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
  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         if (dwc->sys_wakeup) {
 177                 /* Restore wakeup setting if switched from device */
 178                 device_wakeup_enable(dwc->sysdev);
 179
 180                 /* Pass on wakeup setting to the new xhci platform device */
 181                 device_init_wakeup(&xhci->dev, true);
 182         }
 183
 184         return 0;
 185 err:
 186         platform_device_put(xhci);
 187         return ret;
 188 }
 189
 190 void dwc3_host_exit(struct dwc3 *dwc)
 191 {
 192         if (dwc->sys_wakeup)
 193                 device_init_wakeup(&dwc->xhci->dev, false);
 194
 195         platform_device_unregister(dwc->xhci);
 196         dwc->xhci = NULL;
 197 }