edb7xxx_serial.c

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//==========================================================================
//
//      io/serial/arm/edb7xxx_serial.c
//
//      Cirrus Logic EDB7XXX 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):   gthomas
// Contributors:  gthomas
// Date:        1999-02-04
// Purpose:     EDB7XXX Serial I/O module (interrupt driven version)
// Description: 
//
//####DESCRIPTIONEND####
//
//==========================================================================

#include <pkgconf/system.h>
#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/io/serial.h>
#include <cyg/infra/diag.h>

#ifdef CYGPKG_IO_SERIAL_ARM_EDB7XXX

#include "edb7xxx_serial.h"

typedef struct edb7xxx_serial_info {
    CYG_ADDRWORD   data,                      // Pointer to data register
                   control,                   // Pointer to baud rate/line control register
                   stat,                      // Pointer to system flags for this port
                   syscon;                    // Pointer to system control for this port
    CYG_WORD       tx_int_num,                // Transmit interrupt number
                   rx_int_num,                // Receive interrupt number
                   ms_int_num;                // Modem Status Change interrupt number
    cyg_interrupt  serial_tx_interrupt, 
                   serial_rx_interrupt, 
                   serial_ms_interrupt;
    cyg_handle_t   serial_tx_interrupt_handle, 
                   serial_rx_interrupt_handle, 
                   serial_ms_interrupt_handle;
    bool           tx_enabled;
} edb7xxx_serial_info;

static bool edb7xxx_serial_init(struct cyg_devtab_entry *tab);
static bool edb7xxx_serial_putc(serial_channel *chan, unsigned char c);
static Cyg_ErrNo edb7xxx_serial_lookup(struct cyg_devtab_entry **tab, 
                                   struct cyg_devtab_entry *sub_tab,
                                   const char *name);
static unsigned char edb7xxx_serial_getc(serial_channel *chan);
static Cyg_ErrNo edb7xxx_serial_set_config(serial_channel *chan, cyg_uint32 key,
                                           const void *xbuf, cyg_uint32 *len);
static void edb7xxx_serial_start_xmit(serial_channel *chan);
static void edb7xxx_serial_stop_xmit(serial_channel *chan);

static cyg_uint32 edb7xxx_serial_tx_ISR(cyg_vector_t vector, cyg_addrword_t data);
static void       edb7xxx_serial_tx_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);
static cyg_uint32 edb7xxx_serial_rx_ISR(cyg_vector_t vector, cyg_addrword_t data);
static void       edb7xxx_serial_rx_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);
static cyg_uint32 edb7xxx_serial_ms_ISR(cyg_vector_t vector, cyg_addrword_t data);
static void       edb7xxx_serial_ms_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);

static SERIAL_FUNS(edb7xxx_serial_funs, 
                   edb7xxx_serial_putc, 
                   edb7xxx_serial_getc,
                   edb7xxx_serial_set_config,
                   edb7xxx_serial_start_xmit,
                   edb7xxx_serial_stop_xmit
    );

#ifdef CYGPKG_IO_SERIAL_ARM_EDB7XXX_SERIAL1
static edb7xxx_serial_info edb7xxx_serial_info1 = {UARTDR1, // Data register
                                                 UBLCR1,  // Port control
                                                 SYSFLG1, // Status
                                                 SYSCON1, // System config
                                                 CYGNUM_HAL_INTERRUPT_UTXINT1, // Tx interrupt
                                                 CYGNUM_HAL_INTERRUPT_URXINT1, // Rx interrupt
                                                 0 /*CYGNUM_HAL_INTERRUPT_UMSINT*/}; // Modem control
#if CYGNUM_IO_SERIAL_ARM_EDB7XXX_SERIAL1_BUFSIZE > 0
static unsigned char edb7xxx_serial_out_buf1[CYGNUM_IO_SERIAL_ARM_EDB7XXX_SERIAL1_BUFSIZE];
static unsigned char edb7xxx_serial_in_buf1[CYGNUM_IO_SERIAL_ARM_EDB7XXX_SERIAL1_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(edb7xxx_serial_channel1,
                                       edb7xxx_serial_funs, 
                                       edb7xxx_serial_info1,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_EDB7XXX_SERIAL1_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &edb7xxx_serial_out_buf1[0], sizeof(edb7xxx_serial_out_buf1),
                                       &edb7xxx_serial_in_buf1[0], sizeof(edb7xxx_serial_in_buf1)
    );
#else
static SERIAL_CHANNEL(edb7xxx_serial_channel1,
                      edb7xxx_serial_funs, 
                      edb7xxx_serial_info1,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_EDB7XXX_SERIAL1_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif

DEVTAB_ENTRY(edb7xxx_serial_io1, 
             CYGDAT_IO_SERIAL_ARM_EDB7XXX_SERIAL1_NAME,
             0,                     // Does not depend on a lower level interface
             &cyg_io_serial_devio, 
             edb7xxx_serial_init, 
             edb7xxx_serial_lookup,     // Serial driver may need initializing
             &edb7xxx_serial_channel1
    );
#endif //  CYGPKG_IO_SERIAL_ARM_EDB7XXX_SERIAL2

#ifdef CYGPKG_IO_SERIAL_ARM_EDB7XXX_SERIAL2
static edb7xxx_serial_info edb7xxx_serial_info2 = {UARTDR2, // Data register
                                                 UBLCR2,  // Port control
                                                 SYSFLG2, // Status
                                                 SYSCON2, // System config
                                                 CYGNUM_HAL_INTERRUPT_UTXINT2, // Tx interrupt
                                                 CYGNUM_HAL_INTERRUPT_URXINT2, // Rx interrupt
                                                 0};      // No modem control
#if CYGNUM_IO_SERIAL_ARM_EDB7XXX_SERIAL2_BUFSIZE > 0
static unsigned char edb7xxx_serial_out_buf2[CYGNUM_IO_SERIAL_ARM_EDB7XXX_SERIAL2_BUFSIZE];
static unsigned char edb7xxx_serial_in_buf2[CYGNUM_IO_SERIAL_ARM_EDB7XXX_SERIAL2_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(edb7xxx_serial_channel2,
                                       edb7xxx_serial_funs, 
                                       edb7xxx_serial_info2,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_EDB7XXX_SERIAL2_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &edb7xxx_serial_out_buf2[0], sizeof(edb7xxx_serial_out_buf2),
                                       &edb7xxx_serial_in_buf2[0], sizeof(edb7xxx_serial_in_buf2)
    );
#else
static SERIAL_CHANNEL(edb7xxx_serial_channel2,
                      edb7xxx_serial_funs, 
                      edb7xxx_serial_info2,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_EDB7XXX_SERIAL2_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif

DEVTAB_ENTRY(edb7xxx_serial_io2, 
             CYGDAT_IO_SERIAL_ARM_EDB7XXX_SERIAL2_NAME,
             0,                     // Does not depend on a lower level interface
             &cyg_io_serial_devio, 
             edb7xxx_serial_init, 
             edb7xxx_serial_lookup,     // Serial driver may need initializing
             &edb7xxx_serial_channel2
    );
#endif //  CYGPKG_IO_SERIAL_ARM_EDB7XXX_SERIAL2

// Internal function to actually configure the hardware to desired baud rate, etc.
static bool
edb7xxx_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
{
    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;
    volatile cyg_uint32 *syscon = (volatile cyg_uint32 *)edb7xxx_chan->syscon;
    volatile cyg_uint32 *blcfg = (volatile cyg_uint32 *)edb7xxx_chan->control;