1 files changed, 339 insertions, 0 deletions

diff --git a/drivers/char/drm/via_irq.c b/drivers/char/drm/via_irq.c
new file mode 100644
index 000000000000..e8027f3a93b0
--- /dev/null
+++ b/drivers/char/drm/via_irq.c
@@ -0,0 +1,339 @@
+/* via_irq.c
+ *
+ * Copyright 2004 BEAM Ltd.
+ * Copyright 2002 Tungsten Graphics, Inc.
+ * Copyright 2005 Thomas Hellstrom.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BEAM LTD, TUNGSTEN GRAPHICS  AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Terry Barnaby <terry1@beam.ltd.uk>
+ *    Keith Whitwell <keith@tungstengraphics.com>
+ *    Thomas Hellstrom <unichrome@shipmail.org>
+ *
+ * This code provides standard DRM access to the Via Unichrome / Pro Vertical blank
+ * interrupt, as well as an infrastructure to handle other interrupts of the chip.
+ * The refresh rate is also calculated for video playback sync purposes.
+ */
+
+#include "drmP.h"
+#include "drm.h"
+#include "via_drm.h"
+#include "via_drv.h"
+
+#define VIA_REG_INTERRUPT       0x200
+
+/* VIA_REG_INTERRUPT */
+#define VIA_IRQ_GLOBAL          (1 << 31)
+#define VIA_IRQ_VBLANK_ENABLE   (1 << 19)
+#define VIA_IRQ_VBLANK_PENDING  (1 << 3)
+#define VIA_IRQ_HQV0_ENABLE     (1 << 11)
+#define VIA_IRQ_HQV1_ENABLE     (1 << 25)
+#define VIA_IRQ_HQV0_PENDING    (1 << 9)
+#define VIA_IRQ_HQV1_PENDING    (1 << 10)
+
+/*
+ * Device-specific IRQs go here. This type might need to be extended with
+ * the register if there are multiple IRQ control registers.
+ * Currently we activate the HQV interrupts of  Unichrome Pro group A. 
+ */
+
+static maskarray_t via_pro_group_a_irqs[] = {
+        {VIA_IRQ_HQV0_ENABLE, VIA_IRQ_HQV0_PENDING, 0x000003D0, 0x00008010, 0x00000000 },
+        {VIA_IRQ_HQV1_ENABLE, VIA_IRQ_HQV1_PENDING, 0x000013D0, 0x00008010, 0x00000000 }};
+static int via_num_pro_group_a = sizeof(via_pro_group_a_irqs)/sizeof(maskarray_t);
+
+static maskarray_t via_unichrome_irqs[] = {};
+static int via_num_unichrome = sizeof(via_unichrome_irqs)/sizeof(maskarray_t);
+
+
+static unsigned time_diff(struct timeval *now,struct timeval *then) 
+{
+    return (now->tv_usec >= then->tv_usec) ?
+        now->tv_usec - then->tv_usec :
+        1000000 - (then->tv_usec - now->tv_usec);
+}
+
+irqreturn_t via_driver_irq_handler(DRM_IRQ_ARGS)
+{
+        drm_device_t *dev = (drm_device_t *) arg;
+        drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
+        u32 status;
+        int handled = 0;
+        struct timeval cur_vblank;
+        drm_via_irq_t *cur_irq = dev_priv->via_irqs;
+        int i;
+
+        status = VIA_READ(VIA_REG_INTERRUPT);
+        if (status & VIA_IRQ_VBLANK_PENDING) {
+                atomic_inc(&dev->vbl_received);
+                if (!(atomic_read(&dev->vbl_received) & 0x0F)) {
+                        do_gettimeofday(&cur_vblank);
+                        if (dev_priv->last_vblank_valid) {
+                                dev_priv->usec_per_vblank = 
+                                        time_diff( &cur_vblank,&dev_priv->last_vblank) >> 4;
+                        }
+                        dev_priv->last_vblank = cur_vblank;
+                        dev_priv->last_vblank_valid = 1;
+                }
+                if (!(atomic_read(&dev->vbl_received) & 0xFF)) {
+                        DRM_DEBUG("US per vblank is: %u\n",
+                                dev_priv->usec_per_vblank);
+                }
+                DRM_WAKEUP(&dev->vbl_queue);
+                drm_vbl_send_signals(dev);
+                handled = 1;
+        }
+        
+
+        for (i=0; i<dev_priv->num_irqs; ++i) {
+                if (status & cur_irq->pending_mask) {
+                        atomic_inc( &cur_irq->irq_received );
+                        DRM_WAKEUP( &cur_irq->irq_queue );
+                        handled = 1;
+                }
+                cur_irq++;
+        }
+        
+        /* Acknowlege interrupts */
+        VIA_WRITE(VIA_REG_INTERRUPT, status);
+
+
+        if (handled)
+                return IRQ_HANDLED;
+        else
+                return IRQ_NONE;
+}
+
+static __inline__ void viadrv_acknowledge_irqs(drm_via_private_t * dev_priv)
+{
+        u32 status;
+
+        if (dev_priv) {
+                /* Acknowlege interrupts */
+                status = VIA_READ(VIA_REG_INTERRUPT);
+                VIA_WRITE(VIA_REG_INTERRUPT, status | 
+                          dev_priv->irq_pending_mask);
+        }
+}
+
+int via_driver_vblank_wait(drm_device_t * dev, unsigned int *sequence)
+{
+        drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
+        unsigned int cur_vblank;
+        int ret = 0;
+
+        DRM_DEBUG("viadrv_vblank_wait\n");
+        if (!dev_priv) {
+                DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
+                return -EINVAL;
+        }
+
+        viadrv_acknowledge_irqs(dev_priv);
+
+        /* Assume that the user has missed the current sequence number
+         * by about a day rather than she wants to wait for years
+         * using vertical blanks...
+         */
+
+        DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
+                    (((cur_vblank = atomic_read(&dev->vbl_received)) -
+                      *sequence) <= (1 << 23)));
+        
+        *sequence = cur_vblank;
+        return ret;
+}
+
+static int 
+via_driver_irq_wait(drm_device_t * dev, unsigned int irq, int force_sequence,
+                    unsigned int *sequence)
+{
+        drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
+        unsigned int cur_irq_sequence;
+        drm_via_irq_t *cur_irq = dev_priv->via_irqs;
+        int ret = 0;
+        maskarray_t *masks = dev_priv->irq_masks;
+
+        DRM_DEBUG("%s\n", __FUNCTION__);
+
+        if (!dev_priv) {
+                DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
+                return DRM_ERR(EINVAL);
+        }
+
+        if (irq >= dev_priv->num_irqs ) {
+                DRM_ERROR("%s Trying to wait on unknown irq %d\n", __FUNCTION__, irq);
+                return DRM_ERR(EINVAL);
+        }
+                
+        cur_irq += irq;
+
+        if (masks[irq][2] && !force_sequence) {
+                DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * DRM_HZ,
+                            ((VIA_READ(masks[irq][2]) & masks[irq][3]) == masks[irq][4]));
+                cur_irq_sequence = atomic_read(&cur_irq->irq_received);
+        } else {
+                DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * DRM_HZ,
+                            (((cur_irq_sequence = atomic_read(&cur_irq->irq_received)) -
+                              *sequence) <= (1 << 23)));                
+        }
+        *sequence = cur_irq_sequence;
+        return ret;
+}
+
+
+/*
+ * drm_dma.h hooks
+ */
+
+void via_driver_irq_preinstall(drm_device_t * dev)
+{
+        drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
+        u32 status;
+        drm_via_irq_t *cur_irq = dev_priv->via_irqs;
+        int i;
+
+        DRM_DEBUG("driver_irq_preinstall: dev_priv: %p\n", dev_priv);
+        if (dev_priv) {
+
+                dev_priv->irq_enable_mask = VIA_IRQ_VBLANK_ENABLE;
+                dev_priv->irq_pending_mask = VIA_IRQ_VBLANK_PENDING;
+
+                dev_priv->irq_masks = (dev_priv->pro_group_a) ?
+                        via_pro_group_a_irqs : via_unichrome_irqs;
+                dev_priv->num_irqs = (dev_priv->pro_group_a) ?
+                        via_num_pro_group_a : via_num_unichrome;
+                
+                for(i=0; i < dev_priv->num_irqs; ++i) {
+                        atomic_set(&cur_irq->irq_received, 0);
+                        cur_irq->enable_mask = dev_priv->irq_masks[i][0]; 
+                        cur_irq->pending_mask = dev_priv->irq_masks[i][1];
+                        DRM_INIT_WAITQUEUE( &cur_irq->irq_queue );
+                        dev_priv->irq_enable_mask |= cur_irq->enable_mask;
+                        dev_priv->irq_pending_mask |= cur_irq->pending_mask;
+                        cur_irq++;
+                        
+                        DRM_DEBUG("Initializing IRQ %d\n", i);
+                }
+                        
+                dev_priv->last_vblank_valid = 0;
+
+                // Clear VSync interrupt regs
+                status = VIA_READ(VIA_REG_INTERRUPT);
+                VIA_WRITE(VIA_REG_INTERRUPT, status & 
+                          ~(dev_priv->irq_enable_mask));
+                
+                /* Clear bits if they're already high */
+                viadrv_acknowledge_irqs(dev_priv);
+        }
+}
+
+void via_driver_irq_postinstall(drm_device_t * dev)
+{
+        drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
+        u32 status;
+
+        DRM_DEBUG("via_driver_irq_postinstall\n");
+        if (dev_priv) {
+                status = VIA_READ(VIA_REG_INTERRUPT);
+                VIA_WRITE(VIA_REG_INTERRUPT, status | VIA_IRQ_GLOBAL
+                          | dev_priv->irq_enable_mask);
+
+                /* Some magic, oh for some data sheets ! */
+
+                VIA_WRITE8(0x83d4, 0x11);
+                VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) | 0x30);
+                
+        }
+}
+
+void via_driver_irq_uninstall(drm_device_t * dev)
+{
+        drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
+        u32 status;
+
+        DRM_DEBUG("driver_irq_uninstall)\n");
+        if (dev_priv) {
+
+                /* Some more magic, oh for some data sheets ! */
+
+                VIA_WRITE8(0x83d4, 0x11);
+                VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) & ~0x30);
+
+                status = VIA_READ(VIA_REG_INTERRUPT);
+                VIA_WRITE(VIA_REG_INTERRUPT, status & 
+                          ~(VIA_IRQ_VBLANK_ENABLE | dev_priv->irq_enable_mask));
+        }
+}
+
+int via_wait_irq(DRM_IOCTL_ARGS)
+{
+        drm_file_t *priv = filp->private_data;
+        drm_device_t *dev = priv->head->dev;
+        drm_via_irqwait_t __user *argp = (void __user *)data;
+        drm_via_irqwait_t irqwait;
+        struct timeval now;
+        int ret = 0;
+        drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
+        drm_via_irq_t *cur_irq = dev_priv->via_irqs;
+        int force_sequence;
+
+        if (!dev->irq)
+                return DRM_ERR(EINVAL);
+
+        DRM_COPY_FROM_USER_IOCTL(irqwait, argp, sizeof(irqwait));
+        if (irqwait.request.irq >= dev_priv->num_irqs) {
+                DRM_ERROR("%s Trying to wait on unknown irq %d\n", __FUNCTION__, 
+                          irqwait.request.irq);
+                return DRM_ERR(EINVAL);
+        }
+
+        cur_irq += irqwait.request.irq;
+
+        switch (irqwait.request.type & ~VIA_IRQ_FLAGS_MASK) {
+        case VIA_IRQ_RELATIVE:
+                irqwait.request.sequence += atomic_read(&cur_irq->irq_received);
+                irqwait.request.type &= ~_DRM_VBLANK_RELATIVE;
+        case VIA_IRQ_ABSOLUTE:
+                break;
+        default:
+                return DRM_ERR(EINVAL);
+        }
+
+        if (irqwait.request.type & VIA_IRQ_SIGNAL) {
+                DRM_ERROR("%s Signals on Via IRQs not implemented yet.\n", 
+                          __FUNCTION__);
+                return DRM_ERR(EINVAL);
+        }
+
+        force_sequence = (irqwait.request.type & VIA_IRQ_FORCE_SEQUENCE);
+
+        ret = via_driver_irq_wait(dev, irqwait.request.irq, force_sequence,
+                                  &irqwait.request.sequence);
+        do_gettimeofday(&now);
+        irqwait.reply.tval_sec = now.tv_sec;
+        irqwait.reply.tval_usec = now.tv_usec;
+
+        DRM_COPY_TO_USER_IOCTL(argp, irqwait, sizeof(irqwait));
+
+        return ret;
+}