/*
 * phy-keystone - USB PHY, talking to dwc3 controller in Keystone.
 *
 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
 * 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.
 *
 * Author: WingMan Kwok <w-kwok2@ti.com>
 *
 * 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.
 *
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/usb/usb_phy_generic.h>
#include <linux/io.h>
#include <linux/of.h>

#include "phy-generic.h"

/* USB PHY control register offsets */
#define USB_PHY_CTL_UTMI		0x0000
#define USB_PHY_CTL_PIPE		0x0004
#define USB_PHY_CTL_PARAM_1		0x0008
#define USB_PHY_CTL_PARAM_2		0x000c
#define USB_PHY_CTL_CLOCK		0x0010
#define USB_PHY_CTL_PLL			0x0014

#define PHY_REF_SSP_EN			BIT(29)

struct keystone_usbphy {
	struct usb_phy_generic	usb_phy_gen;
	void __iomem			*phy_ctrl;
};

static inline u32 keystone_usbphy_readl(void __iomem *base, u32 offset)
{
	return readl(base + offset);
}

static inline void keystone_usbphy_writel(void __iomem *base,
					  u32 offset, u32 value)
{
	writel(value, base + offset);
}

static int keystone_usbphy_init(struct usb_phy *phy)
{
	struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
	u32 val;

	val  = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
	keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
				val | PHY_REF_SSP_EN);
	return 0;
}

static void keystone_usbphy_shutdown(struct usb_phy *phy)
{
	struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
	u32 val;

	val  = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
	keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
				val &= ~PHY_REF_SSP_EN);
}

static int keystone_usbphy_probe(struct platform_device *pdev)
{
	struct device		*dev = &pdev->dev;
	struct keystone_usbphy	*k_phy;
	struct resource		*res;
	int ret;

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

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	k_phy->phy_ctrl = devm_ioremap_resource(dev, res);
	if (IS_ERR(k_phy->phy_ctrl))
		return PTR_ERR(k_phy->phy_ctrl);

	ret = usb_phy_gen_create_phy(dev, &k_phy->usb_phy_gen, NULL);
	if (ret)
		return ret;

	k_phy->usb_phy_gen.phy.init = keystone_usbphy_init;
	k_phy->usb_phy_gen.phy.shutdown = keystone_usbphy_shutdown;

	platform_set_drvdata(pdev, k_phy);

	return usb_add_phy_dev(&k_phy->usb_phy_gen.phy);
}

static int keystone_usbphy_remove(struct platform_device *pdev)
{
	struct keystone_usbphy *k_phy = platform_get_drvdata(pdev);

	usb_remove_phy(&k_phy->usb_phy_gen.phy);

	return 0;
}

static const struct of_device_id keystone_usbphy_ids[] = {
	{ .compatible = "ti,keystone-usbphy" },
	{ }
};
MODULE_DEVICE_TABLE(of, keystone_usbphy_ids);

static struct platform_driver keystone_usbphy_driver = {
	.probe          = keystone_usbphy_probe,
	.remove         = keystone_usbphy_remove,
	.driver         = {
		.name   = "keystone-usbphy",
		.of_match_table = keystone_usbphy_ids,
	},
};

module_platform_driver(keystone_usbphy_driver);

MODULE_ALIAS("platform:keystone-usbphy");
MODULE_AUTHOR("Texas Instruments Inc.");
MODULE_DESCRIPTION("Keystone USB phy driver");
MODULE_LICENSE("GPL v2");
a8f23915e92932f11eb063e37d70556a89'>xhci-rcar.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='f5b0cba8f23915e92932f11eb063e37d70556a89'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><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>Ondrej Kozina &lt;okozina@redhat.com&gt;</td><td class='right'>2017-01-31 15:47:11 +0100</td></tr>
<tr><th>committer</th><td>Mike Snitzer &lt;snitzer@redhat.com&gt;</td><td class='right'>2017-02-03 10:26:14 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host/xhci-rcar.h?h=nds-private-remove&amp;id=f5b0cba8f23915e92932f11eb063e37d70556a89'>f5b0cba8f23915e92932f11eb063e37d70556a89</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/host/xhci-rcar.h?id=f5b0cba8f23915e92932f11eb063e37d70556a89'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=f5b0cba8f23915e92932f11eb063e37d70556a89'>19f7ccac636459333cca52027914d19084b1392b</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/host/xhci-rcar.h?h=nds-private-remove&amp;id=f5b0cba8f23915e92932f11eb063e37d70556a89'>drivers/usb/host/xhci-rcar.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host/xhci-rcar.h?h=nds-private-remove&amp;id=4087a1fffe38106e10646606a27f10d40451862d'>4087a1fffe38106e10646606a27f10d40451862d</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/host/xhci-rcar.h?h=nds-private-remove&amp;id=f5b0cba8f23915e92932f11eb063e37d70556a89&amp;id2=4087a1fffe38106e10646606a27f10d40451862d'>diff</a>)</td></tr></table>
<div class='commit-subject'>dm crypt: replace RCU read-side section with rwsem</div><div class='commit-msg'>The lockdep splat below hints at a bug in RCU usage in dm-crypt that
was introduced with commit c538f6ec9f56 ("dm crypt: add ability to use
keys from the kernel key retention service").  The kernel keyring
function user_key_payload() is in fact a wrapper for
rcu_dereference_protected() which must not be called with only
rcu_read_lock() section mark.

Unfortunately the kernel keyring subsystem doesn't currently provide
an interface that allows the use of an RCU read-side section.  So for
now we must drop RCU in favour of rwsem until a proper function is
made available in the kernel keyring subsystem.

===============================
[ INFO: suspicious RCU usage. ]
4.10.0-rc5 #2 Not tainted
-------------------------------
./include/keys/user-type.h:53 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
2 locks held by cryptsetup/6464:
 #0:  (&amp;md-&gt;type_lock){+.+.+.}, at: [&lt;ffffffffa02472a2&gt;] dm_lock_md_type+0x12/0x20 [dm_mod]
 #1:  (rcu_read_lock){......}, at: [&lt;ffffffffa02822f8&gt;] crypt_set_key+0x1d8/0x4b0 [dm_crypt]
stack backtrace:
CPU: 1 PID: 6464 Comm: cryptsetup Not tainted 4.10.0-rc5 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-1.fc24 04/01/2014
Call Trace:
 dump_stack+0x67/0x92
 lockdep_rcu_suspicious+0xc5/0x100
 crypt_set_key+0x351/0x4b0 [dm_crypt]
 ? crypt_set_key+0x1d8/0x4b0 [dm_crypt]
 crypt_ctr+0x341/0xa53 [dm_crypt]
 dm_table_add_target+0x147/0x330 [dm_mod]
 table_load+0x111/0x350 [dm_mod]
 ? retrieve_status+0x1c0/0x1c0 [dm_mod]
 ctl_ioctl+0x1f5/0x510 [dm_mod]
 dm_ctl_ioctl+0xe/0x20 [dm_mod]
 do_vfs_ioctl+0x8e/0x690
 ? ____fput+0x9/0x10
 ? task_work_run+0x7e/0xa0
 ? trace_hardirqs_on_caller+0x122/0x1b0
 SyS_ioctl+0x3c/0x70
 entry_SYSCALL_64_fastpath+0x18/0xad
RIP: 0033:0x7f392c9a4ec7
RSP: 002b:00007ffef6383378 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffef63830a0 RCX: 00007f392c9a4ec7
RDX: 000000000124fcc0 RSI: 00000000c138fd09 RDI: 0000000000000005
RBP: 00007ffef6383090 R08: 00000000ffffffff R09: 00000000012482b0
R10: 2a28205d34383336 R11: 0000000000000246 R12: 00007f392d803a08
R13: 00007ffef63831e0 R14: 0000000000000000 R15: 00007f392d803a0b

Fixes: c538f6ec9f56 ("dm crypt: add ability to use keys from the kernel key retention service")
Reported-by: Milan Broz &lt;mbroz@redhat.com&gt;
Signed-off-by: Ondrej Kozina &lt;okozina@redhat.com&gt;
Reviewed-by: Mikulas Patocka &lt;mpatocka@redhat.com&gt;
Signed-off-by: Mike Snitzer &lt;snitzer@redhat.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=f5b0cba8f23915e92932f11eb063e37d70556a89'>Diffstat</a> (limited to 'drivers/usb/host/xhci-rcar.h')</div><table summary='diffstat' class='diffstat'>