sleb_sdtr.c

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        select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5] | 
        select_stop_bits[new_config->stop] |
        select_parity[new_config->parity];
    HAL_SPARC_86940_WRITE(SDTR_CONTROL(port), mode);
    // Set baud rate clock.
    // ***** CAUTION! Both ports use the same time, thus they must both run at the same baud rate!
    clk = *SLEB_CLOCK_SWITCH;  // Compute board speed
    if (clk & 0x80)  clk = 10;
    clk = (clk & 0x3F) * 1000000;  // in MHz
    tval = (clk / (baud_divisor * 32)) - 1;
    HAL_SPARC_86940_WRITE(SLEB_TIMER3_RELOAD, tval);
    // Set up control register
    sdtr_chan->cmd_reg = SDTR_CMD_RTS | SDTR_CMD_DTR | SDTR_CMD_TxEN;
#ifdef CYGPKG_IO_SERIAL_SPARCLITE_SLEB_CON1
    // Cygmon needs the receiver
    if ((chan->out_cbuf.len != 0) || (chan == &sleb_sdtr_channel0)) {
#else
    if (chan->out_cbuf.len != 0) {
#endif
        sdtr_chan->cmd_reg |= SDTR_CMD_RxEN;
    }
    if (init) {
        sdtr_chan->xmit_enabled = false;
    }
    HAL_SPARC_86940_WRITE(SDTR_CONTROL(port), sdtr_chan->cmd_reg);
    if (new_config != &chan->config)
        chan->config = *new_config;
    return true;
}

// Function to initialize the device.  Called at bootstrap time.
static bool 
sleb_sdtr_init(struct cyg_devtab_entry *tab)
{
    serial_channel *chan = (serial_channel *)tab->priv;
    sleb_sdtr_info *sdtr_chan = (sleb_sdtr_info *)chan->dev_priv;
#ifdef CYGDBG_IO_INIT
    diag_printf("SLEB SERIAL init - dev: %x.%d.%d\n", sdtr_chan->base, sdtr_chan->tx_int_num, sdtr_chan->rx_int_num);
#endif
    (chan->callbacks->serial_init)(chan);  // Really only required for interrupt driven devices
    if (chan->out_cbuf.len != 0) {
        cyg_drv_interrupt_create(sdtr_chan->tx_int_num,
                                 99,                     // Priority - unused
                                 (cyg_addrword_t)chan,   //  Data item passed to interrupt handler
                                 sleb_sdtr_tx_ISR,
                                 sleb_sdtr_tx_DSR,
                                 &sdtr_chan->tx_serial_interrupt_handle,
                                 &sdtr_chan->tx_serial_interrupt);
        cyg_drv_interrupt_attach(sdtr_chan->tx_serial_interrupt_handle);
        cyg_drv_interrupt_mask(sdtr_chan->tx_int_num);
        cyg_drv_interrupt_create(sdtr_chan->rx_int_num,
                                 99,                     // Priority - unused
                                 (cyg_addrword_t)chan,   //  Data item passed to interrupt handler
                                 sleb_sdtr_rx_ISR,
                                 sleb_sdtr_rx_DSR,
                                 &sdtr_chan->rx_serial_interrupt_handle,
                                 &sdtr_chan->rx_serial_interrupt);
        cyg_drv_interrupt_attach(sdtr_chan->rx_serial_interrupt_handle);
        cyg_drv_interrupt_unmask(sdtr_chan->rx_int_num);
    }
    sleb_sdtr_config_port(chan, &chan->config, true);
    return true;
}

// This routine is called when the device is "looked" up (i.e. attached)
static Cyg_ErrNo 
sleb_sdtr_lookup(struct cyg_devtab_entry **tab, 
                  struct cyg_devtab_entry *sub_tab,
                  const char *name)
{
    serial_channel *chan = (serial_channel *)(*tab)->priv;
    (chan->callbacks->serial_init)(chan);  // Really only required for interrupt driven devices
    return ENOERR;
}

// Send a character to the device output buffer.
// Return 'true' if character is sent to device
static bool
sleb_sdtr_putc(serial_channel *chan, unsigned char c)
{
    sleb_sdtr_info *sdtr_chan = (sleb_sdtr_info *)chan->dev_priv;
    CYG_ADDRWORD port = sdtr_chan->base;
    cyg_uint8 status;
    HAL_SPARC_86940_READ(SDTR_STATUS(port), status);
    if (status & SDTR_STAT_TxRDY) {
// Transmit buffer is empty
        HAL_SPARC_86940_WRITE(SDTR_TXDATA(port), c);
        return true;
    } else {
// No space
        return false;
    }
}

// Fetch a character from the device input buffer, waiting if necessary
static unsigned char 
sleb_sdtr_getc(serial_channel *chan)
{
    unsigned char c;
    sleb_sdtr_info *sdtr_chan = (sleb_sdtr_info *)chan->dev_priv;
    CYG_ADDRWORD port = sdtr_chan->base;
    cyg_uint8 status;
    HAL_SPARC_86940_READ(SDTR_STATUS(port), status);
    while ((status & SDTR_STAT_RxRDY) == 0) 
        HAL_SPARC_86940_READ(SDTR_STATUS(port), status);  // Wait for char
    HAL_SPARC_86940_READ(SDTR_RXDATA(port), c);
    return c;
}

// Set up the device characteristics; baud rate, etc.
static Cyg_ErrNo
sleb_sdtr_set_config(serial_channel *chan, cyg_uint32 key,
                     const void *xbuf, cyg_uint32 *len)
{
    switch (key) {
    case CYG_IO_SET_CONFIG_SERIAL_INFO:
      {
        cyg_serial_info_t *config = (cyg_serial_info_t *)xbuf;
        if ( *len < sizeof(cyg_serial_info_t) ) {
            return -EINVAL;
        }
        *len = sizeof(cyg_serial_info_t);
        if ( true != sleb_sdtr_config_port(chan, config, false) )
            return -EINVAL;
      }
      break;
    default:
        return -EINVAL;
    }
    return ENOERR;
}

// Enable the transmitter on the device
static void
sleb_sdtr_start_xmit(serial_channel *chan)
{
    sleb_sdtr_info *sdtr_chan = (sleb_sdtr_info *)chan->dev_priv;
    sdtr_chan->xmit_enabled = true;
    cyg_drv_interrupt_unmask(sdtr_chan->tx_int_num);
}

// Disable the transmitter on the device
static void 
sleb_sdtr_stop_xmit(serial_channel *chan)
{
    sleb_sdtr_info *sdtr_chan = (sleb_sdtr_info *)chan->dev_priv;
    cyg_drv_interrupt_mask(sdtr_chan->tx_int_num);
    sdtr_chan->xmit_enabled = false;
}

// Serial I/O - low level interrupt handler (ISR)
static cyg_uint32 
sleb_sdtr_tx_ISR(cyg_vector_t vector, cyg_addrword_t data)
{
    serial_channel *chan = (serial_channel *)data;
    sleb_sdtr_info *sdtr_chan = (sleb_sdtr_info *)chan->dev_priv;
    cyg_drv_interrupt_mask(sdtr_chan->tx_int_num);
    cyg_drv_interrupt_acknowledge(sdtr_chan->tx_int_num);
    return CYG_ISR_CALL_DSR;  // Cause DSR to be run
}

// Serial I/O - high level interrupt handler (DSR)
static void       
sleb_sdtr_tx_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
{
    serial_channel *chan = (serial_channel *)data;
    sleb_sdtr_info *sdtr_chan = (sleb_sdtr_info *)chan->dev_priv;
    (chan->callbacks->xmt_char)(chan);
    if (sdtr_chan->xmit_enabled)
        cyg_drv_interrupt_unmask(sdtr_chan->tx_int_num);
}

// Serial I/O - low level interrupt handler (ISR)
static cyg_uint32 
sleb_sdtr_rx_ISR(cyg_vector_t vector, cyg_addrword_t data)
{
    serial_channel *chan = (serial_channel *)data;
    sleb_sdtr_info *sdtr_chan = (sleb_sdtr_info *)chan->dev_priv;
    cyg_drv_interrupt_mask(sdtr_chan->rx_int_num);
    return CYG_ISR_CALL_DSR;  // Cause DSR to be run
}

// Serial I/O - high level interrupt handler (DSR)
static void       
sleb_sdtr_rx_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
{
    serial_channel *chan = (serial_channel *)data;
    sleb_sdtr_info *sdtr_chan = (sleb_sdtr_info *)chan->dev_priv;
    CYG_ADDRWORD port = sdtr_chan->base;
    cyg_uint8 status, c;
    HAL_SPARC_86940_READ(SDTR_STATUS(port), status);
    if ((status & SDTR_STAT_RxRDY) != 0) {
        HAL_SPARC_86940_READ(SDTR_RXDATA(port), c);
        (chan->callbacks->rcv_char)(chan, c);
    }
    cyg_drv_interrupt_acknowledge(sdtr_chan->rx_int_num);
    cyg_drv_interrupt_unmask(sdtr_chan->rx_int_num);
}

#endif //  CYGPKG_IO_SERIAL_SPARCLITE_SLEB