//==========================================================================////      io/serial/arm/pid_serial_with_ints.c////      ARM PID Serial I/O Interface Module (interrupt driven)////==========================================================================//####COPYRIGHTBEGIN####//// -------------------------------------------// The contents of this file are subject to the Cygnus eCos Public License// Version 1.0 (the "License"); you may not use this file except in// compliance with the License.  You may obtain a copy of the License at// http://sourceware.cygnus.com/ecos// // 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 Cygnus Operating System, released// September 30, 1998.// // The Initial Developer of the Original Code is Cygnus.  Portions created// by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions.  All Rights Reserved.// -------------------------------------------////####COPYRIGHTEND####//==========================================================================//#####DESCRIPTIONBEGIN####//// Author(s):   gthomas// Contributors:  gthomas// Date:        1999-02-04// Purpose:     PID 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_ARM_PID#include "pid_serial.h"extern void diag_printf(const char *fmt, ...);typedef struct pid_serial_info {    CYG_ADDRWORD   base;    CYG_WORD       int_num;    cyg_interrupt  serial_interrupt;    cyg_handle_t   serial_interrupt_handle;} pid_serial_info;static bool pid_serial_init(struct cyg_devtab_entry *tab);static bool pid_serial_putc(serial_channel *chan, unsigned char c);static Cyg_ErrNo pid_serial_lookup(struct cyg_devtab_entry **tab,                                    struct cyg_devtab_entry *sub_tab,                                   const char *name);static unsigned char pid_serial_getc(serial_channel *chan);static bool pid_serial_set_config(serial_channel *chan, cyg_serial_info_t *config);static void pid_serial_start_xmit(serial_channel *chan);static void pid_serial_stop_xmit(serial_channel *chan);static cyg_uint32 pid_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);static void       pid_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);static SERIAL_FUNS(pid_serial_funs,                    pid_serial_putc,                    pid_serial_getc,                   pid_serial_set_config,                   pid_serial_start_xmit,                   pid_serial_stop_xmit    );#ifdef CYGPKG_IO_SERIAL_ARM_PID_SERIAL0static pid_serial_info pid_serial_info0 = {0x0D800000, CYGNUM_HAL_INTERRUPT_SERIALA};#if CYGNUM_IO_SERIAL_ARM_PID_SERIAL0_BUFSIZE > 0static unsigned char pid_serial_out_buf0[CYGNUM_IO_SERIAL_ARM_PID_SERIAL0_BUFSIZE];static unsigned char pid_serial_in_buf0[CYGNUM_IO_SERIAL_ARM_PID_SERIAL0_BUFSIZE];static SERIAL_CHANNEL_USING_INTERRUPTS(pid_serial_channel0,                                       pid_serial_funs,                                        pid_serial_info0,                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_PID_SERIAL0_BAUD),                                       CYG_SERIAL_STOP_DEFAULT,                                       CYG_SERIAL_PARITY_DEFAULT,                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,                                       CYG_SERIAL_FLAGS_DEFAULT,                                       &pid_serial_out_buf0[0], sizeof(pid_serial_out_buf0),                                       &pid_serial_in_buf0[0], sizeof(pid_serial_in_buf0)    );#elsestatic SERIAL_CHANNEL(pid_serial_channel0,                      pid_serial_funs,                       pid_serial_info0,                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_PID_SERIAL0_BAUD),                      CYG_SERIAL_STOP_DEFAULT,                      CYG_SERIAL_PARITY_DEFAULT,                      CYG_SERIAL_WORD_LENGTH_DEFAULT,                      CYG_SERIAL_FLAGS_DEFAULT    );#endifDEVTAB_ENTRY(pid_serial_io0,              CYGDAT_IO_SERIAL_ARM_PID_SERIAL0_NAME,             0,                     // Does not depend on a lower level interface             &serial_devio,              pid_serial_init,              pid_serial_lookup,     // Serial driver may need initializing             &pid_serial_channel0    );#endif //  CYGPKG_IO_SERIAL_ARM_PID_SERIAL0#ifdef CYGPKG_IO_SERIAL_ARM_PID_SERIAL1static pid_serial_info pid_serial_info1 = {0x0D800020, CYGNUM_HAL_INTERRUPT_SERIALB};#if CYGNUM_IO_SERIAL_ARM_PID_SERIAL1_BUFSIZE > 0static unsigned char pid_serial_out_buf1[CYGNUM_IO_SERIAL_ARM_PID_SERIAL1_BUFSIZE];static unsigned char pid_serial_in_buf1[CYGNUM_IO_SERIAL_ARM_PID_SERIAL1_BUFSIZE];static SERIAL_CHANNEL_USING_INTERRUPTS(pid_serial_channel1,                                       pid_serial_funs,                                        pid_serial_info1,                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_PID_SERIAL1_BAUD),                                       CYG_SERIAL_STOP_DEFAULT,                                       CYG_SERIAL_PARITY_DEFAULT,                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,                                       CYG_SERIAL_FLAGS_DEFAULT,                                       &pid_serial_out_buf1[0], sizeof(pid_serial_out_buf1),                                       &pid_serial_in_buf1[0], sizeof(pid_serial_in_buf1)    );#elsestatic SERIAL_CHANNEL(pid_serial_channel1,                      pid_serial_funs,                       pid_serial_info1,                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_PID_SERIAL1_BAUD),                      CYG_SERIAL_STOP_DEFAULT,                      CYG_SERIAL_PARITY_DEFAULT,                      CYG_SERIAL_WORD_LENGTH_DEFAULT,                      CYG_SERIAL_FLAGS_DEFAULT    );#endifDEVTAB_ENTRY(pid_serial_io1,              CYGDAT_IO_SERIAL_ARM_PID_SERIAL1_NAME,             0,                     // Does not depend on a lower level interface             &serial_devio,              pid_serial_init,              pid_serial_lookup,     // Serial driver may need initializing             &pid_serial_channel1    );#endif //  CYGPKG_IO_SERIAL_ARM_PID_SERIAL1// Internal function to actually configure the hardware to desired baud rate, etc.static boolpid_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init){    pid_serial_info *pid_chan = (pid_serial_info *)chan->dev_priv;    volatile struct serial_port *port = (volatile struct serial_port *)pid_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 pid_serial_init(struct cyg_devtab_entry *tab){    serial_channel *chan = (serial_channel *)tab->priv;    pid_serial_info *pid_chan = (pid_serial_info *)chan->dev_priv;#ifdef CYGDBG_IO_INIT    diag_printf("PID SERIAL init - dev: %x.%d\n", pid_chan->base, pid_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(pid_chan->int_num,                                 99,                     // Priority - what goes here?                                 (cyg_addrword_t)chan,   //  Data item passed to interrupt handler                                 pid_serial_ISR,                                 pid_serial_DSR,                                 &pid_chan->serial_interrupt_handle,                                 &pid_chan->serial_interrupt);        cyg_drv_interrupt_attach(pid_chan->serial_interrupt_handle);        cyg_drv_interrupt_unmask(pid_chan->int_num);    }    pid_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 pid_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 boolpid_serial_putc(serial_channel *chan, unsigned char c){    pid_serial_info *pid_chan = (pid_serial_info *)chan->dev_priv;    volatile struct serial_port *port = (volatile struct serial_port *)pid_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 pid_serial_getc(serial_channel *chan){    unsigned char c;    pid_serial_info *pid_chan = (pid_serial_info *)chan->dev_priv;    volatile struct serial_port *port = (volatile struct serial_port *)pid_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 bool pid_serial_set_config(serial_channel *chan, cyg_serial_info_t *config){    return pid_serial_config_port(chan, config, false);}// Enable the transmitter on the devicestatic voidpid_serial_start_xmit(serial_channel *chan){    pid_serial_info *pid_chan = (pid_serial_info *)chan->dev_priv;    volatile struct serial_port *port = (volatile struct serial_port *)pid_chan->base;    port->ier |= IER_XMT;  // Enable xmit interrupt}// Disable the transmitter on the devicestatic void pid_serial_stop_xmit(serial_channel *chan){    pid_serial_info *pid_chan = (pid_serial_info *)chan->dev_priv;    volatile struct serial_port *port = (volatile struct serial_port *)pid_chan->base;    port->ier &= ~IER_XMT;  // Disable xmit interrupt}// Serial I/O - low level interrupt handler (ISR)static cyg_uint32 pid_serial_ISR(cyg_vector_t vector, cyg_addrword_t data){    serial_channel *chan = (serial_channel *)data;    pid_serial_info *pid_chan = (pid_serial_info *)chan->dev_priv;    cyg_drv_interrupt_mask(pid_chan->int_num);    cyg_drv_interrupt_acknowledge(pid_chan->int_num);    return CYG_ISR_CALL_DSR;  // Cause DSR to be run}// Serial I/O - high level interrupt handler (DSR)static void       pid_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data){    serial_channel *chan = (serial_channel *)data;    pid_serial_info *pid_chan = (pid_serial_info *)chan->dev_priv;    volatile struct serial_port *port = (volatile struct serial_port *)pid_chan->base;    unsigned char isr;    isr = port->isr;    if ((isr & 0x0E) == ISR_Tx) {        (chan->callbacks->xmt_char)(chan);    } else {        // Assume receive interrupt        (chan->callbacks->rcv_char)(chan, port->rhr);    }    cyg_drv_interrupt_unmask(pid_chan->int_num);}#endif