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