USB: Add MUSB and TUSB support

This patch adds support for MUSB and TUSB controllers
integrated into omap2430 and davinci. It also adds support
for external tusb6010 controller.

Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Tony Lindgren <tony@atomide.com>
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 324 insertions, 0 deletions

diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
new file mode 100644
index 00000000000..298b22e6ad0
--- /dev/null
+++ b/drivers/usb/musb/omap2430.c
@@ -0,0 +1,324 @@
+/*
+ * 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
+ * Jarkko Nikula <jarkko.nikula@nokia.com>
+ * 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/slab.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <asm/mach-types.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/mux.h>
+
+#include "musb_core.h"
+#include "omap2430.h"
+
+#ifdef CONFIG_ARCH_OMAP3430
+#define	get_cpu_rev()	2
+#endif
+
+#define MUSB_TIMEOUT_A_WAIT_BCON	1100
+
+static struct timer_list musb_idle_timer;
+
+static void musb_do_idle(unsigned long _musb)
+{
+	struct musb	*musb = (void *)_musb;
+	unsigned long	flags;
+	u8	power;
+	u8	devctl;
+
+	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
+
+	spin_lock_irqsave(&musb->lock, flags);
+
+	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 omap_set_power(struct otg_transceiver *x, unsigned mA)
+{
+	return 0;
+}
+
+static int musb_platform_resume(struct musb *musb);
+
+void 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);
+
+	switch (musb_mode) {
+	case MUSB_HOST:
+		otg_set_host(&musb->xceiv, musb->xceiv.host);
+		break;
+	case MUSB_PERIPHERAL:
+		otg_set_peripheral(&musb->xceiv, musb->xceiv.gadget);
+		break;
+	case MUSB_OTG:
+		break;
+	}
+}
+
+int __init musb_platform_init(struct musb *musb)
+{
+	u32 l;
+
+#if defined(CONFIG_ARCH_OMAP2430)
+	omap_cfg_reg(AE5_2430_USB0HS_STP);
+#endif
+
+	musb_platform_resume(musb);
+
+	l = omap_readl(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 */
+	l |= AUTOIDLE;		/* enable auto idle */
+	omap_writel(l, OTG_SYSCONFIG);
+
+	l = omap_readl(OTG_INTERFSEL);
+	l |= ULPI_12PIN;
+	omap_writel(l, OTG_INTERFSEL);
+
+	pr_debug("HS USB OTG: revision 0x%x, sysconfig 0x%02x, "
+			"sysstatus 0x%x, intrfsel 0x%x, simenable  0x%x\n",
+			omap_readl(OTG_REVISION), omap_readl(OTG_SYSCONFIG),
+			omap_readl(OTG_SYSSTATUS), omap_readl(OTG_INTERFSEL),
+			omap_readl(OTG_SIMENABLE));
+
+	omap_vbus_power(musb, musb->board_mode == MUSB_HOST, 1);
+
+	if (is_host_enabled(musb))
+		musb->board_set_vbus = omap_set_vbus;
+	if (is_peripheral_enabled(musb))
+		musb->xceiv.set_power = omap_set_power;
+	musb->a_wait_bcon = MUSB_TIMEOUT_A_WAIT_BCON;
+
+	setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb);
+
+	return 0;
+}
+
+int musb_platform_suspend(struct musb *musb)
+{
+	u32 l;
+
+	if (!musb->clock)
+		return 0;
+
+	/* in any role */
+	l = omap_readl(OTG_FORCESTDBY);
+	l |= ENABLEFORCE;	/* enable MSTANDBY */
+	omap_writel(l, OTG_FORCESTDBY);
+
+	l = omap_readl(OTG_SYSCONFIG);
+	l |= ENABLEWAKEUP;	/* enable wakeup */
+	omap_writel(l, OTG_SYSCONFIG);
+
+	if (musb->xceiv.set_suspend)
+		musb->xceiv.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;
+
+	if (musb->xceiv.set_suspend)
+		musb->xceiv.set_suspend(&musb->xceiv, 0);
+
+	if (musb->set_clock)
+		musb->set_clock(musb->clock, 1);
+	else
+		clk_enable(musb->clock);
+
+	l = omap_readl(OTG_SYSCONFIG);
+	l &= ~ENABLEWAKEUP;	/* disable wakeup */
+	omap_writel(l, OTG_SYSCONFIG);
+
+	l = omap_readl(OTG_FORCESTDBY);
+	l &= ~ENABLEFORCE;	/* disable MSTANDBY */
+	omap_writel(l, OTG_FORCESTDBY);
+
+	return 0;
+}
+
+
+int musb_platform_exit(struct musb *musb)
+{
+
+	omap_vbus_power(musb, 0 /*off*/, 1);
+
+	musb_platform_suspend(musb);
+
+	clk_put(musb->clock);
+	musb->clock = 0;
+
+	return 0;
+}