1 /* $NetBSD: j720ssp.c,v 1.29 2006/03/04 14:09:36 peter 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 1.29 2006/03/04 14:09:36 peter 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