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/acpi.h>
  18 #include <linux/atomic.h>
  19 #include <linux/clk.h>
  20 #include <linux/delay.h>
  21 #include <linux/dmaengine.h>
  22 #include <linux/dmapool.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/err.h>
  25 #include <linux/i2c.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/io.h>
  28 #include <linux/module.h>
  29 #include <linux/of.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/pm_runtime.h>
  32 #include <linux/scatterlist.h>
  33
  34 /* QUP Registers */
  35 #define QUP_CONFIG              0x000
  36 #define QUP_STATE               0x004
  37 #define QUP_IO_MODE             0x008
  38 #define QUP_SW_RESET            0x00c
  39 #define QUP_OPERATIONAL         0x018
  40 #define QUP_ERROR_FLAGS         0x01c
  41 #define QUP_ERROR_FLAGS_EN      0x020
  42 #define QUP_OPERATIONAL_MASK    0x028
  43 #define QUP_HW_VERSION          0x030
  44 #define QUP_MX_OUTPUT_CNT       0x100
  45 #define QUP_OUT_FIFO_BASE       0x110
  46 #define QUP_MX_WRITE_CNT        0x150
  47 #define QUP_MX_INPUT_CNT        0x200
  48 #define QUP_MX_READ_CNT         0x208
  49 #define QUP_IN_FIFO_BASE        0x218
  50 #define QUP_I2C_CLK_CTL         0x400
  51 #define QUP_I2C_STATUS          0x404
  52 #define QUP_I2C_MASTER_GEN      0x408
  53
  54 /* QUP States and reset values */
  55 #define QUP_RESET_STATE         0
  56 #define QUP_RUN_STATE           1
  57 #define QUP_PAUSE_STATE         3
  58 #define QUP_STATE_MASK          3
  59
  60 #define QUP_STATE_VALID         BIT(2)
  61 #define QUP_I2C_MAST_GEN        BIT(4)
  62 #define QUP_I2C_FLUSH           BIT(6)
  63
  64 #define QUP_OPERATIONAL_RESET   0x000ff0
  65 #define QUP_I2C_STATUS_RESET    0xfffffc
  66
  67 /* QUP OPERATIONAL FLAGS */
  68 #define QUP_I2C_NACK_FLAG       BIT(3)
  69 #define QUP_OUT_NOT_EMPTY       BIT(4)
  70 #define QUP_IN_NOT_EMPTY        BIT(5)
  71 #define QUP_OUT_FULL            BIT(6)
  72 #define QUP_OUT_SVC_FLAG        BIT(8)
  73 #define QUP_IN_SVC_FLAG         BIT(9)
  74 #define QUP_MX_OUTPUT_DONE      BIT(10)
  75 #define QUP_MX_INPUT_DONE       BIT(11)
  76
  77 /* I2C mini core related values */
  78 #define QUP_CLOCK_AUTO_GATE     BIT(13)
  79 #define I2C_MINI_CORE           (2 << 8)
  80 #define I2C_N_VAL               15
  81 #define I2C_N_VAL_V2            7
  82
  83 /* Most significant word offset in FIFO port */
  84 #define QUP_MSW_SHIFT           (I2C_N_VAL + 1)
  85
  86 /* Packing/Unpacking words in FIFOs, and IO modes */
  87 #define QUP_OUTPUT_BLK_MODE     (1 << 10)
  88 #define QUP_OUTPUT_BAM_MODE     (3 << 10)
  89 #define QUP_INPUT_BLK_MODE      (1 << 12)
  90 #define QUP_INPUT_BAM_MODE      (3 << 12)
  91 #define QUP_BAM_MODE            (QUP_OUTPUT_BAM_MODE | QUP_INPUT_BAM_MODE)
  92 #define QUP_UNPACK_EN           BIT(14)
  93 #define QUP_PACK_EN             BIT(15)
  94
  95 #define QUP_REPACK_EN           (QUP_UNPACK_EN | QUP_PACK_EN)
  96 #define QUP_V2_TAGS_EN          1
  97
  98 #define QUP_OUTPUT_BLOCK_SIZE(x)(((x) >> 0) & 0x03)
  99 #define QUP_OUTPUT_FIFO_SIZE(x) (((x) >> 2) & 0x07)
 100 #define QUP_INPUT_BLOCK_SIZE(x) (((x) >> 5) & 0x03)
 101 #define QUP_INPUT_FIFO_SIZE(x)  (((x) >> 7) & 0x07)
 102
 103 /* QUP tags */
 104 #define QUP_TAG_START           (1 << 8)
 105 #define QUP_TAG_DATA            (2 << 8)
 106 #define QUP_TAG_STOP            (3 << 8)
 107 #define QUP_TAG_REC             (4 << 8)
 108 #define QUP_BAM_INPUT_EOT               0x93
 109 #define QUP_BAM_FLUSH_STOP              0x96
 110
 111 /* QUP v2 tags */
 112 #define QUP_TAG_V2_START               0x81
 113 #define QUP_TAG_V2_DATAWR              0x82
 114 #define QUP_TAG_V2_DATAWR_STOP         0x83
 115 #define QUP_TAG_V2_DATARD              0x85
 116 #define QUP_TAG_V2_DATARD_STOP         0x87
 117
 118 /* Status, Error flags */
 119 #define I2C_STATUS_WR_BUFFER_FULL       BIT(0)
 120 #define I2C_STATUS_BUS_ACTIVE           BIT(8)
 121 #define I2C_STATUS_ERROR_MASK           0x38000fc
 122 #define QUP_STATUS_ERROR_FLAGS          0x7c
 123
 124 #define QUP_READ_LIMIT                  256
 125 #define SET_BIT                         0x1
 126 #define RESET_BIT                       0x0
 127 #define ONE_BYTE                        0x1
 128 #define QUP_I2C_MX_CONFIG_DURING_RUN   BIT(31)
 129
 130 #define MX_TX_RX_LEN                    SZ_64K
 131 #define MX_BLOCKS                       (MX_TX_RX_LEN / QUP_READ_LIMIT)
 132
 133 /* Max timeout in ms for 32k bytes */
 134 #define TOUT_MAX                        300
 135
 136 /* Default values. Use these if FW query fails */
 137 #define DEFAULT_CLK_FREQ 100000
 138 #define DEFAULT_SRC_CLK 20000000
 139
 140 struct qup_i2c_block {
 141         int     count;
 142         int     pos;
 143         int     tx_tag_len;
 144         int     rx_tag_len;
 145         int     data_len;
 146         u8      tags[6];
 147 };
 148
 149 struct qup_i2c_tag {
 150         u8 *start;
 151         dma_addr_t addr;
 152 };
 153
 154 struct qup_i2c_bam {
 155         struct  qup_i2c_tag tag;
 156         struct  dma_chan *dma;
 157         struct  scatterlist *sg;
 158 };
 159
 160 struct qup_i2c_dev {
 161         struct device           *dev;
 162         void __iomem            *base;
 163         int                     irq;
 164         struct clk              *clk;
 165         struct clk              *pclk;
 166         struct i2c_adapter      adap;
 167
 168         int                     clk_ctl;
 169         int                     out_fifo_sz;
 170         int                     in_fifo_sz;
 171         int                     out_blk_sz;
 172         int                     in_blk_sz;
 173
 174         unsigned long           one_byte_t;
 175         struct qup_i2c_block    blk;
 176
 177         struct i2c_msg          *msg;
 178         /* Current posion in user message buffer */
 179         int                     pos;
 180         /* I2C protocol errors */
 181         u32                     bus_err;
 182         /* QUP core errors */
 183         u32                     qup_err;
 184
 185         /* To check if this is the last msg */
 186         bool                    is_last;
 187
 188         /* To configure when bus is in run state */
 189         int                     config_run;
 190
 191         /* dma parameters */
 192         bool                    is_dma;
 193         struct                  dma_pool *dpool;
 194         struct                  qup_i2c_tag start_tag;
 195         struct                  qup_i2c_bam brx;
 196         struct                  qup_i2c_bam btx;
 197
 198         struct completion       xfer;
 199 };
 200
 201 static irqreturn_t qup_i2c_interrupt(int irq, void *dev)
 202 {
 203         struct qup_i2c_dev *qup = dev;
 204         u32 bus_err;
 205         u32 qup_err;
 206         u32 opflags;
 207
 208         bus_err = readl(qup->base + QUP_I2C_STATUS);
 209         qup_err = readl(qup->base + QUP_ERROR_FLAGS);
 210         opflags = readl(qup->base + QUP_OPERATIONAL);
 211
 212         if (!qup->msg) {
 213                 /* Clear Error interrupt */
 214                 writel(QUP_RESET_STATE, qup->base + QUP_STATE);
 215                 return IRQ_HANDLED;
 216         }
 217
 218         bus_err &= I2C_STATUS_ERROR_MASK;
 219         qup_err &= QUP_STATUS_ERROR_FLAGS;
 220
 221         /* Clear the error bits in QUP_ERROR_FLAGS */
 222         if (qup_err)
 223                 writel(qup_err, qup->base + QUP_ERROR_FLAGS);
 224
 225         /* Clear the error bits in QUP_I2C_STATUS */
 226         if (bus_err)
 227                 writel(bus_err, qup->base + QUP_I2C_STATUS);
 228
 229         /* Reset the QUP State in case of error */
 230         if (qup_err || bus_err) {
 231                 writel(QUP_RESET_STATE, qup->base + QUP_STATE);
 232                 goto done;
 233         }
 234
 235         if (opflags & QUP_IN_SVC_FLAG)
 236                 writel(QUP_IN_SVC_FLAG, qup->base + QUP_OPERATIONAL);
 237
 238         if (opflags & QUP_OUT_SVC_FLAG)
 239                 writel(QUP_OUT_SVC_FLAG, qup->base + QUP_OPERATIONAL);
 240
 241 done:
 242         qup->qup_err = qup_err;
 243         qup->bus_err = bus_err;
 244         complete(&qup->xfer);
 245         return IRQ_HANDLED;
 246 }
 247
 248 static int qup_i2c_poll_state_mask(struct qup_i2c_dev *qup,
 249                                    u32 req_state, u32 req_mask)
 250 {
 251         int retries = 1;
 252         u32 state;
 253
 254         /*
 255          * State transition takes 3 AHB clocks cycles + 3 I2C master clock
 256          * cycles. So retry once after a 1uS delay.
 257          */
 258         do {
 259                 state = readl(qup->base + QUP_STATE);
 260
 261                 if (state & QUP_STATE_VALID &&
 262                     (state & req_mask) == req_state)
 263                         return 0;
 264
 265                 udelay(1);
 266         } while (retries--);
 267
 268         return -ETIMEDOUT;
 269 }
 270
 271 static int qup_i2c_poll_state(struct qup_i2c_dev *qup, u32 req_state)
 272 {
 273         return qup_i2c_poll_state_mask(qup, req_state, QUP_STATE_MASK);
 274 }
 275
 276 static void qup_i2c_flush(struct qup_i2c_dev *qup)
 277 {
 278         u32 val = readl(qup->base + QUP_STATE);
 279
 280         val |= QUP_I2C_FLUSH;
 281         writel(val, qup->base + QUP_STATE);
 282 }
 283
 284 static int qup_i2c_poll_state_valid(struct qup_i2c_dev *qup)
 285 {
 286         return qup_i2c_poll_state_mask(qup, 0, 0);
 287 }
 288
 289 static int qup_i2c_poll_state_i2c_master(struct qup_i2c_dev *qup)
 290 {
 291         return qup_i2c_poll_state_mask(qup, QUP_I2C_MAST_GEN, QUP_I2C_MAST_GEN);
 292 }
 293
 294 static int qup_i2c_change_state(struct qup_i2c_dev *qup, u32 state)
 295 {
 296         if (qup_i2c_poll_state_valid(qup) != 0)
 297                 return -EIO;
 298
 299         writel(state, qup->base + QUP_STATE);
 300
 301         if (qup_i2c_poll_state(qup, state) != 0)
 302                 return -EIO;
 303         return 0;
 304 }
 305
 306 /**
 307  * qup_i2c_wait_ready - wait for a give number of bytes in tx/rx path
 308  * @qup: The qup_i2c_dev device
 309  * @op: The bit/event to wait on
 310  * @val: value of the bit to wait on, 0 or 1
 311  * @len: The length the bytes to be transferred
 312  */
 313 static int qup_i2c_wait_ready(struct qup_i2c_dev *qup, int op, bool val,
 314                               int len)
 315 {
 316         unsigned long timeout;
 317         u32 opflags;
 318         u32 status;
 319         u32 shift = __ffs(op);
 320         int ret = 0;
 321
 322         len *= qup->one_byte_t;
 323         /* timeout after a wait of twice the max time */
 324         timeout = jiffies + len * 4;
 325
 326         for (;;) {
 327                 opflags = readl(qup->base + QUP_OPERATIONAL);
 328                 status = readl(qup->base + QUP_I2C_STATUS);
 329
 330                 if (((opflags & op) >> shift) == val) {
 331                         if ((op == QUP_OUT_NOT_EMPTY) && qup->is_last) {
 332                                 if (!(status & I2C_STATUS_BUS_ACTIVE)) {
 333                                         ret = 0;
 334                                         goto done;
 335                                 }
 336                         } else {
 337                                 ret = 0;
 338                                 goto done;
 339                         }
 340                 }
 341
 342                 if (time_after(jiffies, timeout)) {
 343                         ret = -ETIMEDOUT;
 344                         goto done;
 345                 }
 346                 usleep_range(len, len * 2);
 347         }
 348
 349 done:
 350         if (qup->bus_err || qup->qup_err)
 351                 ret =  (qup->bus_err & QUP_I2C_NACK_FLAG) ? -ENXIO : -EIO;
 352
 353         return ret;
 354 }
 355
 356 static void qup_i2c_set_write_mode_v2(struct qup_i2c_dev *qup,
 357                                       struct i2c_msg *msg)
 358 {
 359         /* Number of entries to shift out, including the tags */
 360         int total = msg->len + qup->blk.tx_tag_len;
 361
 362         total |= qup->config_run;
 363
 364         if (total < qup->out_fifo_sz) {
 365                 /* FIFO mode */
 366                 writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE);
 367                 writel(total, qup->base + QUP_MX_WRITE_CNT);
 368         } else {
 369                 /* BLOCK mode (transfer data on chunks) */
 370                 writel(QUP_OUTPUT_BLK_MODE | QUP_REPACK_EN,
 371                        qup->base + QUP_IO_MODE);
 372                 writel(total, qup->base + QUP_MX_OUTPUT_CNT);
 373         }
 374 }
 375
 376 static void qup_i2c_set_write_mode(struct qup_i2c_dev *qup, struct i2c_msg *msg)
 377 {
 378         /* Number of entries to shift out, including the start */
 379         int total = msg->len + 1;
 380
 381         if (total < qup->out_fifo_sz) {
 382                 /* FIFO mode */
 383                 writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE);
 384                 writel(total, qup->base + QUP_MX_WRITE_CNT);
 385         } else {
 386                 /* BLOCK mode (transfer data on chunks) */
 387                 writel(QUP_OUTPUT_BLK_MODE | QUP_REPACK_EN,
 388                        qup->base + QUP_IO_MODE);
 389                 writel(total, qup->base + QUP_MX_OUTPUT_CNT);
 390         }
 391 }
 392
 393 static int check_for_fifo_space(struct qup_i2c_dev *qup)
 394 {
 395         int ret;
 396
 397         ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
 398         if (ret)
 399                 goto out;
 400
 401         ret = qup_i2c_wait_ready(qup, QUP_OUT_FULL,
 402                                  RESET_BIT, 4 * ONE_BYTE);
 403         if (ret) {
 404                 /* Fifo is full. Drain out the fifo */
 405                 ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 406                 if (ret)
 407                         goto out;
 408
 409                 ret = qup_i2c_wait_ready(qup, QUP_OUT_NOT_EMPTY,
 410                                          RESET_BIT, 256 * ONE_BYTE);
 411                 if (ret) {
 412                         dev_err(qup->dev, "timeout for fifo out full");
 413                         goto out;
 414                 }
 415
 416                 ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
 417                 if (ret)
 418                         goto out;
 419         }
 420
 421 out:
 422         return ret;
 423 }
 424
 425 static int qup_i2c_issue_write(struct qup_i2c_dev *qup, struct i2c_msg *msg)
 426 {
 427         u32 addr = msg->addr << 1;
 428         u32 qup_tag;
 429         int idx;
 430         u32 val;
 431         int ret = 0;
 432
 433         if (qup->pos == 0) {
 434                 val = QUP_TAG_START | addr;
 435                 idx = 1;
 436         } else {
 437                 val = 0;
 438                 idx = 0;
 439         }
 440
 441         while (qup->pos < msg->len) {
 442                 /* Check that there's space in the FIFO for our pair */
 443                 ret = check_for_fifo_space(qup);
 444                 if (ret)
 445                         return ret;
 446
 447                 if (qup->pos == msg->len - 1)
 448                         qup_tag = QUP_TAG_STOP;
 449                 else
 450                         qup_tag = QUP_TAG_DATA;
 451
 452                 if (idx & 1)
 453                         val |= (qup_tag | msg->buf[qup->pos]) << QUP_MSW_SHIFT;
 454                 else
 455                         val = qup_tag | msg->buf[qup->pos];
 456
 457                 /* Write out the pair and the last odd value */
 458                 if (idx & 1 || qup->pos == msg->len - 1)
 459                         writel(val, qup->base + QUP_OUT_FIFO_BASE);
 460
 461                 qup->pos++;
 462                 idx++;
 463         }
 464
 465         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 466
 467         return ret;
 468 }
 469
 470 static void qup_i2c_set_blk_data(struct qup_i2c_dev *qup,
 471                                  struct i2c_msg *msg)
 472 {
 473         memset(&qup->blk, 0, sizeof(qup->blk));
 474
 475         qup->blk.data_len = msg->len;
 476         qup->blk.count = (msg->len + QUP_READ_LIMIT - 1) / QUP_READ_LIMIT;
 477
 478         /* 4 bytes for first block and 2 writes for rest */
 479         qup->blk.tx_tag_len = 4 + (qup->blk.count - 1) * 2;
 480
 481         /* There are 2 tag bytes that are read in to fifo for every block */
 482         if (msg->flags & I2C_M_RD)
 483                 qup->blk.rx_tag_len = qup->blk.count * 2;
 484 }
 485
 486 static int qup_i2c_send_data(struct qup_i2c_dev *qup, int tlen, u8 *tbuf,
 487                              int dlen, u8 *dbuf)
 488 {
 489         u32 val = 0, idx = 0, pos = 0, i = 0, t;
 490         int  len = tlen + dlen;
 491         u8 *buf = tbuf;
 492         int ret = 0;
 493
 494         while (len > 0) {
 495                 ret = check_for_fifo_space(qup);
 496                 if (ret)
 497                         return ret;
 498
 499                 t = (len >= 4) ? 4 : len;
 500
 501                 while (idx < t) {
 502                         if (!i && (pos >= tlen)) {
 503                                 buf = dbuf;
 504                                 pos = 0;
 505                                 i = 1;
 506                         }
 507                         val |= buf[pos++] << (idx++ * 8);
 508                 }
 509
 510                 writel(val, qup->base + QUP_OUT_FIFO_BASE);
 511                 idx  = 0;
 512                 val = 0;
 513                 len -= 4;
 514         }
 515
 516         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 517
 518         return ret;
 519 }
 520
 521 static int qup_i2c_get_data_len(struct qup_i2c_dev *qup)
 522 {
 523         int data_len;
 524
 525         if (qup->blk.data_len > QUP_READ_LIMIT)
 526                 data_len = QUP_READ_LIMIT;
 527         else
 528                 data_len = qup->blk.data_len;
 529
 530         return data_len;
 531 }
 532
 533 static bool qup_i2c_check_msg_len(struct i2c_msg *msg)
 534 {
 535         return ((msg->flags & I2C_M_RD) && (msg->flags & I2C_M_RECV_LEN));
 536 }
 537
 538 static int qup_i2c_set_tags_smb(u16 addr, u8 *tags, struct qup_i2c_dev *qup,
 539                         struct i2c_msg *msg)
 540 {
 541         int len = 0;
 542
 543         if (msg->len > 1) {
 544                 tags[len++] = QUP_TAG_V2_DATARD_STOP;
 545                 tags[len++] = qup_i2c_get_data_len(qup) - 1;
 546         } else {
 547                 tags[len++] = QUP_TAG_V2_START;
 548                 tags[len++] = addr & 0xff;
 549
 550                 if (msg->flags & I2C_M_TEN)
 551                         tags[len++] = addr >> 8;
 552
 553                 tags[len++] = QUP_TAG_V2_DATARD;
 554                 /* Read 1 byte indicating the length of the SMBus message */
 555                 tags[len++] = 1;
 556         }
 557         return len;
 558 }
 559
 560 static int qup_i2c_set_tags(u8 *tags, struct qup_i2c_dev *qup,
 561                             struct i2c_msg *msg,  int is_dma)
 562 {
 563         u16 addr = i2c_8bit_addr_from_msg(msg);
 564         int len = 0;
 565         int data_len;
 566
 567         int last = (qup->blk.pos == (qup->blk.count - 1)) && (qup->is_last);
 568
 569         /* Handle tags for SMBus block read */
 570         if (qup_i2c_check_msg_len(msg))
 571                 return qup_i2c_set_tags_smb(addr, tags, qup, msg);
 572
 573         if (qup->blk.pos == 0) {
 574                 tags[len++] = QUP_TAG_V2_START;
 575                 tags[len++] = addr & 0xff;
 576
 577                 if (msg->flags & I2C_M_TEN)
 578                         tags[len++] = addr >> 8;
 579         }
 580
 581         /* Send _STOP commands for the last block */
 582         if (last) {
 583                 if (msg->flags & I2C_M_RD)
 584                         tags[len++] = QUP_TAG_V2_DATARD_STOP;
 585                 else
 586                         tags[len++] = QUP_TAG_V2_DATAWR_STOP;
 587         } else {
 588                 if (msg->flags & I2C_M_RD)
 589                         tags[len++] = QUP_TAG_V2_DATARD;
 590                 else
 591                         tags[len++] = QUP_TAG_V2_DATAWR;
 592         }
 593
 594         data_len = qup_i2c_get_data_len(qup);
 595
 596         /* 0 implies 256 bytes */
 597         if (data_len == QUP_READ_LIMIT)
 598                 tags[len++] = 0;
 599         else
 600                 tags[len++] = data_len;
 601
 602         if ((msg->flags & I2C_M_RD) && last && is_dma) {
 603                 tags[len++] = QUP_BAM_INPUT_EOT;
 604                 tags[len++] = QUP_BAM_FLUSH_STOP;
 605         }
 606
 607         return len;
 608 }
 609
 610 static int qup_i2c_issue_xfer_v2(struct qup_i2c_dev *qup, struct i2c_msg *msg)
 611 {
 612         int data_len = 0, tag_len, index;
 613         int ret;
 614
 615         tag_len = qup_i2c_set_tags(qup->blk.tags, qup, msg, 0);
 616         index = msg->len - qup->blk.data_len;
 617
 618         /* only tags are written for read */
 619         if (!(msg->flags & I2C_M_RD))
 620                 data_len = qup_i2c_get_data_len(qup);
 621
 622         ret = qup_i2c_send_data(qup, tag_len, qup->blk.tags,
 623                                 data_len, &msg->buf[index]);
 624         qup->blk.data_len -= data_len;
 625
 626         return ret;
 627 }
 628
 629 static void qup_i2c_bam_cb(void *data)
 630 {
 631         struct qup_i2c_dev *qup = data;
 632
 633         complete(&qup->xfer);
 634 }
 635
 636 static int qup_sg_set_buf(struct scatterlist *sg, void *buf,
 637                           unsigned int buflen, struct qup_i2c_dev *qup,
 638                           int dir)
 639 {
 640         int ret;
 641
 642         sg_set_buf(sg, buf, buflen);
 643         ret = dma_map_sg(qup->dev, sg, 1, dir);
 644         if (!ret)
 645                 return -EINVAL;
 646
 647         return 0;
 648 }
 649
 650 static void qup_i2c_rel_dma(struct qup_i2c_dev *qup)
 651 {
 652         if (qup->btx.dma)
 653                 dma_release_channel(qup->btx.dma);
 654         if (qup->brx.dma)
 655                 dma_release_channel(qup->brx.dma);
 656         qup->btx.dma = NULL;
 657         qup->brx.dma = NULL;
 658 }
 659
 660 static int qup_i2c_req_dma(struct qup_i2c_dev *qup)
 661 {
 662         int err;
 663
 664         if (!qup->btx.dma) {
 665                 qup->btx.dma = dma_request_slave_channel_reason(qup->dev, "tx");
 666                 if (IS_ERR(qup->btx.dma)) {
 667                         err = PTR_ERR(qup->btx.dma);
 668                         qup->btx.dma = NULL;
 669                         dev_err(qup->dev, "\n tx channel not available");
 670                         return err;
 671                 }
 672         }
 673
 674         if (!qup->brx.dma) {
 675                 qup->brx.dma = dma_request_slave_channel_reason(qup->dev, "rx");
 676                 if (IS_ERR(qup->brx.dma)) {
 677                         dev_err(qup->dev, "\n rx channel not available");
 678                         err = PTR_ERR(qup->brx.dma);
 679                         qup->brx.dma = NULL;
 680                         qup_i2c_rel_dma(qup);
 681                         return err;
 682                 }
 683         }
 684         return 0;
 685 }
 686
 687 static int qup_i2c_bam_do_xfer(struct qup_i2c_dev *qup, struct i2c_msg *msg,
 688                                int num)
 689 {
 690         struct dma_async_tx_descriptor *txd, *rxd = NULL;
 691         int ret = 0, idx = 0, limit = QUP_READ_LIMIT;
 692         dma_cookie_t cookie_rx, cookie_tx;
 693         u32 rx_nents = 0, tx_nents = 0, len, blocks, rem;
 694         u32 i, tlen, tx_len, tx_buf = 0, rx_buf = 0, off = 0;
 695         u8 *tags;
 696
 697         while (idx < num) {
 698                 tx_len = 0, len = 0, i = 0;
 699
 700                 qup->is_last = (idx == (num - 1));
 701
 702                 qup_i2c_set_blk_data(qup, msg);
 703
 704                 blocks = qup->blk.count;
 705                 rem = msg->len - (blocks - 1) * limit;
 706
 707                 if (msg->flags & I2C_M_RD) {
 708                         rx_nents += (blocks * 2) + 1;
 709                         tx_nents += 1;
 710
 711                         while (qup->blk.pos < blocks) {
 712                                 tlen = (i == (blocks - 1)) ? rem : limit;
 713                                 tags = &qup->start_tag.start[off + len];
 714                                 len += qup_i2c_set_tags(tags, qup, msg, 1);
 715                                 qup->blk.data_len -= tlen;
 716
 717                                 /* scratch buf to read the start and len tags */
 718                                 ret = qup_sg_set_buf(&qup->brx.sg[rx_buf++],
 719                                                      &qup->brx.tag.start[0],
 720                                                      2, qup, DMA_FROM_DEVICE);
 721
 722                                 if (ret)
 723                                         return ret;
 724
 725                                 ret = qup_sg_set_buf(&qup->brx.sg[rx_buf++],
 726                                                      &msg->buf[limit * i],
 727                                                      tlen, qup,
 728                                                      DMA_FROM_DEVICE);
 729                                 if (ret)
 730                                         return ret;
 731
 732                                 i++;
 733                                 qup->blk.pos = i;
 734                         }
 735                         ret = qup_sg_set_buf(&qup->btx.sg[tx_buf++],
 736                                              &qup->start_tag.start[off],
 737                                              len, qup, DMA_TO_DEVICE);
 738                         if (ret)
 739                                 return ret;
 740
 741                         off += len;
 742                         /* scratch buf to read the BAM EOT and FLUSH tags */
 743                         ret = qup_sg_set_buf(&qup->brx.sg[rx_buf++],
 744                                              &qup->brx.tag.start[0],
 745                                              2, qup, DMA_FROM_DEVICE);
 746                         if (ret)
 747                                 return ret;
 748                 } else {
 749                         tx_nents += (blocks * 2);
 750
 751                         while (qup->blk.pos < blocks) {
 752                                 tlen = (i == (blocks - 1)) ? rem : limit;
 753                                 tags = &qup->start_tag.start[off + tx_len];
 754                                 len = qup_i2c_set_tags(tags, qup, msg, 1);
 755                                 qup->blk.data_len -= tlen;
 756
 757                                 ret = qup_sg_set_buf(&qup->btx.sg[tx_buf++],
 758                                                      tags, len,
 759                                                      qup, DMA_TO_DEVICE);
 760                                 if (ret)
 761                                         return ret;
 762
 763                                 tx_len += len;
 764                                 ret = qup_sg_set_buf(&qup->btx.sg[tx_buf++],
 765                                                      &msg->buf[limit * i],
 766                                                      tlen, qup, DMA_TO_DEVICE);
 767                                 if (ret)
 768                                         return ret;
 769                                 i++;
 770                                 qup->blk.pos = i;
 771                         }
 772                         off += tx_len;
 773
 774                         if (idx == (num - 1)) {
 775                                 len = 1;
 776                                 if (rx_nents) {
 777                                         qup->btx.tag.start[0] =
 778                                                         QUP_BAM_INPUT_EOT;
 779                                         len++;
 780                                 }
 781                                 qup->btx.tag.start[len - 1] =
 782                                                         QUP_BAM_FLUSH_STOP;
 783                                 ret = qup_sg_set_buf(&qup->btx.sg[tx_buf++],
 784                                                      &qup->btx.tag.start[0],
 785                                                      len, qup, DMA_TO_DEVICE);
 786                                 if (ret)
 787                                         return ret;
 788                                 tx_nents += 1;
 789                         }
 790                 }
 791                 idx++;
 792                 msg++;
 793         }
 794
 795         txd = dmaengine_prep_slave_sg(qup->btx.dma, qup->btx.sg, tx_nents,
 796                                       DMA_MEM_TO_DEV,
 797                                       DMA_PREP_INTERRUPT | DMA_PREP_FENCE);
 798         if (!txd) {
 799                 dev_err(qup->dev, "failed to get tx desc\n");
 800                 ret = -EINVAL;
 801                 goto desc_err;
 802         }
 803
 804         if (!rx_nents) {
 805                 txd->callback = qup_i2c_bam_cb;
 806                 txd->callback_param = qup;
 807         }
 808
 809         cookie_tx = dmaengine_submit(txd);
 810         if (dma_submit_error(cookie_tx)) {
 811                 ret = -EINVAL;
 812                 goto desc_err;
 813         }
 814
 815         dma_async_issue_pending(qup->btx.dma);
 816
 817         if (rx_nents) {
 818                 rxd = dmaengine_prep_slave_sg(qup->brx.dma, qup->brx.sg,
 819                                               rx_nents, DMA_DEV_TO_MEM,
 820                                               DMA_PREP_INTERRUPT);
 821                 if (!rxd) {
 822                         dev_err(qup->dev, "failed to get rx desc\n");
 823                         ret = -EINVAL;
 824
 825                         /* abort TX descriptors */
 826                         dmaengine_terminate_all(qup->btx.dma);
 827                         goto desc_err;
 828                 }
 829
 830                 rxd->callback = qup_i2c_bam_cb;
 831                 rxd->callback_param = qup;
 832                 cookie_rx = dmaengine_submit(rxd);
 833                 if (dma_submit_error(cookie_rx)) {
 834                         ret = -EINVAL;
 835                         goto desc_err;
 836                 }
 837
 838                 dma_async_issue_pending(qup->brx.dma);
 839         }
 840
 841         if (!wait_for_completion_timeout(&qup->xfer, TOUT_MAX * HZ)) {
 842                 dev_err(qup->dev, "normal trans timed out\n");
 843                 ret = -ETIMEDOUT;
 844         }
 845
 846         if (ret || qup->bus_err || qup->qup_err) {
 847                 if (qup_i2c_change_state(qup, QUP_RUN_STATE)) {
 848                         dev_err(qup->dev, "change to run state timed out");
 849                         goto desc_err;
 850                 }
 851
 852                 if (rx_nents)
 853                         writel(QUP_BAM_INPUT_EOT,
 854                                qup->base + QUP_OUT_FIFO_BASE);
 855
 856                 writel(QUP_BAM_FLUSH_STOP, qup->base + QUP_OUT_FIFO_BASE);
 857
 858                 qup_i2c_flush(qup);
 859
 860                 /* wait for remaining interrupts to occur */
 861                 if (!wait_for_completion_timeout(&qup->xfer, HZ))
 862                         dev_err(qup->dev, "flush timed out\n");
 863
 864                 qup_i2c_rel_dma(qup);
 865
 866                 ret =  (qup->bus_err & QUP_I2C_NACK_FLAG) ? -ENXIO : -EIO;
 867         }
 868
 869 desc_err:
 870         dma_unmap_sg(qup->dev, qup->btx.sg, tx_nents, DMA_TO_DEVICE);
 871
 872         if (rx_nents)
 873                 dma_unmap_sg(qup->dev, qup->brx.sg, rx_nents,
 874                              DMA_FROM_DEVICE);
 875
 876         return ret;
 877 }
 878
 879 static int qup_i2c_bam_xfer(struct i2c_adapter *adap, struct i2c_msg *msg,
 880                             int num)
 881 {
 882         struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
 883         int ret = 0;
 884
 885         enable_irq(qup->irq);
 886         ret = qup_i2c_req_dma(qup);
 887
 888         if (ret)
 889                 goto out;
 890
 891         writel(0, qup->base + QUP_MX_INPUT_CNT);
 892         writel(0, qup->base + QUP_MX_OUTPUT_CNT);
 893
 894         /* set BAM mode */
 895         writel(QUP_REPACK_EN | QUP_BAM_MODE, qup->base + QUP_IO_MODE);
 896
 897         /* mask fifo irqs */
 898         writel((0x3 << 8), qup->base + QUP_OPERATIONAL_MASK);
 899
 900         /* set RUN STATE */
 901         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 902         if (ret)
 903                 goto out;
 904
 905         writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);
 906
 907         qup->msg = msg;
 908         ret = qup_i2c_bam_do_xfer(qup, qup->msg, num);
 909 out:
 910         disable_irq(qup->irq);
 911
 912         qup->msg = NULL;
 913         return ret;
 914 }
 915
 916 static int qup_i2c_wait_for_complete(struct qup_i2c_dev *qup,
 917                                      struct i2c_msg *msg)
 918 {
 919         unsigned long left;
 920         int ret = 0;
 921
 922         left = wait_for_completion_timeout(&qup->xfer, HZ);
 923         if (!left) {
 924                 writel(1, qup->base + QUP_SW_RESET);
 925                 ret = -ETIMEDOUT;
 926         }
 927
 928         if (qup->bus_err || qup->qup_err)
 929                 ret =  (qup->bus_err & QUP_I2C_NACK_FLAG) ? -ENXIO : -EIO;
 930
 931         return ret;
 932 }
 933
 934 static int qup_i2c_write_one_v2(struct qup_i2c_dev *qup, struct i2c_msg *msg)
 935 {
 936         int ret = 0;
 937
 938         qup->msg = msg;
 939         qup->pos = 0;
 940         enable_irq(qup->irq);
 941         qup_i2c_set_blk_data(qup, msg);
 942         qup_i2c_set_write_mode_v2(qup, msg);
 943
 944         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 945         if (ret)
 946                 goto err;
 947
 948         writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);
 949
 950         do {
 951                 ret = qup_i2c_issue_xfer_v2(qup, msg);
 952                 if (ret)
 953                         goto err;
 954
 955                 ret = qup_i2c_wait_for_complete(qup, msg);
 956                 if (ret)
 957                         goto err;
 958
 959                 qup->blk.pos++;
 960         } while (qup->blk.pos < qup->blk.count);
 961
 962         ret = qup_i2c_wait_ready(qup, QUP_OUT_NOT_EMPTY, RESET_BIT, ONE_BYTE);
 963
 964 err:
 965         disable_irq(qup->irq);
 966         qup->msg = NULL;
 967
 968         return ret;
 969 }
 970
 971 static int qup_i2c_write_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
 972 {
 973         int ret;
 974
 975         qup->msg = msg;
 976         qup->pos = 0;
 977
 978         enable_irq(qup->irq);
 979
 980         qup_i2c_set_write_mode(qup, msg);
 981
 982         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 983         if (ret)
 984                 goto err;
 985
 986         writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);
 987
 988         do {
 989                 ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
 990                 if (ret)
 991                         goto err;
 992
 993                 ret = qup_i2c_issue_write(qup, msg);
 994                 if (ret)
 995                         goto err;
 996
 997                 ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
 998                 if (ret)
 999                         goto err;
1000
1001                 ret = qup_i2c_wait_for_complete(qup, msg);
1002                 if (ret)
1003                         goto err;
1004         } while (qup->pos < msg->len);
1005
1006         /* Wait for the outstanding data in the fifo to drain */
1007         ret = qup_i2c_wait_ready(qup, QUP_OUT_NOT_EMPTY, RESET_BIT, ONE_BYTE);
1008 err:
1009         disable_irq(qup->irq);
1010         qup->msg = NULL;
1011
1012         return ret;
1013 }
1014
1015 static void qup_i2c_set_read_mode(struct qup_i2c_dev *qup, int len)
1016 {
1017         if (len < qup->in_fifo_sz) {
1018                 /* FIFO mode */
1019                 writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE);
1020                 writel(len, qup->base + QUP_MX_READ_CNT);
1021         } else {
1022                 /* BLOCK mode (transfer data on chunks) */
1023                 writel(QUP_INPUT_BLK_MODE | QUP_REPACK_EN,
1024                        qup->base + QUP_IO_MODE);
1025                 writel(len, qup->base + QUP_MX_INPUT_CNT);
1026         }
1027 }
1028
1029 static void qup_i2c_set_read_mode_v2(struct qup_i2c_dev *qup, int len)
1030 {
1031         int tx_len = qup->blk.tx_tag_len;
1032
1033         len += qup->blk.rx_tag_len;
1034         len |= qup->config_run;
1035         tx_len |= qup->config_run;
1036
1037         if (len < qup->in_fifo_sz) {
1038                 /* FIFO mode */
1039                 writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE);
1040                 writel(tx_len, qup->base + QUP_MX_WRITE_CNT);
1041                 writel(len, qup->base + QUP_MX_READ_CNT);
1042         } else {
1043                 /* BLOCK mode (transfer data on chunks) */
1044                 writel(QUP_INPUT_BLK_MODE | QUP_REPACK_EN,
1045                        qup->base + QUP_IO_MODE);
1046                 writel(tx_len, qup->base + QUP_MX_OUTPUT_CNT);
1047                 writel(len, qup->base + QUP_MX_INPUT_CNT);
1048         }
1049 }
1050
1051 static void qup_i2c_issue_read(struct qup_i2c_dev *qup, struct i2c_msg *msg)
1052 {
1053         u32 addr, len, val;
1054
1055         addr = i2c_8bit_addr_from_msg(msg);
1056
1057         /* 0 is used to specify a length 256 (QUP_READ_LIMIT) */
1058         len = (msg->len == QUP_READ_LIMIT) ? 0 : msg->len;
1059
1060         val = ((QUP_TAG_REC | len) << QUP_MSW_SHIFT) | QUP_TAG_START | addr;
1061         writel(val, qup->base + QUP_OUT_FIFO_BASE);
1062 }
1063
1064
1065 static int qup_i2c_read_fifo(struct qup_i2c_dev *qup, struct i2c_msg *msg)
1066 {
1067         u32 val = 0;
1068         int idx;
1069         int ret = 0;
1070
1071         for (idx = 0; qup->pos < msg->len; idx++) {
1072                 if ((idx & 1) == 0) {
1073                         /* Check that FIFO have data */
1074                         ret = qup_i2c_wait_ready(qup, QUP_IN_NOT_EMPTY,
1075                                                  SET_BIT, 4 * ONE_BYTE);
1076                         if (ret)
1077                                 return ret;
1078
1079                         /* Reading 2 words at time */
1080                         val = readl(qup->base + QUP_IN_FIFO_BASE);
1081
1082                         msg->buf[qup->pos++] = val & 0xFF;
1083                 } else {
1084                         msg->buf[qup->pos++] = val >> QUP_MSW_SHIFT;
1085                 }
1086         }
1087
1088         return ret;
1089 }
1090
1091 static int qup_i2c_read_fifo_v2(struct qup_i2c_dev *qup,
1092                                 struct i2c_msg *msg)
1093 {
1094         u32 val;
1095         int idx, pos = 0, ret = 0, total, msg_offset = 0;
1096
1097         /*
1098          * If the message length is already read in
1099          * the first byte of the buffer, account for
1100          * that by setting the offset
1101          */
1102         if (qup_i2c_check_msg_len(msg) && (msg->len > 1))
1103                 msg_offset = 1;
1104         total = qup_i2c_get_data_len(qup);
1105         total -= msg_offset;
1106
1107         /* 2 extra bytes for read tags */
1108         while (pos < (total + 2)) {
1109                 /* Check that FIFO have data */
1110                 ret = qup_i2c_wait_ready(qup, QUP_IN_NOT_EMPTY,
1111                                          SET_BIT, 4 * ONE_BYTE);
1112                 if (ret) {
1113                         dev_err(qup->dev, "timeout for fifo not empty");
1114                         return ret;
1115                 }
1116                 val = readl(qup->base + QUP_IN_FIFO_BASE);
1117
1118                 for (idx = 0; idx < 4; idx++, val >>= 8, pos++) {
1119                         /* first 2 bytes are tag bytes */
1120                         if (pos < 2)
1121                                 continue;
1122
1123                         if (pos >= (total + 2))
1124                                 goto out;
1125                         msg->buf[qup->pos + msg_offset] = val & 0xff;
1126                         qup->pos++;
1127                 }
1128         }
1129
1130 out:
1131         qup->blk.data_len -= total;
1132
1133         return ret;
1134 }
1135
1136 static int qup_i2c_read_one_v2(struct qup_i2c_dev *qup, struct i2c_msg *msg)
1137 {
1138         int ret = 0;
1139
1140         qup->msg = msg;
1141         qup->pos  = 0;
1142         enable_irq(qup->irq);
1143         qup_i2c_set_blk_data(qup, msg);
1144         qup_i2c_set_read_mode_v2(qup, msg->len);
1145
1146         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
1147         if (ret)
1148                 goto err;
1149
1150         writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);
1151
1152         do {
1153                 ret = qup_i2c_issue_xfer_v2(qup, msg);
1154                 if (ret)
1155                         goto err;
1156
1157                 ret = qup_i2c_wait_for_complete(qup, msg);
1158                 if (ret)
1159                         goto err;
1160
1161                 ret = qup_i2c_read_fifo_v2(qup, msg);
1162                 if (ret)
1163                         goto err;
1164
1165                 qup->blk.pos++;
1166
1167                 /* Handle SMBus block read length */
1168                 if (qup_i2c_check_msg_len(msg) && (msg->len == 1)) {
1169                         if (msg->buf[0] > I2C_SMBUS_BLOCK_MAX) {
1170                                 ret = -EPROTO;
1171                                 goto err;
1172                         }
1173                         msg->len += msg->buf[0];
1174                         qup->pos = 0;
1175                         qup_i2c_set_blk_data(qup, msg);
1176                         /* set tag length for block read */
1177                         qup->blk.tx_tag_len = 2;
1178                         qup_i2c_set_read_mode_v2(qup, msg->buf[0]);
1179                 }
1180         } while (qup->blk.pos < qup->blk.count);
1181
1182 err:
1183         disable_irq(qup->irq);
1184         qup->msg = NULL;
1185
1186         return ret;
1187 }
1188
1189 static int qup_i2c_read_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
1190 {
1191         int ret;
1192
1193         qup->msg = msg;
1194         qup->pos  = 0;
1195
1196         enable_irq(qup->irq);
1197         qup_i2c_set_read_mode(qup, msg->len);
1198
1199         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
1200         if (ret)
1201                 goto err;
1202
1203         writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);
1204
1205         ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
1206         if (ret)
1207                 goto err;
1208
1209         qup_i2c_issue_read(qup, msg);
1210
1211         ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
1212         if (ret)
1213                 goto err;
1214
1215         do {
1216                 ret = qup_i2c_wait_for_complete(qup, msg);
1217                 if (ret)
1218                         goto err;
1219
1220                 ret = qup_i2c_read_fifo(qup, msg);
1221                 if (ret)
1222                         goto err;
1223         } while (qup->pos < msg->len);
1224
1225 err:
1226         disable_irq(qup->irq);
1227         qup->msg = NULL;
1228
1229         return ret;
1230 }
1231
1232 static int qup_i2c_xfer(struct i2c_adapter *adap,
1233                         struct i2c_msg msgs[],
1234                         int num)
1235 {
1236         struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
1237         int ret, idx;
1238
1239         ret = pm_runtime_get_sync(qup->dev);
1240         if (ret < 0)
1241                 goto out;
1242
1243         qup->bus_err = 0;
1244         qup->qup_err = 0;
1245
1246         writel(1, qup->base + QUP_SW_RESET);
1247         ret = qup_i2c_poll_state(qup, QUP_RESET_STATE);
1248         if (ret)
1249                 goto out;
1250
1251         /* Configure QUP as I2C mini core */
1252         writel(I2C_MINI_CORE | I2C_N_VAL, qup->base + QUP_CONFIG);
1253
1254         for (idx = 0; idx < num; idx++) {
1255                 if (msgs[idx].len == 0) {
1256                         ret = -EINVAL;
1257                         goto out;
1258                 }
1259
1260                 if (qup_i2c_poll_state_i2c_master(qup)) {
1261                         ret = -EIO;
1262                         goto out;
1263                 }
1264
1265                 if (qup_i2c_check_msg_len(&msgs[idx])) {
1266                         ret = -EINVAL;
1267                         goto out;
1268                 }
1269
1270                 if (msgs[idx].flags & I2C_M_RD)
1271                         ret = qup_i2c_read_one(qup, &msgs[idx]);
1272                 else
1273                         ret = qup_i2c_write_one(qup, &msgs[idx]);
1274
1275                 if (ret)
1276                         break;
1277
1278                 ret = qup_i2c_change_state(qup, QUP_RESET_STATE);
1279                 if (ret)
1280                         break;
1281         }
1282
1283         if (ret == 0)
1284                 ret = num;
1285 out:
1286
1287         pm_runtime_mark_last_busy(qup->dev);
1288         pm_runtime_put_autosuspend(qup->dev);
1289
1290         return ret;
1291 }
1292
1293 static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
1294                            struct i2c_msg msgs[],
1295                            int num)
1296 {
1297         struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
1298         int ret, len, idx = 0, use_dma = 0;
1299
1300         qup->bus_err = 0;
1301         qup->qup_err = 0;
1302
1303         ret = pm_runtime_get_sync(qup->dev);
1304         if (ret < 0)
1305                 goto out;
1306
1307         writel(1, qup->base + QUP_SW_RESET);
1308         ret = qup_i2c_poll_state(qup, QUP_RESET_STATE);
1309         if (ret)
1310                 goto out;
1311
1312         /* Configure QUP as I2C mini core */
1313         writel(I2C_MINI_CORE | I2C_N_VAL_V2, qup->base + QUP_CONFIG);
1314         writel(QUP_V2_TAGS_EN, qup->base + QUP_I2C_MASTER_GEN);
1315
1316         if ((qup->is_dma)) {
1317                 /* All i2c_msgs should be transferred using either dma or cpu */
1318                 for (idx = 0; idx < num; idx++) {
1319                         if (msgs[idx].len == 0) {
1320                                 ret = -EINVAL;
1321                                 goto out;
1322                         }
1323
1324                         len = (msgs[idx].len > qup->out_fifo_sz) ||
1325                               (msgs[idx].len > qup->in_fifo_sz);
1326
1327                         if ((!is_vmalloc_addr(msgs[idx].buf)) && len) {
1328                                 use_dma = 1;
1329                          } else {
1330                                 use_dma = 0;
1331                                 break;
1332                         }
1333                 }
1334         }
1335
1336         idx = 0;
1337
1338         do {
1339                 if (msgs[idx].len == 0) {
1340                         ret = -EINVAL;
1341                         goto out;
1342                 }
1343
1344                 if (qup_i2c_poll_state_i2c_master(qup)) {
1345                         ret = -EIO;
1346                         goto out;
1347                 }
1348
1349                 qup->is_last = (idx == (num - 1));
1350                 if (idx)
1351                         qup->config_run = QUP_I2C_MX_CONFIG_DURING_RUN;
1352                 else
1353                         qup->config_run = 0;
1354
1355                 reinit_completion(&qup->xfer);
1356
1357                 if (use_dma) {
1358                         ret = qup_i2c_bam_xfer(adap, &msgs[idx], num);
1359                 } else {
1360                         if (msgs[idx].flags & I2C_M_RD)
1361                                 ret = qup_i2c_read_one_v2(qup, &msgs[idx]);
1362                         else
1363                                 ret = qup_i2c_write_one_v2(qup, &msgs[idx]);
1364                 }
1365         } while ((idx++ < (num - 1)) && !use_dma && !ret);
1366
1367         if (!ret)
1368                 ret = qup_i2c_change_state(qup, QUP_RESET_STATE);
1369
1370         if (ret == 0)
1371                 ret = num;
1372 out:
1373         pm_runtime_mark_last_busy(qup->dev);
1374         pm_runtime_put_autosuspend(qup->dev);
1375
1376         return ret;
1377 }
1378
1379 static u32 qup_i2c_func(struct i2c_adapter *adap)
1380 {
1381         return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
1382 }
1383
1384 static const struct i2c_algorithm qup_i2c_algo = {
1385         .master_xfer    = qup_i2c_xfer,
1386         .functionality  = qup_i2c_func,
1387 };
1388
1389 static const struct i2c_algorithm qup_i2c_algo_v2 = {
1390         .master_xfer    = qup_i2c_xfer_v2,
1391         .functionality  = qup_i2c_func,
1392 };
1393
1394 /*
1395  * The QUP block will issue a NACK and STOP on the bus when reaching
1396  * the end of the read, the length of the read is specified as one byte
1397  * which limits the possible read to 256 (QUP_READ_LIMIT) bytes.
1398  */
1399 static struct i2c_adapter_quirks qup_i2c_quirks = {
1400         .max_read_len = QUP_READ_LIMIT,
1401 };
1402
1403 static void qup_i2c_enable_clocks(struct qup_i2c_dev *qup)
1404 {
1405         clk_prepare_enable(qup->clk);
1406         clk_prepare_enable(qup->pclk);
1407 }
1408
1409 static void qup_i2c_disable_clocks(struct qup_i2c_dev *qup)
1410 {
1411         u32 config;
1412
1413         qup_i2c_change_state(qup, QUP_RESET_STATE);
1414         clk_disable_unprepare(qup->clk);
1415         config = readl(qup->base + QUP_CONFIG);
1416         config |= QUP_CLOCK_AUTO_GATE;
1417         writel(config, qup->base + QUP_CONFIG);
1418         clk_disable_unprepare(qup->pclk);
1419 }
1420
1421 static int qup_i2c_probe(struct platform_device *pdev)
1422 {
1423         static const int blk_sizes[] = {4, 16, 32};
1424         struct qup_i2c_dev *qup;
1425         unsigned long one_bit_t;
1426         struct resource *res;
1427         u32 io_mode, hw_ver, size;
1428         int ret, fs_div, hs_div;
1429         u32 src_clk_freq = DEFAULT_SRC_CLK;
1430         u32 clk_freq = DEFAULT_CLK_FREQ;
1431         int blocks;
1432
1433         qup = devm_kzalloc(&pdev->dev, sizeof(*qup), GFP_KERNEL);
1434         if (!qup)
1435                 return -ENOMEM;
1436
1437         qup->dev = &pdev->dev;
1438         init_completion(&qup->xfer);
1439         platform_set_drvdata(pdev, qup);
1440
1441         ret = device_property_read_u32(qup->dev, "clock-frequency", &clk_freq);
1442         if (ret) {
1443                 dev_notice(qup->dev, "using default clock-frequency %d",
1444                         DEFAULT_CLK_FREQ);
1445         }
1446
1447         if (of_device_is_compatible(pdev->dev.of_node, "qcom,i2c-qup-v1.1.1")) {
1448                 qup->adap.algo = &qup_i2c_algo;
1449                 qup->adap.quirks = &qup_i2c_quirks;
1450         } else {
1451                 qup->adap.algo = &qup_i2c_algo_v2;
1452                 ret = qup_i2c_req_dma(qup);
1453
1454                 if (ret == -EPROBE_DEFER)
1455                         goto fail_dma;
1456                 else if (ret != 0)
1457                         goto nodma;
1458
1459                 blocks = (MX_BLOCKS << 1) + 1;
1460                 qup->btx.sg = devm_kzalloc(&pdev->dev,
1461                                            sizeof(*qup->btx.sg) * blocks,
1462                                            GFP_KERNEL);
1463                 if (!qup->btx.sg) {
1464                         ret = -ENOMEM;
1465                         goto fail_dma;
1466                 }
1467                 sg_init_table(qup->btx.sg, blocks);
1468
1469                 qup->brx.sg = devm_kzalloc(&pdev->dev,
1470                                            sizeof(*qup->brx.sg) * blocks,
1471                                            GFP_KERNEL);
1472                 if (!qup->brx.sg) {
1473                         ret = -ENOMEM;
1474                         goto fail_dma;
1475                 }
1476                 sg_init_table(qup->brx.sg, blocks);
1477
1478                 /* 2 tag bytes for each block + 5 for start, stop tags */
1479                 size = blocks * 2 + 5;
1480
1481                 qup->start_tag.start = devm_kzalloc(&pdev->dev,
1482                                                     size, GFP_KERNEL);
1483                 if (!qup->start_tag.start) {
1484                         ret = -ENOMEM;
1485                         goto fail_dma;
1486                 }
1487
1488                 qup->brx.tag.start = devm_kzalloc(&pdev->dev, 2, GFP_KERNEL);
1489                 if (!qup->brx.tag.start) {
1490                         ret = -ENOMEM;
1491                         goto fail_dma;
1492                 }
1493
1494                 qup->btx.tag.start = devm_kzalloc(&pdev->dev, 2, GFP_KERNEL);
1495                 if (!qup->btx.tag.start) {
1496                         ret = -ENOMEM;
1497                         goto fail_dma;
1498                 }
1499                 qup->is_dma = true;
1500         }
1501
1502 nodma:
1503         /* We support frequencies up to FAST Mode (400KHz) */
1504         if (!clk_freq || clk_freq > 400000) {
1505                 dev_err(qup->dev, "clock frequency not supported %d\n",
1506                         clk_freq);
1507                 return -EINVAL;
1508         }
1509
1510         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1511         qup->base = devm_ioremap_resource(qup->dev, res);
1512         if (IS_ERR(qup->base))
1513                 return PTR_ERR(qup->base);
1514
1515         qup->irq = platform_get_irq(pdev, 0);
1516         if (qup->irq < 0) {
1517                 dev_err(qup->dev, "No IRQ defined\n");
1518                 return qup->irq;
1519         }
1520
1521         if (has_acpi_companion(qup->dev)) {
1522                 ret = device_property_read_u32(qup->dev,
1523                                 "src-clock-hz", &src_clk_freq);
1524                 if (ret) {
1525                         dev_notice(qup->dev, "using default src-clock-hz %d",
1526                                 DEFAULT_SRC_CLK);
1527                 }
1528                 ACPI_COMPANION_SET(&qup->adap.dev, ACPI_COMPANION(qup->dev));
1529         } else {
1530                 qup->clk = devm_clk_get(qup->dev, "core");
1531                 if (IS_ERR(qup->clk)) {
1532                         dev_err(qup->dev, "Could not get core clock\n");
1533                         return PTR_ERR(qup->clk);
1534                 }
1535
1536                 qup->pclk = devm_clk_get(qup->dev, "iface");
1537                 if (IS_ERR(qup->pclk)) {
1538                         dev_err(qup->dev, "Could not get iface clock\n");
1539                         return PTR_ERR(qup->pclk);
1540                 }
1541                 qup_i2c_enable_clocks(qup);
1542                 src_clk_freq = clk_get_rate(qup->clk);
1543         }
1544
1545         /*
1546          * Bootloaders might leave a pending interrupt on certain QUP's,
1547          * so we reset the core before registering for interrupts.
1548          */
1549         writel(1, qup->base + QUP_SW_RESET);
1550         ret = qup_i2c_poll_state_valid(qup);
1551         if (ret)
1552                 goto fail;
1553
1554         ret = devm_request_irq(qup->dev, qup->irq, qup_i2c_interrupt,
1555                                IRQF_TRIGGER_HIGH, "i2c_qup", qup);
1556         if (ret) {
1557                 dev_err(qup->dev, "Request %d IRQ failed\n", qup->irq);
1558                 goto fail;
1559         }
1560         disable_irq(qup->irq);
1561
1562         hw_ver = readl(qup->base + QUP_HW_VERSION);
1563         dev_dbg(qup->dev, "Revision %x\n", hw_ver);
1564
1565         io_mode = readl(qup->base + QUP_IO_MODE);
1566
1567         /*
1568          * The block/fifo size w.r.t. 'actual data' is 1/2 due to 'tag'
1569          * associated with each byte written/received
1570          */
1571         size = QUP_OUTPUT_BLOCK_SIZE(io_mode);
1572         if (size >= ARRAY_SIZE(blk_sizes)) {
1573                 ret = -EIO;
1574                 goto fail;
1575         }
1576         qup->out_blk_sz = blk_sizes[size] / 2;
1577
1578         size = QUP_INPUT_BLOCK_SIZE(io_mode);
1579         if (size >= ARRAY_SIZE(blk_sizes)) {
1580                 ret = -EIO;
1581                 goto fail;
1582         }
1583         qup->in_blk_sz = blk_sizes[size] / 2;
1584
1585         size = QUP_OUTPUT_FIFO_SIZE(io_mode);
1586         qup->out_fifo_sz = qup->out_blk_sz * (2 << size);
1587
1588         size = QUP_INPUT_FIFO_SIZE(io_mode);
1589         qup->in_fifo_sz = qup->in_blk_sz * (2 << size);
1590
1591         fs_div = ((src_clk_freq / clk_freq) / 2) - 3;
1592         hs_div = 3;
1593         qup->clk_ctl = (hs_div << 8) | (fs_div & 0xff);
1594
1595         /*
1596          * Time it takes for a byte to be clocked out on the bus.
1597          * Each byte takes 9 clock cycles (8 bits + 1 ack).
1598          */
1599         one_bit_t = (USEC_PER_SEC / clk_freq) + 1;
1600         qup->one_byte_t = one_bit_t * 9;
1601
1602         dev_dbg(qup->dev, "IN:block:%d, fifo:%d, OUT:block:%d, fifo:%d\n",
1603                 qup->in_blk_sz, qup->in_fifo_sz,
1604                 qup->out_blk_sz, qup->out_fifo_sz);
1605
1606         i2c_set_adapdata(&qup->adap, qup);
1607         qup->adap.dev.parent = qup->dev;
1608         qup->adap.dev.of_node = pdev->dev.of_node;
1609         qup->is_last = true;
1610
1611         strlcpy(qup->adap.name, "QUP I2C adapter", sizeof(qup->adap.name));
1612
1613         pm_runtime_set_autosuspend_delay(qup->dev, MSEC_PER_SEC);
1614         pm_runtime_use_autosuspend(qup->dev);
1615         pm_runtime_set_active(qup->dev);
1616         pm_runtime_enable(qup->dev);
1617
1618         ret = i2c_add_adapter(&qup->adap);
1619         if (ret)
1620                 goto fail_runtime;
1621
1622         return 0;
1623
1624 fail_runtime:
1625         pm_runtime_disable(qup->dev);
1626         pm_runtime_set_suspended(qup->dev);
1627 fail:
1628         qup_i2c_disable_clocks(qup);
1629 fail_dma:
1630         if (qup->btx.dma)
1631                 dma_release_channel(qup->btx.dma);
1632         if (qup->brx.dma)
1633                 dma_release_channel(qup->brx.dma);
1634         return ret;
1635 }
1636
1637 static int qup_i2c_remove(struct platform_device *pdev)
1638 {
1639         struct qup_i2c_dev *qup = platform_get_drvdata(pdev);
1640
1641         if (qup->is_dma) {
1642                 dma_release_channel(qup->btx.dma);
1643                 dma_release_channel(qup->brx.dma);
1644         }
1645
1646         disable_irq(qup->irq);
1647         qup_i2c_disable_clocks(qup);
1648         i2c_del_adapter(&qup->adap);
1649         pm_runtime_disable(qup->dev);
1650         pm_runtime_set_suspended(qup->dev);
1651         return 0;
1652 }
1653
1654 #ifdef CONFIG_PM
1655 static int qup_i2c_pm_suspend_runtime(struct device *device)
1656 {
1657         struct qup_i2c_dev *qup = dev_get_drvdata(device);
1658
1659         dev_dbg(device, "pm_runtime: suspending...\n");
1660         qup_i2c_disable_clocks(qup);
1661         return 0;
1662 }
1663
1664 static int qup_i2c_pm_resume_runtime(struct device *device)
1665 {
1666         struct qup_i2c_dev *qup = dev_get_drvdata(device);
1667
1668         dev_dbg(device, "pm_runtime: resuming...\n");
1669         qup_i2c_enable_clocks(qup);
1670         return 0;
1671 }
1672 #endif
1673
1674 #ifdef CONFIG_PM_SLEEP
1675 static int qup_i2c_suspend(struct device *device)
1676 {
1677         if (!pm_runtime_suspended(device))
1678                 return qup_i2c_pm_suspend_runtime(device);
1679         return 0;
1680 }
1681
1682 static int qup_i2c_resume(struct device *device)
1683 {
1684         qup_i2c_pm_resume_runtime(device);
1685         pm_runtime_mark_last_busy(device);
1686         pm_request_autosuspend(device);
1687         return 0;
1688 }
1689 #endif
1690
1691 static const struct dev_pm_ops qup_i2c_qup_pm_ops = {
1692         SET_SYSTEM_SLEEP_PM_OPS(
1693                 qup_i2c_suspend,
1694                 qup_i2c_resume)
1695         SET_RUNTIME_PM_OPS(
1696                 qup_i2c_pm_suspend_runtime,
1697                 qup_i2c_pm_resume_runtime,
1698                 NULL)
1699 };
1700
1701 static const struct of_device_id qup_i2c_dt_match[] = {
1702         { .compatible = "qcom,i2c-qup-v1.1.1" },
1703         { .compatible = "qcom,i2c-qup-v2.1.1" },
1704         { .compatible = "qcom,i2c-qup-v2.2.1" },
1705         {}
1706 };
1707 MODULE_DEVICE_TABLE(of, qup_i2c_dt_match);
1708
1709 #if IS_ENABLED(CONFIG_ACPI)
1710 static const struct acpi_device_id qup_i2c_acpi_match[] = {
1711         { "QCOM8010"},
1712         { },
1713 };
1714 MODULE_DEVICE_TABLE(acpi, qup_i2c_acpi_match);
1715 #endif
1716
1717 static struct platform_driver qup_i2c_driver = {
1718         .probe  = qup_i2c_probe,
1719         .remove = qup_i2c_remove,
1720         .driver = {
1721                 .name = "i2c_qup",
1722                 .pm = &qup_i2c_qup_pm_ops,
1723                 .of_match_table = qup_i2c_dt_match,
1724                 .acpi_match_table = ACPI_PTR(qup_i2c_acpi_match),
1725         },
1726 };
1727
1728 module_platform_driver(qup_i2c_driver);
1729
1730 MODULE_LICENSE("GPL v2");
1731 MODULE_ALIAS("platform:i2c_qup");