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 "core.h"
 14#include "drd.h"
 15#include "host-export.h"
 16#include <linux/usb/hcd.h>
 17#include "../host/xhci.h"
 18#include "../host/xhci-plat.h"
 19
 20#define XECP_PORT_CAP_REG	0x8000
 21#define XECP_AUX_CTRL_REG1	0x8120
 22
 23#define CFG_RXDET_P3_EN		BIT(15)
 24#define LPM_2_STB_SWITCH_EN	BIT(25)
 25
 26static int xhci_cdns3_suspend_quirk(struct usb_hcd *hcd);
 27
 28static const struct xhci_plat_priv xhci_plat_cdns3_xhci = {
 29	.quirks = XHCI_SKIP_PHY_INIT | XHCI_AVOID_BEI,
 30	.suspend_quirk = xhci_cdns3_suspend_quirk,
 31};
 32
 33static int __cdns_host_init(struct cdns *cdns)
 34{
 35	struct platform_device *xhci;
 36	int ret;
 37	struct usb_hcd *hcd;
 38
 39	cdns_drd_host_on(cdns);
 40
 41	xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
 42	if (!xhci) {
 43		dev_err(cdns->dev, "couldn't allocate xHCI device\n");
 44		return -ENOMEM;
 45	}
 46
 47	xhci->dev.parent = cdns->dev;
 48	cdns->host_dev = xhci;
 49
 50	ret = platform_device_add_resources(xhci, cdns->xhci_res,
 51					    CDNS_XHCI_RESOURCES_NUM);
 52	if (ret) {
 53		dev_err(cdns->dev, "couldn't add resources to xHCI device\n");
 54		goto err1;
 55	}
 56
 57	cdns->xhci_plat_data = kmemdup(&xhci_plat_cdns3_xhci,
 58			sizeof(struct xhci_plat_priv), GFP_KERNEL);
 59	if (!cdns->xhci_plat_data) {
 60		ret = -ENOMEM;
 61		goto err1;
 62	}
 63
 64	if (cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW))
 65		cdns->xhci_plat_data->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
 66
 67	ret = platform_device_add_data(xhci, cdns->xhci_plat_data,
 68			sizeof(struct xhci_plat_priv));
 69	if (ret)
 70		goto free_memory;
 71
 72	ret = platform_device_add(xhci);
 73	if (ret) {
 74		dev_err(cdns->dev, "failed to register xHCI device\n");
 75		goto free_memory;
 76	}
 77
 78	/* Glue needs to access xHCI region register for Power management */
 79	hcd = platform_get_drvdata(xhci);
 80	if (hcd)
 81		cdns->xhci_regs = hcd->regs;
 82
 83	return 0;
 84
 85free_memory:
 86	kfree(cdns->xhci_plat_data);
 87err1:
 88	platform_device_put(xhci);
 89	return ret;
 90}
 91
 92static int xhci_cdns3_suspend_quirk(struct usb_hcd *hcd)
 93{
 94	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
 95	u32 value;
 96
 97	if (pm_runtime_status_suspended(hcd->self.controller))
 98		return 0;
 99
100	/* set usbcmd.EU3S */
101	value = readl(&xhci->op_regs->command);
102	value |= CMD_PM_INDEX;
103	writel(value, &xhci->op_regs->command);
104
105	if (hcd->regs) {
106		value = readl(hcd->regs + XECP_AUX_CTRL_REG1);
107		value |= CFG_RXDET_P3_EN;
108		writel(value, hcd->regs + XECP_AUX_CTRL_REG1);
109
110		value = readl(hcd->regs + XECP_PORT_CAP_REG);
111		value |= LPM_2_STB_SWITCH_EN;
112		writel(value, hcd->regs + XECP_PORT_CAP_REG);
113	}
114
115	return 0;
116}
117
118static void cdns_host_exit(struct cdns *cdns)
119{
120	kfree(cdns->xhci_plat_data);
121	platform_device_unregister(cdns->host_dev);
122	cdns->host_dev = NULL;
123	cdns_drd_host_off(cdns);
124}
125
126int cdns_host_init(struct cdns *cdns)
127{
128	struct cdns_role_driver *rdrv;
129
130	rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
131	if (!rdrv)
132		return -ENOMEM;
133
134	rdrv->start	= __cdns_host_init;
135	rdrv->stop	= cdns_host_exit;
136	rdrv->state	= CDNS_ROLE_STATE_INACTIVE;
137	rdrv->name	= "host";
138
139	cdns->roles[USB_ROLE_HOST] = rdrv;
140
141	return 0;
142}