hal_diag.c

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/*=============================================================================
//
//      hal_diag.c
//
//      HAL diagnostic output code
//
//=============================================================================
//####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):   nickg
// Contributors:        nickg
// Date:        1998-03-02
// Purpose:     HAL diagnostic output
// Description: Implementations of HAL diagnostic output support.
//
//####DESCRIPTIONEND####
//
//===========================================================================*/

#include <pkgconf/hal.h>

#include <cyg/infra/cyg_type.h>          // base types
#include <cyg/infra/cyg_trac.h>         // tracing macros
#include <cyg/infra/cyg_ass.h>          // assertion macros

#include <cyg/hal/hal_diag.h>
#include <cyg/hal/hal_intr.h>
#include <cyg/hal/hal_misc.h>

/*---------------------------------------------------------------------------*/
/* Select default diag channel to use                                        */

//#define CYG_KERNEL_DIAG_ROMART
//#define CYG_KERNEL_DIAG_SERIAL0
//#define CYG_KERNEL_DIAG_SERIAL1
//#define CYG_KERNEL_DIAG_SERIAL2
//#define CYG_KERNEL_DIAG_BUFFER
//#define CYG_KERNEL_DIAG_GDB

#if !defined(CYG_KERNEL_DIAG_SERIAL0) && \
    !defined(CYG_KERNEL_DIAG_SERIAL1) && \
    !defined(CYG_KERNEL_DIAG_SERIAL2) && \
    !defined(CYG_KERNEL_DIAG_ROMART)

#if defined(CYGSEM_HAL_USE_ROM_MONITOR_GDB_stubs)

#define CYG_KERNEL_DIAG_SERIAL0
#define CYG_KERNEL_DIAG_GDB

#else

#define CYG_KERNEL_DIAG_SERIAL0

#endif

#endif

//#define CYG_HAL_MN10300_STB_SERIAL2

/*---------------------------------------------------------------------------*/
// MN10300 Serial line

#if defined(CYG_HAL_MN10300_STB_SERIAL0) || defined(CYG_KERNEL_DIAG_SERIAL0)

// We use serial0 on AM33
#define SERIAL0_CR       ((volatile cyg_uint16 *)0xd4002000)
#define SERIAL0_ICR      ((volatile cyg_uint8 *) 0xd4002004)
#define SERIAL0_TXR      ((volatile cyg_uint8 *) 0xd4002008)
#define SERIAL0_RXR      ((volatile cyg_uint8 *) 0xd4002009)
#define SERIAL0_SR       ((volatile cyg_uint16 *)0xd400200c)

// Timer 2 provides baud rate divisor
#define TIMER0_MD       ((volatile cyg_uint8 *)0xd4003002)
#define TIMER0_BR       ((volatile cyg_uint8 *)0xd4003012)
#define TIMER0_CR       ((volatile cyg_uint8 *)0xd4003022)

// Timer 0 provides a prescaler for lower baud rates
#define HW_TIMER0_MD       ((volatile cyg_uint8 *)0xd4003000)
#define HW_TIMER0_BR       ((volatile cyg_uint8 *)0xd4003010)
#define HW_TIMER0_CR       ((volatile cyg_uint8 *)0xd4003020)

#define SIO_LSTAT_TRDY  0x20
#define SIO_LSTAT_RRDY  0x10

#define SERIAL_CR_TXE   0x8000

void hal_diag_init_serial0(void)
{
#if 1    
    // 99 translates to 38400 baud.
    *TIMER0_BR = 99;
    // Timer0 sourced from IOCLK
    *TIMER0_MD = 0x80;    
#else
    // 1 and 198 translate into 9800 baud
    *TIMER0_BR = 1;
    *TIMER0_MD = 0x84;          // source = timer 0 overflow
    *HW_TIMER0_BR = 198;        // timer 0 base register
    *HW_TIMER0_CR = 0x80;       // source from ioclk
#endif
    
    // No interrupts for now.
    *SERIAL0_ICR = 0x00;

    // Source from timer 1, 8bit chars, enable tx and rx
    *SERIAL0_CR = 0xc085;    
}

void hal_diag_write_char_serial0(char c)
{
    register volatile cyg_uint16 *volatile tty_status = SERIAL0_SR;
    register volatile cyg_uint8 *volatile tty_tx = SERIAL0_TXR;

    while( (*tty_status & SIO_LSTAT_TRDY) != 0 ) continue;

    *tty_tx = c;
}

void hal_diag_drain_serial0(void)
{
    register volatile cyg_uint16 *volatile tty_status = SERIAL0_SR;

    while( (*tty_status & SIO_LSTAT_TRDY) != 0 ) continue;
}

void hal_diag_read_char_serial0(char *c)
{
    register volatile cyg_uint16 *volatile tty_status = SERIAL0_SR;
    register volatile cyg_uint8 *volatile tty_rx = SERIAL0_RXR;

    while( (*tty_status & SIO_LSTAT_RRDY) == 0 ) continue;

    *c = *tty_rx;

    // We must ack the interrupt caused by that read to avoid
    // confusing the GDB stub ROM.
    HAL_INTERRUPT_ACKNOWLEDGE( CYGNUM_HAL_INTERRUPT_SERIAL_0_RX );    
}

#if defined(CYG_KERNEL_DIAG_SERIAL0)

#define hal_diag_init_serial hal_diag_init_serial0
#define hal_diag_write_char_serial hal_diag_write_char_serial0
#define hal_diag_drain_serial hal_diag_drain_serial0
#define hal_diag_read_char_serial hal_diag_read_char_serial0

#endif

#endif

/*---------------------------------------------------------------------------*/
// MN10300 Serial line

#if defined(CYG_HAL_MN10300_STB_SERIAL1) || defined(CYG_KERNEL_DIAG_SERIAL1)

// We use serial1 on MN103002
#define SERIAL1_CR       ((volatile cyg_uint16 *)0xd4002010)
#define SERIAL1_ICR      ((volatile cyg_uint8 *) 0xd4002014)
#define SERIAL1_TXR      ((volatile cyg_uint8 *) 0xd4002018)
#define SERIAL1_RXR      ((volatile cyg_uint8 *) 0xd4002019)
#define SERIAL1_SR       ((volatile cyg_uint16 *)0xd400201c)

// Timer 1 provided baud rate divisor
#define TIMER1_MD       ((volatile cyg_uint8 *)0xd4003001)
#define TIMER1_BR       ((volatile cyg_uint8 *)0xd4003011)
#define TIMER1_CR       ((volatile cyg_uint8 *)0xd4003021)

// Timer 0 provides a prescaler for lower baud rates
#define HW_TIMER0_MD       ((volatile cyg_uint8 *)0xd4003000)
#define HW_TIMER0_BR       ((volatile cyg_uint8 *)0xd4003010)
#define HW_TIMER0_CR       ((volatile cyg_uint8 *)0xd4003020)

#define SIO1_LSTAT_TRDY  0x20
#define SIO1_LSTAT_RRDY  0x10

#define SERIAL_CR_TXE   0x8000

void hal_diag_init_serial1(void)
{
#if 1    
    // 99 translates to 38400 baud.
    *TIMER1_BR = 99;

    // Timer1 sourced from IOCLK
    *TIMER1_MD = 0x80;    

#else

    // 1 and 198 translate into 9800 baud
    *TIMER1_BR = 1;
    *TIMER1_MD = 0x84;          // source = timer 0 overflow
    *HW_TIMER0_BR = 198;        // timer 0 base register
    *HW_TIMER0_CR = 0x80;       // source from ioclk
#endif
    
    // No interrupts for now.
    *SERIAL1_ICR = 0x00;

    // Source from timer 1, 8bit chars, enable tx and rx
    *SERIAL1_CR = 0xc084;    
}

void hal_diag_write_char_serial1(char c)
{
    register volatile cyg_uint16 *volatile tty_status = SERIAL1_SR;
    register volatile cyg_uint8 *volatile tty_tx = SERIAL1_TXR;

    while( (*tty_status & SIO1_LSTAT_TRDY) != 0 ) continue;

    *tty_tx = c;
}

void hal_diag_drain_serial1(void)
{
    register volatile cyg_uint16 *volatile tty_status = SERIAL1_SR;

    while( (*tty_status & SIO1_LSTAT_TRDY) != 0 ) continue;
}

void hal_diag_read_char_serial1(char *c)
{
    register volatile cyg_uint16 *volatile tty_status = SERIAL1_SR;
    register volatile cyg_uint8 *volatile tty_rx = SERIAL1_RXR;

    while( (*tty_status & SIO1_LSTAT_RRDY) == 0 ) continue;

    *c = *tty_rx;

    // We must ack the interrupt caused by that read to avoid
    // confusing the GDB stub ROM.
    HAL_INTERRUPT_ACKNOWLEDGE( CYGNUM_HAL_INTERRUPT_SERIAL_1_RX );