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/drm_device.h>
39 #include <drm/drm_vblank.h>
40 #include <drm/via_drm.h>
41
42 #include "via_drv.h"
43
44 #define VIA_REG_INTERRUPT 0x200
45
46 /* VIA_REG_INTERRUPT */
47 #define VIA_IRQ_GLOBAL (1 << 31)
48 #define VIA_IRQ_VBLANK_ENABLE (1 << 19)
49 #define VIA_IRQ_VBLANK_PENDING (1 << 3)
50 #define VIA_IRQ_HQV0_ENABLE (1 << 11)
51 #define VIA_IRQ_HQV1_ENABLE (1 << 25)
52 #define VIA_IRQ_HQV0_PENDING (1 << 9)
53 #define VIA_IRQ_HQV1_PENDING (1 << 10)
54 #define VIA_IRQ_DMA0_DD_ENABLE (1 << 20)
55 #define VIA_IRQ_DMA0_TD_ENABLE (1 << 21)
56 #define VIA_IRQ_DMA1_DD_ENABLE (1 << 22)
57 #define VIA_IRQ_DMA1_TD_ENABLE (1 << 23)
58 #define VIA_IRQ_DMA0_DD_PENDING (1 << 4)
59 #define VIA_IRQ_DMA0_TD_PENDING (1 << 5)
60 #define VIA_IRQ_DMA1_DD_PENDING (1 << 6)
61 #define VIA_IRQ_DMA1_TD_PENDING (1 << 7)
62
63
64 /*
65 * Device-specific IRQs go here. This type might need to be extended with
66 * the register if there are multiple IRQ control registers.
67 * Currently we activate the HQV interrupts of Unichrome Pro group A.
68 */
69
70 static maskarray_t via_pro_group_a_irqs[] = {
71 {VIA_IRQ_HQV0_ENABLE, VIA_IRQ_HQV0_PENDING, 0x000003D0, 0x00008010,
72 0x00000000 },
73 {VIA_IRQ_HQV1_ENABLE, VIA_IRQ_HQV1_PENDING, 0x000013D0, 0x00008010,
74 0x00000000 },
75 {VIA_IRQ_DMA0_TD_ENABLE, VIA_IRQ_DMA0_TD_PENDING, VIA_PCI_DMA_CSR0,
76 VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008},
77 {VIA_IRQ_DMA1_TD_ENABLE, VIA_IRQ_DMA1_TD_PENDING, VIA_PCI_DMA_CSR1,
78 VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008},
79 };
80 static int via_num_pro_group_a = ARRAY_SIZE(via_pro_group_a_irqs);
81 static int via_irqmap_pro_group_a[] = {0, 1, -1, 2, -1, 3};
82
83 static maskarray_t via_unichrome_irqs[] = {
84 {VIA_IRQ_DMA0_TD_ENABLE, VIA_IRQ_DMA0_TD_PENDING, VIA_PCI_DMA_CSR0,
85 VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008},
86 {VIA_IRQ_DMA1_TD_ENABLE, VIA_IRQ_DMA1_TD_PENDING, VIA_PCI_DMA_CSR1,
87 VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008}
88 };
89 static int via_num_unichrome = ARRAY_SIZE(via_unichrome_irqs);
90 static int via_irqmap_unichrome[] = {-1, -1, -1, 0, -1, 1};
91
92
via_get_vblank_counter(struct drm_device * dev,unsigned int pipe)93 u32 via_get_vblank_counter(struct drm_device *dev, unsigned int pipe)
94 {
95 drm_via_private_t *dev_priv = dev->dev_private;
96
97 if (pipe != 0)
98 return 0;
99
100 return atomic_read(&dev_priv->vbl_received);
101 }
102
via_driver_irq_handler(int irq,void * arg)103 irqreturn_t via_driver_irq_handler(int irq, void *arg)
104 {
105 struct drm_device *dev = (struct drm_device *) arg;
106 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
107 u32 status;
108 int handled = 0;
109 ktime_t cur_vblank;
110 drm_via_irq_t *cur_irq = dev_priv->via_irqs;
111 int i;
112
113 status = via_read(dev_priv, VIA_REG_INTERRUPT);
114 if (status & VIA_IRQ_VBLANK_PENDING) {
115 atomic_inc(&dev_priv->vbl_received);
116 if (!(atomic_read(&dev_priv->vbl_received) & 0x0F)) {
117 cur_vblank = ktime_get();
118 if (dev_priv->last_vblank_valid) {
119 dev_priv->nsec_per_vblank =
120 ktime_sub(cur_vblank,
121 dev_priv->last_vblank) >> 4;
122 }
123 dev_priv->last_vblank = cur_vblank;
124 dev_priv->last_vblank_valid = 1;
125 }
126 if (!(atomic_read(&dev_priv->vbl_received) & 0xFF)) {
127 DRM_DEBUG("nsec per vblank is: %llu\n",
128 ktime_to_ns(dev_priv->nsec_per_vblank));
129 }
130 drm_handle_vblank(dev, 0);
131 handled = 1;
132 }
133
134 for (i = 0; i < dev_priv->num_irqs; ++i) {
135 if (status & cur_irq->pending_mask) {
136 atomic_inc(&cur_irq->irq_received);
137 wake_up(&cur_irq->irq_queue);
138 handled = 1;
139 if (dev_priv->irq_map[drm_via_irq_dma0_td] == i)
140 via_dmablit_handler(dev, 0, 1);
141 else if (dev_priv->irq_map[drm_via_irq_dma1_td] == i)
142 via_dmablit_handler(dev, 1, 1);
143 }
144 cur_irq++;
145 }
146
147 /* Acknowledge interrupts */
148 via_write(dev_priv, VIA_REG_INTERRUPT, status);
149
150
151 if (handled)
152 return IRQ_HANDLED;
153 else
154 return IRQ_NONE;
155 }
156
viadrv_acknowledge_irqs(drm_via_private_t * dev_priv)157 static __inline__ void viadrv_acknowledge_irqs(drm_via_private_t *dev_priv)
158 {
159 u32 status;
160
161 if (dev_priv) {
162 /* Acknowledge interrupts */
163 status = via_read(dev_priv, VIA_REG_INTERRUPT);
164 via_write(dev_priv, VIA_REG_INTERRUPT, status |
165 dev_priv->irq_pending_mask);
166 }
167 }
168
via_enable_vblank(struct drm_device * dev,unsigned int pipe)169 int via_enable_vblank(struct drm_device *dev, unsigned int pipe)
170 {
171 drm_via_private_t *dev_priv = dev->dev_private;
172 u32 status;
173
174 if (pipe != 0) {
175 DRM_ERROR("%s: bad crtc %u\n", __func__, pipe);
176 return -EINVAL;
177 }
178
179 status = via_read(dev_priv, VIA_REG_INTERRUPT);
180 via_write(dev_priv, VIA_REG_INTERRUPT, status | VIA_IRQ_VBLANK_ENABLE);
181
182 via_write8(dev_priv, 0x83d4, 0x11);
183 via_write8_mask(dev_priv, 0x83d5, 0x30, 0x30);
184
185 return 0;
186 }
187
via_disable_vblank(struct drm_device * dev,unsigned int pipe)188 void via_disable_vblank(struct drm_device *dev, unsigned int pipe)
189 {
190 drm_via_private_t *dev_priv = dev->dev_private;
191 u32 status;
192
193 status = via_read(dev_priv, VIA_REG_INTERRUPT);
194 via_write(dev_priv, VIA_REG_INTERRUPT, status & ~VIA_IRQ_VBLANK_ENABLE);
195
196 via_write8(dev_priv, 0x83d4, 0x11);
197 via_write8_mask(dev_priv, 0x83d5, 0x30, 0);
198
199 if (pipe != 0)
200 DRM_ERROR("%s: bad crtc %u\n", __func__, pipe);
201 }
202
203 static int
via_driver_irq_wait(struct drm_device * dev,unsigned int irq,int force_sequence,unsigned int * sequence)204 via_driver_irq_wait(struct drm_device *dev, unsigned int irq, int force_sequence,
205 unsigned int *sequence)
206 {
207 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
208 unsigned int cur_irq_sequence;
209 drm_via_irq_t *cur_irq;
210 int ret = 0;
211 maskarray_t *masks;
212 int real_irq;
213
214 DRM_DEBUG("\n");
215
216 if (!dev_priv) {
217 DRM_ERROR("called with no initialization\n");
218 return -EINVAL;
219 }
220
221 if (irq >= drm_via_irq_num) {
222 DRM_ERROR("Trying to wait on unknown irq %d\n", irq);
223 return -EINVAL;
224 }
225
226 real_irq = dev_priv->irq_map[irq];
227
228 if (real_irq < 0) {
229 DRM_ERROR("Video IRQ %d not available on this hardware.\n",
230 irq);
231 return -EINVAL;
232 }
233
234 masks = dev_priv->irq_masks;
235 cur_irq = dev_priv->via_irqs + real_irq;
236
237 if (masks[real_irq][2] && !force_sequence) {
238 VIA_WAIT_ON(ret, cur_irq->irq_queue, 3 * HZ,
239 ((via_read(dev_priv, masks[irq][2]) & masks[irq][3]) ==
240 masks[irq][4]));
241 cur_irq_sequence = atomic_read(&cur_irq->irq_received);
242 } else {
243 VIA_WAIT_ON(ret, cur_irq->irq_queue, 3 * HZ,
244 (((cur_irq_sequence =
245 atomic_read(&cur_irq->irq_received)) -
246 *sequence) <= (1 << 23)));
247 }
248 *sequence = cur_irq_sequence;
249 return ret;
250 }
251
252
253 /*
254 * drm_dma.h hooks
255 */
256
via_driver_irq_preinstall(struct drm_device * dev)257 void via_driver_irq_preinstall(struct drm_device *dev)
258 {
259 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
260 u32 status;
261 drm_via_irq_t *cur_irq;
262 int i;
263
264 DRM_DEBUG("dev_priv: %p\n", dev_priv);
265 if (dev_priv) {
266 cur_irq = dev_priv->via_irqs;
267
268 dev_priv->irq_enable_mask = VIA_IRQ_VBLANK_ENABLE;
269 dev_priv->irq_pending_mask = VIA_IRQ_VBLANK_PENDING;
270
271 if (dev_priv->chipset == VIA_PRO_GROUP_A ||
272 dev_priv->chipset == VIA_DX9_0) {
273 dev_priv->irq_masks = via_pro_group_a_irqs;
274 dev_priv->num_irqs = via_num_pro_group_a;
275 dev_priv->irq_map = via_irqmap_pro_group_a;
276 } else {
277 dev_priv->irq_masks = via_unichrome_irqs;
278 dev_priv->num_irqs = via_num_unichrome;
279 dev_priv->irq_map = via_irqmap_unichrome;
280 }
281
282 for (i = 0; i < dev_priv->num_irqs; ++i) {
283 atomic_set(&cur_irq->irq_received, 0);
284 cur_irq->enable_mask = dev_priv->irq_masks[i][0];
285 cur_irq->pending_mask = dev_priv->irq_masks[i][1];
286 init_waitqueue_head(&cur_irq->irq_queue);
287 dev_priv->irq_enable_mask |= cur_irq->enable_mask;
288 dev_priv->irq_pending_mask |= cur_irq->pending_mask;
289 cur_irq++;
290
291 DRM_DEBUG("Initializing IRQ %d\n", i);
292 }
293
294 dev_priv->last_vblank_valid = 0;
295
296 /* Clear VSync interrupt regs */
297 status = via_read(dev_priv, VIA_REG_INTERRUPT);
298 via_write(dev_priv, VIA_REG_INTERRUPT, status &
299 ~(dev_priv->irq_enable_mask));
300
301 /* Clear bits if they're already high */
302 viadrv_acknowledge_irqs(dev_priv);
303 }
304 }
305
via_driver_irq_postinstall(struct drm_device * dev)306 int via_driver_irq_postinstall(struct drm_device *dev)
307 {
308 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
309 u32 status;
310
311 DRM_DEBUG("fun: %s\n", __func__);
312 if (!dev_priv)
313 return -EINVAL;
314
315 status = via_read(dev_priv, VIA_REG_INTERRUPT);
316 via_write(dev_priv, VIA_REG_INTERRUPT, status | VIA_IRQ_GLOBAL
317 | dev_priv->irq_enable_mask);
318
319 /* Some magic, oh for some data sheets ! */
320 via_write8(dev_priv, 0x83d4, 0x11);
321 via_write8_mask(dev_priv, 0x83d5, 0x30, 0x30);
322
323 return 0;
324 }
325
via_driver_irq_uninstall(struct drm_device * dev)326 void via_driver_irq_uninstall(struct drm_device *dev)
327 {
328 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
329 u32 status;
330
331 DRM_DEBUG("\n");
332 if (dev_priv) {
333
334 /* Some more magic, oh for some data sheets ! */
335
336 via_write8(dev_priv, 0x83d4, 0x11);
337 via_write8_mask(dev_priv, 0x83d5, 0x30, 0);
338
339 status = via_read(dev_priv, VIA_REG_INTERRUPT);
340 via_write(dev_priv, VIA_REG_INTERRUPT, status &
341 ~(VIA_IRQ_VBLANK_ENABLE | dev_priv->irq_enable_mask));
342 }
343 }
344
via_wait_irq(struct drm_device * dev,void * data,struct drm_file * file_priv)345 int via_wait_irq(struct drm_device *dev, void *data, struct drm_file *file_priv)
346 {
347 drm_via_irqwait_t *irqwait = data;
348 struct timespec64 now;
349 int ret = 0;
350 drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
351 drm_via_irq_t *cur_irq = dev_priv->via_irqs;
352 int force_sequence;
353
354 if (irqwait->request.irq >= dev_priv->num_irqs) {
355 DRM_ERROR("Trying to wait on unknown irq %d\n",
356 irqwait->request.irq);
357 return -EINVAL;
358 }
359
360 cur_irq += irqwait->request.irq;
361
362 switch (irqwait->request.type & ~VIA_IRQ_FLAGS_MASK) {
363 case VIA_IRQ_RELATIVE:
364 irqwait->request.sequence +=
365 atomic_read(&cur_irq->irq_received);
366 irqwait->request.type &= ~_DRM_VBLANK_RELATIVE;
367 break;
368 case VIA_IRQ_ABSOLUTE:
369 break;
370 default:
371 return -EINVAL;
372 }
373
374 if (irqwait->request.type & VIA_IRQ_SIGNAL) {
375 DRM_ERROR("Signals on Via IRQs not implemented yet.\n");
376 return -EINVAL;
377 }
378
379 force_sequence = (irqwait->request.type & VIA_IRQ_FORCE_SEQUENCE);
380
381 ret = via_driver_irq_wait(dev, irqwait->request.irq, force_sequence,
382 &irqwait->request.sequence);
383 ktime_get_ts64(&now);
384 irqwait->reply.tval_sec = now.tv_sec;
385 irqwait->reply.tval_usec = now.tv_nsec / NSEC_PER_USEC;
386
387 return ret;
388 }
389