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/*
* 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/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/dma-mapping.h>
/*-------------------------------------------------------------------------*/
static int ohci_omap3_init(struct usb_hcd *hcd)
{
dev_dbg(hcd->self.controller, "starting OHCI controller\n");
return ohci_init(hcd_to_ohci(hcd));
}
/*-------------------------------------------------------------------------*/
static int ohci_omap3_start(struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
int ret;
/*
* RemoteWakeupConnected has to be set explicitly before
* calling ohci_run. The reset value of RWC is 0.
*/
ohci->hc_control = OHCI_CTRL_RWC;
writel(OHCI_CTRL_RWC, &ohci->regs->control);
ret = ohci_run(ohci);
if (ret < 0) {
dev_err(hcd->self.controller, "can't start\n");
ohci_stop(hcd);
}
return ret;
}
/*-------------------------------------------------------------------------*/
static const struct hc_driver ohci_omap3_hc_driver = {
.description = hcd_name,
.product_desc = "OMAP3 OHCI Host Controller",
.hcd_priv_size = sizeof(struct ohci_hcd),
/*
* generic hardware linkage
*/
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_MEMORY,
/*
* basic lifecycle operations
*/
.reset = ohci_omap3_init,
.start = ohci_omap3_start,
.stop = ohci_stop,
.shutdown = ohci_shutdown,
/*
* managing i/o requests and associated device resources
*/
.urb_enqueue = ohci_urb_enqueue,
.urb_dequeue = ohci_urb_dequeue,
.endpoint_disable = ohci_endpoint_disable,
/*
* scheduling support
*/
.get_frame_number = ohci_get_frame,
/*
* root hub support
*/
.hub_status_data = ohci_hub_status_data,
.hub_control = ohci_hub_control,
#ifdef CONFIG_PM
.bus_suspend = ohci_bus_suspend,
.bus_resume = ohci_bus_resume,
#endif
.start_port_reset = ohci_start_port_reset,
};
/*-------------------------------------------------------------------------*/
/*
* 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 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_init(hcd_to_ohci(hcd));
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;
}
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,
},
};
MODULE_ALIAS("platform:ohci-omap3");
MODULE_AUTHOR("Anand Gadiyar <gadiyar@ti.com>");
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