diff options
Diffstat (limited to 'arch/blackfin/include/asm/dma.h')
| -rw-r--r-- | arch/blackfin/include/asm/dma.h | 220 |
1 files changed, 136 insertions, 84 deletions
diff --git a/arch/blackfin/include/asm/dma.h b/arch/blackfin/include/asm/dma.h index 6509733bb0f6..e4f7b8043f02 100644 --- a/arch/blackfin/include/asm/dma.h +++ b/arch/blackfin/include/asm/dma.h @@ -1,44 +1,17 @@ /* - * 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: + * dma.h - Blackfin DMA defines/structures/etc... * - * 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. + * Copyright 2004-2008 Analog Devices Inc. + * Licensed under the GPL-2 or later. */ #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 <linux/kernel.h> -#include <mach/dma.h> -#include <linux/mm.h> #include <linux/interrupt.h> +#include <mach/dma.h> #include <asm/blackfin.h> +#include <asm/page.h> #define MAX_DMA_ADDRESS PAGE_OFFSET @@ -79,7 +52,7 @@ enum dma_chan_status { #define DMA_SYNC_RESTART 1 struct dmasg { - unsigned long next_desc_addr; + void *next_desc_addr; unsigned long start_addr; unsigned short cfg; unsigned short x_count; @@ -89,7 +62,7 @@ struct dmasg { } __attribute__((packed)); struct dma_register { - unsigned long next_desc_ptr; /* DMA Next Descriptor Pointer register */ + void *next_desc_ptr; /* DMA Next Descriptor Pointer register */ unsigned long start_addr; /* DMA Start address register */ unsigned short cfg; /* DMA Configuration register */ @@ -109,7 +82,7 @@ struct dma_register { short y_modify; /* DMA y_modify register */ unsigned short dummy5; - unsigned long curr_desc_ptr; /* DMA Current Descriptor Pointer + void *curr_desc_ptr; /* DMA Current Descriptor Pointer register */ unsigned long curr_addr_ptr; /* DMA Current Address Pointer register */ @@ -131,19 +104,15 @@ struct dma_register { }; -typedef irqreturn_t(*dma_interrupt_t) (int irq, void *dev_id); - +struct mutex; struct dma_channel { struct mutex dmalock; - char *device_id; + const char *device_id; enum dma_chan_status chan_status; - struct dma_register *regs; + volatile struct dma_register *regs; struct dmasg *sg; /* large mode descriptor */ - unsigned int ctrl_num; /* controller number */ - dma_interrupt_t irq_callback; + unsigned int irq; void *data; - unsigned int dma_enable_flag; - unsigned int loopback_flag; #ifdef CONFIG_PM unsigned short saved_peripheral_map; #endif @@ -157,49 +126,132 @@ void blackfin_dma_resume(void); /******************************************************************************* * 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_curr_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, - char syncmode); -void set_dma_curr_addr(unsigned int channel, unsigned long addr); - -/* 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); -unsigned long get_dma_next_desc_ptr(unsigned int channel); -unsigned long get_dma_curr_desc_ptr(unsigned int channel); -unsigned long get_dma_curr_addr(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 */ +extern struct dma_channel dma_ch[MAX_DMA_CHANNELS]; +extern struct dma_register *dma_io_base_addr[MAX_DMA_CHANNELS]; +extern int channel2irq(unsigned int channel); + +static inline void set_dma_start_addr(unsigned int channel, unsigned long addr) +{ + dma_ch[channel].regs->start_addr = addr; +} +static inline void set_dma_next_desc_addr(unsigned int channel, void *addr) +{ + dma_ch[channel].regs->next_desc_ptr = addr; +} +static inline void set_dma_curr_desc_addr(unsigned int channel, void *addr) +{ + dma_ch[channel].regs->curr_desc_ptr = addr; +} +static inline void set_dma_x_count(unsigned int channel, unsigned short x_count) +{ + dma_ch[channel].regs->x_count = x_count; +} +static inline void set_dma_y_count(unsigned int channel, unsigned short y_count) +{ + dma_ch[channel].regs->y_count = y_count; +} +static inline void set_dma_x_modify(unsigned int channel, short x_modify) +{ + dma_ch[channel].regs->x_modify = x_modify; +} +static inline void set_dma_y_modify(unsigned int channel, short y_modify) +{ + dma_ch[channel].regs->y_modify = y_modify; +} +static inline void set_dma_config(unsigned int channel, unsigned short config) +{ + dma_ch[channel].regs->cfg = config; +} +static inline void set_dma_curr_addr(unsigned int channel, unsigned long addr) +{ + dma_ch[channel].regs->curr_addr_ptr = addr; +} + +static inline unsigned short +set_bfin_dma_config(char direction, char flow_mode, + char intr_mode, char dma_mode, char width, char syncmode) +{ + return (direction << 1) | (width << 2) | (dma_mode << 4) | + (intr_mode << 6) | (flow_mode << 12) | (syncmode << 5); +} + +static inline unsigned short get_dma_curr_irqstat(unsigned int channel) +{ + return dma_ch[channel].regs->irq_status; +} +static inline unsigned short get_dma_curr_xcount(unsigned int channel) +{ + return dma_ch[channel].regs->curr_x_count; +} +static inline unsigned short get_dma_curr_ycount(unsigned int channel) +{ + return dma_ch[channel].regs->curr_y_count; +} +static inline void *get_dma_next_desc_ptr(unsigned int channel) +{ + return dma_ch[channel].regs->next_desc_ptr; +} +static inline void *get_dma_curr_desc_ptr(unsigned int channel) +{ + return dma_ch[channel].regs->curr_desc_ptr; +} +static inline unsigned short get_dma_config(unsigned int channel) +{ + return dma_ch[channel].regs->cfg; +} +static inline unsigned long get_dma_curr_addr(unsigned int channel) +{ + return dma_ch[channel].regs->curr_addr_ptr; +} + +static inline void set_dma_sg(unsigned int channel, struct dmasg *sg, int ndsize) +{ + dma_ch[channel].regs->cfg = + (dma_ch[channel].regs->cfg & ~(0xf << 8)) | + ((ndsize & 0xf) << 8); + dma_ch[channel].regs->next_desc_ptr = sg; +} + +static inline int dma_channel_active(unsigned int channel) +{ + if (dma_ch[channel].chan_status == DMA_CHANNEL_FREE) + return 0; + else + return 1; +} + +static inline void disable_dma(unsigned int channel) +{ + dma_ch[channel].regs->cfg &= ~DMAEN; + SSYNC(); + dma_ch[channel].chan_status = DMA_CHANNEL_REQUESTED; +} +static inline void enable_dma(unsigned int channel) +{ + dma_ch[channel].regs->curr_x_count = 0; + dma_ch[channel].regs->curr_y_count = 0; + dma_ch[channel].regs->cfg |= DMAEN; + dma_ch[channel].chan_status = DMA_CHANNEL_ENABLED; +} 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); +int request_dma(unsigned int channel, const char *device_id); +int set_dma_callback(unsigned int channel, irq_handler_t callback, void *data); + +static inline void dma_disable_irq(unsigned int channel) +{ + disable_irq(dma_ch[channel].irq); +} +static inline void dma_enable_irq(unsigned int channel) +{ + enable_irq(dma_ch[channel].irq); +} +static inline void clear_dma_irqstat(unsigned int channel) +{ + dma_ch[channel].regs->irq_status = DMA_DONE | DMA_ERR; +} + void *dma_memcpy(void *dest, const void *src, size_t count); void *safe_dma_memcpy(void *dest, const void *src, size_t count); - -extern int channel2irq(unsigned int channel); -extern struct dma_register *dma_io_base_addr[MAX_BLACKFIN_DMA_CHANNEL]; +void blackfin_dma_early_init(void); #endif |