LXR linux/drivers/gpu/drm/radeon/radeon

   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
  38void 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
  51static 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
  64int 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_RS600) {
  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
  99void 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_RS600) {
 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
 132static 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_RS600) {
 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
 183irqreturn_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        if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_R600)
 192                return IRQ_NONE;
 193
 194        /* Only consider the bits we're interested in - others could be used
 195         * outside the DRM
 196         */
 197        stat = radeon_acknowledge_irqs(dev_priv, &r500_disp_int);
 198        if (!stat)
 199                return IRQ_NONE;
 200
 201        stat &= dev_priv->irq_enable_reg;
 202
 203        /* SW interrupt */
 204        if (stat & RADEON_SW_INT_TEST)
 205                DRM_WAKEUP(&dev_priv->swi_queue);
 206
 207        /* VBLANK interrupt */
 208        if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_RS600) {
 209                if (r500_disp_int & R500_D1_VBLANK_INTERRUPT)
 210                        drm_handle_vblank(dev, 0);
 211                if (r500_disp_int & R500_D2_VBLANK_INTERRUPT)
 212                        drm_handle_vblank(dev, 1);
 213        } else {
 214                if (stat & RADEON_CRTC_VBLANK_STAT)
 215                        drm_handle_vblank(dev, 0);
 216                if (stat & RADEON_CRTC2_VBLANK_STAT)
 217                        drm_handle_vblank(dev, 1);
 218        }
 219        return IRQ_HANDLED;
 220}
 221
 222static int radeon_emit_irq(struct drm_device * dev)
 223{
 224        drm_radeon_private_t *dev_priv = dev->dev_private;
 225        unsigned int ret;
 226        RING_LOCALS;
 227
 228        atomic_inc(&dev_priv->swi_emitted);
 229        ret = atomic_read(&dev_priv->swi_emitted);
 230
 231        BEGIN_RING(4);
 232        OUT_RING_REG(RADEON_LAST_SWI_REG, ret);
 233        OUT_RING_REG(RADEON_GEN_INT_STATUS, RADEON_SW_INT_FIRE);
 234        ADVANCE_RING();
 235        COMMIT_RING();
 236
 237        return ret;
 238}
 239
 240static int radeon_wait_irq(struct drm_device * dev, int swi_nr)
 241{
 242        drm_radeon_private_t *dev_priv =
 243            (drm_radeon_private_t *) dev->dev_private;
 244        int ret = 0;
 245
 246        if (RADEON_READ(RADEON_LAST_SWI_REG) >= swi_nr)
 247                return 0;
 248
 249        dev_priv->stats.boxes |= RADEON_BOX_WAIT_IDLE;
 250
 251        DRM_WAIT_ON(ret, dev_priv->swi_queue, 3 * DRM_HZ,
 252                    RADEON_READ(RADEON_LAST_SWI_REG) >= swi_nr);
 253
 254        return ret;
 255}
 256
 257u32 radeon_get_vblank_counter(struct drm_device *dev, int crtc)
 258{
 259        drm_radeon_private_t *dev_priv = dev->dev_private;
 260
 261        if (!dev_priv) {
 262                DRM_ERROR("called with no initialization\n");
 263                return -EINVAL;
 264        }
 265
 266        if (crtc < 0 || crtc > 1) {
 267                DRM_ERROR("Invalid crtc %d\n", crtc);
 268                return -EINVAL;
 269        }
 270
 271        if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_RS600) {
 272                if (crtc == 0)
 273                        return RADEON_READ(R500_D1CRTC_FRAME_COUNT);
 274                else
 275                        return RADEON_READ(R500_D2CRTC_FRAME_COUNT);
 276        } else {
 277                if (crtc == 0)
 278                        return RADEON_READ(RADEON_CRTC_CRNT_FRAME);
 279                else
 280                        return RADEON_READ(RADEON_CRTC2_CRNT_FRAME);
 281        }
 282}
 283
 284/* Needs the lock as it touches the ring.
 285 */
 286int radeon_irq_emit(struct drm_device *dev, void *data, struct drm_file *file_priv)
 287{
 288        drm_radeon_private_t *dev_priv = dev->dev_private;
 289        drm_radeon_irq_emit_t *emit = data;
 290        int result;
 291
 292        if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_R600)
 293                return -EINVAL;
 294
 295        LOCK_TEST_WITH_RETURN(dev, file_priv);
 296
 297        if (!dev_priv) {
 298                DRM_ERROR("called with no initialization\n");
 299                return -EINVAL;
 300        }
 301
 302        result = radeon_emit_irq(dev);
 303
 304        if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
 305                DRM_ERROR("copy_to_user\n");
 306                return -EFAULT;
 307        }
 308
 309        return 0;
 310}
 311
 312/* Doesn't need the hardware lock.
 313 */
 314int radeon_irq_wait(struct drm_device *dev, void *data, struct drm_file *file_priv)
 315{
 316        drm_radeon_private_t *dev_priv = dev->dev_private;
 317        drm_radeon_irq_wait_t *irqwait = data;
 318
 319        if (!dev_priv) {
 320                DRM_ERROR("called with no initialization\n");
 321                return -EINVAL;
 322        }
 323
 324        if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_R600)
 325                return -EINVAL;
 326
 327        return radeon_wait_irq(dev, irqwait->irq_seq);
 328}
 329
 330/* drm_dma.h hooks
 331*/
 332void radeon_driver_irq_preinstall(struct drm_device * dev)
 333{
 334        drm_radeon_private_t *dev_priv =
 335            (drm_radeon_private_t *) dev->dev_private;
 336        u32 dummy;
 337
 338        if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_R600)
 339                return;
 340
 341        /* Disable *all* interrupts */
 342        if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_RS600)
 343                RADEON_WRITE(R500_DxMODE_INT_MASK, 0);
 344        RADEON_WRITE(RADEON_GEN_INT_CNTL, 0);
 345
 346        /* Clear bits if they're already high */
 347        radeon_acknowledge_irqs(dev_priv, &dummy);
 348}
 349
 350int radeon_driver_irq_postinstall(struct drm_device *dev)
 351{
 352        drm_radeon_private_t *dev_priv =
 353            (drm_radeon_private_t *) dev->dev_private;
 354
 355        atomic_set(&dev_priv->swi_emitted, 0);
 356        DRM_INIT_WAITQUEUE(&dev_priv->swi_queue);
 357
 358        dev->max_vblank_count = 0x001fffff;
 359
 360        if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_R600)
 361                return 0;
 362
 363        radeon_irq_set_state(dev, RADEON_SW_INT_ENABLE, 1);
 364
 365        return 0;
 366}
 367
 368void radeon_driver_irq_uninstall(struct drm_device * dev)
 369{
 370        drm_radeon_private_t *dev_priv =
 371            (drm_radeon_private_t *) dev->dev_private;
 372        if (!dev_priv)
 373                return;
 374
 375        if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_R600)
 376                return;
 377
 378        if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_RS600)
 379                RADEON_WRITE(R500_DxMODE_INT_MASK, 0);
 380        /* Disable *all* interrupts */
 381        RADEON_WRITE(RADEON_GEN_INT_CNTL, 0);
 382}
 383
 384
 385int radeon_vblank_crtc_get(struct drm_device *dev)
 386{
 387        drm_radeon_private_t *dev_priv = (drm_radeon_private_t *) dev->dev_private;
 388
 389        return dev_priv->vblank_crtc;
 390}
 391
 392int radeon_vblank_crtc_set(struct drm_device *dev, int64_t value)
 393{
 394        drm_radeon_private_t *dev_priv = (drm_radeon_private_t *) dev->dev_private;
 395        if (value & ~(DRM_RADEON_VBLANK_CRTC1 | DRM_RADEON_VBLANK_CRTC2)) {
 396                DRM_ERROR("called with invalid crtc 0x%x\n", (unsigned int)value);
 397                return -EINVAL;
 398        }
 399        dev_priv->vblank_crtc = (unsigned int)value;
 400        return 0;
 401}
 402