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194 lines
5.1 KiB
194 lines
5.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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 <[email protected]> |
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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, [email protected] |
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* (C) Copyright 1999 Randy Dunlap |
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* (C) Copyright 1999 Georg Acher, [email protected] |
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* (C) Copyright 1999 Deti Fliegl, [email protected] |
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* (C) Copyright 1999 Thomas Sailer, [email protected] |
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* (C) Copyright 1999 Roman Weissgaerber, [email protected] |
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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, [email protected]). |
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* (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c) |
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* (C) Copyright 2004-2007 Alan Stern, [email protected] |
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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_DMA | 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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.of_match_table = uhci_hcd_grlib_of_match, |
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}, |
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};
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