integrator_serial_with_ints.c

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//==========================================================================
//
//      io/serial/arm/integrator_serial_with_ints.c
//
//      ARM INTEGRATOR 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):    David A Rusling
// Contributors: Philippe Robin
// Date:         November 7, 2000
// Purpose:      INTEGRATOR Serial I/O module (interrupt driven)
// Description: 
//
//####DESCRIPTIONEND####
//
//==========================================================================

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

#ifdef CYGPKG_IO_SERIAL_ARM_INTEGRATOR
#include "integrator_serial.h"

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

static bool integrator_serial_init(struct cyg_devtab_entry *tab);
static bool integrator_serial_putc(serial_channel *chan, unsigned char c);
static Cyg_ErrNo integrator_serial_lookup(struct cyg_devtab_entry **tab, 
                                   struct cyg_devtab_entry *sub_tab,
                                   const char *name);
static unsigned char integrator_serial_getc(serial_channel *chan);
static Cyg_ErrNo integrator_serial_set_config(serial_channel *chan, cyg_uint32 key,
					      const void *xbuf, cyg_uint32 *len);
static void integrator_serial_start_xmit(serial_channel *chan);
static void integrator_serial_stop_xmit(serial_channel *chan);

static cyg_uint32 integrator_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);
static void       integrator_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);

static SERIAL_FUNS(integrator_serial_funs, 
                   integrator_serial_putc, 
                   integrator_serial_getc,
                   integrator_serial_set_config,
                   integrator_serial_start_xmit,
                   integrator_serial_stop_xmit
    );

#ifdef CYGPKG_IO_SERIAL_ARM_INTEGRATOR_SERIAL0
#define INTEGRATOR_UART0_BASE           0x16000000	 /*  UART 0 */
static integrator_serial_info integrator_serial_info0 = {INTEGRATOR_UART0_BASE, CYGNUM_HAL_INTERRUPT_UARTINT0};
#if CYGNUM_IO_SERIAL_ARM_INTEGRATOR_SERIAL0_BUFSIZE > 0
static unsigned char integrator_serial_out_buf0[CYGNUM_IO_SERIAL_ARM_INTEGRATOR_SERIAL0_BUFSIZE];
static unsigned char integrator_serial_in_buf0[CYGNUM_IO_SERIAL_ARM_INTEGRATOR_SERIAL0_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(integrator_serial_channel0,
                                       integrator_serial_funs, 
                                       integrator_serial_info0,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_INTEGRATOR_SERIAL0_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &integrator_serial_out_buf0[0], sizeof(integrator_serial_out_buf0),
                                       &integrator_serial_in_buf0[0], sizeof(integrator_serial_in_buf0)
    );
#else
static SERIAL_CHANNEL(integrator_serial_channel0,
                      integrator_serial_funs, 
                      integrator_serial_info0,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_INTEGRATOR_SERIAL0_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif

DEVTAB_ENTRY(integrator_serial_io0, 
             CYGDAT_IO_SERIAL_ARM_INTEGRATOR_SERIAL0_NAME,
             0,                     // Does not depend on a lower level interface
             &cyg_io_serial_devio, 
             integrator_serial_init, 
             integrator_serial_lookup,     // Serial driver may need initializing
             &integrator_serial_channel0
    );
#endif //  CYGPKG_IO_SERIAL_ARM_INTEGRATOR_SERIAL0

#ifdef CYGPKG_IO_SERIAL_ARM_INTEGRATOR_SERIAL1
#define INTEGRATOR_UART1_BASE           0x17000000	 /*  UART 1 */
static integrator_serial_info integrator_serial_info1 = {INTEGRATOR_UART1_BASE, CYGNUM_HAL_INTERRUPT_UARTINT1};
#if CYGNUM_IO_SERIAL_ARM_INTEGRATOR_SERIAL1_BUFSIZE > 0
static unsigned char integrator_serial_out_buf1[CYGNUM_IO_SERIAL_ARM_INTEGRATOR_SERIAL1_BUFSIZE];
static unsigned char integrator_serial_in_buf1[CYGNUM_IO_SERIAL_ARM_INTEGRATOR_SERIAL1_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(integrator_serial_channel1,
                                       integrator_serial_funs, 
                                       integrator_serial_info1,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_INTEGRATOR_SERIAL1_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &integrator_serial_out_buf1[0], sizeof(integrator_serial_out_buf1),
                                       &integrator_serial_in_buf1[0], sizeof(integrator_serial_in_buf1)
    );
#else
static SERIAL_CHANNEL(integrator_serial_channel1,
                      integrator_serial_funs, 
                      integrator_serial_info1,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_INTEGRATOR_SERIAL1_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif

DEVTAB_ENTRY(integrator_serial_io1, 
             CYGDAT_IO_SERIAL_ARM_INTEGRATOR_SERIAL1_NAME,
             0,                     // Does not depend on a lower level interface
             &cyg_io_serial_devio, 
             integrator_serial_init, 
             integrator_serial_lookup,     // Serial driver may need initializing
             &integrator_serial_channel1
    );
#endif //  CYGPKG_IO_SERIAL_ARM_INTEGRATOR_SERIAL1

#define GET_INTERRUPT_STATUS(p)           IO_READ((p) + AMBA_UARTIIR)
#define GET_STATUS(p)		          (IO_READ((p) + AMBA_UARTFR))
#define GET_CHAR(p)		          (IO_READ((p) + AMBA_UARTDR))
#define PUT_CHAR(p, c)		          (IO_WRITE(((p) + AMBA_UARTDR), (c)))
#define IO_READ(p)                        ((*(volatile unsigned int *)(p)) & 0xFF)
#define IO_WRITE(p, c)                    (*(unsigned int *)(p) = (c))
#define RX_DATA(s)		          (((s) & AMBA_UARTFR_RXFE) == 0)
#define TX_READY(s)		          (((s) & AMBA_UARTFR_TXFF) == 0)
#define TX_EMPTY(p)		          ((GET_STATUS(p) & AMBA_UARTFR_TMSK) == 0)

// debugging help
static int chars_rx = 0 ;
static int chars_tx = 0 ;

// Internal function to actually configure the hardware to desired baud rate, etc.
static bool
integrator_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
{
    integrator_serial_info *integrator_chan = (integrator_serial_info *)chan->dev_priv;
    unsigned int port = (unsigned int)integrator_chan->base;
    unsigned short baud_divisor = select_baud[new_config->baud];
    unsigned char _lcr ;

    // don't do this baud rate...
    if (baud_divisor == 0) return false;  // Invalid configuration

    // first, disable everything 
    IO_WRITE(port + AMBA_UARTCR, 0x0);

    // Set baud rate 
    IO_WRITE(port + AMBA_UARTLCR_M, ((baud_divisor & 0xf00) >> 8));
    IO_WRITE(port + AMBA_UARTLCR_L, (baud_divisor & 0xff));