1 /* $NetBSD: j720ssp.c,v 1.34 2021/08/07 16:18:53 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 1.34 2021/08/07 16:18:53 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 CFARGS(.search = j720ssp_search)); 102 } 103 104 static int 105 j720ssp_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux) 106 { 107 108 if (config_probe(parent, cf, NULL)) 109 config_attach(parent, cf, NULL, j720ssp_print, CFARGS_NONE); 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 BIT_INVERT(in); 144 bus_space_write_4(sc->sc_iot, sc->sc_ssph, SASSP_DR, in << 8); 145 146 delay(wait); 147 timeout = 100000; 148 while (!(bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_SR) & SR_RNE)) 149 if (--timeout == 0) { 150 DPRINTF(("j720ssp_readwrite: timeout 1\n")); 151 return -1; 152 } 153 154 *out = bus_space_read_4(sc->sc_iot, sc->sc_ssph, SASSP_DR); 155 BIT_INVERT(*out); 156 157 return 0; 158 } 159