Version:  2.0.40 2.2.26 2.4.37 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6

Linux/drivers/usb/host/ehci-msm.c

  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 
 44 static const char hcd_name[] = "ehci-msm";
 45 static struct hc_driver __read_mostly msm_hc_driver;
 46 
 47 static 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 
 73 static 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 
154 put_hcd:
155         usb_put_hcd(hcd);
156 
157         return ret;
158 }
159 
160 static 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
179 static int ehci_msm_pm_suspend(struct device *dev)
180 {
181         struct usb_hcd *hcd = dev_get_drvdata(dev);
182         bool do_wakeup = device_may_wakeup(dev);
183 
184         dev_dbg(dev, "ehci-msm PM suspend\n");
185 
186         return ehci_suspend(hcd, do_wakeup);
187 }
188 
189 static int ehci_msm_pm_resume(struct device *dev)
190 {
191         struct usb_hcd *hcd = dev_get_drvdata(dev);
192 
193         dev_dbg(dev, "ehci-msm PM resume\n");
194         ehci_resume(hcd, false);
195 
196         return 0;
197 }
198 #else
199 #define ehci_msm_pm_suspend     NULL
200 #define ehci_msm_pm_resume      NULL
201 #endif
202 
203 static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
204         .suspend         = ehci_msm_pm_suspend,
205         .resume          = ehci_msm_pm_resume,
206 };
207 
208 static const struct acpi_device_id msm_ehci_acpi_ids[] = {
209         { "QCOM8040", 0 },
210         { }
211 };
212 MODULE_DEVICE_TABLE(acpi, msm_ehci_acpi_ids);
213 
214 static const struct of_device_id msm_ehci_dt_match[] = {
215         { .compatible = "qcom,ehci-host", },
216         {}
217 };
218 MODULE_DEVICE_TABLE(of, msm_ehci_dt_match);
219 
220 static struct platform_driver ehci_msm_driver = {
221         .probe  = ehci_msm_probe,
222         .remove = ehci_msm_remove,
223         .shutdown = usb_hcd_platform_shutdown,
224         .driver = {
225                    .name = "msm_hsusb_host",
226                    .pm = &ehci_msm_dev_pm_ops,
227                    .of_match_table = msm_ehci_dt_match,
228                    .acpi_match_table = ACPI_PTR(msm_ehci_acpi_ids),
229         },
230 };
231 
232 static const struct ehci_driver_overrides msm_overrides __initdata = {
233         .reset = ehci_msm_reset,
234 };
235 
236 static int __init ehci_msm_init(void)
237 {
238         if (usb_disabled())
239                 return -ENODEV;
240 
241         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
242         ehci_init_driver(&msm_hc_driver, &msm_overrides);
243         return platform_driver_register(&ehci_msm_driver);
244 }
245 module_init(ehci_msm_init);
246 
247 static void __exit ehci_msm_cleanup(void)
248 {
249         platform_driver_unregister(&ehci_msm_driver);
250 }
251 module_exit(ehci_msm_cleanup);
252 
253 MODULE_DESCRIPTION(DRIVER_DESC);
254 MODULE_ALIAS("platform:msm-ehci");
255 MODULE_LICENSE("GPL");
256 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us