ziic.c revision 1.1
1 /* $NetBSD: ziic.c,v 1.1 2011/06/19 16:20:09 nonaka Exp $ */ 2 3 /*- 4 * Copyright (c) 2011 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by NONAKA Kimihiro. 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 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: ziic.c,v 1.1 2011/06/19 16:20:09 nonaka Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/device.h> 38 #include <sys/bus.h> 39 #include <sys/mutex.h> 40 41 #include <dev/i2c/i2cvar.h> 42 43 #include <arm/xscale/pxa2x0reg.h> 44 #include <arm/xscale/pxa2x0var.h> 45 #include <arm/xscale/pxa2x0_i2c.h> 46 47 #ifdef PXAIIC_DEBUG 48 #define DPRINTF(s) printf s 49 #else 50 #define DPRINTF(s) do { } while (/*CONSTCOND*/0) 51 #endif 52 53 struct pxaiic_softc { 54 struct pxa2x0_i2c_softc sc_pxa_i2c; 55 void * sc_ih; 56 57 struct i2c_controller sc_i2c; 58 kmutex_t sc_buslock; 59 }; 60 61 static int pxaiic_match(device_t, cfdata_t, void *); 62 static void pxaiic_attach(device_t, device_t, void *); 63 64 CFATTACH_DECL_NEW(pxaiic, sizeof(struct pxaiic_softc), 65 pxaiic_match, pxaiic_attach, NULL, NULL); 66 67 static int pxaiic_acquire_bus(void *, int); 68 static void pxaiic_release_bus(void *, int); 69 static int pxaiic_send_start(void *, int); 70 static int pxaiic_send_stop(void *, int); 71 static int pxaiic_initiate_xfer(void *, uint16_t, int); 72 static int pxaiic_read_byte(void *, uint8_t *, int); 73 static int pxaiic_write_byte(void *, uint8_t, int); 74 75 static int 76 pxaiic_match(device_t parent, cfdata_t cf, void *aux) 77 { 78 struct pxaip_attach_args *pxa = aux; 79 80 if (strcmp(cf->cf_name, pxa->pxa_name)) 81 return 0; 82 83 pxa->pxa_size = PXA2X0_I2C_SIZE; 84 return 1; 85 } 86 87 static void 88 pxaiic_attach(device_t parent, device_t self, void *aux) 89 { 90 struct pxaiic_softc *sc = device_private(self); 91 struct pxa2x0_i2c_softc *psc = &sc->sc_pxa_i2c; 92 struct pxaip_attach_args *pxa = aux; 93 struct i2cbus_attach_args iba; 94 95 aprint_normal(": I2C controller\n"); 96 aprint_naive("\n"); 97 98 psc->sc_dev = self; 99 psc->sc_iot = pxa->pxa_iot; 100 psc->sc_size = pxa->pxa_size; 101 psc->sc_flags = 0; 102 if (pxa2x0_i2c_attach_sub(psc)) { 103 aprint_error_dev(self, "unable to attach PXA I2C controller\n"); 104 return; 105 } 106 107 mutex_init(&sc->sc_buslock, MUTEX_DEFAULT, IPL_TTY); 108 109 #if 0 110 sc->sc_ih = pxa2x0_intr_establish(PXA2X0_INT_I2C, IPL_TTY, 111 pxa2x0_i2c_intr, &psc); 112 if (sc->sc_ih == NULL) { 113 aprint_error_dev(self, "unable to establish intr\n"); 114 return; /* XXX: mutex_destroy, bus_space_unmap */ 115 } 116 #endif 117 118 /* Initialize i2c_controller */ 119 sc->sc_i2c.ic_cookie = sc; 120 sc->sc_i2c.ic_acquire_bus = pxaiic_acquire_bus; 121 sc->sc_i2c.ic_release_bus = pxaiic_release_bus; 122 sc->sc_i2c.ic_send_start = pxaiic_send_start; 123 sc->sc_i2c.ic_send_stop = pxaiic_send_stop; 124 sc->sc_i2c.ic_initiate_xfer = pxaiic_initiate_xfer; 125 sc->sc_i2c.ic_read_byte = pxaiic_read_byte; 126 sc->sc_i2c.ic_write_byte = pxaiic_write_byte; 127 sc->sc_i2c.ic_exec = NULL; 128 129 iba.iba_tag = &sc->sc_i2c; 130 (void)config_found_ia(psc->sc_dev, "i2cbus", &iba, iicbus_print); 131 } 132 133 static int 134 pxaiic_acquire_bus(void *cookie, int flags) 135 { 136 struct pxaiic_softc *sc = cookie; 137 struct pxa2x0_i2c_softc *psc = &sc->sc_pxa_i2c; 138 139 mutex_enter(&sc->sc_buslock); 140 pxa2x0_i2c_open(psc); 141 142 return 0; 143 } 144 145 static void 146 pxaiic_release_bus(void *cookie, int flags) 147 { 148 struct pxaiic_softc *sc = cookie; 149 struct pxa2x0_i2c_softc *psc = &sc->sc_pxa_i2c; 150 151 pxa2x0_i2c_close(psc); 152 mutex_exit(&sc->sc_buslock); 153 } 154 155 static int 156 pxaiic_send_start(void *cookie, int flags) 157 { 158 struct pxaiic_softc *sc = cookie; 159 struct pxa2x0_i2c_softc *psc = &sc->sc_pxa_i2c; 160 161 return pxa2x0_i2c_send_start(psc, flags); 162 } 163 164 static int 165 pxaiic_send_stop(void *cookie, int flags) 166 { 167 struct pxaiic_softc *sc = cookie; 168 struct pxa2x0_i2c_softc *psc = &sc->sc_pxa_i2c; 169 170 return pxa2x0_i2c_send_stop(psc, flags); 171 } 172 173 static int 174 pxaiic_initiate_xfer(void *cookie, uint16_t addr, int flags) 175 { 176 struct pxaiic_softc *sc = cookie; 177 struct pxa2x0_i2c_softc *psc = &sc->sc_pxa_i2c; 178 179 return pxa2x0_i2c_initiate_xfer(psc, addr, flags); 180 } 181 182 static int 183 pxaiic_read_byte(void *cookie, uint8_t *bytep, int flags) 184 { 185 struct pxaiic_softc *sc = cookie; 186 struct pxa2x0_i2c_softc *psc = &sc->sc_pxa_i2c; 187 188 return pxa2x0_i2c_read_byte(psc, bytep, flags); 189 } 190 191 static int 192 pxaiic_write_byte(void *cookie, uint8_t byte, int flags) 193 { 194 struct pxaiic_softc *sc = cookie; 195 struct pxa2x0_i2c_softc *psc = &sc->sc_pxa_i2c; 196 197 return pxa2x0_i2c_write_byte(psc, byte, flags); 198 } 199
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