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
35static struct hc_driver __read_mostly ci_ehci_hc_driver;
36static int (*orig_bus_suspend)(struct usb_hcd *hcd);
37
38struct ehci_ci_priv {
39	struct regulator *reg_vbus;
40};
41
42static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
43{
44	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
45	struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv;
46	struct device *dev = hcd->self.controller;
47	int ret = 0;
48	int port = HCS_N_PORTS(ehci->hcs_params);
49
50	if (priv->reg_vbus) {
51		if (port > 1) {
52			dev_warn(dev,
53				"Not support multi-port regulator control\n");
54			return 0;
55		}
56		if (enable)
57			ret = regulator_enable(priv->reg_vbus);
58		else
59			ret = regulator_disable(priv->reg_vbus);
60		if (ret) {
61			dev_err(dev,
62				"Failed to %s vbus regulator, ret=%d\n",
63				enable ? "enable" : "disable", ret);
64			return ret;
65		}
66	}
67	return 0;
68};
69
70static const struct ehci_driver_overrides ehci_ci_overrides = {
71	.extra_priv_size = sizeof(struct ehci_ci_priv),
72	.port_power	 = ehci_ci_portpower,
73};
74
75static irqreturn_t host_irq(struct ci_hdrc *ci)
76{
77	return usb_hcd_irq(ci->irq, ci->hcd);
78}
79
80static int host_start(struct ci_hdrc *ci)
81{
82	struct usb_hcd *hcd;
83	struct ehci_hcd *ehci;
84	struct ehci_ci_priv *priv;
85	int ret;
86
87	if (usb_disabled())
88		return -ENODEV;
89
90	hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev));
91	if (!hcd)
92		return -ENOMEM;
93
94	dev_set_drvdata(ci->dev, ci);
95	hcd->rsrc_start = ci->hw_bank.phys;
96	hcd->rsrc_len = ci->hw_bank.size;
97	hcd->regs = ci->hw_bank.abs;
98	hcd->has_tt = 1;
99
100	hcd->power_budget = ci->platdata->power_budget;
101	hcd->tpl_support = ci->platdata->tpl_support;
102	if (ci->phy)
103		hcd->phy = ci->phy;
104	else
105		hcd->usb_phy = ci->usb_phy;
106
107	ehci = hcd_to_ehci(hcd);
108	ehci->caps = ci->hw_bank.cap;
109	ehci->has_hostpc = ci->hw_bank.lpm;
110	ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
111	ehci->imx28_write_fix = ci->imx28_write_fix;
112
113	priv = (struct ehci_ci_priv *)ehci->priv;
114	priv->reg_vbus = NULL;
115
116	if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
117		if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
118			ret = regulator_enable(ci->platdata->reg_vbus);
119			if (ret) {
120				dev_err(ci->dev,
121				"Failed to enable vbus regulator, ret=%d\n",
122									ret);
123				goto put_hcd;
124			}
125		} else {
126			priv->reg_vbus = ci->platdata->reg_vbus;
127		}
128	}
129
130	ret = usb_add_hcd(hcd, 0, 0);
131	if (ret) {
132		goto disable_reg;
133	} else {
134		struct usb_otg *otg = &ci->otg;
135
136		ci->hcd = hcd;
137
138		if (ci_otg_is_fsm_mode(ci)) {
139			otg->host = &hcd->self;
140			hcd->self.otg_port = 1;
141		}
142	}
143
144	if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING)
145		hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
146
147	if (ci->platdata->flags & CI_HDRC_FORCE_FULLSPEED)
148		hw_write(ci, OP_PORTSC, PORTSC_PFSC, PORTSC_PFSC);
149
150	return ret;
151
152disable_reg:
153	if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
154			(ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
155		regulator_disable(ci->platdata->reg_vbus);
156put_hcd:
157	usb_put_hcd(hcd);
158
159	return ret;
160}
161
162static void host_stop(struct ci_hdrc *ci)
163{
164	struct usb_hcd *hcd = ci->hcd;
165
166	if (hcd) {
167		usb_remove_hcd(hcd);
168		usb_put_hcd(hcd);
169		if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
170			(ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
171				regulator_disable(ci->platdata->reg_vbus);
172	}
173}
174
175
176void ci_hdrc_host_destroy(struct ci_hdrc *ci)
177{
178	if (ci->role == CI_ROLE_HOST && ci->hcd)
179		host_stop(ci);
180}
181
182static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
183{
184	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
185	int port;
186	u32 tmp;
187
188	int ret = orig_bus_suspend(hcd);
189
190	if (ret)
191		return ret;
192
193	port = HCS_N_PORTS(ehci->hcs_params);
194	while (port--) {
195		u32 __iomem *reg = &ehci->regs->port_status[port];
196		u32 portsc = ehci_readl(ehci, reg);
197
198		if (portsc & PORT_CONNECT) {
199			/*
200			 * For chipidea, the resume signal will be ended
201			 * automatically, so for remote wakeup case, the
202			 * usbcmd.rs may not be set before the resume has
203			 * ended if other resume paths consumes too much
204			 * time (~24ms), in that case, the SOF will not
205			 * send out within 3ms after resume ends, then the
206			 * high speed device will enter full speed mode.
207			 */
208
209			tmp = ehci_readl(ehci, &ehci->regs->command);
210			tmp |= CMD_RUN;
211			ehci_writel(ehci, tmp, &ehci->regs->command);
212			/*
213			 * It needs a short delay between set RS bit and PHCD.
214			 */
215			usleep_range(150, 200);
216			break;
217		}
218	}
219
220	return 0;
221}
222
223int ci_hdrc_host_init(struct ci_hdrc *ci)
224{
225	struct ci_role_driver *rdrv;
226
227	if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
228		return -ENXIO;
229
230	rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
231	if (!rdrv)
232		return -ENOMEM;
233
234	rdrv->start	= host_start;
235	rdrv->stop	= host_stop;
236	rdrv->irq	= host_irq;
237	rdrv->name	= "host";
238	ci->roles[CI_ROLE_HOST] = rdrv;
239
240	return 0;
241}
242
243void ci_hdrc_host_driver_init(void)
244{
245	ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
246	orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
247	ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
248}
249