--- /dev/null
+/*
+ * Texas Instruments AM35x "glue layer"
+ *
+ * Copyright (c) 2010, by Texas Instruments
+ *
+ * Based on the DA8xx "glue layer" code.
+ * Copyright (c) 2008-2009, MontaVista Software, Inc. <source@mvista.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/init.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <plat/control.h>
+#include <plat/usb.h>
+
+#include "musb_core.h"
+
+/*
+ * AM35x specific definitions
+ */
+/* USB 2.0 OTG module registers */
+#define USB_REVISION_REG 0x00
+#define USB_CTRL_REG 0x04
+#define USB_STAT_REG 0x08
+#define USB_EMULATION_REG 0x0c
+/* 0x10 Reserved */
+#define USB_AUTOREQ_REG 0x14
+#define USB_SRP_FIX_TIME_REG 0x18
+#define USB_TEARDOWN_REG 0x1c
+#define EP_INTR_SRC_REG 0x20
+#define EP_INTR_SRC_SET_REG 0x24
+#define EP_INTR_SRC_CLEAR_REG 0x28
+#define EP_INTR_MASK_REG 0x2c
+#define EP_INTR_MASK_SET_REG 0x30
+#define EP_INTR_MASK_CLEAR_REG 0x34
+#define EP_INTR_SRC_MASKED_REG 0x38
+#define CORE_INTR_SRC_REG 0x40
+#define CORE_INTR_SRC_SET_REG 0x44
+#define CORE_INTR_SRC_CLEAR_REG 0x48
+#define CORE_INTR_MASK_REG 0x4c
+#define CORE_INTR_MASK_SET_REG 0x50
+#define CORE_INTR_MASK_CLEAR_REG 0x54
+#define CORE_INTR_SRC_MASKED_REG 0x58
+/* 0x5c Reserved */
+#define USB_END_OF_INTR_REG 0x60
+
+/* Control register bits */
+#define AM35X_SOFT_RESET_MASK 1
+
+/* USB interrupt register bits */
+#define AM35X_INTR_USB_SHIFT 16
+#define AM35X_INTR_USB_MASK (0x1ff << AM35X_INTR_USB_SHIFT)
+#define AM35X_INTR_DRVVBUS 0x100
+#define AM35X_INTR_RX_SHIFT 16
+#define AM35X_INTR_TX_SHIFT 0
+#define AM35X_TX_EP_MASK 0xffff /* EP0 + 15 Tx EPs */
+#define AM35X_RX_EP_MASK 0xfffe /* 15 Rx EPs */
+#define AM35X_TX_INTR_MASK (AM35X_TX_EP_MASK << AM35X_INTR_TX_SHIFT)
+#define AM35X_RX_INTR_MASK (AM35X_RX_EP_MASK << AM35X_INTR_RX_SHIFT)
+
+#define USB_MENTOR_CORE_OFFSET 0x400
+
+static inline void phy_on(void)
+{
+ unsigned long timeout = jiffies + msecs_to_jiffies(100);
+ u32 devconf2;
+
+ /*
+ * Start the on-chip PHY and its PLL.
+ */
+ devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
+
+ devconf2 &= ~(CONF2_RESET | CONF2_PHYPWRDN | CONF2_OTGPWRDN);
+ devconf2 |= CONF2_PHY_PLLON;
+
+ omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
+
+ DBG(1, "Waiting for PHY clock good...\n");
+ while (!(omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2)
+ & CONF2_PHYCLKGD)) {
+ cpu_relax();
+
+ if (time_after(jiffies, timeout)) {
+ DBG(1, "musb PHY clock good timed out\n");
+ break;
+ }
+ }
+}
+
+static inline void phy_off(void)
+{
+ u32 devconf2;
+
+ /*
+ * Power down the on-chip PHY.
+ */
+ devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
+
+ devconf2 &= ~CONF2_PHY_PLLON;
+ devconf2 |= CONF2_PHYPWRDN | CONF2_OTGPWRDN;
+ omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
+}
+
+/*
+ * musb_platform_enable - enable interrupts
+ */
+void musb_platform_enable(struct musb *musb)
+{
+ void __iomem *reg_base = musb->ctrl_base;
+ u32 epmask;
+
+ /* Workaround: setup IRQs through both register sets. */
+ epmask = ((musb->epmask & AM35X_TX_EP_MASK) << AM35X_INTR_TX_SHIFT) |
+ ((musb->epmask & AM35X_RX_EP_MASK) << AM35X_INTR_RX_SHIFT);
+
+ musb_writel(reg_base, EP_INTR_MASK_SET_REG, epmask);
+ musb_writel(reg_base, CORE_INTR_MASK_SET_REG, AM35X_INTR_USB_MASK);
+
+ /* Force the DRVVBUS IRQ so we can start polling for ID change. */
+ if (is_otg_enabled(musb))
+ musb_writel(reg_base, CORE_INTR_SRC_SET_REG,
+ AM35X_INTR_DRVVBUS << AM35X_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, CORE_INTR_MASK_CLEAR_REG, AM35X_INTR_USB_MASK);
+ musb_writel(reg_base, EP_INTR_MASK_CLEAR_REG,
+ AM35X_TX_INTR_MASK | AM35X_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 am35x_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 AM35x'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:
+ musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
+ musb_writel(musb->ctrl_base, CORE_INTR_SRC_SET_REG,
+ MUSB_INTR_VBUSERROR << AM35X_INTR_USB_SHIFT);
+ break;
+ case OTG_STATE_B_IDLE:
+ if (!is_peripheral_enabled(musb))
+ break;
+
+ 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 am35x_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 epintr, usbintr, lvl_intr;
+
+ spin_lock_irqsave(&musb->lock, flags);
+
+ /* Get endpoint interrupts */
+ epintr = musb_readl(reg_base, EP_INTR_SRC_MASKED_REG);
+
+ if (epintr) {
+ musb_writel(reg_base, EP_INTR_SRC_CLEAR_REG, epintr);
+
+ musb->int_rx =
+ (epintr & AM35X_RX_INTR_MASK) >> AM35X_INTR_RX_SHIFT;
+ musb->int_tx =
+ (epintr & AM35X_TX_INTR_MASK) >> AM35X_INTR_TX_SHIFT;
+ }
+
+ /* Get usb core interrupts */
+ usbintr = musb_readl(reg_base, CORE_INTR_SRC_MASKED_REG);
+ if (!usbintr && !epintr)
+ goto eoi;
+
+ if (usbintr) {
+ musb_writel(reg_base, CORE_INTR_SRC_CLEAR_REG, usbintr);
+
+ musb->int_usb =
+ (usbintr & AM35X_INTR_USB_MASK) >> AM35X_INTR_USB_SHIFT;
+ }
+ /*
+ * DRVVBUS IRQs are the only proxy we have (a very poor one!) for
+ * AM35x'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 5V) ...
+ */
+ if (usbintr & (AM35X_INTR_DRVVBUS << AM35X_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_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);
+ }
+
+ /* NOTE: this must complete power-on within 100 ms. */
+ 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 || epintr || usbintr) {
+ /* clear level interrupt */
+ lvl_intr = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
+ lvl_intr |= AM35XX_USBOTGSS_INT_CLR;
+ omap_ctrl_writel(lvl_intr, AM35XX_CONTROL_LVL_INTR_CLEAR);
+ /* write EOI */
+ 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);
+
+ return ret;
+}
+
+int musb_platform_set_mode(struct musb *musb, u8 musb_mode)
+{
+ u32 devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
+
+ devconf2 &= ~CONF2_OTGMODE;
+ switch (musb_mode) {
+#ifdef CONFIG_USB_MUSB_HDRC_HCD
+ case MUSB_HOST: /* Force VBUS valid, ID = 0 */
+ devconf2 |= CONF2_FORCE_HOST;
+ break;
+#endif
+#ifdef CONFIG_USB_GADGET_MUSB_HDRC
+ case MUSB_PERIPHERAL: /* Force VBUS valid, ID = 1 */
+ devconf2 |= CONF2_FORCE_DEVICE;
+ break;
+#endif
+#ifdef CONFIG_USB_MUSB_OTG
+ case MUSB_OTG: /* Don't override the VBUS/ID comparators */
+ devconf2 |= CONF2_NO_OVERRIDE;
+ break;
+#endif
+ default:
+ DBG(2, "Trying to set unsupported mode %u\n", musb_mode);
+ }
+
+ omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
+ return 0;
+}
+
+int __init musb_platform_init(struct musb *musb, void *board_data)
+{
+ void __iomem *reg_base = musb->ctrl_base;
+ u32 rev, lvl_intr, sw_reset;
+ int status;
+
+ musb->mregs += USB_MENTOR_CORE_OFFSET;
+
+ clk_enable(musb->clock);
+ DBG(2, "musb->clock=%lud\n", clk_get_rate(musb->clock));
+
+ musb->phy_clock = clk_get(musb->controller, "fck");
+ if (IS_ERR(musb->phy_clock)) {
+ status = PTR_ERR(musb->phy_clock);
+ goto exit0;
+ }
+ clk_enable(musb->phy_clock);
+ DBG(2, "musb->phy_clock=%lud\n", clk_get_rate(musb->phy_clock));
+
+ /* Returns zero if e.g. not clocked */
+ rev = musb_readl(reg_base, USB_REVISION_REG);
+ if (!rev) {
+ status = -ENODEV;
+ goto exit1;
+ }
+
+ usb_nop_xceiv_register();
+ musb->xceiv = otg_get_transceiver();
+ if (!musb->xceiv) {
+ status = -ENODEV;
+ goto exit1;
+ }
+
+ if (is_host_enabled(musb))
+ setup_timer(&otg_workaround, otg_timer, (unsigned long) musb);
+
+ musb->board_set_vbus = am35x_set_vbus;
+
+ /* Global reset */
+ sw_reset = omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET);
+
+ sw_reset |= AM35XX_USBOTGSS_SW_RST;
+ omap_ctrl_writel(sw_reset, AM35XX_CONTROL_IP_SW_RESET);
+
+ sw_reset &= ~AM35XX_USBOTGSS_SW_RST;
+ omap_ctrl_writel(sw_reset, AM35XX_CONTROL_IP_SW_RESET);
+
+ /* Reset the controller */
+ musb_writel(reg_base, USB_CTRL_REG, AM35X_SOFT_RESET_MASK);
+
+ /* Start the on-chip PHY and its PLL. */
+ phy_on();
+
+ msleep(5);
+
+ musb->isr = am35x_interrupt;
+
+ /* clear level interrupt */
+ lvl_intr = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
+ lvl_intr |= AM35XX_USBOTGSS_INT_CLR;
+ omap_ctrl_writel(lvl_intr, AM35XX_CONTROL_LVL_INTR_CLEAR);
+ return 0;
+exit1:
+ clk_disable(musb->phy_clock);
+ clk_put(musb->phy_clock);
+exit0:
+ clk_disable(musb->clock);
+ return status;
+}
+
+int musb_platform_exit(struct musb *musb)
+{
+ if (is_host_enabled(musb))
+ del_timer_sync(&otg_workaround);
+
+ phy_off();
+
+ otg_put_transceiver(musb->xceiv);
+ usb_nop_xceiv_unregister();
+
+ clk_disable(musb->clock);
+
+ clk_disable(musb->phy_clock);
+ clk_put(musb->phy_clock);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+void musb_platform_save_context(struct musb *musb,
+ struct musb_context_registers *musb_context)
+{
+ phy_off();
+}
+
+void musb_platform_restore_context(struct musb *musb,
+ struct musb_context_registers *musb_context)
+{
+ phy_on();
+}
+#endif
projects / users / willy / xarray.git / commitdiff