| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * PCIe RC driver for Synopsys DesignWare Core |
| * |
| * Copyright (C) 2015-2016 Synopsys, Inc. (www.synopsys.com) |
| * |
| * Authors: Joao Pinto <Joao.Pinto@synopsys.com> |
| */ |
| #include <linux/clk.h> |
| #include <linux/delay.h> |
| #include <linux/gpio.h> |
| #include <linux/interrupt.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/of_device.h> |
| #include <linux/pci.h> |
| #include <linux/platform_device.h> |
| #include <linux/resource.h> |
| #include <linux/types.h> |
| #include <linux/regmap.h> |
| |
| #include "pcie-designware.h" |
| |
| struct dw_plat_pcie { |
| struct dw_pcie *pci; |
| struct regmap *regmap; |
| enum dw_pcie_device_mode mode; |
| }; |
| |
| struct dw_plat_pcie_of_data { |
| enum dw_pcie_device_mode mode; |
| }; |
| |
| static const struct of_device_id dw_plat_pcie_of_match[]; |
| |
| static const struct dw_pcie_host_ops dw_plat_pcie_host_ops = { |
| }; |
| |
| static int dw_plat_pcie_establish_link(struct dw_pcie *pci) |
| { |
| return 0; |
| } |
| |
| static const struct dw_pcie_ops dw_pcie_ops = { |
| .start_link = dw_plat_pcie_establish_link, |
| }; |
| |
| static void dw_plat_pcie_ep_init(struct dw_pcie_ep *ep) |
| { |
| struct dw_pcie *pci = to_dw_pcie_from_ep(ep); |
| enum pci_barno bar; |
| |
| for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) |
| dw_pcie_ep_reset_bar(pci, bar); |
| } |
| |
| static int dw_plat_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no, |
| enum pci_epc_irq_type type, |
| u16 interrupt_num) |
| { |
| struct dw_pcie *pci = to_dw_pcie_from_ep(ep); |
| |
| switch (type) { |
| case PCI_EPC_IRQ_LEGACY: |
| return dw_pcie_ep_raise_legacy_irq(ep, func_no); |
| case PCI_EPC_IRQ_MSI: |
| return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num); |
| case PCI_EPC_IRQ_MSIX: |
| return dw_pcie_ep_raise_msix_irq(ep, func_no, interrupt_num); |
| default: |
| dev_err(pci->dev, "UNKNOWN IRQ type\n"); |
| } |
| |
| return 0; |
| } |
| |
| static const struct pci_epc_features dw_plat_pcie_epc_features = { |
| .linkup_notifier = false, |
| .msi_capable = true, |
| .msix_capable = true, |
| }; |
| |
| static const struct pci_epc_features* |
| dw_plat_pcie_get_features(struct dw_pcie_ep *ep) |
| { |
| return &dw_plat_pcie_epc_features; |
| } |
| |
| static const struct dw_pcie_ep_ops pcie_ep_ops = { |
| .ep_init = dw_plat_pcie_ep_init, |
| .raise_irq = dw_plat_pcie_ep_raise_irq, |
| .get_features = dw_plat_pcie_get_features, |
| }; |
| |
| static int dw_plat_add_pcie_port(struct dw_plat_pcie *dw_plat_pcie, |
| struct platform_device *pdev) |
| { |
| struct dw_pcie *pci = dw_plat_pcie->pci; |
| struct pcie_port *pp = &pci->pp; |
| struct device *dev = &pdev->dev; |
| int ret; |
| |
| pp->irq = platform_get_irq(pdev, 1); |
| if (pp->irq < 0) |
| return pp->irq; |
| |
| pp->num_vectors = MAX_MSI_IRQS; |
| pp->ops = &dw_plat_pcie_host_ops; |
| |
| ret = dw_pcie_host_init(pp); |
| if (ret) { |
| dev_err(dev, "Failed to initialize host\n"); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int dw_plat_pcie_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct dw_plat_pcie *dw_plat_pcie; |
| struct dw_pcie *pci; |
| int ret; |
| const struct dw_plat_pcie_of_data *data; |
| enum dw_pcie_device_mode mode; |
| |
| data = of_device_get_match_data(dev); |
| if (!data) |
| return -EINVAL; |
| |
| mode = (enum dw_pcie_device_mode)data->mode; |
| |
| dw_plat_pcie = devm_kzalloc(dev, sizeof(*dw_plat_pcie), GFP_KERNEL); |
| if (!dw_plat_pcie) |
| return -ENOMEM; |
| |
| pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL); |
| if (!pci) |
| return -ENOMEM; |
| |
| pci->dev = dev; |
| pci->ops = &dw_pcie_ops; |
| |
| dw_plat_pcie->pci = pci; |
| dw_plat_pcie->mode = mode; |
| |
| platform_set_drvdata(pdev, dw_plat_pcie); |
| |
| switch (dw_plat_pcie->mode) { |
| case DW_PCIE_RC_TYPE: |
| if (!IS_ENABLED(CONFIG_PCIE_DW_PLAT_HOST)) |
| return -ENODEV; |
| |
| ret = dw_plat_add_pcie_port(dw_plat_pcie, pdev); |
| if (ret < 0) |
| return ret; |
| break; |
| case DW_PCIE_EP_TYPE: |
| if (!IS_ENABLED(CONFIG_PCIE_DW_PLAT_EP)) |
| return -ENODEV; |
| |
| pci->ep.ops = &pcie_ep_ops; |
| return dw_pcie_ep_init(&pci->ep); |
| default: |
| dev_err(dev, "INVALID device type %d\n", dw_plat_pcie->mode); |
| } |
| |
| return 0; |
| } |
| |
| static const struct dw_plat_pcie_of_data dw_plat_pcie_rc_of_data = { |
| .mode = DW_PCIE_RC_TYPE, |
| }; |
| |
| static const struct dw_plat_pcie_of_data dw_plat_pcie_ep_of_data = { |
| .mode = DW_PCIE_EP_TYPE, |
| }; |
| |
| static const struct of_device_id dw_plat_pcie_of_match[] = { |
| { |
| .compatible = "snps,dw-pcie", |
| .data = &dw_plat_pcie_rc_of_data, |
| }, |
| { |
| .compatible = "snps,dw-pcie-ep", |
| .data = &dw_plat_pcie_ep_of_data, |
| }, |
| {}, |
| }; |
| |
| static struct platform_driver dw_plat_pcie_driver = { |
| .driver = { |
| .name = "dw-pcie", |
| .of_match_table = dw_plat_pcie_of_match, |
| .suppress_bind_attrs = true, |
| }, |
| .probe = dw_plat_pcie_probe, |
| }; |
| builtin_platform_driver(dw_plat_pcie_driver); |