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, 168 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/include/mach/iommu.h b/arch/arm/plat-omap/include/mach/iommu.h
new file mode 100644
index 000000000000..769b00b4c34a
--- /dev/null
+++ b/arch/arm/plat-omap/include/mach/iommu.h
@@ -0,0 +1,168 @@
+/*
+ * omap iommu: main structures
+ *
+ * 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 __MACH_IOMMU_H
+#define __MACH_IOMMU_H
+
+struct iotlb_entry {
+        u32 da;
+        u32 pa;
+        u32 pgsz, prsvd, valid;
+        union {
+                u16 ap;
+                struct {
+                        u32 endian, elsz, mixed;
+                };
+        };
+};
+
+struct iommu {
+        const char      *name;
+        struct module   *owner;
+        struct clk      *clk;
+        void __iomem    *regbase;
+        struct device   *dev;
+
+        unsigned int    refcount;
+        struct mutex    iommu_lock;     /* global for this whole object */
+
+        /*
+         * We don't change iopgd for a situation like pgd for a task,
+         * but share it globally for each iommu.
+         */
+        u32             *iopgd;
+        spinlock_t      page_table_lock; /* protect iopgd */
+
+        int             nr_tlb_entries;
+
+        struct list_head        mmap;
+        struct mutex            mmap_lock; /* protect mmap */
+
+        int (*isr)(struct iommu *obj);
+
+        void *ctx; /* iommu context: registres saved area */
+};
+
+struct cr_regs {
+        union {
+                struct {
+                        u16 cam_l;
+                        u16 cam_h;
+                };
+                u32 cam;
+        };
+        union {
+                struct {
+                        u16 ram_l;
+                        u16 ram_h;
+                };
+                u32 ram;
+        };
+};
+
+struct iotlb_lock {
+        short base;
+        short vict;
+};
+
+/* architecture specific functions */
+struct iommu_functions {
+        unsigned long   version;
+
+        int (*enable)(struct iommu *obj);
+        void (*disable)(struct iommu *obj);
+        u32 (*fault_isr)(struct iommu *obj, u32 *ra);
+
+        void (*tlb_read_cr)(struct iommu *obj, struct cr_regs *cr);
+        void (*tlb_load_cr)(struct iommu *obj, struct cr_regs *cr);
+
+        struct cr_regs *(*alloc_cr)(struct iommu *obj, struct iotlb_entry *e);
+        int (*cr_valid)(struct cr_regs *cr);
+        u32 (*cr_to_virt)(struct cr_regs *cr);
+        void (*cr_to_e)(struct cr_regs *cr, struct iotlb_entry *e);
+        ssize_t (*dump_cr)(struct iommu *obj, struct cr_regs *cr, char *buf);
+
+        u32 (*get_pte_attr)(struct iotlb_entry *e);
+
+        void (*save_ctx)(struct iommu *obj);
+        void (*restore_ctx)(struct iommu *obj);
+        ssize_t (*dump_ctx)(struct iommu *obj, char *buf);
+};
+
+struct iommu_platform_data {
+        const char *name;
+        const char *clk_name;
+        const int nr_tlb_entries;
+};
+
+#if defined(CONFIG_ARCH_OMAP1)
+#error "iommu for this processor not implemented yet"
+#else
+#include <mach/iommu2.h>
+#endif
+
+/*
+ * utilities for super page(16MB, 1MB, 64KB and 4KB)
+ */
+
+#define iopgsz_max(bytes)                       \
+        (((bytes) >= SZ_16M) ? SZ_16M :         \
+         ((bytes) >= SZ_1M)  ? SZ_1M  :         \
+         ((bytes) >= SZ_64K) ? SZ_64K :         \
+         ((bytes) >= SZ_4K)  ? SZ_4K  : 0)
+
+#define bytes_to_iopgsz(bytes)                          \
+        (((bytes) == SZ_16M) ? MMU_CAM_PGSZ_16M :       \
+         ((bytes) == SZ_1M)  ? MMU_CAM_PGSZ_1M  :       \
+         ((bytes) == SZ_64K) ? MMU_CAM_PGSZ_64K :       \
+         ((bytes) == SZ_4K)  ? MMU_CAM_PGSZ_4K  : -1)
+
+#define iopgsz_to_bytes(iopgsz)                         \
+        (((iopgsz) == MMU_CAM_PGSZ_16M) ? SZ_16M :      \
+         ((iopgsz) == MMU_CAM_PGSZ_1M)  ? SZ_1M  :      \
+         ((iopgsz) == MMU_CAM_PGSZ_64K) ? SZ_64K :      \
+         ((iopgsz) == MMU_CAM_PGSZ_4K)  ? SZ_4K  : 0)
+
+#define iopgsz_ok(bytes) (bytes_to_iopgsz(bytes) >= 0)
+
+/*
+ * global functions
+ */
+extern u32 iommu_arch_version(void);
+
+extern void iotlb_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e);
+extern u32 iotlb_cr_to_virt(struct cr_regs *cr);
+
+extern int load_iotlb_entry(struct iommu *obj, struct iotlb_entry *e);
+extern void flush_iotlb_page(struct iommu *obj, u32 da);
+extern void flush_iotlb_range(struct iommu *obj, u32 start, u32 end);
+extern void flush_iotlb_all(struct iommu *obj);
+
+extern int iopgtable_store_entry(struct iommu *obj, struct iotlb_entry *e);
+extern size_t iopgtable_clear_entry(struct iommu *obj, u32 iova);
+
+extern struct iommu *iommu_get(const char *name);
+extern void iommu_put(struct iommu *obj);
+
+extern void iommu_save_ctx(struct iommu *obj);
+extern void iommu_restore_ctx(struct iommu *obj);
+
+extern int install_iommu_arch(const struct iommu_functions *ops);
+extern void uninstall_iommu_arch(const struct iommu_functions *ops);
+
+extern int foreach_iommu_device(void *data,
+                                int (*fn)(struct device *, void *));
+
+extern ssize_t iommu_dump_ctx(struct iommu *obj, char *buf);
+extern size_t dump_tlb_entries(struct iommu *obj, char *buf);
+
+#endif /* __MACH_IOMMU_H */