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 } 144