mipsidt_serial.c

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//==========================================================================
//
//      mipsidt_serial.c
//
//      Serial device driver for MIPS IDT79s334a reference platform on-chip serial devices
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file 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 the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    tmichals based on driver by dmoseley, based on POWERPC driver by jskov
// Contributors: gthomas, jskov, dmoseley, tmichals
// Date:         2003-02-13
// Purpose:      MIPS IDT79s334a reference platform serial device driver
// Description:  IDT MIPS serial device driver
//
// To Do:
//   Put in magic to effectively use the FIFOs. Transmitter FIFO fill is a
//   problem, and setting receiver FIFO interrupts to happen only after
//   n chars may conflict with hal diag.
//
//####DESCRIPTIONEND####
//
//==========================================================================

#include <pkgconf/io_serial.h>
#include <pkgconf/io.h>

#include <cyg/io/io.h>
#include <cyg/hal/hal_intr.h>
#include <cyg/io/devtab.h>
#include <cyg/infra/diag.h>
#include <cyg/io/serial.h>

#ifdef CYGPKG_IO_SERIAL_MIPS_IDT79S334A

#include "mipsidt_serial.h"

typedef struct mipsidt_serial_info {
    CYG_ADDRWORD   base;
    CYG_WORD       int_num;
    cyg_interrupt  serial_interrupt;
    cyg_handle_t   serial_interrupt_handle;
    cyg_uint8      iir;
} mipsidt_serial_info;

static bool mipsidt_serial_init(struct cyg_devtab_entry *tab);
static bool mipsidt_serial_putc(serial_channel *chan, unsigned char c);
static Cyg_ErrNo mipsidt_serial_lookup(struct cyg_devtab_entry **tab, 
                                   struct cyg_devtab_entry *sub_tab,
                                   const char *name);
static unsigned char mipsidt_serial_getc(serial_channel *chan);
static Cyg_ErrNo mipsidt_serial_set_config(serial_channel *chan, cyg_uint32 key,
                                         const void *xbuf, cyg_uint32 *len);
static void mipsidt_serial_start_xmit(serial_channel *chan);
static void mipsidt_serial_stop_xmit(serial_channel *chan);

static cyg_uint32 mipsidt_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);
static void       mipsidt_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);

static SERIAL_FUNS(mipsidt_serial_funs, 
                   mipsidt_serial_putc, 
                   mipsidt_serial_getc,
                   mipsidt_serial_set_config,
                   mipsidt_serial_start_xmit,
                   mipsidt_serial_stop_xmit
    );


#ifdef CYGPKG_IO_SERIAL_MIPS_IDT79S334A_SERIAL_A
static mipsidt_serial_info mipsidt_serial_info0 ={IDTMIPS_SER_16550_BASE_A,  
						  CYGNUM_HAL_INTERRUPT_SIO_0};

#if CYGNUM_IO_SERIAL_MIPS_IDT79S334A_SERIAL_A_BUFSIZE > 0
static unsigned char mipsidt_serial_out_buf0[CYGNUM_IO_SERIAL_MIPS_IDT79S334A_SERIAL_A_BUFSIZE];
static unsigned char mipsidt_serial_in_buf0[CYGNUM_IO_SERIAL_MIPS_IDT79S334A_SERIAL_A_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(mipsidt_serial_channel0,
                                       mipsidt_serial_funs, 
                                       mipsidt_serial_info0,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_MIPS_IDT79S334A_SERIAL_A_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &mipsidt_serial_out_buf0[0], 
                                       sizeof(mipsidt_serial_out_buf0),
                                       &mipsidt_serial_in_buf0[0], 
                                       sizeof(mipsidt_serial_in_buf0)
    );
#else
static SERIAL_CHANNEL(mipsidt_serial_channel0,
                      mipsidt_serial_funs, 
                      mipsidt_serial_info0,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_MIPS_IDT79S334A_SERIAL_A_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif

DEVTAB_ENTRY(mipsidt_serial_io0, 
             CYGDAT_IO_SERIAL_MIPS_IDT79S334A_SERIAL_A_NAME,
             0,                 // Does not depend on a lower level interface
             &cyg_io_serial_devio, 
             mipsidt_serial_init, 
             mipsidt_serial_lookup,     // Serial driver may need initializing
             &mipsidt_serial_channel0
    );

#endif

#ifdef CYGPKG_IO_SERIAL_MIPS_IDT79S334A_SERIAL_B
static mipsidt_serial_info mipsidt_serial_info1 ={IDTMIPS_SER_16550_BASE_B,
						  CYGNUM_HAL_INTERRUPT_SIO_1};

#if CYGNUM_IO_SERIAL_MIPS_IDT79S334A_SERIAL_B_BUFSIZE > 0
static unsigned char mipsidt_serial_out_buf1[CYGNUM_IO_SERIAL_MIPS_IDT79S334A_SERIAL_B_BUFSIZE];
static unsigned char mipsidt_serial_in_buf1[CYGNUM_IO_SERIAL_MIPS_IDT79S334A_SERIAL_B_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(mipsidt_serial_channel1,
                                       mipsidt_serial_funs,
                                       mipsidt_serial_info1,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_MIPS_IDT79S334A_SERIAL_B_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &mipsidt_serial_out_buf1[0],
                                       sizeof(mipsidt_serial_out_buf1),
                                       &mipsidt_serial_in_buf1[0],
                                       sizeof(mipsidt_serial_in_buf1)
    );
#else
static SERIAL_CHANNEL(mipsidt_serial_channel1,
                      mipsidt_serial_funs,
                      mipsidt_serial_info1,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_MIPS_IDT79S334A_SERIAL_B_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif

DEVTAB_ENTRY(mipsidt_serial_io1,
             CYGDAT_IO_SERIAL_MIPS_IDT79S334A_SERIAL_B_NAME,
             0,                 // Does not depend on a lower level interface
             &cyg_io_serial_devio,
             mipsidt_serial_init,
             mipsidt_serial_lookup,     // Serial driver may need initializing
             &mipsidt_serial_channel1
    );

#endif

// Internal function to actually configure the hardware to desired baud rate, etc.
static bool
mipsidt_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
{
    mipsidt_serial_info *mipsidt_chan = (mipsidt_serial_info *)chan->dev_priv;
    cyg_addrword_t port = mipsidt_chan->base;
    cyg_uint32 baud_divisor = select_baud[new_config->baud]; ;
    cyg_uint8 _lcr, _ier;

    if (baud_divisor == 0)
        return false;    // Invalid baud rate selected

	baud_divisor = (CYGHWR_HAL_MIPS_CPU_FREQ_ACTUAL * 10) / (16 * select_baud[new_config->baud]);

	baud_divisor +=5;
	baud_divisor =  ((cyg_int32)baud_divisor) / 10;