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