cogent_serial_with_ints.c

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//==========================================================================
//
//      io/serial/powerpc/cogent_serial_with_ints.c
//
//      PowerPC Cogent Serial I/O Interface Module (interrupt driven)
//
//==========================================================================
//####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):   jskov, based on ARM driver by gthomas
// Contributors:gthomas, jskov
// Date:        1999-03-02
// Purpose:     Cogent Serial I/O module (interrupt driven version)
// Description: 
//
// 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_POWERPC_COGENT

#include "cogent_serial.h"

// Make sure the configuration is sane.
#if defined(CYGPKG_IO_SERIAL_POWERPC_COGENT_SERIAL_A) && \
    defined(CYGPKG_IO_SERIAL_POWERPC_COGENT_SERIAL_B) && \
    !defined(CYGIMP_KERNEL_INTERRUPTS_CHAIN)
#error "Need CYGIMP_KERNEL_INTERRUPTS_CHAIN to support both ports"
#endif


#define BUFSIZE 128

typedef struct cogent_serial_info {
    CYG_ADDRWORD   base;
    CYG_WORD       int_num;
    cyg_interrupt  serial_interrupt;
    cyg_handle_t   serial_interrupt_handle;
} cogent_serial_info;

static bool cogent_serial_init(struct cyg_devtab_entry *tab);
static bool cogent_serial_putc(serial_channel *chan, unsigned char c);
static Cyg_ErrNo cogent_serial_lookup(struct cyg_devtab_entry **tab, 
                                   struct cyg_devtab_entry *sub_tab,
                                   const char *name);
static unsigned char cogent_serial_getc(serial_channel *chan);
static Cyg_ErrNo cogent_serial_set_config(serial_channel *chan, cyg_uint32 key,
                                          const void *xbuf, cyg_uint32 *len);
static void cogent_serial_start_xmit(serial_channel *chan);
static void cogent_serial_stop_xmit(serial_channel *chan);

static cyg_uint32 cogent_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);
static void       cogent_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);

static SERIAL_FUNS(cogent_serial_funs, 
                   cogent_serial_putc, 
                   cogent_serial_getc,
                   cogent_serial_set_config,
                   cogent_serial_start_xmit,
                   cogent_serial_stop_xmit
    );

#ifdef CYGPKG_IO_SERIAL_POWERPC_COGENT_SERIAL_A
static cogent_serial_info cogent_serial_info0 ={CMA_SER_16550_BASE_A, 
                                                CYGNUM_HAL_INTERRUPT_SIU_IRQ1};
#if CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_A_BUFSIZE > 0
static unsigned char cogent_serial_out_buf0[CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_A_BUFSIZE];
static unsigned char cogent_serial_in_buf0[CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_A_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(cogent_serial_channel0,
                                       cogent_serial_funs, 
                                       cogent_serial_info0,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_A_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &cogent_serial_out_buf0[0], 
                                       sizeof(cogent_serial_out_buf0),
                                       &cogent_serial_in_buf0[0], 
                                       sizeof(cogent_serial_in_buf0)
    );
#else
static SERIAL_CHANNEL(cogent_serial_channel0,
                      cogent_serial_funs, 
                      cogent_serial_info0,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_A_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif

DEVTAB_ENTRY(cogent_serial_io0, 
             CYGDAT_IO_SERIAL_POWERPC_COGENT_SERIAL_A_NAME,
             0,                 // Does not depend on a lower level interface
             &cyg_io_serial_devio, 
             cogent_serial_init, 
             cogent_serial_lookup,     // Serial driver may need initializing
             &cogent_serial_channel0
    );
#endif

#ifdef CYGPKG_IO_SERIAL_POWERPC_COGENT_SERIAL_B
static cogent_serial_info cogent_serial_info1 ={CMA_SER_16550_BASE_B, 
                                                CYGNUM_HAL_INTERRUPT_SIU_IRQ1};
#if CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_B_BUFSIZE > 0
static unsigned char cogent_serial_out_buf1[CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_B_BUFSIZE];
static unsigned char cogent_serial_in_buf1[CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_B_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(cogent_serial_channel1,
                                       cogent_serial_funs, 
                                       cogent_serial_info1,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_B_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &cogent_serial_out_buf1[0], 
                                       sizeof(cogent_serial_out_buf1),
                                       &cogent_serial_in_buf1[0], 
                                       sizeof(cogent_serial_in_buf1)
    );
#else
static SERIAL_CHANNEL(cogent_serial_channel1,
                      cogent_serial_funs, 
                      cogent_serial_info1,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_B_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif

DEVTAB_ENTRY(cogent_serial_io1, 
             CYGDAT_IO_SERIAL_POWERPC_COGENT_SERIAL_B_NAME,
             0,                   // Does not depend on a lower level interface
             &cyg_io_serial_devio, 
             cogent_serial_init, 
             cogent_serial_lookup,     // Serial driver may need initializing
             &cogent_serial_channel1
    );
#endif



// Internal function to actually configure the hardware to desired baud rate, etc.
static bool
cogent_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
{
    cogent_serial_info *cogent_chan = (cogent_serial_info *)chan->dev_priv;
    cyg_addrword_t port = cogent_chan->base;
    cyg_uint16 baud_divisor = select_baud[new_config->baud];
    cyg_uint8 _lcr, _ier;

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

    // Disable port interrupts while changing hardware