1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (c) 2017-2018, The Linux foundation. All rights reserved. 3 4 #include <linux/clk.h> 5 #include <linux/interconnect.h> 6 #include <linux/interrupt.h> 7 #include <linux/io.h> 8 #include <linux/module.h> 9 #include <linux/of.h> 10 #include <linux/of_platform.h> 11 #include <linux/pm_runtime.h> 12 #include <linux/pm_opp.h> 13 #include <linux/spi/spi.h> 14 #include <linux/spi/spi-mem.h> 15 16 17 #define QSPI_NUM_CS 2 18 #define QSPI_BYTES_PER_WORD 4 19 20 #define MSTR_CONFIG 0x0000 21 #define FULL_CYCLE_MODE BIT(3) 22 #define FB_CLK_EN BIT(4) 23 #define PIN_HOLDN BIT(6) 24 #define PIN_WPN BIT(7) 25 #define DMA_ENABLE BIT(8) 26 #define BIG_ENDIAN_MODE BIT(9) 27 #define SPI_MODE_MSK 0xc00 28 #define SPI_MODE_SHFT 10 29 #define CHIP_SELECT_NUM BIT(12) 30 #define SBL_EN BIT(13) 31 #define LPA_BASE_MSK 0x3c000 32 #define LPA_BASE_SHFT 14 33 #define TX_DATA_DELAY_MSK 0xc0000 34 #define TX_DATA_DELAY_SHFT 18 35 #define TX_CLK_DELAY_MSK 0x300000 36 #define TX_CLK_DELAY_SHFT 20 37 #define TX_CS_N_DELAY_MSK 0xc00000 38 #define TX_CS_N_DELAY_SHFT 22 39 #define TX_DATA_OE_DELAY_MSK 0x3000000 40 #define TX_DATA_OE_DELAY_SHFT 24 41 42 #define AHB_MASTER_CFG 0x0004 43 #define HMEM_TYPE_START_MID_TRANS_MSK 0x7 44 #define HMEM_TYPE_START_MID_TRANS_SHFT 0 45 #define HMEM_TYPE_LAST_TRANS_MSK 0x38 46 #define HMEM_TYPE_LAST_TRANS_SHFT 3 47 #define USE_HMEMTYPE_LAST_ON_DESC_OR_CHAIN_MSK 0xc0 48 #define USE_HMEMTYPE_LAST_ON_DESC_OR_CHAIN_SHFT 6 49 #define HMEMTYPE_READ_TRANS_MSK 0x700 50 #define HMEMTYPE_READ_TRANS_SHFT 8 51 #define HSHARED BIT(11) 52 #define HINNERSHARED BIT(12) 53 54 #define MSTR_INT_EN 0x000C 55 #define MSTR_INT_STATUS 0x0010 56 #define RESP_FIFO_UNDERRUN BIT(0) 57 #define RESP_FIFO_NOT_EMPTY BIT(1) 58 #define RESP_FIFO_RDY BIT(2) 59 #define HRESP_FROM_NOC_ERR BIT(3) 60 #define WR_FIFO_EMPTY BIT(9) 61 #define WR_FIFO_FULL BIT(10) 62 #define WR_FIFO_OVERRUN BIT(11) 63 #define TRANSACTION_DONE BIT(16) 64 #define QSPI_ERR_IRQS (RESP_FIFO_UNDERRUN | HRESP_FROM_NOC_ERR | \ 65 WR_FIFO_OVERRUN) 66 #define QSPI_ALL_IRQS (QSPI_ERR_IRQS | RESP_FIFO_RDY | \ 67 WR_FIFO_EMPTY | WR_FIFO_FULL | \ 68 TRANSACTION_DONE) 69 70 #define PIO_XFER_CTRL 0x0014 71 #define REQUEST_COUNT_MSK 0xffff 72 73 #define PIO_XFER_CFG 0x0018 74 #define TRANSFER_DIRECTION BIT(0) 75 #define MULTI_IO_MODE_MSK 0xe 76 #define MULTI_IO_MODE_SHFT 1 77 #define TRANSFER_FRAGMENT BIT(8) 78 #define SDR_1BIT 1 79 #define SDR_2BIT 2 80 #define SDR_4BIT 3 81 #define DDR_1BIT 5 82 #define DDR_2BIT 6 83 #define DDR_4BIT 7 84 #define DMA_DESC_SINGLE_SPI 1 85 #define DMA_DESC_DUAL_SPI 2 86 #define DMA_DESC_QUAD_SPI 3 87 88 #define PIO_XFER_STATUS 0x001c 89 #define WR_FIFO_BYTES_MSK 0xffff0000 90 #define WR_FIFO_BYTES_SHFT 16 91 92 #define PIO_DATAOUT_1B 0x0020 93 #define PIO_DATAOUT_4B 0x0024 94 95 #define RD_FIFO_CFG 0x0028 96 #define CONTINUOUS_MODE BIT(0) 97 98 #define RD_FIFO_STATUS 0x002c 99 #define FIFO_EMPTY BIT(11) 100 #define WR_CNTS_MSK 0x7f0 101 #define WR_CNTS_SHFT 4 102 #define RDY_64BYTE BIT(3) 103 #define RDY_32BYTE BIT(2) 104 #define RDY_16BYTE BIT(1) 105 #define FIFO_RDY BIT(0) 106 107 #define RD_FIFO_RESET 0x0030 108 #define RESET_FIFO BIT(0) 109 110 #define CUR_MEM_ADDR 0x0048 111 #define HW_VERSION 0x004c 112 #define RD_FIFO 0x0050 113 #define SAMPLING_CLK_CFG 0x0090 114 #define SAMPLING_CLK_STATUS 0x0094 115 116 117 enum qspi_dir { 118 QSPI_READ, 119 QSPI_WRITE, 120 }; 121 122 struct qspi_xfer { 123 union { 124 const void *tx_buf; 125 void *rx_buf; 126 }; 127 unsigned int rem_bytes; 128 unsigned int buswidth; 129 enum qspi_dir dir; 130 bool is_last; 131 }; 132 133 enum qspi_clocks { 134 QSPI_CLK_CORE, 135 QSPI_CLK_IFACE, 136 QSPI_NUM_CLKS 137 }; 138 139 struct qcom_qspi { 140 void __iomem *base; 141 struct device *dev; 142 struct clk_bulk_data *clks; 143 struct qspi_xfer xfer; 144 struct icc_path *icc_path_cpu_to_qspi; 145 struct opp_table *opp_table; 146 unsigned long last_speed; 147 /* Lock to protect data accessed by IRQs */ 148 spinlock_t lock; 149 }; 150 151 static u32 qspi_buswidth_to_iomode(struct qcom_qspi *ctrl, 152 unsigned int buswidth) 153 { 154 switch (buswidth) { 155 case 1: 156 return SDR_1BIT << MULTI_IO_MODE_SHFT; 157 case 2: 158 return SDR_2BIT << MULTI_IO_MODE_SHFT; 159 case 4: 160 return SDR_4BIT << MULTI_IO_MODE_SHFT; 161 default: 162 dev_warn_once(ctrl->dev, 163 "Unexpected bus width: %u\n", buswidth); 164 return SDR_1BIT << MULTI_IO_MODE_SHFT; 165 } 166 } 167 168 static void qcom_qspi_pio_xfer_cfg(struct qcom_qspi *ctrl) 169 { 170 u32 pio_xfer_cfg; 171 const struct qspi_xfer *xfer; 172 173 xfer = &ctrl->xfer; 174 pio_xfer_cfg = readl(ctrl->base + PIO_XFER_CFG); 175 pio_xfer_cfg &= ~TRANSFER_DIRECTION; 176 pio_xfer_cfg |= xfer->dir; 177 if (xfer->is_last) 178 pio_xfer_cfg &= ~TRANSFER_FRAGMENT; 179 else 180 pio_xfer_cfg |= TRANSFER_FRAGMENT; 181 pio_xfer_cfg &= ~MULTI_IO_MODE_MSK; 182 pio_xfer_cfg |= qspi_buswidth_to_iomode(ctrl, xfer->buswidth); 183 184 writel(pio_xfer_cfg, ctrl->base + PIO_XFER_CFG); 185 } 186 187 static void qcom_qspi_pio_xfer_ctrl(struct qcom_qspi *ctrl) 188 { 189 u32 pio_xfer_ctrl; 190 191 pio_xfer_ctrl = readl(ctrl->base + PIO_XFER_CTRL); 192 pio_xfer_ctrl &= ~REQUEST_COUNT_MSK; 193 pio_xfer_ctrl |= ctrl->xfer.rem_bytes; 194 writel(pio_xfer_ctrl, ctrl->base + PIO_XFER_CTRL); 195 } 196 197 static void qcom_qspi_pio_xfer(struct qcom_qspi *ctrl) 198 { 199 u32 ints; 200 201 qcom_qspi_pio_xfer_cfg(ctrl); 202 203 /* Ack any previous interrupts that might be hanging around */ 204 writel(QSPI_ALL_IRQS, ctrl->base + MSTR_INT_STATUS); 205 206 /* Setup new interrupts */ 207 if (ctrl->xfer.dir == QSPI_WRITE) 208 ints = QSPI_ERR_IRQS | WR_FIFO_EMPTY; 209 else 210 ints = QSPI_ERR_IRQS | RESP_FIFO_RDY; 211 writel(ints, ctrl->base + MSTR_INT_EN); 212 213 /* Kick off the transfer */ 214 qcom_qspi_pio_xfer_ctrl(ctrl); 215 } 216 217 static void qcom_qspi_handle_err(struct spi_master *master, 218 struct spi_message *msg) 219 { 220 struct qcom_qspi *ctrl = spi_master_get_devdata(master); 221 unsigned long flags; 222 223 spin_lock_irqsave(&ctrl->lock, flags); 224 writel(0, ctrl->base + MSTR_INT_EN); 225 ctrl->xfer.rem_bytes = 0; 226 spin_unlock_irqrestore(&ctrl->lock, flags); 227 } 228 229 static int qcom_qspi_set_speed(struct qcom_qspi *ctrl, unsigned long speed_hz) 230 { 231 int ret; 232 unsigned int avg_bw_cpu; 233 234 if (speed_hz == ctrl->last_speed) 235 return 0; 236 237 /* In regular operation (SBL_EN=1) core must be 4x transfer clock */ 238 ret = dev_pm_opp_set_rate(ctrl->dev, speed_hz * 4); 239 if (ret) { 240 dev_err(ctrl->dev, "Failed to set core clk %d\n", ret); 241 return ret; 242 } 243 244 /* 245 * Set BW quota for CPU as driver supports FIFO mode only. 246 * We don't have explicit peak requirement so keep it equal to avg_bw. 247 */ 248 avg_bw_cpu = Bps_to_icc(speed_hz); 249 ret = icc_set_bw(ctrl->icc_path_cpu_to_qspi, avg_bw_cpu, avg_bw_cpu); 250 if (ret) { 251 dev_err(ctrl->dev, "%s: ICC BW voting failed for cpu: %d\n", 252 __func__, ret); 253 return ret; 254 } 255 256 ctrl->last_speed = speed_hz; 257 258 return 0; 259 } 260 261 static int qcom_qspi_transfer_one(struct spi_master *master, 262 struct spi_device *slv, 263 struct spi_transfer *xfer) 264 { 265 struct qcom_qspi *ctrl = spi_master_get_devdata(master); 266 int ret; 267 unsigned long speed_hz; 268 unsigned long flags; 269 270 speed_hz = slv->max_speed_hz; 271 if (xfer->speed_hz) 272 speed_hz = xfer->speed_hz; 273 274 ret = qcom_qspi_set_speed(ctrl, speed_hz); 275 if (ret) 276 return ret; 277 278 spin_lock_irqsave(&ctrl->lock, flags); 279 280 /* We are half duplex, so either rx or tx will be set */ 281 if (xfer->rx_buf) { 282 ctrl->xfer.dir = QSPI_READ; 283 ctrl->xfer.buswidth = xfer->rx_nbits; 284 ctrl->xfer.rx_buf = xfer->rx_buf; 285 } else { 286 ctrl->xfer.dir = QSPI_WRITE; 287 ctrl->xfer.buswidth = xfer->tx_nbits; 288 ctrl->xfer.tx_buf = xfer->tx_buf; 289 } 290 ctrl->xfer.is_last = list_is_last(&xfer->transfer_list, 291 &master->cur_msg->transfers); 292 ctrl->xfer.rem_bytes = xfer->len; 293 qcom_qspi_pio_xfer(ctrl); 294 295 spin_unlock_irqrestore(&ctrl->lock, flags); 296 297 /* We'll call spi_finalize_current_transfer() when done */ 298 return 1; 299 } 300 301 static int qcom_qspi_prepare_message(struct spi_master *master, 302 struct spi_message *message) 303 { 304 u32 mstr_cfg; 305 struct qcom_qspi *ctrl; 306 int tx_data_oe_delay = 1; 307 int tx_data_delay = 1; 308 unsigned long flags; 309 310 ctrl = spi_master_get_devdata(master); 311 spin_lock_irqsave(&ctrl->lock, flags); 312 313 mstr_cfg = readl(ctrl->base + MSTR_CONFIG); 314 mstr_cfg &= ~CHIP_SELECT_NUM; 315 if (message->spi->chip_select) 316 mstr_cfg |= CHIP_SELECT_NUM; 317 318 mstr_cfg |= FB_CLK_EN | PIN_WPN | PIN_HOLDN | SBL_EN | FULL_CYCLE_MODE; 319 mstr_cfg &= ~(SPI_MODE_MSK | TX_DATA_OE_DELAY_MSK | TX_DATA_DELAY_MSK); 320 mstr_cfg |= message->spi->mode << SPI_MODE_SHFT; 321 mstr_cfg |= tx_data_oe_delay << TX_DATA_OE_DELAY_SHFT; 322 mstr_cfg |= tx_data_delay << TX_DATA_DELAY_SHFT; 323 mstr_cfg &= ~DMA_ENABLE; 324 325 writel(mstr_cfg, ctrl->base + MSTR_CONFIG); 326 spin_unlock_irqrestore(&ctrl->lock, flags); 327 328 return 0; 329 } 330 331 static irqreturn_t pio_read(struct qcom_qspi *ctrl) 332 { 333 u32 rd_fifo_status; 334 u32 rd_fifo; 335 unsigned int wr_cnts; 336 unsigned int bytes_to_read; 337 unsigned int words_to_read; 338 u32 *word_buf; 339 u8 *byte_buf; 340 int i; 341 342 rd_fifo_status = readl(ctrl->base + RD_FIFO_STATUS); 343 344 if (!(rd_fifo_status & FIFO_RDY)) { 345 dev_dbg(ctrl->dev, "Spurious IRQ %#x\n", rd_fifo_status); 346 return IRQ_NONE; 347 } 348 349 wr_cnts = (rd_fifo_status & WR_CNTS_MSK) >> WR_CNTS_SHFT; 350 wr_cnts = min(wr_cnts, ctrl->xfer.rem_bytes); 351 352 words_to_read = wr_cnts / QSPI_BYTES_PER_WORD; 353 bytes_to_read = wr_cnts % QSPI_BYTES_PER_WORD; 354 355 if (words_to_read) { 356 word_buf = ctrl->xfer.rx_buf; 357 ctrl->xfer.rem_bytes -= words_to_read * QSPI_BYTES_PER_WORD; 358 ioread32_rep(ctrl->base + RD_FIFO, word_buf, words_to_read); 359 ctrl->xfer.rx_buf = word_buf + words_to_read; 360 } 361 362 if (bytes_to_read) { 363 byte_buf = ctrl->xfer.rx_buf; 364 rd_fifo = readl(ctrl->base + RD_FIFO); 365 ctrl->xfer.rem_bytes -= bytes_to_read; 366 for (i = 0; i < bytes_to_read; i++) 367 *byte_buf++ = rd_fifo >> (i * BITS_PER_BYTE); 368 ctrl->xfer.rx_buf = byte_buf; 369 } 370 371 return IRQ_HANDLED; 372 } 373 374 static irqreturn_t pio_write(struct qcom_qspi *ctrl) 375 { 376 const void *xfer_buf = ctrl->xfer.tx_buf; 377 const int *word_buf; 378 const char *byte_buf; 379 unsigned int wr_fifo_bytes; 380 unsigned int wr_fifo_words; 381 unsigned int wr_size; 382 unsigned int rem_words; 383 384 wr_fifo_bytes = readl(ctrl->base + PIO_XFER_STATUS); 385 wr_fifo_bytes >>= WR_FIFO_BYTES_SHFT; 386 387 if (ctrl->xfer.rem_bytes < QSPI_BYTES_PER_WORD) { 388 /* Process the last 1-3 bytes */ 389 wr_size = min(wr_fifo_bytes, ctrl->xfer.rem_bytes); 390 ctrl->xfer.rem_bytes -= wr_size; 391 392 byte_buf = xfer_buf; 393 while (wr_size--) 394 writel(*byte_buf++, 395 ctrl->base + PIO_DATAOUT_1B); 396 ctrl->xfer.tx_buf = byte_buf; 397 } else { 398 /* 399 * Process all the whole words; to keep things simple we'll 400 * just wait for the next interrupt to handle the last 1-3 401 * bytes if we don't have an even number of words. 402 */ 403 rem_words = ctrl->xfer.rem_bytes / QSPI_BYTES_PER_WORD; 404 wr_fifo_words = wr_fifo_bytes / QSPI_BYTES_PER_WORD; 405 406 wr_size = min(rem_words, wr_fifo_words); 407 ctrl->xfer.rem_bytes -= wr_size * QSPI_BYTES_PER_WORD; 408 409 word_buf = xfer_buf; 410 iowrite32_rep(ctrl->base + PIO_DATAOUT_4B, word_buf, wr_size); 411 ctrl->xfer.tx_buf = word_buf + wr_size; 412 413 } 414 415 return IRQ_HANDLED; 416 } 417 418 static irqreturn_t qcom_qspi_irq(int irq, void *dev_id) 419 { 420 u32 int_status; 421 struct qcom_qspi *ctrl = dev_id; 422 irqreturn_t ret = IRQ_NONE; 423 424 spin_lock(&ctrl->lock); 425 426 int_status = readl(ctrl->base + MSTR_INT_STATUS); 427 writel(int_status, ctrl->base + MSTR_INT_STATUS); 428 429 if (ctrl->xfer.dir == QSPI_WRITE) { 430 if (int_status & WR_FIFO_EMPTY) 431 ret = pio_write(ctrl); 432 } else { 433 if (int_status & RESP_FIFO_RDY) 434 ret = pio_read(ctrl); 435 } 436 437 if (int_status & QSPI_ERR_IRQS) { 438 if (int_status & RESP_FIFO_UNDERRUN) 439 dev_err(ctrl->dev, "IRQ error: FIFO underrun\n"); 440 if (int_status & WR_FIFO_OVERRUN) 441 dev_err(ctrl->dev, "IRQ error: FIFO overrun\n"); 442 if (int_status & HRESP_FROM_NOC_ERR) 443 dev_err(ctrl->dev, "IRQ error: NOC response error\n"); 444 ret = IRQ_HANDLED; 445 } 446 447 if (!ctrl->xfer.rem_bytes) { 448 writel(0, ctrl->base + MSTR_INT_EN); 449 spi_finalize_current_transfer(dev_get_drvdata(ctrl->dev)); 450 } 451 452 spin_unlock(&ctrl->lock); 453 return ret; 454 } 455 456 static int qcom_qspi_probe(struct platform_device *pdev) 457 { 458 int ret; 459 struct device *dev; 460 struct spi_master *master; 461 struct qcom_qspi *ctrl; 462 463 dev = &pdev->dev; 464 465 master = devm_spi_alloc_master(dev, sizeof(*ctrl)); 466 if (!master) 467 return -ENOMEM; 468 469 platform_set_drvdata(pdev, master); 470 471 ctrl = spi_master_get_devdata(master); 472 473 spin_lock_init(&ctrl->lock); 474 ctrl->dev = dev; 475 ctrl->base = devm_platform_ioremap_resource(pdev, 0); 476 if (IS_ERR(ctrl->base)) 477 return PTR_ERR(ctrl->base); 478 479 ctrl->clks = devm_kcalloc(dev, QSPI_NUM_CLKS, 480 sizeof(*ctrl->clks), GFP_KERNEL); 481 if (!ctrl->clks) 482 return -ENOMEM; 483 484 ctrl->clks[QSPI_CLK_CORE].id = "core"; 485 ctrl->clks[QSPI_CLK_IFACE].id = "iface"; 486 ret = devm_clk_bulk_get(dev, QSPI_NUM_CLKS, ctrl->clks); 487 if (ret) 488 return ret; 489 490 ctrl->icc_path_cpu_to_qspi = devm_of_icc_get(dev, "qspi-config"); 491 if (IS_ERR(ctrl->icc_path_cpu_to_qspi)) 492 return dev_err_probe(dev, PTR_ERR(ctrl->icc_path_cpu_to_qspi), 493 "Failed to get cpu path\n"); 494 495 /* Set BW vote for register access */ 496 ret = icc_set_bw(ctrl->icc_path_cpu_to_qspi, Bps_to_icc(1000), 497 Bps_to_icc(1000)); 498 if (ret) { 499 dev_err(ctrl->dev, "%s: ICC BW voting failed for cpu: %d\n", 500 __func__, ret); 501 return ret; 502 } 503 504 ret = icc_disable(ctrl->icc_path_cpu_to_qspi); 505 if (ret) { 506 dev_err(ctrl->dev, "%s: ICC disable failed for cpu: %d\n", 507 __func__, ret); 508 return ret; 509 } 510 511 ret = platform_get_irq(pdev, 0); 512 if (ret < 0) 513 return ret; 514 ret = devm_request_irq(dev, ret, qcom_qspi_irq, 515 IRQF_TRIGGER_HIGH, dev_name(dev), ctrl); 516 if (ret) { 517 dev_err(dev, "Failed to request irq %d\n", ret); 518 return ret; 519 } 520 521 master->max_speed_hz = 300000000; 522 master->num_chipselect = QSPI_NUM_CS; 523 master->bus_num = -1; 524 master->dev.of_node = pdev->dev.of_node; 525 master->mode_bits = SPI_MODE_0 | 526 SPI_TX_DUAL | SPI_RX_DUAL | 527 SPI_TX_QUAD | SPI_RX_QUAD; 528 master->flags = SPI_MASTER_HALF_DUPLEX; 529 master->prepare_message = qcom_qspi_prepare_message; 530 master->transfer_one = qcom_qspi_transfer_one; 531 master->handle_err = qcom_qspi_handle_err; 532 master->auto_runtime_pm = true; 533 534 ctrl->opp_table = dev_pm_opp_set_clkname(&pdev->dev, "core"); 535 if (IS_ERR(ctrl->opp_table)) 536 return PTR_ERR(ctrl->opp_table); 537 /* OPP table is optional */ 538 ret = dev_pm_opp_of_add_table(&pdev->dev); 539 if (ret && ret != -ENODEV) { 540 dev_err(&pdev->dev, "invalid OPP table in device tree\n"); 541 goto exit_probe_put_clkname; 542 } 543 544 pm_runtime_use_autosuspend(dev); 545 pm_runtime_set_autosuspend_delay(dev, 250); 546 pm_runtime_enable(dev); 547 548 ret = spi_register_master(master); 549 if (!ret) 550 return 0; 551 552 pm_runtime_disable(dev); 553 dev_pm_opp_of_remove_table(&pdev->dev); 554 555 exit_probe_put_clkname: 556 dev_pm_opp_put_clkname(ctrl->opp_table); 557 558 return ret; 559 } 560 561 static int qcom_qspi_remove(struct platform_device *pdev) 562 { 563 struct spi_master *master = platform_get_drvdata(pdev); 564 struct qcom_qspi *ctrl = spi_master_get_devdata(master); 565 566 /* Unregister _before_ disabling pm_runtime() so we stop transfers */ 567 spi_unregister_master(master); 568 569 pm_runtime_disable(&pdev->dev); 570 dev_pm_opp_of_remove_table(&pdev->dev); 571 dev_pm_opp_put_clkname(ctrl->opp_table); 572 573 return 0; 574 } 575 576 static int __maybe_unused qcom_qspi_runtime_suspend(struct device *dev) 577 { 578 struct spi_master *master = dev_get_drvdata(dev); 579 struct qcom_qspi *ctrl = spi_master_get_devdata(master); 580 int ret; 581 582 /* Drop the performance state vote */ 583 dev_pm_opp_set_rate(dev, 0); 584 clk_bulk_disable_unprepare(QSPI_NUM_CLKS, ctrl->clks); 585 586 ret = icc_disable(ctrl->icc_path_cpu_to_qspi); 587 if (ret) { 588 dev_err_ratelimited(ctrl->dev, "%s: ICC disable failed for cpu: %d\n", 589 __func__, ret); 590 return ret; 591 } 592 593 return 0; 594 } 595 596 static int __maybe_unused qcom_qspi_runtime_resume(struct device *dev) 597 { 598 struct spi_master *master = dev_get_drvdata(dev); 599 struct qcom_qspi *ctrl = spi_master_get_devdata(master); 600 int ret; 601 602 ret = icc_enable(ctrl->icc_path_cpu_to_qspi); 603 if (ret) { 604 dev_err_ratelimited(ctrl->dev, "%s: ICC enable failed for cpu: %d\n", 605 __func__, ret); 606 return ret; 607 } 608 609 ret = clk_bulk_prepare_enable(QSPI_NUM_CLKS, ctrl->clks); 610 if (ret) 611 return ret; 612 613 return dev_pm_opp_set_rate(dev, ctrl->last_speed * 4); 614 } 615 616 static int __maybe_unused qcom_qspi_suspend(struct device *dev) 617 { 618 struct spi_master *master = dev_get_drvdata(dev); 619 int ret; 620 621 ret = spi_master_suspend(master); 622 if (ret) 623 return ret; 624 625 ret = pm_runtime_force_suspend(dev); 626 if (ret) 627 spi_master_resume(master); 628 629 return ret; 630 } 631 632 static int __maybe_unused qcom_qspi_resume(struct device *dev) 633 { 634 struct spi_master *master = dev_get_drvdata(dev); 635 int ret; 636 637 ret = pm_runtime_force_resume(dev); 638 if (ret) 639 return ret; 640 641 ret = spi_master_resume(master); 642 if (ret) 643 pm_runtime_force_suspend(dev); 644 645 return ret; 646 } 647 648 static const struct dev_pm_ops qcom_qspi_dev_pm_ops = { 649 SET_RUNTIME_PM_OPS(qcom_qspi_runtime_suspend, 650 qcom_qspi_runtime_resume, NULL) 651 SET_SYSTEM_SLEEP_PM_OPS(qcom_qspi_suspend, qcom_qspi_resume) 652 }; 653 654 static const struct of_device_id qcom_qspi_dt_match[] = { 655 { .compatible = "qcom,qspi-v1", }, 656 { } 657 }; 658 MODULE_DEVICE_TABLE(of, qcom_qspi_dt_match); 659 660 static struct platform_driver qcom_qspi_driver = { 661 .driver = { 662 .name = "qcom_qspi", 663 .pm = &qcom_qspi_dev_pm_ops, 664 .of_match_table = qcom_qspi_dt_match, 665 }, 666 .probe = qcom_qspi_probe, 667 .remove = qcom_qspi_remove, 668 }; 669 module_platform_driver(qcom_qspi_driver); 670 671 MODULE_DESCRIPTION("SPI driver for QSPI cores"); 672 MODULE_LICENSE("GPL v2"); 673