Subversion Repositories openrisc

//==========================================================================

//

//      io/serial/arm/smdk2410_serial.c

//

//      Samsung SMDK2410 Serial I/O Interface Module (interrupt driven)

//

//==========================================================================

// ####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):    michael anburaj <michaelanburaj@hotmail.com>

// Contributors: michael anburaj <michaelanburaj@hotmail.com>

// Date:         2003-08-01

// Purpose:      SMDK2410 Serial I/O module (interrupt driven version)

// Description: 

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include <pkgconf/system.h>

#include <pkgconf/io_serial.h>

#include <pkgconf/io.h>

#include <cyg/io/io.h>

#include <cyg/hal/hal_intr.h>           // interrupt

#include <cyg/hal/hal_io.h>             // register base

#include <cyg/io/devtab.h>

#include <cyg/io/serial.h>

#include <cyg/infra/diag.h>

#ifdef CYGPKG_IO_SERIAL_ARM_SMDK2410

#include "smdk2410_serial.h"

typedef struct smdk2410_serial_info {

    CYG_ADDRWORD   base;

    CYG_WORD       int_num;

    cyg_uint32     bit_sub_rxd;

    cyg_interrupt  serial_interrupt;

    cyg_handle_t   serial_interrupt_handle;

} smdk2410_serial_info;

static bool smdk2410_serial_init(struct cyg_devtab_entry *tab);

static bool smdk2410_serial_putc(serial_channel *chan, unsigned char c);

static Cyg_ErrNo smdk2410_serial_lookup(struct cyg_devtab_entry **tab,

                                        struct cyg_devtab_entry *sub_tab,

                                        const char *name);

static unsigned char smdk2410_serial_getc(serial_channel *chan);

static Cyg_ErrNo smdk2410_serial_set_config(serial_channel *chan,

                                            cyg_uint32 key,

                                            const void *xbuf, cyg_uint32 *len);

static void smdk2410_serial_start_xmit(serial_channel *chan);

static void smdk2410_serial_stop_xmit(serial_channel *chan);

static cyg_uint32 smdk2410_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);

static void       smdk2410_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);

static SERIAL_FUNS(smdk2410_serial_funs,

                   smdk2410_serial_putc,

                   smdk2410_serial_getc,

                   smdk2410_serial_set_config,

                   smdk2410_serial_start_xmit,

                   smdk2410_serial_stop_xmit

    );

#ifdef CYGPKG_IO_SERIAL_ARM_SMDK2410_SERIAL0

static smdk2410_serial_info smdk2410_serial_info0 = {(cyg_uint32)ULCON0,

                                                     CYGNUM_HAL_INTERRUPT_UART0,

                                                     BIT_SUB_RXD0};

#if CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL0_BUFSIZE > 0

static unsigned char smdk2410_serial_out_buf0[CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL0_BUFSIZE];

static unsigned char smdk2410_serial_in_buf0[CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL0_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(smdk2410_serial_channel0,

                                       smdk2410_serial_funs,

                                       smdk2410_serial_info0,

                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL0_BAUD),

                                       CYG_SERIAL_STOP_DEFAULT,

                                       CYG_SERIAL_PARITY_DEFAULT,

                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,

                                       CYG_SERIAL_FLAGS_DEFAULT,

                                       &smdk2410_serial_out_buf0[0], sizeof(smdk2410_serial_out_buf0),

                                       &smdk2410_serial_in_buf0[0], sizeof(smdk2410_serial_in_buf0)

    );

#else

static SERIAL_CHANNEL(smdk2410_serial_channel0,

                      smdk2410_serial_funs,

                      smdk2410_serial_info0,

                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL0_BAUD),

                      CYG_SERIAL_STOP_DEFAULT,

                      CYG_SERIAL_PARITY_DEFAULT,

                      CYG_SERIAL_WORD_LENGTH_DEFAULT,

                      CYG_SERIAL_FLAGS_DEFAULT

    );

#endif

DEVTAB_ENTRY(smdk2410_serial_io0,

             CYGDAT_IO_SERIAL_ARM_SMDK2410_SERIAL0_NAME,

             0,                          // Does not depend on a lower level interface

             &cyg_io_serial_devio,

             smdk2410_serial_init,

             smdk2410_serial_lookup,     // Serial driver may need initializing

             &smdk2410_serial_channel0

    );

#endif //  CYGPKG_IO_SERIAL_ARM_SMDK2410_SERIAL0

#ifdef CYGPKG_IO_SERIAL_ARM_SMDK2410_SERIAL1

static smdk2410_serial_info smdk2410_serial_info1 = {(cyg_uint32)ULCON1,

                                                     CYGNUM_HAL_INTERRUPT_UART1,

                                                     BIT_SUB_RXD1};

#if CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL1_BUFSIZE > 0

static unsigned char smdk2410_serial_out_buf1[CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL1_BUFSIZE];

static unsigned char smdk2410_serial_in_buf1[CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL1_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(smdk2410_serial_channel1,

                                       smdk2410_serial_funs,

                                       smdk2410_serial_info1,

                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL1_BAUD),

                                       CYG_SERIAL_STOP_DEFAULT,

                                       CYG_SERIAL_PARITY_DEFAULT,

                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,

                                       CYG_SERIAL_FLAGS_DEFAULT,

                                       &smdk2410_serial_out_buf1[0], sizeof(smdk2410_serial_out_buf1),

                                       &smdk2410_serial_in_buf1[0], sizeof(smdk2410_serial_in_buf1)

    );

#else

static SERIAL_CHANNEL(smdk2410_serial_channel1,

                      smdk2410_serial_funs,

                      smdk2410_serial_info1,

                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL1_BAUD),

                      CYG_SERIAL_STOP_DEFAULT,

                      CYG_SERIAL_PARITY_DEFAULT,

                      CYG_SERIAL_WORD_LENGTH_DEFAULT,

                      CYG_SERIAL_FLAGS_DEFAULT

    );

#endif

DEVTAB_ENTRY(smdk2410_serial_io1,

             CYGDAT_IO_SERIAL_ARM_SMDK2410_SERIAL1_NAME,

             0,                          // Does not depend on a lower level interface

             &cyg_io_serial_devio,

             smdk2410_serial_init,

             smdk2410_serial_lookup,     // Serial driver may need initializing

             &smdk2410_serial_channel1

    );

#endif //  CYGPKG_IO_SERIAL_ARM_SMDK2410_SERIAL1

// Internal function to actually configure the hardware to desired baud rate, etc.

static bool

smdk2410_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)

{

    smdk2410_serial_info *smdk2410_chan = (smdk2410_serial_info *)chan->dev_priv;

    CYG_ADDRWORD base = smdk2410_chan->base;

    unsigned short baud_divisor = select_baud[new_config->baud];

    cyg_uint32 _lcr;

    if (baud_divisor == 0) return false;

    if (init) {

        //UART FIFO control register

        HAL_WRITE_UINT32(base+OFS_UFCON, (3<<6) | (3<<4) | (1<<2) | (1<<1) | (1<<0));

        //UART modem control register

        HAL_WRITE_UINT32(base+OFS_UMCON, 0);

    }

    _lcr = select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5] |

        select_stop_bits[new_config->stop] |

        select_parity[new_config->parity];

    HAL_WRITE_UINT32(base+OFS_ULCON, _lcr);

    //UART control register, Enable Rx Timeout Int

    HAL_WRITE_UINT32(base+OFS_UCON, 0x085);

    if (new_config != &chan->config) {

        chan->config = *new_config;

    }

    return true;

}

// Function to initialize the device.  Called at bootstrap time.

static bool

smdk2410_serial_init(struct cyg_devtab_entry *tab)

{

    serial_channel *chan = (serial_channel *)tab->priv;

    smdk2410_serial_info *smdk2410_chan = (smdk2410_serial_info *)chan->dev_priv;

    cyg_uint32 _intsubm;

#ifdef CYGDBG_IO_INIT

    diag_printf("SMDK2410 SERIAL init - dev: 0x%08x.%d\n",

                smdk2410_chan->base, smdk2410_chan->int_num);

#endif

    (chan->callbacks->serial_init)(chan);  // Really only required for interrupt driven devices

    if (chan->out_cbuf.len != 0) {

        cyg_drv_interrupt_create(smdk2410_chan->int_num,

                                 1,                    // Priority - unused

                                 (cyg_addrword_t)chan, //  Data item passed to interrupt handler

                                 smdk2410_serial_ISR,

                                 smdk2410_serial_DSR,

                                 &smdk2410_chan->serial_interrupt_handle,

                                 &smdk2410_chan->serial_interrupt);

        cyg_drv_interrupt_attach(smdk2410_chan->serial_interrupt_handle);

        cyg_drv_interrupt_unmask(smdk2410_chan->int_num);

        HAL_READ_UINT32(INTSUBMSK, _intsubm);

        _intsubm &= ~(smdk2410_chan->bit_sub_rxd<<0);         // BIT_SUB_RXD

        HAL_WRITE_UINT32(INTSUBMSK, _intsubm);

    }

    smdk2410_serial_config_port(chan, &chan->config, true);

    return true;

}

// This routine is called when the device is "looked" up (i.e. attached)

static Cyg_ErrNo

smdk2410_serial_lookup(struct cyg_devtab_entry **tab,

                  struct cyg_devtab_entry *sub_tab,

                  const char *name)

{

    serial_channel *chan = (serial_channel *)(*tab)->priv;

    (chan->callbacks->serial_init)(chan);  // Really only required for interrupt driven devices

    return ENOERR;

}

// Send a character to the device output buffer.

// Return 'true' if character is sent to device

static bool

smdk2410_serial_putc(serial_channel *chan, unsigned char c)

{

    smdk2410_serial_info *smdk2410_chan = (smdk2410_serial_info *)chan->dev_priv;

    CYG_ADDRWORD base = smdk2410_chan->base;

    cyg_uint32 _status;

    HAL_READ_UINT32(base+OFS_UFSTAT, _status);

    if (_status & 0x200) {

        // No space

        return false;

    } else {

        // Transmit buffer is not full

        HAL_WRITE_UINT8(base+OFS_UTXH, (cyg_uint32)c);

        return true;

    }

}

// Fetch a character from the device input buffer, waiting if necessary

static unsigned char

smdk2410_serial_getc(serial_channel *chan)

{

    smdk2410_serial_info *smdk2410_chan = (smdk2410_serial_info *)chan->dev_priv;

    CYG_ADDRWORD base = smdk2410_chan->base;

    cyg_uint32 _status;

    cyg_uint8 _c;

    do {

        HAL_READ_UINT32(base+OFS_UFSTAT, _status);

    } while ((_status & 0xf) == 0);

    HAL_READ_UINT8(base+OFS_URXH, _c);

    return (unsigned char)_c;

}

// Set up the device characteristics; baud rate, etc.

static Cyg_ErrNo

smdk2410_serial_set_config(serial_channel *chan, cyg_uint32 key,

                      const void *xbuf, cyg_uint32 *len)

{

    switch (key) {

    case CYG_IO_SET_CONFIG_SERIAL_INFO:

      {

        cyg_serial_info_t *config = (cyg_serial_info_t *)xbuf;

        if ( *len < sizeof(cyg_serial_info_t) ) {

            return -EINVAL;

        }

        *len = sizeof(cyg_serial_info_t);

        if ( true != smdk2410_serial_config_port(chan, config, false) )

            return -EINVAL;

      }

      break;

    default:

        return -EINVAL;

    }

    return ENOERR;

}

// Enable the transmitter on the device

static void

smdk2410_serial_start_xmit(serial_channel *chan)

{

    smdk2410_serial_info *smdk2410_chan = (smdk2410_serial_info *)chan->dev_priv;

    cyg_uint32 _intsubm;

    HAL_READ_UINT32(INTSUBMSK, _intsubm);

    _intsubm &= ~(smdk2410_chan->bit_sub_rxd<<1);         // BIT_SUB_TXD

    HAL_WRITE_UINT32(INTSUBMSK, _intsubm);

}

// Disable the transmitter on the device

static void

smdk2410_serial_stop_xmit(serial_channel *chan)

{

    smdk2410_serial_info *smdk2410_chan = (smdk2410_serial_info *)chan->dev_priv;

    cyg_uint32 _intsubm;

    HAL_READ_UINT32(INTSUBMSK, _intsubm);

    _intsubm |= (smdk2410_chan->bit_sub_rxd<<1);          // BIT_SUB_TXD

    HAL_WRITE_UINT32(INTSUBMSK, _intsubm);

}

// Serial I/O - low level interrupt handler (ISR)

static cyg_uint32

smdk2410_serial_ISR(cyg_vector_t vector, cyg_addrword_t data)

{

    serial_channel *chan = (serial_channel *)data;

    smdk2410_serial_info *smdk2410_chan = (smdk2410_serial_info *)chan->dev_priv;

    cyg_drv_interrupt_mask(smdk2410_chan->int_num);

    cyg_drv_interrupt_acknowledge(smdk2410_chan->int_num);

    return CYG_ISR_CALL_DSR;  // Cause DSR to be run

}

// Serial I/O - high level interrupt handler (DSR)

static void

smdk2410_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)

{

    serial_channel *chan = (serial_channel *)data;

    smdk2410_serial_info *smdk2410_chan = (smdk2410_serial_info *)chan->dev_priv;

    CYG_ADDRWORD base = smdk2410_chan->base;

    cyg_uint32 _intsubpnd, _status, _c;

    cyg_uint32 _rxd_bit = (smdk2410_chan->bit_sub_rxd<<0), _txd_bit=(smdk2410_chan->bit_sub_rxd<<1);

    HAL_READ_UINT32(SUBSRCPND, _intsubpnd);

    // Empty Rx FIFO

    if (_intsubpnd & _rxd_bit) {

        HAL_READ_UINT32(base+OFS_UFSTAT, _status);

        while((_status & 0x0f) != 0) {

            HAL_READ_UINT8(base+OFS_URXH, _c);

            (chan->callbacks->rcv_char)(chan, (unsigned char)_c);

            HAL_READ_UINT32(base+OFS_UFSTAT, _status);

        }

        HAL_WRITE_UINT32(SUBSRCPND, _rxd_bit);

    }

    // Fill into Tx FIFO. xmt_char will mask the interrupt when it

    // runs out of chars, so doing this in a loop is OK.

    if (_intsubpnd & _txd_bit) {

        (chan->callbacks->xmt_char)(chan);

        HAL_WRITE_UINT32(SUBSRCPND, _txd_bit);

    }

    cyg_drv_interrupt_unmask(smdk2410_chan->int_num);

}

#endif // CYGPKG_IO_SERIAL_ARM_SMDK2410

// EOF smdk2410_serial.c