I (rgrimes) cleaned the code up some, mostly just format stuff.
>From: csgr@alpha.ru.ac.za (Geoff Rehmet) Date: Wed, 16 Feb 1994 21:28:06 +0200 (GMT+0200) New version of lpt, most of the brokenness fixed.
This commit is contained in:
Rodney W. Grimes
parent
dbd8393f77
commit
4568df5233
@ -76,16 +76,21 @@
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#define LPPRI (PZERO+8)
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#define BUFSIZE 1024
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/* BIOS printer list - used by BIOS probe*/
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#define BIOS_LPT_PORTS 0x408
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#define BIOS_PORTS (short *)(KERNBASE+BIOS_LPT_PORTS)
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#define BIOS_MAX_LPT 4
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#ifndef DEBUG
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#define lprintf (void)
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#else
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#define lprintf if (lptflag) printf
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int lptflag = 1;
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#endif
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void lptout();
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#ifdef DEBUG
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int lptflag = 1;
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#endif
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int lptprobe(), lptattach();
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void lptintr();
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@ -103,7 +108,7 @@ struct lpt_softc {
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/* default case: negative prime, negative ack, handshake strobe,
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prime once */
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u_char sc_control;
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u_char sc_flags;
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char sc_flags;
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#define LP_POS_INIT 0x04 /* if we are a postive init signal */
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#define LP_POS_ACK 0x08 /* if we are a positive going ack */
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#define LP_NO_PRIME 0x10 /* don't prime the printer at all */
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@ -114,6 +119,9 @@ struct lpt_softc {
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short sc_xfercnt ;
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char sc_primed;
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char *sc_cp ;
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u_char sc_irq ; /* IRQ status of port */
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#define LP_HAS_IRQ 0x01 /* we have an irq available */
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#define LP_USE_IRQ 0x02 /* we are using our irq */
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} lpt_sc[NLPT] ;
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/* bits for state */
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@ -121,9 +129,27 @@ struct lpt_softc {
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#define ASLP (1<<1) /* awaiting draining of printer */
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#define ERROR (1<<2) /* error was received from printer */
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#define OBUSY (1<<3) /* printer is busy doing output */
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#define LPTOUT (1<<4) /* timeout while not selected */
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#define TOUT (1<<5) /* timeout while not selected */
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#define LPTOUT (1<<4) /* timeout while not selected */
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#define TOUT (1<<5) /* timeout while not selected */
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#define INIT (1<<6) /* waiting to initialize for open */
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#define INTERRUPTED (1<<7) /* write call was interrupted */
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/* status masks to interrogate printer status */
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#define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */
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#define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR)
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/* Printer Ready condition - from lpa.c */
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/* Only used in polling code */
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#define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR)
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#define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR)
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#define NOT_READY(x) ((inb(x)^LPS_INVERT)&LPS_MASK)
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#define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
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#define MAX_SPIN 20 /* Max delay for device ready in usecs */
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/*
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* Internal routine to lptprobe to do port tests of one byte value
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@ -138,18 +164,31 @@ lpt_port_test(port, data, mask)
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data = data & mask;
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outb(port, data);
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timeout = 100;
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do
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timeout = 10000;
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do {
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DELAY(10);
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temp = inb(port) & mask;
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}
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while (temp != data && --timeout);
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lprintf("Port 0x%x\tout=%x\tin=%x\n", port, data, temp);
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lprintf("Port 0x%x\tout=%x\tin=%x\ttout=%d\n",
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port, data, temp, timeout);
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return (temp == data);
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}
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/*
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* New lptprobe routine written by Rodney W. Grimes, 3/25/1993
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* New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
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* Based partially on Rod Grimes' printer probe
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*
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* Logic:
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* 1) If no port address was given, use the bios detected ports
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* and autodetect what ports the printers are on.
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* 2) Otherwise, probe the data port at the address given,
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* using the method in Rod Grimes' port probe.
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* (Much code ripped off directly from Rod's probe.)
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*
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* Comments from Rod's probe:
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* Logic:
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* 1) You should be able to write to and read back the same value
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* to the data port. Do an alternating zeros, alternating ones,
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* walking zero, and walking one test to check for stuck bits.
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@ -167,56 +206,83 @@ lpt_port_test(port, data, mask)
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* don't know at this point, if that becomes a problem these bits
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* should be turned off in the mask byte for the control port test.
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*
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* We are finally left with a mask of 0x14, due to some printers
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* being adamant about holding other bits high ........
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*
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* Before probing the control port, we write a 0 to the data port -
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* If not, some printers chuck out garbage when the strobe line
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* gets toggled.
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*
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* 3) Set the data and control ports to a value of 0
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*
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* This probe routine has been tested on Epson Lx-800, HP LJ3P,
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* Epson FX-1170 and C.Itoh 8510RM
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* printers.
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* Quick exit on fail added.
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*/
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int
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lptprobe(dvp)
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struct isa_device *dvp;
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{
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int status;
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short port;
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u_char data;
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u_char mask;
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int i;
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short port;
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static short next_bios_lpt = 0;
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int status;
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u_char data;
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u_char mask;
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int i;
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/*
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* Make sure there is some way for lptopen to see that
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* the port is not configured
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* This 0 will remain if the port isn't attached
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*/
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(lpt_sc + dvp->id_unit)->sc_port = 0;
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status = IO_LPTSIZE;
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/* If port not specified, use bios list */
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if(dvp->id_iobase < 0) { /* port? */
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if((next_bios_lpt < BIOS_MAX_LPT) &&
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(*(BIOS_PORTS+next_bios_lpt) != 0) ) {
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dvp->id_iobase = *(BIOS_PORTS+next_bios_lpt++);
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goto end_probe;
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} else
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return (0);
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}
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/* Port was explicitly specified */
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/* This allows probing of ports unknown to the BIOS */
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port = dvp->id_iobase + lpt_data;
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mask = 0xff;
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while (mask != 0)
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{
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data = 0x55; /* Alternating zeros */
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if (!lpt_port_test(port, data, mask)) status = 0;
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data = 0x55; /* Alternating zeros */
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if (!lpt_port_test(port, data, mask))
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{ status = 0 ; goto end_probe ; }
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data = 0xaa; /* Alternating ones */
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if (!lpt_port_test(port, data, mask)) status = 0;
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data = 0xaa; /* Alternating ones */
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if (!lpt_port_test(port, data, mask))
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{ status = 0 ; goto end_probe ; }
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for (i = 0; i < 8; i++) /* Walking zero */
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{
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data = ~(1 << i);
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if (!lpt_port_test(port, data, mask)) status = 0;
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}
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for (i = 0; i < 8; i++) { /* Walking zero */
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data = ~(1 << i);
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if (!lpt_port_test(port, data, mask))
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{ status = 0 ; goto end_probe ; }
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}
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for (i = 0; i < 8; i++) /* Walking one */
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{
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data = (1 << i);
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if (!lpt_port_test(port, data, mask)) status = 0;
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}
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for (i = 0; i < 8; i++) { /* Walking one */
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data = (1 << i);
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if (!lpt_port_test(port, data, mask))
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{ status = 0 ; goto end_probe ; }
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}
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if (port == dvp->id_iobase + lpt_data)
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{
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port = dvp->id_iobase + lpt_control;
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mask = 0x1e;
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}
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else
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mask = 0;
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}
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end_probe:
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/* write 0's to control and data ports */
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outb(dvp->id_iobase+lpt_data, 0);
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outb(dvp->id_iobase+lpt_control, 0);
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return (status);
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}
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/* XXX Todo - try and detect if interrupt is working */
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int
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lptattach(isdp)
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struct isa_device *isdp;
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@ -225,7 +291,20 @@ lptattach(isdp)
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sc = lpt_sc + isdp->id_unit;
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sc->sc_port = isdp->id_iobase;
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sc->sc_primed = 0; /* not primed yet */
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outb(sc->sc_port+lpt_control, LPC_NINIT);
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/* check if we can use interrupt */
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lprintf("oldirq %x\n", sc->sc_irq);
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if(isdp->id_irq) {
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sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ;
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printf("lpt%d: Interrupt-driven port\n", isdp->id_unit);
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} else {
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sc->sc_irq = 0;
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lprintf("lpt%d: Polled port\n", isdp->id_unit);
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}
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lprintf("irq %x\n", sc->sc_irq);
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return (1);
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}
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@ -242,19 +321,21 @@ lptopen(dev, flag)
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int s;
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int trys, port;
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u_int unit = LPTUNIT(minor(dev));
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if (unit >= NLPT)
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return (ENXIO);
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sc = lpt_sc + unit;
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if ((unit >= NLPT) || (sc->sc_port == 0))
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return (ENXIO);
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/* Only check open bit */
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if (sc->sc_state) {
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lprintf("lp: still open\n") ;
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lprintf("still open %x\n", sc->sc_state);
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lprintf("lp: still open\n") ;
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lprintf("still open %x\n", sc->sc_state);
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return(EBUSY);
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} else sc->sc_state |= INIT;
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s = spltty();
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sc->sc_flags = LPTFLAGS(minor(dev));
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lprintf("lp flags 0x%x\n", sc->sc_flags);
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lprintf("lp flags 0x%x\n", sc->sc_flags);
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port = sc->sc_port;
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/* init printer */
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@ -274,13 +355,13 @@ lprintf("lp flags 0x%x\n", sc->sc_flags);
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if (trys++ >= LPINITRDY*4) {
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splx(s);
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sc->sc_state = 0;
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lprintf ("status %x\n", inb(port+lpt_status) );
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lprintf ("status %x\n", inb(port+lpt_status) );
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return (EBUSY);
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}
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/* wait 1/4 second, give up if we get a signal */
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if (tsleep ((caddr_t)sc, LPPRI|PCATCH, "lptinit", hz/4)
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!= EWOULDBLOCK) {
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if (tsleep ((caddr_t)sc, LPPRI|PCATCH, "lptinit",
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hz/4) != EWOULDBLOCK) {
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sc->sc_state = 0;
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splx(s);
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return (EBUSY);
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@ -290,20 +371,27 @@ lprintf ("status %x\n", inb(port+lpt_status) );
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} while ((inb(port+lpt_status) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
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(LPS_SEL|LPS_NBSY|LPS_NERR));
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if(sc->sc_flags&LP_AUTOLF) {
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outb(port+lpt_control, LPC_SEL|LPC_NINIT|LPC_ENA|LPC_AUTOL);
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sc->sc_control = LPC_SEL|LPC_NINIT|LPC_ENA|LPC_AUTOL;
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} else {
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outb(port+lpt_control, LPC_SEL|LPC_NINIT|LPC_ENA);
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sc->sc_control = LPC_SEL|LPC_NINIT|LPC_ENA;
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}
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sc->sc_control = LPC_SEL|LPC_NINIT;
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if(sc->sc_flags&LP_AUTOLF)
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sc->sc_control |= LPC_AUTOL;
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/* enable interrupt if interrupt-driven */
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if(sc->sc_irq & LP_USE_IRQ)
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sc->sc_control |= LPC_ENA;
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sc->sc_state = OPEN | TOUT;
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outb(port+lpt_control, sc->sc_control);
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sc->sc_state = OPEN;
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sc->sc_inbuf = geteblk(BUFSIZE);
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sc->sc_xfercnt = 0;
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splx(s);
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timeout (lptout, (caddr_t)sc, hz/2);
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lprintf("opened.\n");
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/* only use timeout if using interrupt */
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lprintf("irq %x\n", sc->sc_irq);
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if(sc->sc_irq & LP_USE_IRQ) {
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sc->sc_state |= TOUT;
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timeout (lptout, (caddr_t)sc, hz/2);
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}
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lprintf("opened.\n");
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return(0);
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}
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@ -312,7 +400,7 @@ lptout (sc)
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struct lpt_softc *sc;
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{ int pl;
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lprintf ("T %x ", inb(sc->sc_port+lpt_status));
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lprintf ("T %x ", inb(sc->sc_port+lpt_status));
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if (sc->sc_state&OPEN)
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timeout (lptout, (caddr_t)sc, hz/2);
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else sc->sc_state &= ~TOUT;
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@ -335,6 +423,8 @@ lprintf ("T %x ", inb(sc->sc_port+lpt_status));
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/*
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* lptclose -- close the device, free the local line buffer.
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*
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* Check for interrupted write call added.
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*/
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int
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@ -346,24 +436,90 @@ lptclose(dev, flag)
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int port = sc->sc_port;
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sc->sc_state &= ~OPEN;
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while ((inb(port+lpt_status) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
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/* if the last write was interrupted, don't complete it */
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if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ))
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while ((inb(port+lpt_status) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
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(LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt)
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/* wait 1/4 second, give up if we get a signal */
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if (tsleep ((caddr_t)sc, LPPRI|PCATCH, "lpclose", hz)
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!= EWOULDBLOCK)
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break;
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/* wait 1/4 second, give up if we get a signal */
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if (tsleep ((caddr_t)sc, LPPRI|PCATCH,
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"lpclose", hz) != EWOULDBLOCK)
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break;
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sc->sc_state = 0;
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sc->sc_xfercnt = 0;
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outb(sc->sc_port+lpt_control, LPC_NINIT);
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brelse(sc->sc_inbuf);
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lprintf("closed.\n");
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lprintf("closed.\n");
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return(0);
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}
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/*
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* pushbytes()
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* Workhorse for actually spinning and writing bytes to printer
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* Derived from lpa.c
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* Originally by ?
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*
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* This code is only used when we are polling the port
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*/
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static int
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pushbytes(sc)
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struct lpt_softc *sc;
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{
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int spin, err, tic;
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char ch;
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int port = sc->sc_port;
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/* loop for every character .. */
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while (sc->sc_xfercnt > 0) {
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/* printer data */
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ch = *(sc->sc_cp);
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sc->sc_cp++;
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sc->sc_xfercnt--;
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/*
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* Wait for printer ready.
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* Loop 20 usecs testing BUSY bit, then sleep
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* for exponentially increasing timeout. (vak)
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*/
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for (spin=0; NOT_READY(port+lpt_status) && spin<MAX_SPIN; ++spin)
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DELAY(1); /* XXX delay is NOT this accurate! */
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if (spin >= MAX_SPIN) {
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tic = 0;
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while (NOT_READY(port+lpt_status)) {
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/*
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* Now sleep, every cycle a
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* little longer ..
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*/
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tic = tic + tic + 1;
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/*
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* But no more than 10 seconds. (vak)
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*/
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if (tic > MAX_SLEEP)
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tic = MAX_SLEEP;
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err = tsleep((caddr_t)sc, LPPRI,
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"lptpoll", tic);
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if (err != EWOULDBLOCK) {
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return (err);
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}
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}
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}
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/* output data */
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outb(port+lpt_data, ch);
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/* strobe */
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outb(port+lpt_control, sc->sc_control|LPC_STB);
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outb(port+lpt_control, sc->sc_control);
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}
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return(0);
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}
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/*
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* lptwrite --copy a line from user space to a local buffer, then call
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* putc to get the chars moved to the output queue.
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*
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* Flagging of interrupted write added.
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*/
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int
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@ -375,24 +531,34 @@ lptwrite(dev, uio)
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int pl, err;
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struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
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sc->sc_state &= ~INTERRUPTED;
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while (n = MIN(BUFSIZE, uio->uio_resid)) {
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sc->sc_cp = sc->sc_inbuf->b_un.b_addr ;
|
||||
uiomove(sc->sc_cp, n, uio);
|
||||
sc->sc_xfercnt = n ;
|
||||
while (sc->sc_xfercnt > 0) {
|
||||
/* if the printer is ready for a char, give it one */
|
||||
if ((sc->sc_state & OBUSY) == 0){
|
||||
lprintf("\nC %d. ", sc->sc_xfercnt);
|
||||
pl = spltty();
|
||||
lptintr(sc - lpt_sc);
|
||||
(void) splx(pl);
|
||||
}
|
||||
if (sc->sc_state & OBUSY) {
|
||||
lprintf("W ");
|
||||
if (err = tsleep ((caddr_t)sc, LPPRI|PCATCH,
|
||||
"lpwrite", 0))
|
||||
return(err);
|
||||
if(sc->sc_irq & LP_USE_IRQ)
|
||||
while (sc->sc_xfercnt > 0) {
|
||||
lprintf("i");
|
||||
/* if the printer is ready for a char, */
|
||||
/* give it one */
|
||||
if ((sc->sc_state & OBUSY) == 0){
|
||||
lprintf("\nC %d. ", sc->sc_xfercnt);
|
||||
pl = spltty();
|
||||
lptintr(sc - lpt_sc);
|
||||
(void) splx(pl);
|
||||
}
|
||||
lprintf("W ");
|
||||
if (sc->sc_state & OBUSY)
|
||||
if (err = tsleep ((caddr_t)sc,
|
||||
LPPRI|PCATCH, "lpwrite", 0)) {
|
||||
sc->sc_state |= INTERRUPTED;
|
||||
return(err);
|
||||
}
|
||||
}
|
||||
else { /* polled write */
|
||||
lprintf("p");
|
||||
if((err = pushbytes(sc)))
|
||||
return(err);
|
||||
}
|
||||
}
|
||||
return(0);
|
||||
@ -401,6 +567,8 @@ lprintf("W ");
|
||||
/*
|
||||
* lptintr -- handle printer interrupts which occur when the printer is
|
||||
* ready to accept another char.
|
||||
*
|
||||
* do checking for interrupted write call.
|
||||
*/
|
||||
|
||||
void
|
||||
@ -408,37 +576,39 @@ lptintr(unit)
|
||||
int unit;
|
||||
{
|
||||
struct lpt_softc *sc = lpt_sc + unit;
|
||||
int port = sc->sc_port,sts,lpc;
|
||||
u_char ctrl = sc->sc_control & ~LPC_ENA;
|
||||
int port = sc->sc_port, sts;
|
||||
|
||||
sts = inb(port+lpt_status);
|
||||
/* is printer online and ready for output */
|
||||
if (((sts=inb(port+lpt_status)) & RDY_MASK) == LP_READY) {
|
||||
sc->sc_state = (sc->sc_state | OBUSY) & ~ERROR;
|
||||
|
||||
/* disable interupts */
|
||||
outb(port+lpt_control, ctrl);
|
||||
if (sc->sc_xfercnt) {
|
||||
/* send char */
|
||||
/*lprintf("%x ", *sc->sc_cp); */
|
||||
outb(port+lpt_data, *sc->sc_cp++) ;
|
||||
outb(port+lpt_control, sc->sc_control|LPC_STB);
|
||||
/* DELAY(X) */
|
||||
outb(port+lpt_control, sc->sc_control);
|
||||
|
||||
sc->sc_state |= OBUSY;
|
||||
while(sc->sc_xfercnt > 0) {
|
||||
lpc = 50;
|
||||
/* wait for printer ready for output */
|
||||
while(((inb(port+lpt_status)&(LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR))
|
||||
!=(LPS_SEL|LPS_NBSY|LPS_NERR)) && --lpc);
|
||||
if(lpc == 0) break;
|
||||
/* any more data for printer */
|
||||
if(--(sc->sc_xfercnt) > 0) return;
|
||||
}
|
||||
|
||||
/* send char */
|
||||
outb(port+lpt_data, *sc->sc_cp++) ; sc->sc_xfercnt-- ;
|
||||
outb(port+lpt_control, ctrl|LPC_STB);
|
||||
outb(port+lpt_control, ctrl);
|
||||
}
|
||||
|
||||
/* any more bytes for the printer? */
|
||||
if(sc->sc_xfercnt == 0) {
|
||||
/* none, wake up the top half to get more */
|
||||
/*
|
||||
* No more data waiting for printer.
|
||||
* Wakeup is not done if write call was interrupted.
|
||||
*/
|
||||
sc->sc_state &= ~OBUSY;
|
||||
wakeup((caddr_t)sc);
|
||||
if(!(sc->sc_state & INTERRUPTED))
|
||||
wakeup((caddr_t)sc);
|
||||
lprintf("w ");
|
||||
return;
|
||||
} else { /* check for error */
|
||||
if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
|
||||
(sc->sc_state & OPEN))
|
||||
sc->sc_state |= ERROR;
|
||||
}
|
||||
|
||||
/* reenable interupts */
|
||||
outb(port+lpt_control, sc->sc_control);
|
||||
lprintf("sts %x ", sts);
|
||||
}
|
||||
|
||||
int
|
||||
|
||||
Loading…
Reference in New Issue
Block a user