1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * AHCI SATA platform library 4 * 5 * Copyright 2004-2005 Red Hat, Inc. 6 * Jeff Garzik <jgarzik@pobox.com> 7 * Copyright 2010 MontaVista Software, LLC. 8 * Anton Vorontsov <avorontsov@ru.mvista.com> 9 */ 10 11 #include <linux/clk.h> 12 #include <linux/kernel.h> 13 #include <linux/gfp.h> 14 #include <linux/module.h> 15 #include <linux/pm.h> 16 #include <linux/interrupt.h> 17 #include <linux/device.h> 18 #include <linux/platform_device.h> 19 #include <linux/libata.h> 20 #include <linux/ahci_platform.h> 21 #include <linux/phy/phy.h> 22 #include <linux/pm_runtime.h> 23 #include <linux/of_platform.h> 24 #include <linux/reset.h> 25 #include "ahci.h" 26 27 static void ahci_host_stop(struct ata_host *host); 28 29 struct ata_port_operations ahci_platform_ops = { 30 .inherits = &ahci_ops, 31 .host_stop = ahci_host_stop, 32 }; 33 EXPORT_SYMBOL_GPL(ahci_platform_ops); 34 35 /** 36 * ahci_platform_enable_phys - Enable PHYs 37 * @hpriv: host private area to store config values 38 * 39 * This function enables all the PHYs found in hpriv->phys, if any. 40 * If a PHY fails to be enabled, it disables all the PHYs already 41 * enabled in reverse order and returns an error. 42 * 43 * RETURNS: 44 * 0 on success otherwise a negative error code 45 */ 46 static int ahci_platform_enable_phys(struct ahci_host_priv *hpriv) 47 { 48 int rc, i; 49 50 for (i = 0; i < hpriv->nports; i++) { 51 rc = phy_init(hpriv->phys[i]); 52 if (rc) 53 goto disable_phys; 54 55 rc = phy_set_mode(hpriv->phys[i], PHY_MODE_SATA); 56 if (rc) { 57 phy_exit(hpriv->phys[i]); 58 goto disable_phys; 59 } 60 61 rc = phy_power_on(hpriv->phys[i]); 62 if (rc) { 63 phy_exit(hpriv->phys[i]); 64 goto disable_phys; 65 } 66 } 67 68 return 0; 69 70 disable_phys: 71 while (--i >= 0) { 72 phy_power_off(hpriv->phys[i]); 73 phy_exit(hpriv->phys[i]); 74 } 75 return rc; 76 } 77 78 /** 79 * ahci_platform_disable_phys - Disable PHYs 80 * @hpriv: host private area to store config values 81 * 82 * This function disables all PHYs found in hpriv->phys. 83 */ 84 static void ahci_platform_disable_phys(struct ahci_host_priv *hpriv) 85 { 86 int i; 87 88 for (i = 0; i < hpriv->nports; i++) { 89 phy_power_off(hpriv->phys[i]); 90 phy_exit(hpriv->phys[i]); 91 } 92 } 93 94 /** 95 * ahci_platform_enable_clks - Enable platform clocks 96 * @hpriv: host private area to store config values 97 * 98 * This function enables all the clks found in hpriv->clks, starting at 99 * index 0. If any clk fails to enable it disables all the clks already 100 * enabled in reverse order, and then returns an error. 101 * 102 * RETURNS: 103 * 0 on success otherwise a negative error code 104 */ 105 int ahci_platform_enable_clks(struct ahci_host_priv *hpriv) 106 { 107 int c, rc; 108 109 for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) { 110 rc = clk_prepare_enable(hpriv->clks[c]); 111 if (rc) 112 goto disable_unprepare_clk; 113 } 114 return 0; 115 116 disable_unprepare_clk: 117 while (--c >= 0) 118 clk_disable_unprepare(hpriv->clks[c]); 119 return rc; 120 } 121 EXPORT_SYMBOL_GPL(ahci_platform_enable_clks); 122 123 /** 124 * ahci_platform_disable_clks - Disable platform clocks 125 * @hpriv: host private area to store config values 126 * 127 * This function disables all the clks found in hpriv->clks, in reverse 128 * order of ahci_platform_enable_clks (starting at the end of the array). 129 */ 130 void ahci_platform_disable_clks(struct ahci_host_priv *hpriv) 131 { 132 int c; 133 134 for (c = AHCI_MAX_CLKS - 1; c >= 0; c--) 135 if (hpriv->clks[c]) 136 clk_disable_unprepare(hpriv->clks[c]); 137 } 138 EXPORT_SYMBOL_GPL(ahci_platform_disable_clks); 139 140 /** 141 * ahci_platform_enable_regulators - Enable regulators 142 * @hpriv: host private area to store config values 143 * 144 * This function enables all the regulators found in controller and 145 * hpriv->target_pwrs, if any. If a regulator fails to be enabled, it 146 * disables all the regulators already enabled in reverse order and 147 * returns an error. 148 * 149 * RETURNS: 150 * 0 on success otherwise a negative error code 151 */ 152 int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv) 153 { 154 int rc, i; 155 156 if (hpriv->ahci_regulator) { 157 rc = regulator_enable(hpriv->ahci_regulator); 158 if (rc) 159 return rc; 160 } 161 162 if (hpriv->phy_regulator) { 163 rc = regulator_enable(hpriv->phy_regulator); 164 if (rc) 165 goto disable_ahci_pwrs; 166 } 167 168 for (i = 0; i < hpriv->nports; i++) { 169 if (!hpriv->target_pwrs[i]) 170 continue; 171 172 rc = regulator_enable(hpriv->target_pwrs[i]); 173 if (rc) 174 goto disable_target_pwrs; 175 } 176 177 return 0; 178 179 disable_target_pwrs: 180 while (--i >= 0) 181 if (hpriv->target_pwrs[i]) 182 regulator_disable(hpriv->target_pwrs[i]); 183 184 if (hpriv->phy_regulator) 185 regulator_disable(hpriv->phy_regulator); 186 disable_ahci_pwrs: 187 if (hpriv->ahci_regulator) 188 regulator_disable(hpriv->ahci_regulator); 189 return rc; 190 } 191 EXPORT_SYMBOL_GPL(ahci_platform_enable_regulators); 192 193 /** 194 * ahci_platform_disable_regulators - Disable regulators 195 * @hpriv: host private area to store config values 196 * 197 * This function disables all regulators found in hpriv->target_pwrs and 198 * AHCI controller. 199 */ 200 void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv) 201 { 202 int i; 203 204 for (i = 0; i < hpriv->nports; i++) { 205 if (!hpriv->target_pwrs[i]) 206 continue; 207 regulator_disable(hpriv->target_pwrs[i]); 208 } 209 210 if (hpriv->ahci_regulator) 211 regulator_disable(hpriv->ahci_regulator); 212 if (hpriv->phy_regulator) 213 regulator_disable(hpriv->phy_regulator); 214 } 215 EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators); 216 /** 217 * ahci_platform_enable_resources - Enable platform resources 218 * @hpriv: host private area to store config values 219 * 220 * This function enables all ahci_platform managed resources in the 221 * following order: 222 * 1) Regulator 223 * 2) Clocks (through ahci_platform_enable_clks) 224 * 3) Resets 225 * 4) Phys 226 * 227 * If resource enabling fails at any point the previous enabled resources 228 * are disabled in reverse order. 229 * 230 * RETURNS: 231 * 0 on success otherwise a negative error code 232 */ 233 int ahci_platform_enable_resources(struct ahci_host_priv *hpriv) 234 { 235 int rc; 236 237 rc = ahci_platform_enable_regulators(hpriv); 238 if (rc) 239 return rc; 240 241 rc = ahci_platform_enable_clks(hpriv); 242 if (rc) 243 goto disable_regulator; 244 245 rc = reset_control_deassert(hpriv->rsts); 246 if (rc) 247 goto disable_clks; 248 249 rc = ahci_platform_enable_phys(hpriv); 250 if (rc) 251 goto disable_resets; 252 253 return 0; 254 255 disable_resets: 256 reset_control_assert(hpriv->rsts); 257 258 disable_clks: 259 ahci_platform_disable_clks(hpriv); 260 261 disable_regulator: 262 ahci_platform_disable_regulators(hpriv); 263 264 return rc; 265 } 266 EXPORT_SYMBOL_GPL(ahci_platform_enable_resources); 267 268 /** 269 * ahci_platform_disable_resources - Disable platform resources 270 * @hpriv: host private area to store config values 271 * 272 * This function disables all ahci_platform managed resources in the 273 * following order: 274 * 1) Phys 275 * 2) Resets 276 * 3) Clocks (through ahci_platform_disable_clks) 277 * 4) Regulator 278 */ 279 void ahci_platform_disable_resources(struct ahci_host_priv *hpriv) 280 { 281 ahci_platform_disable_phys(hpriv); 282 283 reset_control_assert(hpriv->rsts); 284 285 ahci_platform_disable_clks(hpriv); 286 287 ahci_platform_disable_regulators(hpriv); 288 } 289 EXPORT_SYMBOL_GPL(ahci_platform_disable_resources); 290 291 static void ahci_platform_put_resources(struct device *dev, void *res) 292 { 293 struct ahci_host_priv *hpriv = res; 294 int c; 295 296 if (hpriv->got_runtime_pm) { 297 pm_runtime_put_sync(dev); 298 pm_runtime_disable(dev); 299 } 300 301 for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) 302 clk_put(hpriv->clks[c]); 303 /* 304 * The regulators are tied to child node device and not to the 305 * SATA device itself. So we can't use devm for automatically 306 * releasing them. We have to do it manually here. 307 */ 308 for (c = 0; c < hpriv->nports; c++) 309 if (hpriv->target_pwrs && hpriv->target_pwrs[c]) 310 regulator_put(hpriv->target_pwrs[c]); 311 312 kfree(hpriv->target_pwrs); 313 } 314 315 static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port, 316 struct device *dev, struct device_node *node) 317 { 318 int rc; 319 320 hpriv->phys[port] = devm_of_phy_get(dev, node, NULL); 321 322 if (!IS_ERR(hpriv->phys[port])) 323 return 0; 324 325 rc = PTR_ERR(hpriv->phys[port]); 326 switch (rc) { 327 case -ENOSYS: 328 /* No PHY support. Check if PHY is required. */ 329 if (of_find_property(node, "phys", NULL)) { 330 dev_err(dev, 331 "couldn't get PHY in node %pOFn: ENOSYS\n", 332 node); 333 break; 334 } 335 /* fall through */ 336 case -ENODEV: 337 /* continue normally */ 338 hpriv->phys[port] = NULL; 339 rc = 0; 340 break; 341 case -EPROBE_DEFER: 342 /* Do not complain yet */ 343 break; 344 345 default: 346 dev_err(dev, 347 "couldn't get PHY in node %pOFn: %d\n", 348 node, rc); 349 350 break; 351 } 352 353 return rc; 354 } 355 356 static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port, 357 struct device *dev) 358 { 359 struct regulator *target_pwr; 360 int rc = 0; 361 362 target_pwr = regulator_get_optional(dev, "target"); 363 364 if (!IS_ERR(target_pwr)) 365 hpriv->target_pwrs[port] = target_pwr; 366 else 367 rc = PTR_ERR(target_pwr); 368 369 return rc; 370 } 371 372 /** 373 * ahci_platform_get_resources - Get platform resources 374 * @pdev: platform device to get resources for 375 * @flags: bitmap representing the resource to get 376 * 377 * This function allocates an ahci_host_priv struct, and gets the following 378 * resources, storing a reference to them inside the returned struct: 379 * 380 * 1) mmio registers (IORESOURCE_MEM 0, mandatory) 381 * 2) regulator for controlling the targets power (optional) 382 * regulator for controlling the AHCI controller (optional) 383 * 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node, 384 * or for non devicetree enabled platforms a single clock 385 * 4) resets, if flags has AHCI_PLATFORM_GET_RESETS (optional) 386 * 5) phys (optional) 387 * 388 * RETURNS: 389 * The allocated ahci_host_priv on success, otherwise an ERR_PTR value 390 */ 391 struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev, 392 unsigned int flags) 393 { 394 struct device *dev = &pdev->dev; 395 struct ahci_host_priv *hpriv; 396 struct clk *clk; 397 struct device_node *child; 398 int i, enabled_ports = 0, rc = -ENOMEM, child_nodes; 399 u32 mask_port_map = 0; 400 401 if (!devres_open_group(dev, NULL, GFP_KERNEL)) 402 return ERR_PTR(-ENOMEM); 403 404 hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv), 405 GFP_KERNEL); 406 if (!hpriv) 407 goto err_out; 408 409 devres_add(dev, hpriv); 410 411 hpriv->mmio = devm_ioremap_resource(dev, 412 platform_get_resource(pdev, IORESOURCE_MEM, 0)); 413 if (IS_ERR(hpriv->mmio)) { 414 rc = PTR_ERR(hpriv->mmio); 415 goto err_out; 416 } 417 418 for (i = 0; i < AHCI_MAX_CLKS; i++) { 419 /* 420 * For now we must use clk_get(dev, NULL) for the first clock, 421 * because some platforms (da850, spear13xx) are not yet 422 * converted to use devicetree for clocks. For new platforms 423 * this is equivalent to of_clk_get(dev->of_node, 0). 424 */ 425 if (i == 0) 426 clk = clk_get(dev, NULL); 427 else 428 clk = of_clk_get(dev->of_node, i); 429 430 if (IS_ERR(clk)) { 431 rc = PTR_ERR(clk); 432 if (rc == -EPROBE_DEFER) 433 goto err_out; 434 break; 435 } 436 hpriv->clks[i] = clk; 437 } 438 439 hpriv->ahci_regulator = devm_regulator_get_optional(dev, "ahci"); 440 if (IS_ERR(hpriv->ahci_regulator)) { 441 rc = PTR_ERR(hpriv->ahci_regulator); 442 if (rc == -EPROBE_DEFER) 443 goto err_out; 444 rc = 0; 445 hpriv->ahci_regulator = NULL; 446 } 447 448 hpriv->phy_regulator = devm_regulator_get_optional(dev, "phy"); 449 if (IS_ERR(hpriv->phy_regulator)) { 450 rc = PTR_ERR(hpriv->phy_regulator); 451 if (rc == -EPROBE_DEFER) 452 goto err_out; 453 rc = 0; 454 hpriv->phy_regulator = NULL; 455 } 456 457 if (flags & AHCI_PLATFORM_GET_RESETS) { 458 hpriv->rsts = devm_reset_control_array_get_optional_shared(dev); 459 if (IS_ERR(hpriv->rsts)) { 460 rc = PTR_ERR(hpriv->rsts); 461 goto err_out; 462 } 463 } 464 465 hpriv->nports = child_nodes = of_get_child_count(dev->of_node); 466 467 /* 468 * If no sub-node was found, we still need to set nports to 469 * one in order to be able to use the 470 * ahci_platform_[en|dis]able_[phys|regulators] functions. 471 */ 472 if (!child_nodes) 473 hpriv->nports = 1; 474 475 hpriv->phys = devm_kcalloc(dev, hpriv->nports, sizeof(*hpriv->phys), GFP_KERNEL); 476 if (!hpriv->phys) { 477 rc = -ENOMEM; 478 goto err_out; 479 } 480 /* 481 * We cannot use devm_ here, since ahci_platform_put_resources() uses 482 * target_pwrs after devm_ have freed memory 483 */ 484 hpriv->target_pwrs = kcalloc(hpriv->nports, sizeof(*hpriv->target_pwrs), GFP_KERNEL); 485 if (!hpriv->target_pwrs) { 486 rc = -ENOMEM; 487 goto err_out; 488 } 489 490 if (child_nodes) { 491 for_each_child_of_node(dev->of_node, child) { 492 u32 port; 493 struct platform_device *port_dev __maybe_unused; 494 495 if (!of_device_is_available(child)) 496 continue; 497 498 if (of_property_read_u32(child, "reg", &port)) { 499 rc = -EINVAL; 500 of_node_put(child); 501 goto err_out; 502 } 503 504 if (port >= hpriv->nports) { 505 dev_warn(dev, "invalid port number %d\n", port); 506 continue; 507 } 508 mask_port_map |= BIT(port); 509 510 #ifdef CONFIG_OF_ADDRESS 511 of_platform_device_create(child, NULL, NULL); 512 513 port_dev = of_find_device_by_node(child); 514 515 if (port_dev) { 516 rc = ahci_platform_get_regulator(hpriv, port, 517 &port_dev->dev); 518 if (rc == -EPROBE_DEFER) { 519 of_node_put(child); 520 goto err_out; 521 } 522 } 523 #endif 524 525 rc = ahci_platform_get_phy(hpriv, port, dev, child); 526 if (rc) { 527 of_node_put(child); 528 goto err_out; 529 } 530 531 enabled_ports++; 532 } 533 if (!enabled_ports) { 534 dev_warn(dev, "No port enabled\n"); 535 rc = -ENODEV; 536 goto err_out; 537 } 538 539 if (!hpriv->mask_port_map) 540 hpriv->mask_port_map = mask_port_map; 541 } else { 542 /* 543 * If no sub-node was found, keep this for device tree 544 * compatibility 545 */ 546 rc = ahci_platform_get_phy(hpriv, 0, dev, dev->of_node); 547 if (rc) 548 goto err_out; 549 550 rc = ahci_platform_get_regulator(hpriv, 0, dev); 551 if (rc == -EPROBE_DEFER) 552 goto err_out; 553 } 554 pm_runtime_enable(dev); 555 pm_runtime_get_sync(dev); 556 hpriv->got_runtime_pm = true; 557 558 devres_remove_group(dev, NULL); 559 return hpriv; 560 561 err_out: 562 devres_release_group(dev, NULL); 563 return ERR_PTR(rc); 564 } 565 EXPORT_SYMBOL_GPL(ahci_platform_get_resources); 566 567 /** 568 * ahci_platform_init_host - Bring up an ahci-platform host 569 * @pdev: platform device pointer for the host 570 * @hpriv: ahci-host private data for the host 571 * @pi_template: template for the ata_port_info to use 572 * @sht: scsi_host_template to use when registering 573 * 574 * This function does all the usual steps needed to bring up an 575 * ahci-platform host, note any necessary resources (ie clks, phys, etc.) 576 * must be initialized / enabled before calling this. 577 * 578 * RETURNS: 579 * 0 on success otherwise a negative error code 580 */ 581 int ahci_platform_init_host(struct platform_device *pdev, 582 struct ahci_host_priv *hpriv, 583 const struct ata_port_info *pi_template, 584 struct scsi_host_template *sht) 585 { 586 struct device *dev = &pdev->dev; 587 struct ata_port_info pi = *pi_template; 588 const struct ata_port_info *ppi[] = { &pi, NULL }; 589 struct ata_host *host; 590 int i, irq, n_ports, rc; 591 592 irq = platform_get_irq(pdev, 0); 593 if (irq <= 0) { 594 if (irq != -EPROBE_DEFER) 595 dev_err(dev, "no irq\n"); 596 return irq; 597 } 598 599 hpriv->irq = irq; 600 601 /* prepare host */ 602 pi.private_data = (void *)(unsigned long)hpriv->flags; 603 604 ahci_save_initial_config(dev, hpriv); 605 606 if (hpriv->cap & HOST_CAP_NCQ) 607 pi.flags |= ATA_FLAG_NCQ; 608 609 if (hpriv->cap & HOST_CAP_PMP) 610 pi.flags |= ATA_FLAG_PMP; 611 612 ahci_set_em_messages(hpriv, &pi); 613 614 /* CAP.NP sometimes indicate the index of the last enabled 615 * port, at other times, that of the last possible port, so 616 * determining the maximum port number requires looking at 617 * both CAP.NP and port_map. 618 */ 619 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map)); 620 621 host = ata_host_alloc_pinfo(dev, ppi, n_ports); 622 if (!host) 623 return -ENOMEM; 624 625 host->private_data = hpriv; 626 627 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss) 628 host->flags |= ATA_HOST_PARALLEL_SCAN; 629 else 630 dev_info(dev, "SSS flag set, parallel bus scan disabled\n"); 631 632 if (pi.flags & ATA_FLAG_EM) 633 ahci_reset_em(host); 634 635 for (i = 0; i < host->n_ports; i++) { 636 struct ata_port *ap = host->ports[i]; 637 638 ata_port_desc(ap, "mmio %pR", 639 platform_get_resource(pdev, IORESOURCE_MEM, 0)); 640 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80); 641 642 /* set enclosure management message type */ 643 if (ap->flags & ATA_FLAG_EM) 644 ap->em_message_type = hpriv->em_msg_type; 645 646 /* disabled/not-implemented port */ 647 if (!(hpriv->port_map & (1 << i))) 648 ap->ops = &ata_dummy_port_ops; 649 } 650 651 if (hpriv->cap & HOST_CAP_64) { 652 rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64)); 653 if (rc) { 654 rc = dma_coerce_mask_and_coherent(dev, 655 DMA_BIT_MASK(32)); 656 if (rc) { 657 dev_err(dev, "Failed to enable 64-bit DMA.\n"); 658 return rc; 659 } 660 dev_warn(dev, "Enable 32-bit DMA instead of 64-bit.\n"); 661 } 662 } 663 664 rc = ahci_reset_controller(host); 665 if (rc) 666 return rc; 667 668 ahci_init_controller(host); 669 ahci_print_info(host, "platform"); 670 671 return ahci_host_activate(host, sht); 672 } 673 EXPORT_SYMBOL_GPL(ahci_platform_init_host); 674 675 static void ahci_host_stop(struct ata_host *host) 676 { 677 struct ahci_host_priv *hpriv = host->private_data; 678 679 ahci_platform_disable_resources(hpriv); 680 } 681 682 /** 683 * ahci_platform_shutdown - Disable interrupts and stop DMA for host ports 684 * @pdev: platform device pointer for the host 685 * 686 * This function is called during system shutdown and performs the minimal 687 * deconfiguration required to ensure that an ahci_platform host cannot 688 * corrupt or otherwise interfere with a new kernel being started with kexec. 689 */ 690 void ahci_platform_shutdown(struct platform_device *pdev) 691 { 692 struct ata_host *host = platform_get_drvdata(pdev); 693 struct ahci_host_priv *hpriv = host->private_data; 694 void __iomem *mmio = hpriv->mmio; 695 int i; 696 697 for (i = 0; i < host->n_ports; i++) { 698 struct ata_port *ap = host->ports[i]; 699 700 /* Disable port interrupts */ 701 if (ap->ops->freeze) 702 ap->ops->freeze(ap); 703 704 /* Stop the port DMA engines */ 705 if (ap->ops->port_stop) 706 ap->ops->port_stop(ap); 707 } 708 709 /* Disable and clear host interrupts */ 710 writel(readl(mmio + HOST_CTL) & ~HOST_IRQ_EN, mmio + HOST_CTL); 711 readl(mmio + HOST_CTL); /* flush */ 712 writel(GENMASK(host->n_ports, 0), mmio + HOST_IRQ_STAT); 713 } 714 EXPORT_SYMBOL_GPL(ahci_platform_shutdown); 715 716 #ifdef CONFIG_PM_SLEEP 717 /** 718 * ahci_platform_suspend_host - Suspend an ahci-platform host 719 * @dev: device pointer for the host 720 * 721 * This function does all the usual steps needed to suspend an 722 * ahci-platform host, note any necessary resources (ie clks, phys, etc.) 723 * must be disabled after calling this. 724 * 725 * RETURNS: 726 * 0 on success otherwise a negative error code 727 */ 728 int ahci_platform_suspend_host(struct device *dev) 729 { 730 struct ata_host *host = dev_get_drvdata(dev); 731 struct ahci_host_priv *hpriv = host->private_data; 732 void __iomem *mmio = hpriv->mmio; 733 u32 ctl; 734 735 if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) { 736 dev_err(dev, "firmware update required for suspend/resume\n"); 737 return -EIO; 738 } 739 740 /* 741 * AHCI spec rev1.1 section 8.3.3: 742 * Software must disable interrupts prior to requesting a 743 * transition of the HBA to D3 state. 744 */ 745 ctl = readl(mmio + HOST_CTL); 746 ctl &= ~HOST_IRQ_EN; 747 writel(ctl, mmio + HOST_CTL); 748 readl(mmio + HOST_CTL); /* flush */ 749 750 if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS) 751 ahci_platform_disable_phys(hpriv); 752 753 return ata_host_suspend(host, PMSG_SUSPEND); 754 } 755 EXPORT_SYMBOL_GPL(ahci_platform_suspend_host); 756 757 /** 758 * ahci_platform_resume_host - Resume an ahci-platform host 759 * @dev: device pointer for the host 760 * 761 * This function does all the usual steps needed to resume an ahci-platform 762 * host, note any necessary resources (ie clks, phys, etc.) must be 763 * initialized / enabled before calling this. 764 * 765 * RETURNS: 766 * 0 on success otherwise a negative error code 767 */ 768 int ahci_platform_resume_host(struct device *dev) 769 { 770 struct ata_host *host = dev_get_drvdata(dev); 771 struct ahci_host_priv *hpriv = host->private_data; 772 int rc; 773 774 if (dev->power.power_state.event == PM_EVENT_SUSPEND) { 775 rc = ahci_reset_controller(host); 776 if (rc) 777 return rc; 778 779 ahci_init_controller(host); 780 } 781 782 if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS) 783 ahci_platform_enable_phys(hpriv); 784 785 ata_host_resume(host); 786 787 return 0; 788 } 789 EXPORT_SYMBOL_GPL(ahci_platform_resume_host); 790 791 /** 792 * ahci_platform_suspend - Suspend an ahci-platform device 793 * @dev: the platform device to suspend 794 * 795 * This function suspends the host associated with the device, followed by 796 * disabling all the resources of the device. 797 * 798 * RETURNS: 799 * 0 on success otherwise a negative error code 800 */ 801 int ahci_platform_suspend(struct device *dev) 802 { 803 struct ata_host *host = dev_get_drvdata(dev); 804 struct ahci_host_priv *hpriv = host->private_data; 805 int rc; 806 807 rc = ahci_platform_suspend_host(dev); 808 if (rc) 809 return rc; 810 811 ahci_platform_disable_resources(hpriv); 812 813 return 0; 814 } 815 EXPORT_SYMBOL_GPL(ahci_platform_suspend); 816 817 /** 818 * ahci_platform_resume - Resume an ahci-platform device 819 * @dev: the platform device to resume 820 * 821 * This function enables all the resources of the device followed by 822 * resuming the host associated with the device. 823 * 824 * RETURNS: 825 * 0 on success otherwise a negative error code 826 */ 827 int ahci_platform_resume(struct device *dev) 828 { 829 struct ata_host *host = dev_get_drvdata(dev); 830 struct ahci_host_priv *hpriv = host->private_data; 831 int rc; 832 833 rc = ahci_platform_enable_resources(hpriv); 834 if (rc) 835 return rc; 836 837 rc = ahci_platform_resume_host(dev); 838 if (rc) 839 goto disable_resources; 840 841 /* We resumed so update PM runtime state */ 842 pm_runtime_disable(dev); 843 pm_runtime_set_active(dev); 844 pm_runtime_enable(dev); 845 846 return 0; 847 848 disable_resources: 849 ahci_platform_disable_resources(hpriv); 850 851 return rc; 852 } 853 EXPORT_SYMBOL_GPL(ahci_platform_resume); 854 #endif 855 856 MODULE_DESCRIPTION("AHCI SATA platform library"); 857 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); 858 MODULE_LICENSE("GPL"); 859