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 */
dwc3_power_off_all_roothub_ports(struct dwc3 * dwc)29 static 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
dwc3_xhci_plat_start(struct usb_hcd * hcd)66 static 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
80 static const struct xhci_plat_priv dwc3_xhci_plat_quirk = {
81 .plat_start = dwc3_xhci_plat_start,
82 };
83
dwc3_host_fill_xhci_irq_res(struct dwc3 * dwc,int irq,char * name)84 static 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
dwc3_host_get_irq(struct dwc3 * dwc)99 static 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
126 out:
127 return irq;
128 }
129
dwc3_host_init(struct dwc3 * dwc)130 int 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;
219 err:
220 platform_device_put(xhci);
221 return ret;
222 }
223 EXPORT_SYMBOL_GPL(dwc3_host_init);
224
dwc3_host_exit(struct dwc3 * dwc)225 void 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, false);
231 platform_device_unregister(dwc->xhci);
232 dwc->xhci = NULL;
233 }
234 EXPORT_SYMBOL_GPL(dwc3_host_exit);
235