[MIPS] Malta: Cleanup organization of code into directories.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 712 insertions, 0 deletions

diff --git a/arch/mips/mti-malta/malta-int.c b/arch/mips/mti-malta/malta-int.c
new file mode 100644
index 000000000000..ea176113fea9
--- /dev/null
+++ b/arch/mips/mti-malta/malta-int.c
@@ -0,0 +1,712 @@
+/*
+ * Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 2000, 2001, 2004 MIPS Technologies, Inc.
+ * Copyright (C) 2001 Ralf Baechle
+ *
+ *  This program is free software; you can distribute it and/or modify it
+ *  under the terms of the GNU General Public License (Version 2) as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope 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 this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Routines for generic manipulation of the interrupts found on the MIPS
+ * Malta board.
+ * The interrupt controller is located in the South Bridge a PIIX4 device
+ * with two internal 82C95 interrupt controllers.
+ */
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel_stat.h>
+#include <linux/kernel.h>
+#include <linux/random.h>
+
+#include <asm/traps.h>
+#include <asm/i8259.h>
+#include <asm/irq_cpu.h>
+#include <asm/irq_regs.h>
+#include <asm/mips-boards/malta.h>
+#include <asm/mips-boards/maltaint.h>
+#include <asm/mips-boards/piix4.h>
+#include <asm/gt64120.h>
+#include <asm/mips-boards/generic.h>
+#include <asm/mips-boards/msc01_pci.h>
+#include <asm/msc01_ic.h>
+#include <asm/gic.h>
+#include <asm/gcmpregs.h>
+
+int gcmp_present = -1;
+int gic_present;
+static unsigned long _msc01_biu_base;
+static unsigned long _gcmp_base;
+static unsigned int ipi_map[NR_CPUS];
+
+static DEFINE_SPINLOCK(mips_irq_lock);
+
+static inline int mips_pcibios_iack(void)
+{
+	int irq;
+	u32 dummy;
+
+	/*
+	 * Determine highest priority pending interrupt by performing
+	 * a PCI Interrupt Acknowledge cycle.
+	 */
+	switch (mips_revision_sconid) {
+	case MIPS_REVISION_SCON_SOCIT:
+	case MIPS_REVISION_SCON_ROCIT:
+	case MIPS_REVISION_SCON_SOCITSC:
+	case MIPS_REVISION_SCON_SOCITSCP:
+		MSC_READ(MSC01_PCI_IACK, irq);
+		irq &= 0xff;
+		break;
+	case MIPS_REVISION_SCON_GT64120:
+		irq = GT_READ(GT_PCI0_IACK_OFS);
+		irq &= 0xff;
+		break;
+	case MIPS_REVISION_SCON_BONITO:
+		/* The following will generate a PCI IACK cycle on the
+		 * Bonito controller. It's a little bit kludgy, but it
+		 * was the easiest way to implement it in hardware at
+		 * the given time.
+		 */
+		BONITO_PCIMAP_CFG = 0x20000;
+
+		/* Flush Bonito register block */
+		dummy = BONITO_PCIMAP_CFG;
+		iob();    /* sync */
+
+		irq = readl((u32 *)_pcictrl_bonito_pcicfg);
+		iob();    /* sync */
+		irq &= 0xff;
+		BONITO_PCIMAP_CFG = 0;
+		break;
+	default:
+		printk(KERN_WARNING "Unknown system controller.\n");
+		return -1;
+	}
+	return irq;
+}
+
+static inline int get_int(void)
+{
+	unsigned long flags;
+	int irq;
+	spin_lock_irqsave(&mips_irq_lock, flags);
+
+	irq = mips_pcibios_iack();
+
+	/*
+	 * The only way we can decide if an interrupt is spurious
+	 * is by checking the 8259 registers.  This needs a spinlock
+	 * on an SMP system,  so leave it up to the generic code...
+	 */
+
+	spin_unlock_irqrestore(&mips_irq_lock, flags);
+
+	return irq;
+}
+
+static void malta_hw0_irqdispatch(void)
+{
+	int irq;
+
+	irq = get_int();
+	if (irq < 0) {
+		/* interrupt has already been cleared */
+		return;
+	}
+
+	do_IRQ(MALTA_INT_BASE + irq);
+}
+
+static void malta_ipi_irqdispatch(void)
+{
+	int irq;
+
+	irq = gic_get_int();
+	if (irq < 0)
+		return;  /* interrupt has already been cleared */
+
+	do_IRQ(MIPS_GIC_IRQ_BASE + irq);
+}
+
+static void corehi_irqdispatch(void)
+{
+	unsigned int intedge, intsteer, pcicmd, pcibadaddr;
+	unsigned int pcimstat, intisr, inten, intpol;
+	unsigned int intrcause, datalo, datahi;
+	struct pt_regs *regs = get_irq_regs();
+
+	printk(KERN_EMERG "CoreHI interrupt, shouldn't happen, we die here!\n");
+	printk(KERN_EMERG "epc   : %08lx\nStatus: %08lx\n"
+			"Cause : %08lx\nbadVaddr : %08lx\n",
+			regs->cp0_epc, regs->cp0_status,
+			regs->cp0_cause, regs->cp0_badvaddr);
+
+	/* Read all the registers and then print them as there is a
+	   problem with interspersed printk's upsetting the Bonito controller.
+	   Do it for the others too.
+	*/
+
+	switch (mips_revision_sconid) {
+	case MIPS_REVISION_SCON_SOCIT:
+	case MIPS_REVISION_SCON_ROCIT:
+	case MIPS_REVISION_SCON_SOCITSC:
+	case MIPS_REVISION_SCON_SOCITSCP:
+		ll_msc_irq();
+		break;
+	case MIPS_REVISION_SCON_GT64120:
+		intrcause = GT_READ(GT_INTRCAUSE_OFS);
+		datalo = GT_READ(GT_CPUERR_ADDRLO_OFS);
+		datahi = GT_READ(GT_CPUERR_ADDRHI_OFS);
+		printk(KERN_EMERG "GT_INTRCAUSE = %08x\n", intrcause);
+		printk(KERN_EMERG "GT_CPUERR_ADDR = %02x%08x\n",
+				datahi, datalo);
+		break;
+	case MIPS_REVISION_SCON_BONITO:
+		pcibadaddr = BONITO_PCIBADADDR;
+		pcimstat = BONITO_PCIMSTAT;
+		intisr = BONITO_INTISR;
+		inten = BONITO_INTEN;
+		intpol = BONITO_INTPOL;
+		intedge = BONITO_INTEDGE;
+		intsteer = BONITO_INTSTEER;
+		pcicmd = BONITO_PCICMD;
+		printk(KERN_EMERG "BONITO_INTISR = %08x\n", intisr);
+		printk(KERN_EMERG "BONITO_INTEN = %08x\n", inten);
+		printk(KERN_EMERG "BONITO_INTPOL = %08x\n", intpol);
+		printk(KERN_EMERG "BONITO_INTEDGE = %08x\n", intedge);
+		printk(KERN_EMERG "BONITO_INTSTEER = %08x\n", intsteer);
+		printk(KERN_EMERG "BONITO_PCICMD = %08x\n", pcicmd);
+		printk(KERN_EMERG "BONITO_PCIBADADDR = %08x\n", pcibadaddr);
+		printk(KERN_EMERG "BONITO_PCIMSTAT = %08x\n", pcimstat);
+		break;
+	}
+
+	die("CoreHi interrupt", regs);
+}
+
+static inline int clz(unsigned long x)
+{
+	__asm__(
+	"	.set	push					\n"
+	"	.set	mips32					\n"
+	"	clz	%0, %1					\n"
+	"	.set	pop					\n"
+	: "=r" (x)
+	: "r" (x));
+
+	return x;
+}
+
+/*
+ * Version of ffs that only looks at bits 12..15.
+ */
+static inline unsigned int irq_ffs(unsigned int pending)
+{
+#if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
+	return -clz(pending) + 31 - CAUSEB_IP;
+#else
+	unsigned int a0 = 7;
+	unsigned int t0;
+
+	t0 = pending & 0xf000;
+	t0 = t0 < 1;
+	t0 = t0 << 2;
+	a0 = a0 - t0;
+	pending = pending << t0;
+
+	t0 = pending & 0xc000;
+	t0 = t0 < 1;
+	t0 = t0 << 1;
+	a0 = a0 - t0;
+	pending = pending << t0;
+
+	t0 = pending & 0x8000;
+	t0 = t0 < 1;
+	/* t0 = t0 << 2; */
+	a0 = a0 - t0;
+	/* pending = pending << t0; */
+
+	return a0;
+#endif
+}
+
+/*
+ * IRQs on the Malta board look basically (barring software IRQs which we
+ * don't use at all and all external interrupt sources are combined together
+ * on hardware interrupt 0 (MIPS IRQ 2)) like:
+ *
+ *	MIPS IRQ	Source
+ *      --------        ------
+ *             0	Software (ignored)
+ *             1        Software (ignored)
+ *             2        Combined hardware interrupt (hw0)
+ *             3        Hardware (ignored)
+ *             4        Hardware (ignored)
+ *             5        Hardware (ignored)
+ *             6        Hardware (ignored)
+ *             7        R4k timer (what we use)
+ *
+ * We handle the IRQ according to _our_ priority which is:
+ *
+ * Highest ----     R4k Timer
+ * Lowest  ----     Combined hardware interrupt
+ *
+ * then we just return, if multiple IRQs are pending then we will just take
+ * another exception, big deal.
+ */
+
+asmlinkage void plat_irq_dispatch(void)
+{
+	unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
+	int irq;
+
+	irq = irq_ffs(pending);
+
+	if (irq == MIPSCPU_INT_I8259A)
+		malta_hw0_irqdispatch();
+	else if (gic_present && ((1 << irq) & ipi_map[smp_processor_id()]))
+		malta_ipi_irqdispatch();
+	else if (irq >= 0)
+		do_IRQ(MIPS_CPU_IRQ_BASE + irq);
+	else
+		spurious_interrupt();
+}
+
+#ifdef CONFIG_MIPS_MT_SMP
+
+
+#define GIC_MIPS_CPU_IPI_RESCHED_IRQ	3
+#define GIC_MIPS_CPU_IPI_CALL_IRQ	4
+
+#define MIPS_CPU_IPI_RESCHED_IRQ 0	/* SW int 0 for resched */
+#define C_RESCHED C_SW0
+#define MIPS_CPU_IPI_CALL_IRQ 1		/* SW int 1 for resched */
+#define C_CALL C_SW1
+static int cpu_ipi_resched_irq, cpu_ipi_call_irq;
+
+static void ipi_resched_dispatch(void)
+{
+	do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ);
+}
+
+static void ipi_call_dispatch(void)
+{
+	do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ);
+}
+
+static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
+{
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
+{
+	smp_call_function_interrupt();
+
+	return IRQ_HANDLED;
+}
+
+static struct irqaction irq_resched = {
+	.handler	= ipi_resched_interrupt,
+	.flags		= IRQF_DISABLED|IRQF_PERCPU,
+	.name		= "IPI_resched"
+};
+
+static struct irqaction irq_call = {
+	.handler	= ipi_call_interrupt,
+	.flags		= IRQF_DISABLED|IRQF_PERCPU,
+	.name		= "IPI_call"
+};
+#endif /* CONFIG_MIPS_MT_SMP */
+
+static struct irqaction i8259irq = {
+	.handler = no_action,
+	.name = "XT-PIC cascade"
+};
+
+static struct irqaction corehi_irqaction = {
+	.handler = no_action,
+	.name = "CoreHi"
+};
+
+static msc_irqmap_t __initdata msc_irqmap[] = {
+	{MSC01C_INT_TMR,		MSC01_IRQ_EDGE, 0},
+	{MSC01C_INT_PCI,		MSC01_IRQ_LEVEL, 0},
+};
+static int __initdata msc_nr_irqs = ARRAY_SIZE(msc_irqmap);
+
+static msc_irqmap_t __initdata msc_eicirqmap[] = {
+	{MSC01E_INT_SW0,		MSC01_IRQ_LEVEL, 0},
+	{MSC01E_INT_SW1,		MSC01_IRQ_LEVEL, 0},
+	{MSC01E_INT_I8259A,		MSC01_IRQ_LEVEL, 0},
+	{MSC01E_INT_SMI,		MSC01_IRQ_LEVEL, 0},
+	{MSC01E_INT_COREHI,		MSC01_IRQ_LEVEL, 0},
+	{MSC01E_INT_CORELO,		MSC01_IRQ_LEVEL, 0},
+	{MSC01E_INT_TMR,		MSC01_IRQ_EDGE, 0},
+	{MSC01E_INT_PCI,		MSC01_IRQ_LEVEL, 0},
+	{MSC01E_INT_PERFCTR,		MSC01_IRQ_LEVEL, 0},
+	{MSC01E_INT_CPUCTR,		MSC01_IRQ_LEVEL, 0}
+};
+
+static int __initdata msc_nr_eicirqs = ARRAY_SIZE(msc_eicirqmap);
+
+#if defined(CONFIG_MIPS_MT_SMP)
+/*
+ * This GIC specific tabular array defines the association between External
+ * Interrupts and CPUs/Core Interrupts. The nature of the External
+ * Interrupts is also defined here - polarity/trigger.
+ */
+static struct gic_intr_map gic_intr_map[] = {
+	{ GIC_EXT_INTR(0), 	X,	X,		X, 		X,		0 },
+	{ GIC_EXT_INTR(1), 	X,	X,		X, 		X,		0 },
+	{ GIC_EXT_INTR(2), 	X,	X,		X, 		X,		0 },
+	{ GIC_EXT_INTR(3), 	0,	GIC_CPU_INT0,	GIC_POL_POS, 	GIC_TRIG_LEVEL,	0 },
+	{ GIC_EXT_INTR(4), 	0,	GIC_CPU_INT1,	GIC_POL_POS, 	GIC_TRIG_LEVEL,	0 },
+	{ GIC_EXT_INTR(5), 	0,	GIC_CPU_INT2,	GIC_POL_POS, 	GIC_TRIG_LEVEL,	0 },
+	{ GIC_EXT_INTR(6), 	0,	GIC_CPU_INT3,	GIC_POL_POS, 	GIC_TRIG_LEVEL,	0 },
+	{ GIC_EXT_INTR(7), 	0,	GIC_CPU_INT4,	GIC_POL_POS, 	GIC_TRIG_LEVEL,	0 },
+	{ GIC_EXT_INTR(8), 	0,	GIC_CPU_INT3,	GIC_POL_POS, 	GIC_TRIG_LEVEL,	0 },
+	{ GIC_EXT_INTR(9), 	0,	GIC_CPU_INT3,	GIC_POL_POS, 	GIC_TRIG_LEVEL,	0 },
+	{ GIC_EXT_INTR(10), 	X,	X,		X, 		X,		0 },
+	{ GIC_EXT_INTR(11), 	X,	X,		X, 		X,		0 },
+	{ GIC_EXT_INTR(12), 	0,	GIC_CPU_INT3,	GIC_POL_POS, 	GIC_TRIG_LEVEL,	0 },
+	{ GIC_EXT_INTR(13), 	0,	GIC_MAP_TO_NMI_MSK,	GIC_POL_POS, GIC_TRIG_LEVEL,	0 },
+	{ GIC_EXT_INTR(14), 	0,	GIC_MAP_TO_NMI_MSK,	GIC_POL_POS, GIC_TRIG_LEVEL,	0 },
+	{ GIC_EXT_INTR(15), 	X,	X,		X, 		X,		0 },
+	{ GIC_EXT_INTR(16), 	0,	GIC_CPU_INT1,	GIC_POL_POS, GIC_TRIG_EDGE,	1 },
+	{ GIC_EXT_INTR(17), 	0,	GIC_CPU_INT2,	GIC_POL_POS, GIC_TRIG_EDGE,	1 },
+	{ GIC_EXT_INTR(18), 	1,	GIC_CPU_INT1,	GIC_POL_POS, GIC_TRIG_EDGE,	1 },
+	{ GIC_EXT_INTR(19), 	1,	GIC_CPU_INT2,	GIC_POL_POS, GIC_TRIG_EDGE,	1 },
+	{ GIC_EXT_INTR(20), 	2,	GIC_CPU_INT1,	GIC_POL_POS, GIC_TRIG_EDGE,	1 },
+	{ GIC_EXT_INTR(21), 	2,	GIC_CPU_INT2,	GIC_POL_POS, GIC_TRIG_EDGE,	1 },
+	{ GIC_EXT_INTR(22), 	3,	GIC_CPU_INT1,	GIC_POL_POS, GIC_TRIG_EDGE,	1 },
+	{ GIC_EXT_INTR(23), 	3,	GIC_CPU_INT2,	GIC_POL_POS, GIC_TRIG_EDGE,	1 },
+};
+#endif
+
+/*
+ * GCMP needs to be detected before any SMP initialisation
+ */
+static int __init gcmp_probe(unsigned long addr, unsigned long size)
+{
+	if (gcmp_present >= 0)
+		return gcmp_present;
+
+	_gcmp_base = (unsigned long) ioremap_nocache(GCMP_BASE_ADDR, GCMP_ADDRSPACE_SZ);
+	_msc01_biu_base = (unsigned long) ioremap_nocache(MSC01_BIU_REG_BASE, MSC01_BIU_ADDRSPACE_SZ);
+	gcmp_present = (GCMPGCB(GCMPB) & GCMP_GCB_GCMPB_GCMPBASE_MSK) == GCMP_BASE_ADDR;
+
+	if (gcmp_present)
+		printk(KERN_DEBUG "GCMP present\n");
+	return gcmp_present;
+}
+
+#if defined(CONFIG_MIPS_MT_SMP)
+static void __init fill_ipi_map(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(gic_intr_map); i++) {
+		if (gic_intr_map[i].ipiflag && (gic_intr_map[i].cpunum != X))
+			ipi_map[gic_intr_map[i].cpunum] |=
+				(1 << (gic_intr_map[i].pin + 2));
+	}
+}
+#endif
+
+void __init arch_init_irq(void)
+{
+	int gic_present, gcmp_present;
+
+	init_i8259_irqs();
+
+	if (!cpu_has_veic)
+		mips_cpu_irq_init();
+
+	gcmp_present = gcmp_probe(GCMP_BASE_ADDR, GCMP_ADDRSPACE_SZ);
+	if (gcmp_present)  {
+		GCMPGCB(GICBA) = GIC_BASE_ADDR | GCMP_GCB_GICBA_EN_MSK;
+		gic_present = 1;
+	} else {
+		_msc01_biu_base = (unsigned long) ioremap_nocache(MSC01_BIU_REG_BASE, MSC01_BIU_ADDRSPACE_SZ);
+		gic_present = (REG(_msc01_biu_base, MSC01_SC_CFG) &
+		MSC01_SC_CFG_GICPRES_MSK) >> MSC01_SC_CFG_GICPRES_SHF;
+	}
+	if (gic_present)
+		printk(KERN_DEBUG "GIC present\n");
+
+	switch (mips_revision_sconid) {
+	case MIPS_REVISION_SCON_SOCIT:
+	case MIPS_REVISION_SCON_ROCIT:
+		if (cpu_has_veic)
+			init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
+					MSC01E_INT_BASE, msc_eicirqmap,
+					msc_nr_eicirqs);
+		else
+			init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
+					MSC01C_INT_BASE, msc_irqmap,
+					msc_nr_irqs);
+		break;
+
+	case MIPS_REVISION_SCON_SOCITSC:
+	case MIPS_REVISION_SCON_SOCITSCP:
+		if (cpu_has_veic)
+			init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
+					MSC01E_INT_BASE, msc_eicirqmap,
+					msc_nr_eicirqs);
+		else
+			init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
+					MSC01C_INT_BASE, msc_irqmap,
+					msc_nr_irqs);
+	}
+
+	if (cpu_has_veic) {
+		set_vi_handler(MSC01E_INT_I8259A, malta_hw0_irqdispatch);
+		set_vi_handler(MSC01E_INT_COREHI, corehi_irqdispatch);
+		setup_irq(MSC01E_INT_BASE+MSC01E_INT_I8259A, &i8259irq);
+		setup_irq(MSC01E_INT_BASE+MSC01E_INT_COREHI, &corehi_irqaction);
+	} else if (cpu_has_vint) {
+		set_vi_handler(MIPSCPU_INT_I8259A, malta_hw0_irqdispatch);
+		set_vi_handler(MIPSCPU_INT_COREHI, corehi_irqdispatch);
+#ifdef CONFIG_MIPS_MT_SMTC
+		setup_irq_smtc(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq,
+			(0x100 << MIPSCPU_INT_I8259A));
+		setup_irq_smtc(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
+			&corehi_irqaction, (0x100 << MIPSCPU_INT_COREHI));
+		/*
+		 * Temporary hack to ensure that the subsidiary device
+		 * interrupts coing in via the i8259A, but associated
+		 * with low IRQ numbers, will restore the Status.IM
+		 * value associated with the i8259A.
+		 */
+		{
+			int i;
+
+			for (i = 0; i < 16; i++)
+				irq_hwmask[i] = (0x100 << MIPSCPU_INT_I8259A);
+		}
+#else /* Not SMTC */
+		setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);
+		setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
+						&corehi_irqaction);
+#endif /* CONFIG_MIPS_MT_SMTC */
+	} else {
+		setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);
+		setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
+						&corehi_irqaction);
+	}
+
+#if defined(CONFIG_MIPS_MT_SMP)
+	if (gic_present) {
+		/* FIXME */
+		int i;
+		struct {
+			unsigned int resched;
+			unsigned int call;
+		} ipiirq[] = {
+			{
+				.resched = GIC_IPI_EXT_INTR_RESCHED_VPE0,
+				.call =  GIC_IPI_EXT_INTR_CALLFNC_VPE0},
+			{
+				.resched = GIC_IPI_EXT_INTR_RESCHED_VPE1,
+				.call =  GIC_IPI_EXT_INTR_CALLFNC_VPE1
+			}, {
+				.resched = GIC_IPI_EXT_INTR_RESCHED_VPE2,
+				.call =  GIC_IPI_EXT_INTR_CALLFNC_VPE2
+			}, {
+				.resched = GIC_IPI_EXT_INTR_RESCHED_VPE3,
+				.call =  GIC_IPI_EXT_INTR_CALLFNC_VPE3
+			}
+		};
+		fill_ipi_map();
+		gic_init(GIC_BASE_ADDR, GIC_ADDRSPACE_SZ, gic_intr_map, ARRAY_SIZE(gic_intr_map), MIPS_GIC_IRQ_BASE);
+		if (!gcmp_present) {
+			/* Enable the GIC */
+			i = REG(_msc01_biu_base, MSC01_SC_CFG);
+			REG(_msc01_biu_base, MSC01_SC_CFG) =
+				(i | (0x1 << MSC01_SC_CFG_GICENA_SHF));
+			pr_debug("GIC Enabled\n");
+		}
+
+		/* set up ipi interrupts */
+		if (cpu_has_vint) {
+			set_vi_handler(MIPSCPU_INT_IPI0, malta_ipi_irqdispatch);
+			set_vi_handler(MIPSCPU_INT_IPI1, malta_ipi_irqdispatch);
+		}
+		/* Argh.. this really needs sorting out.. */
+		printk("CPU%d: status register was %08x\n", smp_processor_id(), read_c0_status());
+		write_c0_status(read_c0_status() | STATUSF_IP3 | STATUSF_IP4);
+		printk("CPU%d: status register now %08x\n", smp_processor_id(), read_c0_status());
+		write_c0_status(0x1100dc00);
+		printk("CPU%d: status register frc %08x\n", smp_processor_id(), read_c0_status());
+		for (i = 0; i < ARRAY_SIZE(ipiirq); i++) {
+			setup_irq(MIPS_GIC_IRQ_BASE + ipiirq[i].resched, &irq_resched);
+			setup_irq(MIPS_GIC_IRQ_BASE + ipiirq[i].call, &irq_call);
+
+			set_irq_handler(MIPS_GIC_IRQ_BASE + ipiirq[i].resched, handle_percpu_irq);
+			set_irq_handler(MIPS_GIC_IRQ_BASE + ipiirq[i].call, handle_percpu_irq);
+		}
+	} else {
+		/* set up ipi interrupts */
+		if (cpu_has_veic) {
+			set_vi_handler (MSC01E_INT_SW0, ipi_resched_dispatch);
+			set_vi_handler (MSC01E_INT_SW1, ipi_call_dispatch);
+			cpu_ipi_resched_irq = MSC01E_INT_SW0;
+			cpu_ipi_call_irq = MSC01E_INT_SW1;
+		} else {
+			if (cpu_has_vint) {
+				set_vi_handler (MIPS_CPU_IPI_RESCHED_IRQ, ipi_resched_dispatch);
+				set_vi_handler (MIPS_CPU_IPI_CALL_IRQ, ipi_call_dispatch);
+			}
+			cpu_ipi_resched_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ;
+			cpu_ipi_call_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ;
+		}
+
+		setup_irq(cpu_ipi_resched_irq, &irq_resched);
+		setup_irq(cpu_ipi_call_irq, &irq_call);
+
+		set_irq_handler(cpu_ipi_resched_irq, handle_percpu_irq);
+		set_irq_handler(cpu_ipi_call_irq, handle_percpu_irq);
+	}
+#endif
+}
+
+void malta_be_init(void)
+{
+	if (gcmp_present) {
+		/* Could change CM error mask register */
+	}
+}
+
+
+static char *tr[8] = {
+	"mem",	"gcr",	"gic",	"mmio",
+	"0x04",	"0x05",	"0x06",	"0x07"
+};
+
+static char *mcmd[32] = {
+	[0x00] = "0x00",
+	[0x01] = "Legacy Write",
+	[0x02] = "Legacy Read",
+	[0x03] = "0x03",
+	[0x04] = "0x04",
+	[0x05] = "0x05",
+	[0x06] = "0x06",
+	[0x07] = "0x07",
+	[0x08] = "Coherent Read Own",
+	[0x09] = "Coherent Read Share",
+	[0x0a] = "Coherent Read Discard",
+	[0x0b] = "Coherent Ready Share Always",
+	[0x0c] = "Coherent Upgrade",
+	[0x0d] = "Coherent Writeback",
+	[0x0e] = "0x0e",
+	[0x0f] = "0x0f",
+	[0x10] = "Coherent Copyback",
+	[0x11] = "Coherent Copyback Invalidate",
+	[0x12] = "Coherent Invalidate",
+	[0x13] = "Coherent Write Invalidate",
+	[0x14] = "Coherent Completion Sync",
+	[0x15] = "0x15",
+	[0x16] = "0x16",
+	[0x17] = "0x17",
+	[0x18] = "0x18",
+	[0x19] = "0x19",
+	[0x1a] = "0x1a",
+	[0x1b] = "0x1b",
+	[0x1c] = "0x1c",
+	[0x1d] = "0x1d",
+	[0x1e] = "0x1e",
+	[0x1f] = "0x1f"
+};
+
+static char *core[8] = {
+	"Invalid/OK", 	"Invalid/Data",
+	"Shared/OK",	"Shared/Data",
+	"Modified/OK",	"Modified/Data",
+	"Exclusive/OK",	"Exclusive/Data"
+};
+
+static char *causes[32] = {
+	"None", "GC_WR_ERR", "GC_RD_ERR", "COH_WR_ERR",
+	"COH_RD_ERR", "MMIO_WR_ERR", "MMIO_RD_ERR", "0x07",
+	"0x08", "0x09", "0x0a", "0x0b",
+	"0x0c", "0x0d", "0x0e", "0x0f",
+	"0x10", "0x11", "0x12", "0x13",
+	"0x14", "0x15", "0x16", "INTVN_WR_ERR",
+	"INTVN_RD_ERR", "0x19", "0x1a", "0x1b",
+	"0x1c", "0x1d", "0x1e", "0x1f"
+};
+
+int malta_be_handler(struct pt_regs *regs, int is_fixup)
+{
+	/* This duplicates the handling in do_be which seems wrong */
+	int retval = is_fixup ? MIPS_BE_FIXUP : MIPS_BE_FATAL;
+
+	if (gcmp_present) {
+		unsigned long cm_error = GCMPGCB(GCMEC);
+		unsigned long cm_addr = GCMPGCB(GCMEA);
+		unsigned long cm_other = GCMPGCB(GCMEO);
+		unsigned long cause, ocause;
+		char buf[256];
+
+		cause = (cm_error & GCMP_GCB_GMEC_ERROR_TYPE_MSK);
+		if (cause != 0) {
+			cause >>= GCMP_GCB_GMEC_ERROR_TYPE_SHF;
+			if (cause < 16) {
+				unsigned long cca_bits = (cm_error >> 15) & 7;
+				unsigned long tr_bits = (cm_error >> 12) & 7;
+				unsigned long mcmd_bits = (cm_error >> 7) & 0x1f;
+				unsigned long stag_bits = (cm_error >> 3) & 15;
+				unsigned long sport_bits = (cm_error >> 0) & 7;
+
+				snprintf(buf, sizeof(buf),
+					 "CCA=%lu TR=%s MCmd=%s STag=%lu "
+					 "SPort=%lu\n",
+					 cca_bits, tr[tr_bits], mcmd[mcmd_bits],
+					 stag_bits, sport_bits);
+			} else {
+				/* glob state & sresp together */
+				unsigned long c3_bits = (cm_error >> 18) & 7;
+				unsigned long c2_bits = (cm_error >> 15) & 7;
+				unsigned long c1_bits = (cm_error >> 12) & 7;
+				unsigned long c0_bits = (cm_error >> 9) & 7;
+				unsigned long sc_bit = (cm_error >> 8) & 1;
+				unsigned long mcmd_bits = (cm_error >> 3) & 0x1f;
+				unsigned long sport_bits = (cm_error >> 0) & 7;
+				snprintf(buf, sizeof(buf),
+					 "C3=%s C2=%s C1=%s C0=%s SC=%s "
+					 "MCmd=%s SPort=%lu\n",
+					 core[c3_bits], core[c2_bits],
+					 core[c1_bits], core[c0_bits],
+					 sc_bit ? "True" : "False",
+					 mcmd[mcmd_bits], sport_bits);
+			}
+
+			ocause = (cm_other & GCMP_GCB_GMEO_ERROR_2ND_MSK) >>
+				 GCMP_GCB_GMEO_ERROR_2ND_SHF;
+
+			printk("CM_ERROR=%08lx %s <%s>\n", cm_error,
+			       causes[cause], buf);
+			printk("CM_ADDR =%08lx\n", cm_addr);
+			printk("CM_OTHER=%08lx %s\n", cm_other, causes[ocause]);
+
+			/* reprime cause register */
+			GCMPGCB(GCMEC) = 0;
+		}
+	}
+
+	return retval;
+}