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, datavd;
 205         unsigned int clk_rate, clk_cycle, clkhi, clklo;
 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 (!clk_rate)
 213                 return -EINVAL;
 214
 215         if (lpi2c_imx->mode == HS || lpi2c_imx->mode == ULTRA_FAST)
 216                 filt = 0;
 217         else
 218                 filt = 2;
 219
 220         for (prescale = 0; prescale <= 7; prescale++) {
 221                 clk_cycle = clk_rate / ((1 << prescale) * lpi2c_imx->bitrate)
 222                             - 3 - (filt >> 1);
 223                 clkhi = DIV_ROUND_UP(clk_cycle, I2C_CLK_RATIO + 1);
 224                 clklo = clk_cycle - clkhi;
 225                 if (clklo < 64)
 226                         break;
 227         }
 228
 229         if (prescale > 7)
 230                 return -EINVAL;
 231
 232         /* set MCFGR1: PINCFG, PRESCALE, IGNACK */
 233         if (lpi2c_imx->mode == ULTRA_FAST)
 234                 pincfg = TWO_PIN_OO;
 235         else
 236                 pincfg = TWO_PIN_OD;
 237         temp = prescale | pincfg << 24;
 238
 239         if (lpi2c_imx->mode == ULTRA_FAST)
 240                 temp |= MCFGR1_IGNACK;
 241
 242         writel(temp, lpi2c_imx->base + LPI2C_MCFGR1);
 243
 244         /* set MCFGR2: FILTSDA, FILTSCL */
 245         temp = (filt << 16) | (filt << 24);
 246         writel(temp, lpi2c_imx->base + LPI2C_MCFGR2);
 247
 248         /* set MCCR: DATAVD, SETHOLD, CLKHI, CLKLO */
 249         sethold = clkhi;
 250         datavd = clkhi >> 1;
 251         temp = datavd << 24 | sethold << 16 | clkhi << 8 | clklo;
 252
 253         if (lpi2c_imx->mode == HS)
 254                 writel(temp, lpi2c_imx->base + LPI2C_MCCR1);
 255         else
 256                 writel(temp, lpi2c_imx->base + LPI2C_MCCR0);
 257
 258         return 0;
 259 }
 260
 261 static int lpi2c_imx_master_enable(struct lpi2c_imx_struct *lpi2c_imx)
 262 {
 263         unsigned int temp;
 264         int ret;
 265
 266         ret = pm_runtime_resume_and_get(lpi2c_imx->adapter.dev.parent);
 267         if (ret < 0)
 268                 return ret;
 269
 270         temp = MCR_RST;
 271         writel(temp, lpi2c_imx->base + LPI2C_MCR);
 272         writel(0, lpi2c_imx->base + LPI2C_MCR);
 273
 274         ret = lpi2c_imx_config(lpi2c_imx);
 275         if (ret)
 276                 goto rpm_put;
 277
 278         temp = readl(lpi2c_imx->base + LPI2C_MCR);
 279         temp |= MCR_MEN;
 280         writel(temp, lpi2c_imx->base + LPI2C_MCR);
 281
 282         return 0;
 283
 284 rpm_put:
 285         pm_runtime_mark_last_busy(lpi2c_imx->adapter.dev.parent);
 286         pm_runtime_put_autosuspend(lpi2c_imx->adapter.dev.parent);
 287
 288         return ret;
 289 }
 290
 291 static int lpi2c_imx_master_disable(struct lpi2c_imx_struct *lpi2c_imx)
 292 {
 293         u32 temp;
 294
 295         temp = readl(lpi2c_imx->base + LPI2C_MCR);
 296         temp &= ~MCR_MEN;
 297         writel(temp, lpi2c_imx->base + LPI2C_MCR);
 298
 299         pm_runtime_mark_last_busy(lpi2c_imx->adapter.dev.parent);
 300         pm_runtime_put_autosuspend(lpi2c_imx->adapter.dev.parent);
 301
 302         return 0;
 303 }
 304
 305 static int lpi2c_imx_msg_complete(struct lpi2c_imx_struct *lpi2c_imx)
 306 {
 307         unsigned long timeout;
 308
 309         timeout = wait_for_completion_timeout(&lpi2c_imx->complete, HZ);
 310
 311         return timeout ? 0 : -ETIMEDOUT;
 312 }
 313
 314 static int lpi2c_imx_txfifo_empty(struct lpi2c_imx_struct *lpi2c_imx)
 315 {
 316         unsigned long orig_jiffies = jiffies;
 317         u32 txcnt;
 318
 319         do {
 320                 txcnt = readl(lpi2c_imx->base + LPI2C_MFSR) & 0xff;
 321
 322                 if (readl(lpi2c_imx->base + LPI2C_MSR) & MSR_NDF) {
 323                         dev_dbg(&lpi2c_imx->adapter.dev, "NDF detected\n");
 324                         return -EIO;
 325                 }
 326
 327                 if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) {
 328                         dev_dbg(&lpi2c_imx->adapter.dev, "txfifo empty timeout\n");
 329                         return -ETIMEDOUT;
 330                 }
 331                 schedule();
 332
 333         } while (txcnt);
 334
 335         return 0;
 336 }
 337
 338 static void lpi2c_imx_set_tx_watermark(struct lpi2c_imx_struct *lpi2c_imx)
 339 {
 340         writel(lpi2c_imx->txfifosize >> 1, lpi2c_imx->base + LPI2C_MFCR);
 341 }
 342
 343 static void lpi2c_imx_set_rx_watermark(struct lpi2c_imx_struct *lpi2c_imx)
 344 {
 345         unsigned int temp, remaining;
 346
 347         remaining = lpi2c_imx->msglen - lpi2c_imx->delivered;
 348
 349         if (remaining > (lpi2c_imx->rxfifosize >> 1))
 350                 temp = lpi2c_imx->rxfifosize >> 1;
 351         else
 352                 temp = 0;
 353
 354         writel(temp << 16, lpi2c_imx->base + LPI2C_MFCR);
 355 }
 356
 357 static void lpi2c_imx_write_txfifo(struct lpi2c_imx_struct *lpi2c_imx)
 358 {
 359         unsigned int data, txcnt;
 360
 361         txcnt = readl(lpi2c_imx->base + LPI2C_MFSR) & 0xff;
 362
 363         while (txcnt < lpi2c_imx->txfifosize) {
 364                 if (lpi2c_imx->delivered == lpi2c_imx->msglen)
 365                         break;
 366
 367                 data = lpi2c_imx->tx_buf[lpi2c_imx->delivered++];
 368                 writel(data, lpi2c_imx->base + LPI2C_MTDR);
 369                 txcnt++;
 370         }
 371
 372         if (lpi2c_imx->delivered < lpi2c_imx->msglen)
 373                 lpi2c_imx_intctrl(lpi2c_imx, MIER_TDIE | MIER_NDIE);
 374         else
 375                 complete(&lpi2c_imx->complete);
 376 }
 377
 378 static void lpi2c_imx_read_rxfifo(struct lpi2c_imx_struct *lpi2c_imx)
 379 {
 380         unsigned int blocklen, remaining;
 381         unsigned int temp, data;
 382
 383         do {
 384                 data = readl(lpi2c_imx->base + LPI2C_MRDR);
 385                 if (data & MRDR_RXEMPTY)
 386                         break;
 387
 388                 lpi2c_imx->rx_buf[lpi2c_imx->delivered++] = data & 0xff;
 389         } while (1);
 390
 391         /*
 392          * First byte is the length of remaining packet in the SMBus block
 393          * data read. Add it to msgs->len.
 394          */
 395         if (lpi2c_imx->block_data) {
 396                 blocklen = lpi2c_imx->rx_buf[0];
 397                 lpi2c_imx->msglen += blocklen;
 398         }
 399
 400         remaining = lpi2c_imx->msglen - lpi2c_imx->delivered;
 401
 402         if (!remaining) {
 403                 complete(&lpi2c_imx->complete);
 404                 return;
 405         }
 406
 407         /* not finished, still waiting for rx data */
 408         lpi2c_imx_set_rx_watermark(lpi2c_imx);
 409
 410         /* multiple receive commands */
 411         if (lpi2c_imx->block_data) {
 412                 lpi2c_imx->block_data = 0;
 413                 temp = remaining;
 414                 temp |= (RECV_DATA << 8);
 415                 writel(temp, lpi2c_imx->base + LPI2C_MTDR);
 416         } else if (!(lpi2c_imx->delivered & 0xff)) {
 417                 temp = (remaining > CHUNK_DATA ? CHUNK_DATA : remaining) - 1;
 418                 temp |= (RECV_DATA << 8);
 419                 writel(temp, lpi2c_imx->base + LPI2C_MTDR);
 420         }
 421
 422         lpi2c_imx_intctrl(lpi2c_imx, MIER_RDIE);
 423 }
 424
 425 static void lpi2c_imx_write(struct lpi2c_imx_struct *lpi2c_imx,
 426                             struct i2c_msg *msgs)
 427 {
 428         lpi2c_imx->tx_buf = msgs->buf;
 429         lpi2c_imx_set_tx_watermark(lpi2c_imx);
 430         lpi2c_imx_write_txfifo(lpi2c_imx);
 431 }
 432
 433 static void lpi2c_imx_read(struct lpi2c_imx_struct *lpi2c_imx,
 434                            struct i2c_msg *msgs)
 435 {
 436         unsigned int temp;
 437
 438         lpi2c_imx->rx_buf = msgs->buf;
 439         lpi2c_imx->block_data = msgs->flags & I2C_M_RECV_LEN;
 440
 441         lpi2c_imx_set_rx_watermark(lpi2c_imx);
 442         temp = msgs->len > CHUNK_DATA ? CHUNK_DATA - 1 : msgs->len - 1;
 443         temp |= (RECV_DATA << 8);
 444         writel(temp, lpi2c_imx->base + LPI2C_MTDR);
 445
 446         lpi2c_imx_intctrl(lpi2c_imx, MIER_RDIE | MIER_NDIE);
 447 }
 448
 449 static int lpi2c_imx_xfer(struct i2c_adapter *adapter,
 450                           struct i2c_msg *msgs, int num)
 451 {
 452         struct lpi2c_imx_struct *lpi2c_imx = i2c_get_adapdata(adapter);
 453         unsigned int temp;
 454         int i, result;
 455
 456         result = lpi2c_imx_master_enable(lpi2c_imx);
 457         if (result)
 458                 return result;
 459
 460         for (i = 0; i < num; i++) {
 461                 result = lpi2c_imx_start(lpi2c_imx, &msgs[i]);
 462                 if (result)
 463                         goto disable;
 464
 465                 /* quick smbus */
 466                 if (num == 1 && msgs[0].len == 0)
 467                         goto stop;
 468
 469                 lpi2c_imx->rx_buf = NULL;
 470                 lpi2c_imx->tx_buf = NULL;
 471                 lpi2c_imx->delivered = 0;
 472                 lpi2c_imx->msglen = msgs[i].len;
 473                 init_completion(&lpi2c_imx->complete);
 474
 475                 if (msgs[i].flags & I2C_M_RD)
 476                         lpi2c_imx_read(lpi2c_imx, &msgs[i]);
 477                 else
 478                         lpi2c_imx_write(lpi2c_imx, &msgs[i]);
 479
 480                 result = lpi2c_imx_msg_complete(lpi2c_imx);
 481                 if (result)
 482                         goto stop;
 483
 484                 if (!(msgs[i].flags & I2C_M_RD)) {
 485                         result = lpi2c_imx_txfifo_empty(lpi2c_imx);
 486                         if (result)
 487                                 goto stop;
 488                 }
 489         }
 490
 491 stop:
 492         lpi2c_imx_stop(lpi2c_imx);
 493
 494         temp = readl(lpi2c_imx->base + LPI2C_MSR);
 495         if ((temp & MSR_NDF) && !result)
 496                 result = -EIO;
 497
 498 disable:
 499         lpi2c_imx_master_disable(lpi2c_imx);
 500
 501         dev_dbg(&lpi2c_imx->adapter.dev, "<%s> exit with: %s: %d\n", __func__,
 502                 (result < 0) ? "error" : "success msg",
 503                 (result < 0) ? result : num);
 504
 505         return (result < 0) ? result : num;
 506 }
 507
 508 static irqreturn_t lpi2c_imx_isr(int irq, void *dev_id)
 509 {
 510         struct lpi2c_imx_struct *lpi2c_imx = dev_id;
 511         unsigned int enabled;
 512         unsigned int temp;
 513
 514         enabled = readl(lpi2c_imx->base + LPI2C_MIER);
 515
 516         lpi2c_imx_intctrl(lpi2c_imx, 0);
 517         temp = readl(lpi2c_imx->base + LPI2C_MSR);
 518         temp &= enabled;
 519
 520         if (temp & MSR_RDF)
 521                 lpi2c_imx_read_rxfifo(lpi2c_imx);
 522
 523         if (temp & MSR_TDF)
 524                 lpi2c_imx_write_txfifo(lpi2c_imx);
 525
 526         if (temp & MSR_NDF)
 527                 complete(&lpi2c_imx->complete);
 528
 529         return IRQ_HANDLED;
 530 }
 531
 532 static u32 lpi2c_imx_func(struct i2c_adapter *adapter)
 533 {
 534         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
 535                 I2C_FUNC_SMBUS_READ_BLOCK_DATA;
 536 }
 537
 538 static const struct i2c_algorithm lpi2c_imx_algo = {
 539         .master_xfer    = lpi2c_imx_xfer,
 540         .functionality  = lpi2c_imx_func,
 541 };
 542
 543 static const struct of_device_id lpi2c_imx_of_match[] = {
 544         { .compatible = "fsl,imx7ulp-lpi2c" },
 545         { },
 546 };
 547 MODULE_DEVICE_TABLE(of, lpi2c_imx_of_match);
 548
 549 static int lpi2c_imx_probe(struct platform_device *pdev)
 550 {
 551         struct lpi2c_imx_struct *lpi2c_imx;
 552         unsigned int temp;
 553         int irq, ret;
 554
 555         lpi2c_imx = devm_kzalloc(&pdev->dev, sizeof(*lpi2c_imx), GFP_KERNEL);
 556         if (!lpi2c_imx)
 557                 return -ENOMEM;
 558
 559         lpi2c_imx->base = devm_platform_ioremap_resource(pdev, 0);
 560         if (IS_ERR(lpi2c_imx->base))
 561                 return PTR_ERR(lpi2c_imx->base);
 562
 563         irq = platform_get_irq(pdev, 0);
 564         if (irq < 0)
 565                 return irq;
 566
 567         lpi2c_imx->adapter.owner        = THIS_MODULE;
 568         lpi2c_imx->adapter.algo         = &lpi2c_imx_algo;
 569         lpi2c_imx->adapter.dev.parent   = &pdev->dev;
 570         lpi2c_imx->adapter.dev.of_node  = pdev->dev.of_node;
 571         strscpy(lpi2c_imx->adapter.name, pdev->name,
 572                 sizeof(lpi2c_imx->adapter.name));
 573
 574         ret = devm_clk_bulk_get_all(&pdev->dev, &lpi2c_imx->clks);
 575         if (ret < 0) {
 576                 dev_err(&pdev->dev, "can't get I2C peripheral clock, ret=%d\n", ret);
 577                 return ret;
 578         }
 579         lpi2c_imx->num_clks = ret;
 580
 581         ret = of_property_read_u32(pdev->dev.of_node,
 582                                    "clock-frequency", &lpi2c_imx->bitrate);
 583         if (ret)
 584                 lpi2c_imx->bitrate = I2C_MAX_STANDARD_MODE_FREQ;
 585
 586         ret = devm_request_irq(&pdev->dev, irq, lpi2c_imx_isr, 0,
 587                                pdev->name, lpi2c_imx);
 588         if (ret) {
 589                 dev_err(&pdev->dev, "can't claim irq %d\n", irq);
 590                 return ret;
 591         }
 592
 593         i2c_set_adapdata(&lpi2c_imx->adapter, lpi2c_imx);
 594         platform_set_drvdata(pdev, lpi2c_imx);
 595
 596         ret = clk_bulk_prepare_enable(lpi2c_imx->num_clks, lpi2c_imx->clks);
 597         if (ret)
 598                 return ret;
 599
 600         pm_runtime_set_autosuspend_delay(&pdev->dev, I2C_PM_TIMEOUT);
 601         pm_runtime_use_autosuspend(&pdev->dev);
 602         pm_runtime_get_noresume(&pdev->dev);
 603         pm_runtime_set_active(&pdev->dev);
 604         pm_runtime_enable(&pdev->dev);
 605
 606         temp = readl(lpi2c_imx->base + LPI2C_PARAM);
 607         lpi2c_imx->txfifosize = 1 << (temp & 0x0f);
 608         lpi2c_imx->rxfifosize = 1 << ((temp >> 8) & 0x0f);
 609
 610         ret = i2c_add_adapter(&lpi2c_imx->adapter);
 611         if (ret)
 612                 goto rpm_disable;
 613
 614         pm_runtime_mark_last_busy(&pdev->dev);
 615         pm_runtime_put_autosuspend(&pdev->dev);
 616
 617         dev_info(&lpi2c_imx->adapter.dev, "LPI2C adapter registered\n");
 618
 619         return 0;
 620
 621 rpm_disable:
 622         pm_runtime_put(&pdev->dev);
 623         pm_runtime_disable(&pdev->dev);
 624         pm_runtime_dont_use_autosuspend(&pdev->dev);
 625
 626         return ret;
 627 }
 628
 629 static void lpi2c_imx_remove(struct platform_device *pdev)
 630 {
 631         struct lpi2c_imx_struct *lpi2c_imx = platform_get_drvdata(pdev);
 632
 633         i2c_del_adapter(&lpi2c_imx->adapter);
 634
 635         pm_runtime_disable(&pdev->dev);
 636         pm_runtime_dont_use_autosuspend(&pdev->dev);
 637 }
 638
 639 static int __maybe_unused lpi2c_runtime_suspend(struct device *dev)
 640 {
 641         struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev);
 642
 643         clk_bulk_disable(lpi2c_imx->num_clks, lpi2c_imx->clks);
 644         pinctrl_pm_select_sleep_state(dev);
 645
 646         return 0;
 647 }
 648
 649 static int __maybe_unused lpi2c_runtime_resume(struct device *dev)
 650 {
 651         struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev);
 652         int ret;
 653
 654         pinctrl_pm_select_default_state(dev);
 655         ret = clk_bulk_enable(lpi2c_imx->num_clks, lpi2c_imx->clks);
 656         if (ret) {
 657                 dev_err(dev, "failed to enable I2C clock, ret=%d\n", ret);
 658                 return ret;
 659         }
 660
 661         return 0;
 662 }
 663
 664 static const struct dev_pm_ops lpi2c_pm_ops = {
 665         SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 666                                       pm_runtime_force_resume)
 667         SET_RUNTIME_PM_OPS(lpi2c_runtime_suspend,
 668                            lpi2c_runtime_resume, NULL)
 669 };
 670
 671 static struct platform_driver lpi2c_imx_driver = {
 672         .probe = lpi2c_imx_probe,
 673         .remove_new = lpi2c_imx_remove,
 674         .driver = {
 675                 .name = DRIVER_NAME,
 676                 .of_match_table = lpi2c_imx_of_match,
 677                 .pm = &lpi2c_pm_ops,
 678         },
 679 };
 680
 681 module_platform_driver(lpi2c_imx_driver);
 682
 683 MODULE_AUTHOR("Gao Pan <pandy.gao@nxp.com>");
 684 MODULE_DESCRIPTION("I2C adapter driver for LPI2C bus");
 685 MODULE_LICENSE("GPL");