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ast.c revision 1.12 
      1  1.12  mycroft /*	$NetBSD: ast.c,v 1.12 1994/11/18 22:07:32 mycroft Exp $	*/
      2   1.9      cgd 
      3   1.1      cgd /*
      4   1.1      cgd  * Multi-port serial card interrupt demuxing support.
      5   1.1      cgd  * Roland McGrath 3/20/94
      6   1.4      cgd  * The author disclaims copyright and places this file in the public domain.
      7   1.1      cgd  *
      8   1.4      cgd  * Modified by: Charles Hannum, 3/22/94
      9   1.1      cgd  */
     10   1.1      cgd 
     11   1.5  mycroft #include <sys/param.h>
     12   1.2  mycroft #include <sys/device.h>
     13   1.1      cgd 
     14   1.1      cgd #include <machine/pio.h>
     15   1.5  mycroft 
     16   1.5  mycroft #include <i386/isa/isavar.h>
     17   1.1      cgd 
     18   1.2  mycroft struct ast_softc {
     19   1.2  mycroft 	struct device sc_dev;
     20   1.7  mycroft 	struct intrhand sc_ih;
     21   1.7  mycroft 
     22  1.11  mycroft 	int sc_iobase;
     23   1.5  mycroft 	int sc_alive;		/* mask of slave units attached */
     24   1.7  mycroft 	void *sc_slaves[4];	/* com device unit numbers */
     25   1.5  mycroft };
     26   1.5  mycroft 
     27   1.5  mycroft int astprobe();
     28   1.5  mycroft void astattach();
     29   1.7  mycroft int astintr __P((struct ast_softc *));
     30   1.5  mycroft 
     31   1.5  mycroft struct cfdriver astcd = {
     32  1.10  mycroft 	NULL, "ast", astprobe, astattach, DV_TTY, sizeof(struct ast_softc), 1
     33   1.5  mycroft };
     34   1.1      cgd 
     35   1.1      cgd int
     36   1.5  mycroft astprobe(parent, self, aux)
     37   1.5  mycroft 	struct device *parent, *self;
     38   1.5  mycroft 	void *aux;
     39   1.1      cgd {
     40   1.5  mycroft 	struct isa_attach_args *ia = aux;
     41   1.2  mycroft 
     42   1.1      cgd 	/*
     43   1.1      cgd 	 * Do the normal com probe for the first UART and assume
     44   1.1      cgd 	 * its presence means there is a multiport board there.
     45   1.5  mycroft 	 * XXX Needs more robustness.
     46   1.1      cgd 	 */
     47   1.6  mycroft 	ia->ia_iosize = 4 * 8;
     48  1.10  mycroft 	return (comprobe1(ia->ia_iobase));
     49   1.1      cgd }
     50   1.1      cgd 
     51   1.5  mycroft struct ast_attach_args {
     52   1.5  mycroft 	int aa_slave;
     53   1.5  mycroft };
     54   1.5  mycroft 
     55   1.1      cgd int
     56  1.10  mycroft astsubmatch(parent, match, aux)
     57  1.10  mycroft 	struct device *parent;
     58  1.10  mycroft 	void *match, *aux;
     59   1.1      cgd {
     60   1.5  mycroft 	struct ast_softc *sc = (void *)parent;
     61  1.10  mycroft 	struct device *self = match;
     62  1.10  mycroft 	struct isa_attach_args *ia = aux;
     63  1.10  mycroft 	struct ast_attach_args *aa = ia->ia_aux;
     64   1.5  mycroft 	struct cfdata *cf = self->dv_cfdata;
     65   1.2  mycroft 
     66  1.10  mycroft 	if (cf->cf_loc[0] != -1 && cf->cf_loc[0] != aa->aa_slave)
     67  1.10  mycroft 		return (0);
     68  1.10  mycroft 	return ((*cf->cf_driver->cd_match)(parent, match, ia));
     69  1.10  mycroft }
     70  1.10  mycroft 
     71  1.10  mycroft int
     72  1.10  mycroft astprint(aux, ast)
     73  1.10  mycroft 	void *aux;
     74  1.10  mycroft 	char *ast;
     75  1.10  mycroft {
     76  1.10  mycroft 	struct isa_attach_args *ia = aux;
     77  1.10  mycroft 	struct ast_attach_args *aa = ia->ia_aux;
     78  1.10  mycroft 
     79  1.10  mycroft 	printf(" slave %d", aa->aa_slave);
     80   1.1      cgd }
     81   1.1      cgd 
     82   1.1      cgd void
     83   1.5  mycroft astattach(parent, self, aux)
     84   1.5  mycroft 	struct device *parent, *self;
     85   1.5  mycroft 	void *aux;
     86   1.1      cgd {
     87   1.5  mycroft 	struct ast_softc *sc = (void *)self;
     88   1.5  mycroft 	struct isa_attach_args *ia = aux;
     89   1.5  mycroft 	struct ast_attach_args aa;
     90  1.10  mycroft 	struct isa_attach_args isa;
     91  1.10  mycroft 
     92  1.10  mycroft 	sc->sc_iobase = ia->ia_iobase;
     93   1.1      cgd 
     94   1.5  mycroft 	/*
     95   1.5  mycroft 	 * Enable the master interrupt.
     96   1.5  mycroft 	 */
     97   1.5  mycroft 	outb(sc->sc_iobase | 0x1f, 0x80);
     98  1.10  mycroft 
     99   1.5  mycroft 	printf("\n");
    100   1.5  mycroft 
    101  1.10  mycroft 	isa.ia_aux = &aa;
    102  1.10  mycroft 	for (aa.aa_slave = 0; aa.aa_slave < 4; aa.aa_slave++) {
    103  1.10  mycroft 		void *match;
    104  1.10  mycroft 		isa.ia_iobase = sc->sc_iobase + 8 * aa.aa_slave;
    105  1.10  mycroft 		isa.ia_iosize = 0x666;
    106  1.10  mycroft 		isa.ia_irq = IRQUNK;
    107  1.10  mycroft 		isa.ia_drq = DRQUNK;
    108  1.10  mycroft 		isa.ia_msize = 0;
    109  1.10  mycroft 		if ((match = config_search(astsubmatch, self, &isa)) != 0) {
    110  1.10  mycroft 			sc->sc_slaves[aa.aa_slave] = match;
    111  1.10  mycroft 			sc->sc_alive |= 1 << aa.aa_slave;
    112  1.10  mycroft 			config_attach(self, match, &isa, astprint);
    113  1.10  mycroft 		}
    114  1.10  mycroft 	}
    115   1.7  mycroft 
    116   1.7  mycroft 	sc->sc_ih.ih_fun = astintr;
    117   1.7  mycroft 	sc->sc_ih.ih_arg = sc;
    118   1.7  mycroft 	sc->sc_ih.ih_level = IPL_TTY;
    119   1.7  mycroft 	intr_establish(ia->ia_irq, &sc->sc_ih);
    120   1.1      cgd }
    121   1.1      cgd 
    122   1.1      cgd int
    123   1.7  mycroft astintr(sc)
    124   1.7  mycroft 	struct ast_softc *sc;
    125   1.1      cgd {
    126  1.12  mycroft 	int iobase = sc->sc_iobase;
    127   1.2  mycroft 	int alive = sc->sc_alive;
    128   1.1      cgd 	int bits;
    129   1.1      cgd 
    130  1.10  mycroft 	bits = ~inb(iobase | 0x1f) & alive;
    131   1.8  mycroft 	if (bits == 0)
    132  1.10  mycroft 		return (0);
    133   1.2  mycroft 
    134   1.8  mycroft 	for (;;) {
    135   1.2  mycroft #define	TRY(n) \
    136   1.8  mycroft 		if (bits & (1 << (n))) \
    137   1.5  mycroft 			comintr(sc->sc_slaves[n]);
    138   1.2  mycroft 		TRY(0);
    139   1.2  mycroft 		TRY(1);
    140   1.2  mycroft 		TRY(2);
    141   1.2  mycroft 		TRY(3);
    142   1.5  mycroft #undef TRY
    143  1.10  mycroft 		bits = ~inb(iobase | 0x1f) & alive;
    144   1.8  mycroft 		if (bits == 0)
    145  1.10  mycroft 			return (1);
    146   1.8  mycroft  	}
    147   1.1      cgd }
    148