drivers/char/drm/via_irq.c

   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.
  57  * Currently we activate the HQV interrupts of  Unichrome Pro group A.
  58  */
  59
  60 static maskarray_t via_pro_group_a_irqs[] = {
  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)
  73 {
  74         return (now->tv_usec >= then->tv_usec) ?
  75             now->tv_usec - then->tv_usec :
  76             1000000 - (then->tv_usec - now->tv_usec);
  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);
  92                 if (!(atomic_read(&dev->vbl_received) & 0x0F)) {
  93                         do_gettimeofday(&cur_vblank);
  94                         if (dev_priv->last_vblank_valid) {
  95                                 dev_priv->usec_per_vblank =
  96                                     time_diff(&cur_vblank,
  97                                               &dev_priv->last_vblank) >> 4;
  98                         }
  99                         dev_priv->last_vblank = cur_vblank;
 100                         dev_priv->last_vblank_valid = 1;
 101                 }
 102                 if (!(atomic_read(&dev->vbl_received) & 0xFF)) {
 103                         DRM_DEBUG("US per vblank is: %u\n",
 104                                   dev_priv->usec_per_vblank);
 105                 }
 106                 DRM_WAKEUP(&dev->vbl_queue);
 107                 drm_vbl_send_signals(dev);
 108                 handled = 1;
 109         }
 110
 111         for (i = 0; i < dev_priv->num_irqs; ++i) {
 112                 if (status & cur_irq->pending_mask) {
 113                         atomic_inc(&cur_irq->irq_received);
 114                         DRM_WAKEUP(&cur_irq->irq_queue);
 115                         handled = 1;
 116                 }
 117                 cur_irq++;
 118         }
 119
 120         /* Acknowlege interrupts */
 121         VIA_WRITE(VIA_REG_INTERRUPT, status);
 122
 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);
 136                 VIA_WRITE(VIA_REG_INTERRUPT, status |
 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)));
 163
 164         *sequence = cur_vblank;
 165         return ret;
 166 }
 167
 168 static int
 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
 185         if (irq >= dev_priv->num_irqs) {
 186                 DRM_ERROR("%s Trying to wait on unknown irq %d\n", __FUNCTION__,
 187                           irq);
 188                 return DRM_ERR(EINVAL);
 189         }
 190
 191         cur_irq += irq;
 192
 193         if (masks[irq][2] && !force_sequence) {
 194                 DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * DRM_HZ,
 195                             ((VIA_READ(masks[irq][2]) & masks[irq][3]) ==
 196                              masks[irq][4]));
 197                 cur_irq_sequence = atomic_read(&cur_irq->irq_received);
 198         } else {
 199                 DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * DRM_HZ,
 200                             (((cur_irq_sequence =
 201                                atomic_read(&cur_irq->irq_received)) -
 202                               *sequence) <= (1 << 23)));
 203         }
 204         *sequence = cur_irq_sequence;
 205         return ret;
 206 }
 207
 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) ?
 226                     via_pro_group_a_irqs : via_unichrome_irqs;
 227                 dev_priv->num_irqs = (dev_priv->pro_group_a) ?
 228                     via_num_pro_group_a : via_num_unichrome;
 229
 230                 for (i = 0; i < dev_priv->num_irqs; ++i) {
 231                         atomic_set(&cur_irq->irq_received, 0);
 232                         cur_irq->enable_mask = dev_priv->irq_masks[i][0];
 233                         cur_irq->pending_mask = dev_priv->irq_masks[i][1];
 234                         DRM_INIT_WAITQUEUE(&cur_irq->irq_queue);
 235                         dev_priv->irq_enable_mask |= cur_irq->enable_mask;
 236                         dev_priv->irq_pending_mask |= cur_irq->pending_mask;
 237                         cur_irq++;
 238
 239                         DRM_DEBUG("Initializing IRQ %d\n", i);
 240                 }
 241
 242                 dev_priv->last_vblank_valid = 0;
 243
 244                 // Clear VSync interrupt regs
 245                 status = VIA_READ(VIA_REG_INTERRUPT);
 246                 VIA_WRITE(VIA_REG_INTERRUPT, status &
 247                           ~(dev_priv->irq_enable_mask));
 248
 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);
 269
 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);
 287                 VIA_WRITE(VIA_REG_INTERRUPT, status &
 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) {
 309                 DRM_ERROR("%s Trying to wait on unknown irq %d\n", __FUNCTION__,
 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) {
 327                 DRM_ERROR("%s Signals on Via IRQs not implemented yet.\n",
 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 }