tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/clk.h>
26#include <linux/err.h>
27#include <linux/io.h>
28#include <linux/kernel.h>
29#include <linux/module.h>
30#include <linux/platform_device.h>
31#include <linux/pm_runtime.h>
32#include <linux/usb/otg.h>
33#include <linux/usb/msm_hsusb_hw.h>
34#include <linux/usb.h>
35#include <linux/usb/hcd.h>
36#include <linux/acpi.h>
37
38#include "ehci.h"
39
40#define MSM_USB_BASE (hcd->regs)
41
42#define DRIVER_DESC "Qualcomm On-Chip EHCI Host Controller"
43
44static const char hcd_name[] = "ehci-msm";
45static struct hc_driver __read_mostly msm_hc_driver;
46
47static int ehci_msm_reset(struct usb_hcd *hcd)
48{
49 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
50 int retval;
51
52 ehci->caps = USB_CAPLENGTH;
53 hcd->has_tt = 1;
54
55 retval = ehci_setup(hcd);
56 if (retval)
57 return retval;
58
59 /* select ULPI phy and clear other status/control bits in PORTSC */
60 writel(PORTSC_PTS_ULPI, USB_PORTSC);
61 /* bursts of unspecified length. */
62 writel(0, USB_AHBBURST);
63 /* Use the AHB transactor, allow posted data writes */
64 writel(0x8, USB_AHBMODE);
65 /* Disable streaming mode and select host mode */
66 writel(0x13, USB_USBMODE);
67 /* Disable ULPI_TX_PKT_EN_CLR_FIX which is valid only for HSIC */
68 writel(readl(USB_GENCONFIG_2) & ~ULPI_TX_PKT_EN_CLR_FIX, USB_GENCONFIG_2);
69
70 return 0;
71}
72
73static int ehci_msm_probe(struct platform_device *pdev)
74{
75 struct usb_hcd *hcd;
76 struct resource *res;
77 struct usb_phy *phy;
78 int ret;
79
80 dev_dbg(&pdev->dev, "ehci_msm proble\n");
81
82 hcd = usb_create_hcd(&msm_hc_driver, &pdev->dev, dev_name(&pdev->dev));
83 if (!hcd) {
84 dev_err(&pdev->dev, "Unable to create HCD\n");
85 return -ENOMEM;
86 }
87
88 ret = platform_get_irq(pdev, 0);
89 if (ret < 0) {
90 dev_err(&pdev->dev, "Unable to get IRQ resource\n");
91 goto put_hcd;
92 }
93 hcd->irq = ret;
94
95 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
96 if (!res) {
97 dev_err(&pdev->dev, "Unable to get memory resource\n");
98 ret = -ENODEV;
99 goto put_hcd;
100 }
101
102 hcd->rsrc_start = res->start;
103 hcd->rsrc_len = resource_size(res);
104 hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
105 if (!hcd->regs) {
106 dev_err(&pdev->dev, "ioremap failed\n");
107 ret = -ENOMEM;
108 goto put_hcd;
109 }
110
111 /*
112 * If there is an OTG driver, let it take care of PHY initialization,
113 * clock management, powering up VBUS, mapping of registers address
114 * space and power management.
115 */
116 if (pdev->dev.of_node)
117 phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
118 else
119 phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
120
121 if (IS_ERR(phy)) {
122 if (PTR_ERR(phy) == -EPROBE_DEFER) {
123 dev_err(&pdev->dev, "unable to find transceiver\n");
124 ret = -EPROBE_DEFER;
125 goto put_hcd;
126 }
127 phy = NULL;
128 }
129
130 hcd->usb_phy = phy;
131 device_init_wakeup(&pdev->dev, 1);
132
133 if (phy && phy->otg) {
134 /*
135 * MSM OTG driver takes care of adding the HCD and
136 * placing hardware into low power mode via runtime PM.
137 */
138 ret = otg_set_host(phy->otg, &hcd->self);
139 if (ret < 0) {
140 dev_err(&pdev->dev, "unable to register with transceiver\n");
141 goto put_hcd;
142 }
143
144 pm_runtime_no_callbacks(&pdev->dev);
145 pm_runtime_enable(&pdev->dev);
146 } else {
147 ret = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
148 if (ret)
149 goto put_hcd;
150 }
151
152 return 0;
153
154put_hcd:
155 usb_put_hcd(hcd);
156
157 return ret;
158}
159
160static int ehci_msm_remove(struct platform_device *pdev)
161{
162 struct usb_hcd *hcd = platform_get_drvdata(pdev);
163
164 device_init_wakeup(&pdev->dev, 0);
165 pm_runtime_disable(&pdev->dev);
166 pm_runtime_set_suspended(&pdev->dev);
167
168 if (hcd->usb_phy && hcd->usb_phy->otg)
169 otg_set_host(hcd->usb_phy->otg, NULL);
170 else
171 usb_remove_hcd(hcd);
172
173 usb_put_hcd(hcd);
174
175 return 0;
176}
177
178#ifdef CONFIG_PM
179static int ehci_msm_pm_suspend(struct device *dev)
180{
181 struct usb_hcd *hcd = dev_get_drvdata(dev);
182 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
183 bool do_wakeup = device_may_wakeup(dev);
184
185 dev_dbg(dev, "ehci-msm PM suspend\n");
186
187 /* Only call ehci_suspend if ehci_setup has been done */
188 if (ehci->sbrn)
189 return ehci_suspend(hcd, do_wakeup);
190
191 return 0;
192}
193
194static int ehci_msm_pm_resume(struct device *dev)
195{
196 struct usb_hcd *hcd = dev_get_drvdata(dev);
197 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
198
199 dev_dbg(dev, "ehci-msm PM resume\n");
200
201 /* Only call ehci_resume if ehci_setup has been done */
202 if (ehci->sbrn)
203 ehci_resume(hcd, false);
204
205 return 0;
206}
207
208#else
209#define ehci_msm_pm_suspend NULL
210#define ehci_msm_pm_resume NULL
211#endif
212
213static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
214 .suspend = ehci_msm_pm_suspend,
215 .resume = ehci_msm_pm_resume,
216};
217
218static const struct acpi_device_id msm_ehci_acpi_ids[] = {
219 { "QCOM8040", 0 },
220 { }
221};
222MODULE_DEVICE_TABLE(acpi, msm_ehci_acpi_ids);
223
224static const struct of_device_id msm_ehci_dt_match[] = {
225 { .compatible = "qcom,ehci-host", },
226 {}
227};
228MODULE_DEVICE_TABLE(of, msm_ehci_dt_match);
229
230static struct platform_driver ehci_msm_driver = {
231 .probe = ehci_msm_probe,
232 .remove = ehci_msm_remove,
233 .shutdown = usb_hcd_platform_shutdown,
234 .driver = {
235 .name = "msm_hsusb_host",
236 .pm = &ehci_msm_dev_pm_ops,
237 .of_match_table = msm_ehci_dt_match,
238 .acpi_match_table = ACPI_PTR(msm_ehci_acpi_ids),
239 },
240};
241
242static const struct ehci_driver_overrides msm_overrides __initconst = {
243 .reset = ehci_msm_reset,
244};
245
246static int __init ehci_msm_init(void)
247{
248 if (usb_disabled())
249 return -ENODEV;
250
251 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
252 ehci_init_driver(&msm_hc_driver, &msm_overrides);
253 return platform_driver_register(&ehci_msm_driver);
254}
255module_init(ehci_msm_init);
256
257static void __exit ehci_msm_cleanup(void)
258{
259 platform_driver_unregister(&ehci_msm_driver);
260}
261module_exit(ehci_msm_cleanup);
262
263MODULE_DESCRIPTION(DRIVER_DESC);
264MODULE_ALIAS("platform:msm-ehci");
265MODULE_LICENSE("GPL");