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/*
* lpss_dma.h - Intel LPSS DMA Header File
*
* Copyright (C) 2014, Intel Corporation
*
* 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.
*
* This driver supports the following platform
* Baytrail, Cherrytrail, Broxton
*/
#ifndef LPSS_DMA_H_
#define LPSS_DMA_H_
/* DMA Burst size */
enum lpss_dma_msize {
LPSS_DMA_MSIZE_1 = 0x0,
LPSS_DMA_MSIZE_4 = 0x1,
LPSS_DMA_MSIZE_8 = 0x2,
LPSS_DMA_MSIZE_16 = 0x3,
};
/* DMA transfer width */
enum lpss_dma_buswidth {
LPSS_DMA_BUSWIDTH_1_BYTE = 0x0,
LPSS_DMA_BUSWIDTH_2_BYTES = 0x1,
LPSS_DMA_BUSWIDTH_4_BYTES = 0x2,
};
#define DMA_NAME_SIZE 32
#define LPSS_DMA_V1 1 /* for BYT and CHT platform */
#define LPSS_DMA_V2 0 /* for BXT platform */
typedef void (*lpss_dma_tx_callback)(void *lpss_lpss_dmaaram);
/* LPSS DMA platform info */
struct lpss_dma_info {
struct device *pdev;
void __iomem *membase;
unsigned int irq;
int dma_version;
int ch_base;
char name[DMA_NAME_SIZE];
dma_addr_t per_tx_addr;
dma_addr_t per_rx_addr;
enum lpss_dma_buswidth dma_buswidth;
enum lpss_dma_msize dma_burstsize;
lpss_dma_tx_callback tx_callback;
lpss_dma_tx_callback rx_callback;
void *callback_param;
struct completion *tx_comp;
struct completion *rx_comp;
};
/* --- LPSS DMA API --- */
void *lpss_dma_register(struct lpss_dma_info *info);
void lpss_dma_unregister(void *lpss_dma);
void *lpss_dma_alloc(size_t len);
void lpss_dma_free(void *addr);
int lpss_dma_start_tx(void *lpss_dma, void *src, size_t len);
int lpss_dma_stop_tx(void *lpss_dma);
size_t lpss_dma_get_tx_count(void *lpss_dma);
int lpss_dma_start_rx(void *lpss_dma, void *dest, size_t len);
int lpss_dma_stop_rx(void *lpss_dma);
size_t lpss_dma_get_rx_count(void *lpss_dma);
int lpss_dma_set_buswidth(void *lpss_dma, enum lpss_dma_buswidth);
int lpss_dma_set_burstsize(void *lpss_dma, enum lpss_dma_msize);
void lpss_dma_resume(void *lpss_dma);
void lpss_dma_suspend(void *lpss_dma);
/* dma channel user type, for byt and cht platform */
enum {
lpss_hsu_dma,
lpss_spi_dma,
lpss_i2c_dma,
};
#ifdef CONFIG_BYT_LPSS_DMA
int lpss_get_controller_info(int dma_type, int index, struct lpss_dma_info *dma_info);
#else
static inline int lpss_get_controller_info(int dma_type, int index, struct lpss_dma_info *dma_info)
{
return 0;
}
#endif
#endif
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