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:
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *   * Neither the name of The Linux Foundation. nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     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
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

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

__WEAK int platform_is_msm8994()
{
	return 0;
}

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);

	/* set CLAMP_N_EN and stay with disabled USB PHY */
	writel(0x23, QUSB2PHY_PORT_POWERDOWN);

	/* Set HS impedance to 42ohms */
	writel(0xA0, QUSB2PHY_PORT_TUNE1);

	/* Set TX current to 19mA, TX SR and TX bias current to 1, 1 */
	writel(0xA5, QUSB2PHY_PORT_TUNE2);

	/* Increase autocalibration bias circuit settling time
	 * and enable utocalibration  */
	writel(0x81, QUSB2PHY_PORT_TUNE3);

	writel(0x85, QUSB2PHY_PORT_TUNE4);
	/* Wait for tuning params to take effect right before re-enabling power*/
	udelay(10);

	/* Disable the PHY */
	writel(0x23, QUSB2PHY_PORT_POWERDOWN);
	/* Enable ULPI mode */
	if (platform_is_msm8994())
		writel(0x0,  QUSB2PHY_PORT_UTMI_CTRL2);
	/* Enable PHY */
	/* set CLAMP_N_EN and USB PHY is enabled*/
	writel(0x22, QUSB2PHY_PORT_POWERDOWN);
}