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):   gthomas
// Contributors:nickg, gthomas, dmoseley
//              Travis C. Furrer <[e-mail]>
// Date:        2000-05-08
// 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 definitions
#include <cyg/hal/hal_diag.h>
#include <cyg/hal/drv_api.h>            // cyg_drv_interrupt_acknowledge
#include <cyg/hal/hal_misc.h>           // Helper functions
#include <cyg/hal/hal_sa11x0.h>         // Hardware definitions

struct sa11x0_serial {
  volatile cyg_uint32 utcr0;
  volatile cyg_uint32 utcr1;
  volatile cyg_uint32 utcr2;
  volatile cyg_uint32 utcr3;
  volatile cyg_uint32 pad0010;
  volatile cyg_uint32 utdr;
  volatile cyg_uint32 pad0018;
  volatile cyg_uint32 utsr0;
  volatile cyg_uint32 utsr1;
};

//-----------------------------------------------------------------------------
typedef struct {
    volatile struct sa11x0_serial* base;
    cyg_int32 msec_timeout;
    int isr_vector;
    int baud_rate;
} channel_data_t;

/*---------------------------------------------------------------------------*/
// SA11x0 Serial Port (UARTx) for Debug

static void
init_channel(channel_data_t* __ch_data)
{
    volatile struct sa11x0_serial* base = __ch_data->base;
    cyg_uint32 brd;

    // Disable Receiver and Transmitter (clears FIFOs)
    base->utcr3 = SA11X0_UART_RX_DISABLED | SA11X0_UART_TX_DISABLED;

    // Clear sticky (writable) status bits.
    base->utsr0 = SA11X0_UART_RX_IDLE | SA11X0_UART_RX_BEGIN_OF_BREAK |
                  SA11X0_UART_RX_END_OF_BREAK;

#if defined(CYGPKG_HAL_ARM_SA11X0_SA1100MM) || defined(CYGPKG_HAL_ARM_SA11X0_BRUTUS)
   // This setup is specific to only a few boards.
   if (SA11X0_UART1_BASE == (volatile unsigned long *)base) {
        cyg_uint32 pdr, afr, par;

        HAL_READ_UINT32(SA11X0_GPIO_PIN_DIRECTION, pdr);
        HAL_READ_UINT32(SA11X0_GPIO_ALTERNATE_FUNCTION, afr);
        HAL_READ_UINT32(SA11X0_PPC_PIN_ASSIGNMENT, par);

        //Set pin 14 as an output (Tx) and pin 15 as in input (Rx).
        HAL_WRITE_UINT32(SA11X0_GPIO_PIN_DIRECTION, ((pdr | SA11X0_GPIO_PIN_14) & ~SA11X0_GPIO_PIN_15));

        // Use GPIO 14 & 15 pins for serial port 1.
        HAL_WRITE_UINT32(SA11X0_GPIO_ALTERNATE_FUNCTION, afr | SA11X0_GPIO_PIN_14 | SA11X0_GPIO_PIN_15);

        // Pin reassignment for serial port 1.
        HAL_WRITE_UINT32(SA11X0_PPC_PIN_ASSIGNMENT, par | SA11X0_PPC_UART_PIN_REASSIGNMENT_MASK);
    }
#endif

    // Set UART to 8N1 (8 data bits, no partity, 1 stop bit)
    base->utcr0 = SA11X0_UART_PARITY_DISABLED | SA11X0_UART_STOP_BITS_1 |
                  SA11X0_UART_DATA_BITS_8;

    // Set the desired baud rate.
    brd = SA11X0_UART_BAUD_RATE_DIVISOR(__ch_data->baud_rate);
    base->utcr1 = (brd >> 8) & SA11X0_UART_H_BAUD_RATE_DIVISOR_MASK;
    base->utcr2 = brd & SA11X0_UART_L_BAUD_RATE_DIVISOR_MASK;

    // Enable the receiver and the transmitter.
    base->utcr3 = SA11X0_UART_RX_ENABLED | SA11X0_UART_TX_ENABLED;

    // All done
}

void
cyg_hal_plf_serial_putc(void *__ch_data, char c)
{
    volatile struct sa11x0_serial* base = ((channel_data_t*)__ch_data)->base;
    CYGARC_HAL_SAVE_GP();

    // Wait for Tx FIFO not full
    while ((base->utsr1 & SA11X0_UART_TX_FIFO_NOT_FULL) == 0)
        ;
    base->utdr = c;

    CYGARC_HAL_RESTORE_GP();
}

// FIXME: shouldn't we check for PARITY_ERROR, FRAMING_ERROR, or
// RECEIVE_FIFO_OVERRUN_ERROR in the received data?  This
// means check the appropriate bits in UTSR1.

static cyg_bool
cyg_hal_plf_serial_getc_nonblock(void* __ch_data, cyg_uint8* ch)
{
    volatile struct sa11x0_serial* base = ((channel_data_t*)__ch_data)->base;

    // If receive fifo is empty, return false
    if ((base->utsr1 & SA11X0_UART_RX_FIFO_NOT_EMPTY) == 0)
        return false;

    *ch = (char)base->utdr;

    // Clear receiver idle status bit, to allow another interrupt to
    // occur in the case where the receive fifo is almost empty.
    base->utsr0 = SA11X0_UART_RX_IDLE;

    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;
}

static channel_data_t ser_channels[] = {
#if CYGHWR_HAL_ARM_SA11X0_UART1 != 0
    { (volatile struct sa11x0_serial*)SA11X0_UART1_BASE, 1000, 
      CYGNUM_HAL_INTERRUPT_UART1, CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD },
#endif
#if CYGHWR_HAL_ARM_SA11X0_UART3 != 0
    { (volatile struct sa11x0_serial*)SA11X0_UART3_BASE, 1000, 
      CYGNUM_HAL_INTERRUPT_UART3, CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD },
#endif
};

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;
    channel_data_t* chan = (channel_data_t*)__ch_data;
    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, ...)
{
    static int irq_state = 0;
    channel_data_t* chan = (channel_data_t*)__ch_data;
    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:
        chan->baud_rate = va_arg(ap, cyg_int32);
        // Should we verify this value here?
        init_channel(chan);
        ret = 0;
        break;
    case __COMMCTL_IRQ_ENABLE:
        irq_state = 1;

        chan->base->utcr3 |= SA11X0_UART_RX_FIFO_INT_ENABLED;

        HAL_INTERRUPT_UNMASK(chan->isr_vector);
        break;
    case __COMMCTL_IRQ_DISABLE:
        ret = irq_state;