[deliverable/linux.git] / arch / ppc / amiga / amiints.c

/*
 * Amiga Linux interrupt handling code
 *
 * 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.
 *
 * 11/07/96: rewritten interrupt handling, irq lists are exists now only for
 *           this sources where it makes sense (VERTB/PORTS/EXTER) and you must
 *           be careful that dev_id for this sources is unique since this the
 *           only possibility to distinguish between different handlers for
 *           free_irq. irq lists also have different irq flags:
 *           - IRQ_FLG_FAST: handler is inserted at top of list (after other
 *                           fast handlers)
 *           - IRQ_FLG_SLOW: handler is inserted at bottom of list and before
 *                           they're executed irq level is set to the previous
 *                           one, but handlers don't need to be reentrant, if
 *                           reentrance occurred, slow handlers will be just
 *                           called again.
 *           The whole interrupt handling for CIAs is moved to cia.c
 *           /Roman Zippel
 *
 * 07/08/99: rewamp of the interrupt handling - we now have two types of
 *           interrupts, normal and fast handlers, fast handlers being
 *           marked with SA_INTERRUPT and runs with all other interrupts
 *           disabled. Normal interrupts disable their own source but
 *           run with all other interrupt sources enabled.
 *           PORTS and EXTER interrupts are always shared even if the
 *           drivers do not explicitly mark this when calling
 *           request_irq which they really should do.
 *           This is similar to the way interrupts are handled on all
 *           other architectures and makes a ton of sense besides
 *           having the advantage of making it easier to share
 *           drivers.
 *           /Jes
 */

#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel_stat.h>
#include <linux/init.h>

#include <asm/system.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>
#include <asm/amipcmcia.h>

#ifdef CONFIG_APUS
#include <asm/amigappc.h>
#endif

extern void cia_init_IRQ(struct ciabase *base);

unsigned short ami_intena_vals[AMI_STD_IRQS] = {
	IF_VERTB, IF_COPER, IF_AUD0, IF_AUD1, IF_AUD2, IF_AUD3, IF_BLIT,
	IF_DSKSYN, IF_DSKBLK, IF_RBF, IF_TBE, IF_SOFT, IF_PORTS, IF_EXTER
};
static const unsigned char ami_servers[AMI_STD_IRQS] = {
	1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1
};

static short ami_ablecount[AMI_IRQS];

static void ami_badint(int irq, void *dev_id, struct pt_regs *fp)
{
/*	num_spurious += 1;*/
}

/*
 * void amiga_init_IRQ(void)
 *
 * Parameters:	None
 *
 * Returns:	Nothing
 *
 * This function should be called during kernel startup to initialize
 * the amiga IRQ handling routines.
 */

__init
void amiga_init_IRQ(void)
{
	int i;

	for (i = 0; i < AMI_IRQS; i++)
		ami_ablecount[i] = 0;

	/* turn off PCMCIA interrupts */
	if (AMIGAHW_PRESENT(PCMCIA))
		gayle.inten = GAYLE_IRQ_IDE;

	/* turn off all interrupts... */
	amiga_custom.intena = 0x7fff;
	amiga_custom.intreq = 0x7fff;

#ifdef CONFIG_APUS
	/* Clear any inter-CPU interrupt requests. Circumvents bug in
           Blizzard IPL emulation HW (or so it appears). */
	APUS_WRITE(APUS_INT_LVL, INTLVL_SETRESET | INTLVL_MASK);

	/* Init IPL emulation. */
	APUS_WRITE(APUS_REG_INT, REGINT_INTMASTER | REGINT_ENABLEIPL);
	APUS_WRITE(APUS_IPL_EMU, IPLEMU_DISABLEINT);
	APUS_WRITE(APUS_IPL_EMU, IPLEMU_SETRESET | IPLEMU_IPLMASK);
#endif
	/* ... and enable the master interrupt bit */
	amiga_custom.intena = IF_SETCLR | IF_INTEN;

	cia_init_IRQ(&ciaa_base);
	cia_init_IRQ(&ciab_base);
}

/*
 * Enable/disable a particular machine specific interrupt source.
 * Note that this may affect other interrupts in case of a shared interrupt.
 * This function should only be called for a _very_ short time to change some
 * internal data, that may not be changed by the interrupt at the same time.
 * ami_(enable|disable)_irq calls may also be nested.
 */

void amiga_enable_irq(unsigned int irq)
{
	if (irq >= AMI_IRQS) {
		printk("%s: Unknown IRQ %d\n", __FUNCTION__, irq);
		return;
	}

	ami_ablecount[irq]--;
	if (ami_ablecount[irq]<0)
		ami_ablecount[irq]=0;
	else if (ami_ablecount[irq])
		return;

	/* No action for auto-vector interrupts */
	if (irq >= IRQ_AMIGA_AUTO){
		printk("%s: Trying to enable auto-vector IRQ %i\n",
		       __FUNCTION__, irq - IRQ_AMIGA_AUTO);
		return;
	}

	if (irq >= IRQ_AMIGA_CIAA) {
		cia_set_irq(irq, 0);
		cia_able_irq(irq, 1);
		return;
	}

	/* enable the interrupt */
	amiga_custom.intena = IF_SETCLR | ami_intena_vals[irq];
}

void amiga_disable_irq(unsigned int irq)
{
	if (irq >= AMI_IRQS) {
		printk("%s: Unknown IRQ %d\n", __FUNCTION__, irq);
		return;
	}

	if (ami_ablecount[irq]++)
		return;

	/* No action for auto-vector interrupts */
	if (irq >= IRQ_AMIGA_AUTO) {
		printk("%s: Trying to disable auto-vector IRQ %i\n",
		       __FUNCTION__, irq - IRQ_AMIGA_AUTO);
		return;
	}

	if (irq >= IRQ_AMIGA_CIAA) {
		cia_able_irq(irq, 0);
		return;
	}

	/* disable the interrupt */
	amiga_custom.intena = ami_intena_vals[irq];
}

inline void amiga_do_irq(int irq, struct pt_regs *fp)
{
	irq_desc_t *desc = irq_desc + irq;
	struct irqaction *action = desc->action;

	kstat_cpu(0).irqs[irq]++;
	action->handler(irq, action->dev_id, fp);
}

void amiga_do_irq_list(int irq, struct pt_regs *fp)
{
	irq_desc_t *desc = irq_desc + irq;
	struct irqaction *action;

	kstat_cpu(0).irqs[irq]++;

	amiga_custom.intreq = ami_intena_vals[irq];

	for (action = desc->action; action; action = action->next)
		action->handler(irq, action->dev_id, fp);
}

/*
 * The builtin Amiga hardware interrupt handlers.
 */

static void ami_int1(int irq, void *dev_id, struct pt_regs *fp)
{
	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;

	/* if serial transmit buffer empty, interrupt */
	if (ints & IF_TBE) {
		amiga_custom.intreq = IF_TBE;
		amiga_do_irq(IRQ_AMIGA_TBE, fp);
	}

	/* if floppy disk transfer complete, interrupt */
	if (ints & IF_DSKBLK) {
		amiga_custom.intreq = IF_DSKBLK;
		amiga_do_irq(IRQ_AMIGA_DSKBLK, fp);
	}

	/* if software interrupt set, interrupt */
	if (ints & IF_SOFT) {
		amiga_custom.intreq = IF_SOFT;
		amiga_do_irq(IRQ_AMIGA_SOFT, fp);
	}
}

static void ami_int3(int irq, void *dev_id, struct pt_regs *fp)
{
	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;

	/* if a blitter interrupt */
	if (ints & IF_BLIT) {
		amiga_custom.intreq = IF_BLIT;
		amiga_do_irq(IRQ_AMIGA_BLIT, fp);
	}

	/* if a copper interrupt */
	if (ints & IF_COPER) {
		amiga_custom.intreq = IF_COPER;
		amiga_do_irq(IRQ_AMIGA_COPPER, fp);
	}

	/* if a vertical blank interrupt */
	if (ints & IF_VERTB)
		amiga_do_irq_list(IRQ_AMIGA_VERTB, fp);
}

static void ami_int4(int irq, void *dev_id, struct pt_regs *fp)
{
	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;

	/* if audio 0 interrupt */
	if (ints & IF_AUD0) {
		amiga_custom.intreq = IF_AUD0;
		amiga_do_irq(IRQ_AMIGA_AUD0, fp);
	}

	/* if audio 1 interrupt */
	if (ints & IF_AUD1) {
		amiga_custom.intreq = IF_AUD1;
		amiga_do_irq(IRQ_AMIGA_AUD1, fp);
	}

	/* if audio 2 interrupt */
	if (ints & IF_AUD2) {
		amiga_custom.intreq = IF_AUD2;
		amiga_do_irq(IRQ_AMIGA_AUD2, fp);
	}

	/* if audio 3 interrupt */
	if (ints & IF_AUD3) {
		amiga_custom.intreq = IF_AUD3;
		amiga_do_irq(IRQ_AMIGA_AUD3, fp);
	}
}

static void ami_int5(int irq, void *dev_id, struct pt_regs *fp)
{
	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;

	/* if serial receive buffer full interrupt */
	if (ints & IF_RBF) {
		/* acknowledge of IF_RBF must be done by the serial interrupt */
		amiga_do_irq(IRQ_AMIGA_RBF, fp);
	}

	/* if a disk sync interrupt */
	if (ints & IF_DSKSYN) {
		amiga_custom.intreq = IF_DSKSYN;
		amiga_do_irq(IRQ_AMIGA_DSKSYN, fp);
	}
}

static void ami_int7(int irq, void *dev_id, struct pt_regs *fp)
{
	panic ("level 7 interrupt received\n");
}

#ifdef CONFIG_APUS
/* The PPC irq handling links all handlers requested on the same vector
   and executes them in a loop. Having ami_badint at the end of the chain
   is a bad idea. */
struct irqaction amiga_sys_irqaction[AUTO_IRQS] = {
	{ .handler = ami_badint, .name = "spurious int" },
	{ .handler = ami_int1, .name = "int1 handler" },
	{ 0, /* CIAA */ },
	{ .handler = ami_int3, .name = "int3 handler" },
	{ .handler = ami_int4, .name = "int4 handler" },
	{ .handler = ami_int5, .name = "int5 handler" },
	{ 0, /* CIAB */ },
	{ .handler = ami_int7, .name = "int7 handler" },
};
#else
void (*amiga_default_handler[SYS_IRQS])(int, void *, struct pt_regs *) = {
	ami_badint, ami_int1, ami_badint, ami_int3,
	ami_int4, ami_int5, ami_badint, ami_int7
};
#endif
Commit	Line	Data
1da177e4	1	/*
2ef9481e	2	* Amiga Linux interrupt handling code
1da177e4 LT	3	*
	4	* This file is subject to the terms and conditions of the GNU General Public
	5	* License. See the file COPYING in the main directory of this archive
	6	* for more details.
	7	*
	8	* 11/07/96: rewritten interrupt handling, irq lists are exists now only for
	9	* this sources where it makes sense (VERTB/PORTS/EXTER) and you must
	10	* be careful that dev_id for this sources is unique since this the
	11	* only possibility to distinguish between different handlers for
	12	* free_irq. irq lists also have different irq flags:
	13	* - IRQ_FLG_FAST: handler is inserted at top of list (after other
	14	* fast handlers)
	15	* - IRQ_FLG_SLOW: handler is inserted at bottom of list and before
	16	* they're executed irq level is set to the previous
	17	* one, but handlers don't need to be reentrant, if
	18	* reentrance occurred, slow handlers will be just
	19	* called again.
	20	* The whole interrupt handling for CIAs is moved to cia.c
	21	* /Roman Zippel
	22	*
	23	* 07/08/99: rewamp of the interrupt handling - we now have two types of
	24	* interrupts, normal and fast handlers, fast handlers being
	25	* marked with SA_INTERRUPT and runs with all other interrupts
	26	* disabled. Normal interrupts disable their own source but
	27	* run with all other interrupt sources enabled.
	28	* PORTS and EXTER interrupts are always shared even if the
	29	* drivers do not explicitly mark this when calling
	30	* request_irq which they really should do.
	31	* This is similar to the way interrupts are handled on all
	32	* other architectures and makes a ton of sense besides
	33	* having the advantage of making it easier to share
	34	* drivers.
	35	* /Jes
	36	*/
	37
	38	#include <linux/config.h>
	39	#include <linux/types.h>
	40	#include <linux/kernel.h>
	41	#include <linux/sched.h>
	42	#include <linux/interrupt.h>
	43	#include <linux/irq.h>
	44	#include <linux/kernel_stat.h>
	45	#include <linux/init.h>
	46
	47	#include <asm/system.h>
	48	#include <asm/irq.h>
	49	#include <asm/traps.h>
	50	#include <asm/amigahw.h>
	51	#include <asm/amigaints.h>
	52	#include <asm/amipcmcia.h>
	53
	54	#ifdef CONFIG_APUS
	55	#include <asm/amigappc.h>
	56	#endif
	57
	58	extern void cia_init_IRQ(struct ciabase *base);
	59
	60	unsigned short ami_intena_vals[AMI_STD_IRQS] = {
	61	IF_VERTB, IF_COPER, IF_AUD0, IF_AUD1, IF_AUD2, IF_AUD3, IF_BLIT,
	62	IF_DSKSYN, IF_DSKBLK, IF_RBF, IF_TBE, IF_SOFT, IF_PORTS, IF_EXTER
	63	};
	64	static const unsigned char ami_servers[AMI_STD_IRQS] = {
	65	1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1
	66	};
67
68	static short ami_ablecount[AMI_IRQS];
69
70	static void ami_badint(int irq, void dev_id, struct pt_regs fp)
71	{
72	/* num_spurious += 1;*/
73	}
74
75	/*
76	* void amiga_init_IRQ(void)
77	*
78	* Parameters: None
79	*
80	* Returns: Nothing
81	*
82	* This function should be called during kernel startup to initialize
83	* the amiga IRQ handling routines.
84	*/
85
86	__init
87	void amiga_init_IRQ(void)
88	{
89	int i;
90
91	for (i = 0; i < AMI_IRQS; i++)
92	ami_ablecount[i] = 0;
93
94	/* turn off PCMCIA interrupts */
95	if (AMIGAHW_PRESENT(PCMCIA))
96	gayle.inten = GAYLE_IRQ_IDE;
97
98	/* turn off all interrupts... */
b4290a23 AV	99	amiga_custom.intena = 0x7fff;
b4290a23 AV	100	amiga_custom.intreq = 0x7fff;
1da177e4 LT	101
	102	#ifdef CONFIG_APUS
	103	/* Clear any inter-CPU interrupt requests. Circumvents bug in
	104	Blizzard IPL emulation HW (or so it appears). */
	105	APUS_WRITE(APUS_INT_LVL, INTLVL_SETRESET \| INTLVL_MASK);
	106
	107	/* Init IPL emulation. */
	108	APUS_WRITE(APUS_REG_INT, REGINT_INTMASTER \| REGINT_ENABLEIPL);
	109	APUS_WRITE(APUS_IPL_EMU, IPLEMU_DISABLEINT);
	110	APUS_WRITE(APUS_IPL_EMU, IPLEMU_SETRESET \| IPLEMU_IPLMASK);
	111	#endif
	112	/* ... and enable the master interrupt bit */
b4290a23	113	amiga_custom.intena = IF_SETCLR \| IF_INTEN;
1da177e4 LT	114
	115	cia_init_IRQ(&ciaa_base);
	116	cia_init_IRQ(&ciab_base);
	117	}
	118
	119	/*
	120	* Enable/disable a particular machine specific interrupt source.
	121	* Note that this may affect other interrupts in case of a shared interrupt.
	122	* This function should only be called for a _very_ short time to change some
	123	* internal data, that may not be changed by the interrupt at the same time.
	124	* ami_(enable\|disable)_irq calls may also be nested.
	125	*/
	126
	127	void amiga_enable_irq(unsigned int irq)
	128	{
	129	if (irq >= AMI_IRQS) {
	130	printk("%s: Unknown IRQ %d\n", __FUNCTION__, irq);
	131	return;
	132	}
	133
	134	ami_ablecount[irq]--;
	135	if (ami_ablecount[irq]<0)
	136	ami_ablecount[irq]=0;
	137	else if (ami_ablecount[irq])
	138	return;
	139
	140	/* No action for auto-vector interrupts */
	141	if (irq >= IRQ_AMIGA_AUTO){
	142	printk("%s: Trying to enable auto-vector IRQ %i\n",
	143	__FUNCTION__, irq - IRQ_AMIGA_AUTO);
	144	return;
	145	}
	146
	147	if (irq >= IRQ_AMIGA_CIAA) {
	148	cia_set_irq(irq, 0);
	149	cia_able_irq(irq, 1);
	150	return;
	151	}
	152
	153	/* enable the interrupt */
b4290a23	154	amiga_custom.intena = IF_SETCLR \| ami_intena_vals[irq];
1da177e4 LT	155	}
	156
	157	void amiga_disable_irq(unsigned int irq)
	158	{
	159	if (irq >= AMI_IRQS) {
	160	printk("%s: Unknown IRQ %d\n", __FUNCTION__, irq);
	161	return;
	162	}
	163
	164	if (ami_ablecount[irq]++)
	165	return;
	166
	167	/* No action for auto-vector interrupts */
	168	if (irq >= IRQ_AMIGA_AUTO) {
	169	printk("%s: Trying to disable auto-vector IRQ %i\n",
	170	__FUNCTION__, irq - IRQ_AMIGA_AUTO);
	171	return;
	172	}
	173
	174	if (irq >= IRQ_AMIGA_CIAA) {
	175	cia_able_irq(irq, 0);
	176	return;
	177	}
	178
	179	/* disable the interrupt */
b4290a23	180	amiga_custom.intena = ami_intena_vals[irq];
1da177e4 LT	181	}
	182
	183	inline void amiga_do_irq(int irq, struct pt_regs *fp)
	184	{
	185	irq_desc_t *desc = irq_desc + irq;
	186	struct irqaction *action = desc->action;
	187
	188	kstat_cpu(0).irqs[irq]++;
	189	action->handler(irq, action->dev_id, fp);
	190	}
	191
	192	void amiga_do_irq_list(int irq, struct pt_regs *fp)
	193	{
	194	irq_desc_t *desc = irq_desc + irq;
	195	struct irqaction *action;
	196
	197	kstat_cpu(0).irqs[irq]++;
	198
b4290a23	199	amiga_custom.intreq = ami_intena_vals[irq];
1da177e4 LT	200
	201	for (action = desc->action; action; action = action->next)
	202	action->handler(irq, action->dev_id, fp);
	203	}
	204
	205	/*
	206	* The builtin Amiga hardware interrupt handlers.
	207	*/
	208
	209	static void ami_int1(int irq, void dev_id, struct pt_regs fp)
	210	{
b4290a23	211	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
1da177e4 LT	212
	213	/* if serial transmit buffer empty, interrupt */
	214	if (ints & IF_TBE) {
b4290a23	215	amiga_custom.intreq = IF_TBE;
1da177e4 LT	216	amiga_do_irq(IRQ_AMIGA_TBE, fp);
	217	}
	218
	219	/* if floppy disk transfer complete, interrupt */
	220	if (ints & IF_DSKBLK) {
b4290a23	221	amiga_custom.intreq = IF_DSKBLK;
1da177e4 LT	222	amiga_do_irq(IRQ_AMIGA_DSKBLK, fp);
	223	}
	224
	225	/* if software interrupt set, interrupt */
	226	if (ints & IF_SOFT) {
b4290a23	227	amiga_custom.intreq = IF_SOFT;
1da177e4 LT	228	amiga_do_irq(IRQ_AMIGA_SOFT, fp);
	229	}
	230	}
	231
	232	static void ami_int3(int irq, void dev_id, struct pt_regs fp)
	233	{
b4290a23	234	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
1da177e4 LT	235
	236	/* if a blitter interrupt */
	237	if (ints & IF_BLIT) {
b4290a23	238	amiga_custom.intreq = IF_BLIT;
1da177e4 LT	239	amiga_do_irq(IRQ_AMIGA_BLIT, fp);
	240	}
	241
	242	/* if a copper interrupt */
	243	if (ints & IF_COPER) {
b4290a23	244	amiga_custom.intreq = IF_COPER;
1da177e4 LT	245	amiga_do_irq(IRQ_AMIGA_COPPER, fp);
	246	}
	247
	248	/* if a vertical blank interrupt */
	249	if (ints & IF_VERTB)
	250	amiga_do_irq_list(IRQ_AMIGA_VERTB, fp);
	251	}
	252
	253	static void ami_int4(int irq, void dev_id, struct pt_regs fp)
	254	{
b4290a23	255	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
1da177e4 LT	256
	257	/* if audio 0 interrupt */
	258	if (ints & IF_AUD0) {
b4290a23	259	amiga_custom.intreq = IF_AUD0;
1da177e4 LT	260	amiga_do_irq(IRQ_AMIGA_AUD0, fp);
	261	}
	262
	263	/* if audio 1 interrupt */
	264	if (ints & IF_AUD1) {
b4290a23	265	amiga_custom.intreq = IF_AUD1;
1da177e4 LT	266	amiga_do_irq(IRQ_AMIGA_AUD1, fp);
	267	}
	268
	269	/* if audio 2 interrupt */
	270	if (ints & IF_AUD2) {
b4290a23	271	amiga_custom.intreq = IF_AUD2;
1da177e4 LT	272	amiga_do_irq(IRQ_AMIGA_AUD2, fp);
	273	}
	274
	275	/* if audio 3 interrupt */
	276	if (ints & IF_AUD3) {
b4290a23	277	amiga_custom.intreq = IF_AUD3;
1da177e4 LT	278	amiga_do_irq(IRQ_AMIGA_AUD3, fp);
	279	}
	280	}
	281
	282	static void ami_int5(int irq, void dev_id, struct pt_regs fp)
	283	{
b4290a23	284	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
1da177e4 LT	285
	286	/* if serial receive buffer full interrupt */
	287	if (ints & IF_RBF) {
	288	/* acknowledge of IF_RBF must be done by the serial interrupt */
	289	amiga_do_irq(IRQ_AMIGA_RBF, fp);
	290	}
	291
	292	/* if a disk sync interrupt */
	293	if (ints & IF_DSKSYN) {
b4290a23	294	amiga_custom.intreq = IF_DSKSYN;
1da177e4 LT	295	amiga_do_irq(IRQ_AMIGA_DSKSYN, fp);
	296	}
	297	}
	298
	299	static void ami_int7(int irq, void dev_id, struct pt_regs fp)
	300	{
	301	panic ("level 7 interrupt received\n");
	302	}
	303
	304	#ifdef CONFIG_APUS
	305	/* The PPC irq handling links all handlers requested on the same vector
	306	and executes them in a loop. Having ami_badint at the end of the chain
	307	is a bad idea. */
	308	struct irqaction amiga_sys_irqaction[AUTO_IRQS] = {
	309	{ .handler = ami_badint, .name = "spurious int" },
	310	{ .handler = ami_int1, .name = "int1 handler" },
	311	{ 0, /* CIAA */ },
	312	{ .handler = ami_int3, .name = "int3 handler" },
	313	{ .handler = ami_int4, .name = "int4 handler" },
	314	{ .handler = ami_int5, .name = "int5 handler" },
	315	{ 0, /* CIAB */ },
	316	{ .handler = ami_int7, .name = "int7 handler" },
	317	};
	318	#else
	319	void (amiga_default_handler[SYS_IRQS])(int, void , struct pt_regs *) = {
	320	ami_badint, ami_int1, ami_badint, ami_int3,
	321	ami_int4, ami_int5, ami_badint, ami_int7
	322	};
	323	#endif