arch/mips/kernel/irq-gic.c - maze/linux - Git at Google

 #undef DEBUG

 #include <linux/bitmap.h>
 #include <linux/init.h>
 #include <linux/smp.h>

 #include <asm/io.h>
 #include <asm/gic.h>
 #include <asm/gcmpregs.h>
 #include <asm/irq.h>
 #include <linux/hardirq.h>
 #include <asm-generic/bitops/find.h>


 static unsigned long _gic_base;
 static unsigned int _irqbase;
 static unsigned int gic_irq_flags[GIC_NUM_INTRS];
 #define GIC_IRQ_FLAG_EDGE      0x0001

 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];

 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 __init vpe_local_setup(unsigned int numvpes)
 {
 	int i;
 	unsigned long timer_interrupt = 5, perf_interrupt = 5;
 	unsigned int vpe_ctl;

 	/*
 	 * Setup the default performance counter timer interrupts
 	 * for all VPEs
 	 */
 	for (i = 0; i < numvpes; i++) {
 		GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);

 		/* Are Interrupts locally routable? */
 		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);

 		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);
 	}
 }

 unsigned int gic_get_int(void)
 {
 	unsigned int i;
 	unsigned long *pending, *intrmask, *pcpu_mask;
 	unsigned long *pending_abs, *intrmask_abs;

 	/* Get per-cpu bitmaps */
 	pending = pending_regs[smp_processor_id()].pending;
 	intrmask = intrmask_regs[smp_processor_id()].intrmask;
 	pcpu_mask = pcpu_masks[smp_processor_id()].pcpu_mask;

 	pending_abs = (unsigned long *) GIC_REG_ABS_ADDR(SHARED,
 							 GIC_SH_PEND_31_0_OFS);
 	intrmask_abs = (unsigned long *) GIC_REG_ABS_ADDR(SHARED,
 							  GIC_SH_MASK_31_0_OFS);

 	for (i = 0; i < BITS_TO_LONGS(GIC_NUM_INTRS); i++) {
 		GICREAD(*pending_abs, pending[i]);
 		GICREAD(*intrmask_abs, intrmask[i]);
 		pending_abs++;
 		intrmask_abs++;
 	}

 	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 unsigned int gic_irq_startup(unsigned int irq)
 {
 	irq -= _irqbase;
 	pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
 	GIC_SET_INTR_MASK(irq);
 	return 0;
 }

 static void gic_irq_ack(unsigned int irq)
 {
 	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);
 }

 static void gic_mask_irq(unsigned int irq)
 {
 	irq -= _irqbase;
 	pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
 	GIC_CLR_INTR_MASK(irq);
 }

 static void gic_unmask_irq(unsigned int irq)
 {
 	irq -= _irqbase;
 	pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
 	GIC_SET_INTR_MASK(irq);
 }

 #ifdef CONFIG_SMP

 static DEFINE_SPINLOCK(gic_lock);

 static int gic_set_affinity(unsigned int irq, const struct cpumask *cpumask)
 {
 	cpumask_t	tmp = CPU_MASK_NONE;
 	unsigned long	flags;
 	int		i;

 	irq -= _irqbase;
 	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);

 	}
 	cpumask_copy(irq_desc[irq].affinity, cpumask);
 	spin_unlock_irqrestore(&gic_lock, flags);

 	return 0;
 }
 #endif

 static struct irq_chip gic_irq_controller = {
 	.name		=	"MIPS GIC",
 	.startup	=	gic_irq_startup,
 	.ack		=	gic_irq_ack,
 	.mask		=	gic_mask_irq,
 	.mask_ack	=	gic_mask_irq,
 	.unmask		=	gic_unmask_irq,
 	.eoi		=	gic_unmask_irq,
 #ifdef CONFIG_SMP
 	.set_affinity	=	gic_set_affinity,
 #endif
 };

 static void __init gic_setup_intr(unsigned int intr, unsigned int cpu,
 	unsigned int pin, unsigned int polarity, unsigned int trigtype,
 	unsigned int flags)
 {
 	/* Setup Intr to Pin mapping */
 	if (pin & GIC_MAP_TO_NMI_MSK) {
 		GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_PIN(intr)), pin);
 		/* FIXME: hack to route NMI to all cpu's */
 		for (cpu = 0; cpu < NR_CPUS; cpu += 32) {
 			GICWRITE(GIC_REG_ADDR(SHARED,
 					  GIC_SH_MAP_TO_VPE_REG_OFF(intr, cpu)),
 				 0xffffffff);
 		}
 	} else {
 		GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_PIN(intr)),
 			 GIC_MAP_TO_PIN_MSK | pin);
 		/* Setup Intr to CPU mapping */
 		GIC_SH_MAP_TO_VPE_SMASK(intr, cpu);
 	}

 	/* Setup Intr Polarity */
 	GIC_SET_POLARITY(intr, polarity);

 	/* Setup Intr Trigger Type */
 	GIC_SET_TRIGGER(intr, trigtype);

 	/* Init Intr Masks */
 	GIC_CLR_INTR_MASK(intr);
 	/* Initialise per-cpu Interrupt software masks */
 	if (flags & GIC_FLAG_IPI)
 		set_bit(intr, pcpu_masks[cpu].pcpu_mask);
 	if (flags & GIC_FLAG_TRANSPARENT)
 		GIC_SET_INTR_MASK(intr);
 	if (trigtype == GIC_TRIG_EDGE)
 		gic_irq_flags[intr] |= GIC_IRQ_FLAG_EDGE;
 }

 static void __init gic_basic_init(int numintrs, int numvpes,
 			struct gic_intr_map *intrmap, int mapsize)
 {
 	unsigned int i, cpu;

 	/* 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)
 			gic_irq_flags[i] = 0;
 	}

 	/* Setup specifics */
 	for (i = 0; i < mapsize; i++) {
 		cpu = intrmap[i].cpunum;
 		if (cpu == GIC_UNUSED)
 			continue;
 		if (cpu == 0 && i != 0 && intrmap[i].flags == 0)
 			continue;
 		gic_setup_intr(i,
 			intrmap[i].cpunum,
 			intrmap[i].pin,
 			intrmap[i].polarity,
 			intrmap[i].trigtype,
 			intrmap[i].flags);
 	}

 	vpe_local_setup(numvpes);

 	for (i = _irqbase; i < (_irqbase + numintrs); i++)
 		set_irq_chip(i, &gic_irq_controller);
 }

 void __init gic_init(unsigned long gic_base_addr,
 		     unsigned long gic_addrspace_size,
 		     struct gic_intr_map *intr_map, unsigned int intr_map_size,
 		     unsigned int irqbase)
 {
 	unsigned int gicconfig;
 	int numvpes, numintrs;

 	_gic_base = (unsigned long) ioremap_nocache(gic_base_addr,
 						    gic_addrspace_size);
 	_irqbase = irqbase;

 	GICREAD(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
 	numintrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
 		   GIC_SH_CONFIG_NUMINTRS_SHF;
 	numintrs = ((numintrs + 1) * 8);

 	numvpes = (gicconfig & GIC_SH_CONFIG_NUMVPES_MSK) >>
 		  GIC_SH_CONFIG_NUMVPES_SHF;

 	pr_debug("%s called\n", __func__);

 	gic_basic_init(numintrs, numvpes, intr_map, intr_map_size);
 }
	#undef DEBUG

	#include <linux/bitmap.h>
	#include <linux/init.h>
	#include <linux/smp.h>

	#include <asm/io.h>
	#include <asm/gic.h>
	#include <asm/gcmpregs.h>
	#include <asm/irq.h>
	#include <linux/hardirq.h>
	#include <asm-generic/bitops/find.h>


	static unsigned long _gic_base;
	static unsigned int _irqbase;
	static unsigned int gic_irq_flags[GIC_NUM_INTRS];
	#define GIC_IRQ_FLAG_EDGE 0x0001

	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];

	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 __init vpe_local_setup(unsigned int numvpes)
	{
	int i;
	unsigned long timer_interrupt = 5, perf_interrupt = 5;
	unsigned int vpe_ctl;

	/*
	* Setup the default performance counter timer interrupts
	* for all VPEs
	*/
	for (i = 0; i < numvpes; i++) {
	GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);

	/* Are Interrupts locally routable? */
	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);

	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);
	}
	}

	unsigned int gic_get_int(void)
	{
	unsigned int i;
	unsigned long pending, intrmask, *pcpu_mask;
	unsigned long pending_abs, intrmask_abs;

	/* Get per-cpu bitmaps */
	pending = pending_regs[smp_processor_id()].pending;
	intrmask = intrmask_regs[smp_processor_id()].intrmask;
	pcpu_mask = pcpu_masks[smp_processor_id()].pcpu_mask;

	pending_abs = (unsigned long *) GIC_REG_ABS_ADDR(SHARED,
	GIC_SH_PEND_31_0_OFS);
	intrmask_abs = (unsigned long *) GIC_REG_ABS_ADDR(SHARED,
	GIC_SH_MASK_31_0_OFS);

	for (i = 0; i < BITS_TO_LONGS(GIC_NUM_INTRS); i++) {
	GICREAD(*pending_abs, pending[i]);
	GICREAD(*intrmask_abs, intrmask[i]);
	pending_abs++;
	intrmask_abs++;
	}

	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 unsigned int gic_irq_startup(unsigned int irq)
	{
	irq -= _irqbase;
	pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
	GIC_SET_INTR_MASK(irq);
	return 0;
	}

	static void gic_irq_ack(unsigned int irq)
	{
	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);
	}

	static void gic_mask_irq(unsigned int irq)
	{
	irq -= _irqbase;
	pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
	GIC_CLR_INTR_MASK(irq);
	}

	static void gic_unmask_irq(unsigned int irq)
	{
	irq -= _irqbase;
	pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
	GIC_SET_INTR_MASK(irq);
	}

	#ifdef CONFIG_SMP

	static DEFINE_SPINLOCK(gic_lock);

	static int gic_set_affinity(unsigned int irq, const struct cpumask *cpumask)
	{
	cpumask_t tmp = CPU_MASK_NONE;
	unsigned long flags;
	int i;

	irq -= _irqbase;
	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);

	}
	cpumask_copy(irq_desc[irq].affinity, cpumask);
	spin_unlock_irqrestore(&gic_lock, flags);

	return 0;
	}
	#endif

	static struct irq_chip gic_irq_controller = {
	.name = "MIPS GIC",
	.startup = gic_irq_startup,
	.ack = gic_irq_ack,
	.mask = gic_mask_irq,
	.mask_ack = gic_mask_irq,
	.unmask = gic_unmask_irq,
	.eoi = gic_unmask_irq,
	#ifdef CONFIG_SMP
	.set_affinity = gic_set_affinity,
	#endif
	};

	static void __init gic_setup_intr(unsigned int intr, unsigned int cpu,
	unsigned int pin, unsigned int polarity, unsigned int trigtype,
	unsigned int flags)
	{
	/* Setup Intr to Pin mapping */
	if (pin & GIC_MAP_TO_NMI_MSK) {
	GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_PIN(intr)), pin);
	/* FIXME: hack to route NMI to all cpu's */
	for (cpu = 0; cpu < NR_CPUS; cpu += 32) {
	GICWRITE(GIC_REG_ADDR(SHARED,
	GIC_SH_MAP_TO_VPE_REG_OFF(intr, cpu)),
	0xffffffff);
	}
	} else {
	GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_PIN(intr)),
	GIC_MAP_TO_PIN_MSK \| pin);
	/* Setup Intr to CPU mapping */
	GIC_SH_MAP_TO_VPE_SMASK(intr, cpu);
	}

	/* Setup Intr Polarity */
	GIC_SET_POLARITY(intr, polarity);

	/* Setup Intr Trigger Type */
	GIC_SET_TRIGGER(intr, trigtype);

	/* Init Intr Masks */
	GIC_CLR_INTR_MASK(intr);
	/* Initialise per-cpu Interrupt software masks */
	if (flags & GIC_FLAG_IPI)
	set_bit(intr, pcpu_masks[cpu].pcpu_mask);
	if (flags & GIC_FLAG_TRANSPARENT)
	GIC_SET_INTR_MASK(intr);
	if (trigtype == GIC_TRIG_EDGE)
	gic_irq_flags[intr] \|= GIC_IRQ_FLAG_EDGE;
	}

	static void __init gic_basic_init(int numintrs, int numvpes,
	struct gic_intr_map *intrmap, int mapsize)
	{
	unsigned int i, cpu;

	/* 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)
	gic_irq_flags[i] = 0;
	}

	/* Setup specifics */
	for (i = 0; i < mapsize; i++) {
	cpu = intrmap[i].cpunum;
	if (cpu == GIC_UNUSED)
	continue;
	if (cpu == 0 && i != 0 && intrmap[i].flags == 0)
	continue;
	gic_setup_intr(i,
	intrmap[i].cpunum,
	intrmap[i].pin,
	intrmap[i].polarity,
	intrmap[i].trigtype,
	intrmap[i].flags);
	}

	vpe_local_setup(numvpes);

	for (i = _irqbase; i < (_irqbase + numintrs); i++)
	set_irq_chip(i, &gic_irq_controller);
	}

	void __init gic_init(unsigned long gic_base_addr,
	unsigned long gic_addrspace_size,
	struct gic_intr_map *intr_map, unsigned int intr_map_size,
	unsigned int irqbase)
	{
	unsigned int gicconfig;
	int numvpes, numintrs;

	_gic_base = (unsigned long) ioremap_nocache(gic_base_addr,
	gic_addrspace_size);
	_irqbase = irqbase;

	GICREAD(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
	numintrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
	GIC_SH_CONFIG_NUMINTRS_SHF;
	numintrs = ((numintrs + 1) * 8);

	numvpes = (gicconfig & GIC_SH_CONFIG_NUMVPES_MSK) >>
	GIC_SH_CONFIG_NUMVPES_SHF;

	pr_debug("%s called\n", __func__);

	gic_basic_init(numintrs, numvpes, intr_map, intr_map_size);
	}