--- /dev/null
+/* Drivewire TTY's
+
+ config.h defines:
+
+ DW_VSER_NUM - number of virtual serial ports ( 0-14 )
+ DW_VWIN_NUM - number of virtual "9server" windows ( 0-14 )
+ DW_MIN_OFF - tty device minor offset
+
+ example:
+
+ #define DW_VSER_NUM 4
+ #define DW_VWIN_NUM 4
+ #define DW_MIN_OFF 3
+ #define NUM_DEV_TTY 10
+
+ then this module will map drivewire tty's to the following minors:
+
+ minor no description
+ 0-2 not mapped.
+ 3-6 Drivewire Virtual Serial Ports 0-3
+ 7-10 Drivewire Virtual Window Ports 0-3
+
+ Modify your platform's devtty.c to call the following external
+ functions: (don't forget to include ttydw.h)
+
+ Make sure to up your NUM_DEV_TTY define in your config.h to cover
+ all the added tty's !
+
+ External/Public Functions:
+
+ void dw_val( uint8_t minor );
+ void dw_putc( uint8_t minor, unsigned char c );
+ void dw_vopen( uint8_t minor );
+ void dw_vclose( uint8_t minor );
+ int dw_carrier( uint8_t minor );
+ void dw_vpoll( );
+
+ How you switch to these driver function/methods from your devtty.c
+ is up to you...
+
+ dw_vpoll should be called from the timer interrupt. To conserve
+ cpu time, this fuction only actually polls the DW server every .25
+ seconds
+
+ Finally, you will have to provide a platform dependent
+ "dw_transaction" routine/function:
+
+ int16_t dw_transaction( char *send, uint16_t scnt,
+ char *recv, uint16_t rcnt )
+
+ where "send" is a data buffer to send
+ "scnt" is the size of the send buffer
+ "recv" is a data buffer for the received reply
+ "rcnt" is the size of the recv buffer
+ returns: 0 on no error
+ -1 on DW reception framing error (too slow!!)
+ -2 on not all bytes received
+
+
+ Usage Notes:
+
+ You cannot stick a "sh" or "getty" on Virtual Serial ports
+ directly, as these Drivewire ports speak a higher level, but
+ simple, API for do TCP, DW control, MIDI etc. However, the Window
+ ports, are just that... you can "sh", "getty", or whatever them
+ directly. (stick 'em in your inittab)
+
+ Unfortunately, the current Drivewire server does not issue a close
+ port upon the closing of the actual window! It will, however, open
+ them on you server's machine upon Fuzix's opening of the port.
+
+ A stock DriveWire4 installation sets up the Virtual Serial Ports like this:
+
+ ports 1-13 : generic ports
+ ports 14 : direct connection to DriveWire's General MIDI
+*/
+
+#include <kernel.h>
+#include <printf.h>
+#include <tty.h>
+#include <devdw.h>
+
+#define DW_FASTWRITE 0x80
+#define DW_SETSTAT 0xC4
+#define DW_SERREAD 0x43
+#define DW_SERREADM 0x63
+#define DW_INIT 0x5a
+
+#define DW_VOPEN 0x29
+#define DW_VCLOSE 0x2A
+
+#define DW_NS_OFF ( DW_MIN_OFF + DW_VSER_NUM )
+
+
+/* Internal Structure to represent state of DW ports */
+struct dw_in{
+ uint8_t flags; /* flags for port */
+ /* outgoing buffer here! */
+};
+
+/* port flags */
+#define DW_FLG_OPEN 1 /* is port open? */
+
+
+/* and a table of the above structures */
+struct dw_in dwtab[ DW_VSER_NUM + DW_VWIN_NUM ];
+
+/* How many vsync ticks to wait until polling again, if
+ DW reports no data is waiting. */
+#define MAX_WAIT TICKSPERSEC / 4
+
+int wait=MAX_WAIT;
+
+/* Number of ports open. IF zero then polling routine
+ will not poll */
+int open_ports=0;
+
+
+/* buffer for receiving multiple bytes from vport channels */
+unsigned char tbuf[256];
+
+
+int mini( int a, int b ){
+ if( a < b ) return a;
+ return b;
+}
+
+
+/* Gets dw_tab entry for given minor */
+struct dw_in *dw_gettab( uint8_t minor ){
+ return &dwtab[ minor - DW_MIN_OFF ] ;
+}
+
+/* Translates a DW port no. to a proper minor no */
+int dw_minor( uint8_t port ){
+ if( port >= 16 ) return port - 16 + DW_NS_OFF ;
+ int ret = port + DW_MIN_OFF - 1 ;
+ return ret;
+
+}
+
+
+/* Translates a Minor to a port no */
+int dw_port( uint8_t minor ){
+ int ret = minor - DW_MIN_OFF + 1;
+ if( minor >= DW_NS_OFF )
+ return minor + 16 - DW_NS_OFF ;
+ return ret;
+}
+
+
+
+/* Put a character to the DriveWire port */
+void dw_putc( uint8_t minor, unsigned char c ){
+ unsigned char buf[2];
+ buf[0]=DW_FASTWRITE | dw_port( minor ) ;
+ buf[1]=c;
+ dw_transaction( buf, 2, NULL, 0 );
+}
+
+
+
+/* Open a DriveWire port */
+void dw_vopen( uint8_t minor ){
+ struct dw_in *p=dw_gettab( minor );
+ unsigned char buf[3];
+ buf[0]=DW_SETSTAT;
+ buf[1]=dw_port( minor );
+ buf[2]=DW_VOPEN;
+ if( ! ( p->flags & DW_FLG_OPEN ) ){
+ dw_transaction( buf, 3, NULL, 0 );
+ open_ports++;
+ }
+ p->flags |= DW_FLG_OPEN;
+}
+
+/* Close a DriveWire port */
+void dw_vclose( uint8_t minor){
+ struct dw_in *p=dw_gettab( minor );
+ unsigned char buf[3];
+ buf[0]=DW_SETSTAT;
+ buf[1]=dw_port( minor );
+ buf[2]=DW_VCLOSE;
+ if( p->flags & DW_FLG_OPEN ){
+ dw_transaction( buf, 3, NULL, 0 );
+ }
+}
+
+
+
+/* Return number of byte in tty's input queue */
+int qfree( uint8_t minor ){
+ queue_t *q = &ttyinq[minor];
+ return q->q_size - q->q_count;
+}
+
+
+
+/* Poll and add chars (if any) to input q
+ */
+void dw_vpoll( ){
+ unsigned char buf[2];
+ int i;
+ /* don't waste time polling of no ports are open*/
+ if( ! open_ports ) return ;
+ /* check ticks - don't poll until our delay is done */
+ if( --wait ) return;
+ /* up to four transactions at a poll */
+ for( i=0; i<4; i++){
+ buf[0]=DW_SERREAD;
+ dw_transaction( buf, 1, buf, 2 );
+ /* nothing waiting ? */
+ if( ! (buf[0] & 0x7f) ) {
+ wait=MAX_WAIT;
+ break;
+ }
+ /* VSER Channel single datum */
+ if( buf[0]<16 ){
+ int minor=dw_minor( buf[0] );
+ tty_inproc( minor, buf[1] );
+ continue;
+ }
+ /* VSER Channel closed? */
+ if( buf[0] == 16 ){
+ int minor=dw_minor( buf[1] );
+ struct dw_in *p=dw_gettab( minor );
+ if( p->flags & DW_FLG_OPEN ){
+ p->flags &= ~DW_FLG_OPEN;
+ open_ports--;
+ if( ttydata[minor].users )
+ tty_carrier_drop( minor);
+ }
+ continue;
+ }
+ /* VSER channel multiple data */
+ if( buf[0] < 32 ){
+ int i;
+ unsigned char b[3];
+ int min;
+ int minor=dw_minor( buf[0]-17 );
+ b[0]=DW_SERREADM;
+ b[1]=buf[0]-17;
+ min=mini( buf[1], qfree( minor ) );
+ b[2]=min;
+ if( !min ){
+ wait=1;
+ break;
+ }
+ dw_transaction( b,3,tbuf, min );
+ for( i=0; i<min; i++){
+ tty_inproc( minor, tbuf[i] );
+ }
+ wait=1;
+ break;
+ }
+ /* VWIN channel single datum */
+ if( buf[0] < 144 ){
+ int minor=dw_minor( buf[0]-48 );
+ tty_inproc( minor, buf[1] );
+ continue;
+ }
+ /* something we don't handle? */
+ kprintf("out of band data\n");
+ }
+}
+
+
+
+/* Tests DriveWire port for being open */
+/* returns: 1 on open, 0 on closed */
+int dw_carrier( uint8_t minor ){
+ struct dw_in *p=dw_gettab( minor );
+ return p->flags & DW_FLG_OPEN ;
+}
+
+
+/* (re) Initializes DW */
+void dw_init( ){
+ unsigned char buf[2];
+ buf[0]=DW_INIT;
+ buf[1]=0x42;
+ dw_transaction( buf,2,buf,1 );
+}
public / FUZIX.git / commitdiff