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
23 static struct hc_driver __read_mostly ci_ehci_hc_driver;
24 static int (*orig_bus_suspend)(struct usb_hcd *hcd);
25
26 struct ehci_ci_priv {
27 struct regulator *reg_vbus;
28 };
29
ehci_ci_portpower(struct usb_hcd * hcd,int portnum,bool enable)30 static 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
ehci_ci_reset(struct usb_hcd * hcd)68 static 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
93 static 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
host_irq(struct ci_hdrc * ci)99 static irqreturn_t host_irq(struct ci_hdrc *ci)
100 {
101 return usb_hcd_irq(ci->irq, ci->hcd);
102 }
103
host_start(struct ci_hdrc * ci)104 static 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 || ci->usb_phy) {
128 hcd->skip_phy_initialization = 1;
129 if (ci->usb_phy)
130 hcd->usb_phy = ci->usb_phy;
131 }
132
133 ehci = hcd_to_ehci(hcd);
134 ehci->caps = ci->hw_bank.cap;
135 ehci->has_hostpc = ci->hw_bank.lpm;
136 ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
137 ehci->imx28_write_fix = ci->imx28_write_fix;
138
139 priv = (struct ehci_ci_priv *)ehci->priv;
140 priv->reg_vbus = NULL;
141
142 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
143 if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
144 ret = regulator_enable(ci->platdata->reg_vbus);
145 if (ret) {
146 dev_err(ci->dev,
147 "Failed to enable vbus regulator, ret=%d\n",
148 ret);
149 goto put_hcd;
150 }
151 } else {
152 priv->reg_vbus = ci->platdata->reg_vbus;
153 }
154 }
155
156 ret = usb_add_hcd(hcd, 0, 0);
157 if (ret) {
158 goto disable_reg;
159 } else {
160 struct usb_otg *otg = &ci->otg;
161
162 ci->hcd = hcd;
163
164 if (ci_otg_is_fsm_mode(ci)) {
165 otg->host = &hcd->self;
166 hcd->self.otg_port = 1;
167 }
168 }
169
170 return ret;
171
172 disable_reg:
173 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
174 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
175 regulator_disable(ci->platdata->reg_vbus);
176 put_hcd:
177 usb_put_hcd(hcd);
178
179 return ret;
180 }
181
host_stop(struct ci_hdrc * ci)182 static void host_stop(struct ci_hdrc *ci)
183 {
184 struct usb_hcd *hcd = ci->hcd;
185
186 if (hcd) {
187 if (ci->platdata->notify_event)
188 ci->platdata->notify_event(ci,
189 CI_HDRC_CONTROLLER_STOPPED_EVENT);
190 usb_remove_hcd(hcd);
191 ci->role = CI_ROLE_END;
192 synchronize_irq(ci->irq);
193 usb_put_hcd(hcd);
194 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
195 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
196 regulator_disable(ci->platdata->reg_vbus);
197 }
198 ci->hcd = NULL;
199 ci->otg.host = NULL;
200 }
201
202
ci_hdrc_host_destroy(struct ci_hdrc * ci)203 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
204 {
205 if (ci->role == CI_ROLE_HOST && ci->hcd)
206 host_stop(ci);
207 }
208
ci_ehci_bus_suspend(struct usb_hcd * hcd)209 static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
210 {
211 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
212 int port;
213 u32 tmp;
214
215 int ret = orig_bus_suspend(hcd);
216
217 if (ret)
218 return ret;
219
220 port = HCS_N_PORTS(ehci->hcs_params);
221 while (port--) {
222 u32 __iomem *reg = &ehci->regs->port_status[port];
223 u32 portsc = ehci_readl(ehci, reg);
224
225 if (portsc & PORT_CONNECT) {
226 /*
227 * For chipidea, the resume signal will be ended
228 * automatically, so for remote wakeup case, the
229 * usbcmd.rs may not be set before the resume has
230 * ended if other resume paths consumes too much
231 * time (~24ms), in that case, the SOF will not
232 * send out within 3ms after resume ends, then the
233 * high speed device will enter full speed mode.
234 */
235
236 tmp = ehci_readl(ehci, &ehci->regs->command);
237 tmp |= CMD_RUN;
238 ehci_writel(ehci, tmp, &ehci->regs->command);
239 /*
240 * It needs a short delay between set RS bit and PHCD.
241 */
242 usleep_range(150, 200);
243 break;
244 }
245 }
246
247 return 0;
248 }
249
ci_hdrc_host_init(struct ci_hdrc * ci)250 int ci_hdrc_host_init(struct ci_hdrc *ci)
251 {
252 struct ci_role_driver *rdrv;
253
254 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
255 return -ENXIO;
256
257 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
258 if (!rdrv)
259 return -ENOMEM;
260
261 rdrv->start = host_start;
262 rdrv->stop = host_stop;
263 rdrv->irq = host_irq;
264 rdrv->name = "host";
265 ci->roles[CI_ROLE_HOST] = rdrv;
266
267 return 0;
268 }
269
ci_hdrc_host_driver_init(void)270 void ci_hdrc_host_driver_init(void)
271 {
272 ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
273 orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
274 ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
275 }
276
