ata: ahci_platform: Add shutdown handler (8eede5bc) · Commits · 戴 / test

drivers/ata/ahci_platform.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -93,6 +93,7 @@ MODULE_DEVICE_TABLE(acpi, ahci_acpi_match);
		static struct platform_driver ahci_driver = {
		.probe = ahci_probe,
		.remove = ata_platform_remove_one,
		.shutdown = ahci_platform_shutdown,
		.driver = {
		.name = DRV_NAME,
		.of_match_table = ahci_of_match,

+34 −0

Original line number	Diff line number	Diff line
		@@ -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

+2 −0

Original line number	Diff line number	Diff line
		@@ -36,6 +36,8 @@ int ahci_platform_init_host(struct platform_device *pdev,
		const struct ata_port_info *pi_template,
		struct scsi_host_template *sht);

		void ahci_platform_shutdown(struct platform_device *pdev);

		int ahci_platform_suspend_host(struct device *dev);
		int ahci_platform_resume_host(struct device *dev);
		int ahci_platform_suspend(struct device *dev);