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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):   hmt, nickg

// Contributors:        nickg

// Date:        2001-05-25

// 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>           // which includes var_arch => UART.

#include <cyg/hal/hal_diag.h>

#include <cyg/hal/hal_intr.h>

#include <cyg/hal/hal_io.h>

#include <cyg/hal/drv_api.h>

#include <cyg/hal/hal_if.h>             // interface API

#include <cyg/hal/hal_misc.h>           // Helper functions

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

//#define CYG_KERNEL_DIAG_GDB

#if defined(CYGSEM_HAL_USE_ROM_MONITOR_GDB_stubs)

#define CYG_KERNEL_DIAG_GDB

#endif

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

static inline

void hal_uart_setbaud( int baud )

{

    // now set the baud rate

    *UARTLCR |= UARTLCR_DLAB;

    *UARTDLM = UARTDLM_VAL( baud );

    *UARTDLL = UARTDLL_VAL( baud );

    *UARTLCR &=~UARTLCR_DLAB;

}

void hal_uart_init(void)

{

    // Ensure that we use the internal clock

    *S_GMR &=~S_GMR_UCSEL;

    *UARTFCR = UARTFCR_16550_MODE;

    *UARTLCR = UARTLCR_8N1;

    *UARTIER = UARTIER_ERBFI;           // rx interrupts enabled for CTRL-C

    hal_uart_setbaud( CYGHWR_HAL_MIPS_UPD985XX_DIAG_BAUD );

}

void hal_uart_write_char(char c)

{

    while ( 0 == (UARTLSR_THRE & *UARTLSR) )

        /* do nothing */ ;

    *UARTTHR = (unsigned int)c;

    // Ensure that this write does not provoke a spurious interrupt.

    HAL_INTERRUPT_ACKNOWLEDGE( CYGHWR_HAL_GDB_PORT_VECTOR );

}

void hal_uart_read_char(char *c)

{

    while ( 0 == (UARTLSR_DR & *UARTLSR) )

        /* do nothing */ ;

    *c = (char)*UARTRBR;

    // Ensure that this read does not provoke a spurious interrupt.

    HAL_INTERRUPT_ACKNOWLEDGE( CYGHWR_HAL_GDB_PORT_VECTOR );

}

int hal_uart_read_char_nonblock(char *c)

{

    if ( 0 == (UARTLSR_DR & *UARTLSR) )

        return 0;

    *c = (char)*UARTRBR;

    // Ensure that this read does not provoke a spurious interrupt.

    HAL_INTERRUPT_ACKNOWLEDGE( CYGHWR_HAL_GDB_PORT_VECTOR );

    return 1;

}

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

#ifdef CYGSEM_HAL_VIRTUAL_VECTOR_DIAG

#include <cyg/hal/hal_if.h>

// This is lame, duplicating all these wrappers with slightly different details.

// All this should be in hal_if.c

static void

cyg_hal_plf_serial_putc(void* __ch_data, cyg_uint8 c)

{

    CYGARC_HAL_SAVE_GP();

    hal_uart_write_char( (char)c );

    CYGARC_HAL_RESTORE_GP();

}

static cyg_uint8

cyg_hal_plf_serial_getc(void* __ch_data)

{

    cyg_uint8 result;

    CYGARC_HAL_SAVE_GP();

    hal_uart_read_char( (char *)&result );

    CYGARC_HAL_RESTORE_GP();

    return result;

}

static int

cyg_hal_plf_serial_getc_nonblock(void* __ch_data, cyg_uint8 *pc)

{

    return hal_uart_read_char_nonblock( (char *)pc );

}

static void

cyg_hal_plf_serial_write(void* __ch_data, const cyg_uint8* __buf,

                         cyg_uint32 __len)

{

    CYGARC_HAL_SAVE_GP();

    while(__len-- > 0)

        cyg_hal_plf_serial_putc(__ch_data, *__buf++);

    CYGARC_HAL_RESTORE_GP();

}

static void

cyg_hal_plf_serial_read(void* __ch_data, cyg_uint8* __buf, cyg_uint32 __len)

{

    CYGARC_HAL_SAVE_GP();

    while(__len-- > 0)

        *__buf++ = cyg_hal_plf_serial_getc(__ch_data);

    CYGARC_HAL_RESTORE_GP();

}

static int chan__msec_timeout = 0;

static int chan__irq_state = 0;

static int chan__baud_rate = CYGHWR_HAL_MIPS_UPD985XX_DIAG_BAUD;

cyg_bool

cyg_hal_plf_serial_getc_timeout(void* __ch_data, cyg_uint8* ch)

{

    int delay_count;

    cyg_bool res;

    CYGARC_HAL_SAVE_GP();

    delay_count = chan__msec_timeout * 10; // delay in .1 ms steps

    for(;;) {

        res = cyg_hal_plf_serial_getc_nonblock(__ch_data, ch);

        if (res || 0 >= delay_count--)

            break;

        CYGACC_CALL_IF_DELAY_US(100);

    }

    CYGARC_HAL_RESTORE_GP();

    return res;

}

static int

cyg_hal_plf_serial_control(void *__ch_data, __comm_control_cmd_t __func, ...)

{

    int ret = -1;

    va_list ap;

    CYGARC_HAL_SAVE_GP();

    va_start(ap, __func);

    switch (__func) {

    case __COMMCTL_GETBAUD:

        ret = chan__baud_rate;

        break;

    case __COMMCTL_SETBAUD:

        ret = 0;

        chan__baud_rate = va_arg(ap, cyg_int32);

        hal_uart_setbaud( chan__baud_rate );

        break;

    case __COMMCTL_IRQ_ENABLE:

        ret = chan__irq_state;

        chan__irq_state = 1;

        HAL_INTERRUPT_UNMASK( CYGHWR_HAL_GDB_PORT_VECTOR );

        break;

    case __COMMCTL_IRQ_DISABLE:

        ret = chan__irq_state;

        chan__irq_state = 0;

        HAL_INTERRUPT_MASK( CYGHWR_HAL_GDB_PORT_VECTOR );

        break;

    case __COMMCTL_DBG_ISR_VECTOR:

        ret = CYGHWR_HAL_GDB_PORT_VECTOR;

        break;

    case __COMMCTL_SET_TIMEOUT:

        ret = chan__msec_timeout;

        chan__msec_timeout = va_arg(ap, cyg_uint32);

        break;

    default:

        break;

    }

    va_end(ap);

    CYGARC_HAL_RESTORE_GP();

    return ret;

}

static int

cyg_hal_plf_serial_isr(void *__ch_data, int* __ctrlc,

                       CYG_ADDRWORD __vector, CYG_ADDRWORD __data)

{

    int ret = 0;

    char c;

    *__ctrlc = 0;

    if ( hal_uart_read_char_nonblock( &c ) ) {

        if ( cyg_hal_is_break( &c , 1 ) )

            *__ctrlc = 1;

        ret = CYG_ISR_HANDLED;

    }

    return ret;

}

static void

cyg_hal_plf_serial_init(void)

{

    hal_virtual_comm_table_t* comm;

    int cur = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);

    // Init channels

    CYGACC_CALL_IF_SET_CONSOLE_COMM(0);

    comm = CYGACC_CALL_IF_CONSOLE_PROCS();

    CYGACC_COMM_IF_CH_DATA_SET(*comm, comm);

    CYGACC_COMM_IF_WRITE_SET(*comm, cyg_hal_plf_serial_write);

    CYGACC_COMM_IF_READ_SET(*comm, cyg_hal_plf_serial_read);

    CYGACC_COMM_IF_PUTC_SET(*comm, cyg_hal_plf_serial_putc);

    CYGACC_COMM_IF_GETC_SET(*comm, cyg_hal_plf_serial_getc);

    CYGACC_COMM_IF_CONTROL_SET(*comm, cyg_hal_plf_serial_control);

    CYGACC_COMM_IF_DBG_ISR_SET(*comm, cyg_hal_plf_serial_isr);

    CYGACC_COMM_IF_GETC_TIMEOUT_SET(*comm, cyg_hal_plf_serial_getc_timeout);

    // Restore original console

    CYGACC_CALL_IF_SET_CONSOLE_COMM(cur);

}

void

cyg_hal_plf_comms_init(void)

{

    static int initialized = 0;

    if (initialized)

        return;

    initialized = 1;

    hal_uart_init();

    cyg_hal_plf_serial_init();

}

#endif // CYGSEM_HAL_VIRTUAL_VECTOR_DIAG

// ------------------------------------------------------------------------

void hal_diag_init(void)

{

    hal_uart_init();

}

void hal_diag_read_char(char *c)

{

    hal_uart_read_char(c);

}

extern cyg_bool cyg_hal_is_break(char *buf, int size);

extern void cyg_hal_user_break(CYG_ADDRWORD *regs);

void hal_diag_write_char(char c)

{

#ifdef CYG_KERNEL_DIAG_GDB    

    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) )

    {

        // 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_uart_write_char('$');

            hal_uart_write_char('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_uart_write_char(h);

                hal_uart_write_char(l);

                csum += h;

                csum += l;

            }

            hal_uart_write_char('#');

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

            hal_uart_write_char(hex[csum&0xF]);

            hal_uart_read_char( &c1 );

            if( c1 == '+' ) break;

            if( cyg_hal_is_break( &c1 , 1 ) )

                cyg_hal_user_break( NULL );

        }

        pos = 0;

        // Disabling the interrupts for an extended period of time

        // can provoke a spurious interrupt.

        // Ensure that this write does not provoke a spurious interrupt.

        HAL_INTERRUPT_ACKNOWLEDGE( CYGHWR_HAL_GDB_PORT_VECTOR );

        // And re-enable interrupts

        HAL_RESTORE_INTERRUPTS( oldstate );

    }

#else

    hal_uart_write_char(c);

#endif    

}

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

/* End of hal_diag.c */