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

//

//      devs/serial/MCF52xx/MCF5282

//

//      MCF5272 UART 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

// 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####

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

#include <cyg/io/io.h>

#include <cyg/io/devtab.h>

#include <cyg/io/serial.h>

#include <cyg/infra/diag.h>

#include <cyg/hal/hal_intr.h>

#include <cyg/hal/hal_memmap.h>

#include <cyg/infra/cyg_type.h>

#include <cyg/hal/hal_arch.h>

#include <cyg/hal/drv_api.h>

#include <pkgconf/hal.h>

#include <pkgconf/system.h>

#include <pkgconf/io_serial.h>

#include <pkgconf/io.h>

#include <pkgconf/io_serial_mcf5272_uart.h>

#include <cyg/io/ser_mcf5272_uart.h>

/* The UART priority level */

#define MCF5272_UART_PRIORITY_LEVEL 2

/* Autobaud states */

typedef enum autobaud_states_t

{

    AB_IDLE = 0,  /* Normal state. Autobaud process hasn't been initiated yet. */

    AB_BEGIN_BREAK, /* Detected a start of the break */

    AB_BEGIN,       /* Detected the end of the break and has set up the autobaud.*/

}autobaud_states_t;

#define FIELD_OFFSET(type,field) (cyg_uint32)(&(((type*)0)->field))

typedef struct MCF5272_uart_info_t

{

    volatile mcf5272_sim_uart_t*    base;                       // Base address of the UART registers

    uint32                          uart_vector;                // UART interrupt vector number

    cyg_interrupt                   serial_interrupt;           // Interrupt context

    cyg_handle_t                    serial_interrupt_handle;    // Interrupt handle

    volatile uint8                  imr_mirror;                 // Interrupt mask register mirror

    cyg_serial_info_t               config;                     // The channel configuration

    autobaud_states_t               autobaud_state;             // The autobaud state

} MCF5272_uart_info_t;

/* Function prtoftyps for the MCF5272 UART ISR and DSR. */

static cyg_uint32 MCF5272_uart_ISR(cyg_vector_t vector, cyg_addrword_t data);

static void       MCF5272_uart_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);

/* Function prototypes for the serial functions. */

static bool MCF5272_uart_init(struct cyg_devtab_entry * tab);

static Cyg_ErrNo MCF5272_uart_lookup(struct cyg_devtab_entry **tab,

                  struct cyg_devtab_entry *sub_tab,

                  const char *name);

static bool MCF5272_uart_putc(serial_channel *chan, unsigned char c);

static unsigned char MCF5272_uart_getc(serial_channel *chan);

Cyg_ErrNo MCF5272_uart_set_config(serial_channel *chan, cyg_uint32 key,

                            const void *xbuf, cyg_uint32 *len);

static void MCF5272_uart_start_xmit(serial_channel *chan);

static void MCF5272_uart_stop_xmit(serial_channel * chan);

/* Declare the serial functions that are called by the common serial driver layer. */

static SERIAL_FUNS

(

    MCF5272_uart_funs,

    MCF5272_uart_putc,

    MCF5272_uart_getc,

    MCF5272_uart_set_config,

    MCF5272_uart_start_xmit,

    MCF5272_uart_stop_xmit

);

/* Definition for channel 0 UART configuration. */

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

#ifdef CYGPKG_IO_SERIAL_MCF5272_UART_CHANNEL0

/* Data structure contains

   channel informtion.

 */

static MCF5272_uart_info_t MCF5272_uart_channel_info_0;

/* If the channel buffer size is zero, do not include interrupt UART processing */

#if CYGNUM_IO_SERIAL_MCF5272_UART_CHANNEL0_BUFSIZE > 0

/*      Allocated receive and transmit buffer.   The size of the buffer  is */

/* configured by the configtool.                                            */

static unsigned char MCF5272_uart_out_buf0[CYGNUM_IO_SERIAL_MCF5272_UART_CHANNEL0_BUFSIZE];

static unsigned char MCF5272_uart_in_buf0[CYGNUM_IO_SERIAL_MCF5272_UART_CHANNEL0_BUFSIZE];

/*      Channel function table.   We register  the UART  functions here  so */

/* that uppper serial drivers can call the serial driver's routines.        */

static SERIAL_CHANNEL_USING_INTERRUPTS(

    MCF5272_uart_channel_0,

    MCF5272_uart_funs,

    MCF5272_uart_channel_info_0,

    CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_MCF5272_UART_CHANNEL0_BAUD),

    CYG_SERIAL_STOP_DEFAULT,

    CYG_SERIAL_PARITY_DEFAULT,

    CYG_SERIAL_WORD_LENGTH_DEFAULT,

    CYG_SERIAL_FLAGS_DEFAULT,

    MCF5272_uart_out_buf0, sizeof(MCF5272_uart_out_buf0),

    MCF5272_uart_in_buf0, sizeof(MCF5272_uart_in_buf0)

);

#else

/* Don't use interrupt processing for the UART. */

static SERIAL_CHANNEL(

    MCF5272_uart_channel_0,

    MCF5272_uart_funs,

    MCF5272_uart_channel_info_0,

    CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_MCF5272_UART_CHANNEL0_BAUD),

    CYG_SERIAL_STOP_DEFAULT,

    CYG_SERIAL_PARITY_DEFAULT,

    CYG_SERIAL_WORD_LENGTH_DEFAULT,

    CYG_SERIAL_FLAGS_DEFAULT

);

#endif

DEVTAB_ENTRY(

    MCF5272_uart_io0,

    CYGDAT_IO_SERIAL_MCF5272_UART_CHANNEL0_NAME,

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

    &cyg_io_serial_devio,    // The table of I/O functions.

    MCF5272_uart_init,       // UART initialization function.

    MCF5272_uart_lookup,     // The UART lookup function. This function typically sets

                             // up the device for actual use, turing on interrupts, configuring the port, etc.

    &MCF5272_uart_channel_0

);

#endif //  CYGNUM_IO_SERIAL_MCF5272_UART_CHANNEL0

/* Definition for channel 1 UART configuration. */

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

#ifdef CYGPKG_IO_SERIAL_MCF5272_UART_CHANNEL1

/* Data structure contains

   channel informtion.

 */

static MCF5272_uart_info_t MCF5272_uart_channel_info_1;

/* If the channel buffer size is zero, do not include interrupt UART processing */

#if CYGNUM_IO_SERIAL_MCF5272_UART_CHANNEL1_BUFSIZE > 0

/*      Allocated receive and transmit buffer.   The size of the buffer  is */

/* configured by the configtool.                                            */

static unsigned char MCF5272_uart_out_buf1[CYGNUM_IO_SERIAL_MCF5272_UART_CHANNEL1_BUFSIZE];

static unsigned char MCF5272_uart_in_buf1[CYGNUM_IO_SERIAL_MCF5272_UART_CHANNEL1_BUFSIZE];

/*      Channel function table.   We register  the UART  functions here  so */

/* that uppper serial drivers can call the serial driver's routines.        */

static SERIAL_CHANNEL_USING_INTERRUPTS(

    MCF5272_uart_channel_1,

    MCF5272_uart_funs,

    MCF5272_uart_channel_info_1,

    CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_MCF5272_UART_CHANNEL1_BAUD),

    CYG_SERIAL_STOP_DEFAULT,

    CYG_SERIAL_PARITY_DEFAULT,

    CYG_SERIAL_WORD_LENGTH_DEFAULT,

    CYG_SERIAL_FLAGS_DEFAULT,

    MCF5272_uart_out_buf1, sizeof(MCF5272_uart_out_buf1),

    MCF5272_uart_in_buf1, sizeof(MCF5272_uart_in_buf1)

);

#else

static SERIAL_CHANNEL(MCF5272_uart_channel_1,

                      MCF5272_uart_funs,

                      MCF5272_uart_channel_info_1,

                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_MCF5272_UART_CHANNEL0_BAUD),

                      CYG_SERIAL_STOP_DEFAULT,

                      CYG_SERIAL_PARITY_DEFAULT,

                      CYG_SERIAL_WORD_LENGTH_DEFAULT,

                      CYG_SERIAL_FLAGS_DEFAULT

    );

#endif

DEVTAB_ENTRY(

    MCF5272_uart_io1,

    CYGDAT_IO_SERIAL_MCF5272_UART_CHANNEL1_NAME,

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

    &cyg_io_serial_devio,  // The table of I/O functions.

    MCF5272_uart_init,     // UART initialization function.

    MCF5272_uart_lookup,   // The UART lookup function. This function typically sets

                           // up the device for actual use, turing on interrupts, configuring the port, etc.

    &MCF5272_uart_channel_1

);

#endif //  CYGNUM_IO_SERIAL_MCF5272_UART_CHANNEL1

/* Definition of macros that access the UART's SIM registers */

/* Read from a register */

#define MCF5272_UART_WRITE(_addr_,_value_) \

   *((volatile CYG_BYTE*)&(_addr_)) = (CYG_BYTE)(_value_)

/* Write to a register */

#define MCF5272_UART_READ(_addr_) \

   *(volatile CYG_BYTE*)&(_addr_)

/* Function Prototypes */

/* =================== */

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

static bool MCF5272_uart_config_port(serial_channel*, cyg_serial_info_t*);

static void MCF5272_uart_start_xmit(serial_channel*);

/* Baudrate conversion table. */

static unsigned long baud_rates_table[]=

{

    0,

    50,     // CYGNUM_SERIAL_BAUD_50 = 1

    75,     // CYGNUM_SERIAL_BAUD_75

    110,    // CYGNUM_SERIAL_BAUD_110

    134,    // CYGNUM_SERIAL_BAUD_134_5

    150,    // CYGNUM_SERIAL_BAUD_150

    200,    // CYGNUM_SERIAL_BAUD_200

    300,    // CYGNUM_SERIAL_BAUD_300

    600,    // CYGNUM_SERIAL_BAUD_600

    1200,   // CYGNUM_SERIAL_BAUD_1200

    1800,   // CYGNUM_SERIAL_BAUD_1800

    2400,   // CYGNUM_SERIAL_BAUD_2400

    3600,   // CYGNUM_SERIAL_BAUD_3600

    4800,   // CYGNUM_SERIAL_BAUD_4800

    7200,   // CYGNUM_SERIAL_BAUD_7200

    9600,   // CYGNUM_SERIAL_BAUD_9600

    14400,  // CYGNUM_SERIAL_BAUD_14400

    19200,  // CYGNUM_SERIAL_BAUD_19200

    38400,  // CYGNUM_SERIAL_BAUD_38400

    57600,  // CYGNUM_SERIAL_BAUD_57600

    115200, // CYGNUM_SERIAL_BAUD_115200

    230400  // CYGNUM_SERIAL_BAUD_230400

};

/*      The table contains  divers  to  divide  the  clock  to  configre  a */

/* approppriate for the UART.                                               */

static unsigned long dividers_table[]=

{

    0,

    46080,   // 50

    30720,   // 75

    20945,   // 110

    17130,   // 134_5

    15360,   // 150

    11520,   // 200

    7680,    // 300

    3840,    // 600

    1920,    // 1200

    1280,    // 1800

    960,     // 2400

    640,     // 3600

    480,     // 4800

    320,     // 7200

    240,     // 9600

    160,     // 14400

    120,     // 19200

    60,      // 38400

    40,      // 57600

    20,      // 115200

    10       // 230400

};

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

 MCF5272_uart_init() - This routine is called during bootstrap to set up the

                       UART driver.

 INPUT:

    Pointer to the the device table.

 RETURN:

    Returns true if the initialization is successful. Otherwise, it retuns false

*/

static bool MCF5272_uart_init(struct cyg_devtab_entry * tab)

{

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

    MCF5272_uart_info_t *MCF5272_uart_chan = (MCF5272_uart_info_t *)chan->dev_priv;

    #ifdef CYGPKG_IO_SERIAL_MCF5272_UART_CHANNEL0

    /*   Instantiation of the  UART channel  0 data  strucutre.  This  data */

    /* structure contains channel information.                              */

    if (strcmp(tab->name, CYGDAT_IO_SERIAL_MCF5272_UART_CHANNEL0_NAME) == 0)

    {

        /*   Initiliaze the UART information data to all zeros.             */

        memset(MCF5272_uart_chan, sizeof(MCF5272_uart_info_t), 0);

        /*   Set the base  address of the  UART registers to  differentiate */

        /* itself from the different regusters for the other UART port.     */

        MCF5272_uart_chan->base = (mcf5272_sim_uart_t*)&MCF5272_SIM->uart[0];

        /*   Set the UART interrupt vector number.                          */

        MCF5272_uart_chan->uart_vector = CYGNUM_HAL_VECTOR_UART1;

        /*   Set the autobaud state to idle.                                */

        MCF5272_uart_chan->autobaud_state = AB_IDLE;

        /* Initilize the UART 0 output pins */

        MCF5272_SIM->gpio.pbcnt =  MCF5272_GPIO_PBCNT_URT0_EN |

            ((MCF5272_SIM->gpio.pbcnt) & ~MCF5272_GPIO_PBCNT_URT0_MSK);

    }

    #endif

    #ifdef CYGPKG_IO_SERIAL_MCF5272_UART_CHANNEL1

    /* Instantiation of the UART channel 1 data strucutre. This data structure contains

       channel information.

     */

    if (strcmp(tab->name, CYGDAT_IO_SERIAL_MCF5272_UART_CHANNEL1_NAME) == 0)

    {

        /*   Initiliaze the UART information data to all zeros.             */

        memset(MCF5272_uart_chan, sizeof(MCF5272_uart_info_t), 0);

        /*   Set the base  address of the  UART registers to  differentiate */

        /* itself from the different regusters for the other UART port.     */

        MCF5272_uart_chan->base = (mcf5272_sim_uart_t*)&MCF5272_SIM->uart[1];

         /*   Set the UART interrupt vector number.                          */

        MCF5272_uart_chan->uart_vector = CYGNUM_HAL_VECTOR_UART2;

        /*   Set the autobaud state to idle.                                */

        MCF5272_uart_chan->autobaud_state = AB_IDLE;

        /* Initilize the UART 1 output pins */

        MCF5272_SIM->gpio.pdcnt =  MCF5272_GPIO_PDCNT_URT1_EN |

            ((MCF5272_SIM->gpio.pdcnt) & ~MCF5272_GPIO_PDCNT_URT1_MSK);

    }

    #endif

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

        /*   If the the buffer is greater  than zero, then the driver  will */

        /* use  interrupt  driven  I/O.   Hence,  the  driver  creates   an */

        /* interrupt context for the UART device.                           */

        cyg_drv_interrupt_create(MCF5272_uart_chan->uart_vector,

                                 MCF5272_UART_PRIORITY_LEVEL,           // Priority - Level 2

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

                                 MCF5272_uart_ISR,

                                 MCF5272_uart_DSR,

                                 &MCF5272_uart_chan->serial_interrupt_handle,

                                 &MCF5272_uart_chan->serial_interrupt);

        cyg_drv_interrupt_attach(MCF5272_uart_chan->serial_interrupt_handle);

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

    }

    // Configure Serial device.

    return(MCF5272_uart_config_port(chan, &chan->config));

}

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

 MCF5272_uart_config_port() - Configure the UART port.

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

 INPUT:

    chan        - The channel information

    new_confg   - The port configuration which include the desired baud rate, etc.

 RETURN:

    Returns true if the port configuration is successful. Otherwise, it retuns false

 */

static bool MCF5272_uart_config_port(serial_channel *chan,

                                     cyg_serial_info_t *new_config)

{

    MCF5272_uart_info_t * port = (MCF5272_uart_info_t *) chan->dev_priv;

    uint8 mode_reg = 0;

    uint32 ubgs;

    unsigned int baud_divisor;

    /*   Get the  divisor  from  the  baudrate  table  which  will  use  to */

    /* configure the port's baud rate.                                      */

    baud_divisor = baud_rates_table[new_config->baud];

    /*   If the divisor is zeor, we dont' configure the port.               */

    if (baud_divisor == 0) return false;

    /*   Save the configuration value for later use.                        */

    port->config = *new_config;

    /*   We first write the reset values into the device and then configure */

    /* the device the we way we want to use it.                             */

        /* Reset Transmitter */

    MCF5272_UART_WRITE(port->base->ucr, MCF5272_UART_UCR_RESET_TX);

        /* Reset Receiver */

    MCF5272_UART_WRITE(port->base->ucr, MCF5272_UART_UCR_RESET_RX);

        /* Reset Mode Register */

    MCF5272_UART_WRITE(port->base->ucr, MCF5272_UART_UCR_RESET_MR);

    /* Translate the parity configuration to UART mode bits. */

    switch(port->config.parity)

    {

    default:

    case CYGNUM_SERIAL_PARITY_NONE:

        mode_reg = 0 | MCF5272_UART_UMR1_PM_NONE;

        break;

    case CYGNUM_SERIAL_PARITY_EVEN:

        mode_reg = 0 | MCF5272_UART_UMR1_PM_EVEN;

        break;

    case CYGNUM_SERIAL_PARITY_ODD:

        mode_reg = 0 | MCF5272_UART_UMR1_PM_ODD;

        break;

    case CYGNUM_SERIAL_PARITY_MARK:

        mode_reg = 0 | MCF5272_UART_UMR1_PM_FORCE_HI;

        break;

    case CYGNUM_SERIAL_PARITY_SPACE:

        mode_reg = 0 | MCF5272_UART_UMR1_PM_FORCE_LO;

        break;

    }

    /* Translate the number of bits per character configuration to UART mode bits. */

    switch(port->config.word_length)

    {

    case CYGNUM_SERIAL_WORD_LENGTH_5:

        mode_reg |= MCF5272_UART_UMR1_BC_5;

        break;

    case CYGNUM_SERIAL_WORD_LENGTH_6:

        mode_reg |= MCF5272_UART_UMR1_BC_6;

        break;

    case CYGNUM_SERIAL_WORD_LENGTH_7:

        mode_reg |= MCF5272_UART_UMR1_BC_7;

        break;

    default:

    case CYGNUM_SERIAL_WORD_LENGTH_8:

        mode_reg |= MCF5272_UART_UMR1_BC_8;

        break;

    }

        /* Configure the parity and the bits per character */

    MCF5272_UART_WRITE(port->base->umr, mode_reg);

    /* Translate the stop bit length to UART mode bits. */

    switch(port->config.stop)

    {

    default:

    case CYGNUM_SERIAL_STOP_1:

        mode_reg = MCF5272_UART_UMR2_STOP_BITS_1;

        break;

    case CYGNUM_SERIAL_STOP_1_5:

        mode_reg = MCF5272_UART_UMR2_STOP_BITS_15;

        break;

    case CYGNUM_SERIAL_STOP_2:

        mode_reg = MCF5272_UART_UMR2_STOP_BITS_2;

        break;

    }

        /* No echo or loopback */

    MCF5272_UART_WRITE(port->base->umr, 0 | MCF5272_UART_UMR2_CM_NORMAL | mode_reg);

        /* Set Rx and Tx baud by timer */

    MCF5272_UART_WRITE(port->base->ucr, 0 | MCF5272_UART_UCSR_RCS(0xD) |

                       MCF5272_UART_UCSR_TCS(0xD));

        /* Mask all USART interrupts */

    MCF5272_UART_WRITE(port->base->uisr_uimr, 0);

        /* Calculate baud settings */

    ubgs = (uint16)((CYGHWR_HAL_SYSTEM_CLOCK_MHZ*1000000)/

                    (baud_divisor * 32));

    /*   Program the baud settings to the device.                           */

        MCF5272_UART_WRITE(port->base->udu, (uint8)((ubgs & 0xFF00) >> 8));

        MCF5272_UART_WRITE(port->base->udl, (uint8)(ubgs & 0x00FF));

        /* Enable receiver and transmitter */

    MCF5272_UART_WRITE(port->base->ucr, 0 | MCF5272_UART_UCR_TXRXEN);

    /* Enable both transmit and receive interrupt. */

    port->imr_mirror = MCF5272_UART_UIMR_TXRDY | MCF5272_UART_UIMR_FFULL |

                       MCF5272_UART_UIMR_DB;

    MCF5272_UART_WRITE(port->base->uisr_uimr, port->imr_mirror);

    return true; /* Returns true to indicate a successful configuration */

}

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

 MCF5272_uart_lookup() - This routine is called when the device is "looked" up

                        (i.e. attached)

 INPUT:

    tab - pointer to a pointer of the device table

    sub_tab - Pointer to the sub device table.

    name - name of the device

 RETURN:

    always return ENOERR

*/

static Cyg_ErrNo MCF5272_uart_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;

}

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

 MCF5272_uart_putc() - Send a character to the device output buffer.

 INPUT:

    chan - pointer to the serial private data.

    c    - the character to output

 RETURN:

    'true' if character is sent to device, return 'false' when we've

    ran out of buffer space in the device itself.

*/

static bool MCF5272_uart_putc(serial_channel *chan, unsigned char c)

{

    CYG_INTERRUPT_STATE int_state;

    MCF5272_uart_info_t *port = (MCF5272_uart_info_t *)chan->dev_priv;

    /* Make sure the transmitter is not full. If it is full, return false. */

    if  (!(MCF5272_UART_READ(port->base->usr_ucsr) & MCF5272_UART_USR_TXRDY))

        return false;

    /* Enable transmit interrupt. */

    HAL_DISABLE_INTERRUPTS(int_state);

    port->imr_mirror |= MCF5272_UART_UIMR_TXRDY;

    MCF5272_UART_WRITE(port->base->uisr_uimr, port->imr_mirror);

    HAL_RESTORE_INTERRUPTS(int_state);

    /* Enable the UART transmit. */

    MCF5272_UART_WRITE(port->base->ucr, MCF5272_UART_UCR_TXRXEN);

        /* Send the character */

    MCF5272_UART_WRITE(port->base->urb_utb, c);

        return true ;

}

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

 MCF5272_uart_getc() - Fetch a character from the device input bufferand return it to the alling

                       routine. Wait until there is a character ready.

 INPUT:

    chan - pointer to the serial private data.

 RETURN:

    the character read from the UART.

 */

static unsigned char MCF5272_uart_getc(serial_channel *chan)

{

    MCF5272_uart_info_t * port = (MCF5272_uart_info_t *)chan->dev_priv;

    /* Wait until character has been received */

        while (!(MCF5272_UART_READ(port->base->usr_ucsr) & MCF5272_UART_USR_RXRDY))

    {

        diag_printf("ready poll");

    }

    /* Read the character from the FIFO queue. */

    return MCF5272_UART_READ(port->base->urf);

}

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

 MCF5272_uart_set_config() - Set up the device characteristics; baud rate, etc.

 INPUT:

    chan - pointer to the serial private data.

    key  - configuration key (command).

    xbuf - pointer to the configuration buffer

    len  - the length of the configuration buffer

 RETURN:

    NOERR - If the configuration is successful

    EINVAL -  If the argument is invalid

*/

Cyg_ErrNo MCF5272_uart_set_config(serial_channel *chan, cyg_uint32 key,

                            const void *xbuf, cyg_uint32 *len)

{

    cyg_serial_info_t *config = (cyg_serial_info_t *)xbuf;

    MCF5272_uart_info_t * port = (MCF5272_uart_info_t *) chan->dev_priv;

    switch (key) {

    case CYG_IO_SET_CONFIG_SERIAL_INFO:

      {

          /* Set serial configuration. */

              if ( *len < sizeof(cyg_serial_info_t) ) {

              return EINVAL;

          }

          *len = sizeof(cyg_serial_info_t);

          if (!MCF5272_uart_config_port(chan, config))

              return EINVAL;

      }

      break;

    case CYG_IO_GET_CONFIG_SERIAL_INFO:

        // Retrieve UART configuration

        *config = port->config;

        break;

    default:

        return EINVAL;

    }

    return ENOERR;

}

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

  MCF5272_uart_start_xmit() - Enable the transmitter on the device.

  INPUT:

    chan - pointer to the serial private data.

*/

static void MCF5272_uart_start_xmit(serial_channel *chan)

{

    CYG_INTERRUPT_STATE int_state;

    MCF5272_uart_info_t * port = (MCF5272_uart_info_t *) chan->dev_priv;

    /* Enable the UART transmit. */

    MCF5272_UART_WRITE(port->base->ucr, MCF5272_UART_UCR_TXEN);

    /* Enable transmit interrupt */

    HAL_DISABLE_INTERRUPTS(int_state);

    port->imr_mirror |= MCF5272_UART_UIMR_TXRDY;

    MCF5272_UART_WRITE(port->base->uisr_uimr, port->imr_mirror);

    HAL_RESTORE_INTERRUPTS(int_state);

}

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

 MCF5272_uart_stop_xmit() - Disable the transmitter on the device

 INPUT:

    chan - pointer to the serial private data.

*/

static void MCF5272_uart_stop_xmit(serial_channel * chan)

{

   CYG_INTERRUPT_STATE int_state;

   MCF5272_uart_info_t * port = (MCF5272_uart_info_t *) chan->dev_priv;

   /* Disable transmit interrupt */

   HAL_DISABLE_INTERRUPTS(int_state);

   port->imr_mirror &= ~MCF5272_UART_UIMR_TXRDY;

   MCF5272_UART_WRITE(port->base->uisr_uimr, port->imr_mirror);

   HAL_RESTORE_INTERRUPTS(int_state);

   /* Disable the UART transmit.

      !!!!!!!!!!!!!

      !!!WARNING!!!

      !!!!!!!!!!!!!

      If the transmit the disabe