/* SPDX-License-Identifier: GPL-2.0-only */
/*
* omap iommu : main structures
*
* Copyright ( C ) 2008 - 2009 Nokia Corporation
*
* Written by Hiroshi DOYU < Hiroshi . DOYU @ nokia . com >
*/
#ifndef _OMAP_IOMMU_H
#define _OMAP_IOMMU_H
#include <linux/bitops.h>
#include <linux/iommu.h>
#define for_each_iotlb_cr(obj, n, __i, cr) \
for (__i = 0 ; \
(__i < (n)) && (cr = __iotlb_read_cr((obj), __i), true ); \
__i++)
struct iotlb_entry {
u32 da;
u32 pa;
u32 pgsz, prsvd, valid;
u32 endian, elsz, mixed;
};
/**
* struct omap_iommu_device - omap iommu device data
* @ pgtable : page table used by an omap iommu attached to a domain
* @ iommu_dev : pointer to store an omap iommu instance attached to a domain
*/
struct omap_iommu_device {
u32 *pgtable;
struct omap_iommu *iommu_dev;
};
/**
* struct omap_iommu_domain - omap iommu domain
* @ num_iommus : number of iommus in this domain
* @ iommus : omap iommu device data for all iommus in this domain
* @ dev : Device using this domain .
* @ lock : domain lock , should be taken when attaching / detaching
* @ domain : generic domain handle used by iommu core code
*/
struct omap_iommu_domain {
u32 num_iommus;
struct omap_iommu_device *iommus;
struct device *dev;
spinlock_t lock;
struct iommu_domain domain;
};
struct omap_iommu {
const char *name;
void __iomem *regbase;
struct regmap *syscfg;
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 */
dma_addr_t pd_dma;
int nr_tlb_entries;
void *ctx; /* iommu context: registres saved area */
struct cr_regs *cr_ctx;
u32 num_cr_ctx;
int has_bus_err_back;
u32 id;
struct iommu_device iommu;
bool has_iommu_driver;
u8 pwrst;
};
/**
* struct omap_iommu_arch_data - omap iommu private data
* @ iommu_dev : handle of the OMAP iommu device
* @ dev : handle of the iommu device
*
* This is an omap iommu private data object , which binds an iommu user
* to its iommu device . This object should be placed at the iommu user ' s
* dev_archdata so generic IOMMU API can be used without having to
* utilize omap - specific plumbing anymore .
*/
struct omap_iommu_arch_data {
struct omap_iommu *iommu_dev;
struct device *dev;
};
struct cr_regs {
u32 cam;
u32 ram;
};
struct iotlb_lock {
short base;
short vict;
};
/*
* MMU Register offsets
*/
#define MMU_REVISION 0 x00
#define MMU_IRQSTATUS 0 x18
#define MMU_IRQENABLE 0 x1c
#define MMU_WALKING_ST 0 x40
#define MMU_CNTL 0 x44
#define MMU_FAULT_AD 0 x48
#define MMU_TTB 0 x4c
#define MMU_LOCK 0 x50
#define MMU_LD_TLB 0 x54
#define MMU_CAM 0 x58
#define MMU_RAM 0 x5c
#define MMU_GFLUSH 0 x60
#define MMU_FLUSH_ENTRY 0 x64
#define MMU_READ_CAM 0 x68
#define MMU_READ_RAM 0 x6c
#define MMU_EMU_FAULT_AD 0 x70
#define MMU_GP_REG 0 x88
#define MMU_REG_SIZE 256
/*
* MMU Register bit definitions
*/
/* IRQSTATUS & IRQENABLE */
#define MMU_IRQ_MULTIHITFAULT BIT(4 )
#define MMU_IRQ_TABLEWALKFAULT BIT(3 )
#define MMU_IRQ_EMUMISS BIT(2 )
#define MMU_IRQ_TRANSLATIONFAULT BIT(1 )
#define MMU_IRQ_TLBMISS BIT(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 BIT(3 )
#define MMU_CNTL_TWL_EN BIT(2 )
#define MMU_CNTL_MMU_EN BIT(1 )
/* CAM */
#define MMU_CAM_VATAG_SHIFT 12
#define MMU_CAM_VATAG_MASK \
((~0 UL >> MMU_CAM_VATAG_SHIFT) << MMU_CAM_VATAG_SHIFT)
#define MMU_CAM_P BIT(3 )
#define MMU_CAM_V BIT(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 \
((~0 UL >> MMU_RAM_PADDR_SHIFT) << MMU_RAM_PADDR_SHIFT)
#define MMU_RAM_ENDIAN_SHIFT 9
#define MMU_RAM_ENDIAN_MASK BIT(MMU_RAM_ENDIAN_SHIFT)
#define MMU_RAM_ENDIAN_LITTLE (0 << MMU_RAM_ENDIAN_SHIFT)
#define MMU_RAM_ENDIAN_BIG BIT(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 BIT(MMU_RAM_MIXED_SHIFT)
#define MMU_RAM_MIXED MMU_RAM_MIXED_MASK
#define MMU_GP_REG_BUS_ERR_BACK_EN 0 x1
#define get_cam_va_mask(pgsz) \
(((pgsz) == MMU_CAM_PGSZ_16M) ? 0 xff000000 : \
((pgsz) == MMU_CAM_PGSZ_1M) ? 0 xfff00000 : \
((pgsz) == MMU_CAM_PGSZ_64K) ? 0 xffff0000 : \
((pgsz) == MMU_CAM_PGSZ_4K) ? 0 xfffff000 : 0 )
/*
* DSP_SYSTEM registers and bit definitions ( applicable only for DRA7xx DSP )
*/
#define DSP_SYS_REVISION 0 x00
#define DSP_SYS_MMU_CONFIG 0 x18
#define DSP_SYS_MMU_CONFIG_EN_SHIFT 4
/*
* utilities for super page ( 16 MB , 1 MB , 64 KB and 4 KB )
*/
#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
*/
struct cr_regs __iotlb_read_cr(struct omap_iommu *obj, int n);
void iotlb_lock_get(struct omap_iommu *obj, struct iotlb_lock *l);
void iotlb_lock_set(struct omap_iommu *obj, struct iotlb_lock *l);
#ifdef CONFIG_OMAP_IOMMU_DEBUG
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);
}
static inline int iotlb_cr_valid(struct cr_regs *cr)
{
if (!cr)
return -EINVAL;
return cr->cam & MMU_CAM_V;
}
#endif /* _OMAP_IOMMU_H */
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