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 } 156