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/*
*
* (C) COPYRIGHT 2014-2015 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU licence.
*
* A copy of the licence is included with the program, and can also be obtained
* from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
/**
* @file
* Interface file for accessing MMU hardware functionality
*/
/**
* @page mali_kbase_mmu_hw_page MMU hardware interface
*
* @section mali_kbase_mmu_hw_intro_sec Introduction
* This module provides an abstraction for accessing the functionality provided
* by the midgard MMU and thus allows all MMU HW access to be contained within
* one common place and allows for different backends (implementations) to
* be provided.
*/
#ifndef _MALI_KBASE_MMU_HW_H_
#define _MALI_KBASE_MMU_HW_H_
/* Forward declarations */
struct kbase_device;
struct kbase_as;
struct kbase_context;
/**
* @addtogroup base_kbase_api
* @{
*/
/**
* @addtogroup mali_kbase_mmu_hw MMU access APIs
* @{
*/
/** @brief MMU fault type descriptor.
*/
enum kbase_mmu_fault_type {
KBASE_MMU_FAULT_TYPE_UNKNOWN = 0,
KBASE_MMU_FAULT_TYPE_PAGE,
KBASE_MMU_FAULT_TYPE_BUS,
KBASE_MMU_FAULT_TYPE_PAGE_UNEXPECTED,
KBASE_MMU_FAULT_TYPE_BUS_UNEXPECTED
};
/** @brief Configure an address space for use.
*
* Configure the MMU using the address space details setup in the
* @ref kbase_context structure.
*
* @param[in] kbdev kbase device to configure.
* @param[in] as address space to configure.
* @param[in] kctx kbase context to configure.
*/
void kbase_mmu_hw_configure(struct kbase_device *kbdev,
struct kbase_as *as, struct kbase_context *kctx);
/** @brief Issue an operation to the MMU.
*
* Issue an operation (MMU invalidate, MMU flush, etc) on the address space that
* is associated with the provided @ref kbase_context over the specified range
*
* @param[in] kbdev kbase device to issue the MMU operation on.
* @param[in] as address space to issue the MMU operation on.
* @param[in] kctx kbase context to issue the MMU operation on.
* @param[in] vpfn MMU Virtual Page Frame Number to start the
* operation on.
* @param[in] nr Number of pages to work on.
* @param[in] type Operation type (written to ASn_COMMAND).
* @param[in] handling_irq Is this operation being called during the handling
* of an interrupt?
*
* @return Zero if the operation was successful, non-zero otherwise.
*/
int kbase_mmu_hw_do_operation(struct kbase_device *kbdev, struct kbase_as *as,
struct kbase_context *kctx, u64 vpfn, u32 nr, u32 type,
unsigned int handling_irq);
/** @brief Clear a fault that has been previously reported by the MMU.
*
* Clear a bus error or page fault that has been reported by the MMU.
*
* @param[in] kbdev kbase device to clear the fault from.
* @param[in] as address space to clear the fault from.
* @param[in] kctx kbase context to clear the fault from or NULL.
* @param[in] type The type of fault that needs to be cleared.
*/
void kbase_mmu_hw_clear_fault(struct kbase_device *kbdev, struct kbase_as *as,
struct kbase_context *kctx, enum kbase_mmu_fault_type type);
/** @brief Enable fault that has been previously reported by the MMU.
*
* After a page fault or bus error has been reported by the MMU these
* will be disabled. After these are handled this function needs to be
* called to enable the page fault or bus error fault again.
*
* @param[in] kbdev kbase device to again enable the fault from.
* @param[in] as address space to again enable the fault from.
* @param[in] kctx kbase context to again enable the fault from.
* @param[in] type The type of fault that needs to be enabled again.
*/
void kbase_mmu_hw_enable_fault(struct kbase_device *kbdev, struct kbase_as *as,
struct kbase_context *kctx, enum kbase_mmu_fault_type type);
/** @} *//* end group mali_kbase_mmu_hw */
/** @} *//* end group base_kbase_api */
#endif /* _MALI_KBASE_MMU_HW_H_ */
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