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ast.c revision 1.4 
      1  1.1      cgd /*
      2  1.1      cgd  * Multi-port serial card interrupt demuxing support.
      3  1.1      cgd  * Roland McGrath 3/20/94
      4  1.4      cgd  * The author disclaims copyright and places this file in the public domain.
      5  1.1      cgd  *
      6  1.4      cgd  * Modified by: Charles Hannum, 3/22/94
      7  1.4      cgd  *
      8  1.4      cgd  *	$Id: ast.c,v 1.4 1994/03/23 03:55:24 cgd Exp $
      9  1.1      cgd  */
     10  1.1      cgd 
     11  1.1      cgd #include "ast.h"
     12  1.1      cgd 
     13  1.1      cgd #include <sys/types.h>
     14  1.2  mycroft #include <sys/device.h>
     15  1.1      cgd 
     16  1.1      cgd #include <machine/pio.h>
     17  1.1      cgd #include <i386/isa/isa_device.h>
     18  1.1      cgd 
     19  1.1      cgd int astprobe __P((struct isa_device *));
     20  1.1      cgd int astattach __P((struct isa_device *));
     21  1.1      cgd 
     22  1.1      cgd struct	isa_driver astdriver = {
     23  1.1      cgd 	astprobe, astattach, "ast"
     24  1.1      cgd };
     25  1.1      cgd 
     26  1.2  mycroft struct ast_softc {
     27  1.2  mycroft 	struct device sc_dev;
     28  1.2  mycroft 	u_short sc_iobase;
     29  1.2  mycroft 	int sc_alive;		/* Mask of slave units attached. */
     30  1.2  mycroft 	int sc_slaves[8];	/* com device unit numbers. XXX - softc ptrs */
     31  1.2  mycroft } ast_softc[NAST];
     32  1.1      cgd 
     33  1.1      cgd int
     34  1.2  mycroft astprobe(dev)
     35  1.2  mycroft 	struct isa_device *dev;
     36  1.1      cgd {
     37  1.2  mycroft 
     38  1.1      cgd 	/*
     39  1.1      cgd 	 * Do the normal com probe for the first UART and assume
     40  1.1      cgd 	 * its presence means there is a multiport board there.
     41  1.1      cgd 	 * XXX needs more robustness.
     42  1.1      cgd 	 */
     43  1.2  mycroft 	return comprobe1(dev->id_iobase);
     44  1.1      cgd }
     45  1.1      cgd 
     46  1.1      cgd int
     47  1.2  mycroft astattach(dev)
     48  1.2  mycroft 	struct isa_device *dev;
     49  1.1      cgd {
     50  1.2  mycroft 	struct ast_softc *sc = &ast_softc[dev->id_unit];
     51  1.2  mycroft   	u_short iobase = dev->id_iobase;
     52  1.1      cgd 	unsigned int x;
     53  1.2  mycroft 
     54  1.2  mycroft 	/* XXX HACK */
     55  1.2  mycroft 	sprintf(sc->sc_dev.dv_xname, "%s%d", astdriver.name, dev->id_unit);
     56  1.2  mycroft 	sc->sc_dev.dv_unit = dev->id_unit;
     57  1.2  mycroft 
     58  1.2  mycroft 	sc->sc_iobase = iobase;
     59  1.1      cgd 
     60  1.1      cgd 	/*
     61  1.2  mycroft 	 * Enable the master interrupt.
     62  1.1      cgd 	 */
     63  1.2  mycroft 	outb(iobase | 0x1f, 0x80);
     64  1.2  mycroft 	x = inb(iobase | 0x1f);
     65  1.1      cgd 	/*
     66  1.1      cgd 	 * My guess is this bitmask tells you how many ports are there.
     67  1.1      cgd 	 * I only have a 4-port board to try (returns 0xf). --roland
     68  1.2  mycroft 	 *
     69  1.2  mycroft 	 * It's also not clear that it would be correct to rely on this, since
     70  1.2  mycroft 	 * there might be an interrupt pending on one of the ports, and thus
     71  1.3  mycroft 	 * its bit wouldn't be set.  I think the AST protocol simply does not
     72  1.3  mycroft 	 * support more than 4 ports.  - mycroft
     73  1.1      cgd 	 */
     74  1.2  mycroft 	printf("%s: 0x%x\n", sc->sc_dev.dv_xname, x);
     75  1.1      cgd }
     76  1.1      cgd 
     77  1.1      cgd void
     78  1.2  mycroft astslave(dev)
     79  1.2  mycroft 	struct isa_device *dev;
     80  1.1      cgd {
     81  1.2  mycroft 	struct ast_softc *sc = &ast_softc[dev->id_parent->id_unit];
     82  1.1      cgd 
     83  1.2  mycroft 	sc->sc_slaves[dev->id_physid] = dev->id_unit;
     84  1.2  mycroft 	sc->sc_alive |= 1 << dev->id_physid;
     85  1.1      cgd }
     86  1.1      cgd 
     87  1.1      cgd int
     88  1.2  mycroft astintr(unit)
     89  1.2  mycroft 	int unit;
     90  1.1      cgd {
     91  1.2  mycroft 	struct ast_softc *sc = &ast_softc[unit];
     92  1.2  mycroft 	u_short iobase = sc->sc_iobase;
     93  1.2  mycroft 	int alive = sc->sc_alive;
     94  1.1      cgd 	int bits;
     95  1.1      cgd 
     96  1.2  mycroft 	bits = inb(iobase | 0x1f) & alive;
     97  1.2  mycroft 	if (bits == alive)
     98  1.2  mycroft 		return 0;
     99  1.2  mycroft 
    100  1.1      cgd 	do {
    101  1.2  mycroft #define	TRY(n) \
    102  1.2  mycroft 		if ((bits & (1 << (n))) == 0) \
    103  1.2  mycroft 			comintr(sc->sc_slaves[n]);	/* XXX softc ptr */
    104  1.2  mycroft 		TRY(0);
    105  1.2  mycroft 		TRY(1);
    106  1.2  mycroft 		TRY(2);
    107  1.2  mycroft 		TRY(3);
    108  1.3  mycroft #ifdef notdef
    109  1.2  mycroft 		TRY(4);
    110  1.2  mycroft 		TRY(5);
    111  1.2  mycroft 		TRY(6);
    112  1.2  mycroft 		TRY(7);
    113  1.3  mycroft #endif
    114  1.2  mycroft 		bits = inb(iobase | 0x1f) & alive;
    115  1.1      cgd  	} while (bits != alive);
    116  1.1      cgd 
    117  1.1      cgd 	return 1;
    118  1.1      cgd }
    119