cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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phy-omap-otg.c (3796B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * OMAP OTG controller driver
      4 *
      5 * Based on code from tahvo-usb.c and isp1301_omap.c drivers.
      6 *
      7 * Copyright (C) 2005-2006 Nokia Corporation
      8 * Copyright (C) 2004 Texas Instruments
      9 * Copyright (C) 2004 David Brownell
     10 */
     11
     12#include <linux/io.h>
     13#include <linux/err.h>
     14#include <linux/extcon.h>
     15#include <linux/kernel.h>
     16#include <linux/module.h>
     17#include <linux/interrupt.h>
     18#include <linux/platform_device.h>
     19#include <linux/platform_data/usb-omap1.h>
     20
     21struct otg_device {
     22	void __iomem			*base;
     23	bool				id;
     24	bool				vbus;
     25	struct extcon_dev		*extcon;
     26	struct notifier_block		vbus_nb;
     27	struct notifier_block		id_nb;
     28};
     29
     30#define OMAP_OTG_CTRL		0x0c
     31#define OMAP_OTG_ASESSVLD	(1 << 20)
     32#define OMAP_OTG_BSESSEND	(1 << 19)
     33#define OMAP_OTG_BSESSVLD	(1 << 18)
     34#define OMAP_OTG_VBUSVLD	(1 << 17)
     35#define OMAP_OTG_ID		(1 << 16)
     36#define OMAP_OTG_XCEIV_OUTPUTS \
     37	(OMAP_OTG_ASESSVLD | OMAP_OTG_BSESSEND | OMAP_OTG_BSESSVLD | \
     38	 OMAP_OTG_VBUSVLD  | OMAP_OTG_ID)
     39
     40static void omap_otg_ctrl(struct otg_device *otg_dev, u32 outputs)
     41{
     42	u32 l;
     43
     44	l = readl(otg_dev->base + OMAP_OTG_CTRL);
     45	l &= ~OMAP_OTG_XCEIV_OUTPUTS;
     46	l |= outputs;
     47	writel(l, otg_dev->base + OMAP_OTG_CTRL);
     48}
     49
     50static void omap_otg_set_mode(struct otg_device *otg_dev)
     51{
     52	if (!otg_dev->id && otg_dev->vbus)
     53		/* Set B-session valid. */
     54		omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSVLD);
     55	else if (otg_dev->vbus)
     56		/* Set A-session valid. */
     57		omap_otg_ctrl(otg_dev, OMAP_OTG_ASESSVLD);
     58	else if (!otg_dev->id)
     59		/* Set B-session end to indicate no VBUS. */
     60		omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSEND);
     61}
     62
     63static int omap_otg_id_notifier(struct notifier_block *nb,
     64				unsigned long event, void *ptr)
     65{
     66	struct otg_device *otg_dev = container_of(nb, struct otg_device, id_nb);
     67
     68	otg_dev->id = event;
     69	omap_otg_set_mode(otg_dev);
     70
     71	return NOTIFY_DONE;
     72}
     73
     74static int omap_otg_vbus_notifier(struct notifier_block *nb,
     75				  unsigned long event, void *ptr)
     76{
     77	struct otg_device *otg_dev = container_of(nb, struct otg_device,
     78						  vbus_nb);
     79
     80	otg_dev->vbus = event;
     81	omap_otg_set_mode(otg_dev);
     82
     83	return NOTIFY_DONE;
     84}
     85
     86static int omap_otg_probe(struct platform_device *pdev)
     87{
     88	const struct omap_usb_config *config = pdev->dev.platform_data;
     89	struct otg_device *otg_dev;
     90	struct extcon_dev *extcon;
     91	int ret;
     92	u32 rev;
     93
     94	if (!config || !config->extcon)
     95		return -ENODEV;
     96
     97	extcon = extcon_get_extcon_dev(config->extcon);
     98	if (IS_ERR(extcon))
     99		return PTR_ERR(extcon);
    100
    101	otg_dev = devm_kzalloc(&pdev->dev, sizeof(*otg_dev), GFP_KERNEL);
    102	if (!otg_dev)
    103		return -ENOMEM;
    104
    105	otg_dev->base = devm_ioremap_resource(&pdev->dev, &pdev->resource[0]);
    106	if (IS_ERR(otg_dev->base))
    107		return PTR_ERR(otg_dev->base);
    108
    109	otg_dev->extcon = extcon;
    110	otg_dev->id_nb.notifier_call = omap_otg_id_notifier;
    111	otg_dev->vbus_nb.notifier_call = omap_otg_vbus_notifier;
    112
    113	ret = devm_extcon_register_notifier(&pdev->dev, extcon,
    114					EXTCON_USB_HOST, &otg_dev->id_nb);
    115	if (ret)
    116		return ret;
    117
    118	ret = devm_extcon_register_notifier(&pdev->dev, extcon,
    119					EXTCON_USB, &otg_dev->vbus_nb);
    120	if (ret) {
    121		return ret;
    122	}
    123
    124	otg_dev->id = extcon_get_state(extcon, EXTCON_USB_HOST);
    125	otg_dev->vbus = extcon_get_state(extcon, EXTCON_USB);
    126	omap_otg_set_mode(otg_dev);
    127
    128	rev = readl(otg_dev->base);
    129
    130	dev_info(&pdev->dev,
    131		 "OMAP USB OTG controller rev %d.%d (%s, id=%d, vbus=%d)\n",
    132		 (rev >> 4) & 0xf, rev & 0xf, config->extcon, otg_dev->id,
    133		 otg_dev->vbus);
    134
    135	platform_set_drvdata(pdev, otg_dev);
    136
    137	return 0;
    138}
    139
    140static struct platform_driver omap_otg_driver = {
    141	.probe		= omap_otg_probe,
    142	.driver		= {
    143		.name	= "omap_otg",
    144	},
    145};
    146module_platform_driver(omap_otg_driver);
    147
    148MODULE_DESCRIPTION("OMAP USB OTG controller driver");
    149MODULE_LICENSE("GPL");
    150MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");