platform/msm_shared/qusb2_phy.c

/* Copyright (c) 2014, The Linux Foundation. All rights reserved.

 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
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 *     notice, this list of conditions and the following disclaimer.
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 *     with the distribution.
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 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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 */

#include <platform/iomap.h>
#include <reg.h>
#include <bits.h>
#include <debug.h>

void qusb2_phy_reset(void)
{
	uint32_t val;

	/* Block Reset */
	val = readl(GCC_QUSB2_PHY_BCR) | BIT(0);
	writel(val, GCC_QUSB2_PHY_BCR);
	udelay(10);
	writel(val & ~BIT(0), GCC_QUSB2_PHY_BCR);

	/* Deassert POWERDOWN by clearing bit 0 to enable the PHY */
	val = readl(QUSB2PHY_PORT_POWERDOWN);
	writel(val & ~BIT(0), QUSB2PHY_PORT_POWERDOWN);
	udelay(10);

	/* set CLAMP_N_EN and FREEZIO_N */
	writel(0x22, QUSB2PHY_PORT_POWERDOWN);
}