[PATCH v16 15/22] PCI: microchip: Add event irqchip field to host port and add PLDA irqchip

From: Minda Chen
Date: Thu Mar 28 2024 - 05:22:28 EST

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 additional 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.

Microchip Polarfire PCIe additional intrerrupts:
(defined in drivers/pci/controller/plda/pcie-microchip-host.c)
EVENT_PCIE_L2_EXIT
EVENT_PCIE_HOTRST_EXIT
EVENT_PCIE_DLUP_EXIT
EVENT_SEC_TX_RAM_SEC_ERR
EVENT_SEC_RX_RAM_SEC_ERR
...

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@xxxxxxxxxxxxxxxx>
Acked-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
---
.../pci/controller/plda/pcie-microchip-host.c | 66 ++++++++++++++++++-
drivers/pci/controller/plda/pcie-plda.h | 34 +++++-----
2 files changed, 84 insertions(+), 16 deletions(-)

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..0e5157eb3a32 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)

/*
@@ -116,21 +118,22 @@ enum plda_int_event {
* +--+--+--+-+------+-+-+-+-+-+-+-+-+-----------+-----------+
* |12|11|10|9| intx |7|6|5|4|3|2|1|0| DMA error | DMA end |
* +--+--+--+-+------+-+-+-+-+-+-+-+-+-----------+-----------+
- * bit 0-7 DMA interrupt end : reserved for vendor implement
- * bit 8-15 DMA error : reserved for vendor implement
- * 0: AXI post error (PLDA_AXI_POST_ERR)
- * 1: AXI fetch error (PLDA_AXI_FETCH_ERR)
- * 2: AXI discard error (PLDA_AXI_DISCARD_ERR)
- * 3: AXI doorbell (PLDA_PCIE_DOORBELL)
- * 4: PCIe post error (PLDA_PCIE_POST_ERR)
- * 5: PCIe fetch error (PLDA_PCIE_FETCH_ERR)
- * 6: PCIe discard error (PLDA_PCIE_DISCARD_ERR)
- * 7: PCIe doorbell (PLDA_PCIE_DOORBELL)
- * 8: 4 INTx interruts (PLDA_INTX)
- * 9: MSI interrupt (PLDA_MSI)
- * 10: AER event (PLDA_AER_EVENT)
- * 11: PM/LTR/Hotplug (PLDA_MISC_EVENTS)
- * 12: System error (PLDA_SYS_ERR)
+ * event bit
+ * 0-7 (0-7) DMA interrupt end : reserved for vendor implement
+ * 8-15 (8-15) DMA error : reserved for vendor implement
+ * 16 (16) AXI post error (PLDA_AXI_POST_ERR)
+ * 17 (17) AXI fetch error (PLDA_AXI_FETCH_ERR)
+ * 18 (18) AXI discard error (PLDA_AXI_DISCARD_ERR)
+ * 19 (19) AXI doorbell (PLDA_PCIE_DOORBELL)
+ * 20 (20) PCIe post error (PLDA_PCIE_POST_ERR)
+ * 21 (21) PCIe fetch error (PLDA_PCIE_FETCH_ERR)
+ * 22 (22) PCIe discard error (PLDA_PCIE_DISCARD_ERR)
+ * 23 (23) PCIe doorbell (PLDA_PCIE_DOORBELL)
+ * 24 (27-24) INTx interruts (PLDA_INTX)
+ * 25 (28): MSI interrupt (PLDA_MSI)
+ * 26 (29): AER event (PLDA_AER_EVENT)
+ * 27 (30): PM/LTR/Hotplug (PLDA_MISC_EVENTS)
+ * 28 (31): System error (PLDA_SYS_ERR)
*/

struct plda_pcie_rp;
@@ -155,6 +158,7 @@ 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