// SPDX-License-Identifier: GPL-2.0
/*
 * Raspberry Pi 4 firmware reset driver
 *
 * Copyright (C) 2020 Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
 */
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <soc/bcm2835/raspberrypi-firmware.h>
#include <dt-bindings/reset/raspberrypi,firmware-reset.h>

struct rpi_reset {
	struct reset_controller_dev rcdev;
	struct rpi_firmware *fw;
};

static inline struct rpi_reset *to_rpi(struct reset_controller_dev *rcdev)
{
	return container_of(rcdev, struct rpi_reset, rcdev);
}

static int rpi_reset_reset(struct reset_controller_dev *rcdev, unsigned long id)
{
	struct rpi_reset *priv = to_rpi(rcdev);
	u32 dev_addr;
	int ret;

	switch (id) {
	case RASPBERRYPI_FIRMWARE_RESET_ID_USB:
		/*
		 * The Raspberry Pi 4 gets its USB functionality from VL805, a
		 * PCIe chip that implements xHCI. After a PCI reset, VL805's
		 * firmware may either be loaded directly from an EEPROM or, if
		 * not present, by the SoC's co-processor, VideoCore. rpi's
		 * VideoCore OS contains both the non public firmware load
		 * logic and the VL805 firmware blob. This triggers the
		 * aforementioned process.
		 *
		 * The pci device address is expected is expected by the
		 * firmware encoded like this:
		 *
		 *	PCI_BUS << 20 | PCI_SLOT << 15 | PCI_FUNC << 12
		 *
		 * But since rpi's PCIe is hardwired, we know the address in
		 * advance.
		 */
		dev_addr = 0x100000;
		ret = rpi_firmware_property(priv->fw, RPI_FIRMWARE_NOTIFY_XHCI_RESET,
					    &dev_addr, sizeof(dev_addr));
		if (ret)
			return ret;

		/* Wait for vl805 to startup */
		usleep_range(200, 1000);
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

static const struct reset_control_ops rpi_reset_ops = {
	.reset	= rpi_reset_reset,
};

static int rpi_reset_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct rpi_firmware *fw;
	struct device_node *np;
	struct rpi_reset *priv;

	np = of_get_parent(dev->of_node);
	if (!np) {
		dev_err(dev, "Missing firmware node\n");
		return -ENOENT;
	}

	fw = devm_rpi_firmware_get(&pdev->dev, np);
	of_node_put(np);
	if (!fw)
		return -EPROBE_DEFER;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	dev_set_drvdata(dev, priv);

	priv->fw = fw;
	priv->rcdev.owner = THIS_MODULE;
	priv->rcdev.nr_resets = RASPBERRYPI_FIRMWARE_RESET_NUM_IDS;
	priv->rcdev.ops = &rpi_reset_ops;
	priv->rcdev.of_node = dev->of_node;

	return devm_reset_controller_register(dev, &priv->rcdev);
}

static const struct of_device_id rpi_reset_of_match[] = {
	{ .compatible = "raspberrypi,firmware-reset" },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, rpi_reset_of_match);

static struct platform_driver rpi_reset_driver = {
	.probe	= rpi_reset_probe,
	.driver	= {
		.name = "raspberrypi-reset",
		.of_match_table = rpi_reset_of_match,
	},
};
module_platform_driver(rpi_reset_driver);

MODULE_AUTHOR("Nicolas Saenz Julienne <nsaenzjulienne@suse.de>");
MODULE_DESCRIPTION("Raspberry Pi 4 firmware reset driver");
MODULE_LICENSE("GPL");
><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>Julian Wiedmann &lt;jwi@linux.ibm.com&gt;</td><td class='right'>2020-02-17 13:27:58 +0100</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2020-02-17 14:30:54 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='sha1'><a href='/cgit/git.armlinux.org.uk/linux-net-next.git/commit/?id=bd706ff8ea2b6e2d3f21f0863b2fc42f860f8ba2'>bd706ff8ea2b6e2d3f21f0863b2fc42f860f8ba2</a> (<a href='/cgit/git.armlinux.org.uk/linux-net-next.git/patch/?id=bd706ff8ea2b6e2d3f21f0863b2fc42f860f8ba2'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='sha1'><a href='/cgit/git.armlinux.org.uk/linux-net-next.git/tree/?id=bd706ff8ea2b6e2d3f21f0863b2fc42f860f8ba2'>ea4e9fd226dcaec59d14d0b17b6998982bdb69c3</a></td></tr>
<tr><th>parent</th><td colspan='2' class='sha1'><a href='/cgit/git.armlinux.org.uk/linux-net-next.git/commit/?id=3e07df430c2b4ffe003085a0b3e6b0b041187632'>3e07df430c2b4ffe003085a0b3e6b0b041187632</a> (<a href='/cgit/git.armlinux.org.uk/linux-net-next.git/diff/?id=bd706ff8ea2b6e2d3f21f0863b2fc42f860f8ba2&amp;id2=3e07df430c2b4ffe003085a0b3e6b0b041187632'>diff</a>)</td></tr></table>
<div class='commit-subject'>net: vlan: suppress "failed to kill vid" warnings</div><div class='commit-msg'>When a real dev unregisters, vlan_device_event() also unregisters all
of its vlan interfaces. For each VID this ends up in __vlan_vid_del(),
which attempts to remove the VID from the real dev's VLAN filter.

But the unregistering real dev might no longer be able to issue the
required IOs, and return an error. Subsequently we raise a noisy warning
msg that is not appropriate for this situation: the real dev is being
torn down anyway, there shouldn't be any worry about cleanly releasing
all of its HW-internal resources.

So to avoid scaring innocent users, suppress this warning when the
failed deletion happens on an unregistering device.
While at it also convert the raw pr_warn() to a more fitting
netdev_warn().

Signed-off-by: Julian Wiedmann &lt;jwi@linux.ibm.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit/git.armlinux.org.uk/linux-net-next.git/diff/?id=bd706ff8ea2b6e2d3f21f0863b2fc42f860f8ba2'>Diffstat</a></div><table summary='diffstat' class='diffstat'>