//==========================================================================////      io/serial/i386/pc_serial.c////      i386 PC Serial I/O Interface Module (interrupt driven)//      for use with 8250s or 16550s.////==========================================================================//####COPYRIGHTBEGIN####//                                                                          // -------------------------------------------                              // The contents of this file are subject to the Red Hat 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       // 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, pjo// Date:        1999-02-04// Purpose:     AEB-1 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/infra/diag.h>#ifdef CYGPKG_IO_SERIAL_I386_PC#include "pc_serial.h"typedef struct pc_serial_info {    CYG_ADDRWORD   base;    CYG_WORD       int_num;    cyg_interrupt  serial_interrupt;    cyg_handle_t   serial_interrupt_handle;	enum		{	sNone = 0,					s8250,					s16450,					s16550,					s16550a				}	deviceType ;	unsigned char	_ier ;	unsigned char	charsInTransmitter ;} pc_serial_info;static bool pc_serial_init(struct cyg_devtab_entry *tab);static bool pc_serial_putc(serial_channel *chan, unsigned char c);static Cyg_ErrNo pc_serial_lookup(struct cyg_devtab_entry **tab,                                    struct cyg_devtab_entry *sub_tab,                                   const char *name);static unsigned char pc_serial_getc(serial_channel *chan);static bool pc_serial_set_config(serial_channel *chan, cyg_serial_info_t *config);static void pc_serial_start_xmit(serial_channel *chan);static void pc_serial_stop_xmit(serial_channel *chan);static cyg_uint32 pc_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);static void       pc_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);static SERIAL_FUNS(pc_serial_funs,                    pc_serial_putc,                    pc_serial_getc,                   pc_serial_set_config,                   pc_serial_start_xmit,                   pc_serial_stop_xmit    );#ifdef CYGPKG_IO_SERIAL_I386_PC_SERIAL0static pc_serial_info pc_serial_info0 = { CYGNUM_IO_SERIAL_I386_PC_SERIAL0_IOBASE,                                            CYGNUM_IO_SERIAL_I386_PC_SERIAL0_INT};#if CYGNUM_IO_SERIAL_I386_PC_SERIAL0_BUFSIZE > 0static unsigned char pc_serial_out_buf0[CYGNUM_IO_SERIAL_I386_PC_SERIAL0_BUFSIZE];static unsigned char pc_serial_in_buf0[CYGNUM_IO_SERIAL_I386_PC_SERIAL0_BUFSIZE];static SERIAL_CHANNEL_USING_INTERRUPTS(pc_serial_channel0,                                       pc_serial_funs,                                        pc_serial_info0,                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_I386_PC_SERIAL0_BAUD),                                       CYG_SERIAL_STOP_DEFAULT,                                       CYG_SERIAL_PARITY_DEFAULT,                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,                                       CYG_SERIAL_FLAGS_DEFAULT,                                       &pc_serial_out_buf0[0], sizeof(pc_serial_out_buf0),                                       &pc_serial_in_buf0[0], sizeof(pc_serial_in_buf0)    );#elsestatic SERIAL_CHANNEL(pc_serial_channel0,                      pc_serial_funs,                       pc_serial_info0,                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_I386_PC_SERIAL0_BAUD),                      CYG_SERIAL_STOP_DEFAULT,                      CYG_SERIAL_PARITY_DEFAULT,                      CYG_SERIAL_WORD_LENGTH_DEFAULT,                      CYG_SERIAL_FLAGS_DEFAULT    );#endifDEVTAB_ENTRY(pc_serial_io0,              CYGDAT_IO_SERIAL_I386_PC_SERIAL0_NAME,             0,                     // Does not depend on a lower level interface             &cyg_io_serial_devio,              pc_serial_init,              pc_serial_lookup,     // Serial driver may need initializing             &pc_serial_channel0    );#endif //  CYGPKG_IO_SERIAL_I386_PC_SERIAL0#ifdef CYGPKG_IO_SERIAL_I386_PC_SERIAL1static pc_serial_info pc_serial_info1 = { CYGNUM_IO_SERIAL_I386_PC_SERIAL1_IOBASE,                                            CYGNUM_IO_SERIAL_I386_PC_SERIAL1_INT};#if CYGNUM_IO_SERIAL_I386_PC_SERIAL1_BUFSIZE > 0static unsigned char pc_serial_out_buf1[CYGNUM_IO_SERIAL_I386_PC_SERIAL1_BUFSIZE];static unsigned char pc_serial_in_buf1[CYGNUM_IO_SERIAL_I386_PC_SERIAL1_BUFSIZE];static SERIAL_CHANNEL_USING_INTERRUPTS(pc_serial_channel1,                                       pc_serial_funs,                                        pc_serial_info1,                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_I386_PC_SERIAL1_BAUD),                                       CYG_SERIAL_STOP_DEFAULT,                                       CYG_SERIAL_PARITY_DEFAULT,                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,                                       CYG_SERIAL_FLAGS_DEFAULT,                                       &pc_serial_out_buf1[0], sizeof(pc_serial_out_buf1),                                       &pc_serial_in_buf1[0], sizeof(pc_serial_in_buf1)    );#elsestatic SERIAL_CHANNEL(pc_serial_channel1,                      pc_serial_funs,                       pc_serial_info1,                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_I386_PC_SERIAL1_BAUD),                      CYG_SERIAL_STOP_DEFAULT,                      CYG_SERIAL_PARITY_DEFAULT,                      CYG_SERIAL_WORD_LENGTH_DEFAULT,                      CYG_SERIAL_FLAGS_DEFAULT    );#endifDEVTAB_ENTRY(pc_serial_io1,              CYGDAT_IO_SERIAL_I386_PC_SERIAL1_NAME,             0,                     // Does not depend on a lower level interface             &cyg_io_serial_devio,              pc_serial_init,              pc_serial_lookup,     // Serial driver may need initializing             &pc_serial_channel1    );#endif //  CYGPKG_IO_SERIAL_I386_PC_SERIAL1void pc_outb(int port, int byte) ;int pc_inb(int port) ;// Internal function to actually configure the hardware to desired baud rate, etc.static bool pc_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init){    pc_serial_info * port = (pc_serial_info *) chan->dev_priv;    unsigned short baud_divisor = select_baud[new_config->baud];    unsigned char _lcr ;    if (baud_divisor == 0) return false;// Initialize the device, if necessary.  First, find out what kind of device//	it is.  Use a while() loop so that we can break to the next statement; //	otherwise we'd have an avalanche of if/else, which can become very//	difficult to understand.	while (init)	{	port->deviceType = sNone ;		pc_outb(port->base + MCR, MCR_LOOP) ;		if (pc_inb(port->base + MSR) & 0xF0)			break ;		pc_outb(port->base + MCR, MCR_LOOP | 0xF) ;		if ((pc_inb(port->base + MSR) & 0xF0) != 0xF0)			break;// So we have at least an 8250.		pc_outb(port->base + MCR, 0x00) ;		port->deviceType = s8250 ;// Check for a scratch register; scratch register indicates 16450 or above.		pc_outb(port->base + SCR, 0x55) ;		if (pc_inb(port->base + SCR) != 0x55)			break ;		pc_outb(port->base + SCR, 0xAA) ;		if (pc_inb(port->base + SCR) != 0xAA)			break;// Check for a FIFO		pc_outb(port->base + FCR, FCR_FE) ;		if ((pc_inb(port->base + ISR) & 0x80) == 0)			break ;		port->deviceType = s16550 ;	// Note! 16550 fifo's don't work!		if ((pc_inb(port->base + ISR) & 0x40) == 0)			break ;		port->deviceType = s16550a ; // But 16550A fifos do.		break;	}    port->_ier = pc_inb(port->base + IER);	pc_outb(port->base + 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];	pc_outb(port->base + LCR, _lcr | LCR_DL) ;	pc_outb(port->base + MDL, baud_divisor >> 8) ;	pc_outb(port->base + LDL, baud_divisor & 0xFF) ;	pc_outb(port->base + LCR, _lcr) ;    if (init)	{	if (port->deviceType == s16550a)			pc_outb(port->base + FCR, FCR_FE | FCR_RFR | FCR_TFR | FCR_RT14);		else			pc_outb(port->base + FCR, 0);        if (chan->out_cbuf.len != 0)			pc_outb(port->base + IER, IER_RCV) ;		else			pc_outb(port->base + IER, 0) ;//		port->_ier = MCR_INT | MCR_DTR | MCR_RTS ;//		port->_ier = IER_RCV | IER_LS | IER_MS ;		pc_outb(port->base + MCR, MCR_INT | MCR_DTR | MCR_RTS) ;		port->_ier = IER_RCV ;	}	pc_outb(port->base + IER, port->_ier) ;    if (new_config != &chan->config)		chan->config = *new_config;    return true;}// Function to initialize the device.  Called at bootstrap time.static bool pc_serial_init(struct cyg_devtab_entry * tab){    serial_channel *chan = (serial_channel *)tab->priv;    pc_serial_info *pc_chan = (pc_serial_info *)chan->dev_priv;#ifdef CYGDBG_IO_INIT    diag_printf("I386_PC SERIAL init - dev: %x.%d\n", pc_chan->base, pc_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(pc_chan->int_num,                                 99,                     // Priority - unused                                 (cyg_addrword_t)chan,   //  Data item passed to interrupt handler                                 pc_serial_ISR,                                 pc_serial_DSR,                                 &pc_chan->serial_interrupt_handle,                                 &pc_chan->serial_interrupt);        cyg_drv_interrupt_attach(pc_chan->serial_interrupt_handle);        cyg_drv_interrupt_unmask(pc_chan->int_num);    }    pc_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 pc_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 device, return 'false' when// we've ran out of buffer space in the device itself.static bool pc_serial_putc(serial_channel *chan, unsigned char c){	int x = 0 ;    pc_serial_info * port = (pc_serial_info *)chan->dev_priv;#if 0// Make sure the transmitter is empty.	if ((pc_inb(port->base + LSR) & LSR_THE) == 0)		return false ;#else        // There isn't a status for FIFO "not full" from the '550, so we have to        // keep track of it ourselves.	if ((pc_inb(port->base + LSR) & LSR_THE) == 0)	{	if ((port->deviceType == s16550a) &&			(port->charsInTransmitter++ < PC16550_FIFO_TX_LENGTH))		{	/* We're cool to keep sending characters. */		}		else			return false ;	}#endif	pc_outb(port->base + THR, c);	return true ;}// Fetch a character from the device input buffer, waiting if necessarystatic unsigned char pc_serial_getc(serial_channel *chan){    pc_serial_info * port = (pc_serial_info *)chan->dev_priv;	while ((pc_inb(port->base + LSR) & LSR_RSR) == 0)		;	return pc_inb(port->base + RHR) ;}// Set up the device characteristics; baud rate, etc.static bool pc_serial_set_config(serial_channel *chan, cyg_serial_info_t *config){    return pc_serial_config_port(chan, config, false);}// Enable the transmitter on the devicestatic void pc_serial_start_xmit(serial_channel *chan){    pc_serial_info * port = (pc_serial_info *) chan->dev_priv;    pc_outb(port->base + IER, port->_ier |= IER_XMT) ;}// Disable the transmitter on the devicestatic void pc_serial_stop_xmit(serial_channel * chan){	pc_serial_info * port = (pc_serial_info *) chan->dev_priv;	pc_outb(port->base + IER, port->_ier &= ~IER_XMT) ;}// Serial I/O - low level interrupt handler (ISR)static cyg_uint32 pc_serial_ISR(cyg_vector_t vector, cyg_addrword_t data){    serial_channel *chan = (serial_channel *) data;    pc_serial_info * port = (pc_serial_info *) chan->dev_priv;    cyg_drv_interrupt_mask(port->int_num);    cyg_drv_interrupt_acknowledge(port->int_num);    return CYG_ISR_CALL_DSR;  // Cause DSR to be run}// Serial I/O - high level interrupt handler (DSR)static void pc_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data){    serial_channel *chan = (serial_channel *)data;    pc_serial_info *port = (pc_serial_info *)chan->dev_priv;    unsigned char isr;    isr = pc_inb(port->base + ISR) & 0x0E;    if (isr == ISR_Tx)    {	port->charsInTransmitter = 0 ;    (chan->callbacks->xmt_char)(chan);    } else if (isr == ISR_Rx)    {        // If we've got s16550a, then read all the characters in the fifo.        while (pc_inb(port->base + LSR) & LSR_RSR)        {            char c = pc_inb(port->base + RHR);            (chan->callbacks->rcv_char)(chan, c);        }    }    cyg_drv_interrupt_unmask(port->int_num);}#endif