drivers/pci/dwc/pcie-designware-plat.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * PCIe RC driver for Synopsys DesignWare Core
   4  *
   5  * Copyright (C) 2015-2016 Synopsys, Inc. (www.synopsys.com)
   6  *
   7  * Authors: Joao Pinto <Joao.Pinto@synopsys.com>
   8  */
   9 #include <linux/clk.h>
  10 #include <linux/delay.h>
  11 #include <linux/gpio.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/of_gpio.h>
  16 #include <linux/pci.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/resource.h>
  19 #include <linux/signal.h>
  20 #include <linux/types.h>
  21
  22 #include "pcie-designware.h"
  23
  24 struct dw_plat_pcie {
  25         struct dw_pcie          *pci;
  26 };
  27
  28 static irqreturn_t dw_plat_pcie_msi_irq_handler(int irq, void *arg)
  29 {
  30         struct pcie_port *pp = arg;
  31
  32         return dw_handle_msi_irq(pp);
  33 }
  34
  35 static int dw_plat_pcie_host_init(struct pcie_port *pp)
  36 {
  37         struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
  38
  39         dw_pcie_setup_rc(pp);
  40         dw_pcie_wait_for_link(pci);
  41
  42         if (IS_ENABLED(CONFIG_PCI_MSI))
  43                 dw_pcie_msi_init(pp);
  44
  45         return 0;
  46 }
  47
  48 static const struct dw_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         struct device *dev = &pdev->dev;
  56         int ret;
  57
  58         pp->irq = platform_get_irq(pdev, 1);
  59         if (pp->irq < 0)
  60                 return pp->irq;
  61
  62         if (IS_ENABLED(CONFIG_PCI_MSI)) {
  63                 pp->msi_irq = platform_get_irq(pdev, 0);
  64                 if (pp->msi_irq < 0)
  65                         return pp->msi_irq;
  66
  67                 ret = devm_request_irq(dev, pp->msi_irq,
  68                                         dw_plat_pcie_msi_irq_handler,
  69                                         IRQF_SHARED | IRQF_NO_THREAD,
  70                                         "dw-plat-pcie-msi", pp);
  71                 if (ret) {
  72                         dev_err(dev, "failed to request MSI IRQ\n");
  73                         return ret;
  74                 }
  75         }
  76
  77         pp->root_bus_nr = -1;
  78         pp->ops = &dw_plat_pcie_host_ops;
  79
  80         ret = dw_pcie_host_init(pp);
  81         if (ret) {
  82                 dev_err(dev, "failed to initialize host\n");
  83                 return ret;
  84         }
  85
  86         return 0;
  87 }
  88
  89 static const struct dw_pcie_ops dw_pcie_ops = {
  90 };
  91
  92 static int dw_plat_pcie_probe(struct platform_device *pdev)
  93 {
  94         struct device *dev = &pdev->dev;
  95         struct dw_plat_pcie *dw_plat_pcie;
  96         struct dw_pcie *pci;
  97         struct resource *res;  /* Resource from DT */
  98         int ret;
  99
 100         dw_plat_pcie = devm_kzalloc(dev, sizeof(*dw_plat_pcie), GFP_KERNEL);
 101         if (!dw_plat_pcie)
 102                 return -ENOMEM;
 103
 104         pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
 105         if (!pci)
 106                 return -ENOMEM;
 107
 108         pci->dev = dev;
 109         pci->ops = &dw_pcie_ops;
 110
 111         dw_plat_pcie->pci = pci;
 112
 113         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 114         pci->dbi_base = devm_ioremap_resource(dev, res);
 115         if (IS_ERR(pci->dbi_base))
 116                 return PTR_ERR(pci->dbi_base);
 117
 118         platform_set_drvdata(pdev, dw_plat_pcie);
 119
 120         ret = dw_plat_add_pcie_port(&pci->pp, pdev);
 121         if (ret < 0)
 122                 return ret;
 123
 124         return 0;
 125 }
 126
 127 static const struct of_device_id dw_plat_pcie_of_match[] = {
 128         { .compatible = "snps,dw-pcie", },
 129         {},
 130 };
 131
 132 static struct platform_driver dw_plat_pcie_driver = {
 133         .driver = {
 134                 .name   = "dw-pcie",
 135                 .of_match_table = dw_plat_pcie_of_match,
 136                 .suppress_bind_attrs = true,
 137         },
 138         .probe = dw_plat_pcie_probe,
 139 };
 140 builtin_platform_driver(dw_plat_pcie_driver);