[deliverable/linux.git] / drivers / gpu / drm / exynos / exynos_drm_iommu.c

/* exynos_drm_iommu.c
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 * Author: Inki Dae <inki.dae@samsung.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <drm/drmP.h>
#include <drm/exynos_drm.h>

#include <linux/dma-mapping.h>
#include <linux/iommu.h>

#include "exynos_drm_drv.h"
#include "exynos_drm_iommu.h"

static inline int configure_dma_max_seg_size(struct device *dev)
{
	if (!dev->dma_parms)
		dev->dma_parms = kzalloc(sizeof(*dev->dma_parms), GFP_KERNEL);
	if (!dev->dma_parms)
		return -ENOMEM;

	dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
	return 0;
}

static inline void clear_dma_max_seg_size(struct device *dev)
{
	kfree(dev->dma_parms);
	dev->dma_parms = NULL;
}

/*
 * drm_create_iommu_mapping - create a mapping structure
 *
 * @drm_dev: DRM device
 */
int drm_create_iommu_mapping(struct drm_device *drm_dev)
{
	struct exynos_drm_private *priv = drm_dev->dev_private;

	return __exynos_iommu_create_mapping(priv, EXYNOS_DEV_ADDR_START,
					     EXYNOS_DEV_ADDR_SIZE);
}

/*
 * drm_release_iommu_mapping - release iommu mapping structure
 *
 * @drm_dev: DRM device
 */
void drm_release_iommu_mapping(struct drm_device *drm_dev)
{
	struct exynos_drm_private *priv = drm_dev->dev_private;

	__exynos_iommu_release_mapping(priv);
}

/*
 * drm_iommu_attach_device- attach device to iommu mapping
 *
 * @drm_dev: DRM device
 * @subdrv_dev: device to be attach
 *
 * This function should be called by sub drivers to attach it to iommu
 * mapping.
 */
int drm_iommu_attach_device(struct drm_device *drm_dev,
				struct device *subdrv_dev)
{
	struct exynos_drm_private *priv = drm_dev->dev_private;
	int ret;

	if (get_dma_ops(priv->dma_dev) != get_dma_ops(subdrv_dev)) {
		DRM_ERROR("Device %s lacks support for IOMMU\n",
			  dev_name(subdrv_dev));
		return -EINVAL;
	}

	ret = configure_dma_max_seg_size(subdrv_dev);
	if (ret)
		return ret;

	ret = __exynos_iommu_attach(priv, subdrv_dev);
	if (ret)
		clear_dma_max_seg_size(subdrv_dev);

	return 0;
}

/*
 * drm_iommu_detach_device -detach device address space mapping from device
 *
 * @drm_dev: DRM device
 * @subdrv_dev: device to be detached
 *
 * This function should be called by sub drivers to detach it from iommu
 * mapping
 */
void drm_iommu_detach_device(struct drm_device *drm_dev,
				struct device *subdrv_dev)
{
	struct exynos_drm_private *priv = drm_dev->dev_private;

	__exynos_iommu_detach(priv, subdrv_dev);
	clear_dma_max_seg_size(subdrv_dev);
}
Commit	Line	Data
0519f9a1 ID	1	/* exynos_drm_iommu.c
	2	*
	3	* Copyright (c) 2012 Samsung Electronics Co., Ltd.
	4	* Author: Inki Dae <inki.dae@samsung.com>
	5	*
d81aecb5 ID	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the
	8	* Free Software Foundation; either version 2 of the License, or (at your
	9	* option) any later version.
0519f9a1 ID	10	*/
0519f9a1 ID	11
4e6319cd	12	#include <drm/drmP.h>
0519f9a1 ID	13	#include <drm/exynos_drm.h>
	14
	15	#include <linux/dma-mapping.h>
	16	#include <linux/iommu.h>
0519f9a1 ID	17
	18	#include "exynos_drm_drv.h"
	19	#include "exynos_drm_iommu.h"
	20
f7c72773 MS	21	static inline int configure_dma_max_seg_size(struct device *dev)
	22	{
	23	if (!dev->dma_parms)
	24	dev->dma_parms = kzalloc(sizeof(*dev->dma_parms), GFP_KERNEL);
	25	if (!dev->dma_parms)
	26	return -ENOMEM;
	27
	28	dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
	29	return 0;
	30	}
	31
	32	static inline void clear_dma_max_seg_size(struct device *dev)
	33	{
	34	kfree(dev->dma_parms);
	35	dev->dma_parms = NULL;
	36	}
	37
0519f9a1 ID	38	/*
	39	* drm_create_iommu_mapping - create a mapping structure
	40	*
	41	* @drm_dev: DRM device
	42	*/
	43	int drm_create_iommu_mapping(struct drm_device *drm_dev)
	44	{
0519f9a1	45	struct exynos_drm_private *priv = drm_dev->dev_private;
0519f9a1	46
17879a41 MS	47	return __exynos_iommu_create_mapping(priv, EXYNOS_DEV_ADDR_START,
17879a41 MS	48	EXYNOS_DEV_ADDR_SIZE);
0519f9a1 ID	49	}
	50
	51	/*
	52	* drm_release_iommu_mapping - release iommu mapping structure
	53	*
	54	* @drm_dev: DRM device
0519f9a1 ID	55	*/
	56	void drm_release_iommu_mapping(struct drm_device *drm_dev)
	57	{
f43c3596	58	struct exynos_drm_private *priv = drm_dev->dev_private;
0519f9a1	59
17879a41	60	__exynos_iommu_release_mapping(priv);
0519f9a1 ID	61	}
	62
	63	/*
	64	* drm_iommu_attach_device- attach device to iommu mapping
	65	*
	66	* @drm_dev: DRM device
	67	* @subdrv_dev: device to be attach
	68	*
	69	* This function should be called by sub drivers to attach it to iommu
	70	* mapping.
	71	*/
	72	int drm_iommu_attach_device(struct drm_device *drm_dev,
	73	struct device *subdrv_dev)
	74	{
f43c3596	75	struct exynos_drm_private *priv = drm_dev->dev_private;
0519f9a1 ID	76	int ret;
0519f9a1 ID	77
c04d9eb7 MS	78	if (get_dma_ops(priv->dma_dev) != get_dma_ops(subdrv_dev)) {
	79	DRM_ERROR("Device %s lacks support for IOMMU\n",
	80	dev_name(subdrv_dev));
	81	return -EINVAL;
	82	}
4db7fcdf	83
f7c72773 MS	84	ret = configure_dma_max_seg_size(subdrv_dev);
	85	if (ret)
	86	return ret;
0519f9a1	87
17879a41 MS	88	ret = __exynos_iommu_attach(priv, subdrv_dev);
17879a41 MS	89	if (ret)
f7c72773	90	clear_dma_max_seg_size(subdrv_dev);
0519f9a1	91
0519f9a1 ID	92	return 0;
	93	}
	94
	95	/*
	96	* drm_iommu_detach_device -detach device address space mapping from device
	97	*
	98	* @drm_dev: DRM device
	99	* @subdrv_dev: device to be detached
	100	*
	101	* This function should be called by sub drivers to detach it from iommu
	102	* mapping
	103	*/
	104	void drm_iommu_detach_device(struct drm_device *drm_dev,
	105	struct device *subdrv_dev)
	106	{
f43c3596	107	struct exynos_drm_private *priv = drm_dev->dev_private;
0519f9a1	108
17879a41	109	__exynos_iommu_detach(priv, subdrv_dev);
f7c72773	110	clear_dma_max_seg_size(subdrv_dev);
0519f9a1	111	}