//==========================================================================////      io/serial/arm/cma230_serial.c////      Cogent CMA230 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:        1999-02-04// Purpose:     CMA230 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>#include <cyg/hal/hal_cma230.h>#include <cyg/infra/diag.h>#ifdef CYGPKG_IO_SERIAL_ARM_CMA230#include "cma230_serial.h"typedef struct cma230_serial_info {    CYG_ADDRWORD   base;    CYG_WORD       int_num;    cyg_interrupt  serial_interrupt;    cyg_handle_t   serial_interrupt_handle;} cma230_serial_info;static bool cma230_serial_init(struct cyg_devtab_entry *tab);static bool cma230_serial_putc(serial_channel *chan, unsigned char c);static Cyg_ErrNo cma230_serial_lookup(struct cyg_devtab_entry **tab,                                    struct cyg_devtab_entry *sub_tab,                                   const char *name);static unsigned char cma230_serial_getc(serial_channel *chan);static Cyg_ErrNo cma230_serial_set_config(serial_channel *chan, cyg_uint32 key,                                          const void *xbuf, cyg_uint32 *len);static void cma230_serial_start_xmit(serial_channel *chan);static void cma230_serial_stop_xmit(serial_channel *chan);static cyg_uint32 cma230_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);static void       cma230_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);static SERIAL_FUNS(cma230_serial_funs,                    cma230_serial_putc,                    cma230_serial_getc,                   cma230_serial_set_config,                   cma230_serial_start_xmit,                   cma230_serial_stop_xmit    );#ifdef CYGPKG_IO_SERIAL_ARM_CMA230_SERIAL_Astatic cma230_serial_info cma230_serial_info0 = {CMA101_DUARTA,                                                  CYGNUM_HAL_INTERRUPT_SERIAL_A};#if CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BUFSIZE > 0static unsigned char cma230_serial_out_buf0[CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BUFSIZE];static unsigned char cma230_serial_in_buf0[CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BUFSIZE];static SERIAL_CHANNEL_USING_INTERRUPTS(cma230_serial_channel0,                                       cma230_serial_funs,                                        cma230_serial_info0,                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BAUD),                                       CYG_SERIAL_STOP_DEFAULT,                                       CYG_SERIAL_PARITY_DEFAULT,                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,                                       CYG_SERIAL_FLAGS_DEFAULT,                                       &cma230_serial_out_buf0[0], sizeof(cma230_serial_out_buf0),                                       &cma230_serial_in_buf0[0], sizeof(cma230_serial_in_buf0)    );#elsestatic SERIAL_CHANNEL(cma230_serial_channel0,                      cma230_serial_funs,                       cma230_serial_info0,                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BAUD),                      CYG_SERIAL_STOP_DEFAULT,                      CYG_SERIAL_PARITY_DEFAULT,                      CYG_SERIAL_WORD_LENGTH_DEFAULT,                      CYG_SERIAL_FLAGS_DEFAULT    );#endifDEVTAB_ENTRY(cma230_serial_io0,              CYGDAT_IO_SERIAL_ARM_CMA230_SERIAL_A_NAME,             0,                     // Does not depend on a lower level interface             &cyg_io_serial_devio,              cma230_serial_init,              cma230_serial_lookup,     // Serial driver may need initializing             &cma230_serial_channel0    );#endif //  CYGPKG_IO_SERIAL_ARM_CMA230_SERIAL_A#ifdef CYGPKG_IO_SERIAL_ARM_CMA230_SERIAL_Bstatic cma230_serial_info cma230_serial_info1 = {CMA101_DUARTB,                                                 CYGNUM_HAL_INTERRUPT_SERIAL_B};#if CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BUFSIZE > 0static unsigned char cma230_serial_out_buf1[CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BUFSIZE];static unsigned char cma230_serial_in_buf1[CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BUFSIZE];static SERIAL_CHANNEL_USING_INTERRUPTS(cma230_serial_channel1,                                       cma230_serial_funs,                                        cma230_serial_info1,                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BAUD),                                       CYG_SERIAL_STOP_DEFAULT,                                       CYG_SERIAL_PARITY_DEFAULT,                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,                                       CYG_SERIAL_FLAGS_DEFAULT,                                       &cma230_serial_out_buf1[0], sizeof(cma230_serial_out_buf1),                                       &cma230_serial_in_buf1[0], sizeof(cma230_serial_in_buf1)    );#elsestatic SERIAL_CHANNEL(cma230_serial_channel1,                      cma230_serial_funs,                       cma230_serial_info1,                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BAUD),                      CYG_SERIAL_STOP_DEFAULT,                      CYG_SERIAL_PARITY_DEFAULT,                      CYG_SERIAL_WORD_LENGTH_DEFAULT,                      CYG_SERIAL_FLAGS_DEFAULT    );#endifDEVTAB_ENTRY(cma230_serial_io1,              CYGDAT_IO_SERIAL_ARM_CMA230_SERIAL_B_NAME,             0,                     // Does not depend on a lower level interface             &cyg_io_serial_devio,              cma230_serial_init,              cma230_serial_lookup,     // Serial driver may need initializing             &cma230_serial_channel1    );#endif //  CYGPKG_IO_SERIAL_ARM_CMA230_SERIAL_B// Internal function to actually configure the hardware to desired baud rate, etc.static boolcma230_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init){    cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;    volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;    unsigned short baud_divisor = select_baud[new_config->baud];    unsigned char _lcr, _ier;    if (baud_divisor == 0) return false;  // Invalid configuration    _ier = port->ier;    port->ier = 0;  // Disable port interrupts while changing hardware    _lcr = select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5] |         select_stop_bits[new_config->stop] |        select_parity[new_config->parity];    port->lcr = _lcr;    port->lcr |= LCR_DL;    port->mdl = baud_divisor >> 8;    port->ldl = baud_divisor & 0xFF;    port->lcr &= ~LCR_DL;    if (init) {        port->fcr = 0x07;  // Enable and clear FIFO        if (chan->out_cbuf.len != 0) {            port->ier = IER_RCV;        } else {            port->ier = 0;        }        port->mcr = MCR_INT|MCR_DTR|MCR_RTS;  // Master interrupt enable    } else {        port->ier = _ier;    }    if (new_config != &chan->config) {        chan->config = *new_config;    }    return true;}// Function to initialize the device.  Called at bootstrap time.static bool cma230_serial_init(struct cyg_devtab_entry *tab){    serial_channel *chan = (serial_channel *)tab->priv;    cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;#ifdef CYGDBG_IO_INIT    diag_printf("CMA230 SERIAL init - dev: %x.%d\n", cma230_chan->base, cma230_chan->int_num);#endif    (chan->callbacks->serial_init)(chan);  // Really only required for interrupt driven devices    if (chan->out_cbuf.len != 0) {        cyg_drv_interrupt_create(cma230_chan->int_num,                                 99,                     // Priority - what goes here?                                 (cyg_addrword_t)chan,   //  Data item passed to interrupt handler                                 cma230_serial_ISR,                                 cma230_serial_DSR,                                 &cma230_chan->serial_interrupt_handle,                                 &cma230_chan->serial_interrupt);        cyg_drv_interrupt_attach(cma230_chan->serial_interrupt_handle);        cyg_drv_interrupt_unmask(cma230_chan->int_num);    }    cma230_serial_config_port(chan, &chan->config, true);    return true;}// This routine is called when the device is "looked" up (i.e. attached)static Cyg_ErrNo cma230_serial_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;}// Send a character to the device output buffer.// Return 'true' if character is sent to devicestatic boolcma230_serial_putc(serial_channel *chan, unsigned char c){    cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;    volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;    if (port->lsr & LSR_THE) {// Transmit buffer is empty        port->thr = c;        return true;    } else {// No space        return false;    }}// Fetch a character from the device input buffer, waiting if necessarystatic unsigned char cma230_serial_getc(serial_channel *chan){    unsigned char c;    cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;    volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;    while ((port->lsr & LSR_RSR) == 0) ;   // Wait for char    c = port->rhr;    return c;}// Set up the device characteristics; baud rate, etc.static Cyg_ErrNocma230_serial_set_config(serial_channel *chan, cyg_uint32 key,                         const void *xbuf, cyg_uint32 *len){    switch (key) {    case CYG_IO_SET_CONFIG_SERIAL_INFO:      {        cyg_serial_info_t *config = (cyg_serial_info_t *)xbuf;        if ( *len < sizeof(cyg_serial_info_t) ) {            return -EINVAL;        }        *len = sizeof(cyg_serial_info_t);        if ( true != cma230_serial_config_port(chan, config, false) )            return -EINVAL;      }      break;    default:        return -EINVAL;    }    return ENOERR;}// Enable the transmitter on the devicestatic voidcma230_serial_start_xmit(serial_channel *chan){    cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;    volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;    port->ier |= IER_XMT;  // Enable xmit interrupt}// Disable the transmitter on the devicestatic void cma230_serial_stop_xmit(serial_channel *chan){    cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;    volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;    port->ier &= ~IER_XMT;  // Disable xmit interrupt}// Serial I/O - low level interrupt handler (ISR)static cyg_uint32 cma230_serial_ISR(cyg_vector_t vector, cyg_addrword_t data){    serial_channel *chan = (serial_channel *)data;    cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;    cyg_drv_interrupt_mask(cma230_chan->int_num);    cyg_drv_interrupt_acknowledge(cma230_chan->int_num);    return CYG_ISR_CALL_DSR;  // Cause DSR to be run}// Serial I/O - high level interrupt handler (DSR)static void       cma230_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data){    serial_channel *chan = (serial_channel *)data;    cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;    volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;    unsigned char isr;    isr = port->isr & 0x0E;    if (isr == ISR_Tx) {        (chan->callbacks->xmt_char)(chan);    } else if (isr == ISR_Rx) {        (chan->callbacks->rcv_char)(chan, port->rhr);    }    cyg_drv_interrupt_unmask(cma230_chan->int_num);}#endif