//==========================================================================////      io/serial/mips/vrc4373_serial.c////      Mips VRC4373 Serial I/O Interface Module (interrupt driven)////==========================================================================//####COPYRIGHTBEGIN####//                                                                          // -------------------------------------------                              // The contents of this file are subject to the Red Hat eCos Public License // Version 1.1 (the "License"); you may not use this file except in         // compliance with the License.  You may obtain a copy of the License at    // http://www.redhat.com/                                                   //                                                                          // Software distributed under the License is distributed on an "AS IS"      // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the // License for the specific language governing rights and limitations under // the License.                                                             //                                                                          // The Original Code is eCos - Embedded Configurable Operating System,      // released September 30, 1998.                                             //                                                                          // The Initial Developer of the Original Code is Red Hat.                   // Portions created by Red Hat are                                          // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             // All Rights Reserved.                                                     // -------------------------------------------                              //                                                                          //####COPYRIGHTEND####//==========================================================================//#####DESCRIPTIONBEGIN####//// Author(s):    gthomas// Contributors: gthomas// Date:         1999-04-15// Purpose:      VRC4373 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_VRC4373#include "vrc4373_serial.h"#if defined(CYGPKG_HAL_MIPS_LSBFIRST)#define VRC4373_SCC_BASE 0xC1000000#elif defined(CYGPKG_HAL_MIPS_MSBFIRST)#define VRC4373_SCC_BASE 0xC1000003#else#error MIPS endianness not defined by configuration#endif#define VRC4373_SCC_INT  CYGNUM_HAL_INTERRUPT_DUART#define SCC_CHANNEL_A             4#define SCC_CHANNEL_B             0extern void diag_printf(const char *fmt, ...);typedef struct vrc4373_serial_info {    CYG_ADDRWORD   base;    unsigned char  regs[16];   // Known register state (since hardware is write-only!)} vrc4373_serial_info;static bool vrc4373_serial_init(struct cyg_devtab_entry *tab);static bool vrc4373_serial_putc(serial_channel *chan, unsigned char c);static Cyg_ErrNo vrc4373_serial_lookup(struct cyg_devtab_entry **tab,                                        struct cyg_devtab_entry *sub_tab,                                       const char *name);static unsigned char vrc4373_serial_getc(serial_channel *chan);static bool vrc4373_serial_set_config(serial_channel *chan, cyg_serial_info_t *config);static void vrc4373_serial_start_xmit(serial_channel *chan);static void vrc4373_serial_stop_xmit(serial_channel *chan);static cyg_uint32 vrc4373_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);static void       vrc4373_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);static SERIAL_FUNS(vrc4373_serial_funs,                    vrc4373_serial_putc,                    vrc4373_serial_getc,                   vrc4373_serial_set_config,                   vrc4373_serial_start_xmit,                   vrc4373_serial_stop_xmit    );#ifdef CYGPKG_IO_SERIAL_MIPS_VRC4373_SERIAL0static vrc4373_serial_info vrc4373_serial_info0 = {VRC4373_SCC_BASE+SCC_CHANNEL_A};#if CYGNUM_IO_SERIAL_MIPS_VRC4373_SERIAL0_BUFSIZE > 0static unsigned char vrc4373_serial_out_buf0[CYGNUM_IO_SERIAL_MIPS_VRC4373_SERIAL0_BUFSIZE];static unsigned char vrc4373_serial_in_buf0[CYGNUM_IO_SERIAL_MIPS_VRC4373_SERIAL0_BUFSIZE];static SERIAL_CHANNEL_USING_INTERRUPTS(vrc4373_serial_channel0,                                       vrc4373_serial_funs,                                        vrc4373_serial_info0,                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_MIPS_VRC4373_SERIAL0_BAUD),                                       CYG_SERIAL_STOP_DEFAULT,                                       CYG_SERIAL_PARITY_DEFAULT,                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,                                       CYG_SERIAL_FLAGS_DEFAULT,                                       &vrc4373_serial_out_buf0[0], sizeof(vrc4373_serial_out_buf0),                                       &vrc4373_serial_in_buf0[0], sizeof(vrc4373_serial_in_buf0)    );#elsestatic SERIAL_CHANNEL(vrc4373_serial_channel0,                      vrc4373_serial_funs,                       vrc4373_serial_info0,                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_MIPS_VRC4373_SERIAL0_BAUD),                      CYG_SERIAL_STOP_DEFAULT,                      CYG_SERIAL_PARITY_DEFAULT,                      CYG_SERIAL_WORD_LENGTH_DEFAULT,                      CYG_SERIAL_FLAGS_DEFAULT    );#endifDEVTAB_ENTRY(vrc4373_serial_io0,              CYGDAT_IO_SERIAL_MIPS_VRC4373_SERIAL0_NAME,             0,                     // Does not depend on a lower level interface             &cyg_io_serial_devio,              vrc4373_serial_init,              vrc4373_serial_lookup,     // Serial driver may need initializing             &vrc4373_serial_channel0    );#endif //  CYGPKG_IO_SERIAL_MIPS_VRC4373_SERIAL0#ifdef CYGPKG_IO_SERIAL_MIPS_VRC4373_SERIAL1static vrc4373_serial_info vrc4373_serial_info1 = {VRC4373_SCC_BASE+SCC_CHANNEL_B};#if CYGNUM_IO_SERIAL_MIPS_VRC4373_SERIAL1_BUFSIZE > 0static unsigned char vrc4373_serial_out_buf1[CYGNUM_IO_SERIAL_MIPS_VRC4373_SERIAL1_BUFSIZE];static unsigned char vrc4373_serial_in_buf1[CYGNUM_IO_SERIAL_MIPS_VRC4373_SERIAL1_BUFSIZE];static SERIAL_CHANNEL_USING_INTERRUPTS(vrc4373_serial_channel1,                                       vrc4373_serial_funs,                                        vrc4373_serial_info1,                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_MIPS_VRC4373_SERIAL1_BAUD),                                       CYG_SERIAL_STOP_DEFAULT,                                       CYG_SERIAL_PARITY_DEFAULT,                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,                                       CYG_SERIAL_FLAGS_DEFAULT,                                       &vrc4373_serial_out_buf1[0], sizeof(vrc4373_serial_out_buf1),                                       &vrc4373_serial_in_buf1[0], sizeof(vrc4373_serial_in_buf1)    );#elsestatic SERIAL_CHANNEL(vrc4373_serial_channel1,                      vrc4373_serial_funs,                       vrc4373_serial_info1,                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_MIPS_VRC4373_SERIAL1_BAUD),                      CYG_SERIAL_STOP_DEFAULT,                      CYG_SERIAL_PARITY_DEFAULT,                      CYG_SERIAL_WORD_LENGTH_DEFAULT,                      CYG_SERIAL_FLAGS_DEFAULT    );#endifDEVTAB_ENTRY(vrc4373_serial_io1,              CYGDAT_IO_SERIAL_MIPS_VRC4373_SERIAL1_NAME,             0,                     // Does not depend on a lower level interface             &cyg_io_serial_devio,              vrc4373_serial_init,              vrc4373_serial_lookup,     // Serial driver may need initializing             &vrc4373_serial_channel1    );#endif //  CYGPKG_IO_SERIAL_MIPS_VRC4373_SERIAL1static cyg_interrupt  vrc4373_serial_interrupt;static cyg_handle_t   vrc4373_serial_interrupt_handle;// Table which maps hardware channels (A,B) to software onesstruct serial_channel *vrc4373_chans[] = {#ifdef CYGPKG_IO_SERIAL_MIPS_VRC4373_SERIAL0    // Hardware channel A    &vrc4373_serial_channel0,        #else    0,#endif#ifdef CYGPKG_IO_SERIAL_MIPS_VRC4373_SERIAL1    // Hardware channel B    &vrc4373_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);}