forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
141 lines
3.9 KiB
141 lines
3.9 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
|
/* |
|
* Copyright (C) 2007-2013 ST-Ericsson |
|
* DMA driver for COH 901 318 |
|
* Author: Per Friden <[email protected]> |
|
*/ |
|
|
|
#ifndef COH901318_H |
|
#define COH901318_H |
|
|
|
#define MAX_DMA_PACKET_SIZE_SHIFT 11 |
|
#define MAX_DMA_PACKET_SIZE (1 << MAX_DMA_PACKET_SIZE_SHIFT) |
|
|
|
struct device; |
|
|
|
struct coh901318_pool { |
|
spinlock_t lock; |
|
struct dma_pool *dmapool; |
|
struct device *dev; |
|
|
|
#ifdef CONFIG_DEBUG_FS |
|
int debugfs_pool_counter; |
|
#endif |
|
}; |
|
|
|
/** |
|
* struct coh901318_lli - linked list item for DMAC |
|
* @control: control settings for DMAC |
|
* @src_addr: transfer source address |
|
* @dst_addr: transfer destination address |
|
* @link_addr: physical address to next lli |
|
* @virt_link_addr: virtual address of next lli (only used by pool_free) |
|
* @phy_this: physical address of current lli (only used by pool_free) |
|
*/ |
|
struct coh901318_lli { |
|
u32 control; |
|
dma_addr_t src_addr; |
|
dma_addr_t dst_addr; |
|
dma_addr_t link_addr; |
|
|
|
void *virt_link_addr; |
|
dma_addr_t phy_this; |
|
}; |
|
|
|
/** |
|
* coh901318_pool_create() - Creates an dma pool for lli:s |
|
* @pool: pool handle |
|
* @dev: dma device |
|
* @lli_nbr: number of lli:s in the pool |
|
* @algin: address alignemtn of lli:s |
|
* returns 0 on success otherwise none zero |
|
*/ |
|
int coh901318_pool_create(struct coh901318_pool *pool, |
|
struct device *dev, |
|
size_t lli_nbr, size_t align); |
|
|
|
/** |
|
* coh901318_pool_destroy() - Destroys the dma pool |
|
* @pool: pool handle |
|
* returns 0 on success otherwise none zero |
|
*/ |
|
int coh901318_pool_destroy(struct coh901318_pool *pool); |
|
|
|
/** |
|
* coh901318_lli_alloc() - Allocates a linked list |
|
* |
|
* @pool: pool handle |
|
* @len: length to list |
|
* return: none NULL if success otherwise NULL |
|
*/ |
|
struct coh901318_lli * |
|
coh901318_lli_alloc(struct coh901318_pool *pool, |
|
unsigned int len); |
|
|
|
/** |
|
* coh901318_lli_free() - Returns the linked list items to the pool |
|
* @pool: pool handle |
|
* @lli: reference to lli pointer to be freed |
|
*/ |
|
void coh901318_lli_free(struct coh901318_pool *pool, |
|
struct coh901318_lli **lli); |
|
|
|
/** |
|
* coh901318_lli_fill_memcpy() - Prepares the lli:s for dma memcpy |
|
* @pool: pool handle |
|
* @lli: allocated lli |
|
* @src: src address |
|
* @size: transfer size |
|
* @dst: destination address |
|
* @ctrl_chained: ctrl for chained lli |
|
* @ctrl_last: ctrl for the last lli |
|
* returns number of CPU interrupts for the lli, negative on error. |
|
*/ |
|
int |
|
coh901318_lli_fill_memcpy(struct coh901318_pool *pool, |
|
struct coh901318_lli *lli, |
|
dma_addr_t src, unsigned int size, |
|
dma_addr_t dst, u32 ctrl_chained, u32 ctrl_last); |
|
|
|
/** |
|
* coh901318_lli_fill_single() - Prepares the lli:s for dma single transfer |
|
* @pool: pool handle |
|
* @lli: allocated lli |
|
* @buf: transfer buffer |
|
* @size: transfer size |
|
* @dev_addr: address of periphal |
|
* @ctrl_chained: ctrl for chained lli |
|
* @ctrl_last: ctrl for the last lli |
|
* @dir: direction of transfer (to or from device) |
|
* returns number of CPU interrupts for the lli, negative on error. |
|
*/ |
|
int |
|
coh901318_lli_fill_single(struct coh901318_pool *pool, |
|
struct coh901318_lli *lli, |
|
dma_addr_t buf, unsigned int size, |
|
dma_addr_t dev_addr, u32 ctrl_chained, u32 ctrl_last, |
|
enum dma_transfer_direction dir); |
|
|
|
/** |
|
* coh901318_lli_fill_single() - Prepares the lli:s for dma scatter list transfer |
|
* @pool: pool handle |
|
* @lli: allocated lli |
|
* @sg: scatter gather list |
|
* @nents: number of entries in sg |
|
* @dev_addr: address of periphal |
|
* @ctrl_chained: ctrl for chained lli |
|
* @ctrl: ctrl of middle lli |
|
* @ctrl_last: ctrl for the last lli |
|
* @dir: direction of transfer (to or from device) |
|
* @ctrl_irq_mask: ctrl mask for CPU interrupt |
|
* returns number of CPU interrupts for the lli, negative on error. |
|
*/ |
|
int |
|
coh901318_lli_fill_sg(struct coh901318_pool *pool, |
|
struct coh901318_lli *lli, |
|
struct scatterlist *sg, unsigned int nents, |
|
dma_addr_t dev_addr, u32 ctrl_chained, |
|
u32 ctrl, u32 ctrl_last, |
|
enum dma_transfer_direction dir, u32 ctrl_irq_mask); |
|
|
|
#endif /* COH901318_H */
|
|
|