1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2009-2013, 2016-2018, The Linux Foundation. All rights reserved. 4 * Copyright (c) 2014, Sony Mobile Communications AB. 5 * 6 */ 7 8 #include <linux/acpi.h> 9 #include <linux/atomic.h> 10 #include <linux/clk.h> 11 #include <linux/delay.h> 12 #include <linux/dmaengine.h> 13 #include <linux/dmapool.h> 14 #include <linux/dma-mapping.h> 15 #include <linux/err.h> 16 #include <linux/i2c.h> 17 #include <linux/interrupt.h> 18 #include <linux/io.h> 19 #include <linux/module.h> 20 #include <linux/of.h> 21 #include <linux/platform_device.h> 22 #include <linux/pm_runtime.h> 23 #include <linux/scatterlist.h> 24 25 /* QUP Registers */ 26 #define QUP_CONFIG 0x000 27 #define QUP_STATE 0x004 28 #define QUP_IO_MODE 0x008 29 #define QUP_SW_RESET 0x00c 30 #define QUP_OPERATIONAL 0x018 31 #define QUP_ERROR_FLAGS 0x01c 32 #define QUP_ERROR_FLAGS_EN 0x020 33 #define QUP_OPERATIONAL_MASK 0x028 34 #define QUP_HW_VERSION 0x030 35 #define QUP_MX_OUTPUT_CNT 0x100 36 #define QUP_OUT_FIFO_BASE 0x110 37 #define QUP_MX_WRITE_CNT 0x150 38 #define QUP_MX_INPUT_CNT 0x200 39 #define QUP_MX_READ_CNT 0x208 40 #define QUP_IN_FIFO_BASE 0x218 41 #define QUP_I2C_CLK_CTL 0x400 42 #define QUP_I2C_STATUS 0x404 43 #define QUP_I2C_MASTER_GEN 0x408 44 45 /* QUP States and reset values */ 46 #define QUP_RESET_STATE 0 47 #define QUP_RUN_STATE 1 48 #define QUP_PAUSE_STATE 3 49 #define QUP_STATE_MASK 3 50 51 #define QUP_STATE_VALID BIT(2) 52 #define QUP_I2C_MAST_GEN BIT(4) 53 #define QUP_I2C_FLUSH BIT(6) 54 55 #define QUP_OPERATIONAL_RESET 0x000ff0 56 #define QUP_I2C_STATUS_RESET 0xfffffc 57 58 /* QUP OPERATIONAL FLAGS */ 59 #define QUP_I2C_NACK_FLAG BIT(3) 60 #define QUP_OUT_NOT_EMPTY BIT(4) 61 #define QUP_IN_NOT_EMPTY BIT(5) 62 #define QUP_OUT_FULL BIT(6) 63 #define QUP_OUT_SVC_FLAG BIT(8) 64 #define QUP_IN_SVC_FLAG BIT(9) 65 #define QUP_MX_OUTPUT_DONE BIT(10) 66 #define QUP_MX_INPUT_DONE BIT(11) 67 #define OUT_BLOCK_WRITE_REQ BIT(12) 68 #define IN_BLOCK_READ_REQ BIT(13) 69 70 /* I2C mini core related values */ 71 #define QUP_NO_INPUT BIT(7) 72 #define QUP_CLOCK_AUTO_GATE BIT(13) 73 #define I2C_MINI_CORE (2 << 8) 74 #define I2C_N_VAL 15 75 #define I2C_N_VAL_V2 7 76 77 /* Most significant word offset in FIFO port */ 78 #define QUP_MSW_SHIFT (I2C_N_VAL + 1) 79 80 /* Packing/Unpacking words in FIFOs, and IO modes */ 81 #define QUP_OUTPUT_BLK_MODE (1 << 10) 82 #define QUP_OUTPUT_BAM_MODE (3 << 10) 83 #define QUP_INPUT_BLK_MODE (1 << 12) 84 #define QUP_INPUT_BAM_MODE (3 << 12) 85 #define QUP_BAM_MODE (QUP_OUTPUT_BAM_MODE | QUP_INPUT_BAM_MODE) 86 #define QUP_UNPACK_EN BIT(14) 87 #define QUP_PACK_EN BIT(15) 88 89 #define QUP_REPACK_EN (QUP_UNPACK_EN | QUP_PACK_EN) 90 #define QUP_V2_TAGS_EN 1 91 92 #define QUP_OUTPUT_BLOCK_SIZE(x)(((x) >> 0) & 0x03) 93 #define QUP_OUTPUT_FIFO_SIZE(x) (((x) >> 2) & 0x07) 94 #define QUP_INPUT_BLOCK_SIZE(x) (((x) >> 5) & 0x03) 95 #define QUP_INPUT_FIFO_SIZE(x) (((x) >> 7) & 0x07) 96 97 /* QUP tags */ 98 #define QUP_TAG_START (1 << 8) 99 #define QUP_TAG_DATA (2 << 8) 100 #define QUP_TAG_STOP (3 << 8) 101 #define QUP_TAG_REC (4 << 8) 102 #define QUP_BAM_INPUT_EOT 0x93 103 #define QUP_BAM_FLUSH_STOP 0x96 104 105 /* QUP v2 tags */ 106 #define QUP_TAG_V2_START 0x81 107 #define QUP_TAG_V2_DATAWR 0x82 108 #define QUP_TAG_V2_DATAWR_STOP 0x83 109 #define QUP_TAG_V2_DATARD 0x85 110 #define QUP_TAG_V2_DATARD_NACK 0x86 111 #define QUP_TAG_V2_DATARD_STOP 0x87 112 113 /* Status, Error flags */ 114 #define I2C_STATUS_WR_BUFFER_FULL BIT(0) 115 #define I2C_STATUS_BUS_ACTIVE BIT(8) 116 #define I2C_STATUS_ERROR_MASK 0x38000fc 117 #define QUP_STATUS_ERROR_FLAGS 0x7c 118 119 #define QUP_READ_LIMIT 256 120 #define SET_BIT 0x1 121 #define RESET_BIT 0x0 122 #define ONE_BYTE 0x1 123 #define QUP_I2C_MX_CONFIG_DURING_RUN BIT(31) 124 125 /* Maximum transfer length for single DMA descriptor */ 126 #define MX_TX_RX_LEN SZ_64K 127 #define MX_BLOCKS (MX_TX_RX_LEN / QUP_READ_LIMIT) 128 /* Maximum transfer length for all DMA descriptors */ 129 #define MX_DMA_TX_RX_LEN (2 * MX_TX_RX_LEN) 130 #define MX_DMA_BLOCKS (MX_DMA_TX_RX_LEN / QUP_READ_LIMIT) 131 132 /* 133 * Minimum transfer timeout for i2c transfers in seconds. It will be added on 134 * the top of maximum transfer time calculated from i2c bus speed to compensate 135 * the overheads. 136 */ 137 #define TOUT_MIN 2 138 139 /* Default values. Use these if FW query fails */ 140 #define DEFAULT_CLK_FREQ I2C_MAX_STANDARD_MODE_FREQ 141 #define DEFAULT_SRC_CLK 20000000 142 143 /* 144 * Max tags length (start, stop and maximum 2 bytes address) for each QUP 145 * data transfer 146 */ 147 #define QUP_MAX_TAGS_LEN 4 148 /* Max data length for each DATARD tags */ 149 #define RECV_MAX_DATA_LEN 254 150 /* TAG length for DATA READ in RX FIFO */ 151 #define READ_RX_TAGS_LEN 2 152 153 static unsigned int scl_freq; 154 module_param_named(scl_freq, scl_freq, uint, 0444); 155 MODULE_PARM_DESC(scl_freq, "SCL frequency override"); 156 157 /* 158 * count: no of blocks 159 * pos: current block number 160 * tx_tag_len: tx tag length for current block 161 * rx_tag_len: rx tag length for current block 162 * data_len: remaining data length for current message 163 * cur_blk_len: data length for current block 164 * total_tx_len: total tx length including tag bytes for current QUP transfer 165 * total_rx_len: total rx length including tag bytes for current QUP transfer 166 * tx_fifo_data_pos: current byte number in TX FIFO word 167 * tx_fifo_free: number of free bytes in current QUP block write. 168 * rx_fifo_data_pos: current byte number in RX FIFO word 169 * fifo_available: number of available bytes in RX FIFO for current 170 * QUP block read 171 * tx_fifo_data: QUP TX FIFO write works on word basis (4 bytes). New byte write 172 * to TX FIFO will be appended in this data and will be written to 173 * TX FIFO when all the 4 bytes are available. 174 * rx_fifo_data: QUP RX FIFO read works on word basis (4 bytes). This will 175 * contains the 4 bytes of RX data. 176 * cur_data: pointer to tell cur data position for current message 177 * cur_tx_tags: pointer to tell cur position in tags 178 * tx_tags_sent: all tx tag bytes have been written in FIFO word 179 * send_last_word: for tx FIFO, last word send is pending in current block 180 * rx_bytes_read: if all the bytes have been read from rx FIFO. 181 * rx_tags_fetched: all the rx tag bytes have been fetched from rx fifo word 182 * is_tx_blk_mode: whether tx uses block or FIFO mode in case of non BAM xfer. 183 * is_rx_blk_mode: whether rx uses block or FIFO mode in case of non BAM xfer. 184 * tags: contains tx tag bytes for current QUP transfer 185 */ 186 struct qup_i2c_block { 187 int count; 188 int pos; 189 int tx_tag_len; 190 int rx_tag_len; 191 int data_len; 192 int cur_blk_len; 193 int total_tx_len; 194 int total_rx_len; 195 int tx_fifo_data_pos; 196 int tx_fifo_free; 197 int rx_fifo_data_pos; 198 int fifo_available; 199 u32 tx_fifo_data; 200 u32 rx_fifo_data; 201 u8 *cur_data; 202 u8 *cur_tx_tags; 203 bool tx_tags_sent; 204 bool send_last_word; 205 bool rx_tags_fetched; 206 bool rx_bytes_read; 207 bool is_tx_blk_mode; 208 bool is_rx_blk_mode; 209 u8 tags[6]; 210 }; 211 212 struct qup_i2c_tag { 213 u8 *start; 214 dma_addr_t addr; 215 }; 216 217 struct qup_i2c_bam { 218 struct qup_i2c_tag tag; 219 struct dma_chan *dma; 220 struct scatterlist *sg; 221 unsigned int sg_cnt; 222 }; 223 224 struct qup_i2c_dev { 225 struct device *dev; 226 void __iomem *base; 227 int irq; 228 struct clk *clk; 229 struct clk *pclk; 230 struct i2c_adapter adap; 231 232 int clk_ctl; 233 int out_fifo_sz; 234 int in_fifo_sz; 235 int out_blk_sz; 236 int in_blk_sz; 237 238 int blk_xfer_limit; 239 unsigned long one_byte_t; 240 unsigned long xfer_timeout; 241 struct qup_i2c_block blk; 242 243 struct i2c_msg *msg; 244 /* Current posion in user message buffer */ 245 int pos; 246 /* I2C protocol errors */ 247 u32 bus_err; 248 /* QUP core errors */ 249 u32 qup_err; 250 251 /* To check if this is the last msg */ 252 bool is_last; 253 bool is_smbus_read; 254 255 /* To configure when bus is in run state */ 256 u32 config_run; 257 258 /* dma parameters */ 259 bool is_dma; 260 /* To check if the current transfer is using DMA */ 261 bool use_dma; 262 unsigned int max_xfer_sg_len; 263 unsigned int tag_buf_pos; 264 /* The threshold length above which block mode will be used */ 265 unsigned int blk_mode_threshold; 266 struct dma_pool *dpool; 267 struct qup_i2c_tag start_tag; 268 struct qup_i2c_bam brx; 269 struct qup_i2c_bam btx; 270 271 struct completion xfer; 272 /* function to write data in tx fifo */ 273 void (*write_tx_fifo)(struct qup_i2c_dev *qup); 274 /* function to read data from rx fifo */ 275 void (*read_rx_fifo)(struct qup_i2c_dev *qup); 276 /* function to write tags in tx fifo for i2c read transfer */ 277 void (*write_rx_tags)(struct qup_i2c_dev *qup); 278 }; 279 280 static irqreturn_t qup_i2c_interrupt(int irq, void *dev) 281 { 282 struct qup_i2c_dev *qup = dev; 283 struct qup_i2c_block *blk = &qup->blk; 284 u32 bus_err; 285 u32 qup_err; 286 u32 opflags; 287 288 bus_err = readl(qup->base + QUP_I2C_STATUS); 289 qup_err = readl(qup->base + QUP_ERROR_FLAGS); 290 opflags = readl(qup->base + QUP_OPERATIONAL); 291 292 if (!qup->msg) { 293 /* Clear Error interrupt */ 294 writel(QUP_RESET_STATE, qup->base + QUP_STATE); 295 return IRQ_HANDLED; 296 } 297 298 bus_err &= I2C_STATUS_ERROR_MASK; 299 qup_err &= QUP_STATUS_ERROR_FLAGS; 300 301 /* Clear the error bits in QUP_ERROR_FLAGS */ 302 if (qup_err) 303 writel(qup_err, qup->base + QUP_ERROR_FLAGS); 304 305 /* Clear the error bits in QUP_I2C_STATUS */ 306 if (bus_err) 307 writel(bus_err, qup->base + QUP_I2C_STATUS); 308 309 /* 310 * Check for BAM mode and returns if already error has come for current 311 * transfer. In Error case, sometimes, QUP generates more than one 312 * interrupt. 313 */ 314 if (qup->use_dma && (qup->qup_err || qup->bus_err)) 315 return IRQ_HANDLED; 316 317 /* Reset the QUP State in case of error */ 318 if (qup_err || bus_err) { 319 /* 320 * Don’t reset the QUP state in case of BAM mode. The BAM 321 * flush operation needs to be scheduled in transfer function 322 * which will clear the remaining schedule descriptors in BAM 323 * HW FIFO and generates the BAM interrupt. 324 */ 325 if (!qup->use_dma) 326 writel(QUP_RESET_STATE, qup->base + QUP_STATE); 327 goto done; 328 } 329 330 if (opflags & QUP_OUT_SVC_FLAG) { 331 writel(QUP_OUT_SVC_FLAG, qup->base + QUP_OPERATIONAL); 332 333 if (opflags & OUT_BLOCK_WRITE_REQ) { 334 blk->tx_fifo_free += qup->out_blk_sz; 335 if (qup->msg->flags & I2C_M_RD) 336 qup->write_rx_tags(qup); 337 else 338 qup->write_tx_fifo(qup); 339 } 340 } 341 342 if (opflags & QUP_IN_SVC_FLAG) { 343 writel(QUP_IN_SVC_FLAG, qup->base + QUP_OPERATIONAL); 344 345 if (!blk->is_rx_blk_mode) { 346 blk->fifo_available += qup->in_fifo_sz; 347 qup->read_rx_fifo(qup); 348 } else if (opflags & IN_BLOCK_READ_REQ) { 349 blk->fifo_available += qup->in_blk_sz; 350 qup->read_rx_fifo(qup); 351 } 352 } 353 354 if (qup->msg->flags & I2C_M_RD) { 355 if (!blk->rx_bytes_read) 356 return IRQ_HANDLED; 357 } else { 358 /* 359 * Ideally, QUP_MAX_OUTPUT_DONE_FLAG should be checked 360 * for FIFO mode also. But, QUP_MAX_OUTPUT_DONE_FLAG lags 361 * behind QUP_OUTPUT_SERVICE_FLAG sometimes. The only reason 362 * of interrupt for write message in FIFO mode is 363 * QUP_MAX_OUTPUT_DONE_FLAG condition. 364 */ 365 if (blk->is_tx_blk_mode && !(opflags & QUP_MX_OUTPUT_DONE)) 366 return IRQ_HANDLED; 367 } 368 369 done: 370 qup->qup_err = qup_err; 371 qup->bus_err = bus_err; 372 complete(&qup->xfer); 373 return IRQ_HANDLED; 374 } 375 376 static int qup_i2c_poll_state_mask(struct qup_i2c_dev *qup, 377 u32 req_state, u32 req_mask) 378 { 379 int retries = 1; 380 u32 state; 381 382 /* 383 * State transition takes 3 AHB clocks cycles + 3 I2C master clock 384 * cycles. So retry once after a 1uS delay. 385 */ 386 do { 387 state = readl(qup->base + QUP_STATE); 388 389 if (state & QUP_STATE_VALID && 390 (state & req_mask) == req_state) 391 return 0; 392 393 udelay(1); 394 } while (retries--); 395 396 return -ETIMEDOUT; 397 } 398 399 static int qup_i2c_poll_state(struct qup_i2c_dev *qup, u32 req_state) 400 { 401 return qup_i2c_poll_state_mask(qup, req_state, QUP_STATE_MASK); 402 } 403 404 static void qup_i2c_flush(struct qup_i2c_dev *qup) 405 { 406 u32 val = readl(qup->base + QUP_STATE); 407 408 val |= QUP_I2C_FLUSH; 409 writel(val, qup->base + QUP_STATE); 410 } 411 412 static int qup_i2c_poll_state_valid(struct qup_i2c_dev *qup) 413 { 414 return qup_i2c_poll_state_mask(qup, 0, 0); 415 } 416 417 static int qup_i2c_poll_state_i2c_master(struct qup_i2c_dev *qup) 418 { 419 return qup_i2c_poll_state_mask(qup, QUP_I2C_MAST_GEN, QUP_I2C_MAST_GEN); 420 } 421 422 static int qup_i2c_change_state(struct qup_i2c_dev *qup, u32 state) 423 { 424 if (qup_i2c_poll_state_valid(qup) != 0) 425 return -EIO; 426 427 writel(state, qup->base + QUP_STATE); 428 429 if (qup_i2c_poll_state(qup, state) != 0) 430 return -EIO; 431 return 0; 432 } 433 434 /* Check if I2C bus returns to IDLE state */ 435 static int qup_i2c_bus_active(struct qup_i2c_dev *qup, int len) 436 { 437 unsigned long timeout; 438 u32 status; 439 int ret = 0; 440 441 timeout = jiffies + len * 4; 442 for (;;) { 443 status = readl(qup->base + QUP_I2C_STATUS); 444 if (!(status & I2C_STATUS_BUS_ACTIVE)) 445 break; 446 447 if (time_after(jiffies, timeout)) 448 ret = -ETIMEDOUT; 449 450 usleep_range(len, len * 2); 451 } 452 453 return ret; 454 } 455 456 static void qup_i2c_write_tx_fifo_v1(struct qup_i2c_dev *qup) 457 { 458 struct qup_i2c_block *blk = &qup->blk; 459 struct i2c_msg *msg = qup->msg; 460 u32 addr = i2c_8bit_addr_from_msg(msg); 461 u32 qup_tag; 462 int idx; 463 u32 val; 464 465 if (qup->pos == 0) { 466 val = QUP_TAG_START | addr; 467 idx = 1; 468 blk->tx_fifo_free--; 469 } else { 470 val = 0; 471 idx = 0; 472 } 473 474 while (blk->tx_fifo_free && qup->pos < msg->len) { 475 if (qup->pos == msg->len - 1) 476 qup_tag = QUP_TAG_STOP; 477 else 478 qup_tag = QUP_TAG_DATA; 479 480 if (idx & 1) 481 val |= (qup_tag | msg->buf[qup->pos]) << QUP_MSW_SHIFT; 482 else 483 val = qup_tag | msg->buf[qup->pos]; 484 485 /* Write out the pair and the last odd value */ 486 if (idx & 1 || qup->pos == msg->len - 1) 487 writel(val, qup->base + QUP_OUT_FIFO_BASE); 488 489 qup->pos++; 490 idx++; 491 blk->tx_fifo_free--; 492 } 493 } 494 495 static void qup_i2c_set_blk_data(struct qup_i2c_dev *qup, 496 struct i2c_msg *msg) 497 { 498 qup->blk.pos = 0; 499 qup->blk.data_len = msg->len; 500 qup->blk.count = DIV_ROUND_UP(msg->len, qup->blk_xfer_limit); 501 } 502 503 static int qup_i2c_get_data_len(struct qup_i2c_dev *qup) 504 { 505 int data_len; 506 507 if (qup->blk.data_len > qup->blk_xfer_limit) 508 data_len = qup->blk_xfer_limit; 509 else 510 data_len = qup->blk.data_len; 511 512 return data_len; 513 } 514 515 static bool qup_i2c_check_msg_len(struct i2c_msg *msg) 516 { 517 return ((msg->flags & I2C_M_RD) && (msg->flags & I2C_M_RECV_LEN)); 518 } 519 520 static int qup_i2c_set_tags_smb(u16 addr, u8 *tags, struct qup_i2c_dev *qup, 521 struct i2c_msg *msg) 522 { 523 int len = 0; 524 525 if (qup->is_smbus_read) { 526 tags[len++] = QUP_TAG_V2_DATARD_STOP; 527 tags[len++] = qup_i2c_get_data_len(qup); 528 } else { 529 tags[len++] = QUP_TAG_V2_START; 530 tags[len++] = addr & 0xff; 531 532 if (msg->flags & I2C_M_TEN) 533 tags[len++] = addr >> 8; 534 535 tags[len++] = QUP_TAG_V2_DATARD; 536 /* Read 1 byte indicating the length of the SMBus message */ 537 tags[len++] = 1; 538 } 539 return len; 540 } 541 542 static int qup_i2c_set_tags(u8 *tags, struct qup_i2c_dev *qup, 543 struct i2c_msg *msg) 544 { 545 u16 addr = i2c_8bit_addr_from_msg(msg); 546 int len = 0; 547 int data_len; 548 549 int last = (qup->blk.pos == (qup->blk.count - 1)) && (qup->is_last); 550 551 /* Handle tags for SMBus block read */ 552 if (qup_i2c_check_msg_len(msg)) 553 return qup_i2c_set_tags_smb(addr, tags, qup, msg); 554 555 if (qup->blk.pos == 0) { 556 tags[len++] = QUP_TAG_V2_START; 557 tags[len++] = addr & 0xff; 558 559 if (msg->flags & I2C_M_TEN) 560 tags[len++] = addr >> 8; 561 } 562 563 /* Send _STOP commands for the last block */ 564 if (last) { 565 if (msg->flags & I2C_M_RD) 566 tags[len++] = QUP_TAG_V2_DATARD_STOP; 567 else 568 tags[len++] = QUP_TAG_V2_DATAWR_STOP; 569 } else { 570 if (msg->flags & I2C_M_RD) 571 tags[len++] = qup->blk.pos == (qup->blk.count - 1) ? 572 QUP_TAG_V2_DATARD_NACK : 573 QUP_TAG_V2_DATARD; 574 else 575 tags[len++] = QUP_TAG_V2_DATAWR; 576 } 577 578 data_len = qup_i2c_get_data_len(qup); 579 580 /* 0 implies 256 bytes */ 581 if (data_len == QUP_READ_LIMIT) 582 tags[len++] = 0; 583 else 584 tags[len++] = data_len; 585 586 return len; 587 } 588 589 590 static void qup_i2c_bam_cb(void *data) 591 { 592 struct qup_i2c_dev *qup = data; 593 594 complete(&qup->xfer); 595 } 596 597 static int qup_sg_set_buf(struct scatterlist *sg, void *buf, 598 unsigned int buflen, struct qup_i2c_dev *qup, 599 int dir) 600 { 601 int ret; 602 603 sg_set_buf(sg, buf, buflen); 604 ret = dma_map_sg(qup->dev, sg, 1, dir); 605 if (!ret) 606 return -EINVAL; 607 608 return 0; 609 } 610 611 static void qup_i2c_rel_dma(struct qup_i2c_dev *qup) 612 { 613 if (qup->btx.dma) 614 dma_release_channel(qup->btx.dma); 615 if (qup->brx.dma) 616 dma_release_channel(qup->brx.dma); 617 qup->btx.dma = NULL; 618 qup->brx.dma = NULL; 619 } 620 621 static int qup_i2c_req_dma(struct qup_i2c_dev *qup) 622 { 623 int err; 624 625 if (!qup->btx.dma) { 626 qup->btx.dma = dma_request_chan(qup->dev, "tx"); 627 if (IS_ERR(qup->btx.dma)) { 628 err = PTR_ERR(qup->btx.dma); 629 qup->btx.dma = NULL; 630 dev_err(qup->dev, "\n tx channel not available"); 631 return err; 632 } 633 } 634 635 if (!qup->brx.dma) { 636 qup->brx.dma = dma_request_chan(qup->dev, "rx"); 637 if (IS_ERR(qup->brx.dma)) { 638 dev_err(qup->dev, "\n rx channel not available"); 639 err = PTR_ERR(qup->brx.dma); 640 qup->brx.dma = NULL; 641 qup_i2c_rel_dma(qup); 642 return err; 643 } 644 } 645 return 0; 646 } 647 648 static int qup_i2c_bam_make_desc(struct qup_i2c_dev *qup, struct i2c_msg *msg) 649 { 650 int ret = 0, limit = QUP_READ_LIMIT; 651 u32 len = 0, blocks, rem; 652 u32 i = 0, tlen, tx_len = 0; 653 u8 *tags; 654 655 qup->blk_xfer_limit = QUP_READ_LIMIT; 656 qup_i2c_set_blk_data(qup, msg); 657 658 blocks = qup->blk.count; 659 rem = msg->len - (blocks - 1) * limit; 660 661 if (msg->flags & I2C_M_RD) { 662 while (qup->blk.pos < blocks) { 663 tlen = (i == (blocks - 1)) ? rem : limit; 664 tags = &qup->start_tag.start[qup->tag_buf_pos + len]; 665 len += qup_i2c_set_tags(tags, qup, msg); 666 qup->blk.data_len -= tlen; 667 668 /* scratch buf to read the start and len tags */ 669 ret = qup_sg_set_buf(&qup->brx.sg[qup->brx.sg_cnt++], 670 &qup->brx.tag.start[0], 671 2, qup, DMA_FROM_DEVICE); 672 673 if (ret) 674 return ret; 675 676 ret = qup_sg_set_buf(&qup->brx.sg[qup->brx.sg_cnt++], 677 &msg->buf[limit * i], 678 tlen, qup, 679 DMA_FROM_DEVICE); 680 if (ret) 681 return ret; 682 683 i++; 684 qup->blk.pos = i; 685 } 686 ret = qup_sg_set_buf(&qup->btx.sg[qup->btx.sg_cnt++], 687 &qup->start_tag.start[qup->tag_buf_pos], 688 len, qup, DMA_TO_DEVICE); 689 if (ret) 690 return ret; 691 692 qup->tag_buf_pos += len; 693 } else { 694 while (qup->blk.pos < blocks) { 695 tlen = (i == (blocks - 1)) ? rem : limit; 696 tags = &qup->start_tag.start[qup->tag_buf_pos + tx_len]; 697 len = qup_i2c_set_tags(tags, qup, msg); 698 qup->blk.data_len -= tlen; 699 700 ret = qup_sg_set_buf(&qup->btx.sg[qup->btx.sg_cnt++], 701 tags, len, 702 qup, DMA_TO_DEVICE); 703 if (ret) 704 return ret; 705 706 tx_len += len; 707 ret = qup_sg_set_buf(&qup->btx.sg[qup->btx.sg_cnt++], 708 &msg->buf[limit * i], 709 tlen, qup, DMA_TO_DEVICE); 710 if (ret) 711 return ret; 712 i++; 713 qup->blk.pos = i; 714 } 715 716 qup->tag_buf_pos += tx_len; 717 } 718 719 return 0; 720 } 721 722 static int qup_i2c_bam_schedule_desc(struct qup_i2c_dev *qup) 723 { 724 struct dma_async_tx_descriptor *txd, *rxd = NULL; 725 int ret = 0; 726 dma_cookie_t cookie_rx, cookie_tx; 727 u32 len = 0; 728 u32 tx_cnt = qup->btx.sg_cnt, rx_cnt = qup->brx.sg_cnt; 729 730 /* schedule the EOT and FLUSH I2C tags */ 731 len = 1; 732 if (rx_cnt) { 733 qup->btx.tag.start[0] = QUP_BAM_INPUT_EOT; 734 len++; 735 736 /* scratch buf to read the BAM EOT FLUSH tags */ 737 ret = qup_sg_set_buf(&qup->brx.sg[rx_cnt++], 738 &qup->brx.tag.start[0], 739 1, qup, DMA_FROM_DEVICE); 740 if (ret) 741 return ret; 742 } 743 744 qup->btx.tag.start[len - 1] = QUP_BAM_FLUSH_STOP; 745 ret = qup_sg_set_buf(&qup->btx.sg[tx_cnt++], &qup->btx.tag.start[0], 746 len, qup, DMA_TO_DEVICE); 747 if (ret) 748 return ret; 749 750 txd = dmaengine_prep_slave_sg(qup->btx.dma, qup->btx.sg, tx_cnt, 751 DMA_MEM_TO_DEV, 752 DMA_PREP_INTERRUPT | DMA_PREP_FENCE); 753 if (!txd) { 754 dev_err(qup->dev, "failed to get tx desc\n"); 755 ret = -EINVAL; 756 goto desc_err; 757 } 758 759 if (!rx_cnt) { 760 txd->callback = qup_i2c_bam_cb; 761 txd->callback_param = qup; 762 } 763 764 cookie_tx = dmaengine_submit(txd); 765 if (dma_submit_error(cookie_tx)) { 766 ret = -EINVAL; 767 goto desc_err; 768 } 769 770 dma_async_issue_pending(qup->btx.dma); 771 772 if (rx_cnt) { 773 rxd = dmaengine_prep_slave_sg(qup->brx.dma, qup->brx.sg, 774 rx_cnt, DMA_DEV_TO_MEM, 775 DMA_PREP_INTERRUPT); 776 if (!rxd) { 777 dev_err(qup->dev, "failed to get rx desc\n"); 778 ret = -EINVAL; 779 780 /* abort TX descriptors */ 781 dmaengine_terminate_sync(qup->btx.dma); 782 goto desc_err; 783 } 784 785 rxd->callback = qup_i2c_bam_cb; 786 rxd->callback_param = qup; 787 cookie_rx = dmaengine_submit(rxd); 788 if (dma_submit_error(cookie_rx)) { 789 ret = -EINVAL; 790 goto desc_err; 791 } 792 793 dma_async_issue_pending(qup->brx.dma); 794 } 795 796 if (!wait_for_completion_timeout(&qup->xfer, qup->xfer_timeout)) { 797 dev_err(qup->dev, "normal trans timed out\n"); 798 ret = -ETIMEDOUT; 799 } 800 801 if (ret || qup->bus_err || qup->qup_err) { 802 reinit_completion(&qup->xfer); 803 804 ret = qup_i2c_change_state(qup, QUP_RUN_STATE); 805 if (ret) { 806 dev_err(qup->dev, "change to run state timed out"); 807 goto desc_err; 808 } 809 810 qup_i2c_flush(qup); 811 812 /* wait for remaining interrupts to occur */ 813 if (!wait_for_completion_timeout(&qup->xfer, HZ)) 814 dev_err(qup->dev, "flush timed out\n"); 815 816 ret = (qup->bus_err & QUP_I2C_NACK_FLAG) ? -ENXIO : -EIO; 817 } 818 819 desc_err: 820 dma_unmap_sg(qup->dev, qup->btx.sg, tx_cnt, DMA_TO_DEVICE); 821 822 if (rx_cnt) 823 dma_unmap_sg(qup->dev, qup->brx.sg, rx_cnt, 824 DMA_FROM_DEVICE); 825 826 return ret; 827 } 828 829 static void qup_i2c_bam_clear_tag_buffers(struct qup_i2c_dev *qup) 830 { 831 qup->btx.sg_cnt = 0; 832 qup->brx.sg_cnt = 0; 833 qup->tag_buf_pos = 0; 834 } 835 836 static int qup_i2c_bam_xfer(struct i2c_adapter *adap, struct i2c_msg *msg, 837 int num) 838 { 839 struct qup_i2c_dev *qup = i2c_get_adapdata(adap); 840 int ret = 0; 841 int idx = 0; 842 843 enable_irq(qup->irq); 844 ret = qup_i2c_req_dma(qup); 845 846 if (ret) 847 goto out; 848 849 writel(0, qup->base + QUP_MX_INPUT_CNT); 850 writel(0, qup->base + QUP_MX_OUTPUT_CNT); 851 852 /* set BAM mode */ 853 writel(QUP_REPACK_EN | QUP_BAM_MODE, qup->base + QUP_IO_MODE); 854 855 /* mask fifo irqs */ 856 writel((0x3 << 8), qup->base + QUP_OPERATIONAL_MASK); 857 858 /* set RUN STATE */ 859 ret = qup_i2c_change_state(qup, QUP_RUN_STATE); 860 if (ret) 861 goto out; 862 863 writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL); 864 qup_i2c_bam_clear_tag_buffers(qup); 865 866 for (idx = 0; idx < num; idx++) { 867 qup->msg = msg + idx; 868 qup->is_last = idx == (num - 1); 869 870 ret = qup_i2c_bam_make_desc(qup, qup->msg); 871 if (ret) 872 break; 873 874 /* 875 * Make DMA descriptor and schedule the BAM transfer if its 876 * already crossed the maximum length. Since the memory for all 877 * tags buffers have been taken for 2 maximum possible 878 * transfers length so it will never cross the buffer actual 879 * length. 880 */ 881 if (qup->btx.sg_cnt > qup->max_xfer_sg_len || 882 qup->brx.sg_cnt > qup->max_xfer_sg_len || 883 qup->is_last) { 884 ret = qup_i2c_bam_schedule_desc(qup); 885 if (ret) 886 break; 887 888 qup_i2c_bam_clear_tag_buffers(qup); 889 } 890 } 891 892 out: 893 disable_irq(qup->irq); 894 895 qup->msg = NULL; 896 return ret; 897 } 898 899 static int qup_i2c_wait_for_complete(struct qup_i2c_dev *qup, 900 struct i2c_msg *msg) 901 { 902 unsigned long left; 903 int ret = 0; 904 905 left = wait_for_completion_timeout(&qup->xfer, qup->xfer_timeout); 906 if (!left) { 907 writel(1, qup->base + QUP_SW_RESET); 908 ret = -ETIMEDOUT; 909 } 910 911 if (qup->bus_err || qup->qup_err) 912 ret = (qup->bus_err & QUP_I2C_NACK_FLAG) ? -ENXIO : -EIO; 913 914 return ret; 915 } 916 917 static void qup_i2c_read_rx_fifo_v1(struct qup_i2c_dev *qup) 918 { 919 struct qup_i2c_block *blk = &qup->blk; 920 struct i2c_msg *msg = qup->msg; 921 u32 val = 0; 922 int idx = 0; 923 924 while (blk->fifo_available && qup->pos < msg->len) { 925 if ((idx & 1) == 0) { 926 /* Reading 2 words at time */ 927 val = readl(qup->base + QUP_IN_FIFO_BASE); 928 msg->buf[qup->pos++] = val & 0xFF; 929 } else { 930 msg->buf[qup->pos++] = val >> QUP_MSW_SHIFT; 931 } 932 idx++; 933 blk->fifo_available--; 934 } 935 936 if (qup->pos == msg->len) 937 blk->rx_bytes_read = true; 938 } 939 940 static void qup_i2c_write_rx_tags_v1(struct qup_i2c_dev *qup) 941 { 942 struct i2c_msg *msg = qup->msg; 943 u32 addr, len, val; 944 945 addr = i2c_8bit_addr_from_msg(msg); 946 947 /* 0 is used to specify a length 256 (QUP_READ_LIMIT) */ 948 len = (msg->len == QUP_READ_LIMIT) ? 0 : msg->len; 949 950 val = ((QUP_TAG_REC | len) << QUP_MSW_SHIFT) | QUP_TAG_START | addr; 951 writel(val, qup->base + QUP_OUT_FIFO_BASE); 952 } 953 954 static void qup_i2c_conf_v1(struct qup_i2c_dev *qup) 955 { 956 struct qup_i2c_block *blk = &qup->blk; 957 u32 qup_config = I2C_MINI_CORE | I2C_N_VAL; 958 u32 io_mode = QUP_REPACK_EN; 959 960 blk->is_tx_blk_mode = blk->total_tx_len > qup->out_fifo_sz; 961 blk->is_rx_blk_mode = blk->total_rx_len > qup->in_fifo_sz; 962 963 if (blk->is_tx_blk_mode) { 964 io_mode |= QUP_OUTPUT_BLK_MODE; 965 writel(0, qup->base + QUP_MX_WRITE_CNT); 966 writel(blk->total_tx_len, qup->base + QUP_MX_OUTPUT_CNT); 967 } else { 968 writel(0, qup->base + QUP_MX_OUTPUT_CNT); 969 writel(blk->total_tx_len, qup->base + QUP_MX_WRITE_CNT); 970 } 971 972 if (blk->total_rx_len) { 973 if (blk->is_rx_blk_mode) { 974 io_mode |= QUP_INPUT_BLK_MODE; 975 writel(0, qup->base + QUP_MX_READ_CNT); 976 writel(blk->total_rx_len, qup->base + QUP_MX_INPUT_CNT); 977 } else { 978 writel(0, qup->base + QUP_MX_INPUT_CNT); 979 writel(blk->total_rx_len, qup->base + QUP_MX_READ_CNT); 980 } 981 } else { 982 qup_config |= QUP_NO_INPUT; 983 } 984 985 writel(qup_config, qup->base + QUP_CONFIG); 986 writel(io_mode, qup->base + QUP_IO_MODE); 987 } 988 989 static void qup_i2c_clear_blk_v1(struct qup_i2c_block *blk) 990 { 991 blk->tx_fifo_free = 0; 992 blk->fifo_available = 0; 993 blk->rx_bytes_read = false; 994 } 995 996 static int qup_i2c_conf_xfer_v1(struct qup_i2c_dev *qup, bool is_rx) 997 { 998 struct qup_i2c_block *blk = &qup->blk; 999 int ret; 1000 1001 qup_i2c_clear_blk_v1(blk); 1002 qup_i2c_conf_v1(qup); 1003 ret = qup_i2c_change_state(qup, QUP_RUN_STATE); 1004 if (ret) 1005 return ret; 1006 1007 writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL); 1008 1009 ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE); 1010 if (ret) 1011 return ret; 1012 1013 reinit_completion(&qup->xfer); 1014 enable_irq(qup->irq); 1015 if (!blk->is_tx_blk_mode) { 1016 blk->tx_fifo_free = qup->out_fifo_sz; 1017 1018 if (is_rx) 1019 qup_i2c_write_rx_tags_v1(qup); 1020 else 1021 qup_i2c_write_tx_fifo_v1(qup); 1022 } 1023 1024 ret = qup_i2c_change_state(qup, QUP_RUN_STATE); 1025 if (ret) 1026 goto err; 1027 1028 ret = qup_i2c_wait_for_complete(qup, qup->msg); 1029 if (ret) 1030 goto err; 1031 1032 ret = qup_i2c_bus_active(qup, ONE_BYTE); 1033 1034 err: 1035 disable_irq(qup->irq); 1036 return ret; 1037 } 1038 1039 static int qup_i2c_write_one(struct qup_i2c_dev *qup) 1040 { 1041 struct i2c_msg *msg = qup->msg; 1042 struct qup_i2c_block *blk = &qup->blk; 1043 1044 qup->pos = 0; 1045 blk->total_tx_len = msg->len + 1; 1046 blk->total_rx_len = 0; 1047 1048 return qup_i2c_conf_xfer_v1(qup, false); 1049 } 1050 1051 static int qup_i2c_read_one(struct qup_i2c_dev *qup) 1052 { 1053 struct qup_i2c_block *blk = &qup->blk; 1054 1055 qup->pos = 0; 1056 blk->total_tx_len = 2; 1057 blk->total_rx_len = qup->msg->len; 1058 1059 return qup_i2c_conf_xfer_v1(qup, true); 1060 } 1061 1062 static int qup_i2c_xfer(struct i2c_adapter *adap, 1063 struct i2c_msg msgs[], 1064 int num) 1065 { 1066 struct qup_i2c_dev *qup = i2c_get_adapdata(adap); 1067 int ret, idx; 1068 1069 ret = pm_runtime_get_sync(qup->dev); 1070 if (ret < 0) 1071 goto out; 1072 1073 qup->bus_err = 0; 1074 qup->qup_err = 0; 1075 1076 writel(1, qup->base + QUP_SW_RESET); 1077 ret = qup_i2c_poll_state(qup, QUP_RESET_STATE); 1078 if (ret) 1079 goto out; 1080 1081 /* Configure QUP as I2C mini core */ 1082 writel(I2C_MINI_CORE | I2C_N_VAL, qup->base + QUP_CONFIG); 1083 1084 for (idx = 0; idx < num; idx++) { 1085 if (qup_i2c_poll_state_i2c_master(qup)) { 1086 ret = -EIO; 1087 goto out; 1088 } 1089 1090 if (qup_i2c_check_msg_len(&msgs[idx])) { 1091 ret = -EINVAL; 1092 goto out; 1093 } 1094 1095 qup->msg = &msgs[idx]; 1096 if (msgs[idx].flags & I2C_M_RD) 1097 ret = qup_i2c_read_one(qup); 1098 else 1099 ret = qup_i2c_write_one(qup); 1100 1101 if (ret) 1102 break; 1103 1104 ret = qup_i2c_change_state(qup, QUP_RESET_STATE); 1105 if (ret) 1106 break; 1107 } 1108 1109 if (ret == 0) 1110 ret = num; 1111 out: 1112 1113 pm_runtime_mark_last_busy(qup->dev); 1114 pm_runtime_put_autosuspend(qup->dev); 1115 1116 return ret; 1117 } 1118 1119 /* 1120 * Configure registers related with reconfiguration during run and call it 1121 * before each i2c sub transfer. 1122 */ 1123 static void qup_i2c_conf_count_v2(struct qup_i2c_dev *qup) 1124 { 1125 struct qup_i2c_block *blk = &qup->blk; 1126 u32 qup_config = I2C_MINI_CORE | I2C_N_VAL_V2; 1127 1128 if (blk->is_tx_blk_mode) 1129 writel(qup->config_run | blk->total_tx_len, 1130 qup->base + QUP_MX_OUTPUT_CNT); 1131 else 1132 writel(qup->config_run | blk->total_tx_len, 1133 qup->base + QUP_MX_WRITE_CNT); 1134 1135 if (blk->total_rx_len) { 1136 if (blk->is_rx_blk_mode) 1137 writel(qup->config_run | blk->total_rx_len, 1138 qup->base + QUP_MX_INPUT_CNT); 1139 else 1140 writel(qup->config_run | blk->total_rx_len, 1141 qup->base + QUP_MX_READ_CNT); 1142 } else { 1143 qup_config |= QUP_NO_INPUT; 1144 } 1145 1146 writel(qup_config, qup->base + QUP_CONFIG); 1147 } 1148 1149 /* 1150 * Configure registers related with transfer mode (FIFO/Block) 1151 * before starting of i2c transfer. It will be called only once in 1152 * QUP RESET state. 1153 */ 1154 static void qup_i2c_conf_mode_v2(struct qup_i2c_dev *qup) 1155 { 1156 struct qup_i2c_block *blk = &qup->blk; 1157 u32 io_mode = QUP_REPACK_EN; 1158 1159 if (blk->is_tx_blk_mode) { 1160 io_mode |= QUP_OUTPUT_BLK_MODE; 1161 writel(0, qup->base + QUP_MX_WRITE_CNT); 1162 } else { 1163 writel(0, qup->base + QUP_MX_OUTPUT_CNT); 1164 } 1165 1166 if (blk->is_rx_blk_mode) { 1167 io_mode |= QUP_INPUT_BLK_MODE; 1168 writel(0, qup->base + QUP_MX_READ_CNT); 1169 } else { 1170 writel(0, qup->base + QUP_MX_INPUT_CNT); 1171 } 1172 1173 writel(io_mode, qup->base + QUP_IO_MODE); 1174 } 1175 1176 /* Clear required variables before starting of any QUP v2 sub transfer. */ 1177 static void qup_i2c_clear_blk_v2(struct qup_i2c_block *blk) 1178 { 1179 blk->send_last_word = false; 1180 blk->tx_tags_sent = false; 1181 blk->tx_fifo_data = 0; 1182 blk->tx_fifo_data_pos = 0; 1183 blk->tx_fifo_free = 0; 1184 1185 blk->rx_tags_fetched = false; 1186 blk->rx_bytes_read = false; 1187 blk->rx_fifo_data = 0; 1188 blk->rx_fifo_data_pos = 0; 1189 blk->fifo_available = 0; 1190 } 1191 1192 /* Receive data from RX FIFO for read message in QUP v2 i2c transfer. */ 1193 static void qup_i2c_recv_data(struct qup_i2c_dev *qup) 1194 { 1195 struct qup_i2c_block *blk = &qup->blk; 1196 int j; 1197 1198 for (j = blk->rx_fifo_data_pos; 1199 blk->cur_blk_len && blk->fifo_available; 1200 blk->cur_blk_len--, blk->fifo_available--) { 1201 if (j == 0) 1202 blk->rx_fifo_data = readl(qup->base + QUP_IN_FIFO_BASE); 1203 1204 *(blk->cur_data++) = blk->rx_fifo_data; 1205 blk->rx_fifo_data >>= 8; 1206 1207 if (j == 3) 1208 j = 0; 1209 else 1210 j++; 1211 } 1212 1213 blk->rx_fifo_data_pos = j; 1214 } 1215 1216 /* Receive tags for read message in QUP v2 i2c transfer. */ 1217 static void qup_i2c_recv_tags(struct qup_i2c_dev *qup) 1218 { 1219 struct qup_i2c_block *blk = &qup->blk; 1220 1221 blk->rx_fifo_data = readl(qup->base + QUP_IN_FIFO_BASE); 1222 blk->rx_fifo_data >>= blk->rx_tag_len * 8; 1223 blk->rx_fifo_data_pos = blk->rx_tag_len; 1224 blk->fifo_available -= blk->rx_tag_len; 1225 } 1226 1227 /* 1228 * Read the data and tags from RX FIFO. Since in read case, the tags will be 1229 * preceded by received data bytes so 1230 * 1. Check if rx_tags_fetched is false i.e. the start of QUP block so receive 1231 * all tag bytes and discard that. 1232 * 2. Read the data from RX FIFO. When all the data bytes have been read then 1233 * set rx_bytes_read to true. 1234 */ 1235 static void qup_i2c_read_rx_fifo_v2(struct qup_i2c_dev *qup) 1236 { 1237 struct qup_i2c_block *blk = &qup->blk; 1238 1239 if (!blk->rx_tags_fetched) { 1240 qup_i2c_recv_tags(qup); 1241 blk->rx_tags_fetched = true; 1242 } 1243 1244 qup_i2c_recv_data(qup); 1245 if (!blk->cur_blk_len) 1246 blk->rx_bytes_read = true; 1247 } 1248 1249 /* 1250 * Write bytes in TX FIFO for write message in QUP v2 i2c transfer. QUP TX FIFO 1251 * write works on word basis (4 bytes). Append new data byte write for TX FIFO 1252 * in tx_fifo_data and write to TX FIFO when all the 4 bytes are present. 1253 */ 1254 static void 1255 qup_i2c_write_blk_data(struct qup_i2c_dev *qup, u8 **data, unsigned int *len) 1256 { 1257 struct qup_i2c_block *blk = &qup->blk; 1258 unsigned int j; 1259 1260 for (j = blk->tx_fifo_data_pos; *len && blk->tx_fifo_free; 1261 (*len)--, blk->tx_fifo_free--) { 1262 blk->tx_fifo_data |= *(*data)++ << (j * 8); 1263 if (j == 3) { 1264 writel(blk->tx_fifo_data, 1265 qup->base + QUP_OUT_FIFO_BASE); 1266 blk->tx_fifo_data = 0x0; 1267 j = 0; 1268 } else { 1269 j++; 1270 } 1271 } 1272 1273 blk->tx_fifo_data_pos = j; 1274 } 1275 1276 /* Transfer tags for read message in QUP v2 i2c transfer. */ 1277 static void qup_i2c_write_rx_tags_v2(struct qup_i2c_dev *qup) 1278 { 1279 struct qup_i2c_block *blk = &qup->blk; 1280 1281 qup_i2c_write_blk_data(qup, &blk->cur_tx_tags, &blk->tx_tag_len); 1282 if (blk->tx_fifo_data_pos) 1283 writel(blk->tx_fifo_data, qup->base + QUP_OUT_FIFO_BASE); 1284 } 1285 1286 /* 1287 * Write the data and tags in TX FIFO. Since in write case, both tags and data 1288 * need to be written and QUP write tags can have maximum 256 data length, so 1289 * 1290 * 1. Check if tx_tags_sent is false i.e. the start of QUP block so write the 1291 * tags to TX FIFO and set tx_tags_sent to true. 1292 * 2. Check if send_last_word is true. It will be set when last few data bytes 1293 * (less than 4 bytes) are remaining to be written in FIFO because of no FIFO 1294 * space. All this data bytes are available in tx_fifo_data so write this 1295 * in FIFO. 1296 * 3. Write the data to TX FIFO and check for cur_blk_len. If it is non zero 1297 * then more data is pending otherwise following 3 cases can be possible 1298 * a. if tx_fifo_data_pos is zero i.e. all the data bytes in this block 1299 * have been written in TX FIFO so nothing else is required. 1300 * b. tx_fifo_free is non zero i.e tx FIFO is free so copy the remaining data 1301 * from tx_fifo_data to tx FIFO. Since, qup_i2c_write_blk_data do write 1302 * in 4 bytes and FIFO space is in multiple of 4 bytes so tx_fifo_free 1303 * will be always greater than or equal to 4 bytes. 1304 * c. tx_fifo_free is zero. In this case, last few bytes (less than 4 1305 * bytes) are copied to tx_fifo_data but couldn't be sent because of 1306 * FIFO full so make send_last_word true. 1307 */ 1308 static void qup_i2c_write_tx_fifo_v2(struct qup_i2c_dev *qup) 1309 { 1310 struct qup_i2c_block *blk = &qup->blk; 1311 1312 if (!blk->tx_tags_sent) { 1313 qup_i2c_write_blk_data(qup, &blk->cur_tx_tags, 1314 &blk->tx_tag_len); 1315 blk->tx_tags_sent = true; 1316 } 1317 1318 if (blk->send_last_word) 1319 goto send_last_word; 1320 1321 qup_i2c_write_blk_data(qup, &blk->cur_data, &blk->cur_blk_len); 1322 if (!blk->cur_blk_len) { 1323 if (!blk->tx_fifo_data_pos) 1324 return; 1325 1326 if (blk->tx_fifo_free) 1327 goto send_last_word; 1328 1329 blk->send_last_word = true; 1330 } 1331 1332 return; 1333 1334 send_last_word: 1335 writel(blk->tx_fifo_data, qup->base + QUP_OUT_FIFO_BASE); 1336 } 1337 1338 /* 1339 * Main transfer function which read or write i2c data. 1340 * The QUP v2 supports reconfiguration during run in which multiple i2c sub 1341 * transfers can be scheduled. 1342 */ 1343 static int 1344 qup_i2c_conf_xfer_v2(struct qup_i2c_dev *qup, bool is_rx, bool is_first, 1345 bool change_pause_state) 1346 { 1347 struct qup_i2c_block *blk = &qup->blk; 1348 struct i2c_msg *msg = qup->msg; 1349 int ret; 1350 1351 /* 1352 * Check if its SMBus Block read for which the top level read will be 1353 * done into 2 QUP reads. One with message length 1 while other one is 1354 * with actual length. 1355 */ 1356 if (qup_i2c_check_msg_len(msg)) { 1357 if (qup->is_smbus_read) { 1358 /* 1359 * If the message length is already read in 1360 * the first byte of the buffer, account for 1361 * that by setting the offset 1362 */ 1363 blk->cur_data += 1; 1364 is_first = false; 1365 } else { 1366 change_pause_state = false; 1367 } 1368 } 1369 1370 qup->config_run = is_first ? 0 : QUP_I2C_MX_CONFIG_DURING_RUN; 1371 1372 qup_i2c_clear_blk_v2(blk); 1373 qup_i2c_conf_count_v2(qup); 1374 1375 /* If it is first sub transfer, then configure i2c bus clocks */ 1376 if (is_first) { 1377 ret = qup_i2c_change_state(qup, QUP_RUN_STATE); 1378 if (ret) 1379 return ret; 1380 1381 writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL); 1382 1383 ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE); 1384 if (ret) 1385 return ret; 1386 } 1387 1388 reinit_completion(&qup->xfer); 1389 enable_irq(qup->irq); 1390 /* 1391 * In FIFO mode, tx FIFO can be written directly while in block mode the 1392 * it will be written after getting OUT_BLOCK_WRITE_REQ interrupt 1393 */ 1394 if (!blk->is_tx_blk_mode) { 1395 blk->tx_fifo_free = qup->out_fifo_sz; 1396 1397 if (is_rx) 1398 qup_i2c_write_rx_tags_v2(qup); 1399 else 1400 qup_i2c_write_tx_fifo_v2(qup); 1401 } 1402 1403 ret = qup_i2c_change_state(qup, QUP_RUN_STATE); 1404 if (ret) 1405 goto err; 1406 1407 ret = qup_i2c_wait_for_complete(qup, msg); 1408 if (ret) 1409 goto err; 1410 1411 /* Move to pause state for all the transfers, except last one */ 1412 if (change_pause_state) { 1413 ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE); 1414 if (ret) 1415 goto err; 1416 } 1417 1418 err: 1419 disable_irq(qup->irq); 1420 return ret; 1421 } 1422 1423 /* 1424 * Transfer one read/write message in i2c transfer. It splits the message into 1425 * multiple of blk_xfer_limit data length blocks and schedule each 1426 * QUP block individually. 1427 */ 1428 static int qup_i2c_xfer_v2_msg(struct qup_i2c_dev *qup, int msg_id, bool is_rx) 1429 { 1430 int ret = 0; 1431 unsigned int data_len, i; 1432 struct i2c_msg *msg = qup->msg; 1433 struct qup_i2c_block *blk = &qup->blk; 1434 u8 *msg_buf = msg->buf; 1435 1436 qup->blk_xfer_limit = is_rx ? RECV_MAX_DATA_LEN : QUP_READ_LIMIT; 1437 qup_i2c_set_blk_data(qup, msg); 1438 1439 for (i = 0; i < blk->count; i++) { 1440 data_len = qup_i2c_get_data_len(qup); 1441 blk->pos = i; 1442 blk->cur_tx_tags = blk->tags; 1443 blk->cur_blk_len = data_len; 1444 blk->tx_tag_len = 1445 qup_i2c_set_tags(blk->cur_tx_tags, qup, qup->msg); 1446 1447 blk->cur_data = msg_buf; 1448 1449 if (is_rx) { 1450 blk->total_tx_len = blk->tx_tag_len; 1451 blk->rx_tag_len = 2; 1452 blk->total_rx_len = blk->rx_tag_len + data_len; 1453 } else { 1454 blk->total_tx_len = blk->tx_tag_len + data_len; 1455 blk->total_rx_len = 0; 1456 } 1457 1458 ret = qup_i2c_conf_xfer_v2(qup, is_rx, !msg_id && !i, 1459 !qup->is_last || i < blk->count - 1); 1460 if (ret) 1461 return ret; 1462 1463 /* Handle SMBus block read length */ 1464 if (qup_i2c_check_msg_len(msg) && msg->len == 1 && 1465 !qup->is_smbus_read) { 1466 if (msg->buf[0] > I2C_SMBUS_BLOCK_MAX) 1467 return -EPROTO; 1468 1469 msg->len = msg->buf[0]; 1470 qup->is_smbus_read = true; 1471 ret = qup_i2c_xfer_v2_msg(qup, msg_id, true); 1472 qup->is_smbus_read = false; 1473 if (ret) 1474 return ret; 1475 1476 msg->len += 1; 1477 } 1478 1479 msg_buf += data_len; 1480 blk->data_len -= qup->blk_xfer_limit; 1481 } 1482 1483 return ret; 1484 } 1485 1486 /* 1487 * QUP v2 supports 3 modes 1488 * Programmed IO using FIFO mode : Less than FIFO size 1489 * Programmed IO using Block mode : Greater than FIFO size 1490 * DMA using BAM : Appropriate for any transaction size but the address should 1491 * be DMA applicable 1492 * 1493 * This function determines the mode which will be used for this transfer. An 1494 * i2c transfer contains multiple message. Following are the rules to determine 1495 * the mode used. 1496 * 1. Determine complete length, maximum tx and rx length for complete transfer. 1497 * 2. If complete transfer length is greater than fifo size then use the DMA 1498 * mode. 1499 * 3. In FIFO or block mode, tx and rx can operate in different mode so check 1500 * for maximum tx and rx length to determine mode. 1501 */ 1502 static int 1503 qup_i2c_determine_mode_v2(struct qup_i2c_dev *qup, 1504 struct i2c_msg msgs[], int num) 1505 { 1506 int idx; 1507 bool no_dma = false; 1508 unsigned int max_tx_len = 0, max_rx_len = 0, total_len = 0; 1509 1510 /* All i2c_msgs should be transferred using either dma or cpu */ 1511 for (idx = 0; idx < num; idx++) { 1512 if (msgs[idx].flags & I2C_M_RD) 1513 max_rx_len = max_t(unsigned int, max_rx_len, 1514 msgs[idx].len); 1515 else 1516 max_tx_len = max_t(unsigned int, max_tx_len, 1517 msgs[idx].len); 1518 1519 if (is_vmalloc_addr(msgs[idx].buf)) 1520 no_dma = true; 1521 1522 total_len += msgs[idx].len; 1523 } 1524 1525 if (!no_dma && qup->is_dma && 1526 (total_len > qup->out_fifo_sz || total_len > qup->in_fifo_sz)) { 1527 qup->use_dma = true; 1528 } else { 1529 qup->blk.is_tx_blk_mode = max_tx_len > qup->out_fifo_sz - 1530 QUP_MAX_TAGS_LEN; 1531 qup->blk.is_rx_blk_mode = max_rx_len > qup->in_fifo_sz - 1532 READ_RX_TAGS_LEN; 1533 } 1534 1535 return 0; 1536 } 1537 1538 static int qup_i2c_xfer_v2(struct i2c_adapter *adap, 1539 struct i2c_msg msgs[], 1540 int num) 1541 { 1542 struct qup_i2c_dev *qup = i2c_get_adapdata(adap); 1543 int ret, idx = 0; 1544 1545 qup->bus_err = 0; 1546 qup->qup_err = 0; 1547 1548 ret = pm_runtime_get_sync(qup->dev); 1549 if (ret < 0) 1550 goto out; 1551 1552 ret = qup_i2c_determine_mode_v2(qup, msgs, num); 1553 if (ret) 1554 goto out; 1555 1556 writel(1, qup->base + QUP_SW_RESET); 1557 ret = qup_i2c_poll_state(qup, QUP_RESET_STATE); 1558 if (ret) 1559 goto out; 1560 1561 /* Configure QUP as I2C mini core */ 1562 writel(I2C_MINI_CORE | I2C_N_VAL_V2, qup->base + QUP_CONFIG); 1563 writel(QUP_V2_TAGS_EN, qup->base + QUP_I2C_MASTER_GEN); 1564 1565 if (qup_i2c_poll_state_i2c_master(qup)) { 1566 ret = -EIO; 1567 goto out; 1568 } 1569 1570 if (qup->use_dma) { 1571 reinit_completion(&qup->xfer); 1572 ret = qup_i2c_bam_xfer(adap, &msgs[0], num); 1573 qup->use_dma = false; 1574 } else { 1575 qup_i2c_conf_mode_v2(qup); 1576 1577 for (idx = 0; idx < num; idx++) { 1578 qup->msg = &msgs[idx]; 1579 qup->is_last = idx == (num - 1); 1580 1581 ret = qup_i2c_xfer_v2_msg(qup, idx, 1582 !!(msgs[idx].flags & I2C_M_RD)); 1583 if (ret) 1584 break; 1585 } 1586 qup->msg = NULL; 1587 } 1588 1589 if (!ret) 1590 ret = qup_i2c_bus_active(qup, ONE_BYTE); 1591 1592 if (!ret) 1593 qup_i2c_change_state(qup, QUP_RESET_STATE); 1594 1595 if (ret == 0) 1596 ret = num; 1597 out: 1598 pm_runtime_mark_last_busy(qup->dev); 1599 pm_runtime_put_autosuspend(qup->dev); 1600 1601 return ret; 1602 } 1603 1604 static u32 qup_i2c_func(struct i2c_adapter *adap) 1605 { 1606 return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL_ALL & ~I2C_FUNC_SMBUS_QUICK); 1607 } 1608 1609 static const struct i2c_algorithm qup_i2c_algo = { 1610 .master_xfer = qup_i2c_xfer, 1611 .functionality = qup_i2c_func, 1612 }; 1613 1614 static const struct i2c_algorithm qup_i2c_algo_v2 = { 1615 .master_xfer = qup_i2c_xfer_v2, 1616 .functionality = qup_i2c_func, 1617 }; 1618 1619 /* 1620 * The QUP block will issue a NACK and STOP on the bus when reaching 1621 * the end of the read, the length of the read is specified as one byte 1622 * which limits the possible read to 256 (QUP_READ_LIMIT) bytes. 1623 */ 1624 static const struct i2c_adapter_quirks qup_i2c_quirks = { 1625 .flags = I2C_AQ_NO_ZERO_LEN, 1626 .max_read_len = QUP_READ_LIMIT, 1627 }; 1628 1629 static const struct i2c_adapter_quirks qup_i2c_quirks_v2 = { 1630 .flags = I2C_AQ_NO_ZERO_LEN, 1631 }; 1632 1633 static void qup_i2c_enable_clocks(struct qup_i2c_dev *qup) 1634 { 1635 clk_prepare_enable(qup->clk); 1636 clk_prepare_enable(qup->pclk); 1637 } 1638 1639 static void qup_i2c_disable_clocks(struct qup_i2c_dev *qup) 1640 { 1641 u32 config; 1642 1643 qup_i2c_change_state(qup, QUP_RESET_STATE); 1644 clk_disable_unprepare(qup->clk); 1645 config = readl(qup->base + QUP_CONFIG); 1646 config |= QUP_CLOCK_AUTO_GATE; 1647 writel(config, qup->base + QUP_CONFIG); 1648 clk_disable_unprepare(qup->pclk); 1649 } 1650 1651 static const struct acpi_device_id qup_i2c_acpi_match[] = { 1652 { "QCOM8010"}, 1653 { }, 1654 }; 1655 MODULE_DEVICE_TABLE(acpi, qup_i2c_acpi_match); 1656 1657 static int qup_i2c_probe(struct platform_device *pdev) 1658 { 1659 static const int blk_sizes[] = {4, 16, 32}; 1660 struct qup_i2c_dev *qup; 1661 unsigned long one_bit_t; 1662 u32 io_mode, hw_ver, size; 1663 int ret, fs_div, hs_div; 1664 u32 src_clk_freq = DEFAULT_SRC_CLK; 1665 u32 clk_freq = DEFAULT_CLK_FREQ; 1666 int blocks; 1667 bool is_qup_v1; 1668 1669 qup = devm_kzalloc(&pdev->dev, sizeof(*qup), GFP_KERNEL); 1670 if (!qup) 1671 return -ENOMEM; 1672 1673 qup->dev = &pdev->dev; 1674 init_completion(&qup->xfer); 1675 platform_set_drvdata(pdev, qup); 1676 1677 if (scl_freq) { 1678 dev_notice(qup->dev, "Using override frequency of %u\n", scl_freq); 1679 clk_freq = scl_freq; 1680 } else { 1681 ret = device_property_read_u32(qup->dev, "clock-frequency", &clk_freq); 1682 if (ret) { 1683 dev_notice(qup->dev, "using default clock-frequency %d", 1684 DEFAULT_CLK_FREQ); 1685 } 1686 } 1687 1688 if (of_device_is_compatible(pdev->dev.of_node, "qcom,i2c-qup-v1.1.1")) { 1689 qup->adap.algo = &qup_i2c_algo; 1690 qup->adap.quirks = &qup_i2c_quirks; 1691 is_qup_v1 = true; 1692 } else { 1693 qup->adap.algo = &qup_i2c_algo_v2; 1694 qup->adap.quirks = &qup_i2c_quirks_v2; 1695 is_qup_v1 = false; 1696 if (acpi_match_device(qup_i2c_acpi_match, qup->dev)) 1697 goto nodma; 1698 else 1699 ret = qup_i2c_req_dma(qup); 1700 1701 if (ret == -EPROBE_DEFER) 1702 goto fail_dma; 1703 else if (ret != 0) 1704 goto nodma; 1705 1706 qup->max_xfer_sg_len = (MX_BLOCKS << 1); 1707 blocks = (MX_DMA_BLOCKS << 1) + 1; 1708 qup->btx.sg = devm_kcalloc(&pdev->dev, 1709 blocks, sizeof(*qup->btx.sg), 1710 GFP_KERNEL); 1711 if (!qup->btx.sg) { 1712 ret = -ENOMEM; 1713 goto fail_dma; 1714 } 1715 sg_init_table(qup->btx.sg, blocks); 1716 1717 qup->brx.sg = devm_kcalloc(&pdev->dev, 1718 blocks, sizeof(*qup->brx.sg), 1719 GFP_KERNEL); 1720 if (!qup->brx.sg) { 1721 ret = -ENOMEM; 1722 goto fail_dma; 1723 } 1724 sg_init_table(qup->brx.sg, blocks); 1725 1726 /* 2 tag bytes for each block + 5 for start, stop tags */ 1727 size = blocks * 2 + 5; 1728 1729 qup->start_tag.start = devm_kzalloc(&pdev->dev, 1730 size, GFP_KERNEL); 1731 if (!qup->start_tag.start) { 1732 ret = -ENOMEM; 1733 goto fail_dma; 1734 } 1735 1736 qup->brx.tag.start = devm_kzalloc(&pdev->dev, 2, GFP_KERNEL); 1737 if (!qup->brx.tag.start) { 1738 ret = -ENOMEM; 1739 goto fail_dma; 1740 } 1741 1742 qup->btx.tag.start = devm_kzalloc(&pdev->dev, 2, GFP_KERNEL); 1743 if (!qup->btx.tag.start) { 1744 ret = -ENOMEM; 1745 goto fail_dma; 1746 } 1747 qup->is_dma = true; 1748 } 1749 1750 nodma: 1751 /* We support frequencies up to FAST Mode Plus (1MHz) */ 1752 if (!clk_freq || clk_freq > I2C_MAX_FAST_MODE_PLUS_FREQ) { 1753 dev_err(qup->dev, "clock frequency not supported %d\n", 1754 clk_freq); 1755 ret = -EINVAL; 1756 goto fail_dma; 1757 } 1758 1759 qup->base = devm_platform_ioremap_resource(pdev, 0); 1760 if (IS_ERR(qup->base)) { 1761 ret = PTR_ERR(qup->base); 1762 goto fail_dma; 1763 } 1764 1765 qup->irq = platform_get_irq(pdev, 0); 1766 if (qup->irq < 0) { 1767 ret = qup->irq; 1768 goto fail_dma; 1769 } 1770 1771 if (has_acpi_companion(qup->dev)) { 1772 ret = device_property_read_u32(qup->dev, 1773 "src-clock-hz", &src_clk_freq); 1774 if (ret) { 1775 dev_notice(qup->dev, "using default src-clock-hz %d", 1776 DEFAULT_SRC_CLK); 1777 } 1778 ACPI_COMPANION_SET(&qup->adap.dev, ACPI_COMPANION(qup->dev)); 1779 } else { 1780 qup->clk = devm_clk_get(qup->dev, "core"); 1781 if (IS_ERR(qup->clk)) { 1782 dev_err(qup->dev, "Could not get core clock\n"); 1783 ret = PTR_ERR(qup->clk); 1784 goto fail_dma; 1785 } 1786 1787 qup->pclk = devm_clk_get(qup->dev, "iface"); 1788 if (IS_ERR(qup->pclk)) { 1789 dev_err(qup->dev, "Could not get iface clock\n"); 1790 ret = PTR_ERR(qup->pclk); 1791 goto fail_dma; 1792 } 1793 qup_i2c_enable_clocks(qup); 1794 src_clk_freq = clk_get_rate(qup->clk); 1795 } 1796 1797 /* 1798 * Bootloaders might leave a pending interrupt on certain QUP's, 1799 * so we reset the core before registering for interrupts. 1800 */ 1801 writel(1, qup->base + QUP_SW_RESET); 1802 ret = qup_i2c_poll_state_valid(qup); 1803 if (ret) 1804 goto fail; 1805 1806 ret = devm_request_irq(qup->dev, qup->irq, qup_i2c_interrupt, 1807 IRQF_TRIGGER_HIGH | IRQF_NO_AUTOEN, 1808 "i2c_qup", qup); 1809 if (ret) { 1810 dev_err(qup->dev, "Request %d IRQ failed\n", qup->irq); 1811 goto fail; 1812 } 1813 1814 hw_ver = readl(qup->base + QUP_HW_VERSION); 1815 dev_dbg(qup->dev, "Revision %x\n", hw_ver); 1816 1817 io_mode = readl(qup->base + QUP_IO_MODE); 1818 1819 /* 1820 * The block/fifo size w.r.t. 'actual data' is 1/2 due to 'tag' 1821 * associated with each byte written/received 1822 */ 1823 size = QUP_OUTPUT_BLOCK_SIZE(io_mode); 1824 if (size >= ARRAY_SIZE(blk_sizes)) { 1825 ret = -EIO; 1826 goto fail; 1827 } 1828 qup->out_blk_sz = blk_sizes[size]; 1829 1830 size = QUP_INPUT_BLOCK_SIZE(io_mode); 1831 if (size >= ARRAY_SIZE(blk_sizes)) { 1832 ret = -EIO; 1833 goto fail; 1834 } 1835 qup->in_blk_sz = blk_sizes[size]; 1836 1837 if (is_qup_v1) { 1838 /* 1839 * in QUP v1, QUP_CONFIG uses N as 15 i.e 16 bits constitutes a 1840 * single transfer but the block size is in bytes so divide the 1841 * in_blk_sz and out_blk_sz by 2 1842 */ 1843 qup->in_blk_sz /= 2; 1844 qup->out_blk_sz /= 2; 1845 qup->write_tx_fifo = qup_i2c_write_tx_fifo_v1; 1846 qup->read_rx_fifo = qup_i2c_read_rx_fifo_v1; 1847 qup->write_rx_tags = qup_i2c_write_rx_tags_v1; 1848 } else { 1849 qup->write_tx_fifo = qup_i2c_write_tx_fifo_v2; 1850 qup->read_rx_fifo = qup_i2c_read_rx_fifo_v2; 1851 qup->write_rx_tags = qup_i2c_write_rx_tags_v2; 1852 } 1853 1854 size = QUP_OUTPUT_FIFO_SIZE(io_mode); 1855 qup->out_fifo_sz = qup->out_blk_sz * (2 << size); 1856 1857 size = QUP_INPUT_FIFO_SIZE(io_mode); 1858 qup->in_fifo_sz = qup->in_blk_sz * (2 << size); 1859 1860 hs_div = 3; 1861 if (clk_freq <= I2C_MAX_STANDARD_MODE_FREQ) { 1862 fs_div = ((src_clk_freq / clk_freq) / 2) - 3; 1863 qup->clk_ctl = (hs_div << 8) | (fs_div & 0xff); 1864 } else { 1865 /* 33%/66% duty cycle */ 1866 fs_div = ((src_clk_freq / clk_freq) - 6) * 2 / 3; 1867 qup->clk_ctl = ((fs_div / 2) << 16) | (hs_div << 8) | (fs_div & 0xff); 1868 } 1869 1870 /* 1871 * Time it takes for a byte to be clocked out on the bus. 1872 * Each byte takes 9 clock cycles (8 bits + 1 ack). 1873 */ 1874 one_bit_t = (USEC_PER_SEC / clk_freq) + 1; 1875 qup->one_byte_t = one_bit_t * 9; 1876 qup->xfer_timeout = TOUT_MIN * HZ + 1877 usecs_to_jiffies(MX_DMA_TX_RX_LEN * qup->one_byte_t); 1878 1879 dev_dbg(qup->dev, "IN:block:%d, fifo:%d, OUT:block:%d, fifo:%d\n", 1880 qup->in_blk_sz, qup->in_fifo_sz, 1881 qup->out_blk_sz, qup->out_fifo_sz); 1882 1883 i2c_set_adapdata(&qup->adap, qup); 1884 qup->adap.dev.parent = qup->dev; 1885 qup->adap.dev.of_node = pdev->dev.of_node; 1886 qup->is_last = true; 1887 1888 strscpy(qup->adap.name, "QUP I2C adapter", sizeof(qup->adap.name)); 1889 1890 pm_runtime_set_autosuspend_delay(qup->dev, MSEC_PER_SEC); 1891 pm_runtime_use_autosuspend(qup->dev); 1892 pm_runtime_set_active(qup->dev); 1893 pm_runtime_enable(qup->dev); 1894 1895 ret = i2c_add_adapter(&qup->adap); 1896 if (ret) 1897 goto fail_runtime; 1898 1899 return 0; 1900 1901 fail_runtime: 1902 pm_runtime_disable(qup->dev); 1903 pm_runtime_set_suspended(qup->dev); 1904 fail: 1905 qup_i2c_disable_clocks(qup); 1906 fail_dma: 1907 if (qup->btx.dma) 1908 dma_release_channel(qup->btx.dma); 1909 if (qup->brx.dma) 1910 dma_release_channel(qup->brx.dma); 1911 return ret; 1912 } 1913 1914 static void qup_i2c_remove(struct platform_device *pdev) 1915 { 1916 struct qup_i2c_dev *qup = platform_get_drvdata(pdev); 1917 1918 if (qup->is_dma) { 1919 dma_release_channel(qup->btx.dma); 1920 dma_release_channel(qup->brx.dma); 1921 } 1922 1923 disable_irq(qup->irq); 1924 qup_i2c_disable_clocks(qup); 1925 i2c_del_adapter(&qup->adap); 1926 pm_runtime_disable(qup->dev); 1927 pm_runtime_set_suspended(qup->dev); 1928 } 1929 1930 static int qup_i2c_pm_suspend_runtime(struct device *device) 1931 { 1932 struct qup_i2c_dev *qup = dev_get_drvdata(device); 1933 1934 dev_dbg(device, "pm_runtime: suspending...\n"); 1935 qup_i2c_disable_clocks(qup); 1936 return 0; 1937 } 1938 1939 static int qup_i2c_pm_resume_runtime(struct device *device) 1940 { 1941 struct qup_i2c_dev *qup = dev_get_drvdata(device); 1942 1943 dev_dbg(device, "pm_runtime: resuming...\n"); 1944 qup_i2c_enable_clocks(qup); 1945 return 0; 1946 } 1947 1948 static int qup_i2c_suspend(struct device *device) 1949 { 1950 if (!pm_runtime_suspended(device)) 1951 return qup_i2c_pm_suspend_runtime(device); 1952 return 0; 1953 } 1954 1955 static int qup_i2c_resume(struct device *device) 1956 { 1957 qup_i2c_pm_resume_runtime(device); 1958 pm_runtime_mark_last_busy(device); 1959 pm_request_autosuspend(device); 1960 return 0; 1961 } 1962 1963 static const struct dev_pm_ops qup_i2c_qup_pm_ops = { 1964 SYSTEM_SLEEP_PM_OPS(qup_i2c_suspend, qup_i2c_resume) 1965 RUNTIME_PM_OPS(qup_i2c_pm_suspend_runtime, 1966 qup_i2c_pm_resume_runtime, NULL) 1967 }; 1968 1969 static const struct of_device_id qup_i2c_dt_match[] = { 1970 { .compatible = "qcom,i2c-qup-v1.1.1" }, 1971 { .compatible = "qcom,i2c-qup-v2.1.1" }, 1972 { .compatible = "qcom,i2c-qup-v2.2.1" }, 1973 {} 1974 }; 1975 MODULE_DEVICE_TABLE(of, qup_i2c_dt_match); 1976 1977 static struct platform_driver qup_i2c_driver = { 1978 .probe = qup_i2c_probe, 1979 .remove_new = qup_i2c_remove, 1980 .driver = { 1981 .name = "i2c_qup", 1982 .pm = pm_ptr(&qup_i2c_qup_pm_ops), 1983 .of_match_table = qup_i2c_dt_match, 1984 .acpi_match_table = ACPI_PTR(qup_i2c_acpi_match), 1985 }, 1986 }; 1987 1988 module_platform_driver(qup_i2c_driver); 1989 1990 MODULE_LICENSE("GPL v2"); 1991 MODULE_ALIAS("platform:i2c_qup"); 1992