ki2c.c revision 1.15
1 /* $NetBSD: ki2c.c,v 1.15 2009/03/14 21:04:11 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(struct device *parent, struct cfdata *match, void *aux) 68 { 69 struct confargs *ca = aux; 70 71 if (strcmp(ca->ca_name, "i2c") == 0) 72 return 1; 73 74 return 0; 75 } 76 77 void 78 ki2c_attach(struct device *parent, struct device *self, void *aux) 79 { 80 struct ki2c_softc *sc = (struct ki2c_softc *)self; 81 struct confargs *ca = aux; 82 int node = ca->ca_node; 83 int rate, child, namelen, i2cbus; 84 struct ki2c_confargs ka; 85 struct i2cbus_attach_args iba; 86 87 char name[32]; 88 u_int reg[20]; 89 90 ca->ca_reg[0] += ca->ca_baseaddr; 91 92 if (OF_getprop(node, "AAPL,i2c-rate", &rate, 4) != 4) { 93 printf(": cannot get i2c-rate\n"); 94 return; 95 } 96 if (OF_getprop(node, "AAPL,address", &sc->sc_reg, 4) != 4) { 97 printf(": unable to find i2c address\n"); 98 return; 99 } 100 if (OF_getprop(node, "AAPL,address-step", &sc->sc_regstep, 4) != 4) { 101 printf(": unable to find i2c address step\n"); 102 return; 103 } 104 105 printf("\n"); 106 107 ki2c_writereg(sc, STATUS, 0); 108 ki2c_writereg(sc, ISR, 0); 109 ki2c_writereg(sc, IER, 0); 110 111 ki2c_setmode(sc, I2C_STDSUBMODE); 112 ki2c_setspeed(sc, I2C_100kHz); /* XXX rate */ 113 114 mutex_init(&sc->sc_buslock, MUTEX_DEFAULT, IPL_NONE); 115 ki2c_writereg(sc, IER,I2C_INT_DATA|I2C_INT_ADDR|I2C_INT_STOP); 116 117 /* fill in the i2c tag */ 118 sc->sc_i2c.ic_cookie = sc; 119 sc->sc_i2c.ic_acquire_bus = ki2c_i2c_acquire_bus; 120 sc->sc_i2c.ic_release_bus = ki2c_i2c_release_bus; 121 sc->sc_i2c.ic_send_start = NULL; 122 sc->sc_i2c.ic_send_stop = NULL; 123 sc->sc_i2c.ic_initiate_xfer = NULL; 124 sc->sc_i2c.ic_read_byte = NULL; 125 sc->sc_i2c.ic_write_byte = NULL; 126 sc->sc_i2c.ic_exec = ki2c_i2c_exec; 127 128 iba.iba_tag = &sc->sc_i2c; 129 (void) config_found_ia(&sc->sc_dev, "i2cbus", &iba, iicbus_print); 130 131 /* 132 * newer OF puts I2C devices under 'i2c-bus' instead of attaching them 133 * directly to the ki2c node so we just check if we have a child named 134 * 'i2c-bus' and if so we attach its children, not ours 135 */ 136 i2cbus = 0; 137 child = OF_child(node); 138 while ((child != 0) && (i2cbus == 0)) { 139 OF_getprop(child, "name", name, sizeof(name)); 140 if (strcmp(name, "i2c-bus") == 0) 141 i2cbus = child; 142 child = OF_peer(child); 143 } 144 if (i2cbus == 0) 145 i2cbus = node; 146 147 for (child = OF_child(i2cbus); child; child = OF_peer(child)) { 148 int ok = 0; 149 namelen = OF_getprop(child, "name", name, sizeof(name)); 150 if (namelen < 0) 151 continue; 152 if (namelen >= sizeof(name)) 153 continue; 154 155 name[namelen] = 0; 156 ka.ka_name = name; 157 ka.ka_node = child; 158 ok = OF_getprop(child, "reg", reg, sizeof(reg)); 159 if (ok <= 0) { 160 ok = OF_getprop(child, "i2c-address", reg, 161 sizeof(reg)); 162 } 163 if (ok > 0) { 164 ka.ka_addr = reg[0]; 165 ka.ka_tag = &sc->sc_i2c; 166 config_found_ia(self, "ki2c", &ka, ki2c_print); 167 } 168 #ifdef DIAGNOSTIC 169 else { 170 printf("%s: device (%s) has no reg or i2c-address property.\n", 171 sc->sc_dev.dv_xname, name); 172 } 173 #endif 174 } 175 } 176 177 int 178 ki2c_print(void *aux, const char *ki2c) 179 { 180 struct ki2c_confargs *ka = aux; 181 182 if (ki2c) { 183 aprint_normal("%s at %s", ka->ka_name, ki2c); 184 aprint_normal(" address 0x%x", ka->ka_addr); 185 } 186 return UNCONF; 187 } 188 189 u_int 190 ki2c_readreg(struct ki2c_softc *sc, int reg) 191 { 192 u_char *addr = sc->sc_reg + sc->sc_regstep * reg; 193 194 return *addr; 195 } 196 197 void 198 ki2c_writereg(struct ki2c_softc *sc, int reg, 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(struct ki2c_softc *sc) 209 { 210 return ki2c_readreg(sc, MODE) & I2C_MODE; 211 } 212 213 void 214 ki2c_setmode(struct ki2c_softc *sc, u_int mode) 215 { 216 u_int x; 217 218 KASSERT((mode & ~I2C_MODE) == 0); 219 x = ki2c_readreg(sc, MODE); 220 x &= ~I2C_MODE; 221 x |= mode; 222 ki2c_writereg(sc, MODE, x); 223 } 224 225 u_int 226 ki2c_getspeed(struct ki2c_softc *sc) 227 { 228 return ki2c_readreg(sc, MODE) & I2C_SPEED; 229 } 230 231 void 232 ki2c_setspeed(struct ki2c_softc *sc, u_int speed) 233 { 234 u_int x; 235 236 KASSERT((speed & ~I2C_SPEED) == 0); 237 x = ki2c_readreg(sc, MODE); 238 x &= ~I2C_SPEED; 239 x |= speed; 240 ki2c_writereg(sc, MODE, x); 241 } 242 243 int 244 ki2c_intr(struct ki2c_softc *sc) 245 { 246 u_int isr, x; 247 248 isr = ki2c_readreg(sc, ISR); 249 if (isr & I2C_INT_ADDR) { 250 #if 0 251 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 252 /* No slave responded. */ 253 sc->sc_flags |= I2C_ERROR; 254 goto out; 255 } 256 #endif 257 258 if (sc->sc_flags & I2C_READING) { 259 if (sc->sc_resid > 1) { 260 x = ki2c_readreg(sc, CONTROL); 261 x |= I2C_CT_AAK; 262 ki2c_writereg(sc, CONTROL, x); 263 } 264 } else { 265 ki2c_writereg(sc, DATA, *sc->sc_data++); 266 sc->sc_resid--; 267 } 268 } 269 270 if (isr & I2C_INT_DATA) { 271 if (sc->sc_flags & I2C_READING) { 272 *sc->sc_data++ = ki2c_readreg(sc, DATA); 273 sc->sc_resid--; 274 275 if (sc->sc_resid == 0) { /* Completed */ 276 ki2c_writereg(sc, CONTROL, 0); 277 goto out; 278 } 279 } else { 280 #if 0 281 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 282 /* No slave responded. */ 283 sc->sc_flags |= I2C_ERROR; 284 goto out; 285 } 286 #endif 287 288 if (sc->sc_resid == 0) { 289 x = ki2c_readreg(sc, CONTROL) | I2C_CT_STOP; 290 ki2c_writereg(sc, CONTROL, x); 291 } else { 292 ki2c_writereg(sc, DATA, *sc->sc_data++); 293 sc->sc_resid--; 294 } 295 } 296 } 297 298 out: 299 if (isr & I2C_INT_STOP) { 300 ki2c_writereg(sc, CONTROL, 0); 301 sc->sc_flags &= ~I2C_BUSY; 302 } 303 304 ki2c_writereg(sc, ISR, isr); 305 306 return 1; 307 } 308 309 int 310 ki2c_poll(struct ki2c_softc *sc, int timo) 311 { 312 while (sc->sc_flags & I2C_BUSY) { 313 if (ki2c_readreg(sc, ISR)) 314 ki2c_intr(sc); 315 timo -= 100; 316 if (timo < 0) { 317 printf("i2c_poll: timeout\n"); 318 return -1; 319 } 320 delay(100); 321 } 322 return 0; 323 } 324 325 int 326 ki2c_start(struct ki2c_softc *sc, int addr, int subaddr, void *data, int len) 327 { 328 int rw = (sc->sc_flags & I2C_READING) ? 1 : 0; 329 int timo, x; 330 331 KASSERT((addr & 1) == 0); 332 333 sc->sc_data = data; 334 sc->sc_resid = len; 335 sc->sc_flags |= I2C_BUSY; 336 337 timo = 1000 + len * 200; 338 339 /* XXX TAS3001 sometimes takes 50ms to finish writing registers. */ 340 /* if (addr == 0x68) */ 341 timo += 100000; 342 343 ki2c_writereg(sc, ADDR, addr | rw); 344 ki2c_writereg(sc, SUBADDR, subaddr); 345 346 x = ki2c_readreg(sc, CONTROL) | I2C_CT_ADDR; 347 ki2c_writereg(sc, CONTROL, x); 348 349 if (ki2c_poll(sc, timo)) 350 return -1; 351 if (sc->sc_flags & I2C_ERROR) { 352 printf("I2C_ERROR\n"); 353 return -1; 354 } 355 return 0; 356 } 357 358 int 359 ki2c_read(struct ki2c_softc *sc, int addr, int subaddr, void *data, int len) 360 { 361 sc->sc_flags = I2C_READING; 362 #ifdef KI2C_DEBUG 363 printf("ki2c_read: %02x %d\n", addr, len); 364 #endif 365 return ki2c_start(sc, addr, subaddr, data, len); 366 } 367 368 int 369 ki2c_write(struct ki2c_softc *sc, int addr, int subaddr, void *data, int len) 370 { 371 sc->sc_flags = 0; 372 #ifdef KI2C_DEBUG 373 printf("ki2c_write: %02x %d\n",addr,len); 374 #endif 375 return ki2c_start(sc, addr, subaddr, data, len); 376 } 377 378 static int 379 ki2c_i2c_acquire_bus(void *cookie, int flags) 380 { 381 struct ki2c_softc *sc = cookie; 382 383 mutex_enter(&sc->sc_buslock); 384 return 0; 385 } 386 387 static void 388 ki2c_i2c_release_bus(void *cookie, int flags) 389 { 390 struct ki2c_softc *sc = cookie; 391 392 mutex_exit(&sc->sc_buslock); 393 } 394 395 int 396 ki2c_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *vcmd, 397 size_t cmdlen, void *vbuf, size_t buflen, int flags) 398 { 399 struct ki2c_softc *sc = cookie; 400 int i; 401 size_t w_len; 402 uint8_t *wp; 403 uint8_t wrbuf[I2C_EXEC_MAX_CMDLEN + I2C_EXEC_MAX_CMDLEN]; 404 405 /* 406 * We don't have any idea if the ki2c controller can execute 407 * i2c quick_{read,write} operations, so if someone tries one, 408 * return an error. 409 */ 410 if (cmdlen == 0 && buflen == 0) 411 return -1; 412 413 /* we handle the subaddress stuff ourselves */ 414 ki2c_setmode(sc, I2C_STDMODE); 415 416 /* Write-buffer defaults to vcmd */ 417 wp = (uint8_t *)(__UNCONST(vcmd)); 418 w_len = cmdlen; 419 420 /* 421 * Concatenate vcmd and vbuf for write operations 422 * 423 * Drivers written specifically for ki2c might already do this, 424 * but "generic" i2c drivers still provide separate arguments 425 * for the cmd and buf parts of iic_smbus_write_{byte,word}. 426 */ 427 if (I2C_OP_WRITE_P(op) && buflen != 0) { 428 if (cmdlen == 0) { 429 wp = (uint8_t *)vbuf; 430 w_len = buflen; 431 } else { 432 KASSERT((cmdlen + buflen) <= sizeof(wrbuf)); 433 wp = (uint8_t *)(__UNCONST(vcmd)); 434 w_len = 0; 435 for (i = 0; i < cmdlen; i++) 436 wrbuf[w_len++] = *wp++; 437 wp = (uint8_t *)vbuf; 438 for (i = 0; i < buflen; i++) 439 wrbuf[w_len++] = *wp++; 440 wp = wrbuf; 441 } 442 } 443 444 if (ki2c_write(sc, addr, 0, wp, w_len) !=0 ) 445 return -1; 446 447 if (I2C_OP_READ_P(op)) { 448 if (ki2c_read(sc, addr, 0, vbuf, buflen) !=0 ) 449 return -1; 450 } 451 return 0; 452 } 453
Indexes created Mon Sep 29 03:10:08 GMT 2025