diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/Makefile | 1 | ||||
| -rw-r--r-- | drivers/core/device.c | 8 | ||||
| -rw-r--r-- | drivers/iommu/Kconfig | 17 | ||||
| -rw-r--r-- | drivers/iommu/Makefile | 3 | ||||
| -rw-r--r-- | drivers/iommu/iommu-uclass.c | 45 |
6 files changed, 76 insertions, 0 deletions
diff --git a/drivers/Kconfig b/drivers/Kconfig index 417d6f88c29..b26ca8cf70c 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -50,6 +50,8 @@ source "drivers/i2c/Kconfig" source "drivers/input/Kconfig" +source "drivers/iommu/Kconfig" + source "drivers/led/Kconfig" source "drivers/mailbox/Kconfig" diff --git a/drivers/Makefile b/drivers/Makefile index 4cbc40787db..4e7cf284405 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -102,6 +102,7 @@ obj-y += mtd/ obj-y += pwm/ obj-y += reset/ obj-y += input/ +obj-y += iommu/ # SOC specific infrastructure drivers. obj-y += smem/ obj-y += thermal/ diff --git a/drivers/core/device.c b/drivers/core/device.c index d7a778a2413..efd07176e37 100644 --- a/drivers/core/device.c +++ b/drivers/core/device.c @@ -28,6 +28,7 @@ #include <dm/uclass.h> #include <dm/uclass-internal.h> #include <dm/util.h> +#include <iommu.h> #include <linux/err.h> #include <linux/list.h> #include <power-domain.h> @@ -543,6 +544,13 @@ int device_probe(struct udevice *dev) goto fail; } + if (CONFIG_IS_ENABLED(IOMMU) && dev->parent && + (device_get_uclass_id(dev) != UCLASS_IOMMU)) { + ret = dev_iommu_enable(dev); + if (ret) + goto fail; + } + ret = device_get_dma_constraints(dev); if (ret) goto fail; diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig new file mode 100644 index 00000000000..3e35ce8fcc8 --- /dev/null +++ b/drivers/iommu/Kconfig @@ -0,0 +1,17 @@ +# +# IOMMU devices +# + +menu "IOMMU device drivers" + +config IOMMU + bool "Enable Driver Model for IOMMU drivers" + depends on DM + help + Enable driver model for IOMMU devices. An IOMMU maps device + virtiual memory addresses to physical addresses. Devices + that sit behind an IOMMU can typically only access physical + memory if the IOMMU has been programmed to allow access to + that memory. + +endmenu diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile new file mode 100644 index 00000000000..f1ceb101507 --- /dev/null +++ b/drivers/iommu/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0+ + +obj-$(CONFIG_IOMMU) += iommu-uclass.o diff --git a/drivers/iommu/iommu-uclass.c b/drivers/iommu/iommu-uclass.c new file mode 100644 index 00000000000..ed917b3c3e8 --- /dev/null +++ b/drivers/iommu/iommu-uclass.c @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2021 Mark Kettenis <kettenis@openbsd.org> + */ + +#define LOG_CATEGORY UCLASS_IOMMU + +#include <common.h> +#include <dm.h> + +#if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) +int dev_iommu_enable(struct udevice *dev) +{ + struct ofnode_phandle_args args; + struct udevice *dev_iommu; + int i, count, ret = 0; + + count = dev_count_phandle_with_args(dev, "iommus", + "#iommu-cells", 0); + for (i = 0; i < count; i++) { + ret = dev_read_phandle_with_args(dev, "iommus", + "#iommu-cells", 0, i, &args); + if (ret) { + debug("%s: dev_read_phandle_with_args failed: %d\n", + __func__, ret); + return ret; + } + + ret = uclass_get_device_by_ofnode(UCLASS_IOMMU, args.node, + &dev_iommu); + if (ret) { + debug("%s: uclass_get_device_by_ofnode failed: %d\n", + __func__, ret); + return ret; + } + } + + return 0; +} +#endif + +UCLASS_DRIVER(iommu) = { + .id = UCLASS_IOMMU, + .name = "iommu", +}; |