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22f579c6 DA |
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 "drmP.h" | |
39 | #include "drm.h" | |
40 | #include "via_drm.h" | |
41 | #include "via_drv.h" | |
42 | ||
43 | #define VIA_REG_INTERRUPT 0x200 | |
44 | ||
45 | /* VIA_REG_INTERRUPT */ | |
46 | #define VIA_IRQ_GLOBAL (1 << 31) | |
47 | #define VIA_IRQ_VBLANK_ENABLE (1 << 19) | |
48 | #define VIA_IRQ_VBLANK_PENDING (1 << 3) | |
49 | #define VIA_IRQ_HQV0_ENABLE (1 << 11) | |
50 | #define VIA_IRQ_HQV1_ENABLE (1 << 25) | |
51 | #define VIA_IRQ_HQV0_PENDING (1 << 9) | |
52 | #define VIA_IRQ_HQV1_PENDING (1 << 10) | |
53 | ||
54 | /* | |
55 | * Device-specific IRQs go here. This type might need to be extended with | |
56 | * the register if there are multiple IRQ control registers. | |
b5e89ed5 | 57 | * Currently we activate the HQV interrupts of Unichrome Pro group A. |
22f579c6 DA |
58 | */ |
59 | ||
60 | static maskarray_t via_pro_group_a_irqs[] = { | |
b5e89ed5 DA |
61 | {VIA_IRQ_HQV0_ENABLE, VIA_IRQ_HQV0_PENDING, 0x000003D0, 0x00008010, |
62 | 0x00000000}, | |
63 | {VIA_IRQ_HQV1_ENABLE, VIA_IRQ_HQV1_PENDING, 0x000013D0, 0x00008010, | |
64 | 0x00000000} | |
65 | }; | |
66 | static int via_num_pro_group_a = | |
67 | sizeof(via_pro_group_a_irqs) / sizeof(maskarray_t); | |
68 | ||
69 | static maskarray_t via_unichrome_irqs[] = { }; | |
70 | static int via_num_unichrome = sizeof(via_unichrome_irqs) / sizeof(maskarray_t); | |
71 | ||
72 | static unsigned time_diff(struct timeval *now, struct timeval *then) | |
22f579c6 | 73 | { |
b5e89ed5 DA |
74 | return (now->tv_usec >= then->tv_usec) ? |
75 | now->tv_usec - then->tv_usec : | |
76 | 1000000 - (then->tv_usec - now->tv_usec); | |
22f579c6 DA |
77 | } |
78 | ||
79 | irqreturn_t via_driver_irq_handler(DRM_IRQ_ARGS) | |
80 | { | |
81 | drm_device_t *dev = (drm_device_t *) arg; | |
82 | drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private; | |
83 | u32 status; | |
84 | int handled = 0; | |
85 | struct timeval cur_vblank; | |
86 | drm_via_irq_t *cur_irq = dev_priv->via_irqs; | |
87 | int i; | |
88 | ||
89 | status = VIA_READ(VIA_REG_INTERRUPT); | |
90 | if (status & VIA_IRQ_VBLANK_PENDING) { | |
91 | atomic_inc(&dev->vbl_received); | |
b5e89ed5 | 92 | if (!(atomic_read(&dev->vbl_received) & 0x0F)) { |
22f579c6 | 93 | do_gettimeofday(&cur_vblank); |
b5e89ed5 DA |
94 | if (dev_priv->last_vblank_valid) { |
95 | dev_priv->usec_per_vblank = | |
96 | time_diff(&cur_vblank, | |
97 | &dev_priv->last_vblank) >> 4; | |
22f579c6 DA |
98 | } |
99 | dev_priv->last_vblank = cur_vblank; | |
100 | dev_priv->last_vblank_valid = 1; | |
b5e89ed5 DA |
101 | } |
102 | if (!(atomic_read(&dev->vbl_received) & 0xFF)) { | |
22f579c6 | 103 | DRM_DEBUG("US per vblank is: %u\n", |
b5e89ed5 | 104 | dev_priv->usec_per_vblank); |
22f579c6 DA |
105 | } |
106 | DRM_WAKEUP(&dev->vbl_queue); | |
107 | drm_vbl_send_signals(dev); | |
108 | handled = 1; | |
109 | } | |
22f579c6 | 110 | |
b5e89ed5 | 111 | for (i = 0; i < dev_priv->num_irqs; ++i) { |
22f579c6 | 112 | if (status & cur_irq->pending_mask) { |
b5e89ed5 DA |
113 | atomic_inc(&cur_irq->irq_received); |
114 | DRM_WAKEUP(&cur_irq->irq_queue); | |
22f579c6 DA |
115 | handled = 1; |
116 | } | |
117 | cur_irq++; | |
118 | } | |
b5e89ed5 | 119 | |
22f579c6 DA |
120 | /* Acknowlege interrupts */ |
121 | VIA_WRITE(VIA_REG_INTERRUPT, status); | |
122 | ||
22f579c6 DA |
123 | if (handled) |
124 | return IRQ_HANDLED; | |
125 | else | |
126 | return IRQ_NONE; | |
127 | } | |
128 | ||
129 | static __inline__ void viadrv_acknowledge_irqs(drm_via_private_t * dev_priv) | |
130 | { | |
131 | u32 status; | |
132 | ||
133 | if (dev_priv) { | |
134 | /* Acknowlege interrupts */ | |
135 | status = VIA_READ(VIA_REG_INTERRUPT); | |
b5e89ed5 | 136 | VIA_WRITE(VIA_REG_INTERRUPT, status | |
22f579c6 DA |
137 | dev_priv->irq_pending_mask); |
138 | } | |
139 | } | |
140 | ||
141 | int via_driver_vblank_wait(drm_device_t * dev, unsigned int *sequence) | |
142 | { | |
143 | drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private; | |
144 | unsigned int cur_vblank; | |
145 | int ret = 0; | |
146 | ||
147 | DRM_DEBUG("viadrv_vblank_wait\n"); | |
148 | if (!dev_priv) { | |
149 | DRM_ERROR("%s called with no initialization\n", __FUNCTION__); | |
150 | return -EINVAL; | |
151 | } | |
152 | ||
153 | viadrv_acknowledge_irqs(dev_priv); | |
154 | ||
155 | /* Assume that the user has missed the current sequence number | |
156 | * by about a day rather than she wants to wait for years | |
157 | * using vertical blanks... | |
158 | */ | |
159 | ||
160 | DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ, | |
161 | (((cur_vblank = atomic_read(&dev->vbl_received)) - | |
162 | *sequence) <= (1 << 23))); | |
b5e89ed5 | 163 | |
22f579c6 DA |
164 | *sequence = cur_vblank; |
165 | return ret; | |
166 | } | |
167 | ||
b5e89ed5 | 168 | static int |
22f579c6 DA |
169 | via_driver_irq_wait(drm_device_t * dev, unsigned int irq, int force_sequence, |
170 | unsigned int *sequence) | |
171 | { | |
172 | drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private; | |
173 | unsigned int cur_irq_sequence; | |
174 | drm_via_irq_t *cur_irq = dev_priv->via_irqs; | |
175 | int ret = 0; | |
176 | maskarray_t *masks = dev_priv->irq_masks; | |
177 | ||
178 | DRM_DEBUG("%s\n", __FUNCTION__); | |
179 | ||
180 | if (!dev_priv) { | |
181 | DRM_ERROR("%s called with no initialization\n", __FUNCTION__); | |
182 | return DRM_ERR(EINVAL); | |
183 | } | |
184 | ||
b5e89ed5 DA |
185 | if (irq >= dev_priv->num_irqs) { |
186 | DRM_ERROR("%s Trying to wait on unknown irq %d\n", __FUNCTION__, | |
187 | irq); | |
22f579c6 DA |
188 | return DRM_ERR(EINVAL); |
189 | } | |
b5e89ed5 | 190 | |
22f579c6 DA |
191 | cur_irq += irq; |
192 | ||
193 | if (masks[irq][2] && !force_sequence) { | |
194 | DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * DRM_HZ, | |
b5e89ed5 DA |
195 | ((VIA_READ(masks[irq][2]) & masks[irq][3]) == |
196 | masks[irq][4])); | |
22f579c6 DA |
197 | cur_irq_sequence = atomic_read(&cur_irq->irq_received); |
198 | } else { | |
199 | DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * DRM_HZ, | |
b5e89ed5 DA |
200 | (((cur_irq_sequence = |
201 | atomic_read(&cur_irq->irq_received)) - | |
202 | *sequence) <= (1 << 23))); | |
22f579c6 DA |
203 | } |
204 | *sequence = cur_irq_sequence; | |
205 | return ret; | |
206 | } | |
207 | ||
22f579c6 DA |
208 | /* |
209 | * drm_dma.h hooks | |
210 | */ | |
211 | ||
212 | void via_driver_irq_preinstall(drm_device_t * dev) | |
213 | { | |
214 | drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private; | |
215 | u32 status; | |
216 | drm_via_irq_t *cur_irq = dev_priv->via_irqs; | |
217 | int i; | |
218 | ||
219 | DRM_DEBUG("driver_irq_preinstall: dev_priv: %p\n", dev_priv); | |
220 | if (dev_priv) { | |
221 | ||
222 | dev_priv->irq_enable_mask = VIA_IRQ_VBLANK_ENABLE; | |
223 | dev_priv->irq_pending_mask = VIA_IRQ_VBLANK_PENDING; | |
224 | ||
225 | dev_priv->irq_masks = (dev_priv->pro_group_a) ? | |
b5e89ed5 | 226 | via_pro_group_a_irqs : via_unichrome_irqs; |
22f579c6 | 227 | dev_priv->num_irqs = (dev_priv->pro_group_a) ? |
b5e89ed5 DA |
228 | via_num_pro_group_a : via_num_unichrome; |
229 | ||
230 | for (i = 0; i < dev_priv->num_irqs; ++i) { | |
22f579c6 | 231 | atomic_set(&cur_irq->irq_received, 0); |
b5e89ed5 | 232 | cur_irq->enable_mask = dev_priv->irq_masks[i][0]; |
22f579c6 | 233 | cur_irq->pending_mask = dev_priv->irq_masks[i][1]; |
b5e89ed5 | 234 | DRM_INIT_WAITQUEUE(&cur_irq->irq_queue); |
22f579c6 DA |
235 | dev_priv->irq_enable_mask |= cur_irq->enable_mask; |
236 | dev_priv->irq_pending_mask |= cur_irq->pending_mask; | |
237 | cur_irq++; | |
b5e89ed5 | 238 | |
22f579c6 DA |
239 | DRM_DEBUG("Initializing IRQ %d\n", i); |
240 | } | |
b5e89ed5 DA |
241 | |
242 | dev_priv->last_vblank_valid = 0; | |
22f579c6 DA |
243 | |
244 | // Clear VSync interrupt regs | |
245 | status = VIA_READ(VIA_REG_INTERRUPT); | |
b5e89ed5 | 246 | VIA_WRITE(VIA_REG_INTERRUPT, status & |
22f579c6 | 247 | ~(dev_priv->irq_enable_mask)); |
b5e89ed5 | 248 | |
22f579c6 DA |
249 | /* Clear bits if they're already high */ |
250 | viadrv_acknowledge_irqs(dev_priv); | |
251 | } | |
252 | } | |
253 | ||
254 | void via_driver_irq_postinstall(drm_device_t * dev) | |
255 | { | |
256 | drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private; | |
257 | u32 status; | |
258 | ||
259 | DRM_DEBUG("via_driver_irq_postinstall\n"); | |
260 | if (dev_priv) { | |
261 | status = VIA_READ(VIA_REG_INTERRUPT); | |
262 | VIA_WRITE(VIA_REG_INTERRUPT, status | VIA_IRQ_GLOBAL | |
263 | | dev_priv->irq_enable_mask); | |
264 | ||
265 | /* Some magic, oh for some data sheets ! */ | |
266 | ||
267 | VIA_WRITE8(0x83d4, 0x11); | |
268 | VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) | 0x30); | |
b5e89ed5 | 269 | |
22f579c6 DA |
270 | } |
271 | } | |
272 | ||
273 | void via_driver_irq_uninstall(drm_device_t * dev) | |
274 | { | |
275 | drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private; | |
276 | u32 status; | |
277 | ||
278 | DRM_DEBUG("driver_irq_uninstall)\n"); | |
279 | if (dev_priv) { | |
280 | ||
281 | /* Some more magic, oh for some data sheets ! */ | |
282 | ||
283 | VIA_WRITE8(0x83d4, 0x11); | |
284 | VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) & ~0x30); | |
285 | ||
286 | status = VIA_READ(VIA_REG_INTERRUPT); | |
b5e89ed5 | 287 | VIA_WRITE(VIA_REG_INTERRUPT, status & |
22f579c6 DA |
288 | ~(VIA_IRQ_VBLANK_ENABLE | dev_priv->irq_enable_mask)); |
289 | } | |
290 | } | |
291 | ||
292 | int via_wait_irq(DRM_IOCTL_ARGS) | |
293 | { | |
294 | drm_file_t *priv = filp->private_data; | |
295 | drm_device_t *dev = priv->head->dev; | |
296 | drm_via_irqwait_t __user *argp = (void __user *)data; | |
297 | drm_via_irqwait_t irqwait; | |
298 | struct timeval now; | |
299 | int ret = 0; | |
300 | drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private; | |
301 | drm_via_irq_t *cur_irq = dev_priv->via_irqs; | |
302 | int force_sequence; | |
303 | ||
304 | if (!dev->irq) | |
305 | return DRM_ERR(EINVAL); | |
306 | ||
307 | DRM_COPY_FROM_USER_IOCTL(irqwait, argp, sizeof(irqwait)); | |
308 | if (irqwait.request.irq >= dev_priv->num_irqs) { | |
b5e89ed5 | 309 | DRM_ERROR("%s Trying to wait on unknown irq %d\n", __FUNCTION__, |
22f579c6 DA |
310 | irqwait.request.irq); |
311 | return DRM_ERR(EINVAL); | |
312 | } | |
313 | ||
314 | cur_irq += irqwait.request.irq; | |
315 | ||
316 | switch (irqwait.request.type & ~VIA_IRQ_FLAGS_MASK) { | |
317 | case VIA_IRQ_RELATIVE: | |
318 | irqwait.request.sequence += atomic_read(&cur_irq->irq_received); | |
319 | irqwait.request.type &= ~_DRM_VBLANK_RELATIVE; | |
320 | case VIA_IRQ_ABSOLUTE: | |
321 | break; | |
322 | default: | |
323 | return DRM_ERR(EINVAL); | |
324 | } | |
325 | ||
326 | if (irqwait.request.type & VIA_IRQ_SIGNAL) { | |
b5e89ed5 | 327 | DRM_ERROR("%s Signals on Via IRQs not implemented yet.\n", |
22f579c6 DA |
328 | __FUNCTION__); |
329 | return DRM_ERR(EINVAL); | |
330 | } | |
331 | ||
332 | force_sequence = (irqwait.request.type & VIA_IRQ_FORCE_SEQUENCE); | |
333 | ||
334 | ret = via_driver_irq_wait(dev, irqwait.request.irq, force_sequence, | |
335 | &irqwait.request.sequence); | |
336 | do_gettimeofday(&now); | |
337 | irqwait.reply.tval_sec = now.tv_sec; | |
338 | irqwait.reply.tval_usec = now.tv_usec; | |
339 | ||
340 | DRM_COPY_TO_USER_IOCTL(argp, irqwait, sizeof(irqwait)); | |
341 | ||
342 | return ret; | |
343 | } |