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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * AHCI SATA platform library4 *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.h>24#include <linux/of_platform.h>25#include <linux/reset.h>26#include "ahci.h"27 28static void ahci_host_stop(struct ata_host *host);29 30struct ata_port_operations ahci_platform_ops = {31 .inherits = &ahci_ops,32 .host_stop = ahci_host_stop,33};34EXPORT_SYMBOL_GPL(ahci_platform_ops);35 36/**37 * ahci_platform_enable_phys - Enable PHYs38 * @hpriv: host private area to store config values39 *40 * This function enables all the PHYs found in hpriv->phys, if any.41 * If a PHY fails to be enabled, it disables all the PHYs already42 * enabled in reverse order and returns an error.43 *44 * RETURNS:45 * 0 on success otherwise a negative error code46 */47int ahci_platform_enable_phys(struct ahci_host_priv *hpriv)48{49 int rc, i;50 51 for (i = 0; i < hpriv->nports; i++) {52 rc = phy_init(hpriv->phys[i]);53 if (rc)54 goto disable_phys;55 56 rc = phy_set_mode(hpriv->phys[i], PHY_MODE_SATA);57 if (rc) {58 phy_exit(hpriv->phys[i]);59 goto disable_phys;60 }61 62 rc = phy_power_on(hpriv->phys[i]);63 if (rc) {64 phy_exit(hpriv->phys[i]);65 goto disable_phys;66 }67 }68 69 return 0;70 71disable_phys:72 while (--i >= 0) {73 phy_power_off(hpriv->phys[i]);74 phy_exit(hpriv->phys[i]);75 }76 return rc;77}78EXPORT_SYMBOL_GPL(ahci_platform_enable_phys);79 80/**81 * ahci_platform_disable_phys - Disable PHYs82 * @hpriv: host private area to store config values83 *84 * This function disables all PHYs found in hpriv->phys.85 */86void ahci_platform_disable_phys(struct ahci_host_priv *hpriv)87{88 int i;89 90 for (i = 0; i < hpriv->nports; i++) {91 phy_power_off(hpriv->phys[i]);92 phy_exit(hpriv->phys[i]);93 }94}95EXPORT_SYMBOL_GPL(ahci_platform_disable_phys);96 97/**98 * ahci_platform_find_clk - Find platform clock99 * @hpriv: host private area to store config values100 * @con_id: clock connection ID101 *102 * This function returns a pointer to the clock descriptor of the clock with103 * the passed ID.104 *105 * RETURNS:106 * Pointer to the clock descriptor on success otherwise NULL107 */108struct clk *ahci_platform_find_clk(struct ahci_host_priv *hpriv, const char *con_id)109{110 int i;111 112 for (i = 0; i < hpriv->n_clks; i++) {113 if (hpriv->clks[i].id && !strcmp(hpriv->clks[i].id, con_id))114 return hpriv->clks[i].clk;115 }116 117 return NULL;118}119EXPORT_SYMBOL_GPL(ahci_platform_find_clk);120 121/**122 * ahci_platform_enable_clks - Enable platform clocks123 * @hpriv: host private area to store config values124 *125 * This function enables all the clks found for the AHCI device.126 *127 * RETURNS:128 * 0 on success otherwise a negative error code129 */130int ahci_platform_enable_clks(struct ahci_host_priv *hpriv)131{132 return clk_bulk_prepare_enable(hpriv->n_clks, hpriv->clks);133}134EXPORT_SYMBOL_GPL(ahci_platform_enable_clks);135 136/**137 * ahci_platform_disable_clks - Disable platform clocks138 * @hpriv: host private area to store config values139 *140 * This function disables all the clocks enabled before141 * (bulk-clocks-disable function is supposed to do that in reverse142 * from the enabling procedure order).143 */144void ahci_platform_disable_clks(struct ahci_host_priv *hpriv)145{146 clk_bulk_disable_unprepare(hpriv->n_clks, hpriv->clks);147}148EXPORT_SYMBOL_GPL(ahci_platform_disable_clks);149 150/**151 * ahci_platform_deassert_rsts - Deassert/trigger platform resets152 * @hpriv: host private area to store config values153 *154 * This function deasserts or triggers all the reset lines found for155 * the AHCI device.156 *157 * RETURNS:158 * 0 on success otherwise a negative error code159 */160int ahci_platform_deassert_rsts(struct ahci_host_priv *hpriv)161{162 if (hpriv->f_rsts & AHCI_PLATFORM_RST_TRIGGER)163 return reset_control_reset(hpriv->rsts);164 165 return reset_control_deassert(hpriv->rsts);166}167EXPORT_SYMBOL_GPL(ahci_platform_deassert_rsts);168 169/**170 * ahci_platform_assert_rsts - Assert/rearm platform resets171 * @hpriv: host private area to store config values172 *173 * This function asserts or rearms (for self-deasserting resets) all174 * the reset controls found for the AHCI device.175 *176 * RETURNS:177 * 0 on success otherwise a negative error code178 */179int ahci_platform_assert_rsts(struct ahci_host_priv *hpriv)180{181 if (hpriv->f_rsts & AHCI_PLATFORM_RST_TRIGGER)182 return reset_control_rearm(hpriv->rsts);183 184 return reset_control_assert(hpriv->rsts);185}186EXPORT_SYMBOL_GPL(ahci_platform_assert_rsts);187 188/**189 * ahci_platform_enable_regulators - Enable regulators190 * @hpriv: host private area to store config values191 *192 * This function enables all the regulators found in controller and193 * hpriv->target_pwrs, if any. If a regulator fails to be enabled, it194 * disables all the regulators already enabled in reverse order and195 * returns an error.196 *197 * RETURNS:198 * 0 on success otherwise a negative error code199 */200int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv)201{202 int rc, i;203 204 rc = regulator_enable(hpriv->ahci_regulator);205 if (rc)206 return rc;207 208 rc = regulator_enable(hpriv->phy_regulator);209 if (rc)210 goto disable_ahci_pwrs;211 212 for (i = 0; i < hpriv->nports; i++) {213 if (!hpriv->target_pwrs[i])214 continue;215 216 rc = regulator_enable(hpriv->target_pwrs[i]);217 if (rc)218 goto disable_target_pwrs;219 }220 221 return 0;222 223disable_target_pwrs:224 while (--i >= 0)225 if (hpriv->target_pwrs[i])226 regulator_disable(hpriv->target_pwrs[i]);227 228 regulator_disable(hpriv->phy_regulator);229disable_ahci_pwrs:230 regulator_disable(hpriv->ahci_regulator);231 return rc;232}233EXPORT_SYMBOL_GPL(ahci_platform_enable_regulators);234 235/**236 * ahci_platform_disable_regulators - Disable regulators237 * @hpriv: host private area to store config values238 *239 * This function disables all regulators found in hpriv->target_pwrs and240 * AHCI controller.241 */242void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv)243{244 int i;245 246 for (i = 0; i < hpriv->nports; i++) {247 if (!hpriv->target_pwrs[i])248 continue;249 regulator_disable(hpriv->target_pwrs[i]);250 }251 252 regulator_disable(hpriv->ahci_regulator);253 regulator_disable(hpriv->phy_regulator);254}255EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators);256/**257 * ahci_platform_enable_resources - Enable platform resources258 * @hpriv: host private area to store config values259 *260 * This function enables all ahci_platform managed resources in the261 * following order:262 * 1) Regulator263 * 2) Clocks (through ahci_platform_enable_clks)264 * 3) Resets265 * 4) Phys266 *267 * If resource enabling fails at any point the previous enabled resources268 * are disabled in reverse order.269 *270 * RETURNS:271 * 0 on success otherwise a negative error code272 */273int ahci_platform_enable_resources(struct ahci_host_priv *hpriv)274{275 int rc;276 277 rc = ahci_platform_enable_regulators(hpriv);278 if (rc)279 return rc;280 281 rc = ahci_platform_enable_clks(hpriv);282 if (rc)283 goto disable_regulator;284 285 rc = ahci_platform_deassert_rsts(hpriv);286 if (rc)287 goto disable_clks;288 289 rc = ahci_platform_enable_phys(hpriv);290 if (rc)291 goto disable_rsts;292 293 return 0;294 295disable_rsts:296 ahci_platform_assert_rsts(hpriv);297 298disable_clks:299 ahci_platform_disable_clks(hpriv);300 301disable_regulator:302 ahci_platform_disable_regulators(hpriv);303 304 return rc;305}306EXPORT_SYMBOL_GPL(ahci_platform_enable_resources);307 308/**309 * ahci_platform_disable_resources - Disable platform resources310 * @hpriv: host private area to store config values311 *312 * This function disables all ahci_platform managed resources in the313 * following order:314 * 1) Phys315 * 2) Resets316 * 3) Clocks (through ahci_platform_disable_clks)317 * 4) Regulator318 */319void ahci_platform_disable_resources(struct ahci_host_priv *hpriv)320{321 ahci_platform_disable_phys(hpriv);322 323 ahci_platform_assert_rsts(hpriv);324 325 ahci_platform_disable_clks(hpriv);326 327 ahci_platform_disable_regulators(hpriv);328}329EXPORT_SYMBOL_GPL(ahci_platform_disable_resources);330 331static void ahci_platform_put_resources(struct device *dev, void *res)332{333 struct ahci_host_priv *hpriv = res;334 int c;335 336 if (hpriv->got_runtime_pm) {337 pm_runtime_put_sync(dev);338 pm_runtime_disable(dev);339 }340 341 /*342 * The regulators are tied to child node device and not to the343 * SATA device itself. So we can't use devm for automatically344 * releasing them. We have to do it manually here.345 */346 for (c = 0; c < hpriv->nports; c++)347 if (hpriv->target_pwrs && hpriv->target_pwrs[c])348 regulator_put(hpriv->target_pwrs[c]);349 350 kfree(hpriv->target_pwrs);351}352 353static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port,354 struct device *dev, struct device_node *node)355{356 int rc;357 358 hpriv->phys[port] = devm_of_phy_get(dev, node, NULL);359 360 if (!IS_ERR(hpriv->phys[port]))361 return 0;362 363 rc = PTR_ERR(hpriv->phys[port]);364 switch (rc) {365 case -ENOSYS:366 /* No PHY support. Check if PHY is required. */367 if (of_property_present(node, "phys")) {368 dev_err(dev,369 "couldn't get PHY in node %pOFn: ENOSYS\n",370 node);371 break;372 }373 fallthrough;374 case -ENODEV:375 /* continue normally */376 hpriv->phys[port] = NULL;377 rc = 0;378 break;379 case -EPROBE_DEFER:380 /* Do not complain yet */381 break;382 383 default:384 dev_err(dev,385 "couldn't get PHY in node %pOFn: %d\n",386 node, rc);387 388 break;389 }390 391 return rc;392}393 394static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port,395 struct device *dev)396{397 struct regulator *target_pwr;398 int rc = 0;399 400 target_pwr = regulator_get(dev, "target");401 402 if (!IS_ERR(target_pwr))403 hpriv->target_pwrs[port] = target_pwr;404 else405 rc = PTR_ERR(target_pwr);406 407 return rc;408}409 410static int ahci_platform_get_firmware(struct ahci_host_priv *hpriv,411 struct device *dev)412{413 u32 port;414 415 if (!of_property_read_u32(dev->of_node, "hba-cap", &hpriv->saved_cap))416 hpriv->saved_cap &= (HOST_CAP_SSS | HOST_CAP_MPS);417 418 of_property_read_u32(dev->of_node,419 "ports-implemented", &hpriv->saved_port_map);420 421 for_each_child_of_node_scoped(dev->of_node, child) {422 if (!of_device_is_available(child))423 continue;424 425 if (of_property_read_u32(child, "reg", &port))426 return -EINVAL;427 428 if (!of_property_read_u32(child, "hba-port-cap", &hpriv->saved_port_cap[port]))429 hpriv->saved_port_cap[port] &= PORT_CMD_CAP;430 }431 432 return 0;433}434 435/**436 * ahci_platform_get_resources - Get platform resources437 * @pdev: platform device to get resources for438 * @flags: bitmap representing the resource to get439 *440 * This function allocates an ahci_host_priv struct, and gets the following441 * resources, storing a reference to them inside the returned struct:442 *443 * 1) mmio registers (IORESOURCE_MEM 0, mandatory)444 * 2) regulator for controlling the targets power (optional)445 * regulator for controlling the AHCI controller (optional)446 * 3) all clocks specified in the devicetree node, or a single447 * clock for non-OF platforms (optional)448 * 4) resets, if flags has AHCI_PLATFORM_GET_RESETS (optional)449 * 5) phys (optional)450 *451 * RETURNS:452 * The allocated ahci_host_priv on success, otherwise an ERR_PTR value453 */454struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,455 unsigned int flags)456{457 int child_nodes, rc = -ENOMEM, enabled_ports = 0;458 struct device *dev = &pdev->dev;459 struct ahci_host_priv *hpriv;460 u32 mask_port_map = 0;461 462 if (!devres_open_group(dev, NULL, GFP_KERNEL))463 return ERR_PTR(-ENOMEM);464 465 hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv),466 GFP_KERNEL);467 if (!hpriv)468 goto err_out;469 470 devres_add(dev, hpriv);471 472 /*473 * If the DT provided an "ahci" named resource, use it. Otherwise,474 * fallback to using the default first resource for the device node.475 */476 if (platform_get_resource_byname(pdev, IORESOURCE_MEM, "ahci"))477 hpriv->mmio = devm_platform_ioremap_resource_byname(pdev, "ahci");478 else479 hpriv->mmio = devm_platform_ioremap_resource(pdev, 0);480 if (IS_ERR(hpriv->mmio)) {481 rc = PTR_ERR(hpriv->mmio);482 goto err_out;483 }484 485 /*486 * Bulk clocks getting procedure can fail to find any clock due to487 * running on a non-OF platform or due to the clocks being defined in488 * bypass of the DT firmware (like da850, spear13xx). In that case we489 * fallback to getting a single clock source right from the dev clocks490 * list.491 */492 rc = devm_clk_bulk_get_all(dev, &hpriv->clks);493 if (rc < 0)494 goto err_out;495 496 if (rc > 0) {497 /* Got clocks in bulk */498 hpriv->n_clks = rc;499 } else {500 /*501 * No clock bulk found: fallback to manually getting502 * the optional clock.503 */504 hpriv->clks = devm_kzalloc(dev, sizeof(*hpriv->clks), GFP_KERNEL);505 if (!hpriv->clks) {506 rc = -ENOMEM;507 goto err_out;508 }509 hpriv->clks->clk = devm_clk_get_optional(dev, NULL);510 if (IS_ERR(hpriv->clks->clk)) {511 rc = PTR_ERR(hpriv->clks->clk);512 goto err_out;513 } else if (hpriv->clks->clk) {514 hpriv->clks->id = "ahci";515 hpriv->n_clks = 1;516 }517 }518 519 hpriv->ahci_regulator = devm_regulator_get(dev, "ahci");520 if (IS_ERR(hpriv->ahci_regulator)) {521 rc = PTR_ERR(hpriv->ahci_regulator);522 if (rc != 0)523 goto err_out;524 }525 526 hpriv->phy_regulator = devm_regulator_get(dev, "phy");527 if (IS_ERR(hpriv->phy_regulator)) {528 rc = PTR_ERR(hpriv->phy_regulator);529 goto err_out;530 }531 532 if (flags & AHCI_PLATFORM_GET_RESETS) {533 hpriv->rsts = devm_reset_control_array_get_optional_shared(dev);534 if (IS_ERR(hpriv->rsts)) {535 rc = PTR_ERR(hpriv->rsts);536 goto err_out;537 }538 539 hpriv->f_rsts = flags & AHCI_PLATFORM_RST_TRIGGER;540 }541 542 /*543 * Too many sub-nodes most likely means having something wrong with544 * the firmware.545 */546 child_nodes = of_get_child_count(dev->of_node);547 if (child_nodes > AHCI_MAX_PORTS) {548 rc = -EINVAL;549 goto err_out;550 }551 552 /*553 * If no sub-node was found, we still need to set nports to554 * one in order to be able to use the555 * ahci_platform_[en|dis]able_[phys|regulators] functions.556 */557 if (child_nodes)558 hpriv->nports = child_nodes;559 else560 hpriv->nports = 1;561 562 hpriv->phys = devm_kcalloc(dev, hpriv->nports, sizeof(*hpriv->phys), GFP_KERNEL);563 if (!hpriv->phys) {564 rc = -ENOMEM;565 goto err_out;566 }567 /*568 * We cannot use devm_ here, since ahci_platform_put_resources() uses569 * target_pwrs after devm_ have freed memory570 */571 hpriv->target_pwrs = kcalloc(hpriv->nports, sizeof(*hpriv->target_pwrs), GFP_KERNEL);572 if (!hpriv->target_pwrs) {573 rc = -ENOMEM;574 goto err_out;575 }576 577 if (child_nodes) {578 for_each_child_of_node_scoped(dev->of_node, child) {579 u32 port;580 struct platform_device *port_dev __maybe_unused;581 582 if (!of_device_is_available(child))583 continue;584 585 if (of_property_read_u32(child, "reg", &port)) {586 rc = -EINVAL;587 goto err_out;588 }589 590 if (port >= hpriv->nports) {591 dev_warn(dev, "invalid port number %d\n", port);592 continue;593 }594 mask_port_map |= BIT(port);595 596#ifdef CONFIG_OF_ADDRESS597 of_platform_device_create(child, NULL, NULL);598 599 port_dev = of_find_device_by_node(child);600 601 if (port_dev) {602 rc = ahci_platform_get_regulator(hpriv, port,603 &port_dev->dev);604 if (rc == -EPROBE_DEFER)605 goto err_out;606 }607#endif608 609 rc = ahci_platform_get_phy(hpriv, port, dev, child);610 if (rc)611 goto err_out;612 613 enabled_ports++;614 }615 if (!enabled_ports) {616 dev_warn(dev, "No port enabled\n");617 rc = -ENODEV;618 goto err_out;619 }620 621 if (!hpriv->mask_port_map)622 hpriv->mask_port_map = mask_port_map;623 } else {624 /*625 * If no sub-node was found, keep this for device tree626 * compatibility627 */628 rc = ahci_platform_get_phy(hpriv, 0, dev, dev->of_node);629 if (rc)630 goto err_out;631 632 rc = ahci_platform_get_regulator(hpriv, 0, dev);633 if (rc == -EPROBE_DEFER)634 goto err_out;635 }636 637 /*638 * Retrieve firmware-specific flags which then will be used to set639 * the HW-init fields of HBA and its ports640 */641 rc = ahci_platform_get_firmware(hpriv, dev);642 if (rc)643 goto err_out;644 645 pm_runtime_enable(dev);646 pm_runtime_get_sync(dev);647 hpriv->got_runtime_pm = true;648 649 devres_remove_group(dev, NULL);650 return hpriv;651 652err_out:653 devres_release_group(dev, NULL);654 return ERR_PTR(rc);655}656EXPORT_SYMBOL_GPL(ahci_platform_get_resources);657 658/**659 * ahci_platform_init_host - Bring up an ahci-platform host660 * @pdev: platform device pointer for the host661 * @hpriv: ahci-host private data for the host662 * @pi_template: template for the ata_port_info to use663 * @sht: scsi_host_template to use when registering664 *665 * This function does all the usual steps needed to bring up an666 * ahci-platform host, note any necessary resources (ie clks, phys, etc.)667 * must be initialized / enabled before calling this.668 *669 * RETURNS:670 * 0 on success otherwise a negative error code671 */672int ahci_platform_init_host(struct platform_device *pdev,673 struct ahci_host_priv *hpriv,674 const struct ata_port_info *pi_template,675 const struct scsi_host_template *sht)676{677 struct device *dev = &pdev->dev;678 struct ata_port_info pi = *pi_template;679 const struct ata_port_info *ppi[] = { &pi, NULL };680 struct ata_host *host;681 int i, irq, n_ports, rc;682 683 irq = platform_get_irq(pdev, 0);684 if (irq < 0)685 return irq;686 if (!irq)687 return -EINVAL;688 689 hpriv->irq = irq;690 691 /* prepare host */692 pi.private_data = (void *)(unsigned long)hpriv->flags;693 694 ahci_save_initial_config(dev, hpriv);695 696 if (hpriv->cap & HOST_CAP_NCQ)697 pi.flags |= ATA_FLAG_NCQ;698 699 if (hpriv->cap & HOST_CAP_PMP)700 pi.flags |= ATA_FLAG_PMP;701 702 ahci_set_em_messages(hpriv, &pi);703 704 /* CAP.NP sometimes indicate the index of the last enabled705 * port, at other times, that of the last possible port, so706 * determining the maximum port number requires looking at707 * both CAP.NP and port_map.708 */709 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));710 711 host = ata_host_alloc_pinfo(dev, ppi, n_ports);712 if (!host)713 return -ENOMEM;714 715 host->private_data = hpriv;716 717 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)718 host->flags |= ATA_HOST_PARALLEL_SCAN;719 else720 dev_info(dev, "SSS flag set, parallel bus scan disabled\n");721 722 if (pi.flags & ATA_FLAG_EM)723 ahci_reset_em(host);724 725 for (i = 0; i < host->n_ports; i++) {726 struct ata_port *ap = host->ports[i];727 728 ata_port_desc(ap, "mmio %pR",729 platform_get_resource(pdev, IORESOURCE_MEM, 0));730 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);731 732 /* set enclosure management message type */733 if (ap->flags & ATA_FLAG_EM)734 ap->em_message_type = hpriv->em_msg_type;735 736 /* disabled/not-implemented port */737 if (!(hpriv->port_map & (1 << i)))738 ap->ops = &ata_dummy_port_ops;739 }740 741 if (hpriv->cap & HOST_CAP_64) {742 rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));743 if (rc) {744 dev_err(dev, "Failed to enable 64-bit DMA.\n");745 return rc;746 }747 }748 749 rc = ahci_reset_controller(host);750 if (rc)751 return rc;752 753 ahci_init_controller(host);754 ahci_print_info(host, "platform");755 756 return ahci_host_activate(host, sht);757}758EXPORT_SYMBOL_GPL(ahci_platform_init_host);759 760static void ahci_host_stop(struct ata_host *host)761{762 struct ahci_host_priv *hpriv = host->private_data;763 764 ahci_platform_disable_resources(hpriv);765}766 767/**768 * ahci_platform_shutdown - Disable interrupts and stop DMA for host ports769 * @pdev: platform device pointer for the host770 *771 * This function is called during system shutdown and performs the minimal772 * deconfiguration required to ensure that an ahci_platform host cannot773 * corrupt or otherwise interfere with a new kernel being started with kexec.774 */775void ahci_platform_shutdown(struct platform_device *pdev)776{777 struct ata_host *host = platform_get_drvdata(pdev);778 struct ahci_host_priv *hpriv = host->private_data;779 void __iomem *mmio = hpriv->mmio;780 int i;781 782 for (i = 0; i < host->n_ports; i++) {783 struct ata_port *ap = host->ports[i];784 785 /* Disable port interrupts */786 if (ap->ops->freeze)787 ap->ops->freeze(ap);788 789 /* Stop the port DMA engines */790 if (ap->ops->port_stop)791 ap->ops->port_stop(ap);792 }793 794 /* Disable and clear host interrupts */795 writel(readl(mmio + HOST_CTL) & ~HOST_IRQ_EN, mmio + HOST_CTL);796 readl(mmio + HOST_CTL); /* flush */797 writel(GENMASK(host->n_ports, 0), mmio + HOST_IRQ_STAT);798}799EXPORT_SYMBOL_GPL(ahci_platform_shutdown);800 801#ifdef CONFIG_PM_SLEEP802/**803 * ahci_platform_suspend_host - Suspend an ahci-platform host804 * @dev: device pointer for the host805 *806 * This function does all the usual steps needed to suspend an807 * ahci-platform host, note any necessary resources (ie clks, phys, etc.)808 * must be disabled after calling this.809 *810 * RETURNS:811 * 0 on success otherwise a negative error code812 */813int ahci_platform_suspend_host(struct device *dev)814{815 struct ata_host *host = dev_get_drvdata(dev);816 struct ahci_host_priv *hpriv = host->private_data;817 void __iomem *mmio = hpriv->mmio;818 u32 ctl;819 820 if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {821 dev_err(dev, "firmware update required for suspend/resume\n");822 return -EIO;823 }824 825 /*826 * AHCI spec rev1.1 section 8.3.3:827 * Software must disable interrupts prior to requesting a828 * transition of the HBA to D3 state.829 */830 ctl = readl(mmio + HOST_CTL);831 ctl &= ~HOST_IRQ_EN;832 writel(ctl, mmio + HOST_CTL);833 readl(mmio + HOST_CTL); /* flush */834 835 if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS)836 ahci_platform_disable_phys(hpriv);837 838 ata_host_suspend(host, PMSG_SUSPEND);839 return 0;840}841EXPORT_SYMBOL_GPL(ahci_platform_suspend_host);842 843/**844 * ahci_platform_resume_host - Resume an ahci-platform host845 * @dev: device pointer for the host846 *847 * This function does all the usual steps needed to resume an ahci-platform848 * host, note any necessary resources (ie clks, phys, etc.) must be849 * initialized / enabled before calling this.850 *851 * RETURNS:852 * 0 on success otherwise a negative error code853 */854int ahci_platform_resume_host(struct device *dev)855{856 struct ata_host *host = dev_get_drvdata(dev);857 struct ahci_host_priv *hpriv = host->private_data;858 int rc;859 860 if (dev->power.power_state.event == PM_EVENT_SUSPEND) {861 rc = ahci_reset_controller(host);862 if (rc)863 return rc;864 865 ahci_init_controller(host);866 }867 868 if (hpriv->flags & AHCI_HFLAG_SUSPEND_PHYS)869 ahci_platform_enable_phys(hpriv);870 871 ata_host_resume(host);872 873 return 0;874}875EXPORT_SYMBOL_GPL(ahci_platform_resume_host);876 877/**878 * ahci_platform_suspend - Suspend an ahci-platform device879 * @dev: the platform device to suspend880 *881 * This function suspends the host associated with the device, followed by882 * disabling all the resources of the device.883 *884 * RETURNS:885 * 0 on success otherwise a negative error code886 */887int ahci_platform_suspend(struct device *dev)888{889 struct ata_host *host = dev_get_drvdata(dev);890 struct ahci_host_priv *hpriv = host->private_data;891 int rc;892 893 rc = ahci_platform_suspend_host(dev);894 if (rc)895 return rc;896 897 ahci_platform_disable_resources(hpriv);898 899 return 0;900}901EXPORT_SYMBOL_GPL(ahci_platform_suspend);902 903/**904 * ahci_platform_resume - Resume an ahci-platform device905 * @dev: the platform device to resume906 *907 * This function enables all the resources of the device followed by908 * resuming the host associated with the device.909 *910 * RETURNS:911 * 0 on success otherwise a negative error code912 */913int ahci_platform_resume(struct device *dev)914{915 struct ata_host *host = dev_get_drvdata(dev);916 struct ahci_host_priv *hpriv = host->private_data;917 int rc;918 919 rc = ahci_platform_enable_resources(hpriv);920 if (rc)921 return rc;922 923 rc = ahci_platform_resume_host(dev);924 if (rc)925 goto disable_resources;926 927 /* We resumed so update PM runtime state */928 pm_runtime_disable(dev);929 pm_runtime_set_active(dev);930 pm_runtime_enable(dev);931 932 return 0;933 934disable_resources:935 ahci_platform_disable_resources(hpriv);936 937 return rc;938}939EXPORT_SYMBOL_GPL(ahci_platform_resume);940#endif941 942MODULE_DESCRIPTION("AHCI SATA platform library");943MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");944MODULE_LICENSE("GPL");945