/*
 * Generic UHCI HCD (Host Controller Driver) for Platform Devices
 *
 * Copyright (c) 2011 Tony Prisk <linux@prisktech.co.nz>
 *
 * This file is based on uhci-grlib.c
 * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
 */

#include <linux/of.h>
#include <linux/device.h>
#include <linux/platform_device.h>

static int uhci_platform_init(struct usb_hcd *hcd)
{
	struct uhci_hcd *uhci = hcd_to_uhci(hcd);

	uhci->rh_numports = uhci_count_ports(hcd);

	/* Set up pointers to 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_platform_hc_driver = {
	.description =		hcd_name,
	.product_desc =		"Generic UHCI Host Controller",
	.hcd_priv_size =	sizeof(struct uhci_hcd),

	/* Generic hardware linkage */
	.irq =			uhci_irq,
	.flags =		HCD_MEMORY | HCD_USB11,

	/* Basic lifecycle operations */
	.reset =		uhci_platform_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_platform_probe(struct platform_device *pdev)
{
	struct usb_hcd *hcd;
	struct uhci_hcd	*uhci;
	struct resource *res;
	int ret;

	if (usb_disabled())
		return -ENODEV;

	/*
	 * Right now device-tree probed devices don't get dma_mask set.
	 * Since shared usb code relies on it, set it here for now.
	 * Once we have dma capability bindings this can go away.
	 */
	ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
	if (ret)
		return ret;

	hcd = usb_create_hcd(&uhci_platform_hc_driver, &pdev->dev,
			pdev->name);
	if (!hcd)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(hcd->regs)) {
		ret = PTR_ERR(hcd->regs);
		goto err_rmr;
	}
	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);

	uhci = hcd_to_uhci(hcd);

	uhci->regs = hcd->regs;

	ret = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
	if (ret)
		goto err_rmr;

	device_wakeup_enable(hcd->self.controller);
	return 0;

err_rmr:
	usb_put_hcd(hcd);

	return ret;
}

static int uhci_hcd_platform_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);

	usb_remove_hcd(hcd);
	usb_put_hcd(hcd);

	return 0;
}

/* 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_platform_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 platform_uhci_ids[] = {
	{ .compatible = "generic-uhci", },
	{ .compatible = "platform-uhci", },
	{}
};
MODULE_DEVICE_TABLE(of, platform_uhci_ids);

static struct platform_driver uhci_platform_driver = {
	.probe		= uhci_hcd_platform_probe,
	.remove		= uhci_hcd_platform_remove,
	.shutdown	= uhci_hcd_platform_shutdown,
	.driver = {
		.name = "platform-uhci",
		.of_match_table = platform_uhci_ids,
	},
};
tion><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Ard Biesheuvel &lt;ard.biesheuvel@linaro.org&gt;</td><td class='right'>2017-02-01 17:45:02 +0000</td></tr>
<tr><th>committer</th><td>Ingo Molnar &lt;mingo@kernel.org&gt;</td><td class='right'>2017-02-01 21:17:49 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/mac80211.h?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>c8f325a59cfc718d13a50fbc746ed9b415c25e92</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/net/mac80211.h?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>d53fbdac9d0781e39a13b2ac6b2bd258cf3b4140</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/net/mac80211.h?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>include/net/mac80211.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/mac80211.h?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>bf29bddf0417a4783da3b24e8c9e017ac649326f</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/net/mac80211.h?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92&amp;id2=bf29bddf0417a4783da3b24e8c9e017ac649326f'>diff</a>)</td></tr></table>
<div class='commit-subject'>efi/fdt: Avoid FDT manipulation after ExitBootServices()</div><div class='commit-msg'>Some AArch64 UEFI implementations disable the MMU in ExitBootServices(),
after which unaligned accesses to RAM are no longer supported.

Commit:

  abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel")

fixed an issue in the memory map handling of the stub FDT code, but
inadvertently created an issue with such firmware, by moving some
of the FDT manipulation to after the invocation of ExitBootServices().

Given that the stub's libfdt implementation uses the ordinary, accelerated
string functions, which rely on hardware handling of unaligned accesses,
manipulating the FDT with the MMU off may result in alignment faults.

So fix the situation by moving the update_fdt_memmap() call into the
callback function invoked by efi_exit_boot_services() right before it
calls the ExitBootServices() UEFI service (which is arguably a better
place for it anyway)

Note that disabling the MMU in ExitBootServices() is not compliant with
the UEFI spec, and carries great risk due to the fact that switching from
cached to uncached memory accesses halfway through compiler generated code
(i.e., involving a stack) can never be done in a way that is architecturally
safe.

Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel")
Signed-off-by: Ard Biesheuvel &lt;ard.biesheuvel@linaro.org&gt;
Tested-by: Riku Voipio &lt;riku.voipio@linaro.org&gt;
Cc: &lt;stable@vger.kernel.org&gt;
Cc: mark.rutland@arm.com
Cc: linux-efi@vger.kernel.org
Cc: matt@codeblueprint.co.uk
Cc: leif.lindholm@linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar &lt;mingo@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>Diffstat</a> (limited to 'include/net/mac80211.h')</div><table summary='diffstat' class='diffstat'>