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linux/drivers/iommu/omap-iommu.h
Suman Anna 9d5018deec iommu/omap: Add support to program multiple iommus 
A client user instantiates and attaches to an iommu_domain to
program the OMAP IOMMU associated with the domain. The iommus
programmed by a client user are bound with the iommu_domain
through the user's device archdata. The OMAP IOMMU driver
currently supports only one IOMMU per IOMMU domain per user.

The OMAP IOMMU driver has been enhanced to support allowing
multiple IOMMUs to be programmed by a single client user. This
support is being added mainly to handle the DSP subsystems on
the DRA7xx SoCs, which have two MMUs within the same subsystem.
These MMUs provide translations for a processor core port and
an internal EDMA port. This support allows both the MMUs to
be programmed together, but with each one retaining it's own
internal state objects. The internal EDMA block is managed by
the software running on the DSPs, and this design provides
on-par functionality with previous generation OMAP DSPs where
the EDMA and the DSP core shared the same MMU.

The multiple iommus are expected to be provided through a
sentinel terminated array of omap_iommu_arch_data objects
through the client user's device archdata. The OMAP driver
core is enhanced to loop through the array of attached
iommus and program them for all common operations. The
sentinel-terminated logic is used so as to not change the
omap_iommu_arch_data structure.

NOTE:
1. The IOMMU group and IOMMU core registration is done only for
   the DSP processor core MMU even though both MMUs are represented
   by their own platform device and are probed individually. The
   IOMMU device linking uses this registered MMU device. The struct
   iommu_device for the second MMU is not used even though memory
   for it is allocated.
2. The OMAP IOMMU debugfs code still continues to operate on
   individual IOMMU objects.

Signed-off-by: Suman Anna <s-anna@ti.com>
[t-kristo@ti.com: ported support to 4.13 based kernel]
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-09-19 11:32:05 +02:00

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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
#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 */
int has_bus_err_back;
u32 id;
struct iommu_device iommu;
struct iommu_group *group;
};
/**
* struct omap_iommu_arch_data - omap iommu private data
* @iommu_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 cr_regs {
u32 cam;
u32 ram;
};
struct iotlb_lock {
short base;
short vict;
};
/*
* 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 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 \
((~0UL >> 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 \
((~0UL >> 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 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)
/*
* DSP_SYSTEM registers and bit definitions (applicable only for DRA7xx DSP)
*/
#define DSP_SYS_REVISION 0x00
#define DSP_SYS_MMU_CONFIG 0x18
#define DSP_SYS_MMU_CONFIG_EN_SHIFT 4
/*
* 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
*/
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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