Merge branch 'for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata

Pull libata updates from Tejun Heo:
 "Except for the ahci fix that fixes a boot issue, nothing major in this
  pull request. Some new platform controller support and device specific
  changes"

* 'for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata:
  libata: zpodd: make arrays cdb static, reduces object code size
  ahci: don't use MSI for devices with the silly Intel NVMe remapping scheme
  dt-bindings: ata: add DT bindings for MediaTek SATA controller
  ata: mediatek: add support for MediaTek SATA controller
  pata_octeon_cf: use of_property_read_{bool|u32}()
  cs5536: add support for IDE controller variant
  ata: sata_gemini: Introduce explicit IDE pin control
  ata: sata_gemini: Retire custom pin control
  ata: ahci_platform: Add shutdown handler
  ata: sata_gemini: explicitly request exclusive reset control
  ata: Drop unnecessary static
  ata: Convert to using %pOF instead of full_name

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