git.oblomov.eu Git - linux-2.6/blob - 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 u32 via_get_vblank_counter(struct drm_device *dev, int crtc)
 100 {
 101         drm_via_private_t *dev_priv = dev->dev_private;
 102         if (crtc != 0)
 103                 return 0;
 104
 105         return atomic_read(&dev_priv->vbl_received);
 106 }
 107
 108 irqreturn_t via_driver_irq_handler(DRM_IRQ_ARGS)
 109 {
 110         struct drm_device *dev = (struct drm_device *) arg;
 111         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 112         u32 status;
 113         int handled = 0;
 114         struct timeval cur_vblank;
 115         drm_via_irq_t *cur_irq = dev_priv->via_irqs;
 116         int i;
 117
 118         status = VIA_READ(VIA_REG_INTERRUPT);
 119         if (status & VIA_IRQ_VBLANK_PENDING) {
 120                 atomic_inc(&dev_priv->vbl_received);
 121                 if (!(atomic_read(&dev_priv->vbl_received) & 0x0F)) {
 122                         do_gettimeofday(&cur_vblank);
 123                         if (dev_priv->last_vblank_valid) {
 124                                 dev_priv->usec_per_vblank =
 125                                     time_diff(&cur_vblank,
 126                                               &dev_priv->last_vblank) >> 4;
 127                         }
 128                         dev_priv->last_vblank = cur_vblank;
 129                         dev_priv->last_vblank_valid = 1;
 130                 }
 131                 if (!(atomic_read(&dev_priv->vbl_received) & 0xFF)) {
 132                         DRM_DEBUG("US per vblank is: %u\n",
 133                                   dev_priv->usec_per_vblank);
 134                 }
 135                 drm_handle_vblank(dev, 0);
 136                 handled = 1;
 137         }
 138
 139         for (i = 0; i < dev_priv->num_irqs; ++i) {
 140                 if (status & cur_irq->pending_mask) {
 141                         atomic_inc(&cur_irq->irq_received);
 142                         DRM_WAKEUP(&cur_irq->irq_queue);
 143                         handled = 1;
 144                         if (dev_priv->irq_map[drm_via_irq_dma0_td] == i) {
 145                                 via_dmablit_handler(dev, 0, 1);
 146                         } else if (dev_priv->irq_map[drm_via_irq_dma1_td] == i) {
 147                                 via_dmablit_handler(dev, 1, 1);
 148                         }
 149                 }
 150                 cur_irq++;
 151         }
 152
 153         /* Acknowlege interrupts */
 154         VIA_WRITE(VIA_REG_INTERRUPT, status);
 155
 156         if (handled)
 157                 return IRQ_HANDLED;
 158         else
 159                 return IRQ_NONE;
 160 }
 161
 162 static __inline__ void viadrv_acknowledge_irqs(drm_via_private_t * dev_priv)
 163 {
 164         u32 status;
 165
 166         if (dev_priv) {
 167                 /* Acknowlege interrupts */
 168                 status = VIA_READ(VIA_REG_INTERRUPT);
 169                 VIA_WRITE(VIA_REG_INTERRUPT, status |
 170                           dev_priv->irq_pending_mask);
 171         }
 172 }
 173
 174 int via_enable_vblank(struct drm_device *dev, int crtc)
 175 {
 176         drm_via_private_t *dev_priv = dev->dev_private;
 177         u32 status;
 178
 179         if (crtc != 0) {
 180                 DRM_ERROR("%s:  bad crtc %d\n", __FUNCTION__, crtc);
 181                 return -EINVAL;
 182         }
 183
 184         status = VIA_READ(VIA_REG_INTERRUPT);
 185         VIA_WRITE(VIA_REG_INTERRUPT, status & VIA_IRQ_VBLANK_ENABLE);
 186
 187         VIA_WRITE8(0x83d4, 0x11);
 188         VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) | 0x30);
 189
 190         return 0;
 191 }
 192
 193 void via_disable_vblank(struct drm_device *dev, int crtc)
 194 {
 195         drm_via_private_t *dev_priv = dev->dev_private;
 196
 197         VIA_WRITE8(0x83d4, 0x11);
 198         VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) & ~0x30);
 199
 200         if (crtc != 0)
 201                 DRM_ERROR("%s:  bad crtc %d\n", __FUNCTION__, crtc);
 202 }
 203
 204 static int
 205 via_driver_irq_wait(struct drm_device * dev, unsigned int irq, int force_sequence,
 206                     unsigned int *sequence)
 207 {
 208         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 209         unsigned int cur_irq_sequence;
 210         drm_via_irq_t *cur_irq;
 211         int ret = 0;
 212         maskarray_t *masks;
 213         int real_irq;
 214
 215         DRM_DEBUG("\n");
 216
 217         if (!dev_priv) {
 218                 DRM_ERROR("called with no initialization\n");
 219                 return -EINVAL;
 220         }
 221
 222         if (irq >= drm_via_irq_num) {
 223                 DRM_ERROR("Trying to wait on unknown irq %d\n", irq);
 224                 return -EINVAL;
 225         }
 226
 227         real_irq = dev_priv->irq_map[irq];
 228
 229         if (real_irq < 0) {
 230                 DRM_ERROR("Video IRQ %d not available on this hardware.\n",
 231                           irq);
 232                 return -EINVAL;
 233         }
 234
 235         masks = dev_priv->irq_masks;
 236         cur_irq = dev_priv->via_irqs + real_irq;
 237
 238         if (masks[real_irq][2] && !force_sequence) {
 239                 DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * DRM_HZ,
 240                             ((VIA_READ(masks[irq][2]) & masks[irq][3]) ==
 241                              masks[irq][4]));
 242                 cur_irq_sequence = atomic_read(&cur_irq->irq_received);
 243         } else {
 244                 DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * DRM_HZ,
 245                             (((cur_irq_sequence =
 246                                atomic_read(&cur_irq->irq_received)) -
 247                               *sequence) <= (1 << 23)));
 248         }
 249         *sequence = cur_irq_sequence;
 250         return ret;
 251 }
 252
 253 /*
 254  * drm_dma.h hooks
 255  */
 256
 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                         DRM_INIT_WAITQUEUE(&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(VIA_REG_INTERRUPT);
 298                 VIA_WRITE(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
 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("via_driver_irq_postinstall\n");
 312         if (!dev_priv)
 313                 return -EINVAL;
 314
 315         drm_vblank_init(dev, 1);
 316         status = VIA_READ(VIA_REG_INTERRUPT);
 317         VIA_WRITE(VIA_REG_INTERRUPT, status | VIA_IRQ_GLOBAL
 318                   | dev_priv->irq_enable_mask);
 319
 320         /* Some magic, oh for some data sheets ! */
 321         VIA_WRITE8(0x83d4, 0x11);
 322         VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) | 0x30);
 323
 324         return 0;
 325 }
 326
 327 void via_driver_irq_uninstall(struct drm_device * dev)
 328 {
 329         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 330         u32 status;
 331
 332         DRM_DEBUG("\n");
 333         if (dev_priv) {
 334
 335                 /* Some more magic, oh for some data sheets ! */
 336
 337                 VIA_WRITE8(0x83d4, 0x11);
 338                 VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) & ~0x30);
 339
 340                 status = VIA_READ(VIA_REG_INTERRUPT);
 341                 VIA_WRITE(VIA_REG_INTERRUPT, status &
 342                           ~(VIA_IRQ_VBLANK_ENABLE | dev_priv->irq_enable_mask));
 343         }
 344 }
 345
 346 int via_wait_irq(struct drm_device *dev, void *data, struct drm_file *file_priv)
 347 {
 348         drm_via_irqwait_t *irqwait = data;
 349         struct timeval now;
 350         int ret = 0;
 351         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 352         drm_via_irq_t *cur_irq = dev_priv->via_irqs;
 353         int force_sequence;
 354
 355         if (!dev->irq)
 356                 return -EINVAL;
 357
 358         if (irqwait->request.irq >= dev_priv->num_irqs) {
 359                 DRM_ERROR("Trying to wait on unknown irq %d\n",
 360                           irqwait->request.irq);
 361                 return -EINVAL;
 362         }
 363
 364         cur_irq += irqwait->request.irq;
 365
 366         switch (irqwait->request.type & ~VIA_IRQ_FLAGS_MASK) {
 367         case VIA_IRQ_RELATIVE:
 368                 irqwait->request.sequence += atomic_read(&cur_irq->irq_received);
 369                 irqwait->request.type &= ~_DRM_VBLANK_RELATIVE;
 370         case VIA_IRQ_ABSOLUTE:
 371                 break;
 372         default:
 373                 return -EINVAL;
 374         }
 375
 376         if (irqwait->request.type & VIA_IRQ_SIGNAL) {
 377                 DRM_ERROR("Signals on Via IRQs not implemented yet.\n");
 378                 return -EINVAL;
 379         }
 380
 381         force_sequence = (irqwait->request.type & VIA_IRQ_FORCE_SEQUENCE);
 382
 383         ret = via_driver_irq_wait(dev, irqwait->request.irq, force_sequence,
 384                                   &irqwait->request.sequence);
 385         do_gettimeofday(&now);
 386         irqwait->reply.tval_sec = now.tv_sec;
 387         irqwait->reply.tval_usec = now.tv_usec;
 388
 389         return ret;
 390 }