142 lines
3.9 KiB
C
142 lines
3.9 KiB
C
/*
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* Copyright (C) 2007-2013 ST-Ericsson
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* License terms: GNU General Public License (GPL) version 2
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* DMA driver for COH 901 318
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* Author: Per Friden <per.friden@stericsson.com>
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*/
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#ifndef COH901318_H
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#define COH901318_H
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#define MAX_DMA_PACKET_SIZE_SHIFT 11
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#define MAX_DMA_PACKET_SIZE (1 << MAX_DMA_PACKET_SIZE_SHIFT)
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struct device;
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struct coh901318_pool {
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spinlock_t lock;
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struct dma_pool *dmapool;
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struct device *dev;
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#ifdef CONFIG_DEBUG_FS
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int debugfs_pool_counter;
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#endif
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};
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/**
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* struct coh901318_lli - linked list item for DMAC
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* @control: control settings for DMAC
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* @src_addr: transfer source address
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* @dst_addr: transfer destination address
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* @link_addr: physical address to next lli
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* @virt_link_addr: virtual address of next lli (only used by pool_free)
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* @phy_this: physical address of current lli (only used by pool_free)
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*/
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struct coh901318_lli {
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u32 control;
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dma_addr_t src_addr;
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dma_addr_t dst_addr;
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dma_addr_t link_addr;
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void *virt_link_addr;
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dma_addr_t phy_this;
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};
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/**
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* coh901318_pool_create() - Creates an dma pool for lli:s
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* @pool: pool handle
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* @dev: dma device
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* @lli_nbr: number of lli:s in the pool
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* @algin: address alignemtn of lli:s
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* returns 0 on success otherwise none zero
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*/
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int coh901318_pool_create(struct coh901318_pool *pool,
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struct device *dev,
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size_t lli_nbr, size_t align);
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/**
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* coh901318_pool_destroy() - Destroys the dma pool
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* @pool: pool handle
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* returns 0 on success otherwise none zero
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*/
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int coh901318_pool_destroy(struct coh901318_pool *pool);
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/**
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* coh901318_lli_alloc() - Allocates a linked list
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*
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* @pool: pool handle
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* @len: length to list
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* return: none NULL if success otherwise NULL
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*/
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struct coh901318_lli *
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coh901318_lli_alloc(struct coh901318_pool *pool,
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unsigned int len);
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/**
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* coh901318_lli_free() - Returns the linked list items to the pool
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* @pool: pool handle
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* @lli: reference to lli pointer to be freed
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*/
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void coh901318_lli_free(struct coh901318_pool *pool,
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struct coh901318_lli **lli);
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/**
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* coh901318_lli_fill_memcpy() - Prepares the lli:s for dma memcpy
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* @pool: pool handle
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* @lli: allocated lli
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* @src: src address
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* @size: transfer size
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* @dst: destination address
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* @ctrl_chained: ctrl for chained lli
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* @ctrl_last: ctrl for the last lli
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* returns number of CPU interrupts for the lli, negative on error.
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*/
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int
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coh901318_lli_fill_memcpy(struct coh901318_pool *pool,
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struct coh901318_lli *lli,
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dma_addr_t src, unsigned int size,
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dma_addr_t dst, u32 ctrl_chained, u32 ctrl_last);
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/**
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* coh901318_lli_fill_single() - Prepares the lli:s for dma single transfer
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* @pool: pool handle
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* @lli: allocated lli
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* @buf: transfer buffer
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* @size: transfer size
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* @dev_addr: address of periphal
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* @ctrl_chained: ctrl for chained lli
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* @ctrl_last: ctrl for the last lli
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* @dir: direction of transfer (to or from device)
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* returns number of CPU interrupts for the lli, negative on error.
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*/
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int
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coh901318_lli_fill_single(struct coh901318_pool *pool,
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struct coh901318_lli *lli,
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dma_addr_t buf, unsigned int size,
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dma_addr_t dev_addr, u32 ctrl_chained, u32 ctrl_last,
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enum dma_transfer_direction dir);
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/**
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* coh901318_lli_fill_single() - Prepares the lli:s for dma scatter list transfer
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* @pool: pool handle
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* @lli: allocated lli
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* @sg: scatter gather list
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* @nents: number of entries in sg
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* @dev_addr: address of periphal
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* @ctrl_chained: ctrl for chained lli
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* @ctrl: ctrl of middle lli
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* @ctrl_last: ctrl for the last lli
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* @dir: direction of transfer (to or from device)
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* @ctrl_irq_mask: ctrl mask for CPU interrupt
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* returns number of CPU interrupts for the lli, negative on error.
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*/
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int
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coh901318_lli_fill_sg(struct coh901318_pool *pool,
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struct coh901318_lli *lli,
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struct scatterlist *sg, unsigned int nents,
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dma_addr_t dev_addr, u32 ctrl_chained,
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u32 ctrl, u32 ctrl_last,
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enum dma_transfer_direction dir, u32 ctrl_irq_mask);
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#endif /* COH901318_H */
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