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_arch.h>
#include <cyg/hal/hal_diag.h>

#include <cyg/hal/hal_intr.h>

#include <cyg/hal/hal_io.h>

/*---------------------------------------------------------------------------*/

//#define CYG_KERNEL_DIAG_LCD
#define CYG_KERNEL_DIAG_SERIAL0 // For ROM start but see immediately below:

#if defined(CYGSEM_HAL_USE_ROM_MONITOR_CygMon)
#undef CYG_KERNEL_DIAG_SERIAL0
#undef CYG_KERNEL_DIAG_LCD
#define CYG_KERNEL_DIAG_CYGMON
#define CYG_KERNEL_DIAG_GDB

#endif

/*---------------------------------------------------------------------------*/

static cyg_uint8 leds = 0;

void hal_diag_led(int x)
{
//    return;
    leds ^= x;
    
    HAL_WRITE_UINT8( 0xfffff504, leds);

#if 0
    {
        int i;

        for( i = 0; i < 0x00020000; i++ );
    }
#endif    
}

/*---------------------------------------------------------------------------*/

#if defined(CYG_KERNEL_DIAG_SERIAL0) || defined(CYG_KERNEL_DIAG_CYGMON)

#define DIAG_BASE       0xfffff300
#define DIAG_SLCR       (DIAG_BASE+0x00)
#define DIAG_SLSR       (DIAG_BASE+0x04)
#define DIAG_SLDICR     (DIAG_BASE+0x08)
#define DIAG_SLDISR     (DIAG_BASE+0x0C)
#define DIAG_SFCR       (DIAG_BASE+0x10)
#define DIAG_SBRG       (DIAG_BASE+0x14)
#define DIAG_TFIFO      (DIAG_BASE+0x20)
#define DIAG_RFIFO      (DIAG_BASE+0x30)

#define BRG_T0          0x0000
#define BRG_T2          0x0100
#define BRG_T4          0x0200
#define BRG_T5          0x0300


void hal_diag_init()
{
#if defined(CYGSEM_HAL_USE_ROM_MONITOR)
// If we are using the ROM monitor, it has already
// initialized the serial line.
#else
//hal_diag_led(0x10);    
    HAL_WRITE_UINT16( DIAG_SLCR , 0x0020 );

    HAL_WRITE_UINT16( DIAG_SLDICR , 0x0000 );
    
    HAL_WRITE_UINT16( DIAG_SFCR , 0x0000 );

#if CYGHWR_HAL_MIPS_CPU_FREQ == 50
//    HAL_WRITE_UINT16( DIAG_SBRG , BRG_T2 | 20 );    // 9600 bps
//    HAL_WRITE_UINT16( DIAG_SBRG , BRG_T2 | 10 );    // 19200 bps
    HAL_WRITE_UINT16( DIAG_SBRG , BRG_T2 | 5 );     // 38400 bps
#elif CYGHWR_HAL_MIPS_CPU_FREQ == 66
//    HAL_WRITE_UINT16( DIAG_SBRG , BRG_T2 | 27 );    // 9600 bps
//    HAL_WRITE_UINT16( DIAG_SBRG , BRG_T0 | 54 );    // 19200 bps
    HAL_WRITE_UINT16( DIAG_SBRG , BRG_T0 | 27 );    // 38400 bps
#else
#error Unsupported CPU frequency
#endif
//hal_diag_led(0x10);
#endif    
}

void hal_diag_write_char_serial0( char c)
{
    CYG_WORD16 disr;
    
//hal_diag_led(0x20);

    for(;;)
    {
        HAL_READ_UINT16( DIAG_SLDISR , disr );

        if( disr & 0x0002 ) break;
    }

    disr = disr & ~0x0002;
    
    HAL_WRITE_UINT8( DIAG_TFIFO, c );

    HAL_WRITE_UINT16( DIAG_SLDISR , disr );    

//hal_diag_led(0x20);
}

void hal_diag_drain_serial0(void)
{
    CYG_WORD16 disr;
    
    for(;;)
    {
        HAL_READ_UINT16( DIAG_SLDISR , disr );

        if( disr & 0x0002 ) break;
    }

    disr = disr & ~0x0002;
    
    HAL_WRITE_UINT16( DIAG_SLDISR , disr );    
}

void hal_diag_read_char_serial0(char *c)
{
    CYG_WORD16 disr;
    
//hal_diag_led(0x40);        
    for(;;)
    {
        
        HAL_READ_UINT16( DIAG_SLDISR , disr );

        if( disr & 0x0001 ) break;
    }

    disr = disr & ~0x0001;
    
    HAL_READ_UINT8( DIAG_RFIFO, *c );
    
    HAL_WRITE_UINT16( DIAG_SLDISR , disr );    

//hal_diag_led(0x40);
}


#if defined(CYG_KERNEL_DIAG_CYGMON)
void hal_diag_dumb_write_char(char c)
#else
void hal_diag_write_char(char c)
#endif
{
#ifdef CYG_KERNEL_DIAG_GDB    
#if 0 //defined(CYGSEM_HAL_USE_ROM_MONITOR)

    typedef void rom_write_fn(char c);
    rom_write_fn *fn = ((rom_write_fn **)0x80000100)[63];

    fn(c);
    
#else    
    static char line[100];
    static int pos = 0;
//    register volatile cyg_uint16 *volatile tty_status = SERIAL1_SR;    

    // No need to send CRs
    if( c == '\r' ) return;

    line[pos++] = c;

    if( c == '\n' || pos == sizeof(line) )
    {

        // Disable interrupts. This prevents GDB trying to interrupt us
        // while we are in the middle of sending a packet. The serial
        // receive interrupt will be seen when we re-enable interrupts
        // later.
        CYG_INTERRUPT_STATE oldstate;
        HAL_DISABLE_INTERRUPTS(oldstate);
        
        while(1)
        {
            static char hex[] = "0123456789ABCDEF";
            cyg_uint8 csum = 0;
            int i;
            char c1;
        
            hal_diag_write_char_serial0('$');
            hal_diag_write_char_serial0('O');
            csum += 'O';
            for( i = 0; i < pos; i++ )
            {
                char ch = line[i];
                char h = hex[(ch>>4)&0xF];
                char l = hex[ch&0xF];
                hal_diag_write_char_serial0(h);
                hal_diag_write_char_serial0(l);
                csum += h;
                csum += l;
            }
            hal_diag_write_char_serial0('#');
            hal_diag_write_char_serial0(hex[(csum>>4)&0xF]);
            hal_diag_write_char_serial0(hex[csum&0xF]);

            hal_diag_read_char_serial0( &c1 );

            if( c1 == '+' ) break;

            {
                extern void cyg_hal_user_break(CYG_ADDRWORD *regs);
                extern cyg_bool cyg_hal_is_break(char *buf, int size);
                if( cyg_hal_is_break( &c1 , 1 ) )
                    cyg_hal_user_break( NULL );    
            }
            
            break;
        }
        
        pos = 0;

        // Wait for all data from serial line to drain
        // and clear ready-to-send indication.
        hal_diag_drain_serial0();
        
        // And re-enable interrupts
        HAL_RESTORE_INTERRUPTS( oldstate );
        
    }
#endif    
#else
    hal_diag_write_char_serial0(c);
#endif    
}


void hal_diag_read_char(char *c)
{
    for(;;)
    {
#if defined(CYG_KERNEL_DIAG_GDB) && defined(CYGSEM_HAL_USE_ROM_MONITOR)

        typedef void rom_read_fn(char *c);
        rom_read_fn *fn = ((rom_read_fn **)0x80000100)[62];

        fn(c);
    
#else    
        hal_diag_read_char_serial0(c);

#endif    

#if defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS)
        if( *c == 3 )
        {
            // Ctrl-C: breakpoint.
            extern void breakpoint(void);
            breakpoint();
            continue;
        }
#elif defined(CYGSEM_HAL_USE_ROM_MONITOR)
        if( *c == 3 )
        {
            // Ctrl-C: breakpoint.

//                HAL_BREAKPOINT(_breakinst);
            typedef void bpt_fn(void);
            bpt_fn *bfn = ((bpt_fn **)0x80000100)[61];

            bfn();
            continue;            
        }
#endif

        break;      
    }
}

#endif // defined(CYG_KERNEL_DIAG_SERIAL0) || defined(CYG_KERNEL_DIAG_CYGMON)


#if defined(CYG_KERNEL_DIAG_CYGMON) // only

/* This code has been imported from the BSP module. The definitions have
 * been left as-is, even though there was scope for doing more, to avoid
 * too much drift from the original sources
 */

struct bsp_comm_procs {
    void *ch_data;
    void (*__write)(void *ch_data, const char *buf, int len);
    int  (*__read)(void *ch_data, char *buf, int len);
    void (*__putc)(void *ch_data, char ch);
    int  (*__getc)(void *ch_data);
    int  (*__control)(void *ch_data, int func, ...);
};

// This is pointed to by entry BSP_NOTVEC_BSP_COMM_PROCS:
typedef struct {
    int  version;       /* version number for future expansion */
    void *__ictrl_table;
    void *__exc_table;
    void *__dbg_vector;
    void *__kill_vector;
    struct bsp_comm_procs *__console_procs;
    struct bsp_comm_procs *__debug_procs;
    void *__flush_dcache;
    void *__flush_icache;
    void *__cpu_data;
    void *__board_data;
    void *__sysinfo;
    int  (*__set_debug_comm)(int __comm_id);
    int  (*__set_console_comm)(int __comm_id);
    int  (*__set_serial_baud)(int __comm_id, int baud);
    void *__dbg_data;
    void (*__reset)(void);
    int  __console_interrupt_flag;
} bsp_shared_t;

/*
 * Core Exception vectors.