alistair23-linux/drivers/usb/host/ohci-ppc-of.c

// 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__);
	}

	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,
	},
};