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 int dwc3_haps_probe(struct pci_dev *pci,
  37                            const struct pci_device_id *id)
  38 {
  39         struct dwc3_haps        *dwc;
  40         struct device           *dev = &pci->dev;
  41         struct resource         res[2];
  42         int                     ret;
  43
  44         ret = pcim_enable_device(pci);
  45         if (ret) {
  46                 dev_err(dev, "failed to enable pci device\n");
  47                 return -ENODEV;
  48         }
  49
  50         pci_set_master(pci);
  51
  52         dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL);
  53         if (!dwc)
  54                 return -ENOMEM;
  55
  56         dwc->dwc3 = platform_device_alloc("dwc3", PLATFORM_DEVID_AUTO);
  57         if (!dwc->dwc3)
  58                 return -ENOMEM;
  59
  60         memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
  61
  62         res[0].start    = pci_resource_start(pci, 0);
  63         res[0].end      = pci_resource_end(pci, 0);
  64         res[0].name     = "dwc_usb3";
  65         res[0].flags    = IORESOURCE_MEM;
  66
  67         res[1].start    = pci->irq;
  68         res[1].name     = "dwc_usb3";
  69         res[1].flags    = IORESOURCE_IRQ;
  70
  71         ret = platform_device_add_resources(dwc->dwc3, res, ARRAY_SIZE(res));
  72         if (ret) {
  73                 dev_err(dev, "couldn't add resources to dwc3 device\n");
  74                 goto err;
  75         }
  76
  77         dwc->pci = pci;
  78         dwc->dwc3->dev.parent = dev;
  79
  80         ret = platform_device_add_properties(dwc->dwc3, initial_properties);
  81         if (ret)
  82                 goto err;
  83
  84         ret = platform_device_add(dwc->dwc3);
  85         if (ret) {
  86                 dev_err(dev, "failed to register dwc3 device\n");
  87                 goto err;
  88         }
  89
  90         pci_set_drvdata(pci, dwc);
  91
  92         return 0;
  93 err:
  94         platform_device_put(dwc->dwc3);
  95         return ret;
  96 }
  97
  98 static void dwc3_haps_remove(struct pci_dev *pci)
  99 {
 100         struct dwc3_haps *dwc = pci_get_drvdata(pci);
 101
 102         platform_device_unregister(dwc->dwc3);
 103 }
 104
 105 static const struct pci_device_id dwc3_haps_id_table[] = {
 106         {
 107                 PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
 108                            PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3),
 109                 /*
 110                  * i.MX6QP and i.MX7D platform use a PCIe controller with the
 111                  * same VID and PID as this USB controller. The system may
 112                  * incorrectly match this driver to that PCIe controller. To
 113                  * workaround this, specifically use class type USB to prevent
 114                  * incorrect driver matching.
 115                  */
 116                 .class = (PCI_CLASS_SERIAL_USB << 8),
 117                 .class_mask = 0xffff00,
 118         },
 119         {
 120                 PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
 121                            PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3_AXI),
 122         },
 123         {
 124                 PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
 125                            PCI_DEVICE_ID_SYNOPSYS_HAPSUSB31),
 126         },
 127         {  }    /* Terminating Entry */
 128 };
 129 MODULE_DEVICE_TABLE(pci, dwc3_haps_id_table);
 130
 131 static struct pci_driver dwc3_haps_driver = {
 132         .name           = "dwc3-haps",
 133         .id_table       = dwc3_haps_id_table,
 134         .probe          = dwc3_haps_probe,
 135         .remove         = dwc3_haps_remove,
 136 };
 137
 138 MODULE_AUTHOR("Thinh Nguyen <thinhn@synopsys.com>");
 139 MODULE_LICENSE("GPL v2");
 140 MODULE_DESCRIPTION("Synopsys HAPS PCI Glue Layer");
 141
 142 module_pci_driver(dwc3_haps_driver);