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_itpm(struct acpi_device *dev)
131 /* Before we attempt to access the TPM we must see that the valid bit is set.
132 * The specification says that this bit is 0 at reset and remains 0 until the
133 * 'TPM has gone through its self test and initialization and has established
134 * correct values in the other bits.' */
135 static int wait_startup(struct tpm_chip *chip, int l)
137 unsigned long stop = jiffies + chip->vendor.timeout_a;
139 if (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
143 } while (time_before(jiffies, stop));
147 static int check_locality(struct tpm_chip *chip, int l)
149 if ((ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
150 (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
151 (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
152 return chip->vendor.locality = l;
157 static void release_locality(struct tpm_chip *chip, int l, int force)
159 if (force || (ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
160 (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
161 (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID))
162 iowrite8(TPM_ACCESS_ACTIVE_LOCALITY,
163 chip->vendor.iobase + TPM_ACCESS(l));
166 static int request_locality(struct tpm_chip *chip, int l)
168 unsigned long stop, timeout;
171 if (check_locality(chip, l) >= 0)
174 iowrite8(TPM_ACCESS_REQUEST_USE,
175 chip->vendor.iobase + TPM_ACCESS(l));
177 stop = jiffies + chip->vendor.timeout_a;
179 if (chip->vendor.irq) {
181 timeout = stop - jiffies;
182 if ((long)timeout <= 0)
184 rc = wait_event_interruptible_timeout(chip->vendor.int_queue,
190 if (rc == -ERESTARTSYS && freezing(current)) {
191 clear_thread_flag(TIF_SIGPENDING);
195 /* wait for burstcount */
197 if (check_locality(chip, l) >= 0)
201 while (time_before(jiffies, stop));
206 static u8 tpm_tis_status(struct tpm_chip *chip)
208 return ioread8(chip->vendor.iobase +
209 TPM_STS(chip->vendor.locality));
212 static void tpm_tis_ready(struct tpm_chip *chip)
214 /* this causes the current command to be aborted */
215 iowrite8(TPM_STS_COMMAND_READY,
216 chip->vendor.iobase + TPM_STS(chip->vendor.locality));
219 static int get_burstcount(struct tpm_chip *chip)
224 /* wait for burstcount */
225 /* which timeout value, spec has 2 answers (c & d) */
226 stop = jiffies + chip->vendor.timeout_d;
228 burstcnt = ioread8(chip->vendor.iobase +
229 TPM_STS(chip->vendor.locality) + 1);
230 burstcnt += ioread8(chip->vendor.iobase +
231 TPM_STS(chip->vendor.locality) +
236 } while (time_before(jiffies, stop));
240 static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
242 int size = 0, burstcnt;
243 while (size < count &&
244 wait_for_tpm_stat(chip,
245 TPM_STS_DATA_AVAIL | TPM_STS_VALID,
246 chip->vendor.timeout_c,
247 &chip->vendor.read_queue, true)
249 burstcnt = get_burstcount(chip);
250 for (; burstcnt > 0 && size < count; burstcnt--)
251 buf[size++] = ioread8(chip->vendor.iobase +
252 TPM_DATA_FIFO(chip->vendor.
258 static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
261 int expected, status;
263 if (count < TPM_HEADER_SIZE) {
268 /* read first 10 bytes, including tag, paramsize, and result */
270 recv_data(chip, buf, TPM_HEADER_SIZE)) < TPM_HEADER_SIZE) {
271 dev_err(chip->pdev, "Unable to read header\n");
275 expected = be32_to_cpu(*(__be32 *) (buf + 2));
276 if (expected > count) {
282 recv_data(chip, &buf[TPM_HEADER_SIZE],
283 expected - TPM_HEADER_SIZE)) < expected) {
284 dev_err(chip->pdev, "Unable to read remainder of result\n");
289 wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
290 &chip->vendor.int_queue, false);
291 status = tpm_tis_status(chip);
292 if (status & TPM_STS_DATA_AVAIL) { /* retry? */
293 dev_err(chip->pdev, "Error left over data\n");
300 release_locality(chip, chip->vendor.locality, 0);
305 module_param(itpm, bool, 0444);
306 MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");
309 * If interrupts are used (signaled by an irq set in the vendor structure)
310 * tpm.c can skip polling for the data to be available as the interrupt is
313 static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
315 int rc, status, burstcnt;
318 if (request_locality(chip, 0) < 0)
321 status = tpm_tis_status(chip);
322 if ((status & TPM_STS_COMMAND_READY) == 0) {
324 if (wait_for_tpm_stat
325 (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
326 &chip->vendor.int_queue, false) < 0) {
332 while (count < len - 1) {
333 burstcnt = get_burstcount(chip);
334 for (; burstcnt > 0 && count < len - 1; burstcnt--) {
335 iowrite8(buf[count], chip->vendor.iobase +
336 TPM_DATA_FIFO(chip->vendor.locality));
340 wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
341 &chip->vendor.int_queue, false);
342 status = tpm_tis_status(chip);
343 if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
349 /* write last byte */
351 chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality));
352 wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
353 &chip->vendor.int_queue, false);
354 status = tpm_tis_status(chip);
355 if ((status & TPM_STS_DATA_EXPECT) != 0) {
364 release_locality(chip, chip->vendor.locality, 0);
368 static void disable_interrupts(struct tpm_chip *chip)
373 ioread32(chip->vendor.iobase +
374 TPM_INT_ENABLE(chip->vendor.locality));
375 intmask &= ~TPM_GLOBAL_INT_ENABLE;
377 chip->vendor.iobase +
378 TPM_INT_ENABLE(chip->vendor.locality));
379 devm_free_irq(chip->pdev, chip->vendor.irq, chip);
380 chip->vendor.irq = 0;
384 * If interrupts are used (signaled by an irq set in the vendor structure)
385 * tpm.c can skip polling for the data to be available as the interrupt is
388 static int tpm_tis_send_main(struct tpm_chip *chip, u8 *buf, size_t len)
394 rc = tpm_tis_send_data(chip, buf, len);
400 chip->vendor.iobase + TPM_STS(chip->vendor.locality));
402 if (chip->vendor.irq) {
403 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
405 if (chip->flags & TPM_CHIP_FLAG_TPM2)
406 dur = tpm2_calc_ordinal_duration(chip, ordinal);
408 dur = tpm_calc_ordinal_duration(chip, ordinal);
410 if (wait_for_tpm_stat
411 (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID, dur,
412 &chip->vendor.read_queue, false) < 0) {
420 release_locality(chip, chip->vendor.locality, 0);
424 static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
427 struct priv_data *priv = chip->vendor.priv;
429 if (!chip->vendor.irq || priv->irq_tested)
430 return tpm_tis_send_main(chip, buf, len);
432 /* Verify receipt of the expected IRQ */
433 irq = chip->vendor.irq;
434 chip->vendor.irq = 0;
435 rc = tpm_tis_send_main(chip, buf, len);
436 chip->vendor.irq = irq;
437 if (!priv->irq_tested)
439 if (!priv->irq_tested)
440 disable_interrupts(chip);
441 priv->irq_tested = true;
445 struct tis_vendor_timeout_override {
447 unsigned long timeout_us[4];
450 static const struct tis_vendor_timeout_override vendor_timeout_overrides[] = {
452 { 0x32041114, { (TIS_SHORT_TIMEOUT*1000), (TIS_LONG_TIMEOUT*1000),
453 (TIS_SHORT_TIMEOUT*1000), (TIS_SHORT_TIMEOUT*1000) } },
456 static bool tpm_tis_update_timeouts(struct tpm_chip *chip,
457 unsigned long *timeout_cap)
462 did_vid = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
464 for (i = 0; i != ARRAY_SIZE(vendor_timeout_overrides); i++) {
465 if (vendor_timeout_overrides[i].did_vid != did_vid)
467 memcpy(timeout_cap, vendor_timeout_overrides[i].timeout_us,
468 sizeof(vendor_timeout_overrides[i].timeout_us));
476 * Early probing for iTPM with STS_DATA_EXPECT flaw.
477 * Try sending command without itpm flag set and if that
478 * fails, repeat with itpm flag set.
480 static int probe_itpm(struct tpm_chip *chip)
483 u8 cmd_getticks[] = {
484 0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a,
485 0x00, 0x00, 0x00, 0xf1
487 size_t len = sizeof(cmd_getticks);
488 bool rem_itpm = itpm;
489 u16 vendor = ioread16(chip->vendor.iobase + TPM_DID_VID(0));
491 /* probe only iTPMS */
492 if (vendor != TPM_VID_INTEL)
497 rc = tpm_tis_send_data(chip, cmd_getticks, len);
502 release_locality(chip, chip->vendor.locality, 0);
506 rc = tpm_tis_send_data(chip, cmd_getticks, len);
508 dev_info(chip->pdev, "Detected an iTPM.\n");
516 release_locality(chip, chip->vendor.locality, 0);
521 static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status)
523 switch (chip->vendor.manufacturer_id) {
524 case TPM_VID_WINBOND:
525 return ((status == TPM_STS_VALID) ||
526 (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY)));
528 return (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY));
530 return (status == TPM_STS_COMMAND_READY);
534 static const struct tpm_class_ops tpm_tis = {
535 .status = tpm_tis_status,
536 .recv = tpm_tis_recv,
537 .send = tpm_tis_send,
538 .cancel = tpm_tis_ready,
539 .update_timeouts = tpm_tis_update_timeouts,
540 .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
541 .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
542 .req_canceled = tpm_tis_req_canceled,
545 static irqreturn_t tis_int_handler(int dummy, void *dev_id)
547 struct tpm_chip *chip = dev_id;
551 interrupt = ioread32(chip->vendor.iobase +
552 TPM_INT_STATUS(chip->vendor.locality));
557 ((struct priv_data *)chip->vendor.priv)->irq_tested = true;
558 if (interrupt & TPM_INTF_DATA_AVAIL_INT)
559 wake_up_interruptible(&chip->vendor.read_queue);
560 if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT)
561 for (i = 0; i < 5; i++)
562 if (check_locality(chip, i) >= 0)
565 (TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT |
566 TPM_INTF_CMD_READY_INT))
567 wake_up_interruptible(&chip->vendor.int_queue);
569 /* Clear interrupts handled with TPM_EOI */
571 chip->vendor.iobase +
572 TPM_INT_STATUS(chip->vendor.locality));
573 ioread32(chip->vendor.iobase + TPM_INT_STATUS(chip->vendor.locality));
577 /* Register the IRQ and issue a command that will cause an interrupt. If an
578 * irq is seen then leave the chip setup for IRQ operation, otherwise reverse
579 * everything and leave in polling mode. Returns 0 on success.
581 static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask,
584 struct priv_data *priv = chip->vendor.priv;
587 if (devm_request_irq(chip->pdev, irq, tis_int_handler, flags,
588 chip->devname, chip) != 0) {
589 dev_info(chip->pdev, "Unable to request irq: %d for probe\n",
593 chip->vendor.irq = irq;
595 original_int_vec = ioread8(chip->vendor.iobase +
596 TPM_INT_VECTOR(chip->vendor.locality));
598 chip->vendor.iobase + TPM_INT_VECTOR(chip->vendor.locality));
600 /* Clear all existing */
601 iowrite32(ioread32(chip->vendor.iobase +
602 TPM_INT_STATUS(chip->vendor.locality)),
603 chip->vendor.iobase + TPM_INT_STATUS(chip->vendor.locality));
606 iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
607 chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality));
609 priv->irq_tested = false;
611 /* Generate an interrupt by having the core call through to
614 if (chip->flags & TPM_CHIP_FLAG_TPM2)
615 tpm2_gen_interrupt(chip);
617 tpm_gen_interrupt(chip);
619 /* tpm_tis_send will either confirm the interrupt is working or it
620 * will call disable_irq which undoes all of the above.
622 if (!chip->vendor.irq) {
623 iowrite8(original_int_vec,
624 chip->vendor.iobase +
625 TPM_INT_VECTOR(chip->vendor.locality));
632 /* Try to find the IRQ the TPM is using. This is for legacy x86 systems that
633 * do not have ACPI/etc. We typically expect the interrupt to be declared if
636 static void tpm_tis_probe_irq(struct tpm_chip *chip, u32 intmask)
641 original_int_vec = ioread8(chip->vendor.iobase +
642 TPM_INT_VECTOR(chip->vendor.locality));
644 if (!original_int_vec) {
645 if (IS_ENABLED(CONFIG_X86))
646 for (i = 3; i <= 15; i++)
647 if (!tpm_tis_probe_irq_single(chip, intmask, 0,
650 } else if (!tpm_tis_probe_irq_single(chip, intmask, 0,
655 static bool interrupts = true;
656 module_param(interrupts, bool, 0444);
657 MODULE_PARM_DESC(interrupts, "Enable interrupts");
659 static void tpm_tis_remove(struct tpm_chip *chip)
661 if (chip->flags & TPM_CHIP_FLAG_TPM2)
662 tpm2_shutdown(chip, TPM2_SU_CLEAR);
664 iowrite32(~TPM_GLOBAL_INT_ENABLE &
665 ioread32(chip->vendor.iobase +
666 TPM_INT_ENABLE(chip->vendor.
668 chip->vendor.iobase +
669 TPM_INT_ENABLE(chip->vendor.locality));
670 release_locality(chip, chip->vendor.locality, 1);
673 static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
674 acpi_handle acpi_dev_handle)
676 u32 vendor, intfcaps, intmask;
678 struct tpm_chip *chip;
679 struct priv_data *priv;
681 priv = devm_kzalloc(dev, sizeof(struct priv_data), GFP_KERNEL);
685 chip = tpmm_chip_alloc(dev, &tpm_tis);
687 return PTR_ERR(chip);
689 chip->vendor.priv = priv;
691 chip->acpi_dev_handle = acpi_dev_handle;
694 chip->vendor.iobase = devm_ioremap(dev, tpm_info->start, tpm_info->len);
695 if (!chip->vendor.iobase)
698 /* Maximum timeouts */
699 chip->vendor.timeout_a = TIS_TIMEOUT_A_MAX;
700 chip->vendor.timeout_b = TIS_TIMEOUT_B_MAX;
701 chip->vendor.timeout_c = TIS_TIMEOUT_C_MAX;
702 chip->vendor.timeout_d = TIS_TIMEOUT_D_MAX;
704 if (wait_startup(chip, 0) != 0) {
709 /* Take control of the TPM's interrupt hardware and shut it off */
710 intmask = ioread32(chip->vendor.iobase +
711 TPM_INT_ENABLE(chip->vendor.locality));
712 intmask |= TPM_INTF_CMD_READY_INT | TPM_INTF_LOCALITY_CHANGE_INT |
713 TPM_INTF_DATA_AVAIL_INT | TPM_INTF_STS_VALID_INT;
714 intmask &= ~TPM_GLOBAL_INT_ENABLE;
716 chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality));
718 if (request_locality(chip, 0) != 0) {
723 rc = tpm2_probe(chip);
727 vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
728 chip->vendor.manufacturer_id = vendor;
730 dev_info(dev, "%s TPM (device-id 0x%X, rev-id %d)\n",
731 (chip->flags & TPM_CHIP_FLAG_TPM2) ? "2.0" : "1.2",
732 vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
735 probe = probe_itpm(chip);
744 dev_info(dev, "Intel iTPM workaround enabled\n");
747 /* Figure out the capabilities */
749 ioread32(chip->vendor.iobase +
750 TPM_INTF_CAPS(chip->vendor.locality));
751 dev_dbg(dev, "TPM interface capabilities (0x%x):\n",
753 if (intfcaps & TPM_INTF_BURST_COUNT_STATIC)
754 dev_dbg(dev, "\tBurst Count Static\n");
755 if (intfcaps & TPM_INTF_CMD_READY_INT)
756 dev_dbg(dev, "\tCommand Ready Int Support\n");
757 if (intfcaps & TPM_INTF_INT_EDGE_FALLING)
758 dev_dbg(dev, "\tInterrupt Edge Falling\n");
759 if (intfcaps & TPM_INTF_INT_EDGE_RISING)
760 dev_dbg(dev, "\tInterrupt Edge Rising\n");
761 if (intfcaps & TPM_INTF_INT_LEVEL_LOW)
762 dev_dbg(dev, "\tInterrupt Level Low\n");
763 if (intfcaps & TPM_INTF_INT_LEVEL_HIGH)
764 dev_dbg(dev, "\tInterrupt Level High\n");
765 if (intfcaps & TPM_INTF_LOCALITY_CHANGE_INT)
766 dev_dbg(dev, "\tLocality Change Int Support\n");
767 if (intfcaps & TPM_INTF_STS_VALID_INT)
768 dev_dbg(dev, "\tSts Valid Int Support\n");
769 if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
770 dev_dbg(dev, "\tData Avail Int Support\n");
772 /* Very early on issue a command to the TPM in polling mode to make
773 * sure it works. May as well use that command to set the proper
774 * timeouts for the driver.
776 if (tpm_get_timeouts(chip)) {
777 dev_err(dev, "Could not get TPM timeouts and durations\n");
782 /* INTERRUPT Setup */
783 init_waitqueue_head(&chip->vendor.read_queue);
784 init_waitqueue_head(&chip->vendor.int_queue);
785 if (interrupts && tpm_info->irq != -1) {
787 tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED,
789 if (!chip->vendor.irq)
790 dev_err(chip->pdev, FW_BUG
791 "TPM interrupt not working, polling instead\n");
793 tpm_tis_probe_irq(chip, intmask);
796 if (chip->flags & TPM_CHIP_FLAG_TPM2) {
797 rc = tpm2_do_selftest(chip);
798 if (rc == TPM2_RC_INITIALIZE) {
799 dev_warn(dev, "Firmware has not started TPM\n");
800 rc = tpm2_startup(chip, TPM2_SU_CLEAR);
802 rc = tpm2_do_selftest(chip);
806 dev_err(dev, "TPM self test failed\n");
812 if (tpm_do_selftest(chip)) {
813 dev_err(dev, "TPM self test failed\n");
819 return tpm_chip_register(chip);
821 tpm_tis_remove(chip);
825 #ifdef CONFIG_PM_SLEEP
826 static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
830 /* reenable interrupts that device may have lost or
831 BIOS/firmware may have disabled */
832 iowrite8(chip->vendor.irq, chip->vendor.iobase +
833 TPM_INT_VECTOR(chip->vendor.locality));
836 ioread32(chip->vendor.iobase +
837 TPM_INT_ENABLE(chip->vendor.locality));
839 intmask |= TPM_INTF_CMD_READY_INT
840 | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
841 | TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE;
844 chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality));
847 static int tpm_tis_resume(struct device *dev)
849 struct tpm_chip *chip = dev_get_drvdata(dev);
852 if (chip->vendor.irq)
853 tpm_tis_reenable_interrupts(chip);
855 ret = tpm_pm_resume(dev);
859 /* TPM 1.2 requires self-test on resume. This function actually returns
860 * an error code but for unknown reason it isn't handled.
862 if (!(chip->flags & TPM_CHIP_FLAG_TPM2))
863 tpm_do_selftest(chip);
869 static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);
872 static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
873 const struct pnp_device_id *pnp_id)
875 struct tpm_info tpm_info = {};
876 acpi_handle acpi_dev_handle = NULL;
878 tpm_info.start = pnp_mem_start(pnp_dev, 0);
879 tpm_info.len = pnp_mem_len(pnp_dev, 0);
881 if (pnp_irq_valid(pnp_dev, 0))
882 tpm_info.irq = pnp_irq(pnp_dev, 0);
887 if (pnp_acpi_device(pnp_dev)) {
888 if (is_itpm(pnp_acpi_device(pnp_dev)))
891 acpi_dev_handle = pnp_acpi_device(pnp_dev)->handle;
895 return tpm_tis_init(&pnp_dev->dev, &tpm_info, acpi_dev_handle);
898 static struct pnp_device_id tpm_pnp_tbl[] = {
899 {"PNP0C31", 0}, /* TPM */
900 {"ATM1200", 0}, /* Atmel */
901 {"IFX0102", 0}, /* Infineon */
902 {"BCM0101", 0}, /* Broadcom */
903 {"BCM0102", 0}, /* Broadcom */
904 {"NSC1200", 0}, /* National */
905 {"ICO0102", 0}, /* Intel */
907 {"", 0}, /* User Specified */
908 {"", 0} /* Terminator */
910 MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);
912 static void tpm_tis_pnp_remove(struct pnp_dev *dev)
914 struct tpm_chip *chip = pnp_get_drvdata(dev);
916 tpm_chip_unregister(chip);
917 tpm_tis_remove(chip);
920 static struct pnp_driver tis_pnp_driver = {
922 .id_table = tpm_pnp_tbl,
923 .probe = tpm_tis_pnp_init,
924 .remove = tpm_tis_pnp_remove,
930 #define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
931 module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
932 sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
933 MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
937 static int tpm_check_resource(struct acpi_resource *ares, void *data)
939 struct tpm_info *tpm_info = (struct tpm_info *) data;
942 if (acpi_dev_resource_interrupt(ares, 0, &res)) {
943 tpm_info->irq = res.start;
944 } else if (acpi_dev_resource_memory(ares, &res)) {
945 tpm_info->start = res.start;
946 tpm_info->len = resource_size(&res);
952 static int tpm_tis_acpi_init(struct acpi_device *acpi_dev)
954 struct acpi_table_tpm2 *tbl;
956 struct list_head resources;
957 struct tpm_info tpm_info = {};
960 st = acpi_get_table(ACPI_SIG_TPM2, 1,
961 (struct acpi_table_header **) &tbl);
962 if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) {
963 dev_err(&acpi_dev->dev,
964 FW_BUG "failed to get TPM2 ACPI table\n");
968 if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
971 INIT_LIST_HEAD(&resources);
973 ret = acpi_dev_get_resources(acpi_dev, &resources, tpm_check_resource,
978 acpi_dev_free_resource_list(&resources);
980 if (tpm_info.start == 0 && tpm_info.len == 0) {
981 dev_err(&acpi_dev->dev,
982 FW_BUG "TPM2 ACPI table does not define a memory resource\n");
986 if (is_itpm(acpi_dev))
989 return tpm_tis_init(&acpi_dev->dev, &tpm_info, acpi_dev->handle);
992 static int tpm_tis_acpi_remove(struct acpi_device *dev)
994 struct tpm_chip *chip = dev_get_drvdata(&dev->dev);
996 tpm_chip_unregister(chip);
997 tpm_tis_remove(chip);
1002 static struct acpi_device_id tpm_acpi_tbl[] = {
1003 {"MSFT0101", 0}, /* TPM 2.0 */
1005 {"", 0}, /* User Specified */
1006 {"", 0} /* Terminator */
1008 MODULE_DEVICE_TABLE(acpi, tpm_acpi_tbl);
1010 static struct acpi_driver tis_acpi_driver = {
1012 .ids = tpm_acpi_tbl,
1014 .add = tpm_tis_acpi_init,
1015 .remove = tpm_tis_acpi_remove,
1023 static struct platform_driver tis_drv = {
1030 static struct platform_device *pdev;
1033 module_param(force, bool, 0444);
1034 MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
1035 static int __init init_tis(void)
1040 rc = pnp_register_driver(&tis_pnp_driver);
1047 rc = acpi_bus_register_driver(&tis_acpi_driver);
1050 pnp_unregister_driver(&tis_pnp_driver);
1059 rc = platform_driver_register(&tis_drv);
1062 pdev = platform_device_register_simple("tpm_tis", -1, NULL, 0);
1067 rc = tpm_tis_init(&pdev->dev, &tis_default_info, NULL);
1072 platform_device_unregister(pdev);
1074 platform_driver_unregister(&tis_drv);
1078 static void __exit cleanup_tis(void)
1080 struct tpm_chip *chip;
1081 #if defined(CONFIG_PNP) || defined(CONFIG_ACPI)
1084 acpi_bus_unregister_driver(&tis_acpi_driver);
1087 pnp_unregister_driver(&tis_pnp_driver);
1092 chip = dev_get_drvdata(&pdev->dev);
1093 tpm_chip_unregister(chip);
1094 tpm_tis_remove(chip);
1095 platform_device_unregister(pdev);
1096 platform_driver_unregister(&tis_drv);
1099 module_init(init_tis);
1100 module_exit(cleanup_tis);
1101 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1102 MODULE_DESCRIPTION("TPM Driver");
1103 MODULE_VERSION("2.0");
1104 MODULE_LICENSE("GPL");