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Synopsys AHCI SATA controller can work pretty under with the generic
AHCI-platform driver control. But there are vendor-specific peculiarities
which can tune the device performance up and which may need to be fixed up
for proper device functioning. In addition some DWC AHCI-based controllers
may require small platform-specific fixups, so adding them in the generic
AHCI driver would have ruined the code simplicity. Shortly speaking in
order to keep the generic AHCI-platform code clean and have DWC AHCI
SATA-specific features supported we suggest to add a dedicated DWC AHCI
SATA device driver. Aside with the standard AHCI-platform resources
getting, enabling/disabling and the controller registration the new driver
performs the next actions.
First of all there is a way to verify whether the HBA/ports capabilities
activated in OF are correct. Almost all features availability is reflected
in the vendor-specific parameters registers. So the DWC AHCI driver does
the capabilities sanity check based on the corresponding fields state.
Secondly if either the Command Completion Coalescing or the Device Sleep
feature is enabled the DWC AHCI-specific internal 1ms timer must be fixed
in accordance with the application clock signal frequency. In particular
the timer value must be set to be Fapp * 1000. Normally the SoC designers
pre-configure the TIMER1MS register to contain a correct value by default.
But the platforms can support the application clock rate change. If that
happens the 1ms timer value must be accordingly updated otherwise the
dependent features won't work as expected. In the DWC AHCI driver we
suggest to rely on the "aclk" reference clock rate to set the timer
interval up. That clock source is supposed to be the AHCI SATA application
clock in accordance with the DT bindings.
Finally DWC AHCI SATA controller AXI/AHB bus DMA-engine can be tuned up to
transfer up to 1024 * FIFO words at a time by setting the Tx/Rx
transaction size in the DMA control register. The maximum value depends on
the DMA data bus and AXI/AHB bus maximum burst length. In most of the
cases it's better to set the maximum possible value to reach the best AHCI
SATA controller performance. But sometimes in order to improve the system
interconnect responsiveness, transferring in smaller data chunks may be
more preferable. For such cases and for the case when the default value
doesn't provide the best DMA bus performance we suggest to use the new
HBA-port specific DT-properties "snps,{tx,rx}-ts-max" to tune the DMA
transactions size up.
After all the settings denoted above are handled the DWC AHCI SATA driver
proceeds further with the standard AHCI-platform host initializations.
Note since DWC AHCI controller is now have a dedicated driver we can
discard the corresponding compatible string from the ahci-platform.c
module. The same concerns "snps,spear-ahci" compatible string, which is
also based on the DWC AHCI IP-core.
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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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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 = "ibm,476gtr-ahci", },
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{ .compatible = "hisilicon,hisi-ahci", },
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{ .compatible = "cavium,octeon-7130-ahci", },
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{ /* sentinel */ }
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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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