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