drivers/usb/cdns3/host.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Cadence USBSS and USBSSP DRD Driver - host side
   4  *
   5  * Copyright (C) 2018-2019 Cadence Design Systems.
   6  * Copyright (C) 2017-2018 NXP
   7  *
   8  * Authors: Peter Chen <[email protected]>
   9  *          Pawel Laszczak <[email protected]>
  10  */
  11
  12 #include <linux/platform_device.h>
  13 #include "core.h"
  14 #include "drd.h"
  15 #include "host-export.h"
  16 #include <linux/usb/hcd.h>
  17 #include "../host/xhci.h"
  18 #include "../host/xhci-plat.h"
  19
  20 #define XECP_PORT_CAP_REG       0x8000
  21 #define XECP_AUX_CTRL_REG1      0x8120
  22
  23 #define CFG_RXDET_P3_EN         BIT(15)
  24 #define LPM_2_STB_SWITCH_EN     BIT(25)
  25
  26 static int xhci_cdns3_suspend_quirk(struct usb_hcd *hcd);
  27
  28 static const struct xhci_plat_priv xhci_plat_cdns3_xhci = {
  29         .quirks = XHCI_SKIP_PHY_INIT | XHCI_AVOID_BEI,
  30         .suspend_quirk = xhci_cdns3_suspend_quirk,
  31 };
  32
  33 static int __cdns_host_init(struct cdns *cdns)
  34 {
  35         struct platform_device *xhci;
  36         int ret;
  37         struct usb_hcd *hcd;
  38
  39         cdns_drd_host_on(cdns);
  40
  41         xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
  42         if (!xhci) {
  43                 dev_err(cdns->dev, "couldn't allocate xHCI device\n");
  44                 return -ENOMEM;
  45         }
  46
  47         xhci->dev.parent = cdns->dev;
  48         cdns->host_dev = xhci;
  49
  50         ret = platform_device_add_resources(xhci, cdns->xhci_res,
  51                                             CDNS_XHCI_RESOURCES_NUM);
  52         if (ret) {
  53                 dev_err(cdns->dev, "couldn't add resources to xHCI device\n");
  54                 goto err1;
  55         }
  56
  57         cdns->xhci_plat_data = kmemdup(&xhci_plat_cdns3_xhci,
  58                         sizeof(struct xhci_plat_priv), GFP_KERNEL);
  59         if (!cdns->xhci_plat_data) {
  60                 ret = -ENOMEM;
  61                 goto err1;
  62         }
  63
  64         if (cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW))
  65                 cdns->xhci_plat_data->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
  66
  67         ret = platform_device_add_data(xhci, cdns->xhci_plat_data,
  68                         sizeof(struct xhci_plat_priv));
  69         if (ret)
  70                 goto free_memory;
  71
  72         ret = platform_device_add(xhci);
  73         if (ret) {
  74                 dev_err(cdns->dev, "failed to register xHCI device\n");
  75                 goto free_memory;
  76         }
  77
  78         /* Glue needs to access xHCI region register for Power management */
  79         hcd = platform_get_drvdata(xhci);
  80         if (hcd)
  81                 cdns->xhci_regs = hcd->regs;
  82
  83         return 0;
  84
  85 free_memory:
  86         kfree(cdns->xhci_plat_data);
  87 err1:
  88         platform_device_put(xhci);
  89         return ret;
  90 }
  91
  92 static int xhci_cdns3_suspend_quirk(struct usb_hcd *hcd)
  93 {
  94         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
  95         u32 value;
  96
  97         if (pm_runtime_status_suspended(hcd->self.controller))
  98                 return 0;
  99
 100         /* set usbcmd.EU3S */
 101         value = readl(&xhci->op_regs->command);
 102         value |= CMD_PM_INDEX;
 103         writel(value, &xhci->op_regs->command);
 104
 105         if (hcd->regs) {
 106                 value = readl(hcd->regs + XECP_AUX_CTRL_REG1);
 107                 value |= CFG_RXDET_P3_EN;
 108                 writel(value, hcd->regs + XECP_AUX_CTRL_REG1);
 109
 110                 value = readl(hcd->regs + XECP_PORT_CAP_REG);
 111                 value |= LPM_2_STB_SWITCH_EN;
 112                 writel(value, hcd->regs + XECP_PORT_CAP_REG);
 113         }
 114
 115         return 0;
 116 }
 117
 118 static void cdns_host_exit(struct cdns *cdns)
 119 {
 120         kfree(cdns->xhci_plat_data);
 121         platform_device_unregister(cdns->host_dev);
 122         cdns->host_dev = NULL;
 123         cdns_drd_host_off(cdns);
 124 }
 125
 126 int cdns_host_init(struct cdns *cdns)
 127 {
 128         struct cdns_role_driver *rdrv;
 129
 130         rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
 131         if (!rdrv)
 132                 return -ENOMEM;
 133
 134         rdrv->start     = __cdns_host_init;
 135         rdrv->stop      = cdns_host_exit;
 136         rdrv->state     = CDNS_ROLE_STATE_INACTIVE;
 137         rdrv->name      = "host";
 138
 139         cdns->roles[USB_ROLE_HOST] = rdrv;
 140
 141         return 0;
 142 }