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 18 static int __cdns3_host_init(struct cdns3 *cdns) 19 { 20 struct platform_device *xhci; 21 int ret; 22 struct usb_hcd *hcd; 23 24 cdns3_drd_host_on(cdns); 25 26 xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO); 27 if (!xhci) { 28 dev_err(cdns->dev, "couldn't allocate xHCI device\n"); 29 return -ENOMEM; 30 } 31 32 xhci->dev.parent = cdns->dev; 33 cdns->host_dev = xhci; 34 35 ret = platform_device_add_resources(xhci, cdns->xhci_res, 36 CDNS3_XHCI_RESOURCES_NUM); 37 if (ret) { 38 dev_err(cdns->dev, "couldn't add resources to xHCI device\n"); 39 goto err1; 40 } 41 42 ret = platform_device_add(xhci); 43 if (ret) { 44 dev_err(cdns->dev, "failed to register xHCI device\n"); 45 goto err1; 46 } 47 48 /* Glue needs to access xHCI region register for Power management */ 49 hcd = platform_get_drvdata(xhci); 50 if (hcd) 51 cdns->xhci_regs = hcd->regs; 52 53 return 0; 54 err1: 55 platform_device_put(xhci); 56 return ret; 57 } 58 59 static void cdns3_host_exit(struct cdns3 *cdns) 60 { 61 platform_device_unregister(cdns->host_dev); 62 cdns->host_dev = NULL; 63 cdns3_drd_host_off(cdns); 64 } 65 66 int cdns3_host_init(struct cdns3 *cdns) 67 { 68 struct cdns3_role_driver *rdrv; 69 70 rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL); 71 if (!rdrv) 72 return -ENOMEM; 73 74 rdrv->start = __cdns3_host_init; 75 rdrv->stop = cdns3_host_exit; 76 rdrv->state = CDNS3_ROLE_STATE_INACTIVE; 77 rdrv->name = "host"; 78 79 cdns->roles[USB_ROLE_HOST] = rdrv; 80 81 return 0; 82 } 83