drivers/i2c/busses/i2c-qup.c

   1 /*
   2  * Copyright (c) 2009-2013, The Linux Foundation. All rights reserved.
   3  * Copyright (c) 2014, Sony Mobile Communications AB.
   4  *
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 and
   8  * only version 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16
  17 #include <linux/clk.h>
  18 #include <linux/delay.h>
  19 #include <linux/err.h>
  20 #include <linux/i2c.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/io.h>
  23 #include <linux/module.h>
  24 #include <linux/of.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/pm_runtime.h>
  27
  28 /* QUP Registers */
  29 #define QUP_CONFIG              0x000
  30 #define QUP_STATE               0x004
  31 #define QUP_IO_MODE             0x008
  32 #define QUP_SW_RESET            0x00c
  33 #define QUP_OPERATIONAL         0x018
  34 #define QUP_ERROR_FLAGS         0x01c
  35 #define QUP_ERROR_FLAGS_EN      0x020
  36 #define QUP_HW_VERSION          0x030
  37 #define QUP_MX_OUTPUT_CNT       0x100
  38 #define QUP_OUT_FIFO_BASE       0x110
  39 #define QUP_MX_WRITE_CNT        0x150
  40 #define QUP_MX_INPUT_CNT        0x200
  41 #define QUP_MX_READ_CNT         0x208
  42 #define QUP_IN_FIFO_BASE        0x218
  43 #define QUP_I2C_CLK_CTL         0x400
  44 #define QUP_I2C_STATUS          0x404
  45
  46 /* QUP States and reset values */
  47 #define QUP_RESET_STATE         0
  48 #define QUP_RUN_STATE           1
  49 #define QUP_PAUSE_STATE         3
  50 #define QUP_STATE_MASK          3
  51
  52 #define QUP_STATE_VALID         BIT(2)
  53 #define QUP_I2C_MAST_GEN        BIT(4)
  54
  55 #define QUP_OPERATIONAL_RESET   0x000ff0
  56 #define QUP_I2C_STATUS_RESET    0xfffffc
  57
  58 /* QUP OPERATIONAL FLAGS */
  59 #define QUP_I2C_NACK_FLAG       BIT(3)
  60 #define QUP_OUT_NOT_EMPTY       BIT(4)
  61 #define QUP_IN_NOT_EMPTY        BIT(5)
  62 #define QUP_OUT_FULL            BIT(6)
  63 #define QUP_OUT_SVC_FLAG        BIT(8)
  64 #define QUP_IN_SVC_FLAG         BIT(9)
  65 #define QUP_MX_OUTPUT_DONE      BIT(10)
  66 #define QUP_MX_INPUT_DONE       BIT(11)
  67
  68 /* I2C mini core related values */
  69 #define QUP_CLOCK_AUTO_GATE     BIT(13)
  70 #define I2C_MINI_CORE           (2 << 8)
  71 #define I2C_N_VAL               15
  72 /* Most significant word offset in FIFO port */
  73 #define QUP_MSW_SHIFT           (I2C_N_VAL + 1)
  74
  75 /* Packing/Unpacking words in FIFOs, and IO modes */
  76 #define QUP_OUTPUT_BLK_MODE     (1 << 10)
  77 #define QUP_INPUT_BLK_MODE      (1 << 12)
  78 #define QUP_UNPACK_EN           BIT(14)
  79 #define QUP_PACK_EN             BIT(15)
  80
  81 #define QUP_REPACK_EN           (QUP_UNPACK_EN | QUP_PACK_EN)
  82
  83 #define QUP_OUTPUT_BLOCK_SIZE(x)(((x) >> 0) & 0x03)
  84 #define QUP_OUTPUT_FIFO_SIZE(x) (((x) >> 2) & 0x07)
  85 #define QUP_INPUT_BLOCK_SIZE(x) (((x) >> 5) & 0x03)
  86 #define QUP_INPUT_FIFO_SIZE(x)  (((x) >> 7) & 0x07)
  87
  88 /* QUP tags */
  89 #define QUP_TAG_START           (1 << 8)
  90 #define QUP_TAG_DATA            (2 << 8)
  91 #define QUP_TAG_STOP            (3 << 8)
  92 #define QUP_TAG_REC             (4 << 8)
  93
  94 /* Status, Error flags */
  95 #define I2C_STATUS_WR_BUFFER_FULL       BIT(0)
  96 #define I2C_STATUS_BUS_ACTIVE           BIT(8)
  97 #define I2C_STATUS_ERROR_MASK           0x38000fc
  98 #define QUP_STATUS_ERROR_FLAGS          0x7c
  99
 100 #define QUP_READ_LIMIT                  256
 101
 102 struct qup_i2c_dev {
 103         struct device           *dev;
 104         void __iomem            *base;
 105         int                     irq;
 106         struct clk              *clk;
 107         struct clk              *pclk;
 108         struct i2c_adapter      adap;
 109
 110         int                     clk_ctl;
 111         int                     out_fifo_sz;
 112         int                     in_fifo_sz;
 113         int                     out_blk_sz;
 114         int                     in_blk_sz;
 115
 116         unsigned long           one_byte_t;
 117
 118         struct i2c_msg          *msg;
 119         /* Current posion in user message buffer */
 120         int                     pos;
 121         /* I2C protocol errors */
 122         u32                     bus_err;
 123         /* QUP core errors */
 124         u32                     qup_err;
 125
 126         struct completion       xfer;
 127 };
 128
 129 static irqreturn_t qup_i2c_interrupt(int irq, void *dev)
 130 {
 131         struct qup_i2c_dev *qup = dev;
 132         u32 bus_err;
 133         u32 qup_err;
 134         u32 opflags;
 135
 136         bus_err = readl(qup->base + QUP_I2C_STATUS);
 137         qup_err = readl(qup->base + QUP_ERROR_FLAGS);
 138         opflags = readl(qup->base + QUP_OPERATIONAL);
 139
 140         if (!qup->msg) {
 141                 /* Clear Error interrupt */
 142                 writel(QUP_RESET_STATE, qup->base + QUP_STATE);
 143                 return IRQ_HANDLED;
 144         }
 145
 146         bus_err &= I2C_STATUS_ERROR_MASK;
 147         qup_err &= QUP_STATUS_ERROR_FLAGS;
 148
 149         if (qup_err) {
 150                 /* Clear Error interrupt */
 151                 writel(qup_err, qup->base + QUP_ERROR_FLAGS);
 152                 goto done;
 153         }
 154
 155         if (bus_err) {
 156                 /* Clear Error interrupt */
 157                 writel(QUP_RESET_STATE, qup->base + QUP_STATE);
 158                 goto done;
 159         }
 160
 161         if (opflags & QUP_IN_SVC_FLAG)
 162                 writel(QUP_IN_SVC_FLAG, qup->base + QUP_OPERATIONAL);
 163
 164         if (opflags & QUP_OUT_SVC_FLAG)
 165                 writel(QUP_OUT_SVC_FLAG, qup->base + QUP_OPERATIONAL);
 166
 167 done:
 168         qup->qup_err = qup_err;
 169         qup->bus_err = bus_err;
 170         complete(&qup->xfer);
 171         return IRQ_HANDLED;
 172 }
 173
 174 static int qup_i2c_poll_state_mask(struct qup_i2c_dev *qup,
 175                                    u32 req_state, u32 req_mask)
 176 {
 177         int retries = 1;
 178         u32 state;
 179
 180         /*
 181          * State transition takes 3 AHB clocks cycles + 3 I2C master clock
 182          * cycles. So retry once after a 1uS delay.
 183          */
 184         do {
 185                 state = readl(qup->base + QUP_STATE);
 186
 187                 if (state & QUP_STATE_VALID &&
 188                     (state & req_mask) == req_state)
 189                         return 0;
 190
 191                 udelay(1);
 192         } while (retries--);
 193
 194         return -ETIMEDOUT;
 195 }
 196
 197 static int qup_i2c_poll_state(struct qup_i2c_dev *qup, u32 req_state)
 198 {
 199         return qup_i2c_poll_state_mask(qup, req_state, QUP_STATE_MASK);
 200 }
 201
 202 static int qup_i2c_poll_state_valid(struct qup_i2c_dev *qup)
 203 {
 204         return qup_i2c_poll_state_mask(qup, 0, 0);
 205 }
 206
 207 static int qup_i2c_poll_state_i2c_master(struct qup_i2c_dev *qup)
 208 {
 209         return qup_i2c_poll_state_mask(qup, QUP_I2C_MAST_GEN, QUP_I2C_MAST_GEN);
 210 }
 211
 212 static int qup_i2c_change_state(struct qup_i2c_dev *qup, u32 state)
 213 {
 214         if (qup_i2c_poll_state_valid(qup) != 0)
 215                 return -EIO;
 216
 217         writel(state, qup->base + QUP_STATE);
 218
 219         if (qup_i2c_poll_state(qup, state) != 0)
 220                 return -EIO;
 221         return 0;
 222 }
 223
 224 static int qup_i2c_wait_writeready(struct qup_i2c_dev *qup)
 225 {
 226         unsigned long timeout;
 227         u32 opflags;
 228         u32 status;
 229
 230         timeout = jiffies + HZ;
 231
 232         for (;;) {
 233                 opflags = readl(qup->base + QUP_OPERATIONAL);
 234                 status = readl(qup->base + QUP_I2C_STATUS);
 235
 236                 if (!(opflags & QUP_OUT_NOT_EMPTY) &&
 237                     !(status & I2C_STATUS_BUS_ACTIVE))
 238                         return 0;
 239
 240                 if (time_after(jiffies, timeout))
 241                         return -ETIMEDOUT;
 242
 243                 usleep_range(qup->one_byte_t, qup->one_byte_t * 2);
 244         }
 245 }
 246
 247 static void qup_i2c_set_write_mode(struct qup_i2c_dev *qup, struct i2c_msg *msg)
 248 {
 249         /* Number of entries to shift out, including the start */
 250         int total = msg->len + 1;
 251
 252         if (total < qup->out_fifo_sz) {
 253                 /* FIFO mode */
 254                 writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE);
 255                 writel(total, qup->base + QUP_MX_WRITE_CNT);
 256         } else {
 257                 /* BLOCK mode (transfer data on chunks) */
 258                 writel(QUP_OUTPUT_BLK_MODE | QUP_REPACK_EN,
 259                        qup->base + QUP_IO_MODE);
 260                 writel(total, qup->base + QUP_MX_OUTPUT_CNT);
 261         }
 262 }
 263
 264 static void qup_i2c_issue_write(struct qup_i2c_dev *qup, struct i2c_msg *msg)
 265 {
 266         u32 addr = msg->addr << 1;
 267         u32 qup_tag;
 268         u32 opflags;
 269         int idx;
 270         u32 val;
 271
 272         if (qup->pos == 0) {
 273                 val = QUP_TAG_START | addr;
 274                 idx = 1;
 275         } else {
 276                 val = 0;
 277                 idx = 0;
 278         }
 279
 280         while (qup->pos < msg->len) {
 281                 /* Check that there's space in the FIFO for our pair */
 282                 opflags = readl(qup->base + QUP_OPERATIONAL);
 283                 if (opflags & QUP_OUT_FULL)
 284                         break;
 285
 286                 if (qup->pos == msg->len - 1)
 287                         qup_tag = QUP_TAG_STOP;
 288                 else
 289                         qup_tag = QUP_TAG_DATA;
 290
 291                 if (idx & 1)
 292                         val |= (qup_tag | msg->buf[qup->pos]) << QUP_MSW_SHIFT;
 293                 else
 294                         val = qup_tag | msg->buf[qup->pos];
 295
 296                 /* Write out the pair and the last odd value */
 297                 if (idx & 1 || qup->pos == msg->len - 1)
 298                         writel(val, qup->base + QUP_OUT_FIFO_BASE);
 299
 300                 qup->pos++;
 301                 idx++;
 302         }
 303 }
 304
 305 static int qup_i2c_write_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
 306 {
 307         unsigned long left;
 308         int ret;
 309
 310         qup->msg = msg;
 311         qup->pos = 0;
 312
 313         enable_irq(qup->irq);
 314
 315         qup_i2c_set_write_mode(qup, msg);
 316
 317         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 318         if (ret)
 319                 goto err;
 320
 321         writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);
 322
 323         do {
 324                 ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
 325                 if (ret)
 326                         goto err;
 327
 328                 qup_i2c_issue_write(qup, msg);
 329
 330                 ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 331                 if (ret)
 332                         goto err;
 333
 334                 left = wait_for_completion_timeout(&qup->xfer, HZ);
 335                 if (!left) {
 336                         writel(1, qup->base + QUP_SW_RESET);
 337                         ret = -ETIMEDOUT;
 338                         goto err;
 339                 }
 340
 341                 if (qup->bus_err || qup->qup_err) {
 342                         if (qup->bus_err & QUP_I2C_NACK_FLAG)
 343                                 dev_err(qup->dev, "NACK from %x\n", msg->addr);
 344                         ret = -EIO;
 345                         goto err;
 346                 }
 347         } while (qup->pos < msg->len);
 348
 349         /* Wait for the outstanding data in the fifo to drain */
 350         ret = qup_i2c_wait_writeready(qup);
 351
 352 err:
 353         disable_irq(qup->irq);
 354         qup->msg = NULL;
 355
 356         return ret;
 357 }
 358
 359 static void qup_i2c_set_read_mode(struct qup_i2c_dev *qup, int len)
 360 {
 361         if (len < qup->in_fifo_sz) {
 362                 /* FIFO mode */
 363                 writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE);
 364                 writel(len, qup->base + QUP_MX_READ_CNT);
 365         } else {
 366                 /* BLOCK mode (transfer data on chunks) */
 367                 writel(QUP_INPUT_BLK_MODE | QUP_REPACK_EN,
 368                        qup->base + QUP_IO_MODE);
 369                 writel(len, qup->base + QUP_MX_INPUT_CNT);
 370         }
 371 }
 372
 373 static void qup_i2c_issue_read(struct qup_i2c_dev *qup, struct i2c_msg *msg)
 374 {
 375         u32 addr, len, val;
 376
 377         addr = (msg->addr << 1) | 1;
 378
 379         /* 0 is used to specify a length 256 (QUP_READ_LIMIT) */
 380         len = (msg->len == QUP_READ_LIMIT) ? 0 : msg->len;
 381
 382         val = ((QUP_TAG_REC | len) << QUP_MSW_SHIFT) | QUP_TAG_START | addr;
 383         writel(val, qup->base + QUP_OUT_FIFO_BASE);
 384 }
 385
 386
 387 static void qup_i2c_read_fifo(struct qup_i2c_dev *qup, struct i2c_msg *msg)
 388 {
 389         u32 opflags;
 390         u32 val = 0;
 391         int idx;
 392
 393         for (idx = 0; qup->pos < msg->len; idx++) {
 394                 if ((idx & 1) == 0) {
 395                         /* Check that FIFO have data */
 396                         opflags = readl(qup->base + QUP_OPERATIONAL);
 397                         if (!(opflags & QUP_IN_NOT_EMPTY))
 398                                 break;
 399
 400                         /* Reading 2 words at time */
 401                         val = readl(qup->base + QUP_IN_FIFO_BASE);
 402
 403                         msg->buf[qup->pos++] = val & 0xFF;
 404                 } else {
 405                         msg->buf[qup->pos++] = val >> QUP_MSW_SHIFT;
 406                 }
 407         }
 408 }
 409
 410 static int qup_i2c_read_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
 411 {
 412         unsigned long left;
 413         int ret;
 414
 415         qup->msg = msg;
 416         qup->pos  = 0;
 417
 418         enable_irq(qup->irq);
 419
 420         qup_i2c_set_read_mode(qup, msg->len);
 421
 422         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 423         if (ret)
 424                 goto err;
 425
 426         writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);
 427
 428         ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
 429         if (ret)
 430                 goto err;
 431
 432         qup_i2c_issue_read(qup, msg);
 433
 434         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 435         if (ret)
 436                 goto err;
 437
 438         do {
 439                 left = wait_for_completion_timeout(&qup->xfer, HZ);
 440                 if (!left) {
 441                         writel(1, qup->base + QUP_SW_RESET);
 442                         ret = -ETIMEDOUT;
 443                         goto err;
 444                 }
 445
 446                 if (qup->bus_err || qup->qup_err) {
 447                         if (qup->bus_err & QUP_I2C_NACK_FLAG)
 448                                 dev_err(qup->dev, "NACK from %x\n", msg->addr);
 449                         ret = -EIO;
 450                         goto err;
 451                 }
 452
 453                 qup_i2c_read_fifo(qup, msg);
 454         } while (qup->pos < msg->len);
 455
 456 err:
 457         disable_irq(qup->irq);
 458         qup->msg = NULL;
 459
 460         return ret;
 461 }
 462
 463 static int qup_i2c_xfer(struct i2c_adapter *adap,
 464                         struct i2c_msg msgs[],
 465                         int num)
 466 {
 467         struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
 468         int ret, idx;
 469
 470         ret = pm_runtime_get_sync(qup->dev);
 471         if (ret < 0)
 472                 goto out;
 473
 474         writel(1, qup->base + QUP_SW_RESET);
 475         ret = qup_i2c_poll_state(qup, QUP_RESET_STATE);
 476         if (ret)
 477                 goto out;
 478
 479         /* Configure QUP as I2C mini core */
 480         writel(I2C_MINI_CORE | I2C_N_VAL, qup->base + QUP_CONFIG);
 481
 482         for (idx = 0; idx < num; idx++) {
 483                 if (msgs[idx].len == 0) {
 484                         ret = -EINVAL;
 485                         goto out;
 486                 }
 487
 488                 if (qup_i2c_poll_state_i2c_master(qup)) {
 489                         ret = -EIO;
 490                         goto out;
 491                 }
 492
 493                 if (msgs[idx].flags & I2C_M_RD)
 494                         ret = qup_i2c_read_one(qup, &msgs[idx]);
 495                 else
 496                         ret = qup_i2c_write_one(qup, &msgs[idx]);
 497
 498                 if (ret)
 499                         break;
 500
 501                 ret = qup_i2c_change_state(qup, QUP_RESET_STATE);
 502                 if (ret)
 503                         break;
 504         }
 505
 506         if (ret == 0)
 507                 ret = num;
 508 out:
 509
 510         pm_runtime_mark_last_busy(qup->dev);
 511         pm_runtime_put_autosuspend(qup->dev);
 512
 513         return ret;
 514 }
 515
 516 static u32 qup_i2c_func(struct i2c_adapter *adap)
 517 {
 518         return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
 519 }
 520
 521 static const struct i2c_algorithm qup_i2c_algo = {
 522         .master_xfer    = qup_i2c_xfer,
 523         .functionality  = qup_i2c_func,
 524 };
 525
 526 /*
 527  * The QUP block will issue a NACK and STOP on the bus when reaching
 528  * the end of the read, the length of the read is specified as one byte
 529  * which limits the possible read to 256 (QUP_READ_LIMIT) bytes.
 530  */
 531 static struct i2c_adapter_quirks qup_i2c_quirks = {
 532         .max_read_len = QUP_READ_LIMIT,
 533 };
 534
 535 static void qup_i2c_enable_clocks(struct qup_i2c_dev *qup)
 536 {
 537         clk_prepare_enable(qup->clk);
 538         clk_prepare_enable(qup->pclk);
 539 }
 540
 541 static void qup_i2c_disable_clocks(struct qup_i2c_dev *qup)
 542 {
 543         u32 config;
 544
 545         qup_i2c_change_state(qup, QUP_RESET_STATE);
 546         clk_disable_unprepare(qup->clk);
 547         config = readl(qup->base + QUP_CONFIG);
 548         config |= QUP_CLOCK_AUTO_GATE;
 549         writel(config, qup->base + QUP_CONFIG);
 550         clk_disable_unprepare(qup->pclk);
 551 }
 552
 553 static int qup_i2c_probe(struct platform_device *pdev)
 554 {
 555         static const int blk_sizes[] = {4, 16, 32};
 556         struct device_node *node = pdev->dev.of_node;
 557         struct qup_i2c_dev *qup;
 558         unsigned long one_bit_t;
 559         struct resource *res;
 560         u32 io_mode, hw_ver, size;
 561         int ret, fs_div, hs_div;
 562         int src_clk_freq;
 563         u32 clk_freq = 100000;
 564
 565         qup = devm_kzalloc(&pdev->dev, sizeof(*qup), GFP_KERNEL);
 566         if (!qup)
 567                 return -ENOMEM;
 568
 569         qup->dev = &pdev->dev;
 570         init_completion(&qup->xfer);
 571         platform_set_drvdata(pdev, qup);
 572
 573         of_property_read_u32(node, "clock-frequency", &clk_freq);
 574
 575         /* We support frequencies up to FAST Mode (400KHz) */
 576         if (!clk_freq || clk_freq > 400000) {
 577                 dev_err(qup->dev, "clock frequency not supported %d\n",
 578                         clk_freq);
 579                 return -EINVAL;
 580         }
 581
 582         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 583         qup->base = devm_ioremap_resource(qup->dev, res);
 584         if (IS_ERR(qup->base))
 585                 return PTR_ERR(qup->base);
 586
 587         qup->irq = platform_get_irq(pdev, 0);
 588         if (qup->irq < 0) {
 589                 dev_err(qup->dev, "No IRQ defined\n");
 590                 return qup->irq;
 591         }
 592
 593         qup->clk = devm_clk_get(qup->dev, "core");
 594         if (IS_ERR(qup->clk)) {
 595                 dev_err(qup->dev, "Could not get core clock\n");
 596                 return PTR_ERR(qup->clk);
 597         }
 598
 599         qup->pclk = devm_clk_get(qup->dev, "iface");
 600         if (IS_ERR(qup->pclk)) {
 601                 dev_err(qup->dev, "Could not get iface clock\n");
 602                 return PTR_ERR(qup->pclk);
 603         }
 604
 605         qup_i2c_enable_clocks(qup);
 606
 607         /*
 608          * Bootloaders might leave a pending interrupt on certain QUP's,
 609          * so we reset the core before registering for interrupts.
 610          */
 611         writel(1, qup->base + QUP_SW_RESET);
 612         ret = qup_i2c_poll_state_valid(qup);
 613         if (ret)
 614                 goto fail;
 615
 616         ret = devm_request_irq(qup->dev, qup->irq, qup_i2c_interrupt,
 617                                IRQF_TRIGGER_HIGH, "i2c_qup", qup);
 618         if (ret) {
 619                 dev_err(qup->dev, "Request %d IRQ failed\n", qup->irq);
 620                 goto fail;
 621         }
 622         disable_irq(qup->irq);
 623
 624         hw_ver = readl(qup->base + QUP_HW_VERSION);
 625         dev_dbg(qup->dev, "Revision %x\n", hw_ver);
 626
 627         io_mode = readl(qup->base + QUP_IO_MODE);
 628
 629         /*
 630          * The block/fifo size w.r.t. 'actual data' is 1/2 due to 'tag'
 631          * associated with each byte written/received
 632          */
 633         size = QUP_OUTPUT_BLOCK_SIZE(io_mode);
 634         if (size >= ARRAY_SIZE(blk_sizes)) {
 635                 ret = -EIO;
 636                 goto fail;
 637         }
 638         qup->out_blk_sz = blk_sizes[size] / 2;
 639
 640         size = QUP_INPUT_BLOCK_SIZE(io_mode);
 641         if (size >= ARRAY_SIZE(blk_sizes)) {
 642                 ret = -EIO;
 643                 goto fail;
 644         }
 645         qup->in_blk_sz = blk_sizes[size] / 2;
 646
 647         size = QUP_OUTPUT_FIFO_SIZE(io_mode);
 648         qup->out_fifo_sz = qup->out_blk_sz * (2 << size);
 649
 650         size = QUP_INPUT_FIFO_SIZE(io_mode);
 651         qup->in_fifo_sz = qup->in_blk_sz * (2 << size);
 652
 653         src_clk_freq = clk_get_rate(qup->clk);
 654         fs_div = ((src_clk_freq / clk_freq) / 2) - 3;
 655         hs_div = 3;
 656         qup->clk_ctl = (hs_div << 8) | (fs_div & 0xff);
 657
 658         /*
 659          * Time it takes for a byte to be clocked out on the bus.
 660          * Each byte takes 9 clock cycles (8 bits + 1 ack).
 661          */
 662         one_bit_t = (USEC_PER_SEC / clk_freq) + 1;
 663         qup->one_byte_t = one_bit_t * 9;
 664
 665         dev_dbg(qup->dev, "IN:block:%d, fifo:%d, OUT:block:%d, fifo:%d\n",
 666                 qup->in_blk_sz, qup->in_fifo_sz,
 667                 qup->out_blk_sz, qup->out_fifo_sz);
 668
 669         i2c_set_adapdata(&qup->adap, qup);
 670         qup->adap.algo = &qup_i2c_algo;
 671         qup->adap.quirks = &qup_i2c_quirks;
 672         qup->adap.dev.parent = qup->dev;
 673         qup->adap.dev.of_node = pdev->dev.of_node;
 674         strlcpy(qup->adap.name, "QUP I2C adapter", sizeof(qup->adap.name));
 675
 676         pm_runtime_set_autosuspend_delay(qup->dev, MSEC_PER_SEC);
 677         pm_runtime_use_autosuspend(qup->dev);
 678         pm_runtime_set_active(qup->dev);
 679         pm_runtime_enable(qup->dev);
 680
 681         ret = i2c_add_adapter(&qup->adap);
 682         if (ret)
 683                 goto fail_runtime;
 684
 685         return 0;
 686
 687 fail_runtime:
 688         pm_runtime_disable(qup->dev);
 689         pm_runtime_set_suspended(qup->dev);
 690 fail:
 691         qup_i2c_disable_clocks(qup);
 692         return ret;
 693 }
 694
 695 static int qup_i2c_remove(struct platform_device *pdev)
 696 {
 697         struct qup_i2c_dev *qup = platform_get_drvdata(pdev);
 698
 699         disable_irq(qup->irq);
 700         qup_i2c_disable_clocks(qup);
 701         i2c_del_adapter(&qup->adap);
 702         pm_runtime_disable(qup->dev);
 703         pm_runtime_set_suspended(qup->dev);
 704         return 0;
 705 }
 706
 707 #ifdef CONFIG_PM
 708 static int qup_i2c_pm_suspend_runtime(struct device *device)
 709 {
 710         struct qup_i2c_dev *qup = dev_get_drvdata(device);
 711
 712         dev_dbg(device, "pm_runtime: suspending...\n");
 713         qup_i2c_disable_clocks(qup);
 714         return 0;
 715 }
 716
 717 static int qup_i2c_pm_resume_runtime(struct device *device)
 718 {
 719         struct qup_i2c_dev *qup = dev_get_drvdata(device);
 720
 721         dev_dbg(device, "pm_runtime: resuming...\n");
 722         qup_i2c_enable_clocks(qup);
 723         return 0;
 724 }
 725 #endif
 726
 727 #ifdef CONFIG_PM_SLEEP
 728 static int qup_i2c_suspend(struct device *device)
 729 {
 730         qup_i2c_pm_suspend_runtime(device);
 731         return 0;
 732 }
 733
 734 static int qup_i2c_resume(struct device *device)
 735 {
 736         qup_i2c_pm_resume_runtime(device);
 737         pm_runtime_mark_last_busy(device);
 738         pm_request_autosuspend(device);
 739         return 0;
 740 }
 741 #endif
 742
 743 static const struct dev_pm_ops qup_i2c_qup_pm_ops = {
 744         SET_SYSTEM_SLEEP_PM_OPS(
 745                 qup_i2c_suspend,
 746                 qup_i2c_resume)
 747         SET_RUNTIME_PM_OPS(
 748                 qup_i2c_pm_suspend_runtime,
 749                 qup_i2c_pm_resume_runtime,
 750                 NULL)
 751 };
 752
 753 static const struct of_device_id qup_i2c_dt_match[] = {
 754         { .compatible = "qcom,i2c-qup-v1.1.1" },
 755         { .compatible = "qcom,i2c-qup-v2.1.1" },
 756         { .compatible = "qcom,i2c-qup-v2.2.1" },
 757         {}
 758 };
 759 MODULE_DEVICE_TABLE(of, qup_i2c_dt_match);
 760
 761 static struct platform_driver qup_i2c_driver = {
 762         .probe  = qup_i2c_probe,
 763         .remove = qup_i2c_remove,
 764         .driver = {
 765                 .name = "i2c_qup",
 766                 .pm = &qup_i2c_qup_pm_ops,
 767                 .of_match_table = qup_i2c_dt_match,
 768         },
 769 };
 770
 771 module_platform_driver(qup_i2c_driver);
 772
 773 MODULE_LICENSE("GPL v2");
 774 MODULE_ALIAS("platform:i2c_qup");