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j720ssp.c revision 1.24.2.1 
      1 /*	$NetBSD: j720ssp.c,v 1.24.2.1 2006/06/21 14:51:44 yamt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001, 2006 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by IWAMOTO Toshihiro.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /* Jornada 720 SSP port. */
     40 
     41 #include <sys/cdefs.h>
     42 __KERNEL_RCSID(0, "$NetBSD: j720ssp.c,v 1.24.2.1 2006/06/21 14:51:44 yamt Exp $");
     43 
     44 #include <sys/param.h>
     45 #include <sys/systm.h>
     46 #include <sys/device.h>
     47 
     48 #include <arm/sa11x0/sa11x0_var.h>
     49 #include <arm/sa11x0/sa11x0_gpioreg.h>
     50 #include <arm/sa11x0/sa11x0_ppcreg.h>
     51 #include <arm/sa11x0/sa11x0_sspreg.h>
     52 
     53 #include <hpcarm/dev/j720sspvar.h>
     54 
     55 #ifdef DEBUG
     56 #define DPRINTF(arg)	printf arg
     57 #else
     58 #define DPRINTF(arg)	/* nothing */
     59 #endif
     60 
     61 static int	j720ssp_match(struct device *, struct cfdata *, void *);
     62 static void	j720ssp_attach(struct device *, struct device *, void *);
     63 static int	j720ssp_search(struct device *, struct cfdata *,
     64 		    const int *, void *);
     65 static int	j720ssp_print(void *, const char *);
     66 
     67 CFATTACH_DECL(j720ssp, sizeof(struct j720ssp_softc),
     68     j720ssp_match, j720ssp_attach, NULL, NULL);
     69 
     70 
     71 static int
     72 j720ssp_match(struct device *parent, struct cfdata *cf, void *aux)
     73 {
     74 
     75 	if (strcmp(cf->cf_name, "j720ssp") != 0)
     76 		return 0;
     77 
     78 	return 1;
     79 }
     80 
     81 static void
     82 j720ssp_attach(struct device *parent, struct device *self, void *aux)
     83 {
     84 	struct j720ssp_softc *sc = (void *)self;
     85 	struct sa11x0_softc *psc = (void *)parent;
     86 	struct sa11x0_attach_args *sa = aux;
     87 
     88 	sc->sc_iot = psc->sc_iot;
     89 	sc->sc_gpioh = psc->sc_gpioh;
     90 	sc->sc_parent = psc;
     91 
     92 	if (bus_space_map(sc->sc_iot, sa->sa_addr, sa->sa_size, 0,
     93 	    &sc->sc_ssph)) {
     94 		printf(": unable to map SSP registers\n");
     95 		return;
     96 	}
     97 
     98 	printf("\n");
     99 
    100 	config_search_ia(j720ssp_search, self, "j720ssp", NULL);
    101 }
    102 
    103 static int
    104 j720ssp_search(struct device *parent, struct cfdata *cf,
    105     const int *ldesc, void *aux)
    106 {
    107 
    108 	if (config_match(parent, cf, NULL) > 0)
    109 		config_attach(parent, cf, NULL, j720ssp_print);
    110 
    111 	return 0;
    112 }
    113 
    114 static int
    115 j720ssp_print(void *aux, const char *pnp)
    116 {
    117 
    118 	return pnp ? QUIET : UNCONF;
    119 }
    120 
    121 int
    122 j720ssp_readwrite(struct j720ssp_softc *sc, int drainfifo, int in,
    123     int *out, int wait)
    124 {
    125 	int timeout;
    126 
    127 	while (!(bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_SR) & SR_TNF))
    128 		continue;
    129 
    130 	timeout = 400000;
    131 	while (bus_space_read_4(sc->sc_iot, sc->sc_gpioh, SAGPIO_PLR) & 0x400)
    132 		if (--timeout == 0) {
    133 			DPRINTF(("j720ssp_readwrite: timeout 0\n"));
    134 			return -1;
    135 		}
    136 	if (drainfifo) {
    137 		while (bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_SR) &
    138 		      SR_RNE)
    139 			bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_DR);
    140 		delay(wait);
    141 	}
    142 
    143 	bus_space_write_4(sc->sc_iot, sc->sc_ssph, SASSP_DR, in);
    144 
    145 	delay(wait);
    146 	timeout = 100000;
    147 	while (!(bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_SR) & SR_RNE))
    148 		if (--timeout == 0) {
    149 			DPRINTF(("j720ssp_readwrite: timeout 1\n"));
    150 			return -1;
    151 		}
    152 
    153 	*out = bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_DR);
    154 
    155 	return 0;
    156 }
    157