kernel-fxtec-pro1x/drivers/usb/host/ehci-xilinx-of.c
Alan Stern 1a49e2ac96 EHCI: centralize controller initialization
This patch (as1564c) converts the EHCI platform drivers to use the
central ehci_setup() routine for generic controller initialization
rather than each having its own idiosyncratic approach.

The major point of difficulty lies in ehci-pci's many vendor- and
device-specific workarounds.  Some of them have to be applied before
calling ehci_setup() and some after, which necessitates a fair amount
of code motion.  The other platform drivers require much smaller
changes.

One point not addressed by the patch is whether ports should be
powered on or off following initialization.  The different drivers
appear to handle this pretty much at random.  In fact it shouldn't
matter, because the hub driver turns on power to all ports when it
binds to the root hub.  Straightening that out will be left for
another day.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-09 13:35:05 -07:00

268 lines
7.1 KiB
C

/*
* EHCI HCD (Host Controller Driver) for USB.
*
* Bus Glue for Xilinx EHCI core on the of_platform bus
*
* Copyright (c) 2009 Xilinx, Inc.
*
* Based on "ehci-ppc-of.c" by Valentine Barshak <vbarshak@ru.mvista.com>
* and "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de>
* and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <linux/signal.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
/**
* ehci_xilinx_port_handed_over - hand the port out if failed to enable it
* @hcd: Pointer to the usb_hcd device to which the host controller bound
* @portnum:Port number to which the device is attached.
*
* This function is used as a place to tell the user that the Xilinx USB host
* controller does support LS devices. And in an HS only configuration, it
* does not support FS devices either. It is hoped that this can help a
* confused user.
*
* There are cases when the host controller fails to enable the port due to,
* for example, insufficient power that can be supplied to the device from
* the USB bus. In those cases, the messages printed here are not helpful.
*/
static int ehci_xilinx_port_handed_over(struct usb_hcd *hcd, int portnum)
{
dev_warn(hcd->self.controller, "port %d cannot be enabled\n", portnum);
if (hcd->has_tt) {
dev_warn(hcd->self.controller,
"Maybe you have connected a low speed device?\n");
dev_warn(hcd->self.controller,
"We do not support low speed devices\n");
} else {
dev_warn(hcd->self.controller,
"Maybe your device is not a high speed device?\n");
dev_warn(hcd->self.controller,
"The USB host controller does not support full speed "
"nor low speed devices\n");
dev_warn(hcd->self.controller,
"You can reconfigure the host controller to have "
"full speed support\n");
}
return 0;
}
static const struct hc_driver ehci_xilinx_of_hc_driver = {
.description = hcd_name,
.product_desc = "OF EHCI",
.hcd_priv_size = sizeof(struct ehci_hcd),
/*
* generic hardware linkage
*/
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
/*
* basic lifecycle operations
*/
.reset = ehci_setup,
.start = ehci_run,
.stop = ehci_stop,
.shutdown = ehci_shutdown,
/*
* managing i/o requests and associated device resources
*/
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
.endpoint_reset = ehci_endpoint_reset,
/*
* scheduling support
*/
.get_frame_number = ehci_get_frame,
/*
* root hub support
*/
.hub_status_data = ehci_hub_status_data,
.hub_control = ehci_hub_control,
#ifdef CONFIG_PM
.bus_suspend = ehci_bus_suspend,
.bus_resume = ehci_bus_resume,
#endif
.relinquish_port = NULL,
.port_handed_over = ehci_xilinx_port_handed_over,
.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};
/**
* ehci_hcd_xilinx_of_probe - Probe method for the USB host controller
* @op: pointer to the platform_device bound to the host controller
*
* This function requests resources and sets up appropriate properties for the
* host controller. Because the Xilinx USB host controller can be configured
* as HS only or HS/FS only, it checks the configuration in the device tree
* entry, and sets an appropriate value for hcd->has_tt.
*/
static int __devinit ehci_hcd_xilinx_of_probe(struct platform_device *op)
{
struct device_node *dn = op->dev.of_node;
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
struct resource res;
int irq;
int rv;
int *value;
if (usb_disabled())
return -ENODEV;
dev_dbg(&op->dev, "initializing XILINX-OF USB Controller\n");
rv = of_address_to_resource(dn, 0, &res);
if (rv)
return rv;
hcd = usb_create_hcd(&ehci_xilinx_of_hc_driver, &op->dev,
"XILINX-OF USB");
if (!hcd)
return -ENOMEM;
hcd->rsrc_start = res.start;
hcd->rsrc_len = resource_size(&res);
if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__);
rv = -EBUSY;
goto err_rmr;
}
irq = irq_of_parse_and_map(dn, 0);
if (!irq) {
printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
rv = -EBUSY;
goto err_irq;
}
hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
if (!hcd->regs) {
printk(KERN_ERR "%s: ioremap failed\n", __FILE__);
rv = -ENOMEM;
goto err_ioremap;
}
ehci = hcd_to_ehci(hcd);
/* This core always has big-endian register interface and uses
* big-endian memory descriptors.
*/
ehci->big_endian_mmio = 1;
ehci->big_endian_desc = 1;
/* Check whether the FS support option is selected in the hardware.
*/
value = (int *)of_get_property(dn, "xlnx,support-usb-fs", NULL);
if (value && (*value == 1)) {
ehci_dbg(ehci, "USB host controller supports FS devices\n");
hcd->has_tt = 1;
} else {
ehci_dbg(ehci,
"USB host controller is HS only\n");
hcd->has_tt = 0;
}
/* Debug registers are at the first 0x100 region
*/
ehci->caps = hcd->regs + 0x100;
rv = usb_add_hcd(hcd, irq, 0);
if (rv == 0)
return 0;
iounmap(hcd->regs);
err_ioremap:
err_irq:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err_rmr:
usb_put_hcd(hcd);
return rv;
}
/**
* ehci_hcd_xilinx_of_remove - shutdown hcd and release resources
* @op: pointer to platform_device structure that is to be removed
*
* Remove the hcd structure, and release resources that has been requested
* during probe.
*/
static int ehci_hcd_xilinx_of_remove(struct platform_device *op)
{
struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
dev_set_drvdata(&op->dev, NULL);
dev_dbg(&op->dev, "stopping XILINX-OF USB Controller\n");
usb_remove_hcd(hcd);
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
return 0;
}
/**
* ehci_hcd_xilinx_of_shutdown - shutdown the hcd
* @op: pointer to platform_device structure that is to be removed
*
* Properly shutdown the hcd, call driver's shutdown routine.
*/
static void ehci_hcd_xilinx_of_shutdown(struct platform_device *op)
{
struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
if (hcd->driver->shutdown)
hcd->driver->shutdown(hcd);
}
static const struct of_device_id ehci_hcd_xilinx_of_match[] = {
{.compatible = "xlnx,xps-usb-host-1.00.a",},
{},
};
MODULE_DEVICE_TABLE(of, ehci_hcd_xilinx_of_match);
static struct platform_driver ehci_hcd_xilinx_of_driver = {
.probe = ehci_hcd_xilinx_of_probe,
.remove = ehci_hcd_xilinx_of_remove,
.shutdown = ehci_hcd_xilinx_of_shutdown,
.driver = {
.name = "xilinx-of-ehci",
.owner = THIS_MODULE,
.of_match_table = ehci_hcd_xilinx_of_match,
},
};