mga_irq.c revision b5e89ed53ed8d24f83ba1941c07382af00ed238e
11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* mga_irq.c -- IRQ handling for radeon -*- linux-c -*- 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copyright (C) The Weather Channel, Inc. 2002. All Rights Reserved. 4b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie * 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The Weather Channel (TM) funded Tungsten Graphics to develop the 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * initial release of the Radeon 8500 driver under the XFree86 license. 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This notice must be preserved. 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Permission is hereby granted, free of charge, to any person obtaining a 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * copy of this software and associated documentation files (the "Software"), 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * to deal in the Software without restriction, including without limitation 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the rights to use, copy, modify, merge, publish, distribute, sublicense, 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * and/or sell copies of the Software, and to permit persons to whom the 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Software is furnished to do so, subject to the following conditions: 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The above copyright notice and this permission notice (including the next 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * paragraph) shall be included in all copies or substantial portions of the 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Software. 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * DEALINGS IN THE SOFTWARE. 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Authors: 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Keith Whitwell <keith@tungstengraphics.com> 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Eric Anholt <anholt@FreeBSD.org> 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "drmP.h" 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "drm.h" 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "mga_drm.h" 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "mga_drv.h" 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 38b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlieirqreturn_t mga_driver_irq_handler(DRM_IRQ_ARGS) 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds drm_device_t *dev = (drm_device_t *) arg; 41b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int status; 436795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie int handled = 0; 446795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 456795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie status = MGA_READ(MGA_STATUS); 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* VBLANK interrupt */ 48b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie if (status & MGA_VLINEPEN) { 49b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie MGA_WRITE(MGA_ICLEAR, MGA_VLINEICLR); 501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds atomic_inc(&dev->vbl_received); 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DRM_WAKEUP(&dev->vbl_queue); 526795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie drm_vbl_send_signals(dev); 536795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie handled = 1; 546795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie } 556795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 566795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie /* SOFTRAP interrupt */ 576795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie if (status & MGA_SOFTRAPEN) { 586795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie const u32 prim_start = MGA_READ(MGA_PRIMADDRESS); 59b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie const u32 prim_end = MGA_READ(MGA_PRIMEND); 606795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 616795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie MGA_WRITE(MGA_ICLEAR, MGA_SOFTRAPICLR); 626795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 636795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie /* In addition to clearing the interrupt-pending bit, we 646795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie * have to write to MGA_PRIMEND to re-start the DMA operation. 656795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie */ 66b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie if ((prim_start & ~0x03) != (prim_end & ~0x03)) { 676795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie MGA_WRITE(MGA_PRIMEND, prim_end); 686795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie } 696795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 706795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie atomic_inc(&dev_priv->last_fence_retired); 716795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie DRM_WAKEUP(&dev_priv->fence_queue); 726795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie handled = 1; 736795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie } 746795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 75b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie if (handled) { 761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return IRQ_HANDLED; 771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return IRQ_NONE; 791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 81b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlieint mga_driver_vblank_wait(drm_device_t * dev, unsigned int *sequence) 821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int cur_vblank; 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ret = 0; 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Assume that the user has missed the current sequence number 871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * by about a day rather than she wants to wait for years 88b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie * using vertical blanks... 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 90b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ, 91b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie (((cur_vblank = atomic_read(&dev->vbl_received)) 92b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie - *sequence) <= (1 << 23))); 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *sequence = cur_vblank; 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ret; 971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 996795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlieint mga_driver_fence_wait(drm_device_t * dev, unsigned int *sequence) 1006795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie{ 1016795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 1026795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie unsigned int cur_fence; 1036795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie int ret = 0; 1046795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 1056795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie /* Assume that the user has missed the current sequence number 1066795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie * by about a day rather than she wants to wait for years 1076795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie * using fences. 1086795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie */ 1096795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie DRM_WAIT_ON(ret, dev_priv->fence_queue, 3 * DRM_HZ, 1106795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie (((cur_fence = atomic_read(&dev_priv->last_fence_retired)) 1116795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie - *sequence) <= (1 << 23))); 1126795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 1136795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie *sequence = cur_fence; 1146795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 1156795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie return ret; 1166795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie} 1176795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 1186795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlievoid mga_driver_irq_preinstall(drm_device_t * dev) 1196795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie{ 1206795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Disable *all* interrupts */ 123b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie MGA_WRITE(MGA_IEN, 0); 1241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Clear bits if they're already high */ 125b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie MGA_WRITE(MGA_ICLEAR, ~0); 1261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1286795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlievoid mga_driver_irq_postinstall(drm_device_t * dev) 1296795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie{ 1306795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 1316795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 132b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie DRM_INIT_WAITQUEUE(&dev_priv->fence_queue); 1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1346795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie /* Turn on vertical blank interrupt and soft trap interrupt. */ 1356795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); 1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 138b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlievoid mga_driver_irq_uninstall(drm_device_t * dev) 139b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie{ 140b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!dev_priv) 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return; 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Disable *all* interrupts */ 1456795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie MGA_WRITE(MGA_IEN, 0); 146b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie 1476795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie dev->irq_enabled = 0; 1481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 149