ki2c.c revision 1.8.22.1
1 /* $NetBSD: ki2c.c,v 1.8.22.1 2007/09/27 07:13:54 macallan 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 CFATTACH_DECL(ki2c, sizeof(struct ki2c_softc), 62 ki2c_match, ki2c_attach, NULL, NULL); 63 64 int 65 ki2c_match(parent, match, aux) 66 struct device *parent; 67 struct cfdata *match; 68 void *aux; 69 { 70 struct confargs *ca = aux; 71 72 if (strcmp(ca->ca_name, "i2c") == 0) 73 return 1; 74 75 return 0; 76 } 77 78 void 79 ki2c_attach(parent, self, aux) 80 struct device *parent; 81 struct device *self; 82 void *aux; 83 { 84 struct ki2c_softc *sc = (struct ki2c_softc *)self; 85 struct confargs *ca = aux; 86 int node = ca->ca_node; 87 int rate, child, namelen, i2cbus; 88 struct ki2c_confargs ka; 89 struct i2cbus_attach_args iba; 90 91 char name[32]; 92 u_int reg[20]; 93 94 ca->ca_reg[0] += ca->ca_baseaddr; 95 96 if (OF_getprop(node, "AAPL,i2c-rate", &rate, 4) != 4) { 97 printf(": cannot get i2c-rate\n"); 98 return; 99 } 100 if (OF_getprop(node, "AAPL,address", &sc->sc_reg, 4) != 4) { 101 printf(": unable to find i2c address\n"); 102 return; 103 } 104 if (OF_getprop(node, "AAPL,address-step", &sc->sc_regstep, 4) != 4) { 105 printf(": unable to find i2c address step\n"); 106 return; 107 } 108 109 printf("\n"); 110 111 ki2c_writereg(sc, STATUS, 0); 112 ki2c_writereg(sc, ISR, 0); 113 ki2c_writereg(sc, IER, 0); 114 115 ki2c_setmode(sc, I2C_STDSUBMODE); 116 ki2c_setspeed(sc, I2C_100kHz); /* XXX rate */ 117 118 lockinit(&sc->sc_buslock, PRIBIO|PCATCH, sc->sc_dev.dv_xname, 0, 0); 119 ki2c_writereg(sc, IER,I2C_INT_DATA|I2C_INT_ADDR|I2C_INT_STOP); 120 121 /* fill in the i2c tag */ 122 sc->sc_i2c.ic_cookie = sc; 123 sc->sc_i2c.ic_acquire_bus = ki2c_i2c_acquire_bus; 124 sc->sc_i2c.ic_release_bus = ki2c_i2c_release_bus; 125 sc->sc_i2c.ic_send_start = NULL; 126 sc->sc_i2c.ic_send_stop = NULL; 127 sc->sc_i2c.ic_initiate_xfer = NULL; 128 sc->sc_i2c.ic_read_byte = NULL; 129 sc->sc_i2c.ic_write_byte = NULL; 130 sc->sc_i2c.ic_exec = ki2c_i2c_exec; 131 132 iba.iba_tag = &sc->sc_i2c; 133 (void) config_found_ia(&sc->sc_dev, "i2cbus", &iba, iicbus_print); 134 135 /* 136 * newer OF puts I2C devices under 'i2c-bus' instead of attaching them 137 * directly to the ki2c node so we just check if we have a child named 138 * 'i2c-bus' and if so we attach its children, not ours 139 */ 140 i2cbus = 0; 141 child = OF_child(node); 142 while ((child != 0) && (i2cbus == 0)) { 143 OF_getprop(child, "name", name, sizeof(name)); 144 if (strcmp(name, "i2c-bus") == 0) 145 i2cbus = child; 146 child = OF_peer(child); 147 } 148 if (i2cbus == 0) 149 i2cbus = node; 150 151 for (child = OF_child(i2cbus); child; child = OF_peer(child)) { 152 int ok = 0; 153 namelen = OF_getprop(child, "name", name, sizeof(name)); 154 if (namelen < 0) 155 continue; 156 if (namelen >= sizeof(name)) 157 continue; 158 159 name[namelen] = 0; 160 ka.ka_name = name; 161 ka.ka_node = child; 162 ok = OF_getprop(child, "reg", reg, sizeof(reg)); 163 if (ok <= 0) { 164 ok = OF_getprop(child, "i2c-address", reg, 165 sizeof(reg)); 166 } 167 if (ok > 0) { 168 ka.ka_addr = reg[0]; 169 ka.ka_tag = &sc->sc_i2c; 170 config_found_ia(self, "ki2c", &ka, ki2c_print); 171 } 172 #ifdef DIAGNOSTIC 173 else { 174 printf("%s: device (%s) has no reg or i2c-address property.\n", 175 sc->sc_dev.dv_xname, name); 176 } 177 #endif 178 } 179 } 180 181 int 182 ki2c_print(aux, ki2c) 183 void *aux; 184 const char *ki2c; 185 { 186 struct ki2c_confargs *ka = aux; 187 188 if (ki2c) { 189 aprint_normal("%s at %s", ka->ka_name, ki2c); 190 aprint_normal(" address 0x%x", ka->ka_addr); 191 } 192 return UNCONF; 193 } 194 195 u_int 196 ki2c_readreg(sc, reg) 197 struct ki2c_softc *sc; 198 int reg; 199 { 200 u_char *addr = sc->sc_reg + sc->sc_regstep * reg; 201 202 return *addr; 203 } 204 205 void 206 ki2c_writereg(sc, reg, val) 207 struct ki2c_softc *sc; 208 int reg; 209 u_int val; 210 { 211 u_char *addr = sc->sc_reg + sc->sc_regstep * reg; 212 213 *addr = val; 214 __asm volatile ("eieio"); 215 delay(10); 216 } 217 218 u_int 219 ki2c_getmode(sc) 220 struct ki2c_softc *sc; 221 { 222 return ki2c_readreg(sc, MODE) & I2C_MODE; 223 } 224 225 void 226 ki2c_setmode(sc, mode) 227 struct ki2c_softc *sc; 228 u_int mode; 229 { 230 u_int x; 231 232 KASSERT((mode & ~I2C_MODE) == 0); 233 x = ki2c_readreg(sc, MODE); 234 x &= ~I2C_MODE; 235 x |= mode; 236 ki2c_writereg(sc, MODE, x); 237 } 238 239 u_int 240 ki2c_getspeed(sc) 241 struct ki2c_softc *sc; 242 { 243 return ki2c_readreg(sc, MODE) & I2C_SPEED; 244 } 245 246 void 247 ki2c_setspeed(sc, speed) 248 struct ki2c_softc *sc; 249 u_int speed; 250 { 251 u_int x; 252 253 KASSERT((speed & ~I2C_SPEED) == 0); 254 x = ki2c_readreg(sc, MODE); 255 x &= ~I2C_SPEED; 256 x |= speed; 257 ki2c_writereg(sc, MODE, x); 258 } 259 260 int 261 ki2c_intr(sc) 262 struct ki2c_softc *sc; 263 { 264 u_int isr, x; 265 266 isr = ki2c_readreg(sc, ISR); 267 if (isr & I2C_INT_ADDR) { 268 #if 0 269 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 270 /* No slave responded. */ 271 sc->sc_flags |= I2C_ERROR; 272 goto out; 273 } 274 #endif 275 276 if (sc->sc_flags & I2C_READING) { 277 if (sc->sc_resid > 1) { 278 x = ki2c_readreg(sc, CONTROL); 279 x |= I2C_CT_AAK; 280 ki2c_writereg(sc, CONTROL, x); 281 } 282 } else { 283 ki2c_writereg(sc, DATA, *sc->sc_data++); 284 sc->sc_resid--; 285 } 286 } 287 288 if (isr & I2C_INT_DATA) { 289 if (sc->sc_flags & I2C_READING) { 290 *sc->sc_data++ = ki2c_readreg(sc, DATA); 291 sc->sc_resid--; 292 293 if (sc->sc_resid == 0) { /* Completed */ 294 ki2c_writereg(sc, CONTROL, 0); 295 goto out; 296 } 297 } else { 298 #if 0 299 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 300 /* No slave responded. */ 301 sc->sc_flags |= I2C_ERROR; 302 goto out; 303 } 304 #endif 305 306 if (sc->sc_resid == 0) { 307 x = ki2c_readreg(sc, CONTROL) | I2C_CT_STOP; 308 ki2c_writereg(sc, CONTROL, x); 309 } else { 310 ki2c_writereg(sc, DATA, *sc->sc_data++); 311 sc->sc_resid--; 312 } 313 } 314 } 315 316 out: 317 if (isr & I2C_INT_STOP) { 318 ki2c_writereg(sc, CONTROL, 0); 319 sc->sc_flags &= ~I2C_BUSY; 320 } 321 322 ki2c_writereg(sc, ISR, isr); 323 324 return 1; 325 } 326 327 int 328 ki2c_poll(sc, timo) 329 struct ki2c_softc *sc; 330 int timo; 331 { 332 while (sc->sc_flags & I2C_BUSY) { 333 if (ki2c_readreg(sc, ISR)) 334 ki2c_intr(sc); 335 timo -= 100; 336 if (timo < 0) { 337 printf("i2c_poll: timeout\n"); 338 return -1; 339 } 340 delay(100); 341 } 342 return 0; 343 } 344 345 int 346 ki2c_start(sc, addr, subaddr, data, len) 347 struct ki2c_softc *sc; 348 int addr, subaddr, len; 349 void *data; 350 { 351 int rw = (sc->sc_flags & I2C_READING) ? 1 : 0; 352 int timo, x; 353 354 KASSERT((addr & 1) == 0); 355 356 sc->sc_data = data; 357 sc->sc_resid = len; 358 sc->sc_flags |= I2C_BUSY; 359 360 timo = 1000 + len * 200; 361 362 /* XXX TAS3001 sometimes takes 50ms to finish writing registers. */ 363 /* if (addr == 0x68) */ 364 timo += 100000; 365 366 ki2c_writereg(sc, ADDR, addr | rw); 367 ki2c_writereg(sc, SUBADDR, subaddr); 368 369 x = ki2c_readreg(sc, CONTROL) | I2C_CT_ADDR; 370 ki2c_writereg(sc, CONTROL, x); 371 372 if (ki2c_poll(sc, timo)) 373 return -1; 374 if (sc->sc_flags & I2C_ERROR) { 375 printf("I2C_ERROR\n"); 376 return -1; 377 } 378 return 0; 379 } 380 381 int 382 ki2c_read(sc, addr, subaddr, data, len) 383 struct ki2c_softc *sc; 384 int addr, subaddr, len; 385 void *data; 386 { 387 sc->sc_flags = I2C_READING; 388 #ifdef KI2C_DEBUG 389 printf("ki2c_read: %02x %d\n", addr, len); 390 #endif 391 return ki2c_start(sc, addr, subaddr, data, len); 392 } 393 394 int 395 ki2c_write(sc, addr, subaddr, data, len) 396 struct ki2c_softc *sc; 397 int addr, subaddr, len; 398 void *data; 399 { 400 sc->sc_flags = 0; 401 #ifdef KI2C_DEBUG 402 printf("ki2c_write: %02x %d\n",addr,len); 403 #endif 404 return ki2c_start(sc, addr, subaddr, data, len); 405 } 406 407 static int 408 ki2c_i2c_acquire_bus(void *cookie, int flags) 409 { 410 struct ki2c_softc *sc = cookie; 411 412 return (lockmgr(&sc->sc_buslock, LK_EXCLUSIVE, NULL)); 413 } 414 415 static void 416 ki2c_i2c_release_bus(void *cookie, int flags) 417 { 418 struct ki2c_softc *sc = cookie; 419 420 (void) lockmgr(&sc->sc_buslock, LK_RELEASE, NULL); 421 } 422 423 int 424 ki2c_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *vcmd, 425 size_t cmdlen, void *vbuf, size_t buflen, int flags) 426 { 427 struct ki2c_softc *sc = cookie; 428 429 /* we handle the subaddress stuff ourselves */ 430 ki2c_setmode(sc, I2C_STDMODE); 431 432 if (ki2c_write(sc, addr, 0, __UNCONST(vcmd), cmdlen) !=0 ) 433 return -1; 434 435 if (I2C_OP_READ_P(op)) { 436 if (ki2c_read(sc, addr, 0, vbuf, buflen) !=0 ) 437 return -1; 438 } 439 return 0; 440 } 441
Indexes created Mon Oct 20 11:09:49 GMT 2025