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/atomic.h>
  18 #include <linux/clk.h>
  19 #include <linux/delay.h>
  20 #include <linux/dmaengine.h>
  21 #include <linux/dmapool.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/err.h>
  24 #include <linux/i2c.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/io.h>
  27 #include <linux/module.h>
  28 #include <linux/of.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/pm_runtime.h>
  31 #include <linux/scatterlist.h>
  32
  33 /* QUP Registers */
  34 #define QUP_CONFIG              0x000
  35 #define QUP_STATE               0x004
  36 #define QUP_IO_MODE             0x008
  37 #define QUP_SW_RESET            0x00c
  38 #define QUP_OPERATIONAL         0x018
  39 #define QUP_ERROR_FLAGS         0x01c
  40 #define QUP_ERROR_FLAGS_EN      0x020
  41 #define QUP_OPERATIONAL_MASK    0x028
  42 #define QUP_HW_VERSION          0x030
  43 #define QUP_MX_OUTPUT_CNT       0x100
  44 #define QUP_OUT_FIFO_BASE       0x110
  45 #define QUP_MX_WRITE_CNT        0x150
  46 #define QUP_MX_INPUT_CNT        0x200
  47 #define QUP_MX_READ_CNT         0x208
  48 #define QUP_IN_FIFO_BASE        0x218
  49 #define QUP_I2C_CLK_CTL         0x400
  50 #define QUP_I2C_STATUS          0x404
  51 #define QUP_I2C_MASTER_GEN      0x408
  52
  53 /* QUP States and reset values */
  54 #define QUP_RESET_STATE         0
  55 #define QUP_RUN_STATE           1
  56 #define QUP_PAUSE_STATE         3
  57 #define QUP_STATE_MASK          3
  58
  59 #define QUP_STATE_VALID         BIT(2)
  60 #define QUP_I2C_MAST_GEN        BIT(4)
  61 #define QUP_I2C_FLUSH           BIT(6)
  62
  63 #define QUP_OPERATIONAL_RESET   0x000ff0
  64 #define QUP_I2C_STATUS_RESET    0xfffffc
  65
  66 /* QUP OPERATIONAL FLAGS */
  67 #define QUP_I2C_NACK_FLAG       BIT(3)
  68 #define QUP_OUT_NOT_EMPTY       BIT(4)
  69 #define QUP_IN_NOT_EMPTY        BIT(5)
  70 #define QUP_OUT_FULL            BIT(6)
  71 #define QUP_OUT_SVC_FLAG        BIT(8)
  72 #define QUP_IN_SVC_FLAG         BIT(9)
  73 #define QUP_MX_OUTPUT_DONE      BIT(10)
  74 #define QUP_MX_INPUT_DONE       BIT(11)
  75
  76 /* I2C mini core related values */
  77 #define QUP_CLOCK_AUTO_GATE     BIT(13)
  78 #define I2C_MINI_CORE           (2 << 8)
  79 #define I2C_N_VAL               15
  80 #define I2C_N_VAL_V2            7
  81
  82 /* Most significant word offset in FIFO port */
  83 #define QUP_MSW_SHIFT           (I2C_N_VAL + 1)
  84
  85 /* Packing/Unpacking words in FIFOs, and IO modes */
  86 #define QUP_OUTPUT_BLK_MODE     (1 << 10)
  87 #define QUP_OUTPUT_BAM_MODE     (3 << 10)
  88 #define QUP_INPUT_BLK_MODE      (1 << 12)
  89 #define QUP_INPUT_BAM_MODE      (3 << 12)
  90 #define QUP_BAM_MODE            (QUP_OUTPUT_BAM_MODE | QUP_INPUT_BAM_MODE)
  91 #define QUP_UNPACK_EN           BIT(14)
  92 #define QUP_PACK_EN             BIT(15)
  93
  94 #define QUP_REPACK_EN           (QUP_UNPACK_EN | QUP_PACK_EN)
  95 #define QUP_V2_TAGS_EN          1
  96
  97 #define QUP_OUTPUT_BLOCK_SIZE(x)(((x) >> 0) & 0x03)
  98 #define QUP_OUTPUT_FIFO_SIZE(x) (((x) >> 2) & 0x07)
  99 #define QUP_INPUT_BLOCK_SIZE(x) (((x) >> 5) & 0x03)
 100 #define QUP_INPUT_FIFO_SIZE(x)  (((x) >> 7) & 0x07)
 101
 102 /* QUP tags */
 103 #define QUP_TAG_START           (1 << 8)
 104 #define QUP_TAG_DATA            (2 << 8)
 105 #define QUP_TAG_STOP            (3 << 8)
 106 #define QUP_TAG_REC             (4 << 8)
 107 #define QUP_BAM_INPUT_EOT               0x93
 108 #define QUP_BAM_FLUSH_STOP              0x96
 109
 110 /* QUP v2 tags */
 111 #define QUP_TAG_V2_START               0x81
 112 #define QUP_TAG_V2_DATAWR              0x82
 113 #define QUP_TAG_V2_DATAWR_STOP         0x83
 114 #define QUP_TAG_V2_DATARD              0x85
 115 #define QUP_TAG_V2_DATARD_STOP         0x87
 116
 117 /* Status, Error flags */
 118 #define I2C_STATUS_WR_BUFFER_FULL       BIT(0)
 119 #define I2C_STATUS_BUS_ACTIVE           BIT(8)
 120 #define I2C_STATUS_ERROR_MASK           0x38000fc
 121 #define QUP_STATUS_ERROR_FLAGS          0x7c
 122
 123 #define QUP_READ_LIMIT                  256
 124 #define SET_BIT                         0x1
 125 #define RESET_BIT                       0x0
 126 #define ONE_BYTE                        0x1
 127 #define QUP_I2C_MX_CONFIG_DURING_RUN   BIT(31)
 128
 129 #define MX_TX_RX_LEN                    SZ_64K
 130 #define MX_BLOCKS                       (MX_TX_RX_LEN / QUP_READ_LIMIT)
 131
 132 /* Max timeout in ms for 32k bytes */
 133 #define TOUT_MAX                        300
 134
 135 struct qup_i2c_block {
 136         int     count;
 137         int     pos;
 138         int     tx_tag_len;
 139         int     rx_tag_len;
 140         int     data_len;
 141         u8      tags[6];
 142 };
 143
 144 struct qup_i2c_tag {
 145         u8 *start;
 146         dma_addr_t addr;
 147 };
 148
 149 struct qup_i2c_bam {
 150         struct  qup_i2c_tag tag;
 151         struct  dma_chan *dma;
 152         struct  scatterlist *sg;
 153 };
 154
 155 struct qup_i2c_dev {
 156         struct device           *dev;
 157         void __iomem            *base;
 158         int                     irq;
 159         struct clk              *clk;
 160         struct clk              *pclk;
 161         struct i2c_adapter      adap;
 162
 163         int                     clk_ctl;
 164         int                     out_fifo_sz;
 165         int                     in_fifo_sz;
 166         int                     out_blk_sz;
 167         int                     in_blk_sz;
 168
 169         unsigned long           one_byte_t;
 170         struct qup_i2c_block    blk;
 171
 172         struct i2c_msg          *msg;
 173         /* Current posion in user message buffer */
 174         int                     pos;
 175         /* I2C protocol errors */
 176         u32                     bus_err;
 177         /* QUP core errors */
 178         u32                     qup_err;
 179
 180         /* To check if this is the last msg */
 181         bool                    is_last;
 182
 183         /* To configure when bus is in run state */
 184         int                     config_run;
 185
 186         /* dma parameters */
 187         bool                    is_dma;
 188         struct                  dma_pool *dpool;
 189         struct                  qup_i2c_tag start_tag;
 190         struct                  qup_i2c_bam brx;
 191         struct                  qup_i2c_bam btx;
 192
 193         struct completion       xfer;
 194 };
 195
 196 static irqreturn_t qup_i2c_interrupt(int irq, void *dev)
 197 {
 198         struct qup_i2c_dev *qup = dev;
 199         u32 bus_err;
 200         u32 qup_err;
 201         u32 opflags;
 202
 203         bus_err = readl(qup->base + QUP_I2C_STATUS);
 204         qup_err = readl(qup->base + QUP_ERROR_FLAGS);
 205         opflags = readl(qup->base + QUP_OPERATIONAL);
 206
 207         if (!qup->msg) {
 208                 /* Clear Error interrupt */
 209                 writel(QUP_RESET_STATE, qup->base + QUP_STATE);
 210                 return IRQ_HANDLED;
 211         }
 212
 213         bus_err &= I2C_STATUS_ERROR_MASK;
 214         qup_err &= QUP_STATUS_ERROR_FLAGS;
 215
 216         /* Clear the error bits in QUP_ERROR_FLAGS */
 217         if (qup_err)
 218                 writel(qup_err, qup->base + QUP_ERROR_FLAGS);
 219
 220         /* Clear the error bits in QUP_I2C_STATUS */
 221         if (bus_err)
 222                 writel(bus_err, qup->base + QUP_I2C_STATUS);
 223
 224         /* Reset the QUP State in case of error */
 225         if (qup_err || bus_err) {
 226                 writel(QUP_RESET_STATE, qup->base + QUP_STATE);
 227                 goto done;
 228         }
 229
 230         if (opflags & QUP_IN_SVC_FLAG)
 231                 writel(QUP_IN_SVC_FLAG, qup->base + QUP_OPERATIONAL);
 232
 233         if (opflags & QUP_OUT_SVC_FLAG)
 234                 writel(QUP_OUT_SVC_FLAG, qup->base + QUP_OPERATIONAL);
 235
 236 done:
 237         qup->qup_err = qup_err;
 238         qup->bus_err = bus_err;
 239         complete(&qup->xfer);
 240         return IRQ_HANDLED;
 241 }
 242
 243 static int qup_i2c_poll_state_mask(struct qup_i2c_dev *qup,
 244                                    u32 req_state, u32 req_mask)
 245 {
 246         int retries = 1;
 247         u32 state;
 248
 249         /*
 250          * State transition takes 3 AHB clocks cycles + 3 I2C master clock
 251          * cycles. So retry once after a 1uS delay.
 252          */
 253         do {
 254                 state = readl(qup->base + QUP_STATE);
 255
 256                 if (state & QUP_STATE_VALID &&
 257                     (state & req_mask) == req_state)
 258                         return 0;
 259
 260                 udelay(1);
 261         } while (retries--);
 262
 263         return -ETIMEDOUT;
 264 }
 265
 266 static int qup_i2c_poll_state(struct qup_i2c_dev *qup, u32 req_state)
 267 {
 268         return qup_i2c_poll_state_mask(qup, req_state, QUP_STATE_MASK);
 269 }
 270
 271 static void qup_i2c_flush(struct qup_i2c_dev *qup)
 272 {
 273         u32 val = readl(qup->base + QUP_STATE);
 274
 275         val |= QUP_I2C_FLUSH;
 276         writel(val, qup->base + QUP_STATE);
 277 }
 278
 279 static int qup_i2c_poll_state_valid(struct qup_i2c_dev *qup)
 280 {
 281         return qup_i2c_poll_state_mask(qup, 0, 0);
 282 }
 283
 284 static int qup_i2c_poll_state_i2c_master(struct qup_i2c_dev *qup)
 285 {
 286         return qup_i2c_poll_state_mask(qup, QUP_I2C_MAST_GEN, QUP_I2C_MAST_GEN);
 287 }
 288
 289 static int qup_i2c_change_state(struct qup_i2c_dev *qup, u32 state)
 290 {
 291         if (qup_i2c_poll_state_valid(qup) != 0)
 292                 return -EIO;
 293
 294         writel(state, qup->base + QUP_STATE);
 295
 296         if (qup_i2c_poll_state(qup, state) != 0)
 297                 return -EIO;
 298         return 0;
 299 }
 300
 301 /**
 302  * qup_i2c_wait_ready - wait for a give number of bytes in tx/rx path
 303  * @qup: The qup_i2c_dev device
 304  * @op: The bit/event to wait on
 305  * @val: value of the bit to wait on, 0 or 1
 306  * @len: The length the bytes to be transferred
 307  */
 308 static int qup_i2c_wait_ready(struct qup_i2c_dev *qup, int op, bool val,
 309                               int len)
 310 {
 311         unsigned long timeout;
 312         u32 opflags;
 313         u32 status;
 314         u32 shift = __ffs(op);
 315         int ret = 0;
 316
 317         len *= qup->one_byte_t;
 318         /* timeout after a wait of twice the max time */
 319         timeout = jiffies + len * 4;
 320
 321         for (;;) {
 322                 opflags = readl(qup->base + QUP_OPERATIONAL);
 323                 status = readl(qup->base + QUP_I2C_STATUS);
 324
 325                 if (((opflags & op) >> shift) == val) {
 326                         if ((op == QUP_OUT_NOT_EMPTY) && qup->is_last) {
 327                                 if (!(status & I2C_STATUS_BUS_ACTIVE)) {
 328                                         ret = 0;
 329                                         goto done;
 330                                 }
 331                         } else {
 332                                 ret = 0;
 333                                 goto done;
 334                         }
 335                 }
 336
 337                 if (time_after(jiffies, timeout)) {
 338                         ret = -ETIMEDOUT;
 339                         goto done;
 340                 }
 341                 usleep_range(len, len * 2);
 342         }
 343
 344 done:
 345         if (qup->bus_err || qup->qup_err)
 346                 ret =  (qup->bus_err & QUP_I2C_NACK_FLAG) ? -ENXIO : -EIO;
 347
 348         return ret;
 349 }
 350
 351 static void qup_i2c_set_write_mode_v2(struct qup_i2c_dev *qup,
 352                                       struct i2c_msg *msg)
 353 {
 354         /* Number of entries to shift out, including the tags */
 355         int total = msg->len + qup->blk.tx_tag_len;
 356
 357         total |= qup->config_run;
 358
 359         if (total < qup->out_fifo_sz) {
 360                 /* FIFO mode */
 361                 writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE);
 362                 writel(total, qup->base + QUP_MX_WRITE_CNT);
 363         } else {
 364                 /* BLOCK mode (transfer data on chunks) */
 365                 writel(QUP_OUTPUT_BLK_MODE | QUP_REPACK_EN,
 366                        qup->base + QUP_IO_MODE);
 367                 writel(total, qup->base + QUP_MX_OUTPUT_CNT);
 368         }
 369 }
 370
 371 static void qup_i2c_set_write_mode(struct qup_i2c_dev *qup, struct i2c_msg *msg)
 372 {
 373         /* Number of entries to shift out, including the start */
 374         int total = msg->len + 1;
 375
 376         if (total < qup->out_fifo_sz) {
 377                 /* FIFO mode */
 378                 writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE);
 379                 writel(total, qup->base + QUP_MX_WRITE_CNT);
 380         } else {
 381                 /* BLOCK mode (transfer data on chunks) */
 382                 writel(QUP_OUTPUT_BLK_MODE | QUP_REPACK_EN,
 383                        qup->base + QUP_IO_MODE);
 384                 writel(total, qup->base + QUP_MX_OUTPUT_CNT);
 385         }
 386 }
 387
 388 static int check_for_fifo_space(struct qup_i2c_dev *qup)
 389 {
 390         int ret;
 391
 392         ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
 393         if (ret)
 394                 goto out;
 395
 396         ret = qup_i2c_wait_ready(qup, QUP_OUT_FULL,
 397                                  RESET_BIT, 4 * ONE_BYTE);
 398         if (ret) {
 399                 /* Fifo is full. Drain out the fifo */
 400                 ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 401                 if (ret)
 402                         goto out;
 403
 404                 ret = qup_i2c_wait_ready(qup, QUP_OUT_NOT_EMPTY,
 405                                          RESET_BIT, 256 * ONE_BYTE);
 406                 if (ret) {
 407                         dev_err(qup->dev, "timeout for fifo out full");
 408                         goto out;
 409                 }
 410
 411                 ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
 412                 if (ret)
 413                         goto out;
 414         }
 415
 416 out:
 417         return ret;
 418 }
 419
 420 static int qup_i2c_issue_write(struct qup_i2c_dev *qup, struct i2c_msg *msg)
 421 {
 422         u32 addr = msg->addr << 1;
 423         u32 qup_tag;
 424         int idx;
 425         u32 val;
 426         int ret = 0;
 427
 428         if (qup->pos == 0) {
 429                 val = QUP_TAG_START | addr;
 430                 idx = 1;
 431         } else {
 432                 val = 0;
 433                 idx = 0;
 434         }
 435
 436         while (qup->pos < msg->len) {
 437                 /* Check that there's space in the FIFO for our pair */
 438                 ret = check_for_fifo_space(qup);
 439                 if (ret)
 440                         return ret;
 441
 442                 if (qup->pos == msg->len - 1)
 443                         qup_tag = QUP_TAG_STOP;
 444                 else
 445                         qup_tag = QUP_TAG_DATA;
 446
 447                 if (idx & 1)
 448                         val |= (qup_tag | msg->buf[qup->pos]) << QUP_MSW_SHIFT;
 449                 else
 450                         val = qup_tag | msg->buf[qup->pos];
 451
 452                 /* Write out the pair and the last odd value */
 453                 if (idx & 1 || qup->pos == msg->len - 1)
 454                         writel(val, qup->base + QUP_OUT_FIFO_BASE);
 455
 456                 qup->pos++;
 457                 idx++;
 458         }
 459
 460         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 461
 462         return ret;
 463 }
 464
 465 static void qup_i2c_set_blk_data(struct qup_i2c_dev *qup,
 466                                  struct i2c_msg *msg)
 467 {
 468         memset(&qup->blk, 0, sizeof(qup->blk));
 469
 470         qup->blk.data_len = msg->len;
 471         qup->blk.count = (msg->len + QUP_READ_LIMIT - 1) / QUP_READ_LIMIT;
 472
 473         /* 4 bytes for first block and 2 writes for rest */
 474         qup->blk.tx_tag_len = 4 + (qup->blk.count - 1) * 2;
 475
 476         /* There are 2 tag bytes that are read in to fifo for every block */
 477         if (msg->flags & I2C_M_RD)
 478                 qup->blk.rx_tag_len = qup->blk.count * 2;
 479 }
 480
 481 static int qup_i2c_send_data(struct qup_i2c_dev *qup, int tlen, u8 *tbuf,
 482                              int dlen, u8 *dbuf)
 483 {
 484         u32 val = 0, idx = 0, pos = 0, i = 0, t;
 485         int  len = tlen + dlen;
 486         u8 *buf = tbuf;
 487         int ret = 0;
 488
 489         while (len > 0) {
 490                 ret = check_for_fifo_space(qup);
 491                 if (ret)
 492                         return ret;
 493
 494                 t = (len >= 4) ? 4 : len;
 495
 496                 while (idx < t) {
 497                         if (!i && (pos >= tlen)) {
 498                                 buf = dbuf;
 499                                 pos = 0;
 500                                 i = 1;
 501                         }
 502                         val |= buf[pos++] << (idx++ * 8);
 503                 }
 504
 505                 writel(val, qup->base + QUP_OUT_FIFO_BASE);
 506                 idx  = 0;
 507                 val = 0;
 508                 len -= 4;
 509         }
 510
 511         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 512
 513         return ret;
 514 }
 515
 516 static int qup_i2c_get_data_len(struct qup_i2c_dev *qup)
 517 {
 518         int data_len;
 519
 520         if (qup->blk.data_len > QUP_READ_LIMIT)
 521                 data_len = QUP_READ_LIMIT;
 522         else
 523                 data_len = qup->blk.data_len;
 524
 525         return data_len;
 526 }
 527
 528 static int qup_i2c_set_tags(u8 *tags, struct qup_i2c_dev *qup,
 529                             struct i2c_msg *msg,  int is_dma)
 530 {
 531         u16 addr = i2c_8bit_addr_from_msg(msg);
 532         int len = 0;
 533         int data_len;
 534
 535         int last = (qup->blk.pos == (qup->blk.count - 1)) && (qup->is_last);
 536
 537         if (qup->blk.pos == 0) {
 538                 tags[len++] = QUP_TAG_V2_START;
 539                 tags[len++] = addr & 0xff;
 540
 541                 if (msg->flags & I2C_M_TEN)
 542                         tags[len++] = addr >> 8;
 543         }
 544
 545         /* Send _STOP commands for the last block */
 546         if (last) {
 547                 if (msg->flags & I2C_M_RD)
 548                         tags[len++] = QUP_TAG_V2_DATARD_STOP;
 549                 else
 550                         tags[len++] = QUP_TAG_V2_DATAWR_STOP;
 551         } else {
 552                 if (msg->flags & I2C_M_RD)
 553                         tags[len++] = QUP_TAG_V2_DATARD;
 554                 else
 555                         tags[len++] = QUP_TAG_V2_DATAWR;
 556         }
 557
 558         data_len = qup_i2c_get_data_len(qup);
 559
 560         /* 0 implies 256 bytes */
 561         if (data_len == QUP_READ_LIMIT)
 562                 tags[len++] = 0;
 563         else
 564                 tags[len++] = data_len;
 565
 566         if ((msg->flags & I2C_M_RD) && last && is_dma) {
 567                 tags[len++] = QUP_BAM_INPUT_EOT;
 568                 tags[len++] = QUP_BAM_FLUSH_STOP;
 569         }
 570
 571         return len;
 572 }
 573
 574 static int qup_i2c_issue_xfer_v2(struct qup_i2c_dev *qup, struct i2c_msg *msg)
 575 {
 576         int data_len = 0, tag_len, index;
 577         int ret;
 578
 579         tag_len = qup_i2c_set_tags(qup->blk.tags, qup, msg, 0);
 580         index = msg->len - qup->blk.data_len;
 581
 582         /* only tags are written for read */
 583         if (!(msg->flags & I2C_M_RD))
 584                 data_len = qup_i2c_get_data_len(qup);
 585
 586         ret = qup_i2c_send_data(qup, tag_len, qup->blk.tags,
 587                                 data_len, &msg->buf[index]);
 588         qup->blk.data_len -= data_len;
 589
 590         return ret;
 591 }
 592
 593 static void qup_i2c_bam_cb(void *data)
 594 {
 595         struct qup_i2c_dev *qup = data;
 596
 597         complete(&qup->xfer);
 598 }
 599
 600 static int qup_sg_set_buf(struct scatterlist *sg, void *buf,
 601                           unsigned int buflen, struct qup_i2c_dev *qup,
 602                           int dir)
 603 {
 604         int ret;
 605
 606         sg_set_buf(sg, buf, buflen);
 607         ret = dma_map_sg(qup->dev, sg, 1, dir);
 608         if (!ret)
 609                 return -EINVAL;
 610
 611         return 0;
 612 }
 613
 614 static void qup_i2c_rel_dma(struct qup_i2c_dev *qup)
 615 {
 616         if (qup->btx.dma)
 617                 dma_release_channel(qup->btx.dma);
 618         if (qup->brx.dma)
 619                 dma_release_channel(qup->brx.dma);
 620         qup->btx.dma = NULL;
 621         qup->brx.dma = NULL;
 622 }
 623
 624 static int qup_i2c_req_dma(struct qup_i2c_dev *qup)
 625 {
 626         int err;
 627
 628         if (!qup->btx.dma) {
 629                 qup->btx.dma = dma_request_slave_channel_reason(qup->dev, "tx");
 630                 if (IS_ERR(qup->btx.dma)) {
 631                         err = PTR_ERR(qup->btx.dma);
 632                         qup->btx.dma = NULL;
 633                         dev_err(qup->dev, "\n tx channel not available");
 634                         return err;
 635                 }
 636         }
 637
 638         if (!qup->brx.dma) {
 639                 qup->brx.dma = dma_request_slave_channel_reason(qup->dev, "rx");
 640                 if (IS_ERR(qup->brx.dma)) {
 641                         dev_err(qup->dev, "\n rx channel not available");
 642                         err = PTR_ERR(qup->brx.dma);
 643                         qup->brx.dma = NULL;
 644                         qup_i2c_rel_dma(qup);
 645                         return err;
 646                 }
 647         }
 648         return 0;
 649 }
 650
 651 static int qup_i2c_bam_do_xfer(struct qup_i2c_dev *qup, struct i2c_msg *msg,
 652                                int num)
 653 {
 654         struct dma_async_tx_descriptor *txd, *rxd = NULL;
 655         int ret = 0, idx = 0, limit = QUP_READ_LIMIT;
 656         dma_cookie_t cookie_rx, cookie_tx;
 657         u32 rx_nents = 0, tx_nents = 0, len, blocks, rem;
 658         u32 i, tlen, tx_len, tx_buf = 0, rx_buf = 0, off = 0;
 659         u8 *tags;
 660
 661         while (idx < num) {
 662                 tx_len = 0, len = 0, i = 0;
 663
 664                 qup->is_last = (idx == (num - 1));
 665
 666                 qup_i2c_set_blk_data(qup, msg);
 667
 668                 blocks = qup->blk.count;
 669                 rem = msg->len - (blocks - 1) * limit;
 670
 671                 if (msg->flags & I2C_M_RD) {
 672                         rx_nents += (blocks * 2) + 1;
 673                         tx_nents += 1;
 674
 675                         while (qup->blk.pos < blocks) {
 676                                 tlen = (i == (blocks - 1)) ? rem : limit;
 677                                 tags = &qup->start_tag.start[off + len];
 678                                 len += qup_i2c_set_tags(tags, qup, msg, 1);
 679                                 qup->blk.data_len -= tlen;
 680
 681                                 /* scratch buf to read the start and len tags */
 682                                 ret = qup_sg_set_buf(&qup->brx.sg[rx_buf++],
 683                                                      &qup->brx.tag.start[0],
 684                                                      2, qup, DMA_FROM_DEVICE);
 685
 686                                 if (ret)
 687                                         return ret;
 688
 689                                 ret = qup_sg_set_buf(&qup->brx.sg[rx_buf++],
 690                                                      &msg->buf[limit * i],
 691                                                      tlen, qup,
 692                                                      DMA_FROM_DEVICE);
 693                                 if (ret)
 694                                         return ret;
 695
 696                                 i++;
 697                                 qup->blk.pos = i;
 698                         }
 699                         ret = qup_sg_set_buf(&qup->btx.sg[tx_buf++],
 700                                              &qup->start_tag.start[off],
 701                                              len, qup, DMA_TO_DEVICE);
 702                         if (ret)
 703                                 return ret;
 704
 705                         off += len;
 706                         /* scratch buf to read the BAM EOT and FLUSH tags */
 707                         ret = qup_sg_set_buf(&qup->brx.sg[rx_buf++],
 708                                              &qup->brx.tag.start[0],
 709                                              2, qup, DMA_FROM_DEVICE);
 710                         if (ret)
 711                                 return ret;
 712                 } else {
 713                         tx_nents += (blocks * 2);
 714
 715                         while (qup->blk.pos < blocks) {
 716                                 tlen = (i == (blocks - 1)) ? rem : limit;
 717                                 tags = &qup->start_tag.start[off + tx_len];
 718                                 len = qup_i2c_set_tags(tags, qup, msg, 1);
 719                                 qup->blk.data_len -= tlen;
 720
 721                                 ret = qup_sg_set_buf(&qup->btx.sg[tx_buf++],
 722                                                      tags, len,
 723                                                      qup, DMA_TO_DEVICE);
 724                                 if (ret)
 725                                         return ret;
 726
 727                                 tx_len += len;
 728                                 ret = qup_sg_set_buf(&qup->btx.sg[tx_buf++],
 729                                                      &msg->buf[limit * i],
 730                                                      tlen, qup, DMA_TO_DEVICE);
 731                                 if (ret)
 732                                         return ret;
 733                                 i++;
 734                                 qup->blk.pos = i;
 735                         }
 736                         off += tx_len;
 737
 738                         if (idx == (num - 1)) {
 739                                 len = 1;
 740                                 if (rx_nents) {
 741                                         qup->btx.tag.start[0] =
 742                                                         QUP_BAM_INPUT_EOT;
 743                                         len++;
 744                                 }
 745                                 qup->btx.tag.start[len - 1] =
 746                                                         QUP_BAM_FLUSH_STOP;
 747                                 ret = qup_sg_set_buf(&qup->btx.sg[tx_buf++],
 748                                                      &qup->btx.tag.start[0],
 749                                                      len, qup, DMA_TO_DEVICE);
 750                                 if (ret)
 751                                         return ret;
 752                                 tx_nents += 1;
 753                         }
 754                 }
 755                 idx++;
 756                 msg++;
 757         }
 758
 759         txd = dmaengine_prep_slave_sg(qup->btx.dma, qup->btx.sg, tx_nents,
 760                                       DMA_MEM_TO_DEV,
 761                                       DMA_PREP_INTERRUPT | DMA_PREP_FENCE);
 762         if (!txd) {
 763                 dev_err(qup->dev, "failed to get tx desc\n");
 764                 ret = -EINVAL;
 765                 goto desc_err;
 766         }
 767
 768         if (!rx_nents) {
 769                 txd->callback = qup_i2c_bam_cb;
 770                 txd->callback_param = qup;
 771         }
 772
 773         cookie_tx = dmaengine_submit(txd);
 774         if (dma_submit_error(cookie_tx)) {
 775                 ret = -EINVAL;
 776                 goto desc_err;
 777         }
 778
 779         dma_async_issue_pending(qup->btx.dma);
 780
 781         if (rx_nents) {
 782                 rxd = dmaengine_prep_slave_sg(qup->brx.dma, qup->brx.sg,
 783                                               rx_nents, DMA_DEV_TO_MEM,
 784                                               DMA_PREP_INTERRUPT);
 785                 if (!rxd) {
 786                         dev_err(qup->dev, "failed to get rx desc\n");
 787                         ret = -EINVAL;
 788
 789                         /* abort TX descriptors */
 790                         dmaengine_terminate_all(qup->btx.dma);
 791                         goto desc_err;
 792                 }
 793
 794                 rxd->callback = qup_i2c_bam_cb;
 795                 rxd->callback_param = qup;
 796                 cookie_rx = dmaengine_submit(rxd);
 797                 if (dma_submit_error(cookie_rx)) {
 798                         ret = -EINVAL;
 799                         goto desc_err;
 800                 }
 801
 802                 dma_async_issue_pending(qup->brx.dma);
 803         }
 804
 805         if (!wait_for_completion_timeout(&qup->xfer, TOUT_MAX * HZ)) {
 806                 dev_err(qup->dev, "normal trans timed out\n");
 807                 ret = -ETIMEDOUT;
 808         }
 809
 810         if (ret || qup->bus_err || qup->qup_err) {
 811                 if (qup_i2c_change_state(qup, QUP_RUN_STATE)) {
 812                         dev_err(qup->dev, "change to run state timed out");
 813                         goto desc_err;
 814                 }
 815
 816                 if (rx_nents)
 817                         writel(QUP_BAM_INPUT_EOT,
 818                                qup->base + QUP_OUT_FIFO_BASE);
 819
 820                 writel(QUP_BAM_FLUSH_STOP, qup->base + QUP_OUT_FIFO_BASE);
 821
 822                 qup_i2c_flush(qup);
 823
 824                 /* wait for remaining interrupts to occur */
 825                 if (!wait_for_completion_timeout(&qup->xfer, HZ))
 826                         dev_err(qup->dev, "flush timed out\n");
 827
 828                 qup_i2c_rel_dma(qup);
 829
 830                 ret =  (qup->bus_err & QUP_I2C_NACK_FLAG) ? -ENXIO : -EIO;
 831         }
 832
 833 desc_err:
 834         dma_unmap_sg(qup->dev, qup->btx.sg, tx_nents, DMA_TO_DEVICE);
 835
 836         if (rx_nents)
 837                 dma_unmap_sg(qup->dev, qup->brx.sg, rx_nents,
 838                              DMA_FROM_DEVICE);
 839
 840         return ret;
 841 }
 842
 843 static int qup_i2c_bam_xfer(struct i2c_adapter *adap, struct i2c_msg *msg,
 844                             int num)
 845 {
 846         struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
 847         int ret = 0;
 848
 849         enable_irq(qup->irq);
 850         ret = qup_i2c_req_dma(qup);
 851
 852         if (ret)
 853                 goto out;
 854
 855         writel(0, qup->base + QUP_MX_INPUT_CNT);
 856         writel(0, qup->base + QUP_MX_OUTPUT_CNT);
 857
 858         /* set BAM mode */
 859         writel(QUP_REPACK_EN | QUP_BAM_MODE, qup->base + QUP_IO_MODE);
 860
 861         /* mask fifo irqs */
 862         writel((0x3 << 8), qup->base + QUP_OPERATIONAL_MASK);
 863
 864         /* set RUN STATE */
 865         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 866         if (ret)
 867                 goto out;
 868
 869         writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);
 870
 871         qup->msg = msg;
 872         ret = qup_i2c_bam_do_xfer(qup, qup->msg, num);
 873 out:
 874         disable_irq(qup->irq);
 875
 876         qup->msg = NULL;
 877         return ret;
 878 }
 879
 880 static int qup_i2c_wait_for_complete(struct qup_i2c_dev *qup,
 881                                      struct i2c_msg *msg)
 882 {
 883         unsigned long left;
 884         int ret = 0;
 885
 886         left = wait_for_completion_timeout(&qup->xfer, HZ);
 887         if (!left) {
 888                 writel(1, qup->base + QUP_SW_RESET);
 889                 ret = -ETIMEDOUT;
 890         }
 891
 892         if (qup->bus_err || qup->qup_err)
 893                 ret =  (qup->bus_err & QUP_I2C_NACK_FLAG) ? -ENXIO : -EIO;
 894
 895         return ret;
 896 }
 897
 898 static int qup_i2c_write_one_v2(struct qup_i2c_dev *qup, struct i2c_msg *msg)
 899 {
 900         int ret = 0;
 901
 902         qup->msg = msg;
 903         qup->pos = 0;
 904         enable_irq(qup->irq);
 905         qup_i2c_set_blk_data(qup, msg);
 906         qup_i2c_set_write_mode_v2(qup, msg);
 907
 908         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 909         if (ret)
 910                 goto err;
 911
 912         writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);
 913
 914         do {
 915                 ret = qup_i2c_issue_xfer_v2(qup, msg);
 916                 if (ret)
 917                         goto err;
 918
 919                 ret = qup_i2c_wait_for_complete(qup, msg);
 920                 if (ret)
 921                         goto err;
 922
 923                 qup->blk.pos++;
 924         } while (qup->blk.pos < qup->blk.count);
 925
 926         ret = qup_i2c_wait_ready(qup, QUP_OUT_NOT_EMPTY, RESET_BIT, ONE_BYTE);
 927
 928 err:
 929         disable_irq(qup->irq);
 930         qup->msg = NULL;
 931
 932         return ret;
 933 }
 934
 935 static int qup_i2c_write_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
 936 {
 937         int ret;
 938
 939         qup->msg = msg;
 940         qup->pos = 0;
 941
 942         enable_irq(qup->irq);
 943
 944         qup_i2c_set_write_mode(qup, msg);
 945
 946         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 947         if (ret)
 948                 goto err;
 949
 950         writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);
 951
 952         do {
 953                 ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
 954                 if (ret)
 955                         goto err;
 956
 957                 ret = qup_i2c_issue_write(qup, msg);
 958                 if (ret)
 959                         goto err;
 960
 961                 ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 962                 if (ret)
 963                         goto err;
 964
 965                 ret = qup_i2c_wait_for_complete(qup, msg);
 966                 if (ret)
 967                         goto err;
 968         } while (qup->pos < msg->len);
 969
 970         /* Wait for the outstanding data in the fifo to drain */
 971         ret = qup_i2c_wait_ready(qup, QUP_OUT_NOT_EMPTY, RESET_BIT, ONE_BYTE);
 972 err:
 973         disable_irq(qup->irq);
 974         qup->msg = NULL;
 975
 976         return ret;
 977 }
 978
 979 static void qup_i2c_set_read_mode(struct qup_i2c_dev *qup, int len)
 980 {
 981         if (len < qup->in_fifo_sz) {
 982                 /* FIFO mode */
 983                 writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE);
 984                 writel(len, qup->base + QUP_MX_READ_CNT);
 985         } else {
 986                 /* BLOCK mode (transfer data on chunks) */
 987                 writel(QUP_INPUT_BLK_MODE | QUP_REPACK_EN,
 988                        qup->base + QUP_IO_MODE);
 989                 writel(len, qup->base + QUP_MX_INPUT_CNT);
 990         }
 991 }
 992
 993 static void qup_i2c_set_read_mode_v2(struct qup_i2c_dev *qup, int len)
 994 {
 995         int tx_len = qup->blk.tx_tag_len;
 996
 997         len += qup->blk.rx_tag_len;
 998         len |= qup->config_run;
 999         tx_len |= qup->config_run;
1000
1001         if (len < qup->in_fifo_sz) {
1002                 /* FIFO mode */
1003                 writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE);
1004                 writel(tx_len, qup->base + QUP_MX_WRITE_CNT);
1005                 writel(len, qup->base + QUP_MX_READ_CNT);
1006         } else {
1007                 /* BLOCK mode (transfer data on chunks) */
1008                 writel(QUP_INPUT_BLK_MODE | QUP_REPACK_EN,
1009                        qup->base + QUP_IO_MODE);
1010                 writel(tx_len, qup->base + QUP_MX_OUTPUT_CNT);
1011                 writel(len, qup->base + QUP_MX_INPUT_CNT);
1012         }
1013 }
1014
1015 static void qup_i2c_issue_read(struct qup_i2c_dev *qup, struct i2c_msg *msg)
1016 {
1017         u32 addr, len, val;
1018
1019         addr = i2c_8bit_addr_from_msg(msg);
1020
1021         /* 0 is used to specify a length 256 (QUP_READ_LIMIT) */
1022         len = (msg->len == QUP_READ_LIMIT) ? 0 : msg->len;
1023
1024         val = ((QUP_TAG_REC | len) << QUP_MSW_SHIFT) | QUP_TAG_START | addr;
1025         writel(val, qup->base + QUP_OUT_FIFO_BASE);
1026 }
1027
1028
1029 static int qup_i2c_read_fifo(struct qup_i2c_dev *qup, struct i2c_msg *msg)
1030 {
1031         u32 val = 0;
1032         int idx;
1033         int ret = 0;
1034
1035         for (idx = 0; qup->pos < msg->len; idx++) {
1036                 if ((idx & 1) == 0) {
1037                         /* Check that FIFO have data */
1038                         ret = qup_i2c_wait_ready(qup, QUP_IN_NOT_EMPTY,
1039                                                  SET_BIT, 4 * ONE_BYTE);
1040                         if (ret)
1041                                 return ret;
1042
1043                         /* Reading 2 words at time */
1044                         val = readl(qup->base + QUP_IN_FIFO_BASE);
1045
1046                         msg->buf[qup->pos++] = val & 0xFF;
1047                 } else {
1048                         msg->buf[qup->pos++] = val >> QUP_MSW_SHIFT;
1049                 }
1050         }
1051
1052         return ret;
1053 }
1054
1055 static int qup_i2c_read_fifo_v2(struct qup_i2c_dev *qup,
1056                                 struct i2c_msg *msg)
1057 {
1058         u32 val;
1059         int idx, pos = 0, ret = 0, total;
1060
1061         total = qup_i2c_get_data_len(qup);
1062
1063         /* 2 extra bytes for read tags */
1064         while (pos < (total + 2)) {
1065                 /* Check that FIFO have data */
1066                 ret = qup_i2c_wait_ready(qup, QUP_IN_NOT_EMPTY,
1067                                          SET_BIT, 4 * ONE_BYTE);
1068                 if (ret) {
1069                         dev_err(qup->dev, "timeout for fifo not empty");
1070                         return ret;
1071                 }
1072                 val = readl(qup->base + QUP_IN_FIFO_BASE);
1073
1074                 for (idx = 0; idx < 4; idx++, val >>= 8, pos++) {
1075                         /* first 2 bytes are tag bytes */
1076                         if (pos < 2)
1077                                 continue;
1078
1079                         if (pos >= (total + 2))
1080                                 goto out;
1081
1082                         msg->buf[qup->pos++] = val & 0xff;
1083                 }
1084         }
1085
1086 out:
1087         qup->blk.data_len -= total;
1088
1089         return ret;
1090 }
1091
1092 static int qup_i2c_read_one_v2(struct qup_i2c_dev *qup, struct i2c_msg *msg)
1093 {
1094         int ret = 0;
1095
1096         qup->msg = msg;
1097         qup->pos  = 0;
1098         enable_irq(qup->irq);
1099         qup_i2c_set_blk_data(qup, msg);
1100         qup_i2c_set_read_mode_v2(qup, msg->len);
1101
1102         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
1103         if (ret)
1104                 goto err;
1105
1106         writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);
1107
1108         do {
1109                 ret = qup_i2c_issue_xfer_v2(qup, msg);
1110                 if (ret)
1111                         goto err;
1112
1113                 ret = qup_i2c_wait_for_complete(qup, msg);
1114                 if (ret)
1115                         goto err;
1116
1117                 ret = qup_i2c_read_fifo_v2(qup, msg);
1118                 if (ret)
1119                         goto err;
1120
1121                 qup->blk.pos++;
1122         } while (qup->blk.pos < qup->blk.count);
1123
1124 err:
1125         disable_irq(qup->irq);
1126         qup->msg = NULL;
1127
1128         return ret;
1129 }
1130
1131 static int qup_i2c_read_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
1132 {
1133         int ret;
1134
1135         qup->msg = msg;
1136         qup->pos  = 0;
1137
1138         enable_irq(qup->irq);
1139         qup_i2c_set_read_mode(qup, msg->len);
1140
1141         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
1142         if (ret)
1143                 goto err;
1144
1145         writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);
1146
1147         ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
1148         if (ret)
1149                 goto err;
1150
1151         qup_i2c_issue_read(qup, msg);
1152
1153         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
1154         if (ret)
1155                 goto err;
1156
1157         do {
1158                 ret = qup_i2c_wait_for_complete(qup, msg);
1159                 if (ret)
1160                         goto err;
1161
1162                 ret = qup_i2c_read_fifo(qup, msg);
1163                 if (ret)
1164                         goto err;
1165         } while (qup->pos < msg->len);
1166
1167 err:
1168         disable_irq(qup->irq);
1169         qup->msg = NULL;
1170
1171         return ret;
1172 }
1173
1174 static int qup_i2c_xfer(struct i2c_adapter *adap,
1175                         struct i2c_msg msgs[],
1176                         int num)
1177 {
1178         struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
1179         int ret, idx;
1180
1181         ret = pm_runtime_get_sync(qup->dev);
1182         if (ret < 0)
1183                 goto out;
1184
1185         qup->bus_err = 0;
1186         qup->qup_err = 0;
1187
1188         writel(1, qup->base + QUP_SW_RESET);
1189         ret = qup_i2c_poll_state(qup, QUP_RESET_STATE);
1190         if (ret)
1191                 goto out;
1192
1193         /* Configure QUP as I2C mini core */
1194         writel(I2C_MINI_CORE | I2C_N_VAL, qup->base + QUP_CONFIG);
1195
1196         for (idx = 0; idx < num; idx++) {
1197                 if (msgs[idx].len == 0) {
1198                         ret = -EINVAL;
1199                         goto out;
1200                 }
1201
1202                 if (qup_i2c_poll_state_i2c_master(qup)) {
1203                         ret = -EIO;
1204                         goto out;
1205                 }
1206
1207                 if (msgs[idx].flags & I2C_M_RD)
1208                         ret = qup_i2c_read_one(qup, &msgs[idx]);
1209                 else
1210                         ret = qup_i2c_write_one(qup, &msgs[idx]);
1211
1212                 if (ret)
1213                         break;
1214
1215                 ret = qup_i2c_change_state(qup, QUP_RESET_STATE);
1216                 if (ret)
1217                         break;
1218         }
1219
1220         if (ret == 0)
1221                 ret = num;
1222 out:
1223
1224         pm_runtime_mark_last_busy(qup->dev);
1225         pm_runtime_put_autosuspend(qup->dev);
1226
1227         return ret;
1228 }
1229
1230 static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
1231                            struct i2c_msg msgs[],
1232                            int num)
1233 {
1234         struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
1235         int ret, len, idx = 0, use_dma = 0;
1236
1237         qup->bus_err = 0;
1238         qup->qup_err = 0;
1239
1240         ret = pm_runtime_get_sync(qup->dev);
1241         if (ret < 0)
1242                 goto out;
1243
1244         writel(1, qup->base + QUP_SW_RESET);
1245         ret = qup_i2c_poll_state(qup, QUP_RESET_STATE);
1246         if (ret)
1247                 goto out;
1248
1249         /* Configure QUP as I2C mini core */
1250         writel(I2C_MINI_CORE | I2C_N_VAL_V2, qup->base + QUP_CONFIG);
1251         writel(QUP_V2_TAGS_EN, qup->base + QUP_I2C_MASTER_GEN);
1252
1253         if ((qup->is_dma)) {
1254                 /* All i2c_msgs should be transferred using either dma or cpu */
1255                 for (idx = 0; idx < num; idx++) {
1256                         if (msgs[idx].len == 0) {
1257                                 ret = -EINVAL;
1258                                 goto out;
1259                         }
1260
1261                         len = (msgs[idx].len > qup->out_fifo_sz) ||
1262                               (msgs[idx].len > qup->in_fifo_sz);
1263
1264                         if ((!is_vmalloc_addr(msgs[idx].buf)) && len) {
1265                                 use_dma = 1;
1266                          } else {
1267                                 use_dma = 0;
1268                                 break;
1269                         }
1270                 }
1271         }
1272
1273         idx = 0;
1274
1275         do {
1276                 if (msgs[idx].len == 0) {
1277                         ret = -EINVAL;
1278                         goto out;
1279                 }
1280
1281                 if (qup_i2c_poll_state_i2c_master(qup)) {
1282                         ret = -EIO;
1283                         goto out;
1284                 }
1285
1286                 qup->is_last = (idx == (num - 1));
1287                 if (idx)
1288                         qup->config_run = QUP_I2C_MX_CONFIG_DURING_RUN;
1289                 else
1290                         qup->config_run = 0;
1291
1292                 reinit_completion(&qup->xfer);
1293
1294                 if (use_dma) {
1295                         ret = qup_i2c_bam_xfer(adap, &msgs[idx], num);
1296                 } else {
1297                         if (msgs[idx].flags & I2C_M_RD)
1298                                 ret = qup_i2c_read_one_v2(qup, &msgs[idx]);
1299                         else
1300                                 ret = qup_i2c_write_one_v2(qup, &msgs[idx]);
1301                 }
1302         } while ((idx++ < (num - 1)) && !use_dma && !ret);
1303
1304         if (!ret)
1305                 ret = qup_i2c_change_state(qup, QUP_RESET_STATE);
1306
1307         if (ret == 0)
1308                 ret = num;
1309 out:
1310         pm_runtime_mark_last_busy(qup->dev);
1311         pm_runtime_put_autosuspend(qup->dev);
1312
1313         return ret;
1314 }
1315
1316 static u32 qup_i2c_func(struct i2c_adapter *adap)
1317 {
1318         return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
1319 }
1320
1321 static const struct i2c_algorithm qup_i2c_algo = {
1322         .master_xfer    = qup_i2c_xfer,
1323         .functionality  = qup_i2c_func,
1324 };
1325
1326 static const struct i2c_algorithm qup_i2c_algo_v2 = {
1327         .master_xfer    = qup_i2c_xfer_v2,
1328         .functionality  = qup_i2c_func,
1329 };
1330
1331 /*
1332  * The QUP block will issue a NACK and STOP on the bus when reaching
1333  * the end of the read, the length of the read is specified as one byte
1334  * which limits the possible read to 256 (QUP_READ_LIMIT) bytes.
1335  */
1336 static struct i2c_adapter_quirks qup_i2c_quirks = {
1337         .max_read_len = QUP_READ_LIMIT,
1338 };
1339
1340 static void qup_i2c_enable_clocks(struct qup_i2c_dev *qup)
1341 {
1342         clk_prepare_enable(qup->clk);
1343         clk_prepare_enable(qup->pclk);
1344 }
1345
1346 static void qup_i2c_disable_clocks(struct qup_i2c_dev *qup)
1347 {
1348         u32 config;
1349
1350         qup_i2c_change_state(qup, QUP_RESET_STATE);
1351         clk_disable_unprepare(qup->clk);
1352         config = readl(qup->base + QUP_CONFIG);
1353         config |= QUP_CLOCK_AUTO_GATE;
1354         writel(config, qup->base + QUP_CONFIG);
1355         clk_disable_unprepare(qup->pclk);
1356 }
1357
1358 static int qup_i2c_probe(struct platform_device *pdev)
1359 {
1360         static const int blk_sizes[] = {4, 16, 32};
1361         struct device_node *node = pdev->dev.of_node;
1362         struct qup_i2c_dev *qup;
1363         unsigned long one_bit_t;
1364         struct resource *res;
1365         u32 io_mode, hw_ver, size;
1366         int ret, fs_div, hs_div;
1367         int src_clk_freq;
1368         u32 clk_freq = 100000;
1369         int blocks;
1370
1371         qup = devm_kzalloc(&pdev->dev, sizeof(*qup), GFP_KERNEL);
1372         if (!qup)
1373                 return -ENOMEM;
1374
1375         qup->dev = &pdev->dev;
1376         init_completion(&qup->xfer);
1377         platform_set_drvdata(pdev, qup);
1378
1379         of_property_read_u32(node, "clock-frequency", &clk_freq);
1380
1381         if (of_device_is_compatible(pdev->dev.of_node, "qcom,i2c-qup-v1.1.1")) {
1382                 qup->adap.algo = &qup_i2c_algo;
1383                 qup->adap.quirks = &qup_i2c_quirks;
1384         } else {
1385                 qup->adap.algo = &qup_i2c_algo_v2;
1386                 ret = qup_i2c_req_dma(qup);
1387
1388                 if (ret == -EPROBE_DEFER)
1389                         goto fail_dma;
1390                 else if (ret != 0)
1391                         goto nodma;
1392
1393                 blocks = (MX_BLOCKS << 1) + 1;
1394                 qup->btx.sg = devm_kzalloc(&pdev->dev,
1395                                            sizeof(*qup->btx.sg) * blocks,
1396                                            GFP_KERNEL);
1397                 if (!qup->btx.sg) {
1398                         ret = -ENOMEM;
1399                         goto fail_dma;
1400                 }
1401                 sg_init_table(qup->btx.sg, blocks);
1402
1403                 qup->brx.sg = devm_kzalloc(&pdev->dev,
1404                                            sizeof(*qup->brx.sg) * blocks,
1405                                            GFP_KERNEL);
1406                 if (!qup->brx.sg) {
1407                         ret = -ENOMEM;
1408                         goto fail_dma;
1409                 }
1410                 sg_init_table(qup->brx.sg, blocks);
1411
1412                 /* 2 tag bytes for each block + 5 for start, stop tags */
1413                 size = blocks * 2 + 5;
1414
1415                 qup->start_tag.start = devm_kzalloc(&pdev->dev,
1416                                                     size, GFP_KERNEL);
1417                 if (!qup->start_tag.start) {
1418                         ret = -ENOMEM;
1419                         goto fail_dma;
1420                 }
1421
1422                 qup->brx.tag.start = devm_kzalloc(&pdev->dev, 2, GFP_KERNEL);
1423                 if (!qup->brx.tag.start) {
1424                         ret = -ENOMEM;
1425                         goto fail_dma;
1426                 }
1427
1428                 qup->btx.tag.start = devm_kzalloc(&pdev->dev, 2, GFP_KERNEL);
1429                 if (!qup->btx.tag.start) {
1430                         ret = -ENOMEM;
1431                         goto fail_dma;
1432                 }
1433                 qup->is_dma = true;
1434         }
1435
1436 nodma:
1437         /* We support frequencies up to FAST Mode (400KHz) */
1438         if (!clk_freq || clk_freq > 400000) {
1439                 dev_err(qup->dev, "clock frequency not supported %d\n",
1440                         clk_freq);
1441                 return -EINVAL;
1442         }
1443
1444         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1445         qup->base = devm_ioremap_resource(qup->dev, res);
1446         if (IS_ERR(qup->base))
1447                 return PTR_ERR(qup->base);
1448
1449         qup->irq = platform_get_irq(pdev, 0);
1450         if (qup->irq < 0) {
1451                 dev_err(qup->dev, "No IRQ defined\n");
1452                 return qup->irq;
1453         }
1454
1455         qup->clk = devm_clk_get(qup->dev, "core");
1456         if (IS_ERR(qup->clk)) {
1457                 dev_err(qup->dev, "Could not get core clock\n");
1458                 return PTR_ERR(qup->clk);
1459         }
1460
1461         qup->pclk = devm_clk_get(qup->dev, "iface");
1462         if (IS_ERR(qup->pclk)) {
1463                 dev_err(qup->dev, "Could not get iface clock\n");
1464                 return PTR_ERR(qup->pclk);
1465         }
1466
1467         qup_i2c_enable_clocks(qup);
1468
1469         /*
1470          * Bootloaders might leave a pending interrupt on certain QUP's,
1471          * so we reset the core before registering for interrupts.
1472          */
1473         writel(1, qup->base + QUP_SW_RESET);
1474         ret = qup_i2c_poll_state_valid(qup);
1475         if (ret)
1476                 goto fail;
1477
1478         ret = devm_request_irq(qup->dev, qup->irq, qup_i2c_interrupt,
1479                                IRQF_TRIGGER_HIGH, "i2c_qup", qup);
1480         if (ret) {
1481                 dev_err(qup->dev, "Request %d IRQ failed\n", qup->irq);
1482                 goto fail;
1483         }
1484         disable_irq(qup->irq);
1485
1486         hw_ver = readl(qup->base + QUP_HW_VERSION);
1487         dev_dbg(qup->dev, "Revision %x\n", hw_ver);
1488
1489         io_mode = readl(qup->base + QUP_IO_MODE);
1490
1491         /*
1492          * The block/fifo size w.r.t. 'actual data' is 1/2 due to 'tag'
1493          * associated with each byte written/received
1494          */
1495         size = QUP_OUTPUT_BLOCK_SIZE(io_mode);
1496         if (size >= ARRAY_SIZE(blk_sizes)) {
1497                 ret = -EIO;
1498                 goto fail;
1499         }
1500         qup->out_blk_sz = blk_sizes[size] / 2;
1501
1502         size = QUP_INPUT_BLOCK_SIZE(io_mode);
1503         if (size >= ARRAY_SIZE(blk_sizes)) {
1504                 ret = -EIO;
1505                 goto fail;
1506         }
1507         qup->in_blk_sz = blk_sizes[size] / 2;
1508
1509         size = QUP_OUTPUT_FIFO_SIZE(io_mode);
1510         qup->out_fifo_sz = qup->out_blk_sz * (2 << size);
1511
1512         size = QUP_INPUT_FIFO_SIZE(io_mode);
1513         qup->in_fifo_sz = qup->in_blk_sz * (2 << size);
1514
1515         src_clk_freq = clk_get_rate(qup->clk);
1516         fs_div = ((src_clk_freq / clk_freq) / 2) - 3;
1517         hs_div = 3;
1518         qup->clk_ctl = (hs_div << 8) | (fs_div & 0xff);
1519
1520         /*
1521          * Time it takes for a byte to be clocked out on the bus.
1522          * Each byte takes 9 clock cycles (8 bits + 1 ack).
1523          */
1524         one_bit_t = (USEC_PER_SEC / clk_freq) + 1;
1525         qup->one_byte_t = one_bit_t * 9;
1526
1527         dev_dbg(qup->dev, "IN:block:%d, fifo:%d, OUT:block:%d, fifo:%d\n",
1528                 qup->in_blk_sz, qup->in_fifo_sz,
1529                 qup->out_blk_sz, qup->out_fifo_sz);
1530
1531         i2c_set_adapdata(&qup->adap, qup);
1532         qup->adap.dev.parent = qup->dev;
1533         qup->adap.dev.of_node = pdev->dev.of_node;
1534         qup->is_last = true;
1535
1536         strlcpy(qup->adap.name, "QUP I2C adapter", sizeof(qup->adap.name));
1537
1538         pm_runtime_set_autosuspend_delay(qup->dev, MSEC_PER_SEC);
1539         pm_runtime_use_autosuspend(qup->dev);
1540         pm_runtime_set_active(qup->dev);
1541         pm_runtime_enable(qup->dev);
1542
1543         ret = i2c_add_adapter(&qup->adap);
1544         if (ret)
1545                 goto fail_runtime;
1546
1547         return 0;
1548
1549 fail_runtime:
1550         pm_runtime_disable(qup->dev);
1551         pm_runtime_set_suspended(qup->dev);
1552 fail:
1553         qup_i2c_disable_clocks(qup);
1554 fail_dma:
1555         if (qup->btx.dma)
1556                 dma_release_channel(qup->btx.dma);
1557         if (qup->brx.dma)
1558                 dma_release_channel(qup->brx.dma);
1559         return ret;
1560 }
1561
1562 static int qup_i2c_remove(struct platform_device *pdev)
1563 {
1564         struct qup_i2c_dev *qup = platform_get_drvdata(pdev);
1565
1566         if (qup->is_dma) {
1567                 dma_release_channel(qup->btx.dma);
1568                 dma_release_channel(qup->brx.dma);
1569         }
1570
1571         disable_irq(qup->irq);
1572         qup_i2c_disable_clocks(qup);
1573         i2c_del_adapter(&qup->adap);
1574         pm_runtime_disable(qup->dev);
1575         pm_runtime_set_suspended(qup->dev);
1576         return 0;
1577 }
1578
1579 #ifdef CONFIG_PM
1580 static int qup_i2c_pm_suspend_runtime(struct device *device)
1581 {
1582         struct qup_i2c_dev *qup = dev_get_drvdata(device);
1583
1584         dev_dbg(device, "pm_runtime: suspending...\n");
1585         qup_i2c_disable_clocks(qup);
1586         return 0;
1587 }
1588
1589 static int qup_i2c_pm_resume_runtime(struct device *device)
1590 {
1591         struct qup_i2c_dev *qup = dev_get_drvdata(device);
1592
1593         dev_dbg(device, "pm_runtime: resuming...\n");
1594         qup_i2c_enable_clocks(qup);
1595         return 0;
1596 }
1597 #endif
1598
1599 #ifdef CONFIG_PM_SLEEP
1600 static int qup_i2c_suspend(struct device *device)
1601 {
1602         if (!pm_runtime_suspended(device))
1603                 return qup_i2c_pm_suspend_runtime(device);
1604         return 0;
1605 }
1606
1607 static int qup_i2c_resume(struct device *device)
1608 {
1609         qup_i2c_pm_resume_runtime(device);
1610         pm_runtime_mark_last_busy(device);
1611         pm_request_autosuspend(device);
1612         return 0;
1613 }
1614 #endif
1615
1616 static const struct dev_pm_ops qup_i2c_qup_pm_ops = {
1617         SET_SYSTEM_SLEEP_PM_OPS(
1618                 qup_i2c_suspend,
1619                 qup_i2c_resume)
1620         SET_RUNTIME_PM_OPS(
1621                 qup_i2c_pm_suspend_runtime,
1622                 qup_i2c_pm_resume_runtime,
1623                 NULL)
1624 };
1625
1626 static const struct of_device_id qup_i2c_dt_match[] = {
1627         { .compatible = "qcom,i2c-qup-v1.1.1" },
1628         { .compatible = "qcom,i2c-qup-v2.1.1" },
1629         { .compatible = "qcom,i2c-qup-v2.2.1" },
1630         {}
1631 };
1632 MODULE_DEVICE_TABLE(of, qup_i2c_dt_match);
1633
1634 static struct platform_driver qup_i2c_driver = {
1635         .probe  = qup_i2c_probe,
1636         .remove = qup_i2c_remove,
1637         .driver = {
1638                 .name = "i2c_qup",
1639                 .pm = &qup_i2c_qup_pm_ops,
1640                 .of_match_table = qup_i2c_dt_match,
1641         },
1642 };
1643
1644 module_platform_driver(qup_i2c_driver);
1645
1646 MODULE_LICENSE("GPL v2");
1647 MODULE_ALIAS("platform:i2c_qup");