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/*

 *  This file contains the PowerPC 403GA console IO package.

 *

 *  Author:     Thomas Doerfler <td@imd.m.isar.de>

 *              IMD Ingenieurbuero fuer Microcomputertechnik

 *

 *  COPYRIGHT (c) 1998 by IMD

 *

 *  Changes from IMD are covered by the original distributions terms.

 *  changes include interrupt support and termios support

 *  for backward compatibility, the original polled driver has been

 *  renamed to console.c.polled

 *

 *  This file has been initially created (polled version) by

 *

 *  Author:     Andrew Bray <andy@i-cubed.co.uk>

 *

 *  COPYRIGHT (c) 1995 by i-cubed ltd.

 *

 *  To anyone who acknowledges that this file is provided "AS IS"

 *  without any express or implied warranty:

 *      permission to use, copy, modify, and distribute this file

 *      for any purpose is hereby granted without fee, provided that

 *      the above copyright notice and this notice appears in all

 *      copies, and that the name of i-cubed limited not be used in

 *      advertising or publicity pertaining to distribution of the

 *      software without specific, written prior permission.

 *      i-cubed limited makes no representations about the suitability

 *      of this software for any purpose.

 *

 *  Modifications for spooling (interrupt driven) console driver

 *            by Thomas Doerfler <td@imd.m.isar.de>

 *  for these modifications:

 *  COPYRIGHT (c) 1997 by IMD, Puchheim, Germany.

 *

 *  To anyone who acknowledges that this file is provided "AS IS"

 *  without any express or implied warranty:

 *      permission to use, copy, modify, and distribute this file

 *      for any purpose is hereby granted without fee, provided that

 *      the above copyright notice and this notice appears in all

 *      copies. IMD makes no representations about the suitability

 *      of this software for any purpose.

 *

 *  Derived from c/src/lib/libbsp/no_cpu/no_bsp/console/console.c:

 *

 *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.

 *  On-Line Applications Research Corporation (OAR).

 *  All rights assigned to U.S. Government, 1994.

 *

 *  This material may be reproduced by or for the U.S. Government pursuant

 *  to the copyright license under the clause at DFARS 252.227-7013.  This

 *  notice must appear in all copies of this file and its derivatives.

 *

 *  console.c,v 1.4 1995/12/05 19:23:02 joel Exp

 */

#define NO_BSP_INIT

#include <rtems.h>

#include <rtems/libio.h>

#include "../ictrl/ictrl.h"

#include <stdlib.h>                                     /* for atexit() */

struct async {

/*---------------------------------------------------------------------------+

| Line Status Register.

+---------------------------------------------------------------------------*/

  unsigned char SPLS;

  unsigned char SPLSset;

#define LSRDataReady             0x80

#define LSRFramingError          0x40

#define LSROverrunError          0x20

#define LSRParityError           0x10

#define LSRBreakInterrupt        0x08

#define LSRTxHoldEmpty           0x04

#define LSRTxShiftEmpty          0x02

/*---------------------------------------------------------------------------+

| Handshake Status Register.

+---------------------------------------------------------------------------*/

  unsigned char SPHS;

  unsigned char SPHSset;

#define HSRDsr                   0x80

#define HSRCts                   0x40

/*---------------------------------------------------------------------------+

| Baud rate divisor registers

+---------------------------------------------------------------------------*/

  unsigned char BRDH;

  unsigned char BRDL;

/*---------------------------------------------------------------------------+

| Control Register.

+---------------------------------------------------------------------------*/

  unsigned char SPCTL;

#define CRNormal                 0x00

#define CRLoopback               0x40

#define CRAutoEcho               0x80

#define CRDtr                    0x20

#define CRRts                    0x10

#define CRWordLength7            0x00

#define CRWordLength8            0x08

#define CRParityDisable          0x00

#define CRParityEnable           0x04

#define CREvenParity             0x00

#define CROddParity              0x02

#define CRStopBitsOne            0x00

#define CRStopBitsTwo            0x01

#define CRDisableDtrRts          0x00

/*--------------------------------------------------------------------------+

| Receiver Command Register.

+--------------------------------------------------------------------------*/

  unsigned char SPRC;

#define RCRDisable               0x00

#define RCREnable                0x80

#define RCRIntDisable            0x00

#define RCRIntEnabled            0x20

#define RCRDMACh2                0x40

#define RCRDMACh3                0x60

#define RCRErrorInt              0x10

#define RCRPauseEnable           0x08

/*--------------------------------------------------------------------------+

| Transmitter Command Register.

+--------------------------------------------------------------------------*/

    unsigned char SPTC;

#define TCRDisable               0x00

#define TCREnable                0x80

#define TCRIntDisable            0x00

#define TCRIntEnabled            0x20

#define TCRDMACh2                0x40

#define TCRDMACh3                0x60

#define TCRTxEmpty               0x10

#define TCRErrorInt              0x08

#define TCRStopPause             0x04

#define TCRBreakGen              0x02

/*--------------------------------------------------------------------------+

| Miscellanies defines.

+--------------------------------------------------------------------------*/

  unsigned char SPTB;

#define SPRB    SPTB

};

typedef volatile struct async *pasync;

static const pasync port = (pasync)0x40000000;

static void *spittyp;         /* handle for termios */

int ppc403_spi_interrupt = 1; /* do not use interrupts... */

/*

 * Rx Interrupt handler

 */

static rtems_isr

spiRxInterruptHandler (rtems_vector_number v)

{

  char ch;

  /* clear any receive errors (errors are ignored now) */

  port->SPLS = (LSRFramingError | LSROverrunError |

                LSRParityError  | LSRBreakInterrupt);

  /*

   * Buffer received?

   */

  if (port->SPLS & LSRDataReady) {

    ch = port->SPRB; /* read receive buffer */

    rtems_termios_enqueue_raw_characters (spittyp,&ch,1);

  }

}

/*

 * Tx Interrupt handler

 */

static rtems_isr

spiTxInterruptHandler (rtems_vector_number v)

{

  /*

   * char transmitted?

   */

  if (0 != (port->SPLS & LSRTxHoldEmpty)) { /* must always be true!! */

    port->SPTC &= ~TCRIntEnabled;           /* stop irqs for now...  */

                                            /* and call termios...   */

    rtems_termios_dequeue_characters (spittyp,1);

  }

}

/*

 * enable/disable RTS line to start/stop remote transmitter

 */

static int

spiStartRemoteTx (int minor)

{

  rtems_interrupt_level level;

  rtems_interrupt_disable (level);

  port->SPCTL |= CRRts;           /* activate RTS  */

  rtems_interrupt_enable (level);

  return 0;

}

static int

spiStopRemoteTx (int minor)

{

  rtems_interrupt_level level;

  rtems_interrupt_disable (level);

  port->SPCTL &= ~CRRts;           /* deactivate RTS  */

  rtems_interrupt_enable (level);

  return 0;

}

void

spiBaudSet(unsigned32 baudrate)

{

  unsigned32 tmp;

  tmp = rtems_cpu_configuration_get_serial_per_sec() / baudrate;

  tmp = ((tmp) >> 4) - 1;

  port->BRDL = tmp & 0xff;

  port->BRDH = tmp >> 8;

}

/*

 * Hardware-dependent portion of tcsetattr().

 */

static int

spiSetAttributes (int minor, const struct termios *t)

{

  int baud;

  /* FIXME: check c_cflag & CRTSCTS for hardware flowcontrol */

  /* FIXME: check and IMPLEMENT XON/XOFF                     */

  switch (t->c_cflag & CBAUD) {

  default:      baud = -1;      break;

  case B50:     baud = 50;      break;

  case B75:     baud = 75;      break;

  case B110:    baud = 110;     break;

  case B134:    baud = 134;     break;

  case B150:    baud = 150;     break;

  case B200:    baud = 200;     break;

  case B300:    baud = 300;     break;

  case B600:    baud = 600;     break;

  case B1200:   baud = 1200;    break;

  case B1800:   baud = 1800;    break;

  case B2400:   baud = 2400;    break;

  case B4800:   baud = 4800;    break;

  case B9600:   baud = 9600;    break;

  case B19200:  baud = 19200;   break;

  case B38400:  baud = 38400;   break;

  case B57600:  baud = 57600;   break;

  case B115200: baud = 115200;  break;

  case B230400: baud = 230400;  break;

  case B460800: baud = 460800;  break;

  }

  if (baud > 0) {

    spiBaudSet(baud);

  }

  return 0;

}

static int

spiPollRead (int minor)

{

  unsigned char status;

  while (0 == ((status = port->SPLS) & LSRDataReady)) {

    /* Clean any dodgy status */

    if ((status & (LSRFramingError | LSROverrunError | LSRParityError |

                   LSRBreakInterrupt)) != 0) {

      port->SPLS = (LSRFramingError | LSROverrunError | LSRParityError |

                    LSRBreakInterrupt);

    }

  }

  return port->SPRB;

}

static int

spiInterruptWrite (int minor, const char *buf, int len)

{

  port->SPTB = *buf;           /* write char to send         */

  port->SPTC |= TCRIntEnabled; /* always enable tx interrupt */

  return 0;

}

static int

spiPollWrite(int minor,const char *buf,int len)

{

  unsigned char status;

  while (len-- > 0) {

    do {

      if (port->SPHS) {

        port->SPHS = (HSRDsr | HSRCts);

      }

      status = port->SPLS;

    } while (0 == (status & LSRTxHoldEmpty));

    port->SPTB = *buf++;

  }

  return 0;

}

/*

 *

 * deinit SPI

 *

 */

void

spiDeInit(void)

{

  /*

   * disable interrupts for serial port

   * set it to state to work with polling boot monitor, if any...

   */

  /* set up baud rate to original state */

  spiBaudSet(rtems_cpu_configuration_get_serial_rate());

  /* clear any receive (error) status */

  port->SPLS = (LSRDataReady   | LSRFramingError | LSROverrunError |

                LSRParityError | LSRBreakInterrupt);

  /* set up port control: DTR/RTS active,8 bit,1 stop,no parity */

  port->SPCTL = (CRNormal |

                 CRDtr | CRRts |

                 CRWordLength8 | CRParityDisable | CRStopBitsOne);

  /* clear handshake status bits */

  port->SPHS = (HSRDsr | HSRCts);

  /* enable receiver/transmitter, no interrupts */

  port->SPRC = (RCREnable | RCRIntDisable);

  port->SPTC = (TCREnable | TCRIntDisable);

}

/*

 *

 * init SPI

 *

 */

rtems_status_code

spiInitialize(void)

{

  register unsigned tmp;

  rtems_isr_entry previous_isr; /* this is a dummy */

  /*

   * Initialise the serial port

   */

  /*

   * select RTS/CTS hardware handshake lines,

   * select clock source

   */

  asm volatile ("mfdcr %0, 0xa0" : "=r" (tmp)); /* IOCR */

  tmp &= ~3;

  tmp |= (rtems_cpu_configuration_get_serial_external_clock() ? 2 : 0) | 1;

  asm volatile ("mtdcr 0xa0, %0" : "=r" (tmp) : "0" (tmp)); /* IOCR */

  /* clear any receive (error) status */

  port->SPLS = (LSRDataReady   | LSRFramingError | LSROverrunError |

                LSRParityError | LSRBreakInterrupt);

  /* set up baud rate */

  spiBaudSet(rtems_cpu_configuration_get_serial_rate());

  /* set up port control: DTR/RTS active,8 bit,1 stop,no parity */

  port->SPCTL = (CRNormal |

                 CRDtr | CRRts |

                 CRWordLength8 | CRParityDisable | CRStopBitsOne);

  /* clear handshake status bits */

  port->SPHS = (HSRDsr | HSRCts);

  if (ppc403_spi_interrupt) {

    /* add rx/tx isr to vector table */

    ictrl_set_vector(spiRxInterruptHandler,

                     PPC_IRQ_EXT_SPIR,

                     &previous_isr);

    ictrl_set_vector(spiTxInterruptHandler,

                     PPC_IRQ_EXT_SPIT,

                     &previous_isr);

    port->SPRC = (RCREnable | RCRIntEnabled | RCRErrorInt);

    port->SPTC = (TCREnable | TCRIntDisable); /* don't enable TxInt yet */

  }

  else {

    /* enable receiver/transmitter, no interrupts */

    port->SPRC = (RCREnable | RCRIntDisable);

    port->SPTC = (TCREnable | TCRIntDisable);

  }

  atexit(spiDeInit);

  return RTEMS_SUCCESSFUL;

}

/*

 ***************

 * BOILERPLATE *

 ***************

 */

/*  console_initialize

 *

 *  This routine initializes the console IO driver.

 *

 *  Input parameters: NONE

 *

 *  Output parameters:  NONE

 *

 *  Return values:

 */

rtems_device_driver console_initialize(

  rtems_device_major_number  major,

  rtems_device_minor_number  minor,

  void                      *arg

)

{

  rtems_status_code status;

  /*

   * Set up TERMIOS

   */

  rtems_termios_initialize ();

  /*

   * Do device-specific initialization

   */

  spiInitialize ();

  /*

   * Register the device

   */

  status = rtems_io_register_name ("/dev/console", major, 0);

  if (status != RTEMS_SUCCESSFUL)

    rtems_fatal_error_occurred (status);

  return RTEMS_SUCCESSFUL;

}

/*

 *  Open entry point

 */

rtems_device_driver console_open(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  rtems_status_code sc;

  static const rtems_termios_callbacks intrCallbacks = {

    NULL,               /* firstOpen */

    NULL,               /* lastClose */

    NULL,               /* pollRead */

    spiInterruptWrite,  /* write */

    spiSetAttributes,   /* setAttributes */

    spiStopRemoteTx,    /* stopRemoteTx */

    spiStartRemoteTx,   /* startRemoteTx */

    1                   /* outputUsesInterrupts */

  };

  static const rtems_termios_callbacks pollCallbacks = {

    NULL,               /* firstOpen */

    NULL,               /* lastClose */

    spiPollRead,        /* pollRead */

    spiPollWrite,       /* write */

    spiSetAttributes,   /* setAttributes */

    spiStopRemoteTx,    /* stopRemoteTx */

    spiStartRemoteTx,   /* startRemoteTx */

  };

  if (ppc403_spi_interrupt) {

    rtems_libio_open_close_args_t *args = arg;

    sc = rtems_termios_open (major, minor, arg, &intrCallbacks);

    spittyp = args->iop->data1;

  }

  else {

    sc = rtems_termios_open (major, minor, arg, &pollCallbacks);

  }

  return sc;

}

/*

 *  Close entry point

 */

rtems_device_driver console_close(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  return rtems_termios_close (arg);

}

/*

 * read bytes from the serial port. We only have stdin.

 */

rtems_device_driver console_read(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  return rtems_termios_read (arg);

}

/*

 * write bytes to the serial port. Stdout and stderr are the same.

 */

rtems_device_driver console_write(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  return rtems_termios_write (arg);

}

/*

 *  IO Control entry point

 */

rtems_device_driver console_control(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  return rtems_termios_ioctl (arg);

}