hal_diag.c

Intel XScale PXA255 引导Linux的Redboot 版bootloader源代码！

/*=============================================================================
//
//      hal_diag.c
//
//      HAL diagnostic output code
//
//=============================================================================
//####COPYRIGHTBEGIN####
//                                                                          
// -------------------------------------------                              
// The contents of this file are subject to the Red Hat eCos Public License 
// Version 1.1 (the "License"); you may not use this file except in         
// compliance with the License.  You may obtain a copy of the License at    
// http://www.redhat.com/                                                   
//                                                                          
// Software distributed under the License is distributed on an "AS IS"      
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
// License for the specific language governing rights and limitations under 
// the License.                                                             
//                                                                          
// The Original Code is eCos - Embedded Configurable Operating System,      
// released September 30, 1998.                                             
//                                                                          
// The Initial Developer of the Original Code is Red Hat.                   
// Portions created by Red Hat are                                          
// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
// All Rights Reserved.                                                     
// -------------------------------------------                              
//                                                                          
//####COPYRIGHTEND####
//=============================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):   nickg, gthomas
// Contributors:nickg, gthomas
// Date:        1998-03-02
// Purpose:     HAL diagnostic output
// Description: Implementations of HAL diagnostic output support.
//
//####DESCRIPTIONEND####
//
//===========================================================================*/

#include <pkgconf/hal.h>
#include <pkgconf/system.h>
#include CYGBLD_HAL_PLATFORM_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>           // basic machine info
#include <cyg/hal/hal_intr.h>           // interrupt macros
#include <cyg/hal/hal_io.h>             // IO macros
#include <cyg/hal/hal_if.h>             // calling interface API
#include <cyg/hal/hal_misc.h>           // helper functions
#include <cyg/hal/hal_diag.h>
#include <cyg/hal/hal_sa110.h>          // Hardware definitions
#include <cyg/hal/drv_api.h>            // cyg_drv_interrupt_acknowledge

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

struct sa110_serial {
  volatile cyg_uint32 data_register;
  volatile cyg_uint32 rxstat;
  volatile cyg_uint32 h_baud_control;
  volatile cyg_uint32 m_baud_control;
  volatile cyg_uint32 l_baud_control;
  volatile cyg_uint32 control_register;
  volatile cyg_uint32 flag_register;
};

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

static void
init_channel(void* __ch_data)
{
    volatile struct sa110_serial* base = (struct sa110_serial*)__ch_data;

    int dummy;
    /*
     * Make sure everything is off
     */
    base->control_register = SA110_UART_DISABLED | SA110_SIR_DISABLED;
    
    /*
     * Read the RXStat to drain the fifo
     */
    dummy = base->rxstat;

    /*
     * Set the baud rate - this also turns the uart on.
     *
     * Note that the ordering of these writes is critical,
     * and the writes to the H_BAUD_CONTROL and CONTROL_REGISTER
     * are necessary to force the UART to update its register
     * contents.
     */
    base->l_baud_control   = 0x13; // bp->divisor_low;
    base->m_baud_control   = 0x00; // bp->divisor_high;
    base->h_baud_control = SA110_UART_BREAK_DISABLED    |
        SA110_UART_PARITY_DISABLED   |
        SA110_UART_STOP_BITS_ONE     |
        SA110_UART_FIFO_ENABLED      |
        SA110_UART_DATA_LENGTH_8_BITS;
    base->control_register = SA110_UART_ENABLED | SA110_SIR_DISABLED;
    // All done
}

void
cyg_hal_plf_serial_putc(void *__ch_data, char c)
{
    volatile struct sa110_serial* base = (struct sa110_serial*)__ch_data;
    CYGARC_HAL_SAVE_GP();

    // Wait for Tx FIFO not full
    while ((base->flag_register & SA110_TX_FIFO_STATUS_MASK) == SA110_TX_FIFO_BUSY)
        ;
    base->data_register = c;

    CYGARC_HAL_RESTORE_GP();
}


static cyg_bool
cyg_hal_plf_serial_getc_nonblock(void* __ch_data, cyg_uint8* ch)
{
    volatile struct sa110_serial* base = (struct sa110_serial*)__ch_data;

    if ((base->flag_register & SA110_RX_FIFO_STATUS_MASK) == SA110_RX_FIFO_EMPTY)
        return false;

    *ch = (char)(base->data_register & 0xFF);

    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;
}

#if defined(CYGSEM_HAL_VIRTUAL_VECTOR_DIAG) \
    || defined(CYGPRI_HAL_IMPLEMENTS_IF_SERVICES)

static cyg_int32 msec_timeout;

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)
{
    int delay_count;
    cyg_bool res;
    CYGARC_HAL_SAVE_GP();

    delay_count = 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, ...)
{
    static int irq_state = 0;
    int ret = 0;
    CYGARC_HAL_SAVE_GP();

    switch (__func) {
    case __COMMCTL_IRQ_ENABLE:
        irq_state = 1;

        HAL_INTERRUPT_UNMASK(CYGNUM_HAL_INTERRUPT_SERIAL_RX);
        break;
    case __COMMCTL_IRQ_DISABLE:
        ret = irq_state;
        irq_state = 0;

        HAL_INTERRUPT_MASK(CYGNUM_HAL_INTERRUPT_SERIAL_RX);
        break;
    case __COMMCTL_DBG_ISR_VECTOR:
        ret = CYGNUM_HAL_INTERRUPT_SERIAL_RX;
        break;
    case __COMMCTL_SET_TIMEOUT:
    {
        va_list ap;

        va_start(ap, __func);

        ret = msec_timeout;
        msec_timeout = va_arg(ap, cyg_uint32);

        va_end(ap);
    }        
    default:
        break;
    }
    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 reg, res = 0;
    volatile struct sa110_serial* base = (struct sa110_serial*)__ch_data;
    char c;
    CYGARC_HAL_SAVE_GP();

    if ( CYGNUM_HAL_INTERRUPT_SERIAL_RX == __vector ) {
        reg = base->flag_register;
        // read it anyway just in case - no harm done and we might
        // prevent an interrup loop
        c = (char)(base->data_register & 0xFF);

        cyg_drv_interrupt_acknowledge(CYGNUM_HAL_INTERRUPT_SERIAL_RX);
        *__ctrlc = 0;
        if ( (reg & SA110_RX_FIFO_STATUS_MASK) != SA110_RX_FIFO_EMPTY ) {
            if( cyg_hal_is_break( &c , 1 ) )
                *__ctrlc = 1;
            
        }
        res = CYG_ISR_HANDLED;
    }

    CYGARC_HAL_RESTORE_GP();
    return res;
}