1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * host.c - DesignWare USB3 DRD Controller Host Glue 4 * 5 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com 6 * 7 * Authors: Felipe Balbi <balbi@ti.com>, 8 */ 9 10 #include <linux/acpi.h> 11 #include <linux/irq.h> 12 #include <linux/of.h> 13 #include <linux/platform_device.h> 14 15 #include "core.h" 16 17 static void dwc3_host_fill_xhci_irq_res(struct dwc3 *dwc, 18 int irq, char *name) 19 { 20 struct platform_device *pdev = to_platform_device(dwc->dev); 21 struct device_node *np = dev_of_node(&pdev->dev); 22 23 dwc->xhci_resources[1].start = irq; 24 dwc->xhci_resources[1].end = irq; 25 dwc->xhci_resources[1].flags = IORESOURCE_IRQ | irq_get_trigger_type(irq); 26 if (!name && np) 27 dwc->xhci_resources[1].name = of_node_full_name(pdev->dev.of_node); 28 else 29 dwc->xhci_resources[1].name = name; 30 } 31 32 static int dwc3_host_get_irq(struct dwc3 *dwc) 33 { 34 struct platform_device *dwc3_pdev = to_platform_device(dwc->dev); 35 int irq; 36 37 irq = platform_get_irq_byname_optional(dwc3_pdev, "host"); 38 if (irq > 0) { 39 dwc3_host_fill_xhci_irq_res(dwc, irq, "host"); 40 goto out; 41 } 42 43 if (irq == -EPROBE_DEFER) 44 goto out; 45 46 irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3"); 47 if (irq > 0) { 48 dwc3_host_fill_xhci_irq_res(dwc, irq, "dwc_usb3"); 49 goto out; 50 } 51 52 if (irq == -EPROBE_DEFER) 53 goto out; 54 55 irq = platform_get_irq(dwc3_pdev, 0); 56 if (irq > 0) { 57 dwc3_host_fill_xhci_irq_res(dwc, irq, NULL); 58 goto out; 59 } 60 61 if (!irq) 62 irq = -EINVAL; 63 64 out: 65 return irq; 66 } 67 68 int dwc3_host_init(struct dwc3 *dwc) 69 { 70 struct property_entry props[4]; 71 struct platform_device *xhci; 72 int ret, irq; 73 int prop_idx = 0; 74 75 irq = dwc3_host_get_irq(dwc); 76 if (irq < 0) 77 return irq; 78 79 xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO); 80 if (!xhci) { 81 dev_err(dwc->dev, "couldn't allocate xHCI device\n"); 82 return -ENOMEM; 83 } 84 85 xhci->dev.parent = dwc->dev; 86 ACPI_COMPANION_SET(&xhci->dev, ACPI_COMPANION(dwc->dev)); 87 88 dwc->xhci = xhci; 89 90 ret = platform_device_add_resources(xhci, dwc->xhci_resources, 91 DWC3_XHCI_RESOURCES_NUM); 92 if (ret) { 93 dev_err(dwc->dev, "couldn't add resources to xHCI device\n"); 94 goto err; 95 } 96 97 memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props)); 98 99 if (dwc->usb3_lpm_capable) 100 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable"); 101 102 if (dwc->usb2_lpm_disable) 103 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb2-lpm-disable"); 104 105 /** 106 * WORKAROUND: dwc3 revisions <=3.00a have a limitation 107 * where Port Disable command doesn't work. 108 * 109 * The suggested workaround is that we avoid Port Disable 110 * completely. 111 * 112 * This following flag tells XHCI to do just that. 113 */ 114 if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A)) 115 props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped"); 116 117 if (prop_idx) { 118 ret = device_create_managed_software_node(&xhci->dev, props, NULL); 119 if (ret) { 120 dev_err(dwc->dev, "failed to add properties to xHCI\n"); 121 goto err; 122 } 123 } 124 125 ret = platform_device_add(xhci); 126 if (ret) { 127 dev_err(dwc->dev, "failed to register xHCI device\n"); 128 goto err; 129 } 130 131 return 0; 132 err: 133 platform_device_put(xhci); 134 return ret; 135 } 136 137 void dwc3_host_exit(struct dwc3 *dwc) 138 { 139 platform_device_unregister(dwc->xhci); 140 } 141