Add SMMUv3 driver

The driver has only one API: to initialize an SMMUv3 device. This
operates on a device that implements secure state, by invalidating
secure caches and TLBs.

Change-Id: Ief32800419ddf0f1fe38c8f0da8f5ba75c72c826
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>

drivers/arm/smmu/smmu_v3.c

+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <mmio.h>
+#include <smmu_v3.h>
+
+/* Test for pending invalidate */
+#define INVAL_PENDING(base)	\
+	smmuv3_read_s_init(base) & SMMU_S_INIT_INV_ALL_MASK
+
+static inline uint32_t smmuv3_read_s_idr1(uintptr_t base)
+{
+	return mmio_read_32(base + SMMU_S_IDR1);
+}
+
+static inline uint32_t smmuv3_read_s_init(uintptr_t base)
+{
+	return mmio_read_32(base + SMMU_S_INIT);
+}
+
+static inline void smmuv3_write_s_init(uintptr_t base, uint32_t value)
+{
+	mmio_write_32(base + SMMU_S_INIT, value);
+}
+
+/*
+ * Initialize the SMMU by invalidating all secure caches and TLBs.
+ *
+ * Returns 0 on success, and -1 on failure.
+ */
+int smmuv3_init(uintptr_t smmu_base)
+{
+	uint32_t idr1_reg;
+
+	/*
+	 * Invalidation of secure caches and TLBs is required only if the SMMU
+	 * supports secure state. If not, it's implementation defined as to how
+	 * SMMU_S_INIT register is accessed.
+	 */
+	idr1_reg = smmuv3_read_s_idr1(smmu_base);
+	if (!((idr1_reg >> SMMU_S_IDR1_SECURE_IMPL_SHIFT) &
+			SMMU_S_IDR1_SECURE_IMPL_MASK)) {
+		return -1;
+	}
+
+	/* Initiate invalidation, and wait for it to finish */
+	smmuv3_write_s_init(smmu_base, SMMU_S_INIT_INV_ALL_MASK);
+	while (INVAL_PENDING(smmu_base))
+		;
+
+	return 0;
+}

include/drivers/arm/smmu_v3.h

+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __SMMU_V3_H__
+#define __SMMU_V3_H__
+
+#include <stdint.h>
+
+/* SMMUv3 register offsets from device base */
+#define SMMU_S_IDR1	0x8004
+#define SMMU_S_INIT	0x803c
+
+/* SMMU_S_IDR1 register fields */
+#define SMMU_S_IDR1_SECURE_IMPL_SHIFT	31
+#define SMMU_S_IDR1_SECURE_IMPL_MASK	0x1
+
+/* SMMU_S_INIT register fields */
+#define SMMU_S_INIT_INV_ALL_MASK	0x1
+
+
+int smmuv3_init(uintptr_t smmu_base);
+
+#endif /* __SMMU_V3_H__ */