diff options
Diffstat (limited to 'shared/via_irq.c')
| -rw-r--r-- | shared/via_irq.c | 162 |
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); + } +} + |