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| author |   Suman Tripathi <stripathi@apm.com> | 2015-05-06 00:51:11 +0530 |
|---|---|---|
| committer |   Tejun Heo <tj@kernel.org> | 2015-05-10 11:52:44 -0400 |
| commit | 5903b1643f41ccc0cb3a0cde1d12b1c942914317 (patch) | |
| tree | 73de1cbc4f0a63194f8b9ab6d23a327c3c93cc8e /drivers/ata | |
| parent | libahci: Refactoring of ahci_single_irq_intr function. (diff) | |
| download | linux-dev-5903b1643f41ccc0cb3a0cde1d12b1c942914317.tar.xz linux-dev-5903b1643f41ccc0cb3a0cde1d12b1c942914317.zip | |
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>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/ahci.h | 2 | ||||
| -rw-r--r-- | drivers/ata/libahci.c | 40 |
2 files changed, 42 insertions, 0 deletions
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h index 71262e08648e..f4429600e2bf 100644 --- a/drivers/ata/ahci.h +++ b/drivers/ata/ahci.h @@ -238,6 +238,8 @@ enum { AHCI_HFLAG_MULTI_MSI = (1 << 16), /* multiple PCI MSIs */ AHCI_HFLAG_NO_DEVSLP = (1 << 17), /* no device sleep */ AHCI_HFLAG_NO_FBS = (1 << 18), /* no FBS */ + AHCI_HFLAG_EDGE_IRQ = (1 << 19), /* HOST_IRQ_STAT behaves as + Edge Triggered */ /* ap->flags bits */ diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index aa89c8eecd76..1add5baec584 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -1853,6 +1853,43 @@ static u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked) return handled; } +static irqreturn_t ahci_single_edge_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; + + 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; + + irq_masked = irq_stat & hpriv->port_map; + + spin_lock(&host->lock); + + /* + * HOST_IRQ_STAT behaves as edge triggered latch meaning that + * it should be cleared before all the port events are cleared. + */ + writel(irq_stat, mmio + HOST_IRQ_STAT); + + rc = ahci_handle_port_intr(host, irq_masked); + + spin_unlock(&host->lock); + + VPRINTK("EXIT\n"); + + return IRQ_RETVAL(rc); +} + static irqreturn_t ahci_single_level_irq_intr(int irq, void *dev_instance) { struct ata_host *host = dev_instance; @@ -2495,6 +2532,9 @@ int ahci_host_activate(struct ata_host *host, int irq, if (hpriv->flags & AHCI_HFLAG_MULTI_MSI) rc = ahci_host_activate_multi_irqs(host, irq, sht); + else if (hpriv->flags & AHCI_HFLAG_EDGE_IRQ) + rc = ata_host_activate(host, irq, ahci_single_edge_irq_intr, + IRQF_SHARED, sht); else rc = ata_host_activate(host, irq, ahci_single_level_irq_intr, IRQF_SHARED, sht); |