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Linux/drivers/usb/host/ohci-omap3.c

  1 /*
  2  * ohci-omap3.c - driver for OHCI on OMAP3 and later processors
  3  *
  4  * Bus Glue for OMAP3 USBHOST 3 port OHCI controller
  5  * This controller is also used in later OMAPs and AM35x chips
  6  *
  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>
 11  *
 12  * Based on ehci-omap.c and some other ohci glue layers
 13  *
 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.
 18  *
 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.
 23  *
 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
 27  *
 28  * TODO (last updated Feb 27, 2011):
 29  *      - add kernel-doc
 30  */
 31 
 32 #include <linux/dma-mapping.h>
 33 #include <linux/kernel.h>
 34 #include <linux/module.h>
 35 #include <linux/of.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>
 41 
 42 #include "ohci.h"
 43 
 44 #define DRIVER_DESC "OHCI OMAP3 driver"
 45 
 46 static const char hcd_name[] = "ohci-omap3";
 47 static struct hc_driver __read_mostly ohci_omap3_hc_driver;
 48 
 49 /*
 50  * configure so an HC device and id are always provided
 51  * always called with process context; sleeping is OK
 52  */
 53 
 54 /**
 55  * ohci_hcd_omap3_probe - initialize OMAP-based HCDs
 56  *
 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.
 60  */
 61 static int ohci_hcd_omap3_probe(struct platform_device *pdev)
 62 {
 63         struct device           *dev = &pdev->dev;
 64         struct ohci_hcd         *ohci;
 65         struct usb_hcd          *hcd = NULL;
 66         void __iomem            *regs = NULL;
 67         struct resource         *res;
 68         int                     ret;
 69         int                     irq;
 70 
 71         if (usb_disabled())
 72                 return -ENODEV;
 73 
 74         if (!dev->parent) {
 75                 dev_err(dev, "Missing parent device\n");
 76                 return -ENODEV;
 77         }
 78 
 79         irq = platform_get_irq(pdev, 0);
 80         if (irq < 0) {
 81                 dev_err(dev, "OHCI irq failed\n");
 82                 return -ENODEV;
 83         }
 84 
 85         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 86         if (!res) {
 87                 dev_err(dev, "UHH OHCI get resource failed\n");
 88                 return -ENOMEM;
 89         }
 90 
 91         regs = ioremap(res->start, resource_size(res));
 92         if (!regs) {
 93                 dev_err(dev, "UHH OHCI ioremap failed\n");
 94                 return -ENOMEM;
 95         }
 96 
 97         /*
 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.
101          */
102         ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
103         if (ret)
104                 goto err_io;
105 
106         ret = -ENODEV;
107         hcd = usb_create_hcd(&ohci_omap3_hc_driver, dev,
108                         dev_name(dev));
109         if (!hcd) {
110                 dev_err(dev, "usb_create_hcd failed\n");
111                 goto err_io;
112         }
113 
114         hcd->rsrc_start = res->start;
115         hcd->rsrc_len = resource_size(res);
116         hcd->regs =  regs;
117 
118         pm_runtime_enable(dev);
119         pm_runtime_get_sync(dev);
120 
121         ohci = hcd_to_ohci(hcd);
122         /*
123          * RemoteWakeupConnected has to be set explicitly before
124          * calling ohci_run. The reset value of RWC is 0.
125          */
126         ohci->hc_control = OHCI_CTRL_RWC;
127 
128         ret = usb_add_hcd(hcd, irq, 0);
129         if (ret) {
130                 dev_dbg(dev, "failed to add hcd with err %d\n", ret);
131                 goto err_add_hcd;
132         }
133         device_wakeup_enable(hcd->self.controller);
134 
135         return 0;
136 
137 err_add_hcd:
138         pm_runtime_put_sync(dev);
139         usb_put_hcd(hcd);
140 
141 err_io:
142         iounmap(regs);
143 
144         return ret;
145 }
146 
147 /*
148  * may be called without controller electrically present
149  * may be called with controller, bus, and devices active
150  */
151 
152 /**
153  * ohci_hcd_omap3_remove - shutdown processing for OHCI HCDs
154  * @pdev: USB Host Controller being removed
155  *
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.
159  */
160 static int ohci_hcd_omap3_remove(struct platform_device *pdev)
161 {
162         struct device *dev      = &pdev->dev;
163         struct usb_hcd *hcd     = dev_get_drvdata(dev);
164 
165         iounmap(hcd->regs);
166         usb_remove_hcd(hcd);
167         pm_runtime_put_sync(dev);
168         pm_runtime_disable(dev);
169         usb_put_hcd(hcd);
170         return 0;
171 }
172 
173 static const struct of_device_id omap_ohci_dt_ids[] = {
174         { .compatible = "ti,ohci-omap3" },
175         { }
176 };
177 
178 MODULE_DEVICE_TABLE(of, omap_ohci_dt_ids);
179 
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,
184         .driver         = {
185                 .name   = "ohci-omap3",
186                 .of_match_table = omap_ohci_dt_ids,
187         },
188 };
189 
190 static int __init ohci_omap3_init(void)
191 {
192         if (usb_disabled())
193                 return -ENODEV;
194 
195         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
196 
197         ohci_init_driver(&ohci_omap3_hc_driver, NULL);
198         return platform_driver_register(&ohci_hcd_omap3_driver);
199 }
200 module_init(ohci_omap3_init);
201 
202 static void __exit ohci_omap3_cleanup(void)
203 {
204         platform_driver_unregister(&ohci_hcd_omap3_driver);
205 }
206 module_exit(ohci_omap3_cleanup);
207 
208 MODULE_DESCRIPTION(DRIVER_DESC);
209 MODULE_ALIAS("platform:ohci-omap3");
210 MODULE_AUTHOR("Anand Gadiyar <gadiyar@ti.com>");
211 MODULE_LICENSE("GPL");
212 

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