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