--- /dev/null
+/*
+ * UHCI HCD (Host Controller Driver) for GRLIB GRUSBHC
+ *
+ * Copyright (c) 2011 Jan Andersson <jan@gaisler.com>
+ *
+ * This file is based on UHCI PCI HCD:
+ * (C) Copyright 1999 Linus Torvalds
+ * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
+ * (C) Copyright 1999 Randy Dunlap
+ * (C) Copyright 1999 Georg Acher, acher@in.tum.de
+ * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
+ * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
+ * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
+ * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
+ * support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
+ * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
+ * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
+ */
+
+#include <linux/device.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+
+static int uhci_grlib_init(struct usb_hcd *hcd)
+{
+ struct uhci_hcd *uhci = hcd_to_uhci(hcd);
+
+ /*
+ * Probe to determine the endianness of the controller.
+ * We know that bit 7 of the PORTSC1 register is always set
+ * and bit 15 is always clear. If uhci_readw() yields a value
+ * with bit 7 (0x80) turned on then the current little-endian
+ * setting is correct. Otherwise we assume the value was
+ * byte-swapped; hence the register interface and presumably
+ * also the descriptors are big-endian.
+ */
+ if (!(uhci_readw(uhci, USBPORTSC1) & 0x80)) {
+ uhci->big_endian_mmio = 1;
+ uhci->big_endian_desc = 1;
+ }
+
+ uhci->rh_numports = uhci_count_ports(hcd);
+
+ /* Set up pointers to to generic functions */
+ uhci->reset_hc = uhci_generic_reset_hc;
+ uhci->check_and_reset_hc = uhci_generic_check_and_reset_hc;
+ /* No special actions need to be taken for the functions below */
+ uhci->configure_hc = NULL;
+ uhci->resume_detect_interrupts_are_broken = NULL;
+ uhci->global_suspend_mode_is_broken = NULL;
+
+ /* Reset if the controller isn't already safely quiescent. */
+ check_and_reset_hc(uhci);
+ return 0;
+}
+
+static const struct hc_driver uhci_grlib_hc_driver = {
+ .description = hcd_name,
+ .product_desc = "GRLIB GRUSBHC UHCI Host Controller",
+ .hcd_priv_size = sizeof(struct uhci_hcd),
+
+ /* Generic hardware linkage */
+ .irq = uhci_irq,
+ .flags = HCD_MEMORY | HCD_USB11,
+
+ /* Basic lifecycle operations */
+ .reset = uhci_grlib_init,
+ .start = uhci_start,
+#ifdef CONFIG_PM
+ .pci_suspend = NULL,
+ .pci_resume = NULL,
+ .bus_suspend = uhci_rh_suspend,
+ .bus_resume = uhci_rh_resume,
+#endif
+ .stop = uhci_stop,
+
+ .urb_enqueue = uhci_urb_enqueue,
+ .urb_dequeue = uhci_urb_dequeue,
+
+ .endpoint_disable = uhci_hcd_endpoint_disable,
+ .get_frame_number = uhci_hcd_get_frame_number,
+
+ .hub_status_data = uhci_hub_status_data,
+ .hub_control = uhci_hub_control,
+};
+
+
+static int uhci_hcd_grlib_probe(struct platform_device *op)
+{
+ struct device_node *dn = op->dev.of_node;
+ struct usb_hcd *hcd;
+ struct uhci_hcd *uhci = NULL;
+ struct resource res;
+ int irq;
+ int rv;
+
+ if (usb_disabled())
+ return -ENODEV;
+
+ dev_dbg(&op->dev, "initializing GRUSBHC UHCI USB Controller\n");
+
+ rv = of_address_to_resource(dn, 0, &res);
+ if (rv)
+ return rv;
+
+ /* usb_create_hcd requires dma_mask != NULL */
+ op->dev.dma_mask = &op->dev.coherent_dma_mask;
+ hcd = usb_create_hcd(&uhci_grlib_hc_driver, &op->dev,
+ "GRUSBHC UHCI 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 == NO_IRQ) {
+ printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
+ rv = -EBUSY;
+ goto err_usb;
+ }
+
+ hcd->regs = devm_ioremap_resource(&op->dev, &res);
+ if (IS_ERR(hcd->regs)) {
+ rv = PTR_ERR(hcd->regs);
+ goto err_irq;
+ }
+
+ uhci = hcd_to_uhci(hcd);
+
+ uhci->regs = hcd->regs;
+
+ rv = usb_add_hcd(hcd, irq, 0);
+ if (rv)
+ goto err_irq;
+
+ device_wakeup_enable(hcd->self.controller);
+ return 0;
+
+err_irq:
+ irq_dispose_mapping(irq);
+err_usb:
+ usb_put_hcd(hcd);
+
+ return rv;
+}
+
+static int uhci_hcd_grlib_remove(struct platform_device *op)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(op);
+
+ dev_dbg(&op->dev, "stopping GRLIB GRUSBHC UHCI USB Controller\n");
+
+ usb_remove_hcd(hcd);
+
+ irq_dispose_mapping(hcd->irq);
+ usb_put_hcd(hcd);
+
+ return 0;
+}
+
+/* Make sure the controller is quiescent and that we're not using it
+ * any more. This is mainly for the benefit of programs which, like kexec,
+ * expect the hardware to be idle: not doing DMA or generating IRQs.
+ *
+ * This routine may be called in a damaged or failing kernel. Hence we
+ * do not acquire the spinlock before shutting down the controller.
+ */
+static void uhci_hcd_grlib_shutdown(struct platform_device *op)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(op);
+
+ uhci_hc_died(hcd_to_uhci(hcd));
+}
+
+static const struct of_device_id uhci_hcd_grlib_of_match[] = {
+ { .name = "GAISLER_UHCI", },
+ { .name = "01_027", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, uhci_hcd_grlib_of_match);
+
+
+static struct platform_driver uhci_grlib_driver = {
+ .probe = uhci_hcd_grlib_probe,
+ .remove = uhci_hcd_grlib_remove,
+ .shutdown = uhci_hcd_grlib_shutdown,
+ .driver = {
+ .name = "grlib-uhci",
+ .of_match_table = uhci_hcd_grlib_of_match,
+ },
+};
Code Review / kvmfornfv.git / blobdiff