drivers/gpu/drm/radeon/radeon_irq.c

   1 /* radeon_irq.c -- IRQ handling for radeon -*- linux-c -*- */
   2 /*
   3  * Copyright (C) The Weather Channel, Inc.  2002.  All Rights Reserved.
   4  *
   5  * The Weather Channel (TM) funded Tungsten Graphics to develop the
   6  * initial release of the Radeon 8500 driver under the XFree86 license.
   7  * This notice must be preserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice (including the next
  17  * paragraph) shall be included in all copies or substantial portions of the
  18  * Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  23  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 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  *    Keith Whitwell <keith@tungstengraphics.com>
  30  *    Michel D�zer <michel@daenzer.net>
  31  */
  32
  33 #include "drmP.h"
  34 #include "drm.h"
  35 #include "radeon_drm.h"
  36 #include "radeon_drv.h"
  37
  38 void radeon_irq_set_state(struct drm_device *dev, u32 mask, int state)
  39 {
  40         drm_radeon_private_t *dev_priv = dev->dev_private;
  41
  42         if (state)
  43                 dev_priv->irq_enable_reg |= mask;
  44         else
  45                 dev_priv->irq_enable_reg &= ~mask;
  46
  47         if (!dev->irq_enabled)
  48                 RADEON_WRITE(RADEON_GEN_INT_CNTL, dev_priv->irq_enable_reg);
  49 }
  50
  51 static void r500_vbl_irq_set_state(struct drm_device *dev, u32 mask, int state)
  52 {
  53         drm_radeon_private_t *dev_priv = dev->dev_private;
  54
  55         if (state)
  56                 dev_priv->r500_disp_irq_reg |= mask;
  57         else
  58                 dev_priv->r500_disp_irq_reg &= ~mask;
  59
  60         if (!dev->irq_enabled)
  61                 RADEON_WRITE(R500_DxMODE_INT_MASK, dev_priv->r500_disp_irq_reg);
  62 }
  63
  64 int radeon_enable_vblank(struct drm_device *dev, int crtc)
  65 {
  66         drm_radeon_private_t *dev_priv = dev->dev_private;
  67
  68         if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_RS690) {
  69                 switch (crtc) {
  70                 case 0:
  71                         r500_vbl_irq_set_state(dev, R500_D1MODE_INT_MASK, 1);
  72                         break;
  73                 case 1:
  74                         r500_vbl_irq_set_state(dev, R500_D2MODE_INT_MASK, 1);
  75                         break;
  76                 default:
  77                         DRM_ERROR("tried to enable vblank on non-existent crtc %d\n",
  78                                   crtc);
  79                         return EINVAL;
  80                 }
  81         } else {
  82                 switch (crtc) {
  83                 case 0:
  84                         radeon_irq_set_state(dev, RADEON_CRTC_VBLANK_MASK, 1);
  85                         break;
  86                 case 1:
  87                         radeon_irq_set_state(dev, RADEON_CRTC2_VBLANK_MASK, 1);
  88                         break;
  89                 default:
  90                         DRM_ERROR("tried to enable vblank on non-existent crtc %d\n",
  91                                   crtc);
  92                         return EINVAL;
  93                 }
  94         }
  95
  96         return 0;
  97 }
  98
  99 void radeon_disable_vblank(struct drm_device *dev, int crtc)
 100 {
 101         drm_radeon_private_t *dev_priv = dev->dev_private;
 102
 103         if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_RS690) {
 104                 switch (crtc) {
 105                 case 0:
 106                         r500_vbl_irq_set_state(dev, R500_D1MODE_INT_MASK, 0);
 107                         break;
 108                 case 1:
 109                         r500_vbl_irq_set_state(dev, R500_D2MODE_INT_MASK, 0);
 110                         break;
 111                 default:
 112                         DRM_ERROR("tried to enable vblank on non-existent crtc %d\n",
 113                                   crtc);
 114                         break;
 115                 }
 116         } else {
 117                 switch (crtc) {
 118                 case 0:
 119                         radeon_irq_set_state(dev, RADEON_CRTC_VBLANK_MASK, 0);
 120                         break;
 121                 case 1:
 122                         radeon_irq_set_state(dev, RADEON_CRTC2_VBLANK_MASK, 0);
 123                         break;
 124                 default:
 125                         DRM_ERROR("tried to enable vblank on non-existent crtc %d\n",
 126                                   crtc);
 127                         break;
 128                 }
 129         }
 130 }
 131
 132 static inline u32 radeon_acknowledge_irqs(drm_radeon_private_t *dev_priv, u32 *r500_disp_int)
 133 {
 134         u32 irqs = RADEON_READ(RADEON_GEN_INT_STATUS);
 135         u32 irq_mask = RADEON_SW_INT_TEST;
 136
 137         *r500_disp_int = 0;
 138         if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_RS690) {
 139                 /* vbl interrupts in a different place */
 140
 141                 if (irqs & R500_DISPLAY_INT_STATUS) {
 142                         /* if a display interrupt */
 143                         u32 disp_irq;
 144
 145                         disp_irq = RADEON_READ(R500_DISP_INTERRUPT_STATUS);
 146
 147                         *r500_disp_int = disp_irq;
 148                         if (disp_irq & R500_D1_VBLANK_INTERRUPT)
 149                                 RADEON_WRITE(R500_D1MODE_VBLANK_STATUS, R500_VBLANK_ACK);
 150                         if (disp_irq & R500_D2_VBLANK_INTERRUPT)
 151                                 RADEON_WRITE(R500_D2MODE_VBLANK_STATUS, R500_VBLANK_ACK);
 152                 }
 153                 irq_mask |= R500_DISPLAY_INT_STATUS;
 154         } else
 155                 irq_mask |= RADEON_CRTC_VBLANK_STAT | RADEON_CRTC2_VBLANK_STAT;
 156
 157         irqs &= irq_mask;
 158
 159         if (irqs)
 160                 RADEON_WRITE(RADEON_GEN_INT_STATUS, irqs);
 161
 162         return irqs;
 163 }
 164
 165 /* Interrupts - Used for device synchronization and flushing in the
 166  * following circumstances:
 167  *
 168  * - Exclusive FB access with hw idle:
 169  *    - Wait for GUI Idle (?) interrupt, then do normal flush.
 170  *
 171  * - Frame throttling, NV_fence:
 172  *    - Drop marker irq's into command stream ahead of time.
 173  *    - Wait on irq's with lock *not held*
 174  *    - Check each for termination condition
 175  *
 176  * - Internally in cp_getbuffer, etc:
 177  *    - as above, but wait with lock held???
 178  *
 179  * NOTE: These functions are misleadingly named -- the irq's aren't
 180  * tied to dma at all, this is just a hangover from dri prehistory.
 181  */
 182
 183 irqreturn_t radeon_driver_irq_handler(DRM_IRQ_ARGS)
 184 {
 185         struct drm_device *dev = (struct drm_device *) arg;
 186         drm_radeon_private_t *dev_priv =
 187             (drm_radeon_private_t *) dev->dev_private;
 188         u32 stat;
 189         u32 r500_disp_int;
 190
 191         /* Only consider the bits we're interested in - others could be used
 192          * outside the DRM
 193          */
 194         stat = radeon_acknowledge_irqs(dev_priv, &r500_disp_int);
 195         if (!stat)
 196                 return IRQ_NONE;
 197
 198         stat &= dev_priv->irq_enable_reg;
 199
 200         /* SW interrupt */
 201         if (stat & RADEON_SW_INT_TEST)
 202                 DRM_WAKEUP(&dev_priv->swi_queue);
 203
 204         /* VBLANK interrupt */
 205         if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_RS690) {
 206                 if (r500_disp_int & R500_D1_VBLANK_INTERRUPT)
 207                         drm_handle_vblank(dev, 0);
 208                 if (r500_disp_int & R500_D2_VBLANK_INTERRUPT)
 209                         drm_handle_vblank(dev, 1);
 210         } else {
 211                 if (stat & RADEON_CRTC_VBLANK_STAT)
 212                         drm_handle_vblank(dev, 0);
 213                 if (stat & RADEON_CRTC2_VBLANK_STAT)
 214                         drm_handle_vblank(dev, 1);
 215         }
 216         return IRQ_HANDLED;
 217 }
 218
 219 static int radeon_emit_irq(struct drm_device * dev)
 220 {
 221         drm_radeon_private_t *dev_priv = dev->dev_private;
 222         unsigned int ret;
 223         RING_LOCALS;
 224
 225         atomic_inc(&dev_priv->swi_emitted);
 226         ret = atomic_read(&dev_priv->swi_emitted);
 227
 228         BEGIN_RING(4);
 229         OUT_RING_REG(RADEON_LAST_SWI_REG, ret);
 230         OUT_RING_REG(RADEON_GEN_INT_STATUS, RADEON_SW_INT_FIRE);
 231         ADVANCE_RING();
 232         COMMIT_RING();
 233
 234         return ret;
 235 }
 236
 237 static int radeon_wait_irq(struct drm_device * dev, int swi_nr)
 238 {
 239         drm_radeon_private_t *dev_priv =
 240             (drm_radeon_private_t *) dev->dev_private;
 241         int ret = 0;
 242
 243         if (RADEON_READ(RADEON_LAST_SWI_REG) >= swi_nr)
 244                 return 0;
 245
 246         dev_priv->stats.boxes |= RADEON_BOX_WAIT_IDLE;
 247
 248         DRM_WAIT_ON(ret, dev_priv->swi_queue, 3 * DRM_HZ,
 249                     RADEON_READ(RADEON_LAST_SWI_REG) >= swi_nr);
 250
 251         return ret;
 252 }
 253
 254 u32 radeon_get_vblank_counter(struct drm_device *dev, int crtc)
 255 {
 256         drm_radeon_private_t *dev_priv = dev->dev_private;
 257
 258         if (!dev_priv) {
 259                 DRM_ERROR("called with no initialization\n");
 260                 return -EINVAL;
 261         }
 262
 263         if (crtc < 0 || crtc > 1) {
 264                 DRM_ERROR("Invalid crtc %d\n", crtc);
 265                 return -EINVAL;
 266         }
 267
 268         if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_RS690) {
 269                 if (crtc == 0)
 270                         return RADEON_READ(R500_D1CRTC_FRAME_COUNT);
 271                 else
 272                         return RADEON_READ(R500_D2CRTC_FRAME_COUNT);
 273         } else {
 274                 if (crtc == 0)
 275                         return RADEON_READ(RADEON_CRTC_CRNT_FRAME);
 276                 else
 277                         return RADEON_READ(RADEON_CRTC2_CRNT_FRAME);
 278         }
 279 }
 280
 281 /* Needs the lock as it touches the ring.
 282  */
 283 int radeon_irq_emit(struct drm_device *dev, void *data, struct drm_file *file_priv)
 284 {
 285         drm_radeon_private_t *dev_priv = dev->dev_private;
 286         drm_radeon_irq_emit_t *emit = data;
 287         int result;
 288
 289         LOCK_TEST_WITH_RETURN(dev, file_priv);
 290
 291         if (!dev_priv) {
 292                 DRM_ERROR("called with no initialization\n");
 293                 return -EINVAL;
 294         }
 295
 296         result = radeon_emit_irq(dev);
 297
 298         if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
 299                 DRM_ERROR("copy_to_user\n");
 300                 return -EFAULT;
 301         }
 302
 303         return 0;
 304 }
 305
 306 /* Doesn't need the hardware lock.
 307  */
 308 int radeon_irq_wait(struct drm_device *dev, void *data, struct drm_file *file_priv)
 309 {
 310         drm_radeon_private_t *dev_priv = dev->dev_private;
 311         drm_radeon_irq_wait_t *irqwait = data;
 312
 313         if (!dev_priv) {
 314                 DRM_ERROR("called with no initialization\n");
 315                 return -EINVAL;
 316         }
 317
 318         return radeon_wait_irq(dev, irqwait->irq_seq);
 319 }
 320
 321 /* drm_dma.h hooks
 322 */
 323 void radeon_driver_irq_preinstall(struct drm_device * dev)
 324 {
 325         drm_radeon_private_t *dev_priv =
 326             (drm_radeon_private_t *) dev->dev_private;
 327         u32 dummy;
 328
 329         /* Disable *all* interrupts */
 330         if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_RS690)
 331                 RADEON_WRITE(R500_DxMODE_INT_MASK, 0);
 332         RADEON_WRITE(RADEON_GEN_INT_CNTL, 0);
 333
 334         /* Clear bits if they're already high */
 335         radeon_acknowledge_irqs(dev_priv, &dummy);
 336 }
 337
 338 int radeon_driver_irq_postinstall(struct drm_device *dev)
 339 {
 340         drm_radeon_private_t *dev_priv =
 341             (drm_radeon_private_t *) dev->dev_private;
 342
 343         atomic_set(&dev_priv->swi_emitted, 0);
 344         DRM_INIT_WAITQUEUE(&dev_priv->swi_queue);
 345
 346         dev->max_vblank_count = 0x001fffff;
 347
 348         radeon_irq_set_state(dev, RADEON_SW_INT_ENABLE, 1);
 349
 350         return 0;
 351 }
 352
 353 void radeon_driver_irq_uninstall(struct drm_device * dev)
 354 {
 355         drm_radeon_private_t *dev_priv =
 356             (drm_radeon_private_t *) dev->dev_private;
 357         if (!dev_priv)
 358                 return;
 359
 360         if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_RS690)
 361                 RADEON_WRITE(R500_DxMODE_INT_MASK, 0);
 362         /* Disable *all* interrupts */
 363         RADEON_WRITE(RADEON_GEN_INT_CNTL, 0);
 364 }
 365
 366
 367 int radeon_vblank_crtc_get(struct drm_device *dev)
 368 {
 369         drm_radeon_private_t *dev_priv = (drm_radeon_private_t *) dev->dev_private;
 370
 371         return dev_priv->vblank_crtc;
 372 }
 373
 374 int radeon_vblank_crtc_set(struct drm_device *dev, int64_t value)
 375 {
 376         drm_radeon_private_t *dev_priv = (drm_radeon_private_t *) dev->dev_private;
 377         if (value & ~(DRM_RADEON_VBLANK_CRTC1 | DRM_RADEON_VBLANK_CRTC2)) {
 378                 DRM_ERROR("called with invalid crtc 0x%x\n", (unsigned int)value);
 379                 return -EINVAL;
 380         }
 381         dev_priv->vblank_crtc = (unsigned int)value;
 382         return 0;
 383 }