omap iommu: tlb and pagetable primitives

This patch provides:

- iotlb_*()     : iommu tlb operations
- iopgtable_*() : iommu pagetable(twl) operations
- iommu_*()     : the other generic operations

and the entry points to register and acquire iommu object.

Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>

1 files changed, 72 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/iopgtable.h b/arch/arm/plat-omap/iopgtable.h
new file mode 100644
index 00000000000..37dac434c7a
--- /dev/null
+++ b/arch/arm/plat-omap/iopgtable.h
@@ -0,0 +1,72 @@
+/*
+ * omap iommu: pagetable definitions
+ *
+ * Copyright (C) 2008-2009 Nokia Corporation
+ *
+ * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __PLAT_OMAP_IOMMU_H
+#define __PLAT_OMAP_IOMMU_H
+
+#define IOPGD_SHIFT		20
+#define IOPGD_SIZE		(1 << IOPGD_SHIFT)
+#define IOPGD_MASK		(~(IOPGD_SIZE - 1))
+#define IOSECTION_MASK		IOPGD_MASK
+#define PTRS_PER_IOPGD		(1 << (32 - IOPGD_SHIFT))
+#define IOPGD_TABLE_SIZE	(PTRS_PER_IOPGD * sizeof(u32))
+
+#define IOSUPER_SIZE		(IOPGD_SIZE << 4)
+#define IOSUPER_MASK		(~(IOSUPER_SIZE - 1))
+
+#define IOPTE_SHIFT		12
+#define IOPTE_SIZE		(1 << IOPTE_SHIFT)
+#define IOPTE_MASK		(~(IOPTE_SIZE - 1))
+#define IOPAGE_MASK		IOPTE_MASK
+#define PTRS_PER_IOPTE		(1 << (IOPGD_SHIFT - IOPTE_SHIFT))
+#define IOPTE_TABLE_SIZE	(PTRS_PER_IOPTE * sizeof(u32))
+
+#define IOLARGE_SIZE		(IOPTE_SIZE << 4)
+#define IOLARGE_MASK		(~(IOLARGE_SIZE - 1))
+
+#define IOPGD_TABLE		(1 << 0)
+#define IOPGD_SECTION		(2 << 0)
+#define IOPGD_SUPER		(1 << 18 | 2 << 0)
+
+#define IOPTE_SMALL		(2 << 0)
+#define IOPTE_LARGE		(1 << 0)
+
+#define iopgd_index(da)		(((da) >> IOPGD_SHIFT) & (PTRS_PER_IOPGD - 1))
+#define iopgd_offset(obj, da)	((obj)->iopgd + iopgd_index(da))
+
+#define iopte_paddr(iopgd)	(*iopgd & ~((1 << 10) - 1))
+#define iopte_vaddr(iopgd)	((u32 *)phys_to_virt(iopte_paddr(iopgd)))
+
+#define iopte_index(da)		(((da) >> IOPTE_SHIFT) & (PTRS_PER_IOPTE - 1))
+#define iopte_offset(iopgd, da)	(iopte_vaddr(iopgd) + iopte_index(da))
+
+static inline u32 iotlb_init_entry(struct iotlb_entry *e, u32 da, u32 pa,
+				   u32 flags)
+{
+	memset(e, 0, sizeof(*e));
+
+	e->da		= da;
+	e->pa		= pa;
+	e->valid	= 1;
+	/* FIXME: add OMAP1 support */
+	e->pgsz		= flags & MMU_CAM_PGSZ_MASK;
+	e->endian	= flags & MMU_RAM_ENDIAN_MASK;
+	e->elsz		= flags & MMU_RAM_ELSZ_MASK;
+	e->mixed	= flags & MMU_RAM_MIXED_MASK;
+
+	return iopgsz_to_bytes(e->pgsz);
+}
+
+#define to_iommu(dev)							\
+	(struct iommu *)platform_get_drvdata(to_platform_device(dev))
+
+#endif /* __PLAT_OMAP_IOMMU_H */