arch/m68k/q40/q40ints.c - third_party/linux - Git at Google

 /*
  * 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 <asm/ptrace.h>
 #include <asm/system.h>
 #include <asm/irq.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_enable_irq(unsigned int);
 static void q40_disable_irq(unsigned int);

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

 static int q40_irq_startup(unsigned int 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", __FUNCTION__, irq);
 		return -ENXIO;
 	}
 	return 0;
 }

 static void q40_irq_shutdown(unsigned int irq)
 {
 }

 static struct irq_controller q40_irq_controller = {
 	.name		= "q40",
 	.lock		= __SPIN_LOCK_UNLOCKED(q40_irq_controller.lock),
 	.startup	= q40_irq_startup,
 	.shutdown	= q40_irq_shutdown,
 	.enable		= q40_enable_irq,
 	.disable	= q40_disable_irq,
 };

 /*
  * 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_controller, 1, Q40_IRQ_MAX);

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

 	m68k_irq_startup(IRQ_AUTO_2);
 	m68k_irq_startup(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:
 		__m68k_handle_int(Q40_IRQ_SAMPLE, fp);
 		return;
 	}
 	if (mir & Q40_IRQ_FRAME_MASK) {
 		__m68k_handle_int(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;
 				__m68k_handle_int(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)
 		__m68k_handle_int(Q40_IRQ_KEYBOARD, fp);

 	return;
 }

 void q40_enable_irq(unsigned int irq)
 {
 	if (irq >= 5 && irq <= 15) {
 		mext_disabled--;
 		if (mext_disabled > 0)
 			printk("q40_enable_irq : nested disable/enable\n");
 		if (mext_disabled == 0)
 			master_outb(1, EXT_ENABLE_REG);
 	}
 }


 void q40_disable_irq(unsigned int 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);
 	}
 }

 unsigned long q40_probe_irq_on(void)
 {
 	printk("irq probing not working - reconfigure the driver to avoid this\n");
 	return -1;
 }
 int q40_probe_irq_off(unsigned long irqs)
 {
 	return -1;
 }
	/*
	* 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 <asm/ptrace.h>
	#include <asm/system.h>
	#include <asm/irq.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_enable_irq(unsigned int);
	static void q40_disable_irq(unsigned int);

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

	static int q40_irq_startup(unsigned int 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", __FUNCTION__, irq);
	return -ENXIO;
	}
	return 0;
	}

	static void q40_irq_shutdown(unsigned int irq)
	{
	}

	static struct irq_controller q40_irq_controller = {
	.name = "q40",
	.lock = __SPIN_LOCK_UNLOCKED(q40_irq_controller.lock),
	.startup = q40_irq_startup,
	.shutdown = q40_irq_shutdown,
	.enable = q40_enable_irq,
	.disable = q40_disable_irq,
	};

	/*
	* 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_controller, 1, Q40_IRQ_MAX);

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

	m68k_irq_startup(IRQ_AUTO_2);
	m68k_irq_startup(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:
	__m68k_handle_int(Q40_IRQ_SAMPLE, fp);
	return;
	}
	if (mir & Q40_IRQ_FRAME_MASK) {
	__m68k_handle_int(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;
	__m68k_handle_int(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)
	__m68k_handle_int(Q40_IRQ_KEYBOARD, fp);

	return;
	}

	void q40_enable_irq(unsigned int irq)
	{
	if (irq >= 5 && irq <= 15) {
	mext_disabled--;
	if (mext_disabled > 0)
	printk("q40_enable_irq : nested disable/enable\n");
	if (mext_disabled == 0)
	master_outb(1, EXT_ENABLE_REG);
	}
	}


	void q40_disable_irq(unsigned int 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);
	}
	}

	unsigned long q40_probe_irq_on(void)
	{
	printk("irq probing not working - reconfigure the driver to avoid this\n");
	return -1;
	}
	int q40_probe_irq_off(unsigned long irqs)
	{
	return -1;
	}