Introduce handling of driver options. Options are set based on DT
information when probing an SMMU device. The first option introduced
is "arm,smmu-isolate-devices". (It will be used in the bus notifier
block.)
Cc: Andreas Herrmann <herrmann.der.u...@googlemail.com>
Signed-off-by: Andreas Herrmann <andreas.herrm...@calxeda.com>
---
drivers/iommu/arm-smmu.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index e46a887..0b97d03 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -47,6 +47,9 @@
#include <asm/pgalloc.h>
+/* Driver options */
+#define ARM_SMMU_OPT_ISOLATE_DEVICES (1 << 0)
+
/* Maximum number of stream IDs assigned to a single device */
#define MAX_MASTER_STREAMIDS 8
@@ -348,6 +351,7 @@ struct arm_smmu_device {
#define ARM_SMMU_FEAT_TRANS_S2 (1 << 3)
#define ARM_SMMU_FEAT_TRANS_NESTED (1 << 4)
u32 features;
+ u32 options;
int version;
u32 num_context_banks;
@@ -398,6 +402,29 @@ struct arm_smmu_domain {
static DEFINE_SPINLOCK(arm_smmu_devices_lock);
static LIST_HEAD(arm_smmu_devices);
+struct arm_smmu_option_prop {
+ u32 opt;
+ const char *prop;
+};
+
+static struct arm_smmu_option_prop arm_smmu_options [] = {
+ { ARM_SMMU_OPT_ISOLATE_DEVICES, "arm,smmu-isolate-devices" },
+ { 0, NULL},
+};
+
+static void check_driver_options(struct arm_smmu_device *smmu)
+{
+ int i = 0;
+ do {
+ if (of_property_read_bool(smmu->dev->of_node,
+ arm_smmu_options[i].prop)) {
+ smmu->options |= arm_smmu_options[i].opt;
+ dev_dbg(smmu->dev, "option %s\n",
+ arm_smmu_options[i].prop);
+ }
+ } while (arm_smmu_options[++i].opt);
+}
+
static struct arm_smmu_master *find_smmu_master(struct arm_smmu_device *smmu,
struct device_node *dev_node)
{
@@ -1783,6 +1810,8 @@ static int arm_smmu_device_dt_probe(struct
platform_device *pdev)
}
smmu->dev = dev;
+ check_driver_options(smmu);
+
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
smmu->base = devm_ioremap_resource(dev, res);
if (IS_ERR(smmu->base))
--
1.7.9.5
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