ki2c.c revision 1.10
1 /* $NetBSD: ki2c.c,v 1.10 2007/10/17 19:55:18 garbled Exp $ */ 2 /* Id: ki2c.c,v 1.7 2002/10/05 09:56:05 tsubai Exp */ 3 4 /*- 5 * Copyright (c) 2001 Tsubai Masanari. 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 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/param.h> 31 #include <sys/device.h> 32 #include <sys/systm.h> 33 34 #include <dev/ofw/openfirm.h> 35 #include <uvm/uvm_extern.h> 36 #include <machine/autoconf.h> 37 38 #include <macppc/dev/ki2cvar.h> 39 40 int ki2c_match(struct device *, struct cfdata *, void *); 41 void ki2c_attach(struct device *, struct device *, void *); 42 inline u_int ki2c_readreg(struct ki2c_softc *, int); 43 inline void ki2c_writereg(struct ki2c_softc *, int, u_int); 44 u_int ki2c_getmode(struct ki2c_softc *); 45 void ki2c_setmode(struct ki2c_softc *, u_int); 46 u_int ki2c_getspeed(struct ki2c_softc *); 47 void ki2c_setspeed(struct ki2c_softc *, u_int); 48 int ki2c_intr(struct ki2c_softc *); 49 int ki2c_poll(struct ki2c_softc *, int); 50 int ki2c_start(struct ki2c_softc *, int, int, void *, int); 51 int ki2c_read(struct ki2c_softc *, int, int, void *, int); 52 int ki2c_write(struct ki2c_softc *, int, int, void *, int); 53 int ki2c_print __P((void *, const char *)); 54 55 /* I2C glue */ 56 static int ki2c_i2c_acquire_bus(void *, int); 57 static void ki2c_i2c_release_bus(void *, int); 58 static int ki2c_i2c_exec(void *, i2c_op_t, i2c_addr_t, const void *, size_t, 59 void *, size_t, int); 60 61 62 CFATTACH_DECL(ki2c, sizeof(struct ki2c_softc), ki2c_match, ki2c_attach, 63 NULL, NULL); 64 65 int 66 ki2c_match(parent, match, aux) 67 struct device *parent; 68 struct cfdata *match; 69 void *aux; 70 { 71 struct confargs *ca = aux; 72 73 if (strcmp(ca->ca_name, "i2c") == 0) 74 return 1; 75 76 return 0; 77 } 78 79 void 80 ki2c_attach(parent, self, aux) 81 struct device *parent; 82 struct device *self; 83 void *aux; 84 { 85 struct ki2c_softc *sc = (struct ki2c_softc *)self; 86 struct confargs *ca = aux; 87 int node = ca->ca_node; 88 int rate, child, namelen, i2cbus; 89 struct ki2c_confargs ka; 90 struct i2cbus_attach_args iba; 91 92 char name[32]; 93 u_int reg[20]; 94 95 ca->ca_reg[0] += ca->ca_baseaddr; 96 97 if (OF_getprop(node, "AAPL,i2c-rate", &rate, 4) != 4) { 98 printf(": cannot get i2c-rate\n"); 99 return; 100 } 101 if (OF_getprop(node, "AAPL,address", &sc->sc_reg, 4) != 4) { 102 printf(": unable to find i2c address\n"); 103 return; 104 } 105 if (OF_getprop(node, "AAPL,address-step", &sc->sc_regstep, 4) != 4) { 106 printf(": unable to find i2c address step\n"); 107 return; 108 } 109 110 printf("\n"); 111 112 ki2c_writereg(sc, STATUS, 0); 113 ki2c_writereg(sc, ISR, 0); 114 ki2c_writereg(sc, IER, 0); 115 116 ki2c_setmode(sc, I2C_STDSUBMODE); 117 ki2c_setspeed(sc, I2C_100kHz); /* XXX rate */ 118 119 lockinit(&sc->sc_buslock, PRIBIO|PCATCH, sc->sc_dev.dv_xname, 0, 0); 120 ki2c_writereg(sc, IER,I2C_INT_DATA|I2C_INT_ADDR|I2C_INT_STOP); 121 122 /* fill in the i2c tag */ 123 sc->sc_i2c.ic_cookie = sc; 124 sc->sc_i2c.ic_acquire_bus = ki2c_i2c_acquire_bus; 125 sc->sc_i2c.ic_release_bus = ki2c_i2c_release_bus; 126 sc->sc_i2c.ic_send_start = NULL; 127 sc->sc_i2c.ic_send_stop = NULL; 128 sc->sc_i2c.ic_initiate_xfer = NULL; 129 sc->sc_i2c.ic_read_byte = NULL; 130 sc->sc_i2c.ic_write_byte = NULL; 131 sc->sc_i2c.ic_exec = ki2c_i2c_exec; 132 133 iba.iba_tag = &sc->sc_i2c; 134 (void) config_found_ia(&sc->sc_dev, "i2cbus", &iba, iicbus_print); 135 136 /* 137 * newer OF puts I2C devices under 'i2c-bus' instead of attaching them 138 * directly to the ki2c node so we just check if we have a child named 139 * 'i2c-bus' and if so we attach its children, not ours 140 */ 141 i2cbus = 0; 142 child = OF_child(node); 143 while ((child != 0) && (i2cbus == 0)) { 144 OF_getprop(child, "name", name, sizeof(name)); 145 if (strcmp(name, "i2c-bus") == 0) 146 i2cbus = child; 147 child = OF_peer(child); 148 } 149 if (i2cbus == 0) 150 i2cbus = node; 151 152 for (child = OF_child(i2cbus); child; child = OF_peer(child)) { 153 int ok = 0; 154 namelen = OF_getprop(child, "name", name, sizeof(name)); 155 if (namelen < 0) 156 continue; 157 if (namelen >= sizeof(name)) 158 continue; 159 160 name[namelen] = 0; 161 ka.ka_name = name; 162 ka.ka_node = child; 163 ok = OF_getprop(child, "reg", reg, sizeof(reg)); 164 if (ok <= 0) { 165 ok = OF_getprop(child, "i2c-address", reg, 166 sizeof(reg)); 167 } 168 if (ok > 0) { 169 ka.ka_addr = reg[0]; 170 ka.ka_tag = &sc->sc_i2c; 171 config_found_ia(self, "ki2c", &ka, ki2c_print); 172 } 173 #ifdef DIAGNOSTIC 174 else { 175 printf("%s: device (%s) has no reg or i2c-address property.\n", 176 sc->sc_dev.dv_xname, name); 177 } 178 #endif 179 } 180 } 181 182 int 183 ki2c_print(aux, ki2c) 184 void *aux; 185 const char *ki2c; 186 { 187 struct ki2c_confargs *ka = aux; 188 189 if (ki2c) { 190 aprint_normal("%s at %s", ka->ka_name, ki2c); 191 aprint_normal(" address 0x%x", ka->ka_addr); 192 } 193 return UNCONF; 194 } 195 196 u_int 197 ki2c_readreg(sc, reg) 198 struct ki2c_softc *sc; 199 int reg; 200 { 201 u_char *addr = sc->sc_reg + sc->sc_regstep * reg; 202 203 return *addr; 204 } 205 206 void 207 ki2c_writereg(sc, reg, val) 208 struct ki2c_softc *sc; 209 int reg; 210 u_int val; 211 { 212 u_char *addr = sc->sc_reg + sc->sc_regstep * reg; 213 214 *addr = val; 215 __asm volatile ("eieio"); 216 delay(10); 217 } 218 219 u_int 220 ki2c_getmode(sc) 221 struct ki2c_softc *sc; 222 { 223 return ki2c_readreg(sc, MODE) & I2C_MODE; 224 } 225 226 void 227 ki2c_setmode(sc, mode) 228 struct ki2c_softc *sc; 229 u_int mode; 230 { 231 u_int x; 232 233 KASSERT((mode & ~I2C_MODE) == 0); 234 x = ki2c_readreg(sc, MODE); 235 x &= ~I2C_MODE; 236 x |= mode; 237 ki2c_writereg(sc, MODE, x); 238 } 239 240 u_int 241 ki2c_getspeed(sc) 242 struct ki2c_softc *sc; 243 { 244 return ki2c_readreg(sc, MODE) & I2C_SPEED; 245 } 246 247 void 248 ki2c_setspeed(sc, speed) 249 struct ki2c_softc *sc; 250 u_int speed; 251 { 252 u_int x; 253 254 KASSERT((speed & ~I2C_SPEED) == 0); 255 x = ki2c_readreg(sc, MODE); 256 x &= ~I2C_SPEED; 257 x |= speed; 258 ki2c_writereg(sc, MODE, x); 259 } 260 261 int 262 ki2c_intr(sc) 263 struct ki2c_softc *sc; 264 { 265 u_int isr, x; 266 267 isr = ki2c_readreg(sc, ISR); 268 if (isr & I2C_INT_ADDR) { 269 #if 0 270 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 271 /* No slave responded. */ 272 sc->sc_flags |= I2C_ERROR; 273 goto out; 274 } 275 #endif 276 277 if (sc->sc_flags & I2C_READING) { 278 if (sc->sc_resid > 1) { 279 x = ki2c_readreg(sc, CONTROL); 280 x |= I2C_CT_AAK; 281 ki2c_writereg(sc, CONTROL, x); 282 } 283 } else { 284 ki2c_writereg(sc, DATA, *sc->sc_data++); 285 sc->sc_resid--; 286 } 287 } 288 289 if (isr & I2C_INT_DATA) { 290 if (sc->sc_flags & I2C_READING) { 291 *sc->sc_data++ = ki2c_readreg(sc, DATA); 292 sc->sc_resid--; 293 294 if (sc->sc_resid == 0) { /* Completed */ 295 ki2c_writereg(sc, CONTROL, 0); 296 goto out; 297 } 298 } else { 299 #if 0 300 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 301 /* No slave responded. */ 302 sc->sc_flags |= I2C_ERROR; 303 goto out; 304 } 305 #endif 306 307 if (sc->sc_resid == 0) { 308 x = ki2c_readreg(sc, CONTROL) | I2C_CT_STOP; 309 ki2c_writereg(sc, CONTROL, x); 310 } else { 311 ki2c_writereg(sc, DATA, *sc->sc_data++); 312 sc->sc_resid--; 313 } 314 } 315 } 316 317 out: 318 if (isr & I2C_INT_STOP) { 319 ki2c_writereg(sc, CONTROL, 0); 320 sc->sc_flags &= ~I2C_BUSY; 321 } 322 323 ki2c_writereg(sc, ISR, isr); 324 325 return 1; 326 } 327 328 int 329 ki2c_poll(sc, timo) 330 struct ki2c_softc *sc; 331 int timo; 332 { 333 while (sc->sc_flags & I2C_BUSY) { 334 if (ki2c_readreg(sc, ISR)) 335 ki2c_intr(sc); 336 timo -= 100; 337 if (timo < 0) { 338 printf("i2c_poll: timeout\n"); 339 return -1; 340 } 341 delay(100); 342 } 343 return 0; 344 } 345 346 int 347 ki2c_start(sc, addr, subaddr, data, len) 348 struct ki2c_softc *sc; 349 int addr, subaddr, len; 350 void *data; 351 { 352 int rw = (sc->sc_flags & I2C_READING) ? 1 : 0; 353 int timo, x; 354 355 KASSERT((addr & 1) == 0); 356 357 sc->sc_data = data; 358 sc->sc_resid = len; 359 sc->sc_flags |= I2C_BUSY; 360 361 timo = 1000 + len * 200; 362 363 /* XXX TAS3001 sometimes takes 50ms to finish writing registers. */ 364 /* if (addr == 0x68) */ 365 timo += 100000; 366 367 ki2c_writereg(sc, ADDR, addr | rw); 368 ki2c_writereg(sc, SUBADDR, subaddr); 369 370 x = ki2c_readreg(sc, CONTROL) | I2C_CT_ADDR; 371 ki2c_writereg(sc, CONTROL, x); 372 373 if (ki2c_poll(sc, timo)) 374 return -1; 375 if (sc->sc_flags & I2C_ERROR) { 376 printf("I2C_ERROR\n"); 377 return -1; 378 } 379 return 0; 380 } 381 382 int 383 ki2c_read(sc, addr, subaddr, data, len) 384 struct ki2c_softc *sc; 385 int addr, subaddr, len; 386 void *data; 387 { 388 sc->sc_flags = I2C_READING; 389 #ifdef KI2C_DEBUG 390 printf("ki2c_read: %02x %d\n", addr, len); 391 #endif 392 return ki2c_start(sc, addr, subaddr, data, len); 393 } 394 395 int 396 ki2c_write(sc, addr, subaddr, data, len) 397 struct ki2c_softc *sc; 398 int addr, subaddr, len; 399 void *data; 400 { 401 sc->sc_flags = 0; 402 #ifdef KI2C_DEBUG 403 printf("ki2c_write: %02x %d\n",addr,len); 404 #endif 405 return ki2c_start(sc, addr, subaddr, data, len); 406 } 407 408 static int 409 ki2c_i2c_acquire_bus(void *cookie, int flags) 410 { 411 struct ki2c_softc *sc = cookie; 412 413 return (lockmgr(&sc->sc_buslock, LK_EXCLUSIVE, NULL)); 414 } 415 416 static void 417 ki2c_i2c_release_bus(void *cookie, int flags) 418 { 419 struct ki2c_softc *sc = cookie; 420 421 (void) lockmgr(&sc->sc_buslock, LK_RELEASE, NULL); 422 } 423 424 int 425 ki2c_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *vcmd, 426 size_t cmdlen, void *vbuf, size_t buflen, int flags) 427 { 428 struct ki2c_softc *sc = cookie; 429 430 /* we handle the subaddress stuff ourselves */ 431 ki2c_setmode(sc, I2C_STDMODE); 432 433 if (ki2c_write(sc, addr, 0, __UNCONST(vcmd), cmdlen) !=0 ) 434 return -1; 435 436 if (I2C_OP_READ_P(op)) { 437 if (ki2c_read(sc, addr, 0, vbuf, buflen) !=0 ) 438 return -1; 439 } 440 return 0; 441 } 442
Indexes created Thu Sep 25 02:09:54 GMT 2025