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linux/arch/blackfin/include/asm/dma.h
Sonic Zhang ea8538a039 Blackfin: add SSYNC to set_dma_sg() for descriptor fetching 
Make sure the internal core buffers are flushed before telling the DMA
engine to fetch the descriptor structure so that it gets the right values.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-06-12 06:11:57 -04:00

266 lines
7.0 KiB
C
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/*
* dma.h - Blackfin DMA defines/structures/etc...
*
* Copyright 2004-2008 Analog Devices Inc.
* Licensed under the GPL-2 or later.
*/
#ifndef _BLACKFIN_DMA_H_
#define _BLACKFIN_DMA_H_
#include <linux/interrupt.h>
#include <mach/dma.h>
#include <asm/blackfin.h>
#include <asm/page.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
#define DMA_NOSYNC_KEEP_DMA_BUF 0
#define DMA_SYNC_RESTART 1
struct dmasg {
void *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 {
void *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;
void *curr_desc_ptr; /* DMA Current Descriptor Pointer
register */
unsigned long curr_addr_ptr; /* 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;
};
struct mutex;
struct dma_channel {
struct mutex dmalock;
const char *device_id;
enum dma_chan_status chan_status;
volatile struct dma_register *regs;
struct dmasg *sg; /* large mode descriptor */
unsigned int irq;
void *data;
#ifdef CONFIG_PM
unsigned short saved_peripheral_map;
#endif
};
#ifdef CONFIG_PM
int blackfin_dma_suspend(void);
void blackfin_dma_resume(void);
#endif
/*******************************************************************************
* DMA API's
*******************************************************************************/
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)
{
/* Make sure the internal data buffers in the core are drained
* so that the DMA descriptors are completely written when the
* DMA engine goes to fetch them below.
*/
SSYNC();
dma_ch[channel].regs->next_desc_ptr = sg;
dma_ch[channel].regs->cfg =
(dma_ch[channel].regs->cfg & ~(0xf << 8)) |
((ndsize & 0xf) << 8);
}
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 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);
void blackfin_dma_early_init(void);
void early_dma_memcpy(void *dest, const void *src, size_t count);
void early_dma_memcpy_done(void);
#endif
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