1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * This is i.MX low power i2c controller driver. 4 * 5 * Copyright 2016 Freescale Semiconductor, Inc. 6 */ 7 8 #include <linux/clk.h> 9 #include <linux/completion.h> 10 #include <linux/delay.h> 11 #include <linux/err.h> 12 #include <linux/errno.h> 13 #include <linux/i2c.h> 14 #include <linux/init.h> 15 #include <linux/interrupt.h> 16 #include <linux/io.h> 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/of.h> 20 #include <linux/pinctrl/consumer.h> 21 #include <linux/platform_device.h> 22 #include <linux/pm_runtime.h> 23 #include <linux/sched.h> 24 #include <linux/slab.h> 25 26 #define DRIVER_NAME "imx-lpi2c" 27 28 #define LPI2C_PARAM 0x04 /* i2c RX/TX FIFO size */ 29 #define LPI2C_MCR 0x10 /* i2c contrl register */ 30 #define LPI2C_MSR 0x14 /* i2c status register */ 31 #define LPI2C_MIER 0x18 /* i2c interrupt enable */ 32 #define LPI2C_MCFGR0 0x20 /* i2c master configuration */ 33 #define LPI2C_MCFGR1 0x24 /* i2c master configuration */ 34 #define LPI2C_MCFGR2 0x28 /* i2c master configuration */ 35 #define LPI2C_MCFGR3 0x2C /* i2c master configuration */ 36 #define LPI2C_MCCR0 0x48 /* i2c master clk configuration */ 37 #define LPI2C_MCCR1 0x50 /* i2c master clk configuration */ 38 #define LPI2C_MFCR 0x58 /* i2c master FIFO control */ 39 #define LPI2C_MFSR 0x5C /* i2c master FIFO status */ 40 #define LPI2C_MTDR 0x60 /* i2c master TX data register */ 41 #define LPI2C_MRDR 0x70 /* i2c master RX data register */ 42 43 /* i2c command */ 44 #define TRAN_DATA 0X00 45 #define RECV_DATA 0X01 46 #define GEN_STOP 0X02 47 #define RECV_DISCARD 0X03 48 #define GEN_START 0X04 49 #define START_NACK 0X05 50 #define START_HIGH 0X06 51 #define START_HIGH_NACK 0X07 52 53 #define MCR_MEN BIT(0) 54 #define MCR_RST BIT(1) 55 #define MCR_DOZEN BIT(2) 56 #define MCR_DBGEN BIT(3) 57 #define MCR_RTF BIT(8) 58 #define MCR_RRF BIT(9) 59 #define MSR_TDF BIT(0) 60 #define MSR_RDF BIT(1) 61 #define MSR_SDF BIT(9) 62 #define MSR_NDF BIT(10) 63 #define MSR_ALF BIT(11) 64 #define MSR_MBF BIT(24) 65 #define MSR_BBF BIT(25) 66 #define MIER_TDIE BIT(0) 67 #define MIER_RDIE BIT(1) 68 #define MIER_SDIE BIT(9) 69 #define MIER_NDIE BIT(10) 70 #define MCFGR1_AUTOSTOP BIT(8) 71 #define MCFGR1_IGNACK BIT(9) 72 #define MRDR_RXEMPTY BIT(14) 73 74 #define I2C_CLK_RATIO 2 75 #define CHUNK_DATA 256 76 77 #define I2C_PM_TIMEOUT 10 /* ms */ 78 79 enum lpi2c_imx_mode { 80 STANDARD, /* 100+Kbps */ 81 FAST, /* 400+Kbps */ 82 FAST_PLUS, /* 1.0+Mbps */ 83 HS, /* 3.4+Mbps */ 84 ULTRA_FAST, /* 5.0+Mbps */ 85 }; 86 87 enum lpi2c_imx_pincfg { 88 TWO_PIN_OD, 89 TWO_PIN_OO, 90 TWO_PIN_PP, 91 FOUR_PIN_PP, 92 }; 93 94 struct lpi2c_imx_struct { 95 struct i2c_adapter adapter; 96 int num_clks; 97 struct clk_bulk_data *clks; 98 void __iomem *base; 99 __u8 *rx_buf; 100 __u8 *tx_buf; 101 struct completion complete; 102 unsigned long rate_per; 103 unsigned int msglen; 104 unsigned int delivered; 105 unsigned int block_data; 106 unsigned int bitrate; 107 unsigned int txfifosize; 108 unsigned int rxfifosize; 109 enum lpi2c_imx_mode mode; 110 struct i2c_bus_recovery_info rinfo; 111 }; 112 113 static void lpi2c_imx_intctrl(struct lpi2c_imx_struct *lpi2c_imx, 114 unsigned int enable) 115 { 116 writel(enable, lpi2c_imx->base + LPI2C_MIER); 117 } 118 119 static int lpi2c_imx_bus_busy(struct lpi2c_imx_struct *lpi2c_imx) 120 { 121 unsigned long orig_jiffies = jiffies; 122 unsigned int temp; 123 124 while (1) { 125 temp = readl(lpi2c_imx->base + LPI2C_MSR); 126 127 /* check for arbitration lost, clear if set */ 128 if (temp & MSR_ALF) { 129 writel(temp, lpi2c_imx->base + LPI2C_MSR); 130 return -EAGAIN; 131 } 132 133 if (temp & (MSR_BBF | MSR_MBF)) 134 break; 135 136 if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) { 137 dev_dbg(&lpi2c_imx->adapter.dev, "bus not work\n"); 138 if (lpi2c_imx->adapter.bus_recovery_info) 139 i2c_recover_bus(&lpi2c_imx->adapter); 140 return -ETIMEDOUT; 141 } 142 schedule(); 143 } 144 145 return 0; 146 } 147 148 static void lpi2c_imx_set_mode(struct lpi2c_imx_struct *lpi2c_imx) 149 { 150 unsigned int bitrate = lpi2c_imx->bitrate; 151 enum lpi2c_imx_mode mode; 152 153 if (bitrate < I2C_MAX_FAST_MODE_FREQ) 154 mode = STANDARD; 155 else if (bitrate < I2C_MAX_FAST_MODE_PLUS_FREQ) 156 mode = FAST; 157 else if (bitrate < I2C_MAX_HIGH_SPEED_MODE_FREQ) 158 mode = FAST_PLUS; 159 else if (bitrate < I2C_MAX_ULTRA_FAST_MODE_FREQ) 160 mode = HS; 161 else 162 mode = ULTRA_FAST; 163 164 lpi2c_imx->mode = mode; 165 } 166 167 static int lpi2c_imx_start(struct lpi2c_imx_struct *lpi2c_imx, 168 struct i2c_msg *msgs) 169 { 170 unsigned int temp; 171 172 temp = readl(lpi2c_imx->base + LPI2C_MCR); 173 temp |= MCR_RRF | MCR_RTF; 174 writel(temp, lpi2c_imx->base + LPI2C_MCR); 175 writel(0x7f00, lpi2c_imx->base + LPI2C_MSR); 176 177 temp = i2c_8bit_addr_from_msg(msgs) | (GEN_START << 8); 178 writel(temp, lpi2c_imx->base + LPI2C_MTDR); 179 180 return lpi2c_imx_bus_busy(lpi2c_imx); 181 } 182 183 static void lpi2c_imx_stop(struct lpi2c_imx_struct *lpi2c_imx) 184 { 185 unsigned long orig_jiffies = jiffies; 186 unsigned int temp; 187 188 writel(GEN_STOP << 8, lpi2c_imx->base + LPI2C_MTDR); 189 190 do { 191 temp = readl(lpi2c_imx->base + LPI2C_MSR); 192 if (temp & MSR_SDF) 193 break; 194 195 if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) { 196 dev_dbg(&lpi2c_imx->adapter.dev, "stop timeout\n"); 197 if (lpi2c_imx->adapter.bus_recovery_info) 198 i2c_recover_bus(&lpi2c_imx->adapter); 199 break; 200 } 201 schedule(); 202 203 } while (1); 204 } 205 206 /* CLKLO = I2C_CLK_RATIO * CLKHI, SETHOLD = CLKHI, DATAVD = CLKHI/2 */ 207 static int lpi2c_imx_config(struct lpi2c_imx_struct *lpi2c_imx) 208 { 209 u8 prescale, filt, sethold, datavd; 210 unsigned int clk_rate, clk_cycle, clkhi, clklo; 211 enum lpi2c_imx_pincfg pincfg; 212 unsigned int temp; 213 214 lpi2c_imx_set_mode(lpi2c_imx); 215 216 clk_rate = lpi2c_imx->rate_per; 217 218 if (lpi2c_imx->mode == HS || lpi2c_imx->mode == ULTRA_FAST) 219 filt = 0; 220 else 221 filt = 2; 222 223 for (prescale = 0; prescale <= 7; prescale++) { 224 clk_cycle = clk_rate / ((1 << prescale) * lpi2c_imx->bitrate) 225 - 3 - (filt >> 1); 226 clkhi = DIV_ROUND_UP(clk_cycle, I2C_CLK_RATIO + 1); 227 clklo = clk_cycle - clkhi; 228 if (clklo < 64) 229 break; 230 } 231 232 if (prescale > 7) 233 return -EINVAL; 234 235 /* set MCFGR1: PINCFG, PRESCALE, IGNACK */ 236 if (lpi2c_imx->mode == ULTRA_FAST) 237 pincfg = TWO_PIN_OO; 238 else 239 pincfg = TWO_PIN_OD; 240 temp = prescale | pincfg << 24; 241 242 if (lpi2c_imx->mode == ULTRA_FAST) 243 temp |= MCFGR1_IGNACK; 244 245 writel(temp, lpi2c_imx->base + LPI2C_MCFGR1); 246 247 /* set MCFGR2: FILTSDA, FILTSCL */ 248 temp = (filt << 16) | (filt << 24); 249 writel(temp, lpi2c_imx->base + LPI2C_MCFGR2); 250 251 /* set MCCR: DATAVD, SETHOLD, CLKHI, CLKLO */ 252 sethold = clkhi; 253 datavd = clkhi >> 1; 254 temp = datavd << 24 | sethold << 16 | clkhi << 8 | clklo; 255 256 if (lpi2c_imx->mode == HS) 257 writel(temp, lpi2c_imx->base + LPI2C_MCCR1); 258 else 259 writel(temp, lpi2c_imx->base + LPI2C_MCCR0); 260 261 return 0; 262 } 263 264 static int lpi2c_imx_master_enable(struct lpi2c_imx_struct *lpi2c_imx) 265 { 266 unsigned int temp; 267 int ret; 268 269 ret = pm_runtime_resume_and_get(lpi2c_imx->adapter.dev.parent); 270 if (ret < 0) 271 return ret; 272 273 temp = MCR_RST; 274 writel(temp, lpi2c_imx->base + LPI2C_MCR); 275 writel(0, lpi2c_imx->base + LPI2C_MCR); 276 277 ret = lpi2c_imx_config(lpi2c_imx); 278 if (ret) 279 goto rpm_put; 280 281 temp = readl(lpi2c_imx->base + LPI2C_MCR); 282 temp |= MCR_MEN; 283 writel(temp, lpi2c_imx->base + LPI2C_MCR); 284 285 return 0; 286 287 rpm_put: 288 pm_runtime_mark_last_busy(lpi2c_imx->adapter.dev.parent); 289 pm_runtime_put_autosuspend(lpi2c_imx->adapter.dev.parent); 290 291 return ret; 292 } 293 294 static int lpi2c_imx_master_disable(struct lpi2c_imx_struct *lpi2c_imx) 295 { 296 u32 temp; 297 298 temp = readl(lpi2c_imx->base + LPI2C_MCR); 299 temp &= ~MCR_MEN; 300 writel(temp, lpi2c_imx->base + LPI2C_MCR); 301 302 pm_runtime_mark_last_busy(lpi2c_imx->adapter.dev.parent); 303 pm_runtime_put_autosuspend(lpi2c_imx->adapter.dev.parent); 304 305 return 0; 306 } 307 308 static int lpi2c_imx_msg_complete(struct lpi2c_imx_struct *lpi2c_imx) 309 { 310 unsigned long time_left; 311 312 time_left = wait_for_completion_timeout(&lpi2c_imx->complete, HZ); 313 314 return time_left ? 0 : -ETIMEDOUT; 315 } 316 317 static int lpi2c_imx_txfifo_empty(struct lpi2c_imx_struct *lpi2c_imx) 318 { 319 unsigned long orig_jiffies = jiffies; 320 u32 txcnt; 321 322 do { 323 txcnt = readl(lpi2c_imx->base + LPI2C_MFSR) & 0xff; 324 325 if (readl(lpi2c_imx->base + LPI2C_MSR) & MSR_NDF) { 326 dev_dbg(&lpi2c_imx->adapter.dev, "NDF detected\n"); 327 return -EIO; 328 } 329 330 if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) { 331 dev_dbg(&lpi2c_imx->adapter.dev, "txfifo empty timeout\n"); 332 if (lpi2c_imx->adapter.bus_recovery_info) 333 i2c_recover_bus(&lpi2c_imx->adapter); 334 return -ETIMEDOUT; 335 } 336 schedule(); 337 338 } while (txcnt); 339 340 return 0; 341 } 342 343 static void lpi2c_imx_set_tx_watermark(struct lpi2c_imx_struct *lpi2c_imx) 344 { 345 writel(lpi2c_imx->txfifosize >> 1, lpi2c_imx->base + LPI2C_MFCR); 346 } 347 348 static void lpi2c_imx_set_rx_watermark(struct lpi2c_imx_struct *lpi2c_imx) 349 { 350 unsigned int temp, remaining; 351 352 remaining = lpi2c_imx->msglen - lpi2c_imx->delivered; 353 354 if (remaining > (lpi2c_imx->rxfifosize >> 1)) 355 temp = lpi2c_imx->rxfifosize >> 1; 356 else 357 temp = 0; 358 359 writel(temp << 16, lpi2c_imx->base + LPI2C_MFCR); 360 } 361 362 static void lpi2c_imx_write_txfifo(struct lpi2c_imx_struct *lpi2c_imx) 363 { 364 unsigned int data, txcnt; 365 366 txcnt = readl(lpi2c_imx->base + LPI2C_MFSR) & 0xff; 367 368 while (txcnt < lpi2c_imx->txfifosize) { 369 if (lpi2c_imx->delivered == lpi2c_imx->msglen) 370 break; 371 372 data = lpi2c_imx->tx_buf[lpi2c_imx->delivered++]; 373 writel(data, lpi2c_imx->base + LPI2C_MTDR); 374 txcnt++; 375 } 376 377 if (lpi2c_imx->delivered < lpi2c_imx->msglen) 378 lpi2c_imx_intctrl(lpi2c_imx, MIER_TDIE | MIER_NDIE); 379 else 380 complete(&lpi2c_imx->complete); 381 } 382 383 static void lpi2c_imx_read_rxfifo(struct lpi2c_imx_struct *lpi2c_imx) 384 { 385 unsigned int blocklen, remaining; 386 unsigned int temp, data; 387 388 do { 389 data = readl(lpi2c_imx->base + LPI2C_MRDR); 390 if (data & MRDR_RXEMPTY) 391 break; 392 393 lpi2c_imx->rx_buf[lpi2c_imx->delivered++] = data & 0xff; 394 } while (1); 395 396 /* 397 * First byte is the length of remaining packet in the SMBus block 398 * data read. Add it to msgs->len. 399 */ 400 if (lpi2c_imx->block_data) { 401 blocklen = lpi2c_imx->rx_buf[0]; 402 lpi2c_imx->msglen += blocklen; 403 } 404 405 remaining = lpi2c_imx->msglen - lpi2c_imx->delivered; 406 407 if (!remaining) { 408 complete(&lpi2c_imx->complete); 409 return; 410 } 411 412 /* not finished, still waiting for rx data */ 413 lpi2c_imx_set_rx_watermark(lpi2c_imx); 414 415 /* multiple receive commands */ 416 if (lpi2c_imx->block_data) { 417 lpi2c_imx->block_data = 0; 418 temp = remaining; 419 temp |= (RECV_DATA << 8); 420 writel(temp, lpi2c_imx->base + LPI2C_MTDR); 421 } else if (!(lpi2c_imx->delivered & 0xff)) { 422 temp = (remaining > CHUNK_DATA ? CHUNK_DATA : remaining) - 1; 423 temp |= (RECV_DATA << 8); 424 writel(temp, lpi2c_imx->base + LPI2C_MTDR); 425 } 426 427 lpi2c_imx_intctrl(lpi2c_imx, MIER_RDIE); 428 } 429 430 static void lpi2c_imx_write(struct lpi2c_imx_struct *lpi2c_imx, 431 struct i2c_msg *msgs) 432 { 433 lpi2c_imx->tx_buf = msgs->buf; 434 lpi2c_imx_set_tx_watermark(lpi2c_imx); 435 lpi2c_imx_write_txfifo(lpi2c_imx); 436 } 437 438 static void lpi2c_imx_read(struct lpi2c_imx_struct *lpi2c_imx, 439 struct i2c_msg *msgs) 440 { 441 unsigned int temp; 442 443 lpi2c_imx->rx_buf = msgs->buf; 444 lpi2c_imx->block_data = msgs->flags & I2C_M_RECV_LEN; 445 446 lpi2c_imx_set_rx_watermark(lpi2c_imx); 447 temp = msgs->len > CHUNK_DATA ? CHUNK_DATA - 1 : msgs->len - 1; 448 temp |= (RECV_DATA << 8); 449 writel(temp, lpi2c_imx->base + LPI2C_MTDR); 450 451 lpi2c_imx_intctrl(lpi2c_imx, MIER_RDIE | MIER_NDIE); 452 } 453 454 static int lpi2c_imx_xfer(struct i2c_adapter *adapter, 455 struct i2c_msg *msgs, int num) 456 { 457 struct lpi2c_imx_struct *lpi2c_imx = i2c_get_adapdata(adapter); 458 unsigned int temp; 459 int i, result; 460 461 result = lpi2c_imx_master_enable(lpi2c_imx); 462 if (result) 463 return result; 464 465 for (i = 0; i < num; i++) { 466 result = lpi2c_imx_start(lpi2c_imx, &msgs[i]); 467 if (result) 468 goto disable; 469 470 /* quick smbus */ 471 if (num == 1 && msgs[0].len == 0) 472 goto stop; 473 474 lpi2c_imx->rx_buf = NULL; 475 lpi2c_imx->tx_buf = NULL; 476 lpi2c_imx->delivered = 0; 477 lpi2c_imx->msglen = msgs[i].len; 478 init_completion(&lpi2c_imx->complete); 479 480 if (msgs[i].flags & I2C_M_RD) 481 lpi2c_imx_read(lpi2c_imx, &msgs[i]); 482 else 483 lpi2c_imx_write(lpi2c_imx, &msgs[i]); 484 485 result = lpi2c_imx_msg_complete(lpi2c_imx); 486 if (result) 487 goto stop; 488 489 if (!(msgs[i].flags & I2C_M_RD)) { 490 result = lpi2c_imx_txfifo_empty(lpi2c_imx); 491 if (result) 492 goto stop; 493 } 494 } 495 496 stop: 497 lpi2c_imx_stop(lpi2c_imx); 498 499 temp = readl(lpi2c_imx->base + LPI2C_MSR); 500 if ((temp & MSR_NDF) && !result) 501 result = -EIO; 502 503 disable: 504 lpi2c_imx_master_disable(lpi2c_imx); 505 506 dev_dbg(&lpi2c_imx->adapter.dev, "<%s> exit with: %s: %d\n", __func__, 507 (result < 0) ? "error" : "success msg", 508 (result < 0) ? result : num); 509 510 return (result < 0) ? result : num; 511 } 512 513 static irqreturn_t lpi2c_imx_isr(int irq, void *dev_id) 514 { 515 struct lpi2c_imx_struct *lpi2c_imx = dev_id; 516 unsigned int enabled; 517 unsigned int temp; 518 519 enabled = readl(lpi2c_imx->base + LPI2C_MIER); 520 521 lpi2c_imx_intctrl(lpi2c_imx, 0); 522 temp = readl(lpi2c_imx->base + LPI2C_MSR); 523 temp &= enabled; 524 525 if (temp & MSR_NDF) 526 complete(&lpi2c_imx->complete); 527 else if (temp & MSR_RDF) 528 lpi2c_imx_read_rxfifo(lpi2c_imx); 529 else if (temp & MSR_TDF) 530 lpi2c_imx_write_txfifo(lpi2c_imx); 531 532 return IRQ_HANDLED; 533 } 534 535 static int lpi2c_imx_init_recovery_info(struct lpi2c_imx_struct *lpi2c_imx, 536 struct platform_device *pdev) 537 { 538 struct i2c_bus_recovery_info *bri = &lpi2c_imx->rinfo; 539 540 bri->pinctrl = devm_pinctrl_get(&pdev->dev); 541 if (IS_ERR(bri->pinctrl)) 542 return PTR_ERR(bri->pinctrl); 543 544 lpi2c_imx->adapter.bus_recovery_info = bri; 545 546 return 0; 547 } 548 549 static u32 lpi2c_imx_func(struct i2c_adapter *adapter) 550 { 551 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | 552 I2C_FUNC_SMBUS_READ_BLOCK_DATA; 553 } 554 555 static const struct i2c_algorithm lpi2c_imx_algo = { 556 .master_xfer = lpi2c_imx_xfer, 557 .functionality = lpi2c_imx_func, 558 }; 559 560 static const struct of_device_id lpi2c_imx_of_match[] = { 561 { .compatible = "fsl,imx7ulp-lpi2c" }, 562 { }, 563 }; 564 MODULE_DEVICE_TABLE(of, lpi2c_imx_of_match); 565 566 static int lpi2c_imx_probe(struct platform_device *pdev) 567 { 568 struct lpi2c_imx_struct *lpi2c_imx; 569 unsigned int temp; 570 int irq, ret; 571 572 lpi2c_imx = devm_kzalloc(&pdev->dev, sizeof(*lpi2c_imx), GFP_KERNEL); 573 if (!lpi2c_imx) 574 return -ENOMEM; 575 576 lpi2c_imx->base = devm_platform_ioremap_resource(pdev, 0); 577 if (IS_ERR(lpi2c_imx->base)) 578 return PTR_ERR(lpi2c_imx->base); 579 580 irq = platform_get_irq(pdev, 0); 581 if (irq < 0) 582 return irq; 583 584 lpi2c_imx->adapter.owner = THIS_MODULE; 585 lpi2c_imx->adapter.algo = &lpi2c_imx_algo; 586 lpi2c_imx->adapter.dev.parent = &pdev->dev; 587 lpi2c_imx->adapter.dev.of_node = pdev->dev.of_node; 588 strscpy(lpi2c_imx->adapter.name, pdev->name, 589 sizeof(lpi2c_imx->adapter.name)); 590 591 ret = devm_clk_bulk_get_all(&pdev->dev, &lpi2c_imx->clks); 592 if (ret < 0) 593 return dev_err_probe(&pdev->dev, ret, "can't get I2C peripheral clock\n"); 594 lpi2c_imx->num_clks = ret; 595 596 ret = of_property_read_u32(pdev->dev.of_node, 597 "clock-frequency", &lpi2c_imx->bitrate); 598 if (ret) 599 lpi2c_imx->bitrate = I2C_MAX_STANDARD_MODE_FREQ; 600 601 ret = devm_request_irq(&pdev->dev, irq, lpi2c_imx_isr, 0, 602 pdev->name, lpi2c_imx); 603 if (ret) 604 return dev_err_probe(&pdev->dev, ret, "can't claim irq %d\n", irq); 605 606 i2c_set_adapdata(&lpi2c_imx->adapter, lpi2c_imx); 607 platform_set_drvdata(pdev, lpi2c_imx); 608 609 ret = clk_bulk_prepare_enable(lpi2c_imx->num_clks, lpi2c_imx->clks); 610 if (ret) 611 return ret; 612 613 /* 614 * Lock the parent clock rate to avoid getting parent clock upon 615 * each transfer 616 */ 617 ret = devm_clk_rate_exclusive_get(&pdev->dev, lpi2c_imx->clks[0].clk); 618 if (ret) 619 return dev_err_probe(&pdev->dev, ret, 620 "can't lock I2C peripheral clock rate\n"); 621 622 lpi2c_imx->rate_per = clk_get_rate(lpi2c_imx->clks[0].clk); 623 if (!lpi2c_imx->rate_per) 624 return dev_err_probe(&pdev->dev, -EINVAL, 625 "can't get I2C peripheral clock rate\n"); 626 627 pm_runtime_set_autosuspend_delay(&pdev->dev, I2C_PM_TIMEOUT); 628 pm_runtime_use_autosuspend(&pdev->dev); 629 pm_runtime_get_noresume(&pdev->dev); 630 pm_runtime_set_active(&pdev->dev); 631 pm_runtime_enable(&pdev->dev); 632 633 temp = readl(lpi2c_imx->base + LPI2C_PARAM); 634 lpi2c_imx->txfifosize = 1 << (temp & 0x0f); 635 lpi2c_imx->rxfifosize = 1 << ((temp >> 8) & 0x0f); 636 637 /* Init optional bus recovery function */ 638 ret = lpi2c_imx_init_recovery_info(lpi2c_imx, pdev); 639 /* Give it another chance if pinctrl used is not ready yet */ 640 if (ret == -EPROBE_DEFER) 641 goto rpm_disable; 642 643 ret = i2c_add_adapter(&lpi2c_imx->adapter); 644 if (ret) 645 goto rpm_disable; 646 647 pm_runtime_mark_last_busy(&pdev->dev); 648 pm_runtime_put_autosuspend(&pdev->dev); 649 650 dev_info(&lpi2c_imx->adapter.dev, "LPI2C adapter registered\n"); 651 652 return 0; 653 654 rpm_disable: 655 pm_runtime_put(&pdev->dev); 656 pm_runtime_disable(&pdev->dev); 657 pm_runtime_dont_use_autosuspend(&pdev->dev); 658 659 return ret; 660 } 661 662 static void lpi2c_imx_remove(struct platform_device *pdev) 663 { 664 struct lpi2c_imx_struct *lpi2c_imx = platform_get_drvdata(pdev); 665 666 i2c_del_adapter(&lpi2c_imx->adapter); 667 668 pm_runtime_disable(&pdev->dev); 669 pm_runtime_dont_use_autosuspend(&pdev->dev); 670 } 671 672 static int __maybe_unused lpi2c_runtime_suspend(struct device *dev) 673 { 674 struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev); 675 676 clk_bulk_disable(lpi2c_imx->num_clks, lpi2c_imx->clks); 677 pinctrl_pm_select_sleep_state(dev); 678 679 return 0; 680 } 681 682 static int __maybe_unused lpi2c_runtime_resume(struct device *dev) 683 { 684 struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev); 685 int ret; 686 687 pinctrl_pm_select_default_state(dev); 688 ret = clk_bulk_enable(lpi2c_imx->num_clks, lpi2c_imx->clks); 689 if (ret) { 690 dev_err(dev, "failed to enable I2C clock, ret=%d\n", ret); 691 return ret; 692 } 693 694 return 0; 695 } 696 697 static const struct dev_pm_ops lpi2c_pm_ops = { 698 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 699 pm_runtime_force_resume) 700 SET_RUNTIME_PM_OPS(lpi2c_runtime_suspend, 701 lpi2c_runtime_resume, NULL) 702 }; 703 704 static struct platform_driver lpi2c_imx_driver = { 705 .probe = lpi2c_imx_probe, 706 .remove_new = lpi2c_imx_remove, 707 .driver = { 708 .name = DRIVER_NAME, 709 .of_match_table = lpi2c_imx_of_match, 710 .pm = &lpi2c_pm_ops, 711 }, 712 }; 713 714 module_platform_driver(lpi2c_imx_driver); 715 716 MODULE_AUTHOR("Gao Pan <pandy.gao@nxp.com>"); 717 MODULE_DESCRIPTION("I2C adapter driver for LPI2C bus"); 718 MODULE_LICENSE("GPL"); 719