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 /*
  22  * The XECP_PORT_CAP_REG and XECP_AUX_CTRL_REG1 exist only
  23  * in Cadence USB3 dual-role controller, so it can't be used
  24  * with Cadence CDNSP dual-role controller.
  25  */
  26 #define XECP_PORT_CAP_REG       0x8000
  27 #define XECP_AUX_CTRL_REG1      0x8120
  28
  29 #define CFG_RXDET_P3_EN         BIT(15)
  30 #define LPM_2_STB_SWITCH_EN     BIT(25)
  31
  32 static void xhci_cdns3_plat_start(struct usb_hcd *hcd)
  33 {
  34         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
  35         u32 value;
  36
  37         /* set usbcmd.EU3S */
  38         value = readl(&xhci->op_regs->command);
  39         value |= CMD_PM_INDEX;
  40         writel(value, &xhci->op_regs->command);
  41
  42         if (hcd->regs) {
  43                 value = readl(hcd->regs + XECP_AUX_CTRL_REG1);
  44                 value |= CFG_RXDET_P3_EN;
  45                 writel(value, hcd->regs + XECP_AUX_CTRL_REG1);
  46
  47                 value = readl(hcd->regs + XECP_PORT_CAP_REG);
  48                 value |= LPM_2_STB_SWITCH_EN;
  49                 writel(value, hcd->regs + XECP_PORT_CAP_REG);
  50         }
  51 }
  52
  53 static int xhci_cdns3_resume_quirk(struct usb_hcd *hcd)
  54 {
  55         xhci_cdns3_plat_start(hcd);
  56         return 0;
  57 }
  58
  59 static const struct xhci_plat_priv xhci_plat_cdns3_xhci = {
  60         .quirks = XHCI_SKIP_PHY_INIT | XHCI_AVOID_BEI,
  61         .plat_start = xhci_cdns3_plat_start,
  62         .resume_quirk = xhci_cdns3_resume_quirk,
  63 };
  64
  65 static const struct xhci_plat_priv xhci_plat_cdnsp_xhci;
  66
  67 static int __cdns_host_init(struct cdns *cdns)
  68 {
  69         struct platform_device *xhci;
  70         int ret;
  71         struct usb_hcd *hcd;
  72
  73         cdns_drd_host_on(cdns);
  74
  75         xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
  76         if (!xhci) {
  77                 dev_err(cdns->dev, "couldn't allocate xHCI device\n");
  78                 return -ENOMEM;
  79         }
  80
  81         xhci->dev.parent = cdns->dev;
  82         cdns->host_dev = xhci;
  83
  84         ret = platform_device_add_resources(xhci, cdns->xhci_res,
  85                                             CDNS_XHCI_RESOURCES_NUM);
  86         if (ret) {
  87                 dev_err(cdns->dev, "couldn't add resources to xHCI device\n");
  88                 goto err1;
  89         }
  90
  91         if (cdns->version < CDNSP_CONTROLLER_V2)
  92                 cdns->xhci_plat_data = kmemdup(&xhci_plat_cdns3_xhci,
  93                                 sizeof(struct xhci_plat_priv), GFP_KERNEL);
  94         else
  95                 cdns->xhci_plat_data = kmemdup(&xhci_plat_cdnsp_xhci,
  96                                 sizeof(struct xhci_plat_priv), GFP_KERNEL);
  97
  98         if (!cdns->xhci_plat_data) {
  99                 ret = -ENOMEM;
 100                 goto err1;
 101         }
 102
 103         if (cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW))
 104                 cdns->xhci_plat_data->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
 105
 106         ret = platform_device_add_data(xhci, cdns->xhci_plat_data,
 107                         sizeof(struct xhci_plat_priv));
 108         if (ret)
 109                 goto free_memory;
 110
 111         ret = platform_device_add(xhci);
 112         if (ret) {
 113                 dev_err(cdns->dev, "failed to register xHCI device\n");
 114                 goto free_memory;
 115         }
 116
 117         /* Glue needs to access xHCI region register for Power management */
 118         hcd = platform_get_drvdata(xhci);
 119         if (hcd)
 120                 cdns->xhci_regs = hcd->regs;
 121
 122         return 0;
 123
 124 free_memory:
 125         kfree(cdns->xhci_plat_data);
 126 err1:
 127         platform_device_put(xhci);
 128         return ret;
 129 }
 130
 131 static void cdns_host_exit(struct cdns *cdns)
 132 {
 133         kfree(cdns->xhci_plat_data);
 134         platform_device_unregister(cdns->host_dev);
 135         cdns->host_dev = NULL;
 136         cdns_drd_host_off(cdns);
 137 }
 138
 139 int cdns_host_init(struct cdns *cdns)
 140 {
 141         struct cdns_role_driver *rdrv;
 142
 143         rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
 144         if (!rdrv)
 145                 return -ENOMEM;
 146
 147         rdrv->start     = __cdns_host_init;
 148         rdrv->stop      = cdns_host_exit;
 149         rdrv->state     = CDNS_ROLE_STATE_INACTIVE;
 150         rdrv->name      = "host";
 151
 152         cdns->roles[USB_ROLE_HOST] = rdrv;
 153
 154         return 0;
 155 }