1 files changed, 181 insertions, 59 deletions

diff --git a/arch/mips/kernel/irq-gic.c b/arch/mips/kernel/irq-gic.c
index 0c527f65219..88e4c323382 100644
--- a/arch/mips/kernel/irq-gic.c
+++ b/arch/mips/kernel/irq-gic.c
@@ -1,39 +1,142 @@
-#undef DEBUG
-
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2008 Ralf Baechle (ralf@linux-mips.org)
+ * Copyright (C) 2012 MIPS Technologies, Inc.  All rights reserved.
+ */
 #include <linux/bitmap.h>
 #include <linux/init.h>
 #include <linux/smp.h>
 #include <linux/irq.h>
+#include <linux/clocksource.h>
 
 #include <asm/io.h>
 #include <asm/gic.h>
-#include <asm/gcmpregs.h>
+#include <asm/setup.h>
+#include <asm/traps.h>
 #include <linux/hardirq.h>
 #include <asm-generic/bitops/find.h>
 
+unsigned int gic_frequency;
+unsigned int gic_present;
+unsigned long _gic_base;
+unsigned int gic_irq_base;
+unsigned int gic_irq_flags[GIC_NUM_INTRS];
 
-static unsigned long _gic_base;
-static unsigned int _irqbase;
-static unsigned int gic_irq_flags[GIC_NUM_INTRS];
-#define GIC_IRQ_FLAG_EDGE      0x0001
+/* The index into this array is the vector # of the interrupt. */
+struct gic_shared_intr_map gic_shared_intr_map[GIC_NUM_INTRS];
 
-struct gic_pcpu_mask pcpu_masks[NR_CPUS];
+static struct gic_pcpu_mask pcpu_masks[NR_CPUS];
 static struct gic_pending_regs pending_regs[NR_CPUS];
 static struct gic_intrmask_regs intrmask_regs[NR_CPUS];
 
+#if defined(CONFIG_CSRC_GIC) || defined(CONFIG_CEVT_GIC)
+cycle_t gic_read_count(void)
+{
+	unsigned int hi, hi2, lo;
+
+	do {
+		GICREAD(GIC_REG(SHARED, GIC_SH_COUNTER_63_32), hi);
+		GICREAD(GIC_REG(SHARED, GIC_SH_COUNTER_31_00), lo);
+		GICREAD(GIC_REG(SHARED, GIC_SH_COUNTER_63_32), hi2);
+	} while (hi2 != hi);
+
+	return (((cycle_t) hi) << 32) + lo;
+}
+
+void gic_write_compare(cycle_t cnt)
+{
+	GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI),
+				(int)(cnt >> 32));
+	GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO),
+				(int)(cnt & 0xffffffff));
+}
+
+void gic_write_cpu_compare(cycle_t cnt, int cpu)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), cpu);
+	GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_HI),
+				(int)(cnt >> 32));
+	GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_LO),
+				(int)(cnt & 0xffffffff));
+
+	local_irq_restore(flags);
+}
+
+cycle_t gic_read_compare(void)
+{
+	unsigned int hi, lo;
+
+	GICREAD(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI), hi);
+	GICREAD(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO), lo);
+
+	return (((cycle_t) hi) << 32) + lo;
+}
+#endif
+
+unsigned int gic_get_timer_pending(void)
+{
+	unsigned int vpe_pending;
+
+	GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), 0);
+	GICREAD(GIC_REG(VPE_OTHER, GIC_VPE_PEND), vpe_pending);
+	return (vpe_pending & GIC_VPE_PEND_TIMER_MSK);
+}
+
+void gic_bind_eic_interrupt(int irq, int set)
+{
+	/* Convert irq vector # to hw int # */
+	irq -= GIC_PIN_TO_VEC_OFFSET;
+
+	/* Set irq to use shadow set */
+	GICWRITE(GIC_REG_ADDR(VPE_LOCAL, GIC_VPE_EIC_SS(irq)), set);
+}
+
 void gic_send_ipi(unsigned int intr)
 {
-	pr_debug("CPU%d: %s status %08x\n", smp_processor_id(), __func__,
-		 read_c0_status());
 	GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), 0x80000000 | intr);
 }
 
-/* This is Malta specific and needs to be exported */
+static void gic_eic_irq_dispatch(void)
+{
+	unsigned int cause = read_c0_cause();
+	int irq;
+
+	irq = (cause & ST0_IM) >> STATUSB_IP2;
+	if (irq == 0)
+		irq = -1;
+
+	if (irq >= 0)
+		do_IRQ(gic_irq_base + irq);
+	else
+		spurious_interrupt();
+}
+
 static void __init vpe_local_setup(unsigned int numvpes)
 {
-	int i;
-	unsigned long timer_interrupt = 5, perf_interrupt = 5;
+	unsigned long timer_intr = GIC_INT_TMR;
+	unsigned long perf_intr = GIC_INT_PERFCTR;
 	unsigned int vpe_ctl;
+	int i;
+
+	if (cpu_has_veic) {
+		/*
+		 * GIC timer interrupt -> CPU HW Int X (vector X+2) ->
+		 * map to pin X+2-1 (since GIC adds 1)
+		 */
+		timer_intr += (GIC_CPU_TO_VEC_OFFSET - GIC_PIN_TO_VEC_OFFSET);
+		/*
+		 * GIC perfcnt interrupt -> CPU HW Int X (vector X+2) ->
+		 * map to pin X+2-1 (since GIC adds 1)
+		 */
+		perf_intr += (GIC_CPU_TO_VEC_OFFSET - GIC_PIN_TO_VEC_OFFSET);
+	}
 
 	/*
 	 * Setup the default performance counter timer interrupts
@@ -46,14 +149,34 @@ static void __init vpe_local_setup(unsigned int numvpes)
 		GICREAD(GIC_REG(VPE_OTHER, GIC_VPE_CTL), vpe_ctl);
 		if (vpe_ctl & GIC_VPE_CTL_TIMER_RTBL_MSK)
 			GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_TIMER_MAP),
-				 GIC_MAP_TO_PIN_MSK | timer_interrupt);
+				 GIC_MAP_TO_PIN_MSK | timer_intr);
+		if (cpu_has_veic) {
+			set_vi_handler(timer_intr + GIC_PIN_TO_VEC_OFFSET,
+				gic_eic_irq_dispatch);
+			gic_shared_intr_map[timer_intr + GIC_PIN_TO_VEC_OFFSET].local_intr_mask |= GIC_VPE_RMASK_TIMER_MSK;
+		}
 
 		if (vpe_ctl & GIC_VPE_CTL_PERFCNT_RTBL_MSK)
 			GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_PERFCTR_MAP),
-				 GIC_MAP_TO_PIN_MSK | perf_interrupt);
+				 GIC_MAP_TO_PIN_MSK | perf_intr);
+		if (cpu_has_veic) {
+			set_vi_handler(perf_intr + GIC_PIN_TO_VEC_OFFSET, gic_eic_irq_dispatch);
+			gic_shared_intr_map[perf_intr + GIC_PIN_TO_VEC_OFFSET].local_intr_mask |= GIC_VPE_RMASK_PERFCNT_MSK;
+		}
 	}
 }
 
+unsigned int gic_compare_int(void)
+{
+	unsigned int pending;
+
+	GICREAD(GIC_REG(VPE_LOCAL, GIC_VPE_PEND), pending);
+	if (pending & GIC_VPE_PEND_CMP_MSK)
+		return 1;
+	else
+		return 0;
+}
+
 unsigned int gic_get_int(void)
 {
 	unsigned int i;
@@ -80,67 +203,45 @@ unsigned int gic_get_int(void)
 	bitmap_and(pending, pending, intrmask, GIC_NUM_INTRS);
 	bitmap_and(pending, pending, pcpu_mask, GIC_NUM_INTRS);
 
-	i = find_first_bit(pending, GIC_NUM_INTRS);
-
-	pr_debug("CPU%d: %s pend=%d\n", smp_processor_id(), __func__, i);
-
-	return i;
-}
-
-static void gic_irq_ack(struct irq_data *d)
-{
-	unsigned int irq = d->irq - _irqbase;
-
-	pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
-	GIC_CLR_INTR_MASK(irq);
-
-	if (gic_irq_flags[irq] & GIC_IRQ_FLAG_EDGE)
-		GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), irq);
+	return find_first_bit(pending, GIC_NUM_INTRS);
 }
 
 static void gic_mask_irq(struct irq_data *d)
 {
-	unsigned int irq = d->irq - _irqbase;
-	pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
-	GIC_CLR_INTR_MASK(irq);
+	GIC_CLR_INTR_MASK(d->irq - gic_irq_base);
 }
 
 static void gic_unmask_irq(struct irq_data *d)
 {
-	unsigned int irq = d->irq - _irqbase;
-	pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
-	GIC_SET_INTR_MASK(irq);
+	GIC_SET_INTR_MASK(d->irq - gic_irq_base);
 }
 
 #ifdef CONFIG_SMP
-
 static DEFINE_SPINLOCK(gic_lock);
 
 static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
 			    bool force)
 {
-	unsigned int irq = d->irq - _irqbase;
+	unsigned int irq = (d->irq - gic_irq_base);
 	cpumask_t	tmp = CPU_MASK_NONE;
 	unsigned long	flags;
 	int		i;
 
-	pr_debug("%s(%d) called\n", __func__, irq);
 	cpumask_and(&tmp, cpumask, cpu_online_mask);
 	if (cpus_empty(tmp))
 		return -1;
 
 	/* Assumption : cpumask refers to a single CPU */
 	spin_lock_irqsave(&gic_lock, flags);
-	for (;;) {
-		/* Re-route this IRQ */
-		GIC_SH_MAP_TO_VPE_SMASK(irq, first_cpu(tmp));
 
-		/* Update the pcpu_masks */
-		for (i = 0; i < NR_CPUS; i++)
-			clear_bit(irq, pcpu_masks[i].pcpu_mask);
-		set_bit(irq, pcpu_masks[first_cpu(tmp)].pcpu_mask);
+	/* Re-route this IRQ */
+	GIC_SH_MAP_TO_VPE_SMASK(irq, first_cpu(tmp));
+
+	/* Update the pcpu_masks */
+	for (i = 0; i < NR_CPUS; i++)
+		clear_bit(irq, pcpu_masks[i].pcpu_mask);
+	set_bit(irq, pcpu_masks[first_cpu(tmp)].pcpu_mask);
 
-	}
 	cpumask_copy(d->affinity, cpumask);
 	spin_unlock_irqrestore(&gic_lock, flags);
 
@@ -154,7 +255,7 @@ static struct irq_chip gic_irq_controller = {
 	.irq_mask		=	gic_mask_irq,
 	.irq_mask_ack		=	gic_mask_irq,
 	.irq_unmask		=	gic_unmask_irq,
-	.irq_eoi		=	gic_unmask_irq,
+	.irq_eoi		=	gic_finish_irq,
 #ifdef CONFIG_SMP
 	.irq_set_affinity	=	gic_set_affinity,
 #endif
@@ -164,6 +265,8 @@ static void __init gic_setup_intr(unsigned int intr, unsigned int cpu,
 	unsigned int pin, unsigned int polarity, unsigned int trigtype,
 	unsigned int flags)
 {
+	struct gic_shared_intr_map *map_ptr;
+
 	/* Setup Intr to Pin mapping */
 	if (pin & GIC_MAP_TO_NMI_MSK) {
 		GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_PIN(intr)), pin);
@@ -178,6 +281,14 @@ static void __init gic_setup_intr(unsigned int intr, unsigned int cpu,
 			 GIC_MAP_TO_PIN_MSK | pin);
 		/* Setup Intr to CPU mapping */
 		GIC_SH_MAP_TO_VPE_SMASK(intr, cpu);
+		if (cpu_has_veic) {
+			set_vi_handler(pin + GIC_PIN_TO_VEC_OFFSET,
+				gic_eic_irq_dispatch);
+			map_ptr = &gic_shared_intr_map[pin + GIC_PIN_TO_VEC_OFFSET];
+			if (map_ptr->num_shared_intr >= GIC_MAX_SHARED_INTR)
+				BUG();
+			map_ptr->intr_list[map_ptr->num_shared_intr++] = intr;
+		}
 	}
 
 	/* Setup Intr Polarity */
@@ -191,26 +302,39 @@ static void __init gic_setup_intr(unsigned int intr, unsigned int cpu,
 	/* Initialise per-cpu Interrupt software masks */
 	if (flags & GIC_FLAG_IPI)
 		set_bit(intr, pcpu_masks[cpu].pcpu_mask);
-	if (flags & GIC_FLAG_TRANSPARENT)
+	if ((flags & GIC_FLAG_TRANSPARENT) && (cpu_has_veic == 0))
 		GIC_SET_INTR_MASK(intr);
 	if (trigtype == GIC_TRIG_EDGE)
-		gic_irq_flags[intr] |= GIC_IRQ_FLAG_EDGE;
+		gic_irq_flags[intr] |= GIC_TRIG_EDGE;
 }
 
 static void __init gic_basic_init(int numintrs, int numvpes,
 			struct gic_intr_map *intrmap, int mapsize)
 {
 	unsigned int i, cpu;
+	unsigned int pin_offset = 0;
+
+	board_bind_eic_interrupt = &gic_bind_eic_interrupt;
 
 	/* Setup defaults */
 	for (i = 0; i < numintrs; i++) {
 		GIC_SET_POLARITY(i, GIC_POL_POS);
 		GIC_SET_TRIGGER(i, GIC_TRIG_LEVEL);
 		GIC_CLR_INTR_MASK(i);
-		if (i < GIC_NUM_INTRS)
+		if (i < GIC_NUM_INTRS) {
 			gic_irq_flags[i] = 0;
+			gic_shared_intr_map[i].num_shared_intr = 0;
+			gic_shared_intr_map[i].local_intr_mask = 0;
+		}
 	}
 
+	/*
+	 * In EIC mode, the HW_INT# is offset by (2-1). Need to subtract
+	 * one because the GIC will add one (since 0=no intr).
+	 */
+	if (cpu_has_veic)
+		pin_offset = (GIC_CPU_TO_VEC_OFFSET - GIC_PIN_TO_VEC_OFFSET);
+
 	/* Setup specifics */
 	for (i = 0; i < mapsize; i++) {
 		cpu = intrmap[i].cpunum;
@@ -220,16 +344,13 @@ static void __init gic_basic_init(int numintrs, int numvpes,
 			continue;
 		gic_setup_intr(i,
 			intrmap[i].cpunum,
-			intrmap[i].pin,
+			intrmap[i].pin + pin_offset,
 			intrmap[i].polarity,
 			intrmap[i].trigtype,
 			intrmap[i].flags);
 	}
 
 	vpe_local_setup(numvpes);
-
-	for (i = _irqbase; i < (_irqbase + numintrs); i++)
-		irq_set_chip(i, &gic_irq_controller);
 }
 
 void __init gic_init(unsigned long gic_base_addr,
@@ -242,7 +363,7 @@ void __init gic_init(unsigned long gic_base_addr,
 
 	_gic_base = (unsigned long) ioremap_nocache(gic_base_addr,
 						    gic_addrspace_size);
-	_irqbase = irqbase;
+	gic_irq_base = irqbase;
 
 	GICREAD(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
 	numintrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
@@ -251,8 +372,9 @@ void __init gic_init(unsigned long gic_base_addr,
 
 	numvpes = (gicconfig & GIC_SH_CONFIG_NUMVPES_MSK) >>
 		  GIC_SH_CONFIG_NUMVPES_SHF;
-
-	pr_debug("%s called\n", __func__);
+	numvpes = numvpes + 1;
 
 	gic_basic_init(numintrs, numvpes, intr_map, intr_map_size);
+
+	gic_platform_init(numintrs, &gic_irq_controller);
 }