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 58 out: 59 return irq; 60 } 61 62 int dwc3_host_init(struct dwc3 *dwc) 63 { 64 struct property_entry props[5]; 65 struct platform_device *xhci; 66 int ret, irq; 67 int prop_idx = 0; 68 69 irq = dwc3_host_get_irq(dwc); 70 if (irq < 0) 71 return irq; 72 73 xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO); 74 if (!xhci) { 75 dev_err(dwc->dev, "couldn't allocate xHCI device\n"); 76 return -ENOMEM; 77 } 78 79 xhci->dev.parent = dwc->dev; 80 81 dwc->xhci = xhci; 82 83 ret = platform_device_add_resources(xhci, dwc->xhci_resources, 84 DWC3_XHCI_RESOURCES_NUM); 85 if (ret) { 86 dev_err(dwc->dev, "couldn't add resources to xHCI device\n"); 87 goto err; 88 } 89 90 memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props)); 91 92 props[prop_idx++] = PROPERTY_ENTRY_BOOL("xhci-sg-trb-cache-size-quirk"); 93 94 if (dwc->usb3_lpm_capable) 95 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable"); 96 97 if (dwc->usb2_lpm_disable) 98 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb2-lpm-disable"); 99 100 /** 101 * WORKAROUND: dwc3 revisions <=3.00a have a limitation 102 * where Port Disable command doesn't work. 103 * 104 * The suggested workaround is that we avoid Port Disable 105 * completely. 106 * 107 * This following flag tells XHCI to do just that. 108 */ 109 if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A)) 110 props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped"); 111 112 if (prop_idx) { 113 ret = device_create_managed_software_node(&xhci->dev, props, NULL); 114 if (ret) { 115 dev_err(dwc->dev, "failed to add properties to xHCI\n"); 116 goto err; 117 } 118 } 119 120 ret = platform_device_add(xhci); 121 if (ret) { 122 dev_err(dwc->dev, "failed to register xHCI device\n"); 123 goto err; 124 } 125 126 return 0; 127 err: 128 platform_device_put(xhci); 129 return ret; 130 } 131 132 void dwc3_host_exit(struct dwc3 *dwc) 133 { 134 platform_device_unregister(dwc->xhci); 135 dwc->xhci = NULL; 136 } 137