212 lines
5.3 KiB
C
212 lines
5.3 KiB
C
/*
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* ohci-omap3.c - driver for OHCI on OMAP3 and later processors
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*
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* Bus Glue for OMAP3 USBHOST 3 port OHCI controller
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* This controller is also used in later OMAPs and AM35x chips
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*
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* Copyright (C) 2007-2010 Texas Instruments, Inc.
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* Author: Vikram Pandita <vikram.pandita@ti.com>
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* Author: Anand Gadiyar <gadiyar@ti.com>
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* Author: Keshava Munegowda <keshava_mgowda@ti.com>
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*
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* Based on ehci-omap.c and some other ohci glue layers
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* TODO (last updated Feb 27, 2011):
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* - add kernel-doc
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*/
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#include <linux/dma-mapping.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/usb/otg.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include "ohci.h"
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#define DRIVER_DESC "OHCI OMAP3 driver"
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static const char hcd_name[] = "ohci-omap3";
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static struct hc_driver __read_mostly ohci_omap3_hc_driver;
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/*
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* configure so an HC device and id are always provided
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* always called with process context; sleeping is OK
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*/
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/**
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* ohci_hcd_omap3_probe - initialize OMAP-based HCDs
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*
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* Allocates basic resources for this USB host controller, and
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* then invokes the start() method for the HCD associated with it
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* through the hotplug entry's driver_data.
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*/
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static int ohci_hcd_omap3_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ohci_hcd *ohci;
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struct usb_hcd *hcd = NULL;
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void __iomem *regs = NULL;
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struct resource *res;
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int ret;
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int irq;
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if (usb_disabled())
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return -ENODEV;
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if (!dev->parent) {
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dev_err(dev, "Missing parent device\n");
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return -ENODEV;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(dev, "OHCI irq failed\n");
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return -ENODEV;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(dev, "UHH OHCI get resource failed\n");
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return -ENOMEM;
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}
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regs = ioremap(res->start, resource_size(res));
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if (!regs) {
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dev_err(dev, "UHH OHCI ioremap failed\n");
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return -ENOMEM;
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}
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/*
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* Right now device-tree probed devices don't get dma_mask set.
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* Since shared usb code relies on it, set it here for now.
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* Once we have dma capability bindings this can go away.
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*/
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ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
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if (ret)
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goto err_io;
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ret = -ENODEV;
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hcd = usb_create_hcd(&ohci_omap3_hc_driver, dev,
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dev_name(dev));
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if (!hcd) {
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dev_err(dev, "usb_create_hcd failed\n");
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goto err_io;
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}
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = resource_size(res);
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hcd->regs = regs;
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pm_runtime_enable(dev);
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pm_runtime_get_sync(dev);
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ohci = hcd_to_ohci(hcd);
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/*
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* RemoteWakeupConnected has to be set explicitly before
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* calling ohci_run. The reset value of RWC is 0.
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*/
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ohci->hc_control = OHCI_CTRL_RWC;
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ret = usb_add_hcd(hcd, irq, 0);
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if (ret) {
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dev_dbg(dev, "failed to add hcd with err %d\n", ret);
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goto err_add_hcd;
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}
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device_wakeup_enable(hcd->self.controller);
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return 0;
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err_add_hcd:
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pm_runtime_put_sync(dev);
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usb_put_hcd(hcd);
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err_io:
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iounmap(regs);
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return ret;
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}
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/*
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* may be called without controller electrically present
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* may be called with controller, bus, and devices active
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*/
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/**
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* ohci_hcd_omap3_remove - shutdown processing for OHCI HCDs
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* @pdev: USB Host Controller being removed
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*
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* Reverses the effect of ohci_hcd_omap3_probe(), first invoking
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* the HCD's stop() method. It is always called from a thread
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* context, normally "rmmod", "apmd", or something similar.
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*/
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static int ohci_hcd_omap3_remove(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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iounmap(hcd->regs);
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usb_remove_hcd(hcd);
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pm_runtime_put_sync(dev);
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pm_runtime_disable(dev);
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usb_put_hcd(hcd);
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return 0;
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}
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static const struct of_device_id omap_ohci_dt_ids[] = {
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{ .compatible = "ti,ohci-omap3" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, omap_ohci_dt_ids);
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static struct platform_driver ohci_hcd_omap3_driver = {
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.probe = ohci_hcd_omap3_probe,
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.remove = ohci_hcd_omap3_remove,
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.shutdown = usb_hcd_platform_shutdown,
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.driver = {
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.name = "ohci-omap3",
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.of_match_table = omap_ohci_dt_ids,
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},
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};
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static int __init ohci_omap3_init(void)
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{
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if (usb_disabled())
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return -ENODEV;
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pr_info("%s: " DRIVER_DESC "\n", hcd_name);
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ohci_init_driver(&ohci_omap3_hc_driver, NULL);
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return platform_driver_register(&ohci_hcd_omap3_driver);
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}
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module_init(ohci_omap3_init);
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static void __exit ohci_omap3_cleanup(void)
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{
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platform_driver_unregister(&ohci_hcd_omap3_driver);
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}
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module_exit(ohci_omap3_cleanup);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_ALIAS("platform:ohci-omap3");
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MODULE_AUTHOR("Anand Gadiyar <gadiyar@ti.com>");
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MODULE_LICENSE("GPL");
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