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// SPDX-License-Identifier: GPL-1.0+
/*
* OHCI HCD (Host Controller Driver) for USB.
*
* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
* (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
* (C) Copyright 2002 Hewlett-Packard Company
* (C) Copyright 2006 Sylvain Munaut <tnt@246tNt.com>
*
* Bus glue for OHCI HC on the of_platform bus
*
* Modified for of_platform bus from ohci-sa1111.c
*
* This file is licenced under the GPL.
*/
#include <linux/signal.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <asm/prom.h>
static int
ohci_ppc_of_start(struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
int ret;
if ((ret = ohci_init(ohci)) < 0)
return ret;
if ((ret = ohci_run(ohci)) < 0) {
dev_err(hcd->self.controller, "can't start %s\n",
hcd->self.bus_name);
ohci_stop(hcd);
return ret;
}
return 0;
}
static const struct hc_driver ohci_ppc_of_hc_driver = {
.description = hcd_name,
.product_desc = "OF OHCI",
.hcd_priv_size = sizeof(struct ohci_hcd),
/*
* generic hardware linkage
*/
.irq = ohci_irq,
.flags = HCD_USB11 | HCD_DMA | HCD_MEMORY,
/*
* basic lifecycle operations
*/
.start = ohci_ppc_of_start,
.stop = ohci_stop,
.shutdown = ohci_shutdown,
/*
* managing i/o requests and associated device resources
*/
.urb_enqueue = ohci_urb_enqueue,
.urb_dequeue = ohci_urb_dequeue,
.endpoint_disable = ohci_endpoint_disable,
/*
* scheduling support
*/
.get_frame_number = ohci_get_frame,
/*
* root hub support
*/
.hub_status_data = ohci_hub_status_data,
.hub_control = ohci_hub_control,
#ifdef CONFIG_PM
.bus_suspend = ohci_bus_suspend,
.bus_resume = ohci_bus_resume,
#endif
.start_port_reset = ohci_start_port_reset,
};
static int ohci_hcd_ppc_of_probe(struct platform_device *op)
{
struct device_node *dn = op->dev.of_node;
struct usb_hcd *hcd;
struct ohci_hcd *ohci;
struct resource res;
int irq;
int rv;
int is_bigendian;
struct device_node *np;
if (usb_disabled())
return -ENODEV;
is_bigendian =
of_device_is_compatible(dn, "ohci-bigendian") ||
of_device_is_compatible(dn, "ohci-be");
dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
rv = of_address_to_resource(dn, 0, &res);
if (rv)
return rv;
hcd = usb_create_hcd(&ohci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
if (!hcd)
return -ENOMEM;
hcd->rsrc_start = res.start;
hcd->rsrc_len = resource_size(&res);
hcd->regs = devm_ioremap_resource(&op->dev, &res);
if (IS_ERR(hcd->regs)) {
rv = PTR_ERR(hcd->regs);
goto err_rmr;
}
irq = irq_of_parse_and_map(dn, 0);
if (irq == NO_IRQ) {
dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n",
__FILE__);
rv = -EBUSY;
goto err_rmr;
}
ohci = hcd_to_ohci(hcd);
if (is_bigendian) {
ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
if (of_device_is_compatible(dn, "fsl,mpc5200-ohci"))
ohci->flags |= OHCI_QUIRK_FRAME_NO;
if (of_device_is_compatible(dn, "mpc5200-ohci"))
ohci->flags |= OHCI_QUIRK_FRAME_NO;
}
ohci_hcd_init(ohci);
rv = usb_add_hcd(hcd, irq, 0);
if (rv == 0) {
device_wakeup_enable(hcd->self.controller);
return 0;
}
/* by now, 440epx is known to show usb_23 erratum */
np = of_find_compatible_node(NULL, NULL, "ibm,usb-ehci-440epx");
/* Work around - At this point ohci_run has executed, the
* controller is running, everything, the root ports, etc., is
* set up. If the ehci driver is loaded, put the ohci core in
* the suspended state. The ehci driver will bring it out of
* suspended state when / if a non-high speed USB device is
* attached to the USB Host port. If the ehci driver is not
* loaded, do nothing. request_mem_region is used to test if
* the ehci driver is loaded.
*/
if (np != NULL) {
if (!of_address_to_resource(np, 0, &res)) {
if (!request_mem_region(res.start, 0x4, hcd_name)) {
writel_be((readl_be(&ohci->regs->control) |
OHCI_USB_SUSPEND), &ohci->regs->control);
(void) readl_be(&ohci->regs->control);
} else
release_mem_region(res.start, 0x4);
} else
pr_debug("%s: cannot get ehci offset from fdt\n", __FILE__);
of_node_put(np);
}
irq_dispose_mapping(irq);
err_rmr:
usb_put_hcd(hcd);
return rv;
}
static int ohci_hcd_ppc_of_remove(struct platform_device *op)
{
struct usb_hcd *hcd = platform_get_drvdata(op);
dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
usb_remove_hcd(hcd);
irq_dispose_mapping(hcd->irq);
usb_put_hcd(hcd);
return 0;
}
static const struct of_device_id ohci_hcd_ppc_of_match[] = {
#ifdef CONFIG_USB_OHCI_HCD_PPC_OF_BE
{
.name = "usb",
.compatible = "ohci-bigendian",
},
{
.name = "usb",
.compatible = "ohci-be",
},
#endif
#ifdef CONFIG_USB_OHCI_HCD_PPC_OF_LE
{
.name = "usb",
.compatible = "ohci-littledian",
},
{
.name = "usb",
.compatible = "ohci-le",
},
#endif
{},
};
MODULE_DEVICE_TABLE(of, ohci_hcd_ppc_of_match);
#if !defined(CONFIG_USB_OHCI_HCD_PPC_OF_BE) && \
!defined(CONFIG_USB_OHCI_HCD_PPC_OF_LE)
#error "No endianness selected for ppc-of-ohci"
#endif
static struct platform_driver ohci_hcd_ppc_of_driver = {
.probe = ohci_hcd_ppc_of_probe,
.remove = ohci_hcd_ppc_of_remove,
.shutdown = usb_hcd_platform_shutdown,
.driver = {
.name = "ppc-of-ohci",
.of_match_table = ohci_hcd_ppc_of_match,
},
};
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