[PATCH v6 08/19] PCI: plda: Add event interrupt codes and IRQ domain ops

[Minda Chen]

For PolarFire implements non-PLDA local interrupt events, most of
event interrupt process codes can not be re-used. PLDA implements
new codes and IRQ domain ops like PolarFire.

plda_get_events() adds a new IRQ num to event num mapping codes for
PLDA local event except DMA engine interrupt events. The DMA engine
interrupt events are implemented by vendors.

Signed-off-by: Minda Chen <minda.chen at starfivetech.com>
---
 drivers/pci/controller/plda/pcie-plda-host.c | 99 ++++++++++++++++++++
 drivers/pci/controller/plda/pcie-plda.h      | 33 +++++++
 2 files changed, 132 insertions(+)

diff --git a/drivers/pci/controller/plda/pcie-plda-host.c b/drivers/pci/controller/plda/pcie-plda-host.c
index f0c7636f1f64..f29ff0f00dda 100644
--- a/drivers/pci/controller/plda/pcie-plda-host.c
+++ b/drivers/pci/controller/plda/pcie-plda-host.c
@@ -20,6 +20,105 @@
 
 #include "pcie-plda.h"
 
+irqreturn_t plda_event_handler(int irq, void *dev_id)
+{
+	return IRQ_HANDLED;
+}
+
+static u32 plda_get_events(struct plda_pcie_rp *port)
+{
+	u32 events, val, origin;
+
+	origin = readl_relaxed(port->bridge_addr + ISTATUS_LOCAL);
+
+	/* Error events and doorbell events */
+	events = (origin >> A_ATR_EVT_POST_ERR_SHIFT) & 0xff;
+
+	/* INTx events */
+	if (origin & PM_MSI_INT_INTX_MASK)
+		events |= BIT(EVENT_PM_MSI_INT_INTX);
+
+	/* MSI event and sys events */
+	val = (origin >> PM_MSI_INT_MSI_SHIFT) & 0xf;
+	events |= val << EVENT_PM_MSI_INT_MSI;
+
+	return events;
+}
+
+static u32 plda_hwirq_to_mask(int hwirq)
+{
+	u32 mask;
+
+	if (hwirq < EVENT_PM_MSI_INT_INTX)
+		mask = BIT(hwirq + A_ATR_EVT_POST_ERR_SHIFT);
+	else if (hwirq == EVENT_PM_MSI_INT_INTX)
+		mask = PM_MSI_INT_INTX_MASK;
+	else
+		mask = BIT(hwirq + PM_MSI_TO_MASK_OFFSET);
+
+	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 int plda_pcie_event_map(struct irq_domain *domain, unsigned int irq,
+			       irq_hw_number_t hwirq)
+{
+	irq_set_chip_and_handler(irq, &plda_event_irq_chip, handle_level_irq);
+	irq_set_chip_data(irq, domain->host_data);
+
+	return 0;
+}
+
+static const struct irq_domain_ops plda_evt_dom_ops = {
+	.map = plda_pcie_event_map,
+};
+
+static const struct plda_event_ops plda_event_ops = {
+	.get_events = plda_get_events,
+};
+
 void plda_pcie_setup_window(void __iomem *bridge_base_addr, u32 index,
 			    phys_addr_t axi_addr, phys_addr_t pci_addr,
 			    size_t size)
diff --git a/drivers/pci/controller/plda/pcie-plda.h b/drivers/pci/controller/plda/pcie-plda.h
index 3deefd35fa5a..32a913d4101f 100644
--- a/drivers/pci/controller/plda/pcie-plda.h
+++ b/drivers/pci/controller/plda/pcie-plda.h
@@ -102,6 +102,38 @@
 #define EVENT_PM_MSI_INT_SYS_ERR		12
 #define NUM_PLDA_EVENTS				13
 
+/*
+ * PLDA local interrupt register
+ *
+ * 31         27     23              15           7          0
+ * +--+--+--+-+------+-+-+-+-+-+-+-+-+-----------+-----------+
+ * |12|11|10|9| intx |7|6|5|4|3|2|1|0| DMA error | DMA end   |
+ * +--+--+--+-+------+-+-+-+-+-+-+-+-+-----------+-----------+
+ * 0:  AXI post error
+ * 1:  AXI fetch error
+ * 2:  AXI discard error
+ * 3:  AXI doorbell
+ * 4:  PCIe post error
+ * 5:  PCIe fetch error
+ * 6:  PCIe discard error
+ * 7:  PCIe doorbell
+ * 8:  4 INTx interruts
+ * 9:  MSI interrupt
+ * 10: AER event
+ * 11: PM/LTR/Hotplug
+ * 12: System error
+ * DMA error : reserved for vendor implement
+ * DMA end : reserved for vendor implement
+ */
+
+#define PM_MSI_TO_MASK_OFFSET			19
+
+struct plda_pcie_rp;
+
+struct plda_event_ops {
+	u32 (*get_events)(struct plda_pcie_rp *pcie);
+};
+
 struct plda_msi {
 	struct mutex lock;		/* Protect used bitmap */
 	struct irq_domain *msi_domain;
@@ -120,6 +152,7 @@ struct plda_pcie_rp {
 	void __iomem *bridge_addr;
 };
 
+irqreturn_t plda_event_handler(int irq, void *dev_id);
 void plda_pcie_setup_window(void __iomem *bridge_base_addr, u32 index,
 			    phys_addr_t axi_addr, phys_addr_t pci_addr,
 			    size_t size);
-- 
2.17.1