1 /*
2  * Copyright 2008 Advanced Micro Devices, Inc.
3  * Copyright 2008 Red Hat Inc.
4  * Copyright 2009 Jerome Glisse.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the "Software"),
8  * to deal in the Software without restriction, including without limitation
9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10  * and/or sell copies of the Software, and to permit persons to whom the
11  * Software is furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22  * OTHER DEALINGS IN THE SOFTWARE.
23  *
24  * Authors: Dave Airlie
25  *          Alex Deucher
26  *          Jerome Glisse
27  */
28 
29 #include <linux/pci.h>
30 #include <linux/pm_runtime.h>
31 
32 #include <drm/drm_crtc_helper.h>
33 #include <drm/drm_device.h>
34 #include <drm/drm_drv.h>
35 #include <drm/drm_probe_helper.h>
36 #include <drm/drm_vblank.h>
37 #include <drm/radeon_drm.h>
38 
39 #include "atom.h"
40 #include "radeon.h"
41 #include "radeon_kms.h"
42 #include "radeon_reg.h"
43 
44 
45 #define RADEON_WAIT_IDLE_TIMEOUT 200
46 
47 /*
48  * radeon_driver_irq_handler_kms - irq handler for KMS
49  *
50  * This is the irq handler for the radeon KMS driver (all asics).
51  * radeon_irq_process is a macro that points to the per-asic
52  * irq handler callback.
53  */
54 static irqreturn_t radeon_driver_irq_handler_kms(int irq, void *arg)
55 {
56 	struct drm_device *dev = (struct drm_device *) arg;
57 	struct radeon_device *rdev = dev->dev_private;
58 	irqreturn_t ret;
59 
60 	ret = radeon_irq_process(rdev);
61 	if (ret == IRQ_HANDLED)
62 		pm_runtime_mark_last_busy(dev->dev);
63 	return ret;
64 }
65 
66 /*
67  * Handle hotplug events outside the interrupt handler proper.
68  */
69 /**
70  * radeon_hotplug_work_func - display hotplug work handler
71  *
72  * @work: work struct
73  *
74  * This is the hot plug event work handler (all asics).
75  * The work gets scheduled from the irq handler if there
76  * was a hot plug interrupt.  It walks the connector table
77  * and calls the hotplug handler for each one, then sends
78  * a drm hotplug event to alert userspace.
79  */
80 static void radeon_hotplug_work_func(struct work_struct *work)
81 {
82 	struct radeon_device *rdev = container_of(work, struct radeon_device,
83 						  hotplug_work.work);
84 	struct drm_device *dev = rdev->ddev;
85 	struct drm_mode_config *mode_config = &dev->mode_config;
86 	struct drm_connector *connector;
87 
88 	/* we can race here at startup, some boards seem to trigger
89 	 * hotplug irqs when they shouldn't. */
90 	if (!rdev->mode_info.mode_config_initialized)
91 		return;
92 
93 	mutex_lock(&mode_config->mutex);
94 	list_for_each_entry(connector, &mode_config->connector_list, head)
95 		radeon_connector_hotplug(connector);
96 	mutex_unlock(&mode_config->mutex);
97 	/* Just fire off a uevent and let userspace tell us what to do */
98 	drm_helper_hpd_irq_event(dev);
99 }
100 
101 static void radeon_dp_work_func(struct work_struct *work)
102 {
103 }
104 
105 /**
106  * radeon_driver_irq_preinstall_kms - drm irq preinstall callback
107  *
108  * @dev: drm dev pointer
109  *
110  * Gets the hw ready to enable irqs (all asics).
111  * This function disables all interrupt sources on the GPU.
112  */
113 static void radeon_driver_irq_preinstall_kms(struct drm_device *dev)
114 {
115 	struct radeon_device *rdev = dev->dev_private;
116 	unsigned long irqflags;
117 	unsigned i;
118 
119 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
120 	/* Disable *all* interrupts */
121 	for (i = 0; i < RADEON_NUM_RINGS; i++)
122 		atomic_set(&rdev->irq.ring_int[i], 0);
123 	rdev->irq.dpm_thermal = false;
124 	for (i = 0; i < RADEON_MAX_HPD_PINS; i++)
125 		rdev->irq.hpd[i] = false;
126 	for (i = 0; i < RADEON_MAX_CRTCS; i++) {
127 		rdev->irq.crtc_vblank_int[i] = false;
128 		atomic_set(&rdev->irq.pflip[i], 0);
129 		rdev->irq.afmt[i] = false;
130 	}
131 	radeon_irq_set(rdev);
132 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
133 	/* Clear bits */
134 	radeon_irq_process(rdev);
135 }
136 
137 /**
138  * radeon_driver_irq_postinstall_kms - drm irq preinstall callback
139  *
140  * @dev: drm dev pointer
141  *
142  * Handles stuff to be done after enabling irqs (all asics).
143  * Returns 0 on success.
144  */
145 static int radeon_driver_irq_postinstall_kms(struct drm_device *dev)
146 {
147 	struct radeon_device *rdev = dev->dev_private;
148 
149 	if (ASIC_IS_AVIVO(rdev))
150 		dev->max_vblank_count = 0x00ffffff;
151 	else
152 		dev->max_vblank_count = 0x001fffff;
153 
154 	return 0;
155 }
156 
157 /**
158  * radeon_driver_irq_uninstall_kms - drm irq uninstall callback
159  *
160  * @dev: drm dev pointer
161  *
162  * This function disables all interrupt sources on the GPU (all asics).
163  */
164 static void radeon_driver_irq_uninstall_kms(struct drm_device *dev)
165 {
166 	struct radeon_device *rdev = dev->dev_private;
167 	unsigned long irqflags;
168 	unsigned i;
169 
170 	if (rdev == NULL) {
171 		return;
172 	}
173 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
174 	/* Disable *all* interrupts */
175 	for (i = 0; i < RADEON_NUM_RINGS; i++)
176 		atomic_set(&rdev->irq.ring_int[i], 0);
177 	rdev->irq.dpm_thermal = false;
178 	for (i = 0; i < RADEON_MAX_HPD_PINS; i++)
179 		rdev->irq.hpd[i] = false;
180 	for (i = 0; i < RADEON_MAX_CRTCS; i++) {
181 		rdev->irq.crtc_vblank_int[i] = false;
182 		atomic_set(&rdev->irq.pflip[i], 0);
183 		rdev->irq.afmt[i] = false;
184 	}
185 	radeon_irq_set(rdev);
186 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
187 }
188 
189 static int radeon_irq_install(struct radeon_device *rdev, int irq)
190 {
191 	struct drm_device *dev = rdev->ddev;
192 	int ret;
193 
194 	if (irq == IRQ_NOTCONNECTED)
195 		return -ENOTCONN;
196 
197 	radeon_driver_irq_preinstall_kms(dev);
198 
199 	/* PCI devices require shared interrupts. */
200 	ret = request_irq(irq, radeon_driver_irq_handler_kms,
201 			  IRQF_SHARED, dev->driver->name, dev);
202 	if (ret)
203 		return ret;
204 
205 	radeon_driver_irq_postinstall_kms(dev);
206 
207 	return 0;
208 }
209 
210 static void radeon_irq_uninstall(struct radeon_device *rdev)
211 {
212 	struct drm_device *dev = rdev->ddev;
213 	struct pci_dev *pdev = to_pci_dev(dev->dev);
214 
215 	radeon_driver_irq_uninstall_kms(dev);
216 	free_irq(pdev->irq, dev);
217 }
218 
219 /**
220  * radeon_msi_ok - asic specific msi checks
221  *
222  * @rdev: radeon device pointer
223  *
224  * Handles asic specific MSI checks to determine if
225  * MSIs should be enabled on a particular chip (all asics).
226  * Returns true if MSIs should be enabled, false if MSIs
227  * should not be enabled.
228  */
229 static bool radeon_msi_ok(struct radeon_device *rdev)
230 {
231 	/* RV370/RV380 was first asic with MSI support */
232 	if (rdev->family < CHIP_RV380)
233 		return false;
234 
235 	/* MSIs don't work on AGP */
236 	if (rdev->flags & RADEON_IS_AGP)
237 		return false;
238 
239 	/*
240 	 * Older chips have a HW limitation, they can only generate 40 bits
241 	 * of address for "64-bit" MSIs which breaks on some platforms, notably
242 	 * IBM POWER servers, so we limit them
243 	 */
244 	if (rdev->family < CHIP_BONAIRE) {
245 		dev_info(rdev->dev, "radeon: MSI limited to 32-bit\n");
246 		rdev->pdev->no_64bit_msi = 1;
247 	}
248 
249 	/* force MSI on */
250 	if (radeon_msi == 1)
251 		return true;
252 	else if (radeon_msi == 0)
253 		return false;
254 
255 	/* Quirks */
256 	/* HP RS690 only seems to work with MSIs. */
257 	if ((rdev->pdev->device == 0x791f) &&
258 	    (rdev->pdev->subsystem_vendor == 0x103c) &&
259 	    (rdev->pdev->subsystem_device == 0x30c2))
260 		return true;
261 
262 	/* Dell RS690 only seems to work with MSIs. */
263 	if ((rdev->pdev->device == 0x791f) &&
264 	    (rdev->pdev->subsystem_vendor == 0x1028) &&
265 	    (rdev->pdev->subsystem_device == 0x01fc))
266 		return true;
267 
268 	/* Dell RS690 only seems to work with MSIs. */
269 	if ((rdev->pdev->device == 0x791f) &&
270 	    (rdev->pdev->subsystem_vendor == 0x1028) &&
271 	    (rdev->pdev->subsystem_device == 0x01fd))
272 		return true;
273 
274 	/* Gateway RS690 only seems to work with MSIs. */
275 	if ((rdev->pdev->device == 0x791f) &&
276 	    (rdev->pdev->subsystem_vendor == 0x107b) &&
277 	    (rdev->pdev->subsystem_device == 0x0185))
278 		return true;
279 
280 	/* try and enable MSIs by default on all RS690s */
281 	if (rdev->family == CHIP_RS690)
282 		return true;
283 
284 	/* RV515 seems to have MSI issues where it loses
285 	 * MSI rearms occasionally. This leads to lockups and freezes.
286 	 * disable it by default.
287 	 */
288 	if (rdev->family == CHIP_RV515)
289 		return false;
290 	if (rdev->flags & RADEON_IS_IGP) {
291 		/* APUs work fine with MSIs */
292 		if (rdev->family >= CHIP_PALM)
293 			return true;
294 		/* lots of IGPs have problems with MSIs */
295 		return false;
296 	}
297 
298 	return true;
299 }
300 
301 /**
302  * radeon_irq_kms_init - init driver interrupt info
303  *
304  * @rdev: radeon device pointer
305  *
306  * Sets up the work irq handlers, vblank init, MSIs, etc. (all asics).
307  * Returns 0 for success, error for failure.
308  */
309 int radeon_irq_kms_init(struct radeon_device *rdev)
310 {
311 	int r = 0;
312 
313 	spin_lock_init(&rdev->irq.lock);
314 
315 	/* Disable vblank irqs aggressively for power-saving */
316 	rdev->ddev->vblank_disable_immediate = true;
317 
318 	r = drm_vblank_init(rdev->ddev, rdev->num_crtc);
319 	if (r) {
320 		return r;
321 	}
322 
323 	/* enable msi */
324 	rdev->msi_enabled = 0;
325 
326 	if (radeon_msi_ok(rdev)) {
327 		int ret = pci_enable_msi(rdev->pdev);
328 		if (!ret) {
329 			rdev->msi_enabled = 1;
330 			dev_info(rdev->dev, "radeon: using MSI.\n");
331 		}
332 	}
333 
334 	INIT_DELAYED_WORK(&rdev->hotplug_work, radeon_hotplug_work_func);
335 	INIT_WORK(&rdev->dp_work, radeon_dp_work_func);
336 	INIT_WORK(&rdev->audio_work, r600_audio_update_hdmi);
337 
338 	rdev->irq.installed = true;
339 	r = radeon_irq_install(rdev, rdev->pdev->irq);
340 	if (r) {
341 		rdev->irq.installed = false;
342 		flush_delayed_work(&rdev->hotplug_work);
343 		return r;
344 	}
345 
346 	DRM_INFO("radeon: irq initialized.\n");
347 	return 0;
348 }
349 
350 /**
351  * radeon_irq_kms_fini - tear down driver interrupt info
352  *
353  * @rdev: radeon device pointer
354  *
355  * Tears down the work irq handlers, vblank handlers, MSIs, etc. (all asics).
356  */
357 void radeon_irq_kms_fini(struct radeon_device *rdev)
358 {
359 	if (rdev->irq.installed) {
360 		radeon_irq_uninstall(rdev);
361 		rdev->irq.installed = false;
362 		if (rdev->msi_enabled)
363 			pci_disable_msi(rdev->pdev);
364 		flush_delayed_work(&rdev->hotplug_work);
365 	}
366 }
367 
368 /**
369  * radeon_irq_kms_sw_irq_get - enable software interrupt
370  *
371  * @rdev: radeon device pointer
372  * @ring: ring whose interrupt you want to enable
373  *
374  * Enables the software interrupt for a specific ring (all asics).
375  * The software interrupt is generally used to signal a fence on
376  * a particular ring.
377  */
378 void radeon_irq_kms_sw_irq_get(struct radeon_device *rdev, int ring)
379 {
380 	unsigned long irqflags;
381 
382 	if (!rdev->irq.installed)
383 		return;
384 
385 	if (atomic_inc_return(&rdev->irq.ring_int[ring]) == 1) {
386 		spin_lock_irqsave(&rdev->irq.lock, irqflags);
387 		radeon_irq_set(rdev);
388 		spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
389 	}
390 }
391 
392 /**
393  * radeon_irq_kms_sw_irq_get_delayed - enable software interrupt
394  *
395  * @rdev: radeon device pointer
396  * @ring: ring whose interrupt you want to enable
397  *
398  * Enables the software interrupt for a specific ring (all asics).
399  * The software interrupt is generally used to signal a fence on
400  * a particular ring.
401  */
402 bool radeon_irq_kms_sw_irq_get_delayed(struct radeon_device *rdev, int ring)
403 {
404 	return atomic_inc_return(&rdev->irq.ring_int[ring]) == 1;
405 }
406 
407 /**
408  * radeon_irq_kms_sw_irq_put - disable software interrupt
409  *
410  * @rdev: radeon device pointer
411  * @ring: ring whose interrupt you want to disable
412  *
413  * Disables the software interrupt for a specific ring (all asics).
414  * The software interrupt is generally used to signal a fence on
415  * a particular ring.
416  */
417 void radeon_irq_kms_sw_irq_put(struct radeon_device *rdev, int ring)
418 {
419 	unsigned long irqflags;
420 
421 	if (!rdev->irq.installed)
422 		return;
423 
424 	if (atomic_dec_and_test(&rdev->irq.ring_int[ring])) {
425 		spin_lock_irqsave(&rdev->irq.lock, irqflags);
426 		radeon_irq_set(rdev);
427 		spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
428 	}
429 }
430 
431 /**
432  * radeon_irq_kms_pflip_irq_get - enable pageflip interrupt
433  *
434  * @rdev: radeon device pointer
435  * @crtc: crtc whose interrupt you want to enable
436  *
437  * Enables the pageflip interrupt for a specific crtc (all asics).
438  * For pageflips we use the vblank interrupt source.
439  */
440 void radeon_irq_kms_pflip_irq_get(struct radeon_device *rdev, int crtc)
441 {
442 	unsigned long irqflags;
443 
444 	if (crtc < 0 || crtc >= rdev->num_crtc)
445 		return;
446 
447 	if (!rdev->irq.installed)
448 		return;
449 
450 	if (atomic_inc_return(&rdev->irq.pflip[crtc]) == 1) {
451 		spin_lock_irqsave(&rdev->irq.lock, irqflags);
452 		radeon_irq_set(rdev);
453 		spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
454 	}
455 }
456 
457 /**
458  * radeon_irq_kms_pflip_irq_put - disable pageflip interrupt
459  *
460  * @rdev: radeon device pointer
461  * @crtc: crtc whose interrupt you want to disable
462  *
463  * Disables the pageflip interrupt for a specific crtc (all asics).
464  * For pageflips we use the vblank interrupt source.
465  */
466 void radeon_irq_kms_pflip_irq_put(struct radeon_device *rdev, int crtc)
467 {
468 	unsigned long irqflags;
469 
470 	if (crtc < 0 || crtc >= rdev->num_crtc)
471 		return;
472 
473 	if (!rdev->irq.installed)
474 		return;
475 
476 	if (atomic_dec_and_test(&rdev->irq.pflip[crtc])) {
477 		spin_lock_irqsave(&rdev->irq.lock, irqflags);
478 		radeon_irq_set(rdev);
479 		spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
480 	}
481 }
482 
483 /**
484  * radeon_irq_kms_enable_afmt - enable audio format change interrupt
485  *
486  * @rdev: radeon device pointer
487  * @block: afmt block whose interrupt you want to enable
488  *
489  * Enables the afmt change interrupt for a specific afmt block (all asics).
490  */
491 void radeon_irq_kms_enable_afmt(struct radeon_device *rdev, int block)
492 {
493 	unsigned long irqflags;
494 
495 	if (!rdev->irq.installed)
496 		return;
497 
498 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
499 	rdev->irq.afmt[block] = true;
500 	radeon_irq_set(rdev);
501 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
502 
503 }
504 
505 /**
506  * radeon_irq_kms_disable_afmt - disable audio format change interrupt
507  *
508  * @rdev: radeon device pointer
509  * @block: afmt block whose interrupt you want to disable
510  *
511  * Disables the afmt change interrupt for a specific afmt block (all asics).
512  */
513 void radeon_irq_kms_disable_afmt(struct radeon_device *rdev, int block)
514 {
515 	unsigned long irqflags;
516 
517 	if (!rdev->irq.installed)
518 		return;
519 
520 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
521 	rdev->irq.afmt[block] = false;
522 	radeon_irq_set(rdev);
523 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
524 }
525 
526 /**
527  * radeon_irq_kms_enable_hpd - enable hotplug detect interrupt
528  *
529  * @rdev: radeon device pointer
530  * @hpd_mask: mask of hpd pins you want to enable.
531  *
532  * Enables the hotplug detect interrupt for a specific hpd pin (all asics).
533  */
534 void radeon_irq_kms_enable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
535 {
536 	unsigned long irqflags;
537 	int i;
538 
539 	if (!rdev->irq.installed)
540 		return;
541 
542 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
543 	for (i = 0; i < RADEON_MAX_HPD_PINS; ++i)
544 		rdev->irq.hpd[i] |= !!(hpd_mask & (1 << i));
545 	radeon_irq_set(rdev);
546 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
547 }
548 
549 /**
550  * radeon_irq_kms_disable_hpd - disable hotplug detect interrupt
551  *
552  * @rdev: radeon device pointer
553  * @hpd_mask: mask of hpd pins you want to disable.
554  *
555  * Disables the hotplug detect interrupt for a specific hpd pin (all asics).
556  */
557 void radeon_irq_kms_disable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
558 {
559 	unsigned long irqflags;
560 	int i;
561 
562 	if (!rdev->irq.installed)
563 		return;
564 
565 	spin_lock_irqsave(&rdev->irq.lock, irqflags);
566 	for (i = 0; i < RADEON_MAX_HPD_PINS; ++i)
567 		rdev->irq.hpd[i] &= !(hpd_mask & (1 << i));
568 	radeon_irq_set(rdev);
569 	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
570 }
571 
572 /**
573  * radeon_irq_kms_set_irq_n_enabled - helper for updating interrupt enable registers
574  *
575  * @rdev: radeon device pointer
576  * @reg: the register to write to enable/disable interrupts
577  * @mask: the mask that enables the interrupts
578  * @enable: whether to enable or disable the interrupt register
579  * @name: the name of the interrupt register to print to the kernel log
580  * @n: the number of the interrupt register to print to the kernel log
581  *
582  * Helper for updating the enable state of interrupt registers. Checks whether
583  * or not the interrupt matches the enable state we want. If it doesn't, then
584  * we update it and print a debugging message to the kernel log indicating the
585  * new state of the interrupt register.
586  *
587  * Used for updating sequences of interrupts registers like HPD1, HPD2, etc.
588  */
589 void radeon_irq_kms_set_irq_n_enabled(struct radeon_device *rdev,
590 				      u32 reg, u32 mask,
591 				      bool enable, const char *name, unsigned n)
592 {
593 	u32 tmp = RREG32(reg);
594 
595 	/* Interrupt state didn't change */
596 	if (!!(tmp & mask) == enable)
597 		return;
598 
599 	if (enable) {
600 		DRM_DEBUG("%s%d interrupts enabled\n", name, n);
601 		WREG32(reg, tmp |= mask);
602 	} else {
603 		DRM_DEBUG("%s%d interrupts disabled\n", name, n);
604 		WREG32(reg, tmp & ~mask);
605 	}
606 }
607