ki2c.c revision 1.27
1 /* $NetBSD: ki2c.c,v 1.27 2019/12/22 23:23:30 thorpej 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 #ifdef KI2C_DEBUG 41 #define DPRINTF printf 42 #else 43 #define DPRINTF while (0) printf 44 #endif 45 46 int ki2c_match(device_t, cfdata_t, void *); 47 void ki2c_attach(device_t, device_t, void *); 48 inline uint8_t ki2c_readreg(struct ki2c_softc *, int); 49 inline void ki2c_writereg(struct ki2c_softc *, int, uint8_t); 50 u_int ki2c_getmode(struct ki2c_softc *); 51 void ki2c_setmode(struct ki2c_softc *, u_int); 52 u_int ki2c_getspeed(struct ki2c_softc *); 53 void ki2c_setspeed(struct ki2c_softc *, u_int); 54 int ki2c_intr(struct ki2c_softc *); 55 int ki2c_poll(struct ki2c_softc *, int); 56 int ki2c_start(struct ki2c_softc *, int, int, void *, int); 57 int ki2c_read(struct ki2c_softc *, int, int, void *, int); 58 int ki2c_write(struct ki2c_softc *, int, int, void *, int); 59 60 /* I2C glue */ 61 static int ki2c_i2c_exec(void *, i2c_op_t, i2c_addr_t, const void *, size_t, 62 void *, size_t, int); 63 64 65 CFATTACH_DECL_NEW(ki2c, sizeof(struct ki2c_softc), ki2c_match, ki2c_attach, 66 NULL, NULL); 67 68 int 69 ki2c_match(device_t parent, cfdata_t match, 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(device_t parent, device_t self, void *aux) 81 { 82 struct ki2c_softc *sc = device_private(self); 83 struct confargs *ca = aux; 84 int node = ca->ca_node; 85 uint32_t addr, channel, reg; 86 int rate, child, /*namelen,*/ i2cbus; 87 struct i2cbus_attach_args iba; 88 prop_dictionary_t dict = device_properties(self); 89 prop_array_t cfg; 90 int devs, devc; 91 char compat[256], num[8], descr[32]; 92 prop_dictionary_t dev; 93 prop_data_t data; 94 char name[32]; 95 96 sc->sc_dev = self; 97 sc->sc_tag = ca->ca_tag; 98 ca->ca_reg[0] += ca->ca_baseaddr; 99 100 if (OF_getprop(node, "AAPL,i2c-rate", &rate, 4) != 4) { 101 aprint_error(": cannot get i2c-rate\n"); 102 return; 103 } 104 if (OF_getprop(node, "AAPL,address", &addr, 4) != 4) { 105 aprint_error(": unable to find i2c address\n"); 106 return; 107 } 108 if (bus_space_map(sc->sc_tag, addr, PAGE_SIZE, 0, &sc->sc_bh) != 0) { 109 aprint_error_dev(sc->sc_dev, "failed to map registers\n"); 110 return; 111 } 112 113 if (OF_getprop(node, "AAPL,address-step", &sc->sc_regstep, 4) != 4) { 114 aprint_error(": unable to find i2c address step\n"); 115 return; 116 } 117 118 printf("\n"); 119 120 ki2c_writereg(sc, STATUS, 0); 121 ki2c_writereg(sc, ISR, 0); 122 ki2c_writereg(sc, IER, 0); 123 124 ki2c_setmode(sc, I2C_STDSUBMODE); 125 ki2c_setspeed(sc, I2C_100kHz); /* XXX rate */ 126 127 ki2c_writereg(sc, IER,I2C_INT_DATA|I2C_INT_ADDR|I2C_INT_STOP); 128 129 cfg = prop_array_create(); 130 prop_dictionary_set(dict, "i2c-child-devices", cfg); 131 prop_object_release(cfg); 132 133 /* 134 * newer OF puts I2C devices under 'i2c-bus' instead of attaching them 135 * directly to the ki2c node so we just check if we have a child named 136 * 'i2c-bus' and if so we attach its children, not ours 137 * 138 * XXX 139 * should probably check for multiple i2c-bus children 140 */ 141 i2cbus = 0; 142 channel = 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 OF_getprop(child, "reg", &channel, sizeof(channel)); 148 i2cbus = child; 149 DPRINTF("found channel %x\n", channel); 150 } 151 child = OF_peer(child); 152 } 153 if (i2cbus == 0) 154 i2cbus = node; 155 156 devs = OF_child(i2cbus); 157 while (devs != 0) { 158 if (OF_getprop(devs, "name", name, 32) <= 0) 159 goto skip; 160 if (OF_getprop(devs, "compatible", compat, 256) <= 0) { 161 /* some i2c device nodes don't have 'compatible' */ 162 memset(compat, 0, 256); 163 strncpy(compat, name, 256); 164 } 165 if (OF_getprop(devs, "reg", &addr, 4) <= 0) 166 if (OF_getprop(devs, "i2c-address", &addr, 4) <= 0) 167 goto skip; 168 addr |= channel << 8; 169 addr = addr >> 1; 170 DPRINTF("-> %s@%x\n", name, addr); 171 dev = prop_dictionary_create(); 172 prop_dictionary_set_cstring(dev, "name", name); 173 data = prop_data_create_data(compat, strlen(compat)+1); 174 prop_dictionary_set(dev, "compatible", data); 175 prop_object_release(data); 176 prop_dictionary_set_uint32(dev, "addr", addr); 177 prop_dictionary_set_uint64(dev, "cookie", devs); 178 /* look for location info for sensors */ 179 devc = OF_child(devs); 180 while (devc != 0) { 181 if (OF_getprop(devc, "reg", ®, 4) < 4) goto nope; 182 if (OF_getprop(devc, "location", descr, 32) <= 0) 183 goto nope; 184 DPRINTF("found '%s' at %02x\n", descr, reg); 185 snprintf(num, 7, "s%02x", reg); 186 prop_dictionary_set_cstring(dev, num, descr); 187 nope: 188 devc = OF_peer(devc); 189 } 190 prop_array_add(cfg, dev); 191 prop_object_release(dev); 192 skip: 193 devs = OF_peer(devs); 194 } 195 196 /* fill in the i2c tag */ 197 iic_tag_init(&sc->sc_i2c); 198 sc->sc_i2c.ic_cookie = sc; 199 sc->sc_i2c.ic_exec = ki2c_i2c_exec; 200 201 memset(&iba, 0, sizeof(iba)); 202 iba.iba_tag = &sc->sc_i2c; 203 (void) config_found_ia(sc->sc_dev, "i2cbus", &iba, iicbus_print); 204 205 } 206 207 uint8_t 208 ki2c_readreg(struct ki2c_softc *sc, int reg) 209 { 210 211 return bus_space_read_1(sc->sc_tag, sc->sc_bh, sc->sc_regstep * reg); 212 } 213 214 void 215 ki2c_writereg(struct ki2c_softc *sc, int reg, uint8_t val) 216 { 217 218 bus_space_write_1(sc->sc_tag, sc->sc_bh, reg * sc->sc_regstep, val); 219 delay(10); 220 } 221 222 u_int 223 ki2c_getmode(struct ki2c_softc *sc) 224 { 225 return ki2c_readreg(sc, MODE) & I2C_MODE; 226 } 227 228 void 229 ki2c_setmode(struct ki2c_softc *sc, u_int mode) 230 { 231 ki2c_writereg(sc, MODE, mode); 232 } 233 234 u_int 235 ki2c_getspeed(struct ki2c_softc *sc) 236 { 237 return ki2c_readreg(sc, MODE) & I2C_SPEED; 238 } 239 240 void 241 ki2c_setspeed(struct ki2c_softc *sc, u_int speed) 242 { 243 u_int x; 244 245 KASSERT((speed & ~I2C_SPEED) == 0); 246 x = ki2c_readreg(sc, MODE); 247 x &= ~I2C_SPEED; 248 x |= speed; 249 ki2c_writereg(sc, MODE, x); 250 } 251 252 int 253 ki2c_intr(struct ki2c_softc *sc) 254 { 255 u_int isr, x; 256 257 isr = ki2c_readreg(sc, ISR); 258 if (isr & I2C_INT_ADDR) { 259 #if 0 260 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 261 /* No slave responded. */ 262 sc->sc_flags |= I2C_ERROR; 263 goto out; 264 } 265 #endif 266 267 if (sc->sc_flags & I2C_READING) { 268 if (sc->sc_resid > 1) { 269 x = ki2c_readreg(sc, CONTROL); 270 x |= I2C_CT_AAK; 271 ki2c_writereg(sc, CONTROL, x); 272 } 273 } else { 274 ki2c_writereg(sc, DATA, *sc->sc_data++); 275 sc->sc_resid--; 276 } 277 } 278 279 if (isr & I2C_INT_DATA) { 280 if (sc->sc_flags & I2C_READING) { 281 *sc->sc_data++ = ki2c_readreg(sc, DATA); 282 sc->sc_resid--; 283 284 if (sc->sc_resid == 0) { /* Completed */ 285 ki2c_writereg(sc, CONTROL, 0); 286 goto out; 287 } 288 } else { 289 #if 0 290 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 291 /* No slave responded. */ 292 sc->sc_flags |= I2C_ERROR; 293 goto out; 294 } 295 #endif 296 297 if (sc->sc_resid == 0) { 298 x = ki2c_readreg(sc, CONTROL) | I2C_CT_STOP; 299 ki2c_writereg(sc, CONTROL, x); 300 } else { 301 ki2c_writereg(sc, DATA, *sc->sc_data++); 302 sc->sc_resid--; 303 } 304 } 305 } 306 307 out: 308 if (isr & I2C_INT_STOP) { 309 ki2c_writereg(sc, CONTROL, 0); 310 sc->sc_flags &= ~I2C_BUSY; 311 } 312 313 ki2c_writereg(sc, ISR, isr); 314 315 return 1; 316 } 317 318 int 319 ki2c_poll(struct ki2c_softc *sc, 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 DPRINTF("i2c_poll: timeout\n"); 327 return -1; 328 } 329 delay(100); 330 } 331 return 0; 332 } 333 334 int 335 ki2c_start(struct ki2c_softc *sc, int addr, int subaddr, void *data, int len) 336 { 337 int rw = (sc->sc_flags & I2C_READING) ? 1 : 0; 338 int timo, x; 339 340 KASSERT((addr & 1) == 0); 341 342 sc->sc_data = data; 343 sc->sc_resid = len; 344 sc->sc_flags |= I2C_BUSY; 345 346 timo = 1000 + len * 200; 347 348 /* XXX TAS3001 sometimes takes 50ms to finish writing registers. */ 349 /* if (addr == 0x68) */ 350 timo += 100000; 351 352 ki2c_writereg(sc, ADDR, addr | rw); 353 ki2c_writereg(sc, SUBADDR, subaddr); 354 355 x = ki2c_readreg(sc, CONTROL) | I2C_CT_ADDR; 356 ki2c_writereg(sc, CONTROL, x); 357 358 if (ki2c_poll(sc, timo)) 359 return -1; 360 if (sc->sc_flags & I2C_ERROR) { 361 DPRINTF("I2C_ERROR\n"); 362 return -1; 363 } 364 return 0; 365 } 366 367 int 368 ki2c_read(struct ki2c_softc *sc, int addr, int subaddr, void *data, int len) 369 { 370 sc->sc_flags = I2C_READING; 371 DPRINTF("ki2c_read: %02x %d\n", addr, len); 372 return ki2c_start(sc, addr, subaddr, data, len); 373 } 374 375 int 376 ki2c_write(struct ki2c_softc *sc, int addr, int subaddr, void *data, int len) 377 { 378 sc->sc_flags = 0; 379 DPRINTF("ki2c_write: %02x %d\n",addr,len); 380 return ki2c_start(sc, addr, subaddr, data, len); 381 } 382 383 int 384 ki2c_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *vcmd, 385 size_t cmdlen, void *vbuf, size_t buflen, int flags) 386 { 387 struct ki2c_softc *sc = cookie; 388 int i; 389 size_t w_len; 390 uint8_t *wp; 391 uint8_t wrbuf[I2C_EXEC_MAX_CMDLEN + I2C_EXEC_MAX_CMDLEN]; 392 uint8_t channel; 393 394 /* 395 * We don't have any idea if the ki2c controller can execute 396 * i2c quick_{read,write} operations, so if someone tries one, 397 * return an error. 398 */ 399 if (cmdlen == 0 && buflen == 0) 400 return -1; 401 402 channel = (addr & 0xf80) ? 0x10 : 0x00; 403 addr &= 0x7f; 404 405 406 /* we handle the subaddress stuff ourselves */ 407 ki2c_setmode(sc, channel | I2C_STDMODE); 408 409 /* Write-buffer defaults to vcmd */ 410 wp = (uint8_t *)(__UNCONST(vcmd)); 411 w_len = cmdlen; 412 413 /* 414 * Concatenate vcmd and vbuf for write operations 415 * 416 * Drivers written specifically for ki2c might already do this, 417 * but "generic" i2c drivers still provide separate arguments 418 * for the cmd and buf parts of iic_smbus_write_{byte,word}. 419 */ 420 if (I2C_OP_WRITE_P(op) && buflen != 0) { 421 if (cmdlen == 0) { 422 wp = (uint8_t *)vbuf; 423 w_len = buflen; 424 } else { 425 KASSERT((cmdlen + buflen) <= sizeof(wrbuf)); 426 wp = (uint8_t *)(__UNCONST(vcmd)); 427 w_len = 0; 428 for (i = 0; i < cmdlen; i++) 429 wrbuf[w_len++] = *wp++; 430 wp = (uint8_t *)vbuf; 431 for (i = 0; i < buflen; i++) 432 wrbuf[w_len++] = *wp++; 433 wp = wrbuf; 434 } 435 } 436 437 if (w_len > 0) 438 if (ki2c_write(sc, addr << 1, 0, wp, w_len) !=0 ) 439 return -1; 440 441 if (I2C_OP_READ_P(op)) { 442 if (ki2c_read(sc, addr << 1, 0, vbuf, buflen) !=0 ) 443 return -1; 444 } 445 return 0; 446 } 447
Indexes created Fri Sep 26 08:10:20 GMT 2025