ahci: Workaround for ThunderX Errata#22536
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 V2: - removed newfile - code is now under CONFIG_ARM64 Changes from V1: - Rebased on top of libata/for-4.6 - Moved ThunderX intr handler to new file tj: Minor adjustments to comments. Signed-off-by: Tirumalesh Chalamarla <tchalamarla@caviumnetworks.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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@ -1331,6 +1331,44 @@ static inline void ahci_gtf_filter_workaround(struct ata_host *host)
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{}
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#endif
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#ifdef CONFIG_ARM64
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/*
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* Due to ERRATA#22536, ThunderX needs to handle HOST_IRQ_STAT differently.
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* Workaround is to make sure all pending IRQs are served before leaving
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* handler.
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*/
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static irqreturn_t ahci_thunderx_irq_handler(int irq, void *dev_instance)
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{
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struct ata_host *host = dev_instance;
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struct ahci_host_priv *hpriv;
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unsigned int rc = 0;
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void __iomem *mmio;
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u32 irq_stat, irq_masked;
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unsigned int handled = 1;
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VPRINTK("ENTER\n");
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hpriv = host->private_data;
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mmio = hpriv->mmio;
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irq_stat = readl(mmio + HOST_IRQ_STAT);
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if (!irq_stat)
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return IRQ_NONE;
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do {
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irq_masked = irq_stat & hpriv->port_map;
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spin_lock(&host->lock);
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rc = ahci_handle_port_intr(host, irq_masked);
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if (!rc)
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handled = 0;
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writel(irq_stat, mmio + HOST_IRQ_STAT);
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irq_stat = readl(mmio + HOST_IRQ_STAT);
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spin_unlock(&host->lock);
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} while (irq_stat);
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VPRINTK("EXIT\n");
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return IRQ_RETVAL(handled);
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}
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#endif
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/*
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* ahci_init_msix() - optionally enable per-port MSI-X otherwise defer
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* to single msi.
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@ -1566,6 +1604,11 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
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if (ahci_broken_devslp(pdev))
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hpriv->flags |= AHCI_HFLAG_NO_DEVSLP;
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#ifdef CONFIG_ARM64
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if (pdev->vendor == 0x177d && pdev->device == 0xa01c)
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hpriv->irq_handler = ahci_thunderx_irq_handler;
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#endif
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/* save initial config */
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ahci_pci_save_initial_config(pdev, hpriv);
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