linux/drivers/media/platform/s5p-mfc/s5p_mfc_iommu.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2015 Samsung Electronics Co.Ltd
 * Authors: Marek Szyprowski <m.szyprowski@samsung.com>
 */

#ifndef S5P_MFC_IOMMU_H_
#define S5P_MFC_IOMMU_H_

#if defined(CONFIG_EXYNOS_IOMMU)

#include <linux/iommu.h>

static inline bool exynos_is_iommu_available(struct device *dev)
{
	return dev_iommu_priv_get(dev) != NULL;
}

#else

static inline bool exynos_is_iommu_available(struct device *dev)
{
	return false;
}

#endif

#endif /* S5P_MFC_IOMMU_H_ */
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 2019-05-27 06:55:01 +00:00			`/* SPDX-License-Identifier: GPL-2.0-or-later */`
media: s5p-mfc: add iommu support This patch adds support for IOMMU to s5p-mfc device driver. MFC firmware is limited and it cannot use the default configuration. If IOMMU is available, the patch disables the default DMA address space configuration and creates a new address space of size limited to 256M and base address set to 0x20000000. For now the same address space is shared by both 'left' and 'right' memory channels, because the DMA/IOMMU frameworks do not support configuring them separately. This is not optimal, but besides limiting total address space available has no other drawbacks (MFC firmware supports 256M of address space per each channel). Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com> Tested-by: Javier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> 2016-05-24 13:31:27 +00:00			`/*`
			`* Copyright (C) 2015 Samsung Electronics Co.Ltd`
			`* Authors: Marek Szyprowski <m.szyprowski@samsung.com>`
			`*/`

			`#ifndef S5P_MFC_IOMMU_H_`
			`#define S5P_MFC_IOMMU_H_`

[media] s5p-mfc: Remove special configuration of IOMMU domain The main reason for using special configuration of IOMMU domain was the problem with MFC firmware, which failed to operate properly when placed at 0 DMA address. Instead of adding custom code for configuring each variant of IOMMU domain and architecture specific glue code, simply use what arch code provides and if the DMA base address equals zero, skip first 128 KiB to keep required alignment. This patch also make the driver operational on ARM64 architecture, because it no longer depends on ARM specific DMA-mapping and IOMMU glue code functions. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com> Tested-by: Javier Martinez Canillas <javier@osg.samsung.com> Acked-by: Andrzej Hajda <a.hajda@samsung.com> Tested-by: Smitha T Murthy <smitha.t@samsung.com> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> 2017-02-13 10:47:51 +00:00			`#if defined(CONFIG_EXYNOS_IOMMU)`
media: s5p-mfc: add iommu support This patch adds support for IOMMU to s5p-mfc device driver. MFC firmware is limited and it cannot use the default configuration. If IOMMU is available, the patch disables the default DMA address space configuration and creates a new address space of size limited to 256M and base address set to 0x20000000. For now the same address space is shared by both 'left' and 'right' memory channels, because the DMA/IOMMU frameworks do not support configuring them separately. This is not optimal, but besides limiting total address space available has no other drawbacks (MFC firmware supports 256M of address space per each channel). Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com> Tested-by: Javier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> 2016-05-24 13:31:27 +00:00
iommu/exynos: Use dev_iommu_priv_get/set() Remove the use of dev->archdata.iommu and use the private per-device pointer provided by IOMMU core code instead. Signed-off-by: Joerg Roedel <jroedel@suse.de> Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com> Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> Link: https://lore.kernel.org/r/20200625130836.1916-2-joro@8bytes.org 2020-06-25 13:08:24 +00:00			`#include <linux/iommu.h>`

media: s5p-mfc: add iommu support This patch adds support for IOMMU to s5p-mfc device driver. MFC firmware is limited and it cannot use the default configuration. If IOMMU is available, the patch disables the default DMA address space configuration and creates a new address space of size limited to 256M and base address set to 0x20000000. For now the same address space is shared by both 'left' and 'right' memory channels, because the DMA/IOMMU frameworks do not support configuring them separately. This is not optimal, but besides limiting total address space available has no other drawbacks (MFC firmware supports 256M of address space per each channel). Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com> Tested-by: Javier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> 2016-05-24 13:31:27 +00:00			`static inline bool exynos_is_iommu_available(struct device *dev)`
			`{`
iommu/exynos: Use dev_iommu_priv_get/set() Remove the use of dev->archdata.iommu and use the private per-device pointer provided by IOMMU core code instead. Signed-off-by: Joerg Roedel <jroedel@suse.de> Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com> Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> Link: https://lore.kernel.org/r/20200625130836.1916-2-joro@8bytes.org 2020-06-25 13:08:24 +00:00			`return dev_iommu_priv_get(dev) != NULL;`
media: s5p-mfc: add iommu support This patch adds support for IOMMU to s5p-mfc device driver. MFC firmware is limited and it cannot use the default configuration. If IOMMU is available, the patch disables the default DMA address space configuration and creates a new address space of size limited to 256M and base address set to 0x20000000. For now the same address space is shared by both 'left' and 'right' memory channels, because the DMA/IOMMU frameworks do not support configuring them separately. This is not optimal, but besides limiting total address space available has no other drawbacks (MFC firmware supports 256M of address space per each channel). Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com> Tested-by: Javier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> 2016-05-24 13:31:27 +00:00			`}`

			`#else`

			`static inline bool exynos_is_iommu_available(struct device *dev)`
			`{`
			`return false;`
			`}`

			`#endif`

			`#endif /* S5P_MFC_IOMMU_H_ */`