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Diffstat (limited to 'include/asm-blackfin/dma.h')
| -rw-r--r-- | include/asm-blackfin/dma.h | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/include/asm-blackfin/dma.h b/include/asm-blackfin/dma.h new file mode 100644 index 00000000000..be0d913e551 --- /dev/null +++ b/include/asm-blackfin/dma.h @@ -0,0 +1,188 @@ +/* + * File: include/asm-blackfin/simple_bf533_dma.h + * Based on: none - original work + * Author: LG Soft India + * Copyright (C) 2004-2005 Analog Devices Inc. + * Created: Tue Sep 21 2004 + * Description: This file contains the major Data structures and constants + * used for DMA Implementation in BF533 + * Modified: + * + * Bugs: Enter bugs at http://blackfin.uclinux.org/ + * + * 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, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; see the file COPYING. + * If not, write to the Free Software Foundation, + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#ifndef _BLACKFIN_DMA_H_ +#define _BLACKFIN_DMA_H_ + +#include <asm/io.h> +#include <linux/slab.h> +#include <asm/irq.h> +#include <asm/signal.h> +#include <asm/semaphore.h> + +#include <linux/kernel.h> +#include <asm/mach/dma.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <asm/blackfin.h> + +#define MAX_DMA_ADDRESS PAGE_OFFSET + +/***************************************************************************** +* Generic DMA Declarations +* +****************************************************************************/ +enum dma_chan_status { + DMA_CHANNEL_FREE, + DMA_CHANNEL_REQUESTED, + DMA_CHANNEL_ENABLED, +}; + +/*------------------------- + * config reg bits value + *-------------------------*/ +#define DATA_SIZE_8 0 +#define DATA_SIZE_16 1 +#define DATA_SIZE_32 2 + +#define DMA_FLOW_STOP 0 +#define DMA_FLOW_AUTO 1 +#define DMA_FLOW_ARRAY 4 +#define DMA_FLOW_SMALL 6 +#define DMA_FLOW_LARGE 7 + +#define DIMENSION_LINEAR 0 +#define DIMENSION_2D 1 + +#define DIR_READ 0 +#define DIR_WRITE 1 + +#define INTR_DISABLE 0 +#define INTR_ON_BUF 2 +#define INTR_ON_ROW 3 + +struct dmasg { + unsigned long next_desc_addr; + unsigned long start_addr; + unsigned short cfg; + unsigned short x_count; + short x_modify; + unsigned short y_count; + short y_modify; +} __attribute__((packed)); + +struct dma_register { + unsigned long next_desc_ptr; /* DMA Next Descriptor Pointer register */ + unsigned long start_addr; /* DMA Start address register */ + + unsigned short cfg; /* DMA Configuration register */ + unsigned short dummy1; /* DMA Configuration register */ + + unsigned long reserved; + + unsigned short x_count; /* DMA x_count register */ + unsigned short dummy2; + + short x_modify; /* DMA x_modify register */ + unsigned short dummy3; + + unsigned short y_count; /* DMA y_count register */ + unsigned short dummy4; + + short y_modify; /* DMA y_modify register */ + unsigned short dummy5; + + unsigned long curr_desc_ptr; /* DMA Current Descriptor Pointer + register */ + unsigned short curr_addr_ptr_lo; /* DMA Current Address Pointer + register */ + unsigned short curr_addr_ptr_hi; /* DMA Current Address Pointer + register */ + unsigned short irq_status; /* DMA irq status register */ + unsigned short dummy6; + + unsigned short peripheral_map; /* DMA peripheral map register */ + unsigned short dummy7; + + unsigned short curr_x_count; /* DMA Current x-count register */ + unsigned short dummy8; + + unsigned long reserved2; + + unsigned short curr_y_count; /* DMA Current y-count register */ + unsigned short dummy9; + + unsigned long reserved3; + +}; + +typedef irqreturn_t(*dma_interrupt_t) (int irq, void *dev_id); + +struct dma_channel { + struct mutex dmalock; + char *device_id; + enum dma_chan_status chan_status; + struct dma_register *regs; + struct dmasg *sg; /* large mode descriptor */ + unsigned int ctrl_num; /* controller number */ + dma_interrupt_t irq_callback; + void *data; + unsigned int dma_enable_flag; + unsigned int loopback_flag; +}; + +/******************************************************************************* +* DMA API's +*******************************************************************************/ +/* functions to set register mode */ +void set_dma_start_addr(unsigned int channel, unsigned long addr); +void set_dma_next_desc_addr(unsigned int channel, unsigned long addr); +void set_dma_x_count(unsigned int channel, unsigned short x_count); +void set_dma_x_modify(unsigned int channel, short x_modify); +void set_dma_y_count(unsigned int channel, unsigned short y_count); +void set_dma_y_modify(unsigned int channel, short y_modify); +void set_dma_config(unsigned int channel, unsigned short config); +unsigned short set_bfin_dma_config(char direction, char flow_mode, + char intr_mode, char dma_mode, char width); + +/* get curr status for polling */ +unsigned short get_dma_curr_irqstat(unsigned int channel); +unsigned short get_dma_curr_xcount(unsigned int channel); +unsigned short get_dma_curr_ycount(unsigned int channel); + +/* set large DMA mode descriptor */ +void set_dma_sg(unsigned int channel, struct dmasg *sg, int nr_sg); + +/* check if current channel is in use */ +int dma_channel_active(unsigned int channel); + +/* common functions must be called in any mode */ +void free_dma(unsigned int channel); +int dma_channel_active(unsigned int channel); /* check if a channel is in use */ +void disable_dma(unsigned int channel); +void enable_dma(unsigned int channel); +int request_dma(unsigned int channel, char *device_id); +int set_dma_callback(unsigned int channel, dma_interrupt_t callback, + void *data); +void dma_disable_irq(unsigned int channel); +void dma_enable_irq(unsigned int channel); +void clear_dma_irqstat(unsigned int channel); +void *dma_memcpy(void *dest, const void *src, size_t count); +void *safe_dma_memcpy(void *dest, const void *src, size_t count); + +#endif |