gps4020_serial.c

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//==========================================================================
//
//      io/serial/arm/gps4020_serial.c
//
//      GPS4020 Serial I/O Interface Module
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
// Copyright (C) 2003 Gary Thomas
//
// 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####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):   gthomas
// Contributors:  gthomas
// Date:        1999-02-04
// Purpose:     GPS4020 Serial I/O module
// Description: 
//
//####DESCRIPTIONEND####
//
//==========================================================================

#include <pkgconf/system.h>
#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/io/serial.h>
#include <cyg/infra/diag.h>
#include <cyg/hal/hal_if.h>

#include <cyg/hal/gps4020.h>  // Hardware definitions

static short select_word_length[] = {
    -1,            // 5 bits / word (char)
    -1,            // 6 bits / word
    SMR_LENGTH_7,  // 7 bits/word
    SMR_LENGTH_8   // 8 bits/word
};

static short select_stop_bits[] = {
    -1,
    SMR_STOP_1,     // 1 stop bit
    -1,             // 1.5 stop bit
    SMR_STOP_2      // 2 stop bits
};

static short select_parity[] = {
    SMR_PARITY_OFF,                // No parity
    SMR_PARITY_ON|SMR_PARITY_EVEN, // Even parity
    SMR_PARITY_ON|SMR_PARITY_ODD,  // Odd parity
    -1,                            // Mark parity
    -1,                            // Space parity
};

// Baud rate values, based on internal system (20MHz) clock
// Note: the extra *10 stuff is for rounding.  Since these values
// are so small, a little error here can make/break the calculation
#define BAUD_DIVISOR(baud) (((((20000000*10)/(16*baud))+5)/10)-1)
static cyg_int32 select_baud[] = {
    0,                    // Unused
    BAUD_DIVISOR(50),     // 50
    BAUD_DIVISOR(75),     // 75
    BAUD_DIVISOR(110),    // 110
    0,                    // 134.5
    BAUD_DIVISOR(150),    // 150
    BAUD_DIVISOR(200),    // 200
    BAUD_DIVISOR(300),    // 300
    BAUD_DIVISOR(600),    // 600
    BAUD_DIVISOR(1200),   // 1200
    BAUD_DIVISOR(1800),   // 1800
    BAUD_DIVISOR(2400),   // 2400
    BAUD_DIVISOR(3600),   // 3600
    BAUD_DIVISOR(4800),   // 4800
    BAUD_DIVISOR(7200),   // 7200
    BAUD_DIVISOR(9600),   // 9600
    BAUD_DIVISOR(14400),  // 14400
    BAUD_DIVISOR(19200),  // 19200
    BAUD_DIVISOR(38400),  // 38400
    BAUD_DIVISOR(57600),  // 57600
    BAUD_DIVISOR(115200), // 115200
    BAUD_DIVISOR(230400), // 230400
};

typedef struct gps4020_serial_info {
    CYG_ADDRWORD   regs;                      // Pointer to UART registers
    CYG_WORD       tx_int_num,                // Transmit interrupt number
                   rx_int_num,                // Receive interrupt number
                   ms_int_num;                // Modem Status Change interrupt number
    cyg_interrupt  serial_tx_interrupt, 
                   serial_rx_interrupt, 
                   serial_ms_interrupt;
    cyg_handle_t   serial_tx_interrupt_handle, 
                   serial_rx_interrupt_handle, 
                   serial_ms_interrupt_handle;
    bool           tx_enabled;
} gps4020_serial_info;

static bool gps4020_serial_init(struct cyg_devtab_entry *tab);
static bool gps4020_serial_putc(serial_channel *chan, unsigned char c);
static Cyg_ErrNo gps4020_serial_lookup(struct cyg_devtab_entry **tab, 
                                   struct cyg_devtab_entry *sub_tab,
                                   const char *name);
static unsigned char gps4020_serial_getc(serial_channel *chan);
static Cyg_ErrNo gps4020_serial_set_config(serial_channel *chan, cyg_uint32 key,
                                           const void *xbuf, cyg_uint32 *len);
static void gps4020_serial_start_xmit(serial_channel *chan);
static void gps4020_serial_stop_xmit(serial_channel *chan);

static cyg_uint32 gps4020_serial_tx_ISR(cyg_vector_t vector, cyg_addrword_t data);
static void       gps4020_serial_tx_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);
static cyg_uint32 gps4020_serial_rx_ISR(cyg_vector_t vector, cyg_addrword_t data);
static void       gps4020_serial_rx_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);
#if 0 // FIXME - handle modem & errors
static cyg_uint32 gps4020_serial_ms_ISR(cyg_vector_t vector, cyg_addrword_t data);
static void       gps4020_serial_ms_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);
#endif

static SERIAL_FUNS(gps4020_serial_funs, 
                   gps4020_serial_putc, 
                   gps4020_serial_getc,
                   gps4020_serial_set_config,
                   gps4020_serial_start_xmit,
                   gps4020_serial_stop_xmit
    );

#ifdef CYGPKG_IO_SERIAL_ARM_GPS4020_SERIAL1
static gps4020_serial_info gps4020_serial_info1 = {GPS4020_UART1, // Data register
                                                   CYGNUM_HAL_INTERRUPT_UART1_TX,  // Tx interrupt
                                                   CYGNUM_HAL_INTERRUPT_UART1_RX,  // Rx interrupt
                                                   CYGNUM_HAL_INTERRUPT_UART1_ERR, // Modem & Error interrupt
                                                  };
#if CYGNUM_IO_SERIAL_ARM_GPS4020_SERIAL1_BUFSIZE > 0
static unsigned char gps4020_serial_out_buf1[CYGNUM_IO_SERIAL_ARM_GPS4020_SERIAL1_BUFSIZE];
static unsigned char gps4020_serial_in_buf1[CYGNUM_IO_SERIAL_ARM_GPS4020_SERIAL1_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(gps4020_serial_channel1,
                                       gps4020_serial_funs, 
                                       gps4020_serial_info1,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_GPS4020_SERIAL1_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &gps4020_serial_out_buf1[0], sizeof(gps4020_serial_out_buf1),
                                       &gps4020_serial_in_buf1[0], sizeof(gps4020_serial_in_buf1)
    );
#else
static SERIAL_CHANNEL(gps4020_serial_channel1,
                      gps4020_serial_funs, 
                      gps4020_serial_info1,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_GPS4020_SERIAL1_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif

DEVTAB_ENTRY(gps4020_serial_io1, 
             CYGDAT_IO_SERIAL_ARM_GPS4020_SERIAL1_NAME,
             0,                     // Does not depend on a lower level interface
             &cyg_io_serial_devio, 
             gps4020_serial_init, 
             gps4020_serial_lookup,     // Serial driver may need initializing
             &gps4020_serial_channel1
    );
#endif //  CYGPKG_IO_SERIAL_ARM_GPS4020_SERIAL2

#ifdef CYGPKG_IO_SERIAL_ARM_GPS4020_SERIAL2
static gps4020_serial_info gps4020_serial_info2 = {GPS4020_UART2, // Data register
                                                   CYGNUM_HAL_INTERRUPT_UART2_TX,  // Tx interrupt
                                                   CYGNUM_HAL_INTERRUPT_UART2_RX,  // Rx interrupt
                                                   CYGNUM_HAL_INTERRUPT_UART2_ERR, // Modem & Error interrupt
                                                  };
#if CYGNUM_IO_SERIAL_ARM_GPS4020_SERIAL2_BUFSIZE > 0
static unsigned char gps4020_serial_out_buf2[CYGNUM_IO_SERIAL_ARM_GPS4020_SERIAL2_BUFSIZE];
static unsigned char gps4020_serial_in_buf2[CYGNUM_IO_SERIAL_ARM_GPS4020_SERIAL2_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(gps4020_serial_channel2,
                                       gps4020_serial_funs, 
                                       gps4020_serial_info2,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_GPS4020_SERIAL2_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &gps4020_serial_out_buf2[0], sizeof(gps4020_serial_out_buf2),
                                       &gps4020_serial_in_buf2[0], sizeof(gps4020_serial_in_buf2)
    );
#else
static SERIAL_CHANNEL(gps4020_serial_channel2,
                      gps4020_serial_funs, 
                      gps4020_serial_info2,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_GPS4020_SERIAL2_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif