1 /* $NetBSD: j720ssp.c,v 1.32 2009/05/29 14:15:45 rjs 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 1.32 2009/05/29 14:15:45 rjs 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_ia(j720ssp_search, self, "j720ssp", NULL); 101 } 102 103 static int 104 j720ssp_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux) 105 { 106 107 if (config_match(parent, cf, NULL) > 0) 108 config_attach(parent, cf, NULL, j720ssp_print); 109 110 return 0; 111 } 112 113 static int 114 j720ssp_print(void *aux, const char *pnp) 115 { 116 117 return pnp ? QUIET : UNCONF; 118 } 119 120 int 121 j720ssp_readwrite(struct j720ssp_softc *sc, int drainfifo, int in, 122 int *out, int wait) 123 { 124 int timeout; 125 126 while (!(bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_SR) & SR_TNF)) 127 continue; 128 129 timeout = 400000; 130 while (bus_space_read_4(sc->sc_iot, sc->sc_gpioh, SAGPIO_PLR) & 0x400) 131 if (--timeout == 0) { 132 DPRINTF(("j720ssp_readwrite: timeout 0\n")); 133 return -1; 134 } 135 if (drainfifo) { 136 while (bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_SR) & 137 SR_RNE) 138 bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_DR); 139 delay(wait); 140 } 141 142 BIT_INVERT(in); 143 bus_space_write_4(sc->sc_iot, sc->sc_ssph, SASSP_DR, in << 8); 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 BIT_INVERT(*out); 155 156 return 0; 157 } 158