quicc_smc_serial.c

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DEVTAB_ENTRY(quicc_smc_serial_io_scc2, 
             CYGDAT_IO_SERIAL_POWERPC_QUICC_SMC_SCC2_NAME,
             0,                     // Does not depend on a lower level interface
             &cyg_io_serial_devio, 
             quicc_sxx_serial_init, 
             quicc_sxx_serial_lookup,     // Serial driver may need initializing
             &quicc_sxx_serial_channel_scc2
    );
#endif //  CYGPKG_IO_SERIAL_POWERPC_QUICC_SMC_SCC2

#ifdef CYGPKG_IO_SERIAL_POWERPC_QUICC_SMC_SCC3
static quicc_sxx_serial_info quicc_sxx_serial_info_scc3 = {
    QUICC_CPM_SCC3,                     // Channel indicator
    CYGNUM_HAL_INTERRUPT_CPM_SCC3,      // interrupt
    _SCC_CHAN
};
#if CYGNUM_IO_SERIAL_POWERPC_QUICC_SMC_SCC3_BUFSIZE > 0
static unsigned char quicc_smc_serial_out_buf_scc3[CYGNUM_IO_SERIAL_POWERPC_QUICC_SMC_SCC3_BUFSIZE];
static unsigned char quicc_smc_serial_in_buf_scc3[CYGNUM_IO_SERIAL_POWERPC_QUICC_SMC_SCC3_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(quicc_sxx_serial_channel_scc3,
                                       quicc_sxx_serial_funs, 
                                       quicc_sxx_serial_info_scc3,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_QUICC_SMC_SCC3_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &quicc_smc_serial_out_buf_scc3[0], sizeof(quicc_smc_serial_out_buf_scc3),
                                       &quicc_smc_serial_in_buf_scc3[0], sizeof(quicc_smc_serial_in_buf_scc3)
    );
#else
static SERIAL_CHANNEL(quicc_sxx_serial_channel_scc3,
                      quicc_sxx_serial_funs, 
                      quicc_sxx_serial_info_scc3,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_QUICC_SMC_SCC3_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif
static unsigned char quicc_scc3_txbuf[CYGNUM_IO_SERIAL_POWERPC_QUICC_SMC_SCC3_TxNUM*CYGNUM_IO_SERIAL_POWERPC_QUICC_SMC_SCC3_TxSIZE] __attribute__((aligned(HAL_DCACHE_LINE_SIZE)));
static unsigned char quicc_scc3_rxbuf[CYGNUM_IO_SERIAL_POWERPC_QUICC_SMC_SCC3_RxNUM*CYGNUM_IO_SERIAL_POWERPC_QUICC_SMC_SCC3_RxSIZE] __attribute__((aligned(HAL_DCACHE_LINE_SIZE)));

DEVTAB_ENTRY(quicc_smc_serial_io_scc3, 
             CYGDAT_IO_SERIAL_POWERPC_QUICC_SMC_SCC3_NAME,
             0,                     // Does not depend on a lower level interface
             &cyg_io_serial_devio, 
             quicc_sxx_serial_init, 
             quicc_sxx_serial_lookup,     // Serial driver may need initializing
             &quicc_sxx_serial_channel_scc3
    );
#endif //  CYGPKG_IO_SERIAL_POWERPC_QUICC_SMC_SCC3

// Internal function to actually configure the hardware to desired baud rate, etc.
static bool
quicc_smc_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
{
    quicc_sxx_serial_info *smc_chan = (quicc_sxx_serial_info *)chan->dev_priv;
    unsigned int baud_divisor = select_baud[new_config->baud];
    cyg_uint32 _lcr;
    EPPC *eppc = eppc_base();
    volatile struct smc_regs *ctl = (volatile struct smc_regs *)smc_chan->ctl;

    if (baud_divisor == 0) return false;
    // Disable channel during setup
    ctl->smc_smcmr = QUICC_SMCMR_UART;  // Disabled, UART mode
    HAL_IO_BARRIER();  // Inforce I/O ordering
    // Disable port interrupts while changing hardware
    _lcr = smc_select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5] | 
        smc_select_stop_bits[new_config->stop] |
        smc_select_parity[new_config->parity];
    // Stop transmitter while changing baud rate
    eppc->cp_cr = smc_chan->channel | QUICC_SMC_CMD_Go | QUICC_SMC_CMD_StopTx;
    HAL_IO_BARRIER();  // Inforce I/O ordering
    // Set baud rate generator
    *smc_chan->brg = 0x10000 | (UART_BITRATE(baud_divisor)<<1);

    // Enable channel with new configuration
    ctl->smc_smcmr = QUICC_SMCMR_UART|QUICC_SMCMR_TEN|QUICC_SMCMR_REN|_lcr;
    HAL_IO_BARRIER();  // Inforce I/O ordering
    eppc->cp_cr = smc_chan->channel | QUICC_SMC_CMD_Go | QUICC_SMC_CMD_RestartTx;
    if (new_config != &chan->config) {
        chan->config = *new_config;
    }
    return true;
}

// Function to set up internal tables for device.
static void
quicc_smc_serial_init_info(quicc_sxx_serial_info *smc_chan,
                           volatile struct smc_uart_pram *uart_pram,
                           volatile struct smc_regs *ctl,
                           int TxBD, int TxNUM, int TxSIZE,
                           cyg_uint8 *TxBUF,
                           int RxBD, int RxNUM, int RxSIZE,
                           cyg_uint8 *RxBUF,
                           int portBmask,
                           int port)
{
    EPPC *eppc = eppc_base();
    struct cp_bufdesc *txbd, *rxbd;
    int i;
    
    smc_chan->pram = (void *)uart_pram;
    smc_chan->ctl = (void *)ctl;

    // Set up baud rate generator
    smc_chan->brg = _mpc8xx_allocate_brg(port);

    // Disable channel during setup
    ctl->smc_smcmr = QUICC_SMCMR_UART;  // Disabled, UART mode

    /*
     *  Set up the PortB pins for UART operation.
     *  Set PAR and DIR to allow SMCTXDx and SMRXDx
     *  (Table 16-39)
     */
    eppc->pip_pbpar |= portBmask;
    eppc->pip_pbdir &= ~portBmask;
    /*
     *  SDMA & LCD bus request level 5
     *  (Section 16.10.2.1)
     */
    eppc->dma_sdcr = 1;
    /*
     *  Set Rx and Tx function code
     *  (Section 16.15.4.2)
     */
    uart_pram->rfcr = 0x18;
    uart_pram->tfcr = 0x18;
    /*
     *  Set pointers to buffer descriptors.
     *  (Sections 16.15.4.1, 16.15.7.12, and 16.15.7.13)
     */
    uart_pram->rbase = RxBD;
    uart_pram->tbase = TxBD;
    /* tx and rx buffer descriptors */
    txbd = (struct cp_bufdesc *)((char *)eppc + TxBD);
    rxbd = (struct cp_bufdesc *)((char *)eppc + RxBD);
    smc_chan->txbd = txbd;
    smc_chan->tbase = txbd;
    smc_chan->txsize = TxSIZE;
    smc_chan->rxbd = rxbd;
    smc_chan->rbase = rxbd;
    smc_chan->rxsize = RxSIZE;
    /* max receive buffer length */
    uart_pram->mrblr = RxSIZE;
    /* set max_idle feature - generate interrupt after 4 chars idle period */
    uart_pram->max_idl = 4;
    /* no last brk char received */
    uart_pram->brkln = 0;
    /* no break condition occurred */
    uart_pram->brkec = 0;
    /* 1 break char sent on top XMIT */
    uart_pram->brkcr = 1;
    /* setup RX buffer descriptors */
    for (i = 0;  i < RxNUM;  i++) {
        rxbd->length = 0;
        rxbd->buffer = RxBUF;
        rxbd->ctrl   = QUICC_BD_CTL_Ready | QUICC_BD_CTL_Int;
        if (i == (RxNUM-1)) rxbd->ctrl |= QUICC_BD_CTL_Wrap;  // Last buffer
        RxBUF += RxSIZE;
        rxbd++;
    }
    /* setup TX buffer descriptors */
    for (i = 0;  i < TxNUM;  i++) {
        txbd->length = 0;
        txbd->buffer = TxBUF;
        txbd->ctrl   = 0;
        if (i == (TxNUM-1)) txbd->ctrl |= QUICC_BD_CTL_Wrap;  // Last buffer
        TxBUF += TxSIZE;
        txbd++;
    }
    /*
     *  Reset Rx & Tx params
     */
    HAL_IO_BARRIER();  // Inforce I/O ordering
    eppc->cp_cr = smc_chan->channel | QUICC_SMC_CMD_Go | QUICC_SMC_CMD_InitTxRx;
    HAL_IO_BARRIER();  // Inforce I/O ordering
    /*
     *  Clear any previous events. Enable interrupts.
     *  (Section 16.15.7.14 and 16.15.7.15)
     */
    ctl->smc_smce = 0xFF;
    ctl->smc_smcm = QUICC_SMCE_BSY|QUICC_SMCE_TX|QUICC_SMCE_RX;
}

// Internal function to actually configure the hardware to desired baud rate, etc.
static bool
quicc_scc_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
{
    quicc_sxx_serial_info *scc_chan = (quicc_sxx_serial_info *)chan->dev_priv;
    unsigned int baud_divisor = select_baud[new_config->baud];
    EPPC *eppc = eppc_base();
    volatile struct scc_regs *regs = (volatile struct scc_regs *)scc_chan->ctl;

    if (baud_divisor == 0) return false;
    // Set baud rate generator
    *scc_chan->brg = 0x10000 | (UART_BITRATE(baud_divisor)<<1);
    // Disable channel during setup
    HAL_IO_BARRIER();  // Inforce I/O ordering
    regs->scc_gsmr_l = 0;
    regs->scc_psmr = QUICC_SCC_PSMR_ASYNC | 
        scc_select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5] | 
        scc_select_stop_bits[new_config->stop] |
        scc_select_parity[new_config->parity];

    // Enable channel with new configuration
    regs->scc_gsmr_h = 0x20;          // 8bit FIFO
    regs->scc_gsmr_l = 0x00028004;    // 16x TxCLK, 16x RxCLK, UART

    /*
     *  Init Rx & Tx params for SCCX
     */
    HAL_IO_BARRIER();  // Inforce I/O ordering
    eppc->cp_cr = QUICC_CPM_CR_INIT_TXRX | scc_chan->channel | QUICC_CPM_CR_BUSY;

    HAL_IO_BARRIER();  // Inforce I/O ordering
    regs->scc_gsmr_l |= (QUICC_SCC_GSMR_L_Tx | QUICC_SCC_GSMR_L_Rx);  // Enable Rx, Tx
    if (new_config != &chan->config) {
        chan->config = *new_config;
    }
    return true;
}

// Function to set up internal tables for device.
static void
quicc_scc_serial_init_info(quicc_sxx_serial_info *scc_chan,
                           volatile struct uart_pram *uart_pram,
                           volatile struct scc_regs *ctl,
                           int TxBD, int TxNUM, int TxSIZE,
                           cyg_uint8 *TxBUF,
                           int RxBD, int RxNUM, int RxSIZE,
                           cyg_uint8 *RxBUF,
                           int portAmask, int portBmask, int portCmask,
                           int port)
{
    EPPC *eppc = eppc_base();
    struct cp_bufdesc *txbd, *rxbd;
    int i;

    // Disable channel during setup
    ctl->scc_gsmr_l = 0;
    scc_chan->pram = (void *)uart_pram;
    scc_chan->ctl = (void *)ctl;

    // Set up baud rate generator
    scc_chan->brg = _mpc8xx_allocate_brg(port);

    /*
     *  Set up the PortA/B/C pins for UART operation.
     */
    eppc->pio_papar |= portAmask;
    eppc->pio_padir &= ~portAmask;
    eppc->pio_paodr &= ~portAmask;

    eppc->pio_pcdir &= portCmask;
    eppc->pio_pcpar &= portCmask;
    eppc->pio_pcso  |= portCmask;

    eppc->pip_pbpar |= portBmask;
    eppc->pip_pbdir |= portBmask;

    /*
     *  SDMA & LCD bus request level 5
     *  (Section 16.10.2.1)
     */
    eppc->dma_sdcr = 1;
    /*
     *  Set Rx and Tx function code
     *  (Section 16.15.4.2)
     */
    uart_pram->rfcr = 0x18;