Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * host.c - ChipIdea USB host controller driver
4 *
5 * Copyright (c) 2012 Intel Corporation
6 *
7 * Author: Alexander Shishkin
8 */
9
10#include <linux/kernel.h>
11#include <linux/io.h>
12#include <linux/usb.h>
13#include <linux/usb/hcd.h>
14#include <linux/usb/chipidea.h>
15#include <linux/regulator/consumer.h>
16
17#include "../host/ehci.h"
18
19#include "ci.h"
20#include "bits.h"
21#include "host.h"
22
23static struct hc_driver __read_mostly ci_ehci_hc_driver;
24static int (*orig_bus_suspend)(struct usb_hcd *hcd);
25
26struct ehci_ci_priv {
27 struct regulator *reg_vbus;
28};
29
30static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
31{
32 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
33 struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv;
34 struct device *dev = hcd->self.controller;
35 struct ci_hdrc *ci = dev_get_drvdata(dev);
36 int ret = 0;
37 int port = HCS_N_PORTS(ehci->hcs_params);
38
39 if (priv->reg_vbus) {
40 if (port > 1) {
41 dev_warn(dev,
42 "Not support multi-port regulator control\n");
43 return 0;
44 }
45 if (enable)
46 ret = regulator_enable(priv->reg_vbus);
47 else
48 ret = regulator_disable(priv->reg_vbus);
49 if (ret) {
50 dev_err(dev,
51 "Failed to %s vbus regulator, ret=%d\n",
52 enable ? "enable" : "disable", ret);
53 return ret;
54 }
55 }
56
57 if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) {
58 /*
59 * Marvell 28nm HSIC PHY requires forcing the port to HS mode.
60 * As HSIC is always HS, this should be safe for others.
61 */
62 hw_port_test_set(ci, 5);
63 hw_port_test_set(ci, 0);
64 }
65 return 0;
66};
67
68static int ehci_ci_reset(struct usb_hcd *hcd)
69{
70 struct device *dev = hcd->self.controller;
71 struct ci_hdrc *ci = dev_get_drvdata(dev);
72 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
73 int ret;
74
75 ret = ehci_setup(hcd);
76 if (ret)
77 return ret;
78
79 ehci->need_io_watchdog = 0;
80
81 if (ci->platdata->notify_event) {
82 ret = ci->platdata->notify_event(ci,
83 CI_HDRC_CONTROLLER_RESET_EVENT);
84 if (ret)
85 return ret;
86 }
87
88 ci_platform_configure(ci);
89
90 return ret;
91}
92
93static const struct ehci_driver_overrides ehci_ci_overrides = {
94 .extra_priv_size = sizeof(struct ehci_ci_priv),
95 .port_power = ehci_ci_portpower,
96 .reset = ehci_ci_reset,
97};
98
99static irqreturn_t host_irq(struct ci_hdrc *ci)
100{
101 return usb_hcd_irq(ci->irq, ci->hcd);
102}
103
104static int host_start(struct ci_hdrc *ci)
105{
106 struct usb_hcd *hcd;
107 struct ehci_hcd *ehci;
108 struct ehci_ci_priv *priv;
109 int ret;
110
111 if (usb_disabled())
112 return -ENODEV;
113
114 hcd = __usb_create_hcd(&ci_ehci_hc_driver, ci->dev->parent,
115 ci->dev, dev_name(ci->dev), NULL);
116 if (!hcd)
117 return -ENOMEM;
118
119 dev_set_drvdata(ci->dev, ci);
120 hcd->rsrc_start = ci->hw_bank.phys;
121 hcd->rsrc_len = ci->hw_bank.size;
122 hcd->regs = ci->hw_bank.abs;
123 hcd->has_tt = 1;
124
125 hcd->power_budget = ci->platdata->power_budget;
126 hcd->tpl_support = ci->platdata->tpl_support;
127 if (ci->phy)
128 hcd->phy = ci->phy;
129 else
130 hcd->usb_phy = ci->usb_phy;
131
132 ehci = hcd_to_ehci(hcd);
133 ehci->caps = ci->hw_bank.cap;
134 ehci->has_hostpc = ci->hw_bank.lpm;
135 ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
136 ehci->imx28_write_fix = ci->imx28_write_fix;
137
138 priv = (struct ehci_ci_priv *)ehci->priv;
139 priv->reg_vbus = NULL;
140
141 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
142 if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
143 ret = regulator_enable(ci->platdata->reg_vbus);
144 if (ret) {
145 dev_err(ci->dev,
146 "Failed to enable vbus regulator, ret=%d\n",
147 ret);
148 goto put_hcd;
149 }
150 } else {
151 priv->reg_vbus = ci->platdata->reg_vbus;
152 }
153 }
154
155 ret = usb_add_hcd(hcd, 0, 0);
156 if (ret) {
157 goto disable_reg;
158 } else {
159 struct usb_otg *otg = &ci->otg;
160
161 ci->hcd = hcd;
162
163 if (ci_otg_is_fsm_mode(ci)) {
164 otg->host = &hcd->self;
165 hcd->self.otg_port = 1;
166 }
167 }
168
169 return ret;
170
171disable_reg:
172 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
173 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
174 regulator_disable(ci->platdata->reg_vbus);
175put_hcd:
176 usb_put_hcd(hcd);
177
178 return ret;
179}
180
181static void host_stop(struct ci_hdrc *ci)
182{
183 struct usb_hcd *hcd = ci->hcd;
184
185 if (hcd) {
186 if (ci->platdata->notify_event)
187 ci->platdata->notify_event(ci,
188 CI_HDRC_CONTROLLER_STOPPED_EVENT);
189 usb_remove_hcd(hcd);
190 ci->role = CI_ROLE_END;
191 synchronize_irq(ci->irq);
192 usb_put_hcd(hcd);
193 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
194 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
195 regulator_disable(ci->platdata->reg_vbus);
196 }
197 ci->hcd = NULL;
198 ci->otg.host = NULL;
199}
200
201
202void ci_hdrc_host_destroy(struct ci_hdrc *ci)
203{
204 if (ci->role == CI_ROLE_HOST && ci->hcd)
205 host_stop(ci);
206}
207
208static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
209{
210 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
211 int port;
212 u32 tmp;
213
214 int ret = orig_bus_suspend(hcd);
215
216 if (ret)
217 return ret;
218
219 port = HCS_N_PORTS(ehci->hcs_params);
220 while (port--) {
221 u32 __iomem *reg = &ehci->regs->port_status[port];
222 u32 portsc = ehci_readl(ehci, reg);
223
224 if (portsc & PORT_CONNECT) {
225 /*
226 * For chipidea, the resume signal will be ended
227 * automatically, so for remote wakeup case, the
228 * usbcmd.rs may not be set before the resume has
229 * ended if other resume paths consumes too much
230 * time (~24ms), in that case, the SOF will not
231 * send out within 3ms after resume ends, then the
232 * high speed device will enter full speed mode.
233 */
234
235 tmp = ehci_readl(ehci, &ehci->regs->command);
236 tmp |= CMD_RUN;
237 ehci_writel(ehci, tmp, &ehci->regs->command);
238 /*
239 * It needs a short delay between set RS bit and PHCD.
240 */
241 usleep_range(150, 200);
242 break;
243 }
244 }
245
246 return 0;
247}
248
249int ci_hdrc_host_init(struct ci_hdrc *ci)
250{
251 struct ci_role_driver *rdrv;
252
253 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
254 return -ENXIO;
255
256 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
257 if (!rdrv)
258 return -ENOMEM;
259
260 rdrv->start = host_start;
261 rdrv->stop = host_stop;
262 rdrv->irq = host_irq;
263 rdrv->name = "host";
264 ci->roles[CI_ROLE_HOST] = rdrv;
265
266 return 0;
267}
268
269void ci_hdrc_host_driver_init(void)
270{
271 ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
272 orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
273 ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
274}