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 #define PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3         0xabcd
  19 #define PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3_AXI     0xabce
  20 #define PCI_DEVICE_ID_SYNOPSYS_HAPSUSB31        0xabcf
  21
  22 /**
  23  * struct dwc3_haps - Driver private structure
  24  * @dwc3: child dwc3 platform_device
  25  * @pci: our link to PCI bus
  26  */
  27 struct dwc3_haps {
  28         struct platform_device *dwc3;
  29         struct pci_dev *pci;
  30 };
  31
  32 static const struct property_entry initial_properties[] = {
  33         PROPERTY_ENTRY_BOOL("snps,usb3_lpm_capable"),
  34         PROPERTY_ENTRY_BOOL("snps,has-lpm-erratum"),
  35         PROPERTY_ENTRY_BOOL("snps,dis_enblslpm_quirk"),
  36         PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
  37         { },
  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 = platform_device_add_properties(dwc->dwc3, initial_properties);
  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         platform_device_put(dwc->dwc3);
  99         return ret;
 100 }
 101
 102 static void dwc3_haps_remove(struct pci_dev *pci)
 103 {
 104         struct dwc3_haps *dwc = pci_get_drvdata(pci);
 105
 106         platform_device_unregister(dwc->dwc3);
 107 }
 108
 109 static const struct pci_device_id dwc3_haps_id_table[] = {
 110         {
 111                 PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
 112                            PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3),
 113         },
 114         {
 115                 PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
 116                            PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3_AXI),
 117         },
 118         {
 119                 PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
 120                            PCI_DEVICE_ID_SYNOPSYS_HAPSUSB31),
 121         },
 122         {  }    /* Terminating Entry */
 123 };
 124 MODULE_DEVICE_TABLE(pci, dwc3_haps_id_table);
 125
 126 static struct pci_driver dwc3_haps_driver = {
 127         .name           = "dwc3-haps",
 128         .id_table       = dwc3_haps_id_table,
 129         .probe          = dwc3_haps_probe,
 130         .remove         = dwc3_haps_remove,
 131 };
 132
 133 MODULE_AUTHOR("Thinh Nguyen <thinhn@synopsys.com>");
 134 MODULE_LICENSE("GPL v2");
 135 MODULE_DESCRIPTION("Synopsys HAPS PCI Glue Layer");
 136
 137 module_pci_driver(dwc3_haps_driver);