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Diffstat (limited to 'arch/blackfin/include/asm/dma.h')
| -rw-r--r-- | arch/blackfin/include/asm/dma.h | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/dma.h b/arch/blackfin/include/asm/dma.h new file mode 100644 index 00000000..dac0c972 --- /dev/null +++ b/arch/blackfin/include/asm/dma.h @@ -0,0 +1,252 @@ +/* + * 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 <linux/atomic.h> +#include <asm/blackfin.h> +#include <asm/page.h> +#include <asm-generic/dma.h> +#include <asm/bfin_dma.h> + +/*------------------------- + * 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 * const 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 |