nslu2_iic.c revision 1.1.2.2
1 1.1.2.2 yamt /* $NetBSD: nslu2_iic.c,v 1.1.2.2 2006/03/01 09:27:46 yamt Exp $ */ 2 1.1.2.2 yamt 3 1.1.2.2 yamt /*- 4 1.1.2.2 yamt * Copyright (c) 2006 The NetBSD Foundation, Inc. 5 1.1.2.2 yamt * All rights reserved. 6 1.1.2.2 yamt * 7 1.1.2.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.1.2.2 yamt * by Steve C. Woodford. 9 1.1.2.2 yamt * 10 1.1.2.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.1.2.2 yamt * modification, are permitted provided that the following conditions 12 1.1.2.2 yamt * are met: 13 1.1.2.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.1.2.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.1.2.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.1.2.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.1.2.2 yamt * documentation and/or other materials provided with the distribution. 18 1.1.2.2 yamt * 3. All advertising materials mentioning features or use of this software 19 1.1.2.2 yamt * must display the following acknowledgement: 20 1.1.2.2 yamt * This product includes software developed by the NetBSD 21 1.1.2.2 yamt * Foundation, Inc. and its contributors. 22 1.1.2.2 yamt * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.1.2.2 yamt * contributors may be used to endorse or promote products derived 24 1.1.2.2 yamt * from this software without specific prior written permission. 25 1.1.2.2 yamt * 26 1.1.2.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.1.2.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.1.2.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.1.2.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.1.2.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.1.2.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.1.2.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.1.2.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.1.2.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.1.2.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.1.2.2 yamt * POSSIBILITY OF SUCH DAMAGE. 37 1.1.2.2 yamt */ 38 1.1.2.2 yamt 39 1.1.2.2 yamt #include <sys/param.h> 40 1.1.2.2 yamt #include <sys/systm.h> 41 1.1.2.2 yamt #include <sys/kernel.h> 42 1.1.2.2 yamt #include <sys/device.h> 43 1.1.2.2 yamt #include <sys/lock.h> 44 1.1.2.2 yamt 45 1.1.2.2 yamt #include <machine/bus.h> 46 1.1.2.2 yamt 47 1.1.2.2 yamt #include <dev/i2c/i2cvar.h> 48 1.1.2.2 yamt #include <dev/i2c/i2c_bitbang.h> 49 1.1.2.2 yamt 50 1.1.2.2 yamt #include <arm/xscale/ixp425reg.h> 51 1.1.2.2 yamt #include <arm/xscale/ixp425var.h> 52 1.1.2.2 yamt 53 1.1.2.2 yamt #include <evbarm/nslu2/nslu2reg.h> 54 1.1.2.2 yamt 55 1.1.2.2 yamt struct slugiic_softc { 56 1.1.2.2 yamt struct device sc_dev; 57 1.1.2.2 yamt struct i2c_controller sc_ic; 58 1.1.2.2 yamt struct i2c_bitbang_ops sc_ibo; 59 1.1.2.2 yamt struct lock sc_lock; 60 1.1.2.2 yamt uint32_t sc_dirout; 61 1.1.2.2 yamt }; 62 1.1.2.2 yamt 63 1.1.2.2 yamt static int 64 1.1.2.2 yamt slugiic_acquire_bus(void *arg, int flags) 65 1.1.2.2 yamt { 66 1.1.2.2 yamt struct slugiic_softc *sc = arg; 67 1.1.2.2 yamt 68 1.1.2.2 yamt if (flags & I2C_F_POLL) 69 1.1.2.2 yamt return (0); 70 1.1.2.2 yamt 71 1.1.2.2 yamt return (lockmgr(&sc->sc_lock, LK_EXCLUSIVE, NULL)); 72 1.1.2.2 yamt } 73 1.1.2.2 yamt 74 1.1.2.2 yamt static void 75 1.1.2.2 yamt slugiic_release_bus(void *arg, int flags) 76 1.1.2.2 yamt { 77 1.1.2.2 yamt struct slugiic_softc *sc = arg; 78 1.1.2.2 yamt 79 1.1.2.2 yamt if (flags & I2C_F_POLL) 80 1.1.2.2 yamt return; 81 1.1.2.2 yamt 82 1.1.2.2 yamt (void) lockmgr(&sc->sc_lock, LK_RELEASE, NULL); 83 1.1.2.2 yamt } 84 1.1.2.2 yamt 85 1.1.2.2 yamt static int 86 1.1.2.2 yamt slugiic_send_start(void *arg, int flags) 87 1.1.2.2 yamt { 88 1.1.2.2 yamt struct slugiic_softc *sc = arg; 89 1.1.2.2 yamt 90 1.1.2.2 yamt return (i2c_bitbang_send_start(sc, flags, &sc->sc_ibo)); 91 1.1.2.2 yamt } 92 1.1.2.2 yamt 93 1.1.2.2 yamt static int 94 1.1.2.2 yamt slugiic_send_stop(void *arg, int flags) 95 1.1.2.2 yamt { 96 1.1.2.2 yamt struct slugiic_softc *sc = arg; 97 1.1.2.2 yamt 98 1.1.2.2 yamt return (i2c_bitbang_send_stop(sc, flags, &sc->sc_ibo)); 99 1.1.2.2 yamt } 100 1.1.2.2 yamt 101 1.1.2.2 yamt static int 102 1.1.2.2 yamt slugiic_initiate_xfer(void *arg, i2c_addr_t addr, int flags) 103 1.1.2.2 yamt { 104 1.1.2.2 yamt struct slugiic_softc *sc = arg; 105 1.1.2.2 yamt 106 1.1.2.2 yamt return (i2c_bitbang_initiate_xfer(sc, addr, flags, &sc->sc_ibo)); 107 1.1.2.2 yamt } 108 1.1.2.2 yamt 109 1.1.2.2 yamt static int 110 1.1.2.2 yamt slugiic_read_byte(void *arg, uint8_t *vp, int flags) 111 1.1.2.2 yamt { 112 1.1.2.2 yamt struct slugiic_softc *sc = arg; 113 1.1.2.2 yamt 114 1.1.2.2 yamt return (i2c_bitbang_read_byte(sc, vp, flags, &sc->sc_ibo)); 115 1.1.2.2 yamt } 116 1.1.2.2 yamt 117 1.1.2.2 yamt static int 118 1.1.2.2 yamt slugiic_write_byte(void *arg, uint8_t v, int flags) 119 1.1.2.2 yamt { 120 1.1.2.2 yamt struct slugiic_softc *sc = arg; 121 1.1.2.2 yamt 122 1.1.2.2 yamt return (i2c_bitbang_write_byte(sc, v, flags, &sc->sc_ibo)); 123 1.1.2.2 yamt } 124 1.1.2.2 yamt 125 1.1.2.2 yamt static void 126 1.1.2.2 yamt slugiic_set_dir(void *arg, uint32_t bits) 127 1.1.2.2 yamt { 128 1.1.2.2 yamt struct slugiic_softc *sc = arg; 129 1.1.2.2 yamt uint32_t reg; 130 1.1.2.2 yamt int s; 131 1.1.2.2 yamt 132 1.1.2.2 yamt if (sc->sc_dirout == (bits ^ GPIO_I2C_SDA_BIT)) 133 1.1.2.2 yamt return; 134 1.1.2.2 yamt 135 1.1.2.2 yamt s = splhigh(); 136 1.1.2.2 yamt 137 1.1.2.2 yamt sc->sc_dirout = bits ^ GPIO_I2C_SDA_BIT; 138 1.1.2.2 yamt 139 1.1.2.2 yamt reg = GPIO_CONF_READ_4(ixp425_softc, IXP425_GPIO_GPOER); 140 1.1.2.2 yamt reg &= ~GPIO_I2C_SDA_BIT; 141 1.1.2.2 yamt GPIO_CONF_WRITE_4(ixp425_softc, IXP425_GPIO_GPOER, reg | bits); 142 1.1.2.2 yamt 143 1.1.2.2 yamt splx(s); 144 1.1.2.2 yamt } 145 1.1.2.2 yamt 146 1.1.2.2 yamt static void 147 1.1.2.2 yamt slugiic_set_bits(void *arg, uint32_t bits) 148 1.1.2.2 yamt { 149 1.1.2.2 yamt struct slugiic_softc *sc = arg; 150 1.1.2.2 yamt uint32_t reg; 151 1.1.2.2 yamt int s; 152 1.1.2.2 yamt 153 1.1.2.2 yamt if (sc->sc_dirout == 0 && !(bits & GPIO_I2C_SDA_BIT)) 154 1.1.2.2 yamt bits |= GPIO_I2C_SDA_BIT; 155 1.1.2.2 yamt 156 1.1.2.2 yamt s = splhigh(); 157 1.1.2.2 yamt 158 1.1.2.2 yamt reg = GPIO_CONF_READ_4(ixp425_softc, IXP425_GPIO_GPOUTR); 159 1.1.2.2 yamt reg &= ~(GPIO_I2C_SDA_BIT | GPIO_I2C_SCL_BIT); 160 1.1.2.2 yamt GPIO_CONF_WRITE_4(ixp425_softc, IXP425_GPIO_GPOUTR, reg | bits); 161 1.1.2.2 yamt 162 1.1.2.2 yamt splx(s); 163 1.1.2.2 yamt } 164 1.1.2.2 yamt 165 1.1.2.2 yamt static uint32_t 166 1.1.2.2 yamt slugiic_read_bits(void *arg) 167 1.1.2.2 yamt { 168 1.1.2.2 yamt uint32_t reg; 169 1.1.2.2 yamt 170 1.1.2.2 yamt reg = GPIO_CONF_READ_4(ixp425_softc, IXP425_GPIO_GPINR); 171 1.1.2.2 yamt return (reg & (GPIO_I2C_SDA_BIT | GPIO_I2C_SCL_BIT)); 172 1.1.2.2 yamt } 173 1.1.2.2 yamt 174 1.1.2.2 yamt static void 175 1.1.2.2 yamt slugiic_deferred_attach(struct device *device) 176 1.1.2.2 yamt { 177 1.1.2.2 yamt struct slugiic_softc *sc = (struct slugiic_softc *)device; 178 1.1.2.2 yamt struct i2cbus_attach_args iba; 179 1.1.2.2 yamt uint32_t reg; 180 1.1.2.2 yamt 181 1.1.2.2 yamt reg = GPIO_CONF_READ_4(ixp425_softc, IXP425_GPIO_GPOUTR); 182 1.1.2.2 yamt reg |= GPIO_I2C_SDA_BIT | GPIO_I2C_SCL_BIT; 183 1.1.2.2 yamt GPIO_CONF_WRITE_4(ixp425_softc, IXP425_GPIO_GPOUTR, reg); 184 1.1.2.2 yamt 185 1.1.2.2 yamt reg = GPIO_CONF_READ_4(ixp425_softc, IXP425_GPIO_GPOER); 186 1.1.2.2 yamt reg &= ~GPIO_I2C_SCL_BIT; 187 1.1.2.2 yamt reg |= GPIO_I2C_SDA_BIT; 188 1.1.2.2 yamt GPIO_CONF_WRITE_4(ixp425_softc, IXP425_GPIO_GPOER, reg); 189 1.1.2.2 yamt 190 1.1.2.2 yamt iba.iba_name = "iic"; 191 1.1.2.2 yamt iba.iba_tag = &sc->sc_ic; 192 1.1.2.2 yamt (void) config_found(&sc->sc_dev, &iba, iicbus_print); 193 1.1.2.2 yamt } 194 1.1.2.2 yamt 195 1.1.2.2 yamt static int 196 1.1.2.2 yamt slugiic_match(struct device *parent, struct cfdata *cf, void *arg) 197 1.1.2.2 yamt { 198 1.1.2.2 yamt 199 1.1.2.2 yamt return (1); 200 1.1.2.2 yamt } 201 1.1.2.2 yamt 202 1.1.2.2 yamt static void 203 1.1.2.2 yamt slugiic_attach(struct device *parent, struct device *self, void *arg) 204 1.1.2.2 yamt { 205 1.1.2.2 yamt struct slugiic_softc *sc = (struct slugiic_softc *)self; 206 1.1.2.2 yamt 207 1.1.2.2 yamt aprint_naive("\n"); 208 1.1.2.2 yamt aprint_normal(": I2C bus\n"); 209 1.1.2.2 yamt 210 1.1.2.2 yamt sc->sc_ic.ic_cookie = sc; 211 1.1.2.2 yamt sc->sc_ic.ic_acquire_bus = slugiic_acquire_bus; 212 1.1.2.2 yamt sc->sc_ic.ic_release_bus = slugiic_release_bus; 213 1.1.2.2 yamt sc->sc_ic.ic_exec = NULL; 214 1.1.2.2 yamt sc->sc_ic.ic_send_start = slugiic_send_start; 215 1.1.2.2 yamt sc->sc_ic.ic_send_stop = slugiic_send_stop; 216 1.1.2.2 yamt sc->sc_ic.ic_initiate_xfer = slugiic_initiate_xfer; 217 1.1.2.2 yamt sc->sc_ic.ic_read_byte = slugiic_read_byte; 218 1.1.2.2 yamt sc->sc_ic.ic_write_byte = slugiic_write_byte; 219 1.1.2.2 yamt 220 1.1.2.2 yamt sc->sc_ibo.ibo_set_dir = slugiic_set_dir; 221 1.1.2.2 yamt sc->sc_ibo.ibo_set_bits = slugiic_set_bits; 222 1.1.2.2 yamt sc->sc_ibo.ibo_read_bits = slugiic_read_bits; 223 1.1.2.2 yamt sc->sc_ibo.ibo_bits[I2C_BIT_SDA] = GPIO_I2C_SDA_BIT; 224 1.1.2.2 yamt sc->sc_ibo.ibo_bits[I2C_BIT_SCL] = GPIO_I2C_SCL_BIT; 225 1.1.2.2 yamt sc->sc_ibo.ibo_bits[I2C_BIT_OUTPUT] = 0; 226 1.1.2.2 yamt sc->sc_ibo.ibo_bits[I2C_BIT_INPUT] = GPIO_I2C_SDA_BIT; 227 1.1.2.2 yamt 228 1.1.2.2 yamt lockinit(&sc->sc_lock, PRIBIO|PCATCH, "slugiiclk", 0, 0); 229 1.1.2.2 yamt 230 1.1.2.2 yamt sc->sc_dirout = 0; 231 1.1.2.2 yamt 232 1.1.2.2 yamt /* 233 1.1.2.2 yamt * Defer until ixp425_softc has been initialised 234 1.1.2.2 yamt */ 235 1.1.2.2 yamt config_interrupts(self, slugiic_deferred_attach); 236 1.1.2.2 yamt } 237 1.1.2.2 yamt 238 1.1.2.2 yamt CFATTACH_DECL(slugiic, sizeof(struct slugiic_softc), 239 1.1.2.2 yamt slugiic_match, slugiic_attach, NULL, NULL); 240
Indexes created Sun Oct 19 02:09:48 GMT 2025