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PCI: plda: Add host init/deinit and map bus functions

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Add PLDA host plda_pcie_host_init()/plda_pcie_host_deinit() and map bus
function so vendors can use it to init PLDA PCIe host core.

Link: https://lore.kernel.org/linux-pci/20240328091835.14797-19-minda.chen@starfivetech.com
Signed-off-by: Minda Chen <minda.chen@starfivetech.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Mason Huo <mason.huo@starfivetech.com>
This commit is contained in:
Minda Chen 2024-03-28 17:18:31 +08:00 committed by Bjorn Helgaas
parent a576fff39e
commit 76c9113968
2 changed files with 139 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

131
drivers/pci/controller/plda/pcie-plda-host.c
View File

@ -3,6 +3,7 @@
* PLDA PCIe XpressRich host controller driver * PLDA PCIe XpressRich host controller driver
* *
* Copyright (C) 2023 Microchip Co. Ltd * Copyright (C) 2023 Microchip Co. Ltd
* StarFive Co. Ltd
* *
* Author: Daire McNamara <daire.mcnamara@microchip.com> * Author: Daire McNamara <daire.mcnamara@microchip.com>
*/ */
@ -15,6 +16,15 @@
#include "pcie-plda.h" #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) static void plda_handle_msi(struct irq_desc *desc)
{ {
struct plda_pcie_rp *port = irq_desc_get_handler_data(desc); struct plda_pcie_rp *port = irq_desc_get_handler_data(desc);
@ -420,9 +430,7 @@ int plda_init_interrupts(struct platform_device *pdev,
const struct plda_event *event) const struct plda_event *event)
{ {
struct device *dev = &pdev->dev; struct device *dev = &pdev->dev;
int irq; int event_irq, ret;
int intx_irq, msi_irq, event_irq;
int ret;
u32 i; u32 i;
if (!port->event_ops) if (!port->event_ops)
@ -437,8 +445,8 @@ int plda_init_interrupts(struct platform_device *pdev,
return ret; return ret;
} }
irq = platform_get_irq(pdev, 0); port->irq = platform_get_irq(pdev, 0);
if (irq < 0) if (port->irq < 0)
return -ENODEV; return -ENODEV;
for_each_set_bit(i, &port->events_bitmap, port->num_events) { for_each_set_bit(i, &port->events_bitmap, port->num_events) {
@ -461,26 +469,26 @@ int plda_init_interrupts(struct platform_device *pdev,
} }
} }
intx_irq = irq_create_mapping(port->event_domain, port->intx_irq = irq_create_mapping(port->event_domain,
event->intx_event); event->intx_event);
if (!intx_irq) { if (!port->intx_irq) {
dev_err(dev, "failed to map INTx interrupt\n"); dev_err(dev, "failed to map INTx interrupt\n");
return -ENXIO; return -ENXIO;
} }
/* Plug the INTx chained handler */ /* 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, port->msi_irq = irq_create_mapping(port->event_domain,
event->msi_event); event->msi_event);
if (!msi_irq) if (!port->msi_irq)
return -ENXIO; return -ENXIO;
/* Plug the MSI chained handler */ /* 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 */ /* 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; return 0;
} }
@ -547,3 +555,98 @@ int plda_pcie_setup_iomems(struct platform_device *pdev,
return 0; return 0;
} }
EXPORT_SYMBOL_GPL(plda_pcie_setup_iomems); 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,
const struct plda_event *plda_event)
{
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_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);

22
drivers/pci/controller/plda/pcie-plda.h
View File

@ -142,6 +142,11 @@ struct plda_event_ops {
u32 (*get_events)(struct plda_pcie_rp *pcie); 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 plda_msi {
struct mutex lock; /* Protect used bitmap */ struct mutex lock; /* Protect used bitmap */
struct irq_domain *msi_domain; struct irq_domain *msi_domain;
@ -153,14 +158,20 @@ struct plda_msi {
struct plda_pcie_rp { struct plda_pcie_rp {
struct device *dev; struct device *dev;
struct pci_host_bridge *bridge;
struct irq_domain *intx_domain; struct irq_domain *intx_domain;
struct irq_domain *event_domain; struct irq_domain *event_domain;
raw_spinlock_t lock; raw_spinlock_t lock;
struct plda_msi msi; struct plda_msi msi;
const struct plda_event_ops *event_ops; const struct plda_event_ops *event_ops;
const struct irq_chip *event_irq_chip; const struct irq_chip *event_irq_chip;
const struct plda_pcie_host_ops *host_ops;
void __iomem *bridge_addr; void __iomem *bridge_addr;
void __iomem *config_base;
unsigned long events_bitmap; unsigned long events_bitmap;
int irq;
int msi_irq;
int intx_irq;
int num_events; int num_events;
}; };
@ -171,6 +182,8 @@ struct plda_event {
int msi_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, int plda_init_interrupts(struct platform_device *pdev,
struct plda_pcie_rp *port, struct plda_pcie_rp *port,
const struct plda_event *event); const struct plda_event *event);
@ -179,4 +192,13 @@ void plda_pcie_setup_window(void __iomem *bridge_base_addr, u32 index,
size_t size); size_t size);
int plda_pcie_setup_iomems(struct platform_device *pdev, int plda_pcie_setup_iomems(struct platform_device *pdev,
struct plda_pcie_rp *port); struct plda_pcie_rp *port);
int plda_pcie_host_init(struct plda_pcie_rp *port, struct pci_ops *ops,
const struct plda_event *plda_event);
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 #endif