Revision be7635e7287e0e8013af3c89a6354a9e0182594c authored by Alexander Potapenko on 25 March 2016, 21:22:05 UTC, committed by Linus Torvalds on 25 March 2016, 23:37:42 UTC
KASAN needs to know whether the allocation happens in an IRQ handler. This lets us strip everything below the IRQ entry point to reduce the number of unique stack traces needed to be stored. Move the definition of __irq_entry to <linux/interrupt.h> so that the users don't need to pull in <linux/ftrace.h>. Also introduce the __softirq_entry macro which is similar to __irq_entry, but puts the corresponding functions to the .softirqentry.text section. Signed-off-by: Alexander Potapenko <glider@google.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Andrey Konovalov <adech.fo@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Konstantin Serebryany <kcc@google.com> Cc: Dmitry Chernenkov <dmitryc@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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phy-lpc18xx-usb-otg.c
/*
* PHY driver for NXP LPC18xx/43xx internal USB OTG PHY
*
* Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
/* USB OTG PHY register offset and bit in CREG */
#define LPC18XX_CREG_CREG0 0x004
#define LPC18XX_CREG_CREG0_USB0PHY BIT(5)
struct lpc18xx_usb_otg_phy {
struct phy *phy;
struct clk *clk;
struct regmap *reg;
};
static int lpc18xx_usb_otg_phy_init(struct phy *phy)
{
struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
int ret;
/* The PHY must be clocked at 480 MHz */
ret = clk_set_rate(lpc->clk, 480000000);
if (ret)
return ret;
return clk_prepare(lpc->clk);
}
static int lpc18xx_usb_otg_phy_exit(struct phy *phy)
{
struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
clk_unprepare(lpc->clk);
return 0;
}
static int lpc18xx_usb_otg_phy_power_on(struct phy *phy)
{
struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
int ret;
ret = clk_enable(lpc->clk);
if (ret)
return ret;
/* The bit in CREG is cleared to enable the PHY */
return regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0,
LPC18XX_CREG_CREG0_USB0PHY, 0);
}
static int lpc18xx_usb_otg_phy_power_off(struct phy *phy)
{
struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
int ret;
ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0,
LPC18XX_CREG_CREG0_USB0PHY,
LPC18XX_CREG_CREG0_USB0PHY);
if (ret)
return ret;
clk_disable(lpc->clk);
return 0;
}
static const struct phy_ops lpc18xx_usb_otg_phy_ops = {
.init = lpc18xx_usb_otg_phy_init,
.exit = lpc18xx_usb_otg_phy_exit,
.power_on = lpc18xx_usb_otg_phy_power_on,
.power_off = lpc18xx_usb_otg_phy_power_off,
.owner = THIS_MODULE,
};
static int lpc18xx_usb_otg_phy_probe(struct platform_device *pdev)
{
struct phy_provider *phy_provider;
struct lpc18xx_usb_otg_phy *lpc;
lpc = devm_kzalloc(&pdev->dev, sizeof(*lpc), GFP_KERNEL);
if (!lpc)
return -ENOMEM;
lpc->reg = syscon_node_to_regmap(pdev->dev.of_node->parent);
if (IS_ERR(lpc->reg)) {
dev_err(&pdev->dev, "failed to get syscon\n");
return PTR_ERR(lpc->reg);
}
lpc->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(lpc->clk)) {
dev_err(&pdev->dev, "failed to get clock\n");
return PTR_ERR(lpc->clk);
}
lpc->phy = devm_phy_create(&pdev->dev, NULL, &lpc18xx_usb_otg_phy_ops);
if (IS_ERR(lpc->phy)) {
dev_err(&pdev->dev, "failed to create PHY\n");
return PTR_ERR(lpc->phy);
}
phy_set_drvdata(lpc->phy, lpc);
phy_provider = devm_of_phy_provider_register(&pdev->dev,
of_phy_simple_xlate);
return PTR_ERR_OR_ZERO(phy_provider);
}
static const struct of_device_id lpc18xx_usb_otg_phy_match[] = {
{ .compatible = "nxp,lpc1850-usb-otg-phy" },
{ }
};
MODULE_DEVICE_TABLE(of, lpc18xx_usb_otg_phy_match);
static struct platform_driver lpc18xx_usb_otg_phy_driver = {
.probe = lpc18xx_usb_otg_phy_probe,
.driver = {
.name = "lpc18xx-usb-otg-phy",
.of_match_table = lpc18xx_usb_otg_phy_match,
},
};
module_platform_driver(lpc18xx_usb_otg_phy_driver);
MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
MODULE_DESCRIPTION("NXP LPC18xx/43xx USB OTG PHY driver");
MODULE_LICENSE("GPL v2");
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