path: root/arch/arm/mach-mvf/usb_dr2.c

/*
 * Copyright 2012 Freescale Semiconductor, Inc.
 *
 * 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.

 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/pm_wakeup.h>
#include <linux/fsl_devices.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <mach/arc_otg.h>
#include <mach/hardware.h>
#include <mach/clock.h>
#include "devices-mvf.h"
#include "crm_regs.h"
#include "regs-anadig.h"
#include "usb.h"

static int usbotg2_init_ext(struct platform_device *pdev);
static void usbotg2_uninit_ext(struct platform_device *pdev);
static void usbotg_clock_gate(bool on);
static void _dr_discharge_line(bool enable);
static void usbotg_wakeup_event_clear(void);

static struct clk *usb_phy1_clk;
static u8 otg2_used;

/* Beginning of Common operation for DR port */

/*
 * platform data structs
 * - Which one to use is determined by CONFIG options in usb.h
 * - operating_mode plugged at run time
 */
static struct fsl_usb2_platform_data dr_utmi_config = {
	.name              = "DR",
	.init              = usbotg2_init_ext,
	.exit              = usbotg2_uninit_ext,
	.phy_mode          = FSL_USB2_PHY_UTMI_WIDE,
	.power_budget      = 500,		/* 500 mA max power */
	.usb_clock_for_pm  = usbotg_clock_gate,
	.transceiver       = "utmi",
	.phy_regs = MVF_USBPHY1_BASE_ADDR,
	.dr_discharge_line = _dr_discharge_line,
};

/* Platform data for wakeup operation */
static struct fsl_usb2_wakeup_platform_data dr_wakeup_config = {
	.name = "Host wakeup",
	.usb_clock_for_pm  = usbotg_clock_gate,
	.usb_wakeup_exhandle = usbotg_wakeup_event_clear,
};

static void usbotg_internal_phy_clock_gate(bool on)
{
	void __iomem *phy_reg = MVF_IO_ADDRESS(MVF_USBPHY1_BASE_ADDR);

	if (on)
		__raw_writel(BM_USBPHY_CTRL_CLKGATE,
				phy_reg + HW_USBPHY_CTRL_CLR);
	else
		__raw_writel(BM_USBPHY_CTRL_CLKGATE,
				phy_reg + HW_USBPHY_CTRL_SET);

}

static int usb_phy_enable(struct fsl_usb2_platform_data *pdata)
{
	u32 tmp;
	void __iomem *phy_reg = MVF_IO_ADDRESS(MVF_USBPHY1_BASE_ADDR);
	void __iomem *phy_ctrl;
	void __iomem *phy_param;

	/* Stop then Reset */
	UOG2_USBCMD &= ~UCMD_RUN_STOP;
	while (UOG2_USBCMD & UCMD_RUN_STOP)
		;

	UOG2_USBCMD |= UCMD_RESET;
	while ((UOG2_USBCMD) & (UCMD_RESET))
		;
	/* Reset USBPHY module */
	phy_ctrl = phy_reg + HW_USBPHY_CTRL;
	tmp = __raw_readl(phy_ctrl);
	tmp |= BM_USBPHY_CTRL_SFTRST;
	__raw_writel(tmp, phy_ctrl);
	udelay(10);

	/* Remove CLKGATE and SFTRST */
	tmp = __raw_readl(phy_ctrl);
	tmp &= ~(BM_USBPHY_CTRL_CLKGATE | BM_USBPHY_CTRL_SFTRST);
	__raw_writel(tmp, phy_ctrl);
	udelay(10);

	/* Power up the PHY */
	__raw_writel(0, phy_reg + HW_USBPHY_PWD);
	if ((pdata->operating_mode == FSL_USB2_DR_HOST) ||
			(pdata->operating_mode == FSL_USB2_DR_OTG)) {
		/* enable FS/LS device */
		__raw_writel(
		BM_USBPHY_CTRL_ENUTMILEVEL2 | BM_USBPHY_CTRL_ENUTMILEVEL3,
				phy_reg + HW_USBPHY_CTRL_SET);
	}

	/*
	 * For USB Certification
	 * TX: set edge rate to max, increase the amplitude
	 * with 2 steps (Level = ~ 437 mV).
	 * RX: reduce transmission envelope detector level with about 20 mV
	 */
	phy_param = phy_reg + HW_USBPHY_TX;
	__raw_writel(0x1c060605, phy_param);
	phy_param = phy_reg + HW_USBPHY_RX;
	__raw_writel(0x1, phy_param);

	return 0;
}
/* Notes: configure USB clock*/
static int usbotg2_init_ext(struct platform_device *pdev)
{
	struct clk *usb_clk;
	u32 ret;

	usb_clk = clk_get(NULL, "mvf-usb.1");
	clk_enable(usb_clk);
	usb_phy1_clk = usb_clk;

	ret = usbotg2_init(pdev);
	if (ret) {
		printk(KERN_ERR "otg init fails......\n");
		return ret;
	}
	if (!otg2_used) {
		usbotg_internal_phy_clock_gate(true);
		usb_phy_enable(pdev->dev.platform_data);
		/*
		 * after the phy reset,can't read the value for id/vbus at
		 * the register of otgsc at once ,need delay 3 ms
		 */
		mdelay(3);
	}
	otg2_used++;

	return ret;
}

static void usbotg2_uninit_ext(struct platform_device *pdev)
{
	struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;

	clk_disable(usb_phy1_clk);
	clk_put(usb_phy1_clk);

	usbotg2_uninit(pdata);
	otg2_used--;
}

static void usbotg_clock_gate(bool on)
{

	if (on)
		clk_enable(usb_phy1_clk);
	else
		clk_disable(usb_phy1_clk);

}

static void _dr_discharge_line(bool enable)
{
	void __iomem *phy_reg = MVF_IO_ADDRESS(MVF_USBPHY1_BASE_ADDR);

	if (enable) {
		__raw_writel(BF_USBPHY_DEBUG_ENHSTPULLDOWN(0x3),
				phy_reg + HW_USBPHY_DEBUG_SET);
		__raw_writel(BF_USBPHY_DEBUG_HSTPULLDOWN(0x3),
				phy_reg + HW_USBPHY_DEBUG_SET);
	} else {
		__raw_writel(BF_USBPHY_DEBUG_ENHSTPULLDOWN(0x3),
				phy_reg + HW_USBPHY_DEBUG_CLR);
		__raw_writel(BF_USBPHY_DEBUG_HSTPULLDOWN(0x3),
				phy_reg + HW_USBPHY_DEBUG_CLR);
	}

}

/* Below two macros are used at otg mode to indicate usb mode*/
#define ENABLED_BY_HOST   (0x1 << 0)
#define ENABLED_BY_DEVICE (0x1 << 1)
static void enter_phy_lowpower_suspend(struct fsl_usb2_platform_data *pdata,
					bool enable)
{
	void __iomem *phy_reg = MVF_IO_ADDRESS(MVF_USBPHY1_BASE_ADDR);
	u32 tmp;
	pr_debug("DR: %s begins, enable is %d\n", __func__, enable);

	if (enable) {
		UOG2_PORTSC1 |= PORTSC_PHCD;
		tmp = (BM_USBPHY_PWD_TXPWDFS
			| BM_USBPHY_PWD_TXPWDIBIAS
			| BM_USBPHY_PWD_TXPWDV2I
			| BM_USBPHY_PWD_RXPWDENV
			| BM_USBPHY_PWD_RXPWD1PT1
			| BM_USBPHY_PWD_RXPWDDIFF
			| BM_USBPHY_PWD_RXPWDRX);
		__raw_writel(tmp, phy_reg + HW_USBPHY_PWD_SET);
		usbotg_internal_phy_clock_gate(false);

	} else {
		if (UOG2_PORTSC1 & PORTSC_PHCD) {
			UOG2_PORTSC1 &= ~PORTSC_PHCD;
			mdelay(1);
		}
		usbotg_internal_phy_clock_gate(true);
		tmp = (BM_USBPHY_PWD_TXPWDFS
			| BM_USBPHY_PWD_TXPWDIBIAS
			| BM_USBPHY_PWD_TXPWDV2I
			| BM_USBPHY_PWD_RXPWDENV
			| BM_USBPHY_PWD_RXPWD1PT1
			| BM_USBPHY_PWD_RXPWDDIFF
			| BM_USBPHY_PWD_RXPWDRX);
		__raw_writel(tmp, phy_reg + HW_USBPHY_PWD_CLR);

	}
	pr_debug("DR: %s ends, enable is %d\n", __func__, enable);
}

static void __phy_lowpower_suspend(struct fsl_usb2_platform_data *pdata,
					bool enable, int source)
{
	if (enable)
		enter_phy_lowpower_suspend(pdata, enable);
	else {
		pr_debug("phy lowpower disable\n");
		enter_phy_lowpower_suspend(pdata, enable);
	}
}

static void otg_wake_up_enable(struct fsl_usb2_platform_data *pdata,
				bool enable)
{
	void __iomem *phy_reg = MVF_IO_ADDRESS(MVF_USBPHY1_BASE_ADDR);

	pr_debug("%s, enable is %d\n", __func__, enable);
	if (enable) {
		__raw_writel(BM_USBPHY_CTRL_ENIDCHG_WKUP
				| BM_USBPHY_CTRL_ENVBUSCHG_WKUP
				| BM_USBPHY_CTRL_ENDPDMCHG_WKUP
				| BM_USBPHY_CTRL_ENAUTOSET_USBCLKS
				| BM_USBPHY_CTRL_ENAUTOCLR_PHY_PWD
				| BM_USBPHY_CTRL_ENAUTOCLR_CLKGATE
				| BM_USBPHY_CTRL_ENAUTOCLR_USBCLKGATE
				| BM_USBPHY_CTRL_ENAUTO_PWRON_PLL,
				phy_reg + HW_USBPHY_CTRL_SET);
		USBC1_CTRL |= UCTRL_OWIE;
	} else {
		USBC1_CTRL &= ~UCTRL_OWIE;
		/* The interrupt must be disabled for at least 3 clock
		 * cycles of the standby clock(32k Hz) , that is 0.094 ms*/
		udelay(100);
	}
}

static void __wakeup_irq_enable(struct fsl_usb2_platform_data *pdata,
				bool on, int source)
{
	pr_debug("USB Host %s,on=%d\n", __func__, on);
	mdelay(3);
	if (on) {
		otg_wake_up_enable(pdata, on);
	} else {
		otg_wake_up_enable(pdata, on);
		/* The interrupt must be disabled for at least 3 clock
		 * cycles of the standby clock(32k Hz) , that is 0.094 ms*/
		udelay(100);
	}
}

/* The wakeup operation for DR port, it will clear the wakeup irq status
 * and re-enable the wakeup
 */
static void usbotg_wakeup_event_clear(void)
{
	int wakeup_req = USBC1_CTRL & UCTRL_OWIR;

	if (wakeup_req != 0) {
		pr_debug("Unknown wakeup.(OTGSC 0x%x)\n", UOG_OTGSC);
		/* Disable OWIE to clear OWIR, wait 3 clock
		 * cycles of standly clock(32KHz)
		 */
		USBC1_CTRL &= ~UCTRL_OWIE;
		udelay(100);
		USBC1_CTRL |= UCTRL_OWIE;
	}
}

/* End of Common operation for DR port */

#ifdef CONFIG_USB_EHCI_ARC_OTG
/* Beginning of host related operation for DR port */
static void _host_platform_suspend(struct fsl_usb2_platform_data *pdata)
{
	void __iomem *phy_reg = MVF_IO_ADDRESS(MVF_USBPHY1_BASE_ADDR);
	u32 tmp;

	tmp = (BM_USBPHY_PWD_TXPWDFS
		| BM_USBPHY_PWD_TXPWDIBIAS
		| BM_USBPHY_PWD_TXPWDV2I
		| BM_USBPHY_PWD_RXPWDENV
		| BM_USBPHY_PWD_RXPWD1PT1
		| BM_USBPHY_PWD_RXPWDDIFF
		| BM_USBPHY_PWD_RXPWDRX);
	__raw_writel(tmp, phy_reg + HW_USBPHY_PWD_SET);
}

static void _host_platform_resume(struct fsl_usb2_platform_data *pdata)
{
	void __iomem *phy_reg = MVF_IO_ADDRESS(MVF_USBPHY1_BASE_ADDR);
	u32 tmp;

	tmp = (BM_USBPHY_PWD_TXPWDFS
		| BM_USBPHY_PWD_TXPWDIBIAS
		| BM_USBPHY_PWD_TXPWDV2I
		| BM_USBPHY_PWD_RXPWDENV
		| BM_USBPHY_PWD_RXPWD1PT1
		| BM_USBPHY_PWD_RXPWDDIFF
		| BM_USBPHY_PWD_RXPWDRX);
	__raw_writel(tmp, phy_reg + HW_USBPHY_PWD_CLR);
}

static void _host_phy_lowpower_suspend(struct fsl_usb2_platform_data *pdata,
					bool enable)
{
	__phy_lowpower_suspend(pdata, enable, ENABLED_BY_HOST);
}

static void _host_wakeup_enable(struct fsl_usb2_platform_data *pdata,
				bool enable)
{
	__wakeup_irq_enable(pdata, enable, ENABLED_BY_HOST);

	if (enable)
		device_wakeup_enable(&pdata->pdev->dev);
	else
		device_wakeup_disable(&pdata->pdev->dev);
}

static enum usb_wakeup_event
_is_host_wakeup(struct fsl_usb2_platform_data *pdata)
{
	u32 wakeup_req = USBC1_CTRL & UCTRL_OWIR;
	u32 otgsc = UOG2_OTGSC;

	if (wakeup_req) {
		pr_debug("the otgsc is 0x%x, usbsts is 0x%x,"
			" portsc is 0x%x, wakeup_irq is 0x%x\n",
			UOG2_OTGSC, UOG2_USBSTS, UOG2_PORTSC1, wakeup_req);
	}
	/* if ID change sts, it is a host wakeup event */
	if (wakeup_req && (otgsc & OTGSC_IS_USB_ID)) {
		pr_debug("otg host ID wakeup\n");
		/* if host ID wakeup, we must clear the b session change sts */
		otgsc &= (~OTGSC_IS_USB_ID);
		return WAKEUP_EVENT_ID;
	}
	if (wakeup_req  && (!(otgsc & OTGSC_STS_USB_ID))) {
		pr_debug("otg host Remote wakeup\n");
		return WAKEUP_EVENT_DPDM;
	}
	return WAKEUP_EVENT_INVALID;
}

static void host_wakeup_handler(struct fsl_usb2_platform_data *pdata)
{
	_host_phy_lowpower_suspend(pdata, false);
	_host_wakeup_enable(pdata, false);
}

/* End of host related operation for DR port */
#endif /* CONFIG_USB_EHCI_ARC_OTG */


void __init mvf_usb_dr2_init(void)
{
	struct platform_device *pdev, *pdev_wakeup;
	u32 reg;

#ifdef CONFIG_USB_EHCI_ARC_OTG
	dr_utmi_config.operating_mode = DR_HOST_MODE;
	dr_utmi_config.wake_up_enable = _host_wakeup_enable;
	dr_utmi_config.platform_suspend = _host_platform_suspend;
	dr_utmi_config.platform_resume  = _host_platform_resume;
	dr_utmi_config.phy_lowpower_suspend = _host_phy_lowpower_suspend;
	dr_utmi_config.is_wakeup_event = _is_host_wakeup;
	dr_utmi_config.wakeup_pdata = &dr_wakeup_config;
	dr_utmi_config.wakeup_handler = host_wakeup_handler;

	pdev = mvf_add_fsl_ehci_otg(&dr_utmi_config);

	dr_wakeup_config.usb_pdata[1] = pdev->dev.platform_data;

	/* register wakeup device */
	pdev_wakeup = mvf_add_fsl_usb2_ehci_otg_wakeup(&dr_wakeup_config);
	if (pdev != NULL)
		((struct fsl_usb2_platform_data *)
			(pdev->dev.platform_data))->wakeup_pdata =
				(struct fsl_usb2_wakeup_platform_data *)
					(pdev_wakeup->dev.platform_data);

	__raw_writel(0x0220C802, USBPHY2_CTRL);
	udelay(20);

	__raw_writel(0x0, USBPHY2_PWD);

	reg = __raw_readl(USBPHY2_DEBUG);
	reg &= ~0x40000000; /* clear clock gate */
	__raw_writel(reg, USBPHY2_DEBUG);

	reg = __raw_readl(ANADIG_USB2_MISC);
	reg |= (0x01 << 30); /* Enable CLK_TO_UTMI */
	__raw_writel(reg, ANADIG_USB2_MISC);

	__raw_writel(0x10000007, USBPHY2_TX);
	/*__raw_writel(0x100F0F07, USBPHY2_TX);*/

	/* Enable disconnect detect */
	reg = __raw_readl(USBPHY2_CTRL);
	reg &= ~0x040; /* clear OTG ID change IRQ */
	reg |= (0x1 << 14); /* Enable UTMI+ level2 */
	reg |= (0x1 << 9);
	reg |= (0x1 << 15); /* Enable UTMI+ level3 */
	reg &= ~((0xD1 << 11) | 0x6);
	__raw_writel(reg, USBPHY2_CTRL);
	__raw_writel(0x1 << 3, USBPHY2_CTRL + 0x8);

	/* Disable VBUS and CHARGER detect */
	reg = __raw_readl(ANADIG_USB2_VBUS_DETECT);
	reg |= 0xE8;
	__raw_writel(reg, ANADIG_USB2_VBUS_DETECT);
	__raw_writel(0x001c0000, ANADIG_USB2_CHRG_DETECT);

#endif
}

/* USB HIGH_SPEED disconnect detect on/off */
void fsl_platform_set_usb_phy_dis(struct fsl_usb2_platform_data *pdata,
		bool enable)
{
	u32 reg;
	reg =  __raw_readl(USBPHY2_CTRL);

	if (enable)
		reg |= ((0xD1 << 11) | 0x6);
	else
		reg &= ~((0xD1 << 11) | 0x6);

	__raw_writel(reg, USBPHY2_CTRL);

	__raw_writel(0x1 << 3, USBPHY2_CTRL + 0x8);

}