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) { 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 /* fall through */ 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 if (rc == -EPROBE_DEFER) 444 goto err_out; 445 rc = 0; 446 hpriv->phy_regulator = NULL; 447 } 448 449 if (flags & AHCI_PLATFORM_GET_RESETS) { 450 hpriv->rsts = devm_reset_control_array_get_optional_shared(dev); 451 if (IS_ERR(hpriv->rsts)) { 452 rc = PTR_ERR(hpriv->rsts); 453 goto err_out; 454 } 455 } 456 457 hpriv->nports = child_nodes = of_get_child_count(dev->of_node); 458 459 /* 460 * If no sub-node was found, we still need to set nports to 461 * one in order to be able to use the 462 * ahci_platform_[en|dis]able_[phys|regulators] functions. 463 */ 464 if (!child_nodes) 465 hpriv->nports = 1; 466 467 hpriv->phys = devm_kcalloc(dev, hpriv->nports, sizeof(*hpriv->phys), GFP_KERNEL); 468 if (!hpriv->phys) { 469 rc = -ENOMEM; 470 goto err_out; 471 } 472 /* 473 * We cannot use devm_ here, since ahci_platform_put_resources() uses 474 * target_pwrs after devm_ have freed memory 475 */ 476 hpriv->target_pwrs = kcalloc(hpriv->nports, sizeof(*hpriv->target_pwrs), GFP_KERNEL); 477 if (!hpriv->target_pwrs) { 478 rc = -ENOMEM; 479 goto err_out; 480 } 481 482 if (child_nodes) { 483 for_each_child_of_node(dev->of_node, child) { 484 u32 port; 485 struct platform_device *port_dev __maybe_unused; 486 487 if (!of_device_is_available(child)) 488 continue; 489 490 if (of_property_read_u32(child, "reg", &port)) { 491 rc = -EINVAL; 492 of_node_put(child); 493 goto err_out; 494 } 495 496 if (port >= hpriv->nports) { 497 dev_warn(dev, "invalid port number %d\n", port); 498 continue; 499 } 500 mask_port_map |= BIT(port); 501 502 #ifdef CONFIG_OF_ADDRESS 503 of_platform_device_create(child, NULL, NULL); 504 505 port_dev = of_find_device_by_node(child); 506 507 if (port_dev) { 508 rc = ahci_platform_get_regulator(hpriv, port, 509 &port_dev->dev); 510 if (rc == -EPROBE_DEFER) { 511 of_node_put(child); 512 goto err_out; 513 } 514 } 515 #endif 516 517 rc = ahci_platform_get_phy(hpriv, port, dev, child); 518 if (rc) { 519 of_node_put(child); 520 goto err_out; 521 } 522 523 enabled_ports++; 524 } 525 if (!enabled_ports) { 526 dev_warn(dev, "No port enabled\n"); 527 rc = -ENODEV; 528 goto err_out; 529 } 530 531 if (!hpriv->mask_port_map) 532 hpriv->mask_port_map = mask_port_map; 533 } else { 534 /* 535 * If no sub-node was found, keep this for device tree 536 * compatibility 537 */ 538 rc = ahci_platform_get_phy(hpriv, 0, dev, dev->of_node); 539 if (rc) 540 goto err_out; 541 542 rc = ahci_platform_get_regulator(hpriv, 0, dev); 543 if (rc == -EPROBE_DEFER) 544 goto err_out; 545 } 546 pm_runtime_enable(dev); 547 pm_runtime_get_sync(dev); 548 hpriv->got_runtime_pm = true; 549 550 devres_remove_group(dev, NULL); 551 return hpriv; 552 553 err_out: 554 devres_release_group(dev, NULL); 555 return ERR_PTR(rc); 556 } 557 EXPORT_SYMBOL_GPL(ahci_platform_get_resources); 558 559 /** 560 * ahci_platform_init_host - Bring up an ahci-platform host 561 * @pdev: platform device pointer for the host 562 * @hpriv: ahci-host private data for the host 563 * @pi_template: template for the ata_port_info to use 564 * @sht: scsi_host_template to use when registering 565 * 566 * This function does all the usual steps needed to bring up an 567 * ahci-platform host, note any necessary resources (ie clks, phys, etc.) 568 * must be initialized / enabled before calling this. 569 * 570 * RETURNS: 571 * 0 on success otherwise a negative error code 572 */ 573 int ahci_platform_init_host(struct platform_device *pdev, 574 struct ahci_host_priv *hpriv, 575 const struct ata_port_info *pi_template, 576 struct scsi_host_template *sht) 577 { 578 struct device *dev = &pdev->dev; 579 struct ata_port_info pi = *pi_template; 580 const struct ata_port_info *ppi[] = { &pi, NULL }; 581 struct ata_host *host; 582 int i, irq, n_ports, rc; 583 584 irq = platform_get_irq(pdev, 0); 585 if (irq <= 0) { 586 if (irq != -EPROBE_DEFER) 587 dev_err(dev, "no irq\n"); 588 return irq; 589 } 590 591 hpriv->irq = irq; 592 593 /* prepare host */ 594 pi.private_data = (void *)(unsigned long)hpriv->flags; 595 596 ahci_save_initial_config(dev, hpriv); 597 598 if (hpriv->cap & HOST_CAP_NCQ) 599 pi.flags |= ATA_FLAG_NCQ; 600 601 if (hpriv->cap & HOST_CAP_PMP) 602 pi.flags |= ATA_FLAG_PMP; 603 604 ahci_set_em_messages(hpriv, &pi); 605 606 /* CAP.NP sometimes indicate the index of the last enabled 607 * port, at other times, that of the last possible port, so 608 * determining the maximum port number requires looking at 609 * both CAP.NP and port_map. 610 */ 611 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map)); 612 613 host = ata_host_alloc_pinfo(dev, ppi, n_ports); 614 if (!host) 615 return -ENOMEM; 616 617 host->private_data = hpriv; 618 619 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss) 620 host->flags |= ATA_HOST_PARALLEL_SCAN; 621 else 622 dev_info(dev, "SSS flag set, parallel bus scan disabled\n"); 623 624 if (pi.flags & ATA_FLAG_EM) 625 ahci_reset_em(host); 626 627 for (i = 0; i < host->n_ports; i++) { 628 struct ata_port *ap = host->ports[i]; 629 630 ata_port_desc(ap, "mmio %pR", 631 platform_get_resource(pdev, IORESOURCE_MEM, 0)); 632 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80); 633 634 /* set enclosure management message type */ 635 if (ap->flags & ATA_FLAG_EM) 636 ap->em_message_type = hpriv->em_msg_type; 637 638 /* disabled/not-implemented port */ 639 if (!(hpriv->port_map & (1 << i))) 640 ap->ops = &ata_dummy_port_ops; 641 } 642 643 if (hpriv->cap & HOST_CAP_64) { 644 rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64)); 645 if (rc) { 646 rc = dma_coerce_mask_and_coherent(dev, 647 DMA_BIT_MASK(32)); 648 if (rc) { 649 dev_err(dev, "Failed to enable 64-bit DMA.\n"); 650 return rc; 651 } 652 dev_warn(dev, "Enable 32-bit DMA instead of 64-bit.\n"); 653 } 654 } 655 656 rc = ahci_reset_controller(host); 657 if (rc) 658 return rc; 659 660 ahci_init_controller(host); 661 ahci_print_info(host, "platform"); 662 663 return ahci_host_activate(host, sht); 664 } 665 EXPORT_SYMBOL_GPL(ahci_platform_init_host); 666 667 static void ahci_host_stop(struct ata_host *host) 668 { 669 struct ahci_host_priv *hpriv = host->private_data; 670 671 ahci_platform_disable_resources(hpriv); 672 } 673 674 /** 675 * ahci_platform_shutdown - Disable interrupts and stop DMA for host ports 676 * @pdev: platform device pointer for the host 677 * 678 * This function is called during system shutdown and performs the minimal 679 * deconfiguration required to ensure that an ahci_platform host cannot 680 * corrupt or otherwise interfere with a new kernel being started with kexec. 681 */ 682 void ahci_platform_shutdown(struct platform_device *pdev) 683 { 684 struct ata_host *host = platform_get_drvdata(pdev); 685 struct ahci_host_priv *hpriv = host->private_data; 686 void __iomem *mmio = hpriv->mmio; 687 int i; 688 689 for (i = 0; i < host->n_ports; i++) { 690 struct ata_port *ap = host->ports[i]; 691 692 /* Disable port interrupts */ 693 if (ap->ops->freeze) 694 ap->ops->freeze(ap); 695 696 /* Stop the port DMA engines */ 697 if (ap->ops->port_stop) 698 ap->ops->port_stop(ap); 699 } 700 701 /* Disable and clear host interrupts */ 702 writel(readl(mmio + HOST_CTL) & ~HOST_IRQ_EN, mmio + HOST_CTL); 703 readl(mmio + HOST_CTL); /* flush */ 704 writel(GENMASK(host->n_ports, 0), mmio + HOST_IRQ_STAT); 705 } 706 EXPORT_SYMBOL_GPL(ahci_platform_shutdown); 707 708 #ifdef CONFIG_PM_SLEEP 709 /** 710 * ahci_platform_suspend_host - Suspend an ahci-platform host 711 * @dev: device pointer for the host 712 * 713 * This function does all the usual steps needed to suspend an 714 * ahci-platform host, note any necessary resources (ie clks, phys, etc.) 715 * must be disabled after calling this. 716 * 717 * RETURNS: 718 * 0 on success otherwise a negative error code 719 */ 720 int ahci_platform_suspend_host(struct device *dev) 721 { 722 struct ata_host *host = dev_get_drvdata(dev); 723 struct ahci_host_priv *hpriv = host->private_data; 724 void __iomem *mmio = hpriv->mmio; 725 u32 ctl; 726 727 if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) { 728 dev_err(dev, "firmware update required for suspend/resume\n"); 729 return -EIO; 730 } 731 732 /* 733 * AHCI spec rev1.1 section 8.3.3: 734 * Software must disable interrupts prior to requesting a 735 * transition of the HBA to D3 state. 736 */ 737 ctl = readl(mmio + HOST_CTL); 738 ctl &= ~HOST_IRQ_EN; 739 writel(ctl, mmio + HOST_CTL); 740 readl(mmio + HOST_CTL); /* flush */ 741 742 if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS) 743 ahci_platform_disable_phys(hpriv); 744 745 return ata_host_suspend(host, PMSG_SUSPEND); 746 } 747 EXPORT_SYMBOL_GPL(ahci_platform_suspend_host); 748 749 /** 750 * ahci_platform_resume_host - Resume an ahci-platform host 751 * @dev: device pointer for the host 752 * 753 * This function does all the usual steps needed to resume an ahci-platform 754 * host, note any necessary resources (ie clks, phys, etc.) must be 755 * initialized / enabled before calling this. 756 * 757 * RETURNS: 758 * 0 on success otherwise a negative error code 759 */ 760 int ahci_platform_resume_host(struct device *dev) 761 { 762 struct ata_host *host = dev_get_drvdata(dev); 763 struct ahci_host_priv *hpriv = host->private_data; 764 int rc; 765 766 if (dev->power.power_state.event == PM_EVENT_SUSPEND) { 767 rc = ahci_reset_controller(host); 768 if (rc) 769 return rc; 770 771 ahci_init_controller(host); 772 } 773 774 if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS) 775 ahci_platform_enable_phys(hpriv); 776 777 ata_host_resume(host); 778 779 return 0; 780 } 781 EXPORT_SYMBOL_GPL(ahci_platform_resume_host); 782 783 /** 784 * ahci_platform_suspend - Suspend an ahci-platform device 785 * @dev: the platform device to suspend 786 * 787 * This function suspends the host associated with the device, followed by 788 * disabling all the resources of the device. 789 * 790 * RETURNS: 791 * 0 on success otherwise a negative error code 792 */ 793 int ahci_platform_suspend(struct device *dev) 794 { 795 struct ata_host *host = dev_get_drvdata(dev); 796 struct ahci_host_priv *hpriv = host->private_data; 797 int rc; 798 799 rc = ahci_platform_suspend_host(dev); 800 if (rc) 801 return rc; 802 803 ahci_platform_disable_resources(hpriv); 804 805 return 0; 806 } 807 EXPORT_SYMBOL_GPL(ahci_platform_suspend); 808 809 /** 810 * ahci_platform_resume - Resume an ahci-platform device 811 * @dev: the platform device to resume 812 * 813 * This function enables all the resources of the device followed by 814 * resuming the host associated with the device. 815 * 816 * RETURNS: 817 * 0 on success otherwise a negative error code 818 */ 819 int ahci_platform_resume(struct device *dev) 820 { 821 struct ata_host *host = dev_get_drvdata(dev); 822 struct ahci_host_priv *hpriv = host->private_data; 823 int rc; 824 825 rc = ahci_platform_enable_resources(hpriv); 826 if (rc) 827 return rc; 828 829 rc = ahci_platform_resume_host(dev); 830 if (rc) 831 goto disable_resources; 832 833 /* We resumed so update PM runtime state */ 834 pm_runtime_disable(dev); 835 pm_runtime_set_active(dev); 836 pm_runtime_enable(dev); 837 838 return 0; 839 840 disable_resources: 841 ahci_platform_disable_resources(hpriv); 842 843 return rc; 844 } 845 EXPORT_SYMBOL_GPL(ahci_platform_resume); 846 #endif 847 848 MODULE_DESCRIPTION("AHCI SATA platform library"); 849 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); 850 MODULE_LICENSE("GPL"); 851