Added a header file fsl_mc_smmu.h to provide basic support of creating
an IOMMU group for a fsl-mc type device and also provide helper macro
to get the stream ID of fsl-mc tyoe device.
Signed-off-by: Nipun Gupta <nipun.gu...@nxp.com>
Signed-off-by: Bharat Bhushan <bharat.bhus...@nxp.com>
---
drivers/staging/fsl-mc/include/fsl_mc_smmu.h | 45 ++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
create mode 100644 drivers/staging/fsl-mc/include/fsl_mc_smmu.h
diff --git a/drivers/staging/fsl-mc/include/fsl_mc_smmu.h
b/drivers/staging/fsl-mc/include/fsl_mc_smmu.h
new file mode 100644
index 0000000..9dff5ba
--- /dev/null
+++ b/drivers/staging/fsl-mc/include/fsl_mc_smmu.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ * Author: Nipun Gupta <nipun.gu...@freescale.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#ifndef _FSL_MC_SMMU_H_
+#define _FSL_MC_SMMU_H_
+
+#include <../drivers/staging/fsl-mc/include/mc.h>
+
+/* Macro to get the MC device ICID (Stream ID) */
+#define fslmc_dev_streamid(_dev) (to_fsl_mc_device(_dev)->icid)
+
+/* Macro to get the container device of a MC device */
+#define fslmc_cont_dev(_dev) ((to_fsl_mc_device(dev)->flags & \
+ FSL_MC_IS_DPRC) ? (_dev) : (_dev->parent))
+
+/* Macro to check if a device is a container device */
+#define is_cont_dev(_dev) (to_fsl_mc_device(_dev)->flags & FSL_MC_IS_DPRC)
+
+static struct iommu_group *fslmc_device_group(struct device *dev)
+{
+ struct device *cont_dev = fslmc_cont_dev(dev);
+ struct iommu_group *group;
+
+ /* Container device is responsible for creating the iommu group */
+ if (is_cont_dev(dev)) {
+ group = iommu_group_alloc();
+
+ if (IS_ERR(group))
+ return NULL;
+ } else {
+ get_device(cont_dev);
+ group = iommu_group_get(cont_dev);
+ put_device(cont_dev);
+ }
+
+ return group;
+}
+
+#endif /* _FSL_MC_SMMU_H_ */
--
1.9.1
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