222 lines
5.4 KiB
C
222 lines
5.4 KiB
C
/*
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* omap iommu: main structures
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*
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* Copyright (C) 2008-2009 Nokia Corporation
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*
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* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __MACH_IOMMU_H
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#define __MACH_IOMMU_H
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struct iotlb_entry {
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u32 da;
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u32 pa;
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u32 pgsz, prsvd, valid;
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union {
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u16 ap;
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struct {
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u32 endian, elsz, mixed;
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};
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};
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};
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struct omap_iommu {
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const char *name;
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struct module *owner;
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struct clk *clk;
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void __iomem *regbase;
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struct device *dev;
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void *isr_priv;
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struct iommu_domain *domain;
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unsigned int refcount;
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spinlock_t iommu_lock; /* global for this whole object */
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/*
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* We don't change iopgd for a situation like pgd for a task,
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* but share it globally for each iommu.
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*/
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u32 *iopgd;
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spinlock_t page_table_lock; /* protect iopgd */
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int nr_tlb_entries;
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struct list_head mmap;
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struct mutex mmap_lock; /* protect mmap */
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void *ctx; /* iommu context: registres saved area */
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u32 da_start;
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u32 da_end;
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};
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struct cr_regs {
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union {
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struct {
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u16 cam_l;
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u16 cam_h;
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};
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u32 cam;
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};
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union {
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struct {
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u16 ram_l;
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u16 ram_h;
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};
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u32 ram;
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};
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};
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struct iotlb_lock {
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short base;
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short vict;
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};
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/* architecture specific functions */
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struct iommu_functions {
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unsigned long version;
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int (*enable)(struct omap_iommu *obj);
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void (*disable)(struct omap_iommu *obj);
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void (*set_twl)(struct omap_iommu *obj, bool on);
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u32 (*fault_isr)(struct omap_iommu *obj, u32 *ra);
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void (*tlb_read_cr)(struct omap_iommu *obj, struct cr_regs *cr);
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void (*tlb_load_cr)(struct omap_iommu *obj, struct cr_regs *cr);
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struct cr_regs *(*alloc_cr)(struct omap_iommu *obj,
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struct iotlb_entry *e);
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int (*cr_valid)(struct cr_regs *cr);
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u32 (*cr_to_virt)(struct cr_regs *cr);
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void (*cr_to_e)(struct cr_regs *cr, struct iotlb_entry *e);
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ssize_t (*dump_cr)(struct omap_iommu *obj, struct cr_regs *cr,
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char *buf);
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u32 (*get_pte_attr)(struct iotlb_entry *e);
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void (*save_ctx)(struct omap_iommu *obj);
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void (*restore_ctx)(struct omap_iommu *obj);
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ssize_t (*dump_ctx)(struct omap_iommu *obj, char *buf, ssize_t len);
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};
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/**
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* struct omap_mmu_dev_attr - OMAP mmu device attributes for omap_hwmod
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* @da_start: device address where the va space starts.
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* @da_end: device address where the va space ends.
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* @nr_tlb_entries: number of entries supported by the translation
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* look-aside buffer (TLB).
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*/
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struct omap_mmu_dev_attr {
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u32 da_start;
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u32 da_end;
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int nr_tlb_entries;
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};
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struct iommu_platform_data {
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const char *name;
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const char *clk_name;
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const int nr_tlb_entries;
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u32 da_start;
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u32 da_end;
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};
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/**
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* struct iommu_arch_data - omap iommu private data
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* @name: name of the iommu device
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* @iommu_dev: handle of the iommu device
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*
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* This is an omap iommu private data object, which binds an iommu user
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* to its iommu device. This object should be placed at the iommu user's
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* dev_archdata so generic IOMMU API can be used without having to
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* utilize omap-specific plumbing anymore.
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*/
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struct omap_iommu_arch_data {
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const char *name;
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struct omap_iommu *iommu_dev;
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};
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#ifdef CONFIG_IOMMU_API
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/**
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* dev_to_omap_iommu() - retrieves an omap iommu object from a user device
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* @dev: iommu client device
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*/
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static inline struct omap_iommu *dev_to_omap_iommu(struct device *dev)
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{
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struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
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return arch_data->iommu_dev;
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}
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#endif
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/* IOMMU errors */
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#define OMAP_IOMMU_ERR_TLB_MISS (1 << 0)
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#define OMAP_IOMMU_ERR_TRANS_FAULT (1 << 1)
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#define OMAP_IOMMU_ERR_EMU_MISS (1 << 2)
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#define OMAP_IOMMU_ERR_TBLWALK_FAULT (1 << 3)
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#define OMAP_IOMMU_ERR_MULTIHIT_FAULT (1 << 4)
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#if defined(CONFIG_ARCH_OMAP1)
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#error "iommu for this processor not implemented yet"
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#else
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#include <plat/iommu2.h>
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#endif
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/*
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* utilities for super page(16MB, 1MB, 64KB and 4KB)
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*/
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#define iopgsz_max(bytes) \
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(((bytes) >= SZ_16M) ? SZ_16M : \
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((bytes) >= SZ_1M) ? SZ_1M : \
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((bytes) >= SZ_64K) ? SZ_64K : \
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((bytes) >= SZ_4K) ? SZ_4K : 0)
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#define bytes_to_iopgsz(bytes) \
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(((bytes) == SZ_16M) ? MMU_CAM_PGSZ_16M : \
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((bytes) == SZ_1M) ? MMU_CAM_PGSZ_1M : \
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((bytes) == SZ_64K) ? MMU_CAM_PGSZ_64K : \
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((bytes) == SZ_4K) ? MMU_CAM_PGSZ_4K : -1)
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#define iopgsz_to_bytes(iopgsz) \
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(((iopgsz) == MMU_CAM_PGSZ_16M) ? SZ_16M : \
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((iopgsz) == MMU_CAM_PGSZ_1M) ? SZ_1M : \
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((iopgsz) == MMU_CAM_PGSZ_64K) ? SZ_64K : \
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((iopgsz) == MMU_CAM_PGSZ_4K) ? SZ_4K : 0)
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#define iopgsz_ok(bytes) (bytes_to_iopgsz(bytes) >= 0)
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/*
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* global functions
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*/
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extern u32 omap_iommu_arch_version(void);
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extern void omap_iotlb_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e);
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extern int
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omap_iopgtable_store_entry(struct omap_iommu *obj, struct iotlb_entry *e);
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extern int omap_iommu_set_isr(const char *name,
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int (*isr)(struct omap_iommu *obj, u32 da, u32 iommu_errs,
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void *priv),
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void *isr_priv);
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extern void omap_iommu_save_ctx(struct device *dev);
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extern void omap_iommu_restore_ctx(struct device *dev);
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extern int omap_install_iommu_arch(const struct iommu_functions *ops);
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extern void omap_uninstall_iommu_arch(const struct iommu_functions *ops);
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extern int omap_foreach_iommu_device(void *data,
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int (*fn)(struct device *, void *));
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extern ssize_t
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omap_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t len);
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extern size_t
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omap_dump_tlb_entries(struct omap_iommu *obj, char *buf, ssize_t len);
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#endif /* __MACH_IOMMU_H */
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