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); 149