[mirror_ubuntu-artful-kernel.git] / arch / m68k / mac / oss.c

/*
 *	OSS handling
 *	Written by Joshua M. Thompson (funaho@jurai.org)
 *
 *
 *	This chip is used in the IIfx in place of VIA #2. It acts like a fancy
 *	VIA chip with prorammable interrupt levels.
 *
 * 990502 (jmt) - Major rewrite for new interrupt architecture as well as some
 *		  recent insights into OSS operational details.
 * 990610 (jmt) - Now taking full advantage of the OSS. Interrupts are mapped
 *		  to mostly match the A/UX interrupt scheme supported on the
 *		  VIA side. Also added support for enabling the ISM irq again
 *		  since we now have a functional IOP manager.
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/init.h>
#ifdef CONFIG_GENERIC_HARDIRQS
#include <linux/irq.h>
#endif

#include <asm/bootinfo.h>
#include <asm/macintosh.h>
#include <asm/macints.h>
#include <asm/mac_via.h>
#include <asm/mac_oss.h>

int oss_present;
volatile struct mac_oss *oss;

static irqreturn_t oss_irq(int, void *);
static irqreturn_t oss_nubus_irq(int, void *);

extern irqreturn_t via1_irq(int, void *);

/*
 * Initialize the OSS
 *
 * The OSS "detection" code is actually in via_init() which is always called
 * before us. Thus we can count on oss_present being valid on entry.
 */

void __init oss_init(void)
{
	int i;

	if (!oss_present) return;

	oss = (struct mac_oss *) OSS_BASE;

	/* Disable all interrupts. Unlike a VIA it looks like we    */
	/* do this by setting the source's interrupt level to zero. */

	for (i = 0; i <= OSS_NUM_SOURCES; i++) {
		oss->irq_level[i] = OSS_IRQLEV_DISABLED;
	}
	/* If we disable VIA1 here, we never really handle it... */
	oss->irq_level[OSS_VIA1] = OSS_IRQLEV_VIA1;
}

/*
 * Register the OSS and NuBus interrupt dispatchers.
 */

void __init oss_register_interrupts(void)
{
	if (request_irq(OSS_IRQLEV_SCSI, oss_irq, 0, "scsi", (void *)oss))
		pr_err("Couldn't register %s interrupt\n", "scsi");
	if (request_irq(OSS_IRQLEV_NUBUS, oss_nubus_irq, 0, "nubus",
			(void *)oss))
		pr_err("Couldn't register %s interrupt\n", "nubus");
	if (request_irq(OSS_IRQLEV_SOUND, oss_irq, 0, "sound", (void *)oss))
		pr_err("Couldn't register %s interrupt\n", "sound");
	if (request_irq(OSS_IRQLEV_VIA1, via1_irq, 0, "via1", (void *)via1))
		pr_err("Couldn't register %s interrupt\n", "via1");
}

/*
 * Initialize OSS for Nubus access
 */

void __init oss_nubus_init(void)
{
}

/*
 * Handle miscellaneous OSS interrupts. Right now that's just sound
 * and SCSI; everything else is routed to its own autovector IRQ.
 */

static irqreturn_t oss_irq(int irq, void *dev_id)
{
	int events;

	events = oss->irq_pending & (OSS_IP_SOUND|OSS_IP_SCSI);
	if (!events)
		return IRQ_NONE;

#ifdef DEBUG_IRQS
	if ((console_loglevel == 10) && !(events & OSS_IP_SCSI)) {
		printk("oss_irq: irq %d events = 0x%04X\n", irq,
			(int) oss->irq_pending);
	}
#endif
	/* FIXME: how do you clear a pending IRQ?    */

	if (events & OSS_IP_SOUND) {
		oss->irq_pending &= ~OSS_IP_SOUND;
		/* FIXME: call sound handler */
	} else if (events & OSS_IP_SCSI) {
		oss->irq_pending &= ~OSS_IP_SCSI;
		generic_handle_irq(IRQ_MAC_SCSI);
	} else {
		/* FIXME: error check here? */
	}
	return IRQ_HANDLED;
}

/*
 * Nubus IRQ handler, OSS style
 *
 * Unlike the VIA/RBV this is on its own autovector interrupt level.
 */

static irqreturn_t oss_nubus_irq(int irq, void *dev_id)
{
	int events, irq_bit, i;

	events = oss->irq_pending & OSS_IP_NUBUS;
	if (!events)
		return IRQ_NONE;

#ifdef DEBUG_NUBUS_INT
	if (console_loglevel > 7) {
		printk("oss_nubus_irq: events = 0x%04X\n", events);
	}
#endif
	/* There are only six slots on the OSS, not seven */

	i = 6;
	irq_bit = 0x40;
	do {
		--i;
		irq_bit >>= 1;
		if (events & irq_bit) {
			oss->irq_pending &= ~irq_bit;
			generic_handle_irq(NUBUS_SOURCE_BASE + i);
		}
	} while(events & (irq_bit - 1));
	return IRQ_HANDLED;
}

/*
 * Enable an OSS interrupt
 *
 * It looks messy but it's rather straightforward. The switch() statement
 * just maps the machspec interrupt numbers to the right OSS interrupt
 * source (if the OSS handles that interrupt) and then sets the interrupt
 * level for that source to nonzero, thus enabling the interrupt.
 */

void oss_irq_enable(int irq) {
#ifdef DEBUG_IRQUSE
	printk("oss_irq_enable(%d)\n", irq);
#endif
	switch(irq) {
		case IRQ_MAC_SCC:
			oss->irq_level[OSS_IOPSCC] = OSS_IRQLEV_IOPSCC;
			break;
		case IRQ_MAC_ADB:
			oss->irq_level[OSS_IOPISM] = OSS_IRQLEV_IOPISM;
			break;
		case IRQ_MAC_SCSI:
			oss->irq_level[OSS_SCSI] = OSS_IRQLEV_SCSI;
			break;
		case IRQ_NUBUS_9:
		case IRQ_NUBUS_A:
		case IRQ_NUBUS_B:
		case IRQ_NUBUS_C:
		case IRQ_NUBUS_D:
		case IRQ_NUBUS_E:
			irq -= NUBUS_SOURCE_BASE;
			oss->irq_level[irq] = OSS_IRQLEV_NUBUS;
			break;
#ifdef DEBUG_IRQUSE
		default:
			printk("%s unknown irq %d\n", __func__, irq);
			break;
#endif
	}
}

/*
 * Disable an OSS interrupt
 *
 * Same as above except we set the source's interrupt level to zero,
 * to disable the interrupt.
 */

void oss_irq_disable(int irq) {
#ifdef DEBUG_IRQUSE
	printk("oss_irq_disable(%d)\n", irq);
#endif
	switch(irq) {
		case IRQ_MAC_SCC:
			oss->irq_level[OSS_IOPSCC] = OSS_IRQLEV_DISABLED;
			break;
		case IRQ_MAC_ADB:
			oss->irq_level[OSS_IOPISM] = OSS_IRQLEV_DISABLED;
			break;
		case IRQ_MAC_SCSI:
			oss->irq_level[OSS_SCSI] = OSS_IRQLEV_DISABLED;
			break;
		case IRQ_NUBUS_9:
		case IRQ_NUBUS_A:
		case IRQ_NUBUS_B:
		case IRQ_NUBUS_C:
		case IRQ_NUBUS_D:
		case IRQ_NUBUS_E:
			irq -= NUBUS_SOURCE_BASE;
			oss->irq_level[irq] = OSS_IRQLEV_DISABLED;
			break;
#ifdef DEBUG_IRQUSE
		default:
			printk("%s unknown irq %d\n", __func__, irq);
			break;
#endif
	}
}

/*
 * Clear an OSS interrupt
 *
 * Not sure if this works or not but it's the only method I could
 * think of based on the contents of the mac_oss structure.
 */

void oss_irq_clear(int irq) {
	/* FIXME: how to do this on OSS? */
	switch(irq) {
		case IRQ_MAC_SCC:
			oss->irq_pending &= ~OSS_IP_IOPSCC;
			break;
		case IRQ_MAC_ADB:
			oss->irq_pending &= ~OSS_IP_IOPISM;
			break;
		case IRQ_MAC_SCSI:
			oss->irq_pending &= ~OSS_IP_SCSI;
			break;
		case IRQ_NUBUS_9:
		case IRQ_NUBUS_A:
		case IRQ_NUBUS_B:
		case IRQ_NUBUS_C:
		case IRQ_NUBUS_D:
		case IRQ_NUBUS_E:
			irq -= NUBUS_SOURCE_BASE;
			oss->irq_pending &= ~(1 << irq);
			break;
	}
}

/*
 * Check to see if a specific OSS interrupt is pending
 */

int oss_irq_pending(int irq)
{
	switch(irq) {
		case IRQ_MAC_SCC:
			return oss->irq_pending & OSS_IP_IOPSCC;
			break;
		case IRQ_MAC_ADB:
			return oss->irq_pending & OSS_IP_IOPISM;
			break;
		case IRQ_MAC_SCSI:
			return oss->irq_pending & OSS_IP_SCSI;
			break;
		case IRQ_NUBUS_9:
		case IRQ_NUBUS_A:
		case IRQ_NUBUS_B:
		case IRQ_NUBUS_C:
		case IRQ_NUBUS_D:
		case IRQ_NUBUS_E:
			irq -= NUBUS_SOURCE_BASE;
			return oss->irq_pending & (1 << irq);
			break;
	}
	return 0;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* OSS handling
	3	* Written by Joshua M. Thompson (funaho@jurai.org)
	4	*
	5	*
	6	* This chip is used in the IIfx in place of VIA #2. It acts like a fancy
	7	* VIA chip with prorammable interrupt levels.
	8	*
	9	* 990502 (jmt) - Major rewrite for new interrupt architecture as well as some
	10	* recent insights into OSS operational details.
0c79cf6a	11	* 990610 (jmt) - Now taking full advantage of the OSS. Interrupts are mapped
1da177e4 LT	12	* to mostly match the A/UX interrupt scheme supported on the
	13	* VIA side. Also added support for enabling the ISM irq again
	14	* since we now have a functional IOP manager.
	15	*/
	16
	17	#include <linux/types.h>
	18	#include <linux/kernel.h>
	19	#include <linux/mm.h>
	20	#include <linux/delay.h>
	21	#include <linux/init.h>
ddc7fd25 GU	22	#ifdef CONFIG_GENERIC_HARDIRQS
	23	#include <linux/irq.h>
	24	#endif
1da177e4 LT	25
1da177e4 LT	26	#include <asm/bootinfo.h>
1da177e4 LT	27	#include <asm/macintosh.h>
	28	#include <asm/macints.h>
	29	#include <asm/mac_via.h>
	30	#include <asm/mac_oss.h>
	31
	32	int oss_present;
	33	volatile struct mac_oss *oss;
	34
8dfbdf4a AB	35	static irqreturn_t oss_irq(int, void *);
8dfbdf4a AB	36	static irqreturn_t oss_nubus_irq(int, void *);
1da177e4	37
2850bc27	38	extern irqreturn_t via1_irq(int, void *);
1da177e4 LT	39
	40	/*
	41	* Initialize the OSS
	42	*
	43	* The OSS "detection" code is actually in via_init() which is always called
	44	* before us. Thus we can count on oss_present being valid on entry.
	45	*/
	46
	47	void __init oss_init(void)
	48	{
	49	int i;
	50
	51	if (!oss_present) return;
	52
	53	oss = (struct mac_oss *) OSS_BASE;
	54
	55	/* Disable all interrupts. Unlike a VIA it looks like we */
	56	/* do this by setting the source's interrupt level to zero. */
	57
	58	for (i = 0; i <= OSS_NUM_SOURCES; i++) {
	59	oss->irq_level[i] = OSS_IRQLEV_DISABLED;
	60	}
	61	/* If we disable VIA1 here, we never really handle it... */
	62	oss->irq_level[OSS_VIA1] = OSS_IRQLEV_VIA1;
	63	}
	64
	65	/*
	66	* Register the OSS and NuBus interrupt dispatchers.
	67	*/
	68
	69	void __init oss_register_interrupts(void)
	70	{
5a239453	71	if (request_irq(OSS_IRQLEV_SCSI, oss_irq, 0, "scsi", (void *)oss))
92c3dd15	72	pr_err("Couldn't register %s interrupt\n", "scsi");
5a239453 GU	73	if (request_irq(OSS_IRQLEV_NUBUS, oss_nubus_irq, 0, "nubus",
5a239453 GU	74	(void *)oss))
92c3dd15	75	pr_err("Couldn't register %s interrupt\n", "nubus");
5a239453	76	if (request_irq(OSS_IRQLEV_SOUND, oss_irq, 0, "sound", (void *)oss))
92c3dd15	77	pr_err("Couldn't register %s interrupt\n", "sound");
5a239453	78	if (request_irq(OSS_IRQLEV_VIA1, via1_irq, 0, "via1", (void *)via1))
92c3dd15	79	pr_err("Couldn't register %s interrupt\n", "via1");
1da177e4 LT	80	}
	81
	82	/*
	83	* Initialize OSS for Nubus access
	84	*/
	85
	86	void __init oss_nubus_init(void)
	87	{
	88	}
	89
	90	/*
	91	* Handle miscellaneous OSS interrupts. Right now that's just sound
	92	* and SCSI; everything else is routed to its own autovector IRQ.
	93	*/
	94
8dfbdf4a	95	static irqreturn_t oss_irq(int irq, void *dev_id)
1da177e4 LT	96	{
	97	int events;
	98
	99	events = oss->irq_pending & (OSS_IP_SOUND\|OSS_IP_SCSI);
	100	if (!events)
	101	return IRQ_NONE;
	102
	103	#ifdef DEBUG_IRQS
	104	if ((console_loglevel == 10) && !(events & OSS_IP_SCSI)) {
	105	printk("oss_irq: irq %d events = 0x%04X\n", irq,
	106	(int) oss->irq_pending);
	107	}
	108	#endif
	109	/* FIXME: how do you clear a pending IRQ? */
	110
	111	if (events & OSS_IP_SOUND) {
1da177e4	112	oss->irq_pending &= ~OSS_IP_SOUND;
647b804c	113	/* FIXME: call sound handler */
1da177e4	114	} else if (events & OSS_IP_SCSI) {
1da177e4	115	oss->irq_pending &= ~OSS_IP_SCSI;
1425df87	116	generic_handle_irq(IRQ_MAC_SCSI);
1da177e4 LT	117	} else {
	118	/* FIXME: error check here? */
	119	}
	120	return IRQ_HANDLED;
	121	}
	122
	123	/*
	124	* Nubus IRQ handler, OSS style
	125	*
	126	* Unlike the VIA/RBV this is on its own autovector interrupt level.
	127	*/
	128
8dfbdf4a	129	static irqreturn_t oss_nubus_irq(int irq, void *dev_id)
1da177e4 LT	130	{
	131	int events, irq_bit, i;
	132
	133	events = oss->irq_pending & OSS_IP_NUBUS;
	134	if (!events)
	135	return IRQ_NONE;
	136
	137	#ifdef DEBUG_NUBUS_INT
	138	if (console_loglevel > 7) {
	139	printk("oss_nubus_irq: events = 0x%04X\n", events);
	140	}
	141	#endif
	142	/* There are only six slots on the OSS, not seven */
	143
67dfb153 FT	144	i = 6;
	145	irq_bit = 0x40;
	146	do {
	147	--i;
	148	irq_bit >>= 1;
1da177e4	149	if (events & irq_bit) {
1da177e4	150	oss->irq_pending &= ~irq_bit;
1425df87	151	generic_handle_irq(NUBUS_SOURCE_BASE + i);
1da177e4	152	}
67dfb153	153	} while(events & (irq_bit - 1));
1da177e4 LT	154	return IRQ_HANDLED;
	155	}
	156
	157	/*
	158	* Enable an OSS interrupt
	159	*
	160	* It looks messy but it's rather straightforward. The switch() statement
	161	* just maps the machspec interrupt numbers to the right OSS interrupt
	162	* source (if the OSS handles that interrupt) and then sets the interrupt
	163	* level for that source to nonzero, thus enabling the interrupt.
	164	*/
	165
	166	void oss_irq_enable(int irq) {
	167	#ifdef DEBUG_IRQUSE
	168	printk("oss_irq_enable(%d)\n", irq);
	169	#endif
	170	switch(irq) {
80614e5a	171	case IRQ_MAC_SCC:
1da177e4 LT	172	oss->irq_level[OSS_IOPSCC] = OSS_IRQLEV_IOPSCC;
	173	break;
	174	case IRQ_MAC_ADB:
	175	oss->irq_level[OSS_IOPISM] = OSS_IRQLEV_IOPISM;
	176	break;
	177	case IRQ_MAC_SCSI:
	178	oss->irq_level[OSS_SCSI] = OSS_IRQLEV_SCSI;
	179	break;
	180	case IRQ_NUBUS_9:
	181	case IRQ_NUBUS_A:
	182	case IRQ_NUBUS_B:
	183	case IRQ_NUBUS_C:
	184	case IRQ_NUBUS_D:
	185	case IRQ_NUBUS_E:
	186	irq -= NUBUS_SOURCE_BASE;
	187	oss->irq_level[irq] = OSS_IRQLEV_NUBUS;
	188	break;
	189	#ifdef DEBUG_IRQUSE
	190	default:
f85e7cdc	191	printk("%s unknown irq %d\n", __func__, irq);
1da177e4 LT	192	break;
	193	#endif
	194	}
	195	}
	196
	197	/*
	198	* Disable an OSS interrupt
	199	*
	200	* Same as above except we set the source's interrupt level to zero,
	201	* to disable the interrupt.
	202	*/
	203
	204	void oss_irq_disable(int irq) {
	205	#ifdef DEBUG_IRQUSE
	206	printk("oss_irq_disable(%d)\n", irq);
	207	#endif
	208	switch(irq) {
80614e5a	209	case IRQ_MAC_SCC:
1da177e4 LT	210	oss->irq_level[OSS_IOPSCC] = OSS_IRQLEV_DISABLED;
	211	break;
	212	case IRQ_MAC_ADB:
	213	oss->irq_level[OSS_IOPISM] = OSS_IRQLEV_DISABLED;
	214	break;
	215	case IRQ_MAC_SCSI:
	216	oss->irq_level[OSS_SCSI] = OSS_IRQLEV_DISABLED;
	217	break;
	218	case IRQ_NUBUS_9:
	219	case IRQ_NUBUS_A:
	220	case IRQ_NUBUS_B:
	221	case IRQ_NUBUS_C:
	222	case IRQ_NUBUS_D:
	223	case IRQ_NUBUS_E:
	224	irq -= NUBUS_SOURCE_BASE;
	225	oss->irq_level[irq] = OSS_IRQLEV_DISABLED;
	226	break;
	227	#ifdef DEBUG_IRQUSE
	228	default:
f85e7cdc	229	printk("%s unknown irq %d\n", __func__, irq);
1da177e4 LT	230	break;
	231	#endif
	232	}
	233	}
	234
	235	/*
	236	* Clear an OSS interrupt
	237	*
	238	* Not sure if this works or not but it's the only method I could
	239	* think of based on the contents of the mac_oss structure.
	240	*/
	241
	242	void oss_irq_clear(int irq) {
	243	/* FIXME: how to do this on OSS? */
	244	switch(irq) {
80614e5a	245	case IRQ_MAC_SCC:
1da177e4 LT	246	oss->irq_pending &= ~OSS_IP_IOPSCC;
	247	break;
	248	case IRQ_MAC_ADB:
	249	oss->irq_pending &= ~OSS_IP_IOPISM;
	250	break;
	251	case IRQ_MAC_SCSI:
	252	oss->irq_pending &= ~OSS_IP_SCSI;
	253	break;
	254	case IRQ_NUBUS_9:
	255	case IRQ_NUBUS_A:
	256	case IRQ_NUBUS_B:
	257	case IRQ_NUBUS_C:
	258	case IRQ_NUBUS_D:
	259	case IRQ_NUBUS_E:
	260	irq -= NUBUS_SOURCE_BASE;
	261	oss->irq_pending &= ~(1 << irq);
	262	break;
	263	}
	264	}
	265
	266	/*
	267	* Check to see if a specific OSS interrupt is pending
	268	*/
	269
	270	int oss_irq_pending(int irq)
	271	{
	272	switch(irq) {
80614e5a	273	case IRQ_MAC_SCC:
1da177e4 LT	274	return oss->irq_pending & OSS_IP_IOPSCC;
	275	break;
	276	case IRQ_MAC_ADB:
	277	return oss->irq_pending & OSS_IP_IOPISM;
	278	break;
	279	case IRQ_MAC_SCSI:
	280	return oss->irq_pending & OSS_IP_SCSI;
	281	break;
	282	case IRQ_NUBUS_9:
	283	case IRQ_NUBUS_A:
	284	case IRQ_NUBUS_B:
	285	case IRQ_NUBUS_C:
	286	case IRQ_NUBUS_D:
	287	case IRQ_NUBUS_E:
	288	irq -= NUBUS_SOURCE_BASE;
	289	return oss->irq_pending & (1 << irq);
	290	break;
	291	}
	292	return 0;
	293	}