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