402 lines
		
	
	
		
			13 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
			
		
		
	
	
			402 lines
		
	
	
		
			13 KiB
		
	
	
	
		
			C
		
	
	
	
	
	
/*
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 * Samsung SoC USB 1.1/2.0 PHY driver - Exynos 5250 support
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 *
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 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
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 * Author: Kamil Debski <k.debski@samsung.com>
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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 version 2 as
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 * published by the Free Software Foundation.
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 */
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/phy/phy.h>
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#include <linux/regmap.h>
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#include "phy-samsung-usb2.h"
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/* Exynos USB PHY registers */
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#define EXYNOS_5250_REFCLKSEL_CRYSTAL	0x0
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#define EXYNOS_5250_REFCLKSEL_XO	0x1
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#define EXYNOS_5250_REFCLKSEL_CLKCORE	0x2
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#define EXYNOS_5250_FSEL_9MHZ6		0x0
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#define EXYNOS_5250_FSEL_10MHZ		0x1
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#define EXYNOS_5250_FSEL_12MHZ		0x2
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#define EXYNOS_5250_FSEL_19MHZ2		0x3
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#define EXYNOS_5250_FSEL_20MHZ		0x4
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#define EXYNOS_5250_FSEL_24MHZ		0x5
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#define EXYNOS_5250_FSEL_50MHZ		0x7
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/* Normal host */
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#define EXYNOS_5250_HOSTPHYCTRL0			0x0
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#define EXYNOS_5250_HOSTPHYCTRL0_PHYSWRSTALL		BIT(31)
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#define EXYNOS_5250_HOSTPHYCTRL0_REFCLKSEL_SHIFT	19
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#define EXYNOS_5250_HOSTPHYCTRL0_REFCLKSEL_MASK	\
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		(0x3 << EXYNOS_5250_HOSTPHYCTRL0_REFCLKSEL_SHIFT)
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#define EXYNOS_5250_HOSTPHYCTRL0_FSEL_SHIFT		16
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#define EXYNOS_5250_HOSTPHYCTRL0_FSEL_MASK \
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		(0x7 << EXYNOS_5250_HOSTPHYCTRL0_FSEL_SHIFT)
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#define EXYNOS_5250_HOSTPHYCTRL0_TESTBURNIN		BIT(11)
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#define EXYNOS_5250_HOSTPHYCTRL0_RETENABLE		BIT(10)
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#define EXYNOS_5250_HOSTPHYCTRL0_COMMON_ON_N		BIT(9)
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#define EXYNOS_5250_HOSTPHYCTRL0_VATESTENB_MASK		(0x3 << 7)
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#define EXYNOS_5250_HOSTPHYCTRL0_VATESTENB_DUAL		(0x0 << 7)
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#define EXYNOS_5250_HOSTPHYCTRL0_VATESTENB_ID0		(0x1 << 7)
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#define EXYNOS_5250_HOSTPHYCTRL0_VATESTENB_ANALOGTEST	(0x2 << 7)
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#define EXYNOS_5250_HOSTPHYCTRL0_SIDDQ			BIT(6)
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#define EXYNOS_5250_HOSTPHYCTRL0_FORCESLEEP		BIT(5)
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#define EXYNOS_5250_HOSTPHYCTRL0_FORCESUSPEND		BIT(4)
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#define EXYNOS_5250_HOSTPHYCTRL0_WORDINTERFACE		BIT(3)
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#define EXYNOS_5250_HOSTPHYCTRL0_UTMISWRST		BIT(2)
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#define EXYNOS_5250_HOSTPHYCTRL0_LINKSWRST		BIT(1)
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#define EXYNOS_5250_HOSTPHYCTRL0_PHYSWRST		BIT(0)
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/* HSIC0 & HSIC1 */
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#define EXYNOS_5250_HSICPHYCTRL1			0x10
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#define EXYNOS_5250_HSICPHYCTRL2			0x20
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#define EXYNOS_5250_HSICPHYCTRLX_REFCLKSEL_MASK		(0x3 << 23)
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#define EXYNOS_5250_HSICPHYCTRLX_REFCLKSEL_DEFAULT	(0x2 << 23)
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#define EXYNOS_5250_HSICPHYCTRLX_REFCLKDIV_MASK		(0x7f << 16)
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#define EXYNOS_5250_HSICPHYCTRLX_REFCLKDIV_12		(0x24 << 16)
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#define EXYNOS_5250_HSICPHYCTRLX_REFCLKDIV_15		(0x1c << 16)
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#define EXYNOS_5250_HSICPHYCTRLX_REFCLKDIV_16		(0x1a << 16)
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#define EXYNOS_5250_HSICPHYCTRLX_REFCLKDIV_19_2		(0x15 << 16)
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#define EXYNOS_5250_HSICPHYCTRLX_REFCLKDIV_20		(0x14 << 16)
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#define EXYNOS_5250_HSICPHYCTRLX_SIDDQ			BIT(6)
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#define EXYNOS_5250_HSICPHYCTRLX_FORCESLEEP		BIT(5)
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#define EXYNOS_5250_HSICPHYCTRLX_FORCESUSPEND		BIT(4)
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#define EXYNOS_5250_HSICPHYCTRLX_WORDINTERFACE		BIT(3)
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#define EXYNOS_5250_HSICPHYCTRLX_UTMISWRST		BIT(2)
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#define EXYNOS_5250_HSICPHYCTRLX_PHYSWRST		BIT(0)
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/* EHCI control */
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#define EXYNOS_5250_HOSTEHCICTRL			0x30
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#define EXYNOS_5250_HOSTEHCICTRL_ENAINCRXALIGN		BIT(29)
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#define EXYNOS_5250_HOSTEHCICTRL_ENAINCR4		BIT(28)
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#define EXYNOS_5250_HOSTEHCICTRL_ENAINCR8		BIT(27)
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#define EXYNOS_5250_HOSTEHCICTRL_ENAINCR16		BIT(26)
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#define EXYNOS_5250_HOSTEHCICTRL_AUTOPPDONOVRCUREN	BIT(25)
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#define EXYNOS_5250_HOSTEHCICTRL_FLADJVAL0_SHIFT	19
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#define EXYNOS_5250_HOSTEHCICTRL_FLADJVAL0_MASK	\
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		(0x3f << EXYNOS_5250_HOSTEHCICTRL_FLADJVAL0_SHIFT)
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#define EXYNOS_5250_HOSTEHCICTRL_FLADJVAL1_SHIFT	13
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#define EXYNOS_5250_HOSTEHCICTRL_FLADJVAL1_MASK	\
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		(0x3f << EXYNOS_5250_HOSTEHCICTRL_FLADJVAL1_SHIFT)
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#define EXYNOS_5250_HOSTEHCICTRL_FLADJVAL2_SHIFT	7
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#define EXYNOS_5250_HOSTEHCICTRL_FLADJVAL0_MASK	\
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		(0x3f << EXYNOS_5250_HOSTEHCICTRL_FLADJVAL0_SHIFT)
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#define EXYNOS_5250_HOSTEHCICTRL_FLADJVALHOST_SHIFT	1
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#define EXYNOS_5250_HOSTEHCICTRL_FLADJVALHOST_MASK \
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		(0x1 << EXYNOS_5250_HOSTEHCICTRL_FLADJVALHOST_SHIFT)
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#define EXYNOS_5250_HOSTEHCICTRL_SIMULATIONMODE		BIT(0)
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/* OHCI control */
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#define EXYNOS_5250_HOSTOHCICTRL                        0x34
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#define EXYNOS_5250_HOSTOHCICTRL_FRAMELENVAL_SHIFT	1
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#define EXYNOS_5250_HOSTOHCICTRL_FRAMELENVAL_MASK \
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		(0x3ff << EXYNOS_5250_HOSTOHCICTRL_FRAMELENVAL_SHIFT)
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#define EXYNOS_5250_HOSTOHCICTRL_FRAMELENVALEN		BIT(0)
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/* USBOTG */
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#define EXYNOS_5250_USBOTGSYS				0x38
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#define EXYNOS_5250_USBOTGSYS_PHYLINK_SW_RESET		BIT(14)
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#define EXYNOS_5250_USBOTGSYS_LINK_SW_RST_UOTG		BIT(13)
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#define EXYNOS_5250_USBOTGSYS_PHY_SW_RST		BIT(12)
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#define EXYNOS_5250_USBOTGSYS_REFCLKSEL_SHIFT		9
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#define EXYNOS_5250_USBOTGSYS_REFCLKSEL_MASK \
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		(0x3 << EXYNOS_5250_USBOTGSYS_REFCLKSEL_SHIFT)
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#define EXYNOS_5250_USBOTGSYS_ID_PULLUP			BIT(8)
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#define EXYNOS_5250_USBOTGSYS_COMMON_ON			BIT(7)
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#define EXYNOS_5250_USBOTGSYS_FSEL_SHIFT		4
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#define EXYNOS_5250_USBOTGSYS_FSEL_MASK \
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		(0x3 << EXYNOS_5250_USBOTGSYS_FSEL_SHIFT)
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#define EXYNOS_5250_USBOTGSYS_FORCE_SLEEP		BIT(3)
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#define EXYNOS_5250_USBOTGSYS_OTGDISABLE		BIT(2)
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#define EXYNOS_5250_USBOTGSYS_SIDDQ_UOTG		BIT(1)
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#define EXYNOS_5250_USBOTGSYS_FORCE_SUSPEND		BIT(0)
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/* Isolation, configured in the power management unit */
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#define EXYNOS_5250_USB_ISOL_OTG_OFFSET		0x704
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#define EXYNOS_5250_USB_ISOL_OTG		BIT(0)
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#define EXYNOS_5250_USB_ISOL_HOST_OFFSET	0x708
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#define EXYNOS_5250_USB_ISOL_HOST		BIT(0)
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/* Mode swtich register */
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#define EXYNOS_5250_MODE_SWITCH_OFFSET		0x230
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#define EXYNOS_5250_MODE_SWITCH_MASK		1
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#define EXYNOS_5250_MODE_SWITCH_DEVICE		0
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#define EXYNOS_5250_MODE_SWITCH_HOST		1
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enum exynos4x12_phy_id {
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	EXYNOS5250_DEVICE,
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	EXYNOS5250_HOST,
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	EXYNOS5250_HSIC0,
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	EXYNOS5250_HSIC1,
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	EXYNOS5250_NUM_PHYS,
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};
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/*
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 * exynos5250_rate_to_clk() converts the supplied clock rate to the value that
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 * can be written to the phy register.
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 */
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static int exynos5250_rate_to_clk(unsigned long rate, u32 *reg)
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{
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	/* EXYNOS_5250_FSEL_MASK */
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	switch (rate) {
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	case 9600 * KHZ:
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		*reg = EXYNOS_5250_FSEL_9MHZ6;
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		break;
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	case 10 * MHZ:
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		*reg = EXYNOS_5250_FSEL_10MHZ;
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		break;
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	case 12 * MHZ:
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		*reg = EXYNOS_5250_FSEL_12MHZ;
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		break;
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	case 19200 * KHZ:
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		*reg = EXYNOS_5250_FSEL_19MHZ2;
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		break;
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	case 20 * MHZ:
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		*reg = EXYNOS_5250_FSEL_20MHZ;
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		break;
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	case 24 * MHZ:
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		*reg = EXYNOS_5250_FSEL_24MHZ;
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		break;
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	case 50 * MHZ:
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		*reg = EXYNOS_5250_FSEL_50MHZ;
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		break;
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	default:
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		return -EINVAL;
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	}
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	return 0;
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}
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static void exynos5250_isol(struct samsung_usb2_phy_instance *inst, bool on)
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{
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	struct samsung_usb2_phy_driver *drv = inst->drv;
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	u32 offset;
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	u32 mask;
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	switch (inst->cfg->id) {
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	case EXYNOS5250_DEVICE:
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		offset = EXYNOS_5250_USB_ISOL_OTG_OFFSET;
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		mask = EXYNOS_5250_USB_ISOL_OTG;
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		break;
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	case EXYNOS5250_HOST:
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		offset = EXYNOS_5250_USB_ISOL_HOST_OFFSET;
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		mask = EXYNOS_5250_USB_ISOL_HOST;
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		break;
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	default:
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		return;
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	}
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	regmap_update_bits(drv->reg_pmu, offset, mask, on ? 0 : mask);
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}
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static int exynos5250_power_on(struct samsung_usb2_phy_instance *inst)
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{
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	struct samsung_usb2_phy_driver *drv = inst->drv;
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	u32 ctrl0;
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	u32 otg;
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	u32 ehci;
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	u32 ohci;
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	u32 hsic;
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	switch (inst->cfg->id) {
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	case EXYNOS5250_DEVICE:
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		regmap_update_bits(drv->reg_sys,
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				   EXYNOS_5250_MODE_SWITCH_OFFSET,
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				   EXYNOS_5250_MODE_SWITCH_MASK,
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				   EXYNOS_5250_MODE_SWITCH_DEVICE);
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		/* OTG configuration */
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		otg = readl(drv->reg_phy + EXYNOS_5250_USBOTGSYS);
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		/* The clock */
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		otg &= ~EXYNOS_5250_USBOTGSYS_FSEL_MASK;
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		otg |= drv->ref_reg_val << EXYNOS_5250_USBOTGSYS_FSEL_SHIFT;
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		/* Reset */
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		otg &= ~(EXYNOS_5250_USBOTGSYS_FORCE_SUSPEND |
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			EXYNOS_5250_USBOTGSYS_FORCE_SLEEP |
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			EXYNOS_5250_USBOTGSYS_SIDDQ_UOTG);
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		otg |=	EXYNOS_5250_USBOTGSYS_PHY_SW_RST |
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			EXYNOS_5250_USBOTGSYS_PHYLINK_SW_RESET |
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			EXYNOS_5250_USBOTGSYS_LINK_SW_RST_UOTG |
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			EXYNOS_5250_USBOTGSYS_OTGDISABLE;
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		/* Ref clock */
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		otg &=	~EXYNOS_5250_USBOTGSYS_REFCLKSEL_MASK;
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		otg |=  EXYNOS_5250_REFCLKSEL_CLKCORE <<
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					EXYNOS_5250_USBOTGSYS_REFCLKSEL_SHIFT;
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		writel(otg, drv->reg_phy + EXYNOS_5250_USBOTGSYS);
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		udelay(100);
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		otg &= ~(EXYNOS_5250_USBOTGSYS_PHY_SW_RST |
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			EXYNOS_5250_USBOTGSYS_LINK_SW_RST_UOTG |
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			EXYNOS_5250_USBOTGSYS_PHYLINK_SW_RESET |
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			EXYNOS_5250_USBOTGSYS_OTGDISABLE);
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		writel(otg, drv->reg_phy + EXYNOS_5250_USBOTGSYS);
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		break;
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	case EXYNOS5250_HOST:
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	case EXYNOS5250_HSIC0:
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	case EXYNOS5250_HSIC1:
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		/* Host registers configuration */
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		ctrl0 = readl(drv->reg_phy + EXYNOS_5250_HOSTPHYCTRL0);
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		/* The clock */
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		ctrl0 &= ~EXYNOS_5250_HOSTPHYCTRL0_FSEL_MASK;
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		ctrl0 |= drv->ref_reg_val <<
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					EXYNOS_5250_HOSTPHYCTRL0_FSEL_SHIFT;
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		/* Reset */
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		ctrl0 &=	~(EXYNOS_5250_HOSTPHYCTRL0_PHYSWRST |
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				EXYNOS_5250_HOSTPHYCTRL0_PHYSWRSTALL |
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				EXYNOS_5250_HOSTPHYCTRL0_SIDDQ |
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				EXYNOS_5250_HOSTPHYCTRL0_FORCESUSPEND |
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				EXYNOS_5250_HOSTPHYCTRL0_FORCESLEEP);
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		ctrl0 |=	EXYNOS_5250_HOSTPHYCTRL0_LINKSWRST |
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				EXYNOS_5250_HOSTPHYCTRL0_UTMISWRST |
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				EXYNOS_5250_HOSTPHYCTRL0_COMMON_ON_N;
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		writel(ctrl0, drv->reg_phy + EXYNOS_5250_HOSTPHYCTRL0);
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		udelay(10);
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		ctrl0 &=	~(EXYNOS_5250_HOSTPHYCTRL0_LINKSWRST |
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				EXYNOS_5250_HOSTPHYCTRL0_UTMISWRST);
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		writel(ctrl0, drv->reg_phy + EXYNOS_5250_HOSTPHYCTRL0);
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		/* OTG configuration */
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		otg = readl(drv->reg_phy + EXYNOS_5250_USBOTGSYS);
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		/* The clock */
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		otg &= ~EXYNOS_5250_USBOTGSYS_FSEL_MASK;
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		otg |= drv->ref_reg_val << EXYNOS_5250_USBOTGSYS_FSEL_SHIFT;
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		/* Reset */
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		otg &= ~(EXYNOS_5250_USBOTGSYS_FORCE_SUSPEND |
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			EXYNOS_5250_USBOTGSYS_FORCE_SLEEP |
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			EXYNOS_5250_USBOTGSYS_SIDDQ_UOTG);
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		otg |=	EXYNOS_5250_USBOTGSYS_PHY_SW_RST |
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			EXYNOS_5250_USBOTGSYS_PHYLINK_SW_RESET |
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			EXYNOS_5250_USBOTGSYS_LINK_SW_RST_UOTG |
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			EXYNOS_5250_USBOTGSYS_OTGDISABLE;
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		/* Ref clock */
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		otg &=	~EXYNOS_5250_USBOTGSYS_REFCLKSEL_MASK;
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		otg |=  EXYNOS_5250_REFCLKSEL_CLKCORE <<
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					EXYNOS_5250_USBOTGSYS_REFCLKSEL_SHIFT;
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		writel(otg, drv->reg_phy + EXYNOS_5250_USBOTGSYS);
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		udelay(10);
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		otg &= ~(EXYNOS_5250_USBOTGSYS_PHY_SW_RST |
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			EXYNOS_5250_USBOTGSYS_LINK_SW_RST_UOTG |
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			EXYNOS_5250_USBOTGSYS_PHYLINK_SW_RESET);
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		/* HSIC phy configuration */
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		hsic = (EXYNOS_5250_HSICPHYCTRLX_REFCLKDIV_12 |
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				EXYNOS_5250_HSICPHYCTRLX_REFCLKSEL_DEFAULT |
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				EXYNOS_5250_HSICPHYCTRLX_PHYSWRST);
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		writel(hsic, drv->reg_phy + EXYNOS_5250_HSICPHYCTRL1);
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		writel(hsic, drv->reg_phy + EXYNOS_5250_HSICPHYCTRL2);
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		udelay(10);
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		hsic &= ~EXYNOS_5250_HSICPHYCTRLX_PHYSWRST;
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		writel(hsic, drv->reg_phy + EXYNOS_5250_HSICPHYCTRL1);
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		writel(hsic, drv->reg_phy + EXYNOS_5250_HSICPHYCTRL2);
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		/* The following delay is necessary for the reset sequence to be
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		 * completed */
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		udelay(80);
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		/* Enable EHCI DMA burst */
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		ehci = readl(drv->reg_phy + EXYNOS_5250_HOSTEHCICTRL);
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		ehci |=	EXYNOS_5250_HOSTEHCICTRL_ENAINCRXALIGN |
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			EXYNOS_5250_HOSTEHCICTRL_ENAINCR4 |
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			EXYNOS_5250_HOSTEHCICTRL_ENAINCR8 |
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			EXYNOS_5250_HOSTEHCICTRL_ENAINCR16;
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		writel(ehci, drv->reg_phy + EXYNOS_5250_HOSTEHCICTRL);
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		/* OHCI settings */
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		ohci = readl(drv->reg_phy + EXYNOS_5250_HOSTOHCICTRL);
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		/* Following code is based on the old driver */
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		ohci |=	0x1 << 3;
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		writel(ohci, drv->reg_phy + EXYNOS_5250_HOSTOHCICTRL);
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						|
 | 
						|
		break;
 | 
						|
	}
 | 
						|
	exynos5250_isol(inst, 0);
 | 
						|
 | 
						|
	return 0;
 | 
						|
}
 | 
						|
 | 
						|
static int exynos5250_power_off(struct samsung_usb2_phy_instance *inst)
 | 
						|
{
 | 
						|
	struct samsung_usb2_phy_driver *drv = inst->drv;
 | 
						|
	u32 ctrl0;
 | 
						|
	u32 otg;
 | 
						|
	u32 hsic;
 | 
						|
 | 
						|
	exynos5250_isol(inst, 1);
 | 
						|
 | 
						|
	switch (inst->cfg->id) {
 | 
						|
	case EXYNOS5250_DEVICE:
 | 
						|
		otg = readl(drv->reg_phy + EXYNOS_5250_USBOTGSYS);
 | 
						|
		otg |= (EXYNOS_5250_USBOTGSYS_FORCE_SUSPEND |
 | 
						|
			EXYNOS_5250_USBOTGSYS_SIDDQ_UOTG |
 | 
						|
			EXYNOS_5250_USBOTGSYS_FORCE_SLEEP);
 | 
						|
		writel(otg, drv->reg_phy + EXYNOS_5250_USBOTGSYS);
 | 
						|
		break;
 | 
						|
	case EXYNOS5250_HOST:
 | 
						|
		ctrl0 = readl(drv->reg_phy + EXYNOS_5250_HOSTPHYCTRL0);
 | 
						|
		ctrl0 |= (EXYNOS_5250_HOSTPHYCTRL0_SIDDQ |
 | 
						|
				EXYNOS_5250_HOSTPHYCTRL0_FORCESUSPEND |
 | 
						|
				EXYNOS_5250_HOSTPHYCTRL0_FORCESLEEP |
 | 
						|
				EXYNOS_5250_HOSTPHYCTRL0_PHYSWRST |
 | 
						|
				EXYNOS_5250_HOSTPHYCTRL0_PHYSWRSTALL);
 | 
						|
		writel(ctrl0, drv->reg_phy + EXYNOS_5250_HOSTPHYCTRL0);
 | 
						|
		break;
 | 
						|
	case EXYNOS5250_HSIC0:
 | 
						|
	case EXYNOS5250_HSIC1:
 | 
						|
		hsic = (EXYNOS_5250_HSICPHYCTRLX_REFCLKDIV_12 |
 | 
						|
				EXYNOS_5250_HSICPHYCTRLX_REFCLKSEL_DEFAULT |
 | 
						|
				EXYNOS_5250_HSICPHYCTRLX_SIDDQ |
 | 
						|
				EXYNOS_5250_HSICPHYCTRLX_FORCESLEEP |
 | 
						|
				EXYNOS_5250_HSICPHYCTRLX_FORCESUSPEND
 | 
						|
				);
 | 
						|
		writel(hsic, drv->reg_phy + EXYNOS_5250_HSICPHYCTRL1);
 | 
						|
		writel(hsic, drv->reg_phy + EXYNOS_5250_HSICPHYCTRL2);
 | 
						|
		break;
 | 
						|
	}
 | 
						|
 | 
						|
	return 0;
 | 
						|
}
 | 
						|
 | 
						|
 | 
						|
static const struct samsung_usb2_common_phy exynos5250_phys[] = {
 | 
						|
	{
 | 
						|
		.label		= "device",
 | 
						|
		.id		= EXYNOS5250_DEVICE,
 | 
						|
		.power_on	= exynos5250_power_on,
 | 
						|
		.power_off	= exynos5250_power_off,
 | 
						|
	},
 | 
						|
	{
 | 
						|
		.label		= "host",
 | 
						|
		.id		= EXYNOS5250_HOST,
 | 
						|
		.power_on	= exynos5250_power_on,
 | 
						|
		.power_off	= exynos5250_power_off,
 | 
						|
	},
 | 
						|
	{
 | 
						|
		.label		= "hsic0",
 | 
						|
		.id		= EXYNOS5250_HSIC0,
 | 
						|
		.power_on	= exynos5250_power_on,
 | 
						|
		.power_off	= exynos5250_power_off,
 | 
						|
	},
 | 
						|
	{
 | 
						|
		.label		= "hsic1",
 | 
						|
		.id		= EXYNOS5250_HSIC1,
 | 
						|
		.power_on	= exynos5250_power_on,
 | 
						|
		.power_off	= exynos5250_power_off,
 | 
						|
	},
 | 
						|
};
 | 
						|
 | 
						|
const struct samsung_usb2_phy_config exynos5250_usb2_phy_config = {
 | 
						|
	.has_mode_switch	= 1,
 | 
						|
	.num_phys		= EXYNOS5250_NUM_PHYS,
 | 
						|
	.phys			= exynos5250_phys,
 | 
						|
	.rate_to_clk		= exynos5250_rate_to_clk,
 | 
						|
};
 |