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//==========================================================================

//

//      io/serial/arm/sa11x0/sa11x0_serial.c

//

//      StrongARM SA11x0 Serial I/O Interface Module (interrupt driven)

//

//==========================================================================

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//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):     gthomas

// Contributors:  gthomas

// Date:          2000-05-08

// Purpose:       StrongARM SA11x0 Serial I/O module (interrupt driven version)

// Description: 

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include <pkgconf/system.h>

#include <pkgconf/io_serial.h>

#include <pkgconf/io.h>

#include <pkgconf/kernel.h>

#include <cyg/io/io.h>

#include <cyg/hal/hal_intr.h>

#include <cyg/io/devtab.h>

#include <cyg/io/serial.h>

#include <cyg/infra/diag.h>

#ifdef CYGPKG_IO_SERIAL_ARM_SA11X0

#include "sa11x0_serial.h"

typedef struct sa11x0_serial_info {

    CYG_ADDRWORD   base;

    CYG_WORD       int_num;

    cyg_interrupt  serial_interrupt;

    cyg_handle_t   serial_interrupt_handle;

} sa11x0_serial_info;

static bool sa11x0_serial_init(struct cyg_devtab_entry *tab);

static bool sa11x0_serial_putc(serial_channel *chan, unsigned char c);

static Cyg_ErrNo sa11x0_serial_lookup(struct cyg_devtab_entry **tab,

                                   struct cyg_devtab_entry *sub_tab,

                                   const char *name);

static unsigned char sa11x0_serial_getc(serial_channel *chan);

static Cyg_ErrNo sa11x0_serial_set_config(serial_channel *chan, cyg_uint32 key,

                                          const void *xbuf, cyg_uint32 *len);

static void sa11x0_serial_start_xmit(serial_channel *chan);

static void sa11x0_serial_stop_xmit(serial_channel *chan);

static cyg_uint32 sa11x0_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);

static void       sa11x0_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);

static SERIAL_FUNS(sa11x0_serial_funs,

                   sa11x0_serial_putc,

                   sa11x0_serial_getc,

                   sa11x0_serial_set_config,

                   sa11x0_serial_start_xmit,

                   sa11x0_serial_stop_xmit

    );

#ifdef CYGPKG_IO_SERIAL_ARM_SA11X0_SERIAL0

static sa11x0_serial_info sa11x0_serial_info0 = {(CYG_ADDRWORD)SA11X0_UART3_CONTROL0,

                                                 CYGNUM_HAL_INTERRUPT_UART3};

#if CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL0_BUFSIZE > 0

static unsigned char sa11x0_serial_out_buf0[CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL0_BUFSIZE];

static unsigned char sa11x0_serial_in_buf0[CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL0_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(sa11x0_serial_channel0,

                                       sa11x0_serial_funs,

                                       sa11x0_serial_info0,

                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL0_BAUD),

                                       CYG_SERIAL_STOP_DEFAULT,

                                       CYG_SERIAL_PARITY_DEFAULT,

                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,

                                       CYG_SERIAL_FLAGS_DEFAULT,

                                       &sa11x0_serial_out_buf0[0], sizeof(sa11x0_serial_out_buf0),

                                       &sa11x0_serial_in_buf0[0], sizeof(sa11x0_serial_in_buf0)

    );

#else

static SERIAL_CHANNEL(sa11x0_serial_channel0,

                      sa11x0_serial_funs,

                      sa11x0_serial_info0,

                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL0_BAUD),

                      CYG_SERIAL_STOP_DEFAULT,

                      CYG_SERIAL_PARITY_DEFAULT,

                      CYG_SERIAL_WORD_LENGTH_DEFAULT,

                      CYG_SERIAL_FLAGS_DEFAULT

    );

#endif

DEVTAB_ENTRY(sa11x0_serial_io0,

             CYGDAT_IO_SERIAL_ARM_SA11X0_SERIAL0_NAME,

             0,                     // Does not depend on a lower level interface

             &cyg_io_serial_devio,

             sa11x0_serial_init,

             sa11x0_serial_lookup,     // Serial driver may need initializing

             &sa11x0_serial_channel0

    );

#endif //  CYGPKG_IO_SERIAL_ARM_SA11X0_SERIAL1

#ifdef CYGPKG_IO_SERIAL_ARM_SA11X0_SERIAL1

static sa11x0_serial_info sa11x0_serial_info1 = {(CYG_ADDRWORD)SA11X0_UART1_CONTROL0,

                                                 CYGNUM_HAL_INTERRUPT_UART1};

#if CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL1_BUFSIZE > 0

static unsigned char sa11x0_serial_out_buf1[CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL1_BUFSIZE];

static unsigned char sa11x0_serial_in_buf1[CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL1_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(sa11x0_serial_channel1,

                                       sa11x0_serial_funs,

                                       sa11x0_serial_info1,

                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL1_BAUD),

                                       CYG_SERIAL_STOP_DEFAULT,

                                       CYG_SERIAL_PARITY_DEFAULT,

                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,

                                       CYG_SERIAL_FLAGS_DEFAULT,

                                       &sa11x0_serial_out_buf1[0], sizeof(sa11x0_serial_out_buf1),

                                       &sa11x0_serial_in_buf1[0], sizeof(sa11x0_serial_in_buf1)

    );

#else

static SERIAL_CHANNEL(sa11x0_serial_channel1,

                      sa11x0_serial_funs,

                      sa11x0_serial_info1,

                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL1_BAUD),

                      CYG_SERIAL_STOP_DEFAULT,

                      CYG_SERIAL_PARITY_DEFAULT,

                      CYG_SERIAL_WORD_LENGTH_DEFAULT,

                      CYG_SERIAL_FLAGS_DEFAULT

    );

#endif

DEVTAB_ENTRY(sa11x0_serial_io1,

             CYGDAT_IO_SERIAL_ARM_SA11X0_SERIAL1_NAME,

             0,                     // Does not depend on a lower level interface

             &cyg_io_serial_devio,

             sa11x0_serial_init,

             sa11x0_serial_lookup,     // Serial driver may need initializing

             &sa11x0_serial_channel1

    );

#endif //  CYGPKG_IO_SERIAL_ARM_SA11X0_SERIAL1

// Internal function to actually configure the hardware to desired baud rate, etc.

static bool

sa11x0_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)

{

    sa11x0_serial_info *sa11x0_chan = (sa11x0_serial_info *)chan->dev_priv;

    volatile struct serial_port *port = (volatile struct serial_port *)sa11x0_chan->base;

    unsigned char parity = select_parity[new_config->parity];

    unsigned char word_length = select_word_length[new_config->word_length-CYGNUM_SERIAL_WORD_LENGTH_5];

    unsigned char stop_bits = select_stop_bits[new_config->stop];

    int baud = SA11X0_UART_BAUD_RATE_DIVISOR(select_baud[new_config->baud]);

    if ((word_length == 0xFF) ||

        (parity == 0xFF) ||

        (stop_bits == 0xFF)) {

        return false;  // Unsupported configuration

    }

    // Disable Receiver and Transmitter (clears FIFOs)

    port->ctl3 = SA11X0_UART_RX_DISABLED |

                 SA11X0_UART_TX_DISABLED;

    // Clear sticky (writable) status bits.

    port->stat0 = SA11X0_UART_RX_IDLE |

                  SA11X0_UART_RX_BEGIN_OF_BREAK |

                  SA11X0_UART_RX_END_OF_BREAK;

    // Set parity, word length, stop bits

    port->ctl0 = parity |

                 word_length |

                 stop_bits;

    // Set the desired baud rate.

    port->ctl1 = (baud >> 8) & SA11X0_UART_H_BAUD_RATE_DIVISOR_MASK;

    port->ctl2 = baud & SA11X0_UART_L_BAUD_RATE_DIVISOR_MASK;

    // Enable the receiver (with interrupts) and the transmitter.

    port->ctl3 = SA11X0_UART_RX_ENABLED |

                 SA11X0_UART_TX_ENABLED |

                 SA11X0_UART_RX_FIFO_INT_ENABLED;

    return true;

}

// Function to initialize the device.  Called at bootstrap time.

static bool

sa11x0_serial_init(struct cyg_devtab_entry *tab)

{

    serial_channel *chan = (serial_channel *)tab->priv;

    sa11x0_serial_info *sa11x0_chan = (sa11x0_serial_info *)chan->dev_priv;

    int res;

#ifdef CYGDBG_IO_INIT

    diag_printf("SA11X0 SERIAL init - dev: %x.%d\n", sa11x0_chan->base, sa11x0_chan->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(sa11x0_chan->int_num,

                                 99,                     // Priority - unused

                                 (cyg_addrword_t)chan,   // Data item passed to interrupt handler

                                 sa11x0_serial_ISR,

                                 sa11x0_serial_DSR,

                                 &sa11x0_chan->serial_interrupt_handle,

                                 &sa11x0_chan->serial_interrupt);

        cyg_drv_interrupt_attach(sa11x0_chan->serial_interrupt_handle);

        cyg_drv_interrupt_unmask(sa11x0_chan->int_num);

    }

    res = sa11x0_serial_config_port(chan, &chan->config, true);

    return res;

}

// This routine is called when the device is "looked" up (i.e. attached)

static Cyg_ErrNo

sa11x0_serial_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

sa11x0_serial_putc(serial_channel *chan, unsigned char c)

{

    sa11x0_serial_info *sa11x0_chan = (sa11x0_serial_info *)chan->dev_priv;

    volatile struct serial_port *port = (volatile struct serial_port *)sa11x0_chan->base;

    if (port->stat1 & SA11X0_UART_TX_FIFO_NOT_FULL) {

        port->data = c;

        return true;

    } else {

        return false;  // Couldn't send, tx was busy

    }

}

// Fetch a character from the device input buffer, waiting if necessary

static unsigned char

sa11x0_serial_getc(serial_channel *chan)

{

    sa11x0_serial_info *sa11x0_chan = (sa11x0_serial_info *)chan->dev_priv;

    volatile struct serial_port *port = (volatile struct serial_port *)sa11x0_chan->base;

    return port->data;

}

// Set up the device characteristics; baud rate, etc.

static Cyg_ErrNo

sa11x0_serial_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 != sa11x0_serial_config_port(chan, config, false) )

            return -EINVAL;

      }

      break;

    default:

        return -EINVAL;

    }

    return ENOERR;

}

// Enable the transmitter on the device

static void

sa11x0_serial_start_xmit(serial_channel *chan)

{

    sa11x0_serial_info *sa11x0_chan = (sa11x0_serial_info *)chan->dev_priv;

    volatile struct serial_port *port = (volatile struct serial_port *)sa11x0_chan->base;

    (chan->callbacks->xmt_char)(chan);  // Kick transmitter (if necessary)

    port->ctl3 |= SA11X0_UART_TX_FIFO_INT_ENABLED;

}

// Disable the transmitter on the device

static void

sa11x0_serial_stop_xmit(serial_channel *chan)

{

    sa11x0_serial_info *sa11x0_chan = (sa11x0_serial_info *)chan->dev_priv;

    volatile struct serial_port *port = (volatile struct serial_port *)sa11x0_chan->base;

    port->ctl3 &= ~SA11X0_UART_TX_FIFO_INT_ENABLED;

}

// Serial I/O - low level interrupt handler (ISR)

static cyg_uint32

sa11x0_serial_ISR(cyg_vector_t vector, cyg_addrword_t data)

{

    cyg_drv_interrupt_mask(vector);

    cyg_drv_interrupt_acknowledge(vector);

    return CYG_ISR_CALL_DSR;  // Cause DSR to be run

}

// Serial I/O - high level interrupt handler (DSR)

static void

sa11x0_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)

{

    serial_channel *chan = (serial_channel *)data;

    sa11x0_serial_info *sa11x0_chan = (sa11x0_serial_info *)chan->dev_priv;

    volatile struct serial_port *port = (volatile struct serial_port *)sa11x0_chan->base;

    unsigned int stat0 = port->stat0;

    if (stat0 & SA11X0_UART_TX_SERVICE_REQUEST) {

        (chan->callbacks->xmt_char)(chan);

    }

    if (stat0 & SA11X0_UART_RX_INTS) {

        while (port->stat1 & SA11X0_UART_RX_FIFO_NOT_EMPTY) {

            (chan->callbacks->rcv_char)(chan, port->data);

        }

        port->stat0 = SA11X0_UART_RX_IDLE;  // Need to clear this manually

    }

    if (stat0 & (SA11X0_UART_RX_BEGIN_OF_BREAK |

                 SA11X0_UART_RX_END_OF_BREAK ) ) {

        // Need to clear any of these manually also or noise

        // from plugging in can cause an interrupt loop!

        port->stat0 = stat0 & (SA11X0_UART_RX_BEGIN_OF_BREAK |

                               SA11X0_UART_RX_END_OF_BREAK );

    }

    cyg_drv_interrupt_unmask(vector);

}

#endif