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1/*
2 * Copyright © 2013 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 */
24
25#include <asm/iosf_mbi.h>
26
27#include "i915_drv.h"
28#include "intel_sideband.h"
29
30/*
31 * IOSF sideband, see VLV2_SidebandMsg_HAS.docx and
32 * VLV_VLV2_PUNIT_HAS_0.8.docx
33 */
34
35/* Standard MMIO read, non-posted */
36#define SB_MRD_NP 0x00
37/* Standard MMIO write, non-posted */
38#define SB_MWR_NP 0x01
39/* Private register read, double-word addressing, non-posted */
40#define SB_CRRDDA_NP 0x06
41/* Private register write, double-word addressing, non-posted */
42#define SB_CRWRDA_NP 0x07
43
44static void ping(void *info)
45{
46}
47
48static void __vlv_punit_get(struct drm_i915_private *i915)
49{
50 iosf_mbi_punit_acquire();
51
52 /*
53 * Prevent the cpu from sleeping while we use this sideband, otherwise
54 * the punit may cause a machine hang. The issue appears to be isolated
55 * with changing the power state of the CPU package while changing
56 * the power state via the punit, and we have only observed it
57 * reliably on 4-core Baytail systems suggesting the issue is in the
58 * power delivery mechanism and likely to be be board/function
59 * specific. Hence we presume the workaround needs only be applied
60 * to the Valleyview P-unit and not all sideband communications.
61 */
62 if (IS_VALLEYVIEW(i915)) {
63 cpu_latency_qos_update_request(&i915->sb_qos, 0);
64 on_each_cpu(ping, NULL, 1);
65 }
66}
67
68static void __vlv_punit_put(struct drm_i915_private *i915)
69{
70 if (IS_VALLEYVIEW(i915))
71 cpu_latency_qos_update_request(&i915->sb_qos,
72 PM_QOS_DEFAULT_VALUE);
73
74 iosf_mbi_punit_release();
75}
76
77void vlv_iosf_sb_get(struct drm_i915_private *i915, unsigned long ports)
78{
79 if (ports & BIT(VLV_IOSF_SB_PUNIT))
80 __vlv_punit_get(i915);
81
82 mutex_lock(&i915->sb_lock);
83}
84
85void vlv_iosf_sb_put(struct drm_i915_private *i915, unsigned long ports)
86{
87 mutex_unlock(&i915->sb_lock);
88
89 if (ports & BIT(VLV_IOSF_SB_PUNIT))
90 __vlv_punit_put(i915);
91}
92
93static int vlv_sideband_rw(struct drm_i915_private *i915,
94 u32 devfn, u32 port, u32 opcode,
95 u32 addr, u32 *val)
96{
97 struct intel_uncore *uncore = &i915->uncore;
98 const bool is_read = (opcode == SB_MRD_NP || opcode == SB_CRRDDA_NP);
99 int err;
100
101 lockdep_assert_held(&i915->sb_lock);
102 if (port == IOSF_PORT_PUNIT)
103 iosf_mbi_assert_punit_acquired();
104
105 /* Flush the previous comms, just in case it failed last time. */
106 if (intel_wait_for_register(uncore,
107 VLV_IOSF_DOORBELL_REQ, IOSF_SB_BUSY, 0,
108 5)) {
109 drm_dbg(&i915->drm, "IOSF sideband idle wait (%s) timed out\n",
110 is_read ? "read" : "write");
111 return -EAGAIN;
112 }
113
114 preempt_disable();
115
116 intel_uncore_write_fw(uncore, VLV_IOSF_ADDR, addr);
117 intel_uncore_write_fw(uncore, VLV_IOSF_DATA, is_read ? 0 : *val);
118 intel_uncore_write_fw(uncore, VLV_IOSF_DOORBELL_REQ,
119 (devfn << IOSF_DEVFN_SHIFT) |
120 (opcode << IOSF_OPCODE_SHIFT) |
121 (port << IOSF_PORT_SHIFT) |
122 (0xf << IOSF_BYTE_ENABLES_SHIFT) |
123 (0 << IOSF_BAR_SHIFT) |
124 IOSF_SB_BUSY);
125
126 if (__intel_wait_for_register_fw(uncore,
127 VLV_IOSF_DOORBELL_REQ, IOSF_SB_BUSY, 0,
128 10000, 0, NULL) == 0) {
129 if (is_read)
130 *val = intel_uncore_read_fw(uncore, VLV_IOSF_DATA);
131 err = 0;
132 } else {
133 drm_dbg(&i915->drm, "IOSF sideband finish wait (%s) timed out\n",
134 is_read ? "read" : "write");
135 err = -ETIMEDOUT;
136 }
137
138 preempt_enable();
139
140 return err;
141}
142
143u32 vlv_punit_read(struct drm_i915_private *i915, u32 addr)
144{
145 u32 val = 0;
146
147 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_PUNIT,
148 SB_CRRDDA_NP, addr, &val);
149
150 return val;
151}
152
153int vlv_punit_write(struct drm_i915_private *i915, u32 addr, u32 val)
154{
155 return vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_PUNIT,
156 SB_CRWRDA_NP, addr, &val);
157}
158
159u32 vlv_bunit_read(struct drm_i915_private *i915, u32 reg)
160{
161 u32 val = 0;
162
163 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_BUNIT,
164 SB_CRRDDA_NP, reg, &val);
165
166 return val;
167}
168
169void vlv_bunit_write(struct drm_i915_private *i915, u32 reg, u32 val)
170{
171 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_BUNIT,
172 SB_CRWRDA_NP, reg, &val);
173}
174
175u32 vlv_nc_read(struct drm_i915_private *i915, u8 addr)
176{
177 u32 val = 0;
178
179 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_NC,
180 SB_CRRDDA_NP, addr, &val);
181
182 return val;
183}
184
185u32 vlv_iosf_sb_read(struct drm_i915_private *i915, u8 port, u32 reg)
186{
187 u32 val = 0;
188
189 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), port,
190 SB_CRRDDA_NP, reg, &val);
191
192 return val;
193}
194
195void vlv_iosf_sb_write(struct drm_i915_private *i915,
196 u8 port, u32 reg, u32 val)
197{
198 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), port,
199 SB_CRWRDA_NP, reg, &val);
200}
201
202u32 vlv_cck_read(struct drm_i915_private *i915, u32 reg)
203{
204 u32 val = 0;
205
206 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_CCK,
207 SB_CRRDDA_NP, reg, &val);
208
209 return val;
210}
211
212void vlv_cck_write(struct drm_i915_private *i915, u32 reg, u32 val)
213{
214 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_CCK,
215 SB_CRWRDA_NP, reg, &val);
216}
217
218u32 vlv_ccu_read(struct drm_i915_private *i915, u32 reg)
219{
220 u32 val = 0;
221
222 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_CCU,
223 SB_CRRDDA_NP, reg, &val);
224
225 return val;
226}
227
228void vlv_ccu_write(struct drm_i915_private *i915, u32 reg, u32 val)
229{
230 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_CCU,
231 SB_CRWRDA_NP, reg, &val);
232}
233
234static u32 vlv_dpio_phy_iosf_port(struct drm_i915_private *i915, enum dpio_phy phy)
235{
236 /*
237 * IOSF_PORT_DPIO: VLV x2 PHY (DP/HDMI B and C), CHV x1 PHY (DP/HDMI D)
238 * IOSF_PORT_DPIO_2: CHV x2 PHY (DP/HDMI B and C)
239 */
240 if (IS_CHERRYVIEW(i915))
241 return phy == DPIO_PHY0 ? IOSF_PORT_DPIO_2 : IOSF_PORT_DPIO;
242 else
243 return IOSF_PORT_DPIO;
244}
245
246u32 vlv_dpio_read(struct drm_i915_private *i915, enum pipe pipe, int reg)
247{
248 u32 port = vlv_dpio_phy_iosf_port(i915, DPIO_PHY(pipe));
249 u32 val = 0;
250
251 vlv_sideband_rw(i915, DPIO_DEVFN, port, SB_MRD_NP, reg, &val);
252
253 /*
254 * FIXME: There might be some registers where all 1's is a valid value,
255 * so ideally we should check the register offset instead...
256 */
257 drm_WARN(&i915->drm, val == 0xffffffff,
258 "DPIO read pipe %c reg 0x%x == 0x%x\n",
259 pipe_name(pipe), reg, val);
260
261 return val;
262}
263
264void vlv_dpio_write(struct drm_i915_private *i915,
265 enum pipe pipe, int reg, u32 val)
266{
267 u32 port = vlv_dpio_phy_iosf_port(i915, DPIO_PHY(pipe));
268
269 vlv_sideband_rw(i915, DPIO_DEVFN, port, SB_MWR_NP, reg, &val);
270}
271
272u32 vlv_flisdsi_read(struct drm_i915_private *i915, u32 reg)
273{
274 u32 val = 0;
275
276 vlv_sideband_rw(i915, DPIO_DEVFN, IOSF_PORT_FLISDSI, SB_CRRDDA_NP,
277 reg, &val);
278 return val;
279}
280
281void vlv_flisdsi_write(struct drm_i915_private *i915, u32 reg, u32 val)
282{
283 vlv_sideband_rw(i915, DPIO_DEVFN, IOSF_PORT_FLISDSI, SB_CRWRDA_NP,
284 reg, &val);
285}
286
287/* SBI access */
288static int intel_sbi_rw(struct drm_i915_private *i915, u16 reg,
289 enum intel_sbi_destination destination,
290 u32 *val, bool is_read)
291{
292 struct intel_uncore *uncore = &i915->uncore;
293 u32 cmd;
294
295 lockdep_assert_held(&i915->sb_lock);
296
297 if (intel_wait_for_register_fw(uncore,
298 SBI_CTL_STAT, SBI_BUSY, 0,
299 100)) {
300 drm_err(&i915->drm,
301 "timeout waiting for SBI to become ready\n");
302 return -EBUSY;
303 }
304
305 intel_uncore_write_fw(uncore, SBI_ADDR, (u32)reg << 16);
306 intel_uncore_write_fw(uncore, SBI_DATA, is_read ? 0 : *val);
307
308 if (destination == SBI_ICLK)
309 cmd = SBI_CTL_DEST_ICLK | SBI_CTL_OP_CRRD;
310 else
311 cmd = SBI_CTL_DEST_MPHY | SBI_CTL_OP_IORD;
312 if (!is_read)
313 cmd |= BIT(8);
314 intel_uncore_write_fw(uncore, SBI_CTL_STAT, cmd | SBI_BUSY);
315
316 if (__intel_wait_for_register_fw(uncore,
317 SBI_CTL_STAT, SBI_BUSY, 0,
318 100, 100, &cmd)) {
319 drm_err(&i915->drm,
320 "timeout waiting for SBI to complete read\n");
321 return -ETIMEDOUT;
322 }
323
324 if (cmd & SBI_RESPONSE_FAIL) {
325 drm_err(&i915->drm, "error during SBI read of reg %x\n", reg);
326 return -ENXIO;
327 }
328
329 if (is_read)
330 *val = intel_uncore_read_fw(uncore, SBI_DATA);
331
332 return 0;
333}
334
335u32 intel_sbi_read(struct drm_i915_private *i915, u16 reg,
336 enum intel_sbi_destination destination)
337{
338 u32 result = 0;
339
340 intel_sbi_rw(i915, reg, destination, &result, true);
341
342 return result;
343}
344
345void intel_sbi_write(struct drm_i915_private *i915, u16 reg, u32 value,
346 enum intel_sbi_destination destination)
347{
348 intel_sbi_rw(i915, reg, destination, &value, false);
349}
350
351static int gen6_check_mailbox_status(u32 mbox)
352{
353 switch (mbox & GEN6_PCODE_ERROR_MASK) {
354 case GEN6_PCODE_SUCCESS:
355 return 0;
356 case GEN6_PCODE_UNIMPLEMENTED_CMD:
357 return -ENODEV;
358 case GEN6_PCODE_ILLEGAL_CMD:
359 return -ENXIO;
360 case GEN6_PCODE_MIN_FREQ_TABLE_GT_RATIO_OUT_OF_RANGE:
361 case GEN7_PCODE_MIN_FREQ_TABLE_GT_RATIO_OUT_OF_RANGE:
362 return -EOVERFLOW;
363 case GEN6_PCODE_TIMEOUT:
364 return -ETIMEDOUT;
365 default:
366 MISSING_CASE(mbox & GEN6_PCODE_ERROR_MASK);
367 return 0;
368 }
369}
370
371static int gen7_check_mailbox_status(u32 mbox)
372{
373 switch (mbox & GEN6_PCODE_ERROR_MASK) {
374 case GEN6_PCODE_SUCCESS:
375 return 0;
376 case GEN6_PCODE_ILLEGAL_CMD:
377 return -ENXIO;
378 case GEN7_PCODE_TIMEOUT:
379 return -ETIMEDOUT;
380 case GEN7_PCODE_ILLEGAL_DATA:
381 return -EINVAL;
382 case GEN11_PCODE_ILLEGAL_SUBCOMMAND:
383 return -ENXIO;
384 case GEN11_PCODE_LOCKED:
385 return -EBUSY;
386 case GEN11_PCODE_REJECTED:
387 return -EACCES;
388 case GEN7_PCODE_MIN_FREQ_TABLE_GT_RATIO_OUT_OF_RANGE:
389 return -EOVERFLOW;
390 default:
391 MISSING_CASE(mbox & GEN6_PCODE_ERROR_MASK);
392 return 0;
393 }
394}
395
396static int __sandybridge_pcode_rw(struct drm_i915_private *i915,
397 u32 mbox, u32 *val, u32 *val1,
398 int fast_timeout_us,
399 int slow_timeout_ms,
400 bool is_read)
401{
402 struct intel_uncore *uncore = &i915->uncore;
403
404 lockdep_assert_held(&i915->sb_lock);
405
406 /*
407 * GEN6_PCODE_* are outside of the forcewake domain, we can use
408 * intel_uncore_read/write_fw variants to reduce the amount of work
409 * required when reading/writing.
410 */
411
412 if (intel_uncore_read_fw(uncore, GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY)
413 return -EAGAIN;
414
415 intel_uncore_write_fw(uncore, GEN6_PCODE_DATA, *val);
416 intel_uncore_write_fw(uncore, GEN6_PCODE_DATA1, val1 ? *val1 : 0);
417 intel_uncore_write_fw(uncore,
418 GEN6_PCODE_MAILBOX, GEN6_PCODE_READY | mbox);
419
420 if (__intel_wait_for_register_fw(uncore,
421 GEN6_PCODE_MAILBOX,
422 GEN6_PCODE_READY, 0,
423 fast_timeout_us,
424 slow_timeout_ms,
425 &mbox))
426 return -ETIMEDOUT;
427
428 if (is_read)
429 *val = intel_uncore_read_fw(uncore, GEN6_PCODE_DATA);
430 if (is_read && val1)
431 *val1 = intel_uncore_read_fw(uncore, GEN6_PCODE_DATA1);
432
433 if (GRAPHICS_VER(i915) > 6)
434 return gen7_check_mailbox_status(mbox);
435 else
436 return gen6_check_mailbox_status(mbox);
437}
438
439int sandybridge_pcode_read(struct drm_i915_private *i915, u32 mbox,
440 u32 *val, u32 *val1)
441{
442 int err;
443
444 mutex_lock(&i915->sb_lock);
445 err = __sandybridge_pcode_rw(i915, mbox, val, val1,
446 500, 20,
447 true);
448 mutex_unlock(&i915->sb_lock);
449
450 if (err) {
451 drm_dbg(&i915->drm,
452 "warning: pcode (read from mbox %x) mailbox access failed for %ps: %d\n",
453 mbox, __builtin_return_address(0), err);
454 }
455
456 return err;
457}
458
459int sandybridge_pcode_write_timeout(struct drm_i915_private *i915,
460 u32 mbox, u32 val,
461 int fast_timeout_us,
462 int slow_timeout_ms)
463{
464 int err;
465
466 mutex_lock(&i915->sb_lock);
467 err = __sandybridge_pcode_rw(i915, mbox, &val, NULL,
468 fast_timeout_us, slow_timeout_ms,
469 false);
470 mutex_unlock(&i915->sb_lock);
471
472 if (err) {
473 drm_dbg(&i915->drm,
474 "warning: pcode (write of 0x%08x to mbox %x) mailbox access failed for %ps: %d\n",
475 val, mbox, __builtin_return_address(0), err);
476 }
477
478 return err;
479}
480
481static bool skl_pcode_try_request(struct drm_i915_private *i915, u32 mbox,
482 u32 request, u32 reply_mask, u32 reply,
483 u32 *status)
484{
485 *status = __sandybridge_pcode_rw(i915, mbox, &request, NULL,
486 500, 0,
487 true);
488
489 return *status || ((request & reply_mask) == reply);
490}
491
492/**
493 * skl_pcode_request - send PCODE request until acknowledgment
494 * @i915: device private
495 * @mbox: PCODE mailbox ID the request is targeted for
496 * @request: request ID
497 * @reply_mask: mask used to check for request acknowledgment
498 * @reply: value used to check for request acknowledgment
499 * @timeout_base_ms: timeout for polling with preemption enabled
500 *
501 * Keep resending the @request to @mbox until PCODE acknowledges it, PCODE
502 * reports an error or an overall timeout of @timeout_base_ms+50 ms expires.
503 * The request is acknowledged once the PCODE reply dword equals @reply after
504 * applying @reply_mask. Polling is first attempted with preemption enabled
505 * for @timeout_base_ms and if this times out for another 50 ms with
506 * preemption disabled.
507 *
508 * Returns 0 on success, %-ETIMEDOUT in case of a timeout, <0 in case of some
509 * other error as reported by PCODE.
510 */
511int skl_pcode_request(struct drm_i915_private *i915, u32 mbox, u32 request,
512 u32 reply_mask, u32 reply, int timeout_base_ms)
513{
514 u32 status;
515 int ret;
516
517 mutex_lock(&i915->sb_lock);
518
519#define COND \
520 skl_pcode_try_request(i915, mbox, request, reply_mask, reply, &status)
521
522 /*
523 * Prime the PCODE by doing a request first. Normally it guarantees
524 * that a subsequent request, at most @timeout_base_ms later, succeeds.
525 * _wait_for() doesn't guarantee when its passed condition is evaluated
526 * first, so send the first request explicitly.
527 */
528 if (COND) {
529 ret = 0;
530 goto out;
531 }
532 ret = _wait_for(COND, timeout_base_ms * 1000, 10, 10);
533 if (!ret)
534 goto out;
535
536 /*
537 * The above can time out if the number of requests was low (2 in the
538 * worst case) _and_ PCODE was busy for some reason even after a
539 * (queued) request and @timeout_base_ms delay. As a workaround retry
540 * the poll with preemption disabled to maximize the number of
541 * requests. Increase the timeout from @timeout_base_ms to 50ms to
542 * account for interrupts that could reduce the number of these
543 * requests, and for any quirks of the PCODE firmware that delays
544 * the request completion.
545 */
546 drm_dbg_kms(&i915->drm,
547 "PCODE timeout, retrying with preemption disabled\n");
548 drm_WARN_ON_ONCE(&i915->drm, timeout_base_ms > 3);
549 preempt_disable();
550 ret = wait_for_atomic(COND, 50);
551 preempt_enable();
552
553out:
554 mutex_unlock(&i915->sb_lock);
555 return ret ? ret : status;
556#undef COND
557}
558
559void intel_pcode_init(struct drm_i915_private *i915)
560{
561 int ret;
562
563 if (!IS_DGFX(i915))
564 return;
565
566 ret = skl_pcode_request(i915, DG1_PCODE_STATUS,
567 DG1_UNCORE_GET_INIT_STATUS,
568 DG1_UNCORE_INIT_STATUS_COMPLETE,
569 DG1_UNCORE_INIT_STATUS_COMPLETE, 50);
570 if (ret)
571 drm_err(&i915->drm, "Pcode did not report uncore initialization completion!\n");
572}