drivers/usb/dwc3/dwc3-haps.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * dwc3-haps.c - Synopsys HAPS PCI Specific glue layer
   4  *
   5  * Copyright (C) 2018 Synopsys, Inc.
   6  *
   7  * Authors: Thinh Nguyen <thinhn@synopsys.com>,
   8  *          John Youn <johnyoun@synopsys.com>
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/pci.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/property.h>
  17
  18 /**
  19  * struct dwc3_haps - Driver private structure
  20  * @dwc3: child dwc3 platform_device
  21  * @pci: our link to PCI bus
  22  */
  23 struct dwc3_haps {
  24         struct platform_device *dwc3;
  25         struct pci_dev *pci;
  26 };
  27
  28 static const struct property_entry initial_properties[] = {
  29         PROPERTY_ENTRY_BOOL("snps,usb3_lpm_capable"),
  30         PROPERTY_ENTRY_BOOL("snps,has-lpm-erratum"),
  31         PROPERTY_ENTRY_BOOL("snps,dis_enblslpm_quirk"),
  32         PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
  33         { },
  34 };
  35
  36 static const struct software_node dwc3_haps_swnode = {
  37         .properties = initial_properties,
  38 };
  39
  40 static int dwc3_haps_probe(struct pci_dev *pci,
  41                            const struct pci_device_id *id)
  42 {
  43         struct dwc3_haps        *dwc;
  44         struct device           *dev = &pci->dev;
  45         struct resource         res[2];
  46         int                     ret;
  47
  48         ret = pcim_enable_device(pci);
  49         if (ret) {
  50                 dev_err(dev, "failed to enable pci device\n");
  51                 return -ENODEV;
  52         }
  53
  54         pci_set_master(pci);
  55
  56         dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL);
  57         if (!dwc)
  58                 return -ENOMEM;
  59
  60         dwc->dwc3 = platform_device_alloc("dwc3", PLATFORM_DEVID_AUTO);
  61         if (!dwc->dwc3)
  62                 return -ENOMEM;
  63
  64         memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
  65
  66         res[0].start    = pci_resource_start(pci, 0);
  67         res[0].end      = pci_resource_end(pci, 0);
  68         res[0].name     = "dwc_usb3";
  69         res[0].flags    = IORESOURCE_MEM;
  70
  71         res[1].start    = pci->irq;
  72         res[1].name     = "dwc_usb3";
  73         res[1].flags    = IORESOURCE_IRQ;
  74
  75         ret = platform_device_add_resources(dwc->dwc3, res, ARRAY_SIZE(res));
  76         if (ret) {
  77                 dev_err(dev, "couldn't add resources to dwc3 device\n");
  78                 goto err;
  79         }
  80
  81         dwc->pci = pci;
  82         dwc->dwc3->dev.parent = dev;
  83
  84         ret = device_add_software_node(&dwc->dwc3->dev, &dwc3_haps_swnode);
  85         if (ret)
  86                 goto err;
  87
  88         ret = platform_device_add(dwc->dwc3);
  89         if (ret) {
  90                 dev_err(dev, "failed to register dwc3 device\n");
  91                 goto err;
  92         }
  93
  94         pci_set_drvdata(pci, dwc);
  95
  96         return 0;
  97 err:
  98         device_remove_software_node(&dwc->dwc3->dev);
  99         platform_device_put(dwc->dwc3);
 100         return ret;
 101 }
 102
 103 static void dwc3_haps_remove(struct pci_dev *pci)
 104 {
 105         struct dwc3_haps *dwc = pci_get_drvdata(pci);
 106
 107         device_remove_software_node(&dwc->dwc3->dev);
 108         platform_device_unregister(dwc->dwc3);
 109 }
 110
 111 static const struct pci_device_id dwc3_haps_id_table[] = {
 112         {
 113                 PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
 114                            PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3),
 115                 /*
 116                  * i.MX6QP and i.MX7D platform use a PCIe controller with the
 117                  * same VID and PID as this USB controller. The system may
 118                  * incorrectly match this driver to that PCIe controller. To
 119                  * workaround this, specifically use class type USB to prevent
 120                  * incorrect driver matching.
 121                  */
 122                 .class = (PCI_CLASS_SERIAL_USB << 8),
 123                 .class_mask = 0xffff00,
 124         },
 125         {
 126                 PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
 127                            PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3_AXI),
 128         },
 129         {
 130                 PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
 131                            PCI_DEVICE_ID_SYNOPSYS_HAPSUSB31),
 132         },
 133         {  }    /* Terminating Entry */
 134 };
 135 MODULE_DEVICE_TABLE(pci, dwc3_haps_id_table);
 136
 137 static struct pci_driver dwc3_haps_driver = {
 138         .name           = "dwc3-haps",
 139         .id_table       = dwc3_haps_id_table,
 140         .probe          = dwc3_haps_probe,
 141         .remove         = dwc3_haps_remove,
 142 };
 143
 144 MODULE_AUTHOR("Thinh Nguyen <thinhn@synopsys.com>");
 145 MODULE_LICENSE("GPL v2");
 146 MODULE_DESCRIPTION("Synopsys HAPS PCI Glue Layer");
 147
 148 module_pci_driver(dwc3_haps_driver);