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):    Bob Koninckx
// Contributors: Bob Koninckx
// Date:         2001-12-11
// Purpose:      HAL diagnostic output
// Description:  Implementations of HAL diagnostic output support.
//
//####DESCRIPTIONEND####
//
//=============================================================================

#include <pkgconf/hal.h>

#include <cyg/hal/hal_diag.h>           // our header.

#include <cyg/infra/cyg_type.h>         // base types, externC
#include <cyg/hal/drv_api.h>            // CYG_ISR_HANDLED
#include <cyg/hal/hal_misc.h>           // Helper functions
#include <cyg/hal/hal_io.h>             // IO macros
#include <cyg/hal/hal_intr.h>           // Interrupt macros

#include <cyg/hal/hal_arch.h>           // SAVE/RESTORE GP
#include <cyg/hal/hal_if.h>             // Calling-if API


static void cyg_hal_plf_serial_init(void);

void
cyg_hal_plf_comms_init(void)
{
    static int initialized = 0;

    if (initialized)
        return;

    initialized = 1;

    cyg_hal_plf_serial_init();
}

//=============================================================================
// Serial driver
//=============================================================================

//-----------------------------------------------------------------------------
// There are two serial ports.
#define CYG_DEV_SERIAL_BASE_A    0x305008 // SCI0
#define CYG_DEV_SERIAL_BASE_B    0x305020 // SCI1

//-----------------------------------------------------------------------------
// Define CYG_DEVICE_SERIAL_RS232_SCIBR
// Default baudrate is 38400
// These values are calculated for a 40Mhz clock frequency
// This should be enough, we did not provide clock frequency as a configuration 
// option anyway
#define CYG_DEV_SERIAL_RS232_SCxBR_300    4167
#define CYG_DEV_SERIAL_RS232_SCxBR_600    2083
#define CYG_DEV_SERIAL_RS232_SCxBR_1200   1042
#define CYG_DEV_SERIAL_RS232_SCxBR_2400    521
#define CYG_DEV_SERIAL_RS232_SCxBR_4800    260
#define CYG_DEV_SERIAL_RS232_SCxBR_9600    130 
#define CYG_DEV_SERIAL_RS232_SCxBR_14400    87
#define CYG_DEV_SERIAL_RS232_SCxBR_19200    65
#define CYG_DEV_SERIAL_RS232_SCxBR_28800    43
#define CYG_DEV_SERIAL_RS232_SCxBR_38400    33
#define CYG_DEV_SERIAL_RS232_SCxBR_57600    22
#define CYG_DEV_SERIAL_RS232_SCxBR_115200   11

//-----------------------------------------------------------------------------
// Define the serial registers.
#define CYG_DEV_SERIAL_RS232_SCCR0 0x00
#define CYG_DEV_SERIAL_RS232_SCCR1 0x01
#define CYG_DEV_SERIAL_RS232_SCSR  0x02
#define CYG_DEV_SERIAL_RS232_SCDR  0x03

#define SCCR0_OTHR   0x8000 // Select baud rate other than system clock
#define SCCR0_LINKBD 0x4000 // Link baud
#define SCCR0_SCxBR  0x1fff // SCI baud rate

#define SCCR1_LOOPS  0x4000 // Loop mode
#define SCCR1_WOMS   0x2000 // Wired or for SCI pins
#define SCCR1_ILT    0x1000 // Idle line detect type
#define SCCR1_PT     0x0800 // Parity type (0 = Odd, 1 = Even)
#define SCCR1_PE     0x0400 // Parity enable
#define SCCR1_M      0x0200 // Mode select (0 = 10 bit frame, 1 = 11 bit frame)
#define SCCR1_WAKE   0x0100 // Wakeup by address mark
#define SCCR1_TIE    0x0080 // Transmit interrupt enable
#define SCCR1_TCIE   0x0040 // Transmit complete interrupt enable
#define SCCR1_RIE    0x0020 // Receiver interrupt enable
#define SCCR1_ILIE   0x0010 // Idle line interrupt enable
#define SCCR1_TE     0x0008 // Transmiter enable
#define SCCR1_RE     0x0004 // Receiver enable
#define SCCR1_RWU    0x0002 // Receiver wakeup
#define SCCR1_SBK    0x0001 // Send break

#define SCSR_TDRE    0x0100 // Transmit data register empty
#define SCSR_TC      0x0080 // Transmit complete
#define SCSR_RDRF    0x0040 // Receive data register full
#define SCSR_RAF     0x0020 // Receive active flag
#define SCSR_IDLE    0x0010 // Idle line detected
#define SCSR_OR      0x0008 // Overrun error
#define SCSR_NF      0x0004 // Noise error flag
#define SCSR_FE      0x0002 // Framing error
#define SCSR_PF      0x0001 // Parity error

//-----------------------------------------------------------------------------
typedef struct {
    cyg_uint16*  base;                // Base address of the register set
    cyg_int32    msec_timeout;        // How long do we wait
    int          imb3_vector;         // The vector on the IMB3. No need to worry
                                      // about SIU levels or vectors, that's the
                                      // responsibility of the application
	int          baud_rate;
} channel_data_t;

//-----------------------------------------------------------------------------
static void
init_serial_channel(const channel_data_t* __ch_data)
{
    cyg_uint16 * base = __ch_data->base;
    cyg_uint16 br;
    
    switch(__ch_data->baud_rate)
    {
    case 300:
        br = CYG_DEV_SERIAL_RS232_SCxBR_300;
	    break;
    case 600:
        br = CYG_DEV_SERIAL_RS232_SCxBR_600;
        break;
    case 1200:
        br = CYG_DEV_SERIAL_RS232_SCxBR_1200;
        break;
    case 2400:
        br = CYG_DEV_SERIAL_RS232_SCxBR_2400;
        break;
    case 4800:
        br = CYG_DEV_SERIAL_RS232_SCxBR_4800;
        break;
    case 9600:
        br = CYG_DEV_SERIAL_RS232_SCxBR_9600;
        break;
    case 14400:
        br = CYG_DEV_SERIAL_RS232_SCxBR_14400;
        break;
    case 19200:
        br = CYG_DEV_SERIAL_RS232_SCxBR_19200;
        break;
    case 28800:
        br = CYG_DEV_SERIAL_RS232_SCxBR_28800;
        break;
    case 38400:
        br = CYG_DEV_SERIAL_RS232_SCxBR_38400;
        break;
    case 57600:
        br = CYG_DEV_SERIAL_RS232_SCxBR_57600;
        break;
    case 115200:
        br = CYG_DEV_SERIAL_RS232_SCxBR_115200;
        break;
    default:
        // Use the default if something unknown is requested
        br = CYG_DEV_SERIAL_RS232_SCxBR_38400;
        break;
    }
    
    // 8-1-No parity, enable transmitter and receiver, leave interrupts
	// as they are
    HAL_WRITE_UINT16(base+CYG_DEV_SERIAL_RS232_SCCR1, (SCCR1_TE | SCCR1_RE));
       
    // Set baud rate
    HAL_WRITE_UINT16(base+CYG_DEV_SERIAL_RS232_SCCR0, br);
}

static cyg_bool
cyg_hal_plf_serial_getc_nonblock(void* __ch_data, cyg_uint8* ch)
{
    cyg_uint16 status;
    cyg_uint16 result;
    cyg_uint16 * base = ((channel_data_t *)__ch_data)->base;

    HAL_READ_UINT16(base+CYG_DEV_SERIAL_RS232_SCSR, status);
    if((status & SCSR_RDRF) == 0)
        return false;

    HAL_READ_UINT16(base+CYG_DEV_SERIAL_RS232_SCDR, result);
    *ch = (cyg_uint8)(result & 0x00ff);

    return true;
}


cyg_uint8
cyg_hal_plf_serial_getc(void* __ch_data)
{
    cyg_uint8 ch;
    CYGARC_HAL_SAVE_GP();

    while(!cyg_hal_plf_serial_getc_nonblock(__ch_data, &ch));

    CYGARC_HAL_RESTORE_GP();
    return ch;
}

void
cyg_hal_plf_serial_putc(void* __ch_data, cyg_uint8 c)
{
    cyg_uint16 status;
    cyg_uint16 * base = ((channel_data_t *)__ch_data)->base;

    CYGARC_HAL_SAVE_GP();
    
    do {
       HAL_READ_UINT16(base+CYG_DEV_SERIAL_RS232_SCSR, status);
    } while((status & SCSR_TDRE) == 0);

    HAL_WRITE_UINT16(base+CYG_DEV_SERIAL_RS232_SCDR, (short)c);

    // Hang around until the character is safely sent
    do {
       HAL_READ_UINT16(base+CYG_DEV_SERIAL_RS232_SCSR, status);
    } while((status & SCSR_TDRE) == 0);
         
    CYGARC_HAL_RESTORE_GP();
}

// Channel data
// Do NOT make them const, will cause problems when trying
// to change the timeout parameter ... (Is this a bug in other)
// PowerPC platform hals ?? You only see it when you really start from
// flash ....
static channel_data_t channels[2] = {
    { (cyg_uint16*)CYG_DEV_SERIAL_BASE_A, 
      1000,
      CYGNUM_HAL_INTERRUPT_IMB3_SCI0_RX,
      CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD },
    { (cyg_uint16*)CYG_DEV_SERIAL_BASE_B, 
      1000, 
      CYGNUM_HAL_INTERRUPT_IMB3_SCI1_RX,
      CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD }
};

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();
}

cyg_bool
cyg_hal_plf_serial_getc_timeout(void* __ch_data, cyg_uint8* ch)
{