Subversion Repositories openrisc_2011-10-31

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

//

//      io/serial/powerpc/cogent_serial_with_ints.c

//

//      PowerPC Cogent 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 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

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// 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

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//####ECOSGPLCOPYRIGHTEND####

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

//#####DESCRIPTIONBEGIN####

//

// Author(s):   jskov, based on ARM driver by gthomas

// Contributors:gthomas, jskov

// Date:        1999-03-02

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

// Description: 

//

// To Do:

//   Put in magic to effectively use the FIFOs. Transmitter FIFO fill is a

//   problem, and setting receiver FIFO interrupts to happen only after

//   n chars may conflict with hal diag.

//   

//####DESCRIPTIONEND####

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

#include <pkgconf/io_serial.h>

#include <pkgconf/io.h>

#include <cyg/io/io.h>

#include <cyg/hal/hal_intr.h>

#include <cyg/io/devtab.h>

#include <cyg/infra/diag.h>

#include <cyg/io/serial.h>

#ifdef CYGPKG_IO_SERIAL_POWERPC_COGENT

#include "cogent_serial.h"

// Make sure the configuration is sane.

#if defined(CYGPKG_IO_SERIAL_POWERPC_COGENT_SERIAL_A) && \

    defined(CYGPKG_IO_SERIAL_POWERPC_COGENT_SERIAL_B) && \

    !defined(CYGIMP_KERNEL_INTERRUPTS_CHAIN)

#error "Need CYGIMP_KERNEL_INTERRUPTS_CHAIN to support both ports"

#endif

#define BUFSIZE 128

typedef struct cogent_serial_info {

    CYG_ADDRWORD   base;

    CYG_WORD       int_num;

    cyg_interrupt  serial_interrupt;

    cyg_handle_t   serial_interrupt_handle;

} cogent_serial_info;

static bool cogent_serial_init(struct cyg_devtab_entry *tab);

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

static Cyg_ErrNo cogent_serial_lookup(struct cyg_devtab_entry **tab,

                                   struct cyg_devtab_entry *sub_tab,

                                   const char *name);

static unsigned char cogent_serial_getc(serial_channel *chan);

static Cyg_ErrNo cogent_serial_set_config(serial_channel *chan, cyg_uint32 key,

                                          const void *xbuf, cyg_uint32 *len);

static void cogent_serial_start_xmit(serial_channel *chan);

static void cogent_serial_stop_xmit(serial_channel *chan);

static cyg_uint32 cogent_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);

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

static SERIAL_FUNS(cogent_serial_funs,

                   cogent_serial_putc,

                   cogent_serial_getc,

                   cogent_serial_set_config,

                   cogent_serial_start_xmit,

                   cogent_serial_stop_xmit

    );

#ifdef CYGPKG_IO_SERIAL_POWERPC_COGENT_SERIAL_A

static cogent_serial_info cogent_serial_info0 ={CMA_SER_16550_BASE_A,

                                                CYGNUM_HAL_INTERRUPT_SIU_IRQ1};

#if CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_A_BUFSIZE > 0

static unsigned char cogent_serial_out_buf0[CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_A_BUFSIZE];

static unsigned char cogent_serial_in_buf0[CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_A_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(cogent_serial_channel0,

                                       cogent_serial_funs,

                                       cogent_serial_info0,

                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_A_BAUD),

                                       CYG_SERIAL_STOP_DEFAULT,

                                       CYG_SERIAL_PARITY_DEFAULT,

                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,

                                       CYG_SERIAL_FLAGS_DEFAULT,

                                       &cogent_serial_out_buf0[0],

                                       sizeof(cogent_serial_out_buf0),

                                       &cogent_serial_in_buf0[0],

                                       sizeof(cogent_serial_in_buf0)

    );

#else

static SERIAL_CHANNEL(cogent_serial_channel0,

                      cogent_serial_funs,

                      cogent_serial_info0,

                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_A_BAUD),

                      CYG_SERIAL_STOP_DEFAULT,

                      CYG_SERIAL_PARITY_DEFAULT,

                      CYG_SERIAL_WORD_LENGTH_DEFAULT,

                      CYG_SERIAL_FLAGS_DEFAULT

    );

#endif

DEVTAB_ENTRY(cogent_serial_io0,

             CYGDAT_IO_SERIAL_POWERPC_COGENT_SERIAL_A_NAME,

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

             &cyg_io_serial_devio,

             cogent_serial_init,

             cogent_serial_lookup,     // Serial driver may need initializing

             &cogent_serial_channel0

    );

#endif

#ifdef CYGPKG_IO_SERIAL_POWERPC_COGENT_SERIAL_B

static cogent_serial_info cogent_serial_info1 ={CMA_SER_16550_BASE_B,

                                                CYGNUM_HAL_INTERRUPT_SIU_IRQ1};

#if CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_B_BUFSIZE > 0

static unsigned char cogent_serial_out_buf1[CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_B_BUFSIZE];

static unsigned char cogent_serial_in_buf1[CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_B_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(cogent_serial_channel1,

                                       cogent_serial_funs,

                                       cogent_serial_info1,

                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_B_BAUD),

                                       CYG_SERIAL_STOP_DEFAULT,

                                       CYG_SERIAL_PARITY_DEFAULT,

                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,

                                       CYG_SERIAL_FLAGS_DEFAULT,

                                       &cogent_serial_out_buf1[0],

                                       sizeof(cogent_serial_out_buf1),

                                       &cogent_serial_in_buf1[0],

                                       sizeof(cogent_serial_in_buf1)

    );

#else

static SERIAL_CHANNEL(cogent_serial_channel1,

                      cogent_serial_funs,

                      cogent_serial_info1,

                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_COGENT_SERIAL_B_BAUD),

                      CYG_SERIAL_STOP_DEFAULT,

                      CYG_SERIAL_PARITY_DEFAULT,

                      CYG_SERIAL_WORD_LENGTH_DEFAULT,

                      CYG_SERIAL_FLAGS_DEFAULT

    );

#endif

DEVTAB_ENTRY(cogent_serial_io1,

             CYGDAT_IO_SERIAL_POWERPC_COGENT_SERIAL_B_NAME,

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

             &cyg_io_serial_devio,

             cogent_serial_init,

             cogent_serial_lookup,     // Serial driver may need initializing

             &cogent_serial_channel1

    );

#endif

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

static bool

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

{

    cogent_serial_info *cogent_chan = (cogent_serial_info *)chan->dev_priv;

    cyg_addrword_t port = cogent_chan->base;

    cyg_uint16 baud_divisor = select_baud[new_config->baud];

    cyg_uint8 _lcr, _ier;

    if (baud_divisor == 0)

        return false;    // Invalid baud rate selected

    // Disable port interrupts while changing hardware

    HAL_READ_UINT8(port+SER_16550_IER, _ier);

    HAL_WRITE_UINT8(port+SER_16550_IER, 0);

    // Set databits, stopbits and parity.

    _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_UINT8(port+SER_16550_LCR, _lcr);

    // Set baud rate.

    _lcr |= LCR_DL;

    HAL_WRITE_UINT8(port+SER_16550_LCR, _lcr);

    HAL_WRITE_UINT8(port+SER_16550_DLM, baud_divisor >> 8);

    HAL_WRITE_UINT8(port+SER_16550_DLL, baud_divisor & 0xff);

    _lcr &= ~LCR_DL;

    HAL_WRITE_UINT8(port+SER_16550_LCR, _lcr);

    if (init) {

        // Enable and clear FIFO

        HAL_WRITE_UINT8(port+SER_16550_FCR,

                        (FCR_ENABLE | FCR_CLEAR_RCVR | FCR_CLEAR_XMIT));

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

            HAL_WRITE_UINT8(port+SER_16550_IER, SIO_IER_ERDAI);

        } else {

            HAL_WRITE_UINT8(port+SER_16550_IER, 0);

        }

        {

            // Special initialization for ST16C552 on CMA102

            cyg_uint8 mcr;

            HAL_READ_UINT8(CMA_SER_16550_BASE_A+SER_16550_MCR, mcr);

            mcr |= 8;

            HAL_WRITE_UINT8(CMA_SER_16550_BASE_A+SER_16550_MCR, mcr);

            HAL_READ_UINT8(CMA_SER_16550_BASE_B+SER_16550_MCR, mcr);

            mcr |= 8;

            HAL_WRITE_UINT8(CMA_SER_16550_BASE_B+SER_16550_MCR, mcr);

        }

    } else {

        HAL_WRITE_UINT8(port+SER_16550_IER, _ier);

    }

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

        chan->config = *new_config;

    }

    return true;

}

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

static bool

cogent_serial_init(struct cyg_devtab_entry *tab)

{

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

    cogent_serial_info *cogent_chan = (cogent_serial_info *)chan->dev_priv;

#ifdef CYGDBG_IO_INIT

    diag_printf("COGENT SERIAL init - dev: %x.%d\n", cogent_chan->base, cogent_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(cogent_chan->int_num,

                                 0,         // can change IRQ0 priority

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

                                 cogent_serial_ISR,

                                 cogent_serial_DSR,

                                 &cogent_chan->serial_interrupt_handle,

                                 &cogent_chan->serial_interrupt);

        cyg_drv_interrupt_attach(cogent_chan->serial_interrupt_handle);

        cyg_drv_interrupt_unmask(cogent_chan->int_num);

    }

    cogent_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

cogent_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

cogent_serial_putc(serial_channel *chan, unsigned char c)

{

    cogent_serial_info *cogent_chan = (cogent_serial_info *)chan->dev_priv;

    cyg_addrword_t port = cogent_chan->base;

    cyg_uint8 _lsr;

    HAL_READ_UINT8(port+SER_16550_LSR, _lsr);

    if (_lsr & SIO_LSR_THRE) {

// Transmit buffer is empty

        HAL_WRITE_UINT8(port+SER_16550_THR, c);

        return true;

    } else {

// No space

        return false;

    }

}

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

static unsigned char

cogent_serial_getc(serial_channel *chan)

{

    unsigned char c;

    cogent_serial_info *cogent_chan = (cogent_serial_info *)chan->dev_priv;

    cyg_addrword_t port = cogent_chan->base;

    cyg_uint8 _lsr;

    do {

        HAL_READ_UINT8(port+SER_16550_LSR, _lsr);

    } while ((_lsr & SIO_LSR_DR) == 0);

    HAL_READ_UINT8(port+SER_16550_RBR, c);

    return c;

}

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

static Cyg_ErrNo

cogent_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 != cogent_serial_config_port(chan, config, false) )

            return -EINVAL;

      }

      break;

    default:

        return -EINVAL;

    }

    return ENOERR;

}

// Enable the transmitter on the device

static void

cogent_serial_start_xmit(serial_channel *chan)

{

    cogent_serial_info *cogent_chan = (cogent_serial_info *)chan->dev_priv;

    cyg_addrword_t port = cogent_chan->base;

    cyg_uint8 _ier;

    HAL_READ_UINT8(port+SER_16550_IER, _ier);

    _ier |= IER_XMT;                    // Enable xmit interrupt

    HAL_WRITE_UINT8(port+SER_16550_IER, _ier);

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

}

// Disable the transmitter on the device

static void

cogent_serial_stop_xmit(serial_channel *chan)

{

    cogent_serial_info *cogent_chan = (cogent_serial_info *)chan->dev_priv;

    cyg_addrword_t port = cogent_chan->base;

    cyg_uint8 _ier;

    HAL_READ_UINT8(port+SER_16550_IER, _ier);

    _ier &= ~IER_XMT;                   // Disable xmit interrupt

    HAL_WRITE_UINT8(port+SER_16550_IER, _ier);

}

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

static cyg_uint32

cogent_serial_ISR(cyg_vector_t vector, cyg_addrword_t data)

{

    serial_channel *chan = (serial_channel *)data;

    cogent_serial_info *cogent_chan = (cogent_serial_info *)chan->dev_priv;

    cyg_drv_interrupt_mask(cogent_chan->int_num);

    cyg_drv_interrupt_acknowledge(cogent_chan->int_num);

    return CYG_ISR_CALL_DSR;  // Cause DSR to be run

}

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

static void

cogent_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)

{

    serial_channel *chan = (serial_channel *)data;

    cogent_serial_info *cogent_chan = (cogent_serial_info *)chan->dev_priv;

    cyg_addrword_t port = cogent_chan->base;

    cyg_uint8 _iir;

    HAL_READ_UINT8(port+SER_16550_IIR, _iir);

    _iir &= SIO_IIR_ID_MASK;

    if ( ISR_Tx == _iir ) {

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

    } else if ( ISR_Rx == _iir ) {

        cyg_uint8 _c;

        HAL_READ_UINT8(port+SER_16550_RBR, _c);

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

    }

    cyg_drv_interrupt_unmask(cogent_chan->int_num);

}

#endif