From: Tirumalesh Chalamarla <tchalamarla@xxxxxxxxxxxxxxxxxx>
Due to Errata in ThunderX, HOST_IRQ_STAT should be
cleared before leaving the interrupt handler.
The patch attempts to satisfy the need.
Changes from V1:
- Rebased on top of libata/for-4.6
- Moved ThunderX intr handler to new file
Signed-off-by: Tirumalesh Chalamarla <tchalamarla@xxxxxxxxxxxxxxxxxx>
---
drivers/ata/Makefile | 2 +-
drivers/ata/ahci.c | 3 ++
drivers/ata/ahci.h | 1 +
drivers/ata/ahci_thunderx.c | 73 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 78 insertions(+), 1 deletion(-)
create mode 100644 drivers/ata/ahci_thunderx.c
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 1857952..a36e70d 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -2,7 +2,7 @@
obj-$(CONFIG_ATA) += libata.o
# non-SFF interface
-obj-$(CONFIG_SATA_AHCI) += ahci.o libahci.o
+obj-$(CONFIG_SATA_AHCI) += ahci.o libahci.o ahci_thunderx.o
obj-$(CONFIG_SATA_ACARD_AHCI) += acard-ahci.o libahci.o
obj-$(CONFIG_SATA_AHCI_PLATFORM) += ahci_platform.o libahci.o libahci_platform.o
obj-$(CONFIG_SATA_FSL) += sata_fsl.o
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 546a369..76e310e 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1560,6 +1560,9 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
if (ahci_broken_devslp(pdev))
hpriv->flags |= AHCI_HFLAG_NO_DEVSLP;
+ if (pdev->vendor == 0x177d && pdev->device == 0xa01c)
+ ahci_thunderx_init(&pdev->dev, hpriv);
+
/* save initial config */
ahci_pci_save_initial_config(pdev, hpriv);
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index 167ba7e..77ae20d 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -425,6 +425,7 @@ void ahci_print_info(struct ata_host *host, const char *scc_s);
int ahci_host_activate(struct ata_host *host, struct scsi_host_template *sht);
void ahci_error_handler(struct ata_port *ap);
u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked);
+void ahci_thunderx_init(struct device *dev, struct ahci_host_priv *hpriv);
static inline void __iomem *__ahci_port_base(struct ata_host *host,
unsigned int port_no)
diff --git a/drivers/ata/ahci_thunderx.c b/drivers/ata/ahci_thunderx.c
new file mode 100644
index 0000000..223e170
--- /dev/null
+++ b/drivers/ata/ahci_thunderx.c
@@ -0,0 +1,73 @@
+/*
+ * SATA glue for Cavium Thunder SOCs.
+ *
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2010-2016 Cavium Networks
+ *
+ */
+
+#include <linux/module.h>
+#include "ahci.h"
+#include "libata.h"
+
+static irqreturn_t ahci_thunderx_irq_intr(int irq, void *dev_instance)
+{
+ struct ata_host *host = dev_instance;
+ struct ahci_host_priv *hpriv;
+ unsigned int rc = 0;
+ void __iomem *mmio;
+ u32 irq_stat, irq_masked;
+ unsigned int handled = 1;
+
+ VPRINTK("ENTER\n");
+
+ hpriv = host->private_data;
+ mmio = hpriv->mmio;
+
+ /* sigh. 0xffffffff is a valid return from h/w */
+ irq_stat = readl(mmio + HOST_IRQ_STAT);
+ if (!irq_stat)
+ return IRQ_NONE;
+redo:
+
+ irq_masked = irq_stat & hpriv->port_map;
+
+ spin_lock(&host->lock);
+
+ rc = ahci_handle_port_intr(host, irq_masked);
+
+ if (!rc)
+ handled = 0;
+
+ writel(irq_stat, mmio + HOST_IRQ_STAT);
+
+ /* Due to ERRATA#22536, ThunderX need to handle
+ * HOST_IRQ_STAT differently.
+ * Work around is to make sure all pending IRQs
+ * are served before leaving handler
+ */
+ irq_stat = readl(mmio + HOST_IRQ_STAT);
+
+ spin_unlock(&host->lock);
+
+ if (irq_stat)
+ goto redo;
+
+ VPRINTK("EXIT\n");
+
+ return IRQ_RETVAL(handled);
+}
+
+void ahci_thunderx_init(struct device *dev, struct ahci_host_priv *hpriv)
+{
+ hpriv->irq_handler = ahci_thunderx_irq_intr;
+}
+EXPORT_SYMBOL_GPL(ahci_thunderx_init);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Cavium, Inc. <support@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Cavium Inc. ThunderX sata config.");
--
2.1.0
--
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