/* * AHCI SATA platform driver * * 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 "ahci.h" enum ahci_type { AHCI, /* standard platform ahci */ IMX53_AHCI, /* ahci on i.mx53 */ STRICT_AHCI, /* delayed DMA engine start */ }; static struct platform_device_id ahci_devtype[] = { { .name = "ahci", .driver_data = AHCI, }, { .name = "imx53-ahci", .driver_data = IMX53_AHCI, }, { .name = "strict-ahci", .driver_data = STRICT_AHCI, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(platform, ahci_devtype); static const struct ata_port_info ahci_port_info[] = { /* by features */ [AHCI] = { .flags = AHCI_FLAG_COMMON, .pio_mask = ATA_PIO4, .udma_mask = ATA_UDMA6, .port_ops = &ahci_ops, }, [IMX53_AHCI] = { .flags = AHCI_FLAG_COMMON, .pio_mask = ATA_PIO4, .udma_mask = ATA_UDMA6, .port_ops = &ahci_pmp_retry_srst_ops, }, [STRICT_AHCI] = { AHCI_HFLAGS (AHCI_HFLAG_DELAY_ENGINE), .flags = AHCI_FLAG_COMMON, .pio_mask = ATA_PIO4, .udma_mask = ATA_UDMA6, .port_ops = &ahci_ops, }, }; static struct scsi_host_template ahci_platform_sht = { AHCI_SHT("ahci_platform"), }; static int __devinit ahci_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct ahci_platform_data *pdata = dev_get_platdata(dev); const struct platform_device_id *id = platform_get_device_id(pdev); struct ata_port_info pi = ahci_port_info[id ? id->driver_data : 0]; const struct ata_port_info *ppi[] = { &pi, NULL }; struct ahci_host_priv *hpriv; struct ata_host *host; struct resource *mem; int irq; int n_ports; int i; int rc; mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!mem) { dev_err(dev, "no mmio space\n"); return -EINVAL; } irq = platform_get_irq(pdev, 0); if (irq <= 0) { dev_err(dev, "no irq\n"); return -EINVAL; } if (pdata && pdata->ata_port_info) pi = *pdata->ata_port_info; hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL); if (!hpriv) { dev_err(dev, "can't alloc ahci_host_priv\n"); return -ENOMEM; } hpriv->flags |= (unsigned long)pi.private_data; hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem)); if (!hpriv->mmio) { dev_err(dev, "can't map %pR\n", mem); return -ENOMEM; } /* * Some platforms might need to prepare for mmio region access, * which could be done in the following init call. So, the mmio * region shouldn't be accessed before init (if provided) has * returned successfully. */ if (pdata && pdata->init) { rc = pdata->init(dev, hpriv->mmio); if (rc) return rc; } ahci_save_initial_config(dev, hpriv, pdata ? pdata->force_port_map : 0, pdata ? pdata->mask_port_map : 0); /* prepare host */ 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) { rc = -ENOMEM; goto err0; } host->private_data = hpriv; if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss) host->flags |= ATA_HOST_PARALLEL_SCAN; else printk(KERN_INFO "ahci: 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", mem); 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; } rc = ahci_reset_controller(host); if (rc) goto err0; ahci_init_controller(host); ahci_print_info(host, "platform"); rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED, &ahci_platform_sht); if (rc) goto err0; rc = pm_runtime_set_active(dev); if (rc) { dev_warn(dev, "Unable to set runtime pm active err=%d\n", rc); } else { pm_runtime_enable(dev); pm_runtime_forbid(dev); } return 0; err0: if (pdata && pdata->exit) pdata->exit(dev); return rc; } static int __devexit ahci_remove(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct ahci_platform_data *pdata = dev_get_platdata(dev); struct ata_host *host = dev_get_drvdata(dev); ata_host_detach(host); if (pdata && pdata->exit) pdata->exit(dev); return 0; } #ifdef CONFIG_PM static int ahci_suspend(struct device *dev) { struct ahci_platform_data *pdata = dev_get_platdata(dev); struct ata_host *host = dev_get_drvdata(dev); struct ahci_host_priv *hpriv = host->private_data; void __iomem *mmio = hpriv->mmio; u32 ctl; int rc; if (pm_runtime_suspended(dev)) return 0; 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 */ rc = ata_host_suspend(host, PMSG_SUSPEND); if (rc) return rc; if (pdata && pdata->suspend) return pdata->suspend(dev); return 0; } static int ahci_resume_common(struct device *dev) { struct ahci_platform_data *pdata = dev_get_platdata(dev); struct ata_host *host = dev_get_drvdata(dev); int rc; if (pdata && pdata->resume) { rc = pdata->resume(dev); if (rc) return 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; } static int ahci_resume(struct device *dev) { int rc; rc = ahci_resume_common(dev); if (!rc) { pm_runtime_disable(dev); pm_runtime_set_active(dev); pm_runtime_enable(dev); } return rc; } static struct dev_pm_ops ahci_pm_ops = { .suspend = &ahci_suspend, .resume = &ahci_resume, .runtime_suspend = &ahci_suspend, .runtime_resume = &ahci_resume_common, }; #endif static const struct of_device_id ahci_of_match[] = { { .compatible = "calxeda,hb-ahci", }, { .compatible = "snps,spear-ahci", }, { .compatible = "qcom,msm-ahci", }, {}, }; MODULE_DEVICE_TABLE(of, ahci_of_match); static struct platform_driver ahci_driver = { .probe = ahci_probe, .remove = __devexit_p(ahci_remove), .driver = { .name = "ahci", .owner = THIS_MODULE, .of_match_table = ahci_of_match, #ifdef CONFIG_PM .pm = &ahci_pm_ops, #endif }, .id_table = ahci_devtype, }; static int __init ahci_init(void) { return platform_driver_register(&ahci_driver); } module_init(ahci_init); static void __exit ahci_exit(void) { platform_driver_unregister(&ahci_driver); } module_exit(ahci_exit); MODULE_DESCRIPTION("AHCI SATA platform driver"); MODULE_AUTHOR("Anton Vorontsov "); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:ahci");