1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * DaVinci MDIO Module driver 4 * 5 * Copyright (C) 2010 Texas Instruments. 6 * 7 * Shamelessly ripped out of davinci_emac.c, original copyrights follow: 8 * 9 * Copyright (C) 2009 Texas Instruments. 10 * 11 */ 12 #include <linux/module.h> 13 #include <linux/kernel.h> 14 #include <linux/platform_device.h> 15 #include <linux/delay.h> 16 #include <linux/sched.h> 17 #include <linux/slab.h> 18 #include <linux/phy.h> 19 #include <linux/clk.h> 20 #include <linux/err.h> 21 #include <linux/io.h> 22 #include <linux/iopoll.h> 23 #include <linux/pm_runtime.h> 24 #include <linux/davinci_emac.h> 25 #include <linux/of.h> 26 #include <linux/of_mdio.h> 27 #include <linux/pinctrl/consumer.h> 28 #include <linux/mdio-bitbang.h> 29 #include <linux/sys_soc.h> 30 31 /* 32 * This timeout definition is a worst-case ultra defensive measure against 33 * unexpected controller lock ups. Ideally, we should never ever hit this 34 * scenario in practice. 35 */ 36 #define MDIO_TIMEOUT 100 /* msecs */ 37 38 #define PHY_REG_MASK 0x1f 39 #define PHY_ID_MASK 0x1f 40 41 #define DEF_OUT_FREQ 2200000 /* 2.2 MHz */ 42 43 struct davinci_mdio_of_param { 44 int autosuspend_delay_ms; 45 bool manual_mode; 46 }; 47 48 struct davinci_mdio_regs { 49 u32 version; 50 u32 control; 51 #define CONTROL_IDLE BIT(31) 52 #define CONTROL_ENABLE BIT(30) 53 #define CONTROL_MAX_DIV (0xffff) 54 #define CONTROL_CLKDIV GENMASK(15, 0) 55 56 #define MDIO_MAN_MDCLK_O BIT(2) 57 #define MDIO_MAN_OE BIT(1) 58 #define MDIO_MAN_PIN BIT(0) 59 #define MDIO_MANUALMODE BIT(31) 60 61 #define MDIO_PIN 0 62 63 64 u32 alive; 65 u32 link; 66 u32 linkintraw; 67 u32 linkintmasked; 68 u32 __reserved_0[2]; 69 u32 userintraw; 70 u32 userintmasked; 71 u32 userintmaskset; 72 u32 userintmaskclr; 73 u32 manualif; 74 u32 poll; 75 u32 __reserved_1[18]; 76 77 struct { 78 u32 access; 79 #define USERACCESS_GO BIT(31) 80 #define USERACCESS_WRITE BIT(30) 81 #define USERACCESS_ACK BIT(29) 82 #define USERACCESS_READ (0) 83 #define USERACCESS_DATA (0xffff) 84 85 u32 physel; 86 } user[]; 87 }; 88 89 static const struct mdio_platform_data default_pdata = { 90 .bus_freq = DEF_OUT_FREQ, 91 }; 92 93 struct davinci_mdio_data { 94 struct mdio_platform_data pdata; 95 struct mdiobb_ctrl bb_ctrl; 96 struct davinci_mdio_regs __iomem *regs; 97 struct clk *clk; 98 struct device *dev; 99 struct mii_bus *bus; 100 bool active_in_suspend; 101 unsigned long access_time; /* jiffies */ 102 /* Indicates that driver shouldn't modify phy_mask in case 103 * if MDIO bus is registered from DT. 104 */ 105 bool skip_scan; 106 u32 clk_div; 107 bool manual_mode; 108 }; 109 110 static void davinci_mdio_init_clk(struct davinci_mdio_data *data) 111 { 112 u32 mdio_in, div, mdio_out_khz, access_time; 113 114 mdio_in = clk_get_rate(data->clk); 115 div = (mdio_in / data->pdata.bus_freq) - 1; 116 if (div > CONTROL_MAX_DIV) 117 div = CONTROL_MAX_DIV; 118 119 data->clk_div = div; 120 /* 121 * One mdio transaction consists of: 122 * 32 bits of preamble 123 * 32 bits of transferred data 124 * 24 bits of bus yield (not needed unless shared?) 125 */ 126 mdio_out_khz = mdio_in / (1000 * (div + 1)); 127 access_time = (88 * 1000) / mdio_out_khz; 128 129 /* 130 * In the worst case, we could be kicking off a user-access immediately 131 * after the mdio bus scan state-machine triggered its own read. If 132 * so, our request could get deferred by one access cycle. We 133 * defensively allow for 4 access cycles. 134 */ 135 data->access_time = usecs_to_jiffies(access_time * 4); 136 if (!data->access_time) 137 data->access_time = 1; 138 } 139 140 static void davinci_mdio_enable(struct davinci_mdio_data *data) 141 { 142 /* set enable and clock divider */ 143 writel(data->clk_div | CONTROL_ENABLE, &data->regs->control); 144 } 145 146 static void davinci_mdio_disable(struct davinci_mdio_data *data) 147 { 148 u32 reg; 149 150 /* Disable MDIO state machine */ 151 reg = readl(&data->regs->control); 152 153 reg &= ~CONTROL_CLKDIV; 154 reg |= data->clk_div; 155 156 reg &= ~CONTROL_ENABLE; 157 writel(reg, &data->regs->control); 158 } 159 160 static void davinci_mdio_enable_manual_mode(struct davinci_mdio_data *data) 161 { 162 u32 reg; 163 /* set manual mode */ 164 reg = readl(&data->regs->poll); 165 reg |= MDIO_MANUALMODE; 166 writel(reg, &data->regs->poll); 167 } 168 169 static void davinci_set_mdc(struct mdiobb_ctrl *ctrl, int level) 170 { 171 struct davinci_mdio_data *data; 172 u32 reg; 173 174 data = container_of(ctrl, struct davinci_mdio_data, bb_ctrl); 175 reg = readl(&data->regs->manualif); 176 177 if (level) 178 reg |= MDIO_MAN_MDCLK_O; 179 else 180 reg &= ~MDIO_MAN_MDCLK_O; 181 182 writel(reg, &data->regs->manualif); 183 } 184 185 static void davinci_set_mdio_dir(struct mdiobb_ctrl *ctrl, int output) 186 { 187 struct davinci_mdio_data *data; 188 u32 reg; 189 190 data = container_of(ctrl, struct davinci_mdio_data, bb_ctrl); 191 reg = readl(&data->regs->manualif); 192 193 if (output) 194 reg |= MDIO_MAN_OE; 195 else 196 reg &= ~MDIO_MAN_OE; 197 198 writel(reg, &data->regs->manualif); 199 } 200 201 static void davinci_set_mdio_data(struct mdiobb_ctrl *ctrl, int value) 202 { 203 struct davinci_mdio_data *data; 204 u32 reg; 205 206 data = container_of(ctrl, struct davinci_mdio_data, bb_ctrl); 207 reg = readl(&data->regs->manualif); 208 209 if (value) 210 reg |= MDIO_MAN_PIN; 211 else 212 reg &= ~MDIO_MAN_PIN; 213 214 writel(reg, &data->regs->manualif); 215 } 216 217 static int davinci_get_mdio_data(struct mdiobb_ctrl *ctrl) 218 { 219 struct davinci_mdio_data *data; 220 unsigned long reg; 221 222 data = container_of(ctrl, struct davinci_mdio_data, bb_ctrl); 223 reg = readl(&data->regs->manualif); 224 return test_bit(MDIO_PIN, ®); 225 } 226 227 static int davinci_mdiobb_read_c22(struct mii_bus *bus, int phy, int reg) 228 { 229 int ret; 230 231 ret = pm_runtime_resume_and_get(bus->parent); 232 if (ret < 0) 233 return ret; 234 235 ret = mdiobb_read_c22(bus, phy, reg); 236 237 pm_runtime_mark_last_busy(bus->parent); 238 pm_runtime_put_autosuspend(bus->parent); 239 240 return ret; 241 } 242 243 static int davinci_mdiobb_write_c22(struct mii_bus *bus, int phy, int reg, 244 u16 val) 245 { 246 int ret; 247 248 ret = pm_runtime_resume_and_get(bus->parent); 249 if (ret < 0) 250 return ret; 251 252 ret = mdiobb_write_c22(bus, phy, reg, val); 253 254 pm_runtime_mark_last_busy(bus->parent); 255 pm_runtime_put_autosuspend(bus->parent); 256 257 return ret; 258 } 259 260 static int davinci_mdiobb_read_c45(struct mii_bus *bus, int phy, int devad, 261 int reg) 262 { 263 int ret; 264 265 ret = pm_runtime_resume_and_get(bus->parent); 266 if (ret < 0) 267 return ret; 268 269 ret = mdiobb_read_c45(bus, phy, devad, reg); 270 271 pm_runtime_mark_last_busy(bus->parent); 272 pm_runtime_put_autosuspend(bus->parent); 273 274 return ret; 275 } 276 277 static int davinci_mdiobb_write_c45(struct mii_bus *bus, int phy, int devad, 278 int reg, u16 val) 279 { 280 int ret; 281 282 ret = pm_runtime_resume_and_get(bus->parent); 283 if (ret < 0) 284 return ret; 285 286 ret = mdiobb_write_c45(bus, phy, devad, reg, val); 287 288 pm_runtime_mark_last_busy(bus->parent); 289 pm_runtime_put_autosuspend(bus->parent); 290 291 return ret; 292 } 293 294 static int davinci_mdio_common_reset(struct davinci_mdio_data *data) 295 { 296 u32 phy_mask, ver; 297 int ret; 298 299 ret = pm_runtime_resume_and_get(data->dev); 300 if (ret < 0) 301 return ret; 302 303 if (data->manual_mode) { 304 davinci_mdio_disable(data); 305 davinci_mdio_enable_manual_mode(data); 306 } 307 308 /* wait for scan logic to settle */ 309 msleep(PHY_MAX_ADDR * data->access_time); 310 311 /* dump hardware version info */ 312 ver = readl(&data->regs->version); 313 dev_info(data->dev, 314 "davinci mdio revision %d.%d, bus freq %ld\n", 315 (ver >> 8) & 0xff, ver & 0xff, 316 data->pdata.bus_freq); 317 318 if (data->skip_scan) 319 goto done; 320 321 /* get phy mask from the alive register */ 322 phy_mask = readl(&data->regs->alive); 323 if (phy_mask) { 324 /* restrict mdio bus to live phys only */ 325 dev_info(data->dev, "detected phy mask %x\n", ~phy_mask); 326 phy_mask = ~phy_mask; 327 } else { 328 /* desperately scan all phys */ 329 dev_warn(data->dev, "no live phy, scanning all\n"); 330 phy_mask = 0; 331 } 332 data->bus->phy_mask = phy_mask; 333 334 done: 335 pm_runtime_mark_last_busy(data->dev); 336 pm_runtime_put_autosuspend(data->dev); 337 338 return 0; 339 } 340 341 static int davinci_mdio_reset(struct mii_bus *bus) 342 { 343 struct davinci_mdio_data *data = bus->priv; 344 345 return davinci_mdio_common_reset(data); 346 } 347 348 static int davinci_mdiobb_reset(struct mii_bus *bus) 349 { 350 struct mdiobb_ctrl *ctrl = bus->priv; 351 struct davinci_mdio_data *data; 352 353 data = container_of(ctrl, struct davinci_mdio_data, bb_ctrl); 354 355 return davinci_mdio_common_reset(data); 356 } 357 358 /* wait until hardware is ready for another user access */ 359 static inline int wait_for_user_access(struct davinci_mdio_data *data) 360 { 361 struct davinci_mdio_regs __iomem *regs = data->regs; 362 unsigned long timeout = jiffies + msecs_to_jiffies(MDIO_TIMEOUT); 363 u32 reg; 364 365 while (time_after(timeout, jiffies)) { 366 reg = readl(®s->user[0].access); 367 if ((reg & USERACCESS_GO) == 0) 368 return 0; 369 370 reg = readl(®s->control); 371 if ((reg & CONTROL_IDLE) == 0) { 372 usleep_range(100, 200); 373 continue; 374 } 375 376 /* 377 * An emac soft_reset may have clobbered the mdio controller's 378 * state machine. We need to reset and retry the current 379 * operation 380 */ 381 dev_warn(data->dev, "resetting idled controller\n"); 382 davinci_mdio_enable(data); 383 return -EAGAIN; 384 } 385 386 reg = readl(®s->user[0].access); 387 if ((reg & USERACCESS_GO) == 0) 388 return 0; 389 390 dev_err(data->dev, "timed out waiting for user access\n"); 391 return -ETIMEDOUT; 392 } 393 394 /* wait until hardware state machine is idle */ 395 static inline int wait_for_idle(struct davinci_mdio_data *data) 396 { 397 struct davinci_mdio_regs __iomem *regs = data->regs; 398 u32 val, ret; 399 400 ret = readl_poll_timeout(®s->control, val, val & CONTROL_IDLE, 401 0, MDIO_TIMEOUT * 1000); 402 if (ret) 403 dev_err(data->dev, "timed out waiting for idle\n"); 404 405 return ret; 406 } 407 408 static int davinci_mdio_read(struct mii_bus *bus, int phy_id, int phy_reg) 409 { 410 struct davinci_mdio_data *data = bus->priv; 411 u32 reg; 412 int ret; 413 414 if (phy_reg & ~PHY_REG_MASK || phy_id & ~PHY_ID_MASK) 415 return -EINVAL; 416 417 ret = pm_runtime_resume_and_get(data->dev); 418 if (ret < 0) 419 return ret; 420 421 reg = (USERACCESS_GO | USERACCESS_READ | (phy_reg << 21) | 422 (phy_id << 16)); 423 424 while (1) { 425 ret = wait_for_user_access(data); 426 if (ret == -EAGAIN) 427 continue; 428 if (ret < 0) 429 break; 430 431 writel(reg, &data->regs->user[0].access); 432 433 ret = wait_for_user_access(data); 434 if (ret == -EAGAIN) 435 continue; 436 if (ret < 0) 437 break; 438 439 reg = readl(&data->regs->user[0].access); 440 ret = (reg & USERACCESS_ACK) ? (reg & USERACCESS_DATA) : -EIO; 441 break; 442 } 443 444 pm_runtime_mark_last_busy(data->dev); 445 pm_runtime_put_autosuspend(data->dev); 446 return ret; 447 } 448 449 static int davinci_mdio_write(struct mii_bus *bus, int phy_id, 450 int phy_reg, u16 phy_data) 451 { 452 struct davinci_mdio_data *data = bus->priv; 453 u32 reg; 454 int ret; 455 456 if (phy_reg & ~PHY_REG_MASK || phy_id & ~PHY_ID_MASK) 457 return -EINVAL; 458 459 ret = pm_runtime_resume_and_get(data->dev); 460 if (ret < 0) 461 return ret; 462 463 reg = (USERACCESS_GO | USERACCESS_WRITE | (phy_reg << 21) | 464 (phy_id << 16) | (phy_data & USERACCESS_DATA)); 465 466 while (1) { 467 ret = wait_for_user_access(data); 468 if (ret == -EAGAIN) 469 continue; 470 if (ret < 0) 471 break; 472 473 writel(reg, &data->regs->user[0].access); 474 475 ret = wait_for_user_access(data); 476 if (ret == -EAGAIN) 477 continue; 478 break; 479 } 480 481 pm_runtime_mark_last_busy(data->dev); 482 pm_runtime_put_autosuspend(data->dev); 483 484 return ret; 485 } 486 487 static int davinci_mdio_probe_dt(struct mdio_platform_data *data, 488 struct platform_device *pdev) 489 { 490 struct device_node *node = pdev->dev.of_node; 491 u32 prop; 492 493 if (!node) 494 return -EINVAL; 495 496 if (of_property_read_u32(node, "bus_freq", &prop)) { 497 dev_err(&pdev->dev, "Missing bus_freq property in the DT.\n"); 498 return -EINVAL; 499 } 500 data->bus_freq = prop; 501 502 return 0; 503 } 504 505 struct k3_mdio_soc_data { 506 bool manual_mode; 507 }; 508 509 static const struct k3_mdio_soc_data am65_mdio_soc_data = { 510 .manual_mode = true, 511 }; 512 513 static const struct soc_device_attribute k3_mdio_socinfo[] = { 514 { .family = "AM62X", .revision = "SR1.0", .data = &am65_mdio_soc_data }, 515 { .family = "AM64X", .revision = "SR1.0", .data = &am65_mdio_soc_data }, 516 { .family = "AM64X", .revision = "SR2.0", .data = &am65_mdio_soc_data }, 517 { .family = "AM65X", .revision = "SR1.0", .data = &am65_mdio_soc_data }, 518 { .family = "AM65X", .revision = "SR2.0", .data = &am65_mdio_soc_data }, 519 { .family = "J7200", .revision = "SR1.0", .data = &am65_mdio_soc_data }, 520 { .family = "J7200", .revision = "SR2.0", .data = &am65_mdio_soc_data }, 521 { .family = "J721E", .revision = "SR1.0", .data = &am65_mdio_soc_data }, 522 { .family = "J721E", .revision = "SR2.0", .data = &am65_mdio_soc_data }, 523 { .family = "J721S2", .revision = "SR1.0", .data = &am65_mdio_soc_data}, 524 { /* sentinel */ }, 525 }; 526 527 #if IS_ENABLED(CONFIG_OF) 528 static const struct davinci_mdio_of_param of_cpsw_mdio_data = { 529 .autosuspend_delay_ms = 100, 530 }; 531 532 static const struct of_device_id davinci_mdio_of_mtable[] = { 533 { .compatible = "ti,davinci_mdio", }, 534 { .compatible = "ti,cpsw-mdio", .data = &of_cpsw_mdio_data}, 535 { /* sentinel */ }, 536 }; 537 MODULE_DEVICE_TABLE(of, davinci_mdio_of_mtable); 538 #endif 539 540 static const struct mdiobb_ops davinci_mdiobb_ops = { 541 .owner = THIS_MODULE, 542 .set_mdc = davinci_set_mdc, 543 .set_mdio_dir = davinci_set_mdio_dir, 544 .set_mdio_data = davinci_set_mdio_data, 545 .get_mdio_data = davinci_get_mdio_data, 546 }; 547 548 static int davinci_mdio_probe(struct platform_device *pdev) 549 { 550 struct mdio_platform_data *pdata = dev_get_platdata(&pdev->dev); 551 struct device *dev = &pdev->dev; 552 struct davinci_mdio_data *data; 553 struct resource *res; 554 struct phy_device *phy; 555 int ret, addr; 556 int autosuspend_delay_ms = -1; 557 558 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 559 if (!data) 560 return -ENOMEM; 561 562 data->manual_mode = false; 563 data->bb_ctrl.ops = &davinci_mdiobb_ops; 564 565 if (IS_ENABLED(CONFIG_OF) && dev->of_node) { 566 const struct soc_device_attribute *soc_match_data; 567 568 soc_match_data = soc_device_match(k3_mdio_socinfo); 569 if (soc_match_data && soc_match_data->data) { 570 const struct k3_mdio_soc_data *socdata = 571 soc_match_data->data; 572 573 data->manual_mode = socdata->manual_mode; 574 } 575 } 576 577 if (data->manual_mode) 578 data->bus = alloc_mdio_bitbang(&data->bb_ctrl); 579 else 580 data->bus = devm_mdiobus_alloc(dev); 581 582 if (!data->bus) { 583 dev_err(dev, "failed to alloc mii bus\n"); 584 return -ENOMEM; 585 } 586 587 if (IS_ENABLED(CONFIG_OF) && dev->of_node) { 588 const struct davinci_mdio_of_param *of_mdio_data; 589 590 ret = davinci_mdio_probe_dt(&data->pdata, pdev); 591 if (ret) 592 return ret; 593 snprintf(data->bus->id, MII_BUS_ID_SIZE, "%s", pdev->name); 594 595 of_mdio_data = of_device_get_match_data(&pdev->dev); 596 if (of_mdio_data) { 597 autosuspend_delay_ms = 598 of_mdio_data->autosuspend_delay_ms; 599 } 600 } else { 601 data->pdata = pdata ? (*pdata) : default_pdata; 602 snprintf(data->bus->id, MII_BUS_ID_SIZE, "%s-%x", 603 pdev->name, pdev->id); 604 } 605 606 data->bus->name = dev_name(dev); 607 608 if (data->manual_mode) { 609 data->bus->read = davinci_mdiobb_read_c22; 610 data->bus->write = davinci_mdiobb_write_c22; 611 data->bus->read_c45 = davinci_mdiobb_read_c45; 612 data->bus->write_c45 = davinci_mdiobb_write_c45; 613 data->bus->reset = davinci_mdiobb_reset; 614 615 dev_info(dev, "Configuring MDIO in manual mode\n"); 616 } else { 617 data->bus->read = davinci_mdio_read; 618 data->bus->write = davinci_mdio_write; 619 data->bus->reset = davinci_mdio_reset; 620 data->bus->priv = data; 621 } 622 data->bus->parent = dev; 623 624 data->clk = devm_clk_get(dev, "fck"); 625 if (IS_ERR(data->clk)) { 626 dev_err(dev, "failed to get device clock\n"); 627 return PTR_ERR(data->clk); 628 } 629 630 dev_set_drvdata(dev, data); 631 data->dev = dev; 632 633 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 634 if (!res) 635 return -EINVAL; 636 data->regs = devm_ioremap(dev, res->start, resource_size(res)); 637 if (!data->regs) 638 return -ENOMEM; 639 640 davinci_mdio_init_clk(data); 641 642 pm_runtime_set_autosuspend_delay(&pdev->dev, autosuspend_delay_ms); 643 pm_runtime_use_autosuspend(&pdev->dev); 644 pm_runtime_enable(&pdev->dev); 645 646 /* register the mii bus 647 * Create PHYs from DT only in case if PHY child nodes are explicitly 648 * defined to support backward compatibility with DTs which assume that 649 * Davinci MDIO will always scan the bus for PHYs detection. 650 */ 651 if (dev->of_node && of_get_child_count(dev->of_node)) 652 data->skip_scan = true; 653 654 ret = of_mdiobus_register(data->bus, dev->of_node); 655 if (ret) 656 goto bail_out; 657 658 /* scan and dump the bus */ 659 for (addr = 0; addr < PHY_MAX_ADDR; addr++) { 660 phy = mdiobus_get_phy(data->bus, addr); 661 if (phy) { 662 dev_info(dev, "phy[%d]: device %s, driver %s\n", 663 phy->mdio.addr, phydev_name(phy), 664 phy->drv ? phy->drv->name : "unknown"); 665 } 666 } 667 668 return 0; 669 670 bail_out: 671 pm_runtime_dont_use_autosuspend(&pdev->dev); 672 pm_runtime_disable(&pdev->dev); 673 return ret; 674 } 675 676 static int davinci_mdio_remove(struct platform_device *pdev) 677 { 678 struct davinci_mdio_data *data = platform_get_drvdata(pdev); 679 680 if (data->bus) { 681 mdiobus_unregister(data->bus); 682 683 if (data->manual_mode) 684 free_mdio_bitbang(data->bus); 685 } 686 687 pm_runtime_dont_use_autosuspend(&pdev->dev); 688 pm_runtime_disable(&pdev->dev); 689 690 return 0; 691 } 692 693 #ifdef CONFIG_PM 694 static int davinci_mdio_runtime_suspend(struct device *dev) 695 { 696 struct davinci_mdio_data *data = dev_get_drvdata(dev); 697 u32 ctrl; 698 699 /* shutdown the scan state machine */ 700 ctrl = readl(&data->regs->control); 701 ctrl &= ~CONTROL_ENABLE; 702 writel(ctrl, &data->regs->control); 703 704 if (!data->manual_mode) 705 wait_for_idle(data); 706 707 return 0; 708 } 709 710 static int davinci_mdio_runtime_resume(struct device *dev) 711 { 712 struct davinci_mdio_data *data = dev_get_drvdata(dev); 713 714 if (data->manual_mode) { 715 davinci_mdio_disable(data); 716 davinci_mdio_enable_manual_mode(data); 717 } else { 718 davinci_mdio_enable(data); 719 } 720 return 0; 721 } 722 #endif 723 724 #ifdef CONFIG_PM_SLEEP 725 static int davinci_mdio_suspend(struct device *dev) 726 { 727 struct davinci_mdio_data *data = dev_get_drvdata(dev); 728 int ret = 0; 729 730 data->active_in_suspend = !pm_runtime_status_suspended(dev); 731 if (data->active_in_suspend) 732 ret = pm_runtime_force_suspend(dev); 733 if (ret < 0) 734 return ret; 735 736 /* Select sleep pin state */ 737 pinctrl_pm_select_sleep_state(dev); 738 739 return 0; 740 } 741 742 static int davinci_mdio_resume(struct device *dev) 743 { 744 struct davinci_mdio_data *data = dev_get_drvdata(dev); 745 746 /* Select default pin state */ 747 pinctrl_pm_select_default_state(dev); 748 749 if (data->active_in_suspend) 750 pm_runtime_force_resume(dev); 751 752 return 0; 753 } 754 #endif 755 756 static const struct dev_pm_ops davinci_mdio_pm_ops = { 757 SET_RUNTIME_PM_OPS(davinci_mdio_runtime_suspend, 758 davinci_mdio_runtime_resume, NULL) 759 SET_LATE_SYSTEM_SLEEP_PM_OPS(davinci_mdio_suspend, davinci_mdio_resume) 760 }; 761 762 static struct platform_driver davinci_mdio_driver = { 763 .driver = { 764 .name = "davinci_mdio", 765 .pm = &davinci_mdio_pm_ops, 766 .of_match_table = of_match_ptr(davinci_mdio_of_mtable), 767 }, 768 .probe = davinci_mdio_probe, 769 .remove = davinci_mdio_remove, 770 }; 771 772 static int __init davinci_mdio_init(void) 773 { 774 return platform_driver_register(&davinci_mdio_driver); 775 } 776 device_initcall(davinci_mdio_init); 777 778 static void __exit davinci_mdio_exit(void) 779 { 780 platform_driver_unregister(&davinci_mdio_driver); 781 } 782 module_exit(davinci_mdio_exit); 783 784 MODULE_LICENSE("GPL"); 785 MODULE_DESCRIPTION("DaVinci MDIO driver"); 786