2 * ohci-omap3.c - driver for OHCI on OMAP3 and later processors
4 * Bus Glue for OMAP3 USBHOST 3 port OHCI controller
5 * This controller is also used in later OMAPs and AM35x chips
7 * Copyright (C) 2007-2010 Texas Instruments, Inc.
8 * Author: Vikram Pandita <vikram.pandita@ti.com>
9 * Author: Anand Gadiyar <gadiyar@ti.com>
10 * Author: Keshava Munegowda <keshava_mgowda@ti.com>
12 * Based on ehci-omap.c and some other ohci glue layers
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 * TODO (last updated Feb 27, 2011):
32 #include <linux/dma-mapping.h>
33 #include <linux/kernel.h>
34 #include <linux/module.h>
36 #include <linux/usb/otg.h>
37 #include <linux/platform_device.h>
38 #include <linux/pm_runtime.h>
39 #include <linux/usb.h>
40 #include <linux/usb/hcd.h>
44 #define DRIVER_DESC "OHCI OMAP3 driver"
46 static const char hcd_name[] = "ohci-omap3";
47 static struct hc_driver __read_mostly ohci_omap3_hc_driver;
50 * configure so an HC device and id are always provided
51 * always called with process context; sleeping is OK
55 * ohci_hcd_omap3_probe - initialize OMAP-based HCDs
57 * Allocates basic resources for this USB host controller, and
58 * then invokes the start() method for the HCD associated with it
59 * through the hotplug entry's driver_data.
61 static int ohci_hcd_omap3_probe(struct platform_device *pdev)
63 struct device *dev = &pdev->dev;
64 struct ohci_hcd *ohci;
65 struct usb_hcd *hcd = NULL;
66 void __iomem *regs = NULL;
75 dev_err(dev, "Missing parent device\n");
79 irq = platform_get_irq(pdev, 0);
81 dev_err(dev, "OHCI irq failed\n");
85 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
87 dev_err(dev, "UHH OHCI get resource failed\n");
91 regs = ioremap(res->start, resource_size(res));
93 dev_err(dev, "UHH OHCI ioremap failed\n");
98 * Right now device-tree probed devices don't get dma_mask set.
99 * Since shared usb code relies on it, set it here for now.
100 * Once we have dma capability bindings this can go away.
102 ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
107 hcd = usb_create_hcd(&ohci_omap3_hc_driver, dev,
110 dev_err(dev, "usb_create_hcd failed\n");
114 hcd->rsrc_start = res->start;
115 hcd->rsrc_len = resource_size(res);
118 pm_runtime_enable(dev);
119 pm_runtime_get_sync(dev);
121 ohci = hcd_to_ohci(hcd);
123 * RemoteWakeupConnected has to be set explicitly before
124 * calling ohci_run. The reset value of RWC is 0.
126 ohci->hc_control = OHCI_CTRL_RWC;
128 ret = usb_add_hcd(hcd, irq, 0);
130 dev_dbg(dev, "failed to add hcd with err %d\n", ret);
133 device_wakeup_enable(hcd->self.controller);
138 pm_runtime_put_sync(dev);
148 * may be called without controller electrically present
149 * may be called with controller, bus, and devices active
153 * ohci_hcd_omap3_remove - shutdown processing for OHCI HCDs
154 * @pdev: USB Host Controller being removed
156 * Reverses the effect of ohci_hcd_omap3_probe(), first invoking
157 * the HCD's stop() method. It is always called from a thread
158 * context, normally "rmmod", "apmd", or something similar.
160 static int ohci_hcd_omap3_remove(struct platform_device *pdev)
162 struct device *dev = &pdev->dev;
163 struct usb_hcd *hcd = dev_get_drvdata(dev);
167 pm_runtime_put_sync(dev);
168 pm_runtime_disable(dev);
173 static const struct of_device_id omap_ohci_dt_ids[] = {
174 { .compatible = "ti,ohci-omap3" },
178 MODULE_DEVICE_TABLE(of, omap_ohci_dt_ids);
180 static struct platform_driver ohci_hcd_omap3_driver = {
181 .probe = ohci_hcd_omap3_probe,
182 .remove = ohci_hcd_omap3_remove,
183 .shutdown = usb_hcd_platform_shutdown,
185 .name = "ohci-omap3",
186 .of_match_table = omap_ohci_dt_ids,
190 static int __init ohci_omap3_init(void)
195 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
197 ohci_init_driver(&ohci_omap3_hc_driver, NULL);
198 return platform_driver_register(&ohci_hcd_omap3_driver);
200 module_init(ohci_omap3_init);
202 static void __exit ohci_omap3_cleanup(void)
204 platform_driver_unregister(&ohci_hcd_omap3_driver);
206 module_exit(ohci_omap3_cleanup);
208 MODULE_DESCRIPTION(DRIVER_DESC);
209 MODULE_ALIAS("platform:ohci-omap3");
210 MODULE_AUTHOR("Anand Gadiyar <gadiyar@ti.com>");
211 MODULE_LICENSE("GPL");