2 * AHCI SATA platform library
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>
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)
15 #include <linux/clk.h>
16 #include <linux/kernel.h>
17 #include <linux/gfp.h>
18 #include <linux/module.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>
31 static void ahci_host_stop(struct ata_host *host);
33 struct ata_port_operations ahci_platform_ops = {
34 .inherits = &ahci_ops,
35 .host_stop = ahci_host_stop,
37 EXPORT_SYMBOL_GPL(ahci_platform_ops);
40 * ahci_platform_enable_phys - Enable PHYs
41 * @hpriv: host private area to store config values
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.
48 * 0 on success otherwise a negative error code
50 static int ahci_platform_enable_phys(struct ahci_host_priv *hpriv)
54 for (i = 0; i < hpriv->nports; i++) {
55 rc = phy_init(hpriv->phys[i]);
59 rc = phy_power_on(hpriv->phys[i]);
61 phy_exit(hpriv->phys[i]);
70 phy_power_off(hpriv->phys[i]);
71 phy_exit(hpriv->phys[i]);
77 * ahci_platform_disable_phys - Disable PHYs
78 * @hpriv: host private area to store config values
80 * This function disables all PHYs found in hpriv->phys.
82 static void ahci_platform_disable_phys(struct ahci_host_priv *hpriv)
86 for (i = 0; i < hpriv->nports; i++) {
87 phy_power_off(hpriv->phys[i]);
88 phy_exit(hpriv->phys[i]);
93 * ahci_platform_enable_clks - Enable platform clocks
94 * @hpriv: host private area to store config values
96 * This function enables all the clks found in hpriv->clks, starting at
97 * index 0. If any clk fails to enable it disables all the clks already
98 * enabled in reverse order, and then returns an error.
101 * 0 on success otherwise a negative error code
103 int ahci_platform_enable_clks(struct ahci_host_priv *hpriv)
107 for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) {
108 rc = clk_prepare_enable(hpriv->clks[c]);
110 goto disable_unprepare_clk;
114 disable_unprepare_clk:
116 clk_disable_unprepare(hpriv->clks[c]);
119 EXPORT_SYMBOL_GPL(ahci_platform_enable_clks);
122 * ahci_platform_disable_clks - Disable platform clocks
123 * @hpriv: host private area to store config values
125 * This function disables all the clks found in hpriv->clks, in reverse
126 * order of ahci_platform_enable_clks (starting at the end of the array).
128 void ahci_platform_disable_clks(struct ahci_host_priv *hpriv)
132 for (c = AHCI_MAX_CLKS - 1; c >= 0; c--)
134 clk_disable_unprepare(hpriv->clks[c]);
136 EXPORT_SYMBOL_GPL(ahci_platform_disable_clks);
139 * ahci_platform_enable_regulators - Enable regulators
140 * @hpriv: host private area to store config values
142 * This function enables all the regulators found in controller and
143 * hpriv->target_pwrs, if any. If a regulator fails to be enabled, it
144 * disables all the regulators already enabled in reverse order and
148 * 0 on success otherwise a negative error code
150 int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv)
154 if (hpriv->ahci_regulator) {
155 rc = regulator_enable(hpriv->ahci_regulator);
160 for (i = 0; i < hpriv->nports; i++) {
161 if (!hpriv->target_pwrs[i])
164 rc = regulator_enable(hpriv->target_pwrs[i]);
166 goto disable_target_pwrs;
173 if (hpriv->target_pwrs[i])
174 regulator_disable(hpriv->target_pwrs[i]);
176 if (hpriv->ahci_regulator)
177 regulator_disable(hpriv->ahci_regulator);
180 EXPORT_SYMBOL_GPL(ahci_platform_enable_regulators);
183 * ahci_platform_disable_regulators - Disable regulators
184 * @hpriv: host private area to store config values
186 * This function disables all regulators found in hpriv->target_pwrs and
189 void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv)
193 for (i = 0; i < hpriv->nports; i++) {
194 if (!hpriv->target_pwrs[i])
196 regulator_disable(hpriv->target_pwrs[i]);
199 if (hpriv->ahci_regulator)
200 regulator_disable(hpriv->ahci_regulator);
202 EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators);
204 * ahci_platform_enable_resources - Enable platform resources
205 * @hpriv: host private area to store config values
207 * This function enables all ahci_platform managed resources in the
210 * 2) Clocks (through ahci_platform_enable_clks)
214 * If resource enabling fails at any point the previous enabled resources
215 * are disabled in reverse order.
218 * 0 on success otherwise a negative error code
220 int ahci_platform_enable_resources(struct ahci_host_priv *hpriv)
224 rc = ahci_platform_enable_regulators(hpriv);
228 rc = ahci_platform_enable_clks(hpriv);
230 goto disable_regulator;
232 rc = reset_control_deassert(hpriv->rsts);
236 rc = ahci_platform_enable_phys(hpriv);
243 reset_control_assert(hpriv->rsts);
246 ahci_platform_disable_clks(hpriv);
249 ahci_platform_disable_regulators(hpriv);
253 EXPORT_SYMBOL_GPL(ahci_platform_enable_resources);
256 * ahci_platform_disable_resources - Disable platform resources
257 * @hpriv: host private area to store config values
259 * This function disables all ahci_platform managed resources in the
263 * 3) Clocks (through ahci_platform_disable_clks)
266 void ahci_platform_disable_resources(struct ahci_host_priv *hpriv)
268 ahci_platform_disable_phys(hpriv);
270 reset_control_assert(hpriv->rsts);
272 ahci_platform_disable_clks(hpriv);
274 ahci_platform_disable_regulators(hpriv);
276 EXPORT_SYMBOL_GPL(ahci_platform_disable_resources);
278 static void ahci_platform_put_resources(struct device *dev, void *res)
280 struct ahci_host_priv *hpriv = res;
283 if (hpriv->got_runtime_pm) {
284 pm_runtime_put_sync(dev);
285 pm_runtime_disable(dev);
288 for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++)
289 clk_put(hpriv->clks[c]);
291 * The regulators are tied to child node device and not to the
292 * SATA device itself. So we can't use devm for automatically
293 * releasing them. We have to do it manually here.
295 for (c = 0; c < hpriv->nports; c++)
296 if (hpriv->target_pwrs && hpriv->target_pwrs[c])
297 regulator_put(hpriv->target_pwrs[c]);
299 kfree(hpriv->target_pwrs);
302 static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port,
303 struct device *dev, struct device_node *node)
307 hpriv->phys[port] = devm_of_phy_get(dev, node, NULL);
309 if (!IS_ERR(hpriv->phys[port]))
312 rc = PTR_ERR(hpriv->phys[port]);
315 /* No PHY support. Check if PHY is required. */
316 if (of_find_property(node, "phys", NULL)) {
318 "couldn't get PHY in node %pOFn: ENOSYS\n",
324 /* continue normally */
325 hpriv->phys[port] = NULL;
331 "couldn't get PHY in node %pOFn: %d\n",
340 static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port,
343 struct regulator *target_pwr;
346 target_pwr = regulator_get_optional(dev, "target");
348 if (!IS_ERR(target_pwr))
349 hpriv->target_pwrs[port] = target_pwr;
351 rc = PTR_ERR(target_pwr);
357 * ahci_platform_get_resources - Get platform resources
358 * @pdev: platform device to get resources for
359 * @flags: bitmap representing the resource to get
361 * This function allocates an ahci_host_priv struct, and gets the following
362 * resources, storing a reference to them inside the returned struct:
364 * 1) mmio registers (IORESOURCE_MEM 0, mandatory)
365 * 2) regulator for controlling the targets power (optional)
366 * regulator for controlling the AHCI controller (optional)
367 * 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node,
368 * or for non devicetree enabled platforms a single clock
369 * 4) resets, if flags has AHCI_PLATFORM_GET_RESETS (optional)
373 * The allocated ahci_host_priv on success, otherwise an ERR_PTR value
375 struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,
378 struct device *dev = &pdev->dev;
379 struct ahci_host_priv *hpriv;
381 struct device_node *child;
382 int i, enabled_ports = 0, rc = -ENOMEM, child_nodes;
383 u32 mask_port_map = 0;
385 if (!devres_open_group(dev, NULL, GFP_KERNEL))
386 return ERR_PTR(-ENOMEM);
388 hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv),
393 devres_add(dev, hpriv);
395 hpriv->mmio = devm_ioremap_resource(dev,
396 platform_get_resource(pdev, IORESOURCE_MEM, 0));
397 if (IS_ERR(hpriv->mmio)) {
398 dev_err(dev, "no mmio space\n");
399 rc = PTR_ERR(hpriv->mmio);
403 for (i = 0; i < AHCI_MAX_CLKS; i++) {
405 * For now we must use clk_get(dev, NULL) for the first clock,
406 * because some platforms (da850, spear13xx) are not yet
407 * converted to use devicetree for clocks. For new platforms
408 * this is equivalent to of_clk_get(dev->of_node, 0).
411 clk = clk_get(dev, NULL);
413 clk = of_clk_get(dev->of_node, i);
417 if (rc == -EPROBE_DEFER)
421 hpriv->clks[i] = clk;
424 hpriv->ahci_regulator = devm_regulator_get_optional(dev, "ahci");
425 if (IS_ERR(hpriv->ahci_regulator)) {
426 rc = PTR_ERR(hpriv->ahci_regulator);
427 if (rc == -EPROBE_DEFER)
430 hpriv->ahci_regulator = NULL;
433 if (flags & AHCI_PLATFORM_GET_RESETS) {
434 hpriv->rsts = devm_reset_control_array_get_optional_shared(dev);
435 if (IS_ERR(hpriv->rsts)) {
436 rc = PTR_ERR(hpriv->rsts);
441 hpriv->nports = child_nodes = of_get_child_count(dev->of_node);
444 * If no sub-node was found, we still need to set nports to
445 * one in order to be able to use the
446 * ahci_platform_[en|dis]able_[phys|regulators] functions.
451 hpriv->phys = devm_kcalloc(dev, hpriv->nports, sizeof(*hpriv->phys), GFP_KERNEL);
457 * We cannot use devm_ here, since ahci_platform_put_resources() uses
458 * target_pwrs after devm_ have freed memory
460 hpriv->target_pwrs = kcalloc(hpriv->nports, sizeof(*hpriv->target_pwrs), GFP_KERNEL);
461 if (!hpriv->target_pwrs) {
467 for_each_child_of_node(dev->of_node, child) {
469 struct platform_device *port_dev __maybe_unused;
471 if (!of_device_is_available(child))
474 if (of_property_read_u32(child, "reg", &port)) {
479 if (port >= hpriv->nports) {
480 dev_warn(dev, "invalid port number %d\n", port);
483 mask_port_map |= BIT(port);
485 #ifdef CONFIG_OF_ADDRESS
486 of_platform_device_create(child, NULL, NULL);
488 port_dev = of_find_device_by_node(child);
491 rc = ahci_platform_get_regulator(hpriv, port,
493 if (rc == -EPROBE_DEFER)
498 rc = ahci_platform_get_phy(hpriv, port, dev, child);
504 if (!enabled_ports) {
505 dev_warn(dev, "No port enabled\n");
510 if (!hpriv->mask_port_map)
511 hpriv->mask_port_map = mask_port_map;
514 * If no sub-node was found, keep this for device tree
517 rc = ahci_platform_get_phy(hpriv, 0, dev, dev->of_node);
521 rc = ahci_platform_get_regulator(hpriv, 0, dev);
522 if (rc == -EPROBE_DEFER)
525 pm_runtime_enable(dev);
526 pm_runtime_get_sync(dev);
527 hpriv->got_runtime_pm = true;
529 devres_remove_group(dev, NULL);
533 devres_release_group(dev, NULL);
536 EXPORT_SYMBOL_GPL(ahci_platform_get_resources);
539 * ahci_platform_init_host - Bring up an ahci-platform host
540 * @pdev: platform device pointer for the host
541 * @hpriv: ahci-host private data for the host
542 * @pi_template: template for the ata_port_info to use
543 * @sht: scsi_host_template to use when registering
545 * This function does all the usual steps needed to bring up an
546 * ahci-platform host, note any necessary resources (ie clks, phys, etc.)
547 * must be initialized / enabled before calling this.
550 * 0 on success otherwise a negative error code
552 int ahci_platform_init_host(struct platform_device *pdev,
553 struct ahci_host_priv *hpriv,
554 const struct ata_port_info *pi_template,
555 struct scsi_host_template *sht)
557 struct device *dev = &pdev->dev;
558 struct ata_port_info pi = *pi_template;
559 const struct ata_port_info *ppi[] = { &pi, NULL };
560 struct ata_host *host;
561 int i, irq, n_ports, rc;
563 irq = platform_get_irq(pdev, 0);
565 if (irq != -EPROBE_DEFER)
566 dev_err(dev, "no irq\n");
573 pi.private_data = (void *)(unsigned long)hpriv->flags;
575 ahci_save_initial_config(dev, hpriv);
577 if (hpriv->cap & HOST_CAP_NCQ)
578 pi.flags |= ATA_FLAG_NCQ;
580 if (hpriv->cap & HOST_CAP_PMP)
581 pi.flags |= ATA_FLAG_PMP;
583 ahci_set_em_messages(hpriv, &pi);
585 /* CAP.NP sometimes indicate the index of the last enabled
586 * port, at other times, that of the last possible port, so
587 * determining the maximum port number requires looking at
588 * both CAP.NP and port_map.
590 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
592 host = ata_host_alloc_pinfo(dev, ppi, n_ports);
596 host->private_data = hpriv;
598 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
599 host->flags |= ATA_HOST_PARALLEL_SCAN;
601 dev_info(dev, "SSS flag set, parallel bus scan disabled\n");
603 if (pi.flags & ATA_FLAG_EM)
606 for (i = 0; i < host->n_ports; i++) {
607 struct ata_port *ap = host->ports[i];
609 ata_port_desc(ap, "mmio %pR",
610 platform_get_resource(pdev, IORESOURCE_MEM, 0));
611 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
613 /* set enclosure management message type */
614 if (ap->flags & ATA_FLAG_EM)
615 ap->em_message_type = hpriv->em_msg_type;
617 /* disabled/not-implemented port */
618 if (!(hpriv->port_map & (1 << i)))
619 ap->ops = &ata_dummy_port_ops;
622 if (hpriv->cap & HOST_CAP_64) {
623 rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));
625 rc = dma_coerce_mask_and_coherent(dev,
628 dev_err(dev, "Failed to enable 64-bit DMA.\n");
631 dev_warn(dev, "Enable 32-bit DMA instead of 64-bit.\n");
635 rc = ahci_reset_controller(host);
639 ahci_init_controller(host);
640 ahci_print_info(host, "platform");
642 return ahci_host_activate(host, sht);
644 EXPORT_SYMBOL_GPL(ahci_platform_init_host);
646 static void ahci_host_stop(struct ata_host *host)
648 struct ahci_host_priv *hpriv = host->private_data;
650 ahci_platform_disable_resources(hpriv);
654 * ahci_platform_shutdown - Disable interrupts and stop DMA for host ports
655 * @pdev: platform device pointer for the host
657 * This function is called during system shutdown and performs the minimal
658 * deconfiguration required to ensure that an ahci_platform host cannot
659 * corrupt or otherwise interfere with a new kernel being started with kexec.
661 void ahci_platform_shutdown(struct platform_device *pdev)
663 struct ata_host *host = platform_get_drvdata(pdev);
664 struct ahci_host_priv *hpriv = host->private_data;
665 void __iomem *mmio = hpriv->mmio;
668 for (i = 0; i < host->n_ports; i++) {
669 struct ata_port *ap = host->ports[i];
671 /* Disable port interrupts */
675 /* Stop the port DMA engines */
676 if (ap->ops->port_stop)
677 ap->ops->port_stop(ap);
680 /* Disable and clear host interrupts */
681 writel(readl(mmio + HOST_CTL) & ~HOST_IRQ_EN, mmio + HOST_CTL);
682 readl(mmio + HOST_CTL); /* flush */
683 writel(GENMASK(host->n_ports, 0), mmio + HOST_IRQ_STAT);
685 EXPORT_SYMBOL_GPL(ahci_platform_shutdown);
687 #ifdef CONFIG_PM_SLEEP
689 * ahci_platform_suspend_host - Suspend an ahci-platform host
690 * @dev: device pointer for the host
692 * This function does all the usual steps needed to suspend an
693 * ahci-platform host, note any necessary resources (ie clks, phys, etc.)
694 * must be disabled after calling this.
697 * 0 on success otherwise a negative error code
699 int ahci_platform_suspend_host(struct device *dev)
701 struct ata_host *host = dev_get_drvdata(dev);
702 struct ahci_host_priv *hpriv = host->private_data;
703 void __iomem *mmio = hpriv->mmio;
706 if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
707 dev_err(dev, "firmware update required for suspend/resume\n");
712 * AHCI spec rev1.1 section 8.3.3:
713 * Software must disable interrupts prior to requesting a
714 * transition of the HBA to D3 state.
716 ctl = readl(mmio + HOST_CTL);
718 writel(ctl, mmio + HOST_CTL);
719 readl(mmio + HOST_CTL); /* flush */
721 return ata_host_suspend(host, PMSG_SUSPEND);
723 EXPORT_SYMBOL_GPL(ahci_platform_suspend_host);
726 * ahci_platform_resume_host - Resume an ahci-platform host
727 * @dev: device pointer for the host
729 * This function does all the usual steps needed to resume an ahci-platform
730 * host, note any necessary resources (ie clks, phys, etc.) must be
731 * initialized / enabled before calling this.
734 * 0 on success otherwise a negative error code
736 int ahci_platform_resume_host(struct device *dev)
738 struct ata_host *host = dev_get_drvdata(dev);
741 if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
742 rc = ahci_reset_controller(host);
746 ahci_init_controller(host);
749 ata_host_resume(host);
753 EXPORT_SYMBOL_GPL(ahci_platform_resume_host);
756 * ahci_platform_suspend - Suspend an ahci-platform device
757 * @dev: the platform device to suspend
759 * This function suspends the host associated with the device, followed by
760 * disabling all the resources of the device.
763 * 0 on success otherwise a negative error code
765 int ahci_platform_suspend(struct device *dev)
767 struct ata_host *host = dev_get_drvdata(dev);
768 struct ahci_host_priv *hpriv = host->private_data;
771 rc = ahci_platform_suspend_host(dev);
775 ahci_platform_disable_resources(hpriv);
779 EXPORT_SYMBOL_GPL(ahci_platform_suspend);
782 * ahci_platform_resume - Resume an ahci-platform device
783 * @dev: the platform device to resume
785 * This function enables all the resources of the device followed by
786 * resuming the host associated with the device.
789 * 0 on success otherwise a negative error code
791 int ahci_platform_resume(struct device *dev)
793 struct ata_host *host = dev_get_drvdata(dev);
794 struct ahci_host_priv *hpriv = host->private_data;
797 rc = ahci_platform_enable_resources(hpriv);
801 rc = ahci_platform_resume_host(dev);
803 goto disable_resources;
805 /* We resumed so update PM runtime state */
806 pm_runtime_disable(dev);
807 pm_runtime_set_active(dev);
808 pm_runtime_enable(dev);
813 ahci_platform_disable_resources(hpriv);
817 EXPORT_SYMBOL_GPL(ahci_platform_resume);
820 MODULE_DESCRIPTION("AHCI SATA platform library");
821 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
822 MODULE_LICENSE("GPL");