static irqreturn_t davinci_interrupt(int irq, void *__hci)
{
unsigned long flags;
irqreturn_t retval = IRQ_NONE;
struct musb *musb = __hci;
void __iomem *tibase = musb->ctrl_base;
u32 tmp;
spin_lock_irqsave(&musb->lock, flags);
/* NOTE: DaVinci shadows the Mentor IRQs. Don't manage them through
* the Mentor registers (except for setup), use the TI ones and EOI.
*
* Docs describe irq "vector" registers asociated with the CPPI and
* USB EOI registers. These hold a bitmask corresponding to the
* current IRQ, not an irq handler address. Would using those bits
* resolve some of the races observed in this dispatch code??
*/
/* CPPI interrupts share the same IRQ line, but have their own
* mask, state, "vector", and EOI registers.
*/
if (is_cppi_enabled()) {
u32 cppi_tx = musb_readl(tibase, DAVINCI_TXCPPI_MASKED_REG);
u32 cppi_rx = musb_readl(tibase, DAVINCI_RXCPPI_MASKED_REG);
if (cppi_tx || cppi_rx) {
DBG(4, "CPPI IRQ t%x r%x\n", cppi_tx, cppi_rx);
cppi_completion(musb, cppi_rx, cppi_tx);
retval = IRQ_HANDLED;
}
}
/* ack and handle non-CPPI interrupts */
tmp = musb_readl(tibase, DAVINCI_USB_INT_SRC_MASKED_REG);
musb_writel(tibase, DAVINCI_USB_INT_SRC_CLR_REG, tmp);
DBG(4, "IRQ %08x\n", tmp);
musb->int_rx = (tmp & DAVINCI_USB_RXINT_MASK)
>> DAVINCI_USB_RXINT_SHIFT;
musb->int_tx = (tmp & DAVINCI_USB_TXINT_MASK)
>> DAVINCI_USB_TXINT_SHIFT;
musb->int_usb = (tmp & DAVINCI_USB_USBINT_MASK)
>> DAVINCI_USB_USBINT_SHIFT;
/* DRVVBUS irqs are the only proxy we have (a very poor one!) for
* DaVinci'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 we know its
* value, but DEVCTL.BDEVICE is invalid without DEVCTL.SESSION set.
* Also, DRVVBUS pulses for SRP (but not at 5V) ...
*/
if (tmp & (DAVINCI_INTR_DRVVBUS << DAVINCI_USB_USBINT_SHIFT)) {
int drvvbus = musb_readl(tibase, DAVINCI_USB_STAT_REG);
void __iomem *mregs = musb->mregs;
u8 devctl = musb_readb(mregs, MUSB_DEVCTL);
int err = musb->int_usb & MUSB_INTR_VBUSERROR;
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 (on EVM, a **long** time) 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);
WARN("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);
}
/* NOTE: this must complete poweron within 100 msec */
davinci_source_power(musb, drvvbus, 0);
DBG(2, "VBUS %s (%s)%s, devctl %02x\n",
drvvbus ? "on" : "off",
otg_state_string(musb),
err ? " ERROR" : "",
devctl);
retval = IRQ_HANDLED;
}
if (musb->int_tx || musb->int_rx || musb->int_usb)
retval |= musb_interrupt(musb);
/* irq stays asserted until EOI is written */
musb_writel(tibase, DAVINCI_USB_EOI_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);
/* REVISIT we sometimes get unhandled IRQs
* (e.g. ep0). not clear why...
*/
if (retval != IRQ_HANDLED)
DBG(5, "unhandled? %08x\n", tmp);
return IRQ_HANDLED;
}
static irqreturn_t davinci_interrupt(int irq, void *__hci, struct pt_regs *r)
{
unsigned long flags;
irqreturn_t retval = IRQ_NONE;
struct musb *musb = __hci;
void *__iomem tibase = musb->ctrl_base;
u32 tmp;
spin_lock_irqsave(&musb->Lock, flags);
#ifdef CONFIG_USB_TI_CPPI_DMA
/* CPPI interrupts share the same IRQ line, but have their own
* mask, state, and EIO registers.
*/
{
u32 cppi_tx = musb_readl(tibase, DAVINCI_TXCPPI_MASKED_REG);
u32 cppi_rx = musb_readl(tibase, DAVINCI_RXCPPI_MASKED_REG);
if (cppi_tx || cppi_rx) {
DBG(4, "<== CPPI IRQ t%x r%x\n", cppi_tx, cppi_rx);
cppi_completion(musb, cppi_rx, cppi_tx);
retval = IRQ_HANDLED;
}
}
#endif
/* NOTE: DaVinci shadows the Mentor IRQs; don't manage them through
* the mentor registers (except for setup), use the TI ones and EOI.
*/
/* ack and handle non-CPPI interrupts */
tmp = musb_readl(tibase, DAVINCI_USB_INT_SRC_MASKED_REG);
musb_writel(tibase, DAVINCI_USB_INT_SRC_CLR_REG, tmp);
musb->int_rx = (tmp & DAVINCI_USB_RXINT_MASK)
>> DAVINCI_USB_RXINT_SHIFT;
musb->int_tx = (tmp & DAVINCI_USB_TXINT_MASK)
>> DAVINCI_USB_TXINT_SHIFT;
musb->int_usb = (tmp & DAVINCI_USB_USBINT_MASK)
>> DAVINCI_USB_USBINT_SHIFT;
musb->int_regs = r;
if (tmp & (1 << (8 + DAVINCI_USB_USBINT_SHIFT))) {
int drvvbus = musb_readl(tibase, DAVINCI_USB_STAT_REG);
/* NOTE: this must complete poweron within 100 msec */
DBG(1, "drvvbus Interrupt\n");
#ifndef CONFIG_ARCH_DAVINCI_DM355
#ifdef CONFIG_USB_MUSB_OTG
davinci_vbus_power(musb, drvvbus);
#elif defined(CONFIG_USB_MUSB_HDRC_HCD)
/* In host mode manipulate vbus based on core request
* but keep the session on.
*/
davinci_vbus_power(musb, drvvbus);
#endif
#endif
drvvbus = 0;
retval = IRQ_HANDLED;
}
if (musb->int_tx || musb->int_rx || musb->int_usb)
retval |= musb_interrupt(musb);
/* irq stays asserted until EOI is written */
musb_writel(tibase, DAVINCI_USB_EOI_REG, 0);
spin_unlock_irqrestore(&musb->Lock, flags);
/* REVISIT we sometimes get unhandled IRQs with CPPI
* (minimally, host TX). not clear why...
*/
if (retval != IRQ_HANDLED)
DBG(5, "unhandled? %08x\n", tmp);
return IRQ_HANDLED;
}
