1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * AHCI SATA platform library 4 * 5 * Copyright 2004-2005 Red Hat, Inc. 6 * Jeff Garzik <jgarzik@pobox.com> 7 * Copyright 2010 MontaVista Software, LLC. 8 * Anton Vorontsov <avorontsov@ru.mvista.com> 9 */ 10 11 #include <linux/clk.h> 12 #include <linux/kernel.h> 13 #include <linux/gfp.h> 14 #include <linux/module.h> 15 #include <linux/pm.h> 16 #include <linux/interrupt.h> 17 #include <linux/device.h> 18 #include <linux/platform_device.h> 19 #include <linux/libata.h> 20 #include <linux/ahci_platform.h> 21 #include <linux/phy/phy.h> 22 #include <linux/pm_runtime.h> 23 #include <linux/of_platform.h> 24 #include <linux/reset.h> 25 #include "ahci.h" 26 27 static void ahci_host_stop(struct ata_host *host); 28 29 struct ata_port_operations ahci_platform_ops = { 30 .inherits = &ahci_ops, 31 .host_stop = ahci_host_stop, 32 }; 33 EXPORT_SYMBOL_GPL(ahci_platform_ops); 34 35 /** 36 * ahci_platform_enable_phys - Enable PHYs 37 * @hpriv: host private area to store config values 38 * 39 * This function enables all the PHYs found in hpriv->phys, if any. 40 * If a PHY fails to be enabled, it disables all the PHYs already 41 * enabled in reverse order and returns an error. 42 * 43 * RETURNS: 44 * 0 on success otherwise a negative error code 45 */ 46 static int ahci_platform_enable_phys(struct ahci_host_priv *hpriv) 47 { 48 int rc, i; 49 50 for (i = 0; i < hpriv->nports; i++) { 51 rc = phy_init(hpriv->phys[i]); 52 if (rc) 53 goto disable_phys; 54 55 rc = phy_set_mode(hpriv->phys[i], PHY_MODE_SATA); 56 if (rc) { 57 phy_exit(hpriv->phys[i]); 58 goto disable_phys; 59 } 60 61 rc = phy_power_on(hpriv->phys[i]); 62 if (rc) { 63 phy_exit(hpriv->phys[i]); 64 goto disable_phys; 65 } 66 } 67 68 return 0; 69 70 disable_phys: 71 while (--i >= 0) { 72 phy_power_off(hpriv->phys[i]); 73 phy_exit(hpriv->phys[i]); 74 } 75 return rc; 76 } 77 78 /** 79 * ahci_platform_disable_phys - Disable PHYs 80 * @hpriv: host private area to store config values 81 * 82 * This function disables all PHYs found in hpriv->phys. 83 */ 84 static void ahci_platform_disable_phys(struct ahci_host_priv *hpriv) 85 { 86 int i; 87 88 for (i = 0; i < hpriv->nports; i++) { 89 phy_power_off(hpriv->phys[i]); 90 phy_exit(hpriv->phys[i]); 91 } 92 } 93 94 /** 95 * ahci_platform_enable_clks - Enable platform clocks 96 * @hpriv: host private area to store config values 97 * 98 * This function enables all the clks found in hpriv->clks, starting at 99 * index 0. If any clk fails to enable it disables all the clks already 100 * enabled in reverse order, and then returns an error. 101 * 102 * RETURNS: 103 * 0 on success otherwise a negative error code 104 */ 105 int ahci_platform_enable_clks(struct ahci_host_priv *hpriv) 106 { 107 int c, rc; 108 109 for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) { 110 rc = clk_prepare_enable(hpriv->clks[c]); 111 if (rc) 112 goto disable_unprepare_clk; 113 } 114 return 0; 115 116 disable_unprepare_clk: 117 while (--c >= 0) 118 clk_disable_unprepare(hpriv->clks[c]); 119 return rc; 120 } 121 EXPORT_SYMBOL_GPL(ahci_platform_enable_clks); 122 123 /** 124 * ahci_platform_disable_clks - Disable platform clocks 125 * @hpriv: host private area to store config values 126 * 127 * This function disables all the clks found in hpriv->clks, in reverse 128 * order of ahci_platform_enable_clks (starting at the end of the array). 129 */ 130 void ahci_platform_disable_clks(struct ahci_host_priv *hpriv) 131 { 132 int c; 133 134 for (c = AHCI_MAX_CLKS - 1; c >= 0; c--) 135 if (hpriv->clks[c]) 136 clk_disable_unprepare(hpriv->clks[c]); 137 } 138 EXPORT_SYMBOL_GPL(ahci_platform_disable_clks); 139 140 /** 141 * ahci_platform_enable_regulators - Enable regulators 142 * @hpriv: host private area to store config values 143 * 144 * This function enables all the regulators found in controller and 145 * hpriv->target_pwrs, if any. If a regulator fails to be enabled, it 146 * disables all the regulators already enabled in reverse order and 147 * returns an error. 148 * 149 * RETURNS: 150 * 0 on success otherwise a negative error code 151 */ 152 int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv) 153 { 154 int rc, i; 155 156 if (hpriv->ahci_regulator) { 157 rc = regulator_enable(hpriv->ahci_regulator); 158 if (rc) 159 return rc; 160 } 161 162 if (hpriv->phy_regulator) { 163 rc = regulator_enable(hpriv->phy_regulator); 164 if (rc) 165 goto disable_ahci_pwrs; 166 } 167 168 for (i = 0; i < hpriv->nports; i++) { 169 if (!hpriv->target_pwrs[i]) 170 continue; 171 172 rc = regulator_enable(hpriv->target_pwrs[i]); 173 if (rc) 174 goto disable_target_pwrs; 175 } 176 177 return 0; 178 179 disable_target_pwrs: 180 while (--i >= 0) 181 if (hpriv->target_pwrs[i]) 182 regulator_disable(hpriv->target_pwrs[i]); 183 184 if (hpriv->phy_regulator) 185 regulator_disable(hpriv->phy_regulator); 186 disable_ahci_pwrs: 187 if (hpriv->ahci_regulator) 188 regulator_disable(hpriv->ahci_regulator); 189 return rc; 190 } 191 EXPORT_SYMBOL_GPL(ahci_platform_enable_regulators); 192 193 /** 194 * ahci_platform_disable_regulators - Disable regulators 195 * @hpriv: host private area to store config values 196 * 197 * This function disables all regulators found in hpriv->target_pwrs and 198 * AHCI controller. 199 */ 200 void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv) 201 { 202 int i; 203 204 for (i = 0; i < hpriv->nports; i++) { 205 if (!hpriv->target_pwrs[i]) 206 continue; 207 regulator_disable(hpriv->target_pwrs[i]); 208 } 209 210 if (hpriv->ahci_regulator) 211 regulator_disable(hpriv->ahci_regulator); 212 if (hpriv->phy_regulator) 213 regulator_disable(hpriv->phy_regulator); 214 } 215 EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators); 216 /** 217 * ahci_platform_enable_resources - Enable platform resources 218 * @hpriv: host private area to store config values 219 * 220 * This function enables all ahci_platform managed resources in the 221 * following order: 222 * 1) Regulator 223 * 2) Clocks (through ahci_platform_enable_clks) 224 * 3) Resets 225 * 4) Phys 226 * 227 * If resource enabling fails at any point the previous enabled resources 228 * are disabled in reverse order. 229 * 230 * RETURNS: 231 * 0 on success otherwise a negative error code 232 */ 233 int ahci_platform_enable_resources(struct ahci_host_priv *hpriv) 234 { 235 int rc; 236 237 rc = ahci_platform_enable_regulators(hpriv); 238 if (rc) 239 return rc; 240 241 rc = ahci_platform_enable_clks(hpriv); 242 if (rc) 243 goto disable_regulator; 244 245 rc = reset_control_deassert(hpriv->rsts); 246 if (rc) 247 goto disable_clks; 248 249 rc = ahci_platform_enable_phys(hpriv); 250 if (rc) 251 goto disable_resets; 252 253 return 0; 254 255 disable_resets: 256 reset_control_assert(hpriv->rsts); 257 258 disable_clks: 259 ahci_platform_disable_clks(hpriv); 260 261 disable_regulator: 262 ahci_platform_disable_regulators(hpriv); 263 264 return rc; 265 } 266 EXPORT_SYMBOL_GPL(ahci_platform_enable_resources); 267 268 /** 269 * ahci_platform_disable_resources - Disable platform resources 270 * @hpriv: host private area to store config values 271 * 272 * This function disables all ahci_platform managed resources in the 273 * following order: 274 * 1) Phys 275 * 2) Resets 276 * 3) Clocks (through ahci_platform_disable_clks) 277 * 4) Regulator 278 */ 279 void ahci_platform_disable_resources(struct ahci_host_priv *hpriv) 280 { 281 ahci_platform_disable_phys(hpriv); 282 283 reset_control_assert(hpriv->rsts); 284 285 ahci_platform_disable_clks(hpriv); 286 287 ahci_platform_disable_regulators(hpriv); 288 } 289 EXPORT_SYMBOL_GPL(ahci_platform_disable_resources); 290 291 static void ahci_platform_put_resources(struct device *dev, void *res) 292 { 293 struct ahci_host_priv *hpriv = res; 294 int c; 295 296 if (hpriv->got_runtime_pm) { 297 pm_runtime_put_sync(dev); 298 pm_runtime_disable(dev); 299 } 300 301 for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) 302 clk_put(hpriv->clks[c]); 303 /* 304 * The regulators are tied to child node device and not to the 305 * SATA device itself. So we can't use devm for automatically 306 * releasing them. We have to do it manually here. 307 */ 308 for (c = 0; c < hpriv->nports; c++) 309 if (hpriv->target_pwrs && hpriv->target_pwrs[c]) 310 regulator_put(hpriv->target_pwrs[c]); 311 312 kfree(hpriv->target_pwrs); 313 } 314 315 static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port, 316 struct device *dev, struct device_node *node) 317 { 318 int rc; 319 320 hpriv->phys[port] = devm_of_phy_get(dev, node, NULL); 321 322 if (!IS_ERR(hpriv->phys[port])) 323 return 0; 324 325 rc = PTR_ERR(hpriv->phys[port]); 326 switch (rc) { 327 case -ENOSYS: 328 /* No PHY support. Check if PHY is required. */ 329 if (of_find_property(node, "phys", NULL)) { 330 dev_err(dev, 331 "couldn't get PHY in node %pOFn: ENOSYS\n", 332 node); 333 break; 334 } 335 /* fall through */ 336 case -ENODEV: 337 /* continue normally */ 338 hpriv->phys[port] = NULL; 339 rc = 0; 340 break; 341 case -EPROBE_DEFER: 342 /* Do not complain yet */ 343 break; 344 345 default: 346 dev_err(dev, 347 "couldn't get PHY in node %pOFn: %d\n", 348 node, rc); 349 350 break; 351 } 352 353 return rc; 354 } 355 356 static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port, 357 struct device *dev) 358 { 359 struct regulator *target_pwr; 360 int rc = 0; 361 362 target_pwr = regulator_get_optional(dev, "target"); 363 364 if (!IS_ERR(target_pwr)) 365 hpriv->target_pwrs[port] = target_pwr; 366 else 367 rc = PTR_ERR(target_pwr); 368 369 return rc; 370 } 371 372 /** 373 * ahci_platform_get_resources - Get platform resources 374 * @pdev: platform device to get resources for 375 * @flags: bitmap representing the resource to get 376 * 377 * This function allocates an ahci_host_priv struct, and gets the following 378 * resources, storing a reference to them inside the returned struct: 379 * 380 * 1) mmio registers (IORESOURCE_MEM 0, mandatory) 381 * 2) regulator for controlling the targets power (optional) 382 * regulator for controlling the AHCI controller (optional) 383 * 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node, 384 * or for non devicetree enabled platforms a single clock 385 * 4) resets, if flags has AHCI_PLATFORM_GET_RESETS (optional) 386 * 5) phys (optional) 387 * 388 * RETURNS: 389 * The allocated ahci_host_priv on success, otherwise an ERR_PTR value 390 */ 391 struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev, 392 unsigned int flags) 393 { 394 struct device *dev = &pdev->dev; 395 struct ahci_host_priv *hpriv; 396 struct clk *clk; 397 struct device_node *child; 398 int i, enabled_ports = 0, rc = -ENOMEM, child_nodes; 399 u32 mask_port_map = 0; 400 401 if (!devres_open_group(dev, NULL, GFP_KERNEL)) 402 return ERR_PTR(-ENOMEM); 403 404 hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv), 405 GFP_KERNEL); 406 if (!hpriv) 407 goto err_out; 408 409 devres_add(dev, hpriv); 410 411 hpriv->mmio = devm_ioremap_resource(dev, 412 platform_get_resource(pdev, IORESOURCE_MEM, 0)); 413 if (IS_ERR(hpriv->mmio)) { 414 rc = PTR_ERR(hpriv->mmio); 415 goto err_out; 416 } 417 418 for (i = 0; i < AHCI_MAX_CLKS; i++) { 419 /* 420 * For now we must use clk_get(dev, NULL) for the first clock, 421 * because some platforms (da850, spear13xx) are not yet 422 * converted to use devicetree for clocks. For new platforms 423 * this is equivalent to of_clk_get(dev->of_node, 0). 424 */ 425 if (i == 0) 426 clk = clk_get(dev, NULL); 427 else 428 clk = of_clk_get(dev->of_node, i); 429 430 if (IS_ERR(clk)) { 431 rc = PTR_ERR(clk); 432 if (rc == -EPROBE_DEFER) 433 goto err_out; 434 break; 435 } 436 hpriv->clks[i] = clk; 437 } 438 439 hpriv->ahci_regulator = devm_regulator_get_optional(dev, "ahci"); 440 if (IS_ERR(hpriv->ahci_regulator)) { 441 rc = PTR_ERR(hpriv->ahci_regulator); 442 if (rc == -EPROBE_DEFER) 443 goto err_out; 444 rc = 0; 445 hpriv->ahci_regulator = NULL; 446 } 447 448 hpriv->phy_regulator = devm_regulator_get_optional(dev, "phy"); 449 if (IS_ERR(hpriv->phy_regulator)) { 450 rc = PTR_ERR(hpriv->phy_regulator); 451 if (rc == -EPROBE_DEFER) 452 goto err_out; 453 rc = 0; 454 hpriv->phy_regulator = NULL; 455 } 456 457 if (flags & AHCI_PLATFORM_GET_RESETS) { 458 hpriv->rsts = devm_reset_control_array_get_optional_shared(dev); 459 if (IS_ERR(hpriv->rsts)) { 460 rc = PTR_ERR(hpriv->rsts); 461 goto err_out; 462 } 463 } 464 465 hpriv->nports = child_nodes = of_get_child_count(dev->of_node); 466 467 /* 468 * If no sub-node was found, we still need to set nports to 469 * one in order to be able to use the 470 * ahci_platform_[en|dis]able_[phys|regulators] functions. 471 */ 472 if (!child_nodes) 473 hpriv->nports = 1; 474 475 hpriv->phys = devm_kcalloc(dev, hpriv->nports, sizeof(*hpriv->phys), GFP_KERNEL); 476 if (!hpriv->phys) { 477 rc = -ENOMEM; 478 goto err_out; 479 } 480 /* 481 * We cannot use devm_ here, since ahci_platform_put_resources() uses 482 * target_pwrs after devm_ have freed memory 483 */ 484 hpriv->target_pwrs = kcalloc(hpriv->nports, sizeof(*hpriv->target_pwrs), GFP_KERNEL); 485 if (!hpriv->target_pwrs) { 486 rc = -ENOMEM; 487 goto err_out; 488 } 489 490 if (child_nodes) { 491 for_each_child_of_node(dev->of_node, child) { 492 u32 port; 493 struct platform_device *port_dev __maybe_unused; 494 495 if (!of_device_is_available(child)) 496 continue; 497 498 if (of_property_read_u32(child, "reg", &port)) { 499 rc = -EINVAL; 500 goto err_out; 501 } 502 503 if (port >= hpriv->nports) { 504 dev_warn(dev, "invalid port number %d\n", port); 505 continue; 506 } 507 mask_port_map |= BIT(port); 508 509 #ifdef CONFIG_OF_ADDRESS 510 of_platform_device_create(child, NULL, NULL); 511 512 port_dev = of_find_device_by_node(child); 513 514 if (port_dev) { 515 rc = ahci_platform_get_regulator(hpriv, port, 516 &port_dev->dev); 517 if (rc == -EPROBE_DEFER) 518 goto err_out; 519 } 520 #endif 521 522 rc = ahci_platform_get_phy(hpriv, port, dev, child); 523 if (rc) 524 goto err_out; 525 526 enabled_ports++; 527 } 528 if (!enabled_ports) { 529 dev_warn(dev, "No port enabled\n"); 530 rc = -ENODEV; 531 goto err_out; 532 } 533 534 if (!hpriv->mask_port_map) 535 hpriv->mask_port_map = mask_port_map; 536 } else { 537 /* 538 * If no sub-node was found, keep this for device tree 539 * compatibility 540 */ 541 rc = ahci_platform_get_phy(hpriv, 0, dev, dev->of_node); 542 if (rc) 543 goto err_out; 544 545 rc = ahci_platform_get_regulator(hpriv, 0, dev); 546 if (rc == -EPROBE_DEFER) 547 goto err_out; 548 } 549 pm_runtime_enable(dev); 550 pm_runtime_get_sync(dev); 551 hpriv->got_runtime_pm = true; 552 553 devres_remove_group(dev, NULL); 554 return hpriv; 555 556 err_out: 557 devres_release_group(dev, NULL); 558 return ERR_PTR(rc); 559 } 560 EXPORT_SYMBOL_GPL(ahci_platform_get_resources); 561 562 /** 563 * ahci_platform_init_host - Bring up an ahci-platform host 564 * @pdev: platform device pointer for the host 565 * @hpriv: ahci-host private data for the host 566 * @pi_template: template for the ata_port_info to use 567 * @sht: scsi_host_template to use when registering 568 * 569 * This function does all the usual steps needed to bring up an 570 * ahci-platform host, note any necessary resources (ie clks, phys, etc.) 571 * must be initialized / enabled before calling this. 572 * 573 * RETURNS: 574 * 0 on success otherwise a negative error code 575 */ 576 int ahci_platform_init_host(struct platform_device *pdev, 577 struct ahci_host_priv *hpriv, 578 const struct ata_port_info *pi_template, 579 struct scsi_host_template *sht) 580 { 581 struct device *dev = &pdev->dev; 582 struct ata_port_info pi = *pi_template; 583 const struct ata_port_info *ppi[] = { &pi, NULL }; 584 struct ata_host *host; 585 int i, irq, n_ports, rc; 586 587 irq = platform_get_irq(pdev, 0); 588 if (irq <= 0) { 589 if (irq != -EPROBE_DEFER) 590 dev_err(dev, "no irq\n"); 591 return irq; 592 } 593 594 hpriv->irq = irq; 595 596 /* prepare host */ 597 pi.private_data = (void *)(unsigned long)hpriv->flags; 598 599 ahci_save_initial_config(dev, hpriv); 600 601 if (hpriv->cap & HOST_CAP_NCQ) 602 pi.flags |= ATA_FLAG_NCQ; 603 604 if (hpriv->cap & HOST_CAP_PMP) 605 pi.flags |= ATA_FLAG_PMP; 606 607 ahci_set_em_messages(hpriv, &pi); 608 609 /* CAP.NP sometimes indicate the index of the last enabled 610 * port, at other times, that of the last possible port, so 611 * determining the maximum port number requires looking at 612 * both CAP.NP and port_map. 613 */ 614 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map)); 615 616 host = ata_host_alloc_pinfo(dev, ppi, n_ports); 617 if (!host) 618 return -ENOMEM; 619 620 host->private_data = hpriv; 621 622 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss) 623 host->flags |= ATA_HOST_PARALLEL_SCAN; 624 else 625 dev_info(dev, "SSS flag set, parallel bus scan disabled\n"); 626 627 if (pi.flags & ATA_FLAG_EM) 628 ahci_reset_em(host); 629 630 for (i = 0; i < host->n_ports; i++) { 631 struct ata_port *ap = host->ports[i]; 632 633 ata_port_desc(ap, "mmio %pR", 634 platform_get_resource(pdev, IORESOURCE_MEM, 0)); 635 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80); 636 637 /* set enclosure management message type */ 638 if (ap->flags & ATA_FLAG_EM) 639 ap->em_message_type = hpriv->em_msg_type; 640 641 /* disabled/not-implemented port */ 642 if (!(hpriv->port_map & (1 << i))) 643 ap->ops = &ata_dummy_port_ops; 644 } 645 646 if (hpriv->cap & HOST_CAP_64) { 647 rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64)); 648 if (rc) { 649 rc = dma_coerce_mask_and_coherent(dev, 650 DMA_BIT_MASK(32)); 651 if (rc) { 652 dev_err(dev, "Failed to enable 64-bit DMA.\n"); 653 return rc; 654 } 655 dev_warn(dev, "Enable 32-bit DMA instead of 64-bit.\n"); 656 } 657 } 658 659 rc = ahci_reset_controller(host); 660 if (rc) 661 return rc; 662 663 ahci_init_controller(host); 664 ahci_print_info(host, "platform"); 665 666 return ahci_host_activate(host, sht); 667 } 668 EXPORT_SYMBOL_GPL(ahci_platform_init_host); 669 670 static void ahci_host_stop(struct ata_host *host) 671 { 672 struct ahci_host_priv *hpriv = host->private_data; 673 674 ahci_platform_disable_resources(hpriv); 675 } 676 677 /** 678 * ahci_platform_shutdown - Disable interrupts and stop DMA for host ports 679 * @pdev: platform device pointer for the host 680 * 681 * This function is called during system shutdown and performs the minimal 682 * deconfiguration required to ensure that an ahci_platform host cannot 683 * corrupt or otherwise interfere with a new kernel being started with kexec. 684 */ 685 void ahci_platform_shutdown(struct platform_device *pdev) 686 { 687 struct ata_host *host = platform_get_drvdata(pdev); 688 struct ahci_host_priv *hpriv = host->private_data; 689 void __iomem *mmio = hpriv->mmio; 690 int i; 691 692 for (i = 0; i < host->n_ports; i++) { 693 struct ata_port *ap = host->ports[i]; 694 695 /* Disable port interrupts */ 696 if (ap->ops->freeze) 697 ap->ops->freeze(ap); 698 699 /* Stop the port DMA engines */ 700 if (ap->ops->port_stop) 701 ap->ops->port_stop(ap); 702 } 703 704 /* Disable and clear host interrupts */ 705 writel(readl(mmio + HOST_CTL) & ~HOST_IRQ_EN, mmio + HOST_CTL); 706 readl(mmio + HOST_CTL); /* flush */ 707 writel(GENMASK(host->n_ports, 0), mmio + HOST_IRQ_STAT); 708 } 709 EXPORT_SYMBOL_GPL(ahci_platform_shutdown); 710 711 #ifdef CONFIG_PM_SLEEP 712 /** 713 * ahci_platform_suspend_host - Suspend an ahci-platform host 714 * @dev: device pointer for the host 715 * 716 * This function does all the usual steps needed to suspend an 717 * ahci-platform host, note any necessary resources (ie clks, phys, etc.) 718 * must be disabled after calling this. 719 * 720 * RETURNS: 721 * 0 on success otherwise a negative error code 722 */ 723 int ahci_platform_suspend_host(struct device *dev) 724 { 725 struct ata_host *host = dev_get_drvdata(dev); 726 struct ahci_host_priv *hpriv = host->private_data; 727 void __iomem *mmio = hpriv->mmio; 728 u32 ctl; 729 730 if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) { 731 dev_err(dev, "firmware update required for suspend/resume\n"); 732 return -EIO; 733 } 734 735 /* 736 * AHCI spec rev1.1 section 8.3.3: 737 * Software must disable interrupts prior to requesting a 738 * transition of the HBA to D3 state. 739 */ 740 ctl = readl(mmio + HOST_CTL); 741 ctl &= ~HOST_IRQ_EN; 742 writel(ctl, mmio + HOST_CTL); 743 readl(mmio + HOST_CTL); /* flush */ 744 745 if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS) 746 ahci_platform_disable_phys(hpriv); 747 748 return ata_host_suspend(host, PMSG_SUSPEND); 749 } 750 EXPORT_SYMBOL_GPL(ahci_platform_suspend_host); 751 752 /** 753 * ahci_platform_resume_host - Resume an ahci-platform host 754 * @dev: device pointer for the host 755 * 756 * This function does all the usual steps needed to resume an ahci-platform 757 * host, note any necessary resources (ie clks, phys, etc.) must be 758 * initialized / enabled before calling this. 759 * 760 * RETURNS: 761 * 0 on success otherwise a negative error code 762 */ 763 int ahci_platform_resume_host(struct device *dev) 764 { 765 struct ata_host *host = dev_get_drvdata(dev); 766 struct ahci_host_priv *hpriv = host->private_data; 767 int rc; 768 769 if (dev->power.power_state.event == PM_EVENT_SUSPEND) { 770 rc = ahci_reset_controller(host); 771 if (rc) 772 return rc; 773 774 ahci_init_controller(host); 775 } 776 777 if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS) 778 ahci_platform_enable_phys(hpriv); 779 780 ata_host_resume(host); 781 782 return 0; 783 } 784 EXPORT_SYMBOL_GPL(ahci_platform_resume_host); 785 786 /** 787 * ahci_platform_suspend - Suspend an ahci-platform device 788 * @dev: the platform device to suspend 789 * 790 * This function suspends the host associated with the device, followed by 791 * disabling all the resources of the device. 792 * 793 * RETURNS: 794 * 0 on success otherwise a negative error code 795 */ 796 int ahci_platform_suspend(struct device *dev) 797 { 798 struct ata_host *host = dev_get_drvdata(dev); 799 struct ahci_host_priv *hpriv = host->private_data; 800 int rc; 801 802 rc = ahci_platform_suspend_host(dev); 803 if (rc) 804 return rc; 805 806 ahci_platform_disable_resources(hpriv); 807 808 return 0; 809 } 810 EXPORT_SYMBOL_GPL(ahci_platform_suspend); 811 812 /** 813 * ahci_platform_resume - Resume an ahci-platform device 814 * @dev: the platform device to resume 815 * 816 * This function enables all the resources of the device followed by 817 * resuming the host associated with the device. 818 * 819 * RETURNS: 820 * 0 on success otherwise a negative error code 821 */ 822 int ahci_platform_resume(struct device *dev) 823 { 824 struct ata_host *host = dev_get_drvdata(dev); 825 struct ahci_host_priv *hpriv = host->private_data; 826 int rc; 827 828 rc = ahci_platform_enable_resources(hpriv); 829 if (rc) 830 return rc; 831 832 rc = ahci_platform_resume_host(dev); 833 if (rc) 834 goto disable_resources; 835 836 /* We resumed so update PM runtime state */ 837 pm_runtime_disable(dev); 838 pm_runtime_set_active(dev); 839 pm_runtime_enable(dev); 840 841 return 0; 842 843 disable_resources: 844 ahci_platform_disable_resources(hpriv); 845 846 return rc; 847 } 848 EXPORT_SYMBOL_GPL(ahci_platform_resume); 849 #endif 850 851 MODULE_DESCRIPTION("AHCI SATA platform library"); 852 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); 853 MODULE_LICENSE("GPL"); 854