diff options
Diffstat (limited to 'drivers/gpu/drm/via/via_irq.c')
| -rw-r--r-- | drivers/gpu/drm/via/via_irq.c | 377 |
1 files changed, 377 insertions, 0 deletions
diff --git a/drivers/gpu/drm/via/via_irq.c b/drivers/gpu/drm/via/via_irq.c new file mode 100644 index 00000000000..c6bb978a110 --- /dev/null +++ b/drivers/gpu/drm/via/via_irq.c @@ -0,0 +1,377 @@ +/* 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) +#define VIA_IRQ_DMA0_DD_ENABLE (1 << 20) +#define VIA_IRQ_DMA0_TD_ENABLE (1 << 21) +#define VIA_IRQ_DMA1_DD_ENABLE (1 << 22) +#define VIA_IRQ_DMA1_TD_ENABLE (1 << 23) +#define VIA_IRQ_DMA0_DD_PENDING (1 << 4) +#define VIA_IRQ_DMA0_TD_PENDING (1 << 5) +#define VIA_IRQ_DMA1_DD_PENDING (1 << 6) +#define VIA_IRQ_DMA1_TD_PENDING (1 << 7) + + +/* + * 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}, + {VIA_IRQ_DMA0_TD_ENABLE, VIA_IRQ_DMA0_TD_PENDING, VIA_PCI_DMA_CSR0, + VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008}, + {VIA_IRQ_DMA1_TD_ENABLE, VIA_IRQ_DMA1_TD_PENDING, VIA_PCI_DMA_CSR1, + VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008}, +}; +static int via_num_pro_group_a = + sizeof(via_pro_group_a_irqs) / sizeof(maskarray_t); +static int via_irqmap_pro_group_a[] = {0, 1, -1, 2, -1, 3}; + +static maskarray_t via_unichrome_irqs[] = { + {VIA_IRQ_DMA0_TD_ENABLE, VIA_IRQ_DMA0_TD_PENDING, VIA_PCI_DMA_CSR0, + VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008}, + {VIA_IRQ_DMA1_TD_ENABLE, VIA_IRQ_DMA1_TD_PENDING, VIA_PCI_DMA_CSR1, + VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008} +}; +static int via_num_unichrome = sizeof(via_unichrome_irqs) / sizeof(maskarray_t); +static int via_irqmap_unichrome[] = {-1, -1, -1, 0, -1, 1}; + +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) +{ + struct drm_device *dev = (struct drm_device *) 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; + if (dev_priv->irq_map[drm_via_irq_dma0_td] == i) { + via_dmablit_handler(dev, 0, 1); + } else if (dev_priv->irq_map[drm_via_irq_dma1_td] == i) { + via_dmablit_handler(dev, 1, 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(struct drm_device * 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("\n"); + if (!dev_priv) { + DRM_ERROR("called with no initialization\n"); + 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(struct drm_device * 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; + int ret = 0; + maskarray_t *masks; + int real_irq; + + DRM_DEBUG("\n"); + + if (!dev_priv) { + DRM_ERROR("called with no initialization\n"); + return -EINVAL; + } + + if (irq >= drm_via_irq_num) { + DRM_ERROR("Trying to wait on unknown irq %d\n", irq); + return -EINVAL; + } + + real_irq = dev_priv->irq_map[irq]; + + if (real_irq < 0) { + DRM_ERROR("Video IRQ %d not available on this hardware.\n", + irq); + return -EINVAL; + } + + masks = dev_priv->irq_masks; + cur_irq = dev_priv->via_irqs + real_irq; + + if (masks[real_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(struct drm_device * dev) +{ + drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private; + u32 status; + drm_via_irq_t *cur_irq; + int i; + + DRM_DEBUG("dev_priv: %p\n", dev_priv); + if (dev_priv) { + cur_irq = dev_priv->via_irqs; + + dev_priv->irq_enable_mask = VIA_IRQ_VBLANK_ENABLE; + dev_priv->irq_pending_mask = VIA_IRQ_VBLANK_PENDING; + + if (dev_priv->chipset == VIA_PRO_GROUP_A || + dev_priv->chipset == VIA_DX9_0) { + dev_priv->irq_masks = via_pro_group_a_irqs; + dev_priv->num_irqs = via_num_pro_group_a; + dev_priv->irq_map = via_irqmap_pro_group_a; + } else { + dev_priv->irq_masks = via_unichrome_irqs; + dev_priv->num_irqs = via_num_unichrome; + dev_priv->irq_map = via_irqmap_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(struct drm_device * dev) +{ + drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private; + u32 status; + + DRM_DEBUG("\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(struct drm_device * dev) +{ + drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private; + u32 status; + + DRM_DEBUG("\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(struct drm_device *dev, void *data, struct drm_file *file_priv) +{ + drm_via_irqwait_t *irqwait = data; + 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 -EINVAL; + + if (irqwait->request.irq >= dev_priv->num_irqs) { + DRM_ERROR("Trying to wait on unknown irq %d\n", + irqwait->request.irq); + return -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 -EINVAL; + } + + if (irqwait->request.type & VIA_IRQ_SIGNAL) { + DRM_ERROR("Signals on Via IRQs not implemented yet.\n"); + return -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; + + return ret; +} |