ki2c.c revision 1.22
1 /* $NetBSD: ki2c.c,v 1.22 2017/09/22 03:09:51 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 #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_acquire_bus(void *, int); 62 static void ki2c_i2c_release_bus(void *, int); 63 static int ki2c_i2c_exec(void *, i2c_op_t, i2c_addr_t, const void *, size_t, 64 void *, size_t, int); 65 66 67 CFATTACH_DECL_NEW(ki2c, sizeof(struct ki2c_softc), ki2c_match, ki2c_attach, 68 NULL, NULL); 69 70 int 71 ki2c_match(device_t parent, cfdata_t match, void *aux) 72 { 73 struct confargs *ca = aux; 74 75 if (strcmp(ca->ca_name, "i2c") == 0) 76 return 1; 77 78 return 0; 79 } 80 81 void 82 ki2c_attach(device_t parent, device_t self, void *aux) 83 { 84 struct ki2c_softc *sc = device_private(self); 85 struct confargs *ca = aux; 86 int node = ca->ca_node; 87 uint32_t addr; 88 int rate, child, /*namelen,*/ i2cbus; 89 struct i2cbus_attach_args iba; 90 prop_dictionary_t dict = device_properties(self); 91 prop_array_t cfg; 92 int devs; 93 char compat[256]; 94 prop_dictionary_t dev; 95 prop_data_t data; 96 char name[32]; 97 98 sc->sc_dev = self; 99 sc->sc_tag = ca->ca_tag; 100 ca->ca_reg[0] += ca->ca_baseaddr; 101 102 if (OF_getprop(node, "AAPL,i2c-rate", &rate, 4) != 4) { 103 aprint_error(": cannot get i2c-rate\n"); 104 return; 105 } 106 if (OF_getprop(node, "AAPL,address", &addr, 4) != 4) { 107 aprint_error(": unable to find i2c address\n"); 108 return; 109 } 110 if (bus_space_map(sc->sc_tag, addr, PAGE_SIZE, 0, &sc->sc_bh) != 0) { 111 aprint_error_dev(sc->sc_dev, "failed to map registers\n"); 112 return; 113 } 114 115 if (OF_getprop(node, "AAPL,address-step", &sc->sc_regstep, 4) != 4) { 116 aprint_error(": unable to find i2c address step\n"); 117 return; 118 } 119 120 printf("\n"); 121 122 ki2c_writereg(sc, STATUS, 0); 123 ki2c_writereg(sc, ISR, 0); 124 ki2c_writereg(sc, IER, 0); 125 126 ki2c_setmode(sc, I2C_STDSUBMODE); 127 ki2c_setspeed(sc, I2C_100kHz); /* XXX rate */ 128 129 mutex_init(&sc->sc_buslock, MUTEX_DEFAULT, IPL_NONE); 130 ki2c_writereg(sc, IER,I2C_INT_DATA|I2C_INT_ADDR|I2C_INT_STOP); 131 132 cfg = prop_array_create(); 133 prop_dictionary_set(dict, "i2c-child-devices", cfg); 134 prop_object_release(cfg); 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 devs = OF_child(i2cbus); 153 while (devs != 0) { 154 if (OF_getprop(devs, "name", name, 32) == 0) 155 goto skip; 156 if (OF_getprop(devs, "compatible", compat, 256) == 0) { 157 /* some i2c device nodes don't have 'compatible' */ 158 memset(compat, 0, 256); 159 strncpy(compat, name, 256); 160 } 161 if (OF_getprop(devs, "reg", &addr, 4) == 0) 162 if (OF_getprop(devs, "i2c-address", &addr, 4) == 0) 163 goto skip; 164 addr = (addr & 0xff) >> 1; 165 DPRINTF("-> %s@%x\n", name, addr); 166 dev = prop_dictionary_create(); 167 prop_dictionary_set_cstring(dev, "name", name); 168 data = prop_data_create_data(compat, strlen(compat)+1); 169 prop_dictionary_set(dev, "compatible", data); 170 prop_object_release(data); 171 prop_dictionary_set_uint32(dev, "addr", addr); 172 prop_dictionary_set_uint64(dev, "cookie", node); 173 prop_array_add(cfg, dev); 174 prop_object_release(dev); 175 skip: 176 devs = OF_peer(devs); 177 } 178 179 /* fill in the i2c tag */ 180 sc->sc_i2c.ic_cookie = sc; 181 sc->sc_i2c.ic_acquire_bus = ki2c_i2c_acquire_bus; 182 sc->sc_i2c.ic_release_bus = ki2c_i2c_release_bus; 183 sc->sc_i2c.ic_send_start = NULL; 184 sc->sc_i2c.ic_send_stop = NULL; 185 sc->sc_i2c.ic_initiate_xfer = NULL; 186 sc->sc_i2c.ic_read_byte = NULL; 187 sc->sc_i2c.ic_write_byte = NULL; 188 sc->sc_i2c.ic_exec = ki2c_i2c_exec; 189 190 memset(&iba, 0, sizeof(iba)); 191 iba.iba_tag = &sc->sc_i2c; 192 (void) config_found_ia(sc->sc_dev, "i2cbus", &iba, iicbus_print); 193 194 } 195 196 uint8_t 197 ki2c_readreg(struct ki2c_softc *sc, int reg) 198 { 199 200 return bus_space_read_1(sc->sc_tag, sc->sc_bh, sc->sc_regstep * reg); 201 } 202 203 void 204 ki2c_writereg(struct ki2c_softc *sc, int reg, uint8_t val) 205 { 206 207 bus_space_write_1(sc->sc_tag, sc->sc_bh, reg * sc->sc_regstep, val); 208 delay(10); 209 } 210 211 u_int 212 ki2c_getmode(struct ki2c_softc *sc) 213 { 214 return ki2c_readreg(sc, MODE) & I2C_MODE; 215 } 216 217 void 218 ki2c_setmode(struct ki2c_softc *sc, u_int mode) 219 { 220 u_int x; 221 222 KASSERT((mode & ~I2C_MODE) == 0); 223 x = ki2c_readreg(sc, MODE); 224 x &= ~I2C_MODE; 225 x |= mode; 226 ki2c_writereg(sc, MODE, x); 227 } 228 229 u_int 230 ki2c_getspeed(struct ki2c_softc *sc) 231 { 232 return ki2c_readreg(sc, MODE) & I2C_SPEED; 233 } 234 235 void 236 ki2c_setspeed(struct ki2c_softc *sc, u_int speed) 237 { 238 u_int x; 239 240 KASSERT((speed & ~I2C_SPEED) == 0); 241 x = ki2c_readreg(sc, MODE); 242 x &= ~I2C_SPEED; 243 x |= speed; 244 ki2c_writereg(sc, MODE, x); 245 } 246 247 int 248 ki2c_intr(struct ki2c_softc *sc) 249 { 250 u_int isr, x; 251 252 isr = ki2c_readreg(sc, ISR); 253 if (isr & I2C_INT_ADDR) { 254 #if 0 255 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 256 /* No slave responded. */ 257 sc->sc_flags |= I2C_ERROR; 258 goto out; 259 } 260 #endif 261 262 if (sc->sc_flags & I2C_READING) { 263 if (sc->sc_resid > 1) { 264 x = ki2c_readreg(sc, CONTROL); 265 x |= I2C_CT_AAK; 266 ki2c_writereg(sc, CONTROL, x); 267 } 268 } else { 269 ki2c_writereg(sc, DATA, *sc->sc_data++); 270 sc->sc_resid--; 271 } 272 } 273 274 if (isr & I2C_INT_DATA) { 275 if (sc->sc_flags & I2C_READING) { 276 *sc->sc_data++ = ki2c_readreg(sc, DATA); 277 sc->sc_resid--; 278 279 if (sc->sc_resid == 0) { /* Completed */ 280 ki2c_writereg(sc, CONTROL, 0); 281 goto out; 282 } 283 } else { 284 #if 0 285 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 286 /* No slave responded. */ 287 sc->sc_flags |= I2C_ERROR; 288 goto out; 289 } 290 #endif 291 292 if (sc->sc_resid == 0) { 293 x = ki2c_readreg(sc, CONTROL) | I2C_CT_STOP; 294 ki2c_writereg(sc, CONTROL, x); 295 } else { 296 ki2c_writereg(sc, DATA, *sc->sc_data++); 297 sc->sc_resid--; 298 } 299 } 300 } 301 302 out: 303 if (isr & I2C_INT_STOP) { 304 ki2c_writereg(sc, CONTROL, 0); 305 sc->sc_flags &= ~I2C_BUSY; 306 } 307 308 ki2c_writereg(sc, ISR, isr); 309 310 return 1; 311 } 312 313 int 314 ki2c_poll(struct ki2c_softc *sc, int timo) 315 { 316 while (sc->sc_flags & I2C_BUSY) { 317 if (ki2c_readreg(sc, ISR)) 318 ki2c_intr(sc); 319 timo -= 100; 320 if (timo < 0) { 321 DPRINTF("i2c_poll: timeout\n"); 322 return -1; 323 } 324 delay(100); 325 } 326 return 0; 327 } 328 329 int 330 ki2c_start(struct ki2c_softc *sc, int addr, int subaddr, void *data, int len) 331 { 332 int rw = (sc->sc_flags & I2C_READING) ? 1 : 0; 333 int timo, x; 334 335 KASSERT((addr & 1) == 0); 336 337 sc->sc_data = data; 338 sc->sc_resid = len; 339 sc->sc_flags |= I2C_BUSY; 340 341 timo = 1000 + len * 200; 342 343 /* XXX TAS3001 sometimes takes 50ms to finish writing registers. */ 344 /* if (addr == 0x68) */ 345 timo += 100000; 346 347 ki2c_writereg(sc, ADDR, addr | rw); 348 ki2c_writereg(sc, SUBADDR, subaddr); 349 350 x = ki2c_readreg(sc, CONTROL) | I2C_CT_ADDR; 351 ki2c_writereg(sc, CONTROL, x); 352 353 if (ki2c_poll(sc, timo)) 354 return -1; 355 if (sc->sc_flags & I2C_ERROR) { 356 DPRINTF("I2C_ERROR\n"); 357 return -1; 358 } 359 return 0; 360 } 361 362 int 363 ki2c_read(struct ki2c_softc *sc, int addr, int subaddr, void *data, int len) 364 { 365 sc->sc_flags = I2C_READING; 366 DPRINTF("ki2c_read: %02x %d\n", addr, len); 367 return ki2c_start(sc, addr, subaddr, data, len); 368 } 369 370 int 371 ki2c_write(struct ki2c_softc *sc, int addr, int subaddr, void *data, int len) 372 { 373 sc->sc_flags = 0; 374 DPRINTF("ki2c_write: %02x %d\n",addr,len); 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 (w_len > 0) 445 if (ki2c_write(sc, addr << 1, 0, wp, w_len) !=0 ) 446 return -1; 447 448 if (I2C_OP_READ_P(op)) { 449 if (ki2c_read(sc, addr << 1, 0, vbuf, buflen) !=0 ) 450 return -1; 451 } 452 return 0; 453 } 454
Indexes created Sat Sep 27 14:09:57 GMT 2025