Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powermac/kiic.c
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1 /*- 2 * Copyright (c) 2001 Tsubai Masanari. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. The name of the author may not be used to endorse or promote products 13 * derived from this software without specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 * NetBSD: ki2c.c,v 1.11 2007/12/06 17:00:33 ad Exp 28 * Id: ki2c.c,v 1.7 2002/10/05 09:56:05 tsubai Exp 29 */ 30 31 /* 32 * Support routines for the Keywest I2C controller. 33 */ 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/module.h> 39 #include <sys/bus.h> 40 #include <sys/lock.h> 41 #include <sys/mutex.h> 42 #include <machine/resource.h> 43 #include <machine/bus.h> 44 #include <sys/rman.h> 45 46 #include <dev/iicbus/iicbus.h> 47 #include <dev/iicbus/iiconf.h> 48 #include <dev/ofw/ofw_bus.h> 49 #include "iicbus_if.h" 50 51 /* Keywest I2C Register offsets */ 52 #define MODE 0 53 #define CONTROL 1 54 #define STATUS 2 55 #define ISR 3 56 #define IER 4 57 #define ADDR 5 58 #define SUBADDR 6 59 #define DATA 7 60 #define REV 8 61 62 /* MODE */ 63 #define I2C_SPEED 0x03 /* Speed mask */ 64 #define I2C_100kHz 0x00 65 #define I2C_50kHz 0x01 66 #define I2C_25kHz 0x02 67 #define I2C_MODE 0x0c /* Mode mask */ 68 #define I2C_DUMBMODE 0x00 /* Dumb mode */ 69 #define I2C_STDMODE 0x04 /* Standard mode */ 70 #define I2C_STDSUBMODE 0x08 /* Standard mode + sub address */ 71 #define I2C_COMBMODE 0x0c /* Combined mode */ 72 #define I2C_PORT 0xf0 /* Port mask */ 73 74 /* CONTROL */ 75 #define I2C_CT_AAK 0x01 /* Send AAK */ 76 #define I2C_CT_ADDR 0x02 /* Send address(es) */ 77 #define I2C_CT_STOP 0x04 /* Send STOP */ 78 #define I2C_CT_START 0x08 /* Send START */ 79 80 /* STATUS */ 81 #define I2C_ST_BUSY 0x01 /* Busy */ 82 #define I2C_ST_LASTAAK 0x02 /* Last AAK */ 83 #define I2C_ST_LASTRW 0x04 /* Last R/W */ 84 #define I2C_ST_SDA 0x08 /* SDA */ 85 #define I2C_ST_SCL 0x10 /* SCL */ 86 87 /* ISR/IER */ 88 #define I2C_INT_DATA 0x01 /* Data byte sent/received */ 89 #define I2C_INT_ADDR 0x02 /* Address sent */ 90 #define I2C_INT_STOP 0x04 /* STOP condition sent */ 91 #define I2C_INT_START 0x08 /* START condition sent */ 92 93 /* I2C flags */ 94 #define I2C_BUSY 0x01 95 #define I2C_READING 0x02 96 #define I2C_ERROR 0x04 97 #define I2C_SELECTED 0x08 98 99 struct kiic_softc { 100 device_t sc_dev; 101 phandle_t sc_node; 102 struct mtx sc_mutex; 103 struct resource *sc_reg; 104 int sc_irqrid; 105 struct resource *sc_irq; 106 void *sc_ih; 107 u_int sc_regstep; 108 u_int sc_flags; 109 u_char *sc_data; 110 int sc_resid; 111 uint16_t sc_i2c_base; 112 device_t sc_iicbus; 113 }; 114 115 static int kiic_probe(device_t dev); 116 static int kiic_attach(device_t dev); 117 static void kiic_writereg(struct kiic_softc *sc, u_int, u_int); 118 static u_int kiic_readreg(struct kiic_softc *, u_int); 119 static void kiic_setport(struct kiic_softc *, u_int); 120 static void kiic_setmode(struct kiic_softc *, u_int); 121 static void kiic_setspeed(struct kiic_softc *, u_int); 122 static void kiic_intr(void *xsc); 123 static int kiic_transfer(device_t dev, struct iic_msg *msgs, 124 uint32_t nmsgs); 125 static phandle_t kiic_get_node(device_t bus, device_t dev); 126 127 static device_method_t kiic_methods[] = { 128 /* device interface */ 129 DEVMETHOD(device_probe, kiic_probe), 130 DEVMETHOD(device_attach, kiic_attach), 131 132 /* iicbus interface */ 133 DEVMETHOD(iicbus_callback, iicbus_null_callback), 134 DEVMETHOD(iicbus_transfer, kiic_transfer), 135 136 /* ofw_bus interface */ 137 DEVMETHOD(ofw_bus_get_node, kiic_get_node), 138 139 { 0, 0 } 140 }; 141 142 static driver_t kiic_driver = { 143 "iichb", 144 kiic_methods, 145 sizeof(struct kiic_softc) 146 }; 147 static devclass_t kiic_devclass; 148 149 DRIVER_MODULE(kiic, macio, kiic_driver, kiic_devclass, 0, 0); 150 DRIVER_MODULE(kiic, unin, kiic_driver, kiic_devclass, 0, 0); 151 152 static int 153 kiic_probe(device_t self) 154 { 155 const char *name; 156 157 name = ofw_bus_get_name(self); 158 if (name && strcmp(name, "i2c") == 0) { 159 device_set_desc(self, "Keywest I2C controller"); 160 return (0); 161 } 162 163 return (ENXIO); 164 } 165 166 static int 167 kiic_attach(device_t self) 168 { 169 struct kiic_softc *sc = device_get_softc(self); 170 int rid, rate; 171 phandle_t node; 172 char name[64]; 173 174 bzero(sc, sizeof(*sc)); 175 sc->sc_dev = self; 176 177 node = ofw_bus_get_node(self); 178 if (node == 0 || node == -1) { 179 return (EINVAL); 180 } 181 182 rid = 0; 183 sc->sc_reg = bus_alloc_resource_any(self, SYS_RES_MEMORY, 184 &rid, RF_ACTIVE); 185 if (sc->sc_reg == NULL) { 186 return (ENOMEM); 187 } 188 189 if (OF_getprop(node, "AAPL,i2c-rate", &rate, 4) != 4) { 190 device_printf(self, "cannot get i2c-rate\n"); 191 return (ENXIO); 192 } 193 if (OF_getprop(node, "AAPL,address-step", &sc->sc_regstep, 4) != 4) { 194 device_printf(self, "unable to find i2c address step\n"); 195 return (ENXIO); 196 } 197 198 /* 199 * Some Keywest I2C devices have their children attached directly 200 * underneath them. Some have a single 'iicbus' child with the 201 * devices underneath that. Sort this out, and make sure that the 202 * OFW I2C layer has the correct node. 203 * 204 * Note: the I2C children of the Uninorth bridges have two ports. 205 * In general, the port is designated in the 9th bit of the I2C 206 * address. However, for kiic devices with children attached below 207 * an i2c-bus node, the port is indicated in the 'reg' property 208 * of the i2c-bus node. 209 */ 210 211 sc->sc_node = node; 212 213 node = OF_child(node); 214 if (OF_getprop(node, "name", name, sizeof(name)) > 0) { 215 if (strcmp(name,"i2c-bus") == 0) { 216 phandle_t reg; 217 if (OF_getprop(node, "reg", ®, sizeof(reg)) > 0) 218 sc->sc_i2c_base = reg << 8; 219 220 sc->sc_node = node; 221 } 222 } 223 224 mtx_init(&sc->sc_mutex, "kiic", NULL, MTX_DEF); 225 226 sc->sc_irq = bus_alloc_resource_any(self, SYS_RES_IRQ, &sc->sc_irqrid, 227 RF_ACTIVE); 228 bus_setup_intr(self, sc->sc_irq, INTR_TYPE_MISC | INTR_MPSAFE, NULL, 229 kiic_intr, sc, &sc->sc_ih); 230 231 kiic_writereg(sc, ISR, kiic_readreg(sc, ISR)); 232 kiic_writereg(sc, STATUS, 0); 233 kiic_writereg(sc, IER, 0); 234 235 kiic_setmode(sc, I2C_STDMODE); 236 kiic_setspeed(sc, I2C_100kHz); /* XXX rate */ 237 238 kiic_writereg(sc, IER, I2C_INT_DATA | I2C_INT_ADDR | I2C_INT_STOP); 239 240 if (bootverbose) 241 device_printf(self, "Revision: %02X\n", kiic_readreg(sc, REV)); 242 243 /* Add the IIC bus layer */ 244 sc->sc_iicbus = device_add_child(self, "iicbus", -1); 245 246 return (bus_generic_attach(self)); 247 } 248 249 static void 250 kiic_writereg(struct kiic_softc *sc, u_int reg, u_int val) 251 { 252 bus_write_4(sc->sc_reg, sc->sc_regstep * reg, val); 253 DELAY(100); /* register access delay */ 254 } 255 256 static u_int 257 kiic_readreg(struct kiic_softc *sc, u_int reg) 258 { 259 return bus_read_4(sc->sc_reg, sc->sc_regstep * reg) & 0xff; 260 } 261 262 static void 263 kiic_setmode(struct kiic_softc *sc, u_int mode) 264 { 265 u_int x; 266 267 KASSERT((mode & ~I2C_MODE) == 0, ("bad mode")); 268 x = kiic_readreg(sc, MODE); 269 x &= ~I2C_MODE; 270 x |= mode; 271 kiic_writereg(sc, MODE, x); 272 } 273 274 static void 275 kiic_setport(struct kiic_softc *sc, u_int port) 276 { 277 u_int x; 278 279 KASSERT(port == 1 || port == 0, ("bad port")); 280 x = kiic_readreg(sc, MODE); 281 x &= ~I2C_PORT; 282 x |= (port << 4); 283 kiic_writereg(sc, MODE, x); 284 } 285 286 static void 287 kiic_setspeed(struct kiic_softc *sc, u_int speed) 288 { 289 u_int x; 290 291 KASSERT((speed & ~I2C_SPEED) == 0, ("bad speed")); 292 x = kiic_readreg(sc, MODE); 293 x &= ~I2C_SPEED; 294 x |= speed; 295 kiic_writereg(sc, MODE, x); 296 } 297 298 static void 299 kiic_intr(void *xsc) 300 { 301 struct kiic_softc *sc = xsc; 302 u_int isr; 303 uint32_t x; 304 305 mtx_lock(&sc->sc_mutex); 306 isr = kiic_readreg(sc, ISR); 307 308 if (isr & I2C_INT_ADDR) { 309 sc->sc_flags |= I2C_SELECTED; 310 311 if (sc->sc_flags & I2C_READING) { 312 if (sc->sc_resid > 1) { 313 x = kiic_readreg(sc, CONTROL); 314 x |= I2C_CT_AAK; 315 kiic_writereg(sc, CONTROL, x); 316 } 317 } else { 318 kiic_writereg(sc, DATA, *sc->sc_data++); 319 sc->sc_resid--; 320 } 321 } 322 323 if (isr & I2C_INT_DATA) { 324 if (sc->sc_flags & I2C_READING) { 325 if (sc->sc_resid > 0) { 326 *sc->sc_data++ = kiic_readreg(sc, DATA); 327 sc->sc_resid--; 328 } 329 if (sc->sc_resid == 0) /* done */ 330 kiic_writereg(sc, CONTROL, 0); 331 } else { 332 if (sc->sc_resid == 0) { 333 x = kiic_readreg(sc, CONTROL); 334 x |= I2C_CT_STOP; 335 kiic_writereg(sc, CONTROL, x); 336 } else { 337 kiic_writereg(sc, DATA, *sc->sc_data++); 338 sc->sc_resid--; 339 } 340 } 341 } 342 343 if (isr & I2C_INT_STOP) { 344 kiic_writereg(sc, CONTROL, 0); 345 sc->sc_flags &= ~I2C_SELECTED; 346 wakeup(sc->sc_dev); 347 } 348 349 kiic_writereg(sc, ISR, isr); 350 mtx_unlock(&sc->sc_mutex); 351 } 352 353 static int 354 kiic_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs) 355 { 356 struct kiic_softc *sc; 357 int i, x, timo, err; 358 uint16_t addr; 359 uint8_t subaddr; 360 361 sc = device_get_softc(dev); 362 timo = 100; 363 subaddr = 0; 364 365 mtx_lock(&sc->sc_mutex); 366 367 if (sc->sc_flags & I2C_BUSY) 368 mtx_sleep(dev, &sc->sc_mutex, 0, "kiic", timo); 369 370 if (sc->sc_flags & I2C_BUSY) { 371 mtx_unlock(&sc->sc_mutex); 372 return (ETIMEDOUT); 373 } 374 375 sc->sc_flags = I2C_BUSY; 376 377 /* Clear pending interrupts, and reset controller */ 378 kiic_writereg(sc, ISR, kiic_readreg(sc, ISR)); 379 kiic_writereg(sc, STATUS, 0); 380 381 for (i = 0; i < nmsgs; i++) { 382 if (msgs[i].flags & IIC_M_NOSTOP) { 383 if (msgs[i+1].flags & IIC_M_RD) 384 kiic_setmode(sc, I2C_COMBMODE); 385 else 386 kiic_setmode(sc, I2C_STDSUBMODE); 387 KASSERT(msgs[i].len == 1, ("oversize I2C message")); 388 subaddr = msgs[i].buf[0]; 389 i++; 390 } else { 391 kiic_setmode(sc, I2C_STDMODE); 392 } 393 394 sc->sc_data = msgs[i].buf; 395 sc->sc_resid = msgs[i].len; 396 sc->sc_flags = I2C_BUSY; 397 addr = msgs[i].slave; 398 timo = 1000 + sc->sc_resid * 200; 399 timo += 100000; 400 401 if (msgs[i].flags & IIC_M_RD) { 402 sc->sc_flags |= I2C_READING; 403 addr |= 1; 404 } 405 406 addr |= sc->sc_i2c_base; 407 408 kiic_setport(sc, (addr & 0x100) >> 8); 409 kiic_writereg(sc, ADDR, addr & 0xff); 410 kiic_writereg(sc, SUBADDR, subaddr); 411 412 x = kiic_readreg(sc, CONTROL) | I2C_CT_ADDR; 413 kiic_writereg(sc, CONTROL, x); 414 415 err = mtx_sleep(dev, &sc->sc_mutex, 0, "kiic", timo); 416 417 msgs[i].len -= sc->sc_resid; 418 419 if ((sc->sc_flags & I2C_ERROR) || err == EWOULDBLOCK) { 420 device_printf(sc->sc_dev, "I2C error\n"); 421 sc->sc_flags = 0; 422 mtx_unlock(&sc->sc_mutex); 423 return (-1); 424 } 425 } 426 427 sc->sc_flags = 0; 428 429 mtx_unlock(&sc->sc_mutex); 430 431 return (0); 432 } 433 434 static phandle_t 435 kiic_get_node(device_t bus, device_t dev) 436 { 437 struct kiic_softc *sc; 438 439 sc = device_get_softc(bus); 440 /* We only have one child, the I2C bus, which needs our own node. */ 441 442 return sc->sc_node; 443 } 444
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