libahci: Add support to handle HOST_IRQ_STAT as edge trigger latch.
This patch adds the support to handle HOST_IRQ_STAT as edge trigger latch. Signed-off-by: Suman Tripathi <stripathi@apm.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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@ -238,6 +238,8 @@ enum {
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AHCI_HFLAG_MULTI_MSI = (1 << 16), /* multiple PCI MSIs */
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AHCI_HFLAG_NO_DEVSLP = (1 << 17), /* no device sleep */
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AHCI_HFLAG_NO_FBS = (1 << 18), /* no FBS */
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AHCI_HFLAG_EDGE_IRQ = (1 << 19), /* HOST_IRQ_STAT behaves as
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Edge Triggered */
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/* ap->flags bits */
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@ -1853,6 +1853,43 @@ static u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked)
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return handled;
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}
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static irqreturn_t ahci_single_edge_irq_intr(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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VPRINTK("ENTER\n");
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hpriv = host->private_data;
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mmio = hpriv->mmio;
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/* sigh. 0xffffffff is a valid return from h/w */
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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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irq_masked = irq_stat & hpriv->port_map;
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spin_lock(&host->lock);
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/*
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* HOST_IRQ_STAT behaves as edge triggered latch meaning that
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* it should be cleared before all the port events are cleared.
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*/
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writel(irq_stat, mmio + HOST_IRQ_STAT);
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rc = ahci_handle_port_intr(host, irq_masked);
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spin_unlock(&host->lock);
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VPRINTK("EXIT\n");
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return IRQ_RETVAL(rc);
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}
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static irqreturn_t ahci_single_level_irq_intr(int irq, void *dev_instance)
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{
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struct ata_host *host = dev_instance;
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@ -2495,6 +2532,9 @@ int ahci_host_activate(struct ata_host *host, int irq,
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if (hpriv->flags & AHCI_HFLAG_MULTI_MSI)
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rc = ahci_host_activate_multi_irqs(host, irq, sht);
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else if (hpriv->flags & AHCI_HFLAG_EDGE_IRQ)
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rc = ata_host_activate(host, irq, ahci_single_edge_irq_intr,
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IRQF_SHARED, sht);
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else
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rc = ata_host_activate(host, irq, ahci_single_level_irq_intr,
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IRQF_SHARED, sht);
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