ki2c.c revision 1.3
1 /* $NetBSD: ki2c.c,v 1.3 2005/08/10 14:26:46 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 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 struct cfattach ki2c_ca = { 63 "ki2c", {}, sizeof(struct ki2c_softc), ki2c_match, ki2c_attach 64 }; 65 66 int 67 ki2c_match(parent, match, aux) 68 struct device *parent; 69 struct cfdata *match; 70 void *aux; 71 { 72 struct confargs *ca = aux; 73 74 if (strcmp(ca->ca_name, "i2c") == 0) 75 return 1; 76 77 return 0; 78 } 79 80 void 81 ki2c_attach(parent, self, aux) 82 struct device *parent; 83 struct device *self; 84 void *aux; 85 { 86 struct ki2c_softc *sc = (struct ki2c_softc *)self; 87 struct confargs *ca = aux; 88 int node = ca->ca_node; 89 int rate, child, namelen; 90 struct ki2c_confargs ka; 91 struct i2cbus_attach_args iba; 92 93 char name[32]; 94 u_int reg[20]; 95 96 ca->ca_reg[0] += ca->ca_baseaddr; 97 98 if (OF_getprop(node, "AAPL,i2c-rate", &rate, 4) != 4) { 99 printf(": cannot get i2c-rate\n"); 100 return; 101 } 102 if (OF_getprop(node, "AAPL,address", &sc->sc_reg, 4) != 4) { 103 printf(": unable to find i2c address\n"); 104 return; 105 } 106 if (OF_getprop(node, "AAPL,address-step", &sc->sc_regstep, 4) != 4) { 107 printf(": unable to find i2c address step\n"); 108 return; 109 } 110 111 printf("\n"); 112 113 ki2c_writereg(sc, STATUS, 0); 114 ki2c_writereg(sc, ISR, 0); 115 ki2c_writereg(sc, IER, 0); 116 117 ki2c_setmode(sc, I2C_STDSUBMODE); 118 ki2c_setspeed(sc, I2C_100kHz); /* XXX rate */ 119 120 lockinit(&sc->sc_buslock, PRIBIO|PCATCH, sc->sc_dev.dv_xname, 0, 0); 121 ki2c_writereg(sc, IER,I2C_INT_DATA|I2C_INT_ADDR|I2C_INT_STOP); 122 123 /* fill in the i2c tag */ 124 sc->sc_i2c.ic_cookie = sc; 125 sc->sc_i2c.ic_acquire_bus = ki2c_i2c_acquire_bus; 126 sc->sc_i2c.ic_release_bus = ki2c_i2c_release_bus; 127 sc->sc_i2c.ic_send_start = NULL; 128 sc->sc_i2c.ic_send_stop = NULL; 129 sc->sc_i2c.ic_initiate_xfer = NULL; 130 sc->sc_i2c.ic_read_byte = NULL; 131 sc->sc_i2c.ic_write_byte = NULL; 132 sc->sc_i2c.ic_exec = ki2c_i2c_exec; 133 134 iba.iba_name = "iic"; 135 iba.iba_tag = &sc->sc_i2c; 136 (void) config_found(&sc->sc_dev, &iba, iicbus_print); 137 138 139 for (child = OF_child(node); child; child = OF_peer(child)) { 140 namelen = OF_getprop(child, "name", name, sizeof(name)); 141 if (namelen < 0) 142 continue; 143 if (namelen >= sizeof(name)) 144 continue; 145 146 name[namelen] = 0; 147 ka.ka_name = name; 148 ka.ka_node = child; 149 if (OF_getprop(child, "reg", reg, sizeof(reg))>0) { 150 ka.ka_addr = reg[0]; 151 ka.ka_tag = &sc->sc_i2c; 152 config_found(self, &ka, ki2c_print); 153 } 154 } 155 } 156 157 int 158 ki2c_print(aux, ki2c) 159 void *aux; 160 const char *ki2c; 161 { 162 struct ki2c_confargs *ka = aux; 163 164 if (ki2c) { 165 aprint_normal("%s at %s", ka->ka_name, ki2c); 166 aprint_normal(" address 0x%x", ka->ka_addr); 167 } 168 return UNCONF; 169 } 170 171 u_int 172 ki2c_readreg(sc, reg) 173 struct ki2c_softc *sc; 174 int reg; 175 { 176 u_char *addr = sc->sc_reg + sc->sc_regstep * reg; 177 178 return *addr; 179 } 180 181 void 182 ki2c_writereg(sc, reg, val) 183 struct ki2c_softc *sc; 184 int reg; 185 u_int val; 186 { 187 u_char *addr = sc->sc_reg + sc->sc_regstep * reg; 188 189 *addr = val; 190 asm volatile ("eieio"); 191 delay(10); 192 } 193 194 u_int 195 ki2c_getmode(sc) 196 struct ki2c_softc *sc; 197 { 198 return ki2c_readreg(sc, MODE) & I2C_MODE; 199 } 200 201 void 202 ki2c_setmode(sc, mode) 203 struct ki2c_softc *sc; 204 u_int mode; 205 { 206 u_int x; 207 208 KASSERT((mode & ~I2C_MODE) == 0); 209 x = ki2c_readreg(sc, MODE); 210 x &= ~I2C_MODE; 211 x |= mode; 212 ki2c_writereg(sc, MODE, x); 213 } 214 215 u_int 216 ki2c_getspeed(sc) 217 struct ki2c_softc *sc; 218 { 219 return ki2c_readreg(sc, MODE) & I2C_SPEED; 220 } 221 222 void 223 ki2c_setspeed(sc, speed) 224 struct ki2c_softc *sc; 225 u_int speed; 226 { 227 u_int x; 228 229 KASSERT((speed & ~I2C_SPEED) == 0); 230 x = ki2c_readreg(sc, MODE); 231 x &= ~I2C_SPEED; 232 x |= speed; 233 ki2c_writereg(sc, MODE, x); 234 } 235 236 int 237 ki2c_intr(sc) 238 struct ki2c_softc *sc; 239 { 240 u_int isr, x; 241 242 isr = ki2c_readreg(sc, ISR); 243 if (isr & I2C_INT_ADDR) { 244 #if 0 245 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 246 /* No slave responded. */ 247 sc->sc_flags |= I2C_ERROR; 248 goto out; 249 } 250 #endif 251 252 if (sc->sc_flags & I2C_READING) { 253 if (sc->sc_resid > 1) { 254 x = ki2c_readreg(sc, CONTROL); 255 x |= I2C_CT_AAK; 256 ki2c_writereg(sc, CONTROL, x); 257 } 258 } else { 259 ki2c_writereg(sc, DATA, *sc->sc_data++); 260 sc->sc_resid--; 261 } 262 } 263 264 if (isr & I2C_INT_DATA) { 265 if (sc->sc_flags & I2C_READING) { 266 *sc->sc_data++ = ki2c_readreg(sc, DATA); 267 sc->sc_resid--; 268 269 if (sc->sc_resid == 0) { /* Completed */ 270 ki2c_writereg(sc, CONTROL, 0); 271 goto out; 272 } 273 } else { 274 #if 0 275 if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) { 276 /* No slave responded. */ 277 sc->sc_flags |= I2C_ERROR; 278 goto out; 279 } 280 #endif 281 282 if (sc->sc_resid == 0) { 283 x = ki2c_readreg(sc, CONTROL) | I2C_CT_STOP; 284 ki2c_writereg(sc, CONTROL, x); 285 } else { 286 ki2c_writereg(sc, DATA, *sc->sc_data++); 287 sc->sc_resid--; 288 } 289 } 290 } 291 292 out: 293 if (isr & I2C_INT_STOP) { 294 ki2c_writereg(sc, CONTROL, 0); 295 sc->sc_flags &= ~I2C_BUSY; 296 } 297 298 ki2c_writereg(sc, ISR, isr); 299 300 return 1; 301 } 302 303 int 304 ki2c_poll(sc, timo) 305 struct ki2c_softc *sc; 306 int timo; 307 { 308 while (sc->sc_flags & I2C_BUSY) { 309 if (ki2c_readreg(sc, ISR)) 310 ki2c_intr(sc); 311 timo -= 100; 312 if (timo < 0) { 313 printf("i2c_poll: timeout\n"); 314 return -1; 315 } 316 delay(100); 317 } 318 return 0; 319 } 320 321 int 322 ki2c_start(sc, addr, subaddr, data, len) 323 struct ki2c_softc *sc; 324 int addr, subaddr, len; 325 void *data; 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(sc, addr, subaddr, data, len) 359 struct ki2c_softc *sc; 360 int addr, subaddr, len; 361 void *data; 362 { 363 sc->sc_flags = I2C_READING; 364 #ifdef KI2C_DEBUG 365 printf("ki2c_read: %02x %d\n", addr, len); 366 #endif 367 return ki2c_start(sc, addr, subaddr, data, len); 368 } 369 370 int 371 ki2c_write(sc, addr, subaddr, data, len) 372 struct ki2c_softc *sc; 373 int addr, subaddr, len; 374 void *data; 375 { 376 sc->sc_flags = 0; 377 #ifdef KI2C_DEBUG 378 printf("ki2c_write: %02x %d\n",addr,len); 379 #endif 380 return ki2c_start(sc, addr, subaddr, data, len); 381 } 382 383 static int 384 ki2c_i2c_acquire_bus(void *cookie, int flags) 385 { 386 struct ki2c_softc *sc = cookie; 387 388 return (lockmgr(&sc->sc_buslock, LK_EXCLUSIVE, NULL)); 389 } 390 391 static void 392 ki2c_i2c_release_bus(void *cookie, int flags) 393 { 394 struct ki2c_softc *sc = cookie; 395 396 (void) lockmgr(&sc->sc_buslock, LK_RELEASE, NULL); 397 } 398 399 int 400 ki2c_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *vcmd, 401 size_t cmdlen, void *vbuf, size_t buflen, int flags) 402 { 403 struct ki2c_softc *sc = cookie; 404 405 /* we handle the subaddress stuff ourselves */ 406 ki2c_setmode(sc, I2C_STDMODE); 407 408 if (ki2c_write(sc, addr, 0, __UNCONST(vcmd), cmdlen) !=0 ) 409 return -1; 410 if (I2C_OP_READ_P(op)) 411 { 412 if (ki2c_read(sc, addr, 0, vbuf, buflen) !=0 ) 413 return -1; 414 } 415 return 0; 416 } 417
Indexes created Tue Sep 23 14:10:03 GMT 2025