[PATCH v3 06/11] PCI: plda: Add event interrupt codes and IRQ domain ops

Minda Chen
2023-08-14T08:21:28Z

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_handle_event 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@starfivetech.com>
---
.../pci/controller/plda/pcie-microchip-host.c | 29 +++---
drivers/pci/controller/plda/pcie-plda-host.c | 99 +++++++++++++++++++
drivers/pci/controller/plda/pcie-plda.h | 19 ++++
3 files changed, 133 insertions(+), 14 deletions(-)

diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c b/drivers/pci/controller/plda/pcie-microchip-host.c
index c28840315019..b42f1aac3ec3 100644
--- a/drivers/pci/controller/plda/pcie-microchip-host.c
+++ b/drivers/pci/controller/plda/pcie-microchip-host.c
@@ -96,20 +96,21 @@
#define EVENT_LOCAL_DMA_END_ENGINE_1 12
#define EVENT_LOCAL_DMA_ERROR_ENGINE_0 13
#define EVENT_LOCAL_DMA_ERROR_ENGINE_1 14
-#define EVENT_LOCAL_A_ATR_EVT_POST_ERR 15
-#define EVENT_LOCAL_A_ATR_EVT_FETCH_ERR 16
-#define EVENT_LOCAL_A_ATR_EVT_DISCARD_ERR 17
-#define EVENT_LOCAL_A_ATR_EVT_DOORBELL 18
-#define EVENT_LOCAL_P_ATR_EVT_POST_ERR 19
-#define EVENT_LOCAL_P_ATR_EVT_FETCH_ERR 20
-#define EVENT_LOCAL_P_ATR_EVT_DISCARD_ERR 21
-#define EVENT_LOCAL_P_ATR_EVT_DOORBELL 22
-#define EVENT_LOCAL_PM_MSI_INT_INTX 23
-#define EVENT_LOCAL_PM_MSI_INT_MSI 24
-#define EVENT_LOCAL_PM_MSI_INT_AER_EVT 25
-#define EVENT_LOCAL_PM_MSI_INT_EVENTS 26
-#define EVENT_LOCAL_PM_MSI_INT_SYS_ERR 27
-#define NUM_EVENTS 28
+#define NUM_MC_EVENTS 15
+#define EVENT_LOCAL_A_ATR_EVT_POST_ERR (NUM_MC_EVENTS + EVENT_A_ATR_EVT_POST_ERR)
+#define EVENT_LOCAL_A_ATR_EVT_FETCH_ERR (NUM_MC_EVENTS + EVENT_A_ATR_EVT_FETCH_ERR)
+#define EVENT_LOCAL_A_ATR_EVT_DISCARD_ERR (NUM_MC_EVENTS + EVENT_A_ATR_EVT_DISCARD_ERR)
+#define EVENT_LOCAL_A_ATR_EVT_DOORBELL (NUM_MC_EVENTS + EVENT_A_ATR_EVT_DOORBELL)
+#define EVENT_LOCAL_P_ATR_EVT_POST_ERR (NUM_MC_EVENTS + EVENT_P_ATR_EVT_POST_ERR)
+#define EVENT_LOCAL_P_ATR_EVT_FETCH_ERR (NUM_MC_EVENTS + EVENT_P_ATR_EVT_FETCH_ERR)
+#define EVENT_LOCAL_P_ATR_EVT_DISCARD_ERR (NUM_MC_EVENTS + EVENT_P_ATR_EVT_DISCARD_ERR)
+#define EVENT_LOCAL_P_ATR_EVT_DOORBELL (NUM_MC_EVENTS + EVENT_P_ATR_EVT_DOORBELL)
+#define EVENT_LOCAL_PM_MSI_INT_INTX (NUM_MC_EVENTS + EVENT_PM_MSI_INT_INTX)
+#define EVENT_LOCAL_PM_MSI_INT_MSI (NUM_MC_EVENTS + EVENT_PM_MSI_INT_MSI)
+#define EVENT_LOCAL_PM_MSI_INT_AER_EVT (NUM_MC_EVENTS + EVENT_PM_MSI_INT_AER_EVT)
+#define EVENT_LOCAL_PM_MSI_INT_EVENTS (NUM_MC_EVENTS + EVENT_PM_MSI_INT_EVENTS)
+#define EVENT_LOCAL_PM_MSI_INT_SYS_ERR (NUM_MC_EVENTS + EVENT_PM_MSI_INT_SYS_ERR)
+#define NUM_EVENTS (NUM_MC_EVENTS + NUM_PLDA_EVENTS)

#define PCIE_EVENT_CAUSE(x, s) \
[EVENT_PCIE_ ## x] = { __stringify(x), s }
diff --git a/drivers/pci/controller/plda/pcie-plda-host.c b/drivers/pci/controller/plda/pcie-plda-host.c
index ce02cfe6b5fa..bf63f220a518 100644
--- a/drivers/pci/controller/plda/pcie-plda-host.c
+++ b/drivers/pci/controller/plda/pcie-plda-host.c
@@ -250,6 +250,105 @@ int plda_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
return 0;
}

+irqreturn_t plda_event_handler(int irq, void *dev_id)
+{
+ return IRQ_HANDLED;
+}
+
+void plda_handle_event(struct irq_desc *desc)
+{
+ struct plda_pcie_rp *port = irq_desc_get_handler_data(desc);
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ unsigned long events = 0;
+ u32 bit, val, origin;
+
+ chained_irq_enter(chip, desc);
+
+ val = readl_relaxed(port->bridge_addr + ISTATUS_LOCAL);
+ origin = val;
+ val = val >> A_ATR_EVT_POST_ERR_SHIFT;
+ events |= val & 0xff;
+ if (origin & PM_MSI_INT_INTX_MASK)
+ events |= BIT(EVENT_PM_MSI_INT_INTX);
+ val = (origin >> PM_MSI_INT_MSI_SHIFT) & 0xf;
+ events |= val << EVENT_PM_MSI_INT_MSI;
+
+ for_each_set_bit(bit, &events, port->num_events)
+ generic_handle_domain_irq(port->event_domain, bit);
+
+ chained_irq_exit(chip, desc);
+}
+
+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,
+};
+
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 b4daa74a8812..56483ebb678d 100644
--- a/drivers/pci/controller/plda/pcie-plda.h
+++ b/drivers/pci/controller/plda/pcie-plda.h
@@ -90,6 +90,23 @@
/* PCIe Config space MSI capability structure */
#define MC_MSI_CAP_CTRL_OFFSET 0xe0u

+#define EVENT_A_ATR_EVT_POST_ERR 0
+#define EVENT_A_ATR_EVT_FETCH_ERR 1
+#define EVENT_A_ATR_EVT_DISCARD_ERR 2
+#define EVENT_A_ATR_EVT_DOORBELL 3
+#define EVENT_P_ATR_EVT_POST_ERR 4
+#define EVENT_P_ATR_EVT_FETCH_ERR 5
+#define EVENT_P_ATR_EVT_DISCARD_ERR 6
+#define EVENT_P_ATR_EVT_DOORBELL 7
+#define EVENT_PM_MSI_INT_INTX 8
+#define EVENT_PM_MSI_INT_MSI 9
+#define EVENT_PM_MSI_INT_AER_EVT 10
+#define EVENT_PM_MSI_INT_EVENTS 11
+#define EVENT_PM_MSI_INT_SYS_ERR 12
+#define NUM_PLDA_EVENTS 13
+
+#define PM_MSI_TO_MASK_OFFSET 19
+
struct plda_msi {
struct mutex lock; /* Protect used bitmap */
struct irq_domain *msi_domain;
@@ -106,10 +123,12 @@ struct plda_pcie_rp {
raw_spinlock_t lock;
struct plda_msi msi;
void __iomem *bridge_addr;
+ int num_events;
};

void plda_handle_msi(struct irq_desc *desc);
int plda_allocate_msi_domains(struct plda_pcie_rp *port);
+irqreturn_t plda_event_handler(int irq, void *dev_id);
void plda_handle_intx(struct irq_desc *desc);
int plda_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
irq_hw_number_t hwirq);
--
2.17.1