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/*

 * Project: S.Ha.R.K.

 *

 * Coordinators:

 *   Giorgio Buttazzo    <giorgio@sssup.it>

 *   Paolo Gai           <pj@gandalf.sssup.it>

 *

 * Authors     :

 *   Paolo Gai           <pj@gandalf.sssup.it>

 *   (see the web pages for full authors list)

 *

 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)

 *

 * http://www.sssup.it

 * http://retis.sssup.it

 * http://shark.sssup.it

 */

/*

 * Copyright (C) 2000 Michele Cirinei

 *

 * This program 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 of the License, or

 * (at your option) any later version.

 *

 * This program 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 this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#include <kernel/kern.h>

#include <drivers/scomirq.h>

/****************************

 Variables

****************************/

static unsigned com_irq[] = {COM1_IRQ, COM2_IRQ, COM3_IRQ, COM4_IRQ};

struct SCom_Access_Type SCom_Access;

unsigned SCom_Error;

struct TX_data_t{

    int ptr;

    int len;

    BYTE buf[100];

};

static struct TX_data_t SCom_TX_data;

/*****************************

* Functions

*****************************/

void RBRF_handler(unsigned port);

void THRE_handler(unsigned port);

void LSR_handler(unsigned port);

void com_send_msg(unsigned port, BYTE len, BYTE *m);

void com_irq_sel(int no)

{

    BYTE b;

    unsigned i;

    for(i=0;i<4;i++)

      if (com_irq[i] == no) break;

    b = DECODE(com_read(i, IIR));

    switch (b)

    {  

        case LS_CHANGED:

            LSR_handler(i);

        break;

        case RX_FULL:

            RBRF_handler(i);

        break;

        case TX_EMPTY:

            THRE_handler(i);

        break;

    }

}      

void com_irq_enable(unsigned port, unsigned irq)

{

    SYS_FLAGS f;

    f = kern_fsave();

    com_read(port, LSR);

    com_read(port, IIR);

    com_write(port, IER, com_read(port, IER) | irq); /* Enable  irq */

    kern_frestore(f);

}

void com_irq_disable(unsigned port, unsigned irq)

{

    SYS_FLAGS f;

    f = kern_fsave();

    com_read(port, LSR);

    com_read(port, IIR);

    com_write(port, IER, com_read(port, IER) & ~irq); /* Disable irq */

    kern_frestore(f);

}

void com_close_irq(unsigned port)

{

    SYS_FLAGS f;

    f = kern_fsave();

    com_write(port, IER, 0);

    com_read(port, LSR);

    com_read(port, IIR);

    handler_remove(com_irq[port]);

    kern_frestore(f);

}

void com_init_irq(unsigned port)

{

    SYS_FLAGS f;

    f = kern_fsave();

    SCom_Error = 0;

    handler_set(com_irq[port], com_irq_sel, NIL, TRUE);

    com_irq_disable(port, ALL_IRQ);     /* Disable interrupts */

    kern_frestore(f);

}

void com_set_functions(void (*confirm)(unsigned port, BYTE msg_status),void (*indication)(unsigned port, BYTE data))

{

    SYS_FLAGS f;

    f = kern_fsave();

    SCom_Access.confirm    = confirm;

    SCom_Access.request    = com_send_msg;

    SCom_Access.indication = indication;

    kern_frestore(f);

}

void com_send_msg(unsigned port, BYTE len, BYTE *m)

{

    SYS_FLAGS f;

    f = kern_fsave();

    com_irq_disable(port, ALL_IRQ);     /* Disable interrupts */

    /* Transmit first byte of message  */

    SCom_TX_data.ptr = 0;

    SCom_TX_data.len = len;

    if (len < 100) {

      memcpy(SCom_TX_data.buf, m, len);

      com_write(port, THR, SCom_TX_data.buf[SCom_TX_data.ptr++]);

      com_irq_enable(port, THRE_IRQ);  /* Enable THRE */

    }

    kern_frestore(f);

}

__inline__ void com_irq_send(unsigned port, BYTE len, BYTE *m) {

  com_send_msg(port, len, m);

}

void THRE_handler (unsigned port) /* Transmit Data Register Ready for next byte */

{

    if (SCom_TX_data.ptr < SCom_TX_data.len)

        com_write(port, THR, SCom_TX_data.buf[SCom_TX_data.ptr++]);

    else

    {

        com_irq_disable(port, THRE_IRQ);

        while((com_read(port,LSR) & bit6) == 0); /* Wait until last byte sent */

        SCom_Access.confirm(port, COM_OK);

    }

}

void RBRF_handler (unsigned port) /* Receive Data Register Full */

{

    SCom_Access.indication(port, com_read(port, RBR));

}

void LSR_handler (unsigned port)    /* break = 8, frame = 4, parity = 2, RBR overrun = 1*/

{

    SCom_Error = (com_read(port, LSR) & (bit4|bit3|bit2|bit1) ) >> 1;

    com_irq_disable(port, ALL_IRQ);  /* Disable all interrupts */

    SCom_Access.confirm(port, COM_ERROR);  

}