[PATCH v15 15/23] PCI: microchip: Add event irqchip field to host port and add PLDA irqchip

[Minda Chen]

As PLDA dts binding doc(Documentation/devicetree/bindings/pci/
plda,xpressrich3-axi-common.yaml) showed, PLDA PCIe contains an interrupt
controller.

Microchip PolarFire PCIE event IRQs includes PLDA interrupts and
Polarfire their own interrupts. The interrupt irqchip ops includes
ack/mask/unmask interrupt ops, which will write correct registers.
Microchip Polarfire PCIe additional interrupts require to write Polarfire
SoC self-defined registers. So Microchip PCIe event irqchip ops can not
be re-used.

To support PLDA its own event IRQ process, implements PLDA irqchip ops and
add event irqchip field to struct pcie_plda_rp.

Signed-off-by: Minda Chen <minda.chen at starfivetech.com>
Acked-by: Conor Dooley <conor.dooley at microchip.com>
---
 .../pci/controller/plda/pcie-microchip-host.c | 66 ++++++++++++++++++-
 drivers/pci/controller/plda/pcie-plda.h       |  3 +
 2 files changed, 68 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c b/drivers/pci/controller/plda/pcie-microchip-host.c
index b3df373a2141..beaf5c27da84 100644
--- a/drivers/pci/controller/plda/pcie-microchip-host.c
+++ b/drivers/pci/controller/plda/pcie-microchip-host.c
@@ -770,6 +770,64 @@ static struct irq_chip mc_event_irq_chip = {
 	.irq_unmask = mc_unmask_event_irq,
 };
 
+static u32 plda_hwirq_to_mask(int hwirq)
+{
+	u32 mask;
+
+	/* hwirq 23 - 0 are the same with register */
+	if (hwirq < EVENT_PM_MSI_INT_INTX)
+		mask = BIT(hwirq);
+	else if (hwirq == EVENT_PM_MSI_INT_INTX)
+		mask = PM_MSI_INT_INTX_MASK;
+	else
+		mask = BIT(hwirq + PCI_NUM_INTX - 1);
+
+	return mask;
+}
+
+static void plda_ack_event_irq(struct irq_data *data)
+{
+	struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
+
+	writel_relaxed(plda_hwirq_to_mask(data->hwirq),
+		       port->bridge_addr + ISTATUS_LOCAL);
+}
+
+static void plda_mask_event_irq(struct irq_data *data)
+{
+	struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
+	u32 mask, val;
+
+	mask = plda_hwirq_to_mask(data->hwirq);
+
+	raw_spin_lock(&port->lock);
+	val = readl_relaxed(port->bridge_addr + IMASK_LOCAL);
+	val &= ~mask;
+	writel_relaxed(val, port->bridge_addr + IMASK_LOCAL);
+	raw_spin_unlock(&port->lock);
+}
+
+static void plda_unmask_event_irq(struct irq_data *data)
+{
+	struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
+	u32 mask, val;
+
+	mask = plda_hwirq_to_mask(data->hwirq);
+
+	raw_spin_lock(&port->lock);
+	val = readl_relaxed(port->bridge_addr + IMASK_LOCAL);
+	val |= mask;
+	writel_relaxed(val, port->bridge_addr + IMASK_LOCAL);
+	raw_spin_unlock(&port->lock);
+}
+
+static struct irq_chip plda_event_irq_chip = {
+	.name = "PLDA PCIe EVENT",
+	.irq_ack = plda_ack_event_irq,
+	.irq_mask = plda_mask_event_irq,
+	.irq_unmask = plda_unmask_event_irq,
+};
+
 static const struct plda_event_ops plda_event_ops = {
 	.get_events = plda_get_events,
 };
@@ -777,7 +835,9 @@ static const struct plda_event_ops plda_event_ops = {
 static int plda_pcie_event_map(struct irq_domain *domain, unsigned int irq,
 			       irq_hw_number_t hwirq)
 {
-	irq_set_chip_and_handler(irq, &mc_event_irq_chip, handle_level_irq);
+	struct plda_pcie_rp *port = (void *)domain->host_data;
+
+	irq_set_chip_and_handler(irq, port->event_irq_chip, handle_level_irq);
 	irq_set_chip_data(irq, domain->host_data);
 
 	return 0;
@@ -962,6 +1022,9 @@ static int plda_init_interrupts(struct platform_device *pdev,
 	if (!port->event_ops)
 		port->event_ops = &plda_event_ops;
 
+	if (!port->event_irq_chip)
+		port->event_irq_chip = &plda_event_irq_chip;
+
 	ret = plda_pcie_init_irq_domains(port);
 	if (ret) {
 		dev_err(dev, "failed creating IRQ domains\n");
@@ -1039,6 +1102,7 @@ static int mc_platform_init(struct pci_config_window *cfg)
 		return ret;
 
 	port->plda.event_ops = &mc_event_ops;
+	port->plda.event_irq_chip = &mc_event_irq_chip;
 
 	/* Address translation is up; safe to enable interrupts */
 	ret = plda_init_interrupts(pdev, &port->plda, &mc_event);
diff --git a/drivers/pci/controller/plda/pcie-plda.h b/drivers/pci/controller/plda/pcie-plda.h
index e0e5e7cc8434..a3ce01735bea 100644
--- a/drivers/pci/controller/plda/pcie-plda.h
+++ b/drivers/pci/controller/plda/pcie-plda.h
@@ -107,6 +107,8 @@ enum plda_int_event {
 
 #define PLDA_NUM_DMA_EVENTS			16
 
+#define EVENT_PM_MSI_INT_INTX			(PLDA_NUM_DMA_EVENTS + PLDA_INTX)
+#define EVENT_PM_MSI_INT_MSI			(PLDA_NUM_DMA_EVENTS + PLDA_MSI)
 #define PLDA_MAX_EVENT_NUM			(PLDA_NUM_DMA_EVENTS + PLDA_INT_EVENT_NUM)
 
 /*
@@ -155,6 +157,7 @@ struct plda_pcie_rp {
 	raw_spinlock_t lock;
 	struct plda_msi msi;
 	const struct plda_event_ops *event_ops;
+	const struct irq_chip *event_irq_chip;
 	void __iomem *bridge_addr;
 	int num_events;
 };
-- 
2.17.1