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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 Free Software Foundation, 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.,

// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 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 v2.

//

// This exception does not invalidate any other reasons why a work based

// on this file might be covered by the GNU General Public 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/system.h>

#include <pkgconf/hal.h>

#include <pkgconf/hal_sparclite.h>

#include <pkgconf/hal_sparclite_sleb.h>

#include <cyg/infra/cyg_type.h>          // base types

#include <cyg/hal/hal_arch.h>

#include <cyg/hal/hal_diag.h>

#include <cyg/hal/hal_intr.h>

#include <cyg/hal/hal_cygm.h>

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

#ifdef CYG_KERNEL_DIAG_GDB

#ifdef CYG_KERNEL_DIAG_GDB_SERIAL_DIRECT // then force $O packets to serial

void hal_diag_init(void)

{

    // hal_diag_init_serial();

}

void hal_diag_write_char_serial( char c )

{

    HAL_REORDER_BARRIER();

    HAL_DIAG_WRITE_CHAR_DIRECT( c );

    HAL_REORDER_BARRIER();

    HAL_DIAG_WRITE_CHAR_WAIT_FOR_EMPTY();

    HAL_REORDER_BARRIER();

}

void hal_diag_write_char(char c)

{

    static char line[100];

    static int pos = 0;

    // No need to send CRs

    if( c == '\r' ) return;

    line[pos++] = c;

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

    {

        CYG_INTERRUPT_STATE old;

        // 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.

        HAL_DISABLE_INTERRUPTS(old);

        while(1)

        {

            cyg_uint32 status, c1, tries;

            static char hex[] = "0123456789ABCDEF";

            cyg_uint8 csum = 0;

            int i;

            hal_diag_write_char_serial('$');

            hal_diag_write_char_serial('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_serial(h);

                hal_diag_write_char_serial(l);

                csum += h;

                csum += l;

            }

            hal_diag_write_char_serial('#');

            hal_diag_write_char_serial(hex[(csum>>4)&0xF]);

            hal_diag_write_char_serial(hex[csum&0xF]);

            // Wait for the ACK character '+' from GDB here and handle

            // receiving a ^C instead.  This is the reason for this clause

            // being a loop.

            status = 0;

            tries = 1000000000;

            while ( 0 == (HAL_SPARC_86940_FLAG_RXRDY & status) ) {

                if ( 0 == --tries )

                    break;

                HAL_SPARC_86940_SDTR0_STAT_READ( status );

            }

            if ( 0 == tries )       // then we broke out after waiting

                continue;           // the outer loop, send the packet

            HAL_SPARC_86940_SDTR0_RXDATA_READ( c1 );

            // We must ack the interrupt caused by that read to avoid

            // confusing the GDB stub ROM.

            HAL_INTERRUPT_ACKNOWLEDGE( CYGNUM_HAL_VECTOR_INTERRUPT_10 );

            if( c1 == '+' )

                break;              // a good acknowledge

            if( c1 == 3 ) {

                // Ctrl-C: breakpoint.

                asm volatile( "ta 2; nop; nop; nop" );

                break;

            }

            // otherwise, loop round again

        }

        pos = 0;

        // And re-enable interrupts

        HAL_RESTORE_INTERRUPTS(old);

    }

}

#else // CYG_KERNEL_DIAG_GDB_SERIAL_DIRECT not defined; use CygMon

// All this code provided by MSalter - ta.

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);

    void *__set_console_comm;

} bsp_shared_t;

static int

hal_bsp_set_debug_comm(int arg)

{

    bsp_shared_t *shared;

    shared = (bsp_shared_t *)

        (CYGMON_VECTOR_TABLE[ BSP_NOTVEC_BSP_COMM_PROCS ]);

    if (0 != shared->__set_debug_comm) {

        return (*(shared->__set_debug_comm))(arg);

    }

    return 0;

}

static int

hal_bsp_console_write(const char *p, int len)

{

    bsp_shared_t *shared;

    struct bsp_comm_procs *com;

    shared = (bsp_shared_t *)

        (CYGMON_VECTOR_TABLE[ BSP_NOTVEC_BSP_COMM_PROCS ]);

    com = shared->__console_procs;

    if (0 != com) {

        com->__write(com->ch_data, p, len);

#if 1

        // FIXME: This is a workaround for PR 19926; CygMon does not

        // expect to be sharing the line with a serial driver (which

        // can be excused :) and so doesn't acknowledge the interrupt.

        // In normal circumstances CygMon would handle the resulting

        // interrupt and do the right thing.  However, when using the

        // serial driver it is handling the interrupts and gets

        // mightily confused by these spurious interrupts.

        //

        // As a workaround, ask CygMon which communication port is

        // using for console output. If this is the serial port 

        // (comm 0), acknowledge the interrupt.

        if ( 0 == hal_bsp_set_debug_comm( -1 ) )

            HAL_INTERRUPT_ACKNOWLEDGE( CYGNUM_HAL_VECTOR_INTERRUPT_10 );

#endif

        return 1;

    }

    return 0;

}

static void

hal_dumb_serial_write(const char *p, int len)

{

    int i;

    for ( i = 0 ; i < len; i++ ) {

        HAL_DIAG_WRITE_CHAR_DIRECT( p[ i ] );

    }

}

void hal_diag_init(void)

{

}

void hal_diag_write_char(char c)

{

    static char line[100];

    static int pos = 0;

    // No need to send CRs

    if( c == '\r' ) return;

    line[pos++] = c;

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

        CYG_INTERRUPT_STATE old;

        // 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.

        HAL_DISABLE_INTERRUPTS(old);

        if ( ! hal_bsp_console_write( line, pos ) )

            // then there is no function registered, just spew it out serial

            hal_dumb_serial_write( line, pos );

        pos = 0;

        // And re-enable interrupts

        HAL_RESTORE_INTERRUPTS(old);

    }

}

#endif  // CYG_KERNEL_DIAG_GDB_SERIAL_DIRECT not defined; use CygMon

#else // CYG_KERNEL_DIAG_GDB not defined, so we are going to the serial line

      // without GDB encoding - likely to be ROM startup.

/* Address of clock switch */

#define CLKSW_ADDR  0x01000003

/* Address of SW1 */

#define SW1_ADDR  0x02000003

void hal_diag_init(void)

{

    cyg_uint32 clk, tval;

    // first set the baud rate

    clk = *(unsigned char *)CLKSW_ADDR;

    if (clk & 0x80)

        clk = 10;

    clk = (clk & 0x3f) * 1000000;  /* in MHz */

    tval = clk / 19200;

    tval /= 32;

    tval -= 1;

    HAL_SPARC_86940_TCR3_WRITE(

        HAL_SPARC_86940_TCR_CE          |

        HAL_SPARC_86940_TCR_CLKINT      |

        HAL_SPARC_86940_TCR_OUTC3       |

        HAL_SPARC_86940_TCR_SQWAVE           );

    HAL_SPARC_86940_RELOAD3_WRITE( tval);

#define DELAY(x) \

    CYG_MACRO_START int i; for (i = 0; i < x; i++); CYG_MACRO_END

    HAL_SPARC_86940_SDTR0_CTRL_WRITE( 0 );

    DELAY(100);

    HAL_SPARC_86940_SDTR0_CTRL_WRITE( 0 );

    DELAY(100);

    HAL_SPARC_86940_SDTR0_CTRL_WRITE( 0 );

    DELAY(100);

    HAL_SPARC_86940_SDTR0_CTRL_WRITE( HAL_SPARC_86940_SER_CMD_IRST );

    DELAY(100);

    /* first write after reset is to mode register */

    HAL_SPARC_86940_SDTR0_CTRL_WRITE( HAL_SPARC_86940_SER_DIV16_CLK     |

                                      HAL_SPARC_86940_SER_8BITS         |

                                      HAL_SPARC_86940_SER_NO_PARITY     |

                                      HAL_SPARC_86940_SER_STOP1           );

    DELAY(100);

    /* subsequent writes are to command register */

    HAL_SPARC_86940_SDTR0_CTRL_WRITE( HAL_SPARC_86940_SER_CMD_RTS       |

                                      HAL_SPARC_86940_SER_CMD_DTR       |

                                      HAL_SPARC_86940_SER_CMD_EFR       |

                                      HAL_SPARC_86940_SER_CMD_RXEN      |

                                      HAL_SPARC_86940_SER_CMD_TXEN        );

    DELAY(100);

}

#endif // CYG_KERNEL_DIAG_GDB

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

/* End of hal_diag.c */