Joao Pinto | 5a3aa2a | 2016-03-10 14:44:52 -0600 | [diff] [blame] | 1 | /* |
| 2 | * PCIe RC driver for Synopsys DesignWare Core |
| 3 | * |
| 4 | * Copyright (C) 2015-2016 Synopsys, Inc. (www.synopsys.com) |
| 5 | * |
| 6 | * Authors: Joao Pinto <jpinto@synopsys.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | #include <linux/clk.h> |
| 13 | #include <linux/delay.h> |
| 14 | #include <linux/gpio.h> |
| 15 | #include <linux/interrupt.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/of_gpio.h> |
| 19 | #include <linux/pci.h> |
| 20 | #include <linux/platform_device.h> |
| 21 | #include <linux/resource.h> |
| 22 | #include <linux/signal.h> |
| 23 | #include <linux/types.h> |
| 24 | |
| 25 | #include "pcie-designware.h" |
| 26 | |
| 27 | struct dw_plat_pcie { |
| 28 | void __iomem *mem_base; |
| 29 | struct pcie_port pp; |
| 30 | }; |
| 31 | |
| 32 | static irqreturn_t dw_plat_pcie_msi_irq_handler(int irq, void *arg) |
| 33 | { |
| 34 | struct pcie_port *pp = arg; |
| 35 | |
| 36 | return dw_handle_msi_irq(pp); |
| 37 | } |
| 38 | |
| 39 | static void dw_plat_pcie_host_init(struct pcie_port *pp) |
| 40 | { |
| 41 | dw_pcie_setup_rc(pp); |
| 42 | dw_pcie_wait_for_link(pp); |
| 43 | |
| 44 | if (IS_ENABLED(CONFIG_PCI_MSI)) |
| 45 | dw_pcie_msi_init(pp); |
| 46 | } |
| 47 | |
| 48 | static struct pcie_host_ops dw_plat_pcie_host_ops = { |
| 49 | .host_init = dw_plat_pcie_host_init, |
| 50 | }; |
| 51 | |
| 52 | static int dw_plat_add_pcie_port(struct pcie_port *pp, |
| 53 | struct platform_device *pdev) |
| 54 | { |
| 55 | int ret; |
| 56 | |
| 57 | pp->irq = platform_get_irq(pdev, 1); |
| 58 | if (pp->irq < 0) |
| 59 | return pp->irq; |
| 60 | |
| 61 | if (IS_ENABLED(CONFIG_PCI_MSI)) { |
| 62 | pp->msi_irq = platform_get_irq(pdev, 0); |
| 63 | if (pp->msi_irq < 0) |
| 64 | return pp->msi_irq; |
| 65 | |
| 66 | ret = devm_request_irq(&pdev->dev, pp->msi_irq, |
| 67 | dw_plat_pcie_msi_irq_handler, |
| 68 | IRQF_SHARED, "dw-plat-pcie-msi", pp); |
| 69 | if (ret) { |
| 70 | dev_err(&pdev->dev, "failed to request MSI IRQ\n"); |
| 71 | return ret; |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | pp->root_bus_nr = -1; |
| 76 | pp->ops = &dw_plat_pcie_host_ops; |
| 77 | |
| 78 | ret = dw_pcie_host_init(pp); |
| 79 | if (ret) { |
| 80 | dev_err(&pdev->dev, "failed to initialize host\n"); |
| 81 | return ret; |
| 82 | } |
| 83 | |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | static int dw_plat_pcie_probe(struct platform_device *pdev) |
| 88 | { |
| 89 | struct dw_plat_pcie *dw_plat_pcie; |
| 90 | struct pcie_port *pp; |
| 91 | struct resource *res; /* Resource from DT */ |
| 92 | int ret; |
| 93 | |
| 94 | dw_plat_pcie = devm_kzalloc(&pdev->dev, sizeof(*dw_plat_pcie), |
| 95 | GFP_KERNEL); |
| 96 | if (!dw_plat_pcie) |
| 97 | return -ENOMEM; |
| 98 | |
| 99 | pp = &dw_plat_pcie->pp; |
| 100 | pp->dev = &pdev->dev; |
| 101 | |
| 102 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 103 | if (!res) |
| 104 | return -ENODEV; |
| 105 | |
| 106 | dw_plat_pcie->mem_base = devm_ioremap_resource(&pdev->dev, res); |
| 107 | if (IS_ERR(dw_plat_pcie->mem_base)) |
| 108 | return PTR_ERR(dw_plat_pcie->mem_base); |
| 109 | |
| 110 | pp->dbi_base = dw_plat_pcie->mem_base; |
| 111 | |
| 112 | ret = dw_plat_add_pcie_port(pp, pdev); |
| 113 | if (ret < 0) |
| 114 | return ret; |
| 115 | |
| 116 | platform_set_drvdata(pdev, dw_plat_pcie); |
| 117 | return 0; |
| 118 | } |
| 119 | |
| 120 | static const struct of_device_id dw_plat_pcie_of_match[] = { |
| 121 | { .compatible = "snps,dw-pcie", }, |
| 122 | {}, |
| 123 | }; |
| 124 | MODULE_DEVICE_TABLE(of, dw_plat_pcie_of_match); |
| 125 | |
| 126 | static struct platform_driver dw_plat_pcie_driver = { |
| 127 | .driver = { |
| 128 | .name = "dw-pcie", |
| 129 | .of_match_table = dw_plat_pcie_of_match, |
| 130 | }, |
| 131 | .probe = dw_plat_pcie_probe, |
| 132 | }; |
| 133 | |
| 134 | module_platform_driver(dw_plat_pcie_driver); |
| 135 | |
| 136 | MODULE_AUTHOR("Joao Pinto <Joao.Pinto@synopsys.com>"); |
| 137 | MODULE_DESCRIPTION("Synopsys PCIe host controller glue platform driver"); |
| 138 | MODULE_LICENSE("GPL v2"); |