ser_mcf5272_uart.c

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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
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// 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/
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//####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