--- /dev/null
+/*
+ * 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/err.h>
+#include <linux/signal.h>
+
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.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 | HCD_BH,
+
+ /*
+ * 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 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);
+
+ irq = irq_of_parse_and_map(dn, 0);
+ if (!irq) {
+ dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n",
+ __FILE__);
+ rv = -EBUSY;
+ goto err_irq;
+ }
+
+ hcd->regs = devm_ioremap_resource(&op->dev, &res);
+ if (IS_ERR(hcd->regs)) {
+ rv = PTR_ERR(hcd->regs);
+ goto err_irq;
+ }
+
+ 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) {
+ device_wakeup_enable(hcd->self.controller);
+ return 0;
+ }
+
+err_irq:
+ 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 = platform_get_drvdata(op);
+
+ dev_dbg(&op->dev, "stopping XILINX-OF USB Controller\n");
+
+ usb_remove_hcd(hcd);
+
+ usb_put_hcd(hcd);
+
+ return 0;
+}
+
+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 = usb_hcd_platform_shutdown,
+ .driver = {
+ .name = "xilinx-of-ehci",
+ .of_match_table = ehci_hcd_xilinx_of_match,
+ },
+};
Code Review / kvmfornfv.git / blobdiff