ki2c.c revision 1.13
1 /* $NetBSD: ki2c.c,v 1.13 2009/03/14 14:46:01 dsl 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 #include <sys/mutex.h> 34 35 #include <dev/ofw/openfirm.h> 36 #include <uvm/uvm_extern.h> 37 #include <machine/autoconf.h> 38 39 #include <macppc/dev/ki2cvar.h> 40 41 int ki2c_match(struct device *, struct cfdata *, void *); 42 void ki2c_attach(struct device *, struct device *, void *); 43 inline u_int ki2c_readreg(struct ki2c_softc *, int); 44 inline void ki2c_writereg(struct ki2c_softc *, int, u_int); 45 u_int ki2c_getmode(struct ki2c_softc *); 46 void ki2c_setmode(struct ki2c_softc *, u_int); 47 u_int ki2c_getspeed(struct ki2c_softc *); 48 void ki2c_setspeed(struct ki2c_softc *, u_int); 49 int ki2c_intr(struct ki2c_softc *); 50 int ki2c_poll(struct ki2c_softc *, int); 51 int ki2c_start(struct ki2c_softc *, int, int, void *, int); 52 int ki2c_read(struct ki2c_softc *, int, int, void *, int); 53 int ki2c_write(struct ki2c_softc *, int, int, void *, int); 54 int ki2c_print(void *, const char *); 55 56 /* I2C glue */ 57 static int ki2c_i2c_acquire_bus(void *, int); 58 static void ki2c_i2c_release_bus(void *, int); 59 static int ki2c_i2c_exec(void *, i2c_op_t, i2c_addr_t, const void *, size_t, 60 void *, size_t, int); 61 62 63 CFATTACH_DECL(ki2c, sizeof(struct ki2c_softc), ki2c_match, ki2c_attach, 64 NULL, NULL); 65 66 int 67 ki2c_match(parent, match, aux) 68 struct device *parent; 69 struct cfdata *match; 70 void *aux; 71 { 72 struct confargs *ca = aux; 73 74 if (strcmp(ca->ca_name, "i2c") == 0) 75 return 1; 76 77 return 0; 78 } 79 80 void 81 ki2c_attach(parent, self, aux) 82 struct device *parent; 83 struct device *self; 84 void *aux; 85 { 86 struct ki2c_softc *sc = (struct ki2c_softc *)self; 87 struct confargs *ca = aux; 88 int node = ca->ca_node; 89 int rate, child, namelen, i2cbus; 90 struct ki2c_confargs ka; 91 struct i2cbus_attach_args iba; 92 93 char name[32]; 94 u_int reg[20]; 95 96 ca->ca_reg[0] += ca->ca_baseaddr; 97 98 if (OF_getprop(node, "AAPL,i2c-rate", &rate, 4) != 4) { 99 printf(": cannot get i2c-rate\n"); 100 return; 101 } 102 if (OF_getprop(node, "AAPL,address", &sc->sc_reg, 4) != 4) { 103 printf(": unable to find i2c address\n"); 104 return; 105 } 106 if (OF_getprop(node, "AAPL,address-step", &sc->sc_regstep, 4) != 4) { 107 printf(": unable to find i2c address step\n"); 108 return; 109 } 110 111 printf("\n"); 112 113 ki2c_writereg(sc, STATUS, 0); 114 ki2c_writereg(sc, ISR, 0); 115 ki2c_writereg(sc, IER, 0); 116 117 ki2c_setmode(sc, I2C_STDSUBMODE); 118 ki2c_setspeed(sc, I2C_100kHz); /* XXX rate */ 119 120 mutex_init(&sc->sc_buslock, MUTEX_DEFAULT, IPL_NONE); 121 ki2c_writereg(sc, IER,I2C_INT_DATA|I2C_INT_ADDR|I2C_INT_STOP); 122 123 /* fill in the i2c tag */ 124 sc->sc_i2c.ic_cookie = sc; 125 sc->sc_i2c.ic_acquire_bus = ki2c_i2c_acquire_bus; 126 sc->sc_i2c.ic_release_bus = ki2c_i2c_release_bus; 127 sc->sc_i2c.ic_send_start = NULL; 128 sc->sc_i2c.ic_send_stop = NULL; 129 sc->sc_i2c.ic_initiate_xfer = NULL; 130 sc->sc_i2c.ic_read_byte = NULL; 131 sc->sc_i2c.ic_write_byte = NULL; 132 sc->sc_i2c.ic_exec = ki2c_i2c_exec; 133 134 iba.iba_tag = &sc->sc_i2c; 135 (void) config_found_ia(&sc->sc_dev, "i2cbus", &iba, iicbus_print); 136 137 /* 138 * newer OF puts I2C devices under 'i2c-bus' instead of attaching them 139 * directly to the ki2c node so we just check if we have a child named 140 * 'i2c-bus' and if so we attach its children, not ours 141 */ 142 i2cbus = 0; 143 child = OF_child(node); 144 while ((child != 0) && (i2cbus == 0)) { 145 OF_getprop(child, "name", name, sizeof(name)); 146 if (strcmp(name, "i2c-bus") == 0) 147 i2cbus = child; 148 child = OF_peer(child); 149 } 150 if (i2cbus == 0) 151 i2cbus = node; 152 153 for (child = OF_child(i2cbus); child; child = OF_peer(child)) { 154 int ok = 0; 155 namelen = OF_getprop(child, "name", name, sizeof(name)); 156 if (namelen < 0) 157 continue; 158 if (namelen >= sizeof(name)) 159 continue; 160 161 name[namelen] = 0; 162 ka.ka_name = name; 163 ka.ka_node = child; 164 ok = OF_getprop(child, "reg", reg, sizeof(reg)); 165 if (ok <= 0) { 166 ok = OF_getprop(child, "i2c-address", reg, 167 sizeof(reg)); 168 } 169 if (ok > 0) { 170 ka.ka_addr = reg[0]; 171 ka.ka_tag = &sc->sc_i2c; 172 config_found_ia(self, "ki2c", &ka, ki2c_print); 173 } 174 #ifdef DIAGNOSTIC 175 else { 176 printf("%s: device (%s) has no reg or i2c-address property.\n", 177 sc->sc_dev.dv_xname, name); 178 } 179 #endif 180 } 181 } 182 183 int 184 ki2c_print(aux, ki2c) 185 void *aux; 186 const char *ki2c; 187 { 188 struct ki2c_confargs *ka = aux; 189 190 if (ki2c) { 191 aprint_normal("%s at %s", ka->ka_name, ki2c); 192 aprint_normal(" address 0x%x", ka->ka_addr); 193 } 194 return UNCONF; 195 } 196 197 u_int 198 ki2c_readreg(sc, reg) 199 struct ki2c_softc *sc; 200 int reg; 201 { 202 u_char *addr = sc->sc_reg + sc->sc_regstep * reg; 203 204 return *addr; 205 } 206 207 void 208 ki2c_writereg(sc, reg, val) 209 struct ki2c_softc *sc; 210 int reg; 211 u_int val; 212 { 213 u_char *addr = sc->sc_reg + sc->sc_regstep * reg; 214 215 *addr = val; 216 __asm volatile ("eieio"); 217 delay(10); 218 } 219 220 u_int 221 ki2c_getmode(sc) 222 struct ki2c_softc *sc; 223 { 224 return ki2c_readreg(sc, MODE) & I2C_MODE; 225 } 226 227 void 228 ki2c_setmode(sc, mode) 229 struct ki2c_softc *sc; 230 u_int mode; 231 { 232 u_int x; 233 234 KASSERT((mode & ~I2C_MODE) == 0); 235 x = ki2c_readreg(sc, MODE); 236 x &= ~I2C_MODE; 237 x |= mode; 238 ki2c_writereg(sc, MODE, x); 239 } 240 241 u_int 242 ki2c_getspeed(sc) 243 struct ki2c_softc *sc; 244 { 245 return ki2c_readreg(sc, MODE) & I2C_SPEED; 246 } 247 248 void 249 ki2c_setspeed(sc, speed) 250 struct ki2c_softc *sc; 251 u_int speed; 252 { 253 u_int x; 254 255 KASSERT((speed & ~I2C_SPEED) == 0); 256 x = ki2c_readreg(sc, MODE); 257 x &= ~I2C_SPEED; 258 x |= speed; 259 ki2c_writereg(sc, MODE, x); 260 } 261 262 int 263 ki2c_intr(sc) 264 struct ki2c_softc *sc; 265 { 266 u_int isr, x; 267 268 isr = ki2c_readreg(sc, ISR); 269 if (isr & I2C_INT_ADDR) { 270 #if 0 271 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 272 /* No slave responded. */ 273 sc->sc_flags |= I2C_ERROR; 274 goto out; 275 } 276 #endif 277 278 if (sc->sc_flags & I2C_READING) { 279 if (sc->sc_resid > 1) { 280 x = ki2c_readreg(sc, CONTROL); 281 x |= I2C_CT_AAK; 282 ki2c_writereg(sc, CONTROL, x); 283 } 284 } else { 285 ki2c_writereg(sc, DATA, *sc->sc_data++); 286 sc->sc_resid--; 287 } 288 } 289 290 if (isr & I2C_INT_DATA) { 291 if (sc->sc_flags & I2C_READING) { 292 *sc->sc_data++ = ki2c_readreg(sc, DATA); 293 sc->sc_resid--; 294 295 if (sc->sc_resid == 0) { /* Completed */ 296 ki2c_writereg(sc, CONTROL, 0); 297 goto out; 298 } 299 } else { 300 #if 0 301 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 302 /* No slave responded. */ 303 sc->sc_flags |= I2C_ERROR; 304 goto out; 305 } 306 #endif 307 308 if (sc->sc_resid == 0) { 309 x = ki2c_readreg(sc, CONTROL) | I2C_CT_STOP; 310 ki2c_writereg(sc, CONTROL, x); 311 } else { 312 ki2c_writereg(sc, DATA, *sc->sc_data++); 313 sc->sc_resid--; 314 } 315 } 316 } 317 318 out: 319 if (isr & I2C_INT_STOP) { 320 ki2c_writereg(sc, CONTROL, 0); 321 sc->sc_flags &= ~I2C_BUSY; 322 } 323 324 ki2c_writereg(sc, ISR, isr); 325 326 return 1; 327 } 328 329 int 330 ki2c_poll(sc, timo) 331 struct ki2c_softc *sc; 332 int timo; 333 { 334 while (sc->sc_flags & I2C_BUSY) { 335 if (ki2c_readreg(sc, ISR)) 336 ki2c_intr(sc); 337 timo -= 100; 338 if (timo < 0) { 339 printf("i2c_poll: timeout\n"); 340 return -1; 341 } 342 delay(100); 343 } 344 return 0; 345 } 346 347 int 348 ki2c_start(sc, addr, subaddr, data, len) 349 struct ki2c_softc *sc; 350 int addr, subaddr, len; 351 void *data; 352 { 353 int rw = (sc->sc_flags & I2C_READING) ? 1 : 0; 354 int timo, x; 355 356 KASSERT((addr & 1) == 0); 357 358 sc->sc_data = data; 359 sc->sc_resid = len; 360 sc->sc_flags |= I2C_BUSY; 361 362 timo = 1000 + len * 200; 363 364 /* XXX TAS3001 sometimes takes 50ms to finish writing registers. */ 365 /* if (addr == 0x68) */ 366 timo += 100000; 367 368 ki2c_writereg(sc, ADDR, addr | rw); 369 ki2c_writereg(sc, SUBADDR, subaddr); 370 371 x = ki2c_readreg(sc, CONTROL) | I2C_CT_ADDR; 372 ki2c_writereg(sc, CONTROL, x); 373 374 if (ki2c_poll(sc, timo)) 375 return -1; 376 if (sc->sc_flags & I2C_ERROR) { 377 printf("I2C_ERROR\n"); 378 return -1; 379 } 380 return 0; 381 } 382 383 int 384 ki2c_read(sc, addr, subaddr, data, len) 385 struct ki2c_softc *sc; 386 int addr, subaddr, len; 387 void *data; 388 { 389 sc->sc_flags = I2C_READING; 390 #ifdef KI2C_DEBUG 391 printf("ki2c_read: %02x %d\n", addr, len); 392 #endif 393 return ki2c_start(sc, addr, subaddr, data, len); 394 } 395 396 int 397 ki2c_write(sc, addr, subaddr, data, len) 398 struct ki2c_softc *sc; 399 int addr, subaddr, len; 400 void *data; 401 { 402 sc->sc_flags = 0; 403 #ifdef KI2C_DEBUG 404 printf("ki2c_write: %02x %d\n",addr,len); 405 #endif 406 return ki2c_start(sc, addr, subaddr, data, len); 407 } 408 409 static int 410 ki2c_i2c_acquire_bus(void *cookie, int flags) 411 { 412 struct ki2c_softc *sc = cookie; 413 414 mutex_enter(&sc->sc_buslock); 415 return 0; 416 } 417 418 static void 419 ki2c_i2c_release_bus(void *cookie, int flags) 420 { 421 struct ki2c_softc *sc = cookie; 422 423 mutex_exit(&sc->sc_buslock); 424 } 425 426 int 427 ki2c_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *vcmd, 428 size_t cmdlen, void *vbuf, size_t buflen, int flags) 429 { 430 struct ki2c_softc *sc = cookie; 431 int i; 432 size_t w_len; 433 uint8_t *wp; 434 uint8_t wrbuf[I2C_EXEC_MAX_CMDLEN + I2C_EXEC_MAX_CMDLEN]; 435 436 /* 437 * We don't have any idea if the ki2c controller can execute 438 * i2c quick_{read,write} operations, so if someone tries one, 439 * return an error. 440 */ 441 if (cmdlen == 0 && buflen == 0) 442 return -1; 443 444 /* we handle the subaddress stuff ourselves */ 445 ki2c_setmode(sc, I2C_STDMODE); 446 447 /* Write-buffer defaults to vcmd */ 448 wp = (uint8_t *)(__UNCONST(vcmd)); 449 w_len = cmdlen; 450 451 /* 452 * Concatenate vcmd and vbuf for write operations 453 * 454 * Drivers written specifically for ki2c might already do this, 455 * but "generic" i2c drivers still provide separate arguments 456 * for the cmd and buf parts of iic_smbus_write_{byte,word}. 457 */ 458 if (I2C_OP_WRITE_P(op) && buflen != 0) { 459 if (cmdlen == 0) { 460 wp = (uint8_t *)vbuf; 461 w_len = buflen; 462 } else { 463 KASSERT((cmdlen + buflen) <= sizeof(wrbuf)); 464 wp = (uint8_t *)(__UNCONST(vcmd)); 465 w_len = 0; 466 for (i = 0; i < cmdlen; i++) 467 wrbuf[w_len++] = *wp++; 468 wp = (uint8_t *)vbuf; 469 for (i = 0; i < buflen; i++) 470 wrbuf[w_len++] = *wp++; 471 wp = wrbuf; 472 } 473 } 474 475 if (ki2c_write(sc, addr, 0, wp, w_len) !=0 ) 476 return -1; 477 478 if (I2C_OP_READ_P(op)) { 479 if (ki2c_read(sc, addr, 0, vbuf, buflen) !=0 ) 480 return -1; 481 } 482 return 0; 483 } 484
Indexes created Wed Sep 24 05:09:52 GMT 2025