Home | History | Annotate | Line # | Download | only in dev
j720ssp.c revision 1.33 
      1 /*	$NetBSD: j720ssp.c,v 1.33 2021/04/24 23:36:37 thorpej 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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /* Jornada 720 SSP port. */
     33 
     34 #include <sys/cdefs.h>
     35 __KERNEL_RCSID(0, "$NetBSD: j720ssp.c,v 1.33 2021/04/24 23:36:37 thorpej Exp $");
     36 
     37 #include <sys/param.h>
     38 #include <sys/systm.h>
     39 #include <sys/device.h>
     40 
     41 #include <arm/sa11x0/sa11x0_var.h>
     42 #include <arm/sa11x0/sa11x0_gpioreg.h>
     43 #include <arm/sa11x0/sa11x0_ppcreg.h>
     44 #include <arm/sa11x0/sa11x0_sspreg.h>
     45 
     46 #include <hpcarm/dev/j720sspvar.h>
     47 
     48 #ifdef DEBUG
     49 #define DPRINTF(arg)	aprint_normal arg
     50 #else
     51 #define DPRINTF(arg)	/* nothing */
     52 #endif
     53 
     54 #define BIT_INVERT(x)							\
     55 	do {								\
     56 		(x) = ((((x) & 0xf0) >> 4) | (((x) & 0x0f) << 4));	\
     57 		(x) = ((((x) & 0xcc) >> 2) | (((x) & 0x33) << 2));	\
     58 		(x) = ((((x) & 0xaa) >> 1) | (((x) & 0x55) << 1));	\
     59 	} while (0)
     60 
     61 static int	j720ssp_match(device_t, cfdata_t, void *);
     62 static void	j720ssp_attach(device_t, device_t, void *);
     63 static int	j720ssp_search(device_t, cfdata_t, const int *, void *);
     64 static int	j720ssp_print(void *, const char *);
     65 
     66 CFATTACH_DECL_NEW(j720ssp, sizeof(struct j720ssp_softc),
     67     j720ssp_match, j720ssp_attach, NULL, NULL);
     68 
     69 
     70 static int
     71 j720ssp_match(device_t parent, cfdata_t cf, void *aux)
     72 {
     73 
     74 	if (strcmp(cf->cf_name, "j720ssp") != 0)
     75 		return 0;
     76 
     77 	return 1;
     78 }
     79 
     80 static void
     81 j720ssp_attach(device_t parent, device_t self, void *aux)
     82 {
     83 	struct j720ssp_softc *sc = device_private(self);
     84 	struct sa11x0_softc *psc = device_private(parent);
     85 	struct sa11x0_attach_args *sa = aux;
     86 
     87 	sc->sc_dev = self;
     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 		aprint_normal(": unable to map SSP registers\n");
     95 		return;
     96 	}
     97 
     98 	aprint_normal("\n");
     99 
    100 	config_search(self, NULL,
    101 	    CFARG_SEARCH, j720ssp_search,
    102 	    CFARG_EOL);
    103 }
    104 
    105 static int
    106 j720ssp_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux)
    107 {
    108 
    109 	if (config_probe(parent, cf, NULL))
    110 		config_attach(parent, cf, NULL, j720ssp_print, CFARG_EOL);
    111 
    112 	return 0;
    113 }
    114 
    115 static int
    116 j720ssp_print(void *aux, const char *pnp)
    117 {
    118 
    119 	return pnp ? QUIET : UNCONF;
    120 }
    121 
    122 int
    123 j720ssp_readwrite(struct j720ssp_softc *sc, int drainfifo, int in,
    124     int *out, int wait)
    125 {
    126 	int timeout;
    127 
    128 	while (!(bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_SR) & SR_TNF))
    129 		continue;
    130 
    131 	timeout = 400000;
    132 	while (bus_space_read_4(sc->sc_iot, sc->sc_gpioh, SAGPIO_PLR) & 0x400)
    133 		if (--timeout == 0) {
    134 			DPRINTF(("j720ssp_readwrite: timeout 0\n"));
    135 			return -1;
    136 		}
    137 	if (drainfifo) {
    138 		while (bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_SR) &
    139 		      SR_RNE)
    140 			bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_DR);
    141 		delay(wait);
    142 	}
    143 
    144 	BIT_INVERT(in);
    145 	bus_space_write_4(sc->sc_iot, sc->sc_ssph, SASSP_DR, in << 8);
    146 
    147 	delay(wait);
    148 	timeout = 100000;
    149 	while (!(bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_SR) & SR_RNE))
    150 		if (--timeout == 0) {
    151 			DPRINTF(("j720ssp_readwrite: timeout 1\n"));
    152 			return -1;
    153 		}
    154 
    155 	*out = bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_DR);
    156 	BIT_INVERT(*out);
    157 
    158 	return 0;
    159 }
    160