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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2014 The Linux Foundation. All rights reserved.
4 * Copyright (C) 2013 Red Hat
5 * Author: Rob Clark <robdclark@gmail.com>
6 */
7
8#include <linux/clk.h>
9#include <linux/component.h>
10#include <linux/platform_device.h>
11#include <linux/pm_runtime.h>
12
13#include "vc4_drv.h"
14#include "vc4_regs.h"
15
16static const struct debugfs_reg32 v3d_regs[] = {
17 VC4_REG32(V3D_IDENT0),
18 VC4_REG32(V3D_IDENT1),
19 VC4_REG32(V3D_IDENT2),
20 VC4_REG32(V3D_SCRATCH),
21 VC4_REG32(V3D_L2CACTL),
22 VC4_REG32(V3D_SLCACTL),
23 VC4_REG32(V3D_INTCTL),
24 VC4_REG32(V3D_INTENA),
25 VC4_REG32(V3D_INTDIS),
26 VC4_REG32(V3D_CT0CS),
27 VC4_REG32(V3D_CT1CS),
28 VC4_REG32(V3D_CT0EA),
29 VC4_REG32(V3D_CT1EA),
30 VC4_REG32(V3D_CT0CA),
31 VC4_REG32(V3D_CT1CA),
32 VC4_REG32(V3D_CT00RA0),
33 VC4_REG32(V3D_CT01RA0),
34 VC4_REG32(V3D_CT0LC),
35 VC4_REG32(V3D_CT1LC),
36 VC4_REG32(V3D_CT0PC),
37 VC4_REG32(V3D_CT1PC),
38 VC4_REG32(V3D_PCS),
39 VC4_REG32(V3D_BFC),
40 VC4_REG32(V3D_RFC),
41 VC4_REG32(V3D_BPCA),
42 VC4_REG32(V3D_BPCS),
43 VC4_REG32(V3D_BPOA),
44 VC4_REG32(V3D_BPOS),
45 VC4_REG32(V3D_BXCF),
46 VC4_REG32(V3D_SQRSV0),
47 VC4_REG32(V3D_SQRSV1),
48 VC4_REG32(V3D_SQCNTL),
49 VC4_REG32(V3D_SRQPC),
50 VC4_REG32(V3D_SRQUA),
51 VC4_REG32(V3D_SRQUL),
52 VC4_REG32(V3D_SRQCS),
53 VC4_REG32(V3D_VPACNTL),
54 VC4_REG32(V3D_VPMBASE),
55 VC4_REG32(V3D_PCTRC),
56 VC4_REG32(V3D_PCTRE),
57 VC4_REG32(V3D_PCTR(0)),
58 VC4_REG32(V3D_PCTRS(0)),
59 VC4_REG32(V3D_PCTR(1)),
60 VC4_REG32(V3D_PCTRS(1)),
61 VC4_REG32(V3D_PCTR(2)),
62 VC4_REG32(V3D_PCTRS(2)),
63 VC4_REG32(V3D_PCTR(3)),
64 VC4_REG32(V3D_PCTRS(3)),
65 VC4_REG32(V3D_PCTR(4)),
66 VC4_REG32(V3D_PCTRS(4)),
67 VC4_REG32(V3D_PCTR(5)),
68 VC4_REG32(V3D_PCTRS(5)),
69 VC4_REG32(V3D_PCTR(6)),
70 VC4_REG32(V3D_PCTRS(6)),
71 VC4_REG32(V3D_PCTR(7)),
72 VC4_REG32(V3D_PCTRS(7)),
73 VC4_REG32(V3D_PCTR(8)),
74 VC4_REG32(V3D_PCTRS(8)),
75 VC4_REG32(V3D_PCTR(9)),
76 VC4_REG32(V3D_PCTRS(9)),
77 VC4_REG32(V3D_PCTR(10)),
78 VC4_REG32(V3D_PCTRS(10)),
79 VC4_REG32(V3D_PCTR(11)),
80 VC4_REG32(V3D_PCTRS(11)),
81 VC4_REG32(V3D_PCTR(12)),
82 VC4_REG32(V3D_PCTRS(12)),
83 VC4_REG32(V3D_PCTR(13)),
84 VC4_REG32(V3D_PCTRS(13)),
85 VC4_REG32(V3D_PCTR(14)),
86 VC4_REG32(V3D_PCTRS(14)),
87 VC4_REG32(V3D_PCTR(15)),
88 VC4_REG32(V3D_PCTRS(15)),
89 VC4_REG32(V3D_DBGE),
90 VC4_REG32(V3D_FDBGO),
91 VC4_REG32(V3D_FDBGB),
92 VC4_REG32(V3D_FDBGR),
93 VC4_REG32(V3D_FDBGS),
94 VC4_REG32(V3D_ERRSTAT),
95};
96
97static int vc4_v3d_debugfs_ident(struct seq_file *m, void *unused)
98{
99 struct drm_debugfs_entry *entry = m->private;
100 struct drm_device *dev = entry->dev;
101 struct vc4_dev *vc4 = to_vc4_dev(dev);
102 int ret = vc4_v3d_pm_get(vc4);
103
104 if (ret == 0) {
105 uint32_t ident1 = V3D_READ(V3D_IDENT1);
106 uint32_t nslc = VC4_GET_FIELD(ident1, V3D_IDENT1_NSLC);
107 uint32_t tups = VC4_GET_FIELD(ident1, V3D_IDENT1_TUPS);
108 uint32_t qups = VC4_GET_FIELD(ident1, V3D_IDENT1_QUPS);
109
110 seq_printf(m, "Revision: %d\n",
111 VC4_GET_FIELD(ident1, V3D_IDENT1_REV));
112 seq_printf(m, "Slices: %d\n", nslc);
113 seq_printf(m, "TMUs: %d\n", nslc * tups);
114 seq_printf(m, "QPUs: %d\n", nslc * qups);
115 seq_printf(m, "Semaphores: %d\n",
116 VC4_GET_FIELD(ident1, V3D_IDENT1_NSEM));
117 vc4_v3d_pm_put(vc4);
118 }
119
120 return 0;
121}
122
123/*
124 * Wraps pm_runtime_get_sync() in a refcount, so that we can reliably
125 * get the pm_runtime refcount to 0 in vc4_reset().
126 */
127int
128vc4_v3d_pm_get(struct vc4_dev *vc4)
129{
130 if (WARN_ON_ONCE(vc4->is_vc5))
131 return -ENODEV;
132
133 mutex_lock(&vc4->power_lock);
134 if (vc4->power_refcount++ == 0) {
135 int ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev);
136
137 if (ret < 0) {
138 vc4->power_refcount--;
139 mutex_unlock(&vc4->power_lock);
140 return ret;
141 }
142 }
143 mutex_unlock(&vc4->power_lock);
144
145 return 0;
146}
147
148void
149vc4_v3d_pm_put(struct vc4_dev *vc4)
150{
151 if (WARN_ON_ONCE(vc4->is_vc5))
152 return;
153
154 mutex_lock(&vc4->power_lock);
155 if (--vc4->power_refcount == 0) {
156 pm_runtime_mark_last_busy(&vc4->v3d->pdev->dev);
157 pm_runtime_put_autosuspend(&vc4->v3d->pdev->dev);
158 }
159 mutex_unlock(&vc4->power_lock);
160}
161
162static void vc4_v3d_init_hw(struct drm_device *dev)
163{
164 struct vc4_dev *vc4 = to_vc4_dev(dev);
165
166 /* Take all the memory that would have been reserved for user
167 * QPU programs, since we don't have an interface for running
168 * them, anyway.
169 */
170 V3D_WRITE(V3D_VPMBASE, 0);
171}
172
173int vc4_v3d_get_bin_slot(struct vc4_dev *vc4)
174{
175 struct drm_device *dev = &vc4->base;
176 unsigned long irqflags;
177 int slot;
178 uint64_t seqno = 0;
179 struct vc4_exec_info *exec;
180
181 if (WARN_ON_ONCE(vc4->is_vc5))
182 return -ENODEV;
183
184try_again:
185 spin_lock_irqsave(&vc4->job_lock, irqflags);
186 slot = ffs(~vc4->bin_alloc_used);
187 if (slot != 0) {
188 /* Switch from ffs() bit index to a 0-based index. */
189 slot--;
190 vc4->bin_alloc_used |= BIT(slot);
191 spin_unlock_irqrestore(&vc4->job_lock, irqflags);
192 return slot;
193 }
194
195 /* Couldn't find an open slot. Wait for render to complete
196 * and try again.
197 */
198 exec = vc4_last_render_job(vc4);
199 if (exec)
200 seqno = exec->seqno;
201 spin_unlock_irqrestore(&vc4->job_lock, irqflags);
202
203 if (seqno) {
204 int ret = vc4_wait_for_seqno(dev, seqno, ~0ull, true);
205
206 if (ret == 0)
207 goto try_again;
208
209 return ret;
210 }
211
212 return -ENOMEM;
213}
214
215/*
216 * bin_bo_alloc() - allocates the memory that will be used for
217 * tile binning.
218 *
219 * The binner has a limitation that the addresses in the tile state
220 * buffer that point into the tile alloc buffer or binner overflow
221 * memory only have 28 bits (256MB), and the top 4 on the bus for
222 * tile alloc references end up coming from the tile state buffer's
223 * address.
224 *
225 * To work around this, we allocate a single large buffer while V3D is
226 * in use, make sure that it has the top 4 bits constant across its
227 * entire extent, and then put the tile state, tile alloc, and binner
228 * overflow memory inside that buffer.
229 *
230 * This creates a limitation where we may not be able to execute a job
231 * if it doesn't fit within the buffer that we allocated up front.
232 * However, it turns out that 16MB is "enough for anybody", and
233 * real-world applications run into allocation failures from the
234 * overall DMA pool before they make scenes complicated enough to run
235 * out of bin space.
236 */
237static int bin_bo_alloc(struct vc4_dev *vc4)
238{
239 struct vc4_v3d *v3d = vc4->v3d;
240 uint32_t size = 16 * 1024 * 1024;
241 int ret = 0;
242 struct list_head list;
243
244 if (!v3d)
245 return -ENODEV;
246
247 /* We may need to try allocating more than once to get a BO
248 * that doesn't cross 256MB. Track the ones we've allocated
249 * that failed so far, so that we can free them when we've got
250 * one that succeeded (if we freed them right away, our next
251 * allocation would probably be the same chunk of memory).
252 */
253 INIT_LIST_HEAD(&list);
254
255 while (true) {
256 struct vc4_bo *bo = vc4_bo_create(&vc4->base, size, true,
257 VC4_BO_TYPE_BIN);
258
259 if (IS_ERR(bo)) {
260 ret = PTR_ERR(bo);
261
262 dev_err(&v3d->pdev->dev,
263 "Failed to allocate memory for tile binning: "
264 "%d. You may need to enable DMA or give it "
265 "more memory.",
266 ret);
267 break;
268 }
269
270 /* Check if this BO won't trigger the addressing bug. */
271 if ((bo->base.dma_addr & 0xf0000000) ==
272 ((bo->base.dma_addr + bo->base.base.size - 1) & 0xf0000000)) {
273 vc4->bin_bo = bo;
274
275 /* Set up for allocating 512KB chunks of
276 * binner memory. The biggest allocation we
277 * need to do is for the initial tile alloc +
278 * tile state buffer. We can render to a
279 * maximum of ((2048*2048) / (32*32) = 4096
280 * tiles in a frame (until we do floating
281 * point rendering, at which point it would be
282 * 8192). Tile state is 48b/tile (rounded to
283 * a page), and tile alloc is 32b/tile
284 * (rounded to a page), plus a page of extra,
285 * for a total of 320kb for our worst-case.
286 * We choose 512kb so that it divides evenly
287 * into our 16MB, and the rest of the 512kb
288 * will be used as storage for the overflow
289 * from the initial 32b CL per bin.
290 */
291 vc4->bin_alloc_size = 512 * 1024;
292 vc4->bin_alloc_used = 0;
293 vc4->bin_alloc_overflow = 0;
294 WARN_ON_ONCE(sizeof(vc4->bin_alloc_used) * 8 !=
295 bo->base.base.size / vc4->bin_alloc_size);
296
297 kref_init(&vc4->bin_bo_kref);
298
299 /* Enable the out-of-memory interrupt to set our
300 * newly-allocated binner BO, potentially from an
301 * already-pending-but-masked interrupt.
302 */
303 V3D_WRITE(V3D_INTENA, V3D_INT_OUTOMEM);
304
305 break;
306 }
307
308 /* Put it on the list to free later, and try again. */
309 list_add(&bo->unref_head, &list);
310 }
311
312 /* Free all the BOs we allocated but didn't choose. */
313 while (!list_empty(&list)) {
314 struct vc4_bo *bo = list_last_entry(&list,
315 struct vc4_bo, unref_head);
316
317 list_del(&bo->unref_head);
318 drm_gem_object_put(&bo->base.base);
319 }
320
321 return ret;
322}
323
324int vc4_v3d_bin_bo_get(struct vc4_dev *vc4, bool *used)
325{
326 int ret = 0;
327
328 if (WARN_ON_ONCE(vc4->is_vc5))
329 return -ENODEV;
330
331 mutex_lock(&vc4->bin_bo_lock);
332
333 if (used && *used)
334 goto complete;
335
336 if (vc4->bin_bo)
337 kref_get(&vc4->bin_bo_kref);
338 else
339 ret = bin_bo_alloc(vc4);
340
341 if (ret == 0 && used)
342 *used = true;
343
344complete:
345 mutex_unlock(&vc4->bin_bo_lock);
346
347 return ret;
348}
349
350static void bin_bo_release(struct kref *ref)
351{
352 struct vc4_dev *vc4 = container_of(ref, struct vc4_dev, bin_bo_kref);
353
354 if (WARN_ON_ONCE(!vc4->bin_bo))
355 return;
356
357 drm_gem_object_put(&vc4->bin_bo->base.base);
358 vc4->bin_bo = NULL;
359}
360
361void vc4_v3d_bin_bo_put(struct vc4_dev *vc4)
362{
363 if (WARN_ON_ONCE(vc4->is_vc5))
364 return;
365
366 mutex_lock(&vc4->bin_bo_lock);
367 kref_put(&vc4->bin_bo_kref, bin_bo_release);
368 mutex_unlock(&vc4->bin_bo_lock);
369}
370
371#ifdef CONFIG_PM
372static int vc4_v3d_runtime_suspend(struct device *dev)
373{
374 struct vc4_v3d *v3d = dev_get_drvdata(dev);
375 struct vc4_dev *vc4 = v3d->vc4;
376
377 vc4_irq_disable(&vc4->base);
378
379 clk_disable_unprepare(v3d->clk);
380
381 return 0;
382}
383
384static int vc4_v3d_runtime_resume(struct device *dev)
385{
386 struct vc4_v3d *v3d = dev_get_drvdata(dev);
387 struct vc4_dev *vc4 = v3d->vc4;
388 int ret;
389
390 ret = clk_prepare_enable(v3d->clk);
391 if (ret != 0)
392 return ret;
393
394 vc4_v3d_init_hw(&vc4->base);
395
396 vc4_irq_enable(&vc4->base);
397
398 return 0;
399}
400#endif
401
402int vc4_v3d_debugfs_init(struct drm_minor *minor)
403{
404 struct drm_device *drm = minor->dev;
405 struct vc4_dev *vc4 = to_vc4_dev(drm);
406 struct vc4_v3d *v3d = vc4->v3d;
407
408 if (!vc4->v3d)
409 return -ENODEV;
410
411 drm_debugfs_add_file(drm, "v3d_ident", vc4_v3d_debugfs_ident, NULL);
412
413 vc4_debugfs_add_regset32(drm, "v3d_regs", &v3d->regset);
414
415 return 0;
416}
417
418static int vc4_v3d_bind(struct device *dev, struct device *master, void *data)
419{
420 struct platform_device *pdev = to_platform_device(dev);
421 struct drm_device *drm = dev_get_drvdata(master);
422 struct vc4_dev *vc4 = to_vc4_dev(drm);
423 struct vc4_v3d *v3d = NULL;
424 int ret;
425
426 v3d = devm_kzalloc(&pdev->dev, sizeof(*v3d), GFP_KERNEL);
427 if (!v3d)
428 return -ENOMEM;
429
430 dev_set_drvdata(dev, v3d);
431
432 v3d->pdev = pdev;
433
434 v3d->regs = vc4_ioremap_regs(pdev, 0);
435 if (IS_ERR(v3d->regs))
436 return PTR_ERR(v3d->regs);
437 v3d->regset.base = v3d->regs;
438 v3d->regset.regs = v3d_regs;
439 v3d->regset.nregs = ARRAY_SIZE(v3d_regs);
440
441 vc4->v3d = v3d;
442 v3d->vc4 = vc4;
443
444 v3d->clk = devm_clk_get(dev, NULL);
445 if (IS_ERR(v3d->clk)) {
446 int ret = PTR_ERR(v3d->clk);
447
448 if (ret == -ENOENT) {
449 /* bcm2835 didn't have a clock reference in the DT. */
450 ret = 0;
451 v3d->clk = NULL;
452 } else {
453 if (ret != -EPROBE_DEFER)
454 dev_err(dev, "Failed to get V3D clock: %d\n",
455 ret);
456 return ret;
457 }
458 }
459
460 ret = platform_get_irq(pdev, 0);
461 if (ret < 0)
462 return ret;
463 vc4->irq = ret;
464
465 ret = devm_pm_runtime_enable(dev);
466 if (ret)
467 return ret;
468
469 ret = pm_runtime_resume_and_get(dev);
470 if (ret)
471 return ret;
472
473 if (V3D_READ(V3D_IDENT0) != V3D_EXPECTED_IDENT0) {
474 DRM_ERROR("V3D_IDENT0 read 0x%08x instead of 0x%08x\n",
475 V3D_READ(V3D_IDENT0), V3D_EXPECTED_IDENT0);
476 ret = -EINVAL;
477 goto err_put_runtime_pm;
478 }
479
480 /* Reset the binner overflow address/size at setup, to be sure
481 * we don't reuse an old one.
482 */
483 V3D_WRITE(V3D_BPOA, 0);
484 V3D_WRITE(V3D_BPOS, 0);
485
486 ret = vc4_irq_install(drm, vc4->irq);
487 if (ret) {
488 DRM_ERROR("Failed to install IRQ handler\n");
489 goto err_put_runtime_pm;
490 }
491
492 pm_runtime_use_autosuspend(dev);
493 pm_runtime_set_autosuspend_delay(dev, 40); /* a little over 2 frames. */
494
495 return 0;
496
497err_put_runtime_pm:
498 pm_runtime_put(dev);
499
500 return ret;
501}
502
503static void vc4_v3d_unbind(struct device *dev, struct device *master,
504 void *data)
505{
506 struct drm_device *drm = dev_get_drvdata(master);
507 struct vc4_dev *vc4 = to_vc4_dev(drm);
508
509 vc4_irq_uninstall(drm);
510
511 /* Disable the binner's overflow memory address, so the next
512 * driver probe (if any) doesn't try to reuse our old
513 * allocation.
514 */
515 V3D_WRITE(V3D_BPOA, 0);
516 V3D_WRITE(V3D_BPOS, 0);
517
518 vc4->v3d = NULL;
519}
520
521static const struct dev_pm_ops vc4_v3d_pm_ops = {
522 SET_RUNTIME_PM_OPS(vc4_v3d_runtime_suspend, vc4_v3d_runtime_resume, NULL)
523};
524
525static const struct component_ops vc4_v3d_ops = {
526 .bind = vc4_v3d_bind,
527 .unbind = vc4_v3d_unbind,
528};
529
530static int vc4_v3d_dev_probe(struct platform_device *pdev)
531{
532 return component_add(&pdev->dev, &vc4_v3d_ops);
533}
534
535static void vc4_v3d_dev_remove(struct platform_device *pdev)
536{
537 component_del(&pdev->dev, &vc4_v3d_ops);
538}
539
540const struct of_device_id vc4_v3d_dt_match[] = {
541 { .compatible = "brcm,bcm2835-v3d" },
542 { .compatible = "brcm,cygnus-v3d" },
543 { .compatible = "brcm,vc4-v3d" },
544 {}
545};
546
547struct platform_driver vc4_v3d_driver = {
548 .probe = vc4_v3d_dev_probe,
549 .remove_new = vc4_v3d_dev_remove,
550 .driver = {
551 .name = "vc4_v3d",
552 .of_match_table = vc4_v3d_dt_match,
553 .pm = &vc4_v3d_pm_ops,
554 },
555};