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[v7,3/8] PCI: altera: Use size=4 IRQ domain for legacy INTx

Message ID 20170815190223.18807-4-paul.burton@imgtec.com (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Paul Burton Aug. 15, 2017, 7:02 p.m. UTC
The devicetree binding documentation for the Altera PCIe controller
shows an example which uses an interrupt-map property to map PCI INTx
interrupts to hardware IRQ numbers 1-4. The driver creates an IRQ domain
with size 5 in order to cover this range, with hwirq=0 left unused.

This patch cleans up this wasted IRQ domain entry, modifying the driver
to use an IRQ domain of size 4 which matches the actual number of PCI
INTx interrupts. Since the hwirq numbers 1-4 are part of the devicetree
binding, and this is considered ABI, we cannot simply change the
interrupt-map property to use the range 0-3. Instead we make use of the
pci_irqd_intx_xlate() helper function to translate the range 1-4 used at
the DT level into the range 0-3 which is now used within the driver, and
stop adding 1 to decoded hwirq numbers in altera_pcie_isr().

Whilst cleaning up INTx handling we make use of the new PCI_NUM_INTX
macro & drop the custom INTX_NUM definition.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Ley Foon Tan <lftan@altera.com>
Cc: linux-pci@vger.kernel.org
Cc: rfi@lists.rocketboards.org

---
I have only build tested this.

Changes in v7: None
Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None

 drivers/pci/host/pcie-altera.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)
diff mbox

Patch

diff --git a/drivers/pci/host/pcie-altera.c b/drivers/pci/host/pcie-altera.c
index 4ea4f8f5dc77..6fced590eb87 100644
--- a/drivers/pci/host/pcie-altera.c
+++ b/drivers/pci/host/pcie-altera.c
@@ -76,8 +76,6 @@ 
 #define LINK_UP_TIMEOUT			HZ
 #define LINK_RETRAIN_TIMEOUT		HZ
 
-#define INTX_NUM			4
-
 #define DWORD_MASK			3
 
 struct altera_pcie {
@@ -464,6 +462,7 @@  static int altera_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
 
 static const struct irq_domain_ops intx_domain_ops = {
 	.map = altera_pcie_intx_map,
+	.xlate = pci_irqd_intx_xlate,
 };
 
 static void altera_pcie_isr(struct irq_desc *desc)
@@ -481,11 +480,11 @@  static void altera_pcie_isr(struct irq_desc *desc)
 
 	while ((status = cra_readl(pcie, P2A_INT_STATUS)
 		& P2A_INT_STS_ALL) != 0) {
-		for_each_set_bit(bit, &status, INTX_NUM) {
+		for_each_set_bit(bit, &status, PCI_NUM_INTX) {
 			/* clear interrupts */
 			cra_writel(pcie, 1 << bit, P2A_INT_STATUS);
 
-			virq = irq_find_mapping(pcie->irq_domain, bit + 1);
+			virq = irq_find_mapping(pcie->irq_domain, bit);
 			if (virq)
 				generic_handle_irq(virq);
 			else
@@ -536,7 +535,7 @@  static int altera_pcie_init_irq_domain(struct altera_pcie *pcie)
 	struct device_node *node = dev->of_node;
 
 	/* Setup INTx */
-	pcie->irq_domain = irq_domain_add_linear(node, INTX_NUM + 1,
+	pcie->irq_domain = irq_domain_add_linear(node, PCI_NUM_INTX,
 					&intx_domain_ops, pcie);
 	if (!pcie->irq_domain) {
 		dev_err(dev, "Failed to get a INTx IRQ domain\n");