//==========================================================================////      io/serial/mips/vrc437x_serial.c////      Mips VRC437X 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####//==========================================================================//#####DESCRIPTIONBEGIN####//// Author(s):    gthomas// Contributors: gthomas// Date:         1999-04-15// Purpose:      VRC437X Serial I/O module (interrupt driven version)// 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>#ifdef CYGPKG_IO_SERIAL_MIPS_VRC437X#include "vrc437x_serial.h"#if defined(CYGPKG_HAL_MIPS_LSBFIRST)#define VRC437X_SCC_BASE 0xC1000000#elif defined(CYGPKG_HAL_MIPS_MSBFIRST)#define VRC437X_SCC_BASE 0xC1000003#else#error MIPS endianness not defined by configuration#endif#define VRC437X_SCC_INT  CYGNUM_HAL_INTERRUPT_DUART#define SCC_CHANNEL_A             4#define SCC_CHANNEL_B             0extern void diag_printf(const char *fmt, ...);typedef struct vrc437x_serial_info {    CYG_ADDRWORD   base;    unsigned char  regs[16];   // Known register state (since hardware is write-only!)} vrc437x_serial_info;static bool vrc437x_serial_init(struct cyg_devtab_entry *tab);static bool vrc437x_serial_putc(serial_channel *chan, unsigned char c);static Cyg_ErrNo vrc437x_serial_lookup(struct cyg_devtab_entry **tab,                                        struct cyg_devtab_entry *sub_tab,                                       const char *name);static unsigned char vrc437x_serial_getc(serial_channel *chan);static Cyg_ErrNo vrc437x_serial_set_config(serial_channel *chan, cyg_uint32 key,                                           const void *xbuf, cyg_uint32 *len);static void vrc437x_serial_start_xmit(serial_channel *chan);static void vrc437x_serial_stop_xmit(serial_channel *chan);static cyg_uint32 vrc437x_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);static void       vrc437x_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);static SERIAL_FUNS(vrc437x_serial_funs,                    vrc437x_serial_putc,                    vrc437x_serial_getc,                   vrc437x_serial_set_config,                   vrc437x_serial_start_xmit,                   vrc437x_serial_stop_xmit    );#ifdef CYGPKG_IO_SERIAL_MIPS_VRC437X_SERIAL0static vrc437x_serial_info vrc437x_serial_info0 = {VRC437X_SCC_BASE+SCC_CHANNEL_A};#if CYGNUM_IO_SERIAL_MIPS_VRC437X_SERIAL0_BUFSIZE > 0static unsigned char vrc437x_serial_out_buf0[CYGNUM_IO_SERIAL_MIPS_VRC437X_SERIAL0_BUFSIZE];static unsigned char vrc437x_serial_in_buf0[CYGNUM_IO_SERIAL_MIPS_VRC437X_SERIAL0_BUFSIZE];static SERIAL_CHANNEL_USING_INTERRUPTS(vrc437x_serial_channel0,                                       vrc437x_serial_funs,                                        vrc437x_serial_info0,                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_MIPS_VRC437X_SERIAL0_BAUD),                                       CYG_SERIAL_STOP_DEFAULT,                                       CYG_SERIAL_PARITY_DEFAULT,                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,                                       CYG_SERIAL_FLAGS_DEFAULT,                                       &vrc437x_serial_out_buf0[0], sizeof(vrc437x_serial_out_buf0),                                       &vrc437x_serial_in_buf0[0], sizeof(vrc437x_serial_in_buf0)    );#elsestatic SERIAL_CHANNEL(vrc437x_serial_channel0,                      vrc437x_serial_funs,                       vrc437x_serial_info0,                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_MIPS_VRC437X_SERIAL0_BAUD),                      CYG_SERIAL_STOP_DEFAULT,                      CYG_SERIAL_PARITY_DEFAULT,                      CYG_SERIAL_WORD_LENGTH_DEFAULT,                      CYG_SERIAL_FLAGS_DEFAULT    );#endifDEVTAB_ENTRY(vrc437x_serial_io0,              CYGDAT_IO_SERIAL_MIPS_VRC437X_SERIAL0_NAME,             0,                     // Does not depend on a lower level interface             &cyg_io_serial_devio,              vrc437x_serial_init,              vrc437x_serial_lookup,     // Serial driver may need initializing             &vrc437x_serial_channel0    );#endif //  CYGPKG_IO_SERIAL_MIPS_VRC437X_SERIAL0#ifdef CYGPKG_IO_SERIAL_MIPS_VRC437X_SERIAL1static vrc437x_serial_info vrc437x_serial_info1 = {VRC437X_SCC_BASE+SCC_CHANNEL_B};#if CYGNUM_IO_SERIAL_MIPS_VRC437X_SERIAL1_BUFSIZE > 0static unsigned char vrc437x_serial_out_buf1[CYGNUM_IO_SERIAL_MIPS_VRC437X_SERIAL1_BUFSIZE];static unsigned char vrc437x_serial_in_buf1[CYGNUM_IO_SERIAL_MIPS_VRC437X_SERIAL1_BUFSIZE];static SERIAL_CHANNEL_USING_INTERRUPTS(vrc437x_serial_channel1,                                       vrc437x_serial_funs,                                        vrc437x_serial_info1,                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_MIPS_VRC437X_SERIAL1_BAUD),                                       CYG_SERIAL_STOP_DEFAULT,                                       CYG_SERIAL_PARITY_DEFAULT,                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,                                       CYG_SERIAL_FLAGS_DEFAULT,                                       &vrc437x_serial_out_buf1[0], sizeof(vrc437x_serial_out_buf1),                                       &vrc437x_serial_in_buf1[0], sizeof(vrc437x_serial_in_buf1)    );#elsestatic SERIAL_CHANNEL(vrc437x_serial_channel1,                      vrc437x_serial_funs,                       vrc437x_serial_info1,                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_MIPS_VRC437X_SERIAL1_BAUD),                      CYG_SERIAL_STOP_DEFAULT,                      CYG_SERIAL_PARITY_DEFAULT,                      CYG_SERIAL_WORD_LENGTH_DEFAULT,                      CYG_SERIAL_FLAGS_DEFAULT    );#endifDEVTAB_ENTRY(vrc437x_serial_io1,              CYGDAT_IO_SERIAL_MIPS_VRC437X_SERIAL1_NAME,             0,                     // Does not depend on a lower level interface             &cyg_io_serial_devio,              vrc437x_serial_init,              vrc437x_serial_lookup,     // Serial driver may need initializing             &vrc437x_serial_channel1    );#endif //  CYGPKG_IO_SERIAL_MIPS_VRC437X_SERIAL1static cyg_interrupt  vrc437x_serial_interrupt;static cyg_handle_t   vrc437x_serial_interrupt_handle;// Table which maps hardware channels (A,B) to software onesstruct serial_channel *vrc437x_chans[] = {#ifdef CYGPKG_IO_SERIAL_MIPS_VRC437X_SERIAL0    // Hardware channel A    &vrc437x_serial_channel0,        #else    0,#endif#ifdef CYGPKG_IO_SERIAL_MIPS_VRC437X_SERIAL1    // Hardware channel B    &vrc437x_serial_channel1,#else    0,#endif};// Support functions which access the serial device.  Note that this chip requires// a substantial delay after each access. #define SCC_DELAY 100inline static voidscc_delay(void){    int i;    for (i = 0;  i < SCC_DELAY;  i++) ;}inline static voidscc_write_reg(volatile unsigned char *reg, unsigned char val){    scc_delay();    *reg = val;}inline static unsigned charscc_read_reg(volatile unsigned char *reg){    unsigned char val;    scc_delay();    val = *reg;    return (val);}inline static unsigned charscc_read_ctl(volatile struct serial_port *port, int reg){    if (reg != 0) {        scc_write_reg(&port->scc_ctl, reg);    }           return (scc_read_reg(&port->scc_ctl));}inline static voidscc_write_ctl(volatile struct serial_port *port, int reg, unsigned char val){    if (reg != 0) {        scc_write_reg(&port->scc_ctl, reg);    }           scc_write_reg(&port->scc_ctl, val);}inline static unsigned charscc_read_dat(volatile struct serial_port *port){