mga_irq.c revision f2b2cb790ee873b6853ec99478d68dd9cd083132
11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* mga_irq.c -- IRQ handling for radeon -*- linux-c -*- 20a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes */ 30a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes/* 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copyright (C) The Weather Channel, Inc. 2002. All Rights Reserved. 5b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie * 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The Weather Channel (TM) funded Tungsten Graphics to develop the 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * initial release of the Radeon 8500 driver under the XFree86 license. 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This notice must be preserved. 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Permission is hereby granted, free of charge, to any person obtaining a 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * copy of this software and associated documentation files (the "Software"), 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * to deal in the Software without restriction, including without limitation 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the rights to use, copy, modify, merge, publish, distribute, sublicense, 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * and/or sell copies of the Software, and to permit persons to whom the 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Software is furnished to do so, subject to the following conditions: 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The above copyright notice and this permission notice (including the next 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * paragraph) shall be included in all copies or substantial portions of the 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Software. 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * DEALINGS IN THE SOFTWARE. 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Authors: 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Keith Whitwell <keith@tungstengraphics.com> 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Eric Anholt <anholt@FreeBSD.org> 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "drmP.h" 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "drm.h" 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "mga_drm.h" 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "mga_drv.h" 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 390a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnesu32 mga_get_vblank_counter(struct drm_device *dev, int crtc) 400a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes{ 410a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes const drm_mga_private_t *const dev_priv = 420a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes (drm_mga_private_t *) dev->dev_private; 430a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes 440a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes if (crtc != 0) 450a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes return 0; 460a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes 470a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes return atomic_read(&dev_priv->vbl_received); 480a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes} 490a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes 500a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes 51b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlieirqreturn_t mga_driver_irq_handler(DRM_IRQ_ARGS) 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 53eddca551a3e7be2fed54282f255f18efe9ead131Dave Airlie struct drm_device *dev = (struct drm_device *) arg; 54b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int status; 566795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie int handled = 0; 576795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 586795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie status = MGA_READ(MGA_STATUS); 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* VBLANK interrupt */ 61b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie if (status & MGA_VLINEPEN) { 62b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie MGA_WRITE(MGA_ICLEAR, MGA_VLINEICLR); 630a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes atomic_inc(&dev_priv->vbl_received); 640a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes drm_handle_vblank(dev, 0); 656795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie handled = 1; 666795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie } 676795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 686795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie /* SOFTRAP interrupt */ 696795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie if (status & MGA_SOFTRAPEN) { 706795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie const u32 prim_start = MGA_READ(MGA_PRIMADDRESS); 71b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie const u32 prim_end = MGA_READ(MGA_PRIMEND); 726795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 730a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes 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 */ 79f2b2cb790ee873b6853ec99478d68dd9cd083132Nicolas Kaiser if ((prim_start & ~0x03) != (prim_end & ~0x03)) 806795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie MGA_WRITE(MGA_PRIMEND, prim_end); 816795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 826795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie atomic_inc(&dev_priv->last_fence_retired); 836795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie DRM_WAKEUP(&dev_priv->fence_queue); 846795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie handled = 1; 856795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie } 866795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 870a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes if (handled) 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return IRQ_HANDLED; 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return IRQ_NONE; 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 920a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnesint mga_enable_vblank(struct drm_device *dev, int crtc) 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 940a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 960a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes if (crtc != 0) { 970a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes DRM_ERROR("tried to enable vblank on non-existent crtc %d\n", 980a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes crtc); 990a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes return 0; 1000a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes } 101ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes 1020a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); 1030a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes return 0; 1040a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes} 105ac741ab71bb39e6977694ac0cc26678d8673cda4Jesse Barnes 1060a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes 1070a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnesvoid mga_disable_vblank(struct drm_device *dev, int crtc) 1080a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes{ 1090a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes if (crtc != 0) { 1100a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes DRM_ERROR("tried to disable vblank on non-existent crtc %d\n", 1110a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes crtc); 1120a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes } 1130a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes 1140a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes /* Do *NOT* disable the vertical refresh interrupt. MGA doesn't have 1150a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes * a nice hardware counter that tracks the number of refreshes when 1160a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes * the interrupt is disabled, and the kernel doesn't know the refresh 1170a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes * rate to calculate an estimate. 1180a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes */ 1190a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes /* MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); */ 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 122f2b2cb790ee873b6853ec99478d68dd9cd083132Nicolas Kaiserint mga_driver_fence_wait(struct drm_device *dev, unsigned int *sequence) 1236795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie{ 1246795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 1256795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie unsigned int cur_fence; 1266795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie int ret = 0; 1276795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 1286795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie /* Assume that the user has missed the current sequence number 1296795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie * by about a day rather than she wants to wait for years 1306795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie * using fences. 1316795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie */ 1326795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie DRM_WAIT_ON(ret, dev_priv->fence_queue, 3 * DRM_HZ, 1336795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie (((cur_fence = atomic_read(&dev_priv->last_fence_retired)) 1346795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie - *sequence) <= (1 << 23))); 1356795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 1366795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie *sequence = cur_fence; 1376795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 1386795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie return ret; 1396795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie} 1406795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 141f2b2cb790ee873b6853ec99478d68dd9cd083132Nicolas Kaiservoid mga_driver_irq_preinstall(struct drm_device *dev) 1426795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie{ 1436795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Disable *all* interrupts */ 146b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie MGA_WRITE(MGA_IEN, 0); 1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Clear bits if they're already high */ 148b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie MGA_WRITE(MGA_ICLEAR, ~0); 1491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1510a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnesint mga_driver_irq_postinstall(struct drm_device *dev) 1526795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie{ 1536795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 1546795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie 155b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie DRM_INIT_WAITQUEUE(&dev_priv->fence_queue); 1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1570a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes /* Turn on soft trap interrupt. Vertical blank interrupts are enabled 1580a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes * in mga_enable_vblank. 1590a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes */ 1600a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes MGA_WRITE(MGA_IEN, MGA_SOFTRAPEN); 1610a3e67a4caac273a3bfc4ced3da364830b1ab241Jesse Barnes return 0; 1621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 164f2b2cb790ee873b6853ec99478d68dd9cd083132Nicolas Kaiservoid mga_driver_irq_uninstall(struct drm_device *dev) 165b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie{ 166b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 1671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!dev_priv) 1681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return; 1691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Disable *all* interrupts */ 1716795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie MGA_WRITE(MGA_IEN, 0); 172b5e89ed53ed8d24f83ba1941c07382af00ed238eDave Airlie 1736795c985a648d1e90b367cc1387c18205ecca4b8Dave Airlie dev->irq_enabled = 0; 1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 175