gr1553bm.h

/*  GR1553B BM driver
 *
 *  COPYRIGHT (c) 2010.
 *  Cobham Gaisler AB.
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.org/license/LICENSE.
 */

#ifndef __GR1553BM_H__
#define __GR1553BM_H__

#ifdef __cplusplus
extern "C" {
#endif

/* Register GR1553B driver needed by BM driver */
extern void gr1553bm_register(void);

struct gr1553bm_entry {
    uint32_t time;  /* bit31=1, bit 30=0 */
    uint32_t data;  /* bit31=0, bit 30=0 */
};

#define GR1553BM_ERROPTS_MANL 0x02
#define GR1553BM_ERROPTS_UDWL 0x04
#define GR1553BM_ERROPTS_IMCL 0x08
#define GR1553BM_ERROPTS_ALL  0x0e

/* Function used to implement a custom copy routine.
 * Returns number of bytes the desctionation address 
 * should be incremented with.
 *
 * \param dst        Optional Destination address
 * \param src        Source DMA address
 * \param nentires   Number of entries to be processed.
 * \param data       Custom Data (set by config)
 */
typedef int (*bmcopy_func_t)(
    unsigned int dst,
    struct gr1553bm_entry *src,
    int nentries,
    void *data
    );

/* IRQ function callback, called on BM DMA error */
typedef void (*bmisr_func_t)(void *bm, void *data);

/* BM driver configuration */
struct gr1553bm_config {

    /*** Time options ***/

    /* 8-bit time resolution, the BM will update the time according
     * to this setting. 0 will make the time tag be of highest
     * resolution (no division), 1 will make the BM increment the
     * time tag once for two time ticks (div with 2), etc.
     */
    uint8_t time_resolution;

    /* Enable Time Overflow IRQ handling. Setting this to 1 
     * makes the driver to update the 64-bit time by it self,
     * it will use time overflow IRQ to detect when the 64-bit
     * time counter must be incremented.
     *
     * If set to zero, the driver expect the user to call
     * gr1553bm_time() regularly, it must be called more often
     * than the time overflows to avoid an incorrect time.
     */
    int time_ovf_irq;



    /*** Filtering options ***/

    /* Bus error log options 
     *
     * bit0,4-31 = reserved, set to zero
     * Bit1 = Enables logging of Invalid mode code errors
     * Bit2 = Enables logging of Unexpected Data errors
     * Bit3 = Enables logging of Manchester/parity errors
     */
    unsigned int filt_error_options;

    /* RT Address filtering bit mask. Each bit enables (if set)
     * logging of a certain RT sub address. Bit 31 enables logging
     * of broadcast messages.
     */
    unsigned int filt_rtadr;

    /* RT Subaddress filtering bit mask, bit definition:
     *  31:     Enables logging of mode commands on subadr 31
     *  1..30:  BitN enables/disables logging of RT subadr N
     *  0:      Enables logging of mode commands on subadr 0
     */
    unsigned int filt_subadr;

    /* Mode code Filter, is written into "BM RT Mode code filter"
     * register, please see hardware manual for bit declarations.
     */
    unsigned int filt_mc;



    /*** Buffer options ***/

    /* Size of buffer in bytes, must be aligned to 8-byte 
     * The size is limited to max 4Mb.
     */
    unsigned int buffer_size;

    /* Custom buffer, must be aligned to 8-byte and be of buffer_size
     * length. If NULL dynamic memory allocation is used.
     */
    void *buffer_custom;

    /* Custom Copy function, may be used to implement a more 
     * effective way of copying the DMA buffer. For example
     * the DMA log may need to be compressed before copied
     * onto a storage, this function can be used to avoid an
     * extra copy.
     */
    bmcopy_func_t copy_func;

    /* Optional Custom Data passed on to copy_func() */
    void *copy_func_arg;



    /*** Interrupt options ***/

    /* Custom DMA error function, note that this function is called
     * from Interrupt Context. Set to NULL to disable this callback.
     */
    bmisr_func_t dma_error_isr;

    /* Optional Custom Data passed on to dma_error_isr() */
    void *dma_error_arg;
};

/* Open BM device by instance number (minor)
 *
 * The return value is used as input parameter in all other function calls
 * in the A
 */
extern void *gr1553bm_open(int minor);

/* Close previously opened Bm device */
extern void gr1553bm_close(void *bm);

/* Configure the BM driver before starting */
extern int gr1553bm_config(void *bm, struct gr1553bm_config *cfg);

/* Start logging */
extern int gr1553bm_start(void *bm);

/* Get 64-bit 1553 Time. Low 24-bit time is acquired from BM hardware,
 * the MSB is taken from a software counter internal to the driver. The
 * counter is incremented every time the Time overflows by:
 *  - using "Time overflow" IRQ if enabled in user configuration
 *  - by checking IRQ flag (IRQ disabled), it is required that user
 *    calls this function before the next time overflow.
 *
 * The BM timer is limited to 24-bits, in order to handle overflows
 * correctly and maintain a valid time an Interrupt handler is used
 * or this function must be called when IRQ is not used.
 *
 * Update software time counters and return the current time.
 */
extern void gr1553bm_time(void *bm, uint64_t *time);

/* Return zero when logging has not been started, non-zero when logging
 * has been started
 */
extern int gr1553bm_started(void *bm);

/* Check how many entries are currently stored in the BM Log DMA-area */
extern int gr1553bm_available(void *bm, int *nentries);

/* Stop logging */
extern void gr1553bm_stop(void *bm);

/* Read a maximum number of entries from LOG buffer. This function
 * must be 
 *
 * Arguments
 *  bm           - Private pointer returned by gr1553bm_open()
 *  dst          - Address where log data is written
 *  max          - (IN/OUT) Maximum number of entires, when successfull
 *                 the number of entries actually written is stored
 *                 into the address of max.
 *
 * Result
 *  0   = success
 *  -1  = fail. (may be due to BM logging not started)
 */
extern int gr1553bm_read(void *bm, struct gr1553bm_entry *dst, int *max);

#ifdef __cplusplus
}
#endif

#endif /* __GR1553BM_H__ */