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 "drmP.h"
29 #include "drm_crtc_helper.h"
30 #include "radeon_drm.h"
31 #include "radeon_reg.h"
32 #include "radeon.h"
33 #include "atom.h"
34 
35 irqreturn_t radeon_driver_irq_handler_kms(DRM_IRQ_ARGS)
36 {
37 	struct drm_device *dev = (struct drm_device *) arg;
38 	struct radeon_device *rdev = dev->dev_private;
39 
40 	return radeon_irq_process(rdev);
41 }
42 
43 /*
44  * Handle hotplug events outside the interrupt handler proper.
45  */
46 static void radeon_hotplug_work_func(struct work_struct *work)
47 {
48 	struct radeon_device *rdev = container_of(work, struct radeon_device,
49 						  hotplug_work);
50 	struct drm_device *dev = rdev->ddev;
51 	struct drm_mode_config *mode_config = &dev->mode_config;
52 	struct drm_connector *connector;
53 
54 	if (mode_config->num_connector) {
55 		list_for_each_entry(connector, &mode_config->connector_list, head)
56 			radeon_connector_hotplug(connector);
57 	}
58 	/* Just fire off a uevent and let userspace tell us what to do */
59 	drm_helper_hpd_irq_event(dev);
60 }
61 
62 void radeon_driver_irq_preinstall_kms(struct drm_device *dev)
63 {
64 	struct radeon_device *rdev = dev->dev_private;
65 	unsigned i;
66 
67 	/* Disable *all* interrupts */
68 	rdev->irq.sw_int = false;
69 	rdev->irq.gui_idle = false;
70 	for (i = 0; i < rdev->num_crtc; i++)
71 		rdev->irq.crtc_vblank_int[i] = false;
72 	for (i = 0; i < 6; i++) {
73 		rdev->irq.hpd[i] = false;
74 		rdev->irq.pflip[i] = false;
75 	}
76 	radeon_irq_set(rdev);
77 	/* Clear bits */
78 	radeon_irq_process(rdev);
79 }
80 
81 int radeon_driver_irq_postinstall_kms(struct drm_device *dev)
82 {
83 	struct radeon_device *rdev = dev->dev_private;
84 
85 	dev->max_vblank_count = 0x001fffff;
86 	rdev->irq.sw_int = true;
87 	radeon_irq_set(rdev);
88 	return 0;
89 }
90 
91 void radeon_driver_irq_uninstall_kms(struct drm_device *dev)
92 {
93 	struct radeon_device *rdev = dev->dev_private;
94 	unsigned i;
95 
96 	if (rdev == NULL) {
97 		return;
98 	}
99 	/* Disable *all* interrupts */
100 	rdev->irq.sw_int = false;
101 	rdev->irq.gui_idle = false;
102 	for (i = 0; i < rdev->num_crtc; i++)
103 		rdev->irq.crtc_vblank_int[i] = false;
104 	for (i = 0; i < 6; i++) {
105 		rdev->irq.hpd[i] = false;
106 		rdev->irq.pflip[i] = false;
107 	}
108 	radeon_irq_set(rdev);
109 }
110 
111 int radeon_irq_kms_init(struct radeon_device *rdev)
112 {
113 	int i;
114 	int r = 0;
115 
116 	INIT_WORK(&rdev->hotplug_work, radeon_hotplug_work_func);
117 
118 	spin_lock_init(&rdev->irq.sw_lock);
119 	for (i = 0; i < rdev->num_crtc; i++)
120 		spin_lock_init(&rdev->irq.pflip_lock[i]);
121 	r = drm_vblank_init(rdev->ddev, rdev->num_crtc);
122 	if (r) {
123 		return r;
124 	}
125 	/* enable msi */
126 	rdev->msi_enabled = 0;
127 	/* MSIs don't seem to work reliably on all IGP
128 	 * chips.  Disable MSI on them for now.
129 	 */
130 	if ((rdev->family >= CHIP_RV380) &&
131 	    ((!(rdev->flags & RADEON_IS_IGP)) || (rdev->family >= CHIP_PALM)) &&
132 	    (!(rdev->flags & RADEON_IS_AGP))) {
133 		int ret = pci_enable_msi(rdev->pdev);
134 		if (!ret) {
135 			rdev->msi_enabled = 1;
136 			dev_info(rdev->dev, "radeon: using MSI.\n");
137 		}
138 	}
139 	rdev->irq.installed = true;
140 	r = drm_irq_install(rdev->ddev);
141 	if (r) {
142 		rdev->irq.installed = false;
143 		return r;
144 	}
145 	DRM_INFO("radeon: irq initialized.\n");
146 	return 0;
147 }
148 
149 void radeon_irq_kms_fini(struct radeon_device *rdev)
150 {
151 	drm_vblank_cleanup(rdev->ddev);
152 	if (rdev->irq.installed) {
153 		drm_irq_uninstall(rdev->ddev);
154 		rdev->irq.installed = false;
155 		if (rdev->msi_enabled)
156 			pci_disable_msi(rdev->pdev);
157 	}
158 	flush_work_sync(&rdev->hotplug_work);
159 }
160 
161 void radeon_irq_kms_sw_irq_get(struct radeon_device *rdev)
162 {
163 	unsigned long irqflags;
164 
165 	spin_lock_irqsave(&rdev->irq.sw_lock, irqflags);
166 	if (rdev->ddev->irq_enabled && (++rdev->irq.sw_refcount == 1)) {
167 		rdev->irq.sw_int = true;
168 		radeon_irq_set(rdev);
169 	}
170 	spin_unlock_irqrestore(&rdev->irq.sw_lock, irqflags);
171 }
172 
173 void radeon_irq_kms_sw_irq_put(struct radeon_device *rdev)
174 {
175 	unsigned long irqflags;
176 
177 	spin_lock_irqsave(&rdev->irq.sw_lock, irqflags);
178 	BUG_ON(rdev->ddev->irq_enabled && rdev->irq.sw_refcount <= 0);
179 	if (rdev->ddev->irq_enabled && (--rdev->irq.sw_refcount == 0)) {
180 		rdev->irq.sw_int = false;
181 		radeon_irq_set(rdev);
182 	}
183 	spin_unlock_irqrestore(&rdev->irq.sw_lock, irqflags);
184 }
185 
186 void radeon_irq_kms_pflip_irq_get(struct radeon_device *rdev, int crtc)
187 {
188 	unsigned long irqflags;
189 
190 	if (crtc < 0 || crtc >= rdev->num_crtc)
191 		return;
192 
193 	spin_lock_irqsave(&rdev->irq.pflip_lock[crtc], irqflags);
194 	if (rdev->ddev->irq_enabled && (++rdev->irq.pflip_refcount[crtc] == 1)) {
195 		rdev->irq.pflip[crtc] = true;
196 		radeon_irq_set(rdev);
197 	}
198 	spin_unlock_irqrestore(&rdev->irq.pflip_lock[crtc], irqflags);
199 }
200 
201 void radeon_irq_kms_pflip_irq_put(struct radeon_device *rdev, int crtc)
202 {
203 	unsigned long irqflags;
204 
205 	if (crtc < 0 || crtc >= rdev->num_crtc)
206 		return;
207 
208 	spin_lock_irqsave(&rdev->irq.pflip_lock[crtc], irqflags);
209 	BUG_ON(rdev->ddev->irq_enabled && rdev->irq.pflip_refcount[crtc] <= 0);
210 	if (rdev->ddev->irq_enabled && (--rdev->irq.pflip_refcount[crtc] == 0)) {
211 		rdev->irq.pflip[crtc] = false;
212 		radeon_irq_set(rdev);
213 	}
214 	spin_unlock_irqrestore(&rdev->irq.pflip_lock[crtc], irqflags);
215 }
216 
217