host.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * host.c - DesignWare USB3 DRD Controller Host Glue
  4 *
  5 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com
  6 *
  7 * Authors: Felipe Balbi <balbi@ti.com>,
  8 */
  9
 10#include <linux/irq.h>
 11#include <linux/of.h>
 12#include <linux/platform_device.h>
 13#include <linux/usb.h>
 14#include <linux/usb/hcd.h>
 15
 16#include "../host/xhci-port.h"
 17#include "../host/xhci-ext-caps.h"
 18#include "../host/xhci-caps.h"
 19#include "../host/xhci-plat.h"
 20#include "core.h"
 21
 22#define XHCI_HCSPARAMS1		0x4
 23#define XHCI_PORTSC_BASE	0x400
 24
 25/**
 26 * dwc3_power_off_all_roothub_ports - Power off all Root hub ports
 27 * @dwc: Pointer to our controller context structure
 28 */
 29static void dwc3_power_off_all_roothub_ports(struct dwc3 *dwc)
 30{
 31	void __iomem *xhci_regs;
 32	u32 op_regs_base;
 33	int port_num;
 34	u32 offset;
 35	u32 reg;
 36	int i;
 37
 38	/* xhci regs are not mapped yet, do it temporarily here */
 39	if (dwc->xhci_resources[0].start) {
 40		if (dwc->xhci_resources[0].flags & IORESOURCE_MEM_NONPOSTED)
 41			xhci_regs = ioremap_np(dwc->xhci_resources[0].start, DWC3_XHCI_REGS_END);
 42		else
 43			xhci_regs = ioremap(dwc->xhci_resources[0].start, DWC3_XHCI_REGS_END);
 44		if (!xhci_regs) {
 45			dev_err(dwc->dev, "Failed to ioremap xhci_regs\n");
 46			return;
 47		}
 48
 49		op_regs_base = HC_LENGTH(readl(xhci_regs));
 50		reg = readl(xhci_regs + XHCI_HCSPARAMS1);
 51		port_num = HCS_MAX_PORTS(reg);
 52
 53		for (i = 1; i <= port_num; i++) {
 54			offset = op_regs_base + XHCI_PORTSC_BASE + 0x10 * (i - 1);
 55			reg = readl(xhci_regs + offset);
 56			reg &= ~PORT_POWER;
 57			writel(reg, xhci_regs + offset);
 58		}
 59
 60		iounmap(xhci_regs);
 61	} else {
 62		dev_err(dwc->dev, "xhci base reg invalid\n");
 63	}
 64}
 65
 66static void dwc3_xhci_plat_start(struct usb_hcd *hcd)
 67{
 68	struct platform_device *pdev;
 69	struct dwc3 *dwc;
 70
 71	if (!usb_hcd_is_primary_hcd(hcd))
 72		return;
 73
 74	pdev = to_platform_device(hcd->self.controller);
 75	dwc = dev_get_drvdata(pdev->dev.parent);
 76
 77	dwc3_enable_susphy(dwc, true);
 78}
 79
 80static const struct xhci_plat_priv dwc3_xhci_plat_quirk = {
 81	.plat_start = dwc3_xhci_plat_start,
 82};
 83
 84static void dwc3_host_fill_xhci_irq_res(struct dwc3 *dwc,
 85					int irq, char *name)
 86{
 87	struct platform_device *pdev = to_platform_device(dwc->dev);
 88	struct device_node *np = dev_of_node(&pdev->dev);
 89
 90	dwc->xhci_resources[1].start = irq;
 91	dwc->xhci_resources[1].end = irq;
 92	dwc->xhci_resources[1].flags = IORESOURCE_IRQ | irq_get_trigger_type(irq);
 93	if (!name && np)
 94		dwc->xhci_resources[1].name = of_node_full_name(pdev->dev.of_node);
 95	else
 96		dwc->xhci_resources[1].name = name;
 97}
 98
 99static int dwc3_host_get_irq(struct dwc3 *dwc)
100{
101	struct platform_device	*dwc3_pdev = to_platform_device(dwc->dev);
102	int irq;
103
104	irq = platform_get_irq_byname_optional(dwc3_pdev, "host");
105	if (irq > 0) {
106		dwc3_host_fill_xhci_irq_res(dwc, irq, "host");
107		goto out;
108	}
109
110	if (irq == -EPROBE_DEFER)
111		goto out;
112
113	irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
114	if (irq > 0) {
115		dwc3_host_fill_xhci_irq_res(dwc, irq, "dwc_usb3");
116		goto out;
117	}
118
119	if (irq == -EPROBE_DEFER)
120		goto out;
121
122	irq = platform_get_irq(dwc3_pdev, 0);
123	if (irq > 0)
124		dwc3_host_fill_xhci_irq_res(dwc, irq, NULL);
125
126out:
127	return irq;
128}
129
130int dwc3_host_init(struct dwc3 *dwc)
131{
132	struct property_entry	props[6];
133	struct platform_device	*xhci;
134	int			ret, irq;
135	int			prop_idx = 0;
136
137	/*
138	 * Some platforms need to power off all Root hub ports immediately after DWC3 set to host
139	 * mode to avoid VBUS glitch happen when xhci get reset later.
140	 */
141	dwc3_power_off_all_roothub_ports(dwc);
142
143	irq = dwc3_host_get_irq(dwc);
144	if (irq < 0)
145		return irq;
146
147	xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
148	if (!xhci) {
149		dev_err(dwc->dev, "couldn't allocate xHCI device\n");
150		return -ENOMEM;
151	}
152
153	xhci->dev.parent	= dwc->dev;
154
155	dwc->xhci = xhci;
156
157	ret = platform_device_add_resources(xhci, dwc->xhci_resources,
158						DWC3_XHCI_RESOURCES_NUM);
159	if (ret) {
160		dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
161		goto err;
162	}
163
164	memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
165
166	props[prop_idx++] = PROPERTY_ENTRY_BOOL("xhci-sg-trb-cache-size-quirk");
167
168	props[prop_idx++] = PROPERTY_ENTRY_BOOL("write-64-hi-lo-quirk");
169
170	if (dwc->usb3_lpm_capable)
171		props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable");
172
173	if (dwc->usb2_lpm_disable)
174		props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb2-lpm-disable");
175
176	/**
177	 * WORKAROUND: dwc3 revisions <=3.00a have a limitation
178	 * where Port Disable command doesn't work.
179	 *
180	 * The suggested workaround is that we avoid Port Disable
181	 * completely.
182	 *
183	 * This following flag tells XHCI to do just that.
184	 */
185	if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A))
186		props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped");
187
188	props[prop_idx++] = PROPERTY_ENTRY_U16("num-hc-interrupters",
189					       dwc->num_hc_interrupters);
190
191	if (prop_idx) {
192		ret = device_create_managed_software_node(&xhci->dev, props, NULL);
193		if (ret) {
194			dev_err(dwc->dev, "failed to add properties to xHCI\n");
195			goto err;
196		}
197	}
198
199	ret = platform_device_add_data(xhci, &dwc3_xhci_plat_quirk,
200				       sizeof(struct xhci_plat_priv));
201	if (ret)
202		goto err;
203
204	ret = platform_device_add(xhci);
205	if (ret) {
206		dev_err(dwc->dev, "failed to register xHCI device\n");
207		goto err;
208	}
209
210	if (dwc->sys_wakeup) {
211		/* Restore wakeup setting if switched from device */
212		device_wakeup_enable(dwc->sysdev);
213
214		/* Pass on wakeup setting to the new xhci platform device */
215		device_init_wakeup(&xhci->dev, true);
216	}
217
218	return 0;
219err:
220	platform_device_put(xhci);
221	return ret;
222}
223EXPORT_SYMBOL_GPL(dwc3_host_init);
224
225void dwc3_host_exit(struct dwc3 *dwc)
226{
227	if (dwc->sys_wakeup)
228		device_init_wakeup(&dwc->xhci->dev, false);
229
230	dwc3_enable_susphy(dwc, true);
231	platform_device_unregister(dwc->xhci);
232	dwc->xhci = NULL;
233}
234EXPORT_SYMBOL_GPL(dwc3_host_exit);