239 lines
6.4 KiB
C
239 lines
6.4 KiB
C
/*
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* EHCI HCD (Host Controller Driver) for USB.
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*
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* Bus Glue for Xilinx EHCI core on the of_platform bus
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*
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* Copyright (c) 2009 Xilinx, Inc.
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*
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* Based on "ehci-ppc-of.c" by Valentine Barshak <vbarshak@ru.mvista.com>
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* and "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de>
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* and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* 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 Foundation,
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* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/err.h>
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#include <linux/signal.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/of_address.h>
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/**
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* ehci_xilinx_port_handed_over - hand the port out if failed to enable it
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* @hcd: Pointer to the usb_hcd device to which the host controller bound
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* @portnum:Port number to which the device is attached.
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*
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* This function is used as a place to tell the user that the Xilinx USB host
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* controller does support LS devices. And in an HS only configuration, it
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* does not support FS devices either. It is hoped that this can help a
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* confused user.
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*
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* There are cases when the host controller fails to enable the port due to,
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* for example, insufficient power that can be supplied to the device from
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* the USB bus. In those cases, the messages printed here are not helpful.
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*/
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static int ehci_xilinx_port_handed_over(struct usb_hcd *hcd, int portnum)
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{
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dev_warn(hcd->self.controller, "port %d cannot be enabled\n", portnum);
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if (hcd->has_tt) {
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dev_warn(hcd->self.controller,
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"Maybe you have connected a low speed device?\n");
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dev_warn(hcd->self.controller,
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"We do not support low speed devices\n");
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} else {
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dev_warn(hcd->self.controller,
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"Maybe your device is not a high speed device?\n");
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dev_warn(hcd->self.controller,
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"The USB host controller does not support full speed "
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"nor low speed devices\n");
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dev_warn(hcd->self.controller,
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"You can reconfigure the host controller to have "
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"full speed support\n");
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}
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return 0;
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}
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static const struct hc_driver ehci_xilinx_of_hc_driver = {
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.description = hcd_name,
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.product_desc = "OF EHCI",
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.hcd_priv_size = sizeof(struct ehci_hcd),
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/*
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* generic hardware linkage
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*/
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.irq = ehci_irq,
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.flags = HCD_MEMORY | HCD_USB2 | HCD_BH,
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/*
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* basic lifecycle operations
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*/
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.reset = ehci_setup,
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.start = ehci_run,
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.stop = ehci_stop,
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.shutdown = ehci_shutdown,
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/*
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* managing i/o requests and associated device resources
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*/
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.urb_enqueue = ehci_urb_enqueue,
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.urb_dequeue = ehci_urb_dequeue,
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.endpoint_disable = ehci_endpoint_disable,
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.endpoint_reset = ehci_endpoint_reset,
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/*
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* scheduling support
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*/
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.get_frame_number = ehci_get_frame,
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/*
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* root hub support
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*/
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.hub_status_data = ehci_hub_status_data,
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.hub_control = ehci_hub_control,
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#ifdef CONFIG_PM
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.bus_suspend = ehci_bus_suspend,
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.bus_resume = ehci_bus_resume,
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#endif
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.relinquish_port = NULL,
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.port_handed_over = ehci_xilinx_port_handed_over,
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.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
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};
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/**
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* ehci_hcd_xilinx_of_probe - Probe method for the USB host controller
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* @op: pointer to the platform_device bound to the host controller
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*
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* This function requests resources and sets up appropriate properties for the
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* host controller. Because the Xilinx USB host controller can be configured
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* as HS only or HS/FS only, it checks the configuration in the device tree
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* entry, and sets an appropriate value for hcd->has_tt.
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*/
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static int ehci_hcd_xilinx_of_probe(struct platform_device *op)
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{
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struct device_node *dn = op->dev.of_node;
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struct usb_hcd *hcd;
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struct ehci_hcd *ehci;
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struct resource res;
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int irq;
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int rv;
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int *value;
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if (usb_disabled())
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return -ENODEV;
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dev_dbg(&op->dev, "initializing XILINX-OF USB Controller\n");
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rv = of_address_to_resource(dn, 0, &res);
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if (rv)
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return rv;
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hcd = usb_create_hcd(&ehci_xilinx_of_hc_driver, &op->dev,
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"XILINX-OF USB");
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if (!hcd)
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return -ENOMEM;
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hcd->rsrc_start = res.start;
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hcd->rsrc_len = resource_size(&res);
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irq = irq_of_parse_and_map(dn, 0);
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if (!irq) {
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printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
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rv = -EBUSY;
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goto err_irq;
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}
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hcd->regs = devm_ioremap_resource(&op->dev, &res);
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if (IS_ERR(hcd->regs)) {
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rv = PTR_ERR(hcd->regs);
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goto err_irq;
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}
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ehci = hcd_to_ehci(hcd);
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/* This core always has big-endian register interface and uses
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* big-endian memory descriptors.
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*/
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ehci->big_endian_mmio = 1;
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ehci->big_endian_desc = 1;
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/* Check whether the FS support option is selected in the hardware.
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*/
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value = (int *)of_get_property(dn, "xlnx,support-usb-fs", NULL);
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if (value && (*value == 1)) {
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ehci_dbg(ehci, "USB host controller supports FS devices\n");
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hcd->has_tt = 1;
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} else {
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ehci_dbg(ehci,
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"USB host controller is HS only\n");
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hcd->has_tt = 0;
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}
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/* Debug registers are at the first 0x100 region
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*/
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ehci->caps = hcd->regs + 0x100;
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rv = usb_add_hcd(hcd, irq, 0);
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if (rv == 0)
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return 0;
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err_irq:
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usb_put_hcd(hcd);
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return rv;
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}
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/**
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* ehci_hcd_xilinx_of_remove - shutdown hcd and release resources
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* @op: pointer to platform_device structure that is to be removed
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*
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* Remove the hcd structure, and release resources that has been requested
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* during probe.
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*/
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static int ehci_hcd_xilinx_of_remove(struct platform_device *op)
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{
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struct usb_hcd *hcd = platform_get_drvdata(op);
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dev_dbg(&op->dev, "stopping XILINX-OF USB Controller\n");
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usb_remove_hcd(hcd);
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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 ehci_hcd_xilinx_of_match[] = {
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{.compatible = "xlnx,xps-usb-host-1.00.a",},
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{},
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};
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MODULE_DEVICE_TABLE(of, ehci_hcd_xilinx_of_match);
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static struct platform_driver ehci_hcd_xilinx_of_driver = {
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.probe = ehci_hcd_xilinx_of_probe,
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.remove = ehci_hcd_xilinx_of_remove,
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.shutdown = usb_hcd_platform_shutdown,
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.driver = {
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.name = "xilinx-of-ehci",
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.owner = THIS_MODULE,
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.of_match_table = ehci_hcd_xilinx_of_match,
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},
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};
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