drivers/usb/musb/omap2430.c - linux - Git at Google

 /*
  * Copyright (C) 2005-2007 by Texas Instruments
  * Some code has been taken from tusb6010.c
  * Copyrights for that are attributable to:
  * Copyright (C) 2006 Nokia Corporation
  * Tony Lindgren <tony@atomide.com>
  *
  * This file is part of the Inventra Controller Driver for Linux.
  *
  * The Inventra Controller Driver for Linux is free software; you
  * can redistribute it and/or modify it under the terms of the GNU
  * General Public License version 2 as published by the Free Software
  * Foundation.
  *
  * The Inventra Controller Driver for Linux 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 The Inventra Controller Driver for Linux ; if not,
  * write to the Free Software Foundation, Inc., 59 Temple Place,
  * Suite 330, Boston, MA  02111-1307  USA
  *
  */
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/init.h>
 #include <linux/list.h>
 #include <linux/clk.h>
 #include <linux/io.h>

 #include <asm/mach-types.h>
 #include <mach/hardware.h>
 #include <plat/mux.h>

 #include "musb_core.h"
 #include "omap2430.h"

 #ifdef CONFIG_ARCH_OMAP3430
 #define	get_cpu_rev()	2
 #endif


 static struct timer_list musb_idle_timer;

 static void musb_do_idle(unsigned long _musb)
 {
 	struct musb	*musb = (void *)_musb;
 	unsigned long	flags;
 #ifdef CONFIG_USB_MUSB_HDRC_HCD
 	u8	power;
 #endif
 	u8	devctl;

 	spin_lock_irqsave(&musb->lock, flags);

 	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);

 	switch (musb->xceiv->state) {
 	case OTG_STATE_A_WAIT_BCON:
 		devctl &= ~MUSB_DEVCTL_SESSION;
 		musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);

 		devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
 		if (devctl & MUSB_DEVCTL_BDEVICE) {
 			musb->xceiv->state = OTG_STATE_B_IDLE;
 			MUSB_DEV_MODE(musb);
 		} else {
 			musb->xceiv->state = OTG_STATE_A_IDLE;
 			MUSB_HST_MODE(musb);
 		}
 		break;
 #ifdef CONFIG_USB_MUSB_HDRC_HCD
 	case OTG_STATE_A_SUSPEND:
 		/* finish RESUME signaling? */
 		if (musb->port1_status & MUSB_PORT_STAT_RESUME) {
 			power = musb_readb(musb->mregs, MUSB_POWER);
 			power &= ~MUSB_POWER_RESUME;
 			DBG(1, "root port resume stopped, power %02x\n", power);
 			musb_writeb(musb->mregs, MUSB_POWER, power);
 			musb->is_active = 1;
 			musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
 						| MUSB_PORT_STAT_RESUME);
 			musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
 			usb_hcd_poll_rh_status(musb_to_hcd(musb));
 			/* NOTE: it might really be A_WAIT_BCON ... */
 			musb->xceiv->state = OTG_STATE_A_HOST;
 		}
 		break;
 #endif
 #ifdef CONFIG_USB_MUSB_HDRC_HCD
 	case OTG_STATE_A_HOST:
 		devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
 		if (devctl &  MUSB_DEVCTL_BDEVICE)
 			musb->xceiv->state = OTG_STATE_B_IDLE;
 		else
 			musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
 #endif
 	default:
 		break;
 	}
 	spin_unlock_irqrestore(&musb->lock, flags);
 }


 void musb_platform_try_idle(struct musb *musb, unsigned long timeout)
 {
 	unsigned long		default_timeout = jiffies + msecs_to_jiffies(3);
 	static unsigned long	last_timer;

 	if (timeout == 0)
 		timeout = default_timeout;

 	/* Never idle if active, or when VBUS timeout is not set as host */
 	if (musb->is_active || ((musb->a_wait_bcon == 0)
 			&& (musb->xceiv->state == OTG_STATE_A_WAIT_BCON))) {
 		DBG(4, "%s active, deleting timer\n", otg_state_string(musb));
 		del_timer(&musb_idle_timer);
 		last_timer = jiffies;
 		return;
 	}

 	if (time_after(last_timer, timeout)) {
 		if (!timer_pending(&musb_idle_timer))
 			last_timer = timeout;
 		else {
 			DBG(4, "Longer idle timer already pending, ignoring\n");
 			return;
 		}
 	}
 	last_timer = timeout;

 	DBG(4, "%s inactive, for idle timer for %lu ms\n",
 		otg_state_string(musb),
 		(unsigned long)jiffies_to_msecs(timeout - jiffies));
 	mod_timer(&musb_idle_timer, timeout);
 }

 void musb_platform_enable(struct musb *musb)
 {
 }
 void musb_platform_disable(struct musb *musb)
 {
 }
 static void omap_vbus_power(struct musb *musb, int is_on, int sleeping)
 {
 }

 static void omap_set_vbus(struct musb *musb, int is_on)
 {
 	u8		devctl;
 	/* HDRC controls CPEN, but beware current surges during device
 	 * connect.  They can trigger transient overcurrent conditions
 	 * that must be ignored.
 	 */

 	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);

 	if (is_on) {
 		musb->is_active = 1;
 		musb->xceiv->default_a = 1;
 		musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
 		devctl |= MUSB_DEVCTL_SESSION;

 		MUSB_HST_MODE(musb);
 	} else {
 		musb->is_active = 0;

 		/* NOTE:  we're skipping A_WAIT_VFALL -> A_IDLE and
 		 * jumping right to B_IDLE...
 		 */

 		musb->xceiv->default_a = 0;
 		musb->xceiv->state = OTG_STATE_B_IDLE;
 		devctl &= ~MUSB_DEVCTL_SESSION;

 		MUSB_DEV_MODE(musb);
 	}
 	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);

 	DBG(1, "VBUS %s, devctl %02x "
 		/* otg %3x conf %08x prcm %08x */ "\n",
 		otg_state_string(musb),
 		musb_readb(musb->mregs, MUSB_DEVCTL));
 }

 static int musb_platform_resume(struct musb *musb);

 int musb_platform_set_mode(struct musb *musb, u8 musb_mode)
 {
 	u8	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);

 	devctl |= MUSB_DEVCTL_SESSION;
 	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);

 	return 0;
 }

 int __init musb_platform_init(struct musb *musb)
 {
 	u32 l;

 #if defined(CONFIG_ARCH_OMAP2430)
 	omap_cfg_reg(AE5_2430_USB0HS_STP);
 #endif

 	/* We require some kind of external transceiver, hooked
 	 * up through ULPI.  TWL4030-family PMICs include one,
 	 * which needs a driver, drivers aren't always needed.
 	 */
 	musb->xceiv = otg_get_transceiver();
 	if (!musb->xceiv) {
 		pr_err("HS USB OTG: no transceiver configured\n");
 		return -ENODEV;
 	}

 	musb_platform_resume(musb);

 	l = musb_readl(musb->mregs, OTG_SYSCONFIG);
 	l &= ~ENABLEWAKEUP;	/* disable wakeup */
 	l &= ~NOSTDBY;		/* remove possible nostdby */
 	l |= SMARTSTDBY;	/* enable smart standby */
 	l &= ~AUTOIDLE;		/* disable auto idle */
 	l &= ~NOIDLE;		/* remove possible noidle */
 	l |= SMARTIDLE;		/* enable smart idle */
 	/*
 	 * MUSB AUTOIDLE don't work in 3430.
 	 * Workaround by Richard Woodruff/TI
 	 */
 	if (!cpu_is_omap3430())
 		l |= AUTOIDLE;		/* enable auto idle */
 	musb_writel(musb->mregs, OTG_SYSCONFIG, l);

 	l = musb_readl(musb->mregs, OTG_INTERFSEL);
 	l |= ULPI_12PIN;
 	musb_writel(musb->mregs, OTG_INTERFSEL, l);

 	pr_debug("HS USB OTG: revision 0x%x, sysconfig 0x%02x, "
 			"sysstatus 0x%x, intrfsel 0x%x, simenable  0x%x\n",
 			musb_readl(musb->mregs, OTG_REVISION),
 			musb_readl(musb->mregs, OTG_SYSCONFIG),
 			musb_readl(musb->mregs, OTG_SYSSTATUS),
 			musb_readl(musb->mregs, OTG_INTERFSEL),
 			musb_readl(musb->mregs, OTG_SIMENABLE));

 	omap_vbus_power(musb, musb->board_mode == MUSB_HOST, 1);

 	if (is_host_enabled(musb))
 		musb->board_set_vbus = omap_set_vbus;

 	setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb);

 	return 0;
 }

 #ifdef CONFIG_PM
 void musb_platform_save_context(struct musb *musb,
 		struct musb_context_registers *musb_context)
 {
 	musb_context->otg_sysconfig = musb_readl(musb->mregs, OTG_SYSCONFIG);
 	musb_context->otg_forcestandby = musb_readl(musb->mregs, OTG_FORCESTDBY);
 }

 void musb_platform_restore_context(struct musb *musb,
 		struct musb_context_registers *musb_context)
 {
 	musb_writel(musb->mregs, OTG_SYSCONFIG, musb_context->otg_sysconfig);
 	musb_writel(musb->mregs, OTG_FORCESTDBY, musb_context->otg_forcestandby);
 }
 #endif

 int musb_platform_suspend(struct musb *musb)
 {
 	u32 l;

 	if (!musb->clock)
 		return 0;

 	/* in any role */
 	l = musb_readl(musb->mregs, OTG_FORCESTDBY);
 	l |= ENABLEFORCE;	/* enable MSTANDBY */
 	musb_writel(musb->mregs, OTG_FORCESTDBY, l);

 	l = musb_readl(musb->mregs, OTG_SYSCONFIG);
 	l |= ENABLEWAKEUP;	/* enable wakeup */
 	musb_writel(musb->mregs, OTG_SYSCONFIG, l);

 	otg_set_suspend(musb->xceiv, 1);

 	if (musb->set_clock)
 		musb->set_clock(musb->clock, 0);
 	else
 		clk_disable(musb->clock);

 	return 0;
 }

 static int musb_platform_resume(struct musb *musb)
 {
 	u32 l;

 	if (!musb->clock)
 		return 0;

 	otg_set_suspend(musb->xceiv, 0);

 	if (musb->set_clock)
 		musb->set_clock(musb->clock, 1);
 	else
 		clk_enable(musb->clock);

 	l = musb_readl(musb->mregs, OTG_SYSCONFIG);
 	l &= ~ENABLEWAKEUP;	/* disable wakeup */
 	musb_writel(musb->mregs, OTG_SYSCONFIG, l);

 	l = musb_readl(musb->mregs, OTG_FORCESTDBY);
 	l &= ~ENABLEFORCE;	/* disable MSTANDBY */
 	musb_writel(musb->mregs, OTG_FORCESTDBY, l);

 	return 0;
 }


 int musb_platform_exit(struct musb *musb)
 {

 	omap_vbus_power(musb, 0 /*off*/, 1);

 	musb_platform_suspend(musb);

 	return 0;
 }
	/*
	* Copyright (C) 2005-2007 by Texas Instruments
	* Some code has been taken from tusb6010.c
	* Copyrights for that are attributable to:
	* Copyright (C) 2006 Nokia Corporation
	* Tony Lindgren <tony@atomide.com>
	*
	* This file is part of the Inventra Controller Driver for Linux.
	*
	* The Inventra Controller Driver for Linux is free software; you
	* can redistribute it and/or modify it under the terms of the GNU
	* General Public License version 2 as published by the Free Software
	* Foundation.
	*
	* The Inventra Controller Driver for Linux 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 The Inventra Controller Driver for Linux ; if not,
	* write to the Free Software Foundation, Inc., 59 Temple Place,
	* Suite 330, Boston, MA 02111-1307 USA
	*
	*/
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/sched.h>
	#include <linux/init.h>
	#include <linux/list.h>
	#include <linux/clk.h>
	#include <linux/io.h>

	#include <asm/mach-types.h>
	#include <mach/hardware.h>
	#include <plat/mux.h>

	#include "musb_core.h"
	#include "omap2430.h"

	#ifdef CONFIG_ARCH_OMAP3430
	#define get_cpu_rev() 2
	#endif


	static struct timer_list musb_idle_timer;

	static void musb_do_idle(unsigned long _musb)
	{
	struct musb musb = (void )_musb;
	unsigned long flags;
	#ifdef CONFIG_USB_MUSB_HDRC_HCD
	u8 power;
	#endif
	u8 devctl;

	spin_lock_irqsave(&musb->lock, flags);

	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);

	switch (musb->xceiv->state) {
	case OTG_STATE_A_WAIT_BCON:
	devctl &= ~MUSB_DEVCTL_SESSION;
	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);

	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
	if (devctl & MUSB_DEVCTL_BDEVICE) {
	musb->xceiv->state = OTG_STATE_B_IDLE;
	MUSB_DEV_MODE(musb);
	} else {
	musb->xceiv->state = OTG_STATE_A_IDLE;
	MUSB_HST_MODE(musb);
	}
	break;
	#ifdef CONFIG_USB_MUSB_HDRC_HCD
	case OTG_STATE_A_SUSPEND:
	/* finish RESUME signaling? */
	if (musb->port1_status & MUSB_PORT_STAT_RESUME) {
	power = musb_readb(musb->mregs, MUSB_POWER);
	power &= ~MUSB_POWER_RESUME;
	DBG(1, "root port resume stopped, power %02x\n", power);
	musb_writeb(musb->mregs, MUSB_POWER, power);
	musb->is_active = 1;
	musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
	\| MUSB_PORT_STAT_RESUME);
	musb->port1_status \|= USB_PORT_STAT_C_SUSPEND << 16;
	usb_hcd_poll_rh_status(musb_to_hcd(musb));
	/* NOTE: it might really be A_WAIT_BCON ... */
	musb->xceiv->state = OTG_STATE_A_HOST;
	}
	break;
	#endif
	#ifdef CONFIG_USB_MUSB_HDRC_HCD
	case OTG_STATE_A_HOST:
	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
	if (devctl & MUSB_DEVCTL_BDEVICE)
	musb->xceiv->state = OTG_STATE_B_IDLE;
	else
	musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
	#endif
	default:
	break;
	}
	spin_unlock_irqrestore(&musb->lock, flags);
	}


	void musb_platform_try_idle(struct musb *musb, unsigned long timeout)
	{
	unsigned long default_timeout = jiffies + msecs_to_jiffies(3);
	static unsigned long last_timer;

	if (timeout == 0)
	timeout = default_timeout;

	/* Never idle if active, or when VBUS timeout is not set as host */
	if (musb->is_active \|\| ((musb->a_wait_bcon == 0)
	&& (musb->xceiv->state == OTG_STATE_A_WAIT_BCON))) {
	DBG(4, "%s active, deleting timer\n", otg_state_string(musb));
	del_timer(&musb_idle_timer);
	last_timer = jiffies;
	return;
	}

	if (time_after(last_timer, timeout)) {
	if (!timer_pending(&musb_idle_timer))
	last_timer = timeout;
	else {
	DBG(4, "Longer idle timer already pending, ignoring\n");
	return;
	}
	}
	last_timer = timeout;

	DBG(4, "%s inactive, for idle timer for %lu ms\n",
	otg_state_string(musb),
	(unsigned long)jiffies_to_msecs(timeout - jiffies));
	mod_timer(&musb_idle_timer, timeout);
	}

	void musb_platform_enable(struct musb *musb)
	{
	}
	void musb_platform_disable(struct musb *musb)
	{
	}
	static void omap_vbus_power(struct musb *musb, int is_on, int sleeping)
	{
	}

	static void omap_set_vbus(struct musb *musb, int is_on)
	{
	u8 devctl;
	/* HDRC controls CPEN, but beware current surges during device
	* connect. They can trigger transient overcurrent conditions
	* that must be ignored.
	*/

	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);

	if (is_on) {
	musb->is_active = 1;
	musb->xceiv->default_a = 1;
	musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
	devctl \|= MUSB_DEVCTL_SESSION;

	MUSB_HST_MODE(musb);
	} else {
	musb->is_active = 0;

	/* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and
	* jumping right to B_IDLE...
	*/

	musb->xceiv->default_a = 0;
	musb->xceiv->state = OTG_STATE_B_IDLE;
	devctl &= ~MUSB_DEVCTL_SESSION;

	MUSB_DEV_MODE(musb);
	}
	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);

	DBG(1, "VBUS %s, devctl %02x "
	/* otg %3x conf %08x prcm %08x */ "\n",
	otg_state_string(musb),
	musb_readb(musb->mregs, MUSB_DEVCTL));
	}

	static int musb_platform_resume(struct musb *musb);

	int musb_platform_set_mode(struct musb *musb, u8 musb_mode)
	{
	u8 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);

	devctl \|= MUSB_DEVCTL_SESSION;
	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);

	return 0;
	}

	int __init musb_platform_init(struct musb *musb)
	{
	u32 l;

	#if defined(CONFIG_ARCH_OMAP2430)
	omap_cfg_reg(AE5_2430_USB0HS_STP);
	#endif

	/* We require some kind of external transceiver, hooked
	* up through ULPI. TWL4030-family PMICs include one,
	* which needs a driver, drivers aren't always needed.
	*/
	musb->xceiv = otg_get_transceiver();
	if (!musb->xceiv) {
	pr_err("HS USB OTG: no transceiver configured\n");
	return -ENODEV;
	}

	musb_platform_resume(musb);

	l = musb_readl(musb->mregs, OTG_SYSCONFIG);
	l &= ~ENABLEWAKEUP; /* disable wakeup */
	l &= ~NOSTDBY; /* remove possible nostdby */
	l \|= SMARTSTDBY; /* enable smart standby */
	l &= ~AUTOIDLE; /* disable auto idle */
	l &= ~NOIDLE; /* remove possible noidle */
	l \|= SMARTIDLE; /* enable smart idle */
	/*
	* MUSB AUTOIDLE don't work in 3430.
	* Workaround by Richard Woodruff/TI
	*/
	if (!cpu_is_omap3430())
	l \|= AUTOIDLE; /* enable auto idle */
	musb_writel(musb->mregs, OTG_SYSCONFIG, l);

	l = musb_readl(musb->mregs, OTG_INTERFSEL);
	l \|= ULPI_12PIN;
	musb_writel(musb->mregs, OTG_INTERFSEL, l);

	pr_debug("HS USB OTG: revision 0x%x, sysconfig 0x%02x, "
	"sysstatus 0x%x, intrfsel 0x%x, simenable 0x%x\n",
	musb_readl(musb->mregs, OTG_REVISION),
	musb_readl(musb->mregs, OTG_SYSCONFIG),
	musb_readl(musb->mregs, OTG_SYSSTATUS),
	musb_readl(musb->mregs, OTG_INTERFSEL),
	musb_readl(musb->mregs, OTG_SIMENABLE));

	omap_vbus_power(musb, musb->board_mode == MUSB_HOST, 1);

	if (is_host_enabled(musb))
	musb->board_set_vbus = omap_set_vbus;

	setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb);

	return 0;
	}

	#ifdef CONFIG_PM
	void musb_platform_save_context(struct musb *musb,
	struct musb_context_registers *musb_context)
	{
	musb_context->otg_sysconfig = musb_readl(musb->mregs, OTG_SYSCONFIG);
	musb_context->otg_forcestandby = musb_readl(musb->mregs, OTG_FORCESTDBY);
	}

	void musb_platform_restore_context(struct musb *musb,
	struct musb_context_registers *musb_context)
	{
	musb_writel(musb->mregs, OTG_SYSCONFIG, musb_context->otg_sysconfig);
	musb_writel(musb->mregs, OTG_FORCESTDBY, musb_context->otg_forcestandby);
	}
	#endif

	int musb_platform_suspend(struct musb *musb)
	{
	u32 l;

	if (!musb->clock)
	return 0;

	/* in any role */
	l = musb_readl(musb->mregs, OTG_FORCESTDBY);
	l \|= ENABLEFORCE; /* enable MSTANDBY */
	musb_writel(musb->mregs, OTG_FORCESTDBY, l);

	l = musb_readl(musb->mregs, OTG_SYSCONFIG);
	l \|= ENABLEWAKEUP; /* enable wakeup */
	musb_writel(musb->mregs, OTG_SYSCONFIG, l);

	otg_set_suspend(musb->xceiv, 1);

	if (musb->set_clock)
	musb->set_clock(musb->clock, 0);
	else
	clk_disable(musb->clock);

	return 0;
	}

	static int musb_platform_resume(struct musb *musb)
	{
	u32 l;

	if (!musb->clock)
	return 0;

	otg_set_suspend(musb->xceiv, 0);

	if (musb->set_clock)
	musb->set_clock(musb->clock, 1);
	else
	clk_enable(musb->clock);

	l = musb_readl(musb->mregs, OTG_SYSCONFIG);
	l &= ~ENABLEWAKEUP; /* disable wakeup */
	musb_writel(musb->mregs, OTG_SYSCONFIG, l);

	l = musb_readl(musb->mregs, OTG_FORCESTDBY);
	l &= ~ENABLEFORCE; /* disable MSTANDBY */
	musb_writel(musb->mregs, OTG_FORCESTDBY, l);

	return 0;
	}


	int musb_platform_exit(struct musb *musb)
	{

	omap_vbus_power(musb, 0 /off/, 1);

	musb_platform_suspend(musb);

	return 0;
	}