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
35 static struct usb_phy *phy;
36
ehci_msm_reset(struct usb_hcd * hcd)37 static 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
60 static 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
ehci_msm_probe(struct platform_device * pdev)106 static 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 phy = usb_get_transceiver();
149 if (!phy) {
150 dev_err(&pdev->dev, "unable to find transceiver\n");
151 ret = -ENODEV;
152 goto unmap;
153 }
154
155 ret = otg_set_host(phy->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
171 put_transceiver:
172 usb_put_transceiver(phy);
173 unmap:
174 iounmap(hcd->regs);
175 put_hcd:
176 usb_put_hcd(hcd);
177
178 return ret;
179 }
180
ehci_msm_remove(struct platform_device * pdev)181 static 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(phy->otg, NULL);
190 usb_put_transceiver(phy);
191
192 usb_put_hcd(hcd);
193
194 return 0;
195 }
196
197 #ifdef CONFIG_PM
ehci_msm_pm_suspend(struct device * dev)198 static 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
ehci_msm_pm_resume(struct device * dev)221 static 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
235 static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
236 .suspend = ehci_msm_pm_suspend,
237 .resume = ehci_msm_pm_resume,
238 };
239
240 static 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