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); 143