Initial import

1 files changed, 1365 insertions, 0 deletions

diff --git a/arch/blackfin/mach-common/ints-priority.c b/arch/blackfin/mach-common/ints-priority.c
new file mode 100644
index 000000000..7236bdfc7
--- /dev/null
+++ b/arch/blackfin/mach-common/ints-priority.c
@@ -0,0 +1,1365 @@
+/*
+ * Set up the interrupt priorities
+ *
+ * Copyright  2004-2009 Analog Devices Inc.
+ *                 2003 Bas Vermeulen <bas@buyways.nl>
+ *                 2002 Arcturus Networks Inc. MaTed <mated@sympatico.ca>
+ *            2000-2001 Lineo, Inc. D. Jefff Dionne <jeff@lineo.ca>
+ *                 1999 D. Jeff Dionne <jeff@uclinux.org>
+ *                 1996 Roman Zippel
+ *
+ * Licensed under the GPL-2
+ */
+
+#include <linux/module.h>
+#include <linux/kernel_stat.h>
+#include <linux/seq_file.h>
+#include <linux/irq.h>
+#include <linux/sched.h>
+#include <linux/syscore_ops.h>
+#include <asm/delay.h>
+#ifdef CONFIG_IPIPE
+#include <linux/ipipe.h>
+#endif
+#include <asm/traps.h>
+#include <asm/blackfin.h>
+#include <asm/gpio.h>
+#include <asm/irq_handler.h>
+#include <asm/dpmc.h>
+#include <asm/traps.h>
+
+/*
+ * NOTES:
+ * - we have separated the physical Hardware interrupt from the
+ * levels that the LINUX kernel sees (see the description in irq.h)
+ * -
+ */
+
+#ifndef CONFIG_SMP
+/* Initialize this to an actual value to force it into the .data
+ * section so that we know it is properly initialized at entry into
+ * the kernel but before bss is initialized to zero (which is where
+ * it would live otherwise).  The 0x1f magic represents the IRQs we
+ * cannot actually mask out in hardware.
+ */
+unsigned long bfin_irq_flags = 0x1f;
+EXPORT_SYMBOL(bfin_irq_flags);
+#endif
+
+#ifdef CONFIG_PM
+unsigned long bfin_sic_iwr[3];	/* Up to 3 SIC_IWRx registers */
+unsigned vr_wakeup;
+#endif
+
+#ifndef SEC_GCTL
+static struct ivgx {
+	/* irq number for request_irq, available in mach-bf5xx/irq.h */
+	unsigned int irqno;
+	/* corresponding bit in the SIC_ISR register */
+	unsigned int isrflag;
+} ivg_table[NR_PERI_INTS];
+
+static struct ivg_slice {
+	/* position of first irq in ivg_table for given ivg */
+	struct ivgx *ifirst;
+	struct ivgx *istop;
+} ivg7_13[IVG13 - IVG7 + 1];
+
+
+/*
+ * Search SIC_IAR and fill tables with the irqvalues
+ * and their positions in the SIC_ISR register.
+ */
+static void __init search_IAR(void)
+{
+	unsigned ivg, irq_pos = 0;
+	for (ivg = 0; ivg <= IVG13 - IVG7; ivg++) {
+		int irqN;
+
+		ivg7_13[ivg].istop = ivg7_13[ivg].ifirst = &ivg_table[irq_pos];
+
+		for (irqN = 0; irqN < NR_PERI_INTS; irqN += 4) {
+			int irqn;
+			u32 iar =
+				bfin_read32((unsigned long *)SIC_IAR0 +
+#if defined(CONFIG_BF51x) || defined(CONFIG_BF52x) || \
+	defined(CONFIG_BF538) || defined(CONFIG_BF539)
+				((irqN % 32) >> 3) + ((irqN / 32) * ((SIC_IAR4 - SIC_IAR0) / 4))
+#else
+				(irqN >> 3)
+#endif
+				);
+			for (irqn = irqN; irqn < irqN + 4; ++irqn) {
+				int iar_shift = (irqn & 7) * 4;
+				if (ivg == (0xf & (iar >> iar_shift))) {
+					ivg_table[irq_pos].irqno = IVG7 + irqn;
+					ivg_table[irq_pos].isrflag = 1 << (irqn % 32);
+					ivg7_13[ivg].istop++;
+					irq_pos++;
+				}
+			}
+		}
+	}
+}
+#endif
+
+/*
+ * This is for core internal IRQs
+ */
+void bfin_ack_noop(struct irq_data *d)
+{
+	/* Dummy function.  */
+}
+
+static void bfin_core_mask_irq(struct irq_data *d)
+{
+	bfin_irq_flags &= ~(1 << d->irq);
+	if (!hard_irqs_disabled())
+		hard_local_irq_enable();
+}
+
+static void bfin_core_unmask_irq(struct irq_data *d)
+{
+	bfin_irq_flags |= 1 << d->irq;
+	/*
+	 * If interrupts are enabled, IMASK must contain the same value
+	 * as bfin_irq_flags.  Make sure that invariant holds.  If interrupts
+	 * are currently disabled we need not do anything; one of the
+	 * callers will take care of setting IMASK to the proper value
+	 * when reenabling interrupts.
+	 * local_irq_enable just does "STI bfin_irq_flags", so it's exactly
+	 * what we need.
+	 */
+	if (!hard_irqs_disabled())
+		hard_local_irq_enable();
+	return;
+}
+
+#ifndef SEC_GCTL
+void bfin_internal_mask_irq(unsigned int irq)
+{
+	unsigned long flags = hard_local_irq_save();
+#ifdef SIC_IMASK0
+	unsigned mask_bank = BFIN_SYSIRQ(irq) / 32;
+	unsigned mask_bit = BFIN_SYSIRQ(irq) % 32;
+	bfin_write_SIC_IMASK(mask_bank, bfin_read_SIC_IMASK(mask_bank) &
+			~(1 << mask_bit));
+# if defined(CONFIG_SMP) || defined(CONFIG_ICC)
+	bfin_write_SICB_IMASK(mask_bank, bfin_read_SICB_IMASK(mask_bank) &
+			~(1 << mask_bit));
+# endif
+#else
+	bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() &
+			~(1 << BFIN_SYSIRQ(irq)));
+#endif /* end of SIC_IMASK0 */
+	hard_local_irq_restore(flags);
+}
+
+static void bfin_internal_mask_irq_chip(struct irq_data *d)
+{
+	bfin_internal_mask_irq(d->irq);
+}
+
+#ifdef CONFIG_SMP
+void bfin_internal_unmask_irq_affinity(unsigned int irq,
+		const struct cpumask *affinity)
+#else
+void bfin_internal_unmask_irq(unsigned int irq)
+#endif
+{
+	unsigned long flags = hard_local_irq_save();
+
+#ifdef SIC_IMASK0
+	unsigned mask_bank = BFIN_SYSIRQ(irq) / 32;
+	unsigned mask_bit = BFIN_SYSIRQ(irq) % 32;
+# ifdef CONFIG_SMP
+	if (cpumask_test_cpu(0, affinity))
+# endif
+		bfin_write_SIC_IMASK(mask_bank,
+				bfin_read_SIC_IMASK(mask_bank) |
+				(1 << mask_bit));
+# ifdef CONFIG_SMP
+	if (cpumask_test_cpu(1, affinity))
+		bfin_write_SICB_IMASK(mask_bank,
+				bfin_read_SICB_IMASK(mask_bank) |
+				(1 << mask_bit));
+# endif
+#else
+	bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() |
+			(1 << BFIN_SYSIRQ(irq)));
+#endif
+	hard_local_irq_restore(flags);
+}
+
+#ifdef CONFIG_SMP
+static void bfin_internal_unmask_irq_chip(struct irq_data *d)
+{
+	bfin_internal_unmask_irq_affinity(d->irq, d->affinity);
+}
+
+static int bfin_internal_set_affinity(struct irq_data *d,
+				      const struct cpumask *mask, bool force)
+{
+	bfin_internal_mask_irq(d->irq);
+	bfin_internal_unmask_irq_affinity(d->irq, mask);
+
+	return 0;
+}
+#else
+static void bfin_internal_unmask_irq_chip(struct irq_data *d)
+{
+	bfin_internal_unmask_irq(d->irq);
+}
+#endif
+
+#if defined(CONFIG_PM)
+int bfin_internal_set_wake(unsigned int irq, unsigned int state)
+{
+	u32 bank, bit, wakeup = 0;
+	unsigned long flags;
+	bank = BFIN_SYSIRQ(irq) / 32;
+	bit = BFIN_SYSIRQ(irq) % 32;
+
+	switch (irq) {
+#ifdef IRQ_RTC
+	case IRQ_RTC:
+	wakeup |= WAKE;
+	break;
+#endif
+#ifdef IRQ_CAN0_RX
+	case IRQ_CAN0_RX:
+	wakeup |= CANWE;
+	break;
+#endif
+#ifdef IRQ_CAN1_RX
+	case IRQ_CAN1_RX:
+	wakeup |= CANWE;
+	break;
+#endif
+#ifdef IRQ_USB_INT0
+	case IRQ_USB_INT0:
+	wakeup |= USBWE;
+	break;
+#endif
+#ifdef CONFIG_BF54x
+	case IRQ_CNT:
+	wakeup |= ROTWE;
+	break;
+#endif
+	default:
+	break;
+	}
+
+	flags = hard_local_irq_save();
+
+	if (state) {
+		bfin_sic_iwr[bank] |= (1 << bit);
+		vr_wakeup  |= wakeup;
+
+	} else {
+		bfin_sic_iwr[bank] &= ~(1 << bit);
+		vr_wakeup  &= ~wakeup;
+	}
+
+	hard_local_irq_restore(flags);
+
+	return 0;
+}
+
+static int bfin_internal_set_wake_chip(struct irq_data *d, unsigned int state)
+{
+	return bfin_internal_set_wake(d->irq, state);
+}
+#else
+inline int bfin_internal_set_wake(unsigned int irq, unsigned int state)
+{
+	return 0;
+}
+# define bfin_internal_set_wake_chip NULL
+#endif
+
+#else /* SEC_GCTL */
+static void bfin_sec_preflow_handler(struct irq_data *d)
+{
+	unsigned long flags = hard_local_irq_save();
+	unsigned int sid = BFIN_SYSIRQ(d->irq);
+
+	bfin_write_SEC_SCI(0, SEC_CSID, sid);
+
+	hard_local_irq_restore(flags);
+}
+
+static void bfin_sec_mask_ack_irq(struct irq_data *d)
+{
+	unsigned long flags = hard_local_irq_save();
+	unsigned int sid = BFIN_SYSIRQ(d->irq);
+
+	bfin_write_SEC_SCI(0, SEC_CSID, sid);
+
+	hard_local_irq_restore(flags);
+}
+
+static void bfin_sec_unmask_irq(struct irq_data *d)
+{
+	unsigned long flags = hard_local_irq_save();
+	unsigned int sid = BFIN_SYSIRQ(d->irq);
+
+	bfin_write32(SEC_END, sid);
+
+	hard_local_irq_restore(flags);
+}
+
+static void bfin_sec_enable_ssi(unsigned int sid)
+{
+	unsigned long flags = hard_local_irq_save();
+	uint32_t reg_sctl = bfin_read_SEC_SCTL(sid);
+
+	reg_sctl |= SEC_SCTL_SRC_EN;
+	bfin_write_SEC_SCTL(sid, reg_sctl);
+
+	hard_local_irq_restore(flags);
+}
+
+static void bfin_sec_disable_ssi(unsigned int sid)
+{
+	unsigned long flags = hard_local_irq_save();
+	uint32_t reg_sctl = bfin_read_SEC_SCTL(sid);
+
+	reg_sctl &= ((uint32_t)~SEC_SCTL_SRC_EN);
+	bfin_write_SEC_SCTL(sid, reg_sctl);
+
+	hard_local_irq_restore(flags);
+}
+
+static void bfin_sec_set_ssi_coreid(unsigned int sid, unsigned int coreid)
+{
+	unsigned long flags = hard_local_irq_save();
+	uint32_t reg_sctl = bfin_read_SEC_SCTL(sid);
+
+	reg_sctl &= ((uint32_t)~SEC_SCTL_CTG);
+	bfin_write_SEC_SCTL(sid, reg_sctl | ((coreid << 20) & SEC_SCTL_CTG));
+
+	hard_local_irq_restore(flags);
+}
+
+static void bfin_sec_enable_sci(unsigned int sid)
+{
+	unsigned long flags = hard_local_irq_save();
+	uint32_t reg_sctl = bfin_read_SEC_SCTL(sid);
+
+	if (sid == BFIN_SYSIRQ(IRQ_WATCH0))
+		reg_sctl |= SEC_SCTL_FAULT_EN;
+	else
+		reg_sctl |= SEC_SCTL_INT_EN;
+	bfin_write_SEC_SCTL(sid, reg_sctl);
+
+	hard_local_irq_restore(flags);
+}
+
+static void bfin_sec_disable_sci(unsigned int sid)
+{
+	unsigned long flags = hard_local_irq_save();
+	uint32_t reg_sctl = bfin_read_SEC_SCTL(sid);
+
+	reg_sctl &= ((uint32_t)~SEC_SCTL_INT_EN);
+	bfin_write_SEC_SCTL(sid, reg_sctl);
+
+	hard_local_irq_restore(flags);
+}
+
+static void bfin_sec_enable(struct irq_data *d)
+{
+	unsigned long flags = hard_local_irq_save();
+	unsigned int sid = BFIN_SYSIRQ(d->irq);
+
+	bfin_sec_enable_sci(sid);
+	bfin_sec_enable_ssi(sid);
+
+	hard_local_irq_restore(flags);
+}
+
+static void bfin_sec_disable(struct irq_data *d)
+{
+	unsigned long flags = hard_local_irq_save();
+	unsigned int sid = BFIN_SYSIRQ(d->irq);
+
+	bfin_sec_disable_sci(sid);
+	bfin_sec_disable_ssi(sid);
+
+	hard_local_irq_restore(flags);
+}
+
+static void bfin_sec_set_priority(unsigned int sec_int_levels, u8 *sec_int_priority)
+{
+	unsigned long flags = hard_local_irq_save();
+	uint32_t reg_sctl;
+	int i;
+
+	bfin_write_SEC_SCI(0, SEC_CPLVL, sec_int_levels);
+
+	for (i = 0; i < SYS_IRQS - BFIN_IRQ(0); i++) {
+		reg_sctl = bfin_read_SEC_SCTL(i) & ~SEC_SCTL_PRIO;
+		reg_sctl |= sec_int_priority[i] << SEC_SCTL_PRIO_OFFSET;
+		bfin_write_SEC_SCTL(i, reg_sctl);
+	}
+
+	hard_local_irq_restore(flags);
+}
+
+void bfin_sec_raise_irq(unsigned int irq)
+{
+	unsigned long flags = hard_local_irq_save();
+	unsigned int sid = BFIN_SYSIRQ(irq);
+
+	bfin_write32(SEC_RAISE, sid);
+
+	hard_local_irq_restore(flags);
+}
+
+static void init_software_driven_irq(void)
+{
+	bfin_sec_set_ssi_coreid(34, 0);
+	bfin_sec_set_ssi_coreid(35, 1);
+
+	bfin_sec_enable_sci(35);
+	bfin_sec_enable_ssi(35);
+	bfin_sec_set_ssi_coreid(36, 0);
+	bfin_sec_set_ssi_coreid(37, 1);
+	bfin_sec_enable_sci(37);
+	bfin_sec_enable_ssi(37);
+}
+
+void handle_sec_sfi_fault(uint32_t gstat)
+{
+
+}
+
+void handle_sec_sci_fault(uint32_t gstat)
+{
+	uint32_t core_id;
+	uint32_t cstat;
+
+	core_id = gstat & SEC_GSTAT_SCI;
+	cstat = bfin_read_SEC_SCI(core_id, SEC_CSTAT);
+	if (cstat & SEC_CSTAT_ERR) {
+		switch (cstat & SEC_CSTAT_ERRC) {
+		case SEC_CSTAT_ACKERR:
+			printk(KERN_DEBUG "sec ack err\n");
+			break;
+		default:
+			printk(KERN_DEBUG "sec sci unknown err\n");
+		}
+	}
+
+}
+
+void handle_sec_ssi_fault(uint32_t gstat)
+{
+	uint32_t sid;
+	uint32_t sstat;
+
+	sid = gstat & SEC_GSTAT_SID;
+	sstat = bfin_read_SEC_SSTAT(sid);
+
+}
+
+void handle_sec_fault(uint32_t sec_gstat)
+{
+	if (sec_gstat & SEC_GSTAT_ERR) {
+
+		switch (sec_gstat & SEC_GSTAT_ERRC) {
+		case 0:
+			handle_sec_sfi_fault(sec_gstat);
+			break;
+		case SEC_GSTAT_SCIERR:
+			handle_sec_sci_fault(sec_gstat);
+			break;
+		case SEC_GSTAT_SSIERR:
+			handle_sec_ssi_fault(sec_gstat);
+			break;
+		}
+
+
+	}
+}
+
+static struct irqaction bfin_fault_irq = {
+	.name = "Blackfin fault",
+};
+
+static irqreturn_t bfin_fault_routine(int irq, void *data)
+{
+	struct pt_regs *fp = get_irq_regs();
+
+	switch (irq) {
+	case IRQ_C0_DBL_FAULT:
+		double_fault_c(fp);
+		break;
+	case IRQ_C0_HW_ERR:
+		dump_bfin_process(fp);
+		dump_bfin_mem(fp);
+		show_regs(fp);
+		printk(KERN_NOTICE "Kernel Stack\n");
+		show_stack(current, NULL);
+		print_modules();
+		panic("Core 0 hardware error");
+		break;
+	case IRQ_C0_NMI_L1_PARITY_ERR:
+		panic("Core 0 NMI L1 parity error");
+		break;
+	case IRQ_SEC_ERR:
+		pr_err("SEC error\n");
+		handle_sec_fault(bfin_read32(SEC_GSTAT));
+		break;
+	default:
+		panic("Unknown fault %d", irq);
+	}
+
+	return IRQ_HANDLED;
+}
+#endif /* SEC_GCTL */
+
+static struct irq_chip bfin_core_irqchip = {
+	.name = "CORE",
+	.irq_mask = bfin_core_mask_irq,
+	.irq_unmask = bfin_core_unmask_irq,
+};
+
+#ifndef SEC_GCTL
+static struct irq_chip bfin_internal_irqchip = {
+	.name = "INTN",
+	.irq_mask = bfin_internal_mask_irq_chip,
+	.irq_unmask = bfin_internal_unmask_irq_chip,
+	.irq_disable = bfin_internal_mask_irq_chip,
+	.irq_enable = bfin_internal_unmask_irq_chip,
+#ifdef CONFIG_SMP
+	.irq_set_affinity = bfin_internal_set_affinity,
+#endif
+	.irq_set_wake = bfin_internal_set_wake_chip,
+};
+#else
+static struct irq_chip bfin_sec_irqchip = {
+	.name = "SEC",
+	.irq_mask_ack = bfin_sec_mask_ack_irq,
+	.irq_mask = bfin_sec_mask_ack_irq,
+	.irq_unmask = bfin_sec_unmask_irq,
+	.irq_eoi = bfin_sec_unmask_irq,
+	.irq_disable = bfin_sec_disable,
+	.irq_enable = bfin_sec_enable,
+};
+#endif
+
+void bfin_handle_irq(unsigned irq)
+{
+#ifdef CONFIG_IPIPE
+	struct pt_regs regs;    /* Contents not used. */
+	ipipe_trace_irq_entry(irq);
+	__ipipe_handle_irq(irq, &regs);
+	ipipe_trace_irq_exit(irq);
+#else /* !CONFIG_IPIPE */
+	generic_handle_irq(irq);
+#endif  /* !CONFIG_IPIPE */
+}
+
+#if defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE)
+static int mac_stat_int_mask;
+
+static void bfin_mac_status_ack_irq(unsigned int irq)
+{
+	switch (irq) {
+	case IRQ_MAC_MMCINT:
+		bfin_write_EMAC_MMC_TIRQS(
+			bfin_read_EMAC_MMC_TIRQE() &
+			bfin_read_EMAC_MMC_TIRQS());
+		bfin_write_EMAC_MMC_RIRQS(
+			bfin_read_EMAC_MMC_RIRQE() &
+			bfin_read_EMAC_MMC_RIRQS());
+		break;
+	case IRQ_MAC_RXFSINT:
+		bfin_write_EMAC_RX_STKY(
+			bfin_read_EMAC_RX_IRQE() &
+			bfin_read_EMAC_RX_STKY());
+		break;
+	case IRQ_MAC_TXFSINT:
+		bfin_write_EMAC_TX_STKY(
+			bfin_read_EMAC_TX_IRQE() &
+			bfin_read_EMAC_TX_STKY());
+		break;
+	case IRQ_MAC_WAKEDET:
+		 bfin_write_EMAC_WKUP_CTL(
+			bfin_read_EMAC_WKUP_CTL() | MPKS | RWKS);
+		break;
+	default:
+		/* These bits are W1C */
+		bfin_write_EMAC_SYSTAT(1L << (irq - IRQ_MAC_PHYINT));
+		break;
+	}
+}
+
+static void bfin_mac_status_mask_irq(struct irq_data *d)
+{
+	unsigned int irq = d->irq;
+
+	mac_stat_int_mask &= ~(1L << (irq - IRQ_MAC_PHYINT));
+#ifdef BF537_FAMILY
+	switch (irq) {
+	case IRQ_MAC_PHYINT:
+		bfin_write_EMAC_SYSCTL(bfin_read_EMAC_SYSCTL() & ~PHYIE);
+		break;
+	default:
+		break;
+	}
+#else
+	if (!mac_stat_int_mask)
+		bfin_internal_mask_irq(IRQ_MAC_ERROR);
+#endif
+	bfin_mac_status_ack_irq(irq);
+}
+
+static void bfin_mac_status_unmask_irq(struct irq_data *d)
+{
+	unsigned int irq = d->irq;
+
+#ifdef BF537_FAMILY
+	switch (irq) {
+	case IRQ_MAC_PHYINT:
+		bfin_write_EMAC_SYSCTL(bfin_read_EMAC_SYSCTL() | PHYIE);
+		break;
+	default:
+		break;
+	}
+#else
+	if (!mac_stat_int_mask)
+		bfin_internal_unmask_irq(IRQ_MAC_ERROR);
+#endif
+	mac_stat_int_mask |= 1L << (irq - IRQ_MAC_PHYINT);
+}
+
+#ifdef CONFIG_PM
+int bfin_mac_status_set_wake(struct irq_data *d, unsigned int state)
+{
+#ifdef BF537_FAMILY
+	return bfin_internal_set_wake(IRQ_GENERIC_ERROR, state);
+#else
+	return bfin_internal_set_wake(IRQ_MAC_ERROR, state);
+#endif
+}
+#else
+# define bfin_mac_status_set_wake NULL
+#endif
+
+static struct irq_chip bfin_mac_status_irqchip = {
+	.name = "MACST",
+	.irq_mask = bfin_mac_status_mask_irq,
+	.irq_unmask = bfin_mac_status_unmask_irq,
+	.irq_set_wake = bfin_mac_status_set_wake,
+};
+
+void bfin_demux_mac_status_irq(unsigned int int_err_irq,
+			       struct irq_desc *inta_desc)
+{
+	int i, irq = 0;
+	u32 status = bfin_read_EMAC_SYSTAT();
+
+	for (i = 0; i <= (IRQ_MAC_STMDONE - IRQ_MAC_PHYINT); i++)
+		if (status & (1L << i)) {
+			irq = IRQ_MAC_PHYINT + i;
+			break;
+		}
+
+	if (irq) {
+		if (mac_stat_int_mask & (1L << (irq - IRQ_MAC_PHYINT))) {
+			bfin_handle_irq(irq);
+		} else {
+			bfin_mac_status_ack_irq(irq);
+			pr_debug("IRQ %d:"
+					" MASKED MAC ERROR INTERRUPT ASSERTED\n",
+					irq);
+		}
+	} else
+		printk(KERN_ERR
+				"%s : %s : LINE %d :\nIRQ ?: MAC ERROR"
+				" INTERRUPT ASSERTED BUT NO SOURCE FOUND"
+				"(EMAC_SYSTAT=0x%X)\n",
+				__func__, __FILE__, __LINE__, status);
+}
+#endif
+
+static inline void bfin_set_irq_handler(unsigned irq, irq_flow_handler_t handle)
+{
+#ifdef CONFIG_IPIPE
+	handle = handle_level_irq;
+#endif
+	__irq_set_handler_locked(irq, handle);
+}
+
+#ifdef CONFIG_GPIO_ADI
+
+static DECLARE_BITMAP(gpio_enabled, MAX_BLACKFIN_GPIOS);
+
+static void bfin_gpio_ack_irq(struct irq_data *d)
+{
+	/* AFAIK ack_irq in case mask_ack is provided
+	 * get's only called for edge sense irqs
+	 */
+	set_gpio_data(irq_to_gpio(d->irq), 0);
+}
+
+static void bfin_gpio_mask_ack_irq(struct irq_data *d)
+{
+	unsigned int irq = d->irq;
+	u32 gpionr = irq_to_gpio(irq);
+
+	if (!irqd_is_level_type(d))
+		set_gpio_data(gpionr, 0);
+
+	set_gpio_maska(gpionr, 0);
+}
+
+static void bfin_gpio_mask_irq(struct irq_data *d)
+{
+	set_gpio_maska(irq_to_gpio(d->irq), 0);
+}
+
+static void bfin_gpio_unmask_irq(struct irq_data *d)
+{
+	set_gpio_maska(irq_to_gpio(d->irq), 1);
+}
+
+static unsigned int bfin_gpio_irq_startup(struct irq_data *d)
+{
+	u32 gpionr = irq_to_gpio(d->irq);
+
+	if (__test_and_set_bit(gpionr, gpio_enabled))
+		bfin_gpio_irq_prepare(gpionr);
+
+	bfin_gpio_unmask_irq(d);
+
+	return 0;
+}
+
+static void bfin_gpio_irq_shutdown(struct irq_data *d)
+{
+	u32 gpionr = irq_to_gpio(d->irq);
+
+	bfin_gpio_mask_irq(d);
+	__clear_bit(gpionr, gpio_enabled);
+	bfin_gpio_irq_free(gpionr);
+}
+
+static int bfin_gpio_irq_type(struct irq_data *d, unsigned int type)
+{
+	unsigned int irq = d->irq;
+	int ret;
+	char buf[16];
+	u32 gpionr = irq_to_gpio(irq);
+
+	if (type == IRQ_TYPE_PROBE) {
+		/* only probe unenabled GPIO interrupt lines */
+		if (test_bit(gpionr, gpio_enabled))
+			return 0;
+		type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
+	}
+
+	if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
+		    IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
+
+		snprintf(buf, 16, "gpio-irq%d", irq);
+		ret = bfin_gpio_irq_request(gpionr, buf);
+		if (ret)
+			return ret;
+
+		if (__test_and_set_bit(gpionr, gpio_enabled))
+			bfin_gpio_irq_prepare(gpionr);
+
+	} else {
+		__clear_bit(gpionr, gpio_enabled);
+		return 0;
+	}
+
+	set_gpio_inen(gpionr, 0);
+	set_gpio_dir(gpionr, 0);
+
+	if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
+	    == (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
+		set_gpio_both(gpionr, 1);
+	else
+		set_gpio_both(gpionr, 0);
+
+	if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
+		set_gpio_polar(gpionr, 1);	/* low or falling edge denoted by one */
+	else
+		set_gpio_polar(gpionr, 0);	/* high or rising edge denoted by zero */
+
+	if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
+		set_gpio_edge(gpionr, 1);
+		set_gpio_inen(gpionr, 1);
+		set_gpio_data(gpionr, 0);
+
+	} else {
+		set_gpio_edge(gpionr, 0);
+		set_gpio_inen(gpionr, 1);
+	}
+
+	if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
+		bfin_set_irq_handler(irq, handle_edge_irq);
+	else
+		bfin_set_irq_handler(irq, handle_level_irq);
+
+	return 0;
+}
+
+static void bfin_demux_gpio_block(unsigned int irq)
+{
+	unsigned int gpio, mask;
+
+	gpio = irq_to_gpio(irq);
+	mask = get_gpiop_data(gpio) & get_gpiop_maska(gpio);
+
+	while (mask) {
+		if (mask & 1)
+			bfin_handle_irq(irq);
+		irq++;
+		mask >>= 1;
+	}
+}
+
+void bfin_demux_gpio_irq(unsigned int inta_irq,
+			struct irq_desc *desc)
+{
+	unsigned int irq;
+
+	switch (inta_irq) {
+#if defined(BF537_FAMILY)
+	case IRQ_PF_INTA_PG_INTA:
+		bfin_demux_gpio_block(IRQ_PF0);
+		irq = IRQ_PG0;
+		break;
+	case IRQ_PH_INTA_MAC_RX:
+		irq = IRQ_PH0;
+		break;
+#elif defined(BF533_FAMILY)
+	case IRQ_PROG_INTA:
+		irq = IRQ_PF0;
+		break;
+#elif defined(BF538_FAMILY)
+	case IRQ_PORTF_INTA:
+		irq = IRQ_PF0;
+		break;
+#elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
+	case IRQ_PORTF_INTA:
+		irq = IRQ_PF0;
+		break;
+	case IRQ_PORTG_INTA:
+		irq = IRQ_PG0;
+		break;
+	case IRQ_PORTH_INTA:
+		irq = IRQ_PH0;
+		break;
+#elif defined(CONFIG_BF561)
+	case IRQ_PROG0_INTA:
+		irq = IRQ_PF0;
+		break;
+	case IRQ_PROG1_INTA:
+		irq = IRQ_PF16;
+		break;
+	case IRQ_PROG2_INTA:
+		irq = IRQ_PF32;
+		break;
+#endif
+	default:
+		BUG();
+		return;
+	}
+
+	bfin_demux_gpio_block(irq);
+}
+
+#ifdef CONFIG_PM
+
+static int bfin_gpio_set_wake(struct irq_data *d, unsigned int state)
+{
+	return bfin_gpio_pm_wakeup_ctrl(irq_to_gpio(d->irq), state);
+}
+
+#else
+
+# define bfin_gpio_set_wake NULL
+
+#endif
+
+static struct irq_chip bfin_gpio_irqchip = {
+	.name = "GPIO",
+	.irq_ack = bfin_gpio_ack_irq,
+	.irq_mask = bfin_gpio_mask_irq,
+	.irq_mask_ack = bfin_gpio_mask_ack_irq,
+	.irq_unmask = bfin_gpio_unmask_irq,
+	.irq_disable = bfin_gpio_mask_irq,
+	.irq_enable = bfin_gpio_unmask_irq,
+	.irq_set_type = bfin_gpio_irq_type,
+	.irq_startup = bfin_gpio_irq_startup,
+	.irq_shutdown = bfin_gpio_irq_shutdown,
+	.irq_set_wake = bfin_gpio_set_wake,
+};
+
+#endif
+
+#ifdef CONFIG_PM
+
+#ifdef SEC_GCTL
+static u32 save_pint_sec_ctl[NR_PINT_SYS_IRQS];
+
+static int sec_suspend(void)
+{
+	u32 bank;
+
+	for (bank = 0; bank < NR_PINT_SYS_IRQS; bank++)
+		save_pint_sec_ctl[bank] = bfin_read_SEC_SCTL(bank + BFIN_SYSIRQ(IRQ_PINT0));
+	return 0;
+}
+
+static void sec_resume(void)
+{
+	u32 bank;
+
+	bfin_write_SEC_SCI(0, SEC_CCTL, SEC_CCTL_RESET);
+	udelay(100);
+	bfin_write_SEC_GCTL(SEC_GCTL_EN);
+	bfin_write_SEC_SCI(0, SEC_CCTL, SEC_CCTL_EN | SEC_CCTL_NMI_EN);
+
+	for (bank = 0; bank < NR_PINT_SYS_IRQS; bank++)
+		bfin_write_SEC_SCTL(bank + BFIN_SYSIRQ(IRQ_PINT0), save_pint_sec_ctl[bank]);
+}
+
+static struct syscore_ops sec_pm_syscore_ops = {
+	.suspend = sec_suspend,
+	.resume = sec_resume,
+};
+#endif
+
+#endif
+
+void init_exception_vectors(void)
+{
+	/* cannot program in software:
+	 * evt0 - emulation (jtag)
+	 * evt1 - reset
+	 */
+	bfin_write_EVT2(evt_nmi);
+	bfin_write_EVT3(trap);
+	bfin_write_EVT5(evt_ivhw);
+	bfin_write_EVT6(evt_timer);
+	bfin_write_EVT7(evt_evt7);
+	bfin_write_EVT8(evt_evt8);
+	bfin_write_EVT9(evt_evt9);
+	bfin_write_EVT10(evt_evt10);
+	bfin_write_EVT11(evt_evt11);
+	bfin_write_EVT12(evt_evt12);
+	bfin_write_EVT13(evt_evt13);
+	bfin_write_EVT14(evt_evt14);
+	bfin_write_EVT15(evt_system_call);
+	CSYNC();
+}
+
+#ifndef SEC_GCTL
+/*
+ * This function should be called during kernel startup to initialize
+ * the BFin IRQ handling routines.
+ */
+
+int __init init_arch_irq(void)
+{
+	int irq;
+	unsigned long ilat = 0;
+
+	/*  Disable all the peripheral intrs  - page 4-29 HW Ref manual */
+#ifdef SIC_IMASK0
+	bfin_write_SIC_IMASK0(SIC_UNMASK_ALL);
+	bfin_write_SIC_IMASK1(SIC_UNMASK_ALL);
+# ifdef SIC_IMASK2
+	bfin_write_SIC_IMASK2(SIC_UNMASK_ALL);
+# endif
+# if defined(CONFIG_SMP) || defined(CONFIG_ICC)
+	bfin_write_SICB_IMASK0(SIC_UNMASK_ALL);
+	bfin_write_SICB_IMASK1(SIC_UNMASK_ALL);
+# endif
+#else
+	bfin_write_SIC_IMASK(SIC_UNMASK_ALL);
+#endif
+
+	local_irq_disable();
+
+	for (irq = 0; irq <= SYS_IRQS; irq++) {
+		if (irq <= IRQ_CORETMR)
+			irq_set_chip(irq, &bfin_core_irqchip);
+		else
+			irq_set_chip(irq, &bfin_internal_irqchip);
+
+		switch (irq) {
+#if !BFIN_GPIO_PINT
+#if defined(BF537_FAMILY)
+		case IRQ_PH_INTA_MAC_RX:
+		case IRQ_PF_INTA_PG_INTA:
+#elif defined(BF533_FAMILY)
+		case IRQ_PROG_INTA:
+#elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
+		case IRQ_PORTF_INTA:
+		case IRQ_PORTG_INTA:
+		case IRQ_PORTH_INTA:
+#elif defined(CONFIG_BF561)
+		case IRQ_PROG0_INTA:
+		case IRQ_PROG1_INTA:
+		case IRQ_PROG2_INTA:
+#elif defined(BF538_FAMILY)
+		case IRQ_PORTF_INTA:
+#endif
+			irq_set_chained_handler(irq, bfin_demux_gpio_irq);
+			break;
+#endif
+#if defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE)
+		case IRQ_MAC_ERROR:
+			irq_set_chained_handler(irq,
+						bfin_demux_mac_status_irq);
+			break;
+#endif
+#if defined(CONFIG_SMP) || defined(CONFIG_ICC)
+		case IRQ_SUPPLE_0:
+		case IRQ_SUPPLE_1:
+			irq_set_handler(irq, handle_percpu_irq);
+			break;
+#endif
+
+#ifdef CONFIG_TICKSOURCE_CORETMR
+		case IRQ_CORETMR:
+# ifdef CONFIG_SMP
+			irq_set_handler(irq, handle_percpu_irq);
+# else
+			irq_set_handler(irq, handle_simple_irq);
+# endif
+			break;
+#endif
+
+#ifdef CONFIG_TICKSOURCE_GPTMR0
+		case IRQ_TIMER0:
+			irq_set_handler(irq, handle_simple_irq);
+			break;
+#endif
+
+		default:
+#ifdef CONFIG_IPIPE
+			irq_set_handler(irq, handle_level_irq);
+#else
+			irq_set_handler(irq, handle_simple_irq);
+#endif
+			break;
+		}
+	}
+
+	init_mach_irq();
+
+#if (defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE))
+	for (irq = IRQ_MAC_PHYINT; irq <= IRQ_MAC_STMDONE; irq++)
+		irq_set_chip_and_handler(irq, &bfin_mac_status_irqchip,
+					 handle_level_irq);
+#endif
+	/* if configured as edge, then will be changed to do_edge_IRQ */
+#ifdef CONFIG_GPIO_ADI
+	for (irq = GPIO_IRQ_BASE;
+		irq < (GPIO_IRQ_BASE + MAX_BLACKFIN_GPIOS); irq++)
+		irq_set_chip_and_handler(irq, &bfin_gpio_irqchip,
+					 handle_level_irq);
+#endif
+	bfin_write_IMASK(0);
+	CSYNC();
+	ilat = bfin_read_ILAT();
+	CSYNC();
+	bfin_write_ILAT(ilat);
+	CSYNC();
+
+	printk(KERN_INFO "Configuring Blackfin Priority Driven Interrupts\n");
+	/* IMASK=xxx is equivalent to STI xx or bfin_irq_flags=xx,
+	 * local_irq_enable()
+	 */
+	program_IAR();
+	/* Therefore it's better to setup IARs before interrupts enabled */
+	search_IAR();
+
+	/* Enable interrupts IVG7-15 */
+	bfin_irq_flags |= IMASK_IVG15 |
+		IMASK_IVG14 | IMASK_IVG13 | IMASK_IVG12 | IMASK_IVG11 |
+		IMASK_IVG10 | IMASK_IVG9 | IMASK_IVG8 | IMASK_IVG7 | IMASK_IVGHW;
+
+
+	/* This implicitly covers ANOMALY_05000171
+	 * Boot-ROM code modifies SICA_IWRx wakeup registers
+	 */
+#ifdef SIC_IWR0
+	bfin_write_SIC_IWR0(IWR_DISABLE_ALL);
+# ifdef SIC_IWR1
+	/* BF52x/BF51x system reset does not properly reset SIC_IWR1 which
+	 * will screw up the bootrom as it relies on MDMA0/1 waking it
+	 * up from IDLE instructions.  See this report for more info:
+	 * http://blackfin.uclinux.org/gf/tracker/4323
+	 */
+	if (ANOMALY_05000435)
+		bfin_write_SIC_IWR1(IWR_ENABLE(10) | IWR_ENABLE(11));
+	else
+		bfin_write_SIC_IWR1(IWR_DISABLE_ALL);
+# endif
+# ifdef SIC_IWR2
+	bfin_write_SIC_IWR2(IWR_DISABLE_ALL);
+# endif
+#else
+	bfin_write_SIC_IWR(IWR_DISABLE_ALL);
+#endif
+	return 0;
+}
+
+#ifdef CONFIG_DO_IRQ_L1
+__attribute__((l1_text))
+#endif
+static int vec_to_irq(int vec)
+{
+	struct ivgx *ivg = ivg7_13[vec - IVG7].ifirst;
+	struct ivgx *ivg_stop = ivg7_13[vec - IVG7].istop;
+	unsigned long sic_status[3];
+	if (likely(vec == EVT_IVTMR_P))
+		return IRQ_CORETMR;
+#ifdef SIC_ISR
+	sic_status[0] = bfin_read_SIC_IMASK() & bfin_read_SIC_ISR();
+#else
+	if (smp_processor_id()) {
+# ifdef SICB_ISR0
+		/* This will be optimized out in UP mode. */
+		sic_status[0] = bfin_read_SICB_ISR0() & bfin_read_SICB_IMASK0();
+		sic_status[1] = bfin_read_SICB_ISR1() & bfin_read_SICB_IMASK1();
+# endif
+	} else {
+		sic_status[0] = bfin_read_SIC_ISR0() & bfin_read_SIC_IMASK0();
+		sic_status[1] = bfin_read_SIC_ISR1() & bfin_read_SIC_IMASK1();
+	}
+#endif
+#ifdef SIC_ISR2
+	sic_status[2] = bfin_read_SIC_ISR2() & bfin_read_SIC_IMASK2();
+#endif
+
+	for (;; ivg++) {
+		if (ivg >= ivg_stop)
+			return -1;
+#ifdef SIC_ISR
+		if (sic_status[0] & ivg->isrflag)
+#else
+		if (sic_status[(ivg->irqno - IVG7) / 32] & ivg->isrflag)
+#endif
+			return ivg->irqno;
+	}
+}
+
+#else /* SEC_GCTL */
+
+/*
+ * This function should be called during kernel startup to initialize
+ * the BFin IRQ handling routines.
+ */
+
+int __init init_arch_irq(void)
+{
+	int irq;
+	unsigned long ilat = 0;
+
+	bfin_write_SEC_GCTL(SEC_GCTL_RESET);
+
+	local_irq_disable();
+
+	for (irq = 0; irq <= SYS_IRQS; irq++) {
+		if (irq <= IRQ_CORETMR) {
+			irq_set_chip_and_handler(irq, &bfin_core_irqchip,
+				handle_simple_irq);
+#if defined(CONFIG_TICKSOURCE_CORETMR) && defined(CONFIG_SMP)
+			if (irq == IRQ_CORETMR)
+				irq_set_handler(irq, handle_percpu_irq);
+#endif
+		} else if (irq >= BFIN_IRQ(34) && irq <= BFIN_IRQ(37)) {
+			irq_set_chip_and_handler(irq, &bfin_sec_irqchip,
+				handle_percpu_irq);
+		} else {
+			irq_set_chip(irq, &bfin_sec_irqchip);
+			irq_set_handler(irq, handle_fasteoi_irq);
+			__irq_set_preflow_handler(irq, bfin_sec_preflow_handler);
+		}
+	}
+
+	bfin_write_IMASK(0);
+	CSYNC();
+	ilat = bfin_read_ILAT();
+	CSYNC();
+	bfin_write_ILAT(ilat);
+	CSYNC();
+
+	printk(KERN_INFO "Configuring Blackfin Priority Driven Interrupts\n");
+
+	bfin_sec_set_priority(CONFIG_SEC_IRQ_PRIORITY_LEVELS, sec_int_priority);
+
+	/* Enable interrupts IVG7-15 */
+	bfin_irq_flags |= IMASK_IVG15 |
+	    IMASK_IVG14 | IMASK_IVG13 | IMASK_IVG12 | IMASK_IVG11 |
+	    IMASK_IVG10 | IMASK_IVG9 | IMASK_IVG8 | IMASK_IVG7 | IMASK_IVGHW;
+
+
+	bfin_write_SEC_FCTL(SEC_FCTL_EN | SEC_FCTL_SYSRST_EN | SEC_FCTL_FLTIN_EN);
+	bfin_sec_enable_sci(BFIN_SYSIRQ(IRQ_WATCH0));
+	bfin_sec_enable_ssi(BFIN_SYSIRQ(IRQ_WATCH0));
+	bfin_write_SEC_SCI(0, SEC_CCTL, SEC_CCTL_RESET);
+	udelay(100);
+	bfin_write_SEC_GCTL(SEC_GCTL_EN);
+	bfin_write_SEC_SCI(0, SEC_CCTL, SEC_CCTL_EN | SEC_CCTL_NMI_EN);
+	bfin_write_SEC_SCI(1, SEC_CCTL, SEC_CCTL_EN | SEC_CCTL_NMI_EN);
+
+	init_software_driven_irq();
+
+#ifdef CONFIG_PM
+	register_syscore_ops(&sec_pm_syscore_ops);
+#endif
+
+	bfin_fault_irq.handler = bfin_fault_routine;
+#ifdef CONFIG_L1_PARITY_CHECK
+	setup_irq(IRQ_C0_NMI_L1_PARITY_ERR, &bfin_fault_irq);
+#endif
+	setup_irq(IRQ_C0_DBL_FAULT, &bfin_fault_irq);
+	setup_irq(IRQ_SEC_ERR, &bfin_fault_irq);
+
+	return 0;
+}
+
+#ifdef CONFIG_DO_IRQ_L1
+__attribute__((l1_text))
+#endif
+static int vec_to_irq(int vec)
+{
+	if (likely(vec == EVT_IVTMR_P))
+		return IRQ_CORETMR;
+
+	return BFIN_IRQ(bfin_read_SEC_SCI(0, SEC_CSID));
+}
+#endif  /* SEC_GCTL */
+
+#ifdef CONFIG_DO_IRQ_L1
+__attribute__((l1_text))
+#endif
+void do_irq(int vec, struct pt_regs *fp)
+{
+	int irq = vec_to_irq(vec);
+	if (irq == -1)
+		return;
+	asm_do_IRQ(irq, fp);
+}
+
+#ifdef CONFIG_IPIPE
+
+int __ipipe_get_irq_priority(unsigned irq)
+{
+	int ient, prio;
+
+	if (irq <= IRQ_CORETMR)
+		return irq;
+
+#ifdef SEC_GCTL
+	if (irq >= BFIN_IRQ(0))
+		return IVG11;
+#else
+	for (ient = 0; ient < NR_PERI_INTS; ient++) {
+		struct ivgx *ivg = ivg_table + ient;
+		if (ivg->irqno == irq) {
+			for (prio = 0; prio <= IVG13-IVG7; prio++) {
+				if (ivg7_13[prio].ifirst <= ivg &&
+				    ivg7_13[prio].istop > ivg)
+					return IVG7 + prio;
+			}
+		}
+	}
+#endif
+
+	return IVG15;
+}
+
+/* Hw interrupts are disabled on entry (check SAVE_CONTEXT). */
+#ifdef CONFIG_DO_IRQ_L1
+__attribute__((l1_text))
+#endif
+asmlinkage int __ipipe_grab_irq(int vec, struct pt_regs *regs)
+{
+	struct ipipe_percpu_domain_data *p = ipipe_root_cpudom_ptr();
+	struct ipipe_domain *this_domain = __ipipe_current_domain;
+	int irq, s = 0;
+
+	irq = vec_to_irq(vec);
+	if (irq == -1)
+		return 0;
+
+	if (irq == IRQ_SYSTMR) {
+#if !defined(CONFIG_GENERIC_CLOCKEVENTS) || defined(CONFIG_TICKSOURCE_GPTMR0)
+		bfin_write_TIMER_STATUS(1); /* Latch TIMIL0 */
+#endif
+		/* This is basically what we need from the register frame. */
+		__this_cpu_write(__ipipe_tick_regs.ipend, regs->ipend);
+		__this_cpu_write(__ipipe_tick_regs.pc, regs->pc);
+		if (this_domain != ipipe_root_domain)
+			__this_cpu_and(__ipipe_tick_regs.ipend, ~0x10);
+		else
+			__this_cpu_or(__ipipe_tick_regs.ipend, 0x10);
+	}
+
+	/*
+	 * We don't want Linux interrupt handlers to run at the
+	 * current core priority level (i.e. < EVT15), since this
+	 * might delay other interrupts handled by a high priority
+	 * domain. Here is what we do instead:
+	 *
+	 * - we raise the SYNCDEFER bit to prevent
+	 * __ipipe_handle_irq() to sync the pipeline for the root
+	 * stage for the incoming interrupt. Upon return, that IRQ is
+	 * pending in the interrupt log.
+	 *
+	 * - we raise the TIF_IRQ_SYNC bit for the current thread, so
+	 * that _schedule_and_signal_from_int will eventually sync the
+	 * pipeline from EVT15.
+	 */
+	if (this_domain == ipipe_root_domain) {
+		s = __test_and_set_bit(IPIPE_SYNCDEFER_FLAG, &p->status);
+		barrier();
+	}
+
+	ipipe_trace_irq_entry(irq);
+	__ipipe_handle_irq(irq, regs);
+	ipipe_trace_irq_exit(irq);
+
+	if (user_mode(regs) &&
+	    !ipipe_test_foreign_stack() &&
+	    (current->ipipe_flags & PF_EVTRET) != 0) {
+		/*
+		 * Testing for user_regs() does NOT fully eliminate
+		 * foreign stack contexts, because of the forged
+		 * interrupt returns we do through
+		 * __ipipe_call_irqtail. In that case, we might have
+		 * preempted a foreign stack context in a high
+		 * priority domain, with a single interrupt level now
+		 * pending after the irqtail unwinding is done. In
+		 * which case user_mode() is now true, and the event
+		 * gets dispatched spuriously.
+		 */
+		current->ipipe_flags &= ~PF_EVTRET;
+		__ipipe_dispatch_event(IPIPE_EVENT_RETURN, regs);
+	}
+
+	if (this_domain == ipipe_root_domain) {
+		set_thread_flag(TIF_IRQ_SYNC);
+		if (!s) {
+			__clear_bit(IPIPE_SYNCDEFER_FLAG, &p->status);
+			return !test_bit(IPIPE_STALL_FLAG, &p->status);
+		}
+	}
+
+	return 0;
+}
+
+#endif /* CONFIG_IPIPE */