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

//

//      io/serial/sparclite/sleb_sdtr.c

//

//      Serial I/O interface module for SPARClite Eval Board (SLEB)

//

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

// ####ECOSGPLCOPYRIGHTBEGIN####                                            

// -------------------------------------------                              

// This file is part of eCos, the Embedded Configurable Operating System.   

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under    

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//

// As a special exception, if other files instantiate templates or use      

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// and link it with other works to produce a work based on this file,       

// this file does not by itself cause the resulting work to be covered by   

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// General Public License v2.                                               

//

// This exception does not invalidate any other reasons why a work based    

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// ####ECOSGPLCOPYRIGHTEND####                                              

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

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

//

// Author(s):   gthomas

// Contributors:  gthomas

// Date:        1999-02-04

// Purpose:     SLEB serial I/O module

// Description: 

//

//####DESCRIPTIONEND####

//

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

#include <pkgconf/io.h>

#include <pkgconf/io_serial.h>

#include <cyg/io/io.h>

#include <cyg/hal/hal_intr.h>

#include <cyg/io/devtab.h>

#include <cyg/io/serial.h>

#ifdef  CYGPKG_IO_SERIAL_SPARCLITE_SLEB

#include "sleb_sdtr.h"

extern void diag_printf(const char *fmt, ...);

#define BUFSIZE 128

typedef struct sleb_sdtr_info {

    CYG_ADDRWORD   base;

    CYG_WORD       tx_int_num;

    CYG_WORD       rx_int_num;

    cyg_interrupt  tx_serial_interrupt;

    cyg_handle_t   tx_serial_interrupt_handle;

    cyg_interrupt  rx_serial_interrupt;

    cyg_handle_t   rx_serial_interrupt_handle;

    cyg_uint8      cmd_reg;

    bool           xmit_enabled;

} sleb_sdtr_info;

static bool sleb_sdtr_init(struct cyg_devtab_entry *tab);

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

static Cyg_ErrNo sleb_sdtr_lookup(struct cyg_devtab_entry **tab,

                                   struct cyg_devtab_entry *sub_tab,

                                   const char *name);

static unsigned char sleb_sdtr_getc(serial_channel *chan);

static Cyg_ErrNo sleb_sdtr_set_config(serial_channel *chan, cyg_uint32 key,

                                      const void *xbuf, cyg_uint32 *len);

static void sleb_sdtr_start_xmit(serial_channel *chan);

static void sleb_sdtr_stop_xmit(serial_channel *chan);

static cyg_uint32 sleb_sdtr_tx_ISR(cyg_vector_t vector, cyg_addrword_t data);

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

static cyg_uint32 sleb_sdtr_rx_ISR(cyg_vector_t vector, cyg_addrword_t data);

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

static SERIAL_FUNS(sleb_sdtr_funs,

                   sleb_sdtr_putc,

                   sleb_sdtr_getc,

                   sleb_sdtr_set_config,

                   sleb_sdtr_start_xmit,

                   sleb_sdtr_stop_xmit

    );

#ifdef CYGPKG_IO_SERIAL_SPARCLITE_SLEB_CON1

static sleb_sdtr_info sleb_sdtr_info0 = {SLEB_SDTR0_BASE, SLEB_SDTR0_TX_INT, SLEB_SDTR0_RX_INT};

#if CYGNUM_IO_SERIAL_SPARCLITE_SLEB_CON1_BUFSIZE > 0

static unsigned char sleb_sdtr_out_buf0[CYGNUM_IO_SERIAL_SPARCLITE_SLEB_CON1_BUFSIZE];

static unsigned char sleb_sdtr_in_buf0[CYGNUM_IO_SERIAL_SPARCLITE_SLEB_CON1_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(sleb_sdtr_channel0,

                                       sleb_sdtr_funs,

                                       sleb_sdtr_info0,

                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_SPARCLITE_SLEB_CON1_BAUD),

                                       CYG_SERIAL_STOP_DEFAULT,

                                       CYG_SERIAL_PARITY_DEFAULT,

                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,

                                       CYG_SERIAL_FLAGS_DEFAULT,

                                       &sleb_sdtr_out_buf0[0], sizeof(sleb_sdtr_out_buf0),

                                       &sleb_sdtr_in_buf0[0], sizeof(sleb_sdtr_in_buf0)

    );

#else

static SERIAL_CHANNEL(sleb_sdtr_channel0,

                      sleb_sdtr_funs,

                      sleb_sdtr_info0,

                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_SPARCLITE_SLEB_CON1_BAUD),

                      CYG_SERIAL_STOP_DEFAULT,

                      CYG_SERIAL_PARITY_DEFAULT,

                      CYG_SERIAL_WORD_LENGTH_DEFAULT,

                      CYG_SERIAL_FLAGS_DEFAULT

    );

#endif

DEVTAB_ENTRY(sleb_sdtr_io0,

             CYGDAT_IO_SERIAL_SPARCLITE_SLEB_CON1_NAME,

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

             &cyg_io_serial_devio,

             sleb_sdtr_init,

             sleb_sdtr_lookup,     // Serial driver may need initializing

             &sleb_sdtr_channel0

    );

#endif // CYGPKG_IO_SERIAL_SPARCLITE_SLEB_CON1

#ifdef  CYGPKG_IO_SERIAL_SPARCLITE_SLEB_CON2

static sleb_sdtr_info sleb_sdtr_info1 = {SLEB_SDTR1_BASE, SLEB_SDTR1_TX_INT, SLEB_SDTR1_RX_INT};

#if CYGNUM_IO_SERIAL_SPARCLITE_SLEB_CON2_BUFSIZE > 0

static unsigned char sleb_sdtr_out_buf1[CYGNUM_IO_SERIAL_SPARCLITE_SLEB_CON2_BUFSIZE];

static unsigned char sleb_sdtr_in_buf1[CYGNUM_IO_SERIAL_SPARCLITE_SLEB_CON2_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(sleb_sdtr_channel1,

                                       sleb_sdtr_funs,

                                       sleb_sdtr_info1,

                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_SPARCLITE_SLEB_CON2_BAUD),

                                       CYG_SERIAL_STOP_DEFAULT,

                                       CYG_SERIAL_PARITY_DEFAULT,

                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,

                                       CYG_SERIAL_FLAGS_DEFAULT,

                                       &sleb_sdtr_out_buf1[0], sizeof(sleb_sdtr_out_buf1),

                                       &sleb_sdtr_in_buf1[0], sizeof(sleb_sdtr_in_buf1)

    );

#else

static SERIAL_CHANNEL(sleb_sdtr_channel1,

                      sleb_sdtr_funs,

                      sleb_sdtr_info1,

                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_SPARCLITE_SLEB_CON2_BAUD),

                      CYG_SERIAL_STOP_DEFAULT,

                      CYG_SERIAL_PARITY_DEFAULT,

                      CYG_SERIAL_WORD_LENGTH_DEFAULT,

                      CYG_SERIAL_FLAGS_DEFAULT

    );

#endif

DEVTAB_ENTRY(sleb_sdtr_io1,

             CYGDAT_IO_SERIAL_SPARCLITE_SLEB_CON2_NAME,

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

             &cyg_io_serial_devio,

             sleb_sdtr_init,

             sleb_sdtr_lookup,     // Serial driver may need initializing

             &sleb_sdtr_channel1

    );

#endif // CYGPKG_IO_SERIAL_SPARCLITE_SLEB_CON2

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

static bool

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

{

    sleb_sdtr_info *sdtr_chan = (sleb_sdtr_info *)chan->dev_priv;

    CYG_ADDRWORD port = sdtr_chan->base;

    cyg_int32 baud_divisor;

    cyg_int32 clk, tval;

    unsigned char mode;

#if 0

    if ((new_config->baud < CYGNUM_SERIAL_BAUD_MIN) || (new_config->baud > CYGNUM_SERIAL_BAUD_MAX))

        return false;  // Invalid baud rate

#endif

    baud_divisor = select_baud[new_config->baud];

    if (baud_divisor == 0)

        return false; // Unsupported baud rate

    // Reset the port

    HAL_SPARC_86940_WRITE(SDTR_CONTROL(port), SDTR_CMD_RST);

    // Write the mode

    mode = SDTR_MODE_MODE_ASYNC16 |

        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