From: Magnus Damm <damm+renesas@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
---
Changes since V4:
- None
Changes since V3:
- Use of_device_get_match_data(), thanks Robin!
Changes since V2:
- None
Changes since V1:
- Moved patch to front of the series
drivers/iommu/ipmmu-vmsa.c | 31 ++++++++++++++++++++++++-------
1 file changed, 24 insertions(+), 7 deletions(-)
--- 0001/drivers/iommu/ipmmu-vmsa.c
+++ work/drivers/iommu/ipmmu-vmsa.c 2017-10-12 15:16:43.510607110 +0900
@@ -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>
@@ -33,11 +34,15 @@
#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);
@@ -910,6 +915,21 @@ static void ipmmu_device_reset(struct ip
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;
@@ -927,6 +947,7 @@ static int ipmmu_probe(struct platform_d
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);
@@ -946,7 +967,8 @@ static int ipmmu_probe(struct platform_d
* 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) {
@@ -1002,11 +1024,6 @@ static int ipmmu_remove(struct platform_
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",
