8a26ac7043
This API is necessary for DMA descriptor array mode. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
191 lines
5.9 KiB
C
191 lines
5.9 KiB
C
/*
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* File: include/asm-blackfin/simple_bf533_dma.h
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* Based on: none - original work
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* Author: LG Soft India
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* Copyright (C) 2004-2005 Analog Devices Inc.
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* Created: Tue Sep 21 2004
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* Description: This file contains the major Data structures and constants
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* used for DMA Implementation in BF533
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* Modified:
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING.
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* If not, write to the Free Software Foundation,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef _BLACKFIN_DMA_H_
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#define _BLACKFIN_DMA_H_
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#include <asm/io.h>
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#include <linux/slab.h>
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#include <asm/irq.h>
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#include <asm/signal.h>
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#include <asm/semaphore.h>
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#include <linux/kernel.h>
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#include <asm/mach/dma.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <asm/blackfin.h>
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#define MAX_DMA_ADDRESS PAGE_OFFSET
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/*****************************************************************************
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* Generic DMA Declarations
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*
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****************************************************************************/
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enum dma_chan_status {
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DMA_CHANNEL_FREE,
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DMA_CHANNEL_REQUESTED,
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DMA_CHANNEL_ENABLED,
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};
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/*-------------------------
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* config reg bits value
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*-------------------------*/
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#define DATA_SIZE_8 0
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#define DATA_SIZE_16 1
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#define DATA_SIZE_32 2
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#define DMA_FLOW_STOP 0
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#define DMA_FLOW_AUTO 1
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#define DMA_FLOW_ARRAY 4
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#define DMA_FLOW_SMALL 6
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#define DMA_FLOW_LARGE 7
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#define DIMENSION_LINEAR 0
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#define DIMENSION_2D 1
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#define DIR_READ 0
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#define DIR_WRITE 1
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#define INTR_DISABLE 0
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#define INTR_ON_BUF 2
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#define INTR_ON_ROW 3
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struct dmasg {
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unsigned long next_desc_addr;
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unsigned long start_addr;
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unsigned short cfg;
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unsigned short x_count;
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short x_modify;
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unsigned short y_count;
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short y_modify;
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} __attribute__((packed));
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struct dma_register {
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unsigned long next_desc_ptr; /* DMA Next Descriptor Pointer register */
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unsigned long start_addr; /* DMA Start address register */
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unsigned short cfg; /* DMA Configuration register */
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unsigned short dummy1; /* DMA Configuration register */
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unsigned long reserved;
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unsigned short x_count; /* DMA x_count register */
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unsigned short dummy2;
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short x_modify; /* DMA x_modify register */
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unsigned short dummy3;
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unsigned short y_count; /* DMA y_count register */
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unsigned short dummy4;
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short y_modify; /* DMA y_modify register */
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unsigned short dummy5;
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unsigned long curr_desc_ptr; /* DMA Current Descriptor Pointer
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register */
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unsigned short curr_addr_ptr_lo; /* DMA Current Address Pointer
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register */
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unsigned short curr_addr_ptr_hi; /* DMA Current Address Pointer
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register */
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unsigned short irq_status; /* DMA irq status register */
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unsigned short dummy6;
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unsigned short peripheral_map; /* DMA peripheral map register */
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unsigned short dummy7;
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unsigned short curr_x_count; /* DMA Current x-count register */
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unsigned short dummy8;
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unsigned long reserved2;
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unsigned short curr_y_count; /* DMA Current y-count register */
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unsigned short dummy9;
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unsigned long reserved3;
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};
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typedef irqreturn_t(*dma_interrupt_t) (int irq, void *dev_id);
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struct dma_channel {
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struct mutex dmalock;
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char *device_id;
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enum dma_chan_status chan_status;
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struct dma_register *regs;
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struct dmasg *sg; /* large mode descriptor */
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unsigned int ctrl_num; /* controller number */
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dma_interrupt_t irq_callback;
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void *data;
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unsigned int dma_enable_flag;
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unsigned int loopback_flag;
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};
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/*******************************************************************************
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* DMA API's
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*******************************************************************************/
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/* functions to set register mode */
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void set_dma_start_addr(unsigned int channel, unsigned long addr);
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void set_dma_next_desc_addr(unsigned int channel, unsigned long addr);
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void set_dma_curr_desc_addr(unsigned int channel, unsigned long addr);
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void set_dma_x_count(unsigned int channel, unsigned short x_count);
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void set_dma_x_modify(unsigned int channel, short x_modify);
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void set_dma_y_count(unsigned int channel, unsigned short y_count);
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void set_dma_y_modify(unsigned int channel, short y_modify);
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void set_dma_config(unsigned int channel, unsigned short config);
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unsigned short set_bfin_dma_config(char direction, char flow_mode,
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char intr_mode, char dma_mode, char width);
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void set_dma_curr_addr(unsigned int channel, unsigned long addr);
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/* get curr status for polling */
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unsigned short get_dma_curr_irqstat(unsigned int channel);
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unsigned short get_dma_curr_xcount(unsigned int channel);
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unsigned short get_dma_curr_ycount(unsigned int channel);
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/* set large DMA mode descriptor */
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void set_dma_sg(unsigned int channel, struct dmasg *sg, int nr_sg);
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/* check if current channel is in use */
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int dma_channel_active(unsigned int channel);
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/* common functions must be called in any mode */
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void free_dma(unsigned int channel);
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int dma_channel_active(unsigned int channel); /* check if a channel is in use */
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void disable_dma(unsigned int channel);
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void enable_dma(unsigned int channel);
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int request_dma(unsigned int channel, char *device_id);
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int set_dma_callback(unsigned int channel, dma_interrupt_t callback,
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void *data);
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void dma_disable_irq(unsigned int channel);
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void dma_enable_irq(unsigned int channel);
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void clear_dma_irqstat(unsigned int channel);
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void *dma_memcpy(void *dest, const void *src, size_t count);
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void *safe_dma_memcpy(void *dest, const void *src, size_t count);
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#endif
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