1 /* $NetBSD: auvitek_i2c.c,v 1.3 2011/10/02 16:30:58 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2010 Jared D. McNeill <jmcneill@invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * Auvitek AU0828 USB controller - I2C access ops 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: auvitek_i2c.c,v 1.3 2011/10/02 16:30:58 jmcneill Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/device.h> 39 #include <sys/conf.h> 40 #include <sys/bus.h> 41 #include <sys/module.h> 42 43 #include <dev/usb/usb.h> 44 #include <dev/usb/usbdi.h> 45 #include <dev/usb/usbdi_util.h> 46 #include <dev/usb/usbdevs.h> 47 48 #include <dev/i2c/i2cvar.h> 49 50 #include <dev/usb/auvitekreg.h> 51 #include <dev/usb/auvitekvar.h> 52 53 /* #define AUVITEK_I2C_DEBUG */ 54 55 static int auvitek_i2c_acquire_bus(void *, int); 56 static void auvitek_i2c_release_bus(void *, int); 57 static int auvitek_i2c_exec(void *, i2c_op_t, i2c_addr_t, 58 const void *, size_t, void *, size_t, int); 59 60 static int auvitek_i2c_read(struct auvitek_softc *, i2c_addr_t, 61 uint8_t *, size_t); 62 static int auvitek_i2c_write(struct auvitek_softc *, i2c_addr_t, 63 const uint8_t *, size_t); 64 static bool auvitek_i2c_wait(struct auvitek_softc *); 65 static bool auvitek_i2c_wait_rdack(struct auvitek_softc *); 66 static bool auvitek_i2c_wait_rddone(struct auvitek_softc *); 67 static bool auvitek_i2c_wait_wrdone(struct auvitek_softc *); 68 69 int 70 auvitek_i2c_attach(struct auvitek_softc *sc) 71 { 72 mutex_init(&sc->sc_i2c_lock, MUTEX_DEFAULT, IPL_NONE); 73 sc->sc_i2c.ic_cookie = sc; 74 sc->sc_i2c.ic_acquire_bus = auvitek_i2c_acquire_bus; 75 sc->sc_i2c.ic_release_bus = auvitek_i2c_release_bus; 76 sc->sc_i2c.ic_exec = auvitek_i2c_exec; 77 78 auvitek_i2c_rescan(sc, NULL, NULL); 79 80 return 0; 81 } 82 83 int 84 auvitek_i2c_detach(struct auvitek_softc *sc, int flags) 85 { 86 mutex_destroy(&sc->sc_i2c_lock); 87 88 if (sc->sc_i2cdev) 89 config_detach(sc->sc_i2cdev, flags); 90 91 return 0; 92 } 93 94 void 95 auvitek_i2c_rescan(struct auvitek_softc *sc, const char *ifattr, 96 const int *locs) 97 { 98 #ifdef AUVITEK_I2C_DEBUG 99 struct i2cbus_attach_args iba; 100 101 if (ifattr_match(ifattr, "i2cbus") && sc->sc_i2cdev == NULL) { 102 memset(&iba, 0, sizeof(iba)); 103 iba.iba_type = I2C_TYPE_SMBUS; 104 iba.iba_tag = &sc->sc_i2c; 105 sc->sc_i2cdev = config_found_ia(sc->sc_dev, "i2cbus", 106 &iba, iicbus_print); 107 } 108 #endif 109 } 110 111 void 112 auvitek_i2c_childdet(struct auvitek_softc *sc, device_t child) 113 { 114 if (sc->sc_i2cdev == child) 115 sc->sc_i2cdev = NULL; 116 } 117 118 static int 119 auvitek_i2c_acquire_bus(void *opaque, int flags) 120 { 121 struct auvitek_softc *sc = opaque; 122 123 if (flags & I2C_F_POLL) { 124 if (!mutex_tryenter(&sc->sc_i2c_lock)) 125 return EBUSY; 126 } else { 127 mutex_enter(&sc->sc_i2c_lock); 128 } 129 130 return 0; 131 } 132 133 static void 134 auvitek_i2c_release_bus(void *opaque, int flags) 135 { 136 struct auvitek_softc *sc = opaque; 137 138 mutex_exit(&sc->sc_i2c_lock); 139 } 140 141 static int 142 auvitek_i2c_exec(void *opaque, i2c_op_t op, i2c_addr_t addr, 143 const void *cmd, size_t cmdlen, void *vbuf, size_t buflen, int flags) 144 { 145 struct auvitek_softc *sc = opaque; 146 147 if (I2C_OP_READ_P(op)) 148 return auvitek_i2c_read(sc, addr, vbuf, buflen); 149 else 150 return auvitek_i2c_write(sc, addr, cmd, cmdlen); 151 } 152 153 static int 154 auvitek_i2c_read(struct auvitek_softc *sc, i2c_addr_t addr, 155 uint8_t *buf, size_t buflen) 156 { 157 uint8_t v; 158 unsigned int i; 159 160 //KASSERT(mutex_owned(&sc->sc_i2c_lock)); 161 162 auvitek_write_1(sc, AU0828_REG_I2C_MBMODE, 1); 163 auvitek_write_1(sc, AU0828_REG_I2C_CLKDIV, sc->sc_i2c_clkdiv); 164 auvitek_write_1(sc, AU0828_REG_I2C_DSTADDR, addr << 1); 165 166 if (buflen == 0) { 167 auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER, 168 AU0828_I2C_TRIGGER_RD); 169 if (auvitek_i2c_wait_rdack(sc) == false) 170 return EBUSY; 171 return 0; 172 } 173 174 for (i = 0; i < buflen; i++) { 175 v = AU0828_I2C_TRIGGER_RD; 176 if (i < (buflen - 1)) 177 v |= AU0828_I2C_TRIGGER_HOLD; 178 auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER, v); 179 180 if (auvitek_i2c_wait_rddone(sc) == false) 181 return EBUSY; 182 183 buf[i] = auvitek_read_1(sc, AU0828_REG_I2C_FIFORD); 184 } 185 186 if (auvitek_i2c_wait(sc) == false) 187 return EBUSY; 188 189 return 0; 190 } 191 192 static int 193 auvitek_i2c_write(struct auvitek_softc *sc, i2c_addr_t addr, 194 const uint8_t *buf, size_t buflen) 195 { 196 uint8_t v; 197 unsigned int i, fifolen; 198 199 //KASSERT(mutex_owned(&sc->sc_i2c_lock)); 200 201 auvitek_write_1(sc, AU0828_REG_I2C_MBMODE, 1); 202 auvitek_write_1(sc, AU0828_REG_I2C_CLKDIV, sc->sc_i2c_clkdiv); 203 auvitek_write_1(sc, AU0828_REG_I2C_DSTADDR, addr << 1); 204 205 if (buflen == 0) { 206 auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER, 207 AU0828_I2C_TRIGGER_RD); 208 if (auvitek_i2c_wait(sc) == false) 209 return EBUSY; 210 if (auvitek_i2c_wait_rdack(sc) == false) 211 return EBUSY; 212 return 0; 213 } 214 215 fifolen = 0; 216 for (i = 0; i < buflen; i++) { 217 v = AU0828_I2C_TRIGGER_WR; 218 if (i < (buflen - 1)) 219 v |= AU0828_I2C_TRIGGER_HOLD; 220 221 auvitek_write_1(sc, AU0828_REG_I2C_FIFOWR, buf[i]); 222 ++fifolen; 223 224 if (fifolen == 4 || i == (buflen - 1)) { 225 auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER, v); 226 fifolen = 0; 227 228 if (auvitek_i2c_wait_wrdone(sc) == false) 229 return EBUSY; 230 } 231 } 232 233 if (auvitek_i2c_wait(sc) == false) 234 return EBUSY; 235 236 return 0; 237 } 238 239 static bool 240 auvitek_i2c_wait(struct auvitek_softc *sc) 241 { 242 uint8_t status; 243 int retry = 1000; 244 245 while (--retry > 0) { 246 status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS); 247 if (!(status & AU0828_I2C_STATUS_BUSY)) 248 break; 249 delay(10); 250 } 251 if (retry == 0) 252 return false; 253 254 return true; 255 } 256 257 static bool 258 auvitek_i2c_wait_rdack(struct auvitek_softc *sc) 259 { 260 uint8_t status; 261 int retry = 1000; 262 263 while (--retry > 0) { 264 status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS); 265 if (!(status & AU0828_I2C_STATUS_NO_RD_ACK)) 266 break; 267 delay(10); 268 } 269 if (retry == 0) 270 return false; 271 272 return true; 273 } 274 275 static bool 276 auvitek_i2c_wait_rddone(struct auvitek_softc *sc) 277 { 278 uint8_t status; 279 int retry = 1000; 280 281 while (--retry > 0) { 282 status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS); 283 if (status & AU0828_I2C_STATUS_RD_DONE) 284 break; 285 delay(10); 286 } 287 if (retry == 0) 288 return false; 289 290 return true; 291 } 292 293 static bool 294 auvitek_i2c_wait_wrdone(struct auvitek_softc *sc) 295 { 296 uint8_t status; 297 int retry = 1000; 298 299 while (--retry > 0) { 300 status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS); 301 if (status & AU0828_I2C_STATUS_WR_DONE) 302 break; 303 delay(10); 304 } 305 if (retry == 0) 306 return false; 307 308 return true; 309 } 310