ki2c.c revision 1.17
1 /* $NetBSD: ki2c.c,v 1.17 2011/06/18 08:08:28 matt 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 <machine/autoconf.h> 37 38 #include <macppc/dev/ki2cvar.h> 39 40 int ki2c_match(device_t, cfdata_t, void *); 41 void ki2c_attach(device_t, device_t, 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(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(device_t parent, cfdata_t match, void *aux) 67 { 68 struct confargs *ca = aux; 69 70 if (strcmp(ca->ca_name, "i2c") == 0) 71 return 1; 72 73 return 0; 74 } 75 76 void 77 ki2c_attach(device_t parent, device_t self, void *aux) 78 { 79 struct ki2c_softc *sc = device_private(self); 80 struct confargs *ca = aux; 81 int node = ca->ca_node; 82 int rate, child, namelen, i2cbus; 83 struct ki2c_confargs ka; 84 struct i2cbus_attach_args iba; 85 86 char name[32]; 87 u_int reg[20]; 88 89 ca->ca_reg[0] += ca->ca_baseaddr; 90 91 if (OF_getprop(node, "AAPL,i2c-rate", &rate, 4) != 4) { 92 printf(": cannot get i2c-rate\n"); 93 return; 94 } 95 if (OF_getprop(node, "AAPL,address", &sc->sc_reg, 4) != 4) { 96 printf(": unable to find i2c address\n"); 97 return; 98 } 99 if (OF_getprop(node, "AAPL,address-step", &sc->sc_regstep, 4) != 4) { 100 printf(": unable to find i2c address step\n"); 101 return; 102 } 103 104 printf("\n"); 105 106 ki2c_writereg(sc, STATUS, 0); 107 ki2c_writereg(sc, ISR, 0); 108 ki2c_writereg(sc, IER, 0); 109 110 ki2c_setmode(sc, I2C_STDSUBMODE); 111 ki2c_setspeed(sc, I2C_100kHz); /* XXX rate */ 112 113 mutex_init(&sc->sc_buslock, MUTEX_DEFAULT, IPL_NONE); 114 ki2c_writereg(sc, IER,I2C_INT_DATA|I2C_INT_ADDR|I2C_INT_STOP); 115 116 /* fill in the i2c tag */ 117 sc->sc_i2c.ic_cookie = sc; 118 sc->sc_i2c.ic_acquire_bus = ki2c_i2c_acquire_bus; 119 sc->sc_i2c.ic_release_bus = ki2c_i2c_release_bus; 120 sc->sc_i2c.ic_send_start = NULL; 121 sc->sc_i2c.ic_send_stop = NULL; 122 sc->sc_i2c.ic_initiate_xfer = NULL; 123 sc->sc_i2c.ic_read_byte = NULL; 124 sc->sc_i2c.ic_write_byte = NULL; 125 sc->sc_i2c.ic_exec = ki2c_i2c_exec; 126 127 iba.iba_tag = &sc->sc_i2c; 128 (void) config_found_ia(&sc->sc_dev, "i2cbus", &iba, iicbus_print); 129 130 /* 131 * newer OF puts I2C devices under 'i2c-bus' instead of attaching them 132 * directly to the ki2c node so we just check if we have a child named 133 * 'i2c-bus' and if so we attach its children, not ours 134 */ 135 i2cbus = 0; 136 child = OF_child(node); 137 while ((child != 0) && (i2cbus == 0)) { 138 OF_getprop(child, "name", name, sizeof(name)); 139 if (strcmp(name, "i2c-bus") == 0) 140 i2cbus = child; 141 child = OF_peer(child); 142 } 143 if (i2cbus == 0) 144 i2cbus = node; 145 146 for (child = OF_child(i2cbus); child; child = OF_peer(child)) { 147 int ok = 0; 148 namelen = OF_getprop(child, "name", name, sizeof(name)); 149 if (namelen < 0) 150 continue; 151 if (namelen >= sizeof(name)) 152 continue; 153 154 name[namelen] = 0; 155 ka.ka_name = name; 156 ka.ka_node = child; 157 ok = OF_getprop(child, "reg", reg, sizeof(reg)); 158 if (ok <= 0) { 159 ok = OF_getprop(child, "i2c-address", reg, 160 sizeof(reg)); 161 } 162 if (ok > 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 #ifdef DIAGNOSTIC 168 else { 169 printf("%s: device (%s) has no reg or i2c-address property.\n", 170 sc->sc_dev.dv_xname, name); 171 } 172 #endif 173 } 174 } 175 176 int 177 ki2c_print(void *aux, const char *ki2c) 178 { 179 struct ki2c_confargs *ka = aux; 180 181 if (ki2c) { 182 aprint_normal("%s at %s", ka->ka_name, ki2c); 183 aprint_normal(" address 0x%x", ka->ka_addr); 184 } 185 return UNCONF; 186 } 187 188 u_int 189 ki2c_readreg(struct ki2c_softc *sc, int reg) 190 { 191 u_char *addr = sc->sc_reg + sc->sc_regstep * reg; 192 193 return *addr; 194 } 195 196 void 197 ki2c_writereg(struct ki2c_softc *sc, int reg, u_int val) 198 { 199 u_char *addr = sc->sc_reg + sc->sc_regstep * reg; 200 201 *addr = val; 202 __asm volatile ("eieio"); 203 delay(10); 204 } 205 206 u_int 207 ki2c_getmode(struct ki2c_softc *sc) 208 { 209 return ki2c_readreg(sc, MODE) & I2C_MODE; 210 } 211 212 void 213 ki2c_setmode(struct ki2c_softc *sc, u_int mode) 214 { 215 u_int x; 216 217 KASSERT((mode & ~I2C_MODE) == 0); 218 x = ki2c_readreg(sc, MODE); 219 x &= ~I2C_MODE; 220 x |= mode; 221 ki2c_writereg(sc, MODE, x); 222 } 223 224 u_int 225 ki2c_getspeed(struct ki2c_softc *sc) 226 { 227 return ki2c_readreg(sc, MODE) & I2C_SPEED; 228 } 229 230 void 231 ki2c_setspeed(struct ki2c_softc *sc, u_int speed) 232 { 233 u_int x; 234 235 KASSERT((speed & ~I2C_SPEED) == 0); 236 x = ki2c_readreg(sc, MODE); 237 x &= ~I2C_SPEED; 238 x |= speed; 239 ki2c_writereg(sc, MODE, x); 240 } 241 242 int 243 ki2c_intr(struct ki2c_softc *sc) 244 { 245 u_int isr, x; 246 247 isr = ki2c_readreg(sc, ISR); 248 if (isr & I2C_INT_ADDR) { 249 #if 0 250 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 251 /* No slave responded. */ 252 sc->sc_flags |= I2C_ERROR; 253 goto out; 254 } 255 #endif 256 257 if (sc->sc_flags & I2C_READING) { 258 if (sc->sc_resid > 1) { 259 x = ki2c_readreg(sc, CONTROL); 260 x |= I2C_CT_AAK; 261 ki2c_writereg(sc, CONTROL, x); 262 } 263 } else { 264 ki2c_writereg(sc, DATA, *sc->sc_data++); 265 sc->sc_resid--; 266 } 267 } 268 269 if (isr & I2C_INT_DATA) { 270 if (sc->sc_flags & I2C_READING) { 271 *sc->sc_data++ = ki2c_readreg(sc, DATA); 272 sc->sc_resid--; 273 274 if (sc->sc_resid == 0) { /* Completed */ 275 ki2c_writereg(sc, CONTROL, 0); 276 goto out; 277 } 278 } else { 279 #if 0 280 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 281 /* No slave responded. */ 282 sc->sc_flags |= I2C_ERROR; 283 goto out; 284 } 285 #endif 286 287 if (sc->sc_resid == 0) { 288 x = ki2c_readreg(sc, CONTROL) | I2C_CT_STOP; 289 ki2c_writereg(sc, CONTROL, x); 290 } else { 291 ki2c_writereg(sc, DATA, *sc->sc_data++); 292 sc->sc_resid--; 293 } 294 } 295 } 296 297 out: 298 if (isr & I2C_INT_STOP) { 299 ki2c_writereg(sc, CONTROL, 0); 300 sc->sc_flags &= ~I2C_BUSY; 301 } 302 303 ki2c_writereg(sc, ISR, isr); 304 305 return 1; 306 } 307 308 int 309 ki2c_poll(struct ki2c_softc *sc, int timo) 310 { 311 while (sc->sc_flags & I2C_BUSY) { 312 if (ki2c_readreg(sc, ISR)) 313 ki2c_intr(sc); 314 timo -= 100; 315 if (timo < 0) { 316 printf("i2c_poll: timeout\n"); 317 return -1; 318 } 319 delay(100); 320 } 321 return 0; 322 } 323 324 int 325 ki2c_start(struct ki2c_softc *sc, int addr, int subaddr, void *data, int len) 326 { 327 int rw = (sc->sc_flags & I2C_READING) ? 1 : 0; 328 int timo, x; 329 330 KASSERT((addr & 1) == 0); 331 332 sc->sc_data = data; 333 sc->sc_resid = len; 334 sc->sc_flags |= I2C_BUSY; 335 336 timo = 1000 + len * 200; 337 338 /* XXX TAS3001 sometimes takes 50ms to finish writing registers. */ 339 /* if (addr == 0x68) */ 340 timo += 100000; 341 342 ki2c_writereg(sc, ADDR, addr | rw); 343 ki2c_writereg(sc, SUBADDR, subaddr); 344 345 x = ki2c_readreg(sc, CONTROL) | I2C_CT_ADDR; 346 ki2c_writereg(sc, CONTROL, x); 347 348 if (ki2c_poll(sc, timo)) 349 return -1; 350 if (sc->sc_flags & I2C_ERROR) { 351 printf("I2C_ERROR\n"); 352 return -1; 353 } 354 return 0; 355 } 356 357 int 358 ki2c_read(struct ki2c_softc *sc, int addr, int subaddr, void *data, int len) 359 { 360 sc->sc_flags = I2C_READING; 361 #ifdef KI2C_DEBUG 362 printf("ki2c_read: %02x %d\n", addr, len); 363 #endif 364 return ki2c_start(sc, addr, subaddr, data, len); 365 } 366 367 int 368 ki2c_write(struct ki2c_softc *sc, int addr, int subaddr, void *data, int len) 369 { 370 sc->sc_flags = 0; 371 #ifdef KI2C_DEBUG 372 printf("ki2c_write: %02x %d\n",addr,len); 373 #endif 374 return ki2c_start(sc, addr, subaddr, data, len); 375 } 376 377 static int 378 ki2c_i2c_acquire_bus(void *cookie, int flags) 379 { 380 struct ki2c_softc *sc = cookie; 381 382 mutex_enter(&sc->sc_buslock); 383 return 0; 384 } 385 386 static void 387 ki2c_i2c_release_bus(void *cookie, int flags) 388 { 389 struct ki2c_softc *sc = cookie; 390 391 mutex_exit(&sc->sc_buslock); 392 } 393 394 int 395 ki2c_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *vcmd, 396 size_t cmdlen, void *vbuf, size_t buflen, int flags) 397 { 398 struct ki2c_softc *sc = cookie; 399 int i; 400 size_t w_len; 401 uint8_t *wp; 402 uint8_t wrbuf[I2C_EXEC_MAX_CMDLEN + I2C_EXEC_MAX_CMDLEN]; 403 404 /* 405 * We don't have any idea if the ki2c controller can execute 406 * i2c quick_{read,write} operations, so if someone tries one, 407 * return an error. 408 */ 409 if (cmdlen == 0 && buflen == 0) 410 return -1; 411 412 /* we handle the subaddress stuff ourselves */ 413 ki2c_setmode(sc, I2C_STDMODE); 414 415 /* Write-buffer defaults to vcmd */ 416 wp = (uint8_t *)(__UNCONST(vcmd)); 417 w_len = cmdlen; 418 419 /* 420 * Concatenate vcmd and vbuf for write operations 421 * 422 * Drivers written specifically for ki2c might already do this, 423 * but "generic" i2c drivers still provide separate arguments 424 * for the cmd and buf parts of iic_smbus_write_{byte,word}. 425 */ 426 if (I2C_OP_WRITE_P(op) && buflen != 0) { 427 if (cmdlen == 0) { 428 wp = (uint8_t *)vbuf; 429 w_len = buflen; 430 } else { 431 KASSERT((cmdlen + buflen) <= sizeof(wrbuf)); 432 wp = (uint8_t *)(__UNCONST(vcmd)); 433 w_len = 0; 434 for (i = 0; i < cmdlen; i++) 435 wrbuf[w_len++] = *wp++; 436 wp = (uint8_t *)vbuf; 437 for (i = 0; i < buflen; i++) 438 wrbuf[w_len++] = *wp++; 439 wp = wrbuf; 440 } 441 } 442 443 if (ki2c_write(sc, addr, 0, wp, w_len) !=0 ) 444 return -1; 445 446 if (I2C_OP_READ_P(op)) { 447 if (ki2c_read(sc, addr, 0, vbuf, buflen) !=0 ) 448 return -1; 449 } 450 return 0; 451 } 452
Indexes created Thu Sep 25 16:09:42 GMT 2025