drivers/usb/dwc3/host.c

   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 }