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 #include <linux/pinctrl/consumer.h>
17
18 #include "../host/ehci.h"
19
20 #include "ci.h"
21 #include "bits.h"
22 #include "host.h"
23
24 static struct hc_driver __read_mostly ci_ehci_hc_driver;
25 static int (*orig_bus_suspend)(struct usb_hcd *hcd);
26
27 struct ehci_ci_priv {
28 struct regulator *reg_vbus;
29 bool enabled;
30 };
31
ehci_ci_portpower(struct usb_hcd * hcd,int portnum,bool enable)32 static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
33 {
34 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
35 struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv;
36 struct device *dev = hcd->self.controller;
37 struct ci_hdrc *ci = dev_get_drvdata(dev);
38 int ret = 0;
39 int port = HCS_N_PORTS(ehci->hcs_params);
40
41 if (priv->reg_vbus && enable != priv->enabled) {
42 if (port > 1) {
43 dev_warn(dev,
44 "Not support multi-port regulator control\n");
45 return 0;
46 }
47 if (enable)
48 ret = regulator_enable(priv->reg_vbus);
49 else
50 ret = regulator_disable(priv->reg_vbus);
51 if (ret) {
52 dev_err(dev,
53 "Failed to %s vbus regulator, ret=%d\n",
54 enable ? "enable" : "disable", ret);
55 return ret;
56 }
57 priv->enabled = enable;
58 }
59
60 if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) {
61 /*
62 * Marvell 28nm HSIC PHY requires forcing the port to HS mode.
63 * As HSIC is always HS, this should be safe for others.
64 */
65 hw_port_test_set(ci, 5);
66 hw_port_test_set(ci, 0);
67 }
68 return 0;
69 };
70
ehci_ci_reset(struct usb_hcd * hcd)71 static int ehci_ci_reset(struct usb_hcd *hcd)
72 {
73 struct device *dev = hcd->self.controller;
74 struct ci_hdrc *ci = dev_get_drvdata(dev);
75 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
76 int ret;
77
78 ret = ehci_setup(hcd);
79 if (ret)
80 return ret;
81
82 ehci->need_io_watchdog = 0;
83
84 if (ci->platdata->notify_event) {
85 ret = ci->platdata->notify_event(ci,
86 CI_HDRC_CONTROLLER_RESET_EVENT);
87 if (ret)
88 return ret;
89 }
90
91 ci_platform_configure(ci);
92
93 return ret;
94 }
95
96 static const struct ehci_driver_overrides ehci_ci_overrides = {
97 .extra_priv_size = sizeof(struct ehci_ci_priv),
98 .port_power = ehci_ci_portpower,
99 .reset = ehci_ci_reset,
100 };
101
host_irq(struct ci_hdrc * ci)102 static irqreturn_t host_irq(struct ci_hdrc *ci)
103 {
104 return usb_hcd_irq(ci->irq, ci->hcd);
105 }
106
host_start(struct ci_hdrc * ci)107 static int host_start(struct ci_hdrc *ci)
108 {
109 struct usb_hcd *hcd;
110 struct ehci_hcd *ehci;
111 struct ehci_ci_priv *priv;
112 int ret;
113
114 if (usb_disabled())
115 return -ENODEV;
116
117 hcd = __usb_create_hcd(&ci_ehci_hc_driver, ci->dev->parent,
118 ci->dev, dev_name(ci->dev), NULL);
119 if (!hcd)
120 return -ENOMEM;
121
122 dev_set_drvdata(ci->dev, ci);
123 hcd->rsrc_start = ci->hw_bank.phys;
124 hcd->rsrc_len = ci->hw_bank.size;
125 hcd->regs = ci->hw_bank.abs;
126 hcd->has_tt = 1;
127
128 hcd->power_budget = ci->platdata->power_budget;
129 hcd->tpl_support = ci->platdata->tpl_support;
130 if (ci->phy || ci->usb_phy) {
131 hcd->skip_phy_initialization = 1;
132 if (ci->usb_phy)
133 hcd->usb_phy = ci->usb_phy;
134 }
135
136 ehci = hcd_to_ehci(hcd);
137 ehci->caps = ci->hw_bank.cap;
138 ehci->has_hostpc = ci->hw_bank.lpm;
139 ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
140 ehci->imx28_write_fix = ci->imx28_write_fix;
141
142 priv = (struct ehci_ci_priv *)ehci->priv;
143 priv->reg_vbus = NULL;
144
145 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
146 if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
147 ret = regulator_enable(ci->platdata->reg_vbus);
148 if (ret) {
149 dev_err(ci->dev,
150 "Failed to enable vbus regulator, ret=%d\n",
151 ret);
152 goto put_hcd;
153 }
154 } else {
155 priv->reg_vbus = ci->platdata->reg_vbus;
156 }
157 }
158
159 if (ci->platdata->pins_host)
160 pinctrl_select_state(ci->platdata->pctl,
161 ci->platdata->pins_host);
162
163 ret = usb_add_hcd(hcd, 0, 0);
164 if (ret) {
165 goto disable_reg;
166 } else {
167 struct usb_otg *otg = &ci->otg;
168
169 ci->hcd = hcd;
170
171 if (ci_otg_is_fsm_mode(ci)) {
172 otg->host = &hcd->self;
173 hcd->self.otg_port = 1;
174 }
175
176 if (ci->platdata->notify_event &&
177 (ci->platdata->flags & CI_HDRC_IMX_IS_HSIC))
178 ci->platdata->notify_event
179 (ci, CI_HDRC_IMX_HSIC_ACTIVE_EVENT);
180 }
181
182 return ret;
183
184 disable_reg:
185 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
186 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
187 regulator_disable(ci->platdata->reg_vbus);
188 put_hcd:
189 usb_put_hcd(hcd);
190
191 return ret;
192 }
193
host_stop(struct ci_hdrc * ci)194 static void host_stop(struct ci_hdrc *ci)
195 {
196 struct usb_hcd *hcd = ci->hcd;
197
198 if (hcd) {
199 if (ci->platdata->notify_event)
200 ci->platdata->notify_event(ci,
201 CI_HDRC_CONTROLLER_STOPPED_EVENT);
202 usb_remove_hcd(hcd);
203 ci->role = CI_ROLE_END;
204 synchronize_irq(ci->irq);
205 usb_put_hcd(hcd);
206 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
207 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
208 regulator_disable(ci->platdata->reg_vbus);
209 }
210 ci->hcd = NULL;
211 ci->otg.host = NULL;
212
213 if (ci->platdata->pins_host && ci->platdata->pins_default)
214 pinctrl_select_state(ci->platdata->pctl,
215 ci->platdata->pins_default);
216 }
217
218
ci_hdrc_host_destroy(struct ci_hdrc * ci)219 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
220 {
221 if (ci->role == CI_ROLE_HOST && ci->hcd)
222 host_stop(ci);
223 }
224
225 /* The below code is based on tegra ehci driver */
ci_ehci_hub_control(struct usb_hcd * hcd,u16 typeReq,u16 wValue,u16 wIndex,char * buf,u16 wLength)226 static int ci_ehci_hub_control(
227 struct usb_hcd *hcd,
228 u16 typeReq,
229 u16 wValue,
230 u16 wIndex,
231 char *buf,
232 u16 wLength
233 )
234 {
235 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
236 u32 __iomem *status_reg;
237 u32 temp;
238 unsigned long flags;
239 int retval = 0;
240 struct device *dev = hcd->self.controller;
241 struct ci_hdrc *ci = dev_get_drvdata(dev);
242
243 status_reg = &ehci->regs->port_status[(wIndex & 0xff) - 1];
244
245 spin_lock_irqsave(&ehci->lock, flags);
246
247 if (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_SUSPEND) {
248 temp = ehci_readl(ehci, status_reg);
249 if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) != 0) {
250 retval = -EPIPE;
251 goto done;
252 }
253
254 temp &= ~(PORT_RWC_BITS | PORT_WKCONN_E);
255 temp |= PORT_WKDISC_E | PORT_WKOC_E;
256 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
257
258 /*
259 * If a transaction is in progress, there may be a delay in
260 * suspending the port. Poll until the port is suspended.
261 */
262 if (ehci_handshake(ehci, status_reg, PORT_SUSPEND,
263 PORT_SUSPEND, 5000))
264 ehci_err(ehci, "timeout waiting for SUSPEND\n");
265
266 if (ci->platdata->flags & CI_HDRC_IMX_IS_HSIC) {
267 if (ci->platdata->notify_event)
268 ci->platdata->notify_event(ci,
269 CI_HDRC_IMX_HSIC_SUSPEND_EVENT);
270
271 temp = ehci_readl(ehci, status_reg);
272 temp &= ~(PORT_WKDISC_E | PORT_WKCONN_E);
273 ehci_writel(ehci, temp, status_reg);
274 }
275
276 set_bit((wIndex & 0xff) - 1, &ehci->suspended_ports);
277 goto done;
278 }
279
280 /*
281 * After resume has finished, it needs do some post resume
282 * operation for some SoCs.
283 */
284 else if (typeReq == ClearPortFeature &&
285 wValue == USB_PORT_FEAT_C_SUSPEND) {
286 /* Make sure the resume has finished, it should be finished */
287 if (ehci_handshake(ehci, status_reg, PORT_RESUME, 0, 25000))
288 ehci_err(ehci, "timeout waiting for resume\n");
289 }
290
291 spin_unlock_irqrestore(&ehci->lock, flags);
292
293 /* Handle the hub control events here */
294 return ehci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
295 done:
296 spin_unlock_irqrestore(&ehci->lock, flags);
297 return retval;
298 }
ci_ehci_bus_suspend(struct usb_hcd * hcd)299 static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
300 {
301 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
302 struct device *dev = hcd->self.controller;
303 struct ci_hdrc *ci = dev_get_drvdata(dev);
304 int port;
305 u32 tmp;
306
307 int ret = orig_bus_suspend(hcd);
308
309 if (ret)
310 return ret;
311
312 port = HCS_N_PORTS(ehci->hcs_params);
313 while (port--) {
314 u32 __iomem *reg = &ehci->regs->port_status[port];
315 u32 portsc = ehci_readl(ehci, reg);
316
317 if (portsc & PORT_CONNECT) {
318 /*
319 * For chipidea, the resume signal will be ended
320 * automatically, so for remote wakeup case, the
321 * usbcmd.rs may not be set before the resume has
322 * ended if other resume paths consumes too much
323 * time (~24ms), in that case, the SOF will not
324 * send out within 3ms after resume ends, then the
325 * high speed device will enter full speed mode.
326 */
327
328 tmp = ehci_readl(ehci, &ehci->regs->command);
329 tmp |= CMD_RUN;
330 ehci_writel(ehci, tmp, &ehci->regs->command);
331 /*
332 * It needs a short delay between set RS bit and PHCD.
333 */
334 usleep_range(150, 200);
335 /*
336 * Need to clear WKCN and WKOC for imx HSIC,
337 * otherwise, there will be wakeup event.
338 */
339 if (ci->platdata->flags & CI_HDRC_IMX_IS_HSIC) {
340 tmp = ehci_readl(ehci, reg);
341 tmp &= ~(PORT_WKDISC_E | PORT_WKCONN_E);
342 ehci_writel(ehci, tmp, reg);
343 }
344
345 break;
346 }
347 }
348
349 return 0;
350 }
351
ci_hdrc_host_init(struct ci_hdrc * ci)352 int ci_hdrc_host_init(struct ci_hdrc *ci)
353 {
354 struct ci_role_driver *rdrv;
355
356 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
357 return -ENXIO;
358
359 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
360 if (!rdrv)
361 return -ENOMEM;
362
363 rdrv->start = host_start;
364 rdrv->stop = host_stop;
365 rdrv->irq = host_irq;
366 rdrv->name = "host";
367 ci->roles[CI_ROLE_HOST] = rdrv;
368
369 return 0;
370 }
371
ci_hdrc_host_driver_init(void)372 void ci_hdrc_host_driver_init(void)
373 {
374 ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
375 orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
376 ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
377 ci_ehci_hc_driver.hub_control = ci_ehci_hub_control;
378 }
379
