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/*
* mvf_edma.h - mvf eDMA driver header file.
*
* Copyright 2008-2012 Freescale Semiconductor, Inc. All Rights Reserved.
*
* Add support for mvf platform (Lanttor.Guo@freescale.com)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#ifndef _MCF_EDMA_H
#define _MCF_EDMA_H
#include <linux/interrupt.h>
#include <asm/mvf_edma_regs.h>
#include <linux/scatterlist.h>
#define DMA_MODE_READ 0
#define DMA_MODE_WRITE 1
#define DMA_MODE_MASK 1
#define MCF_EDMA_INT0_CHANNEL_BASE (8)
#define MCF_EDMA_INT0_CONTROLLER_BASE (64)
#define MCF_EDMA_INT0_BASE (MCF_EDMA_INT0_CHANNEL_BASE + MCF_EDMA_INT0_CONTROLLER_BASE)
#define MCF_EDMA_INT0_NUM (16)
#define MCF_EDMA_INT0_END (MCF_EDMA_INT0_NUM)
#define MCF_EDMA_INT1_CHANNEL_BASE (8)
#define MCF_EDMA_INT1_CONTROLLER_BASE (128)
#define MCF_EDMA_INT1_BASE (MCF_EDMA_INT1_CHANNEL_BASE + MCF_EDMA_INT1_CONTROLLER_BASE)
#define MCF_EDMA_INT1_NUM (40)
#define MCF_EDMA_INT1_END (MCF_EDMA_INT0_END + MCF_EDMA_INT1_NUM)
#define MCF_EDMA_INT2_CHANNEL_BASE (0)
#define MCF_EDMA_INT2_CONTROLLER_BASE (192)
#define MCF_EDMA_INT2_BASE (MCF_EDMA_INT2_CHANNEL_BASE + MCF_EDMA_INT2_CONTROLLER_BASE)
#define MCF_EDMA_INT2_NUM (8)
#define MCF_EDMA_INT2_END (MCF_EDMA_INT1_END + MCF_EDMA_INT2_NUM)
#define MCF_EDMA_CHANNEL_ANY (0xFF)
#define MCF_EDMA_INT_ERR (16) /* edma error interrupt */
#define MCF_EDMA_TCD_PER_CHAN 256
#define MVF_EACH_DMA_CHANNEL 32
/* Setup transfer control descriptor (TCD)
* channel - descriptor number
* source - source address
* dest - destination address
* attr - attributes
* soff - source offset
* nbytes - number of bytes to be transfered in minor loop
* slast - last source address adjustment
* citer - major loop count
* biter - begining minor loop count
* doff - destination offset
* dlast_sga - last destination address adjustment
* major_int - generate interrupt after each major loop
* disable_req - disable DMA request after major loop
*/
#if 0
void mvf_edma_set_tcd_params(int channel, u32 source, u32 dest,
u32 attr, u32 soff, u32 nbytes, u32 slast,
u32 citer, u32 biter, u32 doff, u32 dlast_sga,
int major_int, int disable_req);
#endif
/* Setup transfer control descriptor (TCD) and enable halfway irq
* channel - descriptor number
* source - source address
* dest - destination address
* attr - attributes
* soff - source offset
* nbytes - number of bytes to be transfered in minor loop
* slast - last source address adjustment
* biter - major loop count
* doff - destination offset
* dlast_sga - last destination address adjustment
* disable_req - disable DMA request after major loop
*/
void mvf_edma_set_tcd_params_halfirq(int channel, u32 source, u32 dest,
u32 attr, u32 soff, u32 nbytes, u32 slast,
u32 biter, u32 doff, u32 dlast_sga,
int disable_req);
/* check if dma is done
* channel - descriptor number
* return 1 if done
*/
int mvf_edma_check_done(int channel);
#if 0
/* Starts eDMA transfer on specified channel
* channel - eDMA TCD number
*/
static inline void
mvf_edma_start_transfer(int channel)
{
MCF_EDMA_SERQ = channel;
MCF_EDMA_SSRT = channel;
}
/* Restart eDMA transfer from halfirq
* channel - eDMA TCD number
*/
static inline void
mvf_edma_confirm_halfirq(int channel)
{
/*MCF_EDMA_TCD_CSR(channel) = 7;*/
MCF_EDMA_SSRT = channel;
}
/* Starts eDMA transfer on specified channel based on peripheral request
* channel - eDMA TCD number
*/
static inline void mvf_edma_enable_transfer(int channel)
{
MCF_EDMA_SERQ = channel;
}
/* Stops eDMA transfer
* channel - eDMA TCD number
*/
static inline void
mvf_edma_stop_transfer(int channel)
{
MCF_EDMA_CINT = channel;
MCF_EDMA_CERQ = channel;
}
/* Confirm that interrupt has been handled
* channel - eDMA TCD number
*/
static inline void
mvf_edma_confirm_interrupt_handled(int channel)
{
MCF_EDMA_CINT = channel;
}
#endif
/**
* mvf_edma_request_channel - Request an eDMA channel
* @channel: channel number. In case it is equal to EDMA_CHANNEL_ANY
* it will be allocated a first free eDMA channel.
* @handler: dma handler
* @error_handler: dma error handler
* @irq_level: irq level for the dma handler
* @arg: argument to pass back
* @lock: optional spinlock to hold over interrupt
* @device_id: device id
*
* Returns allocatedd channel number if success or
* a negative value if failure.
*/
int mvf_edma_request_channel(int channel,
irqreturn_t(*handler) (int, void *),
void (*error_handler) (int, void *),
u8 irq_level,
void *arg,
spinlock_t *lock, const char *device_id);
/**
* Update the channel callback/arg
* @channel: channel number
* @handler: dma handler
* @error_handler: dma error handler
* @arg: argument to pass back
*
* Returns 0 if success or a negative value if failure
*/
int mvf_edma_set_callback(int channel,
irqreturn_t(*handler) (int, void *),
void (*error_handler) (int, void *), void *arg);
/**
* Free the edma channel
* @channel: channel number
* @arg: argument created with
*
* Returns 0 if success or a negative value if failure
*/
int mvf_edma_free_channel(int channel, void *arg);
void mvf_edma_dump_channel(int channel);
#endif /* _MCF_EDMA_H */
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