62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/*
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* i.MX23 USBPHY setup
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*
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* Copyright 2011 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <common.h>
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#include <io.h>
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#include <mach/imx-regs.h>
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#include <mach/power.h>
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#define USBPHY_PWD (IMX_USBPHY_BASE + 0x0)
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#define USBPHY_CTRL (IMX_USBPHY_BASE + 0x30)
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#define USBPHY_CTRL_SFTRST 0x80000000
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#define USBPHY_CTRL_CLKGATE 0x40000000
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#define CLK_PLLCTRL0 (IMX_CCM_BASE + 0x0)
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#define PLLCTRL0_EN_USB_CLKS 0x00040000
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#define DIGCTRL_CTRL (IMX_DIGCTL_BASE + 0x0)
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#define DIGCTL_CTRL_USB_CLKGATE 0x00000004
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#define SET 0x4
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#define CLR 0x8
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int imx23_usb_phy_enable(void)
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{
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imx_power_prepare_usbphy();
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/* Reset USBPHY module */
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writel(USBPHY_CTRL_SFTRST, USBPHY_CTRL + SET);
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udelay(10);
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/* Remove CLKGATE and SFTRST */
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writel(USBPHY_CTRL_CLKGATE | USBPHY_CTRL_SFTRST, USBPHY_CTRL + CLR);
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/* Turn on the USB clocks */
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writel(PLLCTRL0_EN_USB_CLKS, CLK_PLLCTRL0 + SET);
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writel(DIGCTL_CTRL_USB_CLKGATE, DIGCTRL_CTRL + CLR);
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/* Power up the PHY */
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writel(0, USBPHY_PWD);
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/*
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* Set precharge bit to cure overshoot problems at the
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* start of packets
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*/
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writel(1, USBPHY_CTRL + SET);
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return 0;
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}
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