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 #define VIA_IRQ_DMA0_DD_ENABLE  (1 << 20)
  54 #define VIA_IRQ_DMA0_TD_ENABLE  (1 << 21)
  55 #define VIA_IRQ_DMA1_DD_ENABLE  (1 << 22)
  56 #define VIA_IRQ_DMA1_TD_ENABLE  (1 << 23)
  57 #define VIA_IRQ_DMA0_DD_PENDING (1 << 4)
  58 #define VIA_IRQ_DMA0_TD_PENDING (1 << 5)
  59 #define VIA_IRQ_DMA1_DD_PENDING (1 << 6)
  60 #define VIA_IRQ_DMA1_TD_PENDING (1 << 7)
  61
  62
  63 /*
  64  * Device-specific IRQs go here. This type might need to be extended with
  65  * the register if there are multiple IRQ control registers.
  66  * Currently we activate the HQV interrupts of  Unichrome Pro group A.
  67  */
  68
  69 static maskarray_t via_pro_group_a_irqs[] = {
  70         {VIA_IRQ_HQV0_ENABLE, VIA_IRQ_HQV0_PENDING, 0x000003D0, 0x00008010,
  71          0x00000000},
  72         {VIA_IRQ_HQV1_ENABLE, VIA_IRQ_HQV1_PENDING, 0x000013D0, 0x00008010,
  73          0x00000000},
  74         {VIA_IRQ_DMA0_TD_ENABLE, VIA_IRQ_DMA0_TD_PENDING, VIA_PCI_DMA_CSR0,
  75          VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008},
  76         {VIA_IRQ_DMA1_TD_ENABLE, VIA_IRQ_DMA1_TD_PENDING, VIA_PCI_DMA_CSR1,
  77          VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008},
  78 };
  79 static int via_num_pro_group_a =
  80     sizeof(via_pro_group_a_irqs) / sizeof(maskarray_t);
  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 = sizeof(via_unichrome_irqs) / sizeof(maskarray_t);
  90 static int via_irqmap_unichrome[] = {-1, -1, -1, 0, -1, 1};
  91
  92 static unsigned time_diff(struct timeval *now, struct timeval *then)
  93 {
  94         return (now->tv_usec >= then->tv_usec) ?
  95             now->tv_usec - then->tv_usec :
  96             1000000 - (then->tv_usec - now->tv_usec);
  97 }
  98
  99 irqreturn_t via_driver_irq_handler(DRM_IRQ_ARGS)
 100 {
 101         drm_device_t *dev = (drm_device_t *) arg;
 102         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 103         u32 status;
 104         int handled = 0;
 105         struct timeval cur_vblank;
 106         drm_via_irq_t *cur_irq = dev_priv->via_irqs;
 107         int i;
 108
 109         status = VIA_READ(VIA_REG_INTERRUPT);
 110         if (status & VIA_IRQ_VBLANK_PENDING) {
 111                 atomic_inc(&dev->vbl_received);
 112                 if (!(atomic_read(&dev->vbl_received) & 0x0F)) {
 113                         do_gettimeofday(&cur_vblank);
 114                         if (dev_priv->last_vblank_valid) {
 115                                 dev_priv->usec_per_vblank =
 116                                     time_diff(&cur_vblank,
 117                                               &dev_priv->last_vblank) >> 4;
 118                         }
 119                         dev_priv->last_vblank = cur_vblank;
 120                         dev_priv->last_vblank_valid = 1;
 121                 }
 122                 if (!(atomic_read(&dev->vbl_received) & 0xFF)) {
 123                         DRM_DEBUG("US per vblank is: %u\n",
 124                                   dev_priv->usec_per_vblank);
 125                 }
 126                 DRM_WAKEUP(&dev->vbl_queue);
 127                 drm_vbl_send_signals(dev);
 128                 handled = 1;
 129         }
 130
 131         for (i = 0; i < dev_priv->num_irqs; ++i) {
 132                 if (status & cur_irq->pending_mask) {
 133                         atomic_inc(&cur_irq->irq_received);
 134                         DRM_WAKEUP(&cur_irq->irq_queue);
 135                         handled = 1;
 136                         if (dev_priv->irq_map[drm_via_irq_dma0_td] == i) {
 137                                 via_dmablit_handler(dev, 0, 1);
 138                         } else if (dev_priv->irq_map[drm_via_irq_dma1_td] == i) {
 139                                 via_dmablit_handler(dev, 1, 1);
 140                         }
 141                 }
 142                 cur_irq++;
 143         }
 144
 145         /* Acknowlege interrupts */
 146         VIA_WRITE(VIA_REG_INTERRUPT, status);
 147
 148         if (handled)
 149                 return IRQ_HANDLED;
 150         else
 151                 return IRQ_NONE;
 152 }
 153
 154 static __inline__ void viadrv_acknowledge_irqs(drm_via_private_t * dev_priv)
 155 {
 156         u32 status;
 157
 158         if (dev_priv) {
 159                 /* Acknowlege interrupts */
 160                 status = VIA_READ(VIA_REG_INTERRUPT);
 161                 VIA_WRITE(VIA_REG_INTERRUPT, status |
 162                           dev_priv->irq_pending_mask);
 163         }
 164 }
 165
 166 int via_driver_vblank_wait(drm_device_t * dev, unsigned int *sequence)
 167 {
 168         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 169         unsigned int cur_vblank;
 170         int ret = 0;
 171
 172         DRM_DEBUG("viadrv_vblank_wait\n");
 173         if (!dev_priv) {
 174                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 175                 return -EINVAL;
 176         }
 177
 178         viadrv_acknowledge_irqs(dev_priv);
 179
 180         /* Assume that the user has missed the current sequence number
 181          * by about a day rather than she wants to wait for years
 182          * using vertical blanks...
 183          */
 184
 185         DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
 186                     (((cur_vblank = atomic_read(&dev->vbl_received)) -
 187                       *sequence) <= (1 << 23)));
 188
 189         *sequence = cur_vblank;
 190         return ret;
 191 }
 192
 193 static int
 194 via_driver_irq_wait(drm_device_t * dev, unsigned int irq, int force_sequence,
 195                     unsigned int *sequence)
 196 {
 197         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 198         unsigned int cur_irq_sequence;
 199         drm_via_irq_t *cur_irq;
 200         int ret = 0;
 201         maskarray_t *masks;
 202         int real_irq;
 203
 204         DRM_DEBUG("%s\n", __FUNCTION__);
 205
 206         if (!dev_priv) {
 207                 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 208                 return DRM_ERR(EINVAL);
 209         }
 210
 211         if (irq >= drm_via_irq_num) {
 212                 DRM_ERROR("%s Trying to wait on unknown irq %d\n", __FUNCTION__,
 213                           irq);
 214                 return DRM_ERR(EINVAL);
 215         }
 216
 217         real_irq = dev_priv->irq_map[irq];
 218
 219         if (real_irq < 0) {
 220                 DRM_ERROR("%s Video IRQ %d not available on this hardware.\n",
 221                           __FUNCTION__, irq);
 222                 return DRM_ERR(EINVAL);
 223         }
 224
 225         masks = dev_priv->irq_masks;
 226         cur_irq = dev_priv->via_irqs + real_irq;
 227
 228         if (masks[real_irq][2] && !force_sequence) {
 229                 DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * DRM_HZ,
 230                             ((VIA_READ(masks[irq][2]) & masks[irq][3]) ==
 231                              masks[irq][4]));
 232                 cur_irq_sequence = atomic_read(&cur_irq->irq_received);
 233         } else {
 234                 DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * DRM_HZ,
 235                             (((cur_irq_sequence =
 236                                atomic_read(&cur_irq->irq_received)) -
 237                               *sequence) <= (1 << 23)));
 238         }
 239         *sequence = cur_irq_sequence;
 240         return ret;
 241 }
 242
 243 /*
 244  * drm_dma.h hooks
 245  */
 246
 247 void via_driver_irq_preinstall(drm_device_t * dev)
 248 {
 249         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 250         u32 status;
 251         drm_via_irq_t *cur_irq;
 252         int i;
 253
 254         DRM_DEBUG("driver_irq_preinstall: dev_priv: %p\n", dev_priv);
 255         if (dev_priv) {
 256                 cur_irq = dev_priv->via_irqs;
 257
 258                 dev_priv->irq_enable_mask = VIA_IRQ_VBLANK_ENABLE;
 259                 dev_priv->irq_pending_mask = VIA_IRQ_VBLANK_PENDING;
 260
 261                 dev_priv->irq_masks = (dev_priv->pro_group_a) ?
 262                     via_pro_group_a_irqs : via_unichrome_irqs;
 263                 dev_priv->num_irqs = (dev_priv->pro_group_a) ?
 264                     via_num_pro_group_a : via_num_unichrome;
 265                 dev_priv->irq_map = (dev_priv->pro_group_a) ?
 266                         via_irqmap_pro_group_a : via_irqmap_unichrome;
 267
 268                 for (i = 0; i < dev_priv->num_irqs; ++i) {
 269                         atomic_set(&cur_irq->irq_received, 0);
 270                         cur_irq->enable_mask = dev_priv->irq_masks[i][0];
 271                         cur_irq->pending_mask = dev_priv->irq_masks[i][1];
 272                         DRM_INIT_WAITQUEUE(&cur_irq->irq_queue);
 273                         dev_priv->irq_enable_mask |= cur_irq->enable_mask;
 274                         dev_priv->irq_pending_mask |= cur_irq->pending_mask;
 275                         cur_irq++;
 276
 277                         DRM_DEBUG("Initializing IRQ %d\n", i);
 278                 }
 279
 280                 dev_priv->last_vblank_valid = 0;
 281
 282                 /* Clear VSync interrupt regs */
 283                 status = VIA_READ(VIA_REG_INTERRUPT);
 284                 VIA_WRITE(VIA_REG_INTERRUPT, status &
 285                           ~(dev_priv->irq_enable_mask));
 286
 287                 /* Clear bits if they're already high */
 288                 viadrv_acknowledge_irqs(dev_priv);
 289         }
 290 }
 291
 292 void via_driver_irq_postinstall(drm_device_t * dev)
 293 {
 294         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 295         u32 status;
 296
 297         DRM_DEBUG("via_driver_irq_postinstall\n");
 298         if (dev_priv) {
 299                 status = VIA_READ(VIA_REG_INTERRUPT);
 300                 VIA_WRITE(VIA_REG_INTERRUPT, status | VIA_IRQ_GLOBAL
 301                           | dev_priv->irq_enable_mask);
 302
 303                 /* Some magic, oh for some data sheets ! */
 304
 305                 VIA_WRITE8(0x83d4, 0x11);
 306                 VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) | 0x30);
 307
 308         }
 309 }
 310
 311 void via_driver_irq_uninstall(drm_device_t * dev)
 312 {
 313         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 314         u32 status;
 315
 316         DRM_DEBUG("driver_irq_uninstall)\n");
 317         if (dev_priv) {
 318
 319                 /* Some more magic, oh for some data sheets ! */
 320
 321                 VIA_WRITE8(0x83d4, 0x11);
 322                 VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) & ~0x30);
 323
 324                 status = VIA_READ(VIA_REG_INTERRUPT);
 325                 VIA_WRITE(VIA_REG_INTERRUPT, status &
 326                           ~(VIA_IRQ_VBLANK_ENABLE | dev_priv->irq_enable_mask));
 327         }
 328 }
 329
 330 int via_wait_irq(DRM_IOCTL_ARGS)
 331 {
 332         DRM_DEVICE;
 333         drm_via_irqwait_t __user *argp = (void __user *)data;
 334         drm_via_irqwait_t irqwait;
 335         struct timeval now;
 336         int ret = 0;
 337         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 338         drm_via_irq_t *cur_irq = dev_priv->via_irqs;
 339         int force_sequence;
 340
 341         if (!dev->irq)
 342                 return DRM_ERR(EINVAL);
 343
 344         DRM_COPY_FROM_USER_IOCTL(irqwait, argp, sizeof(irqwait));
 345         if (irqwait.request.irq >= dev_priv->num_irqs) {
 346                 DRM_ERROR("%s Trying to wait on unknown irq %d\n", __FUNCTION__,
 347                           irqwait.request.irq);
 348                 return DRM_ERR(EINVAL);
 349         }
 350
 351         cur_irq += irqwait.request.irq;
 352
 353         switch (irqwait.request.type & ~VIA_IRQ_FLAGS_MASK) {
 354         case VIA_IRQ_RELATIVE:
 355                 irqwait.request.sequence += atomic_read(&cur_irq->irq_received);
 356                 irqwait.request.type &= ~_DRM_VBLANK_RELATIVE;
 357         case VIA_IRQ_ABSOLUTE:
 358                 break;
 359         default:
 360                 return DRM_ERR(EINVAL);
 361         }
 362
 363         if (irqwait.request.type & VIA_IRQ_SIGNAL) {
 364                 DRM_ERROR("%s Signals on Via IRQs not implemented yet.\n",
 365                           __FUNCTION__);
 366                 return DRM_ERR(EINVAL);
 367         }
 368
 369         force_sequence = (irqwait.request.type & VIA_IRQ_FORCE_SEQUENCE);
 370
 371         ret = via_driver_irq_wait(dev, irqwait.request.irq, force_sequence,
 372                                   &irqwait.request.sequence);
 373         do_gettimeofday(&now);
 374         irqwait.reply.tval_sec = now.tv_sec;
 375         irqwait.reply.tval_usec = now.tv_usec;
 376
 377         DRM_COPY_TO_USER_IOCTL(argp, irqwait, sizeof(irqwait));
 378
 379         return ret;
 380 }