diff options
Diffstat (limited to 'drivers/ata/libahci_platform.c')
| -rw-r--r-- | drivers/ata/libahci_platform.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c index cd2eab6aa92e..a270a1173c8c 100644 --- a/drivers/ata/libahci_platform.c +++ b/drivers/ata/libahci_platform.c @@ -602,6 +602,40 @@ static void ahci_host_stop(struct ata_host *host) ahci_platform_disable_resources(hpriv); } +/** + * ahci_platform_shutdown - Disable interrupts and stop DMA for host ports + * @dev: 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 |