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 .quirks = XHCI_CDNS_SCTX_QUIRK, 67 }; 68 69 static int __cdns_host_init(struct cdns *cdns) 70 { 71 struct platform_device *xhci; 72 int ret; 73 struct usb_hcd *hcd; 74 75 cdns_drd_host_on(cdns); 76 77 xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO); 78 if (!xhci) { 79 dev_err(cdns->dev, "couldn't allocate xHCI device\n"); 80 return -ENOMEM; 81 } 82 83 xhci->dev.parent = cdns->dev; 84 cdns->host_dev = xhci; 85 86 ret = platform_device_add_resources(xhci, cdns->xhci_res, 87 CDNS_XHCI_RESOURCES_NUM); 88 if (ret) { 89 dev_err(cdns->dev, "couldn't add resources to xHCI device\n"); 90 goto err1; 91 } 92 93 if (cdns->version < CDNSP_CONTROLLER_V2) 94 cdns->xhci_plat_data = kmemdup(&xhci_plat_cdns3_xhci, 95 sizeof(struct xhci_plat_priv), GFP_KERNEL); 96 else 97 cdns->xhci_plat_data = kmemdup(&xhci_plat_cdnsp_xhci, 98 sizeof(struct xhci_plat_priv), GFP_KERNEL); 99 100 if (!cdns->xhci_plat_data) { 101 ret = -ENOMEM; 102 goto err1; 103 } 104 105 if (cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW)) 106 cdns->xhci_plat_data->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW; 107 108 ret = platform_device_add_data(xhci, cdns->xhci_plat_data, 109 sizeof(struct xhci_plat_priv)); 110 if (ret) 111 goto free_memory; 112 113 ret = platform_device_add(xhci); 114 if (ret) { 115 dev_err(cdns->dev, "failed to register xHCI device\n"); 116 goto free_memory; 117 } 118 119 /* Glue needs to access xHCI region register for Power management */ 120 hcd = platform_get_drvdata(xhci); 121 if (hcd) 122 cdns->xhci_regs = hcd->regs; 123 124 return 0; 125 126 free_memory: 127 kfree(cdns->xhci_plat_data); 128 err1: 129 platform_device_put(xhci); 130 return ret; 131 } 132 133 static void cdns_host_exit(struct cdns *cdns) 134 { 135 kfree(cdns->xhci_plat_data); 136 platform_device_unregister(cdns->host_dev); 137 cdns->host_dev = NULL; 138 cdns_drd_host_off(cdns); 139 } 140 141 int cdns_host_init(struct cdns *cdns) 142 { 143 struct cdns_role_driver *rdrv; 144 145 rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL); 146 if (!rdrv) 147 return -ENOMEM; 148 149 rdrv->start = __cdns_host_init; 150 rdrv->stop = cdns_host_exit; 151 rdrv->state = CDNS_ROLE_STATE_INACTIVE; 152 rdrv->name = "host"; 153 154 cdns->roles[USB_ROLE_HOST] = rdrv; 155 156 return 0; 157 } 158