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 <peter.chen@nxp.com>
   9  *          Pawel Laszczak <pawell@cadence.com>
  10  */
  11
  12 #include <linux/platform_device.h>
  13 #include <linux/slab.h>
  14 #include "core.h"
  15 #include "drd.h"
  16 #include "host-export.h"
  17 #include <linux/usb/hcd.h>
  18 #include "../host/xhci.h"
  19 #include "../host/xhci-plat.h"
  20
  21 #define XECP_PORT_CAP_REG       0x8000
  22 #define XECP_AUX_CTRL_REG1      0x8120
  23
  24 #define CFG_RXDET_P3_EN         BIT(15)
  25 #define LPM_2_STB_SWITCH_EN     BIT(25)
  26
  27 static void xhci_cdns3_plat_start(struct usb_hcd *hcd)
  28 {
  29         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
  30         u32 value;
  31
  32         /* set usbcmd.EU3S */
  33         value = readl(&xhci->op_regs->command);
  34         value |= CMD_PM_INDEX;
  35         writel(value, &xhci->op_regs->command);
  36
  37         if (hcd->regs) {
  38                 value = readl(hcd->regs + XECP_AUX_CTRL_REG1);
  39                 value |= CFG_RXDET_P3_EN;
  40                 writel(value, hcd->regs + XECP_AUX_CTRL_REG1);
  41
  42                 value = readl(hcd->regs + XECP_PORT_CAP_REG);
  43                 value |= LPM_2_STB_SWITCH_EN;
  44                 writel(value, hcd->regs + XECP_PORT_CAP_REG);
  45         }
  46 }
  47
  48 static int xhci_cdns3_resume_quirk(struct usb_hcd *hcd)
  49 {
  50         xhci_cdns3_plat_start(hcd);
  51         return 0;
  52 }
  53
  54 static const struct xhci_plat_priv xhci_plat_cdns3_xhci = {
  55         .quirks = XHCI_SKIP_PHY_INIT | XHCI_AVOID_BEI,
  56         .plat_start = xhci_cdns3_plat_start,
  57         .resume_quirk = xhci_cdns3_resume_quirk,
  58 };
  59
  60 static int __cdns_host_init(struct cdns *cdns)
  61 {
  62         struct platform_device *xhci;
  63         int ret;
  64         struct usb_hcd *hcd;
  65
  66         cdns_drd_host_on(cdns);
  67
  68         xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
  69         if (!xhci) {
  70                 dev_err(cdns->dev, "couldn't allocate xHCI device\n");
  71                 return -ENOMEM;
  72         }
  73
  74         xhci->dev.parent = cdns->dev;
  75         cdns->host_dev = xhci;
  76
  77         ret = platform_device_add_resources(xhci, cdns->xhci_res,
  78                                             CDNS_XHCI_RESOURCES_NUM);
  79         if (ret) {
  80                 dev_err(cdns->dev, "couldn't add resources to xHCI device\n");
  81                 goto err1;
  82         }
  83
  84         cdns->xhci_plat_data = kmemdup(&xhci_plat_cdns3_xhci,
  85                         sizeof(struct xhci_plat_priv), GFP_KERNEL);
  86         if (!cdns->xhci_plat_data) {
  87                 ret = -ENOMEM;
  88                 goto err1;
  89         }
  90
  91         if (cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW))
  92                 cdns->xhci_plat_data->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
  93
  94         ret = platform_device_add_data(xhci, cdns->xhci_plat_data,
  95                         sizeof(struct xhci_plat_priv));
  96         if (ret)
  97                 goto free_memory;
  98
  99         ret = platform_device_add(xhci);
 100         if (ret) {
 101                 dev_err(cdns->dev, "failed to register xHCI device\n");
 102                 goto free_memory;
 103         }
 104
 105         /* Glue needs to access xHCI region register for Power management */
 106         hcd = platform_get_drvdata(xhci);
 107         if (hcd)
 108                 cdns->xhci_regs = hcd->regs;
 109
 110         return 0;
 111
 112 free_memory:
 113         kfree(cdns->xhci_plat_data);
 114 err1:
 115         platform_device_put(xhci);
 116         return ret;
 117 }
 118
 119 static void cdns_host_exit(struct cdns *cdns)
 120 {
 121         kfree(cdns->xhci_plat_data);
 122         platform_device_unregister(cdns->host_dev);
 123         cdns->host_dev = NULL;
 124         cdns_drd_host_off(cdns);
 125 }
 126
 127 int cdns_host_init(struct cdns *cdns)
 128 {
 129         struct cdns_role_driver *rdrv;
 130
 131         rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
 132         if (!rdrv)
 133                 return -ENOMEM;
 134
 135         rdrv->start     = __cdns_host_init;
 136         rdrv->stop      = cdns_host_exit;
 137         rdrv->state     = CDNS_ROLE_STATE_INACTIVE;
 138         rdrv->name      = "host";
 139
 140         cdns->roles[USB_ROLE_HOST] = rdrv;
 141
 142         return 0;
 143 }