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PCI: plda: Add host init/deinit and map bus functions
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
Bjorn Helgaas
parent
a576fff39e
commit
76c9113968
@ -3,6 +3,7 @@
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* PLDA PCIe XpressRich host controller driver
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*
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* Copyright (C) 2023 Microchip Co. Ltd
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* StarFive Co. Ltd
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*
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* Author: Daire McNamara <daire.mcnamara@microchip.com>
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*/
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@ -15,6 +16,15 @@
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#include "pcie-plda.h"
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void __iomem *plda_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
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int where)
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{
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struct plda_pcie_rp *pcie = bus->sysdata;
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return pcie->config_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
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}
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EXPORT_SYMBOL_GPL(plda_pcie_map_bus);
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static void plda_handle_msi(struct irq_desc *desc)
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{
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struct plda_pcie_rp *port = irq_desc_get_handler_data(desc);
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@ -420,9 +430,7 @@ int plda_init_interrupts(struct platform_device *pdev,
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const struct plda_event *event)
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{
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struct device *dev = &pdev->dev;
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int irq;
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int intx_irq, msi_irq, event_irq;
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int ret;
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int event_irq, ret;
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u32 i;
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if (!port->event_ops)
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@ -437,8 +445,8 @@ int plda_init_interrupts(struct platform_device *pdev,
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return ret;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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port->irq = platform_get_irq(pdev, 0);
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if (port->irq < 0)
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return -ENODEV;
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for_each_set_bit(i, &port->events_bitmap, port->num_events) {
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@ -461,26 +469,26 @@ int plda_init_interrupts(struct platform_device *pdev,
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}
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}
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intx_irq = irq_create_mapping(port->event_domain,
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event->intx_event);
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if (!intx_irq) {
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port->intx_irq = irq_create_mapping(port->event_domain,
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event->intx_event);
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if (!port->intx_irq) {
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dev_err(dev, "failed to map INTx interrupt\n");
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return -ENXIO;
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}
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/* Plug the INTx chained handler */
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irq_set_chained_handler_and_data(intx_irq, plda_handle_intx, port);
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irq_set_chained_handler_and_data(port->intx_irq, plda_handle_intx, port);
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msi_irq = irq_create_mapping(port->event_domain,
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event->msi_event);
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if (!msi_irq)
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port->msi_irq = irq_create_mapping(port->event_domain,
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event->msi_event);
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if (!port->msi_irq)
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return -ENXIO;
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/* Plug the MSI chained handler */
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irq_set_chained_handler_and_data(msi_irq, plda_handle_msi, port);
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irq_set_chained_handler_and_data(port->msi_irq, plda_handle_msi, port);
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/* Plug the main event chained handler */
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irq_set_chained_handler_and_data(irq, plda_handle_event, port);
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irq_set_chained_handler_and_data(port->irq, plda_handle_event, port);
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return 0;
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}
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@ -547,3 +555,98 @@ int plda_pcie_setup_iomems(struct platform_device *pdev,
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return 0;
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}
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EXPORT_SYMBOL_GPL(plda_pcie_setup_iomems);
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static void plda_pcie_irq_domain_deinit(struct plda_pcie_rp *pcie)
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{
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irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
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irq_set_chained_handler_and_data(pcie->msi_irq, NULL, NULL);
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irq_set_chained_handler_and_data(pcie->intx_irq, NULL, NULL);
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irq_domain_remove(pcie->msi.msi_domain);
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irq_domain_remove(pcie->msi.dev_domain);
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irq_domain_remove(pcie->intx_domain);
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irq_domain_remove(pcie->event_domain);
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}
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int plda_pcie_host_init(struct plda_pcie_rp *port, struct pci_ops *ops,
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const struct plda_event *plda_event)
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{
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struct device *dev = port->dev;
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struct pci_host_bridge *bridge;
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struct platform_device *pdev = to_platform_device(dev);
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struct resource *cfg_res;
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int ret;
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pdev = to_platform_device(dev);
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port->bridge_addr =
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devm_platform_ioremap_resource_byname(pdev, "apb");
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if (IS_ERR(port->bridge_addr))
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return dev_err_probe(dev, PTR_ERR(port->bridge_addr),
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"failed to map reg memory\n");
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cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
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if (!cfg_res)
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return dev_err_probe(dev, -ENODEV,
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"failed to get config memory\n");
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port->config_base = devm_ioremap_resource(dev, cfg_res);
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if (IS_ERR(port->config_base))
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return dev_err_probe(dev, PTR_ERR(port->config_base),
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"failed to map config memory\n");
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bridge = devm_pci_alloc_host_bridge(dev, 0);
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if (!bridge)
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return dev_err_probe(dev, -ENOMEM,
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"failed to alloc bridge\n");
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if (port->host_ops && port->host_ops->host_init) {
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ret = port->host_ops->host_init(port);
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if (ret)
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return ret;
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}
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port->bridge = bridge;
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plda_pcie_setup_window(port->bridge_addr, 0, cfg_res->start, 0,
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resource_size(cfg_res));
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plda_pcie_setup_iomems(bridge, port);
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plda_set_default_msi(&port->msi);
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ret = plda_init_interrupts(pdev, port, plda_event);
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if (ret)
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goto err_host;
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/* Set default bus ops */
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bridge->ops = ops;
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bridge->sysdata = port;
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ret = pci_host_probe(bridge);
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if (ret < 0) {
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dev_err_probe(dev, ret, "failed to probe pci host\n");
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goto err_probe;
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}
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return ret;
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err_probe:
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plda_pcie_irq_domain_deinit(port);
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err_host:
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if (port->host_ops && port->host_ops->host_deinit)
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port->host_ops->host_deinit(port);
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return ret;
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}
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EXPORT_SYMBOL_GPL(plda_pcie_host_init);
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void plda_pcie_host_deinit(struct plda_pcie_rp *port)
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{
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pci_stop_root_bus(port->bridge->bus);
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pci_remove_root_bus(port->bridge->bus);
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plda_pcie_irq_domain_deinit(port);
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if (port->host_ops && port->host_ops->host_deinit)
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port->host_ops->host_deinit(port);
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}
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EXPORT_SYMBOL_GPL(plda_pcie_host_deinit);
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@ -142,6 +142,11 @@ struct plda_event_ops {
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u32 (*get_events)(struct plda_pcie_rp *pcie);
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};
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struct plda_pcie_host_ops {
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int (*host_init)(struct plda_pcie_rp *pcie);
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void (*host_deinit)(struct plda_pcie_rp *pcie);
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};
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struct plda_msi {
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struct mutex lock; /* Protect used bitmap */
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struct irq_domain *msi_domain;
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@ -153,14 +158,20 @@ struct plda_msi {
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struct plda_pcie_rp {
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struct device *dev;
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struct pci_host_bridge *bridge;
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struct irq_domain *intx_domain;
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struct irq_domain *event_domain;
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raw_spinlock_t lock;
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struct plda_msi msi;
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const struct plda_event_ops *event_ops;
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const struct irq_chip *event_irq_chip;
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const struct plda_pcie_host_ops *host_ops;
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void __iomem *bridge_addr;
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void __iomem *config_base;
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unsigned long events_bitmap;
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int irq;
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int msi_irq;
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int intx_irq;
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int num_events;
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};
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@ -171,6 +182,8 @@ struct plda_event {
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int msi_event;
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};
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void __iomem *plda_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
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int where);
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int plda_init_interrupts(struct platform_device *pdev,
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struct plda_pcie_rp *port,
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const struct plda_event *event);
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@ -179,4 +192,13 @@ void plda_pcie_setup_window(void __iomem *bridge_base_addr, u32 index,
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size_t size);
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int plda_pcie_setup_iomems(struct platform_device *pdev,
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struct plda_pcie_rp *port);
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int plda_pcie_host_init(struct plda_pcie_rp *port, struct pci_ops *ops,
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const struct plda_event *plda_event);
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void plda_pcie_host_deinit(struct plda_pcie_rp *pcie);
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static inline void plda_set_default_msi(struct plda_msi *msi)
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{
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msi->vector_phy = IMSI_ADDR;
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msi->num_vectors = PLDA_MAX_NUM_MSI_IRQS;
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}
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#endif
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