/* * drivers/gpu/drm/omapdrm/omap_irq.c * * Copyright (C) 2012 Texas Instruments * Author: Rob Clark <rob.clark@linaro.org> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program. If not, see <http://www.gnu.org/licenses/>. */ #include "omap_drv.h" static DEFINE_SPINLOCK(list_lock); static void omap_irq_error_handler(struct omap_drm_irq *irq, uint32_t irqstatus) { DRM_ERROR("errors: %08x\n", irqstatus); } /* call with list_lock and dispc runtime held */ static void omap_irq_update(struct drm_device *dev) { struct omap_drm_private *priv = dev->dev_private; struct omap_drm_irq *irq; uint32_t irqmask = priv->vblank_mask; BUG_ON(!spin_is_locked(&list_lock)); list_for_each_entry(irq, &priv->irq_list, node) irqmask |= irq->irqmask; DBG("irqmask=%08x", irqmask); dispc_write_irqenable(irqmask); dispc_read_irqenable(); /* flush posted write */ } void omap_irq_register(struct drm_device *dev, struct omap_drm_irq *irq) { struct omap_drm_private *priv = dev->dev_private; unsigned long flags; dispc_runtime_get(); spin_lock_irqsave(&list_lock, flags); if (!WARN_ON(irq->registered)) { irq->registered = true; list_add(&irq->node, &priv->irq_list); omap_irq_update(dev); } spin_unlock_irqrestore(&list_lock, flags); dispc_runtime_put(); } void omap_irq_unregister(struct drm_device *dev, struct omap_drm_irq *irq) { unsigned long flags; dispc_runtime_get(); spin_lock_irqsave(&list_lock, flags); if (!WARN_ON(!irq->registered)) { irq->registered = false; list_del(&irq->node); omap_irq_update(dev); } spin_unlock_irqrestore(&list_lock, flags); dispc_runtime_put(); } struct omap_irq_wait { struct omap_drm_irq irq; int count; }; static DECLARE_WAIT_QUEUE_HEAD(wait_event); static void wait_irq(struct omap_drm_irq *irq, uint32_t irqstatus) { struct omap_irq_wait *wait = container_of(irq, struct omap_irq_wait, irq); wait->count--; wake_up_all(&wait_event); } struct omap_irq_wait * omap_irq_wait_init(struct drm_device *dev, uint32_t irqmask, int count) { struct omap_irq_wait *wait = kzalloc(sizeof(*wait), GFP_KERNEL); wait->irq.irq = wait_irq; wait->irq.irqmask = irqmask; wait->count = count; omap_irq_register(dev, &wait->irq); return wait; } int omap_irq_wait(struct drm_device *dev, struct omap_irq_wait *wait, unsigned long timeout) { int ret = wait_event_timeout(wait_event, (wait->count <= 0), timeout); omap_irq_unregister(dev, &wait->irq); kfree(wait); if (ret == 0) return -1; return 0; } /** * enable_vblank - enable vblank interrupt events * @dev: DRM device * @crtc: which irq to enable * * Enable vblank interrupts for @crtc. If the device doesn't have * a hardware vblank counter, this routine should be a no-op, since * interrupts will have to stay on to keep the count accurate. * * RETURNS * Zero on success, appropriate errno if the given @crtc's vblank * interrupt cannot be enabled. */ int omap_irq_enable_vblank(struct drm_device *dev, int crtc_id) { struct omap_drm_private *priv = dev->dev_private; struct drm_crtc *crtc = priv->crtcs[crtc_id]; unsigned long flags; DBG("dev=%p, crtc=%d", dev, crtc_id); dispc_runtime_get(); spin_lock_irqsave(&list_lock, flags); priv->vblank_mask |= pipe2vbl(crtc); omap_irq_update(dev); spin_unlock_irqrestore(&list_lock, flags); dispc_runtime_put(); return 0; } /** * disable_vblank - disable vblank interrupt events * @dev: DRM device * @crtc: which irq to enable * * Disable vblank interrupts for @crtc. If the device doesn't have * a hardware vblank counter, this routine should be a no-op, since * interrupts will have to stay on to keep the count accurate. */ void omap_irq_disable_vblank(struct drm_device *dev, int crtc_id) { struct omap_drm_private *priv = dev->dev_private; struct drm_crtc *crtc = priv->crtcs[crtc_id]; unsigned long flags; DBG("dev=%p, crtc=%d", dev, crtc_id); dispc_runtime_get(); spin_lock_irqsave(&list_lock, flags); priv->vblank_mask &= ~pipe2vbl(crtc); omap_irq_update(dev); spin_unlock_irqrestore(&list_lock, flags); dispc_runtime_put(); } irqreturn_t omap_irq_handler(DRM_IRQ_ARGS) { struct drm_device *dev = (struct drm_device *) arg; struct omap_drm_private *priv = dev->dev_private; struct omap_drm_irq *handler, *n; unsigned long flags; unsigned int id; u32 irqstatus; irqstatus = dispc_read_irqstatus(); dispc_clear_irqstatus(irqstatus); dispc_read_irqstatus(); /* flush posted write */ VERB("irqs: %08x", irqstatus); for (id = 0; id < priv->num_crtcs; id++) { struct drm_crtc *crtc = priv->crtcs[id]; if (irqstatus & pipe2vbl(crtc)) drm_handle_vblank(dev, id); } spin_lock_irqsave(&list_lock, flags); list_for_each_entry_safe(handler, n, &priv->irq_list, node) { if (handler->irqmask & irqstatus) { spin_unlock_irqrestore(&list_lock, flags); handler->irq(handler, handler->irqmask & irqstatus); spin_lock_irqsave(&list_lock, flags); } } spin_unlock_irqrestore(&list_lock, flags); return IRQ_HANDLED; } void omap_irq_preinstall(struct drm_device *dev) { DBG("dev=%p", dev); dispc_runtime_get(); dispc_clear_irqstatus(0xffffffff); dispc_runtime_put(); } int omap_irq_postinstall(struct drm_device *dev) { struct omap_drm_private *priv = dev->dev_private; struct omap_drm_irq *error_handler = &priv->error_handler; DBG("dev=%p", dev); INIT_LIST_HEAD(&priv->irq_list); error_handler->irq = omap_irq_error_handler; error_handler->irqmask = DISPC_IRQ_OCP_ERR; /* for now ignore DISPC_IRQ_SYNC_LOST_DIGIT.. really I think * we just need to ignore it while enabling tv-out */ error_handler->irqmask &= ~DISPC_IRQ_SYNC_LOST_DIGIT; omap_irq_register(dev, error_handler); return 0; } void omap_irq_uninstall(struct drm_device *dev) { DBG("dev=%p", dev); // TODO prolly need to call drm_irq_uninstall() somewhere too } /* * We need a special version, instead of just using drm_irq_install(), * because we need to register the irq via omapdss. Once omapdss and * omapdrm are merged together we can assign the dispc hwmod data to * ourselves and drop these and just use drm_irq_{install,uninstall}() */ int omap_drm_irq_install(struct drm_device *dev) { int ret; mutex_lock(&dev->struct_mutex); if (dev->irq_enabled) { mutex_unlock(&dev->struct_mutex); return -EBUSY; } dev->irq_enabled = true; mutex_unlock(&dev->struct_mutex); /* Before installing handler */ if (dev->driver->irq_preinstall) dev->driver->irq_preinstall(dev); ret = dispc_request_irq(dev->driver->irq_handler, dev); if (ret < 0) { mutex_lock(&dev->struct_mutex); dev->irq_enabled = false; mutex_unlock(&dev->struct_mutex); return ret; } /* After installing handler */ if (dev->driver->irq_postinstall) ret = dev->driver->irq_postinstall(dev); if (ret < 0) { mutex_lock(&dev->struct_mutex); dev->irq_enabled = false; mutex_unlock(&dev->struct_mutex); dispc_free_irq(dev); } return ret; } int omap_drm_irq_uninstall(struct drm_device *dev) { unsigned long irqflags; bool irq_enabled; int i; mutex_lock(&dev->struct_mutex); irq_enabled = dev->irq_enabled; dev->irq_enabled = false; mutex_unlock(&dev->struct_mutex); /* * Wake up any waiters so they don't hang. */ if (dev->num_crtcs) { spin_lock_irqsave(&dev->vbl_lock, irqflags); for (i = 0; i < dev->num_crtcs; i++) { DRM_WAKEUP(&dev->vblank[i].queue); dev->vblank[i].enabled = false; dev->vblank[i].last = dev->driver->get_vblank_counter(dev, i); } spin_unlock_irqrestore(&dev->vbl_lock, irqflags); } if (!irq_enabled) return -EINVAL; if (dev->driver->irq_uninstall) dev->driver->irq_uninstall(dev); dispc_free_irq(dev); return 0; }