1 /* 2 * Driver for the Renesas RCar I2C unit 3 * 4 * Copyright (C) 2014 Wolfram Sang <wsa@sang-engineering.com> 5 * 6 * Copyright (C) 2012-14 Renesas Solutions Corp. 7 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> 8 * 9 * This file is based on the drivers/i2c/busses/i2c-sh7760.c 10 * (c) 2005-2008 MSC Vertriebsges.m.b.H, Manuel Lauss <mlau@msc-ge.com> 11 * 12 * This file used out-of-tree driver i2c-rcar.c 13 * Copyright (C) 2011-2012 Renesas Electronics Corporation 14 * 15 * This program is free software; you can redistribute it and/or modify 16 * it under the terms of the GNU General Public License as published by 17 * the Free Software Foundation; version 2 of the License. 18 * 19 * This program is distributed in the hope that it will be useful, 20 * but WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 * GNU General Public License for more details. 23 */ 24 #include <linux/clk.h> 25 #include <linux/delay.h> 26 #include <linux/err.h> 27 #include <linux/interrupt.h> 28 #include <linux/io.h> 29 #include <linux/i2c.h> 30 #include <linux/i2c/i2c-rcar.h> 31 #include <linux/kernel.h> 32 #include <linux/module.h> 33 #include <linux/of_device.h> 34 #include <linux/platform_device.h> 35 #include <linux/pm_runtime.h> 36 #include <linux/slab.h> 37 #include <linux/spinlock.h> 38 39 /* register offsets */ 40 #define ICSCR 0x00 /* slave ctrl */ 41 #define ICMCR 0x04 /* master ctrl */ 42 #define ICSSR 0x08 /* slave status */ 43 #define ICMSR 0x0C /* master status */ 44 #define ICSIER 0x10 /* slave irq enable */ 45 #define ICMIER 0x14 /* master irq enable */ 46 #define ICCCR 0x18 /* clock dividers */ 47 #define ICSAR 0x1C /* slave address */ 48 #define ICMAR 0x20 /* master address */ 49 #define ICRXTX 0x24 /* data port */ 50 51 /* ICSCR */ 52 #define SDBS (1 << 3) /* slave data buffer select */ 53 #define SIE (1 << 2) /* slave interface enable */ 54 #define GCAE (1 << 1) /* general call address enable */ 55 #define FNA (1 << 0) /* forced non acknowledgment */ 56 57 /* ICMCR */ 58 #define MDBS (1 << 7) /* non-fifo mode switch */ 59 #define FSCL (1 << 6) /* override SCL pin */ 60 #define FSDA (1 << 5) /* override SDA pin */ 61 #define OBPC (1 << 4) /* override pins */ 62 #define MIE (1 << 3) /* master if enable */ 63 #define TSBE (1 << 2) 64 #define FSB (1 << 1) /* force stop bit */ 65 #define ESG (1 << 0) /* en startbit gen */ 66 67 /* ICSSR (also for ICSIER) */ 68 #define GCAR (1 << 6) /* general call received */ 69 #define STM (1 << 5) /* slave transmit mode */ 70 #define SSR (1 << 4) /* stop received */ 71 #define SDE (1 << 3) /* slave data empty */ 72 #define SDT (1 << 2) /* slave data transmitted */ 73 #define SDR (1 << 1) /* slave data received */ 74 #define SAR (1 << 0) /* slave addr received */ 75 76 /* ICMSR (also for ICMIE) */ 77 #define MNR (1 << 6) /* nack received */ 78 #define MAL (1 << 5) /* arbitration lost */ 79 #define MST (1 << 4) /* sent a stop */ 80 #define MDE (1 << 3) 81 #define MDT (1 << 2) 82 #define MDR (1 << 1) 83 #define MAT (1 << 0) /* slave addr xfer done */ 84 85 86 #define RCAR_BUS_PHASE_START (MDBS | MIE | ESG) 87 #define RCAR_BUS_PHASE_DATA (MDBS | MIE) 88 #define RCAR_BUS_PHASE_STOP (MDBS | MIE | FSB) 89 90 #define RCAR_IRQ_SEND (MNR | MAL | MST | MAT | MDE) 91 #define RCAR_IRQ_RECV (MNR | MAL | MST | MAT | MDR) 92 #define RCAR_IRQ_STOP (MST) 93 94 #define RCAR_IRQ_ACK_SEND (~(MAT | MDE) & 0xFF) 95 #define RCAR_IRQ_ACK_RECV (~(MAT | MDR) & 0xFF) 96 97 #define ID_LAST_MSG (1 << 0) 98 #define ID_IOERROR (1 << 1) 99 #define ID_DONE (1 << 2) 100 #define ID_ARBLOST (1 << 3) 101 #define ID_NACK (1 << 4) 102 103 enum rcar_i2c_type { 104 I2C_RCAR_GEN1, 105 I2C_RCAR_GEN2, 106 }; 107 108 struct rcar_i2c_priv { 109 void __iomem *io; 110 struct i2c_adapter adap; 111 struct i2c_msg *msg; 112 struct clk *clk; 113 114 spinlock_t lock; 115 wait_queue_head_t wait; 116 117 int pos; 118 u32 icccr; 119 u32 flags; 120 enum rcar_i2c_type devtype; 121 struct i2c_client *slave; 122 }; 123 124 #define rcar_i2c_priv_to_dev(p) ((p)->adap.dev.parent) 125 #define rcar_i2c_is_recv(p) ((p)->msg->flags & I2C_M_RD) 126 127 #define rcar_i2c_flags_set(p, f) ((p)->flags |= (f)) 128 #define rcar_i2c_flags_has(p, f) ((p)->flags & (f)) 129 130 #define LOOP_TIMEOUT 1024 131 132 133 static void rcar_i2c_write(struct rcar_i2c_priv *priv, int reg, u32 val) 134 { 135 writel(val, priv->io + reg); 136 } 137 138 static u32 rcar_i2c_read(struct rcar_i2c_priv *priv, int reg) 139 { 140 return readl(priv->io + reg); 141 } 142 143 static void rcar_i2c_init(struct rcar_i2c_priv *priv) 144 { 145 /* reset master mode */ 146 rcar_i2c_write(priv, ICMIER, 0); 147 rcar_i2c_write(priv, ICMCR, 0); 148 rcar_i2c_write(priv, ICMSR, 0); 149 rcar_i2c_write(priv, ICMAR, 0); 150 } 151 152 static int rcar_i2c_bus_barrier(struct rcar_i2c_priv *priv) 153 { 154 int i; 155 156 for (i = 0; i < LOOP_TIMEOUT; i++) { 157 /* make sure that bus is not busy */ 158 if (!(rcar_i2c_read(priv, ICMCR) & FSDA)) 159 return 0; 160 udelay(1); 161 } 162 163 return -EBUSY; 164 } 165 166 static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv, 167 u32 bus_speed, 168 struct device *dev) 169 { 170 u32 scgd, cdf; 171 u32 round, ick; 172 u32 scl; 173 u32 cdf_width; 174 unsigned long rate; 175 176 switch (priv->devtype) { 177 case I2C_RCAR_GEN1: 178 cdf_width = 2; 179 break; 180 case I2C_RCAR_GEN2: 181 cdf_width = 3; 182 break; 183 default: 184 dev_err(dev, "device type error\n"); 185 return -EIO; 186 } 187 188 /* 189 * calculate SCL clock 190 * see 191 * ICCCR 192 * 193 * ick = clkp / (1 + CDF) 194 * SCL = ick / (20 + SCGD * 8 + F[(ticf + tr + intd) * ick]) 195 * 196 * ick : I2C internal clock < 20 MHz 197 * ticf : I2C SCL falling time = 35 ns here 198 * tr : I2C SCL rising time = 200 ns here 199 * intd : LSI internal delay = 50 ns here 200 * clkp : peripheral_clk 201 * F[] : integer up-valuation 202 */ 203 rate = clk_get_rate(priv->clk); 204 cdf = rate / 20000000; 205 if (cdf >= 1U << cdf_width) { 206 dev_err(dev, "Input clock %lu too high\n", rate); 207 return -EIO; 208 } 209 ick = rate / (cdf + 1); 210 211 /* 212 * it is impossible to calculate large scale 213 * number on u32. separate it 214 * 215 * F[(ticf + tr + intd) * ick] 216 * = F[(35 + 200 + 50)ns * ick] 217 * = F[285 * ick / 1000000000] 218 * = F[(ick / 1000000) * 285 / 1000] 219 */ 220 round = (ick + 500000) / 1000000 * 285; 221 round = (round + 500) / 1000; 222 223 /* 224 * SCL = ick / (20 + SCGD * 8 + F[(ticf + tr + intd) * ick]) 225 * 226 * Calculation result (= SCL) should be less than 227 * bus_speed for hardware safety 228 * 229 * We could use something along the lines of 230 * div = ick / (bus_speed + 1) + 1; 231 * scgd = (div - 20 - round + 7) / 8; 232 * scl = ick / (20 + (scgd * 8) + round); 233 * (not fully verified) but that would get pretty involved 234 */ 235 for (scgd = 0; scgd < 0x40; scgd++) { 236 scl = ick / (20 + (scgd * 8) + round); 237 if (scl <= bus_speed) 238 goto scgd_find; 239 } 240 dev_err(dev, "it is impossible to calculate best SCL\n"); 241 return -EIO; 242 243 scgd_find: 244 dev_dbg(dev, "clk %d/%d(%lu), round %u, CDF:0x%x, SCGD: 0x%x\n", 245 scl, bus_speed, clk_get_rate(priv->clk), round, cdf, scgd); 246 247 /* 248 * keep icccr value 249 */ 250 priv->icccr = scgd << cdf_width | cdf; 251 252 return 0; 253 } 254 255 static void rcar_i2c_prepare_msg(struct rcar_i2c_priv *priv) 256 { 257 int read = !!rcar_i2c_is_recv(priv); 258 259 rcar_i2c_write(priv, ICMAR, (priv->msg->addr << 1) | read); 260 rcar_i2c_write(priv, ICMSR, 0); 261 rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_START); 262 rcar_i2c_write(priv, ICMIER, read ? RCAR_IRQ_RECV : RCAR_IRQ_SEND); 263 } 264 265 /* 266 * interrupt functions 267 */ 268 static int rcar_i2c_irq_send(struct rcar_i2c_priv *priv, u32 msr) 269 { 270 struct i2c_msg *msg = priv->msg; 271 272 /* 273 * FIXME 274 * sometimes, unknown interrupt happened. 275 * Do nothing 276 */ 277 if (!(msr & MDE)) 278 return 0; 279 280 /* 281 * If address transfer phase finished, 282 * goto data phase. 283 */ 284 if (msr & MAT) 285 rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_DATA); 286 287 if (priv->pos < msg->len) { 288 /* 289 * Prepare next data to ICRXTX register. 290 * This data will go to _SHIFT_ register. 291 * 292 * * 293 * [ICRXTX] -> [SHIFT] -> [I2C bus] 294 */ 295 rcar_i2c_write(priv, ICRXTX, msg->buf[priv->pos]); 296 priv->pos++; 297 298 } else { 299 /* 300 * The last data was pushed to ICRXTX on _PREV_ empty irq. 301 * It is on _SHIFT_ register, and will sent to I2C bus. 302 * 303 * * 304 * [ICRXTX] -> [SHIFT] -> [I2C bus] 305 */ 306 307 if (priv->flags & ID_LAST_MSG) 308 /* 309 * If current msg is the _LAST_ msg, 310 * prepare stop condition here. 311 * ID_DONE will be set on STOP irq. 312 */ 313 rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP); 314 else 315 /* 316 * If current msg is _NOT_ last msg, 317 * it doesn't call stop phase. 318 * thus, there is no STOP irq. 319 * return ID_DONE here. 320 */ 321 return ID_DONE; 322 } 323 324 rcar_i2c_write(priv, ICMSR, RCAR_IRQ_ACK_SEND); 325 326 return 0; 327 } 328 329 static int rcar_i2c_irq_recv(struct rcar_i2c_priv *priv, u32 msr) 330 { 331 struct i2c_msg *msg = priv->msg; 332 333 /* 334 * FIXME 335 * sometimes, unknown interrupt happened. 336 * Do nothing 337 */ 338 if (!(msr & MDR)) 339 return 0; 340 341 if (msr & MAT) { 342 /* 343 * Address transfer phase finished, 344 * but, there is no data at this point. 345 * Do nothing. 346 */ 347 } else if (priv->pos < msg->len) { 348 /* 349 * get received data 350 */ 351 msg->buf[priv->pos] = rcar_i2c_read(priv, ICRXTX); 352 priv->pos++; 353 } 354 355 /* 356 * If next received data is the _LAST_, 357 * go to STOP phase, 358 * otherwise, go to DATA phase. 359 */ 360 if (priv->pos + 1 >= msg->len) 361 rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP); 362 else 363 rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_DATA); 364 365 rcar_i2c_write(priv, ICMSR, RCAR_IRQ_ACK_RECV); 366 367 return 0; 368 } 369 370 static bool rcar_i2c_slave_irq(struct rcar_i2c_priv *priv) 371 { 372 u32 ssr_raw, ssr_filtered; 373 u8 value; 374 375 ssr_raw = rcar_i2c_read(priv, ICSSR) & 0xff; 376 ssr_filtered = ssr_raw & rcar_i2c_read(priv, ICSIER); 377 378 if (!ssr_filtered) 379 return false; 380 381 /* address detected */ 382 if (ssr_filtered & SAR) { 383 /* read or write request */ 384 if (ssr_raw & STM) { 385 i2c_slave_event(priv->slave, I2C_SLAVE_READ_REQUESTED, &value); 386 rcar_i2c_write(priv, ICRXTX, value); 387 rcar_i2c_write(priv, ICSIER, SDE | SSR | SAR); 388 } else { 389 i2c_slave_event(priv->slave, I2C_SLAVE_WRITE_REQUESTED, &value); 390 rcar_i2c_read(priv, ICRXTX); /* dummy read */ 391 rcar_i2c_write(priv, ICSIER, SDR | SSR | SAR); 392 } 393 394 rcar_i2c_write(priv, ICSSR, ~SAR & 0xff); 395 } 396 397 /* master sent stop */ 398 if (ssr_filtered & SSR) { 399 i2c_slave_event(priv->slave, I2C_SLAVE_STOP, &value); 400 rcar_i2c_write(priv, ICSIER, SAR | SSR); 401 rcar_i2c_write(priv, ICSSR, ~SSR & 0xff); 402 } 403 404 /* master wants to write to us */ 405 if (ssr_filtered & SDR) { 406 int ret; 407 408 value = rcar_i2c_read(priv, ICRXTX); 409 ret = i2c_slave_event(priv->slave, I2C_SLAVE_WRITE_RECEIVED, &value); 410 /* Send NACK in case of error */ 411 rcar_i2c_write(priv, ICSCR, SIE | SDBS | (ret < 0 ? FNA : 0)); 412 rcar_i2c_write(priv, ICSSR, ~SDR & 0xff); 413 } 414 415 /* master wants to read from us */ 416 if (ssr_filtered & SDE) { 417 i2c_slave_event(priv->slave, I2C_SLAVE_READ_PROCESSED, &value); 418 rcar_i2c_write(priv, ICRXTX, value); 419 rcar_i2c_write(priv, ICSSR, ~SDE & 0xff); 420 } 421 422 return true; 423 } 424 425 static irqreturn_t rcar_i2c_irq(int irq, void *ptr) 426 { 427 struct rcar_i2c_priv *priv = ptr; 428 irqreturn_t result = IRQ_HANDLED; 429 u32 msr; 430 431 /*-------------- spin lock -----------------*/ 432 spin_lock(&priv->lock); 433 434 if (rcar_i2c_slave_irq(priv)) 435 goto exit; 436 437 msr = rcar_i2c_read(priv, ICMSR); 438 439 /* Only handle interrupts that are currently enabled */ 440 msr &= rcar_i2c_read(priv, ICMIER); 441 if (!msr) { 442 result = IRQ_NONE; 443 goto exit; 444 } 445 446 /* Arbitration lost */ 447 if (msr & MAL) { 448 rcar_i2c_flags_set(priv, (ID_DONE | ID_ARBLOST)); 449 goto out; 450 } 451 452 /* Nack */ 453 if (msr & MNR) { 454 /* go to stop phase */ 455 rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP); 456 rcar_i2c_write(priv, ICMIER, RCAR_IRQ_STOP); 457 rcar_i2c_flags_set(priv, ID_NACK); 458 goto out; 459 } 460 461 /* Stop */ 462 if (msr & MST) { 463 rcar_i2c_flags_set(priv, ID_DONE); 464 goto out; 465 } 466 467 if (rcar_i2c_is_recv(priv)) 468 rcar_i2c_flags_set(priv, rcar_i2c_irq_recv(priv, msr)); 469 else 470 rcar_i2c_flags_set(priv, rcar_i2c_irq_send(priv, msr)); 471 472 out: 473 if (rcar_i2c_flags_has(priv, ID_DONE)) { 474 rcar_i2c_write(priv, ICMIER, 0); 475 rcar_i2c_write(priv, ICMSR, 0); 476 wake_up(&priv->wait); 477 } 478 479 exit: 480 spin_unlock(&priv->lock); 481 /*-------------- spin unlock -----------------*/ 482 483 return result; 484 } 485 486 static int rcar_i2c_master_xfer(struct i2c_adapter *adap, 487 struct i2c_msg *msgs, 488 int num) 489 { 490 struct rcar_i2c_priv *priv = i2c_get_adapdata(adap); 491 struct device *dev = rcar_i2c_priv_to_dev(priv); 492 unsigned long flags; 493 int i, ret, timeout; 494 495 pm_runtime_get_sync(dev); 496 497 /*-------------- spin lock -----------------*/ 498 spin_lock_irqsave(&priv->lock, flags); 499 500 rcar_i2c_init(priv); 501 /* start clock */ 502 rcar_i2c_write(priv, ICCCR, priv->icccr); 503 504 spin_unlock_irqrestore(&priv->lock, flags); 505 /*-------------- spin unlock -----------------*/ 506 507 ret = rcar_i2c_bus_barrier(priv); 508 if (ret < 0) 509 goto out; 510 511 for (i = 0; i < num; i++) { 512 /* This HW can't send STOP after address phase */ 513 if (msgs[i].len == 0) { 514 ret = -EOPNOTSUPP; 515 break; 516 } 517 518 /*-------------- spin lock -----------------*/ 519 spin_lock_irqsave(&priv->lock, flags); 520 521 /* init each data */ 522 priv->msg = &msgs[i]; 523 priv->pos = 0; 524 priv->flags = 0; 525 if (i == num - 1) 526 rcar_i2c_flags_set(priv, ID_LAST_MSG); 527 528 rcar_i2c_prepare_msg(priv); 529 530 spin_unlock_irqrestore(&priv->lock, flags); 531 /*-------------- spin unlock -----------------*/ 532 533 timeout = wait_event_timeout(priv->wait, 534 rcar_i2c_flags_has(priv, ID_DONE), 535 5 * HZ); 536 if (!timeout) { 537 ret = -ETIMEDOUT; 538 break; 539 } 540 541 if (rcar_i2c_flags_has(priv, ID_NACK)) { 542 ret = -ENXIO; 543 break; 544 } 545 546 if (rcar_i2c_flags_has(priv, ID_ARBLOST)) { 547 ret = -EAGAIN; 548 break; 549 } 550 551 if (rcar_i2c_flags_has(priv, ID_IOERROR)) { 552 ret = -EIO; 553 break; 554 } 555 556 ret = i + 1; /* The number of transfer */ 557 } 558 out: 559 pm_runtime_put(dev); 560 561 if (ret < 0 && ret != -ENXIO) 562 dev_err(dev, "error %d : %x\n", ret, priv->flags); 563 564 return ret; 565 } 566 567 static int rcar_reg_slave(struct i2c_client *slave) 568 { 569 struct rcar_i2c_priv *priv = i2c_get_adapdata(slave->adapter); 570 571 if (priv->slave) 572 return -EBUSY; 573 574 if (slave->flags & I2C_CLIENT_TEN) 575 return -EAFNOSUPPORT; 576 577 pm_runtime_forbid(rcar_i2c_priv_to_dev(priv)); 578 579 priv->slave = slave; 580 rcar_i2c_write(priv, ICSAR, slave->addr); 581 rcar_i2c_write(priv, ICSSR, 0); 582 rcar_i2c_write(priv, ICSIER, SAR | SSR); 583 rcar_i2c_write(priv, ICSCR, SIE | SDBS); 584 585 return 0; 586 } 587 588 static int rcar_unreg_slave(struct i2c_client *slave) 589 { 590 struct rcar_i2c_priv *priv = i2c_get_adapdata(slave->adapter); 591 592 WARN_ON(!priv->slave); 593 594 rcar_i2c_write(priv, ICSIER, 0); 595 rcar_i2c_write(priv, ICSCR, 0); 596 597 priv->slave = NULL; 598 599 pm_runtime_allow(rcar_i2c_priv_to_dev(priv)); 600 601 return 0; 602 } 603 604 static u32 rcar_i2c_func(struct i2c_adapter *adap) 605 { 606 /* This HW can't do SMBUS_QUICK and NOSTART */ 607 return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK); 608 } 609 610 static const struct i2c_algorithm rcar_i2c_algo = { 611 .master_xfer = rcar_i2c_master_xfer, 612 .functionality = rcar_i2c_func, 613 .reg_slave = rcar_reg_slave, 614 .unreg_slave = rcar_unreg_slave, 615 }; 616 617 static const struct of_device_id rcar_i2c_dt_ids[] = { 618 { .compatible = "renesas,i2c-rcar", .data = (void *)I2C_RCAR_GEN1 }, 619 { .compatible = "renesas,i2c-r8a7778", .data = (void *)I2C_RCAR_GEN1 }, 620 { .compatible = "renesas,i2c-r8a7779", .data = (void *)I2C_RCAR_GEN1 }, 621 { .compatible = "renesas,i2c-r8a7790", .data = (void *)I2C_RCAR_GEN2 }, 622 { .compatible = "renesas,i2c-r8a7791", .data = (void *)I2C_RCAR_GEN2 }, 623 { .compatible = "renesas,i2c-r8a7792", .data = (void *)I2C_RCAR_GEN2 }, 624 { .compatible = "renesas,i2c-r8a7793", .data = (void *)I2C_RCAR_GEN2 }, 625 { .compatible = "renesas,i2c-r8a7794", .data = (void *)I2C_RCAR_GEN2 }, 626 {}, 627 }; 628 MODULE_DEVICE_TABLE(of, rcar_i2c_dt_ids); 629 630 static int rcar_i2c_probe(struct platform_device *pdev) 631 { 632 struct i2c_rcar_platform_data *pdata = dev_get_platdata(&pdev->dev); 633 struct rcar_i2c_priv *priv; 634 struct i2c_adapter *adap; 635 struct resource *res; 636 struct device *dev = &pdev->dev; 637 u32 bus_speed; 638 int irq, ret; 639 640 priv = devm_kzalloc(dev, sizeof(struct rcar_i2c_priv), GFP_KERNEL); 641 if (!priv) 642 return -ENOMEM; 643 644 priv->clk = devm_clk_get(dev, NULL); 645 if (IS_ERR(priv->clk)) { 646 dev_err(dev, "cannot get clock\n"); 647 return PTR_ERR(priv->clk); 648 } 649 650 bus_speed = 100000; /* default 100 kHz */ 651 ret = of_property_read_u32(dev->of_node, "clock-frequency", &bus_speed); 652 if (ret < 0 && pdata && pdata->bus_speed) 653 bus_speed = pdata->bus_speed; 654 655 if (pdev->dev.of_node) 656 priv->devtype = (long)of_match_device(rcar_i2c_dt_ids, 657 dev)->data; 658 else 659 priv->devtype = platform_get_device_id(pdev)->driver_data; 660 661 ret = rcar_i2c_clock_calculate(priv, bus_speed, dev); 662 if (ret < 0) 663 return ret; 664 665 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 666 priv->io = devm_ioremap_resource(dev, res); 667 if (IS_ERR(priv->io)) 668 return PTR_ERR(priv->io); 669 670 irq = platform_get_irq(pdev, 0); 671 init_waitqueue_head(&priv->wait); 672 spin_lock_init(&priv->lock); 673 674 adap = &priv->adap; 675 adap->nr = pdev->id; 676 adap->algo = &rcar_i2c_algo; 677 adap->class = I2C_CLASS_DEPRECATED; 678 adap->retries = 3; 679 adap->dev.parent = dev; 680 adap->dev.of_node = dev->of_node; 681 i2c_set_adapdata(adap, priv); 682 strlcpy(adap->name, pdev->name, sizeof(adap->name)); 683 684 ret = devm_request_irq(dev, irq, rcar_i2c_irq, 0, 685 dev_name(dev), priv); 686 if (ret < 0) { 687 dev_err(dev, "cannot get irq %d\n", irq); 688 return ret; 689 } 690 691 ret = i2c_add_numbered_adapter(adap); 692 if (ret < 0) { 693 dev_err(dev, "reg adap failed: %d\n", ret); 694 return ret; 695 } 696 697 pm_runtime_enable(dev); 698 platform_set_drvdata(pdev, priv); 699 700 dev_info(dev, "probed\n"); 701 702 return 0; 703 } 704 705 static int rcar_i2c_remove(struct platform_device *pdev) 706 { 707 struct rcar_i2c_priv *priv = platform_get_drvdata(pdev); 708 struct device *dev = &pdev->dev; 709 710 i2c_del_adapter(&priv->adap); 711 pm_runtime_disable(dev); 712 713 return 0; 714 } 715 716 static struct platform_device_id rcar_i2c_id_table[] = { 717 { "i2c-rcar", I2C_RCAR_GEN1 }, 718 { "i2c-rcar_gen1", I2C_RCAR_GEN1 }, 719 { "i2c-rcar_gen2", I2C_RCAR_GEN2 }, 720 {}, 721 }; 722 MODULE_DEVICE_TABLE(platform, rcar_i2c_id_table); 723 724 static struct platform_driver rcar_i2c_driver = { 725 .driver = { 726 .name = "i2c-rcar", 727 .of_match_table = rcar_i2c_dt_ids, 728 }, 729 .probe = rcar_i2c_probe, 730 .remove = rcar_i2c_remove, 731 .id_table = rcar_i2c_id_table, 732 }; 733 734 module_platform_driver(rcar_i2c_driver); 735 736 MODULE_LICENSE("GPL v2"); 737 MODULE_DESCRIPTION("Renesas R-Car I2C bus driver"); 738 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); 739