ki2c.c revision 1.9
1 /* $NetBSD: ki2c.c,v 1.9 2007/09/27 08:49:33 dogcow 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 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 if (OF_getprop(child, "reg", reg, sizeof(reg))>0) { 163 ka.ka_addr = reg[0]; 164 ka.ka_tag = &sc->sc_i2c; 165 config_found_ia(self, "ki2c", &ka, ki2c_print); 166 } 167 } 168 } 169 170 int 171 ki2c_print(aux, ki2c) 172 void *aux; 173 const char *ki2c; 174 { 175 struct ki2c_confargs *ka = aux; 176 177 if (ki2c) { 178 aprint_normal("%s at %s", ka->ka_name, ki2c); 179 aprint_normal(" address 0x%x", ka->ka_addr); 180 } 181 return UNCONF; 182 } 183 184 u_int 185 ki2c_readreg(sc, reg) 186 struct ki2c_softc *sc; 187 int reg; 188 { 189 u_char *addr = sc->sc_reg + sc->sc_regstep * reg; 190 191 return *addr; 192 } 193 194 void 195 ki2c_writereg(sc, reg, val) 196 struct ki2c_softc *sc; 197 int reg; 198 u_int val; 199 { 200 u_char *addr = sc->sc_reg + sc->sc_regstep * reg; 201 202 *addr = val; 203 __asm volatile ("eieio"); 204 delay(10); 205 } 206 207 u_int 208 ki2c_getmode(sc) 209 struct ki2c_softc *sc; 210 { 211 return ki2c_readreg(sc, MODE) & I2C_MODE; 212 } 213 214 void 215 ki2c_setmode(sc, mode) 216 struct ki2c_softc *sc; 217 u_int mode; 218 { 219 u_int x; 220 221 KASSERT((mode & ~I2C_MODE) == 0); 222 x = ki2c_readreg(sc, MODE); 223 x &= ~I2C_MODE; 224 x |= mode; 225 ki2c_writereg(sc, MODE, x); 226 } 227 228 u_int 229 ki2c_getspeed(sc) 230 struct ki2c_softc *sc; 231 { 232 return ki2c_readreg(sc, MODE) & I2C_SPEED; 233 } 234 235 void 236 ki2c_setspeed(sc, speed) 237 struct ki2c_softc *sc; 238 u_int speed; 239 { 240 u_int x; 241 242 KASSERT((speed & ~I2C_SPEED) == 0); 243 x = ki2c_readreg(sc, MODE); 244 x &= ~I2C_SPEED; 245 x |= speed; 246 ki2c_writereg(sc, MODE, x); 247 } 248 249 int 250 ki2c_intr(sc) 251 struct ki2c_softc *sc; 252 { 253 u_int isr, x; 254 255 isr = ki2c_readreg(sc, ISR); 256 if (isr & I2C_INT_ADDR) { 257 #if 0 258 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 259 /* No slave responded. */ 260 sc->sc_flags |= I2C_ERROR; 261 goto out; 262 } 263 #endif 264 265 if (sc->sc_flags & I2C_READING) { 266 if (sc->sc_resid > 1) { 267 x = ki2c_readreg(sc, CONTROL); 268 x |= I2C_CT_AAK; 269 ki2c_writereg(sc, CONTROL, x); 270 } 271 } else { 272 ki2c_writereg(sc, DATA, *sc->sc_data++); 273 sc->sc_resid--; 274 } 275 } 276 277 if (isr & I2C_INT_DATA) { 278 if (sc->sc_flags & I2C_READING) { 279 *sc->sc_data++ = ki2c_readreg(sc, DATA); 280 sc->sc_resid--; 281 282 if (sc->sc_resid == 0) { /* Completed */ 283 ki2c_writereg(sc, CONTROL, 0); 284 goto out; 285 } 286 } else { 287 #if 0 288 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 289 /* No slave responded. */ 290 sc->sc_flags |= I2C_ERROR; 291 goto out; 292 } 293 #endif 294 295 if (sc->sc_resid == 0) { 296 x = ki2c_readreg(sc, CONTROL) | I2C_CT_STOP; 297 ki2c_writereg(sc, CONTROL, x); 298 } else { 299 ki2c_writereg(sc, DATA, *sc->sc_data++); 300 sc->sc_resid--; 301 } 302 } 303 } 304 305 out: 306 if (isr & I2C_INT_STOP) { 307 ki2c_writereg(sc, CONTROL, 0); 308 sc->sc_flags &= ~I2C_BUSY; 309 } 310 311 ki2c_writereg(sc, ISR, isr); 312 313 return 1; 314 } 315 316 int 317 ki2c_poll(sc, timo) 318 struct ki2c_softc *sc; 319 int timo; 320 { 321 while (sc->sc_flags & I2C_BUSY) { 322 if (ki2c_readreg(sc, ISR)) 323 ki2c_intr(sc); 324 timo -= 100; 325 if (timo < 0) { 326 printf("i2c_poll: timeout\n"); 327 return -1; 328 } 329 delay(100); 330 } 331 return 0; 332 } 333 334 int 335 ki2c_start(sc, addr, subaddr, data, len) 336 struct ki2c_softc *sc; 337 int addr, subaddr, len; 338 void *data; 339 { 340 int rw = (sc->sc_flags & I2C_READING) ? 1 : 0; 341 int timo, x; 342 343 KASSERT((addr & 1) == 0); 344 345 sc->sc_data = data; 346 sc->sc_resid = len; 347 sc->sc_flags |= I2C_BUSY; 348 349 timo = 1000 + len * 200; 350 351 /* XXX TAS3001 sometimes takes 50ms to finish writing registers. */ 352 /* if (addr == 0x68) */ 353 timo += 100000; 354 355 ki2c_writereg(sc, ADDR, addr | rw); 356 ki2c_writereg(sc, SUBADDR, subaddr); 357 358 x = ki2c_readreg(sc, CONTROL) | I2C_CT_ADDR; 359 ki2c_writereg(sc, CONTROL, x); 360 361 if (ki2c_poll(sc, timo)) 362 return -1; 363 if (sc->sc_flags & I2C_ERROR) { 364 printf("I2C_ERROR\n"); 365 return -1; 366 } 367 return 0; 368 } 369 370 int 371 ki2c_read(sc, addr, subaddr, data, len) 372 struct ki2c_softc *sc; 373 int addr, subaddr, len; 374 void *data; 375 { 376 sc->sc_flags = I2C_READING; 377 #ifdef KI2C_DEBUG 378 printf("ki2c_read: %02x %d\n", addr, len); 379 #endif 380 return ki2c_start(sc, addr, subaddr, data, len); 381 } 382 383 int 384 ki2c_write(sc, addr, subaddr, data, len) 385 struct ki2c_softc *sc; 386 int addr, subaddr, len; 387 void *data; 388 { 389 sc->sc_flags = 0; 390 #ifdef KI2C_DEBUG 391 printf("ki2c_write: %02x %d\n",addr,len); 392 #endif 393 return ki2c_start(sc, addr, subaddr, data, len); 394 } 395 396 static int 397 ki2c_i2c_acquire_bus(void *cookie, int flags) 398 { 399 struct ki2c_softc *sc = cookie; 400 401 return (lockmgr(&sc->sc_buslock, LK_EXCLUSIVE, NULL)); 402 } 403 404 static void 405 ki2c_i2c_release_bus(void *cookie, int flags) 406 { 407 struct ki2c_softc *sc = cookie; 408 409 (void) lockmgr(&sc->sc_buslock, LK_RELEASE, NULL); 410 } 411 412 int 413 ki2c_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *vcmd, 414 size_t cmdlen, void *vbuf, size_t buflen, int flags) 415 { 416 struct ki2c_softc *sc = cookie; 417 418 /* we handle the subaddress stuff ourselves */ 419 ki2c_setmode(sc, I2C_STDMODE); 420 421 if (ki2c_write(sc, addr, 0, __UNCONST(vcmd), cmdlen) !=0 ) 422 return -1; 423 if (I2C_OP_READ_P(op)) 424 { 425 if (ki2c_read(sc, addr, 0, vbuf, buflen) !=0 ) 426 return -1; 427 } 428 return 0; 429 } 430
Indexes created Wed Sep 24 05:09:52 GMT 2025