@@ -15,7 +15,7 @@ if IOMMU_SUPPORT
config OF_IOMMU
def_bool y
- depends on OF
+ depends on OF && IOMMU_API
config FSL_PAMU
bool "Freescale IOMMU support"
@@ -18,6 +18,7 @@
*/
#include <linux/export.h>
+#include <linux/iommu.h>
#include <linux/limits.h>
#include <linux/of.h>
#include <linux/of_iommu.h>
@@ -93,6 +94,38 @@ int of_get_dma_window(struct device_node *dn, const char *prefix, int index,
}
EXPORT_SYMBOL_GPL(of_get_dma_window);
+struct iommu_ops *of_iommu_configure(struct device *dev)
+{
+ struct of_phandle_args iommu_spec;
+ struct device_node *np;
+ struct iommu_ops *ops = NULL;
+ int idx = 0;
+
+ /*
+ * We don't currently walk up the tree looking for a parent IOMMU.
+ * See the `Notes:' section of
+ * Documentation/devicetree/bindings/iommu/iommu.txt
+ */
+ while (!of_parse_phandle_with_args(dev->of_node, "iommus",
+ "#iommu-cells", idx,
+ &iommu_spec)) {
+ np = iommu_spec.np;
+ ops = of_iommu_get_ops(np);
+
+ if (!ops || !ops->of_xlate || ops->of_xlate(dev, &iommu_spec))
+ goto err_put_node;
+
+ of_node_put(np);
+ idx++;
+ }
+
+ return ops;
+
+err_put_node:
+ of_node_put(np);
+ return NULL;
+}
+
void __init of_iommu_init(void)
{
struct device_node *np;
@@ -1,6 +1,7 @@
#ifndef __OF_IOMMU_H
#define __OF_IOMMU_H
+#include <linux/device.h>
#include <linux/iommu.h>
#include <linux/of.h>
@@ -11,6 +12,7 @@ extern int of_get_dma_window(struct device_node *dn, const char *prefix,
size_t *size);
extern void of_iommu_init(void);
+extern struct iommu_ops *of_iommu_configure(struct device *dev);
#else
@@ -22,6 +24,10 @@ static inline int of_get_dma_window(struct device_node *dn, const char *prefix,
}
static inline void of_iommu_init(void) { }
+static inline struct iommu_ops *of_iommu_configure(struct device *dev)
+{
+ return NULL;
+}
#endif /* CONFIG_OF_IOMMU */
The generic IOMMU device-tree bindings can be used to add arbitrary OF masters to an IOMMU with a compliant binding. This patch introduces of_iommu_configure, which does exactly that. Signed-off-by: Will Deacon <will.deacon@arm.com> --- drivers/iommu/Kconfig | 2 +- drivers/iommu/of_iommu.c | 33 +++++++++++++++++++++++++++++++++ include/linux/of_iommu.h | 6 ++++++ 3 files changed, 40 insertions(+), 1 deletion(-)