diff options
| author | Magnus Damm <damm+renesas@opensource.se> | 2017-10-16 21:29:25 +0900 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2017-11-06 10:29:39 -0700 |
| commit | 33f3ac9b511612153bae1d328b0c84c0367cd08d (patch) | |
| tree | ade58026d7758f2279ced50891ea27ee3bfeff7a | |
| parent | 49c875f030523d676a508e53f7dc3e592e9439d7 (diff) | |
iommu/ipmmu-vmsa: Introduce features, break out alias
Introduce struct ipmmu_features to track various hardware
and software implementation changes inside the driver for
different kinds of IPMMU hardware. Add use_ns_alias_offset
as a first example of a feature to control if the secure
register bank offset should be used or not.
Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
| -rw-r--r-- | drivers/iommu/ipmmu-vmsa.c | 31 |
1 files changed, 24 insertions, 7 deletions
diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c index f6d2e8e650be..5ce7879cb58d 100644 --- a/drivers/iommu/ipmmu-vmsa.c +++ b/drivers/iommu/ipmmu-vmsa.c @@ -19,6 +19,7 @@ #include <linux/iommu.h> #include <linux/module.h> #include <linux/of.h> +#include <linux/of_device.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/sizes.h> @@ -38,11 +39,15 @@ #define IPMMU_CTX_MAX 1 +struct ipmmu_features { + bool use_ns_alias_offset; +}; + struct ipmmu_vmsa_device { struct device *dev; void __iomem *base; struct iommu_device iommu; - + const struct ipmmu_features *features; unsigned int num_utlbs; spinlock_t lock; /* Protects ctx and domains[] */ DECLARE_BITMAP(ctx, IPMMU_CTX_MAX); @@ -817,6 +822,21 @@ static void ipmmu_device_reset(struct ipmmu_vmsa_device *mmu) ipmmu_write(mmu, i * IM_CTX_SIZE + IMCTR, 0); } +static const struct ipmmu_features ipmmu_features_default = { + .use_ns_alias_offset = true, +}; + +static const struct of_device_id ipmmu_of_ids[] = { + { + .compatible = "renesas,ipmmu-vmsa", + .data = &ipmmu_features_default, + }, { + /* Terminator */ + }, +}; + +MODULE_DEVICE_TABLE(of, ipmmu_of_ids); + static int ipmmu_probe(struct platform_device *pdev) { struct ipmmu_vmsa_device *mmu; @@ -834,6 +854,7 @@ static int ipmmu_probe(struct platform_device *pdev) mmu->num_utlbs = 32; spin_lock_init(&mmu->lock); bitmap_zero(mmu->ctx, IPMMU_CTX_MAX); + mmu->features = of_device_get_match_data(&pdev->dev); /* Map I/O memory and request IRQ. */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -853,7 +874,8 @@ static int ipmmu_probe(struct platform_device *pdev) * Offset the registers base unconditionally to point to the non-secure * alias space for now. */ - mmu->base += IM_NS_ALIAS_OFFSET; + if (mmu->features->use_ns_alias_offset) + mmu->base += IM_NS_ALIAS_OFFSET; irq = platform_get_irq(pdev, 0); if (irq < 0) { @@ -907,11 +929,6 @@ static int ipmmu_remove(struct platform_device *pdev) return 0; } -static const struct of_device_id ipmmu_of_ids[] = { - { .compatible = "renesas,ipmmu-vmsa", }, - { } -}; - static struct platform_driver ipmmu_driver = { .driver = { .name = "ipmmu-vmsa", |