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authorMagnus Damm <damm+renesas@opensource.se>2017-10-16 21:29:25 +0900
committerAlex Williamson <alex.williamson@redhat.com>2017-11-06 10:29:39 -0700
commit33f3ac9b511612153bae1d328b0c84c0367cd08d (patch)
treeade58026d7758f2279ced50891ea27ee3bfeff7a /drivers/iommu
parent49c875f030523d676a508e53f7dc3e592e9439d7 (diff)
downloadlinux-33f3ac9b511612153bae1d328b0c84c0367cd08d.tar.bz2
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>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/ipmmu-vmsa.c31
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",