iommu: arm-smmu: Add SMMU suspend support

Allocate memory required to store multiple SMMU registers.
Fill memory with register address-value pair during suspend.
Write memory start address pfn to scratch register that will be
used by warmboot for restoring registers from memory.

Bug 200383912

Change-Id: I001788684571af9e92d4c269272daf54e6a34671
Signed-off-by: Pritesh Raithatha <praithatha@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1746963
GVS: Gerrit_Virtual_Submit
Reviewed-by: Sachin Nikam <snikam@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/include/linux/arm-smmu-suspend.h b/include/linux/arm-smmu-suspend.h
new file mode 100644
index 000000000..607d2eecc
--- /dev/null
+++ b/include/linux/arm-smmu-suspend.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2018 NVIDIA Corporation.  All rights reserved.
+ *
+ * NVIDIA Corporation and its licensors retain all intellectual property
+ * and proprietary rights in and to this software and related documentation
+ * and any modifications thereto.  Any use, reproduction, disclosure or
+ * distribution of this software and related documentation without an express
+ * license agreement from NVIDIA Corporation is strictly prohibited.
+ */
+
+#ifndef _ARM_SMMU_SUSPEND_H
+#define _ARM_SMMU_SUSPEND_H
+
+#ifdef CONFIG_PM_SLEEP
+int arm_smmu_suspend_init(void __iomem **smmu_base, u32 *smmu_base_pa,
+                                int num_smmus, unsigned long smmu_size,
+                                unsigned long smmu_pgshift, u32 scratch_reg_pa);
+void arm_smmu_suspend_exit(void);
+#else
+int arm_smmu_suspend_init(void __iomem **smmu_base, u32 *smmu_base_pa,
+                                int num_smmus, unsigned long smmu_size,
+                                unsigned long smmu_pgshift, u32 scratch_reg_pa)
+{
+        return 0;
+}
+void arm_smmu_suspend_exit(void) {}
+#endif
+
+#endif