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 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 && !(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 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 EXPORT_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 */ 85 void 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 } 94 EXPORT_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 */ 107 int 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; 117 118 disable_unprepare_clk: 119 while (--c >= 0) 120 clk_disable_unprepare(hpriv->clks[c]); 121 return rc; 122 } 123 EXPORT_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 */ 132 void 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 } 140 EXPORT_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 */ 154 int 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; 176 177 disable_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); 183 disable_ahci_pwrs: 184 regulator_disable(hpriv->ahci_regulator); 185 return rc; 186 } 187 EXPORT_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 */ 196 void 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 } 209 EXPORT_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 */ 227 int 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; 248 249 disable_resets: 250 reset_control_assert(hpriv->rsts); 251 252 disable_clks: 253 ahci_platform_disable_clks(hpriv); 254 255 disable_regulator: 256 ahci_platform_disable_regulators(hpriv); 257 258 return rc; 259 } 260 EXPORT_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 */ 273 void 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 } 283 EXPORT_SYMBOL_GPL(ahci_platform_disable_resources); 284 285 static 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 } 308 309 static 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 } 349 350 static 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 */ 385 struct 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 hpriv->nports = child_nodes = of_get_child_count(dev->of_node); 455 456 /* 457 * If no sub-node was found, we still need to set nports to 458 * one in order to be able to use the 459 * ahci_platform_[en|dis]able_[phys|regulators] functions. 460 */ 461 if (!child_nodes) 462 hpriv->nports = 1; 463 464 hpriv->phys = devm_kcalloc(dev, hpriv->nports, sizeof(*hpriv->phys), GFP_KERNEL); 465 if (!hpriv->phys) { 466 rc = -ENOMEM; 467 goto err_out; 468 } 469 /* 470 * We cannot use devm_ here, since ahci_platform_put_resources() uses 471 * target_pwrs after devm_ have freed memory 472 */ 473 hpriv->target_pwrs = kcalloc(hpriv->nports, sizeof(*hpriv->target_pwrs), GFP_KERNEL); 474 if (!hpriv->target_pwrs) { 475 rc = -ENOMEM; 476 goto err_out; 477 } 478 479 if (child_nodes) { 480 for_each_child_of_node(dev->of_node, child) { 481 u32 port; 482 struct platform_device *port_dev __maybe_unused; 483 484 if (!of_device_is_available(child)) 485 continue; 486 487 if (of_property_read_u32(child, "reg", &port)) { 488 rc = -EINVAL; 489 of_node_put(child); 490 goto err_out; 491 } 492 493 if (port >= hpriv->nports) { 494 dev_warn(dev, "invalid port number %d\n", port); 495 continue; 496 } 497 mask_port_map |= BIT(port); 498 499 #ifdef CONFIG_OF_ADDRESS 500 of_platform_device_create(child, NULL, NULL); 501 502 port_dev = of_find_device_by_node(child); 503 504 if (port_dev) { 505 rc = ahci_platform_get_regulator(hpriv, port, 506 &port_dev->dev); 507 if (rc == -EPROBE_DEFER) { 508 of_node_put(child); 509 goto err_out; 510 } 511 } 512 #endif 513 514 rc = ahci_platform_get_phy(hpriv, port, dev, child); 515 if (rc) { 516 of_node_put(child); 517 goto err_out; 518 } 519 520 enabled_ports++; 521 } 522 if (!enabled_ports) { 523 dev_warn(dev, "No port enabled\n"); 524 rc = -ENODEV; 525 goto err_out; 526 } 527 528 if (!hpriv->mask_port_map) 529 hpriv->mask_port_map = mask_port_map; 530 } else { 531 /* 532 * If no sub-node was found, keep this for device tree 533 * compatibility 534 */ 535 rc = ahci_platform_get_phy(hpriv, 0, dev, dev->of_node); 536 if (rc) 537 goto err_out; 538 539 rc = ahci_platform_get_regulator(hpriv, 0, dev); 540 if (rc == -EPROBE_DEFER) 541 goto err_out; 542 } 543 pm_runtime_enable(dev); 544 pm_runtime_get_sync(dev); 545 hpriv->got_runtime_pm = true; 546 547 devres_remove_group(dev, NULL); 548 return hpriv; 549 550 err_out: 551 devres_release_group(dev, NULL); 552 return ERR_PTR(rc); 553 } 554 EXPORT_SYMBOL_GPL(ahci_platform_get_resources); 555 556 /** 557 * ahci_platform_init_host - Bring up an ahci-platform host 558 * @pdev: platform device pointer for the host 559 * @hpriv: ahci-host private data for the host 560 * @pi_template: template for the ata_port_info to use 561 * @sht: scsi_host_template to use when registering 562 * 563 * This function does all the usual steps needed to bring up an 564 * ahci-platform host, note any necessary resources (ie clks, phys, etc.) 565 * must be initialized / enabled before calling this. 566 * 567 * RETURNS: 568 * 0 on success otherwise a negative error code 569 */ 570 int ahci_platform_init_host(struct platform_device *pdev, 571 struct ahci_host_priv *hpriv, 572 const struct ata_port_info *pi_template, 573 struct scsi_host_template *sht) 574 { 575 struct device *dev = &pdev->dev; 576 struct ata_port_info pi = *pi_template; 577 const struct ata_port_info *ppi[] = { &pi, NULL }; 578 struct ata_host *host; 579 int i, irq, n_ports, rc; 580 581 irq = platform_get_irq(pdev, 0); 582 if (irq < 0) 583 return irq; 584 if (!irq) 585 return -EINVAL; 586 587 hpriv->irq = irq; 588 589 /* prepare host */ 590 pi.private_data = (void *)(unsigned long)hpriv->flags; 591 592 ahci_save_initial_config(dev, hpriv); 593 594 if (hpriv->cap & HOST_CAP_NCQ) 595 pi.flags |= ATA_FLAG_NCQ; 596 597 if (hpriv->cap & HOST_CAP_PMP) 598 pi.flags |= ATA_FLAG_PMP; 599 600 ahci_set_em_messages(hpriv, &pi); 601 602 /* CAP.NP sometimes indicate the index of the last enabled 603 * port, at other times, that of the last possible port, so 604 * determining the maximum port number requires looking at 605 * both CAP.NP and port_map. 606 */ 607 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map)); 608 609 host = ata_host_alloc_pinfo(dev, ppi, n_ports); 610 if (!host) 611 return -ENOMEM; 612 613 host->private_data = hpriv; 614 615 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss) 616 host->flags |= ATA_HOST_PARALLEL_SCAN; 617 else 618 dev_info(dev, "SSS flag set, parallel bus scan disabled\n"); 619 620 if (pi.flags & ATA_FLAG_EM) 621 ahci_reset_em(host); 622 623 for (i = 0; i < host->n_ports; i++) { 624 struct ata_port *ap = host->ports[i]; 625 626 ata_port_desc(ap, "mmio %pR", 627 platform_get_resource(pdev, IORESOURCE_MEM, 0)); 628 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80); 629 630 /* set enclosure management message type */ 631 if (ap->flags & ATA_FLAG_EM) 632 ap->em_message_type = hpriv->em_msg_type; 633 634 /* disabled/not-implemented port */ 635 if (!(hpriv->port_map & (1 << i))) 636 ap->ops = &ata_dummy_port_ops; 637 } 638 639 if (hpriv->cap & HOST_CAP_64) { 640 rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64)); 641 if (rc) { 642 dev_err(dev, "Failed to enable 64-bit DMA.\n"); 643 return rc; 644 } 645 } 646 647 rc = ahci_reset_controller(host); 648 if (rc) 649 return rc; 650 651 ahci_init_controller(host); 652 ahci_print_info(host, "platform"); 653 654 return ahci_host_activate(host, sht); 655 } 656 EXPORT_SYMBOL_GPL(ahci_platform_init_host); 657 658 static void ahci_host_stop(struct ata_host *host) 659 { 660 struct ahci_host_priv *hpriv = host->private_data; 661 662 ahci_platform_disable_resources(hpriv); 663 } 664 665 /** 666 * ahci_platform_shutdown - Disable interrupts and stop DMA for host ports 667 * @pdev: platform device pointer for the host 668 * 669 * This function is called during system shutdown and performs the minimal 670 * deconfiguration required to ensure that an ahci_platform host cannot 671 * corrupt or otherwise interfere with a new kernel being started with kexec. 672 */ 673 void ahci_platform_shutdown(struct platform_device *pdev) 674 { 675 struct ata_host *host = platform_get_drvdata(pdev); 676 struct ahci_host_priv *hpriv = host->private_data; 677 void __iomem *mmio = hpriv->mmio; 678 int i; 679 680 for (i = 0; i < host->n_ports; i++) { 681 struct ata_port *ap = host->ports[i]; 682 683 /* Disable port interrupts */ 684 if (ap->ops->freeze) 685 ap->ops->freeze(ap); 686 687 /* Stop the port DMA engines */ 688 if (ap->ops->port_stop) 689 ap->ops->port_stop(ap); 690 } 691 692 /* Disable and clear host interrupts */ 693 writel(readl(mmio + HOST_CTL) & ~HOST_IRQ_EN, mmio + HOST_CTL); 694 readl(mmio + HOST_CTL); /* flush */ 695 writel(GENMASK(host->n_ports, 0), mmio + HOST_IRQ_STAT); 696 } 697 EXPORT_SYMBOL_GPL(ahci_platform_shutdown); 698 699 #ifdef CONFIG_PM_SLEEP 700 /** 701 * ahci_platform_suspend_host - Suspend an ahci-platform host 702 * @dev: device pointer for the host 703 * 704 * This function does all the usual steps needed to suspend an 705 * ahci-platform host, note any necessary resources (ie clks, phys, etc.) 706 * must be disabled after calling this. 707 * 708 * RETURNS: 709 * 0 on success otherwise a negative error code 710 */ 711 int ahci_platform_suspend_host(struct device *dev) 712 { 713 struct ata_host *host = dev_get_drvdata(dev); 714 struct ahci_host_priv *hpriv = host->private_data; 715 void __iomem *mmio = hpriv->mmio; 716 u32 ctl; 717 718 if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) { 719 dev_err(dev, "firmware update required for suspend/resume\n"); 720 return -EIO; 721 } 722 723 /* 724 * AHCI spec rev1.1 section 8.3.3: 725 * Software must disable interrupts prior to requesting a 726 * transition of the HBA to D3 state. 727 */ 728 ctl = readl(mmio + HOST_CTL); 729 ctl &= ~HOST_IRQ_EN; 730 writel(ctl, mmio + HOST_CTL); 731 readl(mmio + HOST_CTL); /* flush */ 732 733 if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS) 734 ahci_platform_disable_phys(hpriv); 735 736 return ata_host_suspend(host, PMSG_SUSPEND); 737 } 738 EXPORT_SYMBOL_GPL(ahci_platform_suspend_host); 739 740 /** 741 * ahci_platform_resume_host - Resume an ahci-platform host 742 * @dev: device pointer for the host 743 * 744 * This function does all the usual steps needed to resume an ahci-platform 745 * host, note any necessary resources (ie clks, phys, etc.) must be 746 * initialized / enabled before calling this. 747 * 748 * RETURNS: 749 * 0 on success otherwise a negative error code 750 */ 751 int ahci_platform_resume_host(struct device *dev) 752 { 753 struct ata_host *host = dev_get_drvdata(dev); 754 struct ahci_host_priv *hpriv = host->private_data; 755 int rc; 756 757 if (dev->power.power_state.event == PM_EVENT_SUSPEND) { 758 rc = ahci_reset_controller(host); 759 if (rc) 760 return rc; 761 762 ahci_init_controller(host); 763 } 764 765 if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS) 766 ahci_platform_enable_phys(hpriv); 767 768 ata_host_resume(host); 769 770 return 0; 771 } 772 EXPORT_SYMBOL_GPL(ahci_platform_resume_host); 773 774 /** 775 * ahci_platform_suspend - Suspend an ahci-platform device 776 * @dev: the platform device to suspend 777 * 778 * This function suspends the host associated with the device, followed by 779 * disabling all the resources of the device. 780 * 781 * RETURNS: 782 * 0 on success otherwise a negative error code 783 */ 784 int ahci_platform_suspend(struct device *dev) 785 { 786 struct ata_host *host = dev_get_drvdata(dev); 787 struct ahci_host_priv *hpriv = host->private_data; 788 int rc; 789 790 rc = ahci_platform_suspend_host(dev); 791 if (rc) 792 return rc; 793 794 ahci_platform_disable_resources(hpriv); 795 796 return 0; 797 } 798 EXPORT_SYMBOL_GPL(ahci_platform_suspend); 799 800 /** 801 * ahci_platform_resume - Resume an ahci-platform device 802 * @dev: the platform device to resume 803 * 804 * This function enables all the resources of the device followed by 805 * resuming the host associated with the device. 806 * 807 * RETURNS: 808 * 0 on success otherwise a negative error code 809 */ 810 int ahci_platform_resume(struct device *dev) 811 { 812 struct ata_host *host = dev_get_drvdata(dev); 813 struct ahci_host_priv *hpriv = host->private_data; 814 int rc; 815 816 rc = ahci_platform_enable_resources(hpriv); 817 if (rc) 818 return rc; 819 820 rc = ahci_platform_resume_host(dev); 821 if (rc) 822 goto disable_resources; 823 824 /* We resumed so update PM runtime state */ 825 pm_runtime_disable(dev); 826 pm_runtime_set_active(dev); 827 pm_runtime_enable(dev); 828 829 return 0; 830 831 disable_resources: 832 ahci_platform_disable_resources(hpriv); 833 834 return rc; 835 } 836 EXPORT_SYMBOL_GPL(ahci_platform_resume); 837 #endif 838 839 MODULE_DESCRIPTION("AHCI SATA platform library"); 840 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); 841 MODULE_LICENSE("GPL"); 842