdev);
1108 platform_driver_unregister(&tis_drv);
1111 module_init(init_tis);
1112 module_exit(cleanup_tis);
1113 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1114 MODULE_DESCRIPTION("TPM Driver");
1115 MODULE_VERSION("2.0");
1116 MODULE_LICENSE("GPL");