diff options
author | Mark Kettenis <kettenis@openbsd.org> | 2021-10-23 17:58:01 +0300 |
---|---|---|
committer | Tom Rini <trini@konsulko.com> | 2021-10-31 15:46:44 +0300 |
commit | 40dbf03d7d2dd2b5516f797069e3ea830db6fecc (patch) | |
tree | 130f479f79def7c72f81cf6ffd834a0c9c2bf82e /drivers | |
parent | d73db3042734f8077a5866d9d60d2eeda685b2ec (diff) | |
download | u-boot-40dbf03d7d2dd2b5516f797069e3ea830db6fecc.tar.xz |
iommu: Add IOMMU uclass
This uclass is intended to manage IOMMUs on systems where the
IOMMUs are not in bypass mode by default. In that case U-Boot
cannot ignore the IOMMUs if it wants to use devices that need
to do DMA and sit behind such an IOMMU.
This initial IOMMU uclass implementation does not implement and
device ops and is intended for IOMMUs that have a bypass mode
that does not require address translation. Support for IOMMUs
that do require address translation is planned and device ops
will be defined when support for such IOMMUs will be added.
Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
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 417d6f88c2..b26ca8cf70 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 4cbc40787d..4e7cf28440 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 d7a778a241..efd07176e3 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 0000000000..3e35ce8fcc --- /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 0000000000..f1ceb10150 --- /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 0000000000..ed917b3c3e --- /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", +}; |