Texas Instruments DA830/OMAP-L137 glue layer for the MUSBMHRDC driver.
Signed-off-by: Sergei Shtylyov <sshtylyov@xxxxxxxxxxxxx>
Signed-off-by: Yadviga Grigorieva <yadviga@xxxxxxxxxxxxx>
---
The patch is against the recent DaVinci tree.
Reposting with proper signoffs...
arch/arm/mach-davinci/include/mach/usb.h | 40 ++
drivers/usb/musb/Kconfig | 5
drivers/usb/musb/Makefile | 6
drivers/usb/musb/da830.c | 522 +++++++++++++++++++++++++++++++
drivers/usb/musb/musb_core.h | 1
5 files changed, 572 insertions(+), 2 deletions(-)
Index: linux-davinci/arch/arm/mach-davinci/include/mach/usb.h
===================================================================
--- /dev/null
+++ linux-davinci/arch/arm/mach-davinci/include/mach/usb.h
@@ -0,0 +1,40 @@
+/*
+ * USB related definitions
+ *
+ * Copyright (C) 2009 MontaVista Software, Inc. <source@xxxxxxxxxx>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#ifndef __ASM_ARCH_USB_H
+#define __ASM_ARCH_USB_H
+
+/* DA8xx has 5 CFGCHIP registers */
+#define DA830_CFGCHIP(n) (DA830_BOOT_CFG_BASE + 0x17c + (n) * 4)
+
+/* DA8xx CFGCHIP2 (USB 2.0 PHY Control) register bits */
+#define CFGCHIP2_PHYCLKGD (1 << 17)
+#define CFGCHIP2_VBUSSENSE (1 << 16)
+#define CFGCHIP2_RESET (1 << 15)
+#define CFGCHIP2_OTGMODE (3 << 13)
+#define CFGCHIP2_NO_OVERRIDE (0 << 13)
+#define CFGCHIP2_FORCE_HOST (1 << 13)
+#define CFGCHIP2_FORCE_DEVICE (2 << 13)
+#define CFGCHIP2_FORCE_HOST_VBUS_LOW (3 << 13)
+#define CFGCHIP2_USB1PHYCLKMUX (1 << 12)
+#define CFGCHIP2_USB2PHYCLKMUX (1 << 11)
+#define CFGCHIP2_PHYPWRDN (1 << 10)
+#define CFGCHIP2_OTGPWRDN (1 << 9)
+#define CFGCHIP2_DATPOL (1 << 8)
+#define CFGCHIP2_USB1SUSPENDM (1 << 7)
+#define CFGCHIP2_PHY_PLLON (1 << 6) /* override PLL suspend */
+#define CFGCHIP2_SESENDEN (1 << 5) /* Vsess_end comparator */
+#define CFGCHIP2_VBDTCTEN (1 << 4) /* Vbus comparator */
+#define CFGCHIP2_REFFREQ (0xf << 0)
+#define CFGCHIP2_REFFREQ_12MHZ (1 << 0)
+#define CFGCHIP2_REFFREQ_24MHZ (2 << 0)
+#define CFGCHIP2_REFFREQ_48MHZ (3 << 0)
+
+#endif /* ifndef __ASM_ARCH_USB_H */
Index: linux-davinci/drivers/usb/musb/Kconfig
===================================================================
--- linux-davinci.orig/drivers/usb/musb/Kconfig
+++ linux-davinci/drivers/usb/musb/Kconfig
@@ -41,7 +41,10 @@ config USB_MUSB_SOC
default y if (BF52x && !BF522 && !BF523)
comment "DaVinci 35x and 644x USB support"
- depends on USB_MUSB_HDRC && ARCH_DAVINCI
+ depends on USB_MUSB_HDRC && ARCH_DAVINCI_DMx
+
+comment "DA830/OMAP-L137 USB support"
+ depends on USB_MUSB_HDRC && ARCH_DAVINCI_DA830
comment "OMAP 243x high speed USB support"
depends on USB_MUSB_HDRC && ARCH_OMAP2430
Index: linux-davinci/drivers/usb/musb/Makefile
===================================================================
--- linux-davinci.orig/drivers/usb/musb/Makefile
+++ linux-davinci/drivers/usb/musb/Makefile
@@ -6,10 +6,14 @@ musb_hdrc-objs := musb_core.o
obj-$(CONFIG_USB_MUSB_HDRC) += musb_hdrc.o
-ifeq ($(CONFIG_ARCH_DAVINCI),y)
+ifeq ($(CONFIG_ARCH_DAVINCI_DMx),y)
musb_hdrc-objs += davinci.o
endif
+ifeq ($(CONFIG_ARCH_DAVINCI_DA830),y)
+ musb_hdrc-objs += da830.o
+endif
+
ifeq ($(CONFIG_USB_TUSB6010),y)
musb_hdrc-objs += tusb6010.o
endif
Index: linux-davinci/drivers/usb/musb/da830.c
===================================================================
--- /dev/null
+++ linux-davinci/drivers/usb/musb/da830.c
@@ -0,0 +1,522 @@
+/*
+ * Texas Instruments DA830/OMAP-L137 "glue layer"
+ *
+ * Copyright (c) 2008-2009 MontaVista Software, Inc. <source@xxxxxxxxxx>
+ *
+ * Based on the DaVinci "glue layer" code.
+ * Copyright (C) 2005-2006 by Texas Instruments
+ *
+ * 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/init.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <mach/cppi41.h>
+#include <mach/hardware.h>
+#include <mach/usb.h>
+
+#include "musb_core.h"
+#include "cppi41_dma.h"
+
+/*
+ * DA830 specific definitions
+ */
+
+#define DA830_TX_EP_MASK 0x1f /* EP0 + 4 Tx EPs */
+#define DA830_RX_EP_MASK 0x1e /* 4 Rx EPs */
+
+#define DA830_TX_INTR_MASK (DA830_TX_EP_MASK << USB_INTR_TX_SHIFT)
+#define DA830_RX_INTR_MASK (DA830_RX_EP_MASK << USB_INTR_RX_SHIFT)
+
+#define A_WAIT_BCON_TIMEOUT 1100 /* in ms */
+
+#define CFGCHIP2 IO_ADDRESS(DA830_CFGCHIP(2))
+
+#ifdef CONFIG_USB_TI_CPPI41_DMA
+
+/*
+ * CPPI 4.1 resources used for USB OTG controller module:
+ *
+ * USB DMA DMA QMgr Tx Src
+ * Tx Rx QNum Port
+ * ---------------------------------
+ * EP0 0 0 0 16,17 1
+ * ---------------------------------
+ * EP1 1 1 0 18,19 2
+ * ---------------------------------
+ * EP2 2 2 0 20,21 3
+ * ---------------------------------
+ * EP3 3 3 0 22,23 4
+ * ---------------------------------
+ */
+
+static const u16 tx_comp_q[] = { 24, 25 };
+static const u16 rx_comp_q[] = { 26, 27 };
+
+const struct usb_cppi41_info usb_cppi41_info = {
+ .dma_block = 0,
+ .ep_dma_ch = { 0, 1, 2, 3 },
+ .q_mgr = 0,
+ .num_tx_comp_q = 2,
+ .num_rx_comp_q = 2,
+ .tx_comp_q = tx_comp_q,
+ .rx_comp_q = rx_comp_q
+};
+
+#endif /* CONFIG_USB_TI_CPPI41_DMA */
+
+/*
+ * REVISIT (PM): we should be able to keep the PHY in low power mode most
+ * of the time (24 MHz oscillator and PLL off, etc.) by setting POWER.D0
+ * and, when in host mode, autosuspending idle root ports... PHY_PLLON
+ * (overriding SUSPENDM?) then likely needs to stay off.
+ */
+
+static inline void phy_on(void)
+{
+ u32 cfgchip2;
+
+ /*
+ * Start the on-chip PHY and its PLL.
+ */
+ cfgchip2 = __raw_readl(CFGCHIP2);
+ cfgchip2 &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN);
+ cfgchip2 |= CFGCHIP2_PHY_PLLON;
+ __raw_writel(cfgchip2, CFGCHIP2);
+
+ pr_info("Waiting for USB PHY clock good...\n");
+ while (!(__raw_readl(CFGCHIP2) & CFGCHIP2_PHYCLKGD))
+ cpu_relax();
+}
+
+static inline void phy_off(void)
+{
+ u32 cfgchip2;
+
+ /*
+ * Power down the on-chip PHY.
+ */
+ cfgchip2 = __raw_readl(CFGCHIP2);
+ cfgchip2 |= CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN;
+ __raw_writel(cfgchip2, CFGCHIP2);
+}
+
+/*
+ * Because we don't set CTRL.UINT, it's "important" to:
+ * - not read/write INTRUSB/INTRUSBE (except during
+ * initial setup, as a workaround);
+ * - use INTSET/INTCLR instead.
+ */
+
+/**
+ * musb_platform_enable - enable interrupts
+ */
+void musb_platform_enable(struct musb *musb)
+{
+ void __iomem *reg_base = musb->ctrl_base;
+ u32 mask;
+
+ /* Workaround: setup IRQs through both register sets. */
+ mask = ((musb->epmask & DA830_TX_EP_MASK) << USB_INTR_TX_SHIFT) |
+ ((musb->epmask & DA830_RX_EP_MASK) << USB_INTR_RX_SHIFT) |
+ USB_INTR_USB_MASK;
+ musb_writel(reg_base, USB_INTR_MASK_SET_REG, mask);
+
+ /* Force the DRVVBUS IRQ so we can start polling for ID change. */
+ if (is_otg_enabled(musb))
+ musb_writel(reg_base, USB_INTR_SRC_SET_REG,
+ USB_INTR_DRVVBUS << USB_INTR_USB_SHIFT);
+}
+
+/**
+ * musb_platform_disable - disable HDRC and flush interrupts
+ */
+void musb_platform_disable(struct musb *musb)
+{
+ void __iomem *reg_base = musb->ctrl_base;
+
+ musb_writel(reg_base, USB_INTR_MASK_CLEAR_REG, USB_INTR_USB_MASK |
+ DA830_TX_INTR_MASK | DA830_RX_INTR_MASK);
+ musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
+ musb_writel(reg_base, USB_END_OF_INTR_REG, 0);
+}
+
+#ifdef CONFIG_USB_MUSB_HDRC_HCD
+#define portstate(stmt) stmt
+#else
+#define portstate(stmt)
+#endif
+
+static void da830_set_vbus(struct musb *musb, int is_on)
+{
+ WARN_ON(is_on && is_peripheral_active(musb));
+}
+
+#define POLL_SECONDS 2
+
+static struct timer_list otg_workaround;
+
+static void otg_timer(unsigned long _musb)
+{
+ struct musb *musb = (void *)_musb;
+ void __iomem *mregs = musb->mregs;
+ u8 devctl;
+ unsigned long flags;
+
+ /*
+ * We poll because DaVinci's won't expose several OTG-critical
+ * status change events (from the transceiver) otherwise.
+ */
+ devctl = musb_readb(mregs, MUSB_DEVCTL);
+ DBG(7, "Poll devctl %02x (%s)\n", devctl, otg_state_string(musb));
+
+ 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;
+ case OTG_STATE_A_WAIT_VFALL:
+ /*
+ * Wait till VBUS falls below SessionEnd (~0.2 V); the 1.3
+ * RTL seems to mis-handle session "start" otherwise (or in
+ * our case "recover"), in routine "VBUS was valid by the time
+ * VBUSERR got reported during enumeration" cases.
+ */
+ if (devctl & MUSB_DEVCTL_VBUS) {
+ mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ);
+ break;
+ }
+ musb->xceiv.state = OTG_STATE_A_WAIT_VRISE;
+ musb_writel(musb->ctrl_base, USB_INTR_SRC_SET_REG,
+ MUSB_INTR_VBUSERROR << USB_INTR_USB_SHIFT);
+ break;
+ case OTG_STATE_B_IDLE:
+ if (!is_peripheral_enabled(musb))
+ break;
+
+ /*
+ * There's no ID-changed IRQ, so we have no good way to tell
+ * when to switch to the A-Default state machine (by setting
+ * the DEVCTL.Session bit).
+ *
+ * Workaround: whenever we're in B_IDLE, try setting the
+ * session flag every few seconds. If it works, ID was
+ * grounded and we're now in the A-Default state machine.
+ *
+ * NOTE: setting the session flag is _supposed_ to trigger
+ * SRP but clearly it doesn't.
+ */
+ musb_writeb(mregs, MUSB_DEVCTL, devctl | MUSB_DEVCTL_SESSION);
+ devctl = musb_readb(mregs, MUSB_DEVCTL);
+ if (devctl & MUSB_DEVCTL_BDEVICE)
+ mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ);
+ else
+ musb->xceiv.state = OTG_STATE_A_IDLE;
+ break;
+ default:
+ break;
+ }
+ spin_unlock_irqrestore(&musb->lock, flags);
+}
+
+void musb_platform_try_idle(struct musb *musb, unsigned long timeout)
+{
+ static unsigned long last_timer;
+
+ if (!is_otg_enabled(musb))
+ return;
+
+ if (timeout == 0)
+ timeout = jiffies + msecs_to_jiffies(3);
+
+ /* 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(&otg_workaround);
+ last_timer = jiffies;
+ return;
+ }
+
+ if (time_after(last_timer, timeout) && timer_pending(&otg_workaround)) {
+ DBG(4, "Longer idle timer already pending, ignoring...\n");
+ return;
+ }
+ last_timer = timeout;
+
+ DBG(4, "%s inactive, starting idle timer for %u ms\n",
+ otg_state_string(musb), jiffies_to_msecs(timeout - jiffies));
+ mod_timer(&otg_workaround, timeout);
+}
+
+static irqreturn_t da830_interrupt(int irq, void *hci)
+{
+ struct musb *musb = hci;
+ void __iomem *reg_base = musb->ctrl_base;
+ unsigned long flags;
+ irqreturn_t ret = IRQ_NONE;
+ u32 status, pend0 = 0;
+
+ spin_lock_irqsave(&musb->lock, flags);
+
+ /*
+ * NOTE: DA830 shadows the Mentor IRQs. Don't manage them through
+ * the Mentor registers (except for setup), use the TI ones and EOI.
+ */
+
+ /*
+ * CPPI 4.1 interrupts share the same IRQ and the EOI register but
+ * don't get reflected in the interrupt source/mask registers.
+ */
+ if (is_cppi41_enabled()) {
+ /*
+ * Check for the interrupts from Tx/Rx completion queues; they
+ * are level-triggered and will stay asserted until the queues
+ * are emptied. We're using the queue pending register 0 as a
+ * substitute for the interrupt status register and reading it
+ * directly for speed.
+ */
+ pend0 = musb_readl(reg_base, 0x4000 +
+ QMGR_QUEUE_PENDING_REG(0));
+ if (pend0 & (0xf << 24)) { /* queues 24 to 27 */
+ u32 tx = (pend0 >> 24) & 0x3;
+ u32 rx = (pend0 >> 26) & 0x3;
+
+ DBG(4, "CPPI 4.1 IRQ: Tx %x, Rx %x\n", tx, rx);
+ cppi41_completion(musb, rx, tx);
+ ret = IRQ_HANDLED;
+ }
+ }
+
+ /* Acknowledge and handle non-CPPI interrupts */
+ status = musb_readl(reg_base, USB_INTR_SRC_MASKED_REG);
+ if (!status)
+ goto eoi;
+
+ musb_writel(reg_base, USB_INTR_SRC_CLEAR_REG, status);
+ DBG(4, "USB IRQ %08x\n", status);
+
+ musb->int_rx = (status & DA830_RX_INTR_MASK) >> USB_INTR_RX_SHIFT;
+ musb->int_tx = (status & DA830_TX_INTR_MASK) >> USB_INTR_TX_SHIFT;
+ musb->int_usb = (status & USB_INTR_USB_MASK) >> USB_INTR_USB_SHIFT;
+
+ /*
+ * DRVVBUS IRQs are the only proxy we have (a very poor one!) for
+ * DA830's missing ID change IRQ. We need an ID change IRQ to
+ * switch appropriately between halves of the OTG state machine.
+ * Managing DEVCTL.Session per Mentor docs requires that we know its
+ * value but DEVCTL.BDevice is invalid without DEVCTL.Session set.
+ * Also, DRVVBUS pulses for SRP (but not at 5 V)...
+ */
+ if (status & (USB_INTR_DRVVBUS << USB_INTR_USB_SHIFT)) {
+ int drvvbus = musb_readl(reg_base, USB_STAT_REG);
+ void __iomem *mregs = musb->mregs;
+ u8 devctl = musb_readb(mregs, MUSB_DEVCTL);
+ int err;
+
+ err = is_host_enabled(musb) && (musb->int_usb &
+ MUSB_INTR_VBUSERROR);
+ if (err) {
+ /*
+ * The Mentor core doesn't debounce VBUS as needed
+ * to cope with device connect current spikes. This
+ * means it's not uncommon for bus-powered devices
+ * to get VBUS errors during enumeration.
+ *
+ * This is a workaround, but newer RTL from Mentor
+ * seems to allow a better one: "re"-starting sessions
+ * without waiting for VBUS to stop registering in
+ * devctl.
+ */
+ musb->int_usb &= ~MUSB_INTR_VBUSERROR;
+ musb->xceiv.state = OTG_STATE_A_WAIT_VFALL;
+ mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ);
+ WARNING("VBUS error workaround (delay coming)\n");
+ } else if (is_host_enabled(musb) && drvvbus) {
+ musb->is_active = 1;
+ MUSB_HST_MODE(musb);
+ musb->xceiv.default_a = 1;
+ musb->xceiv.state = OTG_STATE_A_WAIT_VRISE;
+ portstate(musb->port1_status |= USB_PORT_STAT_POWER);
+ del_timer(&otg_workaround);
+ } else {
+ musb->is_active = 0;
+ MUSB_DEV_MODE(musb);
+ musb->xceiv.default_a = 0;
+ musb->xceiv.state = OTG_STATE_B_IDLE;
+ portstate(musb->port1_status &= ~USB_PORT_STAT_POWER);
+ }
+
+ DBG(2, "VBUS %s (%s)%s, devctl %02x\n",
+ drvvbus ? "on" : "off",
+ otg_state_string(musb),
+ err ? " ERROR" : "",
+ devctl);
+ ret = IRQ_HANDLED;
+ }
+
+ if (musb->int_tx || musb->int_rx || musb->int_usb)
+ ret |= musb_interrupt(musb);
+
+ eoi:
+ /* EOI needs to be written for the IRQ to be re-asserted. */
+ if (ret == IRQ_HANDLED || status)
+ musb_writel(reg_base, USB_END_OF_INTR_REG, 0);
+
+ /* Poll for ID change */
+ if (is_otg_enabled(musb) && musb->xceiv.state == OTG_STATE_B_IDLE)
+ mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ);
+
+ spin_unlock_irqrestore(&musb->lock, flags);
+
+ if (ret != IRQ_HANDLED) {
+ if (status)
+ /*
+ * We sometimes get unhandled IRQs in the peripheral
+ * mode from EP0 and SOF...
+ */
+ ERR("Unhandled USB IRQ %08x\n", status);
+ else if (printk_ratelimit())
+ /*
+ * We've seen series of spurious interrupts in the
+ * peripheral mode after USB reset and then after some
+ * time a real interrupt storm starting...
+ */
+ ERR("Spurious IRQ, CPPI 4.1 status %08x\n" , pend0);
+ }
+ return ret;
+}
+
+int musb_platform_set_mode(struct musb *musb, u8 musb_mode)
+{
+ u32 cfgchip2 = __raw_readl(CFGCHIP2);
+
+ cfgchip2 &= ~CFGCHIP2_OTGMODE;
+ switch (musb_mode) {
+#ifdef CONFIG_USB_MUSB_HDRC_HCD
+ case MUSB_HOST: /* Force VBUS valid, ID = 0 */
+ cfgchip2 |= CFGCHIP2_FORCE_HOST;
+ break;
+#endif
+#ifdef CONFIG_USB_GADGET_MUSB_HDRC
+ case MUSB_PERIPHERAL: /* Force VBUS valid, ID = 1 */
+ cfgchip2 |= CFGCHIP2_FORCE_DEVICE;
+ break;
+#endif
+#ifdef CONFIG_USB_MUSB_OTG
+ case MUSB_OTG: /* Don't override the VBUS/ID comparators */
+ cfgchip2 |= CFGCHIP2_NO_OVERRIDE;
+ break;
+#endif
+ default:
+ DBG(2, "Trying to set unsupported mode %u\n", musb_mode);
+ }
+
+ __raw_writel(cfgchip2, CFGCHIP2);
+ return 0;
+}
+
+int __init musb_platform_init(struct musb *musb)
+{
+ void __iomem *reg_base = musb->ctrl_base;
+ u32 rev;
+
+ musb->mregs += USB_MENTOR_CORE_OFFSET;
+
+ musb->clock = clk_get(NULL, "USB20CLK");
+ if (IS_ERR(musb->clock))
+ return PTR_ERR(musb->clock);
+
+ if (clk_enable(musb->clock) < 0)
+ return -ENODEV;
+
+ /* Returns zero if e.g. not clocked */
+ rev = musb_readl(reg_base, USB_REVISION_REG);
+ if (!rev)
+ return -ENODEV;
+
+ if (is_host_enabled(musb))
+ setup_timer(&otg_workaround, otg_timer, (unsigned long) musb);
+
+ musb->board_set_vbus = da830_set_vbus;
+
+ /* Reset the controller */
+ musb_writel(reg_base, USB_CTRL_REG, USB_SOFT_RESET_MASK);
+
+ /* Start the on-chip PHY and its PLL. */
+ phy_on();
+
+ msleep(5);
+
+ /* NOTE: IRQs are in mixed mode, not bypass to pure MUSB */
+ pr_debug("DA830 OTG revision %08x, PHY %03x, control %02x\n",
+ rev, __raw_readl(IO_ADDRESS(DA830_CFGCHIP(2))),
+ musb_readb(reg_base, USB_CTRL_REG));
+
+ musb->a_wait_bcon = A_WAIT_BCON_TIMEOUT;
+ musb->isr = da830_interrupt;
+ return 0;
+}
+
+int musb_platform_exit(struct musb *musb)
+{
+ if (is_host_enabled(musb))
+ del_timer_sync(&otg_workaround);
+
+ /* Delay to avoid problems with module reload... */
+ if (is_host_enabled(musb) && musb->xceiv.default_a) {
+ u8 devctl, warn = 0;
+ int delay;
+
+ /*
+ * If there's no peripheral connected, VBUS can take a
+ * long time to fall...
+ */
+ for (delay = 30; delay > 0; delay--) {
+ devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
+ if (!(devctl & MUSB_DEVCTL_VBUS))
+ goto done;
+ if ((devctl & MUSB_DEVCTL_VBUS) != warn) {
+ warn = devctl & MUSB_DEVCTL_VBUS;
+ DBG(1, "VBUS %d\n",
+ warn >> MUSB_DEVCTL_VBUS_SHIFT);
+ }
+ msleep(1000);
+ }
+
+ /* In OTG mode, another host might be connected... */
+ DBG(1, "VBUS off timeout (devctl %02x)\n", devctl);
+ }
+done:
+ phy_off();
+ return 0;
+}
Index: linux-davinci/drivers/usb/musb/musb_core.h
===================================================================
--- linux-davinci.orig/drivers/usb/musb/musb_core.h
+++ linux-davinci/drivers/usb/musb/musb_core.h
@@ -535,6 +535,7 @@ extern void musb_hnp_stop(struct musb *m
extern int musb_platform_set_mode(struct musb *musb, u8 musb_mode);
#if defined(CONFIG_USB_TUSB6010) || defined(CONFIG_BLACKFIN) || \
+ defined(CONFIG_ARCH_DAVINCI_DA830) || \
defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP34XX)
extern void musb_platform_try_idle(struct musb *musb, unsigned long timeout);
#else
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