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
68 static 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 };
78 static int via_num_pro_group_a = ARRAY_SIZE(via_pro_group_a_irqs);
79 static int via_irqmap_pro_group_a[] = {0, 1, -1, 2, -1, 3};
80
81 static 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 };
87 static int via_num_unichrome = ARRAY_SIZE(via_unichrome_irqs);
88 static int via_irqmap_unichrome[] = {-1, -1, -1, 0, -1, 1};
89
90
time_diff(struct timeval * now,struct timeval * then)91 static unsigned time_diff(struct timeval *now, struct timeval *then)
92 {
93 return (now->tv_usec >= then->tv_usec) ?
94 now->tv_usec - then->tv_usec :
95 1000000 - (then->tv_usec - now->tv_usec);
96 }
97
via_get_vblank_counter(struct drm_device * dev,int crtc)98 u32 via_get_vblank_counter(struct drm_device *dev, int crtc)
99 {
100 drm_via_private_t *dev_priv = dev->dev_private;
101 if (crtc != 0)
102 return 0;
103
104 return atomic_read(&dev_priv->vbl_received);
105 }
106
via_driver_irq_handler(DRM_IRQ_ARGS)107 irqreturn_t via_driver_irq_handler(DRM_IRQ_ARGS)
108 {
109 struct drm_device *dev = (struct drm_device *) arg;
110 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
111 u32 status;
112 int handled = 0;
113 struct timeval cur_vblank;
114 drm_via_irq_t *cur_irq = dev_priv->via_irqs;
115 int i;
116
117 status = VIA_READ(VIA_REG_INTERRUPT);
118 if (status & VIA_IRQ_VBLANK_PENDING) {
119 atomic_inc(&dev_priv->vbl_received);
120 if (!(atomic_read(&dev_priv->vbl_received) & 0x0F)) {
121 do_gettimeofday(&cur_vblank);
122 if (dev_priv->last_vblank_valid) {
123 dev_priv->usec_per_vblank =
124 time_diff(&cur_vblank,
125 &dev_priv->last_vblank) >> 4;
126 }
127 dev_priv->last_vblank = cur_vblank;
128 dev_priv->last_vblank_valid = 1;
129 }
130 if (!(atomic_read(&dev_priv->vbl_received) & 0xFF)) {
131 DRM_DEBUG("US per vblank is: %u\n",
132 dev_priv->usec_per_vblank);
133 }
134 drm_handle_vblank(dev, 0);
135 handled = 1;
136 }
137
138 for (i = 0; i < dev_priv->num_irqs; ++i) {
139 if (status & cur_irq->pending_mask) {
140 atomic_inc(&cur_irq->irq_received);
141 DRM_WAKEUP(&cur_irq->irq_queue);
142 handled = 1;
143 if (dev_priv->irq_map[drm_via_irq_dma0_td] == i)
144 via_dmablit_handler(dev, 0, 1);
145 else if (dev_priv->irq_map[drm_via_irq_dma1_td] == i)
146 via_dmablit_handler(dev, 1, 1);
147 }
148 cur_irq++;
149 }
150
151 /* Acknowledge interrupts */
152 VIA_WRITE(VIA_REG_INTERRUPT, status);
153
154
155 if (handled)
156 return IRQ_HANDLED;
157 else
158 return IRQ_NONE;
159 }
160
viadrv_acknowledge_irqs(drm_via_private_t * dev_priv)161 static __inline__ void viadrv_acknowledge_irqs(drm_via_private_t *dev_priv)
162 {
163 u32 status;
164
165 if (dev_priv) {
166 /* Acknowledge interrupts */
167 status = VIA_READ(VIA_REG_INTERRUPT);
168 VIA_WRITE(VIA_REG_INTERRUPT, status |
169 dev_priv->irq_pending_mask);
170 }
171 }
172
via_enable_vblank(struct drm_device * dev,int crtc)173 int via_enable_vblank(struct drm_device *dev, int crtc)
174 {
175 drm_via_private_t *dev_priv = dev->dev_private;
176 u32 status;
177
178 if (crtc != 0) {
179 DRM_ERROR("%s: bad crtc %d\n", __func__, crtc);
180 return -EINVAL;
181 }
182
183 status = VIA_READ(VIA_REG_INTERRUPT);
184 VIA_WRITE(VIA_REG_INTERRUPT, status | VIA_IRQ_VBLANK_ENABLE);
185
186 VIA_WRITE8(0x83d4, 0x11);
187 VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) | 0x30);
188
189 return 0;
190 }
191
via_disable_vblank(struct drm_device * dev,int crtc)192 void via_disable_vblank(struct drm_device *dev, int crtc)
193 {
194 drm_via_private_t *dev_priv = dev->dev_private;
195 u32 status;
196
197 status = VIA_READ(VIA_REG_INTERRUPT);
198 VIA_WRITE(VIA_REG_INTERRUPT, status & ~VIA_IRQ_VBLANK_ENABLE);
199
200 VIA_WRITE8(0x83d4, 0x11);
201 VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) & ~0x30);
202
203 if (crtc != 0)
204 DRM_ERROR("%s: bad crtc %d\n", __func__, crtc);
205 }
206
207 static int
via_driver_irq_wait(struct drm_device * dev,unsigned int irq,int force_sequence,unsigned int * sequence)208 via_driver_irq_wait(struct drm_device *dev, unsigned int irq, int force_sequence,
209 unsigned int *sequence)
210 {
211 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
212 unsigned int cur_irq_sequence;
213 drm_via_irq_t *cur_irq;
214 int ret = 0;
215 maskarray_t *masks;
216 int real_irq;
217
218 DRM_DEBUG("\n");
219
220 if (!dev_priv) {
221 DRM_ERROR("called with no initialization\n");
222 return -EINVAL;
223 }
224
225 if (irq >= drm_via_irq_num) {
226 DRM_ERROR("Trying to wait on unknown irq %d\n", irq);
227 return -EINVAL;
228 }
229
230 real_irq = dev_priv->irq_map[irq];
231
232 if (real_irq < 0) {
233 DRM_ERROR("Video IRQ %d not available on this hardware.\n",
234 irq);
235 return -EINVAL;
236 }
237
238 masks = dev_priv->irq_masks;
239 cur_irq = dev_priv->via_irqs + real_irq;
240
241 if (masks[real_irq][2] && !force_sequence) {
242 DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * DRM_HZ,
243 ((VIA_READ(masks[irq][2]) & masks[irq][3]) ==
244 masks[irq][4]));
245 cur_irq_sequence = atomic_read(&cur_irq->irq_received);
246 } else {
247 DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * DRM_HZ,
248 (((cur_irq_sequence =
249 atomic_read(&cur_irq->irq_received)) -
250 *sequence) <= (1 << 23)));
251 }
252 *sequence = cur_irq_sequence;
253 return ret;
254 }
255
256
257 /*
258 * drm_dma.h hooks
259 */
260
via_driver_irq_preinstall(struct drm_device * dev)261 void via_driver_irq_preinstall(struct drm_device *dev)
262 {
263 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
264 u32 status;
265 drm_via_irq_t *cur_irq;
266 int i;
267
268 DRM_DEBUG("dev_priv: %p\n", dev_priv);
269 if (dev_priv) {
270 cur_irq = dev_priv->via_irqs;
271
272 dev_priv->irq_enable_mask = VIA_IRQ_VBLANK_ENABLE;
273 dev_priv->irq_pending_mask = VIA_IRQ_VBLANK_PENDING;
274
275 if (dev_priv->chipset == VIA_PRO_GROUP_A ||
276 dev_priv->chipset == VIA_DX9_0) {
277 dev_priv->irq_masks = via_pro_group_a_irqs;
278 dev_priv->num_irqs = via_num_pro_group_a;
279 dev_priv->irq_map = via_irqmap_pro_group_a;
280 } else {
281 dev_priv->irq_masks = via_unichrome_irqs;
282 dev_priv->num_irqs = via_num_unichrome;
283 dev_priv->irq_map = via_irqmap_unichrome;
284 }
285
286 for (i = 0; i < dev_priv->num_irqs; ++i) {
287 atomic_set(&cur_irq->irq_received, 0);
288 cur_irq->enable_mask = dev_priv->irq_masks[i][0];
289 cur_irq->pending_mask = dev_priv->irq_masks[i][1];
290 DRM_INIT_WAITQUEUE(&cur_irq->irq_queue);
291 dev_priv->irq_enable_mask |= cur_irq->enable_mask;
292 dev_priv->irq_pending_mask |= cur_irq->pending_mask;
293 cur_irq++;
294
295 DRM_DEBUG("Initializing IRQ %d\n", i);
296 }
297
298 dev_priv->last_vblank_valid = 0;
299
300 /* Clear VSync interrupt regs */
301 status = VIA_READ(VIA_REG_INTERRUPT);
302 VIA_WRITE(VIA_REG_INTERRUPT, status &
303 ~(dev_priv->irq_enable_mask));
304
305 /* Clear bits if they're already high */
306 viadrv_acknowledge_irqs(dev_priv);
307 }
308 }
309
via_driver_irq_postinstall(struct drm_device * dev)310 int via_driver_irq_postinstall(struct drm_device *dev)
311 {
312 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
313 u32 status;
314
315 DRM_DEBUG("via_driver_irq_postinstall\n");
316 if (!dev_priv)
317 return -EINVAL;
318
319 status = VIA_READ(VIA_REG_INTERRUPT);
320 VIA_WRITE(VIA_REG_INTERRUPT, status | VIA_IRQ_GLOBAL
321 | dev_priv->irq_enable_mask);
322
323 /* Some magic, oh for some data sheets ! */
324 VIA_WRITE8(0x83d4, 0x11);
325 VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) | 0x30);
326
327 return 0;
328 }
329
via_driver_irq_uninstall(struct drm_device * dev)330 void via_driver_irq_uninstall(struct drm_device *dev)
331 {
332 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
333 u32 status;
334
335 DRM_DEBUG("\n");
336 if (dev_priv) {
337
338 /* Some more magic, oh for some data sheets ! */
339
340 VIA_WRITE8(0x83d4, 0x11);
341 VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) & ~0x30);
342
343 status = VIA_READ(VIA_REG_INTERRUPT);
344 VIA_WRITE(VIA_REG_INTERRUPT, status &
345 ~(VIA_IRQ_VBLANK_ENABLE | dev_priv->irq_enable_mask));
346 }
347 }
348
via_wait_irq(struct drm_device * dev,void * data,struct drm_file * file_priv)349 int via_wait_irq(struct drm_device *dev, void *data, struct drm_file *file_priv)
350 {
351 drm_via_irqwait_t *irqwait = data;
352 struct timeval now;
353 int ret = 0;
354 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
355 drm_via_irq_t *cur_irq = dev_priv->via_irqs;
356 int force_sequence;
357
358 if (irqwait->request.irq >= dev_priv->num_irqs) {
359 DRM_ERROR("Trying to wait on unknown irq %d\n",
360 irqwait->request.irq);
361 return -EINVAL;
362 }
363
364 cur_irq += irqwait->request.irq;
365
366 switch (irqwait->request.type & ~VIA_IRQ_FLAGS_MASK) {
367 case VIA_IRQ_RELATIVE:
368 irqwait->request.sequence +=
369 atomic_read(&cur_irq->irq_received);
370 irqwait->request.type &= ~_DRM_VBLANK_RELATIVE;
371 case VIA_IRQ_ABSOLUTE:
372 break;
373 default:
374 return -EINVAL;
375 }
376
377 if (irqwait->request.type & VIA_IRQ_SIGNAL) {
378 DRM_ERROR("Signals on Via IRQs not implemented yet.\n");
379 return -EINVAL;
380 }
381
382 force_sequence = (irqwait->request.type & VIA_IRQ_FORCE_SEQUENCE);
383
384 ret = via_driver_irq_wait(dev, irqwait->request.irq, force_sequence,
385 &irqwait->request.sequence);
386 do_gettimeofday(&now);
387 irqwait->reply.tval_sec = now.tv_sec;
388 irqwait->reply.tval_usec = now.tv_usec;
389
390 return ret;
391 }
392