mga_irq.c revision ac741ab71bb39e6977694ac0cc26678d8673cda4
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 38ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnesu32 mga_get_vblank_counter(struct drm_device *dev, int crtc) 39ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes{ 40ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes const drm_mga_private_t *const dev_priv = 41ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes (drm_mga_private_t *) dev->dev_private; 42ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes 43ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes if (crtc != 0) { 44ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes return 0; 45ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes } 46ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes 47ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes 48ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes return atomic_read(&dev_priv->vbl_received); 49ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes} 50ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes 51ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes 52b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlieirqreturn_t mga_driver_irq_handler(DRM_IRQ_ARGS) 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 54eddca551a3e7be2fed54282f255f18efe9ead131Dave Airlie struct drm_device *dev = (struct drm_device *) arg; 55b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int status; 576795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie int handled = 0; 586795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 596795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie status = MGA_READ(MGA_STATUS); 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* VBLANK interrupt */ 62b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie if (status & MGA_VLINEPEN) { 63b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie MGA_WRITE(MGA_ICLEAR, MGA_VLINEICLR); 64ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes atomic_inc(&dev_priv->vbl_received); 65ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes drm_handle_vblank(dev, 0); 666795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie handled = 1; 676795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie } 686795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 696795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie /* SOFTRAP interrupt */ 706795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie if (status & MGA_SOFTRAPEN) { 716795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie const u32 prim_start = MGA_READ(MGA_PRIMADDRESS); 72b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie const u32 prim_end = MGA_READ(MGA_PRIMEND); 736795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 746795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie MGA_WRITE(MGA_ICLEAR, MGA_SOFTRAPICLR); 756795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 766795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie /* In addition to clearing the interrupt-pending bit, we 776795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie * have to write to MGA_PRIMEND to re-start the DMA operation. 786795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie */ 79b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie if ((prim_start & ~0x03) != (prim_end & ~0x03)) { 806795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie MGA_WRITE(MGA_PRIMEND, prim_end); 816795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie } 826795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 836795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie atomic_inc(&dev_priv->last_fence_retired); 846795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie DRM_WAKEUP(&dev_priv->fence_queue); 856795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie handled = 1; 866795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie } 876795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 88b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie if (handled) { 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return IRQ_HANDLED; 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return IRQ_NONE; 921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 94ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnesint mga_enable_vblank(struct drm_device *dev, int crtc) 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 96ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 98ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes if (crtc != 0) { 99ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes DRM_ERROR("tried to enable vblank on non-existent crtc %d\n", 100ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes crtc); 101ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes return 0; 102ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes } 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 104ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); 105ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes return 0; 106ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes} 1071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 108ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes 109ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnesvoid mga_disable_vblank(struct drm_device *dev, int crtc) 110ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes{ 111ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes if (crtc != 0) { 112ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes DRM_ERROR("tried to disable vblank on non-existent crtc %d\n", 113ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes crtc); 114ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes } 115ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes 116ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes /* Do *NOT* disable the vertical refresh interrupt. MGA doesn't have 117ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes * a nice hardware counter that tracks the number of refreshes when 118ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes * the interrupt is disabled, and the kernel doesn't know the refresh 119ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes * rate to calculate an estimate. 120ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes */ 121ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes /* MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); */ 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 124eddca551a3e7be2fed54282f255f18efe9ead131Dave Airlieint mga_driver_fence_wait(struct drm_device * dev, unsigned int *sequence) 1256795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie{ 1266795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 1276795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie unsigned int cur_fence; 1286795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie int ret = 0; 1296795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 1306795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie /* Assume that the user has missed the current sequence number 1316795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie * by about a day rather than she wants to wait for years 1326795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie * using fences. 1336795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie */ 1346795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie DRM_WAIT_ON(ret, dev_priv->fence_queue, 3 * DRM_HZ, 1356795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie (((cur_fence = atomic_read(&dev_priv->last_fence_retired)) 1366795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie - *sequence) <= (1 << 23))); 1376795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 1386795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie *sequence = cur_fence; 1396795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 1406795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie return ret; 1416795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie} 1426795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 143eddca551a3e7be2fed54282f255f18efe9ead131Dave Airlievoid mga_driver_irq_preinstall(struct drm_device * dev) 1446795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie{ 1456795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 1461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Disable *all* interrupts */ 148b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie MGA_WRITE(MGA_IEN, 0); 1491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Clear bits if they're already high */ 150b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie MGA_WRITE(MGA_ICLEAR, ~0); 1511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 153ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnesint mga_driver_irq_postinstall(struct drm_device * dev) 1546795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie{ 1556795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 156ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes int ret; 157ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes 158ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes ret = drm_vblank_init(dev, 1); 159ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes if (ret) 160ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes return ret; 1616795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 162b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie DRM_INIT_WAITQUEUE(&dev_priv->fence_queue); 1631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 164ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes /* Turn on soft trap interrupt. Vertical blank interrupts are enabled 165ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes * in mga_enable_vblank. 166ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes */ 167ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes MGA_WRITE(MGA_IEN, MGA_SOFTRAPEN); 168ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes return 0; 1691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 171eddca551a3e7be2fed54282f255f18efe9ead131Dave Airlievoid mga_driver_irq_uninstall(struct drm_device * dev) 172b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie{ 173b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!dev_priv) 1751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return; 1761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Disable *all* interrupts */ 1786795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie MGA_WRITE(MGA_IEN, 0); 179b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie 1806795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie dev->irq_enabled = 0; 1811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 182