350 lines
9.3 KiB
C
350 lines
9.3 KiB
C
/*
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* dma.h - Blackfin DMA defines/structures/etc...
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*
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* Copyright 2004-2008 Analog Devices Inc.
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* Licensed under the GPL-2 or later.
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*/
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#ifndef _BLACKFIN_DMA_H_
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#define _BLACKFIN_DMA_H_
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#include <linux/interrupt.h>
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#include <mach/dma.h>
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#include <linux/atomic.h>
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#include <asm/blackfin.h>
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#include <asm/page.h>
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#include <asm-generic/dma.h>
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#include <asm/bfin_dma.h>
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/*-------------------------
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* config reg bits value
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*-------------------------*/
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#define DATA_SIZE_8 0
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#define DATA_SIZE_16 1
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#define DATA_SIZE_32 2
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#ifdef CONFIG_BF60x
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#define DATA_SIZE_64 3
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#endif
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#define DMA_FLOW_STOP 0
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#define DMA_FLOW_AUTO 1
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#ifdef CONFIG_BF60x
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#define DMA_FLOW_LIST 4
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#define DMA_FLOW_ARRAY 5
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#define DMA_FLOW_LIST_DEMAND 6
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#define DMA_FLOW_ARRAY_DEMAND 7
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#else
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#define DMA_FLOW_ARRAY 4
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#define DMA_FLOW_SMALL 6
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#define DMA_FLOW_LARGE 7
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#endif
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#define DIMENSION_LINEAR 0
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#define DIMENSION_2D 1
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#define DIR_READ 0
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#define DIR_WRITE 1
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#define INTR_DISABLE 0
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#ifdef CONFIG_BF60x
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#define INTR_ON_PERI 1
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#endif
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#define INTR_ON_BUF 2
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#define INTR_ON_ROW 3
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#define DMA_NOSYNC_KEEP_DMA_BUF 0
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#define DMA_SYNC_RESTART 1
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#ifdef DMA_MMR_SIZE_32
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#define DMA_MMR_SIZE_TYPE long
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#define DMA_MMR_READ bfin_read32
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#define DMA_MMR_WRITE bfin_write32
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#else
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#define DMA_MMR_SIZE_TYPE short
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#define DMA_MMR_READ bfin_read16
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#define DMA_MMR_WRITE bfin_write16
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#endif
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struct dma_desc_array {
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unsigned long start_addr;
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unsigned DMA_MMR_SIZE_TYPE cfg;
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unsigned DMA_MMR_SIZE_TYPE x_count;
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DMA_MMR_SIZE_TYPE x_modify;
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} __attribute__((packed));
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struct dmasg {
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void *next_desc_addr;
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unsigned long start_addr;
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unsigned DMA_MMR_SIZE_TYPE cfg;
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unsigned DMA_MMR_SIZE_TYPE x_count;
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DMA_MMR_SIZE_TYPE x_modify;
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unsigned DMA_MMR_SIZE_TYPE y_count;
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DMA_MMR_SIZE_TYPE y_modify;
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} __attribute__((packed));
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struct dma_register {
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void *next_desc_ptr; /* DMA Next Descriptor Pointer register */
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unsigned long start_addr; /* DMA Start address register */
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#ifdef CONFIG_BF60x
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unsigned long cfg; /* DMA Configuration register */
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unsigned long x_count; /* DMA x_count register */
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long x_modify; /* DMA x_modify register */
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unsigned long y_count; /* DMA y_count register */
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long y_modify; /* DMA y_modify register */
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unsigned long reserved;
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unsigned long reserved2;
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void *curr_desc_ptr; /* DMA Current Descriptor Pointer
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register */
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void *prev_desc_ptr; /* DMA previous initial Descriptor Pointer
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register */
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unsigned long curr_addr_ptr; /* DMA Current Address Pointer
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register */
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unsigned long irq_status; /* DMA irq status register */
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unsigned long curr_x_count; /* DMA Current x-count register */
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unsigned long curr_y_count; /* DMA Current y-count register */
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unsigned long reserved3;
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unsigned long bw_limit_count; /* DMA band width limit count register */
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unsigned long curr_bw_limit_count; /* DMA Current band width limit
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count register */
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unsigned long bw_monitor_count; /* DMA band width limit count register */
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unsigned long curr_bw_monitor_count; /* DMA Current band width limit
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count register */
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#else
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unsigned short cfg; /* DMA Configuration register */
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unsigned short dummy1; /* DMA Configuration register */
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unsigned long reserved;
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unsigned short x_count; /* DMA x_count register */
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unsigned short dummy2;
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short x_modify; /* DMA x_modify register */
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unsigned short dummy3;
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unsigned short y_count; /* DMA y_count register */
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unsigned short dummy4;
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short y_modify; /* DMA y_modify register */
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unsigned short dummy5;
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void *curr_desc_ptr; /* DMA Current Descriptor Pointer
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register */
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unsigned long curr_addr_ptr; /* DMA Current Address Pointer
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register */
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unsigned short irq_status; /* DMA irq status register */
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unsigned short dummy6;
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unsigned short peripheral_map; /* DMA peripheral map register */
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unsigned short dummy7;
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unsigned short curr_x_count; /* DMA Current x-count register */
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unsigned short dummy8;
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unsigned long reserved2;
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unsigned short curr_y_count; /* DMA Current y-count register */
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unsigned short dummy9;
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unsigned long reserved3;
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#endif
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};
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struct dma_channel {
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const char *device_id;
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atomic_t chan_status;
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volatile struct dma_register *regs;
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struct dmasg *sg; /* large mode descriptor */
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unsigned int irq;
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void *data;
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#ifdef CONFIG_PM
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unsigned short saved_peripheral_map;
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#endif
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};
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#ifdef CONFIG_PM
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int blackfin_dma_suspend(void);
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void blackfin_dma_resume(void);
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#endif
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/*******************************************************************************
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* DMA API's
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*******************************************************************************/
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extern struct dma_channel dma_ch[MAX_DMA_CHANNELS];
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extern struct dma_register * const dma_io_base_addr[MAX_DMA_CHANNELS];
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extern int channel2irq(unsigned int channel);
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static inline void set_dma_start_addr(unsigned int channel, unsigned long addr)
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{
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dma_ch[channel].regs->start_addr = addr;
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}
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static inline void set_dma_next_desc_addr(unsigned int channel, void *addr)
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{
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dma_ch[channel].regs->next_desc_ptr = addr;
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}
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static inline void set_dma_curr_desc_addr(unsigned int channel, void *addr)
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{
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dma_ch[channel].regs->curr_desc_ptr = addr;
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}
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static inline void set_dma_x_count(unsigned int channel, unsigned DMA_MMR_SIZE_TYPE x_count)
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{
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dma_ch[channel].regs->x_count = x_count;
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}
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static inline void set_dma_y_count(unsigned int channel, unsigned DMA_MMR_SIZE_TYPE y_count)
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{
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dma_ch[channel].regs->y_count = y_count;
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}
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static inline void set_dma_x_modify(unsigned int channel, DMA_MMR_SIZE_TYPE x_modify)
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{
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dma_ch[channel].regs->x_modify = x_modify;
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}
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static inline void set_dma_y_modify(unsigned int channel, DMA_MMR_SIZE_TYPE y_modify)
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{
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dma_ch[channel].regs->y_modify = y_modify;
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}
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static inline void set_dma_config(unsigned int channel, unsigned DMA_MMR_SIZE_TYPE config)
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{
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dma_ch[channel].regs->cfg = config;
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}
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static inline void set_dma_curr_addr(unsigned int channel, unsigned long addr)
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{
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dma_ch[channel].regs->curr_addr_ptr = addr;
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}
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#ifdef CONFIG_BF60x
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static inline unsigned long
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set_bfin_dma_config2(char direction, char flow_mode, char intr_mode,
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char dma_mode, char mem_width, char syncmode, char peri_width)
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{
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unsigned long config = 0;
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switch (intr_mode) {
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case INTR_ON_BUF:
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if (dma_mode == DIMENSION_2D)
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config = DI_EN_Y;
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else
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config = DI_EN_X;
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break;
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case INTR_ON_ROW:
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config = DI_EN_X;
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break;
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case INTR_ON_PERI:
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config = DI_EN_P;
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break;
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};
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return config | (direction << 1) | (mem_width << 8) | (dma_mode << 26) |
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(flow_mode << 12) | (syncmode << 2) | (peri_width << 4);
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}
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#endif
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static inline unsigned DMA_MMR_SIZE_TYPE
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set_bfin_dma_config(char direction, char flow_mode,
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char intr_mode, char dma_mode, char mem_width, char syncmode)
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{
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#ifdef CONFIG_BF60x
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return set_bfin_dma_config2(direction, flow_mode, intr_mode, dma_mode,
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mem_width, syncmode, mem_width);
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#else
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return (direction << 1) | (mem_width << 2) | (dma_mode << 4) |
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(intr_mode << 6) | (flow_mode << 12) | (syncmode << 5);
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#endif
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}
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static inline unsigned DMA_MMR_SIZE_TYPE get_dma_curr_irqstat(unsigned int channel)
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{
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return dma_ch[channel].regs->irq_status;
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}
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static inline unsigned DMA_MMR_SIZE_TYPE get_dma_curr_xcount(unsigned int channel)
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{
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return dma_ch[channel].regs->curr_x_count;
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}
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static inline unsigned DMA_MMR_SIZE_TYPE get_dma_curr_ycount(unsigned int channel)
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{
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return dma_ch[channel].regs->curr_y_count;
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}
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static inline void *get_dma_next_desc_ptr(unsigned int channel)
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{
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return dma_ch[channel].regs->next_desc_ptr;
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}
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static inline void *get_dma_curr_desc_ptr(unsigned int channel)
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{
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return dma_ch[channel].regs->curr_desc_ptr;
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}
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static inline unsigned DMA_MMR_SIZE_TYPE get_dma_config(unsigned int channel)
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{
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return dma_ch[channel].regs->cfg;
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}
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static inline unsigned long get_dma_curr_addr(unsigned int channel)
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{
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return dma_ch[channel].regs->curr_addr_ptr;
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}
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static inline void set_dma_sg(unsigned int channel, struct dmasg *sg, int ndsize)
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{
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/* Make sure the internal data buffers in the core are drained
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* so that the DMA descriptors are completely written when the
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* DMA engine goes to fetch them below.
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*/
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SSYNC();
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dma_ch[channel].regs->next_desc_ptr = sg;
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dma_ch[channel].regs->cfg =
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(dma_ch[channel].regs->cfg & ~NDSIZE) |
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((ndsize << NDSIZE_OFFSET) & NDSIZE);
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}
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static inline int dma_channel_active(unsigned int channel)
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{
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return atomic_read(&dma_ch[channel].chan_status);
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}
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static inline void disable_dma(unsigned int channel)
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{
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dma_ch[channel].regs->cfg &= ~DMAEN;
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SSYNC();
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}
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static inline void enable_dma(unsigned int channel)
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{
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dma_ch[channel].regs->curr_x_count = 0;
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dma_ch[channel].regs->curr_y_count = 0;
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dma_ch[channel].regs->cfg |= DMAEN;
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}
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int set_dma_callback(unsigned int channel, irq_handler_t callback, void *data);
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static inline void dma_disable_irq(unsigned int channel)
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{
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disable_irq(dma_ch[channel].irq);
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}
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static inline void dma_disable_irq_nosync(unsigned int channel)
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{
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disable_irq_nosync(dma_ch[channel].irq);
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}
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static inline void dma_enable_irq(unsigned int channel)
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{
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enable_irq(dma_ch[channel].irq);
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}
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static inline void clear_dma_irqstat(unsigned int channel)
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{
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dma_ch[channel].regs->irq_status = DMA_DONE | DMA_ERR | DMA_PIRQ;
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}
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void *dma_memcpy(void *dest, const void *src, size_t count);
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void *dma_memcpy_nocache(void *dest, const void *src, size_t count);
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void *safe_dma_memcpy(void *dest, const void *src, size_t count);
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void blackfin_dma_early_init(void);
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void early_dma_memcpy(void *dest, const void *src, size_t count);
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void early_dma_memcpy_done(void);
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#endif
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