[deliverable/linux.git] / arch / m68k / q40 / q40ints.c

/*
 * arch/m68k/q40/q40ints.c
 *
 * Copyright (C) 1999,2001 Richard Zidlicky
 *
 * 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.
 *
 * .. used to be loosely based on bvme6000ints.c
 *
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/irq.h>

#include <asm/ptrace.h>
#include <asm/traps.h>

#include <asm/q40_master.h>
#include <asm/q40ints.h>

/*
 * Q40 IRQs are defined as follows:
 *            3,4,5,6,7,10,11,14,15 : ISA dev IRQs
 *            16-31: reserved
 *            32   : keyboard int
 *            33   : frame int (50/200 Hz periodic timer)
 *            34   : sample int (10/20 KHz periodic timer)
 *
*/

static void q40_irq_handler(unsigned int, struct pt_regs *fp);
static void q40_irq_enable(struct irq_data *data);
static void q40_irq_disable(struct irq_data *data);

unsigned short q40_ablecount[35];
unsigned short q40_state[35];

static unsigned int q40_irq_startup(struct irq_data *data)
{
	unsigned int irq = data->irq;

	/* test for ISA ints not implemented by HW */
	switch (irq) {
	case 1: case 2: case 8: case 9:
	case 11: case 12: case 13:
		printk("%s: ISA IRQ %d not implemented by HW\n", __func__, irq);
		/* FIXME return -ENXIO; */
	}
	return 0;
}

static void q40_irq_shutdown(struct irq_data *data)
{
}

static struct irq_chip q40_irq_chip = {
	.name		= "q40",
	.irq_startup	= q40_irq_startup,
	.irq_shutdown	= q40_irq_shutdown,
	.irq_enable	= q40_irq_enable,
	.irq_disable	= q40_irq_disable,
};

/*
 * void q40_init_IRQ (void)
 *
 * Parameters:	None
 *
 * Returns:	Nothing
 *
 * This function is called during kernel startup to initialize
 * the q40 IRQ handling routines.
 */

static int disabled;

void __init q40_init_IRQ(void)
{
	m68k_setup_irq_controller(&q40_irq_chip, handle_simple_irq, 1,
				  Q40_IRQ_MAX);

	/* setup handler for ISA ints */
	m68k_setup_auto_interrupt(q40_irq_handler);

	m68k_irq_startup_irq(IRQ_AUTO_2);
	m68k_irq_startup_irq(IRQ_AUTO_4);

	/* now enable some ints.. */
	master_outb(1, EXT_ENABLE_REG);  /* ISA IRQ 5-15 */

	/* make sure keyboard IRQ is disabled */
	master_outb(0, KEY_IRQ_ENABLE_REG);
}


/*
 * this stuff doesn't really belong here..
 */

int ql_ticks;              /* 200Hz ticks since last jiffie */
static int sound_ticks;

#define SVOL 45

void q40_mksound(unsigned int hz, unsigned int ticks)
{
	/* for now ignore hz, except that hz==0 switches off sound */
	/* simply alternate the ampl (128-SVOL)-(128+SVOL)-..-.. at 200Hz */
	if (hz == 0) {
		if (sound_ticks)
			sound_ticks = 1;

		*DAC_LEFT = 128;
		*DAC_RIGHT = 128;

		return;
	}
	/* sound itself is done in q40_timer_int */
	if (sound_ticks == 0)
		sound_ticks = 1000; /* pretty long beep */
	sound_ticks = ticks << 1;
}

static irq_handler_t q40_timer_routine;

static irqreturn_t q40_timer_int (int irq, void * dev)
{
	ql_ticks = ql_ticks ? 0 : 1;
	if (sound_ticks) {
		unsigned char sval=(sound_ticks & 1) ? 128-SVOL : 128+SVOL;
		sound_ticks--;
		*DAC_LEFT=sval;
		*DAC_RIGHT=sval;
	}

	if (!ql_ticks)
		q40_timer_routine(irq, dev);
	return IRQ_HANDLED;
}

void q40_sched_init (irq_handler_t timer_routine)
{
	int timer_irq;

	q40_timer_routine = timer_routine;
	timer_irq = Q40_IRQ_FRAME;

	if (request_irq(timer_irq, q40_timer_int, 0,
				"timer", q40_timer_int))
		panic("Couldn't register timer int");

	master_outb(-1, FRAME_CLEAR_REG);
	master_outb( 1, FRAME_RATE_REG);
}


/*
 * tables to translate bits into IRQ numbers
 * it is a good idea to order the entries by priority
 *
*/

struct IRQ_TABLE{ unsigned mask; int irq ;};
#if 0
static struct IRQ_TABLE iirqs[]={
  {Q40_IRQ_FRAME_MASK,Q40_IRQ_FRAME},
  {Q40_IRQ_KEYB_MASK,Q40_IRQ_KEYBOARD},
  {0,0}};
#endif
static struct IRQ_TABLE eirqs[] = {
  { .mask = Q40_IRQ3_MASK,	.irq = 3 },	/* ser 1 */
  { .mask = Q40_IRQ4_MASK,	.irq = 4 },	/* ser 2 */
  { .mask = Q40_IRQ14_MASK,	.irq = 14 },	/* IDE 1 */
  { .mask = Q40_IRQ15_MASK,	.irq = 15 },	/* IDE 2 */
  { .mask = Q40_IRQ6_MASK,	.irq = 6 },	/* floppy, handled elsewhere */
  { .mask = Q40_IRQ7_MASK,	.irq = 7 },	/* par */
  { .mask = Q40_IRQ5_MASK,	.irq = 5 },
  { .mask = Q40_IRQ10_MASK,	.irq = 10 },
  {0,0}
};

/* complain only this many times about spurious ints : */
static int ccleirq=60;    /* ISA dev IRQs*/
/*static int cclirq=60;*/     /* internal */

/* FIXME: add shared ints,mask,unmask,probing.... */

#define IRQ_INPROGRESS 1
/*static unsigned short saved_mask;*/
//static int do_tint=0;

#define DEBUG_Q40INT
/*#define IP_USE_DISABLE *//* would be nice, but crashes ???? */

static int mext_disabled=0;  /* ext irq disabled by master chip? */
static int aliased_irq=0;  /* how many times inside handler ?*/


/* got interrupt, dispatch to ISA or keyboard/timer IRQs */
static void q40_irq_handler(unsigned int irq, struct pt_regs *fp)
{
	unsigned mir, mer;
	int i;

//repeat:
	mir = master_inb(IIRQ_REG);
#ifdef CONFIG_BLK_DEV_FD
	if ((mir & Q40_IRQ_EXT_MASK) &&
	    (master_inb(EIRQ_REG) & Q40_IRQ6_MASK)) {
		floppy_hardint();
		return;
	}
#endif
	switch (irq) {
	case 4:
	case 6:
		do_IRQ(Q40_IRQ_SAMPLE, fp);
		return;
	}
	if (mir & Q40_IRQ_FRAME_MASK) {
		do_IRQ(Q40_IRQ_FRAME, fp);
		master_outb(-1, FRAME_CLEAR_REG);
	}
	if ((mir & Q40_IRQ_SER_MASK) || (mir & Q40_IRQ_EXT_MASK)) {
		mer = master_inb(EIRQ_REG);
		for (i = 0; eirqs[i].mask; i++) {
			if (mer & eirqs[i].mask) {
				irq = eirqs[i].irq;
/*
 * There is a little mess wrt which IRQ really caused this irq request. The
 * main problem is that IIRQ_REG and EIRQ_REG reflect the state when they
 * are read - which is long after the request came in. In theory IRQs should
 * not just go away but they occasionally do
 */
				if (irq > 4 && irq <= 15 && mext_disabled) {
					/*aliased_irq++;*/
					goto iirq;
				}
				if (q40_state[irq] & IRQ_INPROGRESS) {
					/* some handlers do local_irq_enable() for irq latency reasons, */
					/* however reentering an active irq handler is not permitted */
#ifdef IP_USE_DISABLE
					/* in theory this is the better way to do it because it still */
					/* lets through eg the serial irqs, unfortunately it crashes */
					disable_irq(irq);
					disabled = 1;
#else
					/*printk("IRQ_INPROGRESS detected for irq %d, disabling - %s disabled\n",
						irq, disabled ? "already" : "not yet"); */
					fp->sr = (((fp->sr) & (~0x700))+0x200);
					disabled = 1;
#endif
					goto iirq;
				}
				q40_state[irq] |= IRQ_INPROGRESS;
				do_IRQ(irq, fp);
				q40_state[irq] &= ~IRQ_INPROGRESS;

				/* naively enable everything, if that fails than    */
				/* this function will be reentered immediately thus */
				/* getting another chance to disable the IRQ        */

				if (disabled) {
#ifdef IP_USE_DISABLE
					if (irq > 4) {
						disabled = 0;
						enable_irq(irq);
					}
#else
					disabled = 0;
					/*printk("reenabling irq %d\n", irq); */
#endif
				}
// used to do 'goto repeat;' here, this delayed bh processing too long
				return;
			}
		}
		if (mer && ccleirq > 0 && !aliased_irq) {
			printk("ISA interrupt from unknown source? EIRQ_REG = %x\n",mer);
			ccleirq--;
		}
	}
 iirq:
	mir = master_inb(IIRQ_REG);
	/* should test whether keyboard irq is really enabled, doing it in defhand */
	if (mir & Q40_IRQ_KEYB_MASK)
		do_IRQ(Q40_IRQ_KEYBOARD, fp);

	return;
}

void q40_irq_enable(struct irq_data *data)
{
	unsigned int irq = data->irq;

	if (irq >= 5 && irq <= 15) {
		mext_disabled--;
		if (mext_disabled > 0)
			printk("q40_irq_enable : nested disable/enable\n");
		if (mext_disabled == 0)
			master_outb(1, EXT_ENABLE_REG);
	}
}


void q40_irq_disable(struct irq_data *data)
{
	unsigned int irq = data->irq;

	/* disable ISA iqs : only do something if the driver has been
	 * verified to be Q40 "compatible" - right now IDE, NE2K
	 * Any driver should not attempt to sleep across disable_irq !!
	 */

	if (irq >= 5 && irq <= 15) {
		master_outb(0, EXT_ENABLE_REG);
		mext_disabled++;
		if (mext_disabled > 1)
			printk("disable_irq nesting count %d\n",mext_disabled);
	}
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* arch/m68k/q40/q40ints.c
	3	*
	4	* Copyright (C) 1999,2001 Richard Zidlicky
	5	*
	6	* This file is subject to the terms and conditions of the GNU General Public
	7	* License. See the file COPYING in the main directory of this archive
	8	* for more details.
	9	*
	10	* .. used to be loosely based on bvme6000ints.c
	11	*
	12	*/
	13
	14	#include <linux/types.h>
	15	#include <linux/kernel.h>
	16	#include <linux/errno.h>
1da177e4	17	#include <linux/interrupt.h>
a03010ed	18	#include <linux/irq.h>
1da177e4	19
1da177e4	20	#include <asm/ptrace.h>
1da177e4 LT	21	#include <asm/traps.h>
	22
	23	#include <asm/q40_master.h>
	24	#include <asm/q40ints.h>
	25
	26	/*
	27	* Q40 IRQs are defined as follows:
	28	* 3,4,5,6,7,10,11,14,15 : ISA dev IRQs
	29	* 16-31: reserved
	30	* 32 : keyboard int
	31	* 33 : frame int (50/200 Hz periodic timer)
	32	* 34 : sample int (10/20 KHz periodic timer)
	33	*
	34	*/
	35
77dda339	36	static void q40_irq_handler(unsigned int, struct pt_regs *fp);
e8abf5e7 GU	37	static void q40_irq_enable(struct irq_data *data);
e8abf5e7 GU	38	static void q40_irq_disable(struct irq_data *data);
1da177e4	39
77dda339 RZ	40	unsigned short q40_ablecount[35];
77dda339 RZ	41	unsigned short q40_state[35];
1da177e4	42
e8abf5e7	43	static unsigned int q40_irq_startup(struct irq_data *data)
77dda339	44	{
e8abf5e7 GU	45	unsigned int irq = data->irq;
e8abf5e7 GU	46
77dda339 RZ	47	/* test for ISA ints not implemented by HW */
	48	switch (irq) {
	49	case 1: case 2: case 8: case 9:
	50	case 11: case 12: case 13:
f85e7cdc	51	printk("%s: ISA IRQ %d not implemented by HW\n", __func__, irq);
c288bf25	52	/* FIXME return -ENXIO; */
77dda339 RZ	53	}
	54	return 0;
	55	}
1da177e4	56
e8abf5e7	57	static void q40_irq_shutdown(struct irq_data *data)
77dda339 RZ	58	{
77dda339 RZ	59	}
1da177e4	60
c288bf25	61	static struct irq_chip q40_irq_chip = {
77dda339	62	.name = "q40",
c288bf25 GU	63	.irq_startup = q40_irq_startup,
c288bf25 GU	64	.irq_shutdown = q40_irq_shutdown,
e8abf5e7 GU	65	.irq_enable = q40_irq_enable,
e8abf5e7 GU	66	.irq_disable = q40_irq_disable,
77dda339	67	};
1da177e4 LT	68
	69	/*
	70	* void q40_init_IRQ (void)
	71	*
	72	* Parameters: None
	73	*
	74	* Returns: Nothing
	75	*
	76	* This function is called during kernel startup to initialize
	77	* the q40 IRQ handling routines.
	78	*/
	79
77dda339	80	static int disabled;
1da177e4	81
66a3f820	82	void __init q40_init_IRQ(void)
1da177e4	83	{
edb34725 GU	84	m68k_setup_irq_controller(&q40_irq_chip, handle_simple_irq, 1,
edb34725 GU	85	Q40_IRQ_MAX);
1da177e4 LT	86
1da177e4 LT	87	/* setup handler for ISA ints */
77dda339 RZ	88	m68k_setup_auto_interrupt(q40_irq_handler);
77dda339 RZ	89
e8abf5e7 GU	90	m68k_irq_startup_irq(IRQ_AUTO_2);
e8abf5e7 GU	91	m68k_irq_startup_irq(IRQ_AUTO_4);
1da177e4 LT	92
1da177e4 LT	93	/* now enable some ints.. */
77dda339	94	master_outb(1, EXT_ENABLE_REG); /* ISA IRQ 5-15 */
1da177e4 LT	95
1da177e4 LT	96	/* make sure keyboard IRQ is disabled */
77dda339	97	master_outb(0, KEY_IRQ_ENABLE_REG);
1da177e4 LT	98	}
1da177e4 LT	99
1da177e4 LT	100
	101	/*
	102	* this stuff doesn't really belong here..
77dda339	103	*/
1da177e4 LT	104
	105	int ql_ticks; /* 200Hz ticks since last jiffie */
	106	static int sound_ticks;
	107
	108	#define SVOL 45
	109
	110	void q40_mksound(unsigned int hz, unsigned int ticks)
	111	{
77dda339 RZ	112	/* for now ignore hz, except that hz==0 switches off sound */
	113	/* simply alternate the ampl (128-SVOL)-(128+SVOL)-..-.. at 200Hz */
	114	if (hz == 0) {
	115	if (sound_ticks)
	116	sound_ticks = 1;
	117
	118	*DAC_LEFT = 128;
	119	*DAC_RIGHT = 128;
	120
	121	return;
	122	}
	123	/* sound itself is done in q40_timer_int */
	124	if (sound_ticks == 0)
	125	sound_ticks = 1000; /* pretty long beep */
	126	sound_ticks = ticks << 1;
1da177e4 LT	127	}
1da177e4 LT	128
40220c1a	129	static irq_handler_t q40_timer_routine;
1da177e4	130
2850bc27	131	static irqreturn_t q40_timer_int (int irq, void * dev)
1da177e4	132	{
77dda339 RZ	133	ql_ticks = ql_ticks ? 0 : 1;
	134	if (sound_ticks) {
	135	unsigned char sval=(sound_ticks & 1) ? 128-SVOL : 128+SVOL;
	136	sound_ticks--;
	137	*DAC_LEFT=sval;
	138	*DAC_RIGHT=sval;
	139	}
	140
	141	if (!ql_ticks)
2850bc27	142	q40_timer_routine(irq, dev);
77dda339	143	return IRQ_HANDLED;
1da177e4 LT	144	}
1da177e4 LT	145
40220c1a	146	void q40_sched_init (irq_handler_t timer_routine)
1da177e4	147	{
77dda339	148	int timer_irq;
1da177e4	149
77dda339 RZ	150	q40_timer_routine = timer_routine;
77dda339 RZ	151	timer_irq = Q40_IRQ_FRAME;
1da177e4	152
77dda339	153	if (request_irq(timer_irq, q40_timer_int, 0,
1da177e4	154	"timer", q40_timer_int))
77dda339	155	panic("Couldn't register timer int");
1da177e4	156
77dda339 RZ	157	master_outb(-1, FRAME_CLEAR_REG);
77dda339 RZ	158	master_outb( 1, FRAME_RATE_REG);
1da177e4 LT	159	}
	160
	161
	162	/*
	163	* tables to translate bits into IRQ numbers
	164	* it is a good idea to order the entries by priority
	165	*
	166	*/
	167
	168	struct IRQ_TABLE{ unsigned mask; int irq ;};
	169	#if 0
	170	static struct IRQ_TABLE iirqs[]={
	171	{Q40_IRQ_FRAME_MASK,Q40_IRQ_FRAME},
	172	{Q40_IRQ_KEYB_MASK,Q40_IRQ_KEYBOARD},
	173	{0,0}};
	174	#endif
	175	static struct IRQ_TABLE eirqs[] = {
	176	{ .mask = Q40_IRQ3_MASK, .irq = 3 }, /* ser 1 */
	177	{ .mask = Q40_IRQ4_MASK, .irq = 4 }, /* ser 2 */
	178	{ .mask = Q40_IRQ14_MASK, .irq = 14 }, /* IDE 1 */
	179	{ .mask = Q40_IRQ15_MASK, .irq = 15 }, /* IDE 2 */
	180	{ .mask = Q40_IRQ6_MASK, .irq = 6 }, /* floppy, handled elsewhere */
	181	{ .mask = Q40_IRQ7_MASK, .irq = 7 }, /* par */
	182	{ .mask = Q40_IRQ5_MASK, .irq = 5 },
	183	{ .mask = Q40_IRQ10_MASK, .irq = 10 },
	184	{0,0}
	185	};
	186
	187	/* complain only this many times about spurious ints : */
0c79cf6a	188	static int ccleirq=60; /* ISA dev IRQs*/
1da177e4 LT	189	/static int cclirq=60;/ /* internal */
	190
	191	/* FIXME: add shared ints,mask,unmask,probing.... */
	192
	193	#define IRQ_INPROGRESS 1
	194	/static unsigned short saved_mask;/
	195	//static int do_tint=0;
	196
	197	#define DEBUG_Q40INT
	198	/#define IP_USE_DISABLE //* would be nice, but crashes ???? */
	199
	200	static int mext_disabled=0; /* ext irq disabled by master chip? */
	201	static int aliased_irq=0; /* how many times inside handler ?*/
	202
	203
77dda339 RZ	204	/* got interrupt, dispatch to ISA or keyboard/timer IRQs */
77dda339 RZ	205	static void q40_irq_handler(unsigned int irq, struct pt_regs *fp)
1da177e4	206	{
77dda339 RZ	207	unsigned mir, mer;
77dda339 RZ	208	int i;
1da177e4 LT	209
1da177e4 LT	210	//repeat:
77dda339 RZ	211	mir = master_inb(IIRQ_REG);
	212	#ifdef CONFIG_BLK_DEV_FD
	213	if ((mir & Q40_IRQ_EXT_MASK) &&
	214	(master_inb(EIRQ_REG) & Q40_IRQ6_MASK)) {
	215	floppy_hardint();
	216	return;
	217	}
	218	#endif
	219	switch (irq) {
	220	case 4:
	221	case 6:
1425df87	222	do_IRQ(Q40_IRQ_SAMPLE, fp);
77dda339 RZ	223	return;
	224	}
	225	if (mir & Q40_IRQ_FRAME_MASK) {
1425df87	226	do_IRQ(Q40_IRQ_FRAME, fp);
77dda339 RZ	227	master_outb(-1, FRAME_CLEAR_REG);
	228	}
	229	if ((mir & Q40_IRQ_SER_MASK) \|\| (mir & Q40_IRQ_EXT_MASK)) {
	230	mer = master_inb(EIRQ_REG);
	231	for (i = 0; eirqs[i].mask; i++) {
	232	if (mer & eirqs[i].mask) {
	233	irq = eirqs[i].irq;
1da177e4 LT	234	/*
	235	* There is a little mess wrt which IRQ really caused this irq request. The
	236	* main problem is that IIRQ_REG and EIRQ_REG reflect the state when they
	237	* are read - which is long after the request came in. In theory IRQs should
0c79cf6a	238	* not just go away but they occasionally do
1da177e4	239	*/
77dda339 RZ	240	if (irq > 4 && irq <= 15 && mext_disabled) {
	241	/aliased_irq++;/
	242	goto iirq;
	243	}
	244	if (q40_state[irq] & IRQ_INPROGRESS) {
	245	/* some handlers do local_irq_enable() for irq latency reasons, */
	246	/* however reentering an active irq handler is not permitted */
1da177e4	247	#ifdef IP_USE_DISABLE
77dda339 RZ	248	/* in theory this is the better way to do it because it still */
	249	/* lets through eg the serial irqs, unfortunately it crashes */
	250	disable_irq(irq);
	251	disabled = 1;
1da177e4	252	#else
77dda339 RZ	253	/*printk("IRQ_INPROGRESS detected for irq %d, disabling - %s disabled\n",
	254	irq, disabled ? "already" : "not yet"); */
	255	fp->sr = (((fp->sr) & (~0x700))+0x200);
	256	disabled = 1;
1da177e4	257	#endif
77dda339 RZ	258	goto iirq;
	259	}
	260	q40_state[irq] \|= IRQ_INPROGRESS;
1425df87	261	do_IRQ(irq, fp);
77dda339 RZ	262	q40_state[irq] &= ~IRQ_INPROGRESS;
	263
	264	/* naively enable everything, if that fails than */
	265	/* this function will be reentered immediately thus */
	266	/* getting another chance to disable the IRQ */
	267
	268	if (disabled) {
1da177e4	269	#ifdef IP_USE_DISABLE
77dda339 RZ	270	if (irq > 4) {
	271	disabled = 0;
	272	enable_irq(irq);
	273	}
1da177e4	274	#else
77dda339 RZ	275	disabled = 0;
77dda339 RZ	276	/printk("reenabling irq %d\n", irq); /
1da177e4	277	#endif
77dda339	278	}
1da177e4	279	// used to do 'goto repeat;' here, this delayed bh processing too long
77dda339 RZ	280	return;
	281	}
	282	}
	283	if (mer && ccleirq > 0 && !aliased_irq) {
	284	printk("ISA interrupt from unknown source? EIRQ_REG = %x\n",mer);
	285	ccleirq--;
	286	}
1da177e4	287	}
77dda339 RZ	288	iirq:
	289	mir = master_inb(IIRQ_REG);
	290	/* should test whether keyboard irq is really enabled, doing it in defhand */
	291	if (mir & Q40_IRQ_KEYB_MASK)
1425df87	292	do_IRQ(Q40_IRQ_KEYBOARD, fp);
1da177e4	293
77dda339	294	return;
1da177e4	295	}
1da177e4	296
e8abf5e7	297	void q40_irq_enable(struct irq_data *data)
1da177e4	298	{
e8abf5e7 GU	299	unsigned int irq = data->irq;
e8abf5e7 GU	300
77dda339 RZ	301	if (irq >= 5 && irq <= 15) {
	302	mext_disabled--;
	303	if (mext_disabled > 0)
e8abf5e7	304	printk("q40_irq_enable : nested disable/enable\n");
77dda339 RZ	305	if (mext_disabled == 0)
	306	master_outb(1, EXT_ENABLE_REG);
	307	}
1da177e4 LT	308	}
	309
	310
e8abf5e7	311	void q40_irq_disable(struct irq_data *data)
1da177e4	312	{
e8abf5e7 GU	313	unsigned int irq = data->irq;
e8abf5e7 GU	314
77dda339 RZ	315	/* disable ISA iqs : only do something if the driver has been
	316	* verified to be Q40 "compatible" - right now IDE, NE2K
	317	* Any driver should not attempt to sleep across disable_irq !!
	318	*/
	319
	320	if (irq >= 5 && irq <= 15) {
	321	master_outb(0, EXT_ENABLE_REG);
	322	mext_disabled++;
	323	if (mext_disabled > 1)
	324	printk("disable_irq nesting count %d\n",mext_disabled);
	325	}
1da177e4	326	}