[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / sh / kernel / irq.c

/*
 * linux/arch/sh/kernel/irq.c
 *
 *	Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
 *
 *
 * SuperH version:  Copyright (C) 1999  Niibe Yutaka
 */
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/kernel_stat.h>
#include <linux/seq_file.h>
#include <linux/ftrace.h>
#include <linux/delay.h>
#include <asm/processor.h>
#include <asm/machvec.h>
#include <asm/uaccess.h>
#include <asm/thread_info.h>
#include <cpu/mmu_context.h>

atomic_t irq_err_count;

/*
 * 'what should we do if we get a hw irq event on an illegal vector'.
 * each architecture has to answer this themselves, it doesn't deserve
 * a generic callback i think.
 */
void ack_bad_irq(unsigned int irq)
{
	atomic_inc(&irq_err_count);
	printk("unexpected IRQ trap at vector %02x\n", irq);
}

#if defined(CONFIG_PROC_FS)
/*
 * /proc/interrupts printing:
 */
static int show_other_interrupts(struct seq_file *p, int prec)
{
	int j;

	seq_printf(p, "%*s: ", prec, "NMI");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", irq_stat[j].__nmi_count);
	seq_printf(p, "  Non-maskable interrupts\n");

	seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));

	return 0;
}

int show_interrupts(struct seq_file *p, void *v)
{
	unsigned long flags, any_count = 0;
	int i = *(loff_t *)v, j, prec;
	struct irqaction *action;
	struct irq_desc *desc;

	if (i > nr_irqs)
		return 0;

	for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
		j *= 10;

	if (i == nr_irqs)
		return show_other_interrupts(p, prec);

	if (i == 0) {
		seq_printf(p, "%*s", prec + 8, "");
		for_each_online_cpu(j)
			seq_printf(p, "CPU%-8d", j);
		seq_putc(p, '\n');
	}

	desc = irq_to_desc(i);
	if (!desc)
		return 0;

	raw_spin_lock_irqsave(&desc->lock, flags);
	for_each_online_cpu(j)
		any_count |= kstat_irqs_cpu(i, j);
	action = desc->action;
	if (!action && !any_count)
		goto out;

	seq_printf(p, "%*d: ", prec, i);
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
	seq_printf(p, " %14s", desc->chip->name);
	seq_printf(p, "-%-8s", desc->name);

	if (action) {
		seq_printf(p, "  %s", action->name);
		while ((action = action->next) != NULL)
			seq_printf(p, ", %s", action->name);
	}

	seq_putc(p, '\n');
out:
	raw_spin_unlock_irqrestore(&desc->lock, flags);
	return 0;
}
#endif

#ifdef CONFIG_IRQSTACKS
/*
 * per-CPU IRQ handling contexts (thread information and stack)
 */
union irq_ctx {
	struct thread_info	tinfo;
	u32			stack[THREAD_SIZE/sizeof(u32)];
};

static union irq_ctx *hardirq_ctx[NR_CPUS] __read_mostly;
static union irq_ctx *softirq_ctx[NR_CPUS] __read_mostly;

static char softirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss;
static char hardirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss;

static inline void handle_one_irq(unsigned int irq)
{
	union irq_ctx *curctx, *irqctx;

	curctx = (union irq_ctx *)current_thread_info();
	irqctx = hardirq_ctx[smp_processor_id()];

	/*
	 * this is where we switch to the IRQ stack. However, if we are
	 * already using the IRQ stack (because we interrupted a hardirq
	 * handler) we can't do that and just have to keep using the
	 * current stack (which is the irq stack already after all)
	 */
	if (curctx != irqctx) {
		u32 *isp;

		isp = (u32 *)((char *)irqctx + sizeof(*irqctx));
		irqctx->tinfo.task = curctx->tinfo.task;
		irqctx->tinfo.previous_sp = current_stack_pointer;

		/*
		 * Copy the softirq bits in preempt_count so that the
		 * softirq checks work in the hardirq context.
		 */
		irqctx->tinfo.preempt_count =
			(irqctx->tinfo.preempt_count & ~SOFTIRQ_MASK) |
			(curctx->tinfo.preempt_count & SOFTIRQ_MASK);

		__asm__ __volatile__ (
			"mov	%0, r4		\n"
			"mov	r15, r8		\n"
			"jsr	@%1		\n"
			/* swith to the irq stack */
			" mov	%2, r15		\n"
			/* restore the stack (ring zero) */
			"mov	r8, r15		\n"
			: /* no outputs */
			: "r" (irq), "r" (generic_handle_irq), "r" (isp)
			: "memory", "r0", "r1", "r2", "r3", "r4",
			  "r5", "r6", "r7", "r8", "t", "pr"
		);
	} else
		generic_handle_irq(irq);
}

/*
 * allocate per-cpu stacks for hardirq and for softirq processing
 */
void irq_ctx_init(int cpu)
{
	union irq_ctx *irqctx;

	if (hardirq_ctx[cpu])
		return;

	irqctx = (union irq_ctx *)&hardirq_stack[cpu * THREAD_SIZE];
	irqctx->tinfo.task		= NULL;
	irqctx->tinfo.exec_domain	= NULL;
	irqctx->tinfo.cpu		= cpu;
	irqctx->tinfo.preempt_count	= HARDIRQ_OFFSET;
	irqctx->tinfo.addr_limit	= MAKE_MM_SEG(0);

	hardirq_ctx[cpu] = irqctx;

	irqctx = (union irq_ctx *)&softirq_stack[cpu * THREAD_SIZE];
	irqctx->tinfo.task		= NULL;
	irqctx->tinfo.exec_domain	= NULL;
	irqctx->tinfo.cpu		= cpu;
	irqctx->tinfo.preempt_count	= 0;
	irqctx->tinfo.addr_limit	= MAKE_MM_SEG(0);

	softirq_ctx[cpu] = irqctx;

	printk("CPU %u irqstacks, hard=%p soft=%p\n",
		cpu, hardirq_ctx[cpu], softirq_ctx[cpu]);
}

void irq_ctx_exit(int cpu)
{
	hardirq_ctx[cpu] = NULL;
}

asmlinkage void do_softirq(void)
{
	unsigned long flags;
	struct thread_info *curctx;
	union irq_ctx *irqctx;
	u32 *isp;

	if (in_interrupt())
		return;

	local_irq_save(flags);

	if (local_softirq_pending()) {
		curctx = current_thread_info();
		irqctx = softirq_ctx[smp_processor_id()];
		irqctx->tinfo.task = curctx->task;
		irqctx->tinfo.previous_sp = current_stack_pointer;

		/* build the stack frame on the softirq stack */
		isp = (u32 *)((char *)irqctx + sizeof(*irqctx));

		__asm__ __volatile__ (
			"mov	r15, r9		\n"
			"jsr	@%0		\n"
			/* switch to the softirq stack */
			" mov	%1, r15		\n"
			/* restore the thread stack */
			"mov	r9, r15		\n"
			: /* no outputs */
			: "r" (__do_softirq), "r" (isp)
			: "memory", "r0", "r1", "r2", "r3", "r4",
			  "r5", "r6", "r7", "r8", "r9", "r15", "t", "pr"
		);

		/*
		 * Shouldnt happen, we returned above if in_interrupt():
		 */
		WARN_ON_ONCE(softirq_count());
	}

	local_irq_restore(flags);
}
#else
static inline void handle_one_irq(unsigned int irq)
{
	generic_handle_irq(irq);
}
#endif

asmlinkage __irq_entry int do_IRQ(unsigned int irq, struct pt_regs *regs)
{
	struct pt_regs *old_regs = set_irq_regs(regs);

	irq_enter();

	irq = irq_demux(irq_lookup(irq));

	if (irq != NO_IRQ_IGNORE) {
		handle_one_irq(irq);
		irq_finish(irq);
	}

	irq_exit();

	set_irq_regs(old_regs);

	return IRQ_HANDLED;
}

void __init init_IRQ(void)
{
	plat_irq_setup();

	/*
	 * Pin any of the legacy IRQ vectors that haven't already been
	 * grabbed by the platform
	 */
	reserve_irq_legacy();

	/* Perform the machine specific initialisation */
	if (sh_mv.mv_init_irq)
		sh_mv.mv_init_irq();

	irq_ctx_init(smp_processor_id());
}

#ifdef CONFIG_SPARSE_IRQ
int __init arch_probe_nr_irqs(void)
{
	nr_irqs = sh_mv.mv_nr_irqs;
	return 0;
}
#endif

#ifdef CONFIG_HOTPLUG_CPU
static void route_irq(struct irq_desc *desc, unsigned int irq, unsigned int cpu)
{
	printk(KERN_INFO "IRQ%u: moving from cpu%u to cpu%u\n",
	       irq, desc->node, cpu);

	raw_spin_lock_irq(&desc->lock);
	desc->chip->set_affinity(irq, cpumask_of(cpu));
	raw_spin_unlock_irq(&desc->lock);
}

/*
 * The CPU has been marked offline.  Migrate IRQs off this CPU.  If
 * the affinity settings do not allow other CPUs, force them onto any
 * available CPU.
 */
void migrate_irqs(void)
{
	struct irq_desc *desc;
	unsigned int irq, cpu = smp_processor_id();

	for_each_irq_desc(irq, desc) {
		if (desc->node == cpu) {
			unsigned int newcpu = cpumask_any_and(desc->affinity,
							      cpu_online_mask);
			if (newcpu >= nr_cpu_ids) {
				if (printk_ratelimit())
					printk(KERN_INFO "IRQ%u no longer affine to CPU%u\n",
					       irq, cpu);

				cpumask_setall(desc->affinity);
				newcpu = cpumask_any_and(desc->affinity,
							 cpu_online_mask);
			}

			route_irq(desc, irq, newcpu);
		}
	}
}
#endif
Commit	Line	Data
a6a31139	1	/*
1da177e4 LT	2	* linux/arch/sh/kernel/irq.c
	3	*
	4	* Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
	5	*
	6	*
	7	* SuperH version: Copyright (C) 1999 Niibe Yutaka
	8	*/
bf3a00f8	9	#include <linux/irq.h>
1da177e4	10	#include <linux/interrupt.h>
a6a31139	11	#include <linux/module.h>
bf3a00f8	12	#include <linux/kernel_stat.h>
1da177e4	13	#include <linux/seq_file.h>
ba93483f	14	#include <linux/ftrace.h>
763142d1	15	#include <linux/delay.h>
bf3a00f8	16	#include <asm/processor.h>
be782df5	17	#include <asm/machvec.h>
a6a31139 PM	18	#include <asm/uaccess.h>
a6a31139 PM	19	#include <asm/thread_info.h>
f15cbe6f	20	#include <cpu/mmu_context.h>
1da177e4	21
35f3c518 PM	22	atomic_t irq_err_count;
35f3c518 PM	23
1da177e4 LT	24	/*
	25	* 'what should we do if we get a hw irq event on an illegal vector'.
	26	* each architecture has to answer this themselves, it doesn't deserve
	27	* a generic callback i think.
	28	*/
	29	void ack_bad_irq(unsigned int irq)
	30	{
baf4326e	31	atomic_inc(&irq_err_count);
1da177e4 LT	32	printk("unexpected IRQ trap at vector %02x\n", irq);
	33	}
	34
	35	#if defined(CONFIG_PROC_FS)
fa1d43ab PM	36	/*
	37	* /proc/interrupts printing:
	38	*/
	39	static int show_other_interrupts(struct seq_file *p, int prec)
	40	{
731ba330 PM	41	int j;
	42
	43	seq_printf(p, "%*s: ", prec, "NMI");
	44	for_each_online_cpu(j)
	45	seq_printf(p, "%10u ", irq_stat[j].__nmi_count);
	46	seq_printf(p, " Non-maskable interrupts\n");
	47
fa1d43ab	48	seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
731ba330	49
fa1d43ab PM	50	return 0;
	51	}
	52
1da177e4 LT	53	int show_interrupts(struct seq_file p, void v)
1da177e4 LT	54	{
fa1d43ab PM	55	unsigned long flags, any_count = 0;
	56	int i = (loff_t )v, j, prec;
	57	struct irqaction *action;
	58	struct irq_desc *desc;
	59
	60	if (i > nr_irqs)
	61	return 0;
	62
	63	for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
	64	j *= 10;
	65
	66	if (i == nr_irqs)
	67	return show_other_interrupts(p, prec);
1da177e4 LT	68
1da177e4 LT	69	if (i == 0) {
fa1d43ab	70	seq_printf(p, "%*s", prec + 8, "");
394e3902	71	for_each_online_cpu(j)
fa1d43ab	72	seq_printf(p, "CPU%-8d", j);
1da177e4 LT	73	seq_putc(p, '\n');
	74	}
	75
fa1d43ab PM	76	desc = irq_to_desc(i);
	77	if (!desc)
	78	return 0;
	79
239007b8	80	raw_spin_lock_irqsave(&desc->lock, flags);
fa1d43ab PM	81	for_each_online_cpu(j)
	82	any_count \|= kstat_irqs_cpu(i, j);
	83	action = desc->action;
	84	if (!action && !any_count)
	85	goto out;
1da177e4	86
fa1d43ab PM	87	seq_printf(p, "%*d: ", prec, i);
	88	for_each_online_cpu(j)
	89	seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
	90	seq_printf(p, " %14s", desc->chip->name);
	91	seq_printf(p, "-%-8s", desc->name);
	92
	93	if (action) {
	94	seq_printf(p, " %s", action->name);
	95	while ((action = action->next) != NULL)
1da177e4	96	seq_printf(p, ", %s", action->name);
fa1d43ab	97	}
35f3c518	98
fa1d43ab PM	99	seq_putc(p, '\n');
fa1d43ab PM	100	out:
239007b8	101	raw_spin_unlock_irqrestore(&desc->lock, flags);
1da177e4 LT	102	return 0;
	103	}
	104	#endif
	105
110ed282	106	#ifdef CONFIG_IRQSTACKS
a6a31139 PM	107	/*
	108	* per-CPU IRQ handling contexts (thread information and stack)
	109	*/
	110	union irq_ctx {
	111	struct thread_info tinfo;
	112	u32 stack[THREAD_SIZE/sizeof(u32)];
	113	};
	114
1dc41e58 PM	115	static union irq_ctx *hardirq_ctx[NR_CPUS] __read_mostly;
1dc41e58 PM	116	static union irq_ctx *softirq_ctx[NR_CPUS] __read_mostly;
a6a31139	117
dc825b17 PM	118	static char softirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss;
	119	static char hardirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss;
	120
	121	static inline void handle_one_irq(unsigned int irq)
bf3a00f8	122	{
a6a31139	123	union irq_ctx curctx, irqctx;
a6a31139	124
a6a31139 PM	125	curctx = (union irq_ctx *)current_thread_info();
	126	irqctx = hardirq_ctx[smp_processor_id()];
	127
	128	/*
	129	* this is where we switch to the IRQ stack. However, if we are
	130	* already using the IRQ stack (because we interrupted a hardirq
	131	* handler) we can't do that and just have to keep using the
	132	* current stack (which is the irq stack already after all)
	133	*/
	134	if (curctx != irqctx) {
	135	u32 *isp;
	136
	137	isp = (u32 )((char )irqctx + sizeof(*irqctx));
	138	irqctx->tinfo.task = curctx->tinfo.task;
	139	irqctx->tinfo.previous_sp = current_stack_pointer;
	140
1dc41e58 PM	141	/*
	142	* Copy the softirq bits in preempt_count so that the
	143	* softirq checks work in the hardirq context.
	144	*/
	145	irqctx->tinfo.preempt_count =
	146	(irqctx->tinfo.preempt_count & ~SOFTIRQ_MASK) \|
	147	(curctx->tinfo.preempt_count & SOFTIRQ_MASK);
	148
a6a31139 PM	149	__asm__ __volatile__ (
a6a31139 PM	150	"mov %0, r4 \n"
1dc41e58	151	"mov r15, r8 \n"
baf4326e	152	"jsr @%1 \n"
a6a31139	153	/* swith to the irq stack */
baf4326e	154	" mov %2, r15 \n"
a6a31139	155	/* restore the stack (ring zero) */
1dc41e58	156	"mov r8, r15 \n"
a6a31139	157	: /* no outputs */
35f3c518	158	: "r" (irq), "r" (generic_handle_irq), "r" (isp)
a6a31139 PM	159	: "memory", "r0", "r1", "r2", "r3", "r4",
	160	"r5", "r6", "r7", "r8", "t", "pr"
	161	);
	162	} else
35f3c518	163	generic_handle_irq(irq);
1da177e4	164	}
a6a31139	165
a6a31139 PM	166	/*
	167	* allocate per-cpu stacks for hardirq and for softirq processing
	168	*/
	169	void irq_ctx_init(int cpu)
	170	{
	171	union irq_ctx *irqctx;
	172
	173	if (hardirq_ctx[cpu])
	174	return;
	175
	176	irqctx = (union irq_ctx )&hardirq_stack[cpu THREAD_SIZE];
	177	irqctx->tinfo.task = NULL;
	178	irqctx->tinfo.exec_domain = NULL;
	179	irqctx->tinfo.cpu = cpu;
	180	irqctx->tinfo.preempt_count = HARDIRQ_OFFSET;
	181	irqctx->tinfo.addr_limit = MAKE_MM_SEG(0);
	182
	183	hardirq_ctx[cpu] = irqctx;
	184
	185	irqctx = (union irq_ctx )&softirq_stack[cpu THREAD_SIZE];
	186	irqctx->tinfo.task = NULL;
	187	irqctx->tinfo.exec_domain = NULL;
	188	irqctx->tinfo.cpu = cpu;
1dc41e58	189	irqctx->tinfo.preempt_count = 0;
a6a31139 PM	190	irqctx->tinfo.addr_limit = MAKE_MM_SEG(0);
	191
	192	softirq_ctx[cpu] = irqctx;
	193
	194	printk("CPU %u irqstacks, hard=%p soft=%p\n",
	195	cpu, hardirq_ctx[cpu], softirq_ctx[cpu]);
	196	}
	197
	198	void irq_ctx_exit(int cpu)
	199	{
	200	hardirq_ctx[cpu] = NULL;
	201	}
	202
a6a31139 PM	203	asmlinkage void do_softirq(void)
	204	{
	205	unsigned long flags;
	206	struct thread_info *curctx;
	207	union irq_ctx *irqctx;
	208	u32 *isp;
	209
	210	if (in_interrupt())
	211	return;
	212
	213	local_irq_save(flags);
	214
	215	if (local_softirq_pending()) {
	216	curctx = current_thread_info();
	217	irqctx = softirq_ctx[smp_processor_id()];
	218	irqctx->tinfo.task = curctx->task;
	219	irqctx->tinfo.previous_sp = current_stack_pointer;
	220
	221	/* build the stack frame on the softirq stack */
	222	isp = (u32 )((char )irqctx + sizeof(*irqctx));
	223
	224	__asm__ __volatile__ (
	225	"mov r15, r9 \n"
	226	"jsr @%0 \n"
	227	/* switch to the softirq stack */
	228	" mov %1, r15 \n"
	229	/* restore the thread stack */
	230	"mov r9, r15 \n"
	231	: /* no outputs */
	232	: "r" (__do_softirq), "r" (isp)
a6a31139 PM	233	: "memory", "r0", "r1", "r2", "r3", "r4",
	234	"r5", "r6", "r7", "r8", "r9", "r15", "t", "pr"
	235	);
1dc41e58 PM	236
	237	/*
	238	* Shouldnt happen, we returned above if in_interrupt():
	239	*/
	240	WARN_ON_ONCE(softirq_count());
a6a31139 PM	241	}
	242
	243	local_irq_restore(flags);
	244	}
dc825b17 PM	245	#else
	246	static inline void handle_one_irq(unsigned int irq)
	247	{
	248	generic_handle_irq(irq);
	249	}
a6a31139	250	#endif
ea0f8fea	251
dc825b17 PM	252	asmlinkage __irq_entry int do_IRQ(unsigned int irq, struct pt_regs *regs)
	253	{
	254	struct pt_regs *old_regs = set_irq_regs(regs);
	255
	256	irq_enter();
	257
	258	irq = irq_demux(irq_lookup(irq));
	259
	260	if (irq != NO_IRQ_IGNORE) {
	261	handle_one_irq(irq);
	262	irq_finish(irq);
	263	}
	264
	265	irq_exit();
	266
	267	set_irq_regs(old_regs);
	268
	269	return IRQ_HANDLED;
	270	}
	271
ea0f8fea JL	272	void __init init_IRQ(void)
ea0f8fea JL	273	{
90015c89	274	plat_irq_setup();
ea0f8fea	275
45b9deaf PM	276	/*
	277	* Pin any of the legacy IRQ vectors that haven't already been
	278	* grabbed by the platform
	279	*/
	280	reserve_irq_legacy();
	281
ea0f8fea JL	282	/* Perform the machine specific initialisation */
	283	if (sh_mv.mv_init_irq)
	284	sh_mv.mv_init_irq();
	285
	286	irq_ctx_init(smp_processor_id());
	287	}
d8586ba6 PM	288
	289	#ifdef CONFIG_SPARSE_IRQ
	290	int __init arch_probe_nr_irqs(void)
	291	{
	292	nr_irqs = sh_mv.mv_nr_irqs;
	293	return 0;
	294	}
	295	#endif
763142d1 PM	296
	297	#ifdef CONFIG_HOTPLUG_CPU
	298	static void route_irq(struct irq_desc *desc, unsigned int irq, unsigned int cpu)
	299	{
	300	printk(KERN_INFO "IRQ%u: moving from cpu%u to cpu%u\n",
	301	irq, desc->node, cpu);
	302
	303	raw_spin_lock_irq(&desc->lock);
	304	desc->chip->set_affinity(irq, cpumask_of(cpu));
	305	raw_spin_unlock_irq(&desc->lock);
	306	}
	307
	308	/*
	309	* The CPU has been marked offline. Migrate IRQs off this CPU. If
	310	* the affinity settings do not allow other CPUs, force them onto any
	311	* available CPU.
	312	*/
	313	void migrate_irqs(void)
	314	{
	315	struct irq_desc *desc;
	316	unsigned int irq, cpu = smp_processor_id();
	317
	318	for_each_irq_desc(irq, desc) {
	319	if (desc->node == cpu) {
	320	unsigned int newcpu = cpumask_any_and(desc->affinity,
	321	cpu_online_mask);
	322	if (newcpu >= nr_cpu_ids) {
	323	if (printk_ratelimit())
	324	printk(KERN_INFO "IRQ%u no longer affine to CPU%u\n",
	325	irq, cpu);
	326
	327	cpumask_setall(desc->affinity);
	328	newcpu = cpumask_any_and(desc->affinity,
	329	cpu_online_mask);
	330	}
	331
	332	route_irq(desc, irq, newcpu);
	333	}
	334	}
	335	}
	336	#endif