20bdc376b4
Due to hardware errata, Ampere Computing eMAG SATA can't support AHCI ALPM feature. This patch disables the AHCI ALPM feature for eMAG SATA. Signed-off-by: Suman Trpathi <stripathi@amperecomputing.com> Signed-off-by: Rameshwar Prasad Sahu <rameshwar.sahu@amperecomputing.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/*
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* AHCI SATA platform driver
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*
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* Copyright 2004-2005 Red Hat, Inc.
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* Jeff Garzik <jgarzik@pobox.com>
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* Copyright 2010 MontaVista Software, LLC.
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* Anton Vorontsov <avorontsov@ru.mvista.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pm.h>
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#include <linux/device.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/libata.h>
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#include <linux/ahci_platform.h>
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#include <linux/acpi.h>
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#include <linux/pci_ids.h>
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#include "ahci.h"
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#define DRV_NAME "ahci"
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static const struct ata_port_info ahci_port_info = {
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.flags = AHCI_FLAG_COMMON,
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.pio_mask = ATA_PIO4,
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.udma_mask = ATA_UDMA6,
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.port_ops = &ahci_platform_ops,
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};
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static const struct ata_port_info ahci_port_info_nolpm = {
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.flags = AHCI_FLAG_COMMON | ATA_FLAG_NO_LPM,
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.pio_mask = ATA_PIO4,
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.udma_mask = ATA_UDMA6,
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.port_ops = &ahci_platform_ops,
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};
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static struct scsi_host_template ahci_platform_sht = {
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AHCI_SHT(DRV_NAME),
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};
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static int ahci_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ahci_host_priv *hpriv;
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const struct ata_port_info *port;
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int rc;
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hpriv = ahci_platform_get_resources(pdev,
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AHCI_PLATFORM_GET_RESETS);
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if (IS_ERR(hpriv))
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return PTR_ERR(hpriv);
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rc = ahci_platform_enable_resources(hpriv);
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if (rc)
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return rc;
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of_property_read_u32(dev->of_node,
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"ports-implemented", &hpriv->force_port_map);
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if (of_device_is_compatible(dev->of_node, "hisilicon,hisi-ahci"))
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hpriv->flags |= AHCI_HFLAG_NO_FBS | AHCI_HFLAG_NO_NCQ;
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port = acpi_device_get_match_data(dev);
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if (!port)
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port = &ahci_port_info;
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rc = ahci_platform_init_host(pdev, hpriv, port,
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&ahci_platform_sht);
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if (rc)
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goto disable_resources;
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return 0;
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disable_resources:
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ahci_platform_disable_resources(hpriv);
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return rc;
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}
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static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_platform_suspend,
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ahci_platform_resume);
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static const struct of_device_id ahci_of_match[] = {
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{ .compatible = "generic-ahci", },
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/* Keep the following compatibles for device tree compatibility */
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{ .compatible = "snps,spear-ahci", },
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{ .compatible = "ibm,476gtr-ahci", },
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{ .compatible = "snps,dwc-ahci", },
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{ .compatible = "hisilicon,hisi-ahci", },
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{ .compatible = "cavium,octeon-7130-ahci", },
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{},
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};
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MODULE_DEVICE_TABLE(of, ahci_of_match);
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static const struct acpi_device_id ahci_acpi_match[] = {
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{ "APMC0D33", (unsigned long)&ahci_port_info_nolpm },
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{ ACPI_DEVICE_CLASS(PCI_CLASS_STORAGE_SATA_AHCI, 0xffffff) },
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{},
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};
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MODULE_DEVICE_TABLE(acpi, ahci_acpi_match);
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static struct platform_driver ahci_driver = {
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.probe = ahci_probe,
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.remove = ata_platform_remove_one,
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.shutdown = ahci_platform_shutdown,
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.driver = {
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.name = DRV_NAME,
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.of_match_table = ahci_of_match,
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.acpi_match_table = ahci_acpi_match,
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.pm = &ahci_pm_ops,
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},
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};
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module_platform_driver(ahci_driver);
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MODULE_DESCRIPTION("AHCI SATA platform driver");
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MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:ahci");
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