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