// SPDX-License-Identifier: GPL-2.0
/*
* 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>
#include <linux/platform_device.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 ( 0 x80 ) 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) & 0 x80)) {
uhci->big_endian_mmio = 1 ;
uhci->big_endian_desc = 1 ;
}
uhci->rh_numports = uhci_count_ports(hcd);
/* Set up pointers 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_DMA | 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) {
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 void 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);
}
/* 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,
},
};
Messung V0.5 in Prozent C=89 H=81 G=84
¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-09-29)
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