[PATCH v12 17/21] PCI: plda: Add event interrupt codes and host init/deinit functions

Minda Chen
2023-12-06T11:00:28Z

PLDA implements global IRQ domain ops like Microchip's codes. Also add a
struct plda_event instance to init PCIe interrupt.

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

Add PLDA host init/deinit functions and map bus function. So vendor can
use it to init PLDA PCIe host core.

Signed-off-by: Minda Chen <minda.chen@starfivetech.com>
Reviewed-by: Mason Huo <mason.huo@starfivetech.com>
---
drivers/pci/controller/plda/pcie-plda-host.c | 230 +++++++++++++++++--
drivers/pci/controller/plda/pcie-plda.h | 49 ++++
2 files changed, 266 insertions(+), 13 deletions(-)

diff --git a/drivers/pci/controller/plda/pcie-plda-host.c b/drivers/pci/controller/plda/pcie-plda-host.c
index e155d1d78627..10ad26216505 100644
--- a/drivers/pci/controller/plda/pcie-plda-host.c
+++ b/drivers/pci/controller/plda/pcie-plda-host.c
@@ -3,6 +3,7 @@
* PLDA PCIe XpressRich host controller driver
*
* Copyright (C) 2023 Microchip Co. Ltd
+ * StarFive Co. Ltd
*
* Author: Daire McNamara <daire.mcnamara@microchip.com>
*/
@@ -18,6 +19,15 @@

#include "pcie-plda.h"

+void __iomem *plda_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
+ int where)
+{
+ struct plda_pcie_rp *pcie = bus->sysdata;
+
+ return pcie->config_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
+}
+EXPORT_SYMBOL_GPL(plda_pcie_map_bus);
+
static void plda_handle_msi(struct irq_desc *desc)
{
struct plda_pcie_rp *port = irq_desc_get_handler_data(desc);
@@ -262,6 +272,107 @@ static 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 & ERROR_AND_DOORBELL_MASK) >> A_ATR_EVT_POST_ERR_SHIFT;
+
+ /* INTx events */
+ if (origin & PM_MSI_INT_INTX_MASK)
+ events |= BIT(EVENT_PM_MSI_INT_INTX);
+
+ /* MSI event and sys events */
+ val = (origin & SYS_AND_MSI_MASK) >> PM_MSI_INT_MSI_SHIFT;
+ 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,
+};
+
+static const struct plda_event plda_default_event = {
+ .domain_ops = &plda_evt_dom_ops,
+ .event_ops = &plda_event_ops,
+ .intx_event = EVENT_PM_MSI_INT_INTX,
+ .msi_event = EVENT_PM_MSI_INT_MSI
+};
+
static void plda_handle_event(struct irq_desc *desc)
{
struct plda_pcie_rp *port = irq_desc_get_handler_data(desc);
@@ -325,8 +436,7 @@ int plda_init_interrupts(struct platform_device *pdev,
const struct plda_event *event)
{
struct device *dev = &pdev->dev;
- int irq;
- int i, intx_irq, msi_irq, event_irq;
+ int i, event_irq;
int ret;

if (!event->event_ops || !event->event_ops->get_events) {
@@ -340,8 +450,8 @@ int plda_init_interrupts(struct platform_device *pdev,
return ret;
}

- irq = platform_get_irq(pdev, 0);
- if (irq < 0)
+ port->irq = platform_get_irq(pdev, 0);
+ if (port->irq < 0)
return -ENODEV;

port->event_ops = event->event_ops;
@@ -366,26 +476,26 @@ int plda_init_interrupts(struct platform_device *pdev,
}
}

- intx_irq = irq_create_mapping(port->event_domain,
- event->intx_event);
- if (!intx_irq) {
+ port->intx_irq = irq_create_mapping(port->event_domain,
+ event->intx_event);
+ if (!port->intx_irq) {
dev_err(dev, "failed to map INTx interrupt\n");
return -ENXIO;
}

/* Plug the INTx chained handler */
- irq_set_chained_handler_and_data(intx_irq, plda_handle_intx, port);
+ irq_set_chained_handler_and_data(port->intx_irq, plda_handle_intx, port);

- msi_irq = irq_create_mapping(port->event_domain,
- event->msi_event);
- if (!msi_irq)
+ port->msi_irq = irq_create_mapping(port->event_domain,
+ event->msi_event);
+ if (!port->msi_irq)
return -ENXIO;

/* Plug the MSI chained handler */
- irq_set_chained_handler_and_data(msi_irq, plda_handle_msi, port);
+ irq_set_chained_handler_and_data(port->msi_irq, plda_handle_msi, port);

/* Plug the main event chained handler */
- irq_set_chained_handler_and_data(irq, plda_handle_event, port);
+ irq_set_chained_handler_and_data(port->irq, plda_handle_event, port);

return 0;
}
@@ -451,3 +561,97 @@ int plda_pcie_setup_iomems(struct pci_host_bridge *bridge,
return 0;
}
EXPORT_SYMBOL_GPL(plda_pcie_setup_iomems);
+
+static void plda_pcie_irq_domain_deinit(struct plda_pcie_rp *pcie)
+{
+ irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
+ irq_set_chained_handler_and_data(pcie->msi_irq, NULL, NULL);
+ irq_set_chained_handler_and_data(pcie->intx_irq, NULL, NULL);
+
+ irq_domain_remove(pcie->msi.msi_domain);
+ irq_domain_remove(pcie->msi.dev_domain);
+
+ irq_domain_remove(pcie->intx_domain);
+ irq_domain_remove(pcie->event_domain);
+}
+
+int plda_pcie_host_init(struct plda_pcie_rp *port, struct pci_ops *ops)
+{
+ struct device *dev = port->dev;
+ struct pci_host_bridge *bridge;
+ struct platform_device *pdev = to_platform_device(dev);
+ struct resource *cfg_res;
+ int ret;
+
+ pdev = to_platform_device(dev);
+
+ port->bridge_addr =
+ devm_platform_ioremap_resource_byname(pdev, "apb");
+
+ if (IS_ERR(port->bridge_addr))
+ return dev_err_probe(dev, PTR_ERR(port->bridge_addr),
+ "failed to map reg memory\n");
+
+ cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
+ if (!cfg_res)
+ return dev_err_probe(dev, -ENODEV,
+ "failed to get config memory\n");
+
+ port->config_base = devm_ioremap_resource(dev, cfg_res);
+ if (IS_ERR(port->config_base))
+ return dev_err_probe(dev, PTR_ERR(port->config_base),
+ "failed to map config memory\n");
+
+ bridge = devm_pci_alloc_host_bridge(dev, 0);
+ if (!bridge)
+ return dev_err_probe(dev, -ENOMEM,
+ "failed to alloc bridge\n");
+
+ if (port->host_ops && port->host_ops->host_init) {
+ ret = port->host_ops->host_init(port);
+ if (ret)
+ return ret;
+ }
+
+ port->bridge = bridge;
+ plda_pcie_setup_window(port->bridge_addr, 0, cfg_res->start, 0,
+ resource_size(cfg_res));
+ plda_pcie_setup_iomems(bridge, port);
+ plda_set_default_msi(&port->msi);
+ ret = plda_init_interrupts(pdev, port, &plda_default_event);
+ if (ret)
+ goto err_host;
+
+ /* Set default bus ops */
+ bridge->ops = ops;
+ bridge->sysdata = port;
+
+ ret = pci_host_probe(bridge);
+ if (ret < 0) {
+ dev_err_probe(dev, ret, "failed to probe pci host\n");
+ goto err_probe;
+ }
+
+ return ret;
+
+err_probe:
+ plda_pcie_irq_domain_deinit(port);
+err_host:
+ if (port->host_ops && port->host_ops->host_deinit)
+ port->host_ops->host_deinit(port);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(plda_pcie_host_init);
+
+void plda_pcie_host_deinit(struct plda_pcie_rp *port)
+{
+ pci_stop_root_bus(port->bridge->bus);
+ pci_remove_root_bus(port->bridge->bus);
+
+ plda_pcie_irq_domain_deinit(port);
+
+ if (port->host_ops && port->host_ops->host_deinit)
+ port->host_ops->host_deinit(port);
+}
+EXPORT_SYMBOL_GPL(plda_pcie_host_deinit);
diff --git a/drivers/pci/controller/plda/pcie-plda.h b/drivers/pci/controller/plda/pcie-plda.h
index ce7787aef4b7..6b29bf1f5293 100644
--- a/drivers/pci/controller/plda/pcie-plda.h
+++ b/drivers/pci/controller/plda/pcie-plda.h
@@ -40,6 +40,7 @@
#define P_ATR_EVT_DISCARD_ERR_SHIFT 22
#define P_ATR_EVT_DOORBELL_MASK 0x00000000u
#define P_ATR_EVT_DOORBELL_SHIFT 23
+#define ERROR_AND_DOORBELL_MASK GENMASK(23, 16)
#define PM_MSI_INT_INTA_MASK 0x01000000u
#define PM_MSI_INT_INTA_SHIFT 24
#define PM_MSI_INT_INTB_MASK 0x02000000u
@@ -58,6 +59,7 @@
#define PM_MSI_INT_EVENTS_SHIFT 30
#define PM_MSI_INT_SYS_ERR_MASK 0x80000000u
#define PM_MSI_INT_SYS_ERR_SHIFT 31
+#define SYS_AND_MSI_MASK GENMASK(31, 28)
#define NUM_LOCAL_EVENTS 15
#define ISTATUS_LOCAL 0x184
#define IMASK_HOST 0x188
@@ -102,12 +104,43 @@
#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_pcie_host_ops {
+ int (*host_init)(struct plda_pcie_rp *pcie);
+ void (*host_deinit)(struct plda_pcie_rp *pcie);
+};
+
struct plda_msi {
struct mutex lock; /* Protect used bitmap */
struct irq_domain *msi_domain;
@@ -119,12 +152,18 @@ struct plda_msi {

struct plda_pcie_rp {
struct device *dev;
+ struct pci_host_bridge *bridge;
struct irq_domain *intx_domain;
struct irq_domain *event_domain;
raw_spinlock_t lock;
struct plda_msi msi;
const struct plda_event_ops *event_ops;
+ const struct plda_pcie_host_ops *host_ops;
void __iomem *bridge_addr;
+ void __iomem *config_base;
+ int irq;
+ int msi_irq;
+ int intx_irq;
int num_events;
};

@@ -137,6 +176,8 @@ struct plda_event {
int msi_event;
};

+void __iomem *plda_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
+ int where);
int plda_init_interrupts(struct platform_device *pdev,
struct plda_pcie_rp *port,
const struct plda_event *event);
@@ -145,4 +186,12 @@ void plda_pcie_setup_window(void __iomem *bridge_base_addr, u32 index,
size_t size);
int plda_pcie_setup_iomems(struct pci_host_bridge *bridge,
struct plda_pcie_rp *port);
+int plda_pcie_host_init(struct plda_pcie_rp *pcie, struct pci_ops *ops);
+void plda_pcie_host_deinit(struct plda_pcie_rp *pcie);
+
+static inline void plda_set_default_msi(struct plda_msi *msi)
+{
+ msi->vector_phy = IMSI_ADDR;
+ msi->num_vectors = PLDA_MAX_NUM_MSI_IRQS;
+}
#endif
--
2.17.1