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/*
* 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 _OMAP_IOMMU_H
#define _OMAP_IOMMU_H
struct iotlb_entry {
u32 da;
u32 pa;
u32 pgsz, prsvd, valid;
union {
u16 ap;
struct {
u32 endian, elsz, mixed;
};
};
};
struct omap_iommu {
const char *name;
void __iomem *regbase;
struct device *dev;
struct iommu_domain *domain;
struct dentry *debug_dir;
spinlock_t 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;
void *ctx; /* iommu context: registres saved area */
int has_bus_err_back;
};
struct cr_regs {
union {
struct {
u16 cam_l;
u16 cam_h;
};
u32 cam;
};
union {
struct {
u16 ram_l;
u16 ram_h;
};
u32 ram;
};
};
/**
* dev_to_omap_iommu() - retrieves an omap iommu object from a user device
* @dev: iommu client device
*/
static inline struct omap_iommu *dev_to_omap_iommu(struct device *dev)
{
struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
return arch_data->iommu_dev;
}
/*
* MMU Register offsets
*/
#define MMU_REVISION 0x00
#define MMU_IRQSTATUS 0x18
#define MMU_IRQENABLE 0x1c
#define MMU_WALKING_ST 0x40
#define MMU_CNTL 0x44
#define MMU_FAULT_AD 0x48
#define MMU_TTB 0x4c
#define MMU_LOCK 0x50
#define MMU_LD_TLB 0x54
#define MMU_CAM 0x58
#define MMU_RAM 0x5c
#define MMU_GFLUSH 0x60
#define MMU_FLUSH_ENTRY 0x64
#define MMU_READ_CAM 0x68
#define MMU_READ_RAM 0x6c
#define MMU_EMU_FAULT_AD 0x70
#define MMU_GP_REG 0x88
#define MMU_REG_SIZE 256
/*
* MMU Register bit definitions
*/
/* IRQSTATUS & IRQENABLE */
#define MMU_IRQ_MULTIHITFAULT (1 << 4)
#define MMU_IRQ_TABLEWALKFAULT (1 << 3)
#define MMU_IRQ_EMUMISS (1 << 2)
#define MMU_IRQ_TRANSLATIONFAULT (1 << 1)
#define MMU_IRQ_TLBMISS (1 << 0)
#define __MMU_IRQ_FAULT \
(MMU_IRQ_MULTIHITFAULT | MMU_IRQ_EMUMISS | MMU_IRQ_TRANSLATIONFAULT)
#define MMU_IRQ_MASK \
(__MMU_IRQ_FAULT | MMU_IRQ_TABLEWALKFAULT | MMU_IRQ_TLBMISS)
#define MMU_IRQ_TWL_MASK (__MMU_IRQ_FAULT | MMU_IRQ_TABLEWALKFAULT)
#define MMU_IRQ_TLB_MISS_MASK (__MMU_IRQ_FAULT | MMU_IRQ_TLBMISS)
/* MMU_CNTL */
#define MMU_CNTL_SHIFT 1
#define MMU_CNTL_MASK (7 << MMU_CNTL_SHIFT)
#define MMU_CNTL_EML_TLB (1 << 3)
#define MMU_CNTL_TWL_EN (1 << 2)
#define MMU_CNTL_MMU_EN (1 << 1)
/* CAM */
#define MMU_CAM_VATAG_SHIFT 12
#define MMU_CAM_VATAG_MASK \
((~0UL >> MMU_CAM_VATAG_SHIFT) << MMU_CAM_VATAG_SHIFT)
#define MMU_CAM_P (1 << 3)
#define MMU_CAM_V (1 << 2)
#define MMU_CAM_PGSZ_MASK 3
#define MMU_CAM_PGSZ_1M (0 << 0)
#define MMU_CAM_PGSZ_64K (1 << 0)
#define MMU_CAM_PGSZ_4K (2 << 0)
#define MMU_CAM_PGSZ_16M (3 << 0)
/* RAM */
#define MMU_RAM_PADDR_SHIFT 12
#define MMU_RAM_PADDR_MASK \
((~0UL >> MMU_RAM_PADDR_SHIFT) << MMU_RAM_PADDR_SHIFT)
#define MMU_RAM_ENDIAN_SHIFT 9
#define MMU_RAM_ENDIAN_MASK (1 << MMU_RAM_ENDIAN_SHIFT)
#define MMU_RAM_ENDIAN_LITTLE (0 << MMU_RAM_ENDIAN_SHIFT)
#define MMU_RAM_ENDIAN_BIG (1 << MMU_RAM_ENDIAN_SHIFT)
#define MMU_RAM_ELSZ_SHIFT 7
#define MMU_RAM_ELSZ_MASK (3 << MMU_RAM_ELSZ_SHIFT)
#define MMU_RAM_ELSZ_8 (0 << MMU_RAM_ELSZ_SHIFT)
#define MMU_RAM_ELSZ_16 (1 << MMU_RAM_ELSZ_SHIFT)
#define MMU_RAM_ELSZ_32 (2 << MMU_RAM_ELSZ_SHIFT)
#define MMU_RAM_ELSZ_NONE (3 << MMU_RAM_ELSZ_SHIFT)
#define MMU_RAM_MIXED_SHIFT 6
#define MMU_RAM_MIXED_MASK (1 << MMU_RAM_MIXED_SHIFT)
#define MMU_RAM_MIXED MMU_RAM_MIXED_MASK
#define MMU_GP_REG_BUS_ERR_BACK_EN 0x1
#define get_cam_va_mask(pgsz) \
(((pgsz) == MMU_CAM_PGSZ_16M) ? 0xff000000 : \
((pgsz) == MMU_CAM_PGSZ_1M) ? 0xfff00000 : \
((pgsz) == MMU_CAM_PGSZ_64K) ? 0xffff0000 : \
((pgsz) == MMU_CAM_PGSZ_4K) ? 0xfffff000 : 0)
/*
* 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 void omap_iotlb_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e);
extern int
omap_iopgtable_store_entry(struct omap_iommu *obj, struct iotlb_entry *e);
extern int omap_foreach_iommu_device(void *data,
int (*fn)(struct device *, void *));
#ifdef CONFIG_OMAP_IOMMU_DEBUG
extern ssize_t
omap_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t len);
extern size_t
omap_dump_tlb_entries(struct omap_iommu *obj, char *buf, ssize_t len);
void omap_iommu_debugfs_init(void);
void omap_iommu_debugfs_exit(void);
void omap_iommu_debugfs_add(struct omap_iommu *obj);
void omap_iommu_debugfs_remove(struct omap_iommu *obj);
#else
static inline void omap_iommu_debugfs_init(void) { }
static inline void omap_iommu_debugfs_exit(void) { }
static inline void omap_iommu_debugfs_add(struct omap_iommu *obj) { }
static inline void omap_iommu_debugfs_remove(struct omap_iommu *obj) { }
#endif
/*
* register accessors
*/
static inline u32 iommu_read_reg(struct omap_iommu *obj, size_t offs)
{
return __raw_readl(obj->regbase + offs);
}
static inline void iommu_write_reg(struct omap_iommu *obj, u32 val, size_t offs)
{
__raw_writel(val, obj->regbase + offs);
}
#endif /* _OMAP_IOMMU_H */
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