drivers/i2c/busses/i2c-imx-lpi2c.c

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