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