1 /*
2 * host.c - ChipIdea USB host controller driver
3 *
4 * Copyright (c) 2012 Intel Corporation
5 *
6 * Author: Alexander Shishkin
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #include <linux/kernel.h>
23 #include <linux/io.h>
24 #include <linux/usb.h>
25 #include <linux/usb/hcd.h>
26 #include <linux/usb/chipidea.h>
27 #include <linux/regulator/consumer.h>
28
29 #include "../host/ehci.h"
30
31 #include "ci.h"
32 #include "bits.h"
33 #include "host.h"
34
35 static struct hc_driver __read_mostly ci_ehci_hc_driver;
36 static int (*orig_bus_suspend)(struct usb_hcd *hcd);
37
38 struct ehci_ci_priv {
39 struct regulator *reg_vbus;
40 bool enabled;
41 };
42
ehci_ci_portpower(struct usb_hcd * hcd,int portnum,bool enable)43 static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
44 {
45 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
46 struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv;
47 struct device *dev = hcd->self.controller;
48 struct ci_hdrc *ci = dev_get_drvdata(dev);
49 int ret = 0;
50 int port = HCS_N_PORTS(ehci->hcs_params);
51
52 if (priv->reg_vbus && enable != priv->enabled) {
53 if (port > 1) {
54 dev_warn(dev,
55 "Not support multi-port regulator control\n");
56 return 0;
57 }
58 if (enable)
59 ret = regulator_enable(priv->reg_vbus);
60 else
61 ret = regulator_disable(priv->reg_vbus);
62 if (ret) {
63 dev_err(dev,
64 "Failed to %s vbus regulator, ret=%d\n",
65 enable ? "enable" : "disable", ret);
66 return ret;
67 }
68 priv->enabled = enable;
69 }
70
71 if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) {
72 /*
73 * Marvell 28nm HSIC PHY requires forcing the port to HS mode.
74 * As HSIC is always HS, this should be safe for others.
75 */
76 hw_port_test_set(ci, 5);
77 hw_port_test_set(ci, 0);
78 }
79 return 0;
80 };
81
ehci_ci_reset(struct usb_hcd * hcd)82 static int ehci_ci_reset(struct usb_hcd *hcd)
83 {
84 struct device *dev = hcd->self.controller;
85 struct ci_hdrc *ci = dev_get_drvdata(dev);
86 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
87 int ret;
88
89 ret = ehci_setup(hcd);
90 if (ret)
91 return ret;
92
93 ehci->need_io_watchdog = 0;
94
95 if (ci->platdata->notify_event) {
96 ret = ci->platdata->notify_event(ci,
97 CI_HDRC_CONTROLLER_RESET_EVENT);
98 if (ret)
99 return ret;
100 }
101
102 ci_platform_configure(ci);
103
104 return ret;
105 }
106
107 static const struct ehci_driver_overrides ehci_ci_overrides = {
108 .extra_priv_size = sizeof(struct ehci_ci_priv),
109 .port_power = ehci_ci_portpower,
110 .reset = ehci_ci_reset,
111 };
112
host_irq(struct ci_hdrc * ci)113 static irqreturn_t host_irq(struct ci_hdrc *ci)
114 {
115 return usb_hcd_irq(ci->irq, ci->hcd);
116 }
117
host_start(struct ci_hdrc * ci)118 static int host_start(struct ci_hdrc *ci)
119 {
120 struct usb_hcd *hcd;
121 struct ehci_hcd *ehci;
122 struct ehci_ci_priv *priv;
123 int ret;
124
125 if (usb_disabled())
126 return -ENODEV;
127
128 hcd = __usb_create_hcd(&ci_ehci_hc_driver, ci->dev->parent,
129 ci->dev, dev_name(ci->dev), NULL);
130 if (!hcd)
131 return -ENOMEM;
132
133 dev_set_drvdata(ci->dev, ci);
134 hcd->rsrc_start = ci->hw_bank.phys;
135 hcd->rsrc_len = ci->hw_bank.size;
136 hcd->regs = ci->hw_bank.abs;
137 hcd->has_tt = 1;
138
139 hcd->power_budget = ci->platdata->power_budget;
140 hcd->tpl_support = ci->platdata->tpl_support;
141 if (ci->phy)
142 hcd->phy = ci->phy;
143 else
144 hcd->usb_phy = ci->usb_phy;
145
146 ehci = hcd_to_ehci(hcd);
147 ehci->caps = ci->hw_bank.cap;
148 ehci->has_hostpc = ci->hw_bank.lpm;
149 ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
150 ehci->imx28_write_fix = ci->imx28_write_fix;
151
152 priv = (struct ehci_ci_priv *)ehci->priv;
153 priv->reg_vbus = NULL;
154
155 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
156 if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
157 ret = regulator_enable(ci->platdata->reg_vbus);
158 if (ret) {
159 dev_err(ci->dev,
160 "Failed to enable vbus regulator, ret=%d\n",
161 ret);
162 goto put_hcd;
163 }
164 } else {
165 priv->reg_vbus = ci->platdata->reg_vbus;
166 }
167 }
168
169 ret = usb_add_hcd(hcd, 0, 0);
170 if (ret) {
171 goto disable_reg;
172 } else {
173 struct usb_otg *otg = &ci->otg;
174
175 ci->hcd = hcd;
176
177 if (ci_otg_is_fsm_mode(ci)) {
178 otg->host = &hcd->self;
179 hcd->self.otg_port = 1;
180 }
181 }
182
183 return ret;
184
185 disable_reg:
186 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
187 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
188 regulator_disable(ci->platdata->reg_vbus);
189 put_hcd:
190 usb_put_hcd(hcd);
191
192 return ret;
193 }
194
host_stop(struct ci_hdrc * ci)195 static void host_stop(struct ci_hdrc *ci)
196 {
197 struct usb_hcd *hcd = ci->hcd;
198
199 if (hcd) {
200 if (ci->platdata->notify_event)
201 ci->platdata->notify_event(ci,
202 CI_HDRC_CONTROLLER_STOPPED_EVENT);
203 usb_remove_hcd(hcd);
204 ci->role = CI_ROLE_END;
205 synchronize_irq(ci->irq);
206 usb_put_hcd(hcd);
207 if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
208 (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
209 regulator_disable(ci->platdata->reg_vbus);
210 }
211 ci->hcd = NULL;
212 ci->otg.host = NULL;
213 }
214
215
ci_hdrc_host_destroy(struct ci_hdrc * ci)216 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
217 {
218 if (ci->role == CI_ROLE_HOST && ci->hcd)
219 host_stop(ci);
220 }
221
ci_ehci_bus_suspend(struct usb_hcd * hcd)222 static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
223 {
224 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
225 int port;
226 u32 tmp;
227
228 int ret = orig_bus_suspend(hcd);
229
230 if (ret)
231 return ret;
232
233 port = HCS_N_PORTS(ehci->hcs_params);
234 while (port--) {
235 u32 __iomem *reg = &ehci->regs->port_status[port];
236 u32 portsc = ehci_readl(ehci, reg);
237
238 if (portsc & PORT_CONNECT) {
239 /*
240 * For chipidea, the resume signal will be ended
241 * automatically, so for remote wakeup case, the
242 * usbcmd.rs may not be set before the resume has
243 * ended if other resume paths consumes too much
244 * time (~24ms), in that case, the SOF will not
245 * send out within 3ms after resume ends, then the
246 * high speed device will enter full speed mode.
247 */
248
249 tmp = ehci_readl(ehci, &ehci->regs->command);
250 tmp |= CMD_RUN;
251 ehci_writel(ehci, tmp, &ehci->regs->command);
252 /*
253 * It needs a short delay between set RS bit and PHCD.
254 */
255 usleep_range(150, 200);
256 break;
257 }
258 }
259
260 return 0;
261 }
262
ci_hdrc_host_init(struct ci_hdrc * ci)263 int ci_hdrc_host_init(struct ci_hdrc *ci)
264 {
265 struct ci_role_driver *rdrv;
266
267 if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
268 return -ENXIO;
269
270 rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
271 if (!rdrv)
272 return -ENOMEM;
273
274 rdrv->start = host_start;
275 rdrv->stop = host_stop;
276 rdrv->irq = host_irq;
277 rdrv->name = "host";
278 ci->roles[CI_ROLE_HOST] = rdrv;
279
280 return 0;
281 }
282
ci_hdrc_host_driver_init(void)283 void ci_hdrc_host_driver_init(void)
284 {
285 ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
286 orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
287 ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
288 }
289