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/*
* Copyright (C) 2025 Michael Brown <mbrown@fensystems.co.uk>.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <ipxe/timer.h>
#include <ipxe/devtree.h>
#include <ipxe/fdt.h>
#include "dwusb.h"
/** @file
*
* Synopsys DesignWare USB3 host controller driver
*
*/
/**
* Probe devicetree device
*
* @v dt Devicetree device
* @v offset Starting node offset
* @ret rc Return status code
*/
static int dwusb_probe ( struct dt_device *dt, unsigned int offset ) {
struct xhci_device *xhci;
uint32_t gctl;
int rc;
/* Allocate and initialise structure */
xhci = zalloc ( sizeof ( *xhci ) );
if ( ! xhci ) {
rc = -ENOMEM;
goto err_alloc;
}
xhci->dev = &dt->dev;
xhci->dma = &dt->dma;
/* Map registers */
xhci->regs = dt_ioremap ( dt, offset, 0, 0 );
if ( ! xhci->regs ) {
rc = -ENODEV;
goto err_ioremap;
}
/* Reset via global core control register */
gctl = readl ( xhci->regs + DWUSB_GCTL );
writel ( ( gctl | DWUSB_GCTL_RESET ), ( xhci->regs + DWUSB_GCTL ) );
mdelay ( 100 );
writel ( gctl, ( xhci->regs + DWUSB_GCTL ) );
/* Configure as a host controller */
gctl &= ~DWUSB_GCTL_PRTDIR_MASK;
gctl |= DWUSB_GCTL_PRTDIR_HOST;
writel ( gctl, ( xhci->regs + DWUSB_GCTL ) );
/* Initialise xHCI device */
xhci_init ( xhci );
/* Register xHCI device */
if ( ( rc = xhci_register ( xhci ) ) != 0 ) {
DBGC ( xhci, "XHCI %s could not register: %s\n",
xhci->name, strerror ( rc ) );
goto err_register;
}
dt_set_drvdata ( dt, xhci );
return 0;
xhci_unregister ( xhci );
err_register:
iounmap ( xhci->regs );
err_ioremap:
free ( xhci );
err_alloc:
return rc;
}
/**
* Remove devicetree device
*
* @v dt Devicetree device
*/
static void dwusb_remove ( struct dt_device *dt ) {
struct xhci_device *xhci = dt_get_drvdata ( dt );
/* Unregister xHCI device */
xhci_unregister ( xhci );
/* Unmap registers */
iounmap ( xhci->regs );
/* Free device */
free ( xhci );
}
/** DesignWare USB3 compatible model identifiers */
static const char * dwusb_ids[] = {
"snps,dwc3",
};
/** DesignWare USB3 devicetree driver */
struct dt_driver dwusb_driver __dt_driver = {
.name = "dwusb",
.ids = dwusb_ids,
.id_count = ( sizeof ( dwusb_ids ) / sizeof ( dwusb_ids[0] ) ),
.probe = dwusb_probe,
.remove = dwusb_remove,
};
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