/*
* 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);
void (*set_twl)(struct iommu *obj, bool on);
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, ssize_t len);
};
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 <plat/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 iommu_set_twl(struct iommu *obj, bool on);
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, ssize_t len);
extern size_t dump_tlb_entries(struct iommu *obj, char *buf, ssize_t len);
#endif /* __MACH_IOMMU_H */
