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

   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 <Joao.Pinto@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/init.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         struct dw_pcie          *pci;
  29 };
  30
  31 static irqreturn_t dw_plat_pcie_msi_irq_handler(int irq, void *arg)
  32 {
  33         struct pcie_port *pp = arg;
  34
  35         return dw_handle_msi_irq(pp);
  36 }
  37
  38 static void dw_plat_pcie_host_init(struct pcie_port *pp)
  39 {
  40         struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
  41
  42         dw_pcie_setup_rc(pp);
  43         dw_pcie_wait_for_link(pci);
  44
  45         if (IS_ENABLED(CONFIG_PCI_MSI))
  46                 dw_pcie_msi_init(pp);
  47 }
  48
  49 static struct dw_pcie_host_ops dw_plat_pcie_host_ops = {
  50         .host_init = dw_plat_pcie_host_init,
  51 };
  52
  53 static int dw_plat_add_pcie_port(struct pcie_port *pp,
  54                                  struct platform_device *pdev)
  55 {
  56         struct device *dev = &pdev->dev;
  57         int ret;
  58
  59         pp->irq = platform_get_irq(pdev, 1);
  60         if (pp->irq < 0)
  61                 return pp->irq;
  62
  63         if (IS_ENABLED(CONFIG_PCI_MSI)) {
  64                 pp->msi_irq = platform_get_irq(pdev, 0);
  65                 if (pp->msi_irq < 0)
  66                         return pp->msi_irq;
  67
  68                 ret = devm_request_irq(dev, pp->msi_irq,
  69                                         dw_plat_pcie_msi_irq_handler,
  70                                         IRQF_SHARED, "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         },
 137         .probe = dw_plat_pcie_probe,
 138 };
 139 builtin_platform_driver(dw_plat_pcie_driver);