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Subject[PATCH 06/10] PCI: keystone: Cleanup ks_pcie_msi_irq_handler and ks_pcie_legacy_irq_handler
Date
Both ks_pcie_msi_irq_handler() and ks_pcie_legacy_irq_handler() invokes
ks_pcie_handle_msi_irq() and ks_pcie_handle_legacy_irq() respectively
for handling the interrupts.

Having two functions for handling the interrupt was used when keystone
PCIe driver was implemented using two files. But with
commit b492aca35c982011500377797d2 ("PCI: keystone: Merge
pci-keystone-dw.c and pci-keystone.c"), which merged the keystone PCIe
driver to use a single file, two functions for handling the
interrupt handler is not required.

Handle both MSI interrupt and legacy interrupt in a single interrupt
handler here.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
drivers/pci/controller/dwc/pci-keystone.c | 92 ++++++++++-------------
1 file changed, 39 insertions(+), 53 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index 8a78307dac99..05b2bd613c68 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -104,13 +104,6 @@ struct keystone_pcie {
struct resource app;
};

-static inline void update_reg_offset_bit_pos(u32 offset, u32 *reg_offset,
- u32 *bit_pos)
-{
- *reg_offset = offset % 8;
- *bit_pos = offset >> 3;
-}
-
static phys_addr_t ks_pcie_get_msi_addr(struct pcie_port *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
@@ -130,31 +123,6 @@ static void ks_pcie_app_writel(struct keystone_pcie *ks_pcie, u32 offset,
writel(val, ks_pcie->va_app_base + offset);
}

-static void ks_pcie_handle_msi_irq(struct keystone_pcie *ks_pcie, int offset)
-{
- struct dw_pcie *pci = ks_pcie->pci;
- struct pcie_port *pp = &pci->pp;
- struct device *dev = pci->dev;
- u32 pending, vector;
- int src, virq;
-
- pending = ks_pcie_app_readl(ks_pcie, MSI_IRQ_STATUS(offset));
-
- /*
- * MSI0 status bit 0-3 shows vectors 0, 8, 16, 24, MSI1 status bit
- * shows 1, 9, 17, 25 and so forth
- */
- for (src = 0; src < 4; src++) {
- if (BIT(src) & pending) {
- vector = offset + (src << 3);
- virq = irq_linear_revmap(pp->irq_domain, vector);
- dev_dbg(dev, "irq: bit %d, vector %d, virq %d\n",
- src, vector, virq);
- generic_handle_irq(virq);
- }
- }
-}
-
static void ks_pcie_msi_irq_ack(int irq, struct pcie_port *pp)
{
u32 reg_offset, bit_pos;
@@ -163,7 +131,9 @@ static void ks_pcie_msi_irq_ack(int irq, struct pcie_port *pp)

pci = to_dw_pcie_from_pp(pp);
ks_pcie = to_keystone_pcie(pci);
- update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
+
+ reg_offset = irq % 8;
+ bit_pos = irq >> 3;

ks_pcie_app_writel(ks_pcie, MSI_IRQ_STATUS(reg_offset),
BIT(bit_pos));
@@ -176,7 +146,9 @@ static void ks_pcie_msi_set_irq(struct pcie_port *pp, int irq)
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);

- update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
+ reg_offset = irq % 8;
+ bit_pos = irq >> 3;
+
ks_pcie_app_writel(ks_pcie, MSI_IRQ_ENABLE_SET(reg_offset),
BIT(bit_pos));
}
@@ -187,7 +159,9 @@ static void ks_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);

- update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
+ reg_offset = irq % 8;
+ bit_pos = irq >> 3;
+
ks_pcie_app_writel(ks_pcie, MSI_IRQ_ENABLE_CLR(reg_offset),
BIT(bit_pos));
}
@@ -197,21 +171,6 @@ static int ks_pcie_msi_host_init(struct pcie_port *pp)
return dw_pcie_allocate_domains(pp);
}

-static void ks_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie,
- int offset)
-{
- struct dw_pcie *pci = ks_pcie->pci;
- struct device *dev = pci->dev;
- int virq;
-
- virq = irq_linear_revmap(ks_pcie->legacy_irq_domain, offset);
- dev_dbg(dev, ": irq: irq_offset %d, virq %d\n", offset, virq);
- generic_handle_irq(virq);
-
- /* EOI the INTx interrupt */
- ks_pcie_app_writel(ks_pcie, IRQ_EOI, offset);
-}
-
static void ks_pcie_enable_error_irq(struct keystone_pcie *ks_pcie)
{
ks_pcie_app_writel(ks_pcie, ERR_IRQ_ENABLE_SET, ERR_IRQ_ALL);
@@ -530,8 +489,13 @@ static void ks_pcie_msi_irq_handler(struct irq_desc *desc)
struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
u32 offset = irq - ks_pcie->msi_host_irq;
struct dw_pcie *pci = ks_pcie->pci;
+ struct pcie_port *pp = &pci->pp;
struct device *dev = pci->dev;
struct irq_chip *chip = irq_desc_get_chip(desc);
+ u32 vector;
+ u32 virq;
+ u32 reg;
+ u32 pos;

dev_dbg(dev, "%s, irq %d\n", __func__, irq);

@@ -541,7 +505,23 @@ static void ks_pcie_msi_irq_handler(struct irq_desc *desc)
* ack operation.
*/
chained_irq_enter(chip, desc);
- ks_pcie_handle_msi_irq(ks_pcie, offset);
+
+ reg = ks_pcie_app_readl(ks_pcie, MSI_IRQ_STATUS(offset));
+ /*
+ * MSI0 status bit 0-3 shows vectors 0, 8, 16, 24, MSI1 status bit
+ * shows 1, 9, 17, 25 and so forth
+ */
+ for (pos = 0; pos < 4; pos++) {
+ if (!(reg & BIT(pos)))
+ continue;
+
+ vector = offset + (pos << 3);
+ virq = irq_linear_revmap(pp->irq_domain, vector);
+ dev_dbg(dev, "irq: bit %d, vector %d, virq %d\n", pos, vector,
+ virq);
+ generic_handle_irq(virq);
+ }
+
chained_irq_exit(chip, desc);
}

@@ -561,6 +541,7 @@ static void ks_pcie_legacy_irq_handler(struct irq_desc *desc)
struct device *dev = pci->dev;
struct irq_chip *chip = irq_desc_get_chip(desc);
unsigned int irq_no;
+ u32 virq;
u32 reg;

dev_dbg(dev, ": Handling legacy irq %d\n", irq);
@@ -575,9 +556,14 @@ static void ks_pcie_legacy_irq_handler(struct irq_desc *desc)
reg = ks_pcie_app_readl(ks_pcie, IRQ_STATUS(irq_no));
if (!(reg & INTx_EN))
continue;
- ks_pcie_handle_legacy_irq(ks_pcie, irq_no);
- }

+ virq = irq_linear_revmap(ks_pcie->legacy_irq_domain, irq_no);
+ dev_dbg(dev, ": irq: irq_offset %d, virq %d\n", irq_no, virq);
+ generic_handle_irq(virq);
+
+ /* EOI the INTx interrupt */
+ ks_pcie_app_writel(ks_pcie, IRQ_EOI, irq_no);
+ }
chained_irq_exit(chip, desc);
}

--
2.17.1
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