/* * AHCI SATA platform library * * Copyright 2004-2005 Red Hat, Inc. * Jeff Garzik * Copyright 2010 MontaVista Software, LLC. * Anton Vorontsov * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ahci.h" static void ahci_host_stop(struct ata_host *host); struct ata_port_operations ahci_platform_ops = { .inherits = &ahci_ops, .host_stop = ahci_host_stop, }; EXPORT_SYMBOL_GPL(ahci_platform_ops); /** * ahci_platform_enable_phys - Enable PHYs * @hpriv: host private area to store config values * * This function enables all the PHYs found in hpriv->phys, if any. * If a PHY fails to be enabled, it disables all the PHYs already * enabled in reverse order and returns an error. * * RETURNS: * 0 on success otherwise a negative error code */ static int ahci_platform_enable_phys(struct ahci_host_priv *hpriv) { int rc, i; for (i = 0; i < hpriv->nports; i++) { rc = phy_init(hpriv->phys[i]); if (rc) goto disable_phys; rc = phy_power_on(hpriv->phys[i]); if (rc) { phy_exit(hpriv->phys[i]); goto disable_phys; } } return 0; disable_phys: while (--i >= 0) { phy_power_off(hpriv->phys[i]); phy_exit(hpriv->phys[i]); } return rc; } /** * ahci_platform_disable_phys - Disable PHYs * @hpriv: host private area to store config values * * This function disables all PHYs found in hpriv->phys. */ static void ahci_platform_disable_phys(struct ahci_host_priv *hpriv) { int i; for (i = 0; i < hpriv->nports; i++) { phy_power_off(hpriv->phys[i]); phy_exit(hpriv->phys[i]); } } /** * ahci_platform_enable_clks - Enable platform clocks * @hpriv: host private area to store config values * * This function enables all the clks found in hpriv->clks, starting at * index 0. If any clk fails to enable it disables all the clks already * enabled in reverse order, and then returns an error. * * RETURNS: * 0 on success otherwise a negative error code */ int ahci_platform_enable_clks(struct ahci_host_priv *hpriv) { int c, rc; for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) { rc = clk_prepare_enable(hpriv->clks[c]); if (rc) goto disable_unprepare_clk; } return 0; disable_unprepare_clk: while (--c >= 0) clk_disable_unprepare(hpriv->clks[c]); return rc; } EXPORT_SYMBOL_GPL(ahci_platform_enable_clks); /** * ahci_platform_disable_clks - Disable platform clocks * @hpriv: host private area to store config values * * This function disables all the clks found in hpriv->clks, in reverse * order of ahci_platform_enable_clks (starting at the end of the array). */ void ahci_platform_disable_clks(struct ahci_host_priv *hpriv) { int c; for (c = AHCI_MAX_CLKS - 1; c >= 0; c--) if (hpriv->clks[c]) clk_disable_unprepare(hpriv->clks[c]); } EXPORT_SYMBOL_GPL(ahci_platform_disable_clks); /** * ahci_platform_enable_regulators - Enable regulators * @hpriv: host private area to store config values * * This function enables all the regulators found in * hpriv->target_pwrs, if any. If a regulator fails to be enabled, it * disables all the regulators already enabled in reverse order and * returns an error. * * RETURNS: * 0 on success otherwise a negative error code */ int ahci_platform_enable_regulators(struct ahci_host_priv *hpriv) { int rc, i; for (i = 0; i < hpriv->nports; i++) { if (!hpriv->target_pwrs[i]) continue; rc = regulator_enable(hpriv->target_pwrs[i]); if (rc) goto disable_target_pwrs; } return 0; disable_target_pwrs: while (--i >= 0) if (hpriv->target_pwrs[i]) regulator_disable(hpriv->target_pwrs[i]); return rc; } EXPORT_SYMBOL_GPL(ahci_platform_enable_regulators); /** * ahci_platform_disable_regulators - Disable regulators * @hpriv: host private area to store config values * * This function disables all regulators found in hpriv->target_pwrs. */ void ahci_platform_disable_regulators(struct ahci_host_priv *hpriv) { int i; for (i = 0; i < hpriv->nports; i++) { if (!hpriv->target_pwrs[i]) continue; regulator_disable(hpriv->target_pwrs[i]); } } EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators); /** * ahci_platform_enable_resources - Enable platform resources * @hpriv: host private area to store config values * * This function enables all ahci_platform managed resources in the * following order: * 1) Regulator * 2) Clocks (through ahci_platform_enable_clks) * 3) Resets * 4) Phys * * If resource enabling fails at any point the previous enabled resources * are disabled in reverse order. * * RETURNS: * 0 on success otherwise a negative error code */ int ahci_platform_enable_resources(struct ahci_host_priv *hpriv) { int rc; rc = ahci_platform_enable_regulators(hpriv); if (rc) return rc; rc = ahci_platform_enable_clks(hpriv); if (rc) goto disable_regulator; rc = reset_control_deassert(hpriv->rsts); if (rc) goto disable_clks; rc = ahci_platform_enable_phys(hpriv); if (rc) goto disable_resets; return 0; disable_resets: reset_control_assert(hpriv->rsts); disable_clks: ahci_platform_disable_clks(hpriv); disable_regulator: ahci_platform_disable_regulators(hpriv); return rc; } EXPORT_SYMBOL_GPL(ahci_platform_enable_resources); /** * ahci_platform_disable_resources - Disable platform resources * @hpriv: host private area to store config values * * This function disables all ahci_platform managed resources in the * following order: * 1) Phys * 2) Resets * 3) Clocks (through ahci_platform_disable_clks) * 4) Regulator */ void ahci_platform_disable_resources(struct ahci_host_priv *hpriv) { ahci_platform_disable_phys(hpriv); reset_control_assert(hpriv->rsts); ahci_platform_disable_clks(hpriv); ahci_platform_disable_regulators(hpriv); } EXPORT_SYMBOL_GPL(ahci_platform_disable_resources); static void ahci_platform_put_resources(struct device *dev, void *res) { struct ahci_host_priv *hpriv = res; int c; if (hpriv->got_runtime_pm) { pm_runtime_put_sync(dev); pm_runtime_disable(dev); } for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) clk_put(hpriv->clks[c]); /* * The regulators are tied to child node device and not to the * SATA device itself. So we can't use devm for automatically * releasing them. We have to do it manually here. */ for (c = 0; c < hpriv->nports; c++) if (hpriv->target_pwrs && hpriv->target_pwrs[c]) regulator_put(hpriv->target_pwrs[c]); kfree(hpriv->target_pwrs); } static int ahci_platform_get_phy(struct ahci_host_priv *hpriv, u32 port, struct device *dev, struct device_node *node) { int rc; hpriv->phys[port] = devm_of_phy_get(dev, node, NULL); if (!IS_ERR(hpriv->phys[port])) return 0; rc = PTR_ERR(hpriv->phys[port]); switch (rc) { case -ENOSYS: /* No PHY support. Check if PHY is required. */ if (of_find_property(node, "phys", NULL)) { dev_err(dev, "couldn't get PHY in node %s: ENOSYS\n", node->name); break; } /* fall through */ case -ENODEV: /* continue normally */ hpriv->phys[port] = NULL; rc = 0; break; case -EPROBE_DEFER: /* Do not complain yet */ break; default: dev_err(dev, "couldn't get PHY in node %s: %d\n", node->name, rc); break; } return rc; } static int ahci_platform_get_regulator(struct ahci_host_priv *hpriv, u32 port, struct device *dev) { struct regulator *target_pwr; int rc = 0; target_pwr = regulator_get_optional(dev, "target"); if (!IS_ERR(target_pwr)) hpriv->target_pwrs[port] = target_pwr; else rc = PTR_ERR(target_pwr); return rc; } /** * ahci_platform_get_resources - Get platform resources * @pdev: platform device to get resources for * @flags: bitmap representing the resource to get * * This function allocates an ahci_host_priv struct, and gets the following * resources, storing a reference to them inside the returned struct: * * 1) mmio registers (IORESOURCE_MEM 0, mandatory) * 2) regulator for controlling the targets power (optional) * 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node, * or for non devicetree enabled platforms a single clock * 4) resets, if flags has AHCI_PLATFORM_GET_RESETS (optional) * 5) phys (optional) * * RETURNS: * The allocated ahci_host_priv on success, otherwise an ERR_PTR value */ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev, unsigned int flags) { struct device *dev = &pdev->dev; struct ahci_host_priv *hpriv; struct clk *clk; struct device_node *child; int i, enabled_ports = 0, rc = -ENOMEM, child_nodes; u32 mask_port_map = 0; if (!devres_open_group(dev, NULL, GFP_KERNEL)) return ERR_PTR(-ENOMEM); hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv), GFP_KERNEL); if (!hpriv) goto err_out; devres_add(dev, hpriv); hpriv->mmio = devm_ioremap_resource(dev, platform_get_resource(pdev, IORESOURCE_MEM, 0)); if (IS_ERR(hpriv->mmio)) { dev_err(dev, "no mmio space\n"); rc = PTR_ERR(hpriv->mmio); goto err_out; } for (i = 0; i < AHCI_MAX_CLKS; i++) { /* * For now we must use clk_get(dev, NULL) for the first clock, * because some platforms (da850, spear13xx) are not yet * converted to use devicetree for clocks. For new platforms * this is equivalent to of_clk_get(dev->of_node, 0). */ if (i == 0) clk = clk_get(dev, NULL); else clk = of_clk_get(dev->of_node, i); if (IS_ERR(clk)) { rc = PTR_ERR(clk); if (rc == -EPROBE_DEFER) goto err_out; break; } hpriv->clks[i] = clk; } if (flags & AHCI_PLATFORM_GET_RESETS) { hpriv->rsts = devm_reset_control_array_get_optional_shared(dev); if (IS_ERR(hpriv->rsts)) { rc = PTR_ERR(hpriv->rsts); goto err_out; } } hpriv->nports = child_nodes = of_get_child_count(dev->of_node); /* * If no sub-node was found, we still need to set nports to * one in order to be able to use the * ahci_platform_[en|dis]able_[phys|regulators] functions. */ if (!child_nodes) hpriv->nports = 1; hpriv->phys = devm_kcalloc(dev, hpriv->nports, sizeof(*hpriv->phys), GFP_KERNEL); if (!hpriv->phys) { rc = -ENOMEM; goto err_out; } /* * We cannot use devm_ here, since ahci_platform_put_resources() uses * target_pwrs after devm_ have freed memory */ hpriv->target_pwrs = kcalloc(hpriv->nports, sizeof(*hpriv->target_pwrs), GFP_KERNEL); if (!hpriv->target_pwrs) { rc = -ENOMEM; goto err_out; } if (child_nodes) { for_each_child_of_node(dev->of_node, child) { u32 port; struct platform_device *port_dev __maybe_unused; if (!of_device_is_available(child)) continue; if (of_property_read_u32(child, "reg", &port)) { rc = -EINVAL; goto err_out; } if (port >= hpriv->nports) { dev_warn(dev, "invalid port number %d\n", port); continue; } mask_port_map |= BIT(port); #ifdef CONFIG_OF_ADDRESS of_platform_device_create(child, NULL, NULL); port_dev = of_find_device_by_node(child); if (port_dev) { rc = ahci_platform_get_regulator(hpriv, port, &port_dev->dev); if (rc == -EPROBE_DEFER) goto err_out; } #endif rc = ahci_platform_get_phy(hpriv, port, dev, child); if (rc) goto err_out; enabled_ports++; } if (!enabled_ports) { dev_warn(dev, "No port enabled\n"); rc = -ENODEV; goto err_out; } if (!hpriv->mask_port_map) hpriv->mask_port_map = mask_port_map; } else { /* * If no sub-node was found, keep this for device tree * compatibility */ rc = ahci_platform_get_phy(hpriv, 0, dev, dev->of_node); if (rc) goto err_out; rc = ahci_platform_get_regulator(hpriv, 0, dev); if (rc == -EPROBE_DEFER) goto err_out; } pm_runtime_enable(dev); pm_runtime_get_sync(dev); hpriv->got_runtime_pm = true; devres_remove_group(dev, NULL); return hpriv; err_out: devres_release_group(dev, NULL); return ERR_PTR(rc); } EXPORT_SYMBOL_GPL(ahci_platform_get_resources); /** * ahci_platform_init_host - Bring up an ahci-platform host * @pdev: platform device pointer for the host * @hpriv: ahci-host private data for the host * @pi_template: template for the ata_port_info to use * @sht: scsi_host_template to use when registering * * This function does all the usual steps needed to bring up an * ahci-platform host, note any necessary resources (ie clks, phys, etc.) * must be initialized / enabled before calling this. * * RETURNS: * 0 on success otherwise a negative error code */ int ahci_platform_init_host(struct platform_device *pdev, struct ahci_host_priv *hpriv, const struct ata_port_info *pi_template, struct scsi_host_template *sht) { struct device *dev = &pdev->dev; struct ata_port_info pi = *pi_template; const struct ata_port_info *ppi[] = { &pi, NULL }; struct ata_host *host; int i, irq, n_ports, rc; irq = platform_get_irq(pdev, 0); if (irq <= 0) { if (irq != -EPROBE_DEFER) dev_err(dev, "no irq\n"); return irq; } hpriv->irq = irq; /* prepare host */ pi.private_data = (void *)(unsigned long)hpriv->flags; ahci_save_initial_config(dev, hpriv); if (hpriv->cap & HOST_CAP_NCQ) pi.flags |= ATA_FLAG_NCQ; if (hpriv->cap & HOST_CAP_PMP) pi.flags |= ATA_FLAG_PMP; ahci_set_em_messages(hpriv, &pi); /* CAP.NP sometimes indicate the index of the last enabled * port, at other times, that of the last possible port, so * determining the maximum port number requires looking at * both CAP.NP and port_map. */ n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map)); host = ata_host_alloc_pinfo(dev, ppi, n_ports); if (!host) return -ENOMEM; host->private_data = hpriv; if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss) host->flags |= ATA_HOST_PARALLEL_SCAN; else dev_info(dev, "SSS flag set, parallel bus scan disabled\n"); if (pi.flags & ATA_FLAG_EM) ahci_reset_em(host); for (i = 0; i < host->n_ports; i++) { struct ata_port *ap = host->ports[i]; ata_port_desc(ap, "mmio %pR", platform_get_resource(pdev, IORESOURCE_MEM, 0)); ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80); /* set enclosure management message type */ if (ap->flags & ATA_FLAG_EM) ap->em_message_type = hpriv->em_msg_type; /* disabled/not-implemented port */ if (!(hpriv->port_map & (1 << i))) ap->ops = &ata_dummy_port_ops; } if (hpriv->cap & HOST_CAP_64) { rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64)); if (rc) { rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32)); if (rc) { dev_err(dev, "Failed to enable 64-bit DMA.\n"); return rc; } dev_warn(dev, "Enable 32-bit DMA instead of 64-bit.\n"); } } rc = ahci_reset_controller(host); if (rc) return rc; ahci_init_controller(host); ahci_print_info(host, "platform"); return ahci_host_activate(host, sht); } EXPORT_SYMBOL_GPL(ahci_platform_init_host); static void ahci_host_stop(struct ata_host *host) { struct ahci_host_priv *hpriv = host->private_data; ahci_platform_disable_resources(hpriv); } /** * ahci_platform_shutdown - Disable interrupts and stop DMA for host ports * @pdev: platform device pointer for the host * * This function is called during system shutdown and performs the minimal * deconfiguration required to ensure that an ahci_platform host cannot * corrupt or otherwise interfere with a new kernel being started with kexec. */ void ahci_platform_shutdown(struct platform_device *pdev) { struct ata_host *host = platform_get_drvdata(pdev); struct ahci_host_priv *hpriv = host->private_data; void __iomem *mmio = hpriv->mmio; int i; for (i = 0; i < host->n_ports; i++) { struct ata_port *ap = host->ports[i]; /* Disable port interrupts */ if (ap->ops->freeze) ap->ops->freeze(ap); /* Stop the port DMA engines */ if (ap->ops->port_stop) ap->ops->port_stop(ap); } /* Disable and clear host interrupts */ writel(readl(mmio + HOST_CTL) & ~HOST_IRQ_EN, mmio + HOST_CTL); readl(mmio + HOST_CTL); /* flush */ writel(GENMASK(host->n_ports, 0), mmio + HOST_IRQ_STAT); } EXPORT_SYMBOL_GPL(ahci_platform_shutdown); #ifdef CONFIG_PM_SLEEP /** * ahci_platform_suspend_host - Suspend an ahci-platform host * @dev: device pointer for the host * * This function does all the usual steps needed to suspend an * ahci-platform host, note any necessary resources (ie clks, phys, etc.) * must be disabled after calling this. * * RETURNS: * 0 on success otherwise a negative error code */ int ahci_platform_suspend_host(struct device *dev) { struct ata_host *host = dev_get_drvdata(dev); struct ahci_host_priv *hpriv = host->private_data; void __iomem *mmio = hpriv->mmio; u32 ctl; if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) { dev_err(dev, "firmware update required for suspend/resume\n"); return -EIO; } /* * AHCI spec rev1.1 section 8.3.3: * Software must disable interrupts prior to requesting a * transition of the HBA to D3 state. */ ctl = readl(mmio + HOST_CTL); ctl &= ~HOST_IRQ_EN; writel(ctl, mmio + HOST_CTL); readl(mmio + HOST_CTL); /* flush */ return ata_host_suspend(host, PMSG_SUSPEND); } EXPORT_SYMBOL_GPL(ahci_platform_suspend_host); /** * ahci_platform_resume_host - Resume an ahci-platform host * @dev: device pointer for the host * * This function does all the usual steps needed to resume an ahci-platform * host, note any necessary resources (ie clks, phys, etc.) must be * initialized / enabled before calling this. * * RETURNS: * 0 on success otherwise a negative error code */ int ahci_platform_resume_host(struct device *dev) { struct ata_host *host = dev_get_drvdata(dev); int rc; if (dev->power.power_state.event == PM_EVENT_SUSPEND) { rc = ahci_reset_controller(host); if (rc) return rc; ahci_init_controller(host); } ata_host_resume(host); return 0; } EXPORT_SYMBOL_GPL(ahci_platform_resume_host); /** * ahci_platform_suspend - Suspend an ahci-platform device * @dev: the platform device to suspend * * This function suspends the host associated with the device, followed by * disabling all the resources of the device. * * RETURNS: * 0 on success otherwise a negative error code */ int ahci_platform_suspend(struct device *dev) { struct ata_host *host = dev_get_drvdata(dev); struct ahci_host_priv *hpriv = host->private_data; int rc; rc = ahci_platform_suspend_host(dev); if (rc) return rc; ahci_platform_disable_resources(hpriv); return 0; } EXPORT_SYMBOL_GPL(ahci_platform_suspend); /** * ahci_platform_resume - Resume an ahci-platform device * @dev: the platform device to resume * * This function enables all the resources of the device followed by * resuming the host associated with the device. * * RETURNS: * 0 on success otherwise a negative error code */ int ahci_platform_resume(struct device *dev) { struct ata_host *host = dev_get_drvdata(dev); struct ahci_host_priv *hpriv = host->private_data; int rc; rc = ahci_platform_enable_resources(hpriv); if (rc) return rc; rc = ahci_platform_resume_host(dev); if (rc) goto disable_resources; /* We resumed so update PM runtime state */ pm_runtime_disable(dev); pm_runtime_set_active(dev); pm_runtime_enable(dev); return 0; disable_resources: ahci_platform_disable_resources(hpriv); return rc; } EXPORT_SYMBOL_GPL(ahci_platform_resume); #endif MODULE_DESCRIPTION("AHCI SATA platform library"); MODULE_AUTHOR("Anton Vorontsov "); MODULE_LICENSE("GPL");