/* * 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 #include #include #include #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