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 #include <linux/usb.h> 14 #include <linux/usb/hcd.h> 15 16 #include "../host/xhci-port.h" 17 #include "../host/xhci-ext-caps.h" 18 #include "../host/xhci-caps.h" 19 #include "../host/xhci-plat.h" 20 #include "core.h" 21 22 #define XHCI_HCSPARAMS1 0x4 23 #define XHCI_PORTSC_BASE 0x400 24 25 /** 26 * dwc3_power_off_all_roothub_ports - Power off all Root hub ports 27 * @dwc: Pointer to our controller context structure 28 */ 29 static void dwc3_power_off_all_roothub_ports(struct dwc3 *dwc) 30 { 31 void __iomem *xhci_regs; 32 u32 op_regs_base; 33 int port_num; 34 u32 offset; 35 u32 reg; 36 int i; 37 38 /* xhci regs is not mapped yet, do it temperary here */ 39 if (dwc->xhci_resources[0].start) { 40 xhci_regs = ioremap(dwc->xhci_resources[0].start, DWC3_XHCI_REGS_END); 41 if (!xhci_regs) { 42 dev_err(dwc->dev, "Failed to ioremap xhci_regs\n"); 43 return; 44 } 45 46 op_regs_base = HC_LENGTH(readl(xhci_regs)); 47 reg = readl(xhci_regs + XHCI_HCSPARAMS1); 48 port_num = HCS_MAX_PORTS(reg); 49 50 for (i = 1; i <= port_num; i++) { 51 offset = op_regs_base + XHCI_PORTSC_BASE + 0x10 * (i - 1); 52 reg = readl(xhci_regs + offset); 53 reg &= ~PORT_POWER; 54 writel(reg, xhci_regs + offset); 55 } 56 57 iounmap(xhci_regs); 58 } else { 59 dev_err(dwc->dev, "xhci base reg invalid\n"); 60 } 61 } 62 63 static void dwc3_xhci_plat_start(struct usb_hcd *hcd) 64 { 65 struct platform_device *pdev; 66 struct dwc3 *dwc; 67 68 if (!usb_hcd_is_primary_hcd(hcd)) 69 return; 70 71 pdev = to_platform_device(hcd->self.controller); 72 dwc = dev_get_drvdata(pdev->dev.parent); 73 74 dwc3_enable_susphy(dwc, true); 75 } 76 77 static const struct xhci_plat_priv dwc3_xhci_plat_quirk = { 78 .plat_start = dwc3_xhci_plat_start, 79 }; 80 81 static void dwc3_host_fill_xhci_irq_res(struct dwc3 *dwc, 82 int irq, char *name) 83 { 84 struct platform_device *pdev = to_platform_device(dwc->dev); 85 struct device_node *np = dev_of_node(&pdev->dev); 86 87 dwc->xhci_resources[1].start = irq; 88 dwc->xhci_resources[1].end = irq; 89 dwc->xhci_resources[1].flags = IORESOURCE_IRQ | irq_get_trigger_type(irq); 90 if (!name && np) 91 dwc->xhci_resources[1].name = of_node_full_name(pdev->dev.of_node); 92 else 93 dwc->xhci_resources[1].name = name; 94 } 95 96 static int dwc3_host_get_irq(struct dwc3 *dwc) 97 { 98 struct platform_device *dwc3_pdev = to_platform_device(dwc->dev); 99 int irq; 100 101 irq = platform_get_irq_byname_optional(dwc3_pdev, "host"); 102 if (irq > 0) { 103 dwc3_host_fill_xhci_irq_res(dwc, irq, "host"); 104 goto out; 105 } 106 107 if (irq == -EPROBE_DEFER) 108 goto out; 109 110 irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3"); 111 if (irq > 0) { 112 dwc3_host_fill_xhci_irq_res(dwc, irq, "dwc_usb3"); 113 goto out; 114 } 115 116 if (irq == -EPROBE_DEFER) 117 goto out; 118 119 irq = platform_get_irq(dwc3_pdev, 0); 120 if (irq > 0) 121 dwc3_host_fill_xhci_irq_res(dwc, irq, NULL); 122 123 out: 124 return irq; 125 } 126 127 int dwc3_host_init(struct dwc3 *dwc) 128 { 129 struct property_entry props[6]; 130 struct platform_device *xhci; 131 int ret, irq; 132 int prop_idx = 0; 133 134 /* 135 * Some platforms need to power off all Root hub ports immediately after DWC3 set to host 136 * mode to avoid VBUS glitch happen when xhci get reset later. 137 */ 138 dwc3_power_off_all_roothub_ports(dwc); 139 140 irq = dwc3_host_get_irq(dwc); 141 if (irq < 0) 142 return irq; 143 144 xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO); 145 if (!xhci) { 146 dev_err(dwc->dev, "couldn't allocate xHCI device\n"); 147 return -ENOMEM; 148 } 149 150 xhci->dev.parent = dwc->dev; 151 152 dwc->xhci = xhci; 153 154 ret = platform_device_add_resources(xhci, dwc->xhci_resources, 155 DWC3_XHCI_RESOURCES_NUM); 156 if (ret) { 157 dev_err(dwc->dev, "couldn't add resources to xHCI device\n"); 158 goto err; 159 } 160 161 memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props)); 162 163 props[prop_idx++] = PROPERTY_ENTRY_BOOL("xhci-sg-trb-cache-size-quirk"); 164 165 props[prop_idx++] = PROPERTY_ENTRY_BOOL("write-64-hi-lo-quirk"); 166 167 if (dwc->usb3_lpm_capable) 168 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable"); 169 170 if (dwc->usb2_lpm_disable) 171 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb2-lpm-disable"); 172 173 /** 174 * WORKAROUND: dwc3 revisions <=3.00a have a limitation 175 * where Port Disable command doesn't work. 176 * 177 * The suggested workaround is that we avoid Port Disable 178 * completely. 179 * 180 * This following flag tells XHCI to do just that. 181 */ 182 if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A)) 183 props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped"); 184 185 if (prop_idx) { 186 ret = device_create_managed_software_node(&xhci->dev, props, NULL); 187 if (ret) { 188 dev_err(dwc->dev, "failed to add properties to xHCI\n"); 189 goto err; 190 } 191 } 192 193 ret = platform_device_add_data(xhci, &dwc3_xhci_plat_quirk, 194 sizeof(struct xhci_plat_priv)); 195 if (ret) 196 goto err; 197 198 ret = platform_device_add(xhci); 199 if (ret) { 200 dev_err(dwc->dev, "failed to register xHCI device\n"); 201 goto err; 202 } 203 204 if (dwc->sys_wakeup) { 205 /* Restore wakeup setting if switched from device */ 206 device_wakeup_enable(dwc->sysdev); 207 208 /* Pass on wakeup setting to the new xhci platform device */ 209 device_init_wakeup(&xhci->dev, true); 210 } 211 212 return 0; 213 err: 214 platform_device_put(xhci); 215 return ret; 216 } 217 218 void dwc3_host_exit(struct dwc3 *dwc) 219 { 220 if (dwc->sys_wakeup) 221 device_init_wakeup(&dwc->xhci->dev, false); 222 223 dwc3_enable_susphy(dwc, false); 224 platform_device_unregister(dwc->xhci); 225 dwc->xhci = NULL; 226 } 227