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 "../host/xhci-port.h" 15 #include "../host/xhci-ext-caps.h" 16 #include "../host/xhci-caps.h" 17 #include "core.h" 18 19 #define XHCI_HCSPARAMS1 0x4 20 #define XHCI_PORTSC_BASE 0x400 21 22 /** 23 * dwc3_power_off_all_roothub_ports - Power off all Root hub ports 24 * @dwc: Pointer to our controller context structure 25 */ 26 static void dwc3_power_off_all_roothub_ports(struct dwc3 *dwc) 27 { 28 void __iomem *xhci_regs; 29 u32 op_regs_base; 30 int port_num; 31 u32 offset; 32 u32 reg; 33 int i; 34 35 /* xhci regs is not mapped yet, do it temperary here */ 36 if (dwc->xhci_resources[0].start) { 37 xhci_regs = ioremap(dwc->xhci_resources[0].start, DWC3_XHCI_REGS_END); 38 if (!xhci_regs) { 39 dev_err(dwc->dev, "Failed to ioremap xhci_regs\n"); 40 return; 41 } 42 43 op_regs_base = HC_LENGTH(readl(xhci_regs)); 44 reg = readl(xhci_regs + XHCI_HCSPARAMS1); 45 port_num = HCS_MAX_PORTS(reg); 46 47 for (i = 1; i <= port_num; i++) { 48 offset = op_regs_base + XHCI_PORTSC_BASE + 0x10 * (i - 1); 49 reg = readl(xhci_regs + offset); 50 reg &= ~PORT_POWER; 51 writel(reg, xhci_regs + offset); 52 } 53 54 iounmap(xhci_regs); 55 } else { 56 dev_err(dwc->dev, "xhci base reg invalid\n"); 57 } 58 } 59 60 static void dwc3_host_fill_xhci_irq_res(struct dwc3 *dwc, 61 int irq, char *name) 62 { 63 struct platform_device *pdev = to_platform_device(dwc->dev); 64 struct device_node *np = dev_of_node(&pdev->dev); 65 66 dwc->xhci_resources[1].start = irq; 67 dwc->xhci_resources[1].end = irq; 68 dwc->xhci_resources[1].flags = IORESOURCE_IRQ | irq_get_trigger_type(irq); 69 if (!name && np) 70 dwc->xhci_resources[1].name = of_node_full_name(pdev->dev.of_node); 71 else 72 dwc->xhci_resources[1].name = name; 73 } 74 75 static int dwc3_host_get_irq(struct dwc3 *dwc) 76 { 77 struct platform_device *dwc3_pdev = to_platform_device(dwc->dev); 78 int irq; 79 80 irq = platform_get_irq_byname_optional(dwc3_pdev, "host"); 81 if (irq > 0) { 82 dwc3_host_fill_xhci_irq_res(dwc, irq, "host"); 83 goto out; 84 } 85 86 if (irq == -EPROBE_DEFER) 87 goto out; 88 89 irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3"); 90 if (irq > 0) { 91 dwc3_host_fill_xhci_irq_res(dwc, irq, "dwc_usb3"); 92 goto out; 93 } 94 95 if (irq == -EPROBE_DEFER) 96 goto out; 97 98 irq = platform_get_irq(dwc3_pdev, 0); 99 if (irq > 0) 100 dwc3_host_fill_xhci_irq_res(dwc, irq, NULL); 101 102 out: 103 return irq; 104 } 105 106 int dwc3_host_init(struct dwc3 *dwc) 107 { 108 struct property_entry props[5]; 109 struct platform_device *xhci; 110 int ret, irq; 111 int prop_idx = 0; 112 113 /* 114 * Some platforms need to power off all Root hub ports immediately after DWC3 set to host 115 * mode to avoid VBUS glitch happen when xhci get reset later. 116 */ 117 dwc3_power_off_all_roothub_ports(dwc); 118 119 irq = dwc3_host_get_irq(dwc); 120 if (irq < 0) 121 return irq; 122 123 xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO); 124 if (!xhci) { 125 dev_err(dwc->dev, "couldn't allocate xHCI device\n"); 126 return -ENOMEM; 127 } 128 129 xhci->dev.parent = dwc->dev; 130 131 dwc->xhci = xhci; 132 133 ret = platform_device_add_resources(xhci, dwc->xhci_resources, 134 DWC3_XHCI_RESOURCES_NUM); 135 if (ret) { 136 dev_err(dwc->dev, "couldn't add resources to xHCI device\n"); 137 goto err; 138 } 139 140 memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props)); 141 142 props[prop_idx++] = PROPERTY_ENTRY_BOOL("xhci-sg-trb-cache-size-quirk"); 143 144 if (dwc->usb3_lpm_capable) 145 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable"); 146 147 if (dwc->usb2_lpm_disable) 148 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb2-lpm-disable"); 149 150 /** 151 * WORKAROUND: dwc3 revisions <=3.00a have a limitation 152 * where Port Disable command doesn't work. 153 * 154 * The suggested workaround is that we avoid Port Disable 155 * completely. 156 * 157 * This following flag tells XHCI to do just that. 158 */ 159 if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A)) 160 props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped"); 161 162 if (prop_idx) { 163 ret = device_create_managed_software_node(&xhci->dev, props, NULL); 164 if (ret) { 165 dev_err(dwc->dev, "failed to add properties to xHCI\n"); 166 goto err; 167 } 168 } 169 170 ret = platform_device_add(xhci); 171 if (ret) { 172 dev_err(dwc->dev, "failed to register xHCI device\n"); 173 goto err; 174 } 175 176 return 0; 177 err: 178 platform_device_put(xhci); 179 return ret; 180 } 181 182 void dwc3_host_exit(struct dwc3 *dwc) 183 { 184 platform_device_unregister(dwc->xhci); 185 dwc->xhci = NULL; 186 } 187