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