drivers/usb/cdns3/host.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Cadence USBSS DRD Driver - host side
   4  *
   5  * Copyright (C) 2018-2019 Cadence Design Systems.
   6  * Copyright (C) 2017-2018 NXP
   7  *
   8  * Authors: Peter Chen <peter.chen@nxp.com>
   9  *          Pawel Laszczak <pawell@cadence.com>
  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 const struct xhci_plat_priv xhci_plat_cdns3_xhci = {
  27         .quirks = XHCI_SKIP_PHY_INIT | XHCI_AVOID_BEI,
  28         .suspend_quirk = xhci_cdns3_suspend_quirk,
  29 };
  30
  31 static int __cdns3_host_init(struct cdns3 *cdns)
  32 {
  33         struct platform_device *xhci;
  34         int ret;
  35         struct usb_hcd *hcd;
  36
  37         cdns3_drd_host_on(cdns);
  38
  39         xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
  40         if (!xhci) {
  41                 dev_err(cdns->dev, "couldn't allocate xHCI device\n");
  42                 return -ENOMEM;
  43         }
  44
  45         xhci->dev.parent = cdns->dev;
  46         cdns->host_dev = xhci;
  47
  48         ret = platform_device_add_resources(xhci, cdns->xhci_res,
  49                                             CDNS3_XHCI_RESOURCES_NUM);
  50         if (ret) {
  51                 dev_err(cdns->dev, "couldn't add resources to xHCI device\n");
  52                 goto err1;
  53         }
  54
  55         cdns->xhci_plat_data = kmemdup(&xhci_plat_cdns3_xhci,
  56                         sizeof(struct xhci_plat_priv), GFP_KERNEL);
  57         if (!cdns->xhci_plat_data) {
  58                 ret = -ENOMEM;
  59                 goto err1;
  60         }
  61
  62         if (cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW))
  63                 cdns->xhci_plat_data->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
  64
  65         ret = platform_device_add_data(xhci, cdns->xhci_plat_data,
  66                         sizeof(struct xhci_plat_priv));
  67         if (ret)
  68                 goto free_memory;
  69
  70         ret = platform_device_add(xhci);
  71         if (ret) {
  72                 dev_err(cdns->dev, "failed to register xHCI device\n");
  73                 goto free_memory;
  74         }
  75
  76         /* Glue needs to access xHCI region register for Power management */
  77         hcd = platform_get_drvdata(xhci);
  78         if (hcd)
  79                 cdns->xhci_regs = hcd->regs;
  80
  81         return 0;
  82
  83 free_memory:
  84         kfree(cdns->xhci_plat_data);
  85 err1:
  86         platform_device_put(xhci);
  87         return ret;
  88 }
  89
  90 int xhci_cdns3_suspend_quirk(struct usb_hcd *hcd)
  91 {
  92         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
  93         u32 value;
  94
  95         if (pm_runtime_status_suspended(hcd->self.controller))
  96                 return 0;
  97
  98         /* set usbcmd.EU3S */
  99         value = readl(&xhci->op_regs->command);
 100         value |= CMD_PM_INDEX;
 101         writel(value, &xhci->op_regs->command);
 102
 103         if (hcd->regs) {
 104                 value = readl(hcd->regs + XECP_AUX_CTRL_REG1);
 105                 value |= CFG_RXDET_P3_EN;
 106                 writel(value, hcd->regs + XECP_AUX_CTRL_REG1);
 107
 108                 value = readl(hcd->regs + XECP_PORT_CAP_REG);
 109                 value |= LPM_2_STB_SWITCH_EN;
 110                 writel(value, hcd->regs + XECP_PORT_CAP_REG);
 111         }
 112
 113         return 0;
 114 }
 115
 116 static void cdns3_host_exit(struct cdns3 *cdns)
 117 {
 118         kfree(cdns->xhci_plat_data);
 119         platform_device_unregister(cdns->host_dev);
 120         cdns->host_dev = NULL;
 121         cdns3_drd_host_off(cdns);
 122 }
 123
 124 int cdns3_host_init(struct cdns3 *cdns)
 125 {
 126         struct cdns3_role_driver *rdrv;
 127
 128         rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
 129         if (!rdrv)
 130                 return -ENOMEM;
 131
 132         rdrv->start     = __cdns3_host_init;
 133         rdrv->stop      = cdns3_host_exit;
 134         rdrv->state     = CDNS3_ROLE_STATE_INACTIVE;
 135         rdrv->name      = "host";
 136
 137         cdns->roles[USB_ROLE_HOST] = rdrv;
 138
 139         return 0;
 140 }