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/*
* i.MX23 USBPHY setup
*
* Copyright 2011 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
*
* 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.
*
* 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 <common.h>
#include <io.h>
#include <mach/imx-regs.h>
#include <mach/power.h>
#define USBPHY_PWD (IMX_USBPHY_BASE + 0x0)
#define USBPHY_CTRL (IMX_USBPHY_BASE + 0x30)
#define USBPHY_CTRL_SFTRST 0x80000000
#define USBPHY_CTRL_CLKGATE 0x40000000
#define CLK_PLLCTRL0 (IMX_CCM_BASE + 0x0)
#define PLLCTRL0_EN_USB_CLKS 0x00040000
#define DIGCTRL_CTRL (IMX_DIGCTL_BASE + 0x0)
#define DIGCTL_CTRL_USB_CLKGATE 0x00000004
#define SET 0x4
#define CLR 0x8
int imx23_usb_phy_enable(void)
{
imx_power_prepare_usbphy();
/* Reset USBPHY module */
writel(USBPHY_CTRL_SFTRST, USBPHY_CTRL + SET);
udelay(10);
/* Remove CLKGATE and SFTRST */
writel(USBPHY_CTRL_CLKGATE | USBPHY_CTRL_SFTRST, USBPHY_CTRL + CLR);
/* Turn on the USB clocks */
writel(PLLCTRL0_EN_USB_CLKS, CLK_PLLCTRL0 + SET);
writel(DIGCTL_CTRL_USB_CLKGATE, DIGCTRL_CTRL + CLR);
/* Power up the PHY */
writel(0, USBPHY_PWD);
/*
* Set precharge bit to cure overshoot problems at the
* start of packets
*/
writel(1, USBPHY_CTRL + SET);
return 0;
}
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