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linux/arch/blackfin/include/asm/dma.h
Michael Hennerich d1401e1dc2 Blackfin: fix DMA/cache bug when resuming from suspend to RAM 
The dma_memcpy() function takes care of flushing different caches for us.
Normally this is what we want, but when resuming from mem, we don't yet
have caches enabled.  If these functions happen to be placed into L1 mem
(which is what we're trying to relocate), then things aren't going to
work.  So define a non-cache dma_memcpy() variant to utilize in situations
like this.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-08-06 12:55:50 -04:00

285 lines
8.3 KiB
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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/atomic.h>
#include <asm/blackfin.h>
#include <asm/page.h>
#include <asm-generic/dma.h>
/* DMA_CONFIG Masks */
#define DMAEN 0x0001 /* DMA Channel Enable */
#define WNR 0x0002 /* Channel Direction (W/R*) */
#define WDSIZE_8 0x0000 /* Transfer Word Size = 8 */
#define WDSIZE_16 0x0004 /* Transfer Word Size = 16 */
#define WDSIZE_32 0x0008 /* Transfer Word Size = 32 */
#define DMA2D 0x0010 /* DMA Mode (2D/1D*) */
#define RESTART 0x0020 /* DMA Buffer Clear */
#define DI_SEL 0x0040 /* Data Interrupt Timing Select */
#define DI_EN 0x0080 /* Data Interrupt Enable */
#define NDSIZE_0 0x0000 /* Next Descriptor Size = 0 (Stop/Autobuffer) */
#define NDSIZE_1 0x0100 /* Next Descriptor Size = 1 */
#define NDSIZE_2 0x0200 /* Next Descriptor Size = 2 */
#define NDSIZE_3 0x0300 /* Next Descriptor Size = 3 */
#define NDSIZE_4 0x0400 /* Next Descriptor Size = 4 */
#define NDSIZE_5 0x0500 /* Next Descriptor Size = 5 */
#define NDSIZE_6 0x0600 /* Next Descriptor Size = 6 */
#define NDSIZE_7 0x0700 /* Next Descriptor Size = 7 */
#define NDSIZE_8 0x0800 /* Next Descriptor Size = 8 */
#define NDSIZE_9 0x0900 /* Next Descriptor Size = 9 */
#define NDSIZE 0x0f00 /* Next Descriptor Size */
#define DMAFLOW 0x7000 /* Flow Control */
#define DMAFLOW_STOP 0x0000 /* Stop Mode */
#define DMAFLOW_AUTO 0x1000 /* Autobuffer Mode */
#define DMAFLOW_ARRAY 0x4000 /* Descriptor Array Mode */
#define DMAFLOW_SMALL 0x6000 /* Small Model Descriptor List Mode */
#define DMAFLOW_LARGE 0x7000 /* Large Model Descriptor List Mode */
/* DMA_IRQ_STATUS Masks */
#define DMA_DONE 0x0001 /* DMA Completion Interrupt Status */
#define DMA_ERR 0x0002 /* DMA Error Interrupt Status */
#define DFETCH 0x0004 /* DMA Descriptor Fetch Indicator */
#define DMA_RUN 0x0008 /* DMA Channel Running Indicator */
/*-------------------------
* 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 dma_channel {
const char *device_id;
atomic_t 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)
{
return atomic_read(&dma_ch[channel].chan_status);
}
static inline void disable_dma(unsigned int channel)
{
dma_ch[channel].regs->cfg &= ~DMAEN;
SSYNC();
}
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;
}
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_disable_irq_nosync(unsigned int channel)
{
disable_irq_nosync(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 *dma_memcpy_nocache(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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