1 /* 2 * AHCI SATA platform library 3 * 4 * Copyright 2004-2005 Red Hat, Inc. 5 * Jeff Garzik <jgarzik@pobox.com> 6 * Copyright 2010 MontaVista Software, LLC. 7 * Anton Vorontsov <avorontsov@ru.mvista.com> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2, or (at your option) 12 * any later version. 13 */ 14 15 #include <linux/clk.h> 16 #include <linux/kernel.h> 17 #include <linux/gfp.h> 18 #include <linux/module.h> 19 #include <linux/pm.h> 20 #include <linux/interrupt.h> 21 #include <linux/device.h> 22 #include <linux/platform_device.h> 23 #include <linux/libata.h> 24 #include <linux/ahci_platform.h> 25 #include <linux/phy/phy.h> 26 #include <linux/pm_runtime.h> 27 #include <linux/of_platform.h> 28 #include <linux/reset.h> 29 #include "ahci.h" 30 31 static void ahci_host_stop(struct ata_host *host); 32 33 struct ata_port_operations ahci_platform_ops = { 34 .inherits = &ahci_ops, 35 .host_stop = ahci_host_stop, 36 }; 37 EXPORT_SYMBOL_GPL(ahci_platform_ops); 38 39 /** 40 * ahci_platform_enable_phys - Enable PHYs 41 * @hpriv: host private area to store config values 42 * 43 * This function enables all the PHYs found in hpriv->phys, if any. 44 * If a PHY fails to be enabled, it disables all the PHYs already 45 * enabled in reverse order and returns an error. 46 * 47 * RETURNS: 48 * 0 on success otherwise a negative error code 49 */ 50 static int ahci_platform_enable_phys(struct ahci_host_priv *hpriv) 51 { 52 int rc, i; 53 54 for (i = 0; i < hpriv->nports; i++) { 55 rc = phy_init(hpriv->phys[i]); 56 if (rc) 57 goto disable_phys; 58 59 rc = phy_power_on(hpriv->phys[i]); 60 if (rc) { 61 phy_exit(hpriv->phys[i]); 62 goto disable_phys; 63 } 64 } 65 66 return 0; 67 68 disable_phys: 69 while (--i >= 0) { 70 phy_power_off(hpriv->phys[i]); 71 phy_exit(hpriv->phys[i]); 72 } 73 return rc; 74 } 75 76 /** 77 * ahci_platform_disable_phys - Disable PHYs 78 * @hpriv: host private area to store config values 79 * 80 * This function disables all PHYs found in hpriv->phys. 81 */ 82 static void ahci_platform_disable_phys(struct ahci_host_priv *hpriv) 83 { 84 int i; 85 86 for (i = 0; i < hpriv->nports; i++) { 87 phy_power_off(hpriv->phys[i]); 88 phy_exit(hpriv->phys[i]); 89 } 90 } 91 92 /** 93 * ahci_platform_enable_clks - Enable platform clocks 94 * @hpriv: host private area to store config values 95 * 96 * This function enables all the clks found in hpriv->clks, starting at 97 * index 0. If any clk fails to enable it disables all the clks already 98 * enabled in reverse order, and then returns an error. 99 * 100 * RETURNS: 101 * 0 on success otherwise a negative error code 102 */ 103 int ahci_platform_enable_clks(struct ahci_host_priv *hpriv) 104 { 105 int c, rc; 106 107 for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) { 108 rc = clk_prepare_enable(hpriv->clks[c]); 109 if (rc) 110 goto disable_unprepare_clk; 111 } 112 return 0; 113 114 disable_unprepare_clk: 115 while (--c >= 0) 116 clk_disable_unprepare(hpriv->clks[c]); 117 return rc; 118 } 119 EXPORT_SYMBOL_GPL(ahci_platform_enable_clks); 120 121 /** 122 * ahci_platform_disable_clks - Disable platform clocks 123 * @hpriv: host private area to store config values 124 * 125 * This function disables all the clks found in hpriv->clks, in reverse 126 * order of ahci_platform_enable_clks (starting at the end of the array). 127 */ 128 void ahci_platform_disable_clks(struct ahci_host_priv *hpriv) 129 { 130 int c; 131 132 for (c = AHCI_MAX_CLKS - 1; c >= 0; c--) 133 if (hpriv->clks[c]) 134 clk_disable_unprepare(hpriv->clks[c]); 135 } 136 EXPORT_SYMBOL_GPL(ahci_platform_disable_clks); 137 138 /** 139 * ahci_platform_enable_regulators - Enable regulators 140 * @hpriv: host private area to store config values 141 * 142 * This function enables all the regulators found in 143 * hpriv->target_pwrs, if any. If a regulator fails to be enabled, it 144 * disables all the regulators already enabled in reverse order and 145 * returns an error. 146 * 147 * RETURNS: 148 * 0 on success otherwise a negative error code 149 */ 150 int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv) 151 { 152 int rc, i; 153 154 for (i = 0; i < hpriv->nports; i++) { 155 if (!hpriv->target_pwrs[i]) 156 continue; 157 158 rc = regulator_enable(hpriv->target_pwrs[i]); 159 if (rc) 160 goto disable_target_pwrs; 161 } 162 163 return 0; 164 165 disable_target_pwrs: 166 while (--i >= 0) 167 if (hpriv->target_pwrs[i]) 168 regulator_disable(hpriv->target_pwrs[i]); 169 170 return rc; 171 } 172 EXPORT_SYMBOL_GPL(ahci_platform_enable_regulators); 173 174 /** 175 * ahci_platform_disable_regulators - Disable regulators 176 * @hpriv: host private area to store config values 177 * 178 * This function disables all regulators found in hpriv->target_pwrs. 179 */ 180 void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv) 181 { 182 int i; 183 184 for (i = 0; i < hpriv->nports; i++) { 185 if (!hpriv->target_pwrs[i]) 186 continue; 187 regulator_disable(hpriv->target_pwrs[i]); 188 } 189 } 190 EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators); 191 /** 192 * ahci_platform_enable_resources - Enable platform resources 193 * @hpriv: host private area to store config values 194 * 195 * This function enables all ahci_platform managed resources in the 196 * following order: 197 * 1) Regulator 198 * 2) Clocks (through ahci_platform_enable_clks) 199 * 3) Resets 200 * 4) Phys 201 * 202 * If resource enabling fails at any point the previous enabled resources 203 * are disabled in reverse order. 204 * 205 * RETURNS: 206 * 0 on success otherwise a negative error code 207 */ 208 int ahci_platform_enable_resources(struct ahci_host_priv *hpriv) 209 { 210 int rc; 211 212 rc = ahci_platform_enable_regulators(hpriv); 213 if (rc) 214 return rc; 215 216 rc = ahci_platform_enable_clks(hpriv); 217 if (rc) 218 goto disable_regulator; 219 220 rc = reset_control_deassert(hpriv->rsts); 221 if (rc) 222 goto disable_clks; 223 224 rc = ahci_platform_enable_phys(hpriv); 225 if (rc) 226 goto disable_resets; 227 228 return 0; 229 230 disable_resets: 231 reset_control_assert(hpriv->rsts); 232 233 disable_clks: 234 ahci_platform_disable_clks(hpriv); 235 236 disable_regulator: 237 ahci_platform_disable_regulators(hpriv); 238 239 return rc; 240 } 241 EXPORT_SYMBOL_GPL(ahci_platform_enable_resources); 242 243 /** 244 * ahci_platform_disable_resources - Disable platform resources 245 * @hpriv: host private area to store config values 246 * 247 * This function disables all ahci_platform managed resources in the 248 * following order: 249 * 1) Phys 250 * 2) Resets 251 * 3) Clocks (through ahci_platform_disable_clks) 252 * 4) Regulator 253 */ 254 void ahci_platform_disable_resources(struct ahci_host_priv *hpriv) 255 { 256 ahci_platform_disable_phys(hpriv); 257 258 reset_control_assert(hpriv->rsts); 259 260 ahci_platform_disable_clks(hpriv); 261 262 ahci_platform_disable_regulators(hpriv); 263 } 264 EXPORT_SYMBOL_GPL(ahci_platform_disable_resources); 265 266 static void ahci_platform_put_resources(struct device *dev, void *res) 267 { 268 struct ahci_host_priv *hpriv = res; 269 int c; 270 271 if (hpriv->got_runtime_pm) { 272 pm_runtime_put_sync(dev); 273 pm_runtime_disable(dev); 274 } 275 276 for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) 277 clk_put(hpriv->clks[c]); 278 /* 279 * The regulators are tied to child node device and not to the 280 * SATA device itself. So we can't use devm for automatically 281 * releasing them. We have to do it manually here. 282 */ 283 for (c = 0; c < hpriv->nports; c++) 284 if (hpriv->target_pwrs && hpriv->target_pwrs[c]) 285 regulator_put(hpriv->target_pwrs[c]); 286 287 kfree(hpriv->target_pwrs); 288 } 289 290 static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port, 291 struct device *dev, struct device_node *node) 292 { 293 int rc; 294 295 hpriv->phys[port] = devm_of_phy_get(dev, node, NULL); 296 297 if (!IS_ERR(hpriv->phys[port])) 298 return 0; 299 300 rc = PTR_ERR(hpriv->phys[port]); 301 switch (rc) { 302 case -ENOSYS: 303 /* No PHY support. Check if PHY is required. */ 304 if (of_find_property(node, "phys", NULL)) { 305 dev_err(dev, 306 "couldn't get PHY in node %s: ENOSYS\n", 307 node->name); 308 break; 309 } 310 /* fall through */ 311 case -ENODEV: 312 /* continue normally */ 313 hpriv->phys[port] = NULL; 314 rc = 0; 315 break; 316 317 default: 318 dev_err(dev, 319 "couldn't get PHY in node %s: %d\n", 320 node->name, rc); 321 322 break; 323 } 324 325 return rc; 326 } 327 328 static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port, 329 struct device *dev) 330 { 331 struct regulator *target_pwr; 332 int rc = 0; 333 334 target_pwr = regulator_get_optional(dev, "target"); 335 336 if (!IS_ERR(target_pwr)) 337 hpriv->target_pwrs[port] = target_pwr; 338 else 339 rc = PTR_ERR(target_pwr); 340 341 return rc; 342 } 343 344 /** 345 * ahci_platform_get_resources - Get platform resources 346 * @pdev: platform device to get resources for 347 * @flags: bitmap representing the resource to get 348 * 349 * This function allocates an ahci_host_priv struct, and gets the following 350 * resources, storing a reference to them inside the returned struct: 351 * 352 * 1) mmio registers (IORESOURCE_MEM 0, mandatory) 353 * 2) regulator for controlling the targets power (optional) 354 * 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node, 355 * or for non devicetree enabled platforms a single clock 356 * 4) resets, if flags has AHCI_PLATFORM_GET_RESETS (optional) 357 * 5) phys (optional) 358 * 359 * RETURNS: 360 * The allocated ahci_host_priv on success, otherwise an ERR_PTR value 361 */ 362 struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev, 363 unsigned int flags) 364 { 365 struct device *dev = &pdev->dev; 366 struct ahci_host_priv *hpriv; 367 struct clk *clk; 368 struct device_node *child; 369 int i, enabled_ports = 0, rc = -ENOMEM, child_nodes; 370 u32 mask_port_map = 0; 371 372 if (!devres_open_group(dev, NULL, GFP_KERNEL)) 373 return ERR_PTR(-ENOMEM); 374 375 hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv), 376 GFP_KERNEL); 377 if (!hpriv) 378 goto err_out; 379 380 devres_add(dev, hpriv); 381 382 hpriv->mmio = devm_ioremap_resource(dev, 383 platform_get_resource(pdev, IORESOURCE_MEM, 0)); 384 if (IS_ERR(hpriv->mmio)) { 385 dev_err(dev, "no mmio space\n"); 386 rc = PTR_ERR(hpriv->mmio); 387 goto err_out; 388 } 389 390 for (i = 0; i < AHCI_MAX_CLKS; i++) { 391 /* 392 * For now we must use clk_get(dev, NULL) for the first clock, 393 * because some platforms (da850, spear13xx) are not yet 394 * converted to use devicetree for clocks. For new platforms 395 * this is equivalent to of_clk_get(dev->of_node, 0). 396 */ 397 if (i == 0) 398 clk = clk_get(dev, NULL); 399 else 400 clk = of_clk_get(dev->of_node, i); 401 402 if (IS_ERR(clk)) { 403 rc = PTR_ERR(clk); 404 if (rc == -EPROBE_DEFER) 405 goto err_out; 406 break; 407 } 408 hpriv->clks[i] = clk; 409 } 410 411 if (flags & AHCI_PLATFORM_GET_RESETS) { 412 hpriv->rsts = devm_reset_control_array_get_optional_shared(dev); 413 if (IS_ERR(hpriv->rsts)) { 414 rc = PTR_ERR(hpriv->rsts); 415 goto err_out; 416 } 417 } 418 419 hpriv->nports = child_nodes = of_get_child_count(dev->of_node); 420 421 /* 422 * If no sub-node was found, we still need to set nports to 423 * one in order to be able to use the 424 * ahci_platform_[en|dis]able_[phys|regulators] functions. 425 */ 426 if (!child_nodes) 427 hpriv->nports = 1; 428 429 hpriv->phys = devm_kcalloc(dev, hpriv->nports, sizeof(*hpriv->phys), GFP_KERNEL); 430 if (!hpriv->phys) { 431 rc = -ENOMEM; 432 goto err_out; 433 } 434 /* 435 * We cannot use devm_ here, since ahci_platform_put_resources() uses 436 * target_pwrs after devm_ have freed memory 437 */ 438 hpriv->target_pwrs = kcalloc(hpriv->nports, sizeof(*hpriv->target_pwrs), GFP_KERNEL); 439 if (!hpriv->target_pwrs) { 440 rc = -ENOMEM; 441 goto err_out; 442 } 443 444 if (child_nodes) { 445 for_each_child_of_node(dev->of_node, child) { 446 u32 port; 447 struct platform_device *port_dev __maybe_unused; 448 449 if (!of_device_is_available(child)) 450 continue; 451 452 if (of_property_read_u32(child, "reg", &port)) { 453 rc = -EINVAL; 454 goto err_out; 455 } 456 457 if (port >= hpriv->nports) { 458 dev_warn(dev, "invalid port number %d\n", port); 459 continue; 460 } 461 mask_port_map |= BIT(port); 462 463 #ifdef CONFIG_OF_ADDRESS 464 of_platform_device_create(child, NULL, NULL); 465 466 port_dev = of_find_device_by_node(child); 467 468 if (port_dev) { 469 rc = ahci_platform_get_regulator(hpriv, port, 470 &port_dev->dev); 471 if (rc == -EPROBE_DEFER) 472 goto err_out; 473 } 474 #endif 475 476 rc = ahci_platform_get_phy(hpriv, port, dev, child); 477 if (rc) 478 goto err_out; 479 480 enabled_ports++; 481 } 482 if (!enabled_ports) { 483 dev_warn(dev, "No port enabled\n"); 484 rc = -ENODEV; 485 goto err_out; 486 } 487 488 if (!hpriv->mask_port_map) 489 hpriv->mask_port_map = mask_port_map; 490 } else { 491 /* 492 * If no sub-node was found, keep this for device tree 493 * compatibility 494 */ 495 rc = ahci_platform_get_phy(hpriv, 0, dev, dev->of_node); 496 if (rc) 497 goto err_out; 498 499 rc = ahci_platform_get_regulator(hpriv, 0, dev); 500 if (rc == -EPROBE_DEFER) 501 goto err_out; 502 } 503 pm_runtime_enable(dev); 504 pm_runtime_get_sync(dev); 505 hpriv->got_runtime_pm = true; 506 507 devres_remove_group(dev, NULL); 508 return hpriv; 509 510 err_out: 511 devres_release_group(dev, NULL); 512 return ERR_PTR(rc); 513 } 514 EXPORT_SYMBOL_GPL(ahci_platform_get_resources); 515 516 /** 517 * ahci_platform_init_host - Bring up an ahci-platform host 518 * @pdev: platform device pointer for the host 519 * @hpriv: ahci-host private data for the host 520 * @pi_template: template for the ata_port_info to use 521 * @sht: scsi_host_template to use when registering 522 * 523 * This function does all the usual steps needed to bring up an 524 * ahci-platform host, note any necessary resources (ie clks, phys, etc.) 525 * must be initialized / enabled before calling this. 526 * 527 * RETURNS: 528 * 0 on success otherwise a negative error code 529 */ 530 int ahci_platform_init_host(struct platform_device *pdev, 531 struct ahci_host_priv *hpriv, 532 const struct ata_port_info *pi_template, 533 struct scsi_host_template *sht) 534 { 535 struct device *dev = &pdev->dev; 536 struct ata_port_info pi = *pi_template; 537 const struct ata_port_info *ppi[] = { &pi, NULL }; 538 struct ata_host *host; 539 int i, irq, n_ports, rc; 540 541 irq = platform_get_irq(pdev, 0); 542 if (irq <= 0) { 543 if (irq != -EPROBE_DEFER) 544 dev_err(dev, "no irq\n"); 545 return irq; 546 } 547 548 hpriv->irq = irq; 549 550 /* prepare host */ 551 pi.private_data = (void *)(unsigned long)hpriv->flags; 552 553 ahci_save_initial_config(dev, hpriv); 554 555 if (hpriv->cap & HOST_CAP_NCQ) 556 pi.flags |= ATA_FLAG_NCQ; 557 558 if (hpriv->cap & HOST_CAP_PMP) 559 pi.flags |= ATA_FLAG_PMP; 560 561 ahci_set_em_messages(hpriv, &pi); 562 563 /* CAP.NP sometimes indicate the index of the last enabled 564 * port, at other times, that of the last possible port, so 565 * determining the maximum port number requires looking at 566 * both CAP.NP and port_map. 567 */ 568 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map)); 569 570 host = ata_host_alloc_pinfo(dev, ppi, n_ports); 571 if (!host) 572 return -ENOMEM; 573 574 host->private_data = hpriv; 575 576 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss) 577 host->flags |= ATA_HOST_PARALLEL_SCAN; 578 else 579 dev_info(dev, "SSS flag set, parallel bus scan disabled\n"); 580 581 if (pi.flags & ATA_FLAG_EM) 582 ahci_reset_em(host); 583 584 for (i = 0; i < host->n_ports; i++) { 585 struct ata_port *ap = host->ports[i]; 586 587 ata_port_desc(ap, "mmio %pR", 588 platform_get_resource(pdev, IORESOURCE_MEM, 0)); 589 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80); 590 591 /* set enclosure management message type */ 592 if (ap->flags & ATA_FLAG_EM) 593 ap->em_message_type = hpriv->em_msg_type; 594 595 /* disabled/not-implemented port */ 596 if (!(hpriv->port_map & (1 << i))) 597 ap->ops = &ata_dummy_port_ops; 598 } 599 600 if (hpriv->cap & HOST_CAP_64) { 601 rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64)); 602 if (rc) { 603 rc = dma_coerce_mask_and_coherent(dev, 604 DMA_BIT_MASK(32)); 605 if (rc) { 606 dev_err(dev, "Failed to enable 64-bit DMA.\n"); 607 return rc; 608 } 609 dev_warn(dev, "Enable 32-bit DMA instead of 64-bit.\n"); 610 } 611 } 612 613 rc = ahci_reset_controller(host); 614 if (rc) 615 return rc; 616 617 ahci_init_controller(host); 618 ahci_print_info(host, "platform"); 619 620 return ahci_host_activate(host, sht); 621 } 622 EXPORT_SYMBOL_GPL(ahci_platform_init_host); 623 624 static void ahci_host_stop(struct ata_host *host) 625 { 626 struct ahci_host_priv *hpriv = host->private_data; 627 628 ahci_platform_disable_resources(hpriv); 629 } 630 631 /** 632 * ahci_platform_shutdown - Disable interrupts and stop DMA for host ports 633 * @pdev: platform device pointer for the host 634 * 635 * This function is called during system shutdown and performs the minimal 636 * deconfiguration required to ensure that an ahci_platform host cannot 637 * corrupt or otherwise interfere with a new kernel being started with kexec. 638 */ 639 void ahci_platform_shutdown(struct platform_device *pdev) 640 { 641 struct ata_host *host = platform_get_drvdata(pdev); 642 struct ahci_host_priv *hpriv = host->private_data; 643 void __iomem *mmio = hpriv->mmio; 644 int i; 645 646 for (i = 0; i < host->n_ports; i++) { 647 struct ata_port *ap = host->ports[i]; 648 649 /* Disable port interrupts */ 650 if (ap->ops->freeze) 651 ap->ops->freeze(ap); 652 653 /* Stop the port DMA engines */ 654 if (ap->ops->port_stop) 655 ap->ops->port_stop(ap); 656 } 657 658 /* Disable and clear host interrupts */ 659 writel(readl(mmio + HOST_CTL) & ~HOST_IRQ_EN, mmio + HOST_CTL); 660 readl(mmio + HOST_CTL); /* flush */ 661 writel(GENMASK(host->n_ports, 0), mmio + HOST_IRQ_STAT); 662 } 663 EXPORT_SYMBOL_GPL(ahci_platform_shutdown); 664 665 #ifdef CONFIG_PM_SLEEP 666 /** 667 * ahci_platform_suspend_host - Suspend an ahci-platform host 668 * @dev: device pointer for the host 669 * 670 * This function does all the usual steps needed to suspend an 671 * ahci-platform host, note any necessary resources (ie clks, phys, etc.) 672 * must be disabled after calling this. 673 * 674 * RETURNS: 675 * 0 on success otherwise a negative error code 676 */ 677 int ahci_platform_suspend_host(struct device *dev) 678 { 679 struct ata_host *host = dev_get_drvdata(dev); 680 struct ahci_host_priv *hpriv = host->private_data; 681 void __iomem *mmio = hpriv->mmio; 682 u32 ctl; 683 684 if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) { 685 dev_err(dev, "firmware update required for suspend/resume\n"); 686 return -EIO; 687 } 688 689 /* 690 * AHCI spec rev1.1 section 8.3.3: 691 * Software must disable interrupts prior to requesting a 692 * transition of the HBA to D3 state. 693 */ 694 ctl = readl(mmio + HOST_CTL); 695 ctl &= ~HOST_IRQ_EN; 696 writel(ctl, mmio + HOST_CTL); 697 readl(mmio + HOST_CTL); /* flush */ 698 699 return ata_host_suspend(host, PMSG_SUSPEND); 700 } 701 EXPORT_SYMBOL_GPL(ahci_platform_suspend_host); 702 703 /** 704 * ahci_platform_resume_host - Resume an ahci-platform host 705 * @dev: device pointer for the host 706 * 707 * This function does all the usual steps needed to resume an ahci-platform 708 * host, note any necessary resources (ie clks, phys, etc.) must be 709 * initialized / enabled before calling this. 710 * 711 * RETURNS: 712 * 0 on success otherwise a negative error code 713 */ 714 int ahci_platform_resume_host(struct device *dev) 715 { 716 struct ata_host *host = dev_get_drvdata(dev); 717 int rc; 718 719 if (dev->power.power_state.event == PM_EVENT_SUSPEND) { 720 rc = ahci_reset_controller(host); 721 if (rc) 722 return rc; 723 724 ahci_init_controller(host); 725 } 726 727 ata_host_resume(host); 728 729 return 0; 730 } 731 EXPORT_SYMBOL_GPL(ahci_platform_resume_host); 732 733 /** 734 * ahci_platform_suspend - Suspend an ahci-platform device 735 * @dev: the platform device to suspend 736 * 737 * This function suspends the host associated with the device, followed by 738 * disabling all the resources of the device. 739 * 740 * RETURNS: 741 * 0 on success otherwise a negative error code 742 */ 743 int ahci_platform_suspend(struct device *dev) 744 { 745 struct ata_host *host = dev_get_drvdata(dev); 746 struct ahci_host_priv *hpriv = host->private_data; 747 int rc; 748 749 rc = ahci_platform_suspend_host(dev); 750 if (rc) 751 return rc; 752 753 ahci_platform_disable_resources(hpriv); 754 755 return 0; 756 } 757 EXPORT_SYMBOL_GPL(ahci_platform_suspend); 758 759 /** 760 * ahci_platform_resume - Resume an ahci-platform device 761 * @dev: the platform device to resume 762 * 763 * This function enables all the resources of the device followed by 764 * resuming the host associated with the device. 765 * 766 * RETURNS: 767 * 0 on success otherwise a negative error code 768 */ 769 int ahci_platform_resume(struct device *dev) 770 { 771 struct ata_host *host = dev_get_drvdata(dev); 772 struct ahci_host_priv *hpriv = host->private_data; 773 int rc; 774 775 rc = ahci_platform_enable_resources(hpriv); 776 if (rc) 777 return rc; 778 779 rc = ahci_platform_resume_host(dev); 780 if (rc) 781 goto disable_resources; 782 783 /* We resumed so update PM runtime state */ 784 pm_runtime_disable(dev); 785 pm_runtime_set_active(dev); 786 pm_runtime_enable(dev); 787 788 return 0; 789 790 disable_resources: 791 ahci_platform_disable_resources(hpriv); 792 793 return rc; 794 } 795 EXPORT_SYMBOL_GPL(ahci_platform_resume); 796 #endif 797 798 MODULE_DESCRIPTION("AHCI SATA platform library"); 799 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); 800 MODULE_LICENSE("GPL"); 801