1 files changed, 322 insertions, 0 deletions

diff --git a/drivers/gpu/drm/omapdrm/omap_irq.c b/drivers/gpu/drm/omapdrm/omap_irq.c
new file mode 100644
index 000000000000..e01303ee00c3
--- /dev/null
+++ b/drivers/gpu/drm/omapdrm/omap_irq.c
@@ -0,0 +1,322 @@
+/*
+ * 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)
+{
+        struct omap_drm_private *priv = dev->dev_private;
+        unsigned long flags;
+
+        DBG("dev=%p, crtc=%d", dev, crtc);
+
+        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)
+{
+        struct omap_drm_private *priv = dev->dev_private;
+        unsigned long flags;
+
+        DBG("dev=%p, crtc=%d", dev, crtc);
+
+        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++)
+                if (irqstatus & pipe2vbl(id))
+                        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 = 1;
+        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 = 0;
+                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 = 0;
+                mutex_unlock(&dev->struct_mutex);
+                dispc_free_irq(dev);
+        }
+
+        return ret;
+}
+
+int omap_drm_irq_uninstall(struct drm_device *dev)
+{
+        unsigned long irqflags;
+        int irq_enabled, i;
+
+        mutex_lock(&dev->struct_mutex);
+        irq_enabled = dev->irq_enabled;
+        dev->irq_enabled = 0;
+        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->vbl_queue[i]);
+                        dev->vblank_enabled[i] = 0;
+                        dev->last_vblank[i] =
+                                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;
+}