cd391e206f
Remove the limitation of PAGE_SIZE to be 4k by defining the own page size and macros for 4k. 8kb page size could be natively supported, but it's disabled right now for simplicity. Also, clean up using upper_32_bits() macro. Signed-off-by: Takashi Iwai <tiwai@suse.de>
58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/**
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* Copyright (C) 2008, Creative Technology Ltd. All Rights Reserved.
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*
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* This source file is released under GPL v2 license (no other versions).
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* See the COPYING file included in the main directory of this source
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* distribution for the license terms and conditions.
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*
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* @File ctvmem.h
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*
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* @Brief
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* This file contains the definition of virtual memory management object
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* for card device.
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*
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* @Author Liu Chun
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* @Date Mar 28 2008
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*/
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#ifndef CTVMEM_H
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#define CTVMEM_H
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#define CT_PTP_NUM 1 /* num of device page table pages */
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#include <linux/mutex.h>
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#include <linux/list.h>
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/* The chip can handle the page table of 4k pages
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* (emu20k1 can handle even 8k pages, but we don't use it right now)
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*/
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#define CT_PAGE_SIZE 4096
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#define CT_PAGE_SHIFT 12
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#define CT_PAGE_MASK (~(PAGE_SIZE - 1))
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#define CT_PAGE_ALIGN(addr) ALIGN(addr, CT_PAGE_SIZE)
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struct ct_vm_block {
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unsigned int addr; /* starting logical addr of this block */
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unsigned int size; /* size of this device virtual mem block */
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struct list_head list;
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};
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/* Virtual memory management object for card device */
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struct ct_vm {
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void *ptp[CT_PTP_NUM]; /* Device page table pages */
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unsigned int size; /* Available addr space in bytes */
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struct list_head unused; /* List of unused blocks */
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struct list_head used; /* List of used blocks */
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struct mutex lock;
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/* Map host addr (kmalloced/vmalloced) to device logical addr. */
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struct ct_vm_block *(*map)(struct ct_vm *, void *host_addr, int size);
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/* Unmap device logical addr area. */
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void (*unmap)(struct ct_vm *, struct ct_vm_block *block);
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void *(*get_ptp_virt)(struct ct_vm *vm, int index);
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};
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int ct_vm_create(struct ct_vm **rvm);
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void ct_vm_destroy(struct ct_vm *vm);
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#endif /* CTVMEM_H */
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