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Merge tag 'amd-drm-next-6.5-2023-06-09' of https://gitlab.freedesktop.org/agd5f/linux...
[J-linux.git] / drivers / char / tpm / tpm_crb.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2014 Intel Corporation
4  *
5  * Authors:
6  * Jarkko Sakkinen <[email protected]>
7  *
8  * Maintained by: <[email protected]>
9  *
10  * This device driver implements the TPM interface as defined in
11  * the TCG CRB 2.0 TPM specification.
12  */
13
14 #include <linux/acpi.h>
15 #include <linux/highmem.h>
16 #include <linux/rculist.h>
17 #include <linux/module.h>
18 #include <linux/pm_runtime.h>
19 #ifdef CONFIG_ARM64
20 #include <linux/arm-smccc.h>
21 #endif
22 #include "tpm.h"
23
24 #define ACPI_SIG_TPM2 "TPM2"
25 #define TPM_CRB_MAX_RESOURCES 3
26
27 static const guid_t crb_acpi_start_guid =
28         GUID_INIT(0x6BBF6CAB, 0x5463, 0x4714,
29                   0xB7, 0xCD, 0xF0, 0x20, 0x3C, 0x03, 0x68, 0xD4);
30
31 enum crb_defaults {
32         CRB_ACPI_START_REVISION_ID = 1,
33         CRB_ACPI_START_INDEX = 1,
34 };
35
36 enum crb_loc_ctrl {
37         CRB_LOC_CTRL_REQUEST_ACCESS     = BIT(0),
38         CRB_LOC_CTRL_RELINQUISH         = BIT(1),
39 };
40
41 enum crb_loc_state {
42         CRB_LOC_STATE_LOC_ASSIGNED      = BIT(1),
43         CRB_LOC_STATE_TPM_REG_VALID_STS = BIT(7),
44 };
45
46 enum crb_ctrl_req {
47         CRB_CTRL_REQ_CMD_READY  = BIT(0),
48         CRB_CTRL_REQ_GO_IDLE    = BIT(1),
49 };
50
51 enum crb_ctrl_sts {
52         CRB_CTRL_STS_ERROR      = BIT(0),
53         CRB_CTRL_STS_TPM_IDLE   = BIT(1),
54 };
55
56 enum crb_start {
57         CRB_START_INVOKE        = BIT(0),
58 };
59
60 enum crb_cancel {
61         CRB_CANCEL_INVOKE       = BIT(0),
62 };
63
64 struct crb_regs_head {
65         u32 loc_state;
66         u32 reserved1;
67         u32 loc_ctrl;
68         u32 loc_sts;
69         u8 reserved2[32];
70         u64 intf_id;
71         u64 ctrl_ext;
72 } __packed;
73
74 struct crb_regs_tail {
75         u32 ctrl_req;
76         u32 ctrl_sts;
77         u32 ctrl_cancel;
78         u32 ctrl_start;
79         u32 ctrl_int_enable;
80         u32 ctrl_int_sts;
81         u32 ctrl_cmd_size;
82         u32 ctrl_cmd_pa_low;
83         u32 ctrl_cmd_pa_high;
84         u32 ctrl_rsp_size;
85         u64 ctrl_rsp_pa;
86 } __packed;
87
88 enum crb_status {
89         CRB_DRV_STS_COMPLETE    = BIT(0),
90 };
91
92 struct crb_priv {
93         u32 sm;
94         const char *hid;
95         struct crb_regs_head __iomem *regs_h;
96         struct crb_regs_tail __iomem *regs_t;
97         u8 __iomem *cmd;
98         u8 __iomem *rsp;
99         u32 cmd_size;
100         u32 smc_func_id;
101         u32 __iomem *pluton_start_addr;
102         u32 __iomem *pluton_reply_addr;
103 };
104
105 struct tpm2_crb_smc {
106         u32 interrupt;
107         u8 interrupt_flags;
108         u8 op_flags;
109         u16 reserved2;
110         u32 smc_func_id;
111 };
112
113 struct tpm2_crb_pluton {
114         u64 start_addr;
115         u64 reply_addr;
116 };
117
118 static bool crb_wait_for_reg_32(u32 __iomem *reg, u32 mask, u32 value,
119                                 unsigned long timeout)
120 {
121         ktime_t start;
122         ktime_t stop;
123
124         start = ktime_get();
125         stop = ktime_add(start, ms_to_ktime(timeout));
126
127         do {
128                 if ((ioread32(reg) & mask) == value)
129                         return true;
130
131                 usleep_range(50, 100);
132         } while (ktime_before(ktime_get(), stop));
133
134         return ((ioread32(reg) & mask) == value);
135 }
136
137 static int crb_try_pluton_doorbell(struct crb_priv *priv, bool wait_for_complete)
138 {
139         if (priv->sm != ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON)
140                 return 0;
141
142         if (!crb_wait_for_reg_32(priv->pluton_reply_addr, ~0, 1, TPM2_TIMEOUT_C))
143                 return -ETIME;
144
145         iowrite32(1, priv->pluton_start_addr);
146         if (wait_for_complete == false)
147                 return 0;
148
149         if (!crb_wait_for_reg_32(priv->pluton_start_addr,
150                                  0xffffffff, 0, 200))
151                 return -ETIME;
152
153         return 0;
154 }
155
156 /**
157  * __crb_go_idle - request tpm crb device to go the idle state
158  *
159  * @dev:  crb device
160  * @priv: crb private data
161  *
162  * Write CRB_CTRL_REQ_GO_IDLE to TPM_CRB_CTRL_REQ
163  * The device should respond within TIMEOUT_C by clearing the bit.
164  * Anyhow, we do not wait here as a consequent CMD_READY request
165  * will be handled correctly even if idle was not completed.
166  *
167  * The function does nothing for devices with ACPI-start method
168  * or SMC-start method.
169  *
170  * Return: 0 always
171  */
172 static int __crb_go_idle(struct device *dev, struct crb_priv *priv)
173 {
174         int rc;
175
176         if ((priv->sm == ACPI_TPM2_START_METHOD) ||
177             (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) ||
178             (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC))
179                 return 0;
180
181         iowrite32(CRB_CTRL_REQ_GO_IDLE, &priv->regs_t->ctrl_req);
182
183         rc = crb_try_pluton_doorbell(priv, true);
184         if (rc)
185                 return rc;
186
187         if (!crb_wait_for_reg_32(&priv->regs_t->ctrl_req,
188                                  CRB_CTRL_REQ_GO_IDLE/* mask */,
189                                  0, /* value */
190                                  TPM2_TIMEOUT_C)) {
191                 dev_warn(dev, "goIdle timed out\n");
192                 return -ETIME;
193         }
194
195         return 0;
196 }
197
198 static int crb_go_idle(struct tpm_chip *chip)
199 {
200         struct device *dev = &chip->dev;
201         struct crb_priv *priv = dev_get_drvdata(dev);
202
203         return __crb_go_idle(dev, priv);
204 }
205
206 /**
207  * __crb_cmd_ready - request tpm crb device to enter ready state
208  *
209  * @dev:  crb device
210  * @priv: crb private data
211  *
212  * Write CRB_CTRL_REQ_CMD_READY to TPM_CRB_CTRL_REQ
213  * and poll till the device acknowledge it by clearing the bit.
214  * The device should respond within TIMEOUT_C.
215  *
216  * The function does nothing for devices with ACPI-start method
217  * or SMC-start method.
218  *
219  * Return: 0 on success -ETIME on timeout;
220  */
221 static int __crb_cmd_ready(struct device *dev, struct crb_priv *priv)
222 {
223         int rc;
224
225         if ((priv->sm == ACPI_TPM2_START_METHOD) ||
226             (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) ||
227             (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC))
228                 return 0;
229
230         iowrite32(CRB_CTRL_REQ_CMD_READY, &priv->regs_t->ctrl_req);
231
232         rc = crb_try_pluton_doorbell(priv, true);
233         if (rc)
234                 return rc;
235
236         if (!crb_wait_for_reg_32(&priv->regs_t->ctrl_req,
237                                  CRB_CTRL_REQ_CMD_READY /* mask */,
238                                  0, /* value */
239                                  TPM2_TIMEOUT_C)) {
240                 dev_warn(dev, "cmdReady timed out\n");
241                 return -ETIME;
242         }
243
244         return 0;
245 }
246
247 static int crb_cmd_ready(struct tpm_chip *chip)
248 {
249         struct device *dev = &chip->dev;
250         struct crb_priv *priv = dev_get_drvdata(dev);
251
252         return __crb_cmd_ready(dev, priv);
253 }
254
255 static int __crb_request_locality(struct device *dev,
256                                   struct crb_priv *priv, int loc)
257 {
258         u32 value = CRB_LOC_STATE_LOC_ASSIGNED |
259                     CRB_LOC_STATE_TPM_REG_VALID_STS;
260
261         if (!priv->regs_h)
262                 return 0;
263
264         iowrite32(CRB_LOC_CTRL_REQUEST_ACCESS, &priv->regs_h->loc_ctrl);
265         if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, value, value,
266                                  TPM2_TIMEOUT_C)) {
267                 dev_warn(dev, "TPM_LOC_STATE_x.requestAccess timed out\n");
268                 return -ETIME;
269         }
270
271         return 0;
272 }
273
274 static int crb_request_locality(struct tpm_chip *chip, int loc)
275 {
276         struct crb_priv *priv = dev_get_drvdata(&chip->dev);
277
278         return __crb_request_locality(&chip->dev, priv, loc);
279 }
280
281 static int __crb_relinquish_locality(struct device *dev,
282                                      struct crb_priv *priv, int loc)
283 {
284         u32 mask = CRB_LOC_STATE_LOC_ASSIGNED |
285                    CRB_LOC_STATE_TPM_REG_VALID_STS;
286         u32 value = CRB_LOC_STATE_TPM_REG_VALID_STS;
287
288         if (!priv->regs_h)
289                 return 0;
290
291         iowrite32(CRB_LOC_CTRL_RELINQUISH, &priv->regs_h->loc_ctrl);
292         if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, mask, value,
293                                  TPM2_TIMEOUT_C)) {
294                 dev_warn(dev, "TPM_LOC_STATE_x.Relinquish timed out\n");
295                 return -ETIME;
296         }
297
298         return 0;
299 }
300
301 static int crb_relinquish_locality(struct tpm_chip *chip, int loc)
302 {
303         struct crb_priv *priv = dev_get_drvdata(&chip->dev);
304
305         return __crb_relinquish_locality(&chip->dev, priv, loc);
306 }
307
308 static u8 crb_status(struct tpm_chip *chip)
309 {
310         struct crb_priv *priv = dev_get_drvdata(&chip->dev);
311         u8 sts = 0;
312
313         if ((ioread32(&priv->regs_t->ctrl_start) & CRB_START_INVOKE) !=
314             CRB_START_INVOKE)
315                 sts |= CRB_DRV_STS_COMPLETE;
316
317         return sts;
318 }
319
320 static int crb_recv(struct tpm_chip *chip, u8 *buf, size_t count)
321 {
322         struct crb_priv *priv = dev_get_drvdata(&chip->dev);
323         unsigned int expected;
324
325         /* A sanity check that the upper layer wants to get at least the header
326          * as that is the minimum size for any TPM response.
327          */
328         if (count < TPM_HEADER_SIZE)
329                 return -EIO;
330
331         /* If this bit is set, according to the spec, the TPM is in
332          * unrecoverable condition.
333          */
334         if (ioread32(&priv->regs_t->ctrl_sts) & CRB_CTRL_STS_ERROR)
335                 return -EIO;
336
337         /* Read the first 8 bytes in order to get the length of the response.
338          * We read exactly a quad word in order to make sure that the remaining
339          * reads will be aligned.
340          */
341         memcpy_fromio(buf, priv->rsp, 8);
342
343         expected = be32_to_cpup((__be32 *)&buf[2]);
344         if (expected > count || expected < TPM_HEADER_SIZE)
345                 return -EIO;
346
347         memcpy_fromio(&buf[8], &priv->rsp[8], expected - 8);
348
349         return expected;
350 }
351
352 static int crb_do_acpi_start(struct tpm_chip *chip)
353 {
354         union acpi_object *obj;
355         int rc;
356
357         obj = acpi_evaluate_dsm(chip->acpi_dev_handle,
358                                 &crb_acpi_start_guid,
359                                 CRB_ACPI_START_REVISION_ID,
360                                 CRB_ACPI_START_INDEX,
361                                 NULL);
362         if (!obj)
363                 return -ENXIO;
364         rc = obj->integer.value == 0 ? 0 : -ENXIO;
365         ACPI_FREE(obj);
366         return rc;
367 }
368
369 #ifdef CONFIG_ARM64
370 /*
371  * This is a TPM Command Response Buffer start method that invokes a
372  * Secure Monitor Call to requrest the firmware to execute or cancel
373  * a TPM 2.0 command.
374  */
375 static int tpm_crb_smc_start(struct device *dev, unsigned long func_id)
376 {
377         struct arm_smccc_res res;
378
379         arm_smccc_smc(func_id, 0, 0, 0, 0, 0, 0, 0, &res);
380         if (res.a0 != 0) {
381                 dev_err(dev,
382                         FW_BUG "tpm_crb_smc_start() returns res.a0 = 0x%lx\n",
383                         res.a0);
384                 return -EIO;
385         }
386
387         return 0;
388 }
389 #else
390 static int tpm_crb_smc_start(struct device *dev, unsigned long func_id)
391 {
392         dev_err(dev, FW_BUG "tpm_crb: incorrect start method\n");
393         return -EINVAL;
394 }
395 #endif
396
397 static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len)
398 {
399         struct crb_priv *priv = dev_get_drvdata(&chip->dev);
400         int rc = 0;
401
402         /* Zero the cancel register so that the next command will not get
403          * canceled.
404          */
405         iowrite32(0, &priv->regs_t->ctrl_cancel);
406
407         if (len > priv->cmd_size) {
408                 dev_err(&chip->dev, "invalid command count value %zd %d\n",
409                         len, priv->cmd_size);
410                 return -E2BIG;
411         }
412
413         /* Seems to be necessary for every command */
414         if (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON)
415                 __crb_cmd_ready(&chip->dev, priv);
416
417         memcpy_toio(priv->cmd, buf, len);
418
419         /* Make sure that cmd is populated before issuing start. */
420         wmb();
421
422         /* The reason for the extra quirk is that the PTT in 4th Gen Core CPUs
423          * report only ACPI start but in practice seems to require both
424          * CRB start, hence invoking CRB start method if hid == MSFT0101.
425          */
426         if ((priv->sm == ACPI_TPM2_COMMAND_BUFFER) ||
427             (priv->sm == ACPI_TPM2_MEMORY_MAPPED) ||
428             (!strcmp(priv->hid, "MSFT0101")))
429                 iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start);
430
431         if ((priv->sm == ACPI_TPM2_START_METHOD) ||
432             (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD))
433                 rc = crb_do_acpi_start(chip);
434
435         if (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) {
436                 iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start);
437                 rc = tpm_crb_smc_start(&chip->dev, priv->smc_func_id);
438         }
439
440         if (rc)
441                 return rc;
442
443         return crb_try_pluton_doorbell(priv, false);
444 }
445
446 static void crb_cancel(struct tpm_chip *chip)
447 {
448         struct crb_priv *priv = dev_get_drvdata(&chip->dev);
449
450         iowrite32(CRB_CANCEL_INVOKE, &priv->regs_t->ctrl_cancel);
451
452         if (((priv->sm == ACPI_TPM2_START_METHOD) ||
453             (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD)) &&
454              crb_do_acpi_start(chip))
455                 dev_err(&chip->dev, "ACPI Start failed\n");
456 }
457
458 static bool crb_req_canceled(struct tpm_chip *chip, u8 status)
459 {
460         struct crb_priv *priv = dev_get_drvdata(&chip->dev);
461         u32 cancel = ioread32(&priv->regs_t->ctrl_cancel);
462
463         return (cancel & CRB_CANCEL_INVOKE) == CRB_CANCEL_INVOKE;
464 }
465
466 static const struct tpm_class_ops tpm_crb = {
467         .flags = TPM_OPS_AUTO_STARTUP,
468         .status = crb_status,
469         .recv = crb_recv,
470         .send = crb_send,
471         .cancel = crb_cancel,
472         .req_canceled = crb_req_canceled,
473         .go_idle  = crb_go_idle,
474         .cmd_ready = crb_cmd_ready,
475         .request_locality = crb_request_locality,
476         .relinquish_locality = crb_relinquish_locality,
477         .req_complete_mask = CRB_DRV_STS_COMPLETE,
478         .req_complete_val = CRB_DRV_STS_COMPLETE,
479 };
480
481 static int crb_check_resource(struct acpi_resource *ares, void *data)
482 {
483         struct resource *iores_array = data;
484         struct resource_win win;
485         struct resource *res = &(win.res);
486         int i;
487
488         if (acpi_dev_resource_memory(ares, res) ||
489             acpi_dev_resource_address_space(ares, &win)) {
490                 for (i = 0; i < TPM_CRB_MAX_RESOURCES + 1; ++i) {
491                         if (resource_type(iores_array + i) != IORESOURCE_MEM) {
492                                 iores_array[i] = *res;
493                                 iores_array[i].name = NULL;
494                                 break;
495                         }
496                 }
497         }
498
499         return 1;
500 }
501
502 static void __iomem *crb_map_res(struct device *dev, struct resource *iores,
503                                  void __iomem **iobase_ptr, u64 start, u32 size)
504 {
505         struct resource new_res = {
506                 .start  = start,
507                 .end    = start + size - 1,
508                 .flags  = IORESOURCE_MEM,
509         };
510
511         /* Detect a 64 bit address on a 32 bit system */
512         if (start != new_res.start)
513                 return IOMEM_ERR_PTR(-EINVAL);
514
515         if (!iores)
516                 return devm_ioremap_resource(dev, &new_res);
517
518         if (!*iobase_ptr) {
519                 *iobase_ptr = devm_ioremap_resource(dev, iores);
520                 if (IS_ERR(*iobase_ptr))
521                         return *iobase_ptr;
522         }
523
524         return *iobase_ptr + (new_res.start - iores->start);
525 }
526
527 /*
528  * Work around broken BIOSs that return inconsistent values from the ACPI
529  * region vs the registers. Trust the ACPI region. Such broken systems
530  * probably cannot send large TPM commands since the buffer will be truncated.
531  */
532 static u64 crb_fixup_cmd_size(struct device *dev, struct resource *io_res,
533                               u64 start, u64 size)
534 {
535         if (io_res->start > start || io_res->end < start)
536                 return size;
537
538         if (start + size - 1 <= io_res->end)
539                 return size;
540
541         dev_err(dev,
542                 FW_BUG "ACPI region does not cover the entire command/response buffer. %pr vs %llx %llx\n",
543                 io_res, start, size);
544
545         return io_res->end - start + 1;
546 }
547
548 static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
549                       struct acpi_table_tpm2 *buf)
550 {
551         struct list_head acpi_resource_list;
552         struct resource iores_array[TPM_CRB_MAX_RESOURCES + 1] = { {0} };
553         void __iomem *iobase_array[TPM_CRB_MAX_RESOURCES] = {NULL};
554         struct device *dev = &device->dev;
555         struct resource *iores;
556         void __iomem **iobase_ptr;
557         int i;
558         u32 pa_high, pa_low;
559         u64 cmd_pa;
560         u32 cmd_size;
561         __le64 __rsp_pa;
562         u64 rsp_pa;
563         u32 rsp_size;
564         int ret;
565
566         INIT_LIST_HEAD(&acpi_resource_list);
567         ret = acpi_dev_get_resources(device, &acpi_resource_list,
568                                      crb_check_resource, iores_array);
569         if (ret < 0)
570                 return ret;
571         acpi_dev_free_resource_list(&acpi_resource_list);
572
573         /* Pluton doesn't appear to define ACPI memory regions */
574         if (priv->sm != ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON) {
575                 if (resource_type(iores_array) != IORESOURCE_MEM) {
576                         dev_err(dev, FW_BUG "TPM2 ACPI table does not define a memory resource\n");
577                         return -EINVAL;
578                 } else if (resource_type(iores_array + TPM_CRB_MAX_RESOURCES) ==
579                            IORESOURCE_MEM) {
580                         dev_warn(dev, "TPM2 ACPI table defines too many memory resources\n");
581                         memset(iores_array + TPM_CRB_MAX_RESOURCES,
582                                0, sizeof(*iores_array));
583                         iores_array[TPM_CRB_MAX_RESOURCES].flags = 0;
584                 }
585         }
586
587         iores = NULL;
588         iobase_ptr = NULL;
589         for (i = 0; resource_type(iores_array + i) == IORESOURCE_MEM; ++i) {
590                 if (buf->control_address >= iores_array[i].start &&
591                     buf->control_address + sizeof(struct crb_regs_tail) - 1 <=
592                     iores_array[i].end) {
593                         iores = iores_array + i;
594                         iobase_ptr = iobase_array + i;
595                         break;
596                 }
597         }
598
599         priv->regs_t = crb_map_res(dev, iores, iobase_ptr, buf->control_address,
600                                    sizeof(struct crb_regs_tail));
601
602         if (IS_ERR(priv->regs_t))
603                 return PTR_ERR(priv->regs_t);
604
605         /* The ACPI IO region starts at the head area and continues to include
606          * the control area, as one nice sane region except for some older
607          * stuff that puts the control area outside the ACPI IO region.
608          */
609         if ((priv->sm == ACPI_TPM2_COMMAND_BUFFER) ||
610             (priv->sm == ACPI_TPM2_MEMORY_MAPPED)) {
611                 if (iores &&
612                     buf->control_address == iores->start +
613                     sizeof(*priv->regs_h))
614                         priv->regs_h = *iobase_ptr;
615                 else
616                         dev_warn(dev, FW_BUG "Bad ACPI memory layout");
617         }
618
619         ret = __crb_request_locality(dev, priv, 0);
620         if (ret)
621                 return ret;
622
623         /*
624          * PTT HW bug w/a: wake up the device to access
625          * possibly not retained registers.
626          */
627         ret = __crb_cmd_ready(dev, priv);
628         if (ret)
629                 goto out_relinquish_locality;
630
631         pa_high = ioread32(&priv->regs_t->ctrl_cmd_pa_high);
632         pa_low  = ioread32(&priv->regs_t->ctrl_cmd_pa_low);
633         cmd_pa = ((u64)pa_high << 32) | pa_low;
634         cmd_size = ioread32(&priv->regs_t->ctrl_cmd_size);
635
636         iores = NULL;
637         iobase_ptr = NULL;
638         for (i = 0; iores_array[i].end; ++i) {
639                 if (cmd_pa >= iores_array[i].start &&
640                     cmd_pa <= iores_array[i].end) {
641                         iores = iores_array + i;
642                         iobase_ptr = iobase_array + i;
643                         break;
644                 }
645         }
646
647         if (iores)
648                 cmd_size = crb_fixup_cmd_size(dev, iores, cmd_pa, cmd_size);
649
650         dev_dbg(dev, "cmd_hi = %X cmd_low = %X cmd_size %X\n",
651                 pa_high, pa_low, cmd_size);
652
653         priv->cmd = crb_map_res(dev, iores, iobase_ptr, cmd_pa, cmd_size);
654         if (IS_ERR(priv->cmd)) {
655                 ret = PTR_ERR(priv->cmd);
656                 goto out;
657         }
658
659         memcpy_fromio(&__rsp_pa, &priv->regs_t->ctrl_rsp_pa, 8);
660         rsp_pa = le64_to_cpu(__rsp_pa);
661         rsp_size = ioread32(&priv->regs_t->ctrl_rsp_size);
662
663         iores = NULL;
664         iobase_ptr = NULL;
665         for (i = 0; resource_type(iores_array + i) == IORESOURCE_MEM; ++i) {
666                 if (rsp_pa >= iores_array[i].start &&
667                     rsp_pa <= iores_array[i].end) {
668                         iores = iores_array + i;
669                         iobase_ptr = iobase_array + i;
670                         break;
671                 }
672         }
673
674         if (iores)
675                 rsp_size = crb_fixup_cmd_size(dev, iores, rsp_pa, rsp_size);
676
677         if (cmd_pa != rsp_pa) {
678                 priv->rsp = crb_map_res(dev, iores, iobase_ptr,
679                                         rsp_pa, rsp_size);
680                 ret = PTR_ERR_OR_ZERO(priv->rsp);
681                 goto out;
682         }
683
684         /* According to the PTP specification, overlapping command and response
685          * buffer sizes must be identical.
686          */
687         if (cmd_size != rsp_size) {
688                 dev_err(dev, FW_BUG "overlapping command and response buffer sizes are not identical");
689                 ret = -EINVAL;
690                 goto out;
691         }
692
693         priv->rsp = priv->cmd;
694
695 out:
696         if (!ret)
697                 priv->cmd_size = cmd_size;
698
699         __crb_go_idle(dev, priv);
700
701 out_relinquish_locality:
702
703         __crb_relinquish_locality(dev, priv, 0);
704
705         return ret;
706 }
707
708 static int crb_map_pluton(struct device *dev, struct crb_priv *priv,
709                struct acpi_table_tpm2 *buf, struct tpm2_crb_pluton *crb_pluton)
710 {
711         priv->pluton_start_addr = crb_map_res(dev, NULL, NULL,
712                                               crb_pluton->start_addr, 4);
713         if (IS_ERR(priv->pluton_start_addr))
714                 return PTR_ERR(priv->pluton_start_addr);
715
716         priv->pluton_reply_addr = crb_map_res(dev, NULL, NULL,
717                                               crb_pluton->reply_addr, 4);
718         if (IS_ERR(priv->pluton_reply_addr))
719                 return PTR_ERR(priv->pluton_reply_addr);
720
721         return 0;
722 }
723
724 static int crb_acpi_add(struct acpi_device *device)
725 {
726         struct acpi_table_tpm2 *buf;
727         struct crb_priv *priv;
728         struct tpm_chip *chip;
729         struct device *dev = &device->dev;
730         struct tpm2_crb_smc *crb_smc;
731         struct tpm2_crb_pluton *crb_pluton;
732         acpi_status status;
733         u32 sm;
734         int rc;
735
736         status = acpi_get_table(ACPI_SIG_TPM2, 1,
737                                 (struct acpi_table_header **) &buf);
738         if (ACPI_FAILURE(status) || buf->header.length < sizeof(*buf)) {
739                 dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n");
740                 return -EINVAL;
741         }
742
743         /* Should the FIFO driver handle this? */
744         sm = buf->start_method;
745         if (sm == ACPI_TPM2_MEMORY_MAPPED) {
746                 rc = -ENODEV;
747                 goto out;
748         }
749
750         priv = devm_kzalloc(dev, sizeof(struct crb_priv), GFP_KERNEL);
751         if (!priv) {
752                 rc = -ENOMEM;
753                 goto out;
754         }
755
756         if (sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) {
757                 if (buf->header.length < (sizeof(*buf) + sizeof(*crb_smc))) {
758                         dev_err(dev,
759                                 FW_BUG "TPM2 ACPI table has wrong size %u for start method type %d\n",
760                                 buf->header.length,
761                                 ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC);
762                         rc = -EINVAL;
763                         goto out;
764                 }
765                 crb_smc = ACPI_ADD_PTR(struct tpm2_crb_smc, buf, sizeof(*buf));
766                 priv->smc_func_id = crb_smc->smc_func_id;
767         }
768
769         if (sm == ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON) {
770                 if (buf->header.length < (sizeof(*buf) + sizeof(*crb_pluton))) {
771                         dev_err(dev,
772                                 FW_BUG "TPM2 ACPI table has wrong size %u for start method type %d\n",
773                                 buf->header.length,
774                                 ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON);
775                         return -EINVAL;
776                 }
777                 crb_pluton = ACPI_ADD_PTR(struct tpm2_crb_pluton, buf, sizeof(*buf));
778                 rc = crb_map_pluton(dev, priv, buf, crb_pluton);
779                 if (rc)
780                         return rc;
781         }
782
783         priv->sm = sm;
784         priv->hid = acpi_device_hid(device);
785
786         rc = crb_map_io(device, priv, buf);
787         if (rc)
788                 goto out;
789
790         chip = tpmm_chip_alloc(dev, &tpm_crb);
791         if (IS_ERR(chip)) {
792                 rc = PTR_ERR(chip);
793                 goto out;
794         }
795
796         dev_set_drvdata(&chip->dev, priv);
797         chip->acpi_dev_handle = device->handle;
798         chip->flags = TPM_CHIP_FLAG_TPM2;
799
800         rc = tpm_chip_register(chip);
801
802 out:
803         acpi_put_table((struct acpi_table_header *)buf);
804         return rc;
805 }
806
807 static void crb_acpi_remove(struct acpi_device *device)
808 {
809         struct device *dev = &device->dev;
810         struct tpm_chip *chip = dev_get_drvdata(dev);
811
812         tpm_chip_unregister(chip);
813 }
814
815 static const struct dev_pm_ops crb_pm = {
816         SET_SYSTEM_SLEEP_PM_OPS(tpm_pm_suspend, tpm_pm_resume)
817 };
818
819 static const struct acpi_device_id crb_device_ids[] = {
820         {"MSFT0101", 0},
821         {"", 0},
822 };
823 MODULE_DEVICE_TABLE(acpi, crb_device_ids);
824
825 static struct acpi_driver crb_acpi_driver = {
826         .name = "tpm_crb",
827         .ids = crb_device_ids,
828         .ops = {
829                 .add = crb_acpi_add,
830                 .remove = crb_acpi_remove,
831         },
832         .drv = {
833                 .pm = &crb_pm,
834         },
835 };
836
837 module_acpi_driver(crb_acpi_driver);
838 MODULE_AUTHOR("Jarkko Sakkinen <[email protected]>");
839 MODULE_DESCRIPTION("TPM2 Driver");
840 MODULE_VERSION("0.1");
841 MODULE_LICENSE("GPL");
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