ppc4xx_dma.h

linux 内核源代码

#define SET_DMA_PRIORITY(x)   (((x)&0x00800001))	/* DMA Channel Priority */
#define DMA_PRIORITY_MASK	0x00800001
#define   PRIORITY_LOW         	0x00000000
#define   PRIORITY_MID_LOW     	0x00000001
#define   PRIORITY_MID_HIGH    	0x00800000
#define   PRIORITY_HIGH        	0x00800001
#define GET_DMA_PRIORITY(x) (((((x)&DMA_PRIORITY_MASK) &0x00800000) >> 22 ) | (((x)&DMA_PRIORITY_MASK) &0x00000001))

#define DMA_CS0           (1<<31)	/* Terminal Count has been reached */
#define DMA_CS1           (1<<30)
#define DMA_CS2           (1<<29)
#define DMA_CS3           (1<<28)

#define DMA_TS0           (1<<27)	/* End of Transfer has been requested */
#define DMA_TS1           (1<<26)
#define DMA_TS2           (1<<25)
#define DMA_TS3           (1<<24)

#define DMA_CH0_ERR       (1<<23)	/* DMA Chanel 0 Error */
#define DMA_CH1_ERR       (1<<22)
#define DMA_CH2_ERR       (1<<21)
#define DMA_CH3_ERR       (1<<20)

#define DMA_CT0		  (1<<19)	/* Chained transfere */

#define DMA_IN_DMA_REQ0   (1<<18)	/* Internal DMA Request is pending */
#define DMA_IN_DMA_REQ1   (1<<17)
#define DMA_IN_DMA_REQ2   (1<<16)
#define DMA_IN_DMA_REQ3   (1<<15)

#define DMA_EXT_DMA_REQ0  (1<<14)	/* External DMA Request is pending */
#define DMA_EXT_DMA_REQ1  (1<<13)
#define DMA_EXT_DMA_REQ2  (1<<12)
#define DMA_EXT_DMA_REQ3  (1<<11)

#define DMA_CH0_BUSY      (1<<10)	/* DMA Channel 0 Busy */
#define DMA_CH1_BUSY      (1<<9)
#define DMA_CH2_BUSY       (1<<8)
#define DMA_CH3_BUSY       (1<<7)

#define DMA_CT1            (1<<6)	/* Chained transfere */
#define DMA_CT2            (1<<5)
#define DMA_CT3            (1<<4)

#define DMA_CH_ENABLE (1<<7)
#define SET_DMA_CH(x) (((x)&0x1)<<7)
#define GET_DMA_CH(x) (((x)&DMA_CH_ENABLE)>>7)

/* STBx25xxx dma unique */
/* enable device port on a dma channel
 * example ext 0 on dma 1
 */

#define	SSP0_RECV	15
#define	SSP0_XMIT	14
#define EXT_DMA_0	12
#define	SC1_XMIT	11
#define SC1_RECV	10
#define EXT_DMA_2	9
#define	EXT_DMA_3	8
#define SERIAL2_XMIT	7
#define SERIAL2_RECV	6
#define SC0_XMIT 	5
#define	SC0_RECV	4
#define	SERIAL1_XMIT	3
#define SERIAL1_RECV	2
#define	SERIAL0_XMIT	1
#define SERIAL0_RECV	0

#define DMA_CHAN_0	1
#define DMA_CHAN_1	2
#define DMA_CHAN_2	3
#define DMA_CHAN_3	4

/* end STBx25xx */

/*
 * Bit 30 must be one for Redwoods, otherwise transfers may receive errors.
 */
#define DMA_CR_MB0 0x2

#define SET_DMA_CONTROL \
       		(SET_DMA_CIE_ENABLE(p_init->int_enable) |  /* interrupt enable         */ \
		SET_DMA_ETD(p_init->etd_output)        |  /* end of transfer pin      */ \
		SET_DMA_TCE(p_init->tce_enable)        |  /* terminal count enable    */ \
		SET_DMA_PL(p_init->pl)                 |  /* peripheral location      */ \
		SET_DMA_DAI(p_init->dai)               |  /* dest addr increment      */ \
		SET_DMA_SAI(p_init->sai)               |  /* src addr increment       */ \
		SET_DMA_PRIORITY(p_init->cp)           |  /* channel priority        */  \
		SET_DMA_PW(p_init->pwidth)             |  /* peripheral/bus width    */ \
		SET_DMA_PSC(p_init->psc)               |  /* peripheral setup cycles */ \
		SET_DMA_PWC(p_init->pwc)               |  /* peripheral wait cycles  */ \
		SET_DMA_PHC(p_init->phc)               |  /* peripheral hold cycles  */ \
		SET_DMA_TCD(p_init->tcd_disable)	  |  /* TC chain mode disable   */ \
		SET_DMA_ECE(p_init->ece_enable)	  |  /* ECE chanin mode enable  */ \
		SET_DMA_CH(p_init->ch_enable)	|    /* Chain enable 	        */ \
		DMA_CR_MB0				/* must be one */)

#define GET_DMA_POLARITY(chan) chan

#endif

typedef struct {
	unsigned short in_use;	/* set when channel is being used, clr when
				 * available.
				 */
	/*
	 * Valid polarity settings:
	 *   DMAReq_ActiveLow(n)
	 *   DMAAck_ActiveLow(n)
	 *   EOT_ActiveLow(n)
	 *
	 *   n is 0 to max dma chans
	 */
	unsigned int polarity;

	char buffer_enable;	/* Boolean: buffer enable            */
	char tce_enable;	/* Boolean: terminal count enable    */
	char etd_output;	/* Boolean: eot pin is a tc output   */
	char pce;		/* Boolean: parity check enable      */

	/*
	 * Peripheral location:
	 * INTERNAL_PERIPHERAL (UART0 on the 405GP)
	 * EXTERNAL_PERIPHERAL
	 */
	char pl;		/* internal/external peripheral      */

	/*
	 * Valid pwidth settings:
	 *   PW_8
	 *   PW_16
	 *   PW_32
	 *   PW_64
	 */
	unsigned int pwidth;

	char dai;		/* Boolean: dst address increment   */
	char sai;		/* Boolean: src address increment   */

	/*
	 * Valid psc settings: 0-3
	 */
	unsigned int psc;	/* Peripheral Setup Cycles         */

	/*
	 * Valid pwc settings:
	 * 0-63
	 */
	unsigned int pwc;	/* Peripheral Wait Cycles          */

	/*
	 * Valid phc settings:
	 * 0-7
	 */
	unsigned int phc;	/* Peripheral Hold Cycles          */

	/*
	 * Valid cp (channel priority) settings:
	 *   PRIORITY_LOW
	 *   PRIORITY_MID_LOW
	 *   PRIORITY_MID_HIGH
	 *   PRIORITY_HIGH
	 */
	unsigned int cp;	/* channel priority                */

	/*
	 * Valid pf (memory read prefetch) settings:
	 *
	 *   PREFETCH_1
	 *   PREFETCH_2
	 *   PREFETCH_4
	 */
	unsigned int pf;	/* memory read prefetch            */

	/*
	 * Boolean: channel interrupt enable
	 * NOTE: for sgl transfers, only the last descriptor will be setup to
	 * interrupt.
	 */
	char int_enable;

	char shift;		/* easy access to byte_count shift, based on */
	/* the width of the channel                  */

	uint32_t control;	/* channel control word                      */

	/* These variabled are used ONLY in single dma transfers              */
	unsigned int mode;	/* transfer mode                     */
	phys_addr_t addr;
	char ce;		/* channel enable */
#ifdef CONFIG_STB03xxx
	char ch_enable;
	char tcd_disable;
	char ece_enable;
	char td;		/* transfer direction */
#endif

	char int_on_final_sg;/* for scatter/gather - only interrupt on last sg */
} ppc_dma_ch_t;

/*
 * PPC44x DMA implementations have a slightly different
 * descriptor layout.  Probably moved about due to the
 * change to 64-bit addresses and link pointer. I don't
 * know why they didn't just leave control_count after
 * the dst_addr.
 */
#ifdef PPC4xx_DMA_64BIT
typedef struct {
	uint32_t control;
	uint32_t control_count;
	phys_addr_t src_addr;
	phys_addr_t dst_addr;
	phys_addr_t next;
} ppc_sgl_t;
#else
typedef struct {
	uint32_t control;
	phys_addr_t src_addr;
	phys_addr_t dst_addr;
	uint32_t control_count;
	uint32_t next;
} ppc_sgl_t;
#endif

typedef struct {
	unsigned int dmanr;
	uint32_t control;	/* channel ctrl word; loaded from each descrptr */
	uint32_t sgl_control;	/* LK, TCI, ETI, and ERI bits in sgl descriptor */
	dma_addr_t dma_addr;	/* dma (physical) address of this list          */
	ppc_sgl_t *phead;
	dma_addr_t phead_dma;
	ppc_sgl_t *ptail;
	dma_addr_t ptail_dma;
} sgl_list_info_t;

typedef struct {
	phys_addr_t *src_addr;
	phys_addr_t *dst_addr;
	phys_addr_t dma_src_addr;
	phys_addr_t dma_dst_addr;
} pci_alloc_desc_t;

extern ppc_dma_ch_t dma_channels[];

/*
 * The DMA API are in ppc4xx_dma.c and ppc4xx_sgdma.c
 */
extern int ppc4xx_init_dma_channel(unsigned int, ppc_dma_ch_t *);
extern int ppc4xx_get_channel_config(unsigned int, ppc_dma_ch_t *);
extern int ppc4xx_set_channel_priority(unsigned int, unsigned int);
extern unsigned int ppc4xx_get_peripheral_width(unsigned int);
extern void ppc4xx_set_sg_addr(int, phys_addr_t);
extern int ppc4xx_add_dma_sgl(sgl_handle_t, phys_addr_t, phys_addr_t, unsigned int);
extern void ppc4xx_enable_dma_sgl(sgl_handle_t);
extern void ppc4xx_disable_dma_sgl(sgl_handle_t);
extern int ppc4xx_get_dma_sgl_residue(sgl_handle_t, phys_addr_t *, phys_addr_t *);
extern int ppc4xx_delete_dma_sgl_element(sgl_handle_t, phys_addr_t *, phys_addr_t *);
extern int ppc4xx_alloc_dma_handle(sgl_handle_t *, unsigned int, unsigned int);
extern void ppc4xx_free_dma_handle(sgl_handle_t);
extern int ppc4xx_get_dma_status(void);
extern int ppc4xx_enable_burst(unsigned int);
extern int ppc4xx_disable_burst(unsigned int);
extern int ppc4xx_set_burst_size(unsigned int, unsigned int);
extern void ppc4xx_set_src_addr(int dmanr, phys_addr_t src_addr);
extern void ppc4xx_set_dst_addr(int dmanr, phys_addr_t dst_addr);
extern void ppc4xx_enable_dma(unsigned int dmanr);
extern void ppc4xx_disable_dma(unsigned int dmanr);
extern void ppc4xx_set_dma_count(unsigned int dmanr, unsigned int count);
extern int ppc4xx_get_dma_residue(unsigned int dmanr);
extern void ppc4xx_set_dma_addr2(unsigned int dmanr, phys_addr_t src_dma_addr,
				 phys_addr_t dst_dma_addr);
extern int ppc4xx_enable_dma_interrupt(unsigned int dmanr);
extern int ppc4xx_disable_dma_interrupt(unsigned int dmanr);
extern int ppc4xx_clr_dma_status(unsigned int dmanr);
extern int ppc4xx_map_dma_port(unsigned int dmanr, unsigned int ocp_dma,short dma_chan);
extern int ppc4xx_disable_dma_port(unsigned int dmanr, unsigned int ocp_dma,short dma_chan);
extern int ppc4xx_set_dma_mode(unsigned int dmanr, unsigned int mode);

/* These are in kernel/dma.c: */

/* reserve a DMA channel */
extern int request_dma(unsigned int dmanr, const char *device_id);
/* release it again */
extern void free_dma(unsigned int dmanr);
#endif
#endif				/* __KERNEL__ */