drivers/gpu/drm/via/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 <drm/drmP.h>
  39 #include <drm/via_drm.h>
  40 #include "via_drv.h"
  41
  42 #define VIA_REG_INTERRUPT       0x200
  43
  44 /* VIA_REG_INTERRUPT */
  45 #define VIA_IRQ_GLOBAL    (1 << 31)
  46 #define VIA_IRQ_VBLANK_ENABLE   (1 << 19)
  47 #define VIA_IRQ_VBLANK_PENDING  (1 << 3)
  48 #define VIA_IRQ_HQV0_ENABLE     (1 << 11)
  49 #define VIA_IRQ_HQV1_ENABLE     (1 << 25)
  50 #define VIA_IRQ_HQV0_PENDING    (1 << 9)
  51 #define VIA_IRQ_HQV1_PENDING    (1 << 10)
  52 #define VIA_IRQ_DMA0_DD_ENABLE  (1 << 20)
  53 #define VIA_IRQ_DMA0_TD_ENABLE  (1 << 21)
  54 #define VIA_IRQ_DMA1_DD_ENABLE  (1 << 22)
  55 #define VIA_IRQ_DMA1_TD_ENABLE  (1 << 23)
  56 #define VIA_IRQ_DMA0_DD_PENDING (1 << 4)
  57 #define VIA_IRQ_DMA0_TD_PENDING (1 << 5)
  58 #define VIA_IRQ_DMA1_DD_PENDING (1 << 6)
  59 #define VIA_IRQ_DMA1_TD_PENDING (1 << 7)
  60
  61
  62 /*
  63  * Device-specific IRQs go here. This type might need to be extended with
  64  * the register if there are multiple IRQ control registers.
  65  * Currently we activate the HQV interrupts of  Unichrome Pro group A.
  66  */
  67
  68 static maskarray_t via_pro_group_a_irqs[] = {
  69         {VIA_IRQ_HQV0_ENABLE, VIA_IRQ_HQV0_PENDING, 0x000003D0, 0x00008010,
  70          0x00000000 },
  71         {VIA_IRQ_HQV1_ENABLE, VIA_IRQ_HQV1_PENDING, 0x000013D0, 0x00008010,
  72          0x00000000 },
  73         {VIA_IRQ_DMA0_TD_ENABLE, VIA_IRQ_DMA0_TD_PENDING, VIA_PCI_DMA_CSR0,
  74          VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008},
  75         {VIA_IRQ_DMA1_TD_ENABLE, VIA_IRQ_DMA1_TD_PENDING, VIA_PCI_DMA_CSR1,
  76          VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008},
  77 };
  78 static int via_num_pro_group_a = ARRAY_SIZE(via_pro_group_a_irqs);
  79 static int via_irqmap_pro_group_a[] = {0, 1, -1, 2, -1, 3};
  80
  81 static maskarray_t via_unichrome_irqs[] = {
  82         {VIA_IRQ_DMA0_TD_ENABLE, VIA_IRQ_DMA0_TD_PENDING, VIA_PCI_DMA_CSR0,
  83          VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008},
  84         {VIA_IRQ_DMA1_TD_ENABLE, VIA_IRQ_DMA1_TD_PENDING, VIA_PCI_DMA_CSR1,
  85          VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008}
  86 };
  87 static int via_num_unichrome = ARRAY_SIZE(via_unichrome_irqs);
  88 static int via_irqmap_unichrome[] = {-1, -1, -1, 0, -1, 1};
  89
  90
  91 static unsigned time_diff(struct timeval *now, struct timeval *then)
  92 {
  93         return (now->tv_usec >= then->tv_usec) ?
  94                 now->tv_usec - then->tv_usec :
  95                 1000000 - (then->tv_usec - now->tv_usec);
  96 }
  97
  98 u32 via_get_vblank_counter(struct drm_device *dev, int crtc)
  99 {
 100         drm_via_private_t *dev_priv = dev->dev_private;
 101         if (crtc != 0)
 102                 return 0;
 103
 104         return atomic_read(&dev_priv->vbl_received);
 105 }
 106
 107 irqreturn_t via_driver_irq_handler(int irq, void *arg)
 108 {
 109         struct drm_device *dev = (struct drm_device *) arg;
 110         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 111         u32 status;
 112         int handled = 0;
 113         struct timeval cur_vblank;
 114         drm_via_irq_t *cur_irq = dev_priv->via_irqs;
 115         int i;
 116
 117         status = VIA_READ(VIA_REG_INTERRUPT);
 118         if (status & VIA_IRQ_VBLANK_PENDING) {
 119                 atomic_inc(&dev_priv->vbl_received);
 120                 if (!(atomic_read(&dev_priv->vbl_received) & 0x0F)) {
 121                         do_gettimeofday(&cur_vblank);
 122                         if (dev_priv->last_vblank_valid) {
 123                                 dev_priv->usec_per_vblank =
 124                                         time_diff(&cur_vblank,
 125                                                   &dev_priv->last_vblank) >> 4;
 126                         }
 127                         dev_priv->last_vblank = cur_vblank;
 128                         dev_priv->last_vblank_valid = 1;
 129                 }
 130                 if (!(atomic_read(&dev_priv->vbl_received) & 0xFF)) {
 131                         DRM_DEBUG("US per vblank is: %u\n",
 132                                   dev_priv->usec_per_vblank);
 133                 }
 134                 drm_handle_vblank(dev, 0);
 135                 handled = 1;
 136         }
 137
 138         for (i = 0; i < dev_priv->num_irqs; ++i) {
 139                 if (status & cur_irq->pending_mask) {
 140                         atomic_inc(&cur_irq->irq_received);
 141                         wake_up(&cur_irq->irq_queue);
 142                         handled = 1;
 143                         if (dev_priv->irq_map[drm_via_irq_dma0_td] == i)
 144                                 via_dmablit_handler(dev, 0, 1);
 145                         else if (dev_priv->irq_map[drm_via_irq_dma1_td] == i)
 146                                 via_dmablit_handler(dev, 1, 1);
 147                 }
 148                 cur_irq++;
 149         }
 150
 151         /* Acknowledge interrupts */
 152         VIA_WRITE(VIA_REG_INTERRUPT, status);
 153
 154
 155         if (handled)
 156                 return IRQ_HANDLED;
 157         else
 158                 return IRQ_NONE;
 159 }
 160
 161 static __inline__ void viadrv_acknowledge_irqs(drm_via_private_t *dev_priv)
 162 {
 163         u32 status;
 164
 165         if (dev_priv) {
 166                 /* Acknowledge interrupts */
 167                 status = VIA_READ(VIA_REG_INTERRUPT);
 168                 VIA_WRITE(VIA_REG_INTERRUPT, status |
 169                           dev_priv->irq_pending_mask);
 170         }
 171 }
 172
 173 int via_enable_vblank(struct drm_device *dev, int crtc)
 174 {
 175         drm_via_private_t *dev_priv = dev->dev_private;
 176         u32 status;
 177
 178         if (crtc != 0) {
 179                 DRM_ERROR("%s:  bad crtc %d\n", __func__, crtc);
 180                 return -EINVAL;
 181         }
 182
 183         status = VIA_READ(VIA_REG_INTERRUPT);
 184         VIA_WRITE(VIA_REG_INTERRUPT, status | VIA_IRQ_VBLANK_ENABLE);
 185
 186         VIA_WRITE8(0x83d4, 0x11);
 187         VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) | 0x30);
 188
 189         return 0;
 190 }
 191
 192 void via_disable_vblank(struct drm_device *dev, int crtc)
 193 {
 194         drm_via_private_t *dev_priv = dev->dev_private;
 195         u32 status;
 196
 197         status = VIA_READ(VIA_REG_INTERRUPT);
 198         VIA_WRITE(VIA_REG_INTERRUPT, status & ~VIA_IRQ_VBLANK_ENABLE);
 199
 200         VIA_WRITE8(0x83d4, 0x11);
 201         VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) & ~0x30);
 202
 203         if (crtc != 0)
 204                 DRM_ERROR("%s:  bad crtc %d\n", __func__, crtc);
 205 }
 206
 207 static int
 208 via_driver_irq_wait(struct drm_device *dev, unsigned int irq, int force_sequence,
 209                     unsigned int *sequence)
 210 {
 211         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 212         unsigned int cur_irq_sequence;
 213         drm_via_irq_t *cur_irq;
 214         int ret = 0;
 215         maskarray_t *masks;
 216         int real_irq;
 217
 218         DRM_DEBUG("\n");
 219
 220         if (!dev_priv) {
 221                 DRM_ERROR("called with no initialization\n");
 222                 return -EINVAL;
 223         }
 224
 225         if (irq >= drm_via_irq_num) {
 226                 DRM_ERROR("Trying to wait on unknown irq %d\n", irq);
 227                 return -EINVAL;
 228         }
 229
 230         real_irq = dev_priv->irq_map[irq];
 231
 232         if (real_irq < 0) {
 233                 DRM_ERROR("Video IRQ %d not available on this hardware.\n",
 234                           irq);
 235                 return -EINVAL;
 236         }
 237
 238         masks = dev_priv->irq_masks;
 239         cur_irq = dev_priv->via_irqs + real_irq;
 240
 241         if (masks[real_irq][2] && !force_sequence) {
 242                 DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * HZ,
 243                             ((VIA_READ(masks[irq][2]) & masks[irq][3]) ==
 244                              masks[irq][4]));
 245                 cur_irq_sequence = atomic_read(&cur_irq->irq_received);
 246         } else {
 247                 DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * HZ,
 248                             (((cur_irq_sequence =
 249                                atomic_read(&cur_irq->irq_received)) -
 250                               *sequence) <= (1 << 23)));
 251         }
 252         *sequence = cur_irq_sequence;
 253         return ret;
 254 }
 255
 256
 257 /*
 258  * drm_dma.h hooks
 259  */
 260
 261 void via_driver_irq_preinstall(struct drm_device *dev)
 262 {
 263         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 264         u32 status;
 265         drm_via_irq_t *cur_irq;
 266         int i;
 267
 268         DRM_DEBUG("dev_priv: %p\n", dev_priv);
 269         if (dev_priv) {
 270                 cur_irq = dev_priv->via_irqs;
 271
 272                 dev_priv->irq_enable_mask = VIA_IRQ_VBLANK_ENABLE;
 273                 dev_priv->irq_pending_mask = VIA_IRQ_VBLANK_PENDING;
 274
 275                 if (dev_priv->chipset == VIA_PRO_GROUP_A ||
 276                     dev_priv->chipset == VIA_DX9_0) {
 277                         dev_priv->irq_masks = via_pro_group_a_irqs;
 278                         dev_priv->num_irqs = via_num_pro_group_a;
 279                         dev_priv->irq_map = via_irqmap_pro_group_a;
 280                 } else {
 281                         dev_priv->irq_masks = via_unichrome_irqs;
 282                         dev_priv->num_irqs = via_num_unichrome;
 283                         dev_priv->irq_map = via_irqmap_unichrome;
 284                 }
 285
 286                 for (i = 0; i < dev_priv->num_irqs; ++i) {
 287                         atomic_set(&cur_irq->irq_received, 0);
 288                         cur_irq->enable_mask = dev_priv->irq_masks[i][0];
 289                         cur_irq->pending_mask = dev_priv->irq_masks[i][1];
 290                         init_waitqueue_head(&cur_irq->irq_queue);
 291                         dev_priv->irq_enable_mask |= cur_irq->enable_mask;
 292                         dev_priv->irq_pending_mask |= cur_irq->pending_mask;
 293                         cur_irq++;
 294
 295                         DRM_DEBUG("Initializing IRQ %d\n", i);
 296                 }
 297
 298                 dev_priv->last_vblank_valid = 0;
 299
 300                 /* Clear VSync interrupt regs */
 301                 status = VIA_READ(VIA_REG_INTERRUPT);
 302                 VIA_WRITE(VIA_REG_INTERRUPT, status &
 303                           ~(dev_priv->irq_enable_mask));
 304
 305                 /* Clear bits if they're already high */
 306                 viadrv_acknowledge_irqs(dev_priv);
 307         }
 308 }
 309
 310 int via_driver_irq_postinstall(struct drm_device *dev)
 311 {
 312         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 313         u32 status;
 314
 315         DRM_DEBUG("via_driver_irq_postinstall\n");
 316         if (!dev_priv)
 317                 return -EINVAL;
 318
 319         status = VIA_READ(VIA_REG_INTERRUPT);
 320         VIA_WRITE(VIA_REG_INTERRUPT, status | VIA_IRQ_GLOBAL
 321                   | dev_priv->irq_enable_mask);
 322
 323         /* Some magic, oh for some data sheets ! */
 324         VIA_WRITE8(0x83d4, 0x11);
 325         VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) | 0x30);
 326
 327         return 0;
 328 }
 329
 330 void via_driver_irq_uninstall(struct drm_device *dev)
 331 {
 332         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 333         u32 status;
 334
 335         DRM_DEBUG("\n");
 336         if (dev_priv) {
 337
 338                 /* Some more magic, oh for some data sheets ! */
 339
 340                 VIA_WRITE8(0x83d4, 0x11);
 341                 VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) & ~0x30);
 342
 343                 status = VIA_READ(VIA_REG_INTERRUPT);
 344                 VIA_WRITE(VIA_REG_INTERRUPT, status &
 345                           ~(VIA_IRQ_VBLANK_ENABLE | dev_priv->irq_enable_mask));
 346         }
 347 }
 348
 349 int via_wait_irq(struct drm_device *dev, void *data, struct drm_file *file_priv)
 350 {
 351         drm_via_irqwait_t *irqwait = data;
 352         struct timeval now;
 353         int ret = 0;
 354         drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
 355         drm_via_irq_t *cur_irq = dev_priv->via_irqs;
 356         int force_sequence;
 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 +=
 369                         atomic_read(&cur_irq->irq_received);
 370                 irqwait->request.type &= ~_DRM_VBLANK_RELATIVE;
 371         case VIA_IRQ_ABSOLUTE:
 372                 break;
 373         default:
 374                 return -EINVAL;
 375         }
 376
 377         if (irqwait->request.type & VIA_IRQ_SIGNAL) {
 378                 DRM_ERROR("Signals on Via IRQs not implemented yet.\n");
 379                 return -EINVAL;
 380         }
 381
 382         force_sequence = (irqwait->request.type & VIA_IRQ_FORCE_SEQUENCE);
 383
 384         ret = via_driver_irq_wait(dev, irqwait->request.irq, force_sequence,
 385                                   &irqwait->request.sequence);
 386         do_gettimeofday(&now);
 387         irqwait->reply.tval_sec = now.tv_sec;
 388         irqwait->reply.tval_usec = now.tv_usec;
 389
 390         return ret;
 391 }