1/* ehci-msm.c - HSUSB Host Controller Driver Implementation
2 *
3 * Copyright (c) 2008-2011, Code Aurora Forum. All rights reserved.
4 *
5 * Partly derived from ehci-fsl.c and ehci-hcd.c
6 * Copyright (c) 2000-2004 by David Brownell
7 * Copyright (c) 2005 MontaVista Software
8 *
9 * All source code in this file is licensed under the following license except
10 * where indicated.
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License version 2 as published
14 * by the Free Software Foundation.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
19 *
20 * See the GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, you can find it at http://www.fsf.org
23 */
24
25#include <linux/platform_device.h>
26#include <linux/clk.h>
27#include <linux/err.h>
28#include <linux/pm_runtime.h>
29
30#include <linux/usb/otg.h>
31#include <linux/usb/msm_hsusb_hw.h>
32
33#define MSM_USB_BASE (hcd->regs)
34
35static struct otg_transceiver *otg;
36
37static int ehci_msm_reset(struct usb_hcd *hcd)
38{
39	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
40	int retval;
41
42	ehci->caps = USB_CAPLENGTH;
43	hcd->has_tt = 1;
44
45	retval = ehci_setup(hcd);
46	if (retval)
47		return retval;
48
49	/* bursts of unspecified length. */
50	writel(0, USB_AHBBURST);
51	/* Use the AHB transactor */
52	writel(0, USB_AHBMODE);
53	/* Disable streaming mode and select host mode */
54	writel(0x13, USB_USBMODE);
55
56	ehci_port_power(ehci, 1);
57	return 0;
58}
59
60static struct hc_driver msm_hc_driver = {
61	.description		= hcd_name,
62	.product_desc		= "Qualcomm On-Chip EHCI Host Controller",
63	.hcd_priv_size		= sizeof(struct ehci_hcd),
64
65	/*
66	 * generic hardware linkage
67	 */
68	.irq			= ehci_irq,
69	.flags			= HCD_USB2 | HCD_MEMORY,
70
71	.reset			= ehci_msm_reset,
72	.start			= ehci_run,
73
74	.stop			= ehci_stop,
75	.shutdown		= ehci_shutdown,
76
77	/*
78	 * managing i/o requests and associated device resources
79	 */
80	.urb_enqueue		= ehci_urb_enqueue,
81	.urb_dequeue		= ehci_urb_dequeue,
82	.endpoint_disable	= ehci_endpoint_disable,
83	.endpoint_reset		= ehci_endpoint_reset,
84	.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
85
86	/*
87	 * scheduling support
88	 */
89	.get_frame_number	= ehci_get_frame,
90
91	/*
92	 * root hub support
93	 */
94	.hub_status_data	= ehci_hub_status_data,
95	.hub_control		= ehci_hub_control,
96	.relinquish_port	= ehci_relinquish_port,
97	.port_handed_over	= ehci_port_handed_over,
98
99	/*
100	 * PM support
101	 */
102	.bus_suspend		= ehci_bus_suspend,
103	.bus_resume		= ehci_bus_resume,
104};
105
106static int ehci_msm_probe(struct platform_device *pdev)
107{
108	struct usb_hcd *hcd;
109	struct resource *res;
110	int ret;
111
112	dev_dbg(&pdev->dev, "ehci_msm proble\n");
113
114	hcd = usb_create_hcd(&msm_hc_driver, &pdev->dev, dev_name(&pdev->dev));
115	if (!hcd) {
116		dev_err(&pdev->dev, "Unable to create HCD\n");
117		return  -ENOMEM;
118	}
119
120	hcd->irq = platform_get_irq(pdev, 0);
121	if (hcd->irq < 0) {
122		dev_err(&pdev->dev, "Unable to get IRQ resource\n");
123		ret = hcd->irq;
124		goto put_hcd;
125	}
126
127	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
128	if (!res) {
129		dev_err(&pdev->dev, "Unable to get memory resource\n");
130		ret = -ENODEV;
131		goto put_hcd;
132	}
133
134	hcd->rsrc_start = res->start;
135	hcd->rsrc_len = resource_size(res);
136	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
137	if (!hcd->regs) {
138		dev_err(&pdev->dev, "ioremap failed\n");
139		ret = -ENOMEM;
140		goto put_hcd;
141	}
142
143	/*
144	 * OTG driver takes care of PHY initialization, clock management,
145	 * powering up VBUS, mapping of registers address space and power
146	 * management.
147	 */
148	otg = otg_get_transceiver();
149	if (!otg) {
150		dev_err(&pdev->dev, "unable to find transceiver\n");
151		ret = -ENODEV;
152		goto unmap;
153	}
154
155	ret = otg_set_host(otg, &hcd->self);
156	if (ret < 0) {
157		dev_err(&pdev->dev, "unable to register with transceiver\n");
158		goto put_transceiver;
159	}
160
161	device_init_wakeup(&pdev->dev, 1);
162	/*
163	 * OTG device parent of HCD takes care of putting
164	 * hardware into low power mode.
165	 */
166	pm_runtime_no_callbacks(&pdev->dev);
167	pm_runtime_enable(&pdev->dev);
168
169	return 0;
170
171put_transceiver:
172	otg_put_transceiver(otg);
173unmap:
174	iounmap(hcd->regs);
175put_hcd:
176	usb_put_hcd(hcd);
177
178	return ret;
179}
180
181static int __devexit ehci_msm_remove(struct platform_device *pdev)
182{
183	struct usb_hcd *hcd = platform_get_drvdata(pdev);
184
185	device_init_wakeup(&pdev->dev, 0);
186	pm_runtime_disable(&pdev->dev);
187	pm_runtime_set_suspended(&pdev->dev);
188
189	otg_set_host(otg, NULL);
190	otg_put_transceiver(otg);
191
192	usb_put_hcd(hcd);
193
194	return 0;
195}
196
197#ifdef CONFIG_PM
198static int ehci_msm_pm_suspend(struct device *dev)
199{
200	struct usb_hcd *hcd = dev_get_drvdata(dev);
201	bool wakeup = device_may_wakeup(dev);
202
203	dev_dbg(dev, "ehci-msm PM suspend\n");
204
205	/*
206	 * EHCI helper function has also the same check before manipulating
207	 * port wakeup flags.  We do check here the same condition before
208	 * calling the same helper function to avoid bringing hardware
209	 * from Low power mode when there is no need for adjusting port
210	 * wakeup flags.
211	 */
212	if (hcd->self.root_hub->do_remote_wakeup && !wakeup) {
213		pm_runtime_resume(dev);
214		ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd),
215				wakeup);
216	}
217
218	return 0;
219}
220
221static int ehci_msm_pm_resume(struct device *dev)
222{
223	struct usb_hcd *hcd = dev_get_drvdata(dev);
224
225	dev_dbg(dev, "ehci-msm PM resume\n");
226	ehci_prepare_ports_for_controller_resume(hcd_to_ehci(hcd));
227
228	return 0;
229}
230#else
231#define ehci_msm_pm_suspend	NULL
232#define ehci_msm_pm_resume	NULL
233#endif
234
235static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
236	.suspend         = ehci_msm_pm_suspend,
237	.resume          = ehci_msm_pm_resume,
238};
239
240static struct platform_driver ehci_msm_driver = {
241	.probe	= ehci_msm_probe,
242	.remove	= __devexit_p(ehci_msm_remove),
243	.driver = {
244		   .name = "msm_hsusb_host",
245		   .pm = &ehci_msm_dev_pm_ops,
246	},
247};
248