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 27static void ahci_host_stop(struct ata_host *host); 28 29struct ata_port_operations ahci_platform_ops = { 30 .inherits = &ahci_ops, 31 .host_stop = ahci_host_stop, 32}; 33EXPORT_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 */ 46int 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 && !(rc == -EOPNOTSUPP && (hpriv->flags & AHCI_HFLAG_IGN_NOTSUPP_POWER_ON))) { 63 phy_exit(hpriv->phys[i]); 64 goto disable_phys; 65 } 66 } 67 68 return 0; 69 70disable_phys: 71 while (--i >= 0) { 72 phy_power_off(hpriv->phys[i]); 73 phy_exit(hpriv->phys[i]); 74 } 75 return rc; 76} 77EXPORT_SYMBOL_GPL(ahci_platform_enable_phys); 78 79/** 80 * ahci_platform_disable_phys - Disable PHYs 81 * @hpriv: host private area to store config values 82 * 83 * This function disables all PHYs found in hpriv->phys. 84 */ 85void ahci_platform_disable_phys(struct ahci_host_priv *hpriv) 86{ 87 int i; 88 89 for (i = 0; i < hpriv->nports; i++) { 90 phy_power_off(hpriv->phys[i]); 91 phy_exit(hpriv->phys[i]); 92 } 93} 94EXPORT_SYMBOL_GPL(ahci_platform_disable_phys); 95 96/** 97 * ahci_platform_enable_clks - Enable platform clocks 98 * @hpriv: host private area to store config values 99 * 100 * This function enables all the clks found in hpriv->clks, starting at 101 * index 0. If any clk fails to enable it disables all the clks already 102 * enabled in reverse order, and then returns an error. 103 * 104 * RETURNS: 105 * 0 on success otherwise a negative error code 106 */ 107int ahci_platform_enable_clks(struct ahci_host_priv *hpriv) 108{ 109 int c, rc; 110 111 for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) { 112 rc = clk_prepare_enable(hpriv->clks[c]); 113 if (rc) 114 goto disable_unprepare_clk; 115 } 116 return 0; 117 118disable_unprepare_clk: 119 while (--c >= 0) 120 clk_disable_unprepare(hpriv->clks[c]); 121 return rc; 122} 123EXPORT_SYMBOL_GPL(ahci_platform_enable_clks); 124 125/** 126 * ahci_platform_disable_clks - Disable platform clocks 127 * @hpriv: host private area to store config values 128 * 129 * This function disables all the clks found in hpriv->clks, in reverse 130 * order of ahci_platform_enable_clks (starting at the end of the array). 131 */ 132void ahci_platform_disable_clks(struct ahci_host_priv *hpriv) 133{ 134 int c; 135 136 for (c = AHCI_MAX_CLKS - 1; c >= 0; c--) 137 if (hpriv->clks[c]) 138 clk_disable_unprepare(hpriv->clks[c]); 139} 140EXPORT_SYMBOL_GPL(ahci_platform_disable_clks); 141 142/** 143 * ahci_platform_enable_regulators - Enable regulators 144 * @hpriv: host private area to store config values 145 * 146 * This function enables all the regulators found in controller and 147 * hpriv->target_pwrs, if any. If a regulator fails to be enabled, it 148 * disables all the regulators already enabled in reverse order and 149 * returns an error. 150 * 151 * RETURNS: 152 * 0 on success otherwise a negative error code 153 */ 154int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv) 155{ 156 int rc, i; 157 158 rc = regulator_enable(hpriv->ahci_regulator); 159 if (rc) 160 return rc; 161 162 rc = regulator_enable(hpriv->phy_regulator); 163 if (rc) 164 goto disable_ahci_pwrs; 165 166 for (i = 0; i < hpriv->nports; i++) { 167 if (!hpriv->target_pwrs[i]) 168 continue; 169 170 rc = regulator_enable(hpriv->target_pwrs[i]); 171 if (rc) 172 goto disable_target_pwrs; 173 } 174 175 return 0; 176 177disable_target_pwrs: 178 while (--i >= 0) 179 if (hpriv->target_pwrs[i]) 180 regulator_disable(hpriv->target_pwrs[i]); 181 182 regulator_disable(hpriv->phy_regulator); 183disable_ahci_pwrs: 184 regulator_disable(hpriv->ahci_regulator); 185 return rc; 186} 187EXPORT_SYMBOL_GPL(ahci_platform_enable_regulators); 188 189/** 190 * ahci_platform_disable_regulators - Disable regulators 191 * @hpriv: host private area to store config values 192 * 193 * This function disables all regulators found in hpriv->target_pwrs and 194 * AHCI controller. 195 */ 196void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv) 197{ 198 int i; 199 200 for (i = 0; i < hpriv->nports; i++) { 201 if (!hpriv->target_pwrs[i]) 202 continue; 203 regulator_disable(hpriv->target_pwrs[i]); 204 } 205 206 regulator_disable(hpriv->ahci_regulator); 207 regulator_disable(hpriv->phy_regulator); 208} 209EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators); 210/** 211 * ahci_platform_enable_resources - Enable platform resources 212 * @hpriv: host private area to store config values 213 * 214 * This function enables all ahci_platform managed resources in the 215 * following order: 216 * 1) Regulator 217 * 2) Clocks (through ahci_platform_enable_clks) 218 * 3) Resets 219 * 4) Phys 220 * 221 * If resource enabling fails at any point the previous enabled resources 222 * are disabled in reverse order. 223 * 224 * RETURNS: 225 * 0 on success otherwise a negative error code 226 */ 227int ahci_platform_enable_resources(struct ahci_host_priv *hpriv) 228{ 229 int rc; 230 231 rc = ahci_platform_enable_regulators(hpriv); 232 if (rc) 233 return rc; 234 235 rc = ahci_platform_enable_clks(hpriv); 236 if (rc) 237 goto disable_regulator; 238 239 rc = reset_control_deassert(hpriv->rsts); 240 if (rc) 241 goto disable_clks; 242 243 rc = ahci_platform_enable_phys(hpriv); 244 if (rc) 245 goto disable_resets; 246 247 return 0; 248 249disable_resets: 250 reset_control_assert(hpriv->rsts); 251 252disable_clks: 253 ahci_platform_disable_clks(hpriv); 254 255disable_regulator: 256 ahci_platform_disable_regulators(hpriv); 257 258 return rc; 259} 260EXPORT_SYMBOL_GPL(ahci_platform_enable_resources); 261 262/** 263 * ahci_platform_disable_resources - Disable platform resources 264 * @hpriv: host private area to store config values 265 * 266 * This function disables all ahci_platform managed resources in the 267 * following order: 268 * 1) Phys 269 * 2) Resets 270 * 3) Clocks (through ahci_platform_disable_clks) 271 * 4) Regulator 272 */ 273void ahci_platform_disable_resources(struct ahci_host_priv *hpriv) 274{ 275 ahci_platform_disable_phys(hpriv); 276 277 reset_control_assert(hpriv->rsts); 278 279 ahci_platform_disable_clks(hpriv); 280 281 ahci_platform_disable_regulators(hpriv); 282} 283EXPORT_SYMBOL_GPL(ahci_platform_disable_resources); 284 285static void ahci_platform_put_resources(struct device *dev, void *res) 286{ 287 struct ahci_host_priv *hpriv = res; 288 int c; 289 290 if (hpriv->got_runtime_pm) { 291 pm_runtime_put_sync(dev); 292 pm_runtime_disable(dev); 293 } 294 295 for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) 296 clk_put(hpriv->clks[c]); 297 /* 298 * The regulators are tied to child node device and not to the 299 * SATA device itself. So we can't use devm for automatically 300 * releasing them. We have to do it manually here. 301 */ 302 for (c = 0; c < hpriv->nports; c++) 303 if (hpriv->target_pwrs && hpriv->target_pwrs[c]) 304 regulator_put(hpriv->target_pwrs[c]); 305 306 kfree(hpriv->target_pwrs); 307} 308 309static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port, 310 struct device *dev, struct device_node *node) 311{ 312 int rc; 313 314 hpriv->phys[port] = devm_of_phy_get(dev, node, NULL); 315 316 if (!IS_ERR(hpriv->phys[port])) 317 return 0; 318 319 rc = PTR_ERR(hpriv->phys[port]); 320 switch (rc) { 321 case -ENOSYS: 322 /* No PHY support. Check if PHY is required. */ 323 if (of_find_property(node, "phys", NULL)) { 324 dev_err(dev, 325 "couldn't get PHY in node %pOFn: ENOSYS\n", 326 node); 327 break; 328 } 329 fallthrough; 330 case -ENODEV: 331 /* continue normally */ 332 hpriv->phys[port] = NULL; 333 rc = 0; 334 break; 335 case -EPROBE_DEFER: 336 /* Do not complain yet */ 337 break; 338 339 default: 340 dev_err(dev, 341 "couldn't get PHY in node %pOFn: %d\n", 342 node, rc); 343 344 break; 345 } 346 347 return rc; 348} 349 350static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port, 351 struct device *dev) 352{ 353 struct regulator *target_pwr; 354 int rc = 0; 355 356 target_pwr = regulator_get(dev, "target"); 357 358 if (!IS_ERR(target_pwr)) 359 hpriv->target_pwrs[port] = target_pwr; 360 else 361 rc = PTR_ERR(target_pwr); 362 363 return rc; 364} 365 366/** 367 * ahci_platform_get_resources - Get platform resources 368 * @pdev: platform device to get resources for 369 * @flags: bitmap representing the resource to get 370 * 371 * This function allocates an ahci_host_priv struct, and gets the following 372 * resources, storing a reference to them inside the returned struct: 373 * 374 * 1) mmio registers (IORESOURCE_MEM 0, mandatory) 375 * 2) regulator for controlling the targets power (optional) 376 * regulator for controlling the AHCI controller (optional) 377 * 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node, 378 * or for non devicetree enabled platforms a single clock 379 * 4) resets, if flags has AHCI_PLATFORM_GET_RESETS (optional) 380 * 5) phys (optional) 381 * 382 * RETURNS: 383 * The allocated ahci_host_priv on success, otherwise an ERR_PTR value 384 */ 385struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev, 386 unsigned int flags) 387{ 388 struct device *dev = &pdev->dev; 389 struct ahci_host_priv *hpriv; 390 struct clk *clk; 391 struct device_node *child; 392 int i, enabled_ports = 0, rc = -ENOMEM, child_nodes; 393 u32 mask_port_map = 0; 394 395 if (!devres_open_group(dev, NULL, GFP_KERNEL)) 396 return ERR_PTR(-ENOMEM); 397 398 hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv), 399 GFP_KERNEL); 400 if (!hpriv) 401 goto err_out; 402 403 devres_add(dev, hpriv); 404 405 hpriv->mmio = devm_ioremap_resource(dev, 406 platform_get_resource(pdev, IORESOURCE_MEM, 0)); 407 if (IS_ERR(hpriv->mmio)) { 408 rc = PTR_ERR(hpriv->mmio); 409 goto err_out; 410 } 411 412 for (i = 0; i < AHCI_MAX_CLKS; i++) { 413 /* 414 * For now we must use clk_get(dev, NULL) for the first clock, 415 * because some platforms (da850, spear13xx) are not yet 416 * converted to use devicetree for clocks. For new platforms 417 * this is equivalent to of_clk_get(dev->of_node, 0). 418 */ 419 if (i == 0) 420 clk = clk_get(dev, NULL); 421 else 422 clk = of_clk_get(dev->of_node, i); 423 424 if (IS_ERR(clk)) { 425 rc = PTR_ERR(clk); 426 if (rc == -EPROBE_DEFER) 427 goto err_out; 428 break; 429 } 430 hpriv->clks[i] = clk; 431 } 432 433 hpriv->ahci_regulator = devm_regulator_get(dev, "ahci"); 434 if (IS_ERR(hpriv->ahci_regulator)) { 435 rc = PTR_ERR(hpriv->ahci_regulator); 436 if (rc != 0) 437 goto err_out; 438 } 439 440 hpriv->phy_regulator = devm_regulator_get(dev, "phy"); 441 if (IS_ERR(hpriv->phy_regulator)) { 442 rc = PTR_ERR(hpriv->phy_regulator); 443 goto err_out; 444 } 445 446 if (flags & AHCI_PLATFORM_GET_RESETS) { 447 hpriv->rsts = devm_reset_control_array_get_optional_shared(dev); 448 if (IS_ERR(hpriv->rsts)) { 449 rc = PTR_ERR(hpriv->rsts); 450 goto err_out; 451 } 452 } 453 454 /* 455 * Too many sub-nodes most likely means having something wrong with 456 * the firmware. 457 */ 458 child_nodes = of_get_child_count(dev->of_node); 459 if (child_nodes > AHCI_MAX_PORTS) { 460 rc = -EINVAL; 461 goto err_out; 462 } 463 464 /* 465 * If no sub-node was found, we still need to set nports to 466 * one in order to be able to use the 467 * ahci_platform_[en|dis]able_[phys|regulators] functions. 468 */ 469 if (child_nodes) 470 hpriv->nports = child_nodes; 471 else 472 hpriv->nports = 1; 473 474 hpriv->phys = devm_kcalloc(dev, hpriv->nports, sizeof(*hpriv->phys), GFP_KERNEL); 475 if (!hpriv->phys) { 476 rc = -ENOMEM; 477 goto err_out; 478 } 479 /* 480 * We cannot use devm_ here, since ahci_platform_put_resources() uses 481 * target_pwrs after devm_ have freed memory 482 */ 483 hpriv->target_pwrs = kcalloc(hpriv->nports, sizeof(*hpriv->target_pwrs), GFP_KERNEL); 484 if (!hpriv->target_pwrs) { 485 rc = -ENOMEM; 486 goto err_out; 487 } 488 489 if (child_nodes) { 490 for_each_child_of_node(dev->of_node, child) { 491 u32 port; 492 struct platform_device *port_dev __maybe_unused; 493 494 if (!of_device_is_available(child)) 495 continue; 496 497 if (of_property_read_u32(child, "reg", &port)) { 498 rc = -EINVAL; 499 of_node_put(child); 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 of_node_put(child); 519 goto err_out; 520 } 521 } 522#endif 523 524 rc = ahci_platform_get_phy(hpriv, port, dev, child); 525 if (rc) { 526 of_node_put(child); 527 goto err_out; 528 } 529 530 enabled_ports++; 531 } 532 if (!enabled_ports) { 533 dev_warn(dev, "No port enabled\n"); 534 rc = -ENODEV; 535 goto err_out; 536 } 537 538 if (!hpriv->mask_port_map) 539 hpriv->mask_port_map = mask_port_map; 540 } else { 541 /* 542 * If no sub-node was found, keep this for device tree 543 * compatibility 544 */ 545 rc = ahci_platform_get_phy(hpriv, 0, dev, dev->of_node); 546 if (rc) 547 goto err_out; 548 549 rc = ahci_platform_get_regulator(hpriv, 0, dev); 550 if (rc == -EPROBE_DEFER) 551 goto err_out; 552 } 553 pm_runtime_enable(dev); 554 pm_runtime_get_sync(dev); 555 hpriv->got_runtime_pm = true; 556 557 devres_remove_group(dev, NULL); 558 return hpriv; 559 560err_out: 561 devres_release_group(dev, NULL); 562 return ERR_PTR(rc); 563} 564EXPORT_SYMBOL_GPL(ahci_platform_get_resources); 565 566/** 567 * ahci_platform_init_host - Bring up an ahci-platform host 568 * @pdev: platform device pointer for the host 569 * @hpriv: ahci-host private data for the host 570 * @pi_template: template for the ata_port_info to use 571 * @sht: scsi_host_template to use when registering 572 * 573 * This function does all the usual steps needed to bring up an 574 * ahci-platform host, note any necessary resources (ie clks, phys, etc.) 575 * must be initialized / enabled before calling this. 576 * 577 * RETURNS: 578 * 0 on success otherwise a negative error code 579 */ 580int ahci_platform_init_host(struct platform_device *pdev, 581 struct ahci_host_priv *hpriv, 582 const struct ata_port_info *pi_template, 583 struct scsi_host_template *sht) 584{ 585 struct device *dev = &pdev->dev; 586 struct ata_port_info pi = *pi_template; 587 const struct ata_port_info *ppi[] = { &pi, NULL }; 588 struct ata_host *host; 589 int i, irq, n_ports, rc; 590 591 irq = platform_get_irq(pdev, 0); 592 if (irq < 0) { 593 if (irq != -EPROBE_DEFER) 594 dev_err(dev, "no irq\n"); 595 return irq; 596 } 597 if (!irq) 598 return -EINVAL; 599 600 hpriv->irq = irq; 601 602 /* prepare host */ 603 pi.private_data = (void *)(unsigned long)hpriv->flags; 604 605 ahci_save_initial_config(dev, hpriv); 606 607 if (hpriv->cap & HOST_CAP_NCQ) 608 pi.flags |= ATA_FLAG_NCQ; 609 610 if (hpriv->cap & HOST_CAP_PMP) 611 pi.flags |= ATA_FLAG_PMP; 612 613 ahci_set_em_messages(hpriv, &pi); 614 615 /* CAP.NP sometimes indicate the index of the last enabled 616 * port, at other times, that of the last possible port, so 617 * determining the maximum port number requires looking at 618 * both CAP.NP and port_map. 619 */ 620 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map)); 621 622 host = ata_host_alloc_pinfo(dev, ppi, n_ports); 623 if (!host) 624 return -ENOMEM; 625 626 host->private_data = hpriv; 627 628 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss) 629 host->flags |= ATA_HOST_PARALLEL_SCAN; 630 else 631 dev_info(dev, "SSS flag set, parallel bus scan disabled\n"); 632 633 if (pi.flags & ATA_FLAG_EM) 634 ahci_reset_em(host); 635 636 for (i = 0; i < host->n_ports; i++) { 637 struct ata_port *ap = host->ports[i]; 638 639 ata_port_desc(ap, "mmio %pR", 640 platform_get_resource(pdev, IORESOURCE_MEM, 0)); 641 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80); 642 643 /* set enclosure management message type */ 644 if (ap->flags & ATA_FLAG_EM) 645 ap->em_message_type = hpriv->em_msg_type; 646 647 /* disabled/not-implemented port */ 648 if (!(hpriv->port_map & (1 << i))) 649 ap->ops = &ata_dummy_port_ops; 650 } 651 652 if (hpriv->cap & HOST_CAP_64) { 653 rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64)); 654 if (rc) { 655 rc = dma_coerce_mask_and_coherent(dev, 656 DMA_BIT_MASK(32)); 657 if (rc) { 658 dev_err(dev, "Failed to enable 64-bit DMA.\n"); 659 return rc; 660 } 661 dev_warn(dev, "Enable 32-bit DMA instead of 64-bit.\n"); 662 } 663 } 664 665 rc = ahci_reset_controller(host); 666 if (rc) 667 return rc; 668 669 ahci_init_controller(host); 670 ahci_print_info(host, "platform"); 671 672 return ahci_host_activate(host, sht); 673} 674EXPORT_SYMBOL_GPL(ahci_platform_init_host); 675 676static void ahci_host_stop(struct ata_host *host) 677{ 678 struct ahci_host_priv *hpriv = host->private_data; 679 680 ahci_platform_disable_resources(hpriv); 681} 682 683/** 684 * ahci_platform_shutdown - Disable interrupts and stop DMA for host ports 685 * @pdev: platform device pointer for the host 686 * 687 * This function is called during system shutdown and performs the minimal 688 * deconfiguration required to ensure that an ahci_platform host cannot 689 * corrupt or otherwise interfere with a new kernel being started with kexec. 690 */ 691void ahci_platform_shutdown(struct platform_device *pdev) 692{ 693 struct ata_host *host = platform_get_drvdata(pdev); 694 struct ahci_host_priv *hpriv = host->private_data; 695 void __iomem *mmio = hpriv->mmio; 696 int i; 697 698 for (i = 0; i < host->n_ports; i++) { 699 struct ata_port *ap = host->ports[i]; 700 701 /* Disable port interrupts */ 702 if (ap->ops->freeze) 703 ap->ops->freeze(ap); 704 705 /* Stop the port DMA engines */ 706 if (ap->ops->port_stop) 707 ap->ops->port_stop(ap); 708 } 709 710 /* Disable and clear host interrupts */ 711 writel(readl(mmio + HOST_CTL) & ~HOST_IRQ_EN, mmio + HOST_CTL); 712 readl(mmio + HOST_CTL); /* flush */ 713 writel(GENMASK(host->n_ports, 0), mmio + HOST_IRQ_STAT); 714} 715EXPORT_SYMBOL_GPL(ahci_platform_shutdown); 716 717#ifdef CONFIG_PM_SLEEP 718/** 719 * ahci_platform_suspend_host - Suspend an ahci-platform host 720 * @dev: device pointer for the host 721 * 722 * This function does all the usual steps needed to suspend an 723 * ahci-platform host, note any necessary resources (ie clks, phys, etc.) 724 * must be disabled after calling this. 725 * 726 * RETURNS: 727 * 0 on success otherwise a negative error code 728 */ 729int ahci_platform_suspend_host(struct device *dev) 730{ 731 struct ata_host *host = dev_get_drvdata(dev); 732 struct ahci_host_priv *hpriv = host->private_data; 733 void __iomem *mmio = hpriv->mmio; 734 u32 ctl; 735 736 if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) { 737 dev_err(dev, "firmware update required for suspend/resume\n"); 738 return -EIO; 739 } 740 741 /* 742 * AHCI spec rev1.1 section 8.3.3: 743 * Software must disable interrupts prior to requesting a 744 * transition of the HBA to D3 state. 745 */ 746 ctl = readl(mmio + HOST_CTL); 747 ctl &= ~HOST_IRQ_EN; 748 writel(ctl, mmio + HOST_CTL); 749 readl(mmio + HOST_CTL); /* flush */ 750 751 if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS) 752 ahci_platform_disable_phys(hpriv); 753 754 return ata_host_suspend(host, PMSG_SUSPEND); 755} 756EXPORT_SYMBOL_GPL(ahci_platform_suspend_host); 757 758/** 759 * ahci_platform_resume_host - Resume an ahci-platform host 760 * @dev: device pointer for the host 761 * 762 * This function does all the usual steps needed to resume an ahci-platform 763 * host, note any necessary resources (ie clks, phys, etc.) must be 764 * initialized / enabled before calling this. 765 * 766 * RETURNS: 767 * 0 on success otherwise a negative error code 768 */ 769int ahci_platform_resume_host(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 if (dev->power.power_state.event == PM_EVENT_SUSPEND) { 776 rc = ahci_reset_controller(host); 777 if (rc) 778 return rc; 779 780 ahci_init_controller(host); 781 } 782 783 if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS) 784 ahci_platform_enable_phys(hpriv); 785 786 ata_host_resume(host); 787 788 return 0; 789} 790EXPORT_SYMBOL_GPL(ahci_platform_resume_host); 791 792/** 793 * ahci_platform_suspend - Suspend an ahci-platform device 794 * @dev: the platform device to suspend 795 * 796 * This function suspends the host associated with the device, followed by 797 * disabling all the resources of the device. 798 * 799 * RETURNS: 800 * 0 on success otherwise a negative error code 801 */ 802int ahci_platform_suspend(struct device *dev) 803{ 804 struct ata_host *host = dev_get_drvdata(dev); 805 struct ahci_host_priv *hpriv = host->private_data; 806 int rc; 807 808 rc = ahci_platform_suspend_host(dev); 809 if (rc) 810 return rc; 811 812 ahci_platform_disable_resources(hpriv); 813 814 return 0; 815} 816EXPORT_SYMBOL_GPL(ahci_platform_suspend); 817 818/** 819 * ahci_platform_resume - Resume an ahci-platform device 820 * @dev: the platform device to resume 821 * 822 * This function enables all the resources of the device followed by 823 * resuming the host associated with the device. 824 * 825 * RETURNS: 826 * 0 on success otherwise a negative error code 827 */ 828int ahci_platform_resume(struct device *dev) 829{ 830 struct ata_host *host = dev_get_drvdata(dev); 831 struct ahci_host_priv *hpriv = host->private_data; 832 int rc; 833 834 rc = ahci_platform_enable_resources(hpriv); 835 if (rc) 836 return rc; 837 838 rc = ahci_platform_resume_host(dev); 839 if (rc) 840 goto disable_resources; 841 842 /* We resumed so update PM runtime state */ 843 pm_runtime_disable(dev); 844 pm_runtime_set_active(dev); 845 pm_runtime_enable(dev); 846 847 return 0; 848 849disable_resources: 850 ahci_platform_disable_resources(hpriv); 851 852 return rc; 853} 854EXPORT_SYMBOL_GPL(ahci_platform_resume); 855#endif 856 857MODULE_DESCRIPTION("AHCI SATA platform library"); 858MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); 859MODULE_LICENSE("GPL"); 860