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#include <drm/drmP.h>
29#include <drm/drm_crtc_helper.h>
30#include <drm/radeon_drm.h>
31#include "radeon_reg.h"
32#include "radeon.h"
33#include "atom.h"
34
35#include <linux/pm_runtime.h>
36
37#define RADEON_WAIT_IDLE_TIMEOUT 200
38
39/**
40 * radeon_driver_irq_handler_kms - irq handler for KMS
41 *
42 * @int irq, void *arg: args
43 *
44 * This is the irq handler for the radeon KMS driver (all asics).
45 * radeon_irq_process is a macro that points to the per-asic
46 * irq handler callback.
47 */
48irqreturn_t radeon_driver_irq_handler_kms(int irq, void *arg)
49{
50	struct drm_device *dev = (struct drm_device *) arg;
51	struct radeon_device *rdev = dev->dev_private;
52	irqreturn_t ret;
53
54	ret = radeon_irq_process(rdev);
55	if (ret == IRQ_HANDLED)
56		pm_runtime_mark_last_busy(dev->dev);
57	return ret;
58}
59
60/*
61 * Handle hotplug events outside the interrupt handler proper.
62 */
63/**
64 * radeon_hotplug_work_func - display hotplug work handler
65 *
66 * @work: work struct
67 *
68 * This is the hot plug event work handler (all asics).
69 * The work gets scheduled from the irq handler if there
70 * was a hot plug interrupt.  It walks the connector table
71 * and calls the hotplug handler for each one, then sends
72 * a drm hotplug event to alert userspace.
73 */
74static void radeon_hotplug_work_func(struct work_struct *work)
75{
76	struct radeon_device *rdev = container_of(work, struct radeon_device,
77						  hotplug_work.work);
78	struct drm_device *dev = rdev->ddev;
79	struct drm_mode_config *mode_config = &dev->mode_config;
80	struct drm_connector *connector;
81
82	/* we can race here at startup, some boards seem to trigger
83	 * hotplug irqs when they shouldn't. */
84	if (!rdev->mode_info.mode_config_initialized)
85		return;
86
87	mutex_lock(&mode_config->mutex);
88	if (mode_config->num_connector) {
89		list_for_each_entry(connector, &mode_config->connector_list, head)
90			radeon_connector_hotplug(connector);
91	}
92	mutex_unlock(&mode_config->mutex);
93	/* Just fire off a uevent and let userspace tell us what to do */
94	drm_helper_hpd_irq_event(dev);
95}
96
97static void radeon_dp_work_func(struct work_struct *work)
98{
99	struct radeon_device *rdev = container_of(work, struct radeon_device,
100						  dp_work);
101	struct drm_device *dev = rdev->ddev;
102	struct drm_mode_config *mode_config = &dev->mode_config;
103	struct drm_connector *connector;
104
105	/* this should take a mutex */
106	if (mode_config->num_connector) {
107		list_for_each_entry(connector, &mode_config->connector_list, head)
108			radeon_connector_hotplug(connector);
109	}
110}
111/**
112 * radeon_driver_irq_preinstall_kms - drm irq preinstall callback
113 *
114 * @dev: drm dev pointer
115 *
116 * Gets the hw ready to enable irqs (all asics).
117 * This function disables all interrupt sources on the GPU.
118 */
119void radeon_driver_irq_preinstall_kms(struct drm_device *dev)
120{
121	struct radeon_device *rdev = dev->dev_private;
122	unsigned long irqflags;
123	unsigned i;
124
125	spin_lock_irqsave(&rdev->irq.lock, irqflags);
126	/* Disable *all* interrupts */
127	for (i = 0; i < RADEON_NUM_RINGS; i++)
128		atomic_set(&rdev->irq.ring_int[i], 0);
129	rdev->irq.dpm_thermal = false;
130	for (i = 0; i < RADEON_MAX_HPD_PINS; i++)
131		rdev->irq.hpd[i] = false;
132	for (i = 0; i < RADEON_MAX_CRTCS; i++) {
133		rdev->irq.crtc_vblank_int[i] = false;
134		atomic_set(&rdev->irq.pflip[i], 0);
135		rdev->irq.afmt[i] = false;
136	}
137	radeon_irq_set(rdev);
138	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
139	/* Clear bits */
140	radeon_irq_process(rdev);
141}
142
143/**
144 * radeon_driver_irq_postinstall_kms - drm irq preinstall callback
145 *
146 * @dev: drm dev pointer
147 *
148 * Handles stuff to be done after enabling irqs (all asics).
149 * Returns 0 on success.
150 */
151int radeon_driver_irq_postinstall_kms(struct drm_device *dev)
152{
153	struct radeon_device *rdev = dev->dev_private;
154
155	if (ASIC_IS_AVIVO(rdev))
156		dev->max_vblank_count = 0x00ffffff;
157	else
158		dev->max_vblank_count = 0x001fffff;
159
160	return 0;
161}
162
163/**
164 * radeon_driver_irq_uninstall_kms - drm irq uninstall callback
165 *
166 * @dev: drm dev pointer
167 *
168 * This function disables all interrupt sources on the GPU (all asics).
169 */
170void radeon_driver_irq_uninstall_kms(struct drm_device *dev)
171{
172	struct radeon_device *rdev = dev->dev_private;
173	unsigned long irqflags;
174	unsigned i;
175
176	if (rdev == NULL) {
177		return;
178	}
179	spin_lock_irqsave(&rdev->irq.lock, irqflags);
180	/* Disable *all* interrupts */
181	for (i = 0; i < RADEON_NUM_RINGS; i++)
182		atomic_set(&rdev->irq.ring_int[i], 0);
183	rdev->irq.dpm_thermal = false;
184	for (i = 0; i < RADEON_MAX_HPD_PINS; i++)
185		rdev->irq.hpd[i] = false;
186	for (i = 0; i < RADEON_MAX_CRTCS; i++) {
187		rdev->irq.crtc_vblank_int[i] = false;
188		atomic_set(&rdev->irq.pflip[i], 0);
189		rdev->irq.afmt[i] = false;
190	}
191	radeon_irq_set(rdev);
192	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
193}
194
195/**
196 * radeon_msi_ok - asic specific msi checks
197 *
198 * @rdev: radeon device pointer
199 *
200 * Handles asic specific MSI checks to determine if
201 * MSIs should be enabled on a particular chip (all asics).
202 * Returns true if MSIs should be enabled, false if MSIs
203 * should not be enabled.
204 */
205static bool radeon_msi_ok(struct radeon_device *rdev)
206{
207	/* RV370/RV380 was first asic with MSI support */
208	if (rdev->family < CHIP_RV380)
209		return false;
210
211	/* MSIs don't work on AGP */
212	if (rdev->flags & RADEON_IS_AGP)
213		return false;
214
215	/*
216	 * Older chips have a HW limitation, they can only generate 40 bits
217	 * of address for "64-bit" MSIs which breaks on some platforms, notably
218	 * IBM POWER servers, so we limit them
219	 */
220	if (rdev->family < CHIP_BONAIRE) {
221		dev_info(rdev->dev, "radeon: MSI limited to 32-bit\n");
222		rdev->pdev->no_64bit_msi = 1;
223	}
224
225	/* force MSI on */
226	if (radeon_msi == 1)
227		return true;
228	else if (radeon_msi == 0)
229		return false;
230
231	/* Quirks */
232	/* HP RS690 only seems to work with MSIs. */
233	if ((rdev->pdev->device == 0x791f) &&
234	    (rdev->pdev->subsystem_vendor == 0x103c) &&
235	    (rdev->pdev->subsystem_device == 0x30c2))
236		return true;
237
238	/* Dell RS690 only seems to work with MSIs. */
239	if ((rdev->pdev->device == 0x791f) &&
240	    (rdev->pdev->subsystem_vendor == 0x1028) &&
241	    (rdev->pdev->subsystem_device == 0x01fc))
242		return true;
243
244	/* Dell RS690 only seems to work with MSIs. */
245	if ((rdev->pdev->device == 0x791f) &&
246	    (rdev->pdev->subsystem_vendor == 0x1028) &&
247	    (rdev->pdev->subsystem_device == 0x01fd))
248		return true;
249
250	/* Gateway RS690 only seems to work with MSIs. */
251	if ((rdev->pdev->device == 0x791f) &&
252	    (rdev->pdev->subsystem_vendor == 0x107b) &&
253	    (rdev->pdev->subsystem_device == 0x0185))
254		return true;
255
256	/* try and enable MSIs by default on all RS690s */
257	if (rdev->family == CHIP_RS690)
258		return true;
259
260	/* RV515 seems to have MSI issues where it loses
261	 * MSI rearms occasionally. This leads to lockups and freezes.
262	 * disable it by default.
263	 */
264	if (rdev->family == CHIP_RV515)
265		return false;
266	if (rdev->flags & RADEON_IS_IGP) {
267		/* APUs work fine with MSIs */
268		if (rdev->family >= CHIP_PALM)
269			return true;
270		/* lots of IGPs have problems with MSIs */
271		return false;
272	}
273
274	return true;
275}
276
277/**
278 * radeon_irq_kms_init - init driver interrupt info
279 *
280 * @rdev: radeon device pointer
281 *
282 * Sets up the work irq handlers, vblank init, MSIs, etc. (all asics).
283 * Returns 0 for success, error for failure.
284 */
285int radeon_irq_kms_init(struct radeon_device *rdev)
286{
287	int r = 0;
288
289	spin_lock_init(&rdev->irq.lock);
290	r = drm_vblank_init(rdev->ddev, rdev->num_crtc);
291	if (r) {
292		return r;
293	}
294	/* enable msi */
295	rdev->msi_enabled = 0;
296
297	if (radeon_msi_ok(rdev)) {
298		int ret = pci_enable_msi(rdev->pdev);
299		if (!ret) {
300			rdev->msi_enabled = 1;
301			dev_info(rdev->dev, "radeon: using MSI.\n");
302		}
303	}
304
305	INIT_DELAYED_WORK(&rdev->hotplug_work, radeon_hotplug_work_func);
306	INIT_WORK(&rdev->dp_work, radeon_dp_work_func);
307	INIT_WORK(&rdev->audio_work, r600_audio_update_hdmi);
308
309	rdev->irq.installed = true;
310	r = drm_irq_install(rdev->ddev, rdev->ddev->pdev->irq);
311	if (r) {
312		rdev->irq.installed = false;
313		flush_delayed_work(&rdev->hotplug_work);
314		return r;
315	}
316
317	DRM_INFO("radeon: irq initialized.\n");
318	return 0;
319}
320
321/**
322 * radeon_irq_kms_fini - tear down driver interrupt info
323 *
324 * @rdev: radeon device pointer
325 *
326 * Tears down the work irq handlers, vblank handlers, MSIs, etc. (all asics).
327 */
328void radeon_irq_kms_fini(struct radeon_device *rdev)
329{
330	drm_vblank_cleanup(rdev->ddev);
331	if (rdev->irq.installed) {
332		drm_irq_uninstall(rdev->ddev);
333		rdev->irq.installed = false;
334		if (rdev->msi_enabled)
335			pci_disable_msi(rdev->pdev);
336		flush_delayed_work(&rdev->hotplug_work);
337	}
338}
339
340/**
341 * radeon_irq_kms_sw_irq_get - enable software interrupt
342 *
343 * @rdev: radeon device pointer
344 * @ring: ring whose interrupt you want to enable
345 *
346 * Enables the software interrupt for a specific ring (all asics).
347 * The software interrupt is generally used to signal a fence on
348 * a particular ring.
349 */
350void radeon_irq_kms_sw_irq_get(struct radeon_device *rdev, int ring)
351{
352	unsigned long irqflags;
353
354	if (!rdev->ddev->irq_enabled)
355		return;
356
357	if (atomic_inc_return(&rdev->irq.ring_int[ring]) == 1) {
358		spin_lock_irqsave(&rdev->irq.lock, irqflags);
359		radeon_irq_set(rdev);
360		spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
361	}
362}
363
364/**
365 * radeon_irq_kms_sw_irq_get_delayed - enable software interrupt
366 *
367 * @rdev: radeon device pointer
368 * @ring: ring whose interrupt you want to enable
369 *
370 * Enables the software interrupt for a specific ring (all asics).
371 * The software interrupt is generally used to signal a fence on
372 * a particular ring.
373 */
374bool radeon_irq_kms_sw_irq_get_delayed(struct radeon_device *rdev, int ring)
375{
376	return atomic_inc_return(&rdev->irq.ring_int[ring]) == 1;
377}
378
379/**
380 * radeon_irq_kms_sw_irq_put - disable software interrupt
381 *
382 * @rdev: radeon device pointer
383 * @ring: ring whose interrupt you want to disable
384 *
385 * Disables the software interrupt for a specific ring (all asics).
386 * The software interrupt is generally used to signal a fence on
387 * a particular ring.
388 */
389void radeon_irq_kms_sw_irq_put(struct radeon_device *rdev, int ring)
390{
391	unsigned long irqflags;
392
393	if (!rdev->ddev->irq_enabled)
394		return;
395
396	if (atomic_dec_and_test(&rdev->irq.ring_int[ring])) {
397		spin_lock_irqsave(&rdev->irq.lock, irqflags);
398		radeon_irq_set(rdev);
399		spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
400	}
401}
402
403/**
404 * radeon_irq_kms_pflip_irq_get - enable pageflip interrupt
405 *
406 * @rdev: radeon device pointer
407 * @crtc: crtc whose interrupt you want to enable
408 *
409 * Enables the pageflip interrupt for a specific crtc (all asics).
410 * For pageflips we use the vblank interrupt source.
411 */
412void radeon_irq_kms_pflip_irq_get(struct radeon_device *rdev, int crtc)
413{
414	unsigned long irqflags;
415
416	if (crtc < 0 || crtc >= rdev->num_crtc)
417		return;
418
419	if (!rdev->ddev->irq_enabled)
420		return;
421
422	if (atomic_inc_return(&rdev->irq.pflip[crtc]) == 1) {
423		spin_lock_irqsave(&rdev->irq.lock, irqflags);
424		radeon_irq_set(rdev);
425		spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
426	}
427}
428
429/**
430 * radeon_irq_kms_pflip_irq_put - disable pageflip interrupt
431 *
432 * @rdev: radeon device pointer
433 * @crtc: crtc whose interrupt you want to disable
434 *
435 * Disables the pageflip interrupt for a specific crtc (all asics).
436 * For pageflips we use the vblank interrupt source.
437 */
438void radeon_irq_kms_pflip_irq_put(struct radeon_device *rdev, int crtc)
439{
440	unsigned long irqflags;
441
442	if (crtc < 0 || crtc >= rdev->num_crtc)
443		return;
444
445	if (!rdev->ddev->irq_enabled)
446		return;
447
448	if (atomic_dec_and_test(&rdev->irq.pflip[crtc])) {
449		spin_lock_irqsave(&rdev->irq.lock, irqflags);
450		radeon_irq_set(rdev);
451		spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
452	}
453}
454
455/**
456 * radeon_irq_kms_enable_afmt - enable audio format change interrupt
457 *
458 * @rdev: radeon device pointer
459 * @block: afmt block whose interrupt you want to enable
460 *
461 * Enables the afmt change interrupt for a specific afmt block (all asics).
462 */
463void radeon_irq_kms_enable_afmt(struct radeon_device *rdev, int block)
464{
465	unsigned long irqflags;
466
467	if (!rdev->ddev->irq_enabled)
468		return;
469
470	spin_lock_irqsave(&rdev->irq.lock, irqflags);
471	rdev->irq.afmt[block] = true;
472	radeon_irq_set(rdev);
473	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
474
475}
476
477/**
478 * radeon_irq_kms_disable_afmt - disable audio format change interrupt
479 *
480 * @rdev: radeon device pointer
481 * @block: afmt block whose interrupt you want to disable
482 *
483 * Disables the afmt change interrupt for a specific afmt block (all asics).
484 */
485void radeon_irq_kms_disable_afmt(struct radeon_device *rdev, int block)
486{
487	unsigned long irqflags;
488
489	if (!rdev->ddev->irq_enabled)
490		return;
491
492	spin_lock_irqsave(&rdev->irq.lock, irqflags);
493	rdev->irq.afmt[block] = false;
494	radeon_irq_set(rdev);
495	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
496}
497
498/**
499 * radeon_irq_kms_enable_hpd - enable hotplug detect interrupt
500 *
501 * @rdev: radeon device pointer
502 * @hpd_mask: mask of hpd pins you want to enable.
503 *
504 * Enables the hotplug detect interrupt for a specific hpd pin (all asics).
505 */
506void radeon_irq_kms_enable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
507{
508	unsigned long irqflags;
509	int i;
510
511	if (!rdev->ddev->irq_enabled)
512		return;
513
514	spin_lock_irqsave(&rdev->irq.lock, irqflags);
515	for (i = 0; i < RADEON_MAX_HPD_PINS; ++i)
516		rdev->irq.hpd[i] |= !!(hpd_mask & (1 << i));
517	radeon_irq_set(rdev);
518	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
519}
520
521/**
522 * radeon_irq_kms_disable_hpd - disable hotplug detect interrupt
523 *
524 * @rdev: radeon device pointer
525 * @hpd_mask: mask of hpd pins you want to disable.
526 *
527 * Disables the hotplug detect interrupt for a specific hpd pin (all asics).
528 */
529void radeon_irq_kms_disable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
530{
531	unsigned long irqflags;
532	int i;
533
534	if (!rdev->ddev->irq_enabled)
535		return;
536
537	spin_lock_irqsave(&rdev->irq.lock, irqflags);
538	for (i = 0; i < RADEON_MAX_HPD_PINS; ++i)
539		rdev->irq.hpd[i] &= !(hpd_mask & (1 << i));
540	radeon_irq_set(rdev);
541	spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
542}
543
544