cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/via/via_irq.c

/* 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 <drm/drmP.h>
#include <drm/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 = ARRAY_SIZE(via_pro_group_a_irqs);

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 = ARRAY_SIZE(via_unichrome_irqs);

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); }

Contributors

PersonTokensPropCommitsCommitProp
Dave Airlie47100.00%1100.00%
Total47100.00%1100.00%


u32 via_get_vblank_counter(struct drm_device *dev, unsigned int pipe) { drm_via_private_t *dev_priv = dev->dev_private; if (pipe != 0) return 0; return atomic_read(&dev_priv->vbl_received); }

Contributors

PersonTokensPropCommitsCommitProp
Jesse Barnes3792.50%150.00%
Thierry Reding37.50%150.00%
Total40100.00%2100.00%


irqreturn_t via_driver_irq_handler(int irq, void *arg) { 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_priv->vbl_received); if (!(atomic_read(&dev_priv->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_priv->vbl_received) & 0xFF)) { DRM_DEBUG("US per vblank is: %u\n", dev_priv->usec_per_vblank); } drm_handle_vblank(dev, 0); handled = 1; } for (i = 0; i < dev_priv->num_irqs; ++i) { if (status & cur_irq->pending_mask) { atomic_inc(&cur_irq->irq_received); wake_up(&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++; } /* Acknowledge interrupts */ VIA_WRITE(VIA_REG_INTERRUPT, status); if (handled) return IRQ_HANDLED; else return IRQ_NONE; }

Contributors

PersonTokensPropCommitsCommitProp
Dave Airlie27595.16%342.86%
Daniel Vetter72.42%228.57%
Jesse Barnes62.08%114.29%
Daniel Mack10.35%114.29%
Total289100.00%7100.00%


static __inline__ void viadrv_acknowledge_irqs(drm_via_private_t *dev_priv) { u32 status; if (dev_priv) { /* Acknowledge interrupts */ status = VIA_READ(VIA_REG_INTERRUPT); VIA_WRITE(VIA_REG_INTERRUPT, status | dev_priv->irq_pending_mask); } }

Contributors

PersonTokensPropCommitsCommitProp
Dave Airlie3897.44%150.00%
Daniel Mack12.56%150.00%
Total39100.00%2100.00%


int via_enable_vblank(struct drm_device *dev, unsigned int pipe) { drm_via_private_t *dev_priv = dev->dev_private; u32 status; if (pipe != 0) { DRM_ERROR("%s: bad crtc %u\n", __func__, pipe); return -EINVAL; } status = VIA_READ(VIA_REG_INTERRUPT); VIA_WRITE(VIA_REG_INTERRUPT, status | VIA_IRQ_VBLANK_ENABLE); VIA_WRITE8(0x83d4, 0x11); VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) | 0x30); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jesse Barnes4553.57%233.33%
Dave Airlie3339.29%233.33%
Thierry Reding55.95%116.67%
Simon Farnsworth11.19%116.67%
Total84100.00%6100.00%


void via_disable_vblank(struct drm_device *dev, unsigned int pipe) { drm_via_private_t *dev_priv = dev->dev_private; u32 status; status = VIA_READ(VIA_REG_INTERRUPT); VIA_WRITE(VIA_REG_INTERRUPT, status & ~VIA_IRQ_VBLANK_ENABLE); VIA_WRITE8(0x83d4, 0x11); VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) & ~0x30); if (pipe != 0) DRM_ERROR("%s: bad crtc %u\n", __func__, pipe); }

Contributors

PersonTokensPropCommitsCommitProp
Jesse Barnes4659.74%233.33%
Simon Farnsworth2025.97%116.67%
Dave Airlie67.79%233.33%
Thierry Reding56.49%116.67%
Total77100.00%6100.00%


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 * 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 * HZ, (((cur_irq_sequence = atomic_read(&cur_irq->irq_received)) - *sequence) <= (1 << 23))); } *sequence = cur_irq_sequence; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Dave Airlie24194.51%555.56%
Jayachandran C51.96%111.11%
Márton Németh41.57%111.11%
Eric Anholt31.18%111.11%
Daniel Vetter20.78%111.11%
Total255100.00%9100.00%

/* * 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]; init_waitqueue_head(&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); } }

Contributors

PersonTokensPropCommitsCommitProp
Dave Airlie19882.16%342.86%
Thomas Hellstrom3514.52%114.29%
Jayachandran C62.49%114.29%
Márton Németh10.41%114.29%
Daniel Vetter10.41%114.29%
Total241100.00%7100.00%


int 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("via_driver_irq_postinstall\n"); if (!dev_priv) return -EINVAL; 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); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Dave Airlie7287.80%266.67%
Jesse Barnes1012.20%133.33%
Total82100.00%3100.00%


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)); } }

Contributors

PersonTokensPropCommitsCommitProp
Dave Airlie7998.75%266.67%
Márton Németh11.25%133.33%
Total80100.00%3100.00%


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 (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; }

Contributors

PersonTokensPropCommitsCommitProp
Dave Airlie19586.28%125.00%
Eric Anholt2912.83%250.00%
Márton Németh20.88%125.00%
Total226100.00%4100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Dave Airlie141383.46%733.33%
Jesse Barnes1468.62%29.52%
Thomas Hellstrom352.07%14.76%
Eric Anholt321.89%29.52%
Simon Farnsworth211.24%14.76%
Thierry Reding130.77%14.76%
Jayachandran C110.65%14.76%
Daniel Vetter100.59%314.29%
Márton Németh80.47%14.76%
David Howells20.12%14.76%
Daniel Mack20.12%14.76%
Total1693100.00%21100.00%
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