tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/* via_irq.c
2 *
3 * Copyright 2004 BEAM Ltd.
4 * Copyright 2002 Tungsten Graphics, Inc.
5 * Copyright 2005 Thomas Hellstrom.
6 * All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the next
16 * paragraph) shall be included in all copies or substantial portions of the
17 * Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * BEAM LTD, TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR
24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
26 * DEALINGS IN THE SOFTWARE.
27 *
28 * Authors:
29 * Terry Barnaby <terry1@beam.ltd.uk>
30 * Keith Whitwell <keith@tungstengraphics.com>
31 * Thomas Hellstrom <unichrome@shipmail.org>
32 *
33 * This code provides standard DRM access to the Via Unichrome / Pro Vertical blank
34 * interrupt, as well as an infrastructure to handle other interrupts of the chip.
35 * The refresh rate is also calculated for video playback sync purposes.
36 */
37
38#include <drm/drmP.h>
39#include <drm/via_drm.h>
40#include "via_drv.h"
41
42#define VIA_REG_INTERRUPT 0x200
43
44/* VIA_REG_INTERRUPT */
45#define VIA_IRQ_GLOBAL (1 << 31)
46#define VIA_IRQ_VBLANK_ENABLE (1 << 19)
47#define VIA_IRQ_VBLANK_PENDING (1 << 3)
48#define VIA_IRQ_HQV0_ENABLE (1 << 11)
49#define VIA_IRQ_HQV1_ENABLE (1 << 25)
50#define VIA_IRQ_HQV0_PENDING (1 << 9)
51#define VIA_IRQ_HQV1_PENDING (1 << 10)
52#define VIA_IRQ_DMA0_DD_ENABLE (1 << 20)
53#define VIA_IRQ_DMA0_TD_ENABLE (1 << 21)
54#define VIA_IRQ_DMA1_DD_ENABLE (1 << 22)
55#define VIA_IRQ_DMA1_TD_ENABLE (1 << 23)
56#define VIA_IRQ_DMA0_DD_PENDING (1 << 4)
57#define VIA_IRQ_DMA0_TD_PENDING (1 << 5)
58#define VIA_IRQ_DMA1_DD_PENDING (1 << 6)
59#define VIA_IRQ_DMA1_TD_PENDING (1 << 7)
60
61
62/*
63 * Device-specific IRQs go here. This type might need to be extended with
64 * the register if there are multiple IRQ control registers.
65 * Currently we activate the HQV interrupts of Unichrome Pro group A.
66 */
67
68static maskarray_t via_pro_group_a_irqs[] = {
69 {VIA_IRQ_HQV0_ENABLE, VIA_IRQ_HQV0_PENDING, 0x000003D0, 0x00008010,
70 0x00000000 },
71 {VIA_IRQ_HQV1_ENABLE, VIA_IRQ_HQV1_PENDING, 0x000013D0, 0x00008010,
72 0x00000000 },
73 {VIA_IRQ_DMA0_TD_ENABLE, VIA_IRQ_DMA0_TD_PENDING, VIA_PCI_DMA_CSR0,
74 VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008},
75 {VIA_IRQ_DMA1_TD_ENABLE, VIA_IRQ_DMA1_TD_PENDING, VIA_PCI_DMA_CSR1,
76 VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008},
77};
78static int via_num_pro_group_a = ARRAY_SIZE(via_pro_group_a_irqs);
79static int via_irqmap_pro_group_a[] = {0, 1, -1, 2, -1, 3};
80
81static maskarray_t via_unichrome_irqs[] = {
82 {VIA_IRQ_DMA0_TD_ENABLE, VIA_IRQ_DMA0_TD_PENDING, VIA_PCI_DMA_CSR0,
83 VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008},
84 {VIA_IRQ_DMA1_TD_ENABLE, VIA_IRQ_DMA1_TD_PENDING, VIA_PCI_DMA_CSR1,
85 VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008}
86};
87static int via_num_unichrome = ARRAY_SIZE(via_unichrome_irqs);
88static int via_irqmap_unichrome[] = {-1, -1, -1, 0, -1, 1};
89
90
91u32 via_get_vblank_counter(struct drm_device *dev, unsigned int pipe)
92{
93 drm_via_private_t *dev_priv = dev->dev_private;
94
95 if (pipe != 0)
96 return 0;
97
98 return atomic_read(&dev_priv->vbl_received);
99}
100
101irqreturn_t via_driver_irq_handler(int irq, void *arg)
102{
103 struct drm_device *dev = (struct drm_device *) arg;
104 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
105 u32 status;
106 int handled = 0;
107 ktime_t cur_vblank;
108 drm_via_irq_t *cur_irq = dev_priv->via_irqs;
109 int i;
110
111 status = VIA_READ(VIA_REG_INTERRUPT);
112 if (status & VIA_IRQ_VBLANK_PENDING) {
113 atomic_inc(&dev_priv->vbl_received);
114 if (!(atomic_read(&dev_priv->vbl_received) & 0x0F)) {
115 cur_vblank = ktime_get();
116 if (dev_priv->last_vblank_valid) {
117 dev_priv->nsec_per_vblank =
118 ktime_sub(cur_vblank,
119 dev_priv->last_vblank) >> 4;
120 }
121 dev_priv->last_vblank = cur_vblank;
122 dev_priv->last_vblank_valid = 1;
123 }
124 if (!(atomic_read(&dev_priv->vbl_received) & 0xFF)) {
125 DRM_DEBUG("nsec per vblank is: %llu\n",
126 ktime_to_ns(dev_priv->nsec_per_vblank));
127 }
128 drm_handle_vblank(dev, 0);
129 handled = 1;
130 }
131
132 for (i = 0; i < dev_priv->num_irqs; ++i) {
133 if (status & cur_irq->pending_mask) {
134 atomic_inc(&cur_irq->irq_received);
135 wake_up(&cur_irq->irq_queue);
136 handled = 1;
137 if (dev_priv->irq_map[drm_via_irq_dma0_td] == i)
138 via_dmablit_handler(dev, 0, 1);
139 else if (dev_priv->irq_map[drm_via_irq_dma1_td] == i)
140 via_dmablit_handler(dev, 1, 1);
141 }
142 cur_irq++;
143 }
144
145 /* Acknowledge interrupts */
146 VIA_WRITE(VIA_REG_INTERRUPT, status);
147
148
149 if (handled)
150 return IRQ_HANDLED;
151 else
152 return IRQ_NONE;
153}
154
155static __inline__ void viadrv_acknowledge_irqs(drm_via_private_t *dev_priv)
156{
157 u32 status;
158
159 if (dev_priv) {
160 /* Acknowledge interrupts */
161 status = VIA_READ(VIA_REG_INTERRUPT);
162 VIA_WRITE(VIA_REG_INTERRUPT, status |
163 dev_priv->irq_pending_mask);
164 }
165}
166
167int via_enable_vblank(struct drm_device *dev, unsigned int pipe)
168{
169 drm_via_private_t *dev_priv = dev->dev_private;
170 u32 status;
171
172 if (pipe != 0) {
173 DRM_ERROR("%s: bad crtc %u\n", __func__, pipe);
174 return -EINVAL;
175 }
176
177 status = VIA_READ(VIA_REG_INTERRUPT);
178 VIA_WRITE(VIA_REG_INTERRUPT, status | VIA_IRQ_VBLANK_ENABLE);
179
180 VIA_WRITE8(0x83d4, 0x11);
181 VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) | 0x30);
182
183 return 0;
184}
185
186void via_disable_vblank(struct drm_device *dev, unsigned int pipe)
187{
188 drm_via_private_t *dev_priv = dev->dev_private;
189 u32 status;
190
191 status = VIA_READ(VIA_REG_INTERRUPT);
192 VIA_WRITE(VIA_REG_INTERRUPT, status & ~VIA_IRQ_VBLANK_ENABLE);
193
194 VIA_WRITE8(0x83d4, 0x11);
195 VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) & ~0x30);
196
197 if (pipe != 0)
198 DRM_ERROR("%s: bad crtc %u\n", __func__, pipe);
199}
200
201static int
202via_driver_irq_wait(struct drm_device *dev, unsigned int irq, int force_sequence,
203 unsigned int *sequence)
204{
205 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
206 unsigned int cur_irq_sequence;
207 drm_via_irq_t *cur_irq;
208 int ret = 0;
209 maskarray_t *masks;
210 int real_irq;
211
212 DRM_DEBUG("\n");
213
214 if (!dev_priv) {
215 DRM_ERROR("called with no initialization\n");
216 return -EINVAL;
217 }
218
219 if (irq >= drm_via_irq_num) {
220 DRM_ERROR("Trying to wait on unknown irq %d\n", irq);
221 return -EINVAL;
222 }
223
224 real_irq = dev_priv->irq_map[irq];
225
226 if (real_irq < 0) {
227 DRM_ERROR("Video IRQ %d not available on this hardware.\n",
228 irq);
229 return -EINVAL;
230 }
231
232 masks = dev_priv->irq_masks;
233 cur_irq = dev_priv->via_irqs + real_irq;
234
235 if (masks[real_irq][2] && !force_sequence) {
236 DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * HZ,
237 ((VIA_READ(masks[irq][2]) & masks[irq][3]) ==
238 masks[irq][4]));
239 cur_irq_sequence = atomic_read(&cur_irq->irq_received);
240 } else {
241 DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * HZ,
242 (((cur_irq_sequence =
243 atomic_read(&cur_irq->irq_received)) -
244 *sequence) <= (1 << 23)));
245 }
246 *sequence = cur_irq_sequence;
247 return ret;
248}
249
250
251/*
252 * drm_dma.h hooks
253 */
254
255void via_driver_irq_preinstall(struct drm_device *dev)
256{
257 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
258 u32 status;
259 drm_via_irq_t *cur_irq;
260 int i;
261
262 DRM_DEBUG("dev_priv: %p\n", dev_priv);
263 if (dev_priv) {
264 cur_irq = dev_priv->via_irqs;
265
266 dev_priv->irq_enable_mask = VIA_IRQ_VBLANK_ENABLE;
267 dev_priv->irq_pending_mask = VIA_IRQ_VBLANK_PENDING;
268
269 if (dev_priv->chipset == VIA_PRO_GROUP_A ||
270 dev_priv->chipset == VIA_DX9_0) {
271 dev_priv->irq_masks = via_pro_group_a_irqs;
272 dev_priv->num_irqs = via_num_pro_group_a;
273 dev_priv->irq_map = via_irqmap_pro_group_a;
274 } else {
275 dev_priv->irq_masks = via_unichrome_irqs;
276 dev_priv->num_irqs = via_num_unichrome;
277 dev_priv->irq_map = via_irqmap_unichrome;
278 }
279
280 for (i = 0; i < dev_priv->num_irqs; ++i) {
281 atomic_set(&cur_irq->irq_received, 0);
282 cur_irq->enable_mask = dev_priv->irq_masks[i][0];
283 cur_irq->pending_mask = dev_priv->irq_masks[i][1];
284 init_waitqueue_head(&cur_irq->irq_queue);
285 dev_priv->irq_enable_mask |= cur_irq->enable_mask;
286 dev_priv->irq_pending_mask |= cur_irq->pending_mask;
287 cur_irq++;
288
289 DRM_DEBUG("Initializing IRQ %d\n", i);
290 }
291
292 dev_priv->last_vblank_valid = 0;
293
294 /* Clear VSync interrupt regs */
295 status = VIA_READ(VIA_REG_INTERRUPT);
296 VIA_WRITE(VIA_REG_INTERRUPT, status &
297 ~(dev_priv->irq_enable_mask));
298
299 /* Clear bits if they're already high */
300 viadrv_acknowledge_irqs(dev_priv);
301 }
302}
303
304int via_driver_irq_postinstall(struct drm_device *dev)
305{
306 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
307 u32 status;
308
309 DRM_DEBUG("via_driver_irq_postinstall\n");
310 if (!dev_priv)
311 return -EINVAL;
312
313 status = VIA_READ(VIA_REG_INTERRUPT);
314 VIA_WRITE(VIA_REG_INTERRUPT, status | VIA_IRQ_GLOBAL
315 | dev_priv->irq_enable_mask);
316
317 /* Some magic, oh for some data sheets ! */
318 VIA_WRITE8(0x83d4, 0x11);
319 VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) | 0x30);
320
321 return 0;
322}
323
324void via_driver_irq_uninstall(struct drm_device *dev)
325{
326 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
327 u32 status;
328
329 DRM_DEBUG("\n");
330 if (dev_priv) {
331
332 /* Some more magic, oh for some data sheets ! */
333
334 VIA_WRITE8(0x83d4, 0x11);
335 VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) & ~0x30);
336
337 status = VIA_READ(VIA_REG_INTERRUPT);
338 VIA_WRITE(VIA_REG_INTERRUPT, status &
339 ~(VIA_IRQ_VBLANK_ENABLE | dev_priv->irq_enable_mask));
340 }
341}
342
343int via_wait_irq(struct drm_device *dev, void *data, struct drm_file *file_priv)
344{
345 drm_via_irqwait_t *irqwait = data;
346 struct timespec64 now;
347 int ret = 0;
348 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
349 drm_via_irq_t *cur_irq = dev_priv->via_irqs;
350 int force_sequence;
351
352 if (irqwait->request.irq >= dev_priv->num_irqs) {
353 DRM_ERROR("Trying to wait on unknown irq %d\n",
354 irqwait->request.irq);
355 return -EINVAL;
356 }
357
358 cur_irq += irqwait->request.irq;
359
360 switch (irqwait->request.type & ~VIA_IRQ_FLAGS_MASK) {
361 case VIA_IRQ_RELATIVE:
362 irqwait->request.sequence +=
363 atomic_read(&cur_irq->irq_received);
364 irqwait->request.type &= ~_DRM_VBLANK_RELATIVE;
365 case VIA_IRQ_ABSOLUTE:
366 break;
367 default:
368 return -EINVAL;
369 }
370
371 if (irqwait->request.type & VIA_IRQ_SIGNAL) {
372 DRM_ERROR("Signals on Via IRQs not implemented yet.\n");
373 return -EINVAL;
374 }
375
376 force_sequence = (irqwait->request.type & VIA_IRQ_FORCE_SEQUENCE);
377
378 ret = via_driver_irq_wait(dev, irqwait->request.irq, force_sequence,
379 &irqwait->request.sequence);
380 ktime_get_ts64(&now);
381 irqwait->reply.tval_sec = now.tv_sec;
382 irqwait->reply.tval_usec = now.tv_nsec / NSEC_PER_USEC;
383
384 return ret;
385}