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authorThomas Hellstrom <unichrome@shipmail.org>2004-03-23 21:08:48 +0000
committerThomas Hellstrom <unichrome@shipmail.org>2004-03-23 21:08:48 +0000
commit6cd8831f7accbcc3efb019d7d288c5b6cc28a230 (patch)
tree86d5e42b3924d82d444058f0a8fde934adf30753 /shared/via_irq.c
parent681da75af9837fd433d4773c86df52de1c8dba60 (diff)
Merged via-1-2-0
Diffstat (limited to 'shared/via_irq.c')
-rw-r--r--shared/via_irq.c162
1 files changed, 162 insertions, 0 deletions
diff --git a/shared/via_irq.c b/shared/via_irq.c
new file mode 100644
index 00000000..835b41cd
--- /dev/null
+++ b/shared/via_irq.c
@@ -0,0 +1,162 @@
+/* via_irq.c
+ *
+ * Copyright 2004 BEAM Ltd.
+ * Copyright 2002 Tungsten Graphics, Inc.
+ * 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>
+ *
+ *
+ * This code provides standard DRM access to the Via CLE266's Vertical blank
+ * interrupt.
+ */
+
+#include "via.h"
+#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_VBI_ENABLE (1 << 19)
+#define VIA_IRQ_VBI_PENDING (1 << 3)
+
+irqreturn_t DRM(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;
+
+ status = VIA_READ(VIA_REG_INTERRUPT);
+ DRM_DEBUG("viadrv_irq_handler Status: %x\n",status);
+ if(status & VIA_IRQ_VBI_PENDING){
+ atomic_inc(&dev->vbl_received);
+ DRM_WAKEUP(&dev->vbl_queue);
+ DRM(vbl_send_signals)(dev);
+ handled = 1;
+ }
+
+ /* Acknowlege interrupts ?? */
+ VIA_WRITE(VIA_REG_INTERRUPT, status);
+ return IRQ_RETVAL(handled);
+}
+
+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 | VIA_IRQ_VBI_PENDING);
+ }
+}
+
+int DRM(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;
+}
+
+/*
+ * drm_dma.h hooks
+ */
+void DRM(driver_irq_preinstall)(drm_device_t* dev){
+ drm_via_private_t* dev_priv = (drm_via_private_t *)dev->dev_private;
+ u32 status;
+
+ DRM_DEBUG("driver_irq_preinstall: dev_priv: %p\n", dev_priv);
+ if(dev_priv){
+ DRM_DEBUG("mmio: %p\n", dev_priv->mmio);
+ status = VIA_READ(VIA_REG_INTERRUPT);
+ DRM_DEBUG("intreg: %x\n", status & VIA_IRQ_VBI_ENABLE);
+
+ // Clear VSync interrupt regs
+ VIA_WRITE(VIA_REG_INTERRUPT, status & ~VIA_IRQ_VBI_ENABLE);
+
+ /* Clear bits if they're already high */
+ viadrv_acknowledge_irqs(dev_priv);
+ }
+}
+
+void DRM(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
+ | VIA_IRQ_VBI_ENABLE);
+ /* Some magic, oh for some data sheets ! */
+
+ VIA_WRITE8(0x83d4, 0x11);
+ VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) | 0x30);
+
+ }
+}
+
+void DRM(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_VBI_ENABLE);
+ }
+}
+